JPS5877601A - Case for tape measure - Google Patents

Abstract

PURPOSE:To reduce the abnormal rubbing sounds owing to irregular winding of a barrel spring by providing a steady rest in a transverse direction in a case half within a slit where the detaining end of the barrel spring is provided to a core shaft. CONSTITUTION:The inside end of a barrel spring 9 is made slightly narrow in width and is detained by inserting the same into the slit 10 of a core shaft 5. The detaining end of the spring 9 in the slit 10 is anchored by a set screw 12 having an anchoring leg end 11 and a rod-like projection 13 projected in a case half 1', whereby the deviation in an axial direction is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the lack of a measuring tape, and in particular proposes an improvement to a measuring tape that reduces the splashing noise that occurs when handling the measuring tape.

Generally, this type of tape measure has a drum for winding the scale tape mounted in an internal cavity formed between two case half shells, and the inner end of a barrel spring built into this drum is usually It is adapted to be engaged with a slit of a core shaft which is provided in one of the case half shells and protrudes across the internal cavity.

The barrel spring is tightened when the scale tape is pulled out and loosened when it is retracted, so that when the scale tape is fully retracted, the barrel spring is in its most relaxed position.
When the scale tape begins to be drawn out, the inner end of the barrel spring tends to shift laterally during the core axis lift.

When the inner end of the barrel spring is tightened at a position that is shifted laterally, it often comes into contact with the side wall of the drum in a so-called bamboo shoot state, and this occurs when the scale tape is pulled out or retracted. This was a cause of spring friction noise, and when the case half shell is made of die-cast metal, such as zinc or aluminum, noise is caused by the bamboo shoot winding of the barrel spring and is brought to the drum. Further axial resistance is added between the shaft and the case half shell due to the thrust force.

Therefore, in order to effectively reduce such spring friction noise, this invention suppresses the movement of the barrel spring in the slit at the locking inner end, prevents the occurrence of bamboo shoots, and prevents the tape measure from rolling. A new method has been devised to ensure that the barrel spring is wound in an aligned manner during use. .

This invention consists of a pair of case half shells, in which a scale tape winding drum is pivotally mounted within the internal cavity formed by these case half shells, and extends into the internal cavity between the case half shells. In a tape measure case of the type in which the inner end of the barrel spring installed in the drum is locked in a slit provided in the core shaft, the above problem is solved by making the case half shell stand within the slit. be.

The steady rest can advantageously be implemented by means of a pressure screw with a restraining leg end that projects from the outer surface of at least one case half through the core shaft into the slit, and this pressure screw, in particular By making the cover made of plastic, noise reduction and weight reduction can be achieved, and an embodiment can advantageously be adopted in which the cover is also used as a set screw for a decorative cover such as a metal cover, which also helps improve the solid appearance of the case. .

Now, Figure Ki illustrates the cross section of the tape measure case, and 7. /
I is a pair of case half shells, C is an internal cavity formed between them, and 3 is a drum for marking the end of a scale tape, which is pivoted inside this internal cavity.
' is the pivot boss of drum 3, again! is boss l, l/
It is a core axis extending into the internal cavity λ concentrically with λ.

In this example, the case where the core shaft S is integrally provided on one case half shell l and fitted into the receiving hole t provided in the boss of the other case half shell 1t is shown. When taking measures to integrate both case half-shells /, '/I, the case half-shells /, '/I may be separate from the case half-shells /, '/I.

The drum 3 forms a spring chamber t between it and the lid 7, and, according to custom, has a so-called spiral barrel spring 9 built therein, the outer end of which is drawn in through a partial opening provided in the body wall of the drum J. The inner end of the barrel spring 9 is usually annealed over a length of several tens of meters, and the inner end of the scale tape (not shown) is annealed, and a slit is cut into the core shaft S to form a narrow width. Insert it into 10 and press #! Wrap and lock as shown in the diagram. Figure 3(a) shows the shape of both ends of the barrel spring.
O shown in the example in FIG.
lacks restraint in the axial direction, and when the winding is loose, it tends to shift laterally, and at that time, in the process of winding and tying by pulling out the scale tape, it becomes so-called bamboo winding and thrust is exerted on the drum 3, causing a spring scraping sound. It turned out to be the cause.

Therefore, in this invention, the barrel spring 9 is
The occurrence of the above-mentioned thrust is prevented by providing a steadying means for restraining the locking end of the locking end in the width direction thereof.

In other words, as shown in FIG. 1, this restraining means includes a set screw 12 having a restraining leg end // that projects into the slit lo through a core shaft 3 integral with the case half shell, and a case half shell lI. Although not shown, both case cow shells / and /' have a rod-shaped protrusion 13 protruding from the center of the inner surface of the case.
with 2 or rods/3.

It may also be used as a

In particular, when using the set screw 12 as a restraining means, 1
The decorative cover l# as shown in the JIE 1 diagram showing its application to the left case half shell l can also be used as a set screw that is restrained by the countersunk head of the set screw 12, with or without the backing plate lS. In addition, this countersunk head can also be used as a makeup cover.
The nameplate l≦ may be attached to the nameplate. In addition, in Figure 1, the decorative cover /'II applied to the right case half shell /' is riveted to the case half shell 1t)
An example of fixing by /7 is shown, but case half shell 7
The same deterrence as described above may be performed.

Decorative cover/(1,/41' is a half shell of Tess/ , /
If) Covering the sides, preferably providing grooves /l, /II on the periphery of the case half-shell /, /I, and at the bottom of the groove, the substance of the case half-shell, preferably made of a plastic molded body. It is also possible to use a metal cover with jagged irregularities that fit inside the cover.

Based on the above-mentioned configuration, the inner end of the barrel spring 9 ensures aligned winding of the barrel spring 9 within the slit 10 of the core axis j under restraint without causing any axial deviation. , there is no ability to exert thrust on the drum J, which eliminates the drawback of causing spring friction noise during drawing out and feeding in of the scale tape.

Thus, according to the present invention, the tape measure case does not generate a spring scraping sound caused by irregular winding of the barrel spring during the iy1 draw-in and draw-in operations of the scale tape, and the scale tape can be adjusted by the frictional force derived from the spring scraping sound. The tape measure can be conveniently used without excessive pull-out force or poor retraction.

[Brief explanation of the drawing]

Figure 7 is a sectional view of the tape measure case, Figure 1 is a sectional view of the main part,
FIGS. 3(a) and 3(b) are end plan views of the barrel spring. /I...Case half shell, K...Inner cavity, 3...
·drum,! ...core shaft, t...spring chamber, 9...barrel spring, lθ...slit, //, /j...steady rest, /2...push screw, /41. /l'...Makeup cover. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] L Consists of a pair of case half shells, in which a drum for marking the scale tape is pivotally mounted within the internal cavity formed by these case half shells, and an internal cavity extending between the case half shells. In a tape measure case of the type in which the inner end of the barrel spring installed in the drum is locked in a slit provided in the core shaft extending inward, the case half shell holds the locking end of the spring in the slit in the direction of its radius. A tape measure case characterized by being equipped with a steady rest. z. The tape measure nurse according to L, wherein the stopper is a set screw having a stop leg end that projects from the outer surface of at least one of the case half shells into the slit through the core shaft. δ The tape measure case described in L, wherein the push screw also serves as a set screw for a decorative cover provided on the outer surface of the case half shell.