Abstract: A telescopically extensible lifting column, particularly for the height adjustment of a camera, consists of an external column member resting on a base plate, a middle column member which is telescopically extensible from the external column member, and a central column which is extensible from the middle column member and on which the camera can be mounted. By means of a piston/cylinder type drive device, the middle column member can be pressurized pneumatically in relation to the stationary external column member. The drive device also has a traction cable which is wound or a deflection member mounted rotatably on the middle column member. The cable is connected by means of its inner end portion to the central column member and by means of its outer end portion to the external column member.

Abstract: A bedside table has a base with a vertical tube thereon, a tabletop with a vertical member slidably disposed in the tube, and a locking mechanism which can releasably lock the tube and vertical member against relative movement.

Abstract: A stand assembly is provided for rotationally holding a door, window frame, or the like, for painting purposes. Pivot points are provided on the base and an extension contact with respective ends of the object to be held in the assembly. All surfaces of the object are exposed for painting when held and the object may be pivotally rotated during the painting. The assembly may be provided in a collapsible format.

Abstract: A steerable electrically powered three-wheeled vehicle has an upstanding seat post mounting a seat thereon. The seat post is telescopically and revolvably received in a seat post support fixed to the frame of the vehicle. A seat motor is provided on the vehicle which has a drive connection to the seat post assembly for raising and lowering it and there is a control on the vehicle for selectively operating the seat motor forwardly or reversely to raise or lower the seat post and seat. A pair of master lock parts are provided, one on the seat post support and the other on the seat post, and parts on the respective lock parts are automatically engaged when the seat post and seat are lowered to lowered position for locking the otherwise relatively revolvable parts against relative rotation. The lock parts automatically prevent operation of the motor driving the vehicle, unless the seat is in the forward facing position.

Abstract: A storage system for holding athletic equipment comprising a body member having a first side, a second side, a back opening, and an inside surface communicating with the back opening. The inside surface has a first and second inside arcuate surface respective in the first and second side of the body member. A pair of rib members is integrally bound to the inside surface of the body member. Each rib member has a rib lip protruding therefrom. The rib lip of each rib member protrudes towards each other such as to define a rib opening there between. A lower and upper height adjustment member is slidably disposed within the body member against the first and second inside arcuate surface. A first external channel member is connected to the first side and has a first channel opening, and a second external channel member is connected to the second side and has a second channel opening.

Abstract: A cylinder of adjustable length comprises a cylinder body, two pistons slidable in the cylinder body, and a rod which is connected to both pistons and projects from one end of the cylinder body. A dividing wall forming part of the cylinder body defines a first chamber which faces one of the pistons and a second chamber which is separate from the first chamber and in which the other piston is slidable. The two chambers are filled with a fluid, preferably grease, and communicate with each other through a duct controlled by a remotely-controllable valve. The rod and the cylinder body can be locked in any relative position by the closure of the valve to prevent the passage of the fluid from one chamber to the other.

Abstract: A seat device for a very small size shovel car which does not extend, when it is not used, rearwardly from a car body of the shovel car to improve the handling facility and the operability of the shovel car. The seat device includes a support element mounted at a rear lower portion of the car body and a support post mounted on the support element for pivotal motion around a horizontal axis or an obliquely rearwardly inclined axis between an operative position in which it is directed upwardly rearwardly and a seat face of a seat mounted at the top end thereof is directed upwardly to allow an operator to be seated thereon and an inoperative position in which the support post extends vertically upwardly along the car body and the seat face of the seat is directed rearwardly. The support post is secured at each of the operative and inoperative positions.

Abstract: A telescopic support 14 of variable length has an outer tube tube 11 and an inner tube 12 which is telescopically displaceable therein. A shallow external thread 16 is provided at one end of the outer tube 11 onto which there is screwed a positioning nut 17 with a lowering sleeve 14 rotatably secured thereto. In the region of the thread 16 there is at least one elongate slot 18 in the outer tube into which a latch bolt 13 engages which is supported axially on the lowering sleeve 15. In accordance with the invention the lowering sleeve 15 can be rotationally locked in both directions in the extended position by a rotary latch 21 which engages in the elongate slot 18.

Abstract: An elevation mechanism of a tripod in which a vertical column having a universal head fixed at its upper end is elevationally journalled within a thrust bearing hole bored within a metal fitting base by means of a lifting mechanism of the rack and pinion type and within which is journalled one end portion of three standard legs of a tipod which are equally disposed about the periphery thereof and which are pivotable with respect thereto the improved elevation mechanism of the tripod in which the vertical column comprises an aluminum tubing, and a rack member molded as a separate member with respect to the column from a suitable synthetic resin and which is formed with a rack gear is integrated within one side of the vertical column along the axial direction thereof, while a pinion gear is rotatably supported within the metal fitting base so as to be meshed with the rack gear.

Abstract: The extensible support pole unit having a simple structure including a plurality of shaped members, e.g., cylindrical bodies, band-like plates having, e.g., an arched cross-sectional shape, a band-like plate feed mechanism, and a driving device. The support pole is extended to stand or retracted by only paying out or winding up the band-like plates. The support pole can therefore be extended to a length freely selected, and it is possible to freely set a large extension ratio by selecting the length of each cylindrical body and the number of cylindrical bodies. The band-like plates have, for example, an arched cross-sectional shape and have properties such as to be strong against the vertical load as compared with flat plates. The band-like plates are retained in the guide slits or guide holes formed in the partition members disposed in the cylindrical bodies to further improving the above properties.

Abstract: A poolside basketball goal for in-ground swimming pools with a backboard and hoop supported by a support having an extended horizontal component. A support is anchored in the ground by an anchor which is located more than 3 feet away from the in-ground pool and the extended horizontal component of the support is greater than 3 feet and is sufficiently long to laterally traverse the sidewalk to suspend the hoop over the pool. The support is moveable with respect to the anchor and may be pivoted away from the swimming pool so that the sidewalk around the swimming pool is free from impedance of pedestrian traffic by the horizontal component of the support. Locking mechanisms, such as set screws, allow for vertical telescopic adjustment as well as for locking the support pool in a selected angular position. The anchor includes radial members to resist rotation of the anchor embedded in concrete.

Abstract: A bedside table has a base with a vertical tube thereon, a tabletop with a vertical member slidably disposed in the tube, and a locking mechanism which can releasably lock the tube and vertical member against relative movement.

Abstract: According to an illustrative example of the invention a gas spring has adjacent one end thereof an axially extending control pin. This control pin is prestressed towards an outer position and can be pushed inwards for opening a valve, which valve is provided in the passage between two working chambers established by a piston, said piston being fixed to a piston rod. When the pin is in its outward position, the gas spring is locked in the respective axial length. When the control pin is moved inwards, the axial length of the gas spring can be varied. The gas spring is intended for combination with a chair or table column. In combining the gas spring with a chair, the upper end of the gas spring cylinder is fixed to the lower side of the seat plate. The lower side of the seat plate is provided with a manipulating level. The manipulating lever engages the outer end of the control pin through a telescopic arrangement of control members or adapter elements.

Abstract: An adjustable frame includes an outer tubular member and an inner cylindrical member disposed in longitudinally adjustable relation, the inner member being of substantially smaller diameter than the interior surface of the outer member so as to provide an annular space between the two members. Inner and outer adapter rings are disposed about the inner cylindrical member within the annular space. The adapter rings have longitudinally tapered mating surfaces for providing a cam action. A sleeve is threadedly supported from the outer tubular member and engages one of the adapter rings for moving it axially relative to the other ring to thereby create a radial expansion force within the annular space, thus locking the inner cylindrical member in a fixed longitudinal position relative to the outer tubular member.

Abstract: A device for use for mounting a bicycle seat onto the frame of a bicycle is disclosed which uses a variable height mechanism which may be quickly and conveniently adjusted between two heights by moving the seat slightly to the side and then up or down to the selected position. A spring is used to provide both a torsion force retaining the mechanism in its locked position until the seat is to be adjusted, and a compressive force to bias the seat into its higher position. A guide mechanism is used to limit the relative movement between a lower segment and an upper segment to two locking positions at opposite ends of a guided vertical relative movement.

Abstract: A device for adjusting the inclination of the backrest and/or seat of chairs, particularly office chairs, has a gas spring, a head member connectable to the gas spring, an L-shaped lever member pivotally connected to the head member and including a first arm, a second arm, and a rod acting on the first arm so as to cause rotation of the L-shaped member and consequent pushing action of the second arm on the driving shaft of the valve of the gas spring.

Abstract: An adjustable oleopneumatic support, particularly for the height adjustment of the seats of office chairs with central columns, is disclosed. The oleopneumatic element includes a hollow cylindrical body with a packing member realizing an upper and a lower cavity, the respective lower end being rigidly linked to the base of the chair, and a coaxial hollow stem, the head of which is rigidly linked to the seat of the same chair, the hollow coaxial stem being rigidly connected to a piston which defines inside the upper cavity two chambers, an upper and a lower chamber, respectively, both containing fluid; the hollow coaxial stem is provided inside with valvular coaxial actuation means controlling a passage for a hydraulic fluid, the respective outlets being placed above and below the piston, respectively; the lower cavity being able to contain compressed gas.

Abstract: The device has a pedestal (3) that is fastened tightly to base (2). The pedestal has two receiving openings for screws as well as an arc-shaped slot (6) in a plate (4). An adjustable element (7) can be fastened to pedestal (3). This adjustable element (7) has two parallel slots (9,9') as well as a receiving opening for a screw. Depending on the placement of screws (11,11'), adjustable element (7) can be moved plane parallel to base (2) in slots (9,9') or swiveled within arc-shaped slot (6) at an angle to base (2).

Abstract: A housing (50, 52) defines a slide chamber (54) in which a slide member (34) reciprocates between three positions. A coil spring (86) holds the slide member (34) into a center position. In this position, slide member (34) blocks fluid flow through a port (28) and positions an electrical conductor (96) away from electrical contacts (110, 112). A push on the slide member (34) moves the electrical conductor (38) into circuit making contact with the contacts (110, 112). A pull on slide member (34) moves an exhaust passageway (36) in the slide member (34) into communication with the fluid port (28). The switch function activates a compressor which pumps air into an inflatable seat actuator. The valve function exhausts air from the inflatable seat actuator.

Abstract: An adjustable-length column for chairs, tables or the like has an upright tube and a gas spring disposed in it. The piston rod of the gas spring is supported against a bottom plate of the upright tube. To assure support of the bottom plate in the face of extremely strong forces in the axial direction of the column at little manufacturing expense, the rim of the upright tube is bent inward approximately semicircularly in cross section. The bottom plate is supported on the end face of this rim.

Abstract: A speaker support for elevating and supporting a speaker comprising a base, at least three support dowels attached to the base and extending upwardly from the base. The dowels include a first support dowel located laterally between second and third supports dowel that are both spaced forward of the first support dowel. A support shelf extending forwardly from the support dowels and having openings corresponding to the support shelf to be vertically adjustable along the support dowels. The support shelf tends to pivot about the support dowels when a speaker is placed on the support shelf, causing a locking action at the support shelf openings and the dowel supports which prevents the support shelf from moving downward on the dowel supports.

Abstract: An air-sprung vehicle seat includes an air spring and a scissors linkage which are operative for adjusting the vertical height of the seat. The vehicle seat also includes a locking device for adjustably fixing the vertical height of the seat, the locking device including a fixing element which is articulated to the scissors linkage and a fixing device which is engageable with the fixing element for fixing the relative position thereof in the seat. The seat also includes a non-return valve which is responsive to actuation of the fixing device for controlling the admission of compressed air into and the escape of compressed air from the air spring.

Abstract: A lockable elevating mechanism for the continuous adjustment of chair seats or the like comprises a guide tube, in which a length-adjustable, lockable gas spring is slidably guided. The piston rod of the gas spring is connected to the bottom plate of the guide tube. The housing of the gas spring is guided by means of a guide sleeve in the guide tube, the guide sleeve having a central carrying tube, in which slide sleeves are arranged with space. The carrying tube is surrounded by a carrying sleeve held in the guide tube. Thus a gas spring is obtained, on the one hand, which is free of bracing, resistant to wear and with good sliding qualities, and, on the other hand, the manufacturing of the guide sleeve is favorable in terms of material expenditure.

Abstract: A movable basketball goal has a base and first and second support members extending up from the base. Each of the first and second support members comprises two separate elements, one of which is pivotally attached to the base. The other elements are pivotally attached together at their upper ends. A backboard support member extends from the upper ends of the support members, and a backboard and a goal basket are mounted on it. The two elements of each support member are movable relative to one another, to enable the goal to be collapsed to a compact configuration. Further, the goal basket can be movable relative to the backboard. The two elements of the first, forward support member can be separable from one another, while the two elements of the second, rear support member can be pivotally connected to one another.

Abstract: A speciality convenience device comprising a U-shaped framework of rigid-tubing, serving to both house and support an extensible flexible-gooseneck member capable of being manually omni-adjusted into any desired positional attitude; the device being substantially flat between legs of said U-frame so as to be easily installed upon an existing automobile's or spectator-bench's seat back, while thus held captive thereto by presence of the user's own back resting thereupon; the user being either an adult or juvenile by virtue of a special U-frame width-adjustment provision which includes a co-operative sizing-adjustment of the back-spanning fabric covering; the covering including a pocket-like formation thereto also facilitating a convenient stowing place for the gooseneck's detachable sunshield member, including provision of a sunshield folding capacity, as well as an optional attachable child's activity-center thereto.

Abstract: An interior clamping device for tubular poles which includes a driver disposed in one tubular member with a tapered end portion projecting outwardly from the tubular member. An expandable sleeve is disposed in a second tubular member. Locking means removably secure the driver to the sleeve by a fastener so that when the driver is rotated in one direction the expandable sleeve is moved radially outwardly against the inner surface of the tube to lock the tubes together.

Abstract: A multi-purpose stand having a rack, a plurality of plates and a base. The rack has a plurality of tubular elements of different dimensions, each of which is attached to each other by pins penetrating holes provided on the corresponding tubular elements. A bottom frame is mounted on the lower one of the tubular elements for vertically maintaining the rack. Two plates have a pair of hinging hooks on an exterior side. A retaining member is secured on one of the tubular elements and has a pair of hinging holes provided on the retaining member for engaging with the hinging hooks. A pair of securing means are mounted on a rod which is mounted on the retaining member and cover the hinging hooks so as to prevent the hinging hooks from disengaging. A pair of supporting elements are received by a pair of slots formed on the lateral side of the retaining member to support the plate mounted on the retaining member. The base has a plurality of door-like members under each of which a case is installed by fixing means.

Abstract: A damper assembly, for supporting a seat of a vehicle such as a small-sized motor boat, comprises a lower bracket adapted to be attached to a floor of the vehicle, an upper bracket adapted to be attached to the seat, and a damper mounted between the upper and lower brackets. The damper includes an outer tube extending upwardly from the lower bracket, an inner tube extending downwardly from the upper bracket and telescopically inserted in the outer tube, and a guide tube secured to the lower bracket and telescopically inserted in the inner tube. The inner and guide tubes are connected together so as to allow the inner tube to slide longitudinally on the guide tube but so as to prevent the inner tube from rotation or turning about the guide tube.

Abstract: A multi-purpose support frame for supporting a cooking grill in an elevated position. The support frame comprises a support base with a support rod secured to the base and extending vertically above an end of the base. A support arm is secured to the rod and extends above and over the support base. The support arm has spaced-apart attachment elements for engaging cooperating parts of the grill for retaining the grill substantially horizontally above the support base. The grill is adjustably position in height above the support base by an adjustment member secured to the support rod. A handle is associated with the grill.

Abstract: The adjusting mechanism is used for exerting a force on two components moveable relative to one another and comprises a cylinder, a piston and a piston rod. A guide rod is also provided on the piston and is guided in a guide connection of a bottom cylinder casting. A control piston is displaceably guided in a longitudinal bore of the piston and in a further longitudinal bore of the guide rod. The piston contains transfer ducts, which are either obturated by the control piston or are freed or exposed by a smaller diameter portion of the control piston. An inner cylinder chamber is completely filled with a flowable or fluid grease. As a result, the piston rod can be locked in position by the control piston closing the transfer ducts and, on releasing or opening the latter, the piston rod can be moved. The locking of the adjusting mechanism in a specific position, as is particularly required in the case of tiltable chairs, is consequently facilitated in comparison to known adjusting mechanisms.

Abstract: A saddle pillar member for cycles, comprising a cylindrical portion intended to be slidably inserted into a tube of the cycle frame and able to be locked in a selectively determined position within this tube by a clamping action exerted on the external surface of the cylindrical portion, and consisting of a metal core having peripheral parts which appear the external surface of the cylindrical portion, and a mass of plastics material applied to this core to complete the cylindrical portion.

Abstract: The adjusting device possesses a hydraulic cylinder in whose cylinder tube there are housed a main piston equipped with a piston rod, an auxiliary piston and a force-exerting spring. The cylinder tube is closed off at both of its ends by an associated end flange. The outer surface of the cylinder tube simultaneously constitutes the guide surface of a guide tube which is fixedly connected by means of a connecting flange with the piston rod. Since the cylinder tube possesses an essentially constant or uniform inner diameter and outer diameter, the guide tube can be constructed to be so long that the adjusting device is stable enough to serve as a supporting column or pillar, e.g. for a chair or other seat structure.

Abstract: The subject invention is directed toward a novel bracket for releasably supporting medical testing and monitoring equipment. The bracket includes a support member for supporting the medical equipment, gripping means for gripping the medical equipment and a vertical member for joining the gripping and supporting means. The gripping means are constructed so as to allow the medical equipment to be quickly removed and conversely to be quickly mounted to the bracket. Coupling means are provided for mounting the bracket to support members. The coupling means are adapted to allow the bracket to mount to support members which are vertically, horizontally or otherwise oriented.

Abstract: The vertically adjustable swivel-chair supporting column with an upright tube (1) located on the foot and with a support tube (2) telescopically movable in the latter and intended for receiving the chair seat part is provided with a lockable length-adjusting element (21) which is installed between the two tubes (1, 2) and the pull-out length of which can be adjusted in steps. The length-adjusting element (21) connected to a tube (1, 2) fixed on the same side as the foot and extendable on the same side as the seat carries, at the distal end (2.1) of the support tube (2), a guide member (22), in which is retained a linkage member (41, 42) intended for controlling the pull-out length of the supporting column. The length-adjusting element (21) is centered and supported by means of a spring intermediate piece (23) on the fixed end (1.1) of the upright tube (1).

Abstract: A medical examining lamp includes a first tubular standard mounted on a base and extending upwardly therefrom and a second tubular standard telescopingly received within the first standard and having a lamp socket mounted at its upper end. A spring assembly is mounted on the lower end of the second standard and includes first and second leaf springs mounted in and diverging outwardly from one end of the second standard. The leaf springs are retained in position by deforming the end of the second standard inwardly into engagement therewith. An arcuate tip is formed on the outer end of each leaf spring for resilienly engaging the inner surface of the first standard.

Abstract: In a telescopic arrangement wherein a plurality of telescoped tubes are provided for retraction and protraction; the tubes each include a nut element, said nut element being axially aligned, and means for causing one tube to engage respective outer one, the combination of a first main drive and working spindle onto which the nut elements are threaded to cause protraction and retraction of the respective tube, the nut elements disengaging one by one from the thread of the spindle as the respective next tube is caused to protract and its nut travels on the first spindle; a second nut retention spindle onto which the nuts of those tubes are threaded which are not yet to be extended or which have been retracted; there is a threadfree space between the two spindles to be traversed by that one of the nuts next to be threaded onto the first spindle and prior to that one of the nuts that travels on the first spindle leaving that first spindle; the two spindles are driven in unison but at a particular ratio so that a

Abstract: A fisherman's boat chair is provided with a tubular support for retaining an umbrella positionable over the chair. The height of the umbrella is adjustable by the selective positioning of a pin through one of a plurality of available through-extending apertures in the support, and the shank of the umbrella is supported by the pin. Velcro strips are used to prevent umbrella rotation and withdrawal from the support after it has been placed in position. The modified chair may also include a quickly removable and attachable beverage holder.

Abstract: An adjustable cycle-type seat post assembly comprises a tubular seat post which fits slidably within an upstanding tubular seat mast. The seat post has a cylindrical bore with a closed upper end and an open lower end. A mounting shaft has an elongated body comprising upper and lower head portions with an intermediate portion between them. The upper head portion has a piston with O-ring seals engaging the cylindrical bore and defining with the closed upper end a variable volume air chamber. The intermediate portion has an axially extending slot engaging a pin secured to the seat post to limit relative axial movement and prevent relative torsional movement. The mounting shaft is secured in the seat mast by axially spaced openings in the lower head, one of which is engaged with a water bottle connecting stud extending through the seat mast wall. Ribs flanking the openings align them with the water bottle stud to facilitate assembly.

Abstract: A lift base for raising and lowering objects such as an ophthalmological chair comprises a piston rotatably and axially movable within a cylinder and connected to a base support which mounts the chair or other object. A sleeve keyed to the cylinder is movable axially relative thereto but locked against rotation. A locking assembly carried by the support is effective to move the sleeve between an unlocked position out of contact with the sleeve wherein both axial and rotational movement of the base support and piston is permitted, and a locked position into contact with the sleeve wherein rotational movement of the piston and base support is prevented but axial movement thereof is permitted.

Abstract: A continuously adjustable levelling column for chairs comprises a guide tube having a lower end and an upper end. A telescopic tube is guided within the guide tube and has a tapered upper end portion extending beyond the upper end of the guide tube. A gas spring is accommodated within the telescopic tube. This gas spring is axially fixed within the telescopic tube. The upper end of a container of the gas spring abuts through a distance piece a support face at the upper end of the tapered portion of the telescopic tube. A piston rod passing through the lower end of the gas spring is axially fixed with respect to the lower end of the guide tube. A locking control pin extends through the upper end of the gas spring and is engageable through a transmission pin by a control handle.

Abstract: An adjustable attitude speaker stand including a base in the form of a pair of laterally spaced apart elongated rails having longitudinal slots formed therein. A pair of posts rise upwardly from the slots and are coupled thereto by followers for forward and rearward movement relative thereto. The upper extremities of the post are also formed with generally vertically extending slots and braces are pivotally connected to the rear extremities of the rails and include followers coupled with such post slots such that the posts may be adjusted forwardly and rearwardly at both their top and bottom ends. A pair of support arms project cantileverly forwardly from the lower portion of the post for receiving and cradling a load speaker such that adjustment of the posts will vary the attitude of such arms to direct sound from the speaker at selected angles from a range projecting generally horizontally across the room to a upward angle of about 45.degree..

Abstract: An adjustable collision avoidance signal for automobiles comprising a brake indicator signal, a mounting bracket, and a pedestal. Horizontal detents in the mounting bracket and complemental notches in the pedestal allow the mounting bracket to adjust vertically. The brake indicator signal is horizontally movable and pivotable with respect to the mounting bracket to which it is fixed. A light shade prevents stray reflections. The internal light source is located at the focal point of a parabolic reflector.

Abstract: A seat is provided with a downwardly depending tubular casing having a generally open bottom except for a retainer therein. The base includes an open top support cylinder which receives the tubular casing therein. The piston of a gas or hydrapneumatic spring cartridge is mounted at the lower end of the support cylinder in axially and radially fixed relation thereto. Even though the gas spring (cartridge and piston) is capable of swiveling about its longitudinal axis relative to the support cylinder, the longitudinal axis of the gas spring (cartridge and piston) remains substantially vertical at all times. The casing is loosely received or floats within the support cylinder and loosely surrounds the cartridge. Near the upper end of the casing an internal wall operatively engages the upper end of the cartridge in such manner that movement of the cartridge along the piston rod causes a corresponding movement of the casing.

Abstract: An adjustable switchboard desk has a top which can be raised and lowered by at least two telescopic legs. In each telescopic leg a hydraulic cylinder and its associated piston are arranged. The cylinder is fixed to the desk-top and the piston is fixed to an outer part of the telescopic leg, or vice versa. The inner and outer parts of the respective telescopic legs are made of closed profile with longitudinally extending, mutually co-acting guide surfaces.

Abstract: A display stand for supporting either a rigid or non-rigid doll or other inanimate human-shaped figure. A flat base and vertical post balance the figure in an upright position. The vertical post telescopes to adjust for the height of the figure. A bracket and a belt extend from the post and provide further support for the figure. The bracket fits under and against the figure's pelvis, providing upward support, and may be moved along the vertical post to adjust for the length of the figure's legs. The belt fits around the figure's torso. Both the bracket and the belt are sufficiently flexible so as to adjust for the figure's circumference and to not mar its surface or weaken its structure. A variation of the display stand permits the figure to be held in a range of positions varying from vertical to horizontal.

Abstract: A taper connection between a chair column and a seat plate is proposed. The external taper of the chair column adjoins a cylindrical section of the chair column. The internal taper of the seat plate, fitted together with the external taper of the chair column, protrudes beyond the transition between cylindrical section and external taper.

Abstract: Twin linkage assemblies shift a support platform between a low profile, fully collapsed position and a fully extended position of a height suitable for supporting a workman underneath an aircraft or for supporting, for instance, an engine at a comfortable working position. A hydraulic cylinder and piston assembly is connected at opposite ends to swivel members and torque arms, the latter of which are connected to short links which in turn are coupled to linkages interconnecting a base and the work supporting platform. The torque arms, in cooperation with the swivel members, facilitate swinging of the links and linkages to reduce the force necessary to separate the platform and base to a value smaller than would otherwise be required.

Abstract: An infant care center that includes a standing, vertical frame and has an infant bed that is suspended outwardly from the vertical frame. The infant bed is adapted to retain the infant and is readily adjustable to a plurality of positions devised for the infant. The bed itself is tiltable about an axis to the various positions and a unique tilt mechanism allows the degree of tilt to be easily selected and then locked into position by attending personnel. The tilt mechanism includes a double acting piston assembly that secures the frame to a point on the infant bed remote from the axis about which the bed is tiltable. The double acting piston assembly includes a piston operable within a cylinder and which divides the cylinder into two variable chambers. Each chamber has a part to introduce and remove hydraulic fluid therefrom and a closed circuit joins the parts so that fluid normally can move from one chamber to the other or the piston travels within the cylinder to move the tilt position of the infant bed.

Abstract: A mechanical lifting device, preferably for a chair seat, comprising two reciprocally telescoping parts, one of which is attached to a chair support, whereas the other part is attached to the chair seat, both parts being mutually spring loaded, a locking screw being pivoted to the first part inside one of its ends and revolving about the longitudinal axis of the part, that the second part comprises an outer locking tube coaxially surrounding a hollow pressure rod and a number of locking nuts, e.g. three, intended for engagement with the locking screw and provided inside the locking tube, the locking nuts being mutually spring loaded and when the pressure rod is actuated enabling the locking screw to turn relative to the locking nuts when they move in the longitudinal direction of the lifting device, thereby the mutual position of the two parts is also changed. When actuation of the pressure rod stops a locking engagement is achieved between locking nuts and locking screw by the aid of the mutual spring load.

Abstract: A resilient support column for height-adjustable chairs or the like includes a piston-and-cylinder type pneumatic spring that is installable in and removable from the column by means of a retaining sleeve structure carried by the spring. The retaining sleeve is connected to the column through a threaded connection that permits quick one-step insertion of the combined sleeve-spring unit into the column, while thereafter affording the advantage of threaded adjustment within the column or threaded removal therefrom. A simple mechanical fastener holds the retaining sleeve in place on the pneumatic spring during shipment and/or assembly.