JPS6342321Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a component unit for a tape measure, and particularly to a component unit for a tape measure in which a coil spring and a drum for winding a tape measure are made into a single component in a tape measure with an unwinding spring.

To assemble a tape measure with a spring for rewinding, a coil spring is normally loaded onto a shaft formed in the half case of the tape measure case, a drum is fitted onto this shaft, the outer end of the coil spring is secured to this drum, and then the drum is attached. Accumulate unwinding energy in the coil spring by rotating it by hand, and while keeping it in that state, connect the measuring tape to the outer end of the coil spring or the drum, cover it with another half case, release the tape from the tape, and remove the measuring tape. The tape is wrapped around the peripheral wall of the drum. However, these tasks must be done by hand, and
This requires considerable skill and time, which causes an increase in the manufacturing cost of tape measures.

For this reason, in recent years there has been a tendency to incorporate tape-shaped coils into a drum during the process of winding them into a coil to form a single unit to simplify the work of installing it into a case, and several such component units have been seen. By the way. However, in these conventional parts units, separate parts are used to maintain the energy storage state of the coil spring, and mounting to the case still requires the same skill as in the past. It cannot be said that all labor-saving problems have been solved.

In view of this, the present invention seeks to provide a spring-equipped tape measure component unit that allows the maintenance of the energy storage state in the drum of the coil spring and the installation of the coil spring into the case with an extremely simple configuration and operation. This will be explained below with reference to the drawings.

Reference numeral 1 denotes a component unit, and this component unit 1 consists of a drum 2, a coil spring 3, and a shaft plate 4. The drum 2 is of a cantilever type, and a shaft hole 6 is formed in the center of its web 5. The winding drum 8 around which the measuring tape 7 is wound is the web 5.
It is erected against. 9, 9' are this winding drum 8
These flanges are formed on both sides of the measuring tape 7, and are used to shape the winding state of the measuring tape 7. Also, 1
0 has a wide part 11 formed on the winding drum 8 into which the coil spring 3 enters, and the terminal end thereof is a locking window that is locked with a part facing outside, and the opposite side of the web 5 is an opening 12. It is becoming. 13 is a notch formed in the winding drum 8 on the side of the opening 12;
It consists of a guide part 14 through which a protrusion formed on the shaft plate 4 (to be described later) enters and exits, and a protrusion locking hole 15 connected to the guide part 14 and bored in the circumferential direction of the winding drum 8, and has an L-shape. has been achieved. In the drawing, two protrusions are provided in the diametrical direction, but one, three or more may be provided, and the number corresponds to the number of protrusions formed on the shaft plate 4.

The shaft plate 4 consists of a circular plate 16 having a diameter that fits loosely within the opening 12 of the drum 2 so as to be rotatable internally therein, and a shaft 17 erected at the center of one side of the circular plate 16. A plurality of protrusions 18 that can be inserted into the notches 13 of the drum 2 are provided on the peripheral edge of the circular plate 16 in a diametrical direction.
As shown in the figure, a cylindrical edge 19 rotatably inscribed in the opening 12 of the drum 2 may be continuously provided on the peripheral edge of the plate 16, and the protrusion 18 may be formed on this cylindrical edge 19. A locking groove 20 for locking the winding start end of the coil spring 3 is bored in the shaft 17, and a locking groove 20 is formed in each half case 22 of the tape measure case 21 so that the shaft plate 4 is fixed to the tip and base ends of the locking groove 20. Convex portion 23
Further, the length of the shaft 17 is such that the protrusion 18 of the shaft plate 4 enters the protrusion locking hole 15 of the notch 13 of the drum 2, and the recesses 24 and 25 are fixedly fitted into the drum. When the shaft plate 2 and the shaft plate 4 are fitted into each other, a portion of the tip of the shaft plate 4 protrudes outward from the web 5. On the other hand, at least one of the half cases 22 has a means for fixing the shaft plate 4, for example, a convex portion 23 that fits into the recess 24 of the shaft plate 4, and when the half cases 22 are fitted together to accommodate the component unit 1, ,
The protrusion 18 of the shaft plate 4 is connected to the notch 13 of the drum 2.
The drum 2 is rotatably supported in a state of being released from the drum.

For example, one inner wall of the half case 22 is flat, and the other half case 22 has a protrusion 18 at the notch 1.
3, the circular plate 16 including the protrusion 18
A recess 26 is formed into which the
Even if the protrusion 18 escapes from the notch 13, the circular plate 16 will not allow the protrusion 18 to escape from the plane of the flange 9'.
If it is installed so as to protrude outward on 6,
A recess into which only the protrusion 18 can fit may be provided in the inner wall of the half case 22. In any case, when the protrusion 18 of the shaft plate 4 becomes detachable from within the notch 13 of the drum 2, the entire drum 2 moves on the shaft 17 toward the tip of the shaft 17 due to the external force applied during fitting. By moving the drum 2, the lock between the drum 2 and the shaft plate 4 is released, and the drum 2 can be freely rotated. Note that the notch 13 of the drum 2
When the shaft plate 4 is fixed to the guide part 14 and the drum 2 is rotated in one direction by the energy of the coil spring 3, the protrusion locking hole 15 is formed in the opposite direction to the rotation direction of the drum 2. However, coil spring 3
When the winding direction of the guide part 14 changes,
The notch 13 of the protrusion locking hole 15 may be approximately Y-shaped.

Since the present invention is constructed as described above, the winding start end of the tape-shaped spring 3, which has not yet been coiled, is locked in the locking groove 20 of the shaft 17 of the shaft plate 4, and the shaft plate Rotating means for gripping the periphery of 4 and rotating it or recess 2 of shaft plate 4
5 as a socket, insert it into this and attach the shaft plate 4.
The spring 3 is tightly wound in a coil around the shaft 17 using a rotating means that rotates the spring 3. Next, the winding end is locked in the locking window 10, and the shaft plate 4 is inserted into the opening 12 of the drum 2. At this time, the protrusion 1 of the shaft plate 4 is
8 and when the protrusion 18 reaches inside the protrusion locking hole 15, when the drum 2 is released, this guide part 1
4, a protrusion locking hole 15 is formed in the circumferential direction of the winding drum 8 of the drum 2 in the opposite direction to the rotating direction of the drum.
The protrusion fits into the locking hole 15, and further rotation of the drum 2 is prevented, and the coil spring 3 retains the unwinding energy. Furthermore, in order to easily carry out such work, the drum 2 and shaft plate 4 should be assembled in advance.
With the latter protrusion 18 not inserted into the notch 13 of the drum 2 and the drum 2 being able to rotate on the shaft 17, the winding start end of the spring 3 is inserted through the wide part 11 of the locking window 15, and the shaft 17 After inserting into the locking groove 20 of the drum 2, only the shaft plate 4 is rotated, and when the end of the winding of the spring 3 is located in the locking window 10, the notch 13 of the drum 2 and the protrusion 18 of the shaft plate 4 are rotated. You may also perform locking work with the Traditionally, the work of winding springs into coils has been done by coil spring manufacturers rather than by tape measure manufacturers, and the above work is extremely easy to incorporate into the conventional coil spring manufacturing process. It is desirable that the tape measure manufacturer entrusts the drum 2 and the shaft plate 4 to a coil spring manufacturer, and that the coil spring manufacturer delivers the tape measure component unit 1 to the tape measure manufacturer through the above process.

The parts unit 1 delivered in this way is
In the tape measure manufacturing process at a tape measure manufacturer, the parts are assembled into a tape measure using simple assembly operations. That is, in the tape measure assembly process, the winding start end of the tape measure tape 7 is connected to the coil spring 3, one end of which is protruding from the winding barrel 8 or the locking window 10.
In this state, the half case 22 is fitted. The shaft 17 protrudes from the web 5 of the drum 2, and when the tape measure case 21 is fitted onto the shaft 17, the protrusion 18 of the shaft plate 4 escapes from the notch of the drum 2, allowing the drum 2 to rotate freely. If the protrusion 23 of one half case 22 is fixedly inserted into the recess 24 of the shaft plate 4, even if the other half case 22 is fitted, the shaft 17 will not protrude. It will not mate because it is When the measuring tape 7 is pulled forward in this state, the drum 2 rotates against the coil spring 3, and the protrusion 18 of the shaft plate 4 fixed to the half case 22 faces the guide part 14 from the protrusion locking hole 15. , the user can freely escape from this guide portion 14 to the outside. Therefore, an additional half case 22
When the mutual widths of the flange 9' are narrowed, the protrusion 18 passes through the guide portion 14 and exits the flange 9'. The shaft 17 is
Since the drum 2 partially protrudes to the outside, when the drum 2 disengages from the shaft plate 4, the drum 2 moves on the shaft 17 of the shaft plate 4 toward its tip. Since the protrusion 23 of the half case 22 is fitted into the recess 24 at the tip of the shaft 17, the drum 2 remains supported on the shaft 17. In this detached state, the half cases 22 are fitted together and the accumulated unwinding energy of the coil spring 3 is released, so the drum 2 rotates rapidly and at the same time, the tape measure is applied around the winding drum 8. The tape 7 is wrapped around the measuring tape 7.
The hook formed at the end of the winding engages with the opening of the case. All that is left to do is to screw the half cases 22 together or glue them together to complete the tape measure body.

As mentioned above, the tape measure unit 1 in the present invention
It consists of a simple structure in which only a notch 13 and a protrusion 18 are formed in each of the drum 2 and the shaft plate 4, and these structures can be formed integrally when molding each part, so manufacturing is extremely easy. Not only that, but the process of making units is almost the same as the work conventionally required by coil spring manufacturers to form coil springs, so even if a tape measure manufacturer outsources the desired parts to a coil spring manufacturer, it would be a burden on the work. However, the assembly work at the tape measure manufacturer is greatly simplified. That is,
The tape measure tape 7 is connected to the component unit 1 delivered to the tape measure maker, and the half case 22 of the tape measure case is prepared separately as described above.
Apply it from both sides, fix the shaft plate 4 to one half case, and then pull out the measuring tape a little.
The shaft plate 4 and drum 2 are now in a removable state,
If the half-case 22 is further pushed in the opposite direction in this state, the engagement between the two is released, the drum 2 rotates, and the measuring tape 7 is rapidly wound onto the drum 2. Therefore, the assembly time is significantly shortened and productivity is improved, and even if the component unit 1 is damaged, it can be easily replaced by the consumer.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the drum of the component unit according to the present invention, Fig. 2 is a sectional view of the shaft plate, and Fig. 3 is a sectional view of the shaft plate.
4 is a front view of the component unit showing a state in which the drum and the shaft plate are locked together. FIG. 5 is a perspective view showing another embodiment of the drum. FIG. 6 is an exploded cross-sectional view showing a state before the tape measure case is fitted onto the component unit, and FIG. 7 is a cross-sectional view showing the component unit assembled into the tape measure case together with the tape measure tape. 1... Parts unit, 2... Drum, 3... Coil spring, 4... Shaft plate, 5... Web, 7
... Tape measure tape, 8 ... Winding barrel, 10 ... Locking window,
12...Opening, 13...Notch, 14...Guiding part, 15...Protrusion locking hole, 16...Circular plate, 17...Shaft, 18...Protrusion, 19...Cylinder edge,
20... Locking groove, 21... Tape measure case, 22...
Half a case.

Claims (1)

[Scope of utility model registration request] A cantilever type drum having a shaft plate with a shaft erected on one side, a winding drum in which the shaft hole of the web is rotatably supported on the shaft and loosely fitted circumferentially on the shaft plate; It consists of a component unit consisting of a coil spring that is engaged with the shaft of the plate and is engaged with the winding barrel of the drum with its end partially exposed to the outside, and two half cases that house this component unit. A projection is provided on the periphery of the drum, and a guide portion into which the projection of the shaft plate enters when the shaft plate is fitted into the drum, and a projection that extends in the circumferential direction of the drum winding body and extends from the guide portion. A notch consisting of a locking hole is formed in the winding drum on the open side of the drum, the shaft of the shaft plate partially protrudes outside the web of the drum, and a half case is formed at the tip of the shaft of the shaft plate. A concave part is formed that is fixedly engaged with a convex part provided on one inner wall, and by adjusting the position of the drum relative to the shaft plate, the engagement between the shaft plate and the drum is released, and the drum can freely rotate half the case. A tape measure characterized in that the above component units are housed between each other.