JP5440990B1 - Screw tightening torque adjustment device - Google Patents

Abstract

Provided is a screw tightening torque adjusting device capable of obtaining a predetermined tightening torque with little variation.
Clutch means provided in a screw tightening torque adjusting device includes a base, a circular recess formed at a position where a center line of the base is concentric, and a bearing in the recess. A drum inserted in a freely rotatable manner, a mounting portion where the rotating portion of the tool is detachably mounted by pressing the drum and the rotating portion of the screw tightening tool is detachably mounted on the screw A connecting portion that is detachably attached to the socket, and the clutch means comprises a holding bolt screwed into a screw hole drilled in the base, and the tip of the holding bolt is a peripheral drum of the drum The clutch means is actuated by tightening a screw with the screw tightening tool until the tip of the holding bolt slides on the drum of the drum.
[Selection] Figure 2

Description

The present invention relates to a screw tightening torque adjusting device that is detachably attached to a commercially available torque wrench, a wrench such as a ratchet wrench, or a screw tightening tool such as a spanner.

Conventionally, a socket for tightening is attached to a commercially available torque wrench, wrench such as a ratchet wrench, or a screw tightening tool such as a spanner, and bolts and nuts are tightened using a screw tightening tool such as a wrench or spanner. When the handle is turned, the operation to stop the rotation of the handle with the force applied is not stable at the moment when the specified tightening torque is approached. There is a risk of damage to the parts and breakage of the screw in use, and if the tightening is loose, the screw may be loosened during use.

In addition, when these screw tightening tools are equipped with a meter, memory, and gauge, the tightening operation and the rotation operation of the handle must be stopped while looking at the meter, etc. And a problem that a predetermined tightening torque cannot be obtained.

In the torque wrench shown in Patent Document 1, engagement teeth are formed on the upper clutch plate 52 and the lower clutch plate 51, respectively, and the upper clutch plate 52 is pressed against the lower clutch plate 51 by the leaf spring 11. However, the screw is tightened with a torque required when the engaging teeth 51a of the lower clutch plate 51 get over the engaging teeth 52b of the upper clutch plate 52, and the lower clutch plate 51 is engaged. The friction generated between the teeth 51a and the engaging teeth 52b of the upper clutch plate 52 is due to surface contact, and even if the pressing force by the leaf spring 11 is constant, it depends on the contact area and surface roughness of the surface contact. The torque required when the engaging tooth 51a of the lower clutch plate 51 gets over the engaging tooth 52b of the upper clutch plate 52 is greatly varied, and a predetermined tightening torque cannot be obtained. There is a problem, and this variation also varies greatly depending on the speed at which the torque wrench is operated and the force applied when operating the torque wrench, and the performance of the engine and other devices tightened using such a torque wrench is stable. The problem of not happening.

JP 2001-179650 A

The present invention solves the above-described conventional problems, and provides a screw tightening torque adjusting device that provides a predetermined tightening torque with little variation in screw tightening torque.

In order to solve the above-described problem, a screw tightening torque adjusting device according to the present invention includes a base, a circular recess formed at a position where the center line of the base is concentric, and a bearing in the recess. And a clutch means for preventing the drum from rotating until a predetermined rotational force is applied to the drum from the rotating portion of the screw tightening tool by pressing the drum. A mounting portion that is formed at a position that is concentric with the center line of the base, and the rotating portion of the screw tightening tool is detachably mounted; and a connecting portion that is detachably mounted on a socket that is detachably mounted on the screw; The clutch means comprises a holding bolt screwed into a screw hole drilled in the base, and the tip of the holding bolt presses the peripheral drum of the drum, and the tip of the holding bolt is Tighten the screw until it slides around the drum It said clutch means by tightening the screw, characterized in that activated by the tool.

The screw tightening torque adjusting device according to the present invention includes a base, a circular recess formed at a position where the center line of the base is concentric, and a pivot inserted into the recess via a bearing. And a clutch means for preventing the drum from rotating until a predetermined rotational force is applied to the drum from a rotating portion of the screw tightening tool by pressing the drum, and a center line of the base is concentric. The clutch means includes: a mounting portion that is formed at a position where the rotating portion of the screw tightening tool is detachably mounted; and a coupling portion that is detachably mounted on a socket that is detachably mounted on the screw. And a holding bolt screwed into a screw hole drilled in the base, and the tip of the holding bolt presses the drum drum, and the tip of the screw bolt slides on the drum drum. Tighten the screws with the screw tightening tool until Thus, the clutch means is operated, so that the screw can be tightened with a predetermined torque with little variation by simply tightening the screw with a screw tightening tool until the drum slides against the clutch means. There is an effect that it can be done, it is not necessary to stop the tightening work and the rotation operation of the handle while looking at the meter etc., the effect that the stability of the work is stabilized and the work efficiency is improved and even an unskilled amateur can screw There is an effect that the tightening work can be ensured.

The clutch means are provided at positions 120 degrees apart, the drum is a base, and the two clutch means can be prevented from rotating by three linear pressures, and the drum is securely held. Thus, there is an effect that variation in tightening torque can be further reduced.
The clutch means includes a holding bolt screwed into a screw hole drilled toward the center line of the base, and a swinging portion provided at the tip of the holding bolt, and a flat portion formed at a part of the tip. When the sphere is pressed against the drum of the drum, the plane portion is not reduced, and the sphere is in close contact with the drum of the drum.

Hereinafter, an example of the embodiment will be described in detail with reference to FIGS. 1 to 22. The screw tightening torque adjusting device 1 according to the present invention is configured such that the base 2 and the center line S of the base 2 are concentric. A circular recess 3 formed at a position, a drum 5 rotatably inserted into the recess 3 via a bearing 4, and a rotating portion 6 of the screw tightening tool K by pressing the drum 5 Clutch means 7 for preventing the drum 5 from rotating until a predetermined rotational force is applied to the drum 5 and the rotating portion 6 of the screw tightening tool K formed in a position concentric with the center line S of the base 2 are detachable. And a connecting portion 10 detachably attached to a socket 9 detachably attached to the screw N. The clutch means 7 is drilled toward the center line S of the base 2. The tip of the holding bolt 12 screwed into the provided screw hole 11 is pressed against the drum of the drum 5 and Is configured to operate by tightening the screw with a screw tightening tool to the tip of the pitch means 7 slips peripheral cylinder of the drum 5.

The base 2 is formed of a steel material in a columnar shape. Although the circumferential cylinder is formed in a circular shape, it may be formed in a hexagonal shape.

The recess 3 is formed on the base 2 with a bottom, and a ring-shaped bearing 4 made of a copper alloy, a commercially available metal material, and a commercially available dry bearing is press-fitted into the inner wall surface of the recess 3. The size of the base 2 is reduced and the drum 5 is smoothly rotated with a small force. The bearing 4 of the embodiment is formed in a connected ring shape. However, as shown in FIGS. 11 and 12, a part of the bearing 4 may be cut and easily inserted into the recess 3. .

The drum 5 is formed in a columnar shape, is inserted into the recess 3 so as to be flush with the base 2, and is formed so that the connecting portion 10 protrudes to a position where the center line P of the drum 5 is concentric. Has been. A drum body 5A in which the drum 5 is formed of a steel material in a columnar shape, and a ring 5B made of a high-grade material such as hard steel material or cemented carbide on the outer periphery of the drum body 5A are preferable because they are not easily damaged. The drum main body 5A and the ring 5B are prevented from slipping by welding or screws 5C. The connecting portion 10 is provided with a ball 10A protruding from the side surface of the connecting portion 10 and a spring body 10B that pushes the ball 10A outward.

The clutch means 7 is constituted by a holding bolt 12 screwed into a screw hole 11 drilled toward the center line S of the base 2. Hexagonal holes into which hexagonal wrench are attached are formed on the upper surface of the holding bolt 12 respectively. The clutch means 7 includes a first holding bolt 12A formed of a solid copper alloy shown in FIG. 17 and a second holding bolt 12A having a smaller diameter than the first holding bolt 12A formed of a pure copper alloy shown in FIG. A solid type consisting of a presser bolt 12B, a first presser bolt 12A in which a contact portion 12D made of a copper alloy is press-fitted into a screw 12C made of steel shown in FIG. 19, and a copper alloy to a screw 12C made of steel shown in FIG. A spherical body 12F is swingably attached to a press-fit type comprising a second presser bolt 12B having a diameter smaller than that of the first presser bolt 12A into which the contact portion 12D made of is pressed, and a screw 12E made of a steel material shown in FIG. The diameter of the first holding bolt 12A is smaller than that of the first holding bolt 12A in which a spherical body 12F is swingably attached to a screw 12E made of a steel material shown in FIG. Include the sphere type consists of two tap bolts 12B, it may be appropriately selected. The spherical body 12F may be appropriately selected from hard steel, copper alloy, and cemented carbide, and a flat portion 12G is formed at a part of the tip. The first presser bolts 12A are provided at positions 120 degrees apart, and the second presser bolts 12B are provided at positions 120 degrees apart.

The solid type and spherical type are also commercially available with coarse screws, but the press-fit type is a commercially available fine screw 12C made of steel and press-fitted with a contact portion 12D made of a copper alloy. Fine adjustment is possible. There is an effect that. The first presser bolts 12A and the second presser bolts 12B are alternately provided at positions separated by 60 degrees.

The clutch means 7 that are provided at positions 120 degrees apart are pressed by the presser bolts 12 evenly at the two locations by the two presser bolts 12 at an interval of 120 degrees. The other side is a line contact, which is a line contact corresponding to the length of the sliding contact between the drum 5 and the bearing 4 of the base 2, and is not a surface contact but a line contact, so that it becomes a sensitive clutch function. If the torque is set in advance with the holding bolt 12 and tightened with screws, the clutch slips when the set torque is reached, and there is an effect that a highly accurate torque with little variation with respect to the set value can be secured.

Even if the tip of the bolt 12 is made of a copper alloy such as phosphor bronze, brass or gun metal, the ring 5B of the drum 5 is hard and not damaged. When the sphere 12F is made of a hard material that is hard to wear, such as a hard steel material or cemented carbide, the sphere 12F can be prevented from being damaged. By providing the flat surface portion 12G, the spherical body 12F and the drum 5B are brought into surface contact close to line contact, so that the ring 5B of the drum 5 is not damaged and the variation in tightening torque is reduced.

In the embodiment, two clutch means 7 are provided at positions 120 degrees apart from each other, and the outer drum of the drum 5 is frictioned with the inner drum of the bearing 4 of the base 2 from the rotating part 6 of the screw tightening tool K. The drum 5 is prevented from rotating until a predetermined rotational force is applied to the drum 5, but by providing three clutch means 7 at positions 120 degrees apart from the rotating part 6 of the screw tightening tool K to the drum 5. The drum 5 may be prevented from rotating until a predetermined rotational force is applied. The clutch means 7 is composed of a holding bolt 12 screwed into a screw hole 11 drilled toward the center line S of the base 2 and presses the drum 5 with the tip of the holding bolt 12. The presser bolt 12 screwed into the screw hole 11 drilled in a direction slightly deviated from the direction toward the center line S of the base 2 may be used. The rotating part 6 is composed of a square pole, a bit, a hexagonal hole, a hexagonal wrench, and the like, and can be replaced freely. The drum 5 can be replaced if worn. M is a torque meter.

The minimum torque can be set by using the second presser bolt 12B, and the intermediate torque can be set by using the first presser bolt 12A. The first presser bolt 12A and the second presser bolt The maximum torque can be set by using 12B, and can be set in accordance with the diameter of the screw N. By using the second holding bolt 12B, the small diameter screw, the first By using the holding bolt 12A, it is possible to cope with the tightening operation of the medium-diameter screw and by using the first holding bolt 12A and the second holding bolt 12B.

The mounting portion 8 is inserted into a circular recess 15 formed at a position where the center line S of the base 2 is concentric, and in the screw hole 16 drilled toward the center line S of the base 2. It is attached in a state in which rotation is prevented by a screwed holding bolt 17.
The mounting portion 8 can be appropriately replaced if worn or damaged.

Next, a method of using the screw tightening torque adjusting device 1 will be described. Using a screw tightening tool K provided with a meter, a memory, and a gauge M, the torque that causes the clutch means 7 of the screw tightening torque adjusting device 1 to slide with respect to the drum 5 is tightened with the holding bolt 12 of the clutch means 7. By adjusting the attachment, it is adjusted to a predetermined torque. Thereafter, the rotating portion 6 of the screw tightening tool K is mounted on the mounting portion 8 of the screw tightening torque adjusting device 1. Thereafter, the connecting portion 10 of the screw tightening torque adjusting device 1 is inserted into the socket 9. Thereafter, the socket 9 is attached to the screw N, and the screw N is tightened by the screw tightening tool K. When a predetermined torque is reached, the tip of the clutch means 7 slides around the drum 5 and the screw N by the screw tightening tool K is removed. Tightening is complete.

In the first embodiment, the drum main body 5A and the ring 5B are formed separately, but may be integrally formed as in the second embodiment of the present invention shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a screw tightening tool using a torque wrench equipped with a screw tightening torque adjusting device of the present invention as an example. Sectional drawing of the tightening torque adjusting device of the screw of this invention. The left view of the tightening torque adjusting device of the screw of this invention. The right view of the screw tightening torque adjustment apparatus of this invention. Sectional drawing of the base of the screw tightening torque adjustment apparatus of this invention. The left view of the base of the screw tightening torque adjustment apparatus of this invention. Sectional drawing of the ring of the drum of the bolt tightening torque adjustment apparatus of this invention. The ring right side view of the drum of the bolt tightening torque adjusting device of the present invention. Sectional drawing of the bearing of the tightening torque adjusting device of the screw of this invention. The right view of the bearing of the screw tightening torque adjustment apparatus of this invention. Sectional drawing in the other Example of the bearing of the bolt tightening torque adjustment apparatus of this invention. The figure right-side view in the other Example of the bearing of the screw tightening torque adjustment apparatus of this invention. Sectional drawing of the drum main body of the screw tightening torque adjustment apparatus of this invention. The left view of the drum main body of the screw tightening torque adjustment apparatus of this invention. Sectional drawing of the mounting part of the screw tightening torque adjustment apparatus of this invention. The right view of the mounting part of the screw tightening torque adjustment apparatus of this invention. Sectional drawing of the solid type | mold of the 1st holding | suppression bolt of the bolt tightening torque adjustment apparatus of this invention. Sectional drawing of the solid type of the 2nd presser bolt of the screw tightening torque adjustment apparatus of this invention. Sectional drawing of the press-fitting type of the 1st holding | suppression bolt of the tightening torque adjusting device of the screw of this invention. Sectional drawing of the press-fit type of the 2nd presser bolt of the bolt tightening torque adjustment apparatus of this invention. Sectional drawing of the spherical body type of the 1st presser bolt of the tightening torque adjusting device of the screw of this invention. Sectional drawing of the spherical body type of the 2nd presser bolt of the bolt tightening torque adjustment apparatus of this invention. Sectional drawing of the screw tightening torque adjustment apparatus in 2nd Example of this invention.

DESCRIPTION OF SYMBOLS 1 Screw tightening torque adjustment device 2 Base 3 Recess 4 Bearing 5 Drum 6 Rotating part of screw tightening tool 7 Clutch means 8 Mounting part 9 Socket 10 Connecting part 11 Screw hole 12 Holding bolt

Claims (3)

A base, a circular recess formed at a position where the center line of the base is concentric, a drum rotatably inserted into the recess via a bearing, and pressing the drum to Clutch means for preventing rotation of the drum until a predetermined rotational force is applied to the drum from the rotating part of the screw tightening tool, and rotation of the screw tightening tool formed at a position concentric with the center line of the base And a connecting portion that is detachably attached to a socket that is detachably attached to the screw. The clutch means is provided in a screw hole formed in the base. It is composed of a screwed presser bolt, and the screw tightening tool tightens the screw until the tip of the presser bolt presses the drum drum and the tip of the screw bolt slides on the drum drum. The clutch means operates DOO tightening torque adjusting device of the screw according to claim. 2. The screw tightening torque adjusting device according to claim 1, wherein the clutch means are provided at positions 120 degrees apart from each other. 3. The screw tightening torque adjusting device according to claim 1, wherein the clutch means is provided at positions 120 degrees apart.