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Floating Belt Tension Adjustor

IP.com Disclosure Number: IPCOM000077146D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gratowski, F: AUTHOR

Abstract

Belt 1 (Fig. 1) transmits power from drive shaft 2 via drive pulley 3 and driven pulley 4 to shaft 5. Idler pulleys 6,7 are interposed between and engage the driving and driven runs a,b, respectively, of belt 1. Pulleys 6,7 are rotatably mounted on bearings 8 (Fig. 2) carried by bolts 9 secured by nuts 10 to a common bracket 11. Pulley 6 is adjustably positioned along slot 12 in bracket 11 to provide a pretension of desired magnitude (e.g., 10#) in each run of belt 1 when the belt is not being driven, and bracket and idlers are biased counterclockwise about shaft 5 to one limit position by a suitably anchored dampening spring 13 (see Fig. 1) acting on pulley 7. Pointer 14 on bracket 11 will then indicate "0" horsepower on a calibrated scale in fixed back plate 15.

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Floating Belt Tension Adjustor

Belt 1 (Fig. 1) transmits power from drive shaft 2 via drive pulley 3 and driven pulley 4 to shaft 5. Idler pulleys 6,7 are interposed between and engage the driving and driven runs a,b, respectively, of belt 1. Pulleys 6,7 are rotatably mounted on bearings 8 (Fig. 2) carried by bolts 9 secured by nuts 10 to a common bracket 11. Pulley 6 is adjustably positioned along slot 12 in bracket 11 to provide a pretension of desired magnitude (e.g., 10#) in each run of belt 1 when the belt is not being driven, and bracket and idlers are biased counterclockwise about shaft 5 to one limit position by a suitably anchored dampening spring 13 (see Fig. 1) acting on pulley 7. Pointer 14 on bracket 11 will then indicate "0" horsepower on a calibrated scale in fixed back plate 15.

As power is applied to belt 1 from shaft 2, tension increases in run b and decreases in run a, forcing bracket 11 and hence pulleys 6,7 clockwise about shaft 5 (e.g., see Fig. 1). The scale on plate 15 is calibrated so that pointer 14 will indicate the horsepower being transmitted to driven shaft 5. If shaft 5 becomes overloaded, bracket 11 will be rotated clockwise far enough to cause pointer 14 (or pulley 6) to strike and open a normally closed microswitch, not shown; this switch is adjustably prepositioned to open at a preselected degree of load to cause suitable circuitry, not shown, to shut off power to drive shaft 2 until a manual reset of the circuitry.

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