Power driven hammer drill

Details Power driven hammer drill Power driven hammer drill

1993-03-26

1994-06-14

Rada, Rinaldi

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173109, 173201, B25D 1110

Patent

active

053201779

ABSTRACT:
The invention provides an improved intermediate housing incorporated in a power driven hammer drill, which is light in weight, easily and safely handled, and uncostly manufactured. The intermediate housing of the invention includes a bearing member and a cylindrical piston housing member which are integrally composed of a synthetic resin having high tenacity and excellent heat resistance and wear resistance. The intermediate housing further includes a plurality of ribs radially extending from the piston housing member to give a sufficient strength durable to a stress applied onto the piston housing member. In the intermediate housing thus constructed, the bearing member has at least one opening for feeding an air flow generated by a fan while the piston housing member includes at least one air conduit for circulating the air flow. This structure efficiently prevents overheat and thermal deformation of the piston housing member and the bearing member in continuous operation of the hammer drill.

REFERENCES:
patent: 3876014 (1975-04-01), Moores, Jr.
patent: 4657088 (1987-04-01), Grossmann et al.
patent: 4895212 (1990-01-01), Wache
patent: 4998588 (1991-03-01), Manschitz
patent: 5036925 (1991-08-01), Wache
patent: 5052497 (1991-10-01), Houben et al.

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