A planetary roller gear drive with a spindle nut (1) that is arranged on a threaded spindle (2) and with planets (3) that are arranged distributed around the periphery and are in rolling engagement with the spindle nut (1) and the threaded spindle (2). The planets (3) revolve on planetary orbits (P) that are arranged perpendicular to the spindle axis and the planets (3) are each divided into multiple planet parts arranged one behind the other in the axial direction.

A dual stage accelerator pedal assembly is provided that is capable of communicating various vehicle operating conditions to the driver as well as notifying the driver of a critical operating condition, such as a low battery pack level, via a change in pedal resistance. The change in pedal resistance is achieved by preloading one of the springs in the accelerator pedal's spring assembly. The spring assembly uses two springs exhibiting different spring force to achieve distinguishable first and second pedal stroke stages.

An apparatus for locating a central axis of a spinal column and method of using the same is disclosed. The apparatus and method includes one or more members capable of spanning a center line which may then be identified by at least one additional member positioned therebetween. Furthermore, the device may contain or be capable of accommodating various additional tools for marking the location of the central axis of a spinal column.

A portable articulated arm coordinate measurement machine can include a base, a manually positionable articulated arm portion having opposed first and second ends, the arm portion including a plurality of connected arm segments, an electronic circuit that receives the position signals from the transducers, a first inclinometer coupled to the base, wherein the inclinometer is configured to produce a first electrical signal responsive to an angle of tilt of the base and an electrical system configured to record a first reading of the first inclinometer and a second reading of the first inclinometer, wherein the first reading is in response to at least one of a first force applied to the base and a third force applied to the mounting structure, wherein the second reading is in response to at least one of a second force applied to the base and a fourth force applied to the mounting structure.

A probe deployment mechanism of a coordinate measuring machine provides for extending and retracting a probe. The probe is displaceable with respect to the actuator body connected to the measuring machine. A locator coupling secures the probe to the actuator body at the extended position for taking measurements. A drive coupled to the probe displaces the probe between the extended and retracted positions but at the extended position, the drive is releasable from the probe for kinetically isolating the locator coupling.

A periodic permanent magnet (PPM) klystron has beam transport structures and RF cavity structures, each of which has permanent magnets placed substantially equidistant from a beam tunnel formed about the central axis, and which are also outside the extent of a cooling chamber. The RF cavity sections also have permanent magnets which are placed substantially equidistant from the beam tunnel, but which include an RF cavity coupling to the beam tunnel for enhancement of RF carried by an electron beam in the beam tunnel.

A frame assembly for simulating topography of an existing wall portion provides points of adjustment behind a wallboard panel mounted to the frame assembly. In this manner imperfections in an existing wall can be replicated to facilitate cabinet or countertop installation.

An inclination angle compensation system for determining an inclination angle of a machine is disclosed. The inclination angle compensation system may have a non-gravitational acceleration estimator configured to estimate a non-gravitational acceleration of a machine based on an estimated inclination angle and an acceleration output from a forward acceleration sensor. The inclination angle compensation system may also have an inclination angle sensor corrector configured to receive an inclination angle output from an inclination angle sensor, determine an inclination angle sensor acceleration based on the inclination angle output, and calculate a corrected inclination angle of the machine based on the non-gravitational acceleration and the inclination angle sensor acceleration.

Systems and methods for sailboat mast alignment are provided. In some embodiments, a system for alignment of a sailboat mast comprises a mounting bracket configured for attachment to the mast, and one or more lasers pivotally connected to the mounting bracket to enable the one or more lasers to be positioned at an index angle relative to the mast on both sides of the mast.

The invention relates to an autonomous system for determining items of information representative of the movement of an articulated chain (CA—1, CA—2, CA—3) comprising at least two solid elements (ES1—1, ES2—1, ES1—2, ES2—2, ES3—2, ES1—3, ES2—3, ES3—3, ES4—3) and at least one articulation (ART1—1, ART1—2, ART2—2, ART1—3, ART2—3, ART3—3) connecting said two elements. The system comprises at least two devices (DISP1—1, DISP2—1, DISP1—2, DISP2—2, DISP3—2, DISP1—3, DISP2—3, DISP3—3, DISP4—3) for measuring inter-device distances, mounted fixedly on two distinct elements of said articulated chain and suitable for transmitting the measurements made. Moreover, the system comprises means for determining at least one distance separating two measuring devices based on at least one measurement supplied by a measuring device, and calculation means (CALC), mounted on said articulated chain, suitable for calculating items of information representative of the movement of said articulated chain based on the measurements transmitted by said devices for measuring inter-device distances.

A test device for testing concentricity between first and second holes in parallel plates includes a positioning pole and a test pole. The positioning pole includes a head segment having a tapered positioning portion. The positioning pole axially defines a through hole. The test pole is telescopically received in the through hole of the positioning pole. The test pole includes a test head with a diameter slightly less than a diameter of the second hole. The positioning portion of the positioning pole extends into the first hole with the conic section of the positioning portion abutting against an inner wall bounding the first hole. The test head of the test pole faces the second plate and approaches and confirms the concentricity of the hole in the second plate by sliding the test pole relative to the positioning pole.

An apparatus for measuring dimensions of a micro-scale object includes a movable stylus, a probe and at least one acoustic emissions sensor. The movable stylus is positionable to contact an object to be measured. The probe is rotatably coupled to the stylus and has a distal end that circumscribes a circle when rotated. The acoustic emissions sensor is operatively coupled to the probe. The sensor is operative to detect acoustic emissions generated from contact between the distal end of the probe and the object, thereby allowing dimensions of the object to be determined.

The slide operation-type dovetail groove sliding stage may include a sliding lock screw for locking sliding of a sliding component, by causing the screw to abut on an inverted triangle-shaped protrusion, provided on a sidewall of a sliding component approximately parallel to a sliding direction and coupled to the sliding component, to bring the protrusion into contact with a dovetail of the fixed component and by tightening the screw. The sliding lock screw may be used as a sliding adjustment screw for performing fine adjustment of a degree of sliding of the sliding component with respect to the fixed component by adjusting an amount of rotation of the screw which abuts on the protrusion to bring it into contact with the dovetail of the sliding component, and a driving means which an operator grasps to perform an operation of sliding the sliding component to a desired position.

A system is invented to combine different signals from various sensors together so that an object (such as a car, an airplane etc.)'s position and/or orientation can be measured.

A measuring assembly for measuring an inside of a lens frame of a spectacle frame, said lens frame at least partially delimiting an inscribed surface area F that corresponds to a lens shape, comprising a holding device for mounting the spectacle frame, at least one light source for generating a light beam to be projected on a region of the lens frame to be evaluated, and at least one sensor that can be coupled to an evaluation unit for detecting the reflected light beam, wherein the holding device can be rotated about a rotational axis r and moved in the direction of a movement axis x, and the movement axis x comprises at least one movement component in a direction perpendicular to the rotational axis r. The holding device is used to fix the spectacle frame by spectacle frame bows, wherein at least one free space is provided in the region of the holding device, said free space being used to receive the spectacle frame bows of a spectacle frame to be held which are not folded in or cannot be folded in.

A device and method for inspecting a width of thread roots of a tubular component for exploration or working of hydrocarbon wells, the device including two arms each including a first and a second end, the first ends being connected together by a deformable portion allowing an angular displacement between the second ends, the second ends each carrying a contact element and a mechanism determining the angular displacement.

A portable device is used to aid a semi-truck driver in the repositioning of a tandem axle assembly of a trailer. The portable device may be easily attached and removed from the trailer's sub-frame during operation. The device will signal the driver visually when reaching the desired position during adjustment of the tandem axle assembly to a new location. The device may reduce time and increase safety for the driver during the tandem axle assembly repositioning operation. The device may be positioned at or near the desired tandem axle assembly position. A flap may pivotally hang in a position where a tire from the tandem axle assembly may deflect and pivot the flap when the tandem axle assembly reaches its desired position. A driver may see this flap deflection and know, with certainty, that they have achieved the desired tandem axle assembly position.

A physiological measurement device or wearable device simulator includes a frame and a plurality of surfaces distributed within the frame. For each surface, a surface actuator links the surface of the frame. At least one of: i) force or position imparted by the surface on a physiological feature of a subject by the surface actuator; and ii) the force imparted by the physiological feature of the subject on the surface, can be employed to modulate the positions of the surfaces relative to each other independently of the forces imparted by or on those surfaces, thereby measuring the physiological feature of the subject or simulating a wearable device interface.

A system and method for inspection and quality control for goods determines whether the goods comply with desired configurations. In an embodiment, an inspection and quality control system for a good includes a template. The template includes a template body and a positive offset. The positive offset includes a maximum length of the good and a maximum width of the good. The positive offset is configured for the good to be disposed in the positive offset when the good is less than the maximum length and the maximum width. The system also includes a negative inset. The negative inset includes a minimum length for the good and a minimum width for the good. The negative inset is configured to be disposed in the positive offset over the good disposed in the positive offset.

Disclosed is a rule assembly having a housing, a reel rotatably mounted in the housing, an elongated blade wound on the reel and extendable through an opening in the housing, and a permanent end hook member attached to the elongated blade with a first hook portion. The rule assembly further has another or second end hook member that is removably attachable to the elongated blade with a second hook portion. Each of the permanent end hook member and second end hook member are capable of limited movement relative to the blade between an extended position and a retracted position. The second hook portion can extend in a direction opposite to that of the first hook portion. A forward surface of the second hook portion can be aligned with a forward surface of the first hook portion to form a larger surface area for engagement with a workpiece.

A measurement gauge, comprising a pair of jaws biased in a closed position; a normalizing member surrounding one of the jaws when the pair of jaws is closed, the normalizing member biased in an extended position; a handle coupled to the pair of jaws and normalizing member such that movement from an extended handle position to an retracted handle position opens the pair of jaws and moves the normalizing member to an retracted position.

An instrument and method for determining the location of the anatomical epicondylar axis between the condyles of a femur is provided. The instrument includes first and second gauges each for measuring a radius of a femoral condyle and a frame. At least one of the gauges is movably connected to the frame. The method includes positioning the measuring end of each gauge against a separate condyle of a femur, actuating a pivoting member of each gauge to determine the radius of each condyle, measuring the distance between the condyles, and determining the location of the anatomical epicondylar axis of the femur. A measurement can be taken from a measuring scale provided on the gauge and from another scale provided on the frame. Determining the location of the axis can further include performing a calculation utilizing the radii of the condyles and the distance between the condyles.

A rugged hand-held mobile computing device for a forester to collect and use dendrometric data from trees and tree stands is claimed. The device includes a processor which operates in connection with a memory, a user interface, a GPS receiver, a sound sensor capable of emitting an ultra-sonic pulse and a computer readable code embodied on the memory. The device communicates with a transponder by way of the ultra-sonic pulse emitted by the sound sensor. The transponder also emits an ultra-sonic pulse back to device. The device calculates the distance traveled based on the knowledge of the speed of the pulses. The memory, which also includes basic mapping software, uses the data to update a map in real time with the location of the trees and other information collected.

Systems and methods for providing aircraft heading information are provided. In one embodiment, an attitude heading reference device comprises: at least one interface for receiving heading information from one or more IRUs; at least one set of gyroscopes and accelerometers; a memory device for storing data representing heading information received via the at least one interface; and a heading calculator coupled to the at least one interface, the at least one set of gyroscopes and accelerometers, and the memory device. The heading calculator generating a heading output signal based on heading information when reliable heading information is received over the at least one interface; the heading calculator generating the heading output signal based on data from the memory device regarding previously reliable heading information and an output of the at least one set of gyroscopes and accelerometers when reliable heading information is not received over the at least one interface.

A large bore measuring system includes a modular and extendable bore gage with analog and digital readouts, also includes a settable set-master. The modular bore gage is designed to measure two sets of large bore diameters. A first set of large bores is accomplished by using a modular bore gage design described in this disclosure. The second set of larger bores is accomplished by adding attachments therein extending the gage for the larger range of bore diameters. A set-master is used for both sets of large bores.

A disposable saliva ejector that utilizes a single planar, double leaf shaped plate design that is embossed on their inner faces with a series of arced ribs and folded about its midpoint. A tab and slot arrangement about the center of the plates, joins the two plates. The distal tips are held together by a dovetail arrangement on raised pads at the distal tips of each plate. The distal and proximal tips are also held in operational contact by the suction forces passed through the device. The arced ribs form a series of channels about perimeter of the device. A trough runs along the linear axis of both of the plates to direct any fluid and debris that is sucked into the channels into a connected suction tube. Placement of the saliva ejector within the mouth lies along the interior of the patient's cheek, keeping the oral cavity clear of viewing obstructions. The discharge end connects to a discharge tube, wrapping around the oral commissure then hooking onto the patient's outer cheek. Once properly placed within the patient's mouth the dental assistant is relieved from providing suction during various procedures.

An oral cavity suction system that incorporates a disposable saliva ejector residing along the interior of the patient's cheek that utilizes a single planar, double leaf shaped plate design that is embossed on their inner faces with a series of arced ribs and folded about its midpoint. The arced ribs form a series of channels about perimeter of the device that directs saliva into a trough running along the linear axis of both of the plates to direct this saliva into a connected “U” connector that hooks around the patient's cheek. A sterile suction tube is also connected on one end to the “U” connector suction tube and on its other end to a quick connect fitting that mates to a tube adapted with a fitting for connection to a high volume suction pump.

A method for applying a composition to teeth and a dispenser for dispensing a composition. The method of the present invention is directed to the storage and dispensing of a composition. During storage and subsequent use the composition in the storage chamber must be maintained segregated from the applicator surface. This is accomplished by delivering the composition from the storage chamber through a delivery channel having a length and a cross-sectional diameter sufficient to preclude the migration of moisture and the enzyme catalase from the application surface to the storage chamber. The composition is applied to teeth by means of bristles, a sponge surface or fibrillated surface. This applicator can be used with both aqueous and non-aqueous compositions.

A planning and guiding method and excavation guiding device correctly implant an artificial tooth root at a predetermined site, perform various excavation processes on a cortical bone section and a spongy bone section by stage-based guidance, and guide eccentric excavation of the cortical bone section and concentric excavation of the spongy bone section according to a bone pattern, such that the artificial tooth root thus implanted is not only positioned at a planned ideal site but also manifests appropriate initial stability.

An orthodontic apparatus for installation in a patient's mouth is disclosed. The orthodontic apparatus includes a first extension wire, a second extension wire, and a palatal archwire. Each of the first and second extension wires includes a proximal portion and a distal portion. The proximal and distal portions and the palatal archwire are manipulatable to apply corrective buccal, labial, and transverse forces on the patient's dento-alveolar complex (DAC), to correct the shape of the patient's palate.

A cement system for forming an implant comprises a reactive glass ionomer cement (GIC) powder, a polycarboxylic acid or salt, and a filler. The polycarboxylic acid or salt is included to initially provide a paste having a pH less than 7 when the cement system is mixed with water. In one embodiment, the filler is substantially inert when mixed with water and is selected from (CaO)(AI2O3)6, (CaO)(AI2O3)2, calcium silicate (CaOSiO2), and mixtures thereof. In another embodiment, the filler is substantially reactive when mixed with water and is selected from (CaO)2(SiO2), (CaO)3(SiO2), and mixtures thereof, and the cement system includes an additional acid to maintain the paste at a pH less than 7 for at least one hour after the cement system is mixed with water.

A dental implant two-piece fixture mount includes an implant fixture-mount base portion at its distal end, and a snap-on, separate, separable top piece at its proximal end, the top-piece including an insertion-tool-engaging surface and a distal cylindrical skirt with a plurality of protrusions on the skirt's inner surface, and a distal insertion projection, the fixture-mount base portion including a separable proximal portion that includes a groove near the bottom of the separable proximal portion for engagement with the protrusions, a longitudinal through passage to receive a fixation screw for attachment of the fixture mount base portion to a dental implant, and that includes an internal, multi-sided region to anti-rotationally engage the distal insertion projection.

A multi-layer coating of alternating titanium nitride (TiN) and titanium carbo nitride (TiCN) layers is applied to at least part of a dental device for use in attaching crowns, overdentures, and the like in a patient's jaw, where the outermost layer is TiCN with a predetermined percentage of carbon to produce a pink color. The pink outermost layer is of sufficient thickness to conceal the color of the underlying layers, and is very hard and resistant to wear and damage in use. At the same time, the outermost TiCN layer is of a color consistent with the gingival anatomy, and is very hard and resistant to wear and damage in use.

The present invention relates to oral and dental care and cleaning agents comprising an aqueous dispersion of a phosphate-containing and/or phosphonate-containing polyurethane polymer and anionic surfactant(s), to tooth cleaning methods using these agents, and to the use of oral and dental care and cleaning agents comprising an aqueous dispersion of a phosphate-containing and/or phosphonate-containing polyurethane polymer and anionic surfactant(s) to reduce the restaining of teeth and/or to reduce biofilm development on dental surfaces and/or to reduce the adhesion of bacteria to dental surfaces and/or to extend the antibacterial action of antibacterial substances.

The replacement of teeth using dental implants has always been done sequentially with the placement of the implant into a patient's bone followed by the creation of a prosthesis and subsequent insertion of the prosthesis. The process can take numerous visits and is done over a period of many months. This patent describes a method of using a digitally designed and created dental prosthesis as the drill guide to place the implants. Rather than the stent acting as a guide to place the implants, the drill guide itself comprises a stent encasing the final prosthesis. The final prosthesis—whose placement was digitally predetermined—is then secured with small-diameter implant screws, and the case is completed in one short visit.

Custom dental prosthesis or implants each individually designed and manufactured to replace nonfunctional natural teeth positioned in a jawbone of a specific pre-identified patient are provided. An example dental prosthesis/implant includes a dental implant body having a prosthesis interface formed therein to receive an occlusally-facing dental prosthesis component. The prosthesis interface has a custom three-dimensional surface shape positioned and formed to create a form locking fit with respect to the occlusally-facing dental prosthesis component when positioned thereon.

A method of analyzing a positional relationship between a dental restoration and a dental substructure. The method has steps of scanning a reference area and determining the shape of the dental substructure in its positional relationship to the reference area, and thereby providing a virtual dental substructure model and scanning the reference area along with scanning at least a portion of the dental restoration in fit position with the dental substructure to provide a virtual assembly model. The method further has the step of providing fitting quality information between the dental restoration model and the dental substructure model. The method utilizes superposing of further virtual models to provide the fitting quality information. The method facilitates the assessment of the quality of the fit between a dental restoration and a dental substructure.

Methods are provided for regulating tooth movement and for maintaining or improving tissue health using heavy forces. Such methods comprise allowing a heavy force to be exerted on one or more teeth of a patient in need thereof; and administering an effective amount of light to the maxillary or mandibular alveolar bone of the patient, wherein the light is administered before, during, or after the heavy force is exerted. The light can have a wavelength in the range of about 585 nm to about 665 nm, or about 815 nm to about 895 nm. An apparatus useful for providing light therapy is also provided.

A dental implant assembly includes an implant, an abutment, and a fixing element. The implant is placed in the alveolar bone. The abutment is assembled to the implant and includes a tapered position-restricting part and an elastic pressing part. The tapered position-restricting part has an abutment fixing channel substantially matching the tapered position-restricting outer wall of the tapered position-restricting trench. The elastic pressing part includes the elastic pressing structures extended from the tapered position-restricting part. The fixing element includes the fixing head and the fixing rod extended from the fixing head. A tolerance allowable gap is formed between the abutment fixing channel and the fixing rod. As the abutment is assembled to the implant, the elastic pressing structures press against the position-restricting wall first to hinder the relative rotation therebetween; when an offset error exists, the tolerance allowable gap allows the fixing rod to penetrate the abutment fixing channel.

A three-dimensional (3D) scanner device for generating a three dimensional (3D) surface model of shaped objects, such as dental structures, applicable for use in the field of dentistry, particularly to dental prosthetics manufacturing is described. The scanning device can include a probe head having a particular configuration and utility. Methods and systems relating to the device and components thereof are also disclosed.

A mouthpiece delivery apparatus and methods for the using the same are provided. In at least one specific embodiment, the mouthpiece delivery apparatus can include: a mouthpiece that can include a top receiving wall, a bottom receiving wall, a first side wall and a second side wall, where the bottom receiving wall can include a base member and an edge member; an adapter section, where the adapter section is configured to attach to a dispensing apparatus; and a body section, where the body section is attached to the mouthpiece at a first end and attached to the adapter section at a second end.

A hydraulic circuit includes a clutch actuator operatively associated with a clutch that may be disposed in a transmission. A hydraulic fluid source supplies pressurized hydraulic fluid for the clutch actuator. To measure the filling rate of the hydraulic actuator, a reference actuator having a predetermined filling rate is disposed in parallel with the hydraulic actuator and in fluid communication with the hydraulic fluid source. If hydraulic pressure associated with the reference actuator does not correspond to the hydraulic pressure associated with the clutch actuator, a compensation valve can appropriately respond by selectively directing hydraulic fluid to or from the clutch actuator. In a further embodiment, the reference actuator and compensation valve may be replaced with an electrohydraulic valve utilizing feedback from the hydraulic pressure present at the inlet of the clutch actuator.

