Patent US4236824A successfully refreshed from Google Patents.
Patent US3871704A successfully refreshed from Google Patents.
US3871704A
Expired / Lapsed
US
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High-low back for chair
Assignee: La Z Boy Inc
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Filing: 1973-05-29
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Granted: 1975-03-18
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Expires: 1993-05-29
Abstract
Abstract A lounging chair usually has a high back extending upwardly from a seat so as to be engaged by the shoulders and head of an occupant when reclining in the chair. Such a high back on a chair usually does not fit well in a room having low backs on the davenport, setees, chairs and like. The present invention pertains to a lounging chair which has a low hollow back in which an extensible back section is pivotally mounted for swinging movement rearwardly, upwardly and forwardly in extension of the top of the back frame when the back is tilted toward reclined position. After the back section is moved to extended position it is locked to the back frame and will move therewith to reclined position moving the seat forwardly and upwardly. The initial movement of the seat forwardly unlatches the back section and permits the back frame to move to seating position which returns the back section to within the back frame where it is locked when the back frame is in seating position. A leg rest may be extended forwardly when the back frame is reclined to provide a complete reclining position for the chair occupant.
Inventors
- 👤 Edwin J Shoemaker
- 👤 Harold P Ruble
- 👤 David B White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:49
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/036; A47C1/037
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
176 words
In a chair, a base frame, a seat frame, and a back frame, linkage means for interconnecting said back and seat frames for movement relative to each other, said back frame having spaced side members forming a hollow back which is open rearwardly, a back section, upper and lower pairs of links, a pair of plates secured to the inner surfaces of said side members, pivot means securing the upper ends of said pairs of links to said pair of plates and the lower ends to said back section, said pair of plates have an arcuate slot located adjacent to the pivots thereon which support the lower pair of links, said lower pair of links having a longitudinal slot crossing said arcuate slots, operating rods having means at the upper ends projecting through both said slots, and means connecting the lower ends of said operating rods to said seat frame the movement of which relative to the back frame produces the movement of said operating rods to move the back section relative to said back frame.
Claim 2
Dependent Claim
176 words
In a chair, a base frame, a seat frame, and a back frame, linkage means for interconnecting said back and seat frames for movement relative to each other, said back frame having spaced side members forming a hollow back which is open rearwardly, a back section, upper and lower pairs of links, a pair of plates secured to the inner surfaces of said side members, pivot means securing the upper ends of said pairs of links to said pair of plates and the lower ends to said back section, said pair of plates have an arcuate slot located adjacent to the pivots thereon which support the lower pair of links, said lower pair of links having a longitudinal slot crossing said arcuate slots, operating rods having means at the upper ends projecting through both said slots, and means connecting the lower ends of said operating rods to said seat frame the movement of which relative to the back frame produces the movement of said operating rods to move the back section relative to said back frame.
Claim 3
Dependent Claim
86 words
In a chair as recited in claim 1, wherein said arcuate slots extend downwardly at the bottom for receiving said projecting means for locking said back section in said hollow back of the back frame, the movement of the seat frame relative to the back frame upon initially moving the back frame from seating position moves the projecting means upwardly into the arcuate portion of said slots for releasing the back section so that it may swing into a position of extension with the back frame.
Claim 4
Dependent Claim
56 words
In a chair as recited in claim 1, wherein said arcuate slots extend upwardly at the top for receiving said projecting means for locking said back section in extension of said back frame by the further movement of said seat frame toward reclining position without any longitudinal movement between said back frame and said operating rod.
Claim 5
Dependent Claim
47 words
In a chair as recited in claim 3, wherein said linkage means interconnects the said side members of the back frame with the seat frame to cause it to move further forwardly and upwardly when the back section and back frame are moved to complete reclined position.
Claim 6
Dependent Claim
74 words
In a chair as recited in claim 4, wherein a cross bar is adjustably secured to the lower ends of said operating rods, and wherein said means connecting the operating rods to said seat frame are bellcranks having a pair of angularly disposed arms with pivot means therebetween which are secured to opposite sides of said seat frame with one arm of each said pair secured to said cross bar near the ends thereof.
Claim 7
Dependent Claim
112 words
In a chair as recited in claim 1, wherein brackets are provided at each side of the seat frame near the forward and rear portions thereof, bellcranks having a pair of angularly disposed arms thereon extending from a central portion, pivot means for securing the central portion of said bellcranks to said rear brackets with the arms disposed upwardly and downwardly, a cross bar pivoted to the downwardly extending arms of the bellcranks, and a first pair of links pivoted to the upwardly extending arms of said bellcranks about which the bellcranks pivot when the seat is initially moved to have the downwardly extending arms of the bellcranks actuate said operating rods.
Claim 8
Dependent Claim
82 words
In a chair as recited in claim 6, wherein a lever is secured at each outer side of the back frame, means for pivoting said levers to the base frame with a portion extending downwardly therefrom, a second pair of links each pivoted to the downwardly extending end of said levers and having a slot therein, and a bushing on the forward end of each of said first pair of links which extend into each of said slots and are movable therein.
Claim 9
Dependent Claim
78 words
In a chair as recited in claim 6, wherein a second pair of bellcranks each having a pair of angularly disposed arms with the end of one arm pivoted to said base frame, a third pair of links each connected at the junction of the arms of said second pair of bellcranks and to the forward brackets on the seat frame for producing the upward and forward movement thereof when the back frame is tilted to inclined position.
Claim 10
Dependent Claim
65 words
In a chair as recited in claim 8, wherein a hook link is pivoted to each of said second links, and fourth links pivoted to the other arms of the second bellcranks and to the hook links to cause the latter to be swung into engagement with said bushings to retain the second links against movement until the back section is moved to raised position.
Claim 11
Dependent Claim
49 words
In a chair as recited in claim 8, wherein spaced scissors type of link means are supported on the seat frame front brackets and actuated by a shaft supported on the base frame, and a leg rest supported on the forward ends of said scissors type of link means.
References Cited (Backward Citations)
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US2984293A
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US3233938A
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US3357739A
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US3638995A
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |