THE DIFFERENTIAL PULLEY OR CHAIN HOIST

Lesions of the biceps pulley.

BACKGROUND Lesions of the biceps pulley and instability of the long head of the biceps tendon are common diagnoses in patients with anterior shoulder pain. PURPOSE To analyze the pathoanatomy of the biceps reflection pulley ("pulley") in consecutive patients undergoing shoulder arthroscopy. STUDY DESIGN Cohort study (prevalence); Level of evidence, 2. METHODS Prospective data were collect...

Dual Adjustable Pulley (CMDAP)

Frequency control of crane hoist speed

The voltage of the stator is usually controlled with thyristors. To ensure stable control of the load, the control system requires information about the motor speed. Up to now, tachometers or encoders have been used to measure the motor speed, however, tachometers, with their associated equipment, tend to be mechanically sensitive and are often difficult to install, due to space constraints. Th...

Multicyclic hoist scheduling with constant processing times

This paper proposes an exact algorithm for the multicyclic schedules of hoist moves in a printed circuit board (PCB) electroplating facility, where exactly ( 1) parts enter and parts leave the production line during each cycle, and the processing time at each production stage is a given constant. The multicyclic scheduling problem is transformed into enumeration of intervals for linear function...

The effect of partial A2 pulley excision on gliding resistance and pulley strength in vitro.

PURPOSE The purpose of this study was to investigate the effect of partial excision of the A2 pulley on the gliding resistance and the strength of the residual pulleys in a human in vitro model with or without tendon repair. METHODS We used 32 cadaveric human fingers from 11 cadavers. The A2 pulley was excised successively 25%, 50%, and 75%, cutting either from the distal toward the proximal ...