US3603641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Office-type chair
Assignee: La Z Boy Inc
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Filing: 1969-09-12
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Granted: 1971-09-07
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Expires: 1989-09-12
Abstract
Abstract The base frame of the chair is pivoted to arms on a crossmember having a central downwardly extending stud with a nut thereon. The lower end of the stud has a sleeve of nylon which forms a bearing with a hub of the base which has supporting feet extending therefrom on the ends of which casters are provided. The base frame has a bracket on each side to which the ends of a U-shaped bar is pivotally secured for forward movement when the base frame is tilted with the seat and back frames fixed or movable relative thereto. The central part of the bar is secured in a hook having a hand nut thereon by which tension is provided to the bar to have it preloaded to conform to the weight of the person occupying the chair. Upon the backward tilting of the base frame the bar will bend from the center to thereby resist the tilting movement. A leg rest and mechanism therefor is secured to the fixed or movable seat frame in position to have the leg rest extend forwardly thereof when in use.
Inventors
- 👤 Edward M Knabusch
- 👤 Edwin J Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:16
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/034; A47C1/035; A47C1/0355; Y; Y10; Y10S; Y10S297/00; Y10S297/07
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
In a chair, a unit embodying a back frame, a seat frame and a base frame, a supporting base having a central hub for receiving a threaded stud, a crossmember supported by said stud having arms at the ends extending forwardly thereof adjacent to the sides of the base frame, brackets supported by the sides of the base frame, pivot means connecting the extending ends of the arms and the brackets, and resilient means connected to said brackets and to said crossmember for resisting the rearward tilting movement of the base frame.
Claim 2
Dependent Claim
92 words
In a chair, a unit embodying a back frame, a seat frame and a base frame, a supporting base having a central hub for receiving a threaded stud, a crossmember supported by said stud having arms at the ends extending forwardly thereof adjacent to the sides of the base frame, brackets supported by the sides of the base frame, pivot means connecting the extending ends of the arms and the brackets, and resilient means connected to said brackets and to said crossmember for resisting the rearward tilting movement of the base frame.
Claim 3
Dependent Claim
42 words
In a chair as recited in claim 1, wherein said back frame is pivoted to the base frame and wherein said seat frame is pivoted to said back frame, said frames being movable to a reclining position on said tiltable base frame.
Claim 4
Dependent Claim
49 words
In a chair as recited in claim 1, wherein the resilient means is a U-shape spring element having a transverse portion and forwardly extending portions which are pivoted to said brackets, and means on said crossmember engaging the transverse portion of the spring element for providing a preload thereto.
Claim 5
Dependent Claim
63 words
In a chair as recited in claim 3, wherein the means for preloading the sprinG element is a bracket secured to the central portion of said crossmember, a bolt having a hook on the end extending through said bracket with the hook engaging the center of the transverse portion of the spring element, and a nut on the bolt for preloading said element.
Claim 6
Dependent Claim
39 words
In a chair as recited in claim 4, wherein a leg rest is supported on the seat frame, and means for actuating said linkage for extending said leg rest forwardly of the seat frame in any of its positions.
Claim 7
Dependent Claim
40 words
In a chair as recited in claim 4, wherein said brackets on the base frame have stops extending outwardly thereof in the path of movement of said arms for limiting the forward and rearward tilting movement of the base frame.
Claim 8
Dependent Claim
43 words
In a chair as recited in claim 4, wherein the upper portion of the stud is threaded and wherein a nut is provided on the threads which rests upon the top of the hub and permits adjustment of the height of the chair.
Claim 9
Dependent Claim
45 words
In a chair as recited in claim 7, wherein the lower portion of the stud has a sleeve of low-friction material thereon for engaging the inner wall of the hub to eliminate wear and provide stability to the chair when rotated sidewardly on the hub.
Claim 10
Dependent Claim
32 words
In a chair as recited in claim 8, wherein said base is a casting having a plurality of arms extending from the hub, and casters mounted on the ends of said arms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |