Tool driving or impacting – Drive controlled by relative axial movement of tool – Reciprocating drive member connected to pulsing fluid column
Patent
1988-04-29
1989-04-25
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
048238864
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 working tool (24) and the lower end of the piston. The power tool has a sealed auxiliary chamber (54, 56) which is formed by means of a hollow casing (48) which surrounds the cylinder, and a space below the striker (34). The auxiliary chamber is connected to a main working chamber (38), which is formed between the piston and a striker, through a set of compensation holes (44) and a set of idle-stroke holes (46). A check valve (51) is installed in the wall of the auxiliary chamber. This check valve, which connects the auxiliary chamber with an atmospheric-pressure space (49) between the housing and the cylinder, allows flow of air in a direction only from the above-mentioned atmospheric-pressure space to the auxiliary chamber. As a result, during several cycles after starting the power tool, an additional quantity of air will be sucked into the auxiliary chamber via the check valve (51), so that after reaching established conditions, the auxiliary chamber and the main chamber will operate with an increased amount of air, and therefore with an increased pressure at the commencement of each cycle. This will increase the energy of impact.
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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