Abstract: The disclosure relates to a scissors lifting device having a pair of scissors positioned between a carrier unit and a base unit. The scissors have inner arms and outer arms which can pivot in relation to each other about a scissors axle. The lifting device further includes a lifting truck that can be moved back and forth by means of a drive in order to open and close the scissors. According to the invention, a drive shaft that is oriented parallel to the scissors axle is coupled to the drive and enables at least one traction mechanism that is arranged around the drive shaft and is coupled to the lifting truck to be moved in both directions of rotation. This results in a construction having a reliable drive.

Abstract: An improved adjustable desktop that is portable and mobile, that supports current technological needs of users (e.g., computer equipment) and that provides for different ranges of height adjustment (e.g., low-to-the-floor for children and greater spacing from the floor for adults). The desktop includes a working area with an end portion, a vertically adjustable support member pivotably coupled to the end portion and a manual actuator coupled to the vertical support. The manual actuator is disposed above both the working area and the vertically adjustable portion of said vertical support member allowing for easy adjustment of the vertical height of the work surface.

Abstract: A ratchet-type lever mechanism for seat lifter, which comprises a brake unit whose shaft is connected with a mechanism of the seat lifter, two ratchet gear wheels provided about the shaft of brake unit, a shaft rotatable in a spaced-apart relation with the brake unit shaft, an operating lever connected with the shaft, and a sector ratchet gear element provided between the operating lever and two ratchet gear wheels. The sector ratchet gear element is so arranged in the lever mechanism to enable a user to rotate the operating lever in usual way without confusion about direction of rotation of the lever to cause upward and downward motions of the seat lifter. The sector ratchet gear element may be of an outwardly-toothed type having two outwardly toothed arcuate gear teeth and two sector gear portions, or may be of an inwardly-toothed type having two inwardly toothed arcuate gear teeth.

Abstract: A stopper structure for a seat lifter includes a stopper formed at another end of a connecting rod to abut on a connecting shaft when a cushion frame is located in a lifting limit position and a lowering limit position with respect to the base frame. When the cushion frame is located in the lifting limit position, the stopper restricts rotation of a sector gear in the direction of lifting the cushion frame with respect to the base frame. When the cushion frame is located in the lowering limit position, the stopper restricts rotation of the sector gear in the direction of lowering the cushion frame with respect to the base frame.

Abstract: A vertical movement apparatus for a vehicle seat includes a seat bracket supported on a seat member, a floor bracket adapted to be supported on a floor member, a link supported by the floor bracket to move the seat bracket in the vertical direction of the seat member, a driving member operatively connected to the link to drive the link and move the seat bracket in the vertical direction, and a link control mechanism. The link control mechanism includes an elongated hole located in either the seat bracket or the floor bracket, a pin operatively engaged with the other of the floor bracket or the seat bracket and slidably disposed within the elongated hole, and a depression portion located on the inside surface of the elongated hole to prevent the pin from sliding within the elongated hole.

Abstract: A height adjustable seat suspension having first and second bases connected by a linkage assembly with an air spring and shock disposed between the bases. The shock dampens vertical movement of the bases and the air spring increases in air volume to raise the seat height of the suspension and decreases in air volume to lower the seat height of the suspension. A threaded rod is also included as part of the shock which is threadably engaged with a collar that is rotated by a drive source. The engagement between the threaded portions of the rod and collar axially repositions the rod with respect to said collar to change the effective length of, the shock.

Abstract: A pneumatic motor vehicle seat, whose static height is held constant independently of the weight of the respective seat occupant. The inventive device provides a magnetically actuated air valve (16) which is enclosed 20 in a plastic valve housing for aerating and deaerating the pneumatic valve. The air valve is controlled by an external permanent magnet and according operates, quietly, cleanly and with little wear. Also a motor vehicle seat includes an integrated height adjustment mechanism, comprising a control system which automatically and simultaneously dampens the vehicle seat vibrations to a maximum, whilst the static height is being adjusted.

Abstract: An extended travel lift system including a support frame and a display device frame. First and second arms are connected at first ends thereof by a hinge connector. A second end of the first arm is pivotally attached to a first slide mechanism on the support frame and a second end of the second arm is pivotally attached to the support frame. Third and fourth arms are connected at first ends thereof by the hinge connector. A second end of the third arm is pivotally attached to a second slide mechanism on the display device frame and a second end of the fourth arm is pivotally attached to the display device frame. A biasing mechanism is provided to bias the display device frame to an extended position. A height control mechanism is provided to retain the display device frame in either a retracted position or the extended position. The first and second arms are typically located in a first plane and the third and fourth arms are located in a second plane parallel to the first plane.

Abstract: An actuator mechanism includes a attachment member fixed to a seat elevation adjuster and a controlling member placed between a driver member and the attachment member and can rotate together with an actuating lever. The driver member is located between the attachment member and a rotary member and fitted over a center shaft. There is formed a feed projection at one terminal portion of the driver member and its opposite terminal portion is placed face to face with a locking member. When the actuating lever is operated, the controlling member moves the driver member, which causes the locking member and the feed projection to engage with and disengage from the rotary member.

Abstract: A vertical movement apparatus for a vehicle seat includes a seat bracket supported on a seat member, a floor bracket adapted to be supported on a floor member, a link supported by the floor bracket to move the seat bracket in the vertical direction of the seat member, a driving member operatively connected to the link to drive the link and move the seat bracket in the vertical direction, and a link control mechanism. The link control mechanism includes an elongated hole located in either the seat bracket or the floor bracket, a pin operatively engaged with the other of the floor bracket or the seat bracket and slidably disposed within the elongated hole, and a depression portion located on the inside surface of the elongated hole to prevent the pin from sliding within the elongated hole.

Abstract: A sprung vehicle seat has a base member and a top member, and a scissor support assembly operatively disposed therebetween. The scissor support assembly comprises first and second pivotably interconnected scissor levers. Secured to the first scissor levers is a sliding guide in the form of a plate member which is oriented in the longitudinal direction of the seat. A spring member bears against the sliding guide and the top member and is displaceable in the longitudinal direction of the seat for the purposes of weight adjustment of the seat.

Abstract: Motor adjustable support device for the upholstery of a seat and/or of reclining furniture, especially suited for a bed mattress, including a base body having rails, and one adjustable support element adjustable relative to the base body. An adjusting device for the adjustment of the support device relative to the base body may be provided. One of the rails may be hollow or open on one side for receiving part of the adjusting device. The one adjustable element can be adjusted between a first adjustment position and a second adjustment position and that interacts with the support element, and that is received in the first adjustment position in a rail, or as viewed in a side view, for example, within the bounds of the rail, and that protrudes in the second adjustment position over the rail toward the support side.

Abstract: A flexible shaft is provided having at least one end portion connectable to a socket. The at least one end portion has a substantially uniform cross-section defining at least one generally flat side. The flat sides of adjacent cross-sections collectively define a non-planar surface which is twisted about a reference axis for rotationally driving a cooperating planar surface in the corresponding socket.

Abstract: A powered automotive seat. The powered automotive seat includes an upper seat frame and a lower seat frame. The upper seat frame is attached to the lower seat frame. The lower seat frame is attached to a suspension base assembly. The suspension base assembly includes a lower base mountable on the floor of an automotive vehicle, an upper base capable of receiving the lower seat frame and a pair of base arms attaching the upper base to the lower base. An air spring is attached between the upper base and the lower base. An automatic control unit selectively decreases and increases air pressure in the air spring. The air spring extends and contracts in response to changes in air pressure by the automatic control unit.

Abstract: Seat frame of an adjustable seat in a vehicle with a seat carrier having two side parts and one rear tie-bar, and provided with at least one transverse shaft for the transmission of an adjusting movement from one side of the seat to the other, said transverse shaft being borne in the two seat parts and having for each seat side an adjusting arm fastened on it. At least one side part is provided with a location recess—preferably open in its bottom part—and is freely receiving the transverse shaft 26, in the side part, beside the location recess, first fastener are provided and the transverse shaft is encompassed by a bearing part—preferably between the adjusting arms fastened on the shaft—, said bearing part bearing the transverse shaft 26, bridging the location recess and constituting second fastener corresponding to the first fastener.

Abstract: An automotive seat adjustment assembly adjusts a relative position of a seat cushion. The adjustment assembly comprises at least one front mounting bracket adapted for supporting a forward end of the seat cushion and at least one rear mounting bracket adapted fort supporting a rearward end of the seat cushion. At least one front seat support is movably mounted to the front mounting bracket and adapted for mounting to the forward end of the seat cushion. The front seat support is movable between a first position with the seat cushion in a lowered orientation and a second position with the seat cushion in a raised orientation. At least one rear seat support movably mounted to the rear mounting bracket and adapted for mounting to the rearward end of the seat cushion. The rear support is movable between a first position with the seat cushion in a lowered orientation and a second position with the seat cushion in a raised orientation.

Abstract: A seat lifter for height adjustment of vehicle seat, which has a lifter linkage for vertical movement of the seat and a drive mechanism therefor. The lifter linkage includes a pair of links, a bell crank portion formed in one of the two links, and a rotation transmission link element including a sector gear which is operatively connected with the bell crank portion. The drive mechanism comprises a ratchet-type lever mechanism operatively connected via a brake unit with the lifter linkage, the arrangement of which ratchet-type lever mechanism is such that only one-stroke operation of a lever causes a bifurcated ratchet pawl to rotate so as to bring a selected one of its two pawl portions to engagement with a ratchet gear wheel, thereby allowing for automatically selecting a desired operative direction without any switch-over operation and then continuously transmitting a certain amount of rotation force to the lifter linkage, so that the vehicle seat can easily be raised or lowered to a certain level.

Abstract: A seat lifter for height adjustment of vehicle seat, which has a lifter linkage for vertical movement of the seat and a drive mechanism therefor. The lifter linkage includes a pair of links, a bell crank portion formed in one of the two links, and a rotation transmission link element including a sector gear which is operatively connected with the bell crank portion.

Abstract: A vehicle seat, in particular an automobile seat, has a seat frame with a front part that is movable by means of an inclination adjuster relative to side panels of the seat frame. The inclination adjuster includes a shaft for the drive of the inclination adjuster. The shaft is arranged with a play relative to one side panel.

Abstract: A height adjusting device for a lengthwise adjustable vehicle seat is provided. Pivotal control arm units are provided at front and rear position of a vehicle seat to raise and lower the seat in dependance on their rotative position Link assembles, including front and rear coupling arms pivotally connected by an intermediate joint connect the front and rear control arm units.

Abstract: A vehicle seat assembly includes a seat bottom and a seat back supported for movement relative to the seat bottom such that seat position can be adjusted forwardly or rearwardly with respect to the vehicle. The seat assembly is mounted to a vehicle structure and includes a first track and a second track supported for movement relative to the first track with the seat bottom being supported on the second track for movement with the second track. A support member presents a bearing surface that rotatably engages a bearing surface on the second track. At least one adjustment link is used to interconnect the support member and the seat bottom. The adjustment link is mounted on the support member for rotation therewith to provide vertical seat adjustment. A torque tube engages the support member to provide rotational input to the adjustment link.

Abstract: A seat cushion assembly includes a seat cushion frame operatively coupled to a seat track assembly by a seat cushion height adjuster for selectively positioning the seat cushion frame between a raised position and a lowered position. The seat cushion height adjuster includes front pivot shaft and rear pivot shaft journaled to the seat track assembly. A front pair of pivot links pivotally interconnect the seat cushion frame to the front pivot shaft and a rear pair of pivot links pivotally interconnect the seat cushion frame to the rear pivot shaft. A horizontal link interconnects each of the pairs of front and rear pivot links for synchronized movement. The adjuster further includes a powered drive assembly having a motor and gear box supported by a motor bracket between the front and rear pivot shafts for driving a screw shaft. A screw nut is threadedly coupled to the screw shaft for movement therealong.

Abstract: A seat suspension method in one approach involves applying a dampening force over less than the full range over which a seat may be raised and lowered by a seat height adjuster. The step of applying a dampening force may comprise applying such a force which varies non-linearly, depending upon the extent a seat moves as a result of seat vibration. In several specific approaches, unlatching of the dampening mechanism may be accomplished to permit relative movement of the seat and seat support mechanism during seat height adjustment. Relatching of the vibration damper may be accomplished to again apply a dampening force. The seat may automatically be returned toward a desired elevation in the event loading on the seat is varied, for example if a seat occupant leaves the seat.

Abstract: A seat vertical positioning device for a vehicle seat includes a seat side member supported by the vehicle seat, a bracket fixed to a vehicle floor side member and a link having on end pivotally connected with the bracket at a first pivot point and another end pivotally connected with the seat side member at a second pivot point. The seat vertical positioning device further includes a pin for moving the first pivot point of the link relative to the bracket when the seat side member receives a load which exceeds a predetermined value. A plurality of recesses are formed on the bracket at a position separated from the first pivot point, and a lock pin is fixed to the link and engageable with the recesses when the pivot point of the link is moved.

Abstract: A seat platform for industrial and agricultural vehicles capable of supporting a seat for forward and rearward movement characterized by low cost and ease of assembly of a seat mount plate with a base plate wherein linear tracks defined on the seat mount plate cooperate with linear guides formed on the base plate.

Abstract: A vehicle seat assembly includes a seat back that is supported with respect to a seat bottom. The seat bottom is supported on a track assembly that includes a seat adjuster for controlling movement of the seat back and bottom. The seat adjuster can move the seat in horizontal and/or vertical directions and can also be used to adjust the tilt of the seat. An electric motor is used to drive the seat adjuster. The motor supports a first connector and the seat adjuster supports a second connector. A flexible shaft is used to interconnect the first and second connectors to transmit power from the motor to the adjuster. The shaft has a first end and a second end with each of the ends defined by a helical body portion. The first connector and the first end are mated to interconnect the motor and the shaft and the second connector and the second end are mated to interconnect the seat adjuster and the shaft.

Abstract: A lead screw which is to be moved in a direction. A nut is screwed to the lead screw. A first bracket is to be swung by moving the lead screw so as to move a seat up and down. The first bracket has a first opening. The nut is fitted in the first opening. A second bracket is to move the seat up and down with the first bracket. The second bracket has a second opening of a size larger than that of the first opening. The second opening is to pass the nut in an inclined position therethrough. The second opening is to position the nut therein.

Abstract: An automotive power seat sliding device comprises first and second lower rails secured to a vehicle floor; first and second upper rails slidably and respectively engaged with the first and second lower rails and supporting thereon a seat; a cross beam member having both ends secured to the first and second upper rails respectively, so that the first and second upper rails slide on and along the first and second lower rails like a single unit; a drive shaft extending along the first upper rail and having a spiral groove formed therearound; a nut member secured to the first lower rail and operatively engaged with the drive shaft; an electric power unit supported by the cross beam member for rotating the drive shaft about an axis thereof; a supporting member connected to the first upper rail for rotatably supporting one end portion of the drive shaft; and a protector bracket secured to the first upper rail and having a recessed structure into which the other end of the drive shaft is received without contacting

Abstract: A seat lifter device for a vehicle includes a reduction gear mechanism which is disposed between an operating member and a link which is adapted to be pivoted to raise and lower the vehicle seat. The reduction gear mechanism is mounted on a shaft and a spring is provided for assisting the rotation of a shaft on which the reduction gear mechanism is supported.

Abstract: To promote strength of lower arms for coupling rail members and a seat frame, each of the lower arms (4) is installed with a bead portion (21), a first recess portion (24) and a flat face portion (23) and the first recess portion (24) is made to be freely brought into contact with a projected portion (25) of an upper rail (3).

Abstract: A vehicle seat provided with a seat cushion the support frame of which is supported by a suspension mechanism, wherein the suspension mechanism includes a torsion bar spring loaded to resiliently support the support frame of the seat cushion, and wherein a spring adjustment mechanism is assembled with the suspension mechanism for adjusting the resilient force of the torsion bar spring.

Abstract: A vertical movement apparatus for a vehicle seat includes a seat bracket supported on a seat member, a floor bracket adapted to be supported on a floor member, a link supported by the floor bracket to move the seat bracket in the vertical direction of the seat member, a driving member operatively connected to the link to drive the link and move the seat bracket in the vertical direction, and a link control mechanism. The link control mechanism includes an elongated hole located in either the seat bracket or the floor bracket, a pin operatively engaged with the other of the floor bracket or the seat bracket and slidably disposed within the elongated hole, and a depression portion located on the inside surface of the elongated hole to prevent the pin from sliding within the elongated hole.

Abstract: A seat support includes first and second link members coupling a seat supporting member to a base. The second link member has a first end portion pivoted to the base at a first pivot axis and a second end portion pivoted to the seat supporting member at a second pivot axis. The first link member has a first end portion pivoted to the base at a third pivot axis and a second end portion pivoted to the seat supporting member at a fourth pivot axis. The distance between the third and fourth pivot axes is greater than the distance between the first and second pivot axes and may be from about twelve percent to about twenty percent greater. The location of the pivot axes may be expressed by the formula L<(S+R−B). In this formula, L is the distance between the first and second pivot axes; S is the distance between the second and fourth pivot axes; R is the distance between the third and fourth pivot axes; and B is the distance between the first and third pivot axes.

Abstract: A linkage assembly is used to vertically adjust the position of a seat. The linkage assembly includes a first link that is connected to a second link without the use of fasteners. The first link has a first mounting portion and the second link has a second mounting portion. The first mounting portion is deformed into engagement with the second mounting portion to rotatably connect the first link to the second link. In one embodiment, the first mounting portion is an extrusion that extends through an aperture in the second link. An end of the extrusion is deformed into engagement with the second link to form a lip to lock the first link to the second link and allow relative rotational movement between the first and second links while eliminating relative linear movement therebetween. In an alternative embodiment, portions of the first and second links are deformed into locking engagement.

Abstract: An improved seat suspension system including, in combination, an air spring and shock absorber, which comprise an air spring member and a shock absorber member, respectively. The air spring member and shock absorber member are longitudinally coupled to provide support and damping along a longitudinal axis. The air spring member and shock absorber member are coupled in a manner that enables them to be readily separated and independently serviced. A seat suspension also comprises a seat moveably coupled to a seat base that has a support structure. The combination air spring and shock absorber is interposed between the seat and the seat base to govern relative motion between the seat and the seat base. The combination air spring and shock absorber is rotationally coupled at each end to allow angular motion between the longitudinal axis of the combination air spring and shock absorber and the centerline of the seat.

Abstract: A seat suspension system controller is described for controlling both the latching and unlatching of a seat and seat height adjustment when the seat is unlatched. In one embodiment, the seat suspension controller is a valve actuated by a common lever to control a latch to unlatch and latch the seat and also to control seat height adjustment when the seat is unlatched. The lever may be oriented to unlatch the seat and raise the seat height when the lever is raised and to unlatch the seat and lower the seat height when the lever is lowered.

Abstract: A child seat has an upper base section (1) and a lower base section (201) for changing an inclination angle between these base sections. The upper base section 1 and the lower base section (201) are journaled rotatably about a common journal axis (201A) at the front portion of the base. At a rear end side, an inclination angle changing mechanism (200) is installed for adjusting a spacing between the upper base section (1) and the lower base section (201) opposite the journal axis (201A). This structure provides a child seat allowing adjustment of the angle of inclination of a support surface supporting a child even if the child supporting surface extends lengthwise of a passenger car seat to which the base formed by the two base sections 1 and 201, is attached. This leveling of the child supporting surface is possible if the child seat (2) is rotatable about a vertical axis relative to its base.

Abstract: A support device comprising two superposed platforms connected by two electrically controlled jacks of adjustable length and by an upright of constant length forming on these platforms the apices of triangles, device characterized in that the jacks and the upright are rigidly fixed on one of the platforms, so-called upper platform, by an articulation assembly comprising a universal joint and a pivot pin, each pivot pin being located parallel to the opposite side of the triangle defined on this platform.

Abstract: The present invention provides a barber/beauty chair which can freely set the lowest position and a movable area of an ascendable/descendable seat part as well as hoist and lower the seat part horizontally without displacement of the center position of the seat part. The barber/beauty chair according to the present invention comprises a hoisting/lowering mechanism which is constituted by a frame 31 stood on a base, a link bracket 31, a pedestal part 33 for supporting a seat part 24, a first parallel link 50 having one end attached to the frame 31 and the other end attached to the link bracket 32, a second parallel link 60 having one end attached to the pedestal part 33 and the other end attached to the link bracket 32, a third link rod 70 for connecting the first parallel link 50 and the second parallel link 60, and an oil hydraulic cylinder 80 connected to the second parallel link 60.

Abstract: A seat assembly for vehicles such as lawn and garden tractors comprises a base for attachment to the vehicle. The base includes an axle to which a first support plate is pivotally mounted. The first support plate includes a pair of channels. A corresponding pair of runners may be slidably attached to the channels in relative back and forth movement. A second support plate is attached to the runners and is movable therewith. A seat is pivotally attached to a third support plate. An air spring is mounted between the second and third support plates for restricting the movement of the second and third plates toward one another. A pair of struts extend between the second and third support plates for providing relative up and down movement therebetween as the air spring is compressed or expanded during use.

Abstract: A manual adjustment assembly for adjusting the height of a vehicle seat includes mounting brackets for supporting a seat bottom that is movable between a lowered position and a raised position. Separate adjustment assemblies can be installed at the front and rear portions of the seat for adjusting the height of the front portion independently from the rear portion. Or, a single adjustment assembly can be used to adjust the height of either the front or rear portion where the adjustment assembly includes a connecting linkage assembly to correspondingly adjust the height of the other portion of the seat bottom. The adjustment assembly includes a torque tube extends between the mounting brackets and is actuated by an actuator that selectively supplies rotational input to the torque tube. A drive link is supported on one end of the torque tube and is fixed for rotation with the torque tube as the tube receives input from the actuator.

Abstract: A power seat device includes a lifting mechanism having a rocking member for moving a seat cushion up and down, an axially movable screw member retained at its one end by the rocking member, and a housing box provided with a gear mechanism for reducing the revolution of a motor to move the screw member axially. The power seat device is also provided with a holding member for retaining and holding the housing box.

Abstract: A height adjustable mechanism for supporting a work support for vertical movement relative to a base includes a counterbalance mechanism for providing a force opposing a downward force tending to lower the work support; a lock mechanism for releasably retaining the work support in a desired vertical position; and a manual operator for selectively releasing the lock mechanism to permit vertical movement of the work surface, while preventing operation of the lock mechanism if the counterbalance force and the downward force are out of balance by some given extent. In the preferred construction, the lock mechanism is pivotally supported by a pin normally supported for axial sliding movement under the control of the manual operator, and the lock mechanism applies loading to the pin, when the counterbalance force substantially differs from the downward force, sufficient to constrain the pin against sliding movement, and thereby prevent release of the lock mechanism by the manual operator.

