JPH0547801U - Tape measure - Google Patents

Abstract

(57) [Summary] [Purpose] A case in which a drum in which a scale is wound is housed, a rewind spring is housed in the drum, the rewind spring is tightened when the scale is pulled out, and the scale is pulled out by its restoring force. In a tape measure having a structure for rewinding a reel, a tape measure that can reduce the diameter of the central shaft that locks the base end of the rewind spring to a minimum and further shorten the rewind spring to downsize the drum and the entire case. To provide. [Structure] A cutout for locking the base end of a rewind spring is provided on a central shaft provided on one side of the divided case body, and an insertion hole through which the cutout and a part of the circumferential side communicate is penetrated to the outside of the divided case body. The metal rod inserted into the insertion hole through the small hole formed in the other divided case body is fixed at the opening end of the insertion hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a tape measure of a type in which a mainspring spring is contracted when a scale is pulled out and the scale is rewound by its restoring force.

[0002]

[Prior Art]

 There is a conventional tape measure disclosed in Japanese Utility Model Publication No. 62-192963, which reduces the diameter of the central shaft to shorten the rewind spring and downsize the entire drum and case. However, there is a problem that the central axis beyond the tip of the tap screw that is inserted and tightened in the insertion hole of the central axis is broken by the impact of the drop of the tape measure and becomes unusable. is doing. Moreover, it is impossible to further reduce the diameter of the central axis with the above configuration.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems of the above-described conventional technology, and an object of the present invention is to make the diameter of the central shaft as small as possible, and to provide a rewind spring. It is intended to provide a tape measure that can further shorten the length and downsize the entire drum and case.

[0004]

[Means for Solving the Problems]

 According to the means of the present invention, a central shaft 5 provided on one of the divided case bodies 1a is provided with an insertion hole 7 through which a notch 6 and a part of the peripheral side communicate with each other, and the other through the outside of the divided case body 1a. This is because the tip of the metal rod 10 inserted into the insertion hole 7 through the small hole 9 formed in the dividing case body 1b is fixed at the open end of the insertion hole 7 by screwing, locking, or adhesive.

[0005]

【Example】

 In the figure, reference numeral 1 is a case, which is formed by combining two divided case bodies 1a and 1b. A scale 2 is wound around a drum 3, and the drum 3 is housed in the case 1. Reference numeral 4 denotes a rewinding spring housed in the drum 3. When the scale 2 is pulled out, the rewinding spring 4 is wound and the scale 2 pulled out by the restoring force is rewound. Reference numeral 5 denotes a relatively small-diameter central axis that protrudes from the center of the split case body 1a, and at the eccentric position, a notch 6 having a depth of about 1/2 of the width of the rewind spring 4 is formed from the tip. The narrow base end 4a of the rewind spring 4 is locked in the notch 6. An insertion hole 7 that is continuous with the cut 6 of the central shaft 5 and a part of the circumferential side is provided so as to penetrate the split case body 1a from the tip of the central shaft 5, and a fitting recess 8 for a nut 12 is formed at the open end. .. Then, the metal rod 10 is inserted into the insertion hole 7 from the small hole 9 bored in the divided case body 1b, the threaded portion 11 provided at the tip end is screwed into the nut 12, and the head portion 10a is expanded into the expanded portion of the small hole 9. To lock and fix. Instead of the nut 12, the tip of the metal rod 10 may come from the end or may be fixed with an adhesive. Reference numeral 13 is an annular groove formed in the divided case body 1a, and an annular projection 14 provided on the lower side of the drum 3 is fitted therein, so that the drum 3 rotates smoothly.

[0006]

[Action and effect]

 According to the present invention, since the metal rod is pierced through the central shaft for reinforcement, the diameter of the central shaft can be made as small as possible, which shortens the rewinding spring to reduce the entire drum and case. Can be miniaturized. Moreover, there is no possibility that the central shaft will be broken even if it receives an impact.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a tape measure according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is an inner side view of one of the split case bodies.

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Case 1a, 1b Divided curse body 2 Scale 3 Drum 4 Rewind spring 4a Narrow base end 5 Central axis 6 Notch 7 Insertion hole 8 Fitting recess 9 Small hole 10 Metal rod 11 Screw part 12 Nut

Claims (1)

[Scope of utility model registration request] 1. A case 3 accommodates a drum 3 around which a scale 2 is wound, and a rewind spring 4 for rewinding the scale 2 is accommodated inside the drum 3 and the rewind spring 4 is used when the scale 2 is pulled out. A central shaft 5 having a relatively small diameter is projected from one of the two split case bodies 1a and 1b forming the case 1, and the eccentric position is about the width of the rewind spring 4 from the tip. In the tape measure in which the cut 6 having a depth of ½ is formed and the narrow base end portion 4a of the rewinding spring 4 is locked in the cut 6, the central shaft 5 provided on the one divided case body 1a. To the notch 6
And a part of the peripheral side of the metal rod 10 is inserted through the insertion hole 7 through the outside of the divided case body 1a, and the insertion hole 7 is inserted through the insertion hole 7 from the child hole 9 formed in the other divided case body 1b. A tape measure in which is attached at the open end of the insertion hole 7 with a screw, a lock-up, or an adhesive.