Abstract: An engaging member includes an engaging portion configured to be inserted and assembled into a fixing hole of a vehicle body, an attachment portion configured to attach elongated wire routing materials, and linking portions configured to connect the engaging portion and the attachment portion to each other. The linking portions are extendable and contractable in a longitudinal direction of the wire routing materials, and can oscillate the engaging portion side in an orthogonal direction, thereby allowing the engaging portion to be movable in the longitudinal direction and the orthogonal direction. A protrusion and a through portion are provided as a movement restricting portion for restricting the movement of the engaging portion to movement within a predetermined range.

Abstract: A panel mount connector and method involve a connector shell assembly that is configured to be received in an opening that is defined by a panel with the connector shell defining a through passage. A flexible circuit board is supported within the through passage and defines a first external connection interface at one end for external electrical access from one side of the panel when the connector shell assembly is installed in the panel and at least the first external connection interface is supported for independent movement relative to the connector shell.

Abstract: A faceplate assembly may include a faceplate having an opening configured to receive an electrical device insert, and an adapter that is disposed between the faceplate and a structure. The adapter may abut a surface of the structure. The faceplate assembly may include one or more biasing members that may be configured to bias the faceplate outward relative to the structure. A first biasing member may include one or more resilient fingers. The fingers may be configured to abut a yoke that is installed in the structure (e.g., attached within an opening of the structure). A second biasing member may include a resilient spacer that is configured to be disposed between the faceplate and the adapter. The one or more biasing members may apply forces against the faceplate that may cause the faceplate to be biased outward relative to the surface of the structure.

Abstract: A movable connector includes a movable housing and a plurality of terminals. Each terminal includes a movable portion and a contact portion. The terminal includes a second fixed portion fixed to the movable housing. The second fixed portion includes a first fixed piece portion connected to the contact portion. The first fixed piece portion has press-fit shoulders, to which a pressing force is applied by using a press-fit jig during press-fitting into the movable housing. The second fixed portion further includes a second fixed piece portion connected to the movable portion and a connecting section connecting the first fixed piece portion to the second fixed piece portion.

Abstract: The present invention provides a floating connector that includes a connector housing and a connector body. The connector housing has a housing opening, and the housing opening includes a plurality of conductive terminals. The connector body includes a housing member having a plurality of housing member terminal openings, a tongue connector, and a plurality of S-type conductive terminals connecting the housing member and the tongue connector. Wherein, the displacement of the housing member between the tongue connector retrieved by the deformation range of the S-type conductive terminals. When the connector body is connected with the connector housing, the plurality of S-type conductive terminals and the plurality of conductive terminals remain electrically connected in a floating state.

Abstract: An electrical connector includes an insulative housing and a plurality of contacts retained in the housing, a carrier associated with an electronic package therein to be loaded into the housing, a load plate pivotally mounted by one end of the housing for downwardly abutting against the electronic package for assuring mechanical and electrical connection between the electronic package and the contacts, and a dust cover detachably attached to the carrier during shipping while being removed from the carrier when the electronic package is loaded unto the housing and downwardly pressed by the load plate in a later time.

Abstract: To reduce a size of an image pickup apparatus including a connector that has a terminal having a positional displacement absorption function. A harness-side connector of an image pickup apparatus includes a movable housing that holds a harness-side terminal, a movable gap in which the movable housing can be displaced, and an accommodation portion that accommodates the movable housing in a displaceable manner, the movable housing being displaceable owing to flexibility of a core wire.

Abstract: An antenna unit that includes an antenna, at least one radio unit, and an interconnect that includes first and second mating connectors. The first connector is configured to be electrically and mechanically coupled to the antenna and the second connector is configured to be electrically and mechanically coupled to the at least one radio unit. The first connector has lead-in geometry, and radial and axial float for blind mating of the first and second mating connectors.

Abstract: A movable connector is provided which includes a terminal formed of a single metal piece, the terminal enabling pliability in a movable portion and appropriate contact pressure in a contact portion to be obtained in a compatible way. The terminal of the movable connector includes a plate-thickness-direction conversion portion that interconnects a movable piece and a contact piece, and that reverses a plate thickness direction and a plate width direction of the terminal between the movable piece and the contact piece, and a front elastic arm and a rear elastic arm biasing respectively a front contact point and a rear contact point into pressure contact with the connection target in a direction crossing the plate thickness direction of the contact piece.

Abstract: A connector includes: a stationary housing; a movable housing; a stationary terminal that is retained in the stationary housing; a movable terminal that includes a contact portion and that is retained in the movable housing, the contact portion of the movable terminal being configured to follow movement of the movable housing; a movable shield that follows movement of the movable housing; and a stationary shield. The movable shield and the stationary shield are in mutual contact so as to have electrical continuity. The stationary shield and the movable shield are configured to slide against one another while maintaining electrical continuity when the movable housing moves in the front-rear or the left-right direction with respect to the stationary housing.

Abstract: Provided is a plug connector having an insulator and a plug connector fixing bracket that is hard to collapse (break). A plug connector (15) is attachable to and detachable from a receptacle connector (35) and includes: a plug insulator having an outer wall that includes a pair of longitudinal walls and a pair of transverse walls together constituting an annular projection engageable with an engagement recess of the receptacle connector (35); a plug contact group arranged in a row and supported by the longitudinal wall of the outer peripheral wall, contacts a receptacle contact group when the annular projection is fit into the engagement recess, and is connected to a circuit pattern of a plug side circuit board; and a plug connector fixing bracket mounted on the transverse walls.

Abstract: The invention relates to a plug connector part that can be inserted into a bushing of a partition wall. A plug connector part according to the invention can be connected to a mating part and can be inserted into a recess in a partition wall, whereby the plug connector part has a base with a collar, that projects beyond the surface of the recess in the partition wall, and said plug connector part is characterized in that, on the side of the collar facing the partition wall, there is a first sealing element in the form of an encircling sealing lip, that is arranged in such a way that it rests on the partition wall when the plug connector part is inserted into the recess of the partition wall, whereby the plug connector part also has a second sealing element in the form of a cable entry seal.

Abstract: A floating connector device allows movement of a movable-side housing in board-parallel and pushing directions, allows floating in a pushing/removal direction when mated with a mating connector, and has high contact reliability. A fixed housing (11) includes a long through-hole and a pair of board-facing plates. A movable housing (12) includes an outer portion projecting from the long through-hole and a retaining projection overlapping the board-facing plates in plan view. A contact group includes a tail for board mounting, a fixing portion supported by the fixed housing (11), a U-shaped portion supported by a contact support groove in the outer portion, and an elastic deformation portion, in a free state unsupported by either groove, that by its own elasticity allows the movable housing (12) to sink in a board direction, and in a sunken state, allows elastic movement in a longitudinal direction, a direction orthogonal thereto, and a tilting direction.

Abstract: A power supply connection assembly includes a power connector for mating with a complementary connector, a first conductor electrically coupled to the power connector, a second conductor electrically coupled to the first conductor, and a third conductor electrically coupled to the second conductor. The second conductor is flexible, and the power connector is movable relative to the third conductor in at least one direction. Other example power supply connection assemblies and power supplies including one or more power supply connection assemblies are also disclosed.

Abstract: A seal member for an electrical connector comprises a base portion, a wire seal portion disposed in the base portion, a housing seal portion disposed on an outer end portion of a radial outside of the base portion, and a shell seal portion integrally formed with the base portion, the wire seal portion, and the housing seal portion. The wire seal portion is configured to contact an outer peripheral portion of a wire led out from a housing of the electrical connector. The housing seal portion is configured to be pressed against the housing. The shell seal portion is configured to be pressed against at least a bottom portion of a shell enclosing the housing.

Abstract: A connector with stationary housings, a movable housing, and terminals. The terminals have a movable-side retained portion including a contact portion secured in place by unitary molding in a movable-side retaining portion of the movable housing, a stationary-side retained portion secured in place by unitary molding at a location proximate the connecting portion of the terminals in a stationary-side retaining portion of the stationary housing, and a resiliently displaceable resilient portion coupling the movable-side retained portion to the stationary-side retained portion. The resilient portion has a curved apex portion constituting the upper end of the resilient portion outwardly of the movable-side retained portion in the connector-width direction, and lateral open spaces, which are open in the connector-width direction, are formed in a range including at least the apex portion below the above-mentioned movable-side retaining portion positioned above the apex portion.

Abstract: Apparatus and methods for electrically coupling first and second ground covers involves at least first and second electrically-conductive covers configured to be associated with the first and second ground covers, respectively. The electrically-conductive covers are electrically interconnectable with at least one electrical connector.

Abstract: In a waterproof structure of a connector (11), each of a pair of housings (17, 19) has an annular member (51, 81) projecting in a fitting direction. An outer circumferential surface (81a) of one annular member (81) is inclined so as to spread outward in the radial direction from the front end toward the back, and presses the inner circumferential surface of the other annular member (51) at the time of fitting. The curvature of the outer circumferential surface of the plurality of corner parts (109a to 109d) of the annular member (81a) is larger than the curvature of the outer circumferential surface of the other portion, and the inclination angle of the former outer circumferential surface with respect to the fitting direction is larger than the inclination angle with respect to the fitting direction of the latter outer circumferential surface.

Abstract: A test element analysis system for the analytical examination of a sample, a method for positioning a test element in a measuring device and a method for an analytical examination of a sample are disclosed. The test element analysis system comprises: a measurement device comprising a test element receptacle for receiving a test element at least partially, wherein the receptacle comprises a first part and a second part, the first part comprises a support surface for placement of the test element, the second part comprises an alignment pin for engagement with an alignment hole of the test element, the second part is movable relative to the first part in a direction essentially perpendicular to the support surface, the receptacle is configured to position the second part in at least three distinct positions relative to the first part comprising an intermediate position, a closed position, and an open position.

Abstract: A cable backplane system includes cable backplanes each including a tray configured to be coupled to a chassis and a plurality of cable connector assemblies mounted to the tray. The tray has a plate extending between a front and a rear with mounting locations receiving corresponding cable connector assemblies. The trays are oriented parallel to each other with front openings between the fronts of the plates and rear openings between the rears of the plates. Each cable connector assembly has a housing holding contacts terminated to corresponding cables. Each cable connector assembly has a holder mounted to the corresponding mounting location of the plate. The holder is mounted to the plate and removable from the plate through the rear opening at the rear of the plate.

Abstract: A plug-in system comprises a docking device which has a first plug-in module that is bidirectionally displaceable parallel to a connection direction and at least one spring arm, as well as a second plug-in module which can be connected to the first plug-in module in the connection direction. The plug-in system can be transferred between a separated state, in which the second plug-in module and the docking device are separated from each other and the spring arm limits a displacement of the first plug-in module at least in the connection direction, and a docked state in which the first plug-in module and the second plug-in module are connected to each other and the first plug-in module assumes a position which can be reached by a displacement of the first plug-in module which exceeds the limit in the connection direction.

Abstract: The present invention discloses a blind mating and floating RF connector assembly with low intermodulation, comprising a first connecting device and a second connecting device, wherein the first connecting device comprises a first guide portion and the second connecting device comprises a second guide portion adapted for mating with the first guide portion, wherein the first connecting device has a slotted configuration and is provided, at an end, with a boss projecting radially outwards and the second connecting device is provided with a corresponding inner engaging groove being capable of radially abutting the boss, wherein the second connecting device comprises a fixed mount unit and a floating unit, the floating unit being capable of moving radially and axially relative to the fixed mount unit, in such a way that a plurality of pairs of the first connecting device and the second connecting device can be quickly connected simultaneously via a quick blind mating operation when the first connecting device an

Abstract: A connector with stationary housings, a movable housing, and terminals. The terminals have a movable-side retained portion including a contact portion secured in place by unitary molding in a movable-side retaining portion of the movable housing, a stationary-side retained portion secured in place by unitary molding at a location proximate the connecting portion of the terminals in a stationary-side retaining portion of the stationary housing, and a resiliently displaceable resilient portion coupling the movable-side retained portion to the stationary-side retained portion. The resilient portion has a curved apex portion constituting the upper end of the resilient portion outwardly of the movable-side retained portion in the connector-width direction, and lateral open spaces, which are open in the connector-width direction, are formed in a range including at least the apex portion below the above-mentioned movable-side retaining portion positioned above the apex portion.

Abstract: A movable connector with which an insertion force of a connection object that places a load on a solder portion can be reduced, that has a floating function, and that can be reduced in size is provided. As a result of a pushing operation in which an operation housing is pushed into a fixed housing, a relay terminal is conductively connected to a substrate connection terminal, which is in conductive contact with a substrate, and a pin terminal, which is disposed in a movable housing and serves as the connection object, in the movable housing. Accordingly, the overall size of the movable connector can be reduced. In addition, the insertion force applied to the pin terminal is not applied to the solder portion by which the movable connector is fixed to the substrate, so that conduction failure does not occur.

Abstract: An aesthetically pleasing docking station that is able to support electronic devices with only an interface connector. The docking station is further equipped with mechanisms that protect the electronic device from damage if it's deflected too far while mated to the docking station.

Abstract: An electronic module includes, a circuit board having front and rear edges, and first and second connectors. The rear edge includes, (i) a first section at a first distance from the front edge, and (ii) a second section at a second distance from the front edge, different from the first distance. The first and second connectors are mounted along the rear edge at the first and second sections, respectively, and are configured to connect the circuit board to an interconnect unit.

Abstract: A connector device includes: a motor-side connector 30 including motor-side terminals 31; an inverter-side connector 60 including inverter-side terminals 70; a motor case 10 including the motor-side connector 30; and an inverter case 50 including the inverter-side connector 60. The connectors 30, 60 are fitted to each other when the inverter case 50 is stacked on and coupled with the motor case 10. The motor-side connector 30 is fixedly mounted in the motor case 10 via a mounting hole 11 of the motor case 10. The inverter-side connector 60 is supported on the inverter case 50 while penetrating through a mounting hole 79 of the inverter case 50 in a radially freely movable manner.

Abstract: Various methods and systems are provided for detecting an unplugged radio frequency (RF) coil in a magnetic resonance imaging (MRI) system. In one embodiment, a device for an RF coil comprises an alert generator, a power source, and a field-sensitive switch including an open state and a closed state, wherein the field-sensitive switch switches from the open state to the closed state responsive to sensing a magnetic field with a strength above a threshold, and wherein the field-sensitive switch in the closed state electrically couples the alert generator and the power source. In this way, an alert may be generated to notify an operator of an MRI apparatus of an unplugged RF coil.

Abstract: A coaxial connector includes a body element that has an inner bore configured for receiving a cable having inner and outer conductors. A center conductor element is configured for engaging an inner conductor of the cable. A tubular ground slide extends over the center conductor element and has a front end and rear end with the rear end of the slide engaging the body element for being axially movable on the f the body element. A spring is configured to engage an outer surface of the body element and abut the rear end of the ground slide for biasing the ground slide with respect to the body element. A conductive sleeve has a rear end configured for press fitting onto the body. The sleeve is further configured for capturing the spring and ground slide with the body element and has a plurality of spring fingers at a front end thereof that contact the front end of the movable ground slide for providing electrical connection with the body element.

Abstract: An electrical connector includes a terminal having a connecting portion to be connected to an electrical circuit board and a contact portion to be contacted with a mating connector; and a housing for holding the terminal. The housing includes a fixed housing and a movable housing arranged to be movable relative to the fixed housing. The terminal includes a fixed side held portion held with the fixed housing, a movable side held portion held with the movable housing, and an elastic portion situated between the fixed side held portion and the movable side held portion. The housing includes an accommodating space for accommodating the elastic portion. The elastic portion includes a first wave shape portion having a first bent portion and a pair of first extending portions. The first extending portions are configured to extend away from each other with a distance in between decreasing toward the first bent portion.

Abstract: Connection reliability of terminals in a movable connector is enhanced. The movable connector includes a fixed housing having an abutment receiving portion and a movable housing having an abutment portion. When a pin terminal is fitted and inserted, the abutment portion abuts on the abutment receiving portion. This prevents arcuate curved deformation of the movable housing, and restricts a movable piece of a terminal at a center portion of the movable housing from being slightly stretched from the beginning of fitting and from constantly receiving load.

Abstract: Previously available multiport connector pairings that use floating devices typically include relatively generous lead-in chamfers surrounding receiving ports in order to facilitate blind mating. As port density increases there is less room for lead-in chamfers, and in turn, blind mating becomes more challenging. By contrast, various implementations disclosed herein include multiport connection arrangements that include a floating connection device at least partially included within a port, and a radial centering mechanism arranged in combination with the floating connection device. The radial centering mechanism imparts a force that biases the floating connection device along the axis of the port. In some implementations, the radial centering mechanism imparts a substantially balanced axial force in order to bias the floating connection device. In some implementations, the radial centering mechanism imparts a substantially radial force in order to bias the floating connection device.

Abstract: Corrosion within a flangeless connector, or at an associated connection of a device or medium (e.g., cable), used in a wireless base station may be reduced by incorporating a seating member, e.g., an O-ring, between the connector and a connector port. Conductive plating selectively applied within the connector port may provide a low-resistance ground connection between the port and the connector, while a non-conductive coating selectively applied to a surface against which the seating member is seated may form a weather-tight seal. The connection between the connector and the connector port is thereby protected from moisture, while exposed surfaces of the connector port re protected by the non-conductive coating.

Abstract: The connector has multiple connection elements arranged on a circuit board and supports which support the connection elements. The connection elements have terminals connected to counterpart terminals in a counterpart connector, as well as stationary retainers and movable retainers that secure the terminals in place. The terminals have connecting portions at one end of the terminals, and contact portions at the other end, and the contact portions are secured in place on one side of the movable retainers. Flexible portions are formed between the movable retainers and the stationary retainers. The movable retainers are provided with biasing members on the other side opposite to the side on which the contact portions are positioned.

Abstract: Various technologies to facilitate coupled electrical and mechanical measurement of conductive materials are disclosed herein. A gripping device simultaneously holds a specimen in place and causes contact to be made between the specimen and a plurality of electrodes connected to an electrical measuring device. An electrical characteristic of the specimen is then measured while a mechanical load is applied to the specimen, and a relationship between the mechanical load and changes in the electrical characteristic can be identified.

Abstract: A self-aligning RF connector interface comprises an electrical feed-trough with a connector body and an internal connector. The connector body defines a longitudinal axis. The connector interface further comprises a centering collar, a connector guide and an outer housing. The centering collar is spring loaded by a second axial spring and retractable with respect to the connector body. The connector body is spring loaded by a first axial spring and retractable and tiltable with respect to the connector guide. The connector guide is movable in a plane transverse to the longitudinal axis.

Abstract: Considering a case that a device requiring electric power is arranged in a room where an actuator such as an automatic driving device is disposed, a power cable, a control signal cable, and an electric power cable for the actuator are arranged in parallel and extended in one direction, and thereby a flat part is formed. In a cable side connector provided at both ends of the flat part, a connection terminal of the control signal cable is held at a position where a connection terminal of the electric power cable is put between the connection terminal and a connection terminal of the power cable.

Abstract: In a coaxial connector with a floating mechanism, a housing of a socket includes a housing base portion and a housing movable portion which can move radially over a plug-side end face of the housing base portion with a socket-side center contact. A top side of a plug-side shell is fitted onto the housing movable portion. A socket-side shell integrally includes shell contact plate portions which are exposed from the plug-side end face of the housing base portion. An end of the plug-side shell is configured to come into contact with the shell contact plate portions.

Abstract: Devices for simulating a transportation emergency are disclosed. The devices have a base with a framework of interconnected supports extending therefrom as a skeletal portion of a simulated transportation device and defining a chamber configured to receive a human or a medical-training manikin. Within the chamber a seat for receiving the human or the medical-training manikin is disposed. The framework defines one or more openings representative of access openings into the simulated transportation device such that a first responder in-training can receive instructions on how to assist a victim positioned in the simulated transportation device. The framework also defines one or more open frames representative of structural features of the simulated transportation device that block access to the victim such that realistic training occurs. The device may include one or more props such as a telescoping steering column, a prying simulator, a foot pedal unit, and a side impact bar.

Abstract: The present application relates to the field of electric connector, particularly to an electric connector. The electric connector comprises a fastening body, a floating body and a plurality of electric terminals. The fastening body includes stop grooves, the floating body includes stop protrusions, and the electric terminals include resilient segments. The fastening body can overlap the outside of the floating body. The two stop protrusions are respectively located at the two sides of the floating body, and are respectively clutched in the two stop grooves when the fastening body 1 overlaps the outside of the floating body. The electric terminals are divided into two sets and are plugged into the fastening body and the floating body at the same time when the fastening body overlaps the outside of the floating body. The resilient segments are respectively located at one end of the electric terminals and are made by folding each electric terminal into a two layer structure.

Abstract: Interconnection systems are shown that include communication contacts, and a guide. Configurations are shown with a guide that locates a male portion with respect to a female portion and guides their engagement before any communication contacts are engaged. Configurations are also shown with a guide that includes one or more power contacts.

Abstract: It is aimed to smoothly proceed with a connecting operation of a connector (10) and improve assembling operability. The connector (10) includes a housing (20) connectable to a mating housing (80) disposed on a solenoid (40), and a swing support portion (61) arranged on a side where a valve body (50) to be mounted with the solenoid (40) is located and configured to support the housing (20) swingably in a direction intersecting with a connecting direction and cause the housing (20) to be connected to the mating housing (80) as the solenoid (40) is mounted into the valve body (40).

Abstract: The invention relates to an electrical contact for an electrical plug connection, said contact having a flexible element between a connecting region fixed in a housing and a movable contact region. In the electrical contact, the movement of the contact region and/or the deformation of the flexible element in the direction of an axis extending parallel to the plugging direction of the contact region is/are limited. Such contacts are provided in particular in power sockets for motor vehicles for creating an electrical connection to a trailer.

Abstract: A cable backplane system includes cable backplanes each including a tray configured to be coupled to a chassis and a plurality of cable connector assemblies mounted to the tray. The tray has a plate extending between a front and a rear with mounting locations receiving corresponding cable connector assemblies. The trays are oriented parallel to each other with front openings between the fronts of the plates and rear openings between the rears of the plates. Each cable connector assembly has a housing holding contacts terminated to corresponding cables. Each cable connector assembly has a holder mounted to the corresponding mounting location of the plate. The holder is mounted to the plate and removable from the plate through the rear opening at the rear of the plate.

Abstract: The present invention discloses a blind mating and floating RF connector assembly with low intermodulation, comprising a first connecting device and a second connecting device, wherein the first connecting device comprises a first guide portion and the second connecting device comprises a second guide portion adapted for mating with the first guide portion, wherein the first connecting device has a slotted configuration and is provided, at an end, with a boss projecting radially outwards and the second connecting device is provided with a corresponding inner engaging groove being capable of radially abutting the boss, wherein the second connecting device comprises a fixed mount unit and a floating unit, the floating unit being capable of moving radially and axially relative to the fixed mount unit, in such a way that a plurality of pairs of the first connecting device and the second connecting device can be quickly connected simultaneously via a quick blind mating operation when the first connecting device an

Abstract: First and second electrical connectors are configured to be supported by each other prior to being mated to at least one complementary electrical connector. The at least one complementary electrical connector can be a common third electrical connector. The first electrical connector can be configured to be mounted onto a first electrical component of a first type. The second electrical connector can be configured to be mounted onto a second electrical component of a second type that is different than the first type. For instance, one of the first and second electrical components can be a printed circuit board, and the other of the first and second electrical components can include a plurality of electrical cables.

Abstract: The present invention relates to a coaxial connector. According to the present invention, there is provided a coaxial connector which is installed for electrical connection of a communication module, and includes a first connector in which an insulator through which a conductor penetrates is installed inside a first housing, and a conductive gasket is seated between the first housing and the insulator; and a second connector which is coupled so that a front end comes into close contact with the conductive gasket.

Abstract: A connector includes a plurality of contacts each including a contacting portion, provided at one end, that contacts a counterpart connector, a lead portion, provided at another end, that contacts a substrate, and a spring portion, provided between the contacting portion and the lead portion, that elastically deforms; a floating housing, fixed to the contacting portions of the plurality of contacts that are aligned in two columns of contacts, that fits with the counterpart connector; a first fixed housing, provided between the two columns of contacts, that is fixed to the substrate, and a second fixed housing, fixed to the first fixed housing, that sandwiches a portion adjacent to the lead portion of each of the plurality of contacts with the first fixed housing.

Abstract: A vibration resistant connector is disclosed. The connector employs a friction member to create a resistance between a coupling nut of the connector and a connector body of the connector that is disposed in a cavity formed by the coupling nut. In some embodiments, the friction member is in the form of an O-ring that encircles a portion of the connector body and that is compressed by the coupling nut.

Abstract: The present invention includes a lower plate, an upper plate provided above the lower plate in such a manner that the upper plate is biased so as to be vertically movable, a guide member attached to the upper plate, the guide member guiding vertical movement of the upper plate, and a spring provided below the guide member, the spring biasing the upper plate upward via the guide member. In the lower plate, an insertion hole having a size that allows the spring and the guide member to pass therethrough in a vertical direction is formed. In the insertion hole, a spring holding member that holds the spring is detachably provided. Such configuration enables suppression of warpage of the upper plate caused by a biasing force of the spring and enables work for replacement of the upper plate to be performed easily and quickly.