JPH05164502A - Measuring tape with slip preventive mechanism - Google Patents

Abstract

PURPOSE:To prevent slip of a take-up drum without causing damage, lowering of a resisting force, etc., of a measuring tape, by a method wherein a rotable roller is brought into contact with the outer periphery of a roll of the measuring tape and the resistance under its own weight is applied to the rotation of the take-up drum. CONSTITUTION:A case 1 having a grip 12 formed in the upper part and a tape gateway 13 formed in the lower part is formed of two side plates 11 opposed to each other. On the inner wall surfaces of the two side plates 11, guides 14 crossing the outer periphery 31 of a roll of a measuring tape 3 are provided oppositely in extension from the grip 12. A roller 4 is fitted movably between the guides 14 and it is made to slide along the guides 14 under its own weight and abut on the outer periphery 31 of the roll rotatably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape measure with a slip prevention mechanism.

[0002]

2. Description of the Related Art In a tape measure in which a long tape measure tape is unwound and unwound around a take-up cylinder rotatably mounted between two side plates, the tape measure tape is rapidly pulled out from a tape inlet / outlet port. Then, the inertial force acting on the take-up cylinder causes the take-up cylinder to idle excessively and the outer circumference of the tape measure becomes slack to prevent smooth withdrawal. Therefore, it is necessary to prevent the take-up cylinder from idling.

Conventionally, as a tape measure for preventing the idling, an elastic body is sandwiched between the winding cylinder and the side plate, and the repulsive elastic force of the elastic body presses the winding cylinder against the inner wall surface of the other side plate. The winding cylinder is provided with resistance to prevent the winding cylinder from idling, and as described in Japanese Utility Model Publication No. 56-7841, the end surface of the tape measure wound on the winding cylinder and the inner wall surface of the side plate are It has been proposed that an elastically deformable leaf spring is sandwiched between the leaf springs and the repulsive elastic force of the leaf springs provides resistance to the end surface of the tape measure to prevent the winding cylinder from idling.

[0004]

However, in the former tape measure, since the take-up cylinder is pressed against the inner wall surface of the side plate, the contact surface between the take-up cylinder and the side plate is worn and the resistance is lowered. In addition, there are drawbacks such that separate screws and locking rings are required to sandwich and support the elastic body.

On the other hand, in the latter tape measure, resistance is applied to the end surface of the tape measure by the repulsive elastic force of the leaf spring, so that the end surface of the tape measure is worn and damaged due to the resistance, or the leaf spring is aged daily. However, there was a defect that it was deformed into a sheet and the resistance was lowered.

The present invention solves the above-mentioned problems of the conventional tape measure and provides a tape measure having an idling prevention mechanism excellent in durability such as no damage to the tape measure tape and a reduction in resistance. It is something to do.

[0007]

In order to achieve the above object, the present invention has the following configuration. That is, a tape measure with a slip prevention mechanism according to the present invention is composed of two side plates facing each other, a case having a handle at the upper part and a tape entrance / exit at the lower part, and a rotatable shaft between the two side plates. A tape measure consisting of a wound take-up cylinder and a long tape measure wound around the take-up cylinder so that it can be unwound freely. On the inner wall surface of the two side plates, from the bottom of the handle to the outer circumference of the tape measure. Intersecting guides are extended so as to face each other, and a trochanter is loosely fitted between the guides, and the trochanter slides along the guides according to the size of the outer circumference of the tape measure due to its own weight. However, it is characterized in that the outer circumference of the winding is rotatably abutted.

[0008]

The mechanism for preventing slipping of the tape measure according to the present invention will be described. As described above, guides intersecting with the outer circumference of the tape measure are provided on the inner wall surfaces of the two side plates so as to face each other and extend from the lower side of the handle. , The trochanter is loosely fitted between the guides, and the trochanter slides along the guide according to the size of the outer circumference of the tape measure by its own weight, and rotatably contacts the outer circumference of the tape. Therefore, even if the size of the outer circumference of the tape is reduced due to the amount of the tape to be pulled out, the trouser slides along the guide by its own weight while being in contact with the outer circumference of the tape, Since the resistance force due to the weight of the trochanter is always applied to the outer circumference of the winding to prevent idling of the winding cylinder and the rotator is rotatably abutted against the outer circumference of the winding, No tape tape wear due to force.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view of a tape measure according to the present invention, FIG. 2 is a sectional explanatory view showing movement of a trochanter in the tape measure of FIG. 1, FIG. 3 is a perspective view of the trochanter, and FIG. 4 is a tape measure of the tape measure of FIG. It is a front view of the pulled-out state.

In FIG. 1, reference numeral 1 denotes a case in which two side plates 11 made of synthetic resin, metal or the like are formed so as to face each other.
A handle 12 is formed on the upper portion and a tape port 13 is formed on the lower portion. The handle 12 is composed of an upper grip portion 121 that is gripped by hand and a lower space portion 122 into which the hand is inserted, and two guide rollers 15 are vertically rotatable in the tape inlet / outlet 13. It is pivoted.

2 is a handle 12 of the case 1 and a tape entrance / exit 1.
3 is a winding drum provided substantially in the center of the winding drum, and is rotatably mounted between the two side plates 11. One end of the winding drum 2 is located outside the side plate 11. The handle 21 is bulged, and the handle 21 is attached to the bulged end, and the winding cylinder 2 is rotated by a knob 22 axially attached to the tip of the handle 21.

The handle 2 is attached to the end of the winding cylinder 2.
Regarding the attachment of No. 1, the handle 21 may be directly integrated with the end of the winding drum 2 so that the rotation of the handle 21 is transmitted to the winding drum 2 at the same speed.
1 may be integrated with the winding cylinder 2 via a plurality of gears so that the rotation of the handle 21 is accelerated and transmitted to the winding cylinder 2.

Reference numeral 3 is an ordinary long tape measure tape made of fiber, metal or the like and having a scale printed on the surface, and has a length in the range of about 10 m to 100 m. The tape measure 3 is inserted / removed by inserting it between two guide rollers 15 axially attached to the tape entrance / exit 13, and the two side plates 11 are operated by operating a handle 21.
It is wound around a take-up cylinder 2 which is mounted between them so that it can be unwound freely.

On the inner wall surfaces of the two side plates 11 forming the case 1, from the lower side of the handle 12, the outer circumference 3 of the tape measure 3 is wound.
The guides 14 intersecting with each other are extended to face each other, and the trochanter 4 is loosely fitted between the guides 14 facing each other. The trochanter 4 is made of synthetic resin, metal or the like, and has a cylindrical contact portion 41 and a shaft 4 projecting from both end surfaces thereof as shown in FIG.
2 and the shafts 42 on both end faces are loosely fitted to the opposing guides 14 so that the trochanter 4 is rotatable between the guides 14 and the trochanter 4 is owing to its own weight. Guide 14 corresponding to the size of the outer circumference 31
The contact portion 41 is always rotatably in contact with the outer circumference 31 of the winding so that a resistance force by the weight of the trochanter 4 is applied to the outer circumference 31 of the winding.

Although the contact portion 41 and the shaft 42 may be integrally formed in the trochanter 4 as described above, the contact portion 41 having a hollow cylindrical shape and the shaft 42 having a rod shape may be separately formed. The contact portion 41 may be rotatably fitted on the shaft 42 to be formed. The material and dimensions of the trochanter 4 were tested by using a tape measure tape 3 having a width of 12 mm and made of vinyl chloride having glass fiber as a core material. As a result, the material of the trochanter 4 has good abrasion resistance. It is preferable that the weight of the trochanter 4 is 15 to 20 g and the contact portion 41 of the trochanter 4 has a diameter of 16 mm and a length of 15 mm. However, the material and size of the trochanter 4 are not limited to those described above, and may be appropriately selected depending on the material and shape of the case 1 and the tape measure 3.

As shown in FIG. 2, the guide 14 is preferably formed in the inner wall surface of the two side plates 11 with a groove slightly wider than the diameter of the shaft 42 of the trochanter 4 from the viewpoint of appearance. You may form by the slit which notched to the outer wall surface of the side plate 11.

The guide 14 may be linearly extended from below the handle 12 toward the center of the outer circumference 31 of the tape measure 3 so as to intersect the outer circumference 31 of the tape, as shown in FIG. If it is bent and extended from below the end of the space portion 122 of the handle 12 so as to intersect with the rotation direction of the winding outer circumference 31 when the tape measure 3 is pulled out, at an incident angle in the range of 30 degrees to 60 degrees. When the tape measure 3 is suddenly pulled out, the trochanter 4 is abutted so as to bite into the outer circumference 31 of the winding, and the resistance of the trocar 4 acts on the outer circumference 31 of the winding slightly stronger than its own weight. The trochanter 4 receives the force in the direction opposite to the biting direction and is released from the biting, the resistance applied to the winding outer circumference 31 is reduced, and the idling is more effectively prevented.

Further, the guide 14 may be extended from below the handle 12 to reach the outer peripheral wall of the winding cylinder 2, but normally, when the winding outer circumference 31 of the tape measure 3 is large, a large inertial force is exerted. As shown in FIG. 1, it may be extended to a range where a large inertial force is exerted, for example, to a position about half the size of the maximum winding outer circumference 31 of the tape measure tape 3.

The method of using the tape measure with the anti-slip mechanism according to the present invention will be described. The handle 12 of the tape measure case of the present invention is held upward with the handle 12 side facing upward and the tape inlet / outlet 13 side facing downward. Tape entrance / exit 13 like a tape measure
The tape measure tape 3 may be pulled out and rolled up. When the tape measure tape 3 is pulled out and rolled up, the tape shown in FIG.
As described above, the size of the outer circumference 31 of the tape measure 3 has a small diameter corresponding to the amount of the drawn tape measure 3,
Corresponding to the winding outer circumference 31, the trochanter 4 is guided by its own weight.
It slides along 4 and always contacts the outer circumference 31 of the winding.

Since the trochanter 4 abutting on the outer circumference 31 of the tape measure 3 rotates in reverse due to the contact resistance with the outer circumference 31, the resistance due to its own weight is applied to the outer circumference 31 of the tape. The take-up cylinder 2 always keeps the trochanter 4 without abrasion.
When the winding outer circumference 31 is rotated by a resistance force due to its own weight, the winding drum 2 is prevented from idling.

[0021]

As described in detail above, in the tape measure with a slip prevention mechanism of the present invention, the guides intersecting the outer circumference of the tape measure are extended from the lower side of the handle so as to face the inner wall surfaces of the two side plates. At the same time, the trochanter is loosely fitted between the guides, and the trochanter slides along the guide according to the size of the outer circumference of the tape measure by its own weight, and rotatably contacts the outer circumference of the tape. Since the tapes are brought into contact with each other, even if the size of the outer circumference of the tape is reduced due to the amount of the tape to be pulled out, the rotor slides along the guide due to its own weight while being in contact with the outer circumference of the tape. ,
A resistance force due to the weight of the trochanter is always applied to the outer circumference of the winding to prevent the winding cylinder from idling.

Further, in the tape measure with the anti-slip mechanism of the present invention, since the rotator is rotatably abutted on the outer circumference of the tape measure, the tape measure is not worn and damaged, and the spring is prevented. Since the elastic force of the tape is not used, the resistance force applied to the winding cylinder does not decrease, and the tape measure has excellent durability.

[Brief description of drawings]

FIG. 1 is a front view of a tape measure according to the present invention.

2 is a cross-sectional explanatory view showing the movement of a trochanter in the tape measure of FIG.

FIG. 3 is a perspective view of a trochanter.

FIG. 4 is a front view of the tape measure of FIG. 1 with a tape measure pulled out.

[Explanation of symbols]

 1 Case 11 Side plate 12 Handle 13 Tape entrance / exit 14 Guide 2 Winding cylinder 3 Tape measure tape 31 Winding circumference 4 Roller

Claims (1)

[Claims] 1. A case 1 comprising two side plates 11 opposed to each other, a handle 12 on the upper part and a tape port 13 on the lower part, and a rotatably mounted shaft between the two side plates 11. A tape measure comprising a take-up cylinder 2 and a long tape measure 3 wound around the take-up cylinder 2 so that it can be unwound freely. The tape measure 3 is applied to the inner wall surfaces of the two side plates 11 from below the handle 12. The guides 14 intersecting the winding outer circumference 31 are extended to face each other, and the trochanter 4 is loosely fitted between the guides 14, and the trochanter 4 has a size of the winding outer circumference 31 of the tape measure 3 by its own weight. A tape measure with a slip prevention mechanism adapted to slide along the guide 14 and rotatably contact the outer circumference 31 of the winding.