Electronic digital tape-rule

Details Electronic digital tape-rule Electronic digital tape-rule

1985-06-19

1986-03-18

Little, Willis

Geometrical instruments

Area integrators

Electrical

33139, 33125C, 250237G, 377 24, G01B 310

Patent

active

045759448

ABSTRACT:
An electronic digital tape rule consisting of a housing, a tape reel having an extendable and flexible measuring tape, a battery case, an actuator, a detector, a counter, a display and a brake. The actuator comprises a friction roll rotatably mounted on a shaft fixed at an inner wall of the housing, a disc disposed on the upper end of the roll and rotatable by the friction of the roll, a plate fixed on the upper end of the roll and having a hole with a pair of contact plates attached on the two side walls of the hole, a spring mounted between the disc and the plate for constantly pressing the disc against the roll and an actuating rod disposed upright on the upper side of the disc and having its upper end engaging with the hole. The actuating device in cooperation with the friction rolls can accomplish the switching action corresponding to the directions of rotation of the friction rolls.

REFERENCES:
patent: 4150282 (1979-04-01), Aoki et al.
patent: 4164816 (1979-08-01), Bergkvist
patent: 4178691 (1979-12-01), Tateishi
patent: 4181959 (1980-01-01), Tateishi
patent: 4181960 (1980-01-01), Tateishi
patent: 4316081 (1982-02-01), Washizuka et al.

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