Tape-type linear measuring instrument
AssigneeStanley-Mabo S.A.
InventorMichel C. A. Quenot
Life of this patent
Estimating the term…
Abstract
This tape-type linear measuring instrument comprises a perforated tape adapted to be unwound from or wound on a drum enclosed in a case containing a tape-engaging toothed wheel possibly driven from a motor with the interposition of a speed reducer. Pick-up means responsive to reference marks carried by the wheel or by a member rigid therewith control the operation of an electronic up-and-down counter associated with means for the digital display of the measured length. A shifting pinion may be interposed between the winding drum and the tape-driving toothed wheel to enable the motor to drive the tape both ways. The perforations may be replaced by spaced notches, and a support wheel may be disposed under the tape in co-planar relationship with the driving wheel.
Claims29
A tape-type linear measuring instrument comprising an instrument case, a measuring tape, a winding drum for said measuring tape, means for winding and unwinding said tape on or from said winding drum, a speed reducer having a high speed shaft and a lower speed shaft, a wheel coupled with the low speed shaft of said speed reducer and engaging said measuring tape so as to rotate in synchronishm with translational movement of said tape, an electronic pick-up comprising a movable element coupled with the high speed shaft of said speed reducer and provided with reference marks disposed at spaced intervals and a pick-up element for sensing passage of said reference marks, an electronic counter connected with and responsive to said pick-up, and means for digitally displaying the reading of said counter.
A tape-type linear measuring instrument comprising an instrument case, a measuring tape, a winding drum for said measuring tape, and means for winding and unwinding said tape on and from said winding drum comprising a driving wheel directly engaging said tape, a speed reducer having a low speed shaft and a high speed shaft, an electric motor coupled with the high speed shaft of said reducer and a shifting pinion coupled with the low speed shaft of said reducer and shiftable between a first position in which it is coupled with said tape driving wheel and a second position in which it is coupled with said winding drum for winding said tape.
A tape-type linear measuring instrument comprising an instrument case, a metal measuring tape, a winding drum for said measuring tape, and means for winding and unwinding said tape on and from said winding drum comprising a return spring acting on said winding drum in a direction to wind the tape on said winding drum, a speed reducer having a low speed shaft and a high speed shaft, an electric motor coupled with the high speed shaft of said speed reducer, a driving wheel coupled with the low speed shaft of said reducer and directly engaging said tape to drive said tape, and means for reversing the direction of rotation of said driving wheel for winding and unwinding said tape.
A tape-type linear measuring instrument comprising an instrument case, a metal measuring tape, a winding drum for said measuring tape, means for winding and unwinding said tape on and from said winding drum comprising a speed reducer having a low speed shaft and a high speed shaft, an electric motor coupled with the high speed shaft of said speed reducer, a driving wheel coupled with the low speed shaft of said speed reducer and directly engaging said tape to drive said tape, and means for reversing the direction of rotation of said driving wheel for winding and unwinding said tape, means rotatably supporting said winding drum for free rotation, and at least one free roller and spring means for urging said roller against the periphery of tape wound on said winding drum to ensure regular and proper winding of the tape on said winding drum.
A tape-type measuring instrument comprising an instrument case, a measuring tape, a winding drum for said measuring tape, and means for winding and unwinding said tape from said winding drum comprising a driving wheel directly engaging said tape, a speed reducer having a low speed shaft and a high speed shaft, an electric motor coupled with the high speed shaft of said reducer, means coupling the low speed shaft of said speed reducer with both said driving wheel and said drum to drive both said driving wheel and said drum simultaneously, and means for reversing the direction of rotation of said driving wheel and said drum to unwind and rewind said tape.
Dependencies are inferred from the claim text.