Abstract: A simple system for mechanically lifting and securing a machine to vibration isolators. The system is unitary, compact, occupies space only under the machine and not protruding from the sides and allows the machine to be completely detached for servicing. The system includes a four bar linkage using two square supporting members as a chassie with the four bar linkage being mounted to vibration isolators that are welded to support plate. The four bar linkage is manipulated by two screws to easily and quickly raise the machine off its casters and restrain it in a fixed position. The two screws make detachment from the four bar linkage a simple and time efficient process for repairpersons.

Abstract: A percussion bell support includes a base connected to the bell head end, a jaw swingably attached to the base, surfaces on the base and jaw to clamp to a support member, when the jaw is swung toward the base and head end of the bell, a connector shank passing through the jaw and into the base, and a handle, the jaw remaining between the handle and base during swinging of the jaw and during handle and shank rotation to tighten the jaw and base to the support member.

Abstract: A vehicle seat suspension system is provided which includes, in a seat support comprising an upper housing and a lower housing and a scissors linkage support apparatus, a spring fixed to the upper housing and a cable attached to the spring and wrapping around a pulley attached to the upper housing and downwardly to an arcuate or eccentric pulley attached at the scissors linkage axis pivot and an actuator knob which allows a seat occupant to tighten or loosen the cable and raise or lower the seat to provide a vehicle seat suspension system. The present invention provides a suspension system which can be discreetly and infinitely adjustable and which allows a user to adjust the suspension curve characteristics of the seat by utilizing a non-circular drive pulley which is movably adjustable.

Abstract: A linkage assembly for use with kinetic mechanisms such as an automotive seat assembly having an elongated torsion rod made of either a solid bar or a hollow cylindrical tube, and at least one linkage member having an aperture corresponding to the cross-sectional profile of the torsion rod and adapted to receive the torsion rod therethrough. The linkage member includes an essentially flat sheet of metal extending from and coplanar to the aperture and an outwardly extending extruded metal flange which projects upward from the flat surface of the linkage member. The extruded flange defines a sleeve through which the torsion member extends. A weld seam is located at the terminal end of the flange in attaching contact between the torsion rod and the flange to form a secure union between the two members.

Abstract: A mechanical seat suspension between upper and lower supports comprises a scissors arms linkage and a support pivot assembly allowing height adjustment to multiple positions. The pivot assembly carries most of the seat load and comprises a pair of lever arms, a pair of bell cranks, a height adjustment latch including multiple height adjustment detents, a pair of latch supports and a pair of tension springs to provide height-adjustable suspension. The seat suspension also preferably includes a damper such as a shock absorber. The latch includes a plurality of detents which alternatively work to adjust the height of the seat. A moveable pin is disposed within the latch support to engage a detent of the latch to establish the adjustable height of the seat. The moveable pin is moved into a disengagement position by lifting the seat to its maximum raised position whereby an abutment surface on the latch forces the moveable pin rearward.

Abstract: In the operation of a construction machine, various forces are exerted on a seat which are dampened by a shock absorber. A seat suspension mechanism is provided between the seat and the shock absorber for coordinating the movement of the seat. The seat suspension system has first and second pairs of link arms arranged on opposite sides of the seat. The first and second pairs of link arms each have a controller and follower arm which are pivotally joined substantially at a midpoint therealong. A first end of the controller arms are fixedly mounted for pivotally movement to the front portion of the base with a second end fixedly mounted for pivotally movement to the rear portion of the seat to provide movement along an arcuate path in response to the plurality of forces exerted during operation of the machine.

Abstract: A vehicle seat suspension having a scissors arm linkage disposed between a platform and base with a link pivotally connected at one end to a scissor arm of the linkage at a point spaced from a pivot interconnecting scissor arms of the linkage and operably connected at its other end to a slide carried by the platform for communicating scissor linkage motion to a spring carrier also connected to the link. The carrier includes at least one coil spring held captive preferably in compression between two spaced apart brackets, one of which is pivotally connected to the end of the link adjacent the slide. The point of pivotal attachment of the link to the scissor arm is spaced from the linkage pivot to create a moment about the pivot tending to resist collapse of the linkage when force from the spring is communicated to the linkage.