Tool driving or impacting – Drive controlled by relative axial movement of tool – Reciprocating drive member connected to pulsing fluid column
Patent
1988-04-28
1989-05-09
Schran, Donald R.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Reciprocating drive member connected to pulsing fluid column
173116, 60542, B23Q 5033
Patent
active
048280461
ABSTRACT:
A vacuum-compression type percussion power tool comprising a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric motor, or any other suitable drive, a working tool (24) installed in the front part of the power tool, and a floating striker (34) which slides inside the cylinder (14) in a space between a tail portion (26) of the working tool (24) and the lower end of the piston. In addition to a main working chamber (38), which is formed between the piston and a striker, it is provided with a sealed auxiliary chamber (54, 56), which is connected with the main chamber through a set of compensation holes (38) and a set of idle-stroke holes, so that when the striker performs a working stroke toward the working tool, in addition to the force applied to the striker from air compressed in the working chamber, it is additionally assisted by the force of a vacuum developed in the auxiliary chamber. As a result, it develops higher impact energy than a conventional tool of the same weight and overall length. The power tool also has a reduced level of vibrations transmitted to the housing because of a reduced peak pressure developed in the main working chamber.
REFERENCES:
patent: 3161242 (1964-12-01), Etzkorn et al.
patent: 3559751 (1971-02-01), Yamada
patent: 4690225 (1987-09-01), Tupitsyn et al.
Schran Donald R.
Wolfe James L.
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