Abstract: A device for cushioning shocks is provided. A relatively unstable, collapsible elastomeric member which has guides integrally formed thereon, is surrounded by a guide sleeve which provides controlled deflection as well as damping for the elastomeric member. A piston is used to collapse the elastomeric member. The cush of the present invention can be utilized in hydraulic systems where an elastomeric bladder provides primary energy storage and in other applications where the cush of the present invention is the primary damper. This cush can be preloaded and, where desired, can be provided with the capability to adjust the preload.

Abstract: A support stand, support stand assembly, and method of making the same with the support stand featuring a base with central hub-like reception area either capped or uncapped at its bottom and a supporting rod that has a diameter less than that of the side wall defining the reception area so as to form an annular gap. An elastomer material, which is preferably a liquid urethane that cures at room temperature, is poured into the gap so as to form an energy management member which acts as a flexible cushioning element by helping to dampen and diffuse rocking forces of the supporting rod with respect to the base. The energy management member also acts to glue the supporting rod to the base through the bonding properties.

Abstract: A vehicle seat suspension includes a bottom frame adapted to be mounted on the vehicle and a top frame located above the bottom frame and adapted to support a seat thereon. A substantially fully collapsible scissors linkage is interconnected between the bottom frame and the top frame enabling the bottom frame and the top frame to move relative to each other substantially in parallelism. A biasing arrangement is disposed between the top frame and the bottom frame and has a preload force urging the top frame away from the bottom frame. A first adjustment mechanism is located in the top frame and selectively enables fore and aft adjustment of the top frame relative to the bottom frame.

Abstract: A vehicle seat suspension includes a bottom frame adapted to be mounted on the vehicle and a top frame located above the bottom frame and adapted to support a seat thereon. A substantially fully collapsible scissors linkage is interconnected between the bottom frame and the top frame enabling the bottom frame and the top frame to move relative to each other substantially in parallelism. A biasing arrangement is disposed between the top frame and the bottom frame and has a preload force urging the top frame away from the bottom frame. A first adjustment mechanism is located in the top frame and selectively enables fore and aft adjustment of the top frame relative to the bottom frame.

Abstract: The present apparatus comprises a manually adjustable tilt control mechanism which permits adjustable control of the front to back tilt of a chair assembly on a support frame, including a chair assembly having a lowermost seat portion, a column and forwardly extending support arm, for supporting the chair seat portion, a pair of dissimilarly sized resilient blocks, disposed between the end of the support arm and the bottom side of the chair seat portion. The resilient blocks may be adjustably compressed or decompressed between the bottom of the seat portion and the support arm, to adjust the tiltability of the seat.

Abstract: A bearing system for a part of a railroad track, such as a rail-fastening or ribbed slab (10), supported by elastic elements on, for example, a railroad sleeper. The elastic elements form a spring system with a kinked characteristic curve such that when the spring system is subjected to force that is smaller than the forces active in the operative range (16) of the spring system, the characteristic curve rises steeply and, in the operative range (16), runs flat.

Abstract: In order that the acceleration suffered by the occupant (O) of an aircraft, particularly a rotary-wing aircraft seat in the case of an accident remains below a humanly withstandable limit, no matter what the size of said occupant, a seat is proposed in which a height regulation of the pan or bucket (16), in which the occupant is received, also has the effect of modifying the inclination of the energy absorbers (38). Thus, the vertical component of the retaining force exerted on the pan (16) by said absorbers decreases with the size of the occupant, which leads to the desired result.

Abstract: An adjustment mechanism for adjusting the height of a chair seat, table top or the relative position of other items includes an outer support tube and a telescoping, column tube subassembly. The column tube subassembly includes an inner support tube, a cylinder and a piston and piston rod subassembly. The piston rod is connected to the piston at one end and to the outer support tube at the other end. An elastomeric sleeve surrounds the cylinder. A valve controls flow of hydraulic fluid from the interior of the cylinder to and from an expandable chamber defined by the elastomeric sleeve. The piston snap-fits onto the piston rod and allows rotation of the column tube subassembly with respect to the outer support tube. A shock-absorbing element is disposed in the cylinder.

Abstract: Described is a seat (10) having a spring means (36) with which the springing characteristic of the seat (10) can be adjusted as desired. For that purpose a two-armed pivot lever (38) is provided on a back element (34) of the seat (10) at least approximately horizontally and is pivotable about a central mounting axis (40). At least one at least approximately horizontally arranged tension spring (48) is fixed by its one end portion (50) to the one arm (44) of the pivot lever (38), the second end portion (54) of the tension spring (48) being fixed to a fixing portion (56) of a support lever (58). The fixing portion (56) is at least approximately aligned with the mounting axis (40). The support lever (58) is mounted pivotably to the back element (34) and is pivotally connected by its fixing portion (56) to a scissor element (18) of a scissor support assembly (16).

Abstract: Mechanism for movably supporting a load, comprises a fixed frame, a pendulum lever pivotally connected at one end to the frame, and a link pivotally connected at one end to the other end of the pendulum lever. The other end of the link is connected to a vertically movable load support. A gas spring is pivotally interconnected between the frame and the link at points spaced from the points of articulation of the link and pendulum lever to the frame and to each other. Provision is made for adjusting the position of the pivotal connection between the link and the gas spring lengthwise of the link, and for adjusting the position of the pivotal connection of the gas spring to the frame in a direction toward or away from the point of articulation of the pendulum lever to the frame. Guides for the load are provided, comprising rollers mounted on the frame in between which a vertical member slides vertically.

Abstract: An adjustable keyboard support includes a rigid support arm, and a keyboard support pivotally connected to the rigid support arm at a joint comprised of a ball and seat arrangement. The joint includes a retainer that both holds the ball on the seat and further adjustably frictionally engages the ball to resist the rotation of the keyboard support with respect to the support arm during keyboard manipulation. The adjustable keyboard support further includes a mounting bracket slideably and pivotally connected to an associated worksurface, permitting the keyboard to be moved between a raised use position and a retracted storage position. A lift assist is provided to counterbalancing support the weight of a keyboard placed on the keyboard support, and in the preferred embodiment is comprised of a self locking gas strut that automatically locks the arm in a given position. The gas strut attaches to a bracket that can be adjustably moved between high lift force and low lift force positions.

Abstract: A seating device for aged, infirm and handicapped persons includes a passive, pivotably mounted, energy storage device laterally disposed below a seat base, and a parallelogram linkage between the seat base and a chair seat for controlling elevation and tilting motion of the seat. A lever which can be coupled at selectable points along an arc about the pivot point of the energy storage device exerts torque on the parallelogram linkage to oppose downward movement and aid upward movement. By varying the position of engagement of the energy storage device to the lever, the force exerted can be adjusted to the weight of the user.

Abstract: A resilient pressurized fluid articulation is disclosed which has variable stiffness, i.e. whose stiffness may be modified at will under the influence of an external agent. The articulation includes a resilient material block (5, 5a; 15, 15a) mounted between rigid bearing surfaces of a structure (7, 7a, 7b, 7c) which contains it. At least two of these surfaces of the block are movable with respect to each other in at least one direction, under the action of external forces acting in this direction. The resilient material block (5, 5a; 15, 15a) defines in the structure at least one chamber (3) adapted to be fed with pressurized fluid through a duct (2) opening to the outside. The block (3) also comprises at least one part (18, 18a) which is deformable under the effect of the pressure, deformation of the part then modifying the stiffness of the block in the direction.

Abstract: A mechanical seat suspension inside a housing comprises parallel scissor arms and a support arm with a cam connected to suspension springs. The support arm, which carries the substantial majority of the seat load, has a height adjustment mechanism and a cam with two arcuate surfaces that define an imaginary pivot point. The use of the cam with the imaginary pivot point permits a more compact structure. Various embodiments of the support arm with a cam end and devices using the support arm are also disclosed. A shock absorber attached to the outside of the scissor arms dampens the stroke of the suspension springs connected to the cam. The ratio of the shock stroke travel to the vertical movement of the seat remains generally linear and constant, thus producing a more comfortable ride. Also included is a height adjustment mechanism on the support arm that interlocks with the cam by a pivoting pawl and biasing spring.

Abstract: A bathing unit which includes a vertically adjustable bottom portion and fluid receiving channels. The lift mechanism includes a spring and manual spring tension adjuster. The user is able to adjust the spring so that the platform moves when the weight of the user plus the weight of the water in the channels is greater or less than the preset spring force.

Abstract: There is disclosed an upholstered article of furniture in the form of a pouffe (10) which comprises a base (11), a single scrap rubber tire, or a stack of rubber tires, mounted generally horizontally on the base, upholstery (13), and padding (14) arranged at predetermined locations between the tire and the upholstery.

Abstract: A mechanical seat suspension inside a housing comprises parallel scissor arms and a support arm with a cam connected to suspension springs. The support arm, which carries the substantial majority of the seat load, has a height adjustment means and a cam with two arcuate surfaces that define an imaginary pivot point. The use of the cam with the imaginary pivot point permits a more compact structure. Various embodiments of the support arm with a cam end and devices using the support arm are also disclosed. A shock absorber attached to the outside of the scissor arms dampens the stroke of the suspension springs connected to the cam. The ratio of the shock stroke travel to the vertical movement of the seat remains generally linear and constant, thus producing a more comfortable ride. Also included is a height adjustment mechanism on the support arm that interlocks with the cam by a pivoting pawl and biasing spring.

Abstract: A seat support mechanism for a tiltable chair having a rear tilt torque mechanism including interconnected torsion bars which are adjustable to vary the resilient restraining force which opposes rearward tilt of the seat when occupied, a detent mechanism which provides additional detent and stability to maintain the seat in its normal upright position and add to the resistance of the torque mechanism, and an adjustment mechanism for adjusting said detent mechanism for front tilt.

Abstract: A seat suspension device which comprises an upper frame, a lower frame, a pair of linkage mechanisms provided between the upper and lower frames, and a torsion bar which elastically supports the seat upon the suspension device. The torsion bar is so arranged that it extends along the lateral bar section of one of the upper and lower frames, with its support end portion being secured at the other of the upper and lower frames, so as to resiliently support the upper frame. Further, the linkage mechanisms have downwardly arced upper portions in each of their links. Thus, these structures permit the lowering of the upper frame or the seat down to a lowest possible degree without interference of the parts of the linkage mechanisms and torsion bar.

Abstract: A knee-action chair control for a pedestal chair base comprises a base plate, a seat support plate pivotally mounted on the front of the base plate, a pair of compression springs operable between the plates for biasing the seat support plate toward an at-rest position relative to the base plate, and a novel adjustable spring preload mechanism operable between the base plate and one end of the compression springs. Additonally, there is an assembly locking plate removably mounted on the seat plate and engageable with the base plate for determining the at-rest position of the seat plate. Removal of the assembly locking plate during assembly of the control enables the compression springs and spring preload mechanism to be assembled without precompression of the springs.

Abstract: A seat suspension device including an elastic biasing mechanism for elastically biasing a seat frame away from a lower base frame, a locking mechanism for locking the seat frame to thereby place the seat suspension device in a locked state, and a biasing force adjustment mechanism for adjusting the biasing force of the elastic biasing mechanism. The locking mechanism is so arranged that it will bring to a locked state the seat suspension device when the biasing force of the elastic biasing mechanism is reduced to a lowest degree by operation of the biasing force adjustment mechanism. Accordingly, by merely operating the biasing force adjustment mechanism, both biasing force adjustment and locking/unlocking operation are effected.

Abstract: A counterbalancing mechanism allows a weight or constant force to be counterbalanced for any practical linear range of travel, including means for effortlessly adjusting the mechanism for a constant force or load of any practical magnitude. A load support slides along an axis substantially passing through a fixed lower pivot point. The load support member is pivotally connected to the top end of an upper lever arm. The upper lever arm is pivotally connected by a horizontal link to the upper end of a lower lever arm that is pivotally connected to the fixed point. A pully that may swivel about its swivel axis embraces the axis and guides a cable connected to the horizontal link at one end to a spring assembly at the other end. The spring assembly may be adjusted.

Abstract: A suspension system has a base, mountable to the floor of a vehicle, and a frame above the base. The base and frame are coupled by a linkage, for example two, spaced pairs of crossed links. A mechanical spring, preferably in the form of a torsion bar, is mounted in one of the base and frame. A lever is coupled to the spring means. A roller assembly mounted in the links is movable along the lever arm to vary its length and to act as a fulcrum. The lever has a cam lobe so that movement of the roller assembly arcuately moves the torsion bar to preload same, as the length of the lever arm is altered. Varying the length of the lever arm and the preloading of the spring responsive to differing occupant's weights maintains constant natural frequency and centers the suspension system in the ride zone.

Abstract: A manually adjustable tilt control mechanism for a seat assembly arranged upon a frame support. The tilt control mechanism comprises a resilient block of material adjustably disposed between a pair of plates which are connected by a longitudinally adjustable bolt. Manual rotation of an adjustment knob effectuates compression or decompression of the resilient block between the upper and lower plates. The chain assembly being attached to the upper plate is infinitely tiltable in a full range from front to back and side to side, or any combination thereof, depending upon how much the resiliency of the block is permitted by its compression between the upper and lower plates.

Abstract: A lifting seat device having a lifting arm coupled to or adapted to be coupled to a seat member and a mechanism for controlling the angular position of the lifting arm to assist in lowering and raising the seat member, the lowering and raising mechanism comprising a compression spring enclosed within a housing and whose compression is arranged to be increased upon the lifting arm being angularly displaced as a result of a user sitting on said seat member, there being means enabling the spring to be adjustably pre-stressed to enable the load/displacement characteristics of the lifting arm to be adjusted and preselected. The lifting arm can be selectively separable from the lowering and raising mechanism so that when the lifting arm is removed from or is repositioned in the mechanism, the seat can be used in a conventional, non-lifting mode.

Abstract: A chair, particularly a work chair, includes a mounting plate for fastening a seat and back member. The mounting plate is supported so as to be pivotable with its front end about a horizontally extending axis on a support member which is, in turn, supported by a vertically extending, essentially vertically adjustable support tube and projects laterally relative to the support tube. The mounting plate is supported on its side facing away from the pivoting axis and near the seat and back member by a gas pressure spring. The gas pressure spring has at one end thereof a valve tarppet for operating a valve which is integrated in the gas pressure spring, so that the effective length of the gas pressure spring is adjustable. The end of the gas pressure spring with the valve tappet is supported on the support member. A two-armed lever which acts on the valve tappet is pivotally mounted on a bearing block of the support member which bearing block supports the gas pressure spring.

Abstract: The seat and pedestal of a chair are joined by a knee-tilt control mechanism which includes a first support fixed to the underside of the seat adjacent the front edge thereof, and a second support fixed to the upper end of the pedestal and having a sidewardly extending tube. The first support has bearing hubs which are rotatably engaged with the tube to define a horizontal tilt axis. A restoring mechanism is disposed within the tube for exerting a restoring torque urging the seat upwardly into a horizontal position. The restoring mechanism employs compression springs within the tube on axially opposite sides of a pre-torque member which can be rotated to adjust the initial spring compression. The springs bear against actuators which rotate with the bearing hubs. The actuators have radially projecting followers for engagment with ramp-like cams formed circumferentially of the tube.

Abstract: An improved vibration damping bellows mount or interconnection is disclosed. In one aspect, the bellows is compressively prestressed along its length to offset vacuum-generated tensile loads and thereby improve vibration damping characteristics.

Abstract: A cushioning mechanism suitable for use with an office chair is disclosed. A seat frame is connected pivotally to the front of a support frame for swinging motion about the pivotal connection. The swinging motion of the seat frame is converted into the translation thereof by means of a link mechanism, and thus a cushioning member such as a coil spring incorporated in the support frame is compressed by the translation of the seat frame. Accordingly, even when the seat portion is made to swing by a large degree, the front of the seat portion is not greatly shifted in height, thereby enabling the user to sit in the chair comfortably.

Abstract: A central pivot rocker spring assembly for connecting a base to a lower frame member in a reclining chair with a rocking feature so that the lower frame member pivots about a single axis of rotation. The spring assembly includes a first bracket mountable to the base, a second bracket mountable to the lower frame member and pivot pins securing the brackets together on the axis of rotation. A leaf spring biases the first and second brackets to selected relative positions. The leaf spring passes through and is fixed in position at its center on the axis of rotation. Thumbscrews coupling the leaf spring to the second bracket permit independent adjustment of the forward and backward rocking motions of the chair. The thumbscrews are movable to permit wide variations in biasing forces.

Abstract: A seat suspension device for use in an automotive seat which comprises a pair of right and left X-shaped links for connecting a lower frame with an upper frame and a torsion bar journaled to the pivotally-connected portions of the two X-shaped links. The torsion bar includes two ends, with one end thereof being engaged with one of the X-shaped links and the other end engaged with the other X-shaped link, so that the upper frame can be supported resiliently relative to the lower frame.

Abstract: A movable open center mounting for the tool of an ultrasonic wire bonding machine employs ball-bearing rollers (22, 24, 30, 32) to permit limited motion of the wire bonding tip (13a) substantially constrained to a vertical line with a minimum of tip skid. The mounting structure which is all positioned on one side of the tool tip includes a frame (10) of inverted U-shape having a pair of mutually spaced ball-bearing rollers (22, 24, 30, 32) on the end of each frame leg and a transducer support (12) positioned between the frame legs and having fixed roller contacting rods (90, 92, 96, 98) extending fore-and-aft between and partly under each of the respective rollers.

Abstract: The spring-tilt mechanism comprises a support frame (4), a seat portion (1) tiltable on the support frame (4) about a substantially horizontal axis (2) between a first and a second position, e.g. defined by stops (13, 13'). One end (15') of a torsion spring (15) is fixed against rotation in the support frame (4). A gear box (16) is operatively engaged with the other end (15") of the torsion spring (15) and has an extendible member (24) engageable with a tracking surface (31) of the seat portion (1). An operating member (29) on the gear box (17) is easily accessible to a user sitting on the seat portion (1) to pre-load the torsion spring (15) for cushioning the user on the seat portion (1) between the said first and second positions (stops 13, 13').

Abstract: A weight adjustment support device for a vehicle seat such as an automotive seat is disclosed which is capable of adjusting the cushioning property of the seat according to weights or taste of an occupant. The device includes a mounting frame and a seat supporting frame on which the seat is placed. A pair of X-shaped expansion legs are provided between the two frames to be able to raise or fall the seat supporting frame vertically. A pair of wedge members are provided to secure one end of the expansion leg via elastic means. The two wedge members are combined such that the slanting surface of one wedge member having a grade is applied against the slanting surface of the other wedge member having the same but oppositely directed grade. The one wedge member is then moved by means of a feed mechanism to vary the distance between the respective bottom surfaces of the two wedge members so as to be able to adjust the energizing forces of the elastic means.

Abstract: Viscoelastic damping material (45, 80 and 105) effectively damps the resonant responses of a mirror (10) and a mount (12) therefor to vibratory disturbances thereof by such phenomena as pressure pulses in a pulsed chemical laser cavity.

Abstract: The invention relates to a device for sprung tilting movement of a component such as an inclining mechanism for a tiltable seat. The spring system is formed by at least one spring rod which is rotatably mounted in at least two bearings of which one bearing is stationary in the operating state while the other bearing is rotatable about an axis spatially offset relative to the axis of the spring rod. This results in a simple, light and space-saving construction.

Abstract: A spring for creating adjustable torsional resistance between two members which are pivotal relative to each other. The spring comprises a stack of axially aligned elastomer torsion rings (30). A locking ring (34) is secured to and separates adjacent torsion rings, one locking ring being associated with each torsion ring. The assembled stack is firmly attached to one of the pivotal members (14). There is connecting sleeve (46) engageable selectively with each locking ring and with the other relatively pivotal member. The number of torsion rings exposed to pivotal motion between the members to vary the torsional resistance of the spring is determined by engagement between the connecting sleeve and selected locking rings.

Abstract: An improved vertical adjustment device for use with a seat in a vehicle such as an automobile is disclosed which is capable to adjust the cushioning function of such seat. In this vertical adjustment device, a cam with an operation lever is cooperatively connected with the sliding portions of a pair of X-shaped expansion legs by means of springs interposed between the cam and the sliding portions to energize the sliding portions in their sliding direction. The expansion legs are respectively provided between a seat support frame for carrying the seat thereon and a mounting frame to be fixed directly or indirectly to a floor of the vehicle. With this improved vertical adjustment device, the cam can be rotated to adjust the elastic forces of the springs.

Abstract: The specification discloses a chair control in which the pretension on the bias means can be adjusted by means of a bolt having a hollow shank with a retractable lever normally stored therein. There is a slot extending from the opening of the hollow shank down one side which can be engaged by said lever when the lever is retracted from the hollow shank and pivoted to one side. There is a retainer cap on the end of the hollow shank which includes an inwardly projecting annular lip which engages an annular rib on the lever to normally hold the lever in its stored position within the hollow shank of the bolt, even though the bolt is oriented upside down when the chair control is mounted on a chair. The lip is yieldable so that one can grasp the lever and pull it out past the lip when one wants to pivot it to one side and into the slot and thereafter rotate the bolt by applying a force to the lever.

Abstract: This invention provides for a loading arm for use with material handling systems and includes a support structure and an arm pivotally attached to the support structure for swivel movement in both the horizontal and vertical plane relative to the support structure.

Abstract: A driver's seat for tractors or the like has a system such as crossing levers or a parallelogram for keeping it horizontal on changes in level, which take place when a spring under the seat is compressed. For making possible adjustment to different weights of drivers without changing the natural frequency of the springing motion upwards and downwards of the seat, the spring has two runners acting on cams on the levers of the system so that, when the spring is moved in relation to the cams, the leverage of the spring by way of the levers on the top part of the seat is changed. Such horizontal motion of the spring is produced by a carriage pushed backwards and forwards by a threaded rod with a handwheel.

Abstract: An air lumbar support is provided for establishing a desired attitude of a driver's seat of a vehicle, and is associated with an attitude control system. A pad of a seat back is supported by a plurality of air bags, each of which is connected with a solenoid valve, which when open, permits the air to be discharged into the atmosphere from the air bag. When a desired attitude is to be established, air under pressure is fed to the air bags. Attitude establishing data is in the form of a number of times the solenoid valves are energized for opening for short intervals, and is stored in a non-volatile semiconductor read-write memory if the attitude is to be registered. In response to a key operation, a microprocessor reads registered data automatically, initially driving an air pump, followed by opening the solenoid valves a number of times indicated by the data, thus establishing a desired air pressure in the air bag.

