Patent US4157616A successfully refreshed from Google Patents.
US4157616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand tools
Assignee: Individual
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Filing: 1977-12-20
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Granted: 1979-06-12
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Expires: 1997-12-20
Abstract
Abstract A hand tool of the kind comprising a pointed edge or blade, and a cover protecting the latter in the non-operative position thereof but intended to be swung away to expose the point in the operative position of the tool. Means are arranged to lock the cover to prevent it from being inadvertently moved to the point-exposing position but to allow the cover to be swung away readily to expose the point by using one hand only, when the point is to be used.
Inventors
- 👤 Karl G. Lundqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
B; B26; B26B; B26B29/00; B26B29/02; B26B29/025; B26B27/00; B26B27/007
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
An improvement in hand tools of the kind comprising a sharp or pointed member, (such as the blade of a knife, or a spike) and a cover enclosing and pivotally connected to said sharp or pointed member and arranged to be swung outwards from a position wherein it protects said sharp or pointed member to position wherein it exposes said member, the improvement comprising a pivot shaft on said sharp or pointed member rigidly connected to said cover, an elongated aperture formed in said sharp or pointed member, said pivot shaft passing freely through said aperture, a compression spring inserted in said aperture, one end of said spring abutting against said pivot shaft, means being provided to lock said cover in its protective position said cover arranged to be displaced from said protective position only after having been displaced from the locked position in a direction inwards, towards said sharp or pointed member, at right angles to said pivot shaft of said cover.
Claim 2
Dependent Claim
163 words
An improvement in hand tools of the kind comprising a sharp or pointed member, (such as the blade of a knife, or a spike) and a cover enclosing and pivotally connected to said sharp or pointed member and arranged to be swung outwards from a position wherein it protects said sharp or pointed member to position wherein it exposes said member, the improvement comprising a pivot shaft on said sharp or pointed member rigidly connected to said cover, an elongated aperture formed in said sharp or pointed member, said pivot shaft passing freely through said aperture, a compression spring inserted in said aperture, one end of said spring abutting against said pivot shaft, means being provided to lock said cover in its protective position said cover arranged to be displaced from said protective position only after having been displaced from the locked position in a direction inwards, towards said sharp or pointed member, at right angles to said pivot shaft of said cover.
Claim 3
Dependent Claim
43 words
An improvement as claimed in claim 1, comprising a grippping edge formed on said cover, said gripping edge arranged, when said cover is pressed against a support for the purpose of being swung outwards, to facilitate said outwards swinging movement of said cover.
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) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |