US3710634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tension device for chain drive
Assignee: Tsubakimoto Chain Co
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Filing: 1971-06-15
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Granted: 1973-01-16
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Expires: 1991-06-15
Abstract
Abstract A tension device includes a cylinder with a chamber therein. A plunger having a rubber shoe on the outer end thereof slides within the cylinder and is urged outwardly therefrom by a coil spring. A pinion is eccentrically mounted to engage with a longitudinal rack on the surface of the plunger and is urged by a clip spring to move the plunger into the cylinder. The force of the coil spring is greater than that of the clip spring to normally urge the plunger outwardly from the cylinder and the rack out of engagement with the pinion due to the eccentric mounting of the pinion.
Inventors
- 👤 H Tamaru
- 👤 H Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:12
CPC Classifications
F; F16; F16H; F16H7/00; F16H7/08; F16H7/0848; F16H2007/0802; F16H2007/0804; F16H2007/0806; F16H2007/0889; F16H2007/0891
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A tension device for imparting tension to the chain of a drive chain system, said device comprising a cylinder adapted to be mounted adjacent said system, said cylinder having a cylinder chamber therein; a plunger mounted for sliding movement within said chamber, said plunger having a longitudinal rack on the outer surface thereof; a chain engaging shoe mounted on the outer end of said plunger; means for urging said plunger outwardly of said chamber; an eccentrically mounted pinion positioned to engage said rack; and means for urging said pinion into engagement with said rack to move said plunger into said chamber.
Claim 2
Dependent Claim
101 words
A tension device for imparting tension to the chain of a drive chain system, said device comprising a cylinder adapted to be mounted adjacent said system, said cylinder having a cylinder chamber therein; a plunger mounted for sliding movement within said chamber, said plunger having a longitudinal rack on the outer surface thereof; a chain engaging shoe mounted on the outer end of said plunger; means for urging said plunger outwardly of said chamber; an eccentrically mounted pinion positioned to engage said rack; and means for urging said pinion into engagement with said rack to move said plunger into said chamber.
Claim 3
Dependent Claim
34 words
A device as claimed in claim 1, further comprising a slot extending through said cylinder into said chamber, and a shaft extending transversely across said slot, said pinion being eccentrically mounted on said shaft.
Claim 4
Dependent Claim
38 words
A device as claimed in claim 2, wherein said means for urging said plunger comprises a coil spring, and said means for urging said pinion comprises a clip spring, said coil spring being stronger than said clip spring.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |