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Apparatus for guiding, holding or moving longitudinal elements
| Details |
Inventors: Bishop, Bernard F.;
Assignee:
Primary Examiner: Petrakes; John
Assistant Examiner: Han; Phillip
Attorney, Agent or Firm: Black; Robert J.
Apparatus for advancing, belaying, or retracting a longitudinal element, such as a cable, by means of engagement with an endless belt driven by a reversible motor in a predetermined endless path geometrically formed to guide and constrain the belt in the path by means of camming action along and around a support element. The cable is free to enter the apparatus engaging the belt at either end of the support element, to be advanced, belayed, or retracted by the belt along this predetermined path. |
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DETAILED DESCRIPTION The present invention consists of apparatus useful for guiding, advancing, belaying or retracting an element of indeterminent length, such as webbing, rope, cable, chain, wire, etc.
, and more particularly concerned with the advancing, belaying or retracting of the element by means of contact or frictional engagement with an endless belt, chain or other conveyance driven in a continuous geometrically precise path around a support member.
Force is imparted to the element to be advanced, belayed, retracted or pushed by contact friction, essentially in accordance with the capstan principle.
The endless belt, chain or other conveyance is guided in and constrained to a predetermined, continuous geometric camming path by a surface, track or groove included in the surface of a stationary or rotatable support member.
The path is formed to guide and constrain the endless belt and with it the element being advanced, by a camming action of the belt, causing it to seek the center of the path as it travels, rather than by physically forcing the endless belt to follow the path by action of restraining sidewalls, such as may be found with a groove or rut.
The formed path would be generally helical in a sense that it is both axial and circumferential, but its camming action on the endless belt is its essential feature.
Included in the camming track or groove may be rollers or pulleys whose axes are arranged essentially normal to the continuous path or track around the support member.
The element being advanced, belayed, retracted or pushed is in turn guided and constrained by contact with the endless belt, chain or other conveyance.
The endless belt, chain or other conveyance is driven along the continuous camming track or path by a pulley, gear, capstan or other means.
Compared to other devices for applying tension to elements of indeterminent length, such as wire, rope or cable, the present invention is of minimal size and weight with relation to the tension applied and only requires minimal bending and causes only minimal abrasion or deformation to the element being advanced, belayed or retracted
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