A hydraulic circuit includes a clutch actuator operatively with a clutch that may be disposed in a transmission. A hydraulic fluid source supplies pressurized hydraulic fluid for the clutch actuator. An on-off valve is disposed in fluid communication between the clutch actuator and the hydraulic fluid source; the on-off valve configured to fill the clutch actuator with hydraulic fluid. An accumulator is disposed in parallel with the on-off valve and in fluid communication with the clutch actuator. The accumulator is adapted to receive hydraulic fluid redirected from the clutch actuator and to provide a counter-pressure for modulating the clutch actuator.

A selectable one-way clutch includes a pocket plate; a notch plate; engagement pieces housed in housing recesses of the pocket plate; elastic members biasing the engagement pieces; a selector plate switching states of the engagement pieces; and elastic bodies disposed at least in one of contact portions where contact are made between the engagement pieces and the notch plate and contact portions where contacts are made between the engagement pieces and the pocket plate.

A fluid driving device, a motor assembly and a friction clutch thereof are disclosed. The friction clutch includes: a fixing member fixed on a rotary shaft; a connecting member slidable disposed on the rotary shaft, wherein when the rotary shaft starts rotating, an axial distance between the connecting member and the fixing member changes such that a friction force between the fixing member and the connecting member increases until the connecting member rotates synchronously with the fixing member; a loading member slidable disposed on the rotary shaft, the loading member and the connecting member being circumferentially positioned; and a restoring member configured to reduce an amount of change of the axial distance between the fixing member and the connecting member when the rotary shaft stops rotating.

A twin plate separation system, comprising a pressure plate, an intermediate plate facing the pressure plate, and a spring separator assembly. The spring separator assembly comprises a mounting extending out from the intermediate plate towards the pressure plate. A spring surrounds the mounting, and the spring is biased to push the pressure plate and the intermediate plate apart. The mounting or another fixture can secure at least one drive strap to the intermediate plate. Alternatively, the mounting extends out of the pressure plate towards the intermediate plate, and the spring surrounds the mounting and is biased to push the pressure plate and the intermediate plate apart. In this alternative, the intermediate plate does not comprise a hole for receiving the mounting.

A driven damper assembly, comprises a first main-damper cover plate comprising an inclined portion. The inclined portion comprises a notch. A first plane passes through the first pre-damper cover plate. A second plane passes through the first main-damper cover plate and is parallel to the first plane. The notch comprises a first wall and a second wall. The first wall is not parallel to the second wall. The inclined portion extends away from the second plane at an angle greater than zero degrees away from the second plane and less than ninety degrees away from the second plane. The first pre-damper cover plate comprises a tab with a first portion extending outwardly at an angle greater than zero degrees away from the first plane and less than ninety degrees away from the first plane, wherein the tab engages the notch at the first wall and the second wall.

A method for forming a friction facing comprises placing a bonding powder mix in to a die, and placing a performance powder mix in to the die. Pressing the performance powder mix and the bonding powder mix creates a compact. Sintering the compact forms a friction facing. A clutch disc assembly can be formed. A clutch disc can comprise a mounting hole for securing a friction facing and a backer plate can comprise a pass-through hole. A mounting mechanism joins the mounting hole to the pass-through hole. The mounting mechanism comprises a head-height for a portion of the mounting mechanism that is mounted near the sintered compact. The bonding layer comprises a thickness corresponding to the head-height of the mounting mechanism.

A hysteresis device assembly comprises a first spacer plate, a second spacer plate, a stack plate, and a hub. The hub engages the second spacer plate. The hysteresis device assembly further comprises a tabbed washer comprising a tab. The tab engages the first spacer plate and the stack plate.

The present disclosure provides a double clutch assembly and a device for assisting an actuator of the double clutch. The device applies an assistance force to the actuator upon an operation of the actuator. In particular, the double clutch assembly includes first and second actuators which engage or disengage first and second clutches, respectively. The device includes: an elastic member to apply an elastic force; a first transfer portion to transfer the elastic force of the elastic member to the first actuator; and a second transfer portion to transfer the elastic force of the elastic member to the second actuator.