A touch drive circuit and a driving method therefor, an array substrate and a touch display apparatus relate to a field of display. The driving method includes: during touch scanning time period in one frame, by each of output control unit (2), receiving a touch enable signal, a common voltage signal and a touch scanning signal, and receiving an output signal of an shift register unit connected with the output control unit; and outputting, by each of the output control units, the touch scanning signal to a touch drive electrode connected with the touch control unit in a first time period according to the touch enable signal and the output signal of the shift register unit connected with the output control unit, wherein the first time period is scanning time allocated to the touch drive electrode in one frame of time.

An OLED touch display panel capable of detecting and reacting to touches on the display includes a signal sending element emitting ultrasonic signals, a driving layer configured to provide display driving signals, a light-emitting element configured to receive the display driving signals and emit light, and a signal receiving element configured for receiving reflected ultrasonic signals. The light-emitting element includes a plurality of light-emitting units and a plurality of black matrixes. Every two adjacent light-emitting units are separated from each other by one of the black matrixes. The signal receiving element includes a plurality of thin film transistor units arranged in a matrix. Each thin film transistor unit is formed on one of the black matrixes.

A level-shift circuit that operates stably is provided. The level-shift circuit has a function of boosting a first signal having an amplitude voltage between a first voltage and a second voltage to a second signal having an amplitude voltage between a third voltage and the second voltage. The level-shift circuit includes first to eighth transistors. Gates of the third and seventh transistors are electrically connected to a wiring for transmitting a third signal for controlling the amounts of current flowing into one of a source and a drain of the first transistor, one of a source and a drain of the second transistor, one of a source and a drain of the fifth transistor, and one of a source and a drain of the sixth transistor.

A virtual reality display device that can include a first pixel array and a second pixel array. Pixels of the pixel arrays can have a response time that is less than 2 msec, where the response time for a pixel is a sum of a first amount of time for brightness of the pixel to rise from 10% of white luminance to 90% of white luminance and a second amount of time for response time to fall from 90% of white luminance to 10% of white luminance. Additionally, the first pixel array can be separated from the second pixel array by a gap, and a distance from a center of the first pixel array to a center of the second pixel array is between 58 mm to 72 mm.

A method for inputting a text and a display apparatus using the same are provided, the text input method including: transferring a message for requesting execution of a text input mode to an external device; receiving the text from the external device; and displaying the received text if it is determined that a situation in which a text is to be input occurs. Therefore, if a situation in which a text is to be input occurs, an external device automatically operates in a text input mode, and thus a user more conveniently inputs the text.

Herein is disclosed a positional content platform and related systems and methods. According to some embodiments, the platform includes a mobile processing and communication device and a service layer executing on a server. The mobile processing and communication device communicates with the service layer. By virtue of the communication, a user of the mobile device is able to locate and view digital content that has been created and stored on the platform. The aforementioned content is associated with a geographic location, and, according to some embodiments, the content is represented in a user interface by an icon that is superimposed over a field of view representative of a geographic region.

A bridge for a conveyor system includes a bridge frame including a top support surface segment having a top support surface. The bridge frame further has first and second side walls extending downwardly away from the top support surface segment. Each side wall has a portion thereof with a radius of curvature substantially matching a corresponding conveyor roller. A portion of the first side wall extends toward and joins the second side wall, the second side wall further having a tail portion and a living hinge extending away from the tail portion.

The application relates to freight loading systems for transporting freight items. Corresponding freight loading system comprises a freight deck having a plurality of freight handling devices, a control device which is communicatively connected to the freight handling devices in order to handle at least one freight item on the freight deck, and a remote control, which is communicatively connected to the control device in order to output control signals to the control device. The control device is intended to comprise a position determination unit for determining a remote control position on the freight deck and/or the orientation of the remote control, wherein the control unit is designed to select a number of freight handling devices and drive same depending on the control signals received and the remote control position and/or orientation of the remote control. This allows easier control of the freight items on the freight deck.

A hygienic drive system for a belt conveyor. The drive system has a stator rigidly mounted in a housing having an outer bearing surface that is continuous with the outer surface of mounting supports and avoids hard-to-clean nooks. A rotor assembly formed by drive wheels rotatably mounted on the outer surface of the housing or by a magnetic belt wrapped around a portion of the outer surface is rotated by a rotating magnetic wave produced by the stator. The stator and rotor can form an induction motor or a synchronous motor.

