Coilable rule casing

Details Coilable rule casing Coilable rule casing

G - Physics

01

B

33/153

G01B 3/10 (2006.01)

Patent

CA 1135956

ABSTRACT A composite casing for a coilable rule comprises a pair of inner, plastic case members and a thin, outer metal case which receives the plastic case members in a close fitting relationship. A center post is received in central openings provided in the plastic case members to support a measuring tape and coil spring of the rule. One end of the center post has an enlarged head and its other end receives an as- sembly screw extending through holes in the metal case to engage and hold the metal case in firm assembly with the plastic case members. A series of knurls is formed on the center post for engaging one of the plastic case members to hold the post firmly in place. Alternatively, the center post may be formed as an integral part of one of the plastic case members. A plurality of deformable ribs may be pro- vided on the exterior surfaces of the plastic case members to engage the metal case and firmly hold the assembly to- gether.

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