US4005841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair base arm end cap
Assignee: Steelcase Inc
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Filing: 1975-12-31
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Granted: 1977-02-01
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Expires: 1995-12-31
Abstract
Abstract The specification discloses an article of furniture, specifically a chair base, in which the open sockets at the ends of the base arms are capped by a cap including a cover portion and a plug portion extending into the arm socket, the plug extending over and beyond the top of the pintle socket which is inside the leg and including a barb extending downwardly behind a portion of the pintle socket, the barb being sufficiently flexible as to allow it to slide over the pintle socket and slip down behind at least a portion of it whereby insertion of the cap is facilitated but removal is not. The plug also includes inclined locking ridges which engage the interior surface of the socket to further secure the cap in place.
Inventors
- 👤 Thomas E. Rensland
- 👤 Robert C. Clawson
- 👤 Alexander A. Karrip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:34
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/002; A47C7/004
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
129 words
In an article of furniture having a first socket with an opening to be covered, the improvement comprising: said first socket including a detent member therein extending from an interior surface thereof; a cap including a cover portion for covering the opening of said first socket and a plug portion extending from said cover portion; said plug extending into said first socket and over and beyond said detent member; said plug including a barb extending downwardly therefrom behind and adjacent said detent member; said barb being sufficiently flexible relative to said plug to allow it to slide over said detent member and being sufficiently resilient to slip down behind said detent member after it has slid over it, whereby insertion of said plug is facilitated whereas removal is not.
Claim 2
Dependent Claim
129 words
In an article of furniture having a first socket with an opening to be covered, the improvement comprising: said first socket including a detent member therein extending from an interior surface thereof; a cap including a cover portion for covering the opening of said first socket and a plug portion extending from said cover portion; said plug extending into said first socket and over and beyond said detent member; said plug including a barb extending downwardly therefrom behind and adjacent said detent member; said barb being sufficiently flexible relative to said plug to allow it to slide over said detent member and being sufficiently resilient to slip down behind said detent member after it has slid over it, whereby insertion of said plug is facilitated whereas removal is not.
Claim 3
Dependent Claim
21 words
The article of claim 1 in which said barb slopes downwardly relative to said plug and back towards said cover portion.
Claim 4
Dependent Claim
67 words
The article of claim 2 comprising a chair base with radiating arms, said first socket with an opening comprising the end portion of each said arm; said detent comprising a pintle socket extending through the bottom of said arm and into the interior of said first socket, there being a space between the top of said pintle socket and the upper interior surface of said first socket.
Claim 5
Dependent Claim
43 words
The article of claim 3 in which said plug includes a first portion adjacent said cover having peripheral dimensions corresponding generally to the interior dimensions of said first socket and an extending portion extending from said first portion out over said detent member.
Claim 6
Dependent Claim
94 words
The article of claim 4 in which at least said first portion of said plug includes at least one generally annular locking ridge having peripheral dimensions slightly greater than the interior dimensions of said first socket such that a friction fit is effected between said locking ridge and the interior of said first socket; said annular locking ridge including a sloped lead surface sloping upwardly and rearwardly relative to the direction in which said cap is inserted into said first socket such that insertion of said end cap into said first socket is facilitated.
Claim 7
Dependent Claim
25 words
The article of claim 5 in which there are a plurality of said annular locking ridges at least on said first portion of said plug.
Claim 8
Dependent Claim
33 words
The article of claim 6 in which each said lead surface on each said annular locking ridge is oriented at approximately 60° to the longitudinal axis of said plug of said end cap.
Claim 9
Dependent Claim
46 words
The article of claim 7 in which said lead surface extends to a generally rounded crest and said rounded crest extends to a back surface, opposite said lead surface, said back surface being generally perpendicular to the longitudinal axis of said plug of said end cap.
Claim 10
Dependent Claim
29 words
The article of claim 8 in which semi-annular ridges are located on said extending portion of said plug such that they also engage the interior surface of said socket.
Claim 11
Dependent Claim
15 words
The article of claim 9 in which said end cap comprises a molded plastic member.
Claim 12
Dependent Claim
16 words
The article of claim 10 in which said end cap comprises a molded polypropylene copolymer plastic.
Claim 13
Dependent Claim
72 words
The article of claim 1 in which said article comprises a chair base with radiating arms, said first socket with an opening comprising the end portion of each said arm; said detent comprising a pintle socket member extending through the bottom of said arm and into the interior of said first socket, there being a space between the top of said pintle socket and the upper interior surface of said first socket.
Claim 14
Dependent Claim
43 words
The article of claim 12 in which said plug includes a first portion adjacent said cover having peripheral dimensions corresponding generally to the interior dimensions of said first socket and an extending portion extending from said first portion out over said detent member.
Claim 15
Dependent Claim
94 words
The article of claim 13 in which at least said first portion of said plug includes at least one generally annular locking ridge having peripheral dimensions slightly greater than the interior dimensions of said first socket such that a friction fit is effected between said locking ridge and the interior of said first socket; said annular locking ridge including a sloped lead surface sloping upwardly and rearwardly relative to the direction in which said cap is inserted into said first socket such that insertion of said end cap into said first socket is facilitated.
Claim 16
Dependent Claim
25 words
The article of claim 14 in which there are a plurality of said annular locking ridges at least on said first portion of said plug.
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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |