US3788404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic impact tool
Assignee: NARADI
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Filing: 1972-01-28
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Granted: 1974-01-29
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Expires: 1992-01-28
Abstract
Abstract A penumatic impact tool, in which oscillations below the frequency of 1000 cycles per second, which are detrimental to the health of the operator, are substantially reduced by the arrangement of the working cylinder as a dilation cylinder, composed of two axially aligned parts, cushioned with respect to the body of the tool.
Inventors
- 👤 V Koudelka
- 👤 M Lada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:13
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
Pneumatic impact tool comprising a substantially cylindrical body, a working cylinder located in said body, said working cylinder comprising an upper reaction part and a separate lower guiding part, both said parts being axially aligned in said body and being adapted to slide toward and away from each other, said upper and lower parts forming together a dilatation cylinder having a piston operating therein, said upper part and said lower part being individually cushioned with respect to said body by at least one prestressed elastic element respectively, an extension fixed to the lower end of the body, a working tool slidingly arranged in the lower part of the working cylinder and in said extension, said tool receiving the impact from the piston and from the lower part of said working cylinder, and means for alternately supplying and discharging a gaseous pressure medium into and from the spaces of the working cylinder above and below said piston.
Claim 2
Dependent Claim
156 words
Pneumatic impact tool comprising a substantially cylindrical body, a working cylinder located in said body, said working cylinder comprising an upper reaction part and a separate lower guiding part, both said parts being axially aligned in said body and being adapted to slide toward and away from each other, said upper and lower parts forming together a dilatation cylinder having a piston operating therein, said upper part and said lower part being individually cushioned with respect to said body by at least one prestressed elastic element respectively, an extension fixed to the lower end of the body, a working tool slidingly arranged in the lower part of the working cylinder and in said extension, said tool receiving the impact from the piston and from the lower part of said working cylinder, and means for alternately supplying and discharging a gaseous pressure medium into and from the spaces of the working cylinder above and below said piston.
Claim 3
Dependent Claim
39 words
The tool according to claim 1 including a casing having a handle, said casing being slidingly secured on the upper end of said body and axially cushioned with respect to said body by at least one prestressed elastic element.
Claim 4
Dependent Claim
34 words
Pneumatic impact tool as set forth in claim 1 wherein a damping space is located between the upper front wall of the reaction part and the part of the casing facing the front wall.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |