An extension and retraction mechanism for a three section extensible boom is disclosed utilizing an internally disposed hydraulic cylinder connected between a stationary boom section and an intermediate boom section with a cable connection located entirely interior of the boom having opposite ends anchored to opposite ends of the stationary section with the cable routed around sheaves on the moving end of the hydraulic cylinder and a base end of the intermediate boom section with a cable attachm...

An extensible table has a rectangular frame with pairs of longitudinal beams and cross beams, a leg at each corner, and two draw-out plates which can be selectively stacked, and aligned in co-planar condition. The improvement is that each leg has a top recess in which is engaged a male portion of a shoulder element including an upper L-shaped portion defining a cavity to receive the cross beams. Roller means are on one arm of the L-shaped portion to carry the draw-out plates. Each longitudinal b...

An extensible partition utilizes a hollow rectangular elongated partition for erection in a generally vertical plane having spring loaded devices extending upwardly and downwardly from the uppermost and lowermost marginal edges thereof, a slot, extending vertically along a vertical marginal edge of the apparatus, communicates to the hollowed out cavity portion of the panel, so as to provide access throughout the length of the cavity, extending substantially for the entire length of the panel. A ...

The invention pertains to an extensible table, characterized by the fact that it consists of at least one sliding-out table top and at least one extension, whereby the latter is located, in position of rest, under the slidable table top or tops, and whereby said extension can cooperate, by means of outwardly directed protrusions, with vertical slots in each of the adjacent side members of the table frame, and whereby means are provided within said side members which permit, after sliding out the...

The telescoping elements of an extensible rod may be coupled sequentially to a coaxial, partly threaded spindle by respective internally threaded coupling members, each element being drivingly engaged with the spindle by a previously engaged, abuttingly coupled element. A yieldably resilient mounting for the coupling member or for one of two cooperating abutment members permits smooth engagement of the spindle threads with the coupling members.

An extensible table comprises a foldable board and a pair of basis structures, at least one of which is mounted on wheels, the two basis structures rigidly support respective end portions of the foldable board and are displaceable between a first operative condition in which they are spaced apart from each other, with the foldable board fully extended, and a second operative condition in which they are adjacent to each other, with the foldable board folded.

An extensible watch strap is made up from tubular links which extend transverse to the length of the strap. The links are arranged in two rows with the links in one row offset from the links in the other row. Each link is connected to the two adjacent links in the other row by U-shaped connectors which have limbs projecting into respective links. The limbs are received between pairs of leaf springs which act in the longitudinal direction of the strap and tend to push both of the limbs which are ...

An extensible table (10) has one or more pivotal leaves (11) movable between an upper use position and a lower storage position. Each leaf is pivotally supported by a pair of hinges each of which includes a journal (34) which is connected to the pivotal leaf and is received within a journal block (30) formed in the frame of the table. One hinge of each pair is a positioning hinge and the journal thereof has first and second recesses corresponding to the use position and the storage position, res...

An extensible ladder includes a plurality of sections, each having a pair of tubular uprights connected by a rung, with the uprights of each section being slidably engaged with the corresponding uprights of an adjacent section. The inside surface of the tubular uprights are provided with longitudinally extending grooves, which reduce the area of sliding contact between adjacent uprights, thereby making the ladder easier to extend or collapse.

The present invention relates to a horizontally extensible construction comprising a series of rigid prefabricated elements capable of being moved close together to render the construction more compact, for example for transport, or moved apart into the position for use to create space units between them suitable for use as dwelling units or the like, the said elements having connecting members connected to the elements by hinges which enable the construction to be placed into the position for u...