Tool driving or impacting – Drive controlled by relative axial movement of tool – Reciprocating drive member connected to pulsing fluid column
Patent
1988-05-05
1990-06-12
Watts, Douglas D.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Reciprocating drive member connected to pulsing fluid column
173116, 60542, B23Q 500
Patent
active
049324799
ABSTRACT:
A vacuum-compression type percussion power tool comprises 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 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 a hollow casing (48) which surrounds the cylinder, and a space below striker (34). The auxiliary chamber is connected to a main working chamber (38), which is formed between the piston and the striker, through a set of compensation holes (44) and a set of idle-stroke holes (46). The power tool has a pumping chamber (27) which is formed in the upper part of cylinder (14) between the upper end face of piston (16) and a closed cover (17). The pumping chamber is sealed against penetration of air from the atmosphere and has a pair of check valves, one of which (45) admits air from the atmosphere into this chamber, and another one (47) admits air from the pumping chamber (27) into the auxiliary chamber (54, 56). In a second embodiment, the reciprocating drive mechanism (18) is located in the pumping chamber. Application of the pumping chamber provides an increased pressure of air within the auxiliary and main working chambers, so that the power tool operates with an increased energy of impact and reduced level of vibrations on the housing.
REFERENCES:
patent: 3161242 (1964-12-01), Etzkorm et al.
patent: 3559751 (1971-02-01), Yamada
patent: 4690225 (1987-09-01), Tupitsyn et al.
Watts Douglas D.
Wolfe James L.
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