Patent US3851907A successfully refreshed from Google Patents.
US3851907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic counterbalance
Assignee: Motors Liquidation Co
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Filing: 1973-04-26
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Granted: 1974-12-03
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Expires: 1993-04-26
Abstract
Abstract A telescopic counterbalance for a hinged closure includes inner and outer telescopically related members. An internal compression spring biases the members apart to their telescopic outward position. The members are located in this position by the engagement of a collapsed rib located intermediate of the outer member with a plurality of spaced depressions located intermediate of the inner member. The members are releasably retained in this position by a spring clip on the outer member cooperating with the collapsed rib. The inner flared end of the inner member engages intermediately of the outer member and a plastic bushing on the inner end of the outer member engages intermediately of the inner member for improved bending strength. A wooden dowel mounted internally of the outer member extends through the compression spring and supports a compression spring on the free end thereof. This is engaged by a spring seat on the inner member during the terminal inward movement of the inner member to provide a pop-open force or additional opening force upon initial telescopic outward movement of the members.
Inventors
- 👤 B Sandor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:16
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/1041; E05F1/105; E05F1/1058; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/53; E05Y2900/546; Y; Y10; Y10T; Y10T292/00; Y10T292/28; Y10T292/65
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
137 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, resilient counterbalance means seating between the members to bias the members in a telescopic outward direction and bias the closure to an open position, booster spring means mounted on one of the members, and abutment means mounted on the other member, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during final inward telescopic movement of the members to provide a popopen force cooperating with the resilient counterbalance means in initially biasing the closure to a partially open position.
Claim 2
Dependent Claim
137 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, resilient counterbalance means seating between the members to bias the members in a telescopic outward direction and bias the closure to an open position, booster spring means mounted on one of the members, and abutment means mounted on the other member, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during final inward telescopic movement of the members to provide a popopen force cooperating with the resilient counterbalance means in initially biasing the closure to a partially open position.
Claim 3
Dependent Claim
146 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, main counterbalance spring means seating between the members to bias the members in a telescopic outward direction and bias the closure to an open position, booster spring means mounted on one of the members and located within the main spring means, and abutment means mounted on the other member, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during the terminal inward telescopic movement of the members to provide a pop-open force cooperating with the main spring means in initially biasing the closure to a partially open position.
Claim 4
Dependent Claim
146 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, main counterbalance spring means seating between the members to bias the members in a telescopic outward direction and bias the closure to an open position, booster spring means mounted on one of the members and located within the main spring means, and abutment means mounted on the other member, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during the terminal inward telescopic movement of the members to provide a pop-open force cooperating with the main spring means in initially biasing the closure to a partially open position.
Claim 5
Dependent Claim
157 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, main spring means within the members seating between the outer ends of the members to bias the members in a telescopic outward direction and bias the closure to an open position, booster spring means, means mounting the booster spring means adjacent the inner end of one of the members, and abutment means mounted on the other member adjacent the outer end thereof, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during inward telescopic movement of the members to provide a pop-open force cooperating with the main spring means in initially biasing the closure to a partially open position.
Claim 6
Dependent Claim
157 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, main spring means within the members seating between the outer ends of the members to bias the members in a telescopic outward direction and bias the closure to an open position, booster spring means, means mounting the booster spring means adjacent the inner end of one of the members, and abutment means mounted on the other member adjacent the outer end thereof, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during inward telescopic movement of the members to provide a pop-open force cooperating with the main spring means in initially biasing the closure to a partially open position.
Claim 7
Dependent Claim
184 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each otheR, means securing the outer ends of the members respectively to the support and the closure, spring seat means located adjacent the outer ends of the members internally thereof, main spring means seating on the spring seat means to bias the members in a telescopic outward direction and bias the closure to an open position, an annular member mounted on the spring seat means of one member and extending through the main spring means to adjacent the inner end of said one member to control snaking of said main spring means, booster spring means mounted on said annular member, and abutment means mounted on the other member, the booster spring means being engaged and compressed relative to said annular member by the abutment means during final inward telescopic movement of the members to provide a pop-open force cooperating with the main spring means in initially biasing the closure to a partially open position.
Claim 8
Dependent Claim
184 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each otheR, means securing the outer ends of the members respectively to the support and the closure, spring seat means located adjacent the outer ends of the members internally thereof, main spring means seating on the spring seat means to bias the members in a telescopic outward direction and bias the closure to an open position, an annular member mounted on the spring seat means of one member and extending through the main spring means to adjacent the inner end of said one member to control snaking of said main spring means, booster spring means mounted on said annular member, and abutment means mounted on the other member, the booster spring means being engaged and compressed relative to said annular member by the abutment means during final inward telescopic movement of the members to provide a pop-open force cooperating with the main spring means in initially biasing the closure to a partially open position.
Claim 9
Dependent Claim
149 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, resilient counterbalance means seating between the members to bias the members in a telescopic outward direction and bias the closure to an open position, releasable detent means releasably locating the members in a telescopic outward position, booster spring means mounted on one of the members, and abutment means mounted on the other member, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during final inward telescopic movement of the members to provide a pop-open force cooperating with the resilient counterbalance means in initially biasing the closure to a partially open position.
Claim 10
Dependent Claim
149 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, a pair of telescopic annular members movable inwardly and outwardly of each other, means securing the outer ends of the members respectively to the support and the closure, resilient counterbalance means seating between the members to bias the members in a telescopic outward direction and bias the closure to an open position, releasable detent means releasably locating the members in a telescopic outward position, booster spring means mounted on one of the members, and abutment means mounted on the other member, the booster spring means being normally in a free position and being engaged and compressed by the abutment means only during final inward telescopic movement of the members to provide a pop-open force cooperating with the resilient counterbalance means in initially biasing the closure to a partially open position.
Claim 11
Dependent Claim
223 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, inner and outer telescopic annular members movable between extended and retracted positions relative to each other, means securing the outer ends of the members respectively to the support and to the closure, resilient counterbalance means seating between the members to bias the members to a telescopic extended position and bias the closure to an open position, resiliently deflectable detent means mounted on the outer member, means on the inner member engageable with the detent means and movable therebeyond to provide a releasable detent holding the members in a telescopic extended position against movement to a telescopic retracted position, booster spring means mounted on one of the members, abutment means mounted on the other member, the booster spring means being engaged and compressed by the abutment means during movement of the members to a telescopic retracted position to provide a pop-open force cooperating with the resilient counterbalance means in initially biasing the members to telescopic extended position and biasing the closure to a partially open position, and means on the outer member engageable with the means on the inner member upon movement of the means on the inner member beyond the detent means to provide a stop in the extended position of the annular members.
Claim 12
Dependent Claim
223 words
A telescopic counterbalance for a closure movable between open and closed positions relative to a support comprising, in combination, inner and outer telescopic annular members movable between extended and retracted positions relative to each other, means securing the outer ends of the members respectively to the support and to the closure, resilient counterbalance means seating between the members to bias the members to a telescopic extended position and bias the closure to an open position, resiliently deflectable detent means mounted on the outer member, means on the inner member engageable with the detent means and movable therebeyond to provide a releasable detent holding the members in a telescopic extended position against movement to a telescopic retracted position, booster spring means mounted on one of the members, abutment means mounted on the other member, the booster spring means being engaged and compressed by the abutment means during movement of the members to a telescopic retracted position to provide a pop-open force cooperating with the resilient counterbalance means in initially biasing the members to telescopic extended position and biasing the closure to a partially open position, and means on the outer member engageable with the means on the inner member upon movement of the means on the inner member beyond the detent means to provide a stop in the extended position of the annular members.
Claim 13
Dependent Claim
53 words
The combination recited in claim 5 wherein the releasable detent means includes spaced resiliently deflectable means on one of the annular members normally located adjacent the other annular member, and means on the other annular member engageable with and movable past the deflectable means in the telescopic outward position of the annular members.
Claim 14
Dependent Claim
98 words
The combination recited in claim 5 wherein the releasable detent means includes resiliently deflectable means on one of the telescopic members normally located adjacent the other annular member, and stop means on the other annular member engageable with and bypassing the resiliently deflectable means during outward movement of the annular meMbers relative to each other, the one annular member including second stop means engageable with the first stop means on the other annular member after the first stop means has bypassed the resiliently deflectable means to thereby provide a fixed stop limiting outward telescopic movement of the members.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |