US3664435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic hammer with automatic stopping action
Assignee: Worthington Corp
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Filing: 1970-11-09
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Granted: 1972-05-23
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Expires: 1990-11-09
Abstract
Abstract An improved hydraulic hammer assembly including an automatically operable system for connecting the inlet to the outlet and bypassing the control system of the hammer when the hammer moves past a predetermined point as when the work performing element of the assembly is not in contact with the work. In the exemplary embodiment, a bypass conduit extends from the inlet to the outlet and is normally closed by a valve. When the hammer does not move past the position where it would normally encounter the tool, the application of fluid under pressure to first and third surfaces of the valve maintains the valve closed notwithstanding the application of pressure to a second surface thereon in opposed hydraulic relation to the first and third surfaces. However, when the hammer moves past the position mentioned above, the third surface on the valve is vented to the outlet and the application of fluid under pressure to the second surface causes the valve to open to establish a bypass flow path for the hydraulic fluid which avoids entirely the control system used to control reciprocation of the hammer.
Inventors
- 👤 Ernest F Klessig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B25D9/12; Y; Y10; Y10S; Y10S173/00; Y10S173/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A hydraulic hammer comprising: a casing having a bore; a hammer received within said bore for reciprocating movement therein; a tool adjacent one end of the bore and normally positioned to be struck by said hammer, said tool being movably mounted and movable to a position wherein it cannot be struck by said hammer; a hydraulic fluid inlet in said casing; a hydraulic fluid outlet in said casing; means, including a hydraulically operated control valve for intermittently directing hydraulic fluid from said inlet to the hammer to drive the same in one direction within said bore; means for driving the hammer within said bore in a direction opposite said one direction; and means associated with said inlet and said outlet and responsive to movement of the tool to said position thereof for directing hydraulic fluid from said inlet to said outlet in a flow path that bypasses said control valve.
Claim 2
Dependent Claim
150 words
A hydraulic hammer comprising: a casing having a bore; a hammer received within said bore for reciprocating movement therein; a tool adjacent one end of the bore and normally positioned to be struck by said hammer, said tool being movably mounted and movable to a position wherein it cannot be struck by said hammer; a hydraulic fluid inlet in said casing; a hydraulic fluid outlet in said casing; means, including a hydraulically operated control valve for intermittently directing hydraulic fluid from said inlet to the hammer to drive the same in one direction within said bore; means for driving the hammer within said bore in a direction opposite said one direction; and means associated with said inlet and said outlet and responsive to movement of the tool to said position thereof for directing hydraulic fluid from said inlet to said outlet in a flow path that bypasses said control valve.
Claim 3
Dependent Claim
33 words
A hydraulic hammer according to claim 1 wherein said directing means includeS a bypass conduit within said casing extending from said inlet to said outlet and a valve normally closing said bypass conduit.
Claim 4
Dependent Claim
141 words
A hydraulic hammer according to claim 1 wherein said directing means comprises a bypass conduit within said casing extending from said inlet to said outlet, a valve member positioned to close said bypass conduit, said valve having a pair of opposed pressure sensing surfaces with one of said surfaces having a larger area than the other of said surfaces, said valve further including a third pressure sensitive surface hydraulically parallel to said other surface, said pair of surfaces being arranged with respect to each other and to said inlet and said bypass conduit so that said valve will be moved to open said bypass conduit whenever pressure is not applied to said third surface, and means for applying fluid under pressure to said third surface whenever said anvil is not in said position wherein it cannot be struck by said hammer.
Claim 5
Dependent Claim
62 words
A hydraulic hammer according to claim 3 wherein said means for applying pressure to said third surface includes conduit means on said hammer normally establishing fluid communication between said inlet and said third surface and cooperating means within said casing for blocking said conduit means when said hammer moves within said bore past a portion wherein it would normally strike said tool.
Claim 6
Dependent Claim
131 words
A hydraulic hammer comprising: a casing having a bore; a tool movably mounted adjacent one end of a bore and normally positioned to be struck by a hammer; a hammer received within said bore for reciprocating movement to a position wherein it would normally strike said tool; a hydraulic fluid inlet in said casing; a hydraulic fluid outlet in said casing; means, including a hydraulically operated control valve for intermittently directing hydrualic fluid from said inlet to said hammer to drive the same towards said tool; and means associated with said inlet and said outlet and responsive to movement of said hammer past said position wherein it would normally strike said tool for directing hydraulic fluid from said inlet to said outlet in a flow path that bypasses said control valve.
Claim 7
Dependent Claim
131 words
A hydraulic hammer comprising: a casing having a bore; a tool movably mounted adjacent one end of a bore and normally positioned to be struck by a hammer; a hammer received within said bore for reciprocating movement to a position wherein it would normally strike said tool; a hydraulic fluid inlet in said casing; a hydraulic fluid outlet in said casing; means, including a hydraulically operated control valve for intermittently directing hydrualic fluid from said inlet to said hammer to drive the same towards said tool; and means associated with said inlet and said outlet and responsive to movement of said hammer past said position wherein it would normally strike said tool for directing hydraulic fluid from said inlet to said outlet in a flow path that bypasses said control valve.
Claim 8
Dependent Claim
90 words
A hydraulic hammer according to claim 5 wherein said directing means comprises a bypass conduit extending between said inlet and said outlet, a hydraulic operated bypass valve normally closing said bypass conduit and means for normally directing fluid under pressure from said inlet to said bypass valve to bias the same to a closed position, and means on said hammer for blocking the application of fluid under pressure from said inlet to said bypass valve when said hammer moves beyond the position at which it would normally strike said tool.
Claim 9
Dependent Claim
86 words
A hydraulic hammer according to claim 6 further including means on said hammer for directing fluid from said bypass valve to said outlet when said hammer moves beyond said position at which it would normally strike said tool; said bypass valve further including pressure responsive surface means in fluid communication with said inlet and responsive to the fluid under pressure to cause movement of said bypass valve to an open position when said hammer has moved beyond said position wherein it would normally strike said tool.
Claim 10
Dependent Claim
120 words
A hydraulic impact device having a casing having a bore, a hammer element reciprocable in said bore in a cycle between normal limit positions by controlled application of pressure fluid to opposed areas of the hammer, said casing having a pressure fluid inlet and a fluid outlet, a control valve for controlling the intermittent application of fluid to one of said areas of the hammer, a bypass passage in said casing connecting said inlet and outlet and bypassing said control valve, a bypass valve closing said bypass passage, and means, including a valve section on said hammer, responsive to movement of the hammer beyond a normal limit position to open said bypass valve and stop cycling of the hammer element.
Claim 11
Dependent Claim
120 words
A hydraulic impact device having a casing having a bore, a hammer element reciprocable in said bore in a cycle between normal limit positions by controlled application of pressure fluid to opposed areas of the hammer, said casing having a pressure fluid inlet and a fluid outlet, a control valve for controlling the intermittent application of fluid to one of said areas of the hammer, a bypass passage in said casing connecting said inlet and outlet and bypassing said control valve, a bypass valve closing said bypass passage, and means, including a valve section on said hammer, responsive to movement of the hammer beyond a normal limit position to open said bypass valve and stop cycling of the hammer element.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |