Patent US4039183A successfully refreshed from Google Patents.
US4039183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrist exercise and strengthening device
Assignee: RITSHYO KOGYO KK
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Filing: 1976-04-21
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Granted: 1977-08-02
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Expires: 1996-04-21
Abstract
Abstract A device is provided for exercising and strengthening the human wrist, which comprises a concave trough with two parallel spaced members projecting from one end thereof and a grip rotatably mounted on the elongated member. Springs provide a force which rotates the grip away from the longitudinal axis of the concave trough. The device fits on the human forearm directly above the wrist and provides wrist strengthening exercises for the user by means of the grip being biased by the force of the springs against the flexing of the wrist.
Inventors
- 👤 Hiroshi Sakurada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:27
CPC Classifications
A; A63; A63B; A63B23/00; A63B23/035; A63B23/12; A63B23/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
A device for exercising and strengthening the human wrist which comprises a concave, elongated trough adapted to fit on the human forearm immediately above the wrist, two spaced projecting members projecting from the ends of the respective sides of the trough parallel to the longitudinal axis of the trough and terminating in junctures with two rotatably mounted extending members which project generally in the same direction as said spaced, projecting members, said junctures being at a distance from said trough such that they coincide in position with the wrist of the user when the user's hand engages a common grip means and the trough is fitted on the forearm above the wrist, said extending members themselves terminating in said common grip means which is mounted at the ends thereof remote from said projecting members and transverse to said longitudinal axis of the trough, said extending members being biased away from a linear relationship with said projecting members by spring means disposed at the respective junctures of said extending and projecting members, and strap means attached to said elongated trough for securing the forearm therein.
Claim 2
Independent Claim
184 words
A device for exercising and strengthening the human wrist which comprises a concave, elongated trough adapted to fit on the human forearm immediately above the wrist, two spaced projecting members projecting from the ends of the respective sides of the trough parallel to the longitudinal axis of the trough and terminating in junctures with two rotatably mounted extending members which project generally in the same direction as said spaced, projecting members, said junctures being at a distance from said trough such that they coincide in position with the wrist of the user when the user's hand engages a common grip means and the trough is fitted on the forearm above the wrist, said extending members themselves terminating in said common grip means which is mounted at the ends thereof remote from said projecting members and transverse to said longitudinal axis of the trough, said extending members being biased away from a linear relationship with said projecting members by spring means disposed at the respective junctures of said extending and projecting members, and strap means attached to said elongated trough for securing the forearm therein.
Claim 3
Dependent Claim
37 words
The device of claim 1 which further includes stop means mounted on each of said projecting members for preventing the spring biased movement of said extending members beyond a predetermined point in relationship to said projecting member.
Claim 4
Dependent Claim
61 words
The device of claim 1 wherein each of said projecting members projects from said trough at an angle of between about 10° and 45° from the longitudinal axis thereof, and said extending members project from said projecting members at an angle of about 0° to 30° from the axis thereof, the sum of said angles being however about 30° to 60°.
Claim 5
Dependent Claim
22 words
The device of claim 3 wherein the angle of said projecting member is about 25° and said extending member is about 20°.
Claim 6
Dependent Claim
36 words
The device of claim 1 wherein said strap means extends transverse to the longitudinal axis of said trough and is of sufficient length to circumscribe both the users forearm and said trough in a winding relationship.
Claim 7
Dependent Claim
18 words
The device of claim 1 wherein said spring means has a force of about 5 to 20 kg.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |