US3842959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Type head for typewriting machine
Assignee: Individual
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Filing: 1973-09-17
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Granted: 1974-10-22
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Expires: 1993-09-17
Abstract
Abstract A type head provided with a central hole for engaging a shaft of a typewriting machine. The type head has a U-shaped spring operable to releasably secure the head to the shaft. The arms of the spring are disposed on both sides of the central hole and engage, under the effect of the spring''s elasticity, a groove provided on the shaft.
Inventors
- 👤 A Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:16
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/60; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45602; Y10T24/45623; Y10T24/45628; Y10T24/45634
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A type head for a typewriting machine having a grooved shaft adapted to mount the type head, said type head comprising, a generally spherical body, the body having a central passageway for receipt of the shaft, a generally U-shaped spring positioned on the body and substantially surrounding an opening of the passageway, the spring having a pair of return-bent arms positioned respectively on both sides of the opening and extending partially thereacross to bite on the central passageway and secure the head to the shaft by engagement of the arms in the groove when the spring is at rest, the head including a pair of converging inclined planes engaged between the arms of the spring, whereby when a force is exerted on the median portion of the spring the same will be moved radially towards the axis of said hole and the arms will be separated one from the other by said planes to release the arms from the groove.
Claim 2
Dependent Claim
160 words
A type head for a typewriting machine having a grooved shaft adapted to mount the type head, said type head comprising, a generally spherical body, the body having a central passageway for receipt of the shaft, a generally U-shaped spring positioned on the body and substantially surrounding an opening of the passageway, the spring having a pair of return-bent arms positioned respectively on both sides of the opening and extending partially thereacross to bite on the central passageway and secure the head to the shaft by engagement of the arms in the groove when the spring is at rest, the head including a pair of converging inclined planes engaged between the arms of the spring, whereby when a force is exerted on the median portion of the spring the same will be moved radially towards the axis of said hole and the arms will be separated one from the other by said planes to release the arms from the groove.
Claim 3
Dependent Claim
62 words
A type head as claimed in claim 1 including a lever pivotally mounted on the body for controlling the position of the spring, said lever being operable between a first position when the spring is at rest and a second upraised position to act on the median portion of the spring thereby moving the same radially towards the axis of said hole.
Claim 4
Dependent Claim
83 words
A type head as claimed in claim 2 in which the lever has a generally tubular formation on the pivotal end thereof, said tubular formation having a bearing surface operable on the spring for movement of the median portion thereof, the bearing surface being formed on only part of the tubular formation such that when the lever is moved to the upraised position the spring will leave the bearing surface and engage the tubular formation to maintain the same in its upraised position.
Claim 5
Dependent Claim
40 words
A type head as claimed in claim 1 in which the spring is formed in the shape of an arc-of-circle, the arms having ends bent to form two portions in the shape of a buckle bearing on the inclined planes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |