Patent ID: 6571932
Filing Date: 2003-06-03
Classification: B23Q,B65G,F16C,F16H

Abstract:
A dustproof linear actuator comprising:a housing, having a first axial end and second axial end opposite to said first axial end, with a slit extending axially from said first axial end to said second axial end, said slit including a slide portion formed adjacent an edge face of said slit; a linear guide device disposed in the housing; a carriage mounted in the housing and axially movable along the slit by the linear guide device, the carriage including a workpiece mounting table protruding from the housing through the slit; a linear drive device disposed in the housing for moving the carriage axially, wherein when said linear drive device axially moves the carriage towards one of said first and second axial ends, air disposed between the carriage and said one of the ends within said housing is compressed so as to cause an increase in pressure thereof; a pair of pulleys disposed in an axial end of the housing; a sealing band movably mounted around the pulleys within the housing for closing the slit, the sealing band including first and second ends which are fastened to first and second ends of the carriage, respectively, to form a circulative loop; and an air venting device having openings, near said first axial end and said second axial end, for venting air existing in the housing to an outside of the housing, to thereby ease the increase of pressure and, in turn, prevent dust within the housing from leaking to the outside of the housing.