Coin processing apparatuses, such as consumer or commercial coin processing apparatuses for counting and/or sorting coins, are described herein. The apparatuses can include coin conveyors having a plurality of individual coin carriers linked together to form a chain. In some embodiments, each of the coin carriers includes a corresponding pocket that is configured to receive a coin from a coin hopper as the carrier chain passes through the coin hopper during its cycle. The coin carriers can carry the coins past one or more sensors for identification or “discrimination” of the coin denomination. After discrimination, the coins can be knocked from the carrier pockets and into, e.g., a selected coin chute for transfer to a collection bin.

Systems, computer program products, and methods useful for handling or managing microplates are provided.

A unit for transferring and up-ending at least one sealed package containing a pourable food product and having a first axis, comprising: at least one push member which cooperates with package to feed it along a first path from an in-feed station to an out-feed station; the path extending about a second axis; the unit further comprising a guide cooperating with a first side of package along first path to up-end it from an in-feed position, in which it is positioned with first axis oriented in a first direction, to an out-feed position, in which it is positioned with first axis oriented in a second direction crosswise to first direction; and an anti-rotating mechanism cooperating with package along path to prevent package from rotating about first axis; an anti-rotating mechanism comprising a pressure element rotatable about second axis and adapted to cooperate, in use, with package.

A buffer section for a conveying system in a high rack warehouse comprises a slide rod inclined relative to the horizontal for sliding conveyance along a conveying path in a conveying direction, which is parallel to a slide rod longitudinal axis, of a plurality of suspended conveyed goods, which are in each case suspended by means of a hook on the slide rod, and a stopper element in the conveying path at the end of at least one portion of the slide rod to stop the conveyed goods with the formation of a group of conveyed goods, wherein the stopper element has a contact face, which can be displaced between a stopper arrangement to stop the conveyed goods and a passing arrangement for allowing the conveyed goods through, for the conveyed goods, and wherein exclusively the stopper element is used to stop the conveyed goods.

A transport device includes a traveling holding member which can travel while holding a storage container, and a move out prevention mechanism which prevents substrates from moving out of an opening of the storage container. The move out prevention mechanism is configured to include a contacting member which can be moved between a contact position at which the contacting member is in contact with side faces of the substrates, and a spaced apart position at which the contacting member is spaced apart from the side faces of the substrates. The contact position is set such that the contacting member is located between an opening side end portion and a central portion of the substrates in a direction along which the substrates are inserted and removed.

A transfer modules arrangement (100) for an articles conveyor (110). The transfer modules arrangement includes at least one transfer module (125) in turn comprising a frame (310) housing a plurality of idle rollers (135) for allowing an inertial run of transported articles (140) between consecutive conveyor belt/chain elements (115a, 115b) of the articles conveyor. According to the invention, the transfer modules arrangement includes at least one positioning rod (120). Additionally, the frame of the at least one transfer module further includes a shaped cavity (315) for allowing a sliding insertion of the at least one transfer module on the at least one positioning rod.

“CONVEYOR SYSTEM WITH DIFFERENT APPLICATIONS AND ISOLATION OF THE CONVEYED PRODUCT IN RELATION TO THE DRIVE SYSTEM”, is a conveyor for grains, seeds, fruit, granulated and ground products and similar products. The conveyor has different applications and isolates the product conveyed from the drive system. There are two or more tubes, and in each set of tubes there is a swivel with a drive system using roller chain, chain, cable, belt, et cetera. In this manner, the drive system is isolated from the product, avoiding mechanical damages, contamination, and also increasing the performance of the system.

A device for changing a pallet car in a plant for the treatment of bulk materials where pallet cars that are continuously conveyed using a lifting wheel and a lowering wheel on an outer rail and an inner rail in an endless chain includes, in regions of a bottom and top strand of the lifting wheel, first and second outer curve links of the outer rail that are openable such that the pallet car is removable from the chain and another pallet car is insertable into the chain. A removal switch is disposed in the region of the bottom strand of the lifting wheel, via which the pallet car is movable out from the chain, and a supply switch is disposed in the region of the top strand of the lifting wheel, via which the pallet car is insertable into the chain.

A center loading assembly for a conveyor belt having a carriage support attached to a belt conveyor main frame and having a carriage within the carriage support. The carriage has a center member with side members extending at an angle therefrom, each having an upward extension. The upward extensions have side rollers and conveyor belt covering skirts and keep the conveyor belt centered between the conveyor belt covering skirts. The carriage support has vertical bearings to support the carriage and side bearings to hold the carriage on the vertical bearings. The carriage and conveyor belt covering skirts follow a trough angle of the conveyor belt as the conveyor belt shifts. Material deposited onto the conveyor belt is deflected to the center portion of the conveyor belt by the conveyor belt covering skirts.

This distributing device for absorbent articles is provided with a main conveyor path, a branch conveyor path that branches from the main conveyor path, a main conveyor path that conveys absorbent articles along the main conveyor path, a diverting mechanism that diverts absorbent articles in the main conveyor path from the main conveyor path to the branch conveyor path, and a branch conveyor mechanism that conveys the absorbent articles diverted by the diverting mechanism along the branch conveyor path. The diverting mechanism is provided with a diverting part for diverting the absorbent articles. The diverting part moves without stopping, entering the main conveyor path from a standby position outside the main conveyor path and then, after leaving the main conveyor path, returning to the standby position.

A specimen transport apparatus according to an aspect is provided with a holder which holds a cup-like specimen container accommodating a specimen in an upright position, a chain member disposed along a predetermined transport path, and a supporting portion provided in a predetermined position on the chain member and configured to support the holder.

A method and apparatus for preparing a cellulosic feedstock are disclosed. Embodiments of the method comprise passing the cellulosic feedstock out of at least one outlet of a vessel (such as a holding tank) and obtaining at least two streams of cellulosic feedstock wherein each stream may be fed different hydrolysis reactors. Embodiments of the apparatus comprise passing the cellulosic feedstock downwardly through the vessel and withdrawing the feedstock from the vessel in two different lateral directions.

A belt tracking system for adjusting displacement of a movable belt in an axial direction of a plurality of rollers about which the movable belt is entrained includes a slope member and a roller shaft support. The slope member is disposed at least at one end of at least one of the plurality of rollers in the axial direction, to tilt the roller due to movement of the belt. The roller shaft support rotates about a predetermined shaft and includes a shaft recovery member to recover a tilt of the slope member. The shaft recovery member is disposed within a shortest circumference of a closed curve among closed curves within which the slope member and the roller shaft support are disposed in a state in which the roller shaft support is rotated.

An alignment system for a conveyor having a conveyor belt trained over rollers on a conveyor frame where the system includes a support bracket including a center support and pivoting members each including a torque arm, the pivoting members being pivotally mounted to opposing ends of the support bracket. Two tracking rollers are independently mounted to the support bracket, where each of the tracking rollers includes a shaft with an inner end and an outer end, the outer ends of the shafts being coupled to the pivoting members and the inner ends being coupled to the center support such that pivoting movement of the pivoting members causes the tracking rollers to pivot relative to the center support. A guide control bar having two ends is pivotally connected at each the end to a corresponding torque arm connected to the corresponding pivoting member, where the guide control bar includes guide rollers positioned at both edges of the conveyor belt for lateral control of the belt.

A tensioning assembly for a cable drag conveyor. The conveyor includes a head pulley mounted on a head pulley shaft positioned in a head pulley housing and a tail pulley mounted on a tail pulley shaft positioned in a tail pulley housing, infeed and discharge conveyor tubes interconnecting the head pulley housing and the tail pulley housing, and an endless rope having conveying disks attached to the rope positioned in the infeed and discharge conveyor tubes and around the head pulley and tail pulley. The tail pulley housing is positioned in a stationary position in relation to the head pulley and the head pulley housing. The tail pulley shaft and tail pulley is positioned on the tail pulley housing for movement in relation to the tail pulley housing, the head pulley and the head pulley housing. A tensioner moves the tail pulley to maintain the tail pulley at a distance in relation to the head pulley that results in correct tension on the rope during its travel through the cable drag conveyor.

A conveyor belt having opposing ends to be connected for endlessing the conveyor belt. The belt includes a belt member, and two planar connector parts provided one at each said end of the belt. Each connector part has, at an edge of the connector part, an edge coil extending over the width of the belt. The belt is configured to be endlessed by bringing the edge coils of the first and second end into a sideways engagement to obtain an overlapping coil area and by inserting a closing wire through the overlapping coil area. Each connector part has a set of splice fingers engaging in correspondingly shaped finger recesses formed in the belt member.

Rod belt for rod belt conveyors for agricultural machinery includes rods arranged transversely with respect to the running direction and parallel to one another. At least one of the rods has flattened and perforated end areas with which it rests on tensile stress-resistant, elastic, continuous belts which revolve in parallel to one another, and is connected by rivets or similar fastening elements which pass through the end areas and the belts. The rod belt may be produced with a rod division that differs from, and in particular is smaller than, the division of the fastening points on the belts. This is achieved by providing that at least one additional rod is fixedly connected to the at least one rod which is connected to the belts, and the at least one additional rod is free of contact with the belts.

Rod belt for rod belt conveyors for agricultural machinery, having rods arranged transversely with respect to the running direction and parallel to one another. Rods at their ends are each connected to a fastening piece which has a flattened and perforated support area with which fastening piece rests on tensile stress-resistant, elastic, continuous belts extending in parallel and is connected by rivets or similar fastening elements which pass through support area and belts, and support area is formed in one piece with a fastening area for rod ends. The rod belt includes fastening pieces which have a simple design and are cost-effectively manufactured. Fastening pieces are designed as bends having a fastening area which, in relation to the installed position, is bent from the plane of support area toward the bottom side of belt and situated parallel to the inner side of belt.

A chain link of a conveying chain, containing a base body with a first end region which comprises a first coupling section for the articulated connection to a coupling section of a first adjacent chain link, and with a second end region which comprises a second coupling section for the articulated connection to a coupling section of a second adjacent chain link. The base body comprises an intermediate region lying between the two end regions and includes a body section with bending-elastic characteristics, which is designed such that the first end region is elastically bendable relative to the second end region out of the longitudinal direction of the base body.

Sterilization and cleaning of an escalator hand rail are performed. A sterilization and cleaning device including a hand rail; a plasma source for irradiating the hand rails with ions or radicals or UV light; an enclosure for housing the plasma source; a power source for generating plasma; a fan for generating relatively negative pressure in the enclosure; filter units for removing removed bacteria, viruses, and organic matters such as hand marks; and filter plates located backward and forward of a moving direction of the hand rail in the enclosure along the hand rail is provided.

Machine (1) for packaging articles (2) inside containers (3), a conveyor (6) is provided with a longitudinally movable transporting section (7) for feeding the articles (2) in a given direction (D) and along a given conveying path (P); a robot (23), which is arranged along the conveying path (P) and controlled by an operating and control device depending on detection at least of the position of each article (2) on the transporting section (7), picks up single articles (2) from the transporting section (7) and transfers each picked-up article (2) inside a container (3); the transporting section (7) is delimited transversely by two side walls (18) stabilizing the position and direction of each article (2) with respect to the transporting section (7); on the latter the articles (2) are stably seated between the side walls (18), one behind another in a row, in the conveying direction (D).

The present invention provides a truss device for an escalator or moving walk comprising an outer panel and an inner panel facing the outer panel, characterized in that, the inner panel is formed from a single integral panel and comprises a body part and a plurality of connection parts extending from the body part toward the outer panel thus forming corresponding through openings in the inner panel, each connection part is connected to the outer panel so that the outer panel and the inner panel are fixed together, wherein the inner panel further comprises a support part formed on the body part of the inner panel and projecting in a direction away from the outer panel. The present invention also provides an escalator or moving walk having the above truss device.

A method for storing and transporting products in a low-pressure storage device and a low-pressure storage device therefore, to allow product storage in a simple manner, and to control the storage in a simple manner. The products transfer on a first storage path and on a second storage path that is arranged directly next to the first storage path, during the storage operation of the storage device.

An egg chain gripper actuating device for use with an egg transfer device. The device has an egg conveyor with parallel egg chains movable in a transport direction, each chain supporting egg grippers, which can be individually actuated. The device further comprises an egg receiving unit with a receiving area for receiving eggs released by the egg grippers, and one group of one or more actuators for each egg chain for selectively actuating passing egg grippers. Multiple support frames are provided, each supporting one or more groups of actuators. At least one frame is adjustable parallel to the transport direction and relative to another frame, such that the position of the actuators of the one or more groups supported by the frame can be adjusted relative to the position of the one of more actuators of the one or more groups supported by the other frame.

