US3661421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair arm structure
Assignee: Dentsply Sirona Inc
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Filing: 1970-09-23
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Granted: 1972-05-09
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Expires: 1990-09-23
Abstract
Abstract A support for chair arms pivoted to the back, respectively at one or both sides, for movement between a lower arm-supporting position and an elevated position to facilitate ingress and egress to and from the seat of the chair. The support includes link means operable in tension to support the arm in said lower position to minimize danger from accidental movement of the arm to a lower position and also provide desired clearance between said arm and chair seat without obstruction by said supporting link means.
Inventors
- 👤 Philip C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:09
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/54; A47C7/543; A47C1/00; A47C1/02; A47C1/022; A47C1/03; A47C7/541; A61; A61G; A61G15/00; A61G15/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
201 words
A chair comprising a seat and back connected to each other, an arm for one side thereof, pivotal means supporting said arm adjacent one end in cantilever manner adjacent one side of said back for pivotal movement of the opposite end of said arm between a lower supporting position for an arm of an occupant and an elevated position to permit unobstructed ingress and egress to and from said side of said seat and back, linkage means positioned adjacent said side of said back and seat and connected at the opposite ends thereof respectively to said pivoted end of said arm and means adjacent the junction of said seat and back, the axis of the pivotal support means for said arm being between the pivotal connection of said linkage means to said arm and the opposite end of said arm, whereby said linkage means is disposed in tension when said arm is in said lower position, and said linkage means being operable to effect support of said arm by said linkage means when in said lower position to provide unobstructed space between said arm and said one side of said seat and also permit raising said arm to said elevated position.
Claim 2
Dependent Claim
201 words
A chair comprising a seat and back connected to each other, an arm for one side thereof, pivotal means supporting said arm adjacent one end in cantilever manner adjacent one side of said back for pivotal movement of the opposite end of said arm between a lower supporting position for an arm of an occupant and an elevated position to permit unobstructed ingress and egress to and from said side of said seat and back, linkage means positioned adjacent said side of said back and seat and connected at the opposite ends thereof respectively to said pivoted end of said arm and means adjacent the junction of said seat and back, the axis of the pivotal support means for said arm being between the pivotal connection of said linkage means to said arm and the opposite end of said arm, whereby said linkage means is disposed in tension when said arm is in said lower position, and said linkage means being operable to effect support of said arm by said linkage means when in said lower position to provide unobstructed space between said arm and said one side of said seat and also permit raising said arm to said elevated position.
Claim 3
Dependent Claim
83 words
The chair according to claim 1 in which said linkage means comprises a pair of links pivotally connected together and said linkage also including positioning means operable to maintain said links in axial alignment and also permit relative pivotal movement of said links for angular positioning of the same with respect to each other and thereby effect a contraction of the distance between the opposite pivoted ends of said linkage means to permit the raising of said arm to said elevated position thereof.
Claim 4
Dependent Claim
74 words
The chair according to claim 2 in which said positioning means comprises a manually slidable sleeve movable to and from a position in which said sleeve encloses the pivotal connection of said two links to each other and thereby locks the same rigidly in axial alignment with each other, and means interconnected to said sleeve and operable to bias the same toward said position in which said sleeve locks said links in axial alignment.
Claim 5
Dependent Claim
40 words
The chair according to claim 2 in which said links when in angular retracted position extend away from the forward surface of said back and thereby not interfere with said seat when said arm is in said elevated position thereof.
Claim 6
Dependent Claim
77 words
The chair according to claim 2 in which said positioning means comprises a spring connected to one of said links and operable to move said links in a direction to dispose said links in axial alignment with each other, said links further including means thereon adjacent the pivotal connection of the links to each other to prevent pivotal movement between said links in one direction from a position in which they are axially aligned with each other.
Claim 7
Dependent Claim
72 words
The chair according to claim 3 in which said back is hingedly connected to the rearward end of said seat for reclining movement of said back rearwardly with respect to said seat, said linkage means being adapted to dispose said arm at an obtuse angle relative to said back when said arm is in the normal lower position thereof and the back is in rearwardly reclined position with respect to said seat.
Claim 8
Dependent Claim
52 words
The chair according to claim 1 in which said linkage means is contractible between the outer ends thereof to permit said ends of said linkage means to be moved toward each other and thereby permit raising saId arm to an elevated position to dispose the same along one side of said back.
Claim 9
Dependent Claim
113 words
The chair according to claim 6 further including brackets respectively disposed along opposite sides of said seat near the rear edge thereof and including pivots connected to said back and one end of said linkage means, said pivots which connect said arms to said back and the pivots by which said linkage means are connected to said arms being aligned approximately parallel to the line of pivots on said brackets, whereby when said back is tilted to reclining position, said arm is disposed at a greater angle to the plane of the back than when said back is upright with respect to the seat and said arm is in said lower position thereof.
Claim 10
Dependent Claim
72 words
The chair according to claim 6 in which said linkage means is adapted to support said arm rigidly relative to said back when said back is disposed in a reclining position, whereby said outer free end of said arm may be engaged by an occupant safely to assist the occupant in raising himself from resting upon said lowered back incident to the back being raised toward said normal substantially upright position thereof.
Claim 11
Dependent Claim
104 words
The chair according to claim 1 in which said linkage means comprises a pair of links pivotally connected together and said positioning means comprises latch means adjacent the pivotal connection of said links, said latch means comprising a spring-pressed detent on one link engageable with cooperating means on the other link when the links are in axial alignment and said latch means being readily releasable manually to permit angular positioning of the links relative to each other and thereby effect a contraction of the distance between the opposite ends of said linkage means to permit raising of said arm to said elevated position thereof.
Claim 12
Dependent Claim
44 words
The chair according to claim 10 in which said spring-pressed detent is movable axially relative to the link which supports the same and the adjacent end of the other link has seat means to receive said detent when said links are in axial alignment.
Claim 13
Dependent Claim
19 words
The chair according to claim 11 in which said means to receive said detent is a notched cam surface.
Claim 14
Dependent Claim
80 words
The chair according to claim 12 in which the pivotal connection between said links comprises a tongue on the end of one link and a slot in the end of the other link receiving said tongue, and a pivot pin extending transversely through said tongue and the end portions of said other link which define said slot, said notched cam surface being on the outer end of said tongue and said detent projecting outwardly from the base of said slot.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |