Adjustable seat or table
First Claim
1. A seat or table or a pair of parallel moving surfaces connected by three or more pantograph or “
- lazy tongs”
arrangements, whereby the separation between the two surfaces may be adjusted;
where said adjustable separation is achieved by means of pairs of “
travelers”
threadably connected to “
driving rods”
by means of differentially “
handed”
threads;
said driving rods all mounted to a substantially flat first surface, with one pair of said travelers driving the proximal end of each pantograph, and where all said driving rods are connected by gearing end-to-end in a ring-type configuration, so disposed as to allow all the driving rods to rotate in concert; and
where the distal end of each pantograph is hingeably connected to a second substantially flat mounting surface, so that when the said driving rods are rotated the separation between the two said surfaces is altered by means of the expansion or contraction of the driven “
lazy tongs”
pantographs.
0 Assignments
0 Petitions
Accused Products
Abstract
A pair of parallel moving surfaces, such as may be used for construction of an adjustable height table or seat are connected by a plurality of pantographs or “lazy tongs” mechanisms, each driven from a differentially threaded control rod.
By suitable gearing connections among them, the pantographs are caused to operate in concert, and thus to keep the surfaces parallel as the distance between them is continuously varied.
By appropriate mounting of the pantograph ends, the mechanisms are allowed to fold closer together at the minimum separation distance, thereby further minimizing this separation. The use of a set of springs assists in expansion from this minimized separation situation.
The overall result is a simply operated mechanism for the continuous separation adjustment of a pair of parallel moving surfaces, together with the maximization of the range of separation adjustment between the two surfaces, concomitant with a minimization of the size and weight of the overall apparatus.
16 Citations
13 Claims
-
1. A seat or table or a pair of parallel moving surfaces connected by three or more pantograph or “
- lazy tongs”
arrangements, whereby the separation between the two surfaces may be adjusted;
where said adjustable separation is achieved by means of pairs of “
travelers”
threadably connected to “
driving rods”
by means of differentially “
handed”
threads;
said driving rods all mounted to a substantially flat first surface, with one pair of said travelers driving the proximal end of each pantograph, and where all said driving rods are connected by gearing end-to-end in a ring-type configuration, so disposed as to allow all the driving rods to rotate in concert; and
where the distal end of each pantograph is hingeably connected to a second substantially flat mounting surface, so that when the said driving rods are rotated the separation between the two said surfaces is altered by means of the expansion or contraction of the driven “
lazy tongs”
pantographs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- lazy tongs”
Specification