A device for transporting vehicle bodies, on which standardized holding components are provided. A guide device is provided for at least one continuous drive train which having a driving side and a slack side, and having a first return element and at least one second return element around which the at least one continuous drive train circulates. The at least one continuous drive train supports a plurality of coupling elements which are arranged and aligned in such a manner that they can work together with the standardized holding components provided on the vehicle body.

An article sorting and conveying device that conveys articles by the vibrations of a movable body provided through an elastic support unit, includes a first vibration unit that imparts a periodic vibration force to the movable body in a direction inclined from a vertical direction; a second vibration unit that imparts a periodic vibration force in a direction crossing the periodic vibration force by the first vibration unit; and a vibration control unit that causes a periodic vibration force imparted by each vibration unit to have a phase difference and occur simultaneously at the same frequency, and that creates an elliptical vibration trajectory in the movable body. The articles are sorted and conveyed on the movable body by setting the vibration trajectory of the movable body by the vibration control unit such that articles having a different coefficient of friction are conveyed in different directions.

A medicine counting device including a rotary container broadening radially in an upward direction and configured to rotate around an axis of the rotary container; a guide member fixed with a predetermined gap on a top surface side of the rotary container, spirally extending from the central portion towards an outer circumference of the rotary container, and configured to guide a medicine moved by a rotation of the rotary container from the central portion towards the outer circumference of the rotary container. The medicine counting device further includes a detector provided outside of the rotary container and a regulator configured to feed a medicine having been moved to the outer circumference and being in contact with the guide member towards the detector but returns the medicines which are not being in contact with the guide member to the central portion side of the rotary container by overpassing the guide member.

In some embodiments, apparatus useful for assisting in controlling the discharge of material onto a conveyor from a material dispenser includes a carrier, first and second side restrictors extending downwardly from the carrier and at least one wiper extending downwardly from the carrier and transverse to the side restrictors. The side restrictors are configured to assist in preventing at least some material from overflowing off the sides of the conveyor, while the wiper is configured to level the top of at least some of the material dispensed on the conveyor.

A door transportation method in a vehicle body assembly line, in which the vehicle body is placed and transported on a vehicle body transportation carriage of a floor conveyer, and thereby components are assembled to the vehicle body, includes: placing and transporting the door, which is detached from the vehicle body, on a door placing section arranged on a base stand of the vehicle body transportation carriage.

Extendable conveyors with lights are disclosed herein. An example extendable conveyor disclosed herein includes a base unit and a mechanically extendable section, which is adjustably positionable between a nested position within the base unit and an extended position telescoped forwardly from the base unit. The conveyor includes a conveying surface to convey articles extending at least partially on an upper side of the mechanically extendable section. A light source is positioned at a lower side of the mechanically extendable section to illuminate at least an area below the mechanically extendable section.

In a method for manufacturing an element (8) of a modular scaffolding system, an at least partly galvanized pipe part (10) having a first end (12) and a second end is provided, together with an at least partly galvanized first connection head (40) which is designed to be connected to the first end (12) of the pipe part (10). A weld (24), which connects the first end (12) of the pipe part (10) to the first connection head (40), has an internal weld surface (24b) and an external weld surface (24a). The internal weld surface is proximal to the pipe part (10) and/or the connection head (40), and the external weld surface is proximal to an outside environment (60) of the pipe part (10) and the connecting head (40). A protective layer covers the external weld surface, such that it is screened off from the outside environment (60).

A system is provided with a controller and a device configured to receive and output network data from a communication network to the controller. Accordingly, the controller is configured to (i) receive the network data from the device, (ii) conduct heuristic analysis on the network data, (iii) identify at least a portion of the network data as suspicious upon determining by the heuristic analysis of a likelihood that at least the portion of the network data including malware, (iv) simulate transmission of the suspicious network data to at least one virtual machine of a plurality of virtual machines that is selected or configured using at least one software profile, and (v) analyze effects of the suspicious network data on the at least one virtual machine.

A portable folding support structure for safely tethering an individual comprises a portable cart sized to fit through a residential doorway, having wheels and a motor that actuates at least one of the wheels. A hand-operated throttle and steering device control the cart. The cart comprises an extendable anchoring plate to prevent rolling. A substantially horizontal jib with the cart comprises a harness point for receiving a safety cable to which an individual is attached to allow safe cleaning practices and to minimize fall risk. A foldable outrigger provides stability to the cart and an anchoring pad attaches to a distal region of the outrigger to promote stability. A textile liquid-absorbing surface is positionable about an outer surface of a glass balcony to inhibit cleaning liquids from spilling below the level of the liquid-absorbing surface.

A mobile platform has a separate and independent linear actuator pivotally connected near each opposite end of the platform where there is a contact limit switch that when triggered by contact with the side of a flatbed, stops movement of the actuator, and thus stops movement of the platform, toward the side of the flatbed. Because each of the two actuators is pivotally connected to its respective end of the platform and moves independently of the other, each end of the platform can stop moving toward the flatbed before or after, depending on how the flatbed is misaligned, the other end of the platform stops moving toward the flatbed. In this way the platform self-aligns to the alignment of the flatbed and avoids the need to reposition a flatbed that is not precisely aligned parallel to the central axis of the loading bay.

An apparatus for facilitating the storage of equipment such as ladders in the upper area, but particularly in the upper area on the outside of emergency vehicles such as trucks which includes a capability of moving the ladder to an extended lower deployed position to facilitate immediate access thereto by emergency workers such as firemen. An outer bracket is connected to an inner housing through a parallel linkage with the inner housing attached to the vehicle and the outer bracket attachable to the equipment. The outer bracket includes a downwardly extendable sliding carriage to facilitate positioning of the equipment at a lower level for aiding in retrieval thereof utilizing a flexible control arm.

Fall protection systems, methods of installing such systems, and buildings embodying such systems. Such fall protection system extends from structure elements of the building about an encompassed space into which there is risk of a person falling. An open-mesh web is supported from the structure elements and overlies, and extends across, the space. A perimeter band extends about the encompassed space. The perimeter band is secured to the building structure elements about the space and thus entraps the web between the band and the building structure elements. The web may also be supported in the space by supplemental supports, which can be crossing support bands, attached to the structure elements, or intervening e.g. walls within the space. The web is left in place and is covered by internal finish materials whereby the web is captured between internal finish materials and ceiling and/or floor members in the finished building.

A mechanic's leaning device includes a base, an upper torso support having an adjustable first height above the base, and a combination step and knee support having an adjustable second height above the base which is less than and adjustable relative to the first height. The mechanic's leaning device can be used by mechanics of all sizes for working on a wide variety of vehicles, ranging from very small to very large.

Tree stands are disclosed for providing an elevated standing location. The tree stand can include a support post, a seat rotatably coupled to the first end of the support post, and a platform rotatably coupled to the second end of the support post. The platform can rotate from a transport configuration to an operable configuration. The platform in the operable configuration is approximately perpendicular to the support post. The platform has a tree contact point positioned above a plane of the platform when the platform is in the horizontal position. The platform can comprise a plurality of hexagons with groups of three hexagons intersecting at a point and forming a honeycomb pattern defining a top standing surface on which a hunter can stand. The contact point is configured to create an over-center locking action. The tree stand can also include a stackable ladder coupled to the platform.

The present invention relates to playground equipment and, more particularly, to a playground apparatus incorporating modular construction, which permits rapid simplified assembly, modification and universal arrangement of playground equipment modules without tools.

Aspects of the invention relate to a roof comprising at least an inclined surface and a rim marking a transition to another surface extending horizontally or at a different inclination, the inclined surface and the rim being covered by roof elements. The roof further comprising at least one anchor for attaching an anchor rope to. The anchor is secured to the roof beneath the roof element or elements covering the rim and the roof elements covering the rim are spaced apart from the roof elements covering the inclined surface so as to allow access to the anchor from outside the roof.

The present invention relates to fall protection systems to which a scaffolder can tie off during scaffold construction by adjusting the height of the lifeline and to move along the entire length of a scaffold level without having to disengage the lifeline. In one embodiment the fall protection system includes two vertical support members adapted to be affixed to a scaffold frame wherein the two vertical members have attachment means for attachment of a lifeline, and wherein the attachment means are located at each respective vertical member and configured for movable attachment at a plurality of positions along the vertical axis of each support members. In addition the present invention relates to methods to use the fall protection system during scaffold construction.