Boots – shoes – and leggings
Patent
1987-11-19
1990-01-23
Lall, Parshotam S.
Boots, shoes, and leggings
377 24, 33759, G01B 308
Patent
active
048962805
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tape rule.
BACKGROUND
The provision of an electronic tape rule in which a digital readout of tape position is combined with an ability to perform calculation using tape position as an input is described in Japanese Utility Model No. SHO 51-71937, U.S. Pat. Nos. 4161781 (Hildebrandt), 4181959 (Tateishi), 4181960 (Tateishi et al.), 4316081 (Washizuka) and UK Patent Specifications Nos. 2102121 (Souic Tapei) and 2052745 (Wines). However the above references require the user to carry out two key operations to display the result of a calculation based on a previous tape position and do not provide for updating the result continuously based on current tape position.
SUMMARY OF THE INVENTION
In one aspect the invention provides a tape rule comprising a tape that may be extended from a housing and that carries a position track therealong, reading means in the housing past which the position track travels during movement of the tape, first processor means electrically connected to the reading means for receiving electrical signals therefrom and generating an output state indicating an extension of the tape, visual readout means for providing a visual display of tape extension and second processor means electrically connected to the visual readout means and to the first processor means for communication of the output state and arranged in a first operative state to pass a signal significant of real tape extension to the visual readout means and responsive to selector means to pass to a second operative state in which subsequent real tape extensions are operated on using an earlier extension value stored in memory and a result is passed to the visual readout means.
The ability to execute arithmetical calculations in real time depending upon a current position of the tape enables a "tab" function to be provided in which a flag portion of the display is illuminated when the tape has been pulled out a distance which is at or close to a multiple of a previous distance.
In a further aspect the invention provides a tape rule comprising a tape that may be extended from a housing and that carries a position track therealong, reading means in the housing past which the position track travels during movement of the tape, first processor means electrically connected to the reading means for receiving electrical signals therefrom and generating an output state indicating an extension of the tape, visual readout means, and second processor means electrically connected to the visual readout means and to the first processor means for communication of the output state and arranged to respond to operation of selector means to store a then existing real tape extension in memory and subsequently to determine whether a subsequent real tape extension differs from an integer times the stored tape extension by no more than a predetermined permissible distance, and to indicate the existence of such a relationship on the visual readout means.
In a yet further function which is preferably included, on actuation of further selector means second processor means divides the real tape extension by two and outputs the result to the visual readout means.
In a yet further aspect the invention provides a tape rule comprising a tape that may be extended from a housing and that carries a position track therealong, reading means in the housing past which the position track travels during movement of the tape and processor means electrically connected to the reading means for receiving electrical signals therefrom and generating an output stage indicating an extension of the tape and visual readout means for providing a visual display of tape extension in accordance with the output state, wherein a datum position is provided on a side of the housing from which the tape extends and either the processor means corrects the information read from the tape when generating the output state by allowing for an offset between the sensors and the datum position or the effective start of the position track is offset from the start of
REFERENCES:
patent: 4161781 (1979-07-01), Hildebrand
patent: 4181848 (1980-01-01), Iwase
patent: 4181959 (1980-01-01), Tateishi
patent: 4195348 (1980-03-01), Kakutani
patent: 4233749 (1980-11-01), Coulter et al.
patent: 4242574 (1980-12-01), Grant
patent: 4491928 (1985-01-01), Reichl
patent: 4519709 (1985-05-01), Nelle
patent: 4535415 (1985-08-01), Hird
patent: 4551847 (1985-11-01), Caldwell
patent: 4575944 (1986-03-01), Lin
patent: 4604725 (1986-08-01), Davies
patent: 4628201 (1987-12-01), Schmitt
patent: 4701615 (1987-10-01), Schmitt
patent: 4747215 (1988-05-01), Waikas
patent: 4779211 (1988-10-01), March
Dixon Joseph L.
Lall Parshotam S.
The Stanley Works
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