Tape lock mechanism

Details Tape lock mechanism Tape lock mechanism

1993-09-16

1995-01-10

Cuchlinski, Jr., William A.

Geometrical instruments

Distance measuring

By flexible tape

33769, 2423813, G01B 310

Patent

active

053795237

ABSTRACT:
A retractable tape measure is disclosed which includes a housing having an opening formed therein, a coiled tape rule within the housing and a free end extending through the opening. A coiled spring is provided to retract the tape rule into the casing and a lock assembly is provided to selectively lock the tape rule in an extended position and release it for retraction into the casing. The lock assembly includes an actuator member that is pivotally mounted on the casing for pivotable movement between a locking and an unlocking position and a tape locking blade having one end positioned to engage the tape and an other end defining a bearing surface, the tape locking blade being mounted in the casing for movement between locking and unlocking positions. A connecting link is provided which has one end located in bearing engagement with the bearing surface of the locking blade and an opposed end pivotally connected to the actuator member in a predetermined position to provide an over-the-center action to lock the blade in the locking position. The locking blade includes integrally formed spring arms engaged with the casing for applying a biasing force to the locking blade to urge the locking blade against the locking action of the actuator member and thereby move the locking blade to the unlocked position when the actuator member is moved to its unlocked position.

REFERENCES:
patent: 3570782 (1971-03-01), Hayes et al.
patent: 4474340 (1984-10-01), Duda
patent: 4663854 (1987-05-01), Miller et al.
patent: 4976048 (1990-12-01), Blackman
patent: 4998356 (1991-03-01), Chapin
patent: 5001843 (1991-03-01), Chapin
patent: 5007178 (1991-04-01), Dewire et al.
patent: 5210956 (1993-05-01), Knispel

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