JPH09229036A - Torque control metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable fastening of a bolt with a preset torque by use of a conventional tool by forming a metal fitting in the shape of belleville spring having a hole for insertion of screw and a tapered part, and providing the tapared part with a deformation part completing deformation when the preset torque is given to the screw. SOLUTION: A torque control metal fitting A is deformed at its bent piece 2 according to the torque given thereto and the foremost end of the piece 2 is enlarged when the torque is given after the foremost end of bent piece 2 is brought into contact with a fastened part and a bolt is inserted into a hole 3. After the completion of deformation of the bent piece 2, namely at the time of contact of bottom part 2a of the piece 2 with the fastened member, the bolt is fastened with the preset torque. For confirming the deformation of the piece 2 a mark 4 is put in the vicinity of the bottom part 2a of the bent piece 2 so that the fastening and inspection work of bolt is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque management fitting for managing a tightening torque to be applied to an object when it is fastened with a screw such as a bolt or a wood screw.

[0002]

[Prior art]

It is quite common to fasten an object using a screw such as a bolt, a wood screw or a screw (hereinafter, typically referred to as "bolt"). When fastening an object to be fastened using a bolt, it is required to tighten the bolt with an appropriate torque so as not to apply an excessive force or loosen the bolt.

Particularly, when the object to be fastened is an extruded cement plate having brittleness and the cement plate is attached to a building frame by using bolts and plate-shaped nuts, if the bolts are tightened with excessive torque, Excessive compressive force may act on the extruded cement plate to cause cracks in the cement plate. Further, if tightened with an excessively small torque, the extrusion cement plate may deviate from a predetermined mounting position or the preset mounting strength may not be exhibited.

When it is necessary to strictly control the torque when tightening the bolt, the tightening work is performed by using a tool (for example, a torque wrench) that releases the torque when a torque equal to or more than a preset value is applied. Bolts with torque limit function (for example,
Is generally used.

On the other hand, there are provided washers such as a spring washer, a toothed washer, and a flat spring washer in order to prevent loosening by interposing between the bolt head or the nut and the object to be fastened. Among them, the countersunk toothed washer and the countersunk spring washer are each formed in a tapered shape, and the tapered portion elastically deforms to a flat state according to the torque acting on the bolt. The generated elastic force prevents the bolt from loosening.

[0007]

As described above, it is rational to use the torque wrench when it is necessary to strictly control the torque when tightening the bolt. But,
The torque wrench generally has a problem that the price is high, and at present, the tightening work is performed using a normal tool such as a ratchet wrench, a box wrench, or a spanner.

When inspecting a bolt tightened with a normal tool, it is impossible to judge the quality from the appearance, and it is judged by re-tightening an already tightened bolt with a torque wrench. That is, it is not easy to inspect whether the bolt is tightened with the proper torque.

[0009] At the site where the extruded cement plate is attached to the building frame, workers are trained on the work procedure for tightening bolts and work standards such as distribution of force during tightening. However, when controlling the torque when tightening the bolts using a normal tool, this operation is probably sensuous, and it is not easy to convince with the oral explanation.

When the bolts are tightened using the countersunk washer and the countersunk spring washer, each washer is used in a state of being elastically deformed until the countersunk shape becomes flat. That is, there is no idea that each of the washers manages an appropriate torque, and even when these washers are used, it is inevitable that excessive torque acts on the bolt. .

An object of the present invention is to provide a torque management fitting which can be tightened with a preset torque using an ordinary tool and which can be easily inspected or confirmed.

[0012]

Means for Solving the Problems In order to solve the above problems, a torque management fitting according to the present invention is formed in a flat spring shape having a hole through which a screw is inserted and a taper portion, and the taper portion is preliminarily formed on the screw. A deforming portion that completes the deformation when the set torque is applied is provided.

In the above torque management fitting, when a screw (hereinafter referred to as "bolt") is inserted into the hole and tightened, the deformed portion is deformed by the tightening, and when the deformation of the deformed portion is completed, the bolt is deformed in advance. Torque set according to the design conditions of the section is applied. When the torque is continuously applied after the deformation of the deformed portion is completed, the tapered portion starts to deform, and the force required for tightening the bolt is extremely increased. Therefore,
The bolt can be selectively tightened with a small torque according to the specifications of the deformed portion and a large torque according to the conditions of the tapered portion.

In particular, by setting the specification of the deformable portion in correspondence with the torque to be applied to the bolt, it is possible to detect the change in the torque during the tightening work of the bolt so that the proper torque is applied to the bolt. You can know Then, when the deformation of the deformable portion is completed, the torque management fitting exerts a function as a flat spring, and an axial force is applied to the bolt to prevent loosening.

In the above-mentioned torque management fitting, the deformed portion may be a plurality of refraction pieces that refract in response to the torque applied to the bolt, and the refraction pieces are formed on the outer peripheral side of the tapered portion. preferable.

In the torque management fitting constructed as described above, the torque value at the time of tightening is set to a desired value by appropriately setting design conditions such as the material, thickness, width, length and number of the refraction piece. Can be set to

In the above torque management fitting, a mark for confirming the amount of deformation of the refraction piece is provided near the base of the refraction piece,
Alternatively, a hole through which a bolt is inserted is formed in the center, and an outer diameter that is sufficiently larger than the outer diameter of the taper portion is provided, and a mark that serves as a guide for the tip position of the refraction piece when the refraction piece is bent is provided on the surface. It is preferable to use flat washers.

In the torque management fitting constructed as described above, tightening torque is applied to the bolt while observing the deformed state of the bending piece so that the bending piece reaches a predetermined amount of deformation corresponding to the mark, so that the bending piece is properly adjusted. It can be tightened with various torques. Therefore, the inspection or confirmation can be easily performed by associating the deformation amount of the refraction piece with the mark.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the torque management fitting will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the structure of a torque management metal fitting, FIG. 2 is a diagram for explaining a state in which an object to be fastened is tightened using a torque management metal fitting having a mark on the base of a bending piece, and FIG. FIG. 4 is a diagram for explaining a combination with a plain washer provided with FIG. 4, FIG. 4 is a diagram for explaining an application example when the extruded cement plate is attached to a building frame, and FIG. 5 is an enlarged diagram of a main part of FIG.

In FIG. 1, the torque management fitting A is formed in a flat spring shape having a tapered portion 1, and the tapered portion 1 has a rectangular shape which is a deformed portion which is deformed in accordance with the applied torque. A refraction piece 2 is formed, and a hole 3 for inserting a bolt is formed at the center. Therefore, when the bending piece 2 is brought into contact with the object to be fastened and the bolt is inserted into the hole 3 and the bolt is torqued to be tightened, the bending piece 2 is bent and deformed, and when the bending piece 2 is completely deformed. , The bolt is tightened with a preset torque.

The torque control metal fitting A is made of a steel plate, preferably a spring steel plate, a phosphor bronze plate or the like having a spring property and is formed into a preset disc shape, and the diameter of the bolt to be applied to the center of the disc is set. By forming the refraction piece 2 in the corresponding hole 3 and the outer peripheral portion and further forming the taper portion 1 by press-molding this disc, the whole is formed in a flat spring shape.

The taper angle of the taper portion 1 is not particularly limited. However, it is preferable to set the taper angle to an obtuse angle so that the outer peripheral portion of the tapered portion 1 has a dimension sufficiently larger than the dimension of the head portion of the bolt.

The length of the refraction piece 2 is set to have a value smaller than the length of the slope of the taper portion 1, and a base portion 2a is formed in the middle of each taper portion 1. Therefore, the taper portion 1 is a continuous taper portion 1 formed of a slope continuous to the center side.
a is formed, and a discontinuous portion formed by the refraction piece 2 is formed on the outer peripheral side.

The refraction piece 2 is constructed as a cantilever, and specifications such as the thickness and width of the base portion 2a and the length and number of the refraction piece 2 are set according to the torque to be controlled at the design stage.
Therefore, by appropriately setting the design conditions, the refraction piece 2
It is possible to control the torque to be applied to the bolt by setting the force required to bend and deform the bolt.

In the torque control fitting A constructed as described above, the tip of the bending piece 2 is brought into contact with the object to be fastened and the hole 3 is formed.
When a torque is applied by inserting a bolt into, the bending piece 2 is deformed according to the applied torque, and the tip diameter of the piece 2 increases. Then, when the deformation of the bending piece 2 is completed, that is, when the base portion 2a of the bending piece 2 contacts the material to be fastened, the bolt is tightened by a preset torque.

