US3237406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic hammer
Assignee: Raymond International Inc
•
Filing: 1962-12-10
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Granted: 1966-03-01
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Expires: 1982-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ernst W Spannhake
- 👤 George J Gendron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:28
CPC Classifications
E; E02; E02D; E02D7/00; E02D7/02; E02D7/06; E02D7/10; B; B21; B21J; B21J7/00; B21J7/20; B21J7/22; B21J7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A HYDRAULIC HAMMER COMPRISING: A HYDRAULIC CYLINDER, A PISTON RECIPROCABLE THEREIN, A ROD EXTENDING FROM SAID PISTON HAVING A DRIVING RAM SECURED THERETO, A CAM LINKED TO AND RECIPROCATED BY SAID RAM IN RESPONSE TO RECIPROCATION OF SAID PISTON, A ROTARY CAM FOLLOWER OSCILLATED BY RECIPROCATION OF SAID CAM, A REVERSING SLIDE VALVE HAVING A SLIDE ARM ECCENTRICALLY LINKED TO SAID CAM FOLLOWER FOR RECIPROCATION THEREBY BETWEEN A PAIR OF VALVE ACTUATING POSITIONS, HYDRAULIC PRESSURE AND DRAIN CONDUITS CONNECTED TO SAID VALVE, A CONDUIT INTERCONNECTING THE TOP OF SAID CYLINDER AND SAID VALVE, SAID VALVE HAVING MEANS IN A FIRST OF SAID PAIR OF VALVE ACTUATING POSITIONS FOR CONNECTING SAID PRESSURE CONDUIT TO SAID INTERCONNECTING CONDUIT AND HAVING MEANS IN THE SECOND POSITION OF SAID PAIR FOR CONNECTING SAID DRAIN CONDUIT TO SAID INTERCONNECTING CONDUIT, A GAS PRESSURIZED ACCUMULATOR MOUNTED ADJACENT SAID CYLINDER AND CONDUIT-CONNECTED TO SAID PRESSURE CONDUIT AND TO THE BASE OF SAID CYLINDER, THE VOLUME OF SAID ACCUMULATOR BEING ABOUT 5 TO 20 TIMES THE VOLUME OF SAID CYLINDER.
Claim 2
Dependent Claim
172 words
A HYDRAULIC HAMMER COMPRISING: A HYDRAULIC CYLINDER, A PISTON RECIPROCABLE THEREIN, A ROD EXTENDING FROM SAID PISTON HAVING A DRIVING RAM SECURED THERETO, A CAM LINKED TO AND RECIPROCATED BY SAID RAM IN RESPONSE TO RECIPROCATION OF SAID PISTON, A ROTARY CAM FOLLOWER OSCILLATED BY RECIPROCATION OF SAID CAM, A REVERSING SLIDE VALVE HAVING A SLIDE ARM ECCENTRICALLY LINKED TO SAID CAM FOLLOWER FOR RECIPROCATION THEREBY BETWEEN A PAIR OF VALVE ACTUATING POSITIONS, HYDRAULIC PRESSURE AND DRAIN CONDUITS CONNECTED TO SAID VALVE, A CONDUIT INTERCONNECTING THE TOP OF SAID CYLINDER AND SAID VALVE, SAID VALVE HAVING MEANS IN A FIRST OF SAID PAIR OF VALVE ACTUATING POSITIONS FOR CONNECTING SAID PRESSURE CONDUIT TO SAID INTERCONNECTING CONDUIT AND HAVING MEANS IN THE SECOND POSITION OF SAID PAIR FOR CONNECTING SAID DRAIN CONDUIT TO SAID INTERCONNECTING CONDUIT, A GAS PRESSURIZED ACCUMULATOR MOUNTED ADJACENT SAID CYLINDER AND CONDUIT-CONNECTED TO SAID PRESSURE CONDUIT AND TO THE BASE OF SAID CYLINDER, THE VOLUME OF SAID ACCUMULATOR BEING ABOUT 5 TO 20 TIMES THE VOLUME OF SAID CYLINDER.
References Cited (Backward Citations)
US2723532A
Cited
US1085061A
Cited
US1716881A
Cited
US2566381A
Cited
US2549979A
Cited
US2603065A
Cited
US2634679A
Cited
US2972863A
Cited
US2798363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |