초록 ▼

A pneumatically driven power tool includes a handle with air inlet and outlet passageways therein, and a transverse mounting housing. The mounting housing has a transverse circumferential portion with a rear abutment wall, a rear annular shoulder portion, an intermediate cylindrical wall segment, an

A pneumatically driven power tool includes a handle with air inlet and outlet passageways therein, and a transverse mounting housing. The mounting housing has a transverse circumferential portion with a rear abutment wall, a rear annular shoulder portion, an intermediate cylindrical wall segment, and a front annular shoulder portion. A rear bearing member and a rear mounting plate are inserted into the circumferential portion to abut respectively against the rear abutment wall and the rear annular shoulder portion, and are secured by a lockpin. A front mounting plate and a front bearing member are inserted into the circumferential portion to abut against the front annular shoulder portion and the front mounting plate, and are secured by another lockpin. A motor cylinder mates with the circumferential portion. A driven shaft is disposed in and is rotatable relative to the cylinder, and is journalled on the front and rear bearing members. The motor cylinder further has inlet and outlet ports respectively in fluid communication with the inlet and outlet passageways. Compressed air introduced from the inlet passageway into the inlet ports will drive the driven shaft, and will then be discharged from the outlet port via the outlet passageway.

대표청구항 ▼

[ I claim:] [1.] A pneumatically driven power tool comprising:a handle having upper and lower ends opposite to each other in a longitudinal direction, and defining air inlet and outlet passageways respectively extending in said longitudinal direction, said air inlet passageway being adapted to be co

[ I claim:] [1.] A pneumatically driven power tool comprising:a handle having upper and lower ends opposite to each other in a longitudinal direction, and defining air inlet and outlet passageways respectively extending in said longitudinal direction, said air inlet passageway being adapted to be connected to a source of compressed air;a mounting housing disposed on said upper end, and elongated in a first transverse direction relative to said longitudinal direction, said mounting housing having a rear end portion disposed to extend in a second direction transverse to said first transverse direction, and with a first periphery, and a circumferential portion defining an axis parallel to said first transverse direction, and integrally formed with, and extending from said first periphery in said first transverse direction to form an annular coupling end opposite to said rear end portion in said first transverse direction, said circumferential portion having an outer circumferential wall fixedly secured to said upper end, and an inner circumferential wall opposite to said outer circumferential wall in a direction radial to said axis,said inner circumferential wall including:a rear annular wall segment of a first dimension disposed around said axis and adjacent to, and forming with said rear end portion a rear abutment wall which is normal to said axis;a rear cylindrical wall segment extending from said rear annular wall segment forwardly and in said first transverse direction, and of a second dimension larger than said first dimension so as to form a rear annular shoulder portion between said rear cylindrical Wall segment and said rear annular wall segment and normal to said axis;an intermediate cylindrical wall segment extending from said rear cylindrical wall segment in said first transverse direction and towards said annular coupling end, and of said second dimension;a first front cylindrical wall segment extending from said intermediate cylindrical wall segment in said first transverse direction and towards said annular coupling end, and of a third dimension larger than said second dimension so as to form a front annular shoulder portion between said first front cylindrical wall segment and said intermediate cylindrical wall segment and normal to said axis; anda second front cylindrical wall segment extending from said first front cylindrical wall segment in said first transverse direction and towards said annular coupling end, and of said third dimension;a rear bearing member disposed to be insertable along said axis into said rear annular wall segment to abut against said rear abutment wall, and having a rear cylindrical bearing surface surrounding said axis;a rear mounting plate disposed to be insertable along said axis into said rear cylindrical wall segment, and including a first major wall which is disposed to abut against said rear annular shoulder portion and which has a through hole aligned with said rear cylindrical bearing surface, and a first circular circumferential wall formed at a second periphery of said major wall and of a dimension to mate with said rear cylindrical wall segment;a motor cylinder disposed to be insertable along said axis into said intermediate cylindrical wall segment, and including a rearward wall disposed to be normal to said axis so as to be brought to abut against said first major wall, a forward wall opposed to said rearward wall in said first transverse direction, and a middle circular circumferential wall interposed therebetween and of such a dimension so as to mate with said intermediate cylindrical wall segment;a driven shaft disposed in and rotatable relative to said motor cylinder, and having a rear portion extending rearward and outwardly of said motor cylinder so as to be journalled on said rear cylindrical bearing surface, a front portion extending forward and outwardly of said motor cylinder, and a drive output end extending forward from said front portion;a front mounting plate disposed to be insertable along said axis into said first front cylindrical wall segment, and including a second major wall which is disposed to abut against said front annular shoulder portion and which has a through hole for passage of said front portion of said driven shaft, and a second circular circumferential wall formed at a third periphery of said second major wall and of a dimension to mate with said first front cylindrical wall;a front bearing member disposed to be insertable along said axis into said second front cylindrical wall segment, and including a rearward abutment wall disposed to abut against said front mounting plate in said first transverse direction, and a forward abutment wall opposite to said rearward abutment wall in said first transverse direction, said rearward abutment wall defining therein a front cylindrical bearing surface which surrounds said axis to journal said front portion of said driven shaft thereon, and which extends to communicate with said forward abutment wall so as to permit said drive output end to protrude forward and outwardly thereof; andan annular retaining member having an annular engaging portion disposed to be brought into engagement with said annular coupling end along said axis, and an annular retaining portion disposed to be such that when said annular retaining member is brought into engagement with said annular coupling end, said annular retaining portion will abut against said forward abutment wall of said front bearing member so as to clamp said front bearing member in cooperation with said second major wall of said front mounting plate, wherein said motor cylinder further has inlet and outlet ports respectively disposed therein and in fluid communication with said inlet and outlet passageways respectively such that the compressed air introduced from said inlet passageway into said inlet ports will drive said driven shaft, and will then be discharged from said outlet port via said outlet passageway.