JPH0718018U - Bolt tightening tool - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a bolt tightening tool that can obtain manufacturing cost and simplicity in manufacturing. [Structure] Replace the spring washer 3 with the bolt head 1A (or nut).
Is interposed between the pressing surface 1B and the non-pressing surface 2A of the fastening object 2. A thick spacer 4 is interposed between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2, and the spring washer 3 is divided within the thickness range of the spacer 4. The tip portions 3a and 3b of the portion are in a free state, and the restoring force thereof is exerted to engage with the concave portions 1C and 2C of the pressing surface 1B and the non-pressing surface 2A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt tightening tool used as various machine elements, and more particularly, to an improvement of a bolt tightening tool for preventing loosening of various bolts such as through bolts, holding bolts, stud bolts or nut bolts.

[0002]

[Prior art]

 The bolts are prevented from loosening by means such as spring washers, rubber washers, or bite-type spring washers.The tightening action is to urge the screw threads to engage in opposite directions by tightening reaction force. However, increasing the friction between the two threads prevents the screws from loosening. When this type of spring washer is used, when tightening the bolt or nut, a large frictional force can be applied to the threads that are screwed together by the force that the increased spring washer tries to restore, preventing the bolt or nut from loosening. However, once a slight loosening occurs due to vibration etc., there is a gap in which the spring washer can be elastically displaced, so that rather the elastic restoring force rather acts to promote the loosening, and as a result, the bolt Or the situation where the connection of the nut was disconnected was reached.

Therefore, in order to solve the problems of the prior art, the present inventor has proposed a bolt tightening tool in Japanese Patent Application No. 3-132323. As shown in FIGS. 8 and 9, this bolt tightening tool is a bolt tightening tool interposed between the bolt head 1A or the nut and the object to be fastened 2, and is divided at one position in the circumferential direction. When not compressed, the split parts 3a and 3b are displaced in the axial direction X of the bolt 1 and formed into a flat ring shape when compressed, and on the upper surface 3c thereof that contacts the bolt head 1A or the nut. At least one spring washer 3 provided with at least one engaging projection 3d is interposed between the lower surface 3e of the spring washer 3 and the object 2 to be fastened, and the lower surface 4a corresponding to the object 2 to be fastened is at least It comprises a loosening prevention member 4 provided with one engaging projection 4b and at least one engaging recess 4d on an upper surface 4c thereof which abuts a lower surface 3e of the spring washer 3. When relaxing Serial split ends 3a displaced downward spring washer 3 is inserted engages the bolt 1 or in the recess 4d is one that is configured to prevent rotation of the loosening direction of the nut.

Thereby, for example, between the bolt head 1A and the object 2 to be fastened, the spring washer 3 is positioned on the upper side, the relaxation preventing member 4 is positioned on the lower side, and the bolt head 1A is rotated by a spanner. Then, the engaging projection 3d on the upper surface 3c of the spring washer 3 contacts the lower surface of the bolt head 1A, and the engaging projection 4b on the lower surface 4a of the loosening prevention member 4 contacts the fastening object 2. Since the spring washer 3 having no engaging projection and the loosening prevention member 4 are tightened while causing a slip, the projection 3d on the upper surface 3c of the spring washer 3 and the lower surface of the bolt head 1A and the loosening prevention member 4. The engagement protrusion 4b of the member 4 and the fastening target object 2 are pressed in the vertical direction (in the axial direction of the bolt) without slipping (point contact), and bite in the fitted state can be obtained. .

Therefore, relative rotation between the bolt 1 and the spring washer 3 and between the loosening prevention member 4 and the fastening object 2 is prevented. After that, when the bolt 1 is slightly loosened, a slight gap is also generated between the spring washer 3 and the loosening prevention member 4, but this causes the spring washer 3 to be divided. The parts 3a and 3b are slightly displaced in the axial direction X of the bolt 1 due to the restoring force, and the divided part 3a displaced downward is fitted into the engagement recess 4d of the relaxation preventing member 4. As a result, the loosening prevention member 4 receives and prevents the shifted divided portion 3a from further turning. At this time, in the case where the number of the engaging concave portions 4d is one, when the bolt 1 is initially tightened, it depends on how much the circumferential position is displaced with respect to the divided portion 3a. It may not be possible to immediately engage the engaging recess 4d when the bolt 1 is loosened, but the engagement between the two is obtained within at least one rotation. Thus, the relative slip between the spring washer 3 and the loosening prevention member 4 in the loosening direction is prevented, and as a result, the loosening of the bolt 1 is prevented.

[0006]

However, the above-mentioned invention proposed by the present inventor has a remarkable effect that the loosening of the bolt 1 can be prevented, but the upper surface 3c of the spring washer 3 has the above-mentioned effect. Since the projection 3d is provided, the spring washer 3 must be manufactured as a special one. Therefore, since spring steel is used in addition to increasing the manufacturing cost of the spring washer 3, it is necessary to heat-treat only the protrusion 3d formed thereon to make it relatively hard. Since it is necessary to perform a local heat treatment while maintaining the elasticity as a whole, there were difficulties in manufacturing.

It is an object of the present invention to improve the above-mentioned prior invention and to provide a bolt tightening tool which can obtain manufacturing cost and manufacturing simplicity.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the bolt tightening tool according to the present invention is configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed. The spring washer 3 is interposed between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 and the pressing surface 1B of the bolt head 1A (or nut). The non-pressing surface 2A of the fastening object 2 is provided with recesses 1C and 2C, respectively, into which the tip portions 3a and 3b of the divided portion of the spring washer 3 can be engaged.

The bolt tightening tool according to a second aspect of the invention includes a spring washer 3 configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed. A spacer 4 is provided between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2, and the thickness of the spacer 4 is set to be smaller than the thickness of the spring washer 3 when compressed. Also, the tip end portions 3a and 3b of the divided portion of the spring washer 3 can be engaged with the pressing surface 1B of the bolt head 1 (or nut) and the non-pressing surface 2A of the tightening / fastening object 2. I did.

Further, the bolt tightening tool according to a third aspect of the invention includes a spring washer 3 configured such that the divided portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed, and a bolt. A spacer 4 is provided between the pressing surface 1B of the head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 and the thickness of the spacer 4 is set to be smaller than the thickness of the spring washer 3 when compressed. A recess 1C that is also thick and that can be engaged with the pressing surface 1B of the bolt head 1 (or nut) and the non-pressing surface 2A of the object 2 to be fastened by the tip portions 3a and 3b of the divided portion of the spring washer 3.・ 2C was formed.

Further, the bolt tightening tool of the fourth aspect is interposed between the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2 and contracts at least in the axial direction X of the bolt 1 during compression. And a spacer 4 interposed between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2, The spacer has a thickness of 4 smaller than the non-compressed thickness of the tubular body 5, and the restoring force of the tubular body 5 is set to the pressing surface 1B of the bolt head 1A (or nut) and the fastening target object. It is configured to act on the two non-pressing surfaces 2A.

Further, the bolt tightening tool of claim 5 is interposed between the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2 and contracts at least in the axial direction X of the bolt 1 during compression. And a spacer 4 interposed between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2, The spacer has a thickness of 4 smaller than the thickness of the cylindrical body 5 when not compressed, and the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 are The concave portions 1C and 2C are formed so that the deformed portions of the tubular body 5 can be engaged.

According to the sixth aspect of the present invention, in the bolt tightening tool, the spring washer 3 configured such that the divided portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed, The flat plate washer 6 is interposed between the pressing surface 1B of the head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 and between the spring washer 3 and the non-pressing surface 2A of the fastening object 2. And the recesses 6A and 1C into which the tip portions 3a and 3b of the split portion of the spring washer 3 can be engaged with the upper surface of the flat plate washer 6 and the pressing surface 1B of the bolt head 1A (or nut), respectively. At least one projection 6B which is formed on each of the flat plate washers 6 and engages with the non-pressing surface 2A of the fastening object 2 is provided on the lower surface of the flat plate washer 6.

According to a sixth aspect of the present invention, in the bolt tightening tool, the spring washer 3 is configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed. The flat plate washer 6 is interposed between the pressing surface 1B of the head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 and between the spring washer 3 and the non-pressing surface 2A of the fastening object 2. And the recesses 6A and 1C into which the tip portions 3a and 3b of the split portion of the spring washer 3 can be engaged with the upper surface of the flat plate washer 6 and the pressing surface 1B of the bolt head 1A (or nut), respectively. The flat plate washer 6 is provided with at least one projection 6B on the lower surface of the flat plate washer 6 that engages with the recess 2C formed on the non-pressing surface 2A of the fastening object 2.

The spacer 4 referred to in each of the above claims may be a plain washer or a spring washer.

[0016]

[Action]

 According to the bolt tightening device of the first aspect of the present invention, as shown in FIGS. 1 and 2, if the bolt head 1A and the object to be fastened 2 are pressed via the spring washer 3. When the spring washer 3 is compressed and the tightening is released at the final tightening position (Fig. 2), the tip parts 3a and 3b of the divided parts try to restore each other up and down, and at the slightly loosened position, The concave portion 1C of the pressing surface 1B of the bolt head 1A (or nut) and the concave portion 2C formed on the non-pressing surface 2A of the fastening object 2 are engaged with each other to prevent further loosening.

3 and 4 also basically exhibit the same function as in FIGS. 1 and 2, but here, the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing of the fastening target object 2 are performed. A spacer 4 (a flat washer, but a spring washer may be used) interposed between the surface 2A and the surface 2A, and the spacer 4 is thicker than the compressed thickness of the spring washer 3; The tightening pressure is received by the upper surface of the spacer 4, and the tip portions 3a and 3b of the divided portion of the spring washer 3 thinner than the spacer 4 have a margin to restore each other up and down. (Or nut) Pressing surface 1B and fastening The non-pressing surface 2A of the object 2 is engaged to prevent the bolt from loosening.

In this case, if recesses 1C and 2C are formed on the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2, respectively, the tip of the divided portion of the spring washer 3 will be described. The parts 3a and 3b are reliably performed.

5 and 6 also basically exhibit the same function as in FIGS. 3 and 4, but here, the spring washer 3 is used to press the pressing surface 1B of the bolt head 1A and the object to be fastened. It is interposed between the two non-pressing surfaces 2A and is replaced with a tubular body 5 made of an elastic material that contracts at least in the axial direction X of the bolt 1 at the time of compression. The pressing force exerted on the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2 can prevent the bolt from loosening.

In this case, when concave portions 1C and 2C are formed on the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2, respectively, elastic displacement of the tubular body 5 is caused. As a result, engagement with the recesses 1C and 2C is performed, and it is possible to more reliably prevent loosening of the bolt.

Further, FIG. 7 also basically exhibits the same function as that of FIGS. 1 and 2, but here, between the spring washer 3 and the non-pressing surface 2 A of the fastening target object 2. The flat plate washer 6 is interposed so that the spring washer 3 is engaged with the fastening object 2 via the flat plate washer 6.

In this case, if the recess 2C is formed on the non-pressing surface 2A of the object 2 to be fastened, the projection 6B of the flat plate washer 6 is surely engaged with the recess 2C and the bolt is prevented from loosening. Can be performed more reliably.

[0023]

【Example】

 A preferred embodiment of the bolt tightening device of the present invention will be described in detail below with reference to FIGS.

FIGS. 1 and 2 show a first embodiment, which is interposed between a bolt head 1A of a holding bolt 1 (which is a nut in the case of a planting bolt) and an object 2 to be fastened. If so, explain the bolt tightening tool. Reference numeral 3 is a spring washer, which is divided at one position in the circumferential direction, so that the tip portions 3a and 3b of the divided portion are displaced in the axial direction X of the bolt 1 when not compressed and have a flat ring shape when compressed. Is configured.

The spring washer 3 is interposed between the pressing surface 1 B of the bolt head 1 A and the non-pressing surface 2 A of the fastening object 2, and the pressing surface 1 B of the bolt head 1 A and the fastening object 2 are connected. The non-pressing surface 2A is provided with recesses 1C and 2C, respectively, into which the tip ends 3a and 3b of the divided portion of the spring washer 3 can be engaged. The recesses 1C and 2C have a groove shape and are formed in a chrysanthemum shape in a plan view, but the intervals and the number of the grooves may be set appropriately.

FIG. 3 and FIG. 4 show a second embodiment, and a bolt tightening tool when it is interposed between the bolt head 1A of the similar holding bolt 1 and the fastening object 2 will be described. Reference numeral 3 is a spring washer, which is divided at one position in the circumferential direction, so that the tip portions 3a and 3b of the divided portion are displaced in the axial direction X of the bolt 1 when not compressed and have a flat ring shape when compressed. It is configured.

A spacer 4 is provided between the spring washer 3, the pressing surface 1 B of the bolt head 1 A (or nut) and the non-pressing surface 2 A of the fastening object 2. The spacer has a thickness of 4 that is thicker than the thickness of the spring washer 3 when compressed, and the tip portions 3a and 3b of the divided portions of the spring washer 3 do not contact the pressing surface 1B of the bolt head 1 and the fastening object 2. It is configured so that it can be engaged with the pressing surface 2A. Then, the pressing surface 1B of the bolt head 1 (or nut) and the non-pressing surface 2A of the object 2 to be fastened are formed with recesses 1C and 2C with which the tip ends 3a and 3b of the divided portion of the spring washer 3 can be engaged. There is.

FIG. 5 and FIG. 6 show a third embodiment, in which the bolt head 1A is interposed between the pressing surface 1B and the non-pressing surface 2A of the fastening object 2 and at least the bolt 1 is pressed at the time of compression. A cylindrical body 5 made of an elastic material that contracts in the axial direction X is provided. Further, a spacer 4 is provided between the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2, and the thickness of the spacer 4 is the thickness of the cylindrical body 5 when it is not compressed. It is made thinner. The restoring force of the tubular body 5 is configured to act on the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening target 2. Further, the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2 are formed with recesses 1C and 2C with which the deformed portion of the tubular body 5 can be engaged.

FIG. 7 shows a fourth embodiment, in which a split washer is displaced in the axial direction X of the bolt 1 when uncompressed and has a substantially flat ring shape when compressed. 3 is interposed between the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2. A flat plate washer 6 is interposed between the spring washer 3 and the non-pressing surface 2A of the fastening object 2, and the spring washer is attached to the upper surface of the flat plate washer 6 and the pressing surface 1B of the bolt head 1A. Recesses 6A and 1C that can be engaged with the front end portions 3a and 3b of the divided portion 3 are formed respectively. Further, a plurality of protrusions 6B that engage with the recesses 2C formed in the non-pressing surface 2A of the fastening target 2 are provided on the lower surface of the flat plate washer 6.

[0030]

[Effect of device]

 According to the present invention, it is possible to provide a bolt tightening tool having the anti-loosening effect of the prior application while using a normal vane washer, and it is difficult to provide a protrusion for engagement on the spring washer. Compared with the structure, there is an advantage that the manufacturing cost can be drastically reduced. Further, by providing a recess on the pressing surface of the bolt head or the nut, and by providing a similar recess on the non-pressing surface of the fastening object, the function of preventing the bolt from loosening can be further enhanced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment of a bolt tightening tool according to the present invention.

FIG. 2 is a vertical sectional side view of the first embodiment of the bolt tightening tool according to the present invention when tightening.

FIG. 3 is a vertical sectional side view of a second embodiment of the bolt tightening tool according to the present invention.

FIG. 4 is a vertical sectional side view of a bolt tightening tool according to a second embodiment of the present invention when tightening.

FIG. 5 is a vertical sectional side view of a third embodiment of the bolt tightening tool according to the present invention.

FIG. 6 is a vertical sectional side view of a third embodiment of the bolt tightening tool according to the present invention when tightening.

FIG. 7 is a vertical sectional side view of a bolt tightening tool according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view of a bolt tightening tool according to the related art.

FIG. 9 is a vertical sectional side view of a bolt tightening tool according to the related art.

[Explanation of symbols]

 1 Bolt 1A Bolt head 1B Bolt pressing surface 2 Fastening object 3 Spring washer 3a Tip of spring washer 3b Another tip of spring washer 4 Spacer

Claims (7)

[Scope of utility model registration request] 1. A spring washer 3 configured such that a split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed, and a pressing surface of a bolt head 1A (or a nut). 1B and the non-pressing surface 2A of the fastening object 2 and the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 of the spring washer 3 A bolt tightening tool in which concave portions 1C and 2C, respectively, which can be engaged with the tip portions 3a and 3b of the divided portions are formed. 2. A spring washer 3 configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed, and a pressing surface of the bolt head 1A (or nut). 1B and a spacer 4 interposed between the non-pressing surface 2A of the object 2 to be fastened, and the thickness of the spacer 4 is made thicker than the thickness of the spring washer 3 at the time of compression. A bolt tightening tool configured such that the tip portions 3a and 3b of the divided portion can be engaged with the pressing surface 1B of the bolt head 1 (or nut) and the non-pressing surface 2A of the fastening object 2. 3. A spring washer 3 configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed, and has a substantially flat ring shape when compressed, and a pressing surface of the bolt head 1A (or nut). 1B and a spacer 4 interposed between the non-pressing surface 2A of the object 2 to be fastened, the thickness of the spacer 4 is made thicker than the compressed thickness of the spring washer 3, and the bolt head 1 (or nut) pressing surface 1B
And concave portions 1C and 2C in which the tip end portions 3a and 3b of the divided portion of the spring washer 3 can engage with the non-pressing surface 2A of the fastening object 2.
A bolt tightening tool. 4. A tubular shape made of an elastic material which is interposed between the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2 and contracts at least in the axial direction X of the bolt 1 when compressed. A body 5 and a spacer 4 interposed between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 are provided. Configured to be thinner than the uncompressed thickness of 5,
A bolt tightening tool configured to act the restoring force of the tubular body 5 on the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2. 5. A tubular shape made of an elastic material that is interposed between the pressing surface 1B of the bolt head 1A and the non-pressing surface 2A of the fastening object 2 and contracts at least in the axial direction X of the bolt 1 when compressed. A body 5 and a spacer 4 interposed between the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 are provided. Configured to be thinner than the uncompressed thickness of 5,
In addition, a bolt tightening tool in which concave portions 1C and 2C are formed on the pressing surface 1B of the bolt head 1A (or nut) and the non-pressing surface 2A of the fastening object 2 so that the deformed portion of the tubular body 5 can be engaged. 6. A spring washer 3 configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed, is provided with a pressing surface of the bolt head 1A (or nut). 1B and the non-pressing surface 2A of the fastening object 2 and a flat plate washer 6 between the spring washer 3 and the non-pressing surface 2A of the fastening object 2, and the flat plate washer 6
Upper surface of the bolt head 1A (or nut) pressing surface 1B
Of the spring washer 3 into the respective tip portions 3a, 3
Recesses 6A and 1C that can be engaged with b are formed respectively, and the lower surface of the flat plate washer 6 has a non-pressing surface 2A of the fastening object 2.
A bolt tightener provided with at least one projection 6B for engaging with. 7. A spring washer 3 configured such that the split portion is displaced in the axial direction X of the bolt 1 when not compressed and has a substantially flat ring shape when compressed is provided on the pressing surface of the bolt head 1A (or nut). 1B and the non-pressing surface 2A of the fastening object 2 and a flat plate washer 6 between the spring washer 3 and the non-pressing surface 2A of the fastening object 2, and the flat plate washer 6
Upper surface of the bolt head 1A (or nut) pressing surface 1B
Of the spring washer 3 into the respective tip portions 3a, 3
Recesses 6A and 1C that can be engaged with b are formed respectively, and the lower surface of the flat plate washer 6 has a non-pressing surface 2A of the fastening object 2.
A bolt tightening tool provided with at least one projection 6B which engages with the recess 2C formed in the above.