Deceleration device of a tape rule
First Claim
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1. A deceleration device of a tape rule comprising:
- a housing composed of two sub-housings, an axle being erected on the center portion of one of the two sub-housings, and an aperture being provided nearby said axle;
a reel with a through hole at its center thereof, said axle being penetrating via said through hole such that said reel being rotatable about said axle in said housing driven by a transmission gear wheel coaxially fitted to said reel such that said reel is able to extend a measuring tape coiled on it, or retrieve the extended tape back; and
a deceleration unit whose speed reduction gear wheel being set up in said sub-housing via said aperture and being in mesh with said transmission gear wheel of said reel for retarding the rotation of said reel.
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Abstract
A deceleration device of a tape rule is equipped with a speed reduction gear wheel in the tape rule housing. The speed reduction gear wheel is in mesh with a transmission gear wheel of a reel for coiling a measuring tape such that the rotational speed of the reel when retrieving the extended tape is retarded thereby preventing the danger of scratching the user'"'"'s finger or damaging the tape itself by abrasion or impingement. Engagement of the speed reduction gear wheel and the transmission gear wheel can be released by operating a flat pusher plate provided on the housing.
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Citations
8 Claims
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1. A deceleration device of a tape rule comprising:
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a housing composed of two sub-housings, an axle being erected on the center portion of one of the two sub-housings, and an aperture being provided nearby said axle;
a reel with a through hole at its center thereof, said axle being penetrating via said through hole such that said reel being rotatable about said axle in said housing driven by a transmission gear wheel coaxially fitted to said reel such that said reel is able to extend a measuring tape coiled on it, or retrieve the extended tape back; and
a deceleration unit whose speed reduction gear wheel being set up in said sub-housing via said aperture and being in mesh with said transmission gear wheel of said reel for retarding the rotation of said reel. - View Dependent Claims (3, 4)
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2. A deceleration device of a tape rule comprising;
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a housing composed of two sub-housings an axle being erected on the center portion of one of the two sub-housings, and an aperture being provided nearby said axle, while a post and a circular hole is provided on the outer surface of said sub-housing;
a reel with a through hole at its center thereof, said axle being penetrating via said through hole such that said reel being rotatable about said axle in said housing driven by a transmission gear wheel coaxially fitted to said reel such that said real is able to extend a measuring tape coiled on it, or retrieve the extended tape back, and a deceleration unit with a speed reduction gear, one terminal of said deceleration unit has a through hole, while the other terminal thereof is formed into a hook;
said speed reduction gear wheel is set up in said sub-housing via said aperture and is in mesh with said transmission gear wheel of said reel for retarding the rotation of said reel, after aligning said through hole with said circular hole provided on said sub-housing, and penetrating a hinge pin therethough, said deceleration unit is hinged to the outer surface of said sub-housing and is displaceable to and fro thereon so as to engage or disengage said speed reduction gear wheel with said transmission gear wheel. - View Dependent Claims (5, 6, 7, 8)
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Specification