IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0190341
(1988-05-05)
|
발명자
/ 주소 |
- Pyatov Vladimir (962 S. El Camino Real
- #202 San Mateo CA 94402)
|
인용정보 |
피인용 횟수 :
11 인용 특허 :
1 |
초록
▼
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 too
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.
대표청구항
▼
A vacuum-compressor-type percussion power tool, comprising: housing means having inner and outer walls; cylinder means located in said housing means and fixed therein, said cylinder means having outer and inner walls, a closed upper wall, and a closed bottom wall with inner and outer sides, said clo
A vacuum-compressor-type percussion power tool, comprising: housing means having inner and outer walls; cylinder means located in said housing means and fixed therein, said cylinder means having outer and inner walls, a closed upper wall, and a closed bottom wall with inner and outer sides, said closed bottom wall having a central opening; reciprocating drive means supported by said housing means opposite to said bottom wall; piston means slidingly guided in said cylinder means and driven by said reciprocating drive means, said piston means having an upper end face, a lower end face, and a periphery; a working tool with a tail portion inserted into said cylinder means through said central opening, said working tool having means which limits insertion of said working tool into said cylinder means; floating striker means having upper and lower end faces and located in said cylinder means for sliding therein between said piston means and said tail portion of said working tool inserted into said cylinder means; a main working chamber formed in said cylinder means between said lower end face of sad piston means and said upper end face of said striker means; an auxiliary chamber which consists of a first space and a second space, said first space being formed between said inner walls of said housing means and said outer walls of said cylinder means, said second space being formed between said lower end face of said striker means, said inner walls of said cylinder means, and said upper end face of said bottom wall; a first set of through holes formed in the wall of said cylinder means above said striker means, said first set of holes connecting said main working chamber with said auxiliary chamber; a second set of through holes in said walls of said cylinder means between said first set of holes and said bottom wall, said second set of holes connecting said first space with said second space, said second set of holes having diameters substantially greater than those of said holes of said first set; sealing means for sealing said auxiliary chamber against penetration of air from the atmosphere; and air-pumping means for pumping air under pressure into said auxiliary chamber from the atmosphere, said air-pumping means comprising: a pumping chamber formed between said upper end face of said piston means, said closed upper wall of said cylinder means, and the walls of said cylinder means; first one-way valve means which admits air into said pumping chamber from the atmosphere only; second one-way valve means which admits air into said auxiliary chamber from said pumping chamber only; and sealing means for sealing said pumping chamber against the atmosphere, said auxiliary chamber, and said main working chamber.
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