Abstract: An image forming system includes the following elements. An image forming apparatus forms images on plural sheets sequentially transported with a spacing therebetween. A sheet transport apparatus includes a transport section which receives and transports the plural sheets farther downstream. The sheet transport apparatus supplies a different type of sheet from a different-type-of-sheet supply device, inserts it into the spacing, and transports the sheets. The sheet transport apparatus includes the following elements. A transport information obtaining unit obtains information concerning transporting of sheets. A different-type-of-sheet stop unit supplies the different type of sheet, on the basis of the information concerning transporting of sheets, and stops the different type of sheet at a position before the transport section.

Abstract: An image forming apparatus includes a sheet-medium conveying device, which has a first sheet-medium stacker part provided on a casing so as to be capable of being opened from and closed to the casing; a second sheet-medium stacker part provided on the first sheet-medium stacker part so as to be capable of being drawn from and inserted into the first sheet-medium stacker part; and an auxiliary member provided on the first sheet-medium stacker part so as to be capable of being moved, the auxiliary member being engaged with the second sheet-medium stacker part so as to be moved together with the drawing of the second sheet-medium stacker part so that the auxiliary member covers a gap portion between the main sheet-medium stacker surface and the expanded sheet-medium stacker surface when the second sheet-medium stacker part is in a drawn state.

Abstract: Embodiments of the invention include a media tray for a media advance mechanism. The media tray includes an access door attached to the media tray via a hinge oriented in a vertical direction and a cleanout disposed on an interior surface of the access door. The access door pivots open around the hinge. The cleanout is mounted such that the cleanout can move translationally along the access door.

Abstract: Devices and methods to collect and align print media sheets. According to a device herein, a tray has a base and receives print media sheets. Registration guides are connected to the tray. The registration guides define a corner in the tray. A tamper mechanism comprises a rotating helical brush extending perpendicularly from the base adjacent to a side of the tray opposite the corner. The tamper mechanism is positioned to tamp the print media sheets against the registration guides causing a stack of the print media sheets to be squared against the corner.

Abstract: A sheet conveying device includes a conveying unit configured to convey a sheet by a first rotating body and a second rotating body that is provided so as to be movable in a contacting/separating direction with respect to the first rotating body; a rotation amount measuring unit configured to measure a rotation amount of the second rotating body, the rotation amount measuring unit being provided so as to be movable in the contacting/separating direction along with the second rotating body; and a conveying distance calculating unit configured to calculate a conveying distance of the sheet based on a measurement result obtained by the rotation amount measuring unit.

Abstract: A conveying apparatus includes a first pair of rollers having a drive roller and a pinch roller driven by the drive roller, a second pair of rollers provided downstream of the first pair of rollers, and an arm member supporting the drive roller and adapted to be swingable such that a force for pressing the drive roller against the pinch roller increases as a conveyance resistance of the sheet increases. The force for pressing the drive roller against the pinch roller decreases if driven by the moving sheet. The conveying speed of the second pair of rollers is set to be higher than the conveying speed of the drive roller so as to cause the drive roller to be driven by the sheet in the case where a skew of the sheet has been corrected and the sheet having the skew corrected is conveyed by the second pair of rollers.

Abstract: A medium conveyance device includes a pressed member, a first retention member retaining the pressed member and including a first bias-member retention portion, a press member provided facing the pressed member, a second retention member being provided movable relative to the first retention member and retaining the press member wherein the second retention member includes a second bias-member retention portion, and a bias member provided between the first bias-member retention portion and the second bias-member retention portion and supported at one end thereof by the first bias-member retention portion and at another end thereof by the second bias-member retention portion, thereby pressing the press member against the pressed member.

Abstract: According to one aspect of the present invention, a projectile target is disclosed comprising a target having a substantially sealed chamber having a front face and a rear face with an enclosing side wall disposed intermediate. The front and rear faces are formed by membranes configured to allow a projectile to pass therethrough and then substantially seal to maintain the substantially sealed chamber. Pressure wave sensors are disposed within the chamber and are configured to detect pressure waves created by the projectile. A target controller receives signals from the pressure sensors indicative of the pressure sensed by the sensors and determines an impact point of the projectile on the front face of the target.

Abstract: An illustrative embodiment of a multi-shaft seal assembly generally includes a first seal, a second seal, and a collar. In the illustrative embodiment the collar may be integrally formed with a portion of the first seal, and may serve to axially space the second seal from the first seal. The second seal may be formed with a cutaway therein to ensure proper clearance between the second seal and one of the shafts. Other embodiments of the multi-shaft seal assembly use a collar formed with the equipment housing or second seal. Still other embodiments include additional seals for additional shafts.

Abstract: One embodiment of the face seal described herein includes a seal seat and a seal element carried by a seal housing. The seal element cooperates with the seal seat to establish a seal. The housing includes a seal element support and a shroud. The seal housing is made of a parent material and the shroud has a tip impregnated with a second material.

Abstract: A sealing arrangement used to create a seal between a first part of a chain and a second part of the chain, wherein the second part can at least be pivoted in relation to the first part, includes a sealing ring with an annular sealing lip for sealing a lubricant area between parts which can be pivoted towards each other, and an elastic ring which is adapted to be fixed to one of the parts and which is adapted to exert pressure in the sealing ring. In addition, a supporting ring is arranged between the sealing ring and the elastic ring.

Abstract: A rotary seal for dynamically sealing against a surface of a shaft includes a seal body having a sealing surface and an outer surface. The sealing surface has a first side edge and a second side edge. The sealing surface has discrete fluid pockets positioned between the first side edge and the second side edge. The discrete fluid pockets trap and use clean lubricating fluid to provide a hydrodynamic film between the seal surface and rotating shaft.

Abstract: A segmented intershaft seal assembly for counter-rotating and co-rotating turbine engines is described. The assembly includes a pair of end rings, an annular seal element, and at least one resilient element. At least one end ring has a flange that extends from one side thereof. The flange has a lower annular surface. The seal element includes at least two seal segments. Each seal segment includes a ring segment and a ring flange segment. The ring segment has an upper radial surface. The ring flange segment directly contacts and extends from the upper radial surface forming either a substantially “T”-shaped or “L”-shaped cross section. The seal segments are disposed between the end rings. At least one resilient element biases each seal segment away from the inner shaft so that the upper radial surface contacts the lower annular surface and a portion of the ring flange segment extends beyond the flanges.

Abstract: A cover for the gap in an automobile automatic gear shift assembly is presented. The gap cover is formed from a single molded housing with inward pointing fibrillations. These fibrillations act as fingers to cover the hole created when the multi position mechanism is moved from one position to another. The fibrillations are assisted back to their original position through (1) physical properties of the advanced polymeric substance used to mold the housing and (2) through the interactions of assisting tabs formed on the back side of the fibrillations, which act as springs.

Abstract: In a device for machining, in particular etching and/or developing, substrates, in particular wafers, in particular etching and/or developing, having a turntable, the turntable has a Venturi gap.

Abstract: The invention relates to a high-precision clamping device for tools in machine tools of the conventional type according to ISO 15488 and to a collet chuck, a base and a tensioning nut. The invention also relates to a chuck key for tightening the locknut without radial stress. The clamping device according to the invention is characterized by a substantially improved runout accuracy, torsional rigidity of the collet chuck and rigidity of the tool clamped therein.

Abstract: A suspension system for a vehicle having a vehicle body and a road wheel includes a suspension corner connecting the road wheel to the vehicle body. The suspension corner maintains contact between the road wheel and a road surface. The suspension system includes a bladder arranged at the suspension corner for pumping a fluid in response to forces generated at the wheel and holding a volume of the fluid. The suspension system also includes an accumulator in fluid communication with the bladder for selectively accumulating the fluid pumped by and releasing the fluid to the bladder. The suspension system additionally includes a valve for selectively retaining the accumulated fluid in and releasing thereof from the accumulator. The height of the bladder varies in response to the volume of fluid being held by the bladder to set a ride height of the vehicle at the suspension corner.

Abstract: A vehicle height control device comprises a vehicle height control unit including a jack housing of a hydraulic jack provided at an upper end portion of an inner tube, a suspension spring provided between an upper end of a hollow pipe and a plunger of the hydraulic jack, a pump housing provided at the plunger of the hydraulic jack and forming a pump chamber of a hydraulic pump, and a pump pipe communicating with an oil reservoir chamber on an inner periphery of the hollow pipe and slidably inserted into the pump chamber in the pump housing, and a selector valve controlling the vehicle height by adjusting the amount of hydraulic oil fed to a jack chamber in the hydraulic jack by the hydraulic pump that performs the pumping operation in conjunction with extending and contracting motion of the hollow pipe with respect to the inner tube.

Abstract: An ice skate blade assembly for attachment to a footwear comprising a flexible sole includes; an elongated blade comprising an ice engaging edge; the elongated blade and the ice engaging edge comprising a flexible region; the elongated blade and the ice engaging edge flexible to flex in the flexible region; and the elongated blade comprising an upper portion extending opposite the ice engaging edge, the upper portion for attachment of the elongated blade to the flexible sole of the footwear.

Abstract: A skate assembly includes a shell structure and a removable tendon guard. The shell structure includes a heel portion, a lateral ankle portion, and a medial ankle portion. The heel portion is formed to cover a human heel. The lateral ankle portion is formed to extend beyond the heel portion. The medial ankle portion is formed to extend beyond the heel portion. The lateral ankle portion and the medial ankle portion are spaced apart to form a notch extending toward the heel portion. The removable tendon guard is removably attached between the lateral ankle portion and medial ankle portion to cover the notch.

Abstract: A binding system for snowboards that minimizes leg pain while snowboard users are approaching or are riding on a chairlift. The rotatable binding system enables one of two boot bindings attached to a snowboard to rotate up to 90 degrees placing a user's boot in parallel with the long sides, and sliding direction, of the snowboard. The binding system includes a base plate, which is fixed to the snowboard, and a top plate that is rotatably attached to the base plate by a center screw, and a boot binding harness mounted to the top plate. A hinge plate can connect the base plate to a mid static disk, which can in turn rotatably attach to the top plate. The binding system can include a latch lever that acts as a hands-free locking system that is mounted through an outer ridge of the base plate and connected to a retractable plunger.

Abstract: A wheel 4 mounted on a vehicle body 2 by a suspension arm 6 can be retained in a raised position by a retaining mechanism 10. The retaining mechanism 10 comprises a latching element 12 which can be disposed in a deployed position by a control element 14. When the control element 14 is moved to a position corresponding to the deployed position of the latching element 12, the latching element 12 is resiliently displaceable towards the vehicle body 2, to allow the suspension arm 6 to rise, for example when the wheel 4 is driven over an obstacle. The latching element 12 can then move to the deployed position to prevent lowering of the arm 6, so retaining the wheel 4 in the raised position. All wheels of the vehicle may be moved to the raised position, so as to reduce the ride height of the vehicle.

Abstract: A folding device for a golf cart includes a main part to which two side wheels, a handle and a front wheel unit are connected. A tubular portion is movably mounted to a front wheel stem and a connection member is connected between the tubular member and a handle stem. Two rods are connected between side wheel stems. An operation member is pivotably connected to the tubular portion and has notches so that the protrusion of the main part is engaged with the notches to control the main part to connect to or to separate from the tubular member. The tubular member is movable on the front wheel stem so as to fold or expand the front wheel unit.

Abstract: A ball cart comprising a removable and rotatable ball basket having a plurality of separated chambers that are each able to hold a different kind of ball. Thus, whenever a particular type of ball is desired, a user is able to rotate the basket and lock it in place such that a lid of the chamber that holds balls of that type is accessible to the user. As a result, the user is able to easily select that type of balls desired from the ball cart without sifting through all of the balls in the ball cart.

Abstract: A boat dolly system facilitates transportion of a watercraft on land toward a fishing hole while protecting the bottom end of the watercraft from damage. The system includes a boat having a top end, a bottom end, a front end and a rear end. A pair of front straps is couplable to a front end of the boat and is extendable around the front end and a bottom end of the boat. A pair of rear straps is couplable to and extendable around a rear end of the boat. A lower rear mounting assembly includes at least one wheel and a lower mounting bracket. The at least one wheel of the lower rear mounting assembly is coupled to and extends downwardly from the lower mounting bracket. The lower mounting bracket is couplable to the bottom end of the boat. Each of the front straps and the rear straps is couplable to the lower mounting bracket.

