Power hammer

Details Power hammer Power hammer

1983-03-16

1985-06-18

Kazenske, E. R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173128, 173134, B25D 900

Patent

active

045236470

ABSTRACT:
A power hammer for driving piles and the like which includes a housing having a ram carried therein for reciprocating vertical movement to strike, during its downward movement, an anvil slidably carried within the lower portion of the housing. The portion of the housing in which the anvil is carried is formed with an annular recess, and the anvil includes an annular flange projecting into the recess to form an enclosed chamber beneath such flange. Air pressure generated by the ascendency of the ram is transmitted to the enclosed chamber to impose an upwardly directed force on the anvil whereby the weight of the anvil is utilized to oppose the upwardly directed force imposed on the power hammer during the ascending movement of the ram. The anvil flange is positioned in the recess to close the fluid inlet thereto when there is any significant downward movement of the anvil relative to the housing, so that the air in the enclosed chamber is trapped to provide an air cushion which reduces any impact load that may be transmitted from the anvil to the housing.

REFERENCES:
patent: 3266581 (1966-08-01), Cooley et al.
patent: 3625295 (1971-12-01), Gunning
patent: 4089380 (1978-05-01), Hibbard
patent: 4257488 (1981-03-01), Schnell
patent: 4340120 (1982-07-01), Hauk et al.
patent: 4363365 (1982-12-01), Nikolaev et al.
patent: 4427078 (1984-01-01), Wolters et al.

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