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Pulley

About: Pulley is a research topic. Over the lifetime, 51636 publications have been published within this topic receiving 178220 citations. The topic is also known as: drum & block.


Papers
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Patent
13 Jan 1992
TL;DR: In this article, a pair of elongated resilient supporting assemblies are attached to opposite sides of the training belt and are comprised of bungy cords which can be selectively added or removed with respect to the assemblies to adjust the resilient capabilities thereof.
Abstract: A gymnastic training device has a conventional training belt adapted to support a gymnast at the waist. A pair of elongated resilient supporting assemblies are attached to opposite sides of the training belt and are comprised of bungy cords which can be selectively added or removed with respect to the assemblies to adjust the resilient capabilities thereof. A pulley support means including a pair of laterally positioned pulleys and at least one elevated pulley are supported over the normal position of the training belt by either a self-standing frame or by a frame assembly attached to the ceiling of a building. A first cable has a center portion and opposite ends with the opposite ends being secured to each of the free ends of the elongated resilient supporting assemblies. The first cable has its center portion threaded over the laterally positioned pulleys and the elevated pulley whereby the training belt is centrally supported between and below the laterally positioned pulleys and above a generally horizontal gymnastic surface. A loop is formed in the first cable and extends downwardly below one of the laterally positioned cables. The loop has a pulley thereon which is secured to the upper end of a second cable which has its lower end secured to an anchored crank mechanism whereby the operation of the crank mechanism can adjust the length of the first cable and thereby adjust the effective height of the training belt.

36 citations

Patent
19 Jun 1989
TL;DR: In this article, a belt transmission is used to compensate for the weight of a vertically displaceable spindle in a coordinate-measuring instrument with a helical-coil spring.
Abstract: A coordinate-measuring instrument has a purely mechanical device (14) to compensate for the weight of a vertically displaceable spindle (9). The compensation device consists of a helical-coil spring having a working range which is small as compared with its length in relaxed condition, and a belt transmission interposed between the spring and the spindle (9). The belt transmission is preferably developed in the manner of a block and tackle. A first or drive pulley engages and drives the belt for Z-axis positioning of the spindle, and a second or belt-tension pulley applies weight-compensating tension to the belt.

36 citations

Patent
17 Aug 1977
TL;DR: In this paper, an electrically adjusted and mechanically driven variable speed pulley transmission provides immediate and accurate changes to the seed dispensing rate of a planter, driven by a ground-engaging wheel and adjusted in response to electrically monitored variations between desired and actual seed plant densities.
Abstract: An electrically adjusted and mechanically driven variable speed pulley transmission provides immediate and accurate changes to the seed dispensing rate of a planter. The variable speed pulley transmission is driven by a ground-engaging wheel and adjusted in response to electrically monitored variations between desired and actual seed plant densities. Adjustment to the sheaves of the transmission pulley is effected by an electric motor and tension springs which interconnect the movable pulley sheaves apply pressure to the sides of the pulley belt to assure torque transmission at low RPM's.

36 citations

Patent
27 Aug 1988
TL;DR: In this article, a belt driven continuously variable transmission has a pressure regulating cam mechanism giving an axial force corresponding to the transmission torque to a pulley and preventing too much belt pressing force.
Abstract: This invention relates to a belt driven continuously variable transmission having a pressure regulating cam mechanism giving an axial force corresponding to the transmission torque to a pulley and preventing too much belt pressing force. A retainer is fixed on a boss section of a stationary sheave and a spring made of multiple disc springs is situated on the outer surface of a boss section of a movable sheave for contact the retainer. A spring apparatus is composed of the retainer and the spring. Accordingly, at the decelerating range with large shifting ratio, besides the axial force made by the pressure regulating cam mechanism, the spring apparatus generates pressing force by contacting the retainer and maintains the belt holding force. When the shifting ratio is small, the spring returns to its natural length and disengages from the retainer.

36 citations

Patent
04 Apr 1958

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023104
2022235
2021173
20201,029
20191,981
20183,674