Abstract: In a movable bed composed by combining a bed main portion and a wheelchair, the wheelchair has chair back bottom rails having cutout portions in a chair back bottom, and a chair back guide portion installed rotatably about a rotation point with respect to a chair base portion, the chair back guide portion having sliding portions engaged with the chair back bottom rails so as to be slidable and arranged to be disengageable from the chair back bottom rails by being located in the cutout portions, and in a fourth state (flat posture), the sliding portions are located in the cutout portions, the chair back guide portion and the chair back bottom are disengaged so as to be separable from each other, and a back lifting posture of the bed main portion and the chair back bottom can be performed over the entire width of the bed, whereas in a first state (chair posture), the sliding portions are engaged with the chair back bottom rails and can slide along the chair back bottom rails.

Abstract: A transport cart includes a cart frame with wheels. A load carrier has bottom and side walls and an end wall structure at a first end, opposite a second end. A pivot axle is arranged between the cart frame and the load carrier so the load carrier pivots about a single axis. An interfering stop structure on the cart frame and the load carrier prevents pivotal movement of the load carrier beyond a predetermined angle. The pivot axle is arranged offset relative to a center of gravity of the load carrier. A force applying device provides a pulling force on the load carrier to pivot the load carrier relative to the cart frame. An arrest mechanism may be provided to arrest pivotal movement of the load carrier in a direction opposite of the pulling force, unless the arrest mechanism is released by a user of the transport cart.

Abstract: A vehicle is disclosed. The vehicle may include a base portion and a modular portion. The base portion may be a four wheel vehicle having an operator area with seating for at least two occupants in a side-by-side arrangement. The modular portion may be coupled to the base portion resulting in a six wheel vehicle. The wheels of the modular portion may be powered by an engine of the base portion.

Abstract: According to a further embodiment, an automotive vehicle including a body frame having opposed side frames and a subframe having opposed side members is disclosed. The subframe includes a stabilizer bar connection assembly comprised of generally U-shaped recess formed in each of the opposed side members and a generally U-shaped bushing disposed within the recesses. The opposed side frames overlie the opposed side members adjacent the recesses and secure the bushings within their respective recess.

Abstract: A shear spring having a base plate having a flat upper surface, and an upper plate having a V-shaped upper surface opposite the base plate adapted to mate with a corresponding V-shaped surface positioned on a side wall of a spring mount, the upper plate having a flat lower surface parallel to the flat upper surface of the base, and an elastomeric material positioned between the flat upper surface of the base plate and the flat lower surface of the upper plate.

Abstract: A fender system for a bicycle has a first base member, a second base member, a fender, and at least one return member. The first base member is secured relative to the bicycle. The second base member is rotatably supported by the first base member. The fender is secured to the second base member. The at least one return member biases the second base member into an initial position relative to the first base member.

Abstract: A retractable bicycle fender has a bistable Spring strip with an elastomeric grommet at the end. A hole goes through the grommet and the Spring strip to allow mounting on a bicycle seat post. Plastic wings coat the edges of the Spring strip to increase the width of the fender and reduce the noise and rate of recoil. The bicycle fender can be manually extended in wet weather and recoiled in dry weather.

Abstract: A transmission assembly for a human- and/or motor-powered vehicle, including a hollow transfer shaft, first and second inner one-way needle bearings, the first inner one-way needle bearing disposed within a first hollow end of the transfer shaft, and the second inner one-way needle bearing disposed within a second hollow end of the transfer shaft; and a first and a second outer one-way needle bearings, each having an inner diameter and an outer diameter, the first outer one-way needle bearing disposed about the outer diameter of the transfer shaft near the first hollow end of the transfer shaft, and the second outer one-way needle bearing disposed about the outer diameter of the transfer shaft near the second end of the transfer shaft, such that the inner diameter of each of the first and second outer one-way needle bearings contacts the outer diameter of the transfer shaft.

Abstract: A bicycle fork includes a pair of fork leg assemblies, each of the leg assemblies having an upper leg telescopingly engaged with a lower leg. A damping assembly is provided in at least one of the legs. The damping assembly includes lock-out and blow-off compression circuits. These compression circuits are externally adjustable without tools. Furthermore, these two compression circuits may be adjusted independently of each other.

Abstract: A bicycle wheel carrier assembly is equipped with a rim brake with pads (5) which is built into the structure of the carrier assembly. The rim brake includes two actuating arms (3) and two pad-bearing brake arms (4). Each actuating arm (3) associated with a pad-bearing brake arm (4) is articulated in a recess of the structure of the carrier assembly between a first position in which it is retracted within the structure and a second position providing access to the pad-bearing brake arm (4).

Abstract: A shock-absorbing seat post for a bicycle includes a connecting mount, a rod member, a shock-absorbing member and a fastening unit. The connecting mount has two connecting lugs each having a first through hole, and a receiving space defined between the two connecting lugs. The rod member has a connecting insert received in the receiving space and provided with a second through hole aligned with the two first through holes. The shock-absorbing member has two lateral walls, a tube portion located between the two lateral walls and provided with an axial hole aligned with the two first though holes. The fastening unit is inserted in the two first through holes, the second through hole and the axial hole for combining the connecting mount, the rod member and the shock-absorbing member together.

Abstract: A switchable mechanism for steering a trailer when towing and backing is disclosed. A turntable having a rotatable upper portion is attached to a front of a trailer, with a slide mounted to the turntable with a center of the slide mounted generally over an axis of rotation of the turntable. A carriage is mounted to the slide, the carriage being movable between a first position and a second position. At least one steering controller is coupled between the carriage and steerable wheels of the trailer. A towbar is coupled to the turntable, with sideways displacement of the towbar steering the steerable wheels in both forward and backward directions. The towbar is connectable to any conventional hitch, meaning that no modifications are needed to the tow vehicle, and any tow vehicle with a conventional hitch can tow a trailer of the instant invention.

Abstract: In one example, a jack adaptor is mounted to a trailer structure. A jack flange, which can comprise a jack flange extension, of a jack is inserted downwardly through an opening in an upper portion of the jack adaptor. The jack can be rotated to a position that misaligns the jack flange with the opening through which it has been inserted. The jack can then be actuated to raise the jack flange into engagement with the upper portion of the adaptor for use in raising the trailer structure. The process is reversed to disengage the jack flange from the adaptor to permit removal of the jack.

Abstract: A ball mount holder assembly for mounting to a carrying device includes a body having opposed sides and a stake flange that extends substantially perpendicularly from one of the opposed sides that is adapted to be secured to a surface. A pin flange extends substantially perpendicularly from an opposite one of the opposed sides and in a direction opposite the stake flange and is adapted to receive and carry a ball mount.

Abstract: Disclosed is a tow adapter for coupling a device to be towed to a towing vehicle. The tow adapter includes a bracket adapted to be attached to the towing vehicle, a loop suitable to support a tether to enable the towing vehicle to tow the device to be towed, the loop having first and second ends operably mounted to the bracket, a hook operably mounted to the bracket and positioned central of the loop such that at least part of a curved portion of the hook is disposed within the loop, the hook and the loop being pivotable relative to the bracket about a pivot operably attached to the bracket. The tether may be threaded through the loop and attached to the hook to enable the towing vehicle to tow the device to be towed.

Abstract: A tongue weight donut scale includes a tongue weight donut scale body having an upper planar surface, a lower planar surface, and a central opening having an inner diameter, a weight sensor coupled to the tongue weight donut scale body and generating a signal representative of a weight on the tongue weight donut scale, an indicator box converting the signal from the weight sensor into a weight value and providing a weight value output, and a display window displaying the weight value output. The tongue weight donut scale detects the tongue weight of a trailer attached to a trailer hitch ball, when the tongue weight donut scale is installed between the base of the trailer hitch ball and the ball support of a trailer hitch.

Abstract: A buggy for transporting children has a frame and wheels that are rotably mounted relative to the frame to support the frame above a ground surface. A primary seat is operatively supported by the frame for supporting a first child. A secondary seat is operatively supported by the frame for supporting a second child. The buggy is convertible between an in use configuration for transporting children and a folded storage configuration, whether or not the secondary seat is attached. The secondary seat may be detachable. The secondary seat may be positioned at least partly behind and at least partly below the primary seat.

Abstract: An apparatus (10) helps to protect an occupant (13) of a vehicle (12) that has a roof (18), a side structure (16), and a trim piece (310) overlying the side structure (16). The apparatus (10) includes an inflatable curtain (14) that is inflatable away from the vehicle roof (18) to a position adjacent the side structure (16) of the vehicle (12). A deployment ramp (200) includes a mounting member (202) that helps to support the inflatable curtain (14) in a stored condition. A deployment member (220) helps to direct the inflatable curtain (14) to deploy inboard of the trim piece (310). A co-extruded joint interconnects the mounting member (202) and the deployment member (220).

Abstract: A vehicular passive safety device includes a vehicular seat, a far-side airbag device, and a roof airbag device. The vehicular seat has a seat cushion and a seat back. In the far-side airbag device, a far-side airbag that is accommodated in a lateral portion of the seat back located inside in a vehicle width direction is supplied with a gas from a far-side inflator, and is expanded and deployed forward of the lateral portion with respect to a vehicle. In the roof airbag device, a roof airbag that is accommodated in a ceiling portion of a vehicle body is supplied with a gas from a roof inflator, and is expanded and deployed downward of the ceiling portion, and the expanded and deployed roof airbag abuts on or faces an upper portion of the expanded and deployed far-side airbag from inside in the vehicle width direction.

Abstract: A curtain air bag system includes a curtain air bag that is housed folded up in an upper edge portion of a door opening, and that includes a first deployment portion that deploys when a vehicle is collided with in a side collision as well as when the vehicle rolls over, and a second deployment portion that deploys at least when the vehicle rolls over, by receiving a supply of gas. The first deployment portion deploys in a cylindrical shape extending in a vehicle longitudinal direction, above a belt line such that a rear end side of the first deployment portion overlaps with a center pillar when viewed from a side of the vehicle, and the second deployment portion deploys such that a lower end extends below the belt line, in a position not overlapping with the first deployment portion when viewed from the side.

Abstract: A vehicle seat assembly comprises a vehicle seat comprising a rigid frame, one or more resilient portions and a covering material, wherein an openable deployment seam is provided at a portion of the covering material, and wherein the vehicle seat defines a recess. An airbag module is provided within the recess and comprises a housing, an airbag and an inflator system. Also provided is gripping means which is movable between a first position and a second position in which the portion of the covering material is restrained to assist deployment of the airbag through the deployment seam.

Abstract: A vehicle side door structure has: a door outer panel; a door inner panel having a service hole; a door trim mounted to a vehicle transverse direction inner side of the inner panel; an inner pad provided, between the inner panel and the trim, spanning, in a vehicle longitudinal direction, over an outer peripheral edge of the hole as seen in a vehicle side view; and an outer pad between the outer and inner panels overlapping a vehicle transverse direction outer side of the inner pad as seen in a vehicle side view, and having a first region that, at a side collision, is pushed by the outer panel and passes through the hole and pushes the inner pad toward the trim side, and a second region that, at a side collision, separates from the first region and pushes the inner pad toward the trim side via the inner panel.

Abstract: The present invention incorporates a tether release system within a conventional airbag system or a conventional vehicle occupant protection system. Release of an associated tether may simultaneously open a vent on an associated airbag. A housing contains an actuator contained within the housing for actuation of the tether release system upon receipt of a crash detection signal, for example. A first moving member is configured for receipt of a propulsive force emanating from the actuator upon actuation of the tether release system. A movable tether release member is contained within the housing wherein the movable tether release member operably communicates with the first moving member upon actuation of the tether release system, for release of an associated tether.

Abstract: A utility vehicle includes a front boarding section, a rear boarding section having a rear seat unit, a ROPS delimiting space including a front boarding space acting as a ride-in space of the front boarding section and a rear boarding space acting as a ride-in space of the rear boarding section, and a loading platform mounted rearward of the vehicle body. The ROPS includes a plurality of posts and an upper frame supported to the posts and delimiting upper space of the front boarding space and the rear boarding space. The loading platform is switchable between a first position in which a front end of the loading platform is positioned rearward of the rear boarding space and a second position in which the front end of the loading platform enters the rear boarding space.

Abstract: A steering apparatus includes an inner column, an outer column fitted onto the inner column, a vehicle body mounting bracket, a distance bracket fixed to the outer circumference of the outer column and slidably held between left and right side plates of the vehicle body mounting bracket, and a tightening rod. The distance bracket is formed with telescopic slots through which the tightening rod is inserted. The distance bracket includes left and right front tightening portions and left and right rear tightening portions. The axial distance between the pair of left and right front tightening portions and the pair of left and right rear tightening portions is shorter than the axial length of each telescopic slot. The outer column is formed with a pair of left and right through-holes into which the left and right front tightening portions or the left and right rear tightening portions is inserted.