Patent US3961519A successfully refreshed from Google Patents.
US3961519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer for sheet metal
Assignee: Individual
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Filing: 1974-12-19
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Granted: 1976-06-08
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Expires: 1994-12-19
Abstract
Abstract A hammer for use in sheet metal working has a handle and a hammer head having at one end face a plurality of circumferentially inclined face sections and an adapter having at the rear thereof inclined face sections complementary to the first inclined face sections for causing the adapter to rotate by sliding along both inclined face sections. The hammer head and the adapter are encircled by an elastic tubular sleeve member or coil spring for rotably connecting said head and adapter and for elastically holding said adapter in a return position with respect to the rotation to be caused at the time of striking. On the striking face of the adapter, there may be provided a plurality of projecting stripes.
Inventors
- 👤 Yoshio Kurata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:26
CPC Classifications
B; B21; B21D; B21D1/00; B21D1/06; B21D31/00; B21D31/06; B25; B25D; B25D1/00; B25D1/02; B25D2222/00; B25D2222/54; B25D2222/57; B25D2250/00; B25D2250/225; Y; Y10; Y10S; Y10S72/00; Y10S72/705
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A hammer head for working sheet metal to straighten pieces of sheet metal which have been deformed, causing surface bumps and depressions, said hammer head comprising: a. an elongated hammer head body with a circular front surface piece at the front of said body; b. a plurality of hammer face sections at said front surface piece, each section extending substantially from the circular center of said circular front surface piece and slanting towards the axis of elongation of said body, each section being similar to the other sections and slanting in the same direction as viewed when traveling around the periphery of said circular front surface piece; c. a cylindrical adapter in contact with said front surface piece having adapter face sections corresponding to the hammer face sections and in contact therewith; and, d. resilient means holding said adapter and front face pieces in contact, whereby, when said hammer head strikes a workpiece, the adapter face sections slide on the hammer face sections imparting a sliding and turning motion at the time of the hammer blow.
Claim 2
Dependent Claim
176 words
A hammer head for working sheet metal to straighten pieces of sheet metal which have been deformed, causing surface bumps and depressions, said hammer head comprising: a. an elongated hammer head body with a circular front surface piece at the front of said body; b. a plurality of hammer face sections at said front surface piece, each section extending substantially from the circular center of said circular front surface piece and slanting towards the axis of elongation of said body, each section being similar to the other sections and slanting in the same direction as viewed when traveling around the periphery of said circular front surface piece; c. a cylindrical adapter in contact with said front surface piece having adapter face sections corresponding to the hammer face sections and in contact therewith; and, d. resilient means holding said adapter and front face pieces in contact, whereby, when said hammer head strikes a workpiece, the adapter face sections slide on the hammer face sections imparting a sliding and turning motion at the time of the hammer blow.
Claim 3
Dependent Claim
48 words
A hammer head as claimed in claim 1, wherein said resilient means comprises a tubular elastic sleeve with front and rear ends, secured at said ends to said hammer head body and to said adapter, so arranged as to return said adapter to its original position after turning.
Claim 4
Dependent Claim
46 words
A hammer head as claimed in claim 1, wherein said resilient means comprises a spring with front and rear ends secured at said ends to said hammer head body and to said adapter, so coiled as to return the adapter to its original position after turning.
Claim 5
Dependent Claim
44 words
A hammer head as claimed in claim 1, wherein said hammer face sections and said adapter face sections are sectors of a circle, said sectors all slanting in the same direction as viewed when traveling around the circular periphery of said front surface piece.
Claim 6
Dependent Claim
18 words
A hammer head as claimed in claim 1, wherein the stricking face of the adapter is a plane.
Claim 7
Dependent Claim
32 words
A hammer head as claimed in claim 1 wherein said hammer and adapter face sections are a plurality of projecting stripes intersectiong the longitudinal axis at an acute angle and extending outwards.
Claim 8
Dependent Claim
16 words
A hammer head as claimed in claim 6, wherein said stripes are arc shaped or curved.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |