Work surface support
DCFirst Claim
1. A support means for supporting a support platform from a fixed base whereby the support platform is movable between a first position at least partially below the fixed base and a second position in front of the fixed base, said support means comprising a first element adapted to be mounted to the support platform, a second element adapted to be affixed to said fixed base, a pair of linkage elements each pivotally fixed at one end to said first element at spaced intervals on said first element and each pivotally mounted at the other end to said second element at spaced locations spaced on said second element for movement of the support platform between the first and second positions and throughout such movement the attitude of said support platform remains substantially constant, said support means further comprising a locking means for locking said support platform in a range of positions including said second position, said locking means comprising a first locking member supported on one of said elements and having a first engagement face engagable with a second engagement face provided on a second locking member provided on another of said elements, said locking members being moveable relative to each other upon the exertion of a force to one of these two elements for moving said locking members to a released position at which the engagable faces are disengaged for subsequent movement of said support platform relative to said base to any of a plurality of desired positions, release of the force being effective to cause said engagement faces to re-engage to retain said second element relative to said first element in the desired positions.
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Abstract
A number of embodiments of supports for supporting a support platform for movement relative to a base in a generally parallel orientation through a plurality of positions. The support includes a pair of parallel lengths pivotally connected at their ends to the support platform and the base. A locking mechanism is provided for locking the support platform in any of a plurality of positions and this locking mechanism includes serration formed on one of the support lengths and a cooperating locking member carried by one of the other elements.
92 Citations
52 Claims
- 1. A support means for supporting a support platform from a fixed base whereby the support platform is movable between a first position at least partially below the fixed base and a second position in front of the fixed base, said support means comprising a first element adapted to be mounted to the support platform, a second element adapted to be affixed to said fixed base, a pair of linkage elements each pivotally fixed at one end to said first element at spaced intervals on said first element and each pivotally mounted at the other end to said second element at spaced locations spaced on said second element for movement of the support platform between the first and second positions and throughout such movement the attitude of said support platform remains substantially constant, said support means further comprising a locking means for locking said support platform in a range of positions including said second position, said locking means comprising a first locking member supported on one of said elements and having a first engagement face engagable with a second engagement face provided on a second locking member provided on another of said elements, said locking members being moveable relative to each other upon the exertion of a force to one of these two elements for moving said locking members to a released position at which the engagable faces are disengaged for subsequent movement of said support platform relative to said base to any of a plurality of desired positions, release of the force being effective to cause said engagement faces to re-engage to retain said second element relative to said first element in the desired positions.
- 46. A support means for supporting a support platform from a fixed base whereby the support platform is movable between a first position at least partially below the fixed base and a second position in front of the fixed base, said support means comprising a first element adapted to be mounted to the support platform, a second element adapted to be affixed to said fixed base, a pair of linkage elements each pivotally fixed at one end to said first element at spaced intervals on said first element and each pivotally mounted at the other end to said second element at spaced locations spaced on said second element to enable movement of the support platform between the first and second positions whereby throughout such movement the attitude of said support platform remains substantially constant, said support means further comprising a locking means for locking said support platform in a range of positions including said second position, said locking means comprising a first locking member supported on one of said linkage elements and having a first engagement face engagable with a second engagement face provided on a second locking member provided on another of said elements said locking members being relatively moveable between a released position at which the engagable faces are disengaged to allow movement of said support platform relative to said base and gravitationally biased into a plurality of locking positions at which the engagement faces are engaged to retain said second element relative to said first element in one of said range of positions, at least one of said locking members being serrated.
Specification