JPH0355849Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a reel-shaped rule winding drum that is mounted inside the case of a tape measure.

[Conventional technology]

As shown in FIG. 12, the rule winding drum of a conventional tape measure is comprised of a winding drum main body 2 having a rule winding shaft 1, and a side plate 3 that is integrally fitted into the main body 2.

However, the winding drum has an outer case 4 of the tape measure,
5, the shaft 6 is loosely fitted to the shaft 6 provided in the center of the inner wall surface of one of the cases 4, so that it can rotate freely.
Wrap the spring 7 around the other end 8 of the spring 7.
The rule is fixed to the take-up shaft 1 of the take-up drum so that the take-up drum is rotated by the elastic force of the spring 7, and the rule 9 is wound around the rule take-up shaft 1 of the rule take-up drum. It is used as a member for pulling the rule 9 pulled out from the cases 4 and 5 into the cases 4 and 5.

There are various types of fitting between the main body 2 and the side plate 3 in conventional rule winding drums, but since the rule winding drum is subjected to rapid forward and reverse rotation when using a tape measure, its durability is limited. It had its pros and cons, and I couldn't quite get what I was satisfied with.

[Problem that the invention attempts to solve]

When using a tape measure, the rule winding drum is repeatedly subjected to rapid forward and reverse rotations, and as a result, the engagement between the winding drum main body and the side plate that was integrally fitted to the main body gradually loosens, causing the winding to deteriorate. The smooth rotation of the take-up drum is obstructed, making it difficult to pull out and retract the rules, and eventually the side plate separates from the main body of the take-up drum, making it impossible to pull out and retract the rules.

[Means for solving problems]

The rule winding drum of this invention has a cylindrical rule winding shaft with a collar on one end and a plurality of U-shaped protrusions with claws formed on the other end. A drum body, a fitting hole into which the U-shaped convex portion is fitted, a through-hole portion consisting of a slit connected to the hole, and a small hole into which the claw at the end of the U-shaped convex portion is fitted and engaged by rotation. The problem was solved by constructing a side plate with a side plate.

[Effect]

The rule winding drum of this invention has a U-shaped protrusion on the winding drum body that is inserted into the insertion hole in the through hole of the side plate, and when the side plate is rotated, a U-shaped shape that continues on the winding drum body is formed. The base of the convex portion enters the slit of the through hole, and at the same time, the claw slides on the surface of the side plate and engages with the small hole, so that the winding drum body and the side plate are integrally engaged.

〔Example〕

The rule winding drum of this invention is composed of a winding drum main body A shown in FIGS. 1 to 4, and a side plate B shown in FIGS. 5 to 8.

First, the winding drum body A will be explained with reference to FIGS. 1 to 4. Winding drum body A
A cylindrical rule winding shaft 10 is provided with a collar 12 on one side edge thereof having a through hole 11 in the center for fitting a shaft provided at the center of the inner wall surface of the outer case of the tape measure. At the side edge, the base slightly protrudes from the side edge, is bent inward, and the end is further bent in a direction parallel to the axis of the cylindrical rule winding shaft 10 to form a claw 1.
3 are provided at equal intervals. Reference numeral 15 denotes a notch used to attach a rule and a spring for drawing the rule to the winding drum.

Next, the side plate B will be explained with reference to FIGS. 5 to 8. The side plate B has an outer diameter equal to the collar 12 of the winding drum body, and a through hole 11 is provided in the center thereof into which a shaft provided in the outer case of the tape measure is inserted. 16 is centered on the center of the side plate,
Along the circumference of an imaginary circle having a diameter equal to the outer diameter of the rule winding shaft 10, a hatchet-shaped through-hole part has a fitting hole 17 into which the U-shaped convex part 14 is fitted, and a slit 18 connected to the fitting hole 17. Further, inside the slit 18, an independent small hole 19 is provided adjacent to and parallel to the slit 18.

In the drawings showing the embodiment of this invention, the number of U-shaped protrusions 14 on the rule winding body is shown as three, but it may be two or four or more depending on the size of the rule winding drum. In that case, the positions and numbers of the through holes 16 and small holes 19 provided in the side plate should naturally correspond to the positions and numbers of the U-shaped protrusions 14.

In assembling the rule winding drum of the present invention from the winding drum main body and side plate described above, the ninth
As shown in the figure, the insertion hole 17 of the through-hole part 16 of the side plate
After inserting the U-shaped protrusion 14 on the winding drum main body, when the side plate is rotated in the direction of arrow A, the base of the U-shaped protrusion 14 provided on the winding drum main body becomes a through hole. At the same time, the claw 13 passes through the slope 20 (see FIG. 11) provided on the left side edge of the insertion hole 17 in FIG.
The claws 13 are pushed up onto the surface of the side plate and slid on the surface, and as shown in FIG. The rule never separates from the main body of the winding drum.

Therefore, in order to make a tape measure using the rule winding drum of this invention, the winding drum main body A is rotatably fitted onto a shaft located at the center of the inner wall of one of the outer cases, and a spring is wound around the shaft. Attach the other end of the spring to the notch 15 and wind it up to the drum body A.
The rule winding shaft 10 is pulled out and fixed together with the rule end, and the winding drum is rotated by the elastic force of the spring, and the rule winding side plate B is attached to the side surface of the rule winding shaft 10. and attach the side plate B to the winding drum main body A according to the procedure already detailed.
Then, the fitting surface of the side plate B is covered with the other exterior case, and both exterior cases are fixed together to complete the process.

[Effect of idea]

As described in detail above, the rule winding drum of this invention has a cylindrical rule winding shaft with a collar on one end and a plurality of U-shaped claws on the other end. A winding drum main body having a convex portion, a through-hole portion consisting of an insertion hole into which the U-shaped convex portion is inserted, and a slit connected thereto, and a claw at the end of the U-shaped convex portion that is fitted into the hole by rotation. It consists of a side plate having a small hole that fits, and after the U-shaped protrusion on the winding drum body is inserted into the insertion hole of the through hole of the side plate, the side plate is rotated. The base of the U-shaped protrusion provided on the winding drum body enters the slit in the through hole, and at the same time the claw slides on the surface of the side plate, reaches the small hole, and fits into the small hole. Even if the tape measure's rule winding drum is repeatedly rotated rapidly in forward and reverse directions, the connection between the winding drum body and the side plate will not loosen or come off, preventing the rule from being pulled out or retracted. This makes it possible to use the tape measure firmly and permanently without being damaged, and has an extremely excellent effect on the durability of the tape measure.

[Brief explanation of drawings]

Figure 1 is a plan view of the main body of the winding drum used in this invention, Figure 2 is a top and bottom view of the same, and Figure 3 is a top view of the main body of the winding drum used in this invention.
Figure 4 is a partial line sectional view taken from Figure 1, Figure 5 is a plan view of the side plate used in this invention, Figure 6 is a top and bottom view of the same, and Figure 7 is a partial view taken from Figure 5.
8 is a sectional view taken along the line taken from FIG. 5, FIGS. 9 and 10 are a plan view illustrating the engagement between the winding drum body and the side plate, and FIG. 11 is a partial sectional view taken taken along the line taken from FIG. , FIG. 12 is an exploded view of a conventional tape measure. 1, 10... Rule winding shaft, 2, A... Winding drum body, 3, B... Side plate, 12... Tsuba, 13
...Claw, 14...U-shaped protrusion, 16...Through hole,
17...Insertion hole, 18...Slit, 19...Small hole.

Claims (1)

[Scope of utility model registration request] The cylindrical rule winding shaft has a flange on one end.
The other side end includes a winding drum main body each having a plurality of U-shaped protrusions with claws formed at the ends, and a transparent body consisting of an insertion hole into which the U-shaped protrusions are inserted and a slit connected to the insertion hole. 1. A rule winding drum comprising a side plate having a hole and a small hole into which the claw at the end of the U-shaped convex portion is fitted and engaged by rotation.