Abstract The self-reeving tractive device is usable as a hoist, capstan or winch. The drum rotates within a housing having a helical groove on the inside cooperating with the drum to confine the (wire) rope to the groove. A pinch roller projects through the housing to squeeze or hold the rope against the drum. When the rope end is introduced through an opening at one end of the drum, the roller grips the rope in cooperation with the drum to force the rope to feed into the groove. With each complete wrap on the drum, the roller again grips the rope so it is continually forced along the groove. The rope leaves the drum at the other end of the drum and passes through an opening in the housing. Another roller, spring pressed, acts on the rope to keep tension on the tail to prevent relaxing of the rope with consequent loss of frictional engagement with the drum. For practical purposes, the drum is totally enclosed and the risk of getting ''''caught'''' in the wraps is minimal.
A traction device comprising: a drum having a generally cylindrical surface, means for rotating the drum in either direction, a generally cylindrical housing enclosing the drum and having an internal helical groove positioned close enough to the drum so as to engage and confine therein a rope wound directly on said drum surfaCe whereby the rope must follow the groove and is, therefore, forced axially over said surface, an aperture in one end of the housing in alignment with the corresponding end of the helical groove to permit rope to be entered into the groove and fed around the drum following the groove, an aperture in the other end of the housing in alignment with the other end of the helical groove to permit egress of the rope from the housing.
Claim 2
Dependent Claim
131 words
A traction device comprising: a drum having a generally cylindrical surface, means for rotating the drum in either direction, a generally cylindrical housing enclosing the drum and having an internal helical groove positioned close enough to the drum so as to engage and confine therein a rope wound directly on said drum surfaCe whereby the rope must follow the groove and is, therefore, forced axially over said surface, an aperture in one end of the housing in alignment with the corresponding end of the helical groove to permit rope to be entered into the groove and fed around the drum following the groove, an aperture in the other end of the housing in alignment with the other end of the helical groove to permit egress of the rope from the housing.
Claim 3
Dependent Claim
36 words
A device according to claim 1 including a pinch roller projecting through the housing and fixed in position close enough to the drum so as to grip the rope between the pinch roller and the drum.
Claim 4
Dependent Claim
45 words
A device according to claim 2 in which the pinch roller axis is parallel to the axis of the drum and has an axial length generally corresponding to that of the drum whereby the pinch roller engages the rope along the length of the drum.
Claim 5
Dependent Claim
20 words
A device according to claim 3 including means driving the pinch roller at the same peripheral speed as the drum.
Claim 6
Dependent Claim
41 words
A device according to claim 2 including a roller projecting through the housing in proximity to the point where the rope egresses from the housing to engage the rope adjacent the point of egress and hold it firmly against the drum.
Claim 7
Dependent Claim
20 words
A device according to claim 5 including means driving the pinch roller at the same peripheral speed as the drum.
Claim 8
Dependent Claim
45 words
A device according to claim 6 in which the pinch roller axis is parallel to the axis of the drum and has an axial length generally corresponding to that of the drum whereby the pinch roller engages the rope along the length of the drum.