JPS5847362Y2 - tape measure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape measure, and in particular to an automatic winding tape measure with a braking device that utilizes a wedge effect.The purpose of this invention is to remove the measuring tape from the tape measure case and use it alone. To provide a tape measure that can be used and also allows measurements to be taken even when combined with a case.

The conventionally known self-winding tape measure with a braking device that utilizes a wedge effect includes a measuring tape, a case with a measuring tape guide opening on the lower front wall, and a measuring tape that is housed inside the case and has a winding mechanism for the measuring tape. A spiral spring whose free end engages with the starting end and always biases the measuring tape in the winding direction, and an operating part that protrudes outward from the front wall of the case, and an arc-shaped member connected to this spring moves up and down inside the front wall. The tape measure also includes a braking device in which a shoe formed at the lower end of the arc-shaped member wedges the measuring tape with the bottom wall when the arc-shaped member is positioned downward.

The present invention relates to an improvement of this type of tape measure, and will be described in detail below with reference to the drawings. Reference numeral 1 is a case of a tape measure body having a guide opening 4 for a measuring tape 3 under a front wall 2.

Reference numeral 5 denotes a fixed shaft provided in the inner shaft of the case 1. A fixed end 7 of a spiral spring 6 is attached to the fixed shaft 5, and its free end 8 passes through an opening 10 of a rotating drum 9 and is connected to the circumference of the drum 9. The measuring tape 3 is always urged in the winding direction by meeting the winding start end 11 of the measuring tape 3 being wound up.

The spiral spring 6 and the measuring tape 3 are held together by providing a circular hole 12 in the measuring tape 3 and a T-shaped engagement piece 13 at the free end 8 of the spiral spring 6, as shown in the figure, so that the spiral spring 6 and the measuring tape 3 can be removably engaged. However, any other structure may be used as long as it can be removably engaged.

14 is a braking member for the measuring tape 3, and the braking member 1
Reference numeral 4 denotes an operating section 15 that protrudes outward from the front wall 2 of the case 1.
It consists of an arc-shaped member 16 that is connected to the operating section 15 and moves up and down inside the front wall 2.

A shinny 17 is connected to the lower end of the arc-shaped member 16, and when the arc-shaped member 16 is moved downward, this shoe 17 contacts the surface of the measuring tape 3 and creates a measurement gap between it and the bottom wall 18. Wedge tape 3.

The brake member 14 is configured so that the shoe 17 can be braked and released by operating the operating section 15, but the arc-shaped member 16
One end of the shoe 17 may be pressed by a spring to maintain a braking state at all times, and the shoe 17 may be moved upward against the spring to release the wedging effect on the measuring tape 3.

19 is an oval hole-shaped notch formed slightly rearward of the free end 8 of the spiral spring 6, and is engaged with this notch 19;
An engaging protrusion 20 that prevents the spiral spring 6 from being wound up into the case 1 during engagement is provided in a protruding manner below the operating portion 15 of the braking device 14.

However, the notches 19 are formed at both ends of the spiral spring 6 as shown in FIG. It may be something that is locked.

Since the present invention is constructed as described above, when using the measuring tape 3 in conjunction with the case 1, push up the operation part 15, release the brake on the measuring tape 3, and adjust the length to an appropriate length. When performing measurement work by pulling out the measuring tape 3 from the case 1 and using it separately, release the brake and pull out all of the measuring tape 3 out of the case 1, and also partially pull out the spring spring 6. Pull it out until it comes.

Then, the free end 8 of the spiral spring 6 is bent toward the operating section 15, and the notch 19 of the spiral spring 6 is inserted into the operating section 15.
to engage with the engaging protrusion 20 of.

In this state, the measuring tape 3 is removed from the T-shaped free end 13 of the spiral spring 6, and the two are released.

When the force applied to the operating part 15 is released, the brake member 14 is pulled downward together with the spring spring 6 due to the unwinding of the spring spring 6. A shoe 17 formed at the lower end of the spring 6 contacts the surface of the spring 6 and wedges and brakes the spring 6 between it and the bottom wall 18, and the spring 6 stops at the position shown in Fig. 4 and prevents its retreat. thwarted.

As described above, the present invention allows the measuring tape 3 and the case 1 to be used in a connected state, or the measuring tape 3 can be completely separated from the case 1 and used as the measuring tape 3 itself. The mating protrusion 20 and the notch 19 are respectively connected to the operating section 15.
It is sufficient to form the spring 6 on the spiral spring 6, and no other changes are required, so the manufacturing cost is low.Furthermore, when the measuring tape 3 is separated, the shoe 17 comes into contact with the spiral spring 6 and brakes it, so a strong braking force is generated. That's what you get.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the tape measure according to the present invention, showing the measuring tape in a non-braking state, Fig. 2 is a plan view showing the engagement of the measuring tape and the spiral spring, and Fig. 3 is , a front view showing a state in which the measuring tape is removed and the spiral spring is locked to the engagement protrusion of the operating section, FIG. 4 is a longitudinal sectional view in the state shown in FIG. 3, and FIG. 5 shows another embodiment. FIG. 4 is a front view showing the state shown in FIG. 3; 1...Case, 2...Front wall, 3...
...Measuring tape, 4...Guidance port, 6...
...Spring spring, 8...Free end, 11...
... Winding start end, 14 ... Braking member, 15 ...
...Operation unit, 16... Arc-shaped member, 17...
... Shoe, 19 ... Notch, 20 ...
...Engagement protrusion.

Claims (1)

[Scope of utility model registration request] 1. A measuring tape, a case having a guide opening for the measuring tape at the lower part of the front wall, and a case that is installed inside the case and whose free end engages with the winding start end of the measuring tape to constantly wind the measuring tape inside the case. A spiral spring that biases the operation part in the direction of the front wall of the case, an arc-shaped member connected to the operating part that moves up and down inside the front wall, and when the arc-shaped member is moved downward, the arc-shaped member In a tape measure, a shoe formed at the lower end of the measuring tape is detachably engaged with a braking device that wedges the measuring tape between the bottom wall of the case and the free end of the mainspring spring. A notch is formed slightly rearward from the free end, and an engaging protrusion is provided below the operating part of the braking device to prevent the winding of the mainspring spring when engaged with the notch. Features a tape measure. 2. Utility model registration claim 1, wherein the notch is a circular hole, and the engaging protrusion is sized to fit into the circular hole.
Tape measure listed in section. 3. A utility model characterized in that the notch is formed at both ends of the spiral spring, the engaging protrusion has a concave center and a convex end, and the curved portion fits into and engages the notch. A tape measure according to registered claim 1.