JP3195769U - Tape measure - Google Patents

Abstract

Provided is a tape measure that can reduce the rotational frictional resistance of a rotating drum when winding a tape at a low cost. A resin bushing made of nylon (trade name) is fitted on a shaft that supports a rotating drum, and the rotating drum is supported by the bush. [Selection] Figure 1

Description

  The present invention relates to an automatic winding type tape measure, and more particularly to a tape measure that can reduce the rotational frictional resistance of a rotating drum when winding a measuring tape.

  Nowadays, most of the tape measure is an automatic winding type tape measure that automatically winds the measurement tape, and it winds the measurement tape around the winding drum and winds the measurement tape. The rotating drum is provided with a spiral spring as an urging means to be taken, and a case for storing the rotating drum. Since the measuring tape is usually stored in the case, when measuring, pull the locking piece provided at the tip of the measuring tape that is locked to the measuring tape inlet / outlet of the case with your finger, and then pull it out. A desired measurement is performed by appropriately pulling out the measured tape.

  Then, when the measurement tape is stored in the case after the measurement is completed, the measurement tape is released from the rotating drum in the case by releasing the braking of the measurement tape stopped by the braking device or the hand. The measuring tape is automatically wound into the case by the restoring force of the spring incorporated therein, and the locking piece at the leading end of the measuring tape is locked at the inlet / outlet of the measuring tape, whereby the winding of the measuring tape is completed. Further, it is common that an impact buffering member that relaxes (including an absorbing function) the collision energy of the collision pieces (tip hooks) that collide is provided at the measurement tape doorway.

  In this type of tape measure, the members of the tape measure such as the case and the rotary drum are usually formed by integral molding using a resin material having excellent moldability. Therefore, the rotary drum is drawn out of the measuring tape. In addition, a gap is provided between the rotating drum and the base of the shaft to prevent the resin from fusing together during winding (because the frictional resistance is particularly large when the same material slides). . That is, since the rotating drum is pivotally supported in a loosely fitted state on the shaft, the rotation is in contact with the shaft and the inner wall of the case, and although the above-described fusion between the resins can be prevented, the rotation is extremely frictional. It was rotating under resistance (contact resistance). In particular, if the rotating drum rotates at a high speed when winding the measuring tape, the vibration of the rotating drum contacting the shaft and the inner wall of the case is also transmitted to the user's hand, and the quality impression given to the user is very bad. It was.

Japanese Patent Laid-Open No. 11-160001

  The object of the present invention is to provide a rotational friction resistance of a rotating drum when winding a measuring tape at a low cost without changing the integral molding method using a resin material that is rational and extremely easy to mold. It is to be able to provide a tape measure that can reduce the size of the tape.

  In order to solve the above-described problems, a tape measure according to the present invention includes a rotating drum in which a measuring tape is wound around and includes a biasing means for biasing the measuring tape in the winding direction. The tape measure is pivotally supported on an inner shaft, wherein the rotary drum is pivotally supported via a resin material bush fitted on the shaft.

  The tape measure of the present invention will be described in detail. The case is a member that accommodates the measuring tape and is also the main body of the tape measure. The case is made of a resin material appropriately formed in a desired shape. A shaft is erected on the side wall of the case, and a measuring tape having a memory printed on the shaft is wound around the case. The rotating drum is supported. Further, a spiral winding spring for winding the measuring tape is provided inside the rotating drum, and the measuring tape is biased in the winding direction. The case is integrally molded using a resin material having excellent moldability. However, the case is not limited to this and may be formed using other materials such as a metal material. Even if the case is made of a metal material, the rotating drum is pivotally supported via a resin material bush fitted on the shaft, so that the resin material rotating drum and the metal material case are slid. It doesn't move.

  The shaft is erected on the inner wall of the case as described above, and the erected form is erected by using an appropriate structure or method depending on the length, width, material, etc. of the measuring tape to be accommodated. Yes. As a concrete example of standing, a female screw is threaded on one end surface or both end surfaces of the shaft, and the male screw is screwed onto the female screw from the outside of the case through a through-hole formed in the side wall of the case. The shaft is fixedly installed on the inner wall of the case. Further, the shaft is erected on the inner wall of the case by molding the shaft integrally with the case when the case is molded.

  In the installation of the shaft, only the shaft may be erected, and in this case, the rotating drum is fitted to the shaft body. However, there is a case where a protrusion having an appropriate height is provided around the shaft, close to the shaft or appropriately separated from the shaft, and in this case, the rotating drum is fitted to the shaft main body or the protrusion described above. It fits into a strip. Therefore, the shaft in this specification includes not only the shaft body but also a protrusion formed around the shaft. That is, an appropriate part (member) formed in the case and fitted with the rotating drum is also interpreted as a part of the shaft.

  The measuring tape enters and exits from the measuring tape inlet / outlet provided under the front wall of the case, and when the winding of the measuring tape is finished, the locking piece at the tip of the measuring tape Is locked to the measuring tape inlet / outlet of the case, thereby preventing the measuring tape from being pulled into the case. Since the locking piece collides with the measuring tape inlet / outlet at a considerable speed, generally, the shock absorbing member for relaxing the collision energy of the locking piece (including the absorbing action) at the measuring tape inlet / outlet. Is provided.

  A bush made of a resin material is provided at an appropriate portion between the tape measure shaft and the rotary drum configured as described above, for example, at the base of the shaft. That is, the rotating drum is pivotally supported via a resin material bush set on the shaft. And although the said bush may be provided with a single item, you may provide it combining several bushes of the same shape and different shape suitably.

  As a specific example in the interposition of a bush, a general cylindrical thing inserts the through-hole which a bush has in a shaft, and fits a rotation drum on the perimeter of the bush. Alternatively, the bush may be attached by fitting the outer periphery of the bush into a through hole formed in the center of the rotating drum, and the shaft may be fitted into the through hole of the bush. In addition, the bush with the eaves protruding outward at one end of the bush body is set on the shaft with the eaves side facing the side wall of the case, and the outside of the side wall of the rotating drum is the bush eaves It is preferable to set the rotating drum on the shaft so as to come into contact.

  The bush may be provided on the tip end side of the shaft in addition to the shaft base side. Specifically, if the case is divided into two, the first bush is set at the base of the shaft (the base of the shaft) in the half case on the side where the shaft is erected, and in the other half case. The second bush is set on the tip support portion for supporting the tip of the shaft, and a through hole for passing the shaft on both side walls of the rotating drum is fitted on the outer periphery of the bush. Also, when both the first bush and the second bush are provided, if only one of these can be installed to reduce the rotational frictional resistance of the rotating drum, only one of them may be installed without arranging both.

  And as a material of a bush, it is good to use nylon (brand name) excellent in deformation resistance and abrasion resistance. Note that a resin material formed mainly of nylon (trade name) is also included in the nylon (trade name). In order to further reduce the sliding resistance, an oil-impregnated bush in which oil is immersed in the bush body may be used.

  Of course, the above-described interposition form of the bush is not limited to this, and may be intervened by a suitable form or method.

  According to the tape measure of the present invention, the rotational frictional resistance of the rotating drum when winding the measuring tape can be remarkably reduced by pivotally supporting the rotating drum via the bush made of a resin material.

  The price of the bush is very low, and the operation of setting the bush on the shaft can be easily performed. Therefore, it is a very excellent means for reducing the rotational frictional resistance that can reduce the rotational frictional resistance of the rotating drum at a low cost.

  Further, since the rotating drum also rotates stably, vibration and sliding sound when winding the measuring tape are greatly reduced, and thereby the quality impression given to the user can be remarkably improved. That is, it contributes to quality improvement of the tape measure.

  And since the rotational frictional resistance of a rotating drum becomes small, the winding spring (spiral spring) of the measuring tape used conventionally can also be changed into a low-torque winding spring. The fact that the torque can be reduced means that the mass of the take-up spring can be reduced, so that the cost can be greatly reduced (the unit price is determined by the weight of the spring material). In addition to offsetting the cost increase, the cost of manufacturing the tape measure can be reduced.

  Furthermore, the fact that the torque of the winding spring can be reduced greatly contributes to the improvement of durability of the measuring tape including the winding spring and the measuring tape tip hook, and the weight of the measuring tape itself.

The partial notch schematic which shows the inside of the half case of the shaft standing side of the tape measure which concerns on this invention. The expansion perspective view which showed an example of the bush. The partial schematic sectional drawing of a tape measure.

  Hereinafter, the tape measure concerning this invention is demonstrated based on the specific example shown to an accompanying drawing. FIG. 1 is a partially cutaway schematic view showing the inside of a half case on the shaft standing side of this tape measure, and a shaft 2 that supports a rotating drum 1 is erected on a side wall 4 of the half case 3. A bush 5 made of a resin material is fitted into the base 2 a of the shaft 2. Reference numeral 1 a in the figure is a through hole for fitting to the shaft 2 formed on the winding drum side wall 1 b of the rotary drum 1. Reference numeral 6 denotes a measuring tape wound around a winding drum.

  Moreover, the bush 5 shown in a present Example uses the bush which has a part which protrudes outward in the end of a main body. (A) in FIG. 2 is an enlarged view of the bush 5, and reference numeral 5 a is a cylindrical portion of the bush 5 and has a through hole 5 b that fits into the shaft 2. Reference numeral 5 c denotes an eaves projecting outwardly formed at one end of the cylindrical portion 5 a, and the eaves surface 5 d of the eaves 5 c and the outer surface of the winding drum side wall 1 b of the rotary drum 1 are in contact with each other.

  FIG. 2B is an enlarged view of the vicinity of the base portion of the shaft 2 shown in FIG. 1, and the through hole 5 b of the bush 5 is fitted in the base portion 2 a of the shaft 2. It is desirable that the fitting is configured so that some play occurs.

  FIG. 3 is a partial schematic cross-sectional view of the tape measure. FIG. 3A shows a rotating drum in a form in which the opening 1e of the accommodating portion 1d for setting the winding spring 1c of the rotating drum 1 is opened. In the case of this rotary drum 1, one bush 5 set on the shaft 2 standing on the side wall 4 of the half case 3 is provided on the base 2 a of the shaft 2. That is, the rotary drum 1 is pivotally supported via the bush 5 set on the base portion 2 a of the shaft 2 standing on the side wall 4 of the half case 3.

  (B) in FIG. 3 shows a rotating drum in a form in which a lid 1f is provided in the opening 1e of the accommodating portion 1d for setting the winding spring 1c of the rotating drum 1 and the opening 1e is closed. In the case of the rotary drum 1, the bush 5 set on the shaft 2 standing on the side wall 4 of the half case 3 has two portions, a base portion 2a of the shaft 2 and a tip support portion 2b that supports the tip of the shaft 2. Is provided. That is, the rotating drum 1 is pivotally supported via a bush 5 set on a base 2 a of the shaft 2 standing on the side wall 4 of the half case 3 and a tip support portion 2 b of the shaft 2. Further, the contact portion of the rotating drum 1 that contacts the eaves surface 5d (see FIG. 2) of the bush 5 set on the tip support portion 2b is in the opening 1e of the housing portion 1d in which the winding spring 1c of the rotating drum 1 is set. It is the surface of the provided lid 1f.

  In addition, in the case of (b) in FIG. 3 provided at two locations, the base portion 2a of the shaft 2 and the tip support portion 2b that supports the tip of the shaft 2, either the base portion 2a or the tip support portion 2b is installed. As long as the rotational frictional resistance of the rotating drum 1 can be reduced, either one of the base portion 2a and the tip support portion 2b may be provided instead of the two portions.

DESCRIPTION OF SYMBOLS 1 ... Rotating drum 1a ... Through-hole 1b ... Winding drum side wall 1c ... Winding spring 1d ... Storage part 1e ... Opening 1f ... Lid 2 ... Shaft 2a ... Base 2b ... Tip support part 3 ... Half case 4 ... Side wall 5 ... Bush 5a ... Cylinder part 5b ... Through hole 5c ... Eaves 5d ... Eaves surface 6 ... Measurement tape

Claims (4)

  The measuring tape is wound around the circumference, and a rotary drum having a biasing means for biasing the measuring tape in the winding direction is pivotally supported on a shaft in the case, and is A tape measure characterized in that a drum is pivotally supported via a resin material bush fitted on the shaft.   The tape measure according to claim 1, wherein the resin material is nylon.   The tape measure according to claim 1, wherein an eaves projecting outward is formed at one end of the bush.   The tape measure according to claim 1, wherein the bush is an oil-impregnated bush.

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