Rammer

Details Rammer Rammer

1975-12-05

1978-01-10

Purser, Ernest R.

Tool driving or impacting

Impacting devices

Hammer head constitutes piston of drive motor

123 46H, 123 32F, E02D 712

Patent

active

040674029

ABSTRACT:
In a rammer a piston housed in a combustion cylinder strikes with its impact surface the adapted impact surface of a striker. When the impact surfaces are spherical or flattened the piston may strike against the cylinder wall, as a result of which the cylinder surfaces and the piston surfaces wear off strongly. In accordance with the invention the impact surfaces have a tangential cone having an obtuse apex so that on the one hand a sufficient centering of the piston with respect to the striker is obtained and on the other hand the risk of cracking in piston and striker is prevented.

REFERENCES:
patent: 2709992 (1955-06-01), Graves
patent: 2804856 (1957-09-01), Spurlin
patent: 3303892 (1967-02-01), Nishimura et al.
patent: 3679005 (1972-07-01), Inaba et al.
patent: 3747693 (1973-07-01), Kummel

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