US3907190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stapler with a punch mechanism
Assignee: Individual
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Filing: 1974-02-22
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Granted: 1975-09-23
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Expires: 1994-02-22
Abstract
Abstract A hand-operated stapler of the type comprising a base having an anvil die adjacent its front end, an open-top staple magazine pivotally coupled at its rear end to the base, and a lever also pivotally coupled to the base to depress the staple magazine onto the anvil die of the base whereby the foremost one of the staples within the magazine is dispensed therefrom to penetrate sheets of paper or the like and is further clinched by the anvil die to hold the sheets together. The stapler characterized in that the staples within the staple magazine are urged forwardly by a feed element slidably mounted therein and a helical tension spring extending between the front end of the feed element and the front end of the lever, in such a manner that the spring is substantially folded over the rear end of the feed element.
Inventors
- 👤 Yoshio Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:12
CPC Classifications
B; B25; B25C; B25C5/00; B25C5/02; B25C5/0221; B25C5/0242; B25C5/025; B25C5/0214
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
263 words
In a stapler of the type including a base having an anvil die adjacent one end thereof, an open-top staple magazine having a staple dispensing aperture provided in a distal end of a bottom wall thereof, said magazine being pivoted at its proximal end to the other end of said base so as to be turnable up and down relative thereto, a lever having a staple ejector at its distal end and also pivotally connected at its proximal end to the other end of said base so as to be turnable up and down relative thereto, said lever being adapted to drive each foremost staple accommodated within said staple magazine out of said dispensing aperture by said staple ejector such that the dispensed staple is clinched by said anvil die to hold layers of penetrable material together, a feed element slidably mounted within said staple magazine and having a front end facing the staples accommodated therein, and spring means urging said feed element toward said dispensing aperture to feed the staples toward the dispensing aperture: the improvement wherein said spring means comprises a tension spring connected at one end thereof to said front end of said feed element and at the other end thereof to said distal end of the lever, said tension spring extending from said front end to the rear end of the feed element remote from said front end along the length of the feed element and being substantially folded over said rear end to urge the feed element toward the dispensing aperture in the normal position of the stapler.
Claim 2
Dependent Claim
263 words
In a stapler of the type including a base having an anvil die adjacent one end thereof, an open-top staple magazine having a staple dispensing aperture provided in a distal end of a bottom wall thereof, said magazine being pivoted at its proximal end to the other end of said base so as to be turnable up and down relative thereto, a lever having a staple ejector at its distal end and also pivotally connected at its proximal end to the other end of said base so as to be turnable up and down relative thereto, said lever being adapted to drive each foremost staple accommodated within said staple magazine out of said dispensing aperture by said staple ejector such that the dispensed staple is clinched by said anvil die to hold layers of penetrable material together, a feed element slidably mounted within said staple magazine and having a front end facing the staples accommodated therein, and spring means urging said feed element toward said dispensing aperture to feed the staples toward the dispensing aperture: the improvement wherein said spring means comprises a tension spring connected at one end thereof to said front end of said feed element and at the other end thereof to said distal end of the lever, said tension spring extending from said front end to the rear end of the feed element remote from said front end along the length of the feed element and being substantially folded over said rear end to urge the feed element toward the dispensing aperture in the normal position of the stapler.
Claim 3
Dependent Claim
35 words
The improvement as defined in claim 1, wherein said rear end of said feed element is bent into a curved edge for slidable smooth engagement with said tension spring where the latter is folded therearound.
Claim 4
Dependent Claim
46 words
The improvement as defined in claim 1, wherein said feed element includes a pair of lateral projections which are slidably received in respective guide slots provided in side walls of said staple magazine, whereby said feed element is prevented from detachment out of said stAple magazine.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |