Seats
First Claim
1. A seat includinga seat or back rest support,a seat or back rest part,a bottom frame connected to said part, anda device for adjusting the position of said part relative to said support in a stepwise manner, said device includinga rotary knob,a disc carrying a plurality of transversely extending pins and coupled to said knob for rotation therewith about an axis,a gear wheel having teeth defined by flanks, which teeth are co-operable with said pins and are defined within an outer peripheral envelope, said flanks of the teeth which adjoin said outer envelope being constructed such that reaction forces due to contact between said flanks and said pins are directed so as to pass through said disc axis,a pinion connected to said gear wheel,a toothed segment in engagement with said pinion,a rear transverse shaft rotatably mounted in said bottom frame and connected to said toothed segment,an angled two-arm lever,a longitudinal rod having two ends, one end of which is articulated on said toothed segment while the other end is articulated on one arm of said angled lever,a front transverse shaft rotatably mounted in said suport and connected to the other arm of said angled lever, andrespective link connected to said rear transverse shaft, each of which is articulated on said support.
1 Assignment
0 Petitions
Accused Products
Abstract
A seat includes a device for adjusting the position of a seat part relativeo its support. The device is operated by a rotary knob which rotates a pinned disc of a lantern wheel gearing arrangement. The pins of the disc cooperate with teeth of a gear wheel which is connected to a pinion that rolls on a toothed segment articulated to the seat support. The teeth of the gear wheel are constructed so that reaction forces due to contact between the flanks and the pins are directed so as to pass through the rotational axis of the disc. Therefore no torque is applied to the disc and it remains stable.
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Citations
7 Claims
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1. A seat including
a seat or back rest support, a seat or back rest part, a bottom frame connected to said part, and a device for adjusting the position of said part relative to said support in a stepwise manner, said device including a rotary knob, a disc carrying a plurality of transversely extending pins and coupled to said knob for rotation therewith about an axis, a gear wheel having teeth defined by flanks, which teeth are co-operable with said pins and are defined within an outer peripheral envelope, said flanks of the teeth which adjoin said outer envelope being constructed such that reaction forces due to contact between said flanks and said pins are directed so as to pass through said disc axis, a pinion connected to said gear wheel, a toothed segment in engagement with said pinion, a rear transverse shaft rotatably mounted in said bottom frame and connected to said toothed segment, an angled two-arm lever, a longitudinal rod having two ends, one end of which is articulated on said toothed segment while the other end is articulated on one arm of said angled lever, a front transverse shaft rotatably mounted in said suport and connected to the other arm of said angled lever, and respective link connected to said rear transverse shaft, each of which is articulated on said support.
Specification