초록 ▼

A hydraulically operated impact tool is provided for performing land-based or undersea tasks including hammering, chipping, scraping, punching, and cutting. The tool\s features include a spring (preferably hydroelastic) for storing impact-stroke energy, a configuration of valves which eliminates flo

A hydraulically operated impact tool is provided for performing land-based or undersea tasks including hammering, chipping, scraping, punching, and cutting. The tool\s features include a spring (preferably hydroelastic) for storing impact-stroke energy, a configuration of valves which eliminates flow in the supply and return lines during the impact stroke, and a control approach which provides operator selection of either single-blow or continuous-cycling operation.

대표청구항 ▼

A hydraulically-operated linear impact device comprising a body member having a longitudinal bore extending therethrough and a plunger supported in said bore, main valve means, trigger valve means, hydraulic fluid lines connecting said bore and valves with a source of hydraulic fluid, spring means a

A hydraulically-operated linear impact device comprising a body member having a longitudinal bore extending therethrough and a plunger supported in said bore, main valve means, trigger valve means, hydraulic fluid lines connecting said bore and valves with a source of hydraulic fluid, spring means acting near the upper end of said plunger and means for detachably mounting a tool member at the lower end of said body member wherein a. said trigger valve means is mounted in said body member for movement between an actuating position and a rest position; b. said plunger is supported for reciprocating movement in said bore between a first position in which said plunger compresses the spring means at the upper end of the body member and a second position at the lower end of the body member in which said plunger may impact a tool member, and wherein said plunger has enlarged diameter area (DIA. 3) intermediate its upper and lower ends forming a valved annular work area (11) for hydraulic fluid pressure acting to move said plunger upward against said spring means; c. said main valve means having connections to said bore and to a high-pressure supply line and a lower-pressure return line for hydraulic fluid and being positionable, when the trigger is in actuating position, in response to a condition of said plunger such that when the plunger is in its downward second position said main valve means connects fluid under high pressure from said supply line to said valved annular area of the plunger to cause the plunger to be moved upward against said spring means, and when the plunger has moved to its upward, first position against said spring means, said main valve means connects said valved annular area to lower-pressure fluid such that said spring means is unopposed by high pressure and can then move said plunger downward on the impact stroke; d. said spring means comprises a mechanical, pneumatic or hydraulic spring which acts near the upper end of said plunger to bias the plunger downward, and wherein e. said hydraulic fluid lines are operable when the trigger is in the actuating position and said plunger is in its downward second position to provide a first fluid circuit from said high-pressure supply line to said main valve means for actuating the main valve means to connect fluid under high-pressure from said supply line to said valved annular area causing said plunger to be moved upward against said spring means and to compress said spring means, and said hydraulic fluid lines are operable when said plunger is in its upward first position to provide a second fluid circuit from said lower-pressure return line to said main valve means for actuating the main valve means to connect said valved annular surface to lower-pressure fluid causing the plunger to be moved downward to impact the tool member due to said compressed spring means acting on said plunger.