US3747976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seats
Assignee: Bostrom Seating Inc
•
Filing: 1971-01-25
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Granted: 1973-07-24
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Expires: 1991-01-25
Abstract
Abstract A seat back adjustment means utilizing a pivoted arm between the seat part and the back part and a rack and pinion arrangement at one end of the arm connects to one of the parts to provide an effective change of length of the arm so as to thereby adjust the angle of the seat back. Preferably the rack is formed in a rear portion of an arcuate slot such that weight against the seat back tends to hold the teeth of a pinion member in the rack portion.
Inventors
- 👤 R Lacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:40
CPC Classifications
B; B60; B60N; B60N2/00; B60N2/24; B60N2/30; B60N2/3088; B60N2/309; A; A47; A47C; A47C1/00; A47C1/02; A47C1/022; A47C1/024; A47C1/025; A47C1/026; B60N2/02; B60N2/22; B60N2/235; B60N2/2356
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
A seat with back adjustment means, comprising in combination, a seat part pivotally connected at its rear end to the lower end of a back part, a back part support arm pivotally connected at one end to one of said parts and displaceably connected at its other end to the other of said parts by a rack and pinion arrangement, the pinion member of the rack and pinion arragement being mounted on said other of said parts for rotation about an axis thereon and movable along a rack on said back part support arm into a plurality of discrete positions so as to vary the inclination of the back part, and the rack being so inclined to the length of the back part support arm that the pinion member is forced into locking engagement with the rack in any selected one of said discrete positions by the load applied to the back part when the seat is occupied.
Claim 2
Dependent Claim
158 words
A seat with back adjustment means, comprising in combination, a seat part pivotally connected at its rear end to the lower end of a back part, a back part support arm pivotally connected at one end to one of said parts and displaceably connected at its other end to the other of said parts by a rack and pinion arrangement, the pinion member of the rack and pinion arragement being mounted on said other of said parts for rotation about an axis thereon and movable along a rack on said back part support arm into a plurality of discrete positions so as to vary the inclination of the back part, and the rack being so inclined to the length of the back part support arm that the pinion member is forced into locking engagement with the rack in any selected one of said discrete positions by the load applied to the back part when the seat is occupied.
Claim 3
Dependent Claim
13 words
The seat of claim 1 further characterized in that the rack is arcuate.
Claim 4
Dependent Claim
56 words
The seat according to claim 1 wherein the pinion member has at least two teeth for simultaneous engagement with respective teeth on the rack and abutment means engageable with the arm to substantially take up slack between the pinion member and rack when said two teeth are in simultaneous engagement with respective teeth on the rack.
Claim 5
Dependent Claim
72 words
The seat according to claim 3 still further characterized in that the rack is formed along one side of a parallel-sided slot in the arm, and the pinion member has three teeth, one of the teeth on the pinion member being in abutting engagement with the other side of the parallel-sided slot when the other of the teeth on the pinion member are in simultaneous engagement with respective teeth on the rack.
Claim 6
Dependent Claim
60 words
The seat according to claim 1 wherein the rack is formed on the arm and the pinion member has two teeth, each in the form of a pin, for simultaneous engagement with the rack, the pins extending parallel to one another and to the axis of the pinion member and being diametrically opposed about the axis of the pinion member.
Claim 7
Dependent Claim
68 words
The seat according to claim 5 comprising a substantially elliptical cam rigid with the pinion, the minor axis of the cam intersecting the axis of each pin and of the pinion member, the cam, when the pins are in simultaneous engagement with the rack, being arranged to bear against an abutment surface on the arm whereby to substantially take up slack between the pinion member and the arm.
Claim 8
Dependent Claim
140 words
A seat with back adjustment means, comprising in combination, a back part pivotally connected at its lower end to the rear end of a seat part a back part support arm pivotally connected at its forward end to said seat part and carrying at its rearward end a rack engaged with a pinion member mounted on the seat part for rotation only, the rack being positioned with its teeth facing in the general direction of the forward pivot connection of the arm but at varying distances therefrom so that rotation of the pinion member is operable to vary the effective length of said arm and thereby pivot said back part relative to said seat part and so that the load on the back part when the seat is occupied acts to lock the pinion member in engagement with said rack.
Claim 9
Dependent Claim
140 words
A seat with back adjustment means, comprising in combination, a back part pivotally connected at its lower end to the rear end of a seat part a back part support arm pivotally connected at its forward end to said seat part and carrying at its rearward end a rack engaged with a pinion member mounted on the seat part for rotation only, the rack being positioned with its teeth facing in the general direction of the forward pivot connection of the arm but at varying distances therefrom so that rotation of the pinion member is operable to vary the effective length of said arm and thereby pivot said back part relative to said seat part and so that the load on the back part when the seat is occupied acts to lock the pinion member in engagement with said rack.
Claim 10
Dependent Claim
45 words
The seat according to claim 7 wherein a respective said arm is mounted adjacent each side of the seat, and a respective pinion member, one associated with each said arm, is mounted at each end of a shaft journalled on the other of said parts.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |