US3703838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
An improved pawl
Assignee: Suwa Seikosha KK
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Filing: 1971-01-29
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Granted: 1972-11-28
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Expires: 1991-01-29
Abstract
Abstract An arm holds a pallet jewel against a ratchet wheel which is thinner than the pallet jewel, and the arm is fitted with fingers which lie on either side of, but do not touch, the ratchet wheel. In case of mechanical shock to the system in a direction transverse to the ratchet wheel, the fingers come into contact with the face of the wheel and prevent disengagement of the jewel from the wheel.
Inventors
- 👤 Yuki Tsuruishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
G; G04; G04B; G04B11/00; G04B11/02; G04B11/04; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2133; Y10T74/2141
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
An improved pawl for driving a ratchet wheel, comprising a pallet jewel for engaging said ratchet wheel, the thickness of said pallet jewel in the direction parallel to the axis of said ratched wheel being greater than that of said ratchet wheel, a flexible arm supporting said pallet jewel and urging said pallet jewel against said ratchet wheel, and two fingers extending from said arm, each of said fingers flanking with clearance one face of said ratchet wheel, said fingers thereby serving to prevent disengagement of said pallet jewel from said ratchet wheel by accidental shock in a direction transverse to the plane of said ratchet wheel and to hold said jewel firmly in place in said arm.
Claim 2
Dependent Claim
118 words
An improved pawl for driving a ratchet wheel, comprising a pallet jewel for engaging said ratchet wheel, the thickness of said pallet jewel in the direction parallel to the axis of said ratched wheel being greater than that of said ratchet wheel, a flexible arm supporting said pallet jewel and urging said pallet jewel against said ratchet wheel, and two fingers extending from said arm, each of said fingers flanking with clearance one face of said ratchet wheel, said fingers thereby serving to prevent disengagement of said pallet jewel from said ratchet wheel by accidental shock in a direction transverse to the plane of said ratchet wheel and to hold said jewel firmly in place in said arm.
Claim 3
Dependent Claim
17 words
The improved pawl as defined in claim 1, wherein said fingers are an extension of said arm.
Claim 4
Dependent Claim
13 words
The pawl as defined in claim 1, wherein said fingers are essentially planar.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |