Patent US4015671A successfully refreshed from Google Patents.
US4015671A
Expired / Lapsed
US
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Electric hammer
Assignee: Individual
•
Filing: 1973-04-17
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Granted: 1977-04-05
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Expires: 1993-04-17
Abstract
Abstract An electric hammer comprising a housing accommodating a stator, a hammer piston reciprocably mounted in the stator, and a shock absorber including a resilient member and an intermediate member disposed between the hammer piston and the resilient member, the mass of the intermediate member being greater than that of the hammer piston.
Inventors
- 👤 Vladimir Mikhailovich Borisov
- 👤 Boris Grigorievich Goldshtein
- 👤 Albert Adlofovich Goppen
- 👤 Vladimir Alexeevich Eletsky
- 👤 Viktor Lvovich Sherman
- 👤 Kherbert Zhanovich Bush
- 👤 Nikolai Pavlovich Ryashentsev
- 👤 Evgeny Mikhailovich Timoshenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:53
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/24; B25D11/00; B25D11/06; B25D11/064; B25D2217/00; B25D2217/0073; B25D2217/0076; B25D2217/0092
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
An electric hammer comprising: a housing; a stator accommodated in said housing; a hammer piston reciprocably mounted in said stator; a shock absorber accommodated in said housing and including a resilient member and an intermediate member disposed between said hammer piston and said resilient member; the mass of said intermediate member of the shock absorber being greater than the mass of said hammer piston, the mass of said intermediate member of the shock absorber and the force of said resilient member being determined by the ratio between the natural frequency of oscillations of the intermediate member and the stroke frequency of the hammer member, said ratio being substantially equal to (0.25-0.6).
Claim 2
Dependent Claim
111 words
An electric hammer comprising: a housing; a stator accommodated in said housing; a hammer piston reciprocably mounted in said stator; a shock absorber accommodated in said housing and including a resilient member and an intermediate member disposed between said hammer piston and said resilient member; the mass of said intermediate member of the shock absorber being greater than the mass of said hammer piston, the mass of said intermediate member of the shock absorber and the force of said resilient member being determined by the ratio between the natural frequency of oscillations of the intermediate member and the stroke frequency of the hammer member, said ratio being substantially equal to (0.25-0.6).
Claim 3
Dependent Claim
116 words
An electric hammer comprising: a housing; a stator accommodated in said housing; a hammer piston reciprocably mounted in said stator; a shock absorber accommodated in said housing and including a resilient member and an intermediate member disposed between said hammer piston and said resilient member; the mass of said intermediate member of the shock absorber being greater than the mass of said hammer piston by 1.2 to 3.2 times, the mass of said intermediate member of the shock absorber and the force of said resilient member being determined by the ratio between the natural frequency of oscillations of the intermediate member and the stroke frequency of the hammer piston, said ratio being substantially equal to (0.25-0.6).
Claim 4
Dependent Claim
116 words
An electric hammer comprising: a housing; a stator accommodated in said housing; a hammer piston reciprocably mounted in said stator; a shock absorber accommodated in said housing and including a resilient member and an intermediate member disposed between said hammer piston and said resilient member; the mass of said intermediate member of the shock absorber being greater than the mass of said hammer piston by 1.2 to 3.2 times, the mass of said intermediate member of the shock absorber and the force of said resilient member being determined by the ratio between the natural frequency of oscillations of the intermediate member and the stroke frequency of the hammer piston, said ratio being substantially equal to (0.25-0.6).
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |