초록 ▼

The disclosure provides for a number of improvements in a brake-clutch mechanism wherein a drum is carried on the drive member for driving engagement by clutch shoes carried by the driven member. The clutch shoes are normally biased into driving engagement with the drum and a brake band is utilized

The disclosure provides for a number of improvements in a brake-clutch mechanism wherein a drum is carried on the drive member for driving engagement by clutch shoes carried by the driven member. The clutch shoes are normally biased into driving engagement with the drum and a brake band is utilized to move the clutch shoes out of engagement with the drum and to stop rotation of the driven member without interrupting the rotation of the drive member. The improvements relate to a higher torque capability for the mechanism, the exclusion of foreign matter from the mechanism, the mounting for the brake band, the use of the brake band to aid in keeping the braking surfaces clean, and provision for cut-off of the power source in the event the brake band should fail. The disclosure further contemplates a novel arrangement for driving and controlling the chain sprocket of a chain saw.

대표청구항 ▼

In a brake-clutch mechanism between rotatable drive and driven members, a housing having an open face, a seal plate extending over the open face of said housing and having a circular opening, a drum carried on said drive member and having at least the circumferential flange thereof disposed in the h

In a brake-clutch mechanism between rotatable drive and driven members, a housing having an open face, a seal plate extending over the open face of said housing and having a circular opening, a drum carried on said drive member and having at least the circumferential flange thereof disposed in the housing, clutch shoes carried on said driven member and being movable relative thereto into and out of clutching engagement with the drum, means for effecting movement of said shoes into engagement with the drum to drivingly clutch the drive and driven members together, a brake band for effecting movement of said shoes out of engagement with the drum and to stop rotation of the driven member without interrupting the rotation of the drive member, said clutch shoes, brake band and means for effecting movement of said shoes into engagement with the drum all being disposed in said housing, and a slinger plate carried by one of said rotatable members, said slinger plate extending radially beyond the opening in said seal plate and in close proximity with the edge of the opening to provide a rotary closure for the housing to substantially preclude entry of deleterious matter into said housing.