Abstract: A mirror assembly for a vehicle comprises a housing (12) and a mirror assembly (18, 20) mounted therein. The housing includes attachment means (30, 32, 34, 36) for supporting the mirror (18, 20) in the housing (12). Support means (22) pivotably mounts the mirror assembly (10, 18) to the attachment means (30, 32, 34, 36). The support means (22) includes first and second arm means (40, 42, 44, 46) which mount the support means (22) to the attachment means (30, 32, 34, 36). The first arm means (44, 46) are mounted in tension and the second arm means (40, 42) are mounted in compression. The prestressing of the first and second arm means (40, 42, 44, 46) serves to reduce vibration of the mirror relative to the vehicle and thereby substantially reduce blurring of images on the mirror.

Abstract: Installation and maintenance equipment to tension a fabric sleeve filter supported from a bag support frame in a baghouse by a retainer rod and a tensioning spring. A pneumatic tool is configured to be removably coupled to the retainer rod while compressing the tensioning spring to pull taut the fabric sleeve. A flow control valve regulates the speed at which the spring is compressed and a pressure regulator determines the force applied to the spring.

Abstract: A chair provided with a seat carrier and an associated backrest carrier includes a pneumatic spring connected between the seat carrier and backrest carrier, and a mechanical draw spring one end of which is connected directly to the backrest carrier and the other end of which is connected to an adjustable lever pivotally mounted on the seat carrier. The pneumatic spring and mechanical spring are disposed in side-by-side parallel relation to one another between a pair of generally vertical spaced bars forming a portion of the backrest carrier. The force exerted by the mechanical spring is in opposition to the restoring force exerted by the backrest carrier so that movement of the lever to increase the force exerted by the mechanical spring reduces the total restoring force exerted on the backrest carrier.

Abstract: The device comprises a stationary bottom frame, a vertically movable top frame urged upwards by a compression spring, and scissors-type guiding levers between the top and bottom frames. One end of the spring is applied against the guiding levers and the other end is applied against a screw-and-nut system for adjusting flexibility of the suspension according to the weight of the user. A screw or a toothed rack are provided for adjusting the useful vertical range of travel of the suspension according to the height of the user.

Abstract: A resilient mounting for a reclining seat, the mounting including a first member to be secured to a supporting base for the seat, a second member to be secured to the seat and which is pivotally connected to the first member, and a torsion bar which forms the pivot for the two members and which provides a return bias when one of the members is tilted relative to the other.

Abstract: An adjustable resilient mount for use with a cab secured to a tractor by vibration isolating mounts. The mount is adjustable to selectively increase or decrease the spring rate of the vibration isolating mounts and change the resonant frequency of the cab on its mounts. The device is particularly useful for tuning out annoying low frequency cab vibrations induced by tire lugs contacting the ground.

Abstract: The specification discloses a chair control employing an open top, generally rectangular drawn cup for housing an energy storage package. An axle secured to and extending between stretchers which are secured to a tilting chair or member thereof, is journaled in the drawn cup and carries the energy storage package. Means for adjusting the preload of the energy package and reducing the likelihood of an energy package failure are provided. First and second interlocking spindle support members are provided which form a cup reinforcing and stress distributing structure roughly box-shaped in cross section. The four outside corners of the cup are strengthened by indented sidewall portions. A strengthening flange is disposed about the periphery of the cup and the axle journaled in the cup, has a relatively large diameter for distributing stress.

Abstract: A seat suspension system includes a rigid support plate angled downwardly and pivoted to a supporting vehicle at the plate's forward end. A bucket seat is connected to the plate by hand screws that extend through slots in the plate to provide leg room adjustment. One end of the coil spring is adjustably attached to the seat support plate by a connector extending through a slot in the plate to provide forward and rearward adjustment, independent of the seat adjustment, thereby comfortably supporting operators of different heights and weights between about 100 and 400 pounds. A safety interlock switch prevents operation of the tractor unless an operator is in the seat, and a latch is provided to latch the seat in an inclined position when the tractor is not in use.