US4012008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Window sash balancer
Assignee: YKK Corp
•
Filing: 1975-10-29
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Granted: 1977-03-15
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Expires: 1995-10-29
Abstract
Abstract A window sash balancer is provided for use with slide-out sash windows, double-hung sash windows or the like. The balancer includes a housing, a shaft rotatably supported in the housing and having one end projecting beyond the housing, and a spring disposed within the housing and having one end secured to the housing and the other end to the shaft. The spring normally biases the shaft in one direction of rotation. The shaft has at its projecting end a drum of a frustoconical shape around which there is wound a wire member. A cord is provided in and along a spiral groove defined by adjacent turns of the wound wire member and has one end secured to the drum, the other end being adapted to be connected to a window sash.
Inventors
- 👤 Shuichi Hosooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:51
CPC Classifications
E; E05; E05D; E05D13/00; E05D13/10; E05D13/12; E05D13/1276; E05Y; E05Y2800/00; E05Y2800/26; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/148
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A balancer for use with window sashes, comprising in combination: a. a housing; b. a shaft rotatably supported in said housing and having one end projecting beyond said housing; c. a spring member disposed within said housing and having one end secured to said housing and the other end to said shaft, said spring member being adapted to normally bias said shaft in a one direction of rotation; d. a drum of a frustoconical shape secured to said projecting end of said shaft; e. a wire member wound around and secured to said drum and providing a spiral groove; and f. a cord coiled along said spiral groove and having one end fixed to said drum, the other end being adapted to be secured to the window sash, the unwinding of said cord being in the same direction as the tensioning of said spring member.
Claim 2
Dependent Claim
145 words
A balancer for use with window sashes, comprising in combination: a. a housing; b. a shaft rotatably supported in said housing and having one end projecting beyond said housing; c. a spring member disposed within said housing and having one end secured to said housing and the other end to said shaft, said spring member being adapted to normally bias said shaft in a one direction of rotation; d. a drum of a frustoconical shape secured to said projecting end of said shaft; e. a wire member wound around and secured to said drum and providing a spiral groove; and f. a cord coiled along said spiral groove and having one end fixed to said drum, the other end being adapted to be secured to the window sash, the unwinding of said cord being in the same direction as the tensioning of said spring member.
Claim 3
Dependent Claim
15 words
A balancer according to claim 1, in which said wire member has a round cross-section.
Claim 4
Dependent Claim
26 words
A balancer according to claim 1, in which said wire member is a wire of a parallelogramatic cross-section having a groove extending along its entire length.
Claim 5
Dependent Claim
24 words
A balancer according to claim 1, including means jointly securing one end of each of said wire member and said cord to said drum.
References Cited (Backward Citations)
US1599872A
Cited
GB263185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |