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Apparatus for measuring length of an elongate cable. A frame having a hole therethrough includes a pair of rollers mounted for rotation thereon. The circumferences of the rollers are rollingly engaged with one another over the hole and a cable which is to be measured is held between the rollers and

Apparatus for measuring length of an elongate cable. A frame having a hole therethrough includes a pair of rollers mounted for rotation thereon. The circumferences of the rollers are rollingly engaged with one another over the hole and a cable which is to be measured is held between the rollers and passed downwardly through the hole thereby rotating the rollers. A magnet is mounted on one of the rollers adjacent the circumference thereof. Mounted on the frame adjacent the circumference of the roller having the magnet mounted thereon is a magnetically-activated switch which closes each time the magnet passes thereby. The switch provides an input to a transmitter which generates a signal including pulses indicative of the number of rotations of the wheel having the magnet mounted thereon. The signal is received by a receiver and the pulses are counted and displayed in order to provide a visual indication of the number of pulses, such being directly proportional to the length of cable which passes between the rollers.

대표청구항 ▼

A measuring apparatus comprising: a substantially planar frame; a first axle support mounted on the upper side of said frame; a first axle mounted on said first axle support; a first roller rotatably mounted on said first axle; a second axle support mounted on the upper side of said frame; a second

A measuring apparatus comprising: a substantially planar frame; a first axle support mounted on the upper side of said frame; a first axle mounted on said first axle support; a first roller rotatably mounted on said first axle; a second axle support mounted on the upper side of said frame; a second axle mounted on said second axle support; a second roller rotatably mounted on said second axle, said first and second axles being substantially parallel and the edges of said rollers being opposite one another; a tubular base extending downwardly from the lower side of said frame with the axis of said base being at a substantially right angle to said frame; an opening in said frame to permit communication between the interior of said base and the upper side of said frame; a first slot formed in said frame and extending from one edge thereof to said opening; a second slot formed axially in said tubular base along the length thereof, said first and second slots being in alignment with one another; a magnet mounted on one of said rollers adjacent the circumference thereof; and means for detecting a magnetic field mounted on said frame adjacent the circumference of the roller having said magnet mounted thereon.