When the bolt is further tightened after the deformation of the refraction piece 2 is completed, the force associated with the tightening at this time is applied to the continuous taper portion 1a to deform the taper portion 1a. The force required to deform the continuous taper portion 1a is extremely larger than the force required to deform the refraction piece 2. That is,
The torque required to deform the bending piece 2 is a value set in advance in the design stage, and this value is sufficiently smaller than the torque that deforms the continuous taper portion 1a. Therefore, it is sufficient for the operator to feel a clear change, and it is possible to control the torque when tightening the bolt.

By constructing the torque management metal fitting A as described above, it is possible to control the torque when tightening the bolt, and to confirm the deformed state of the bending piece 2 even when inspecting the already tightened bolt. By doing so, it is possible to determine the appearance.

However, in order to more easily perform the bolt tightening work and the inspection work, a mark 4 is provided near the base portion 2a of the refraction piece 2 as a guide for confirming the deformed state of the refraction piece 2. Has been. The mark 4 serves as a guide for the amount of deformation of the refraction piece 2 that accompanies tightening of the bolt, and it is necessary that the mark 4 can be easily visually recognized by the worker who is performing the bolt tightening work and the work management staff. Therefore, the mark 4 is constituted by a line having a color different from that of the continuous taper portion 1a, or a boundary line that colors the continuous taper portion 1a and the refraction piece 2 by color.

The mark serving as a guide for the amount of deformation of the refraction piece 2 does not necessarily have to be a line formed on the base portion 2a of the refraction piece 2, and the flat washer 5 may be provided with the mark 4 as shown in FIG. Alternatively, the outer diameter of the flat washer 5 may be set as a guide.

Providing the mark 4 on the flat washer 5 or using the outer diameter as a guide is to focus on the fact that the tip diameter of the refraction piece 2 increases as the refraction piece 2 deforms. When the set torque is applied, the tip of the bending piece 2 that is deformed by tightening the bolt 6 reaches the mark 4 or can match the outer diameter.

Next, as shown in FIG. 2, a case will be described in which, for example, two fastening plates 8 are fastened by the torque management fitting A, the bolts 6, and the nut 7. Torque management bracket A
Are always oriented in a direction visible to the operator. That is, depending on whether the worker tightens the bolt 6 or the nut 7, the torque management metal fitting A is located between the head portion 6 a of the bolt 6 and the fastening plate 8 or in the nut 7 depending on whether the worker tightens the nut 7. And the fastening plate 8 and the tip of the bending piece 2 is in contact with the fastening plate 8.

The figure shows a state in which the fastening plate 8 is fastened by tightening the bolt 6. Therefore, when the ratchet wrench socket is fitted and tightened on the head 6a of the bolt in the state of FIG. 7A, the bending piece 2 of the torque management metal fitting A is accompanied by the tightening as shown in FIG.
Is deformed, and the mark 4 approaches the surface of the fastening plate 8. When the ratchet wrench is subsequently operated to tighten the bolt 6 and the torque reaches a preset value, the deformation of the bending piece 2 is completed, and the base 2a and the mark 4 are substantially in contact with the surface of the fastening plate 8. The worker can manage the torque of the bolt 6 by checking the above-mentioned state and stopping the tightening work.

Therefore, when inspecting whether or not the bolt 6 is tightened with an appropriate torque, whether or not the mark 4 of the torque management metal fitting A is substantially in contact with the surface of the fastening plate 8 by the inspector. It is only necessary to check whether or not the number of bolts 6 is large, and it is possible to inspect very easily.

Even when the flat washer 5 is provided with the mark 4 as shown in FIG. 3, the bending piece 2 is deformed as the bolt 6 is tightened, and the tip of the piece 2 is deformed as described above. The diameter of the portion expands and approaches the mark 4. Then, when the torque reaches a preset value, the deformation of the refraction piece 2 is completed, and the tip end substantially coincides with the mark 4. By checking this state and stopping the tightening work, the torque of the bolt 6 can be managed.

Further, when the bolt 6 already tightened is inspected, the tip of the refraction piece 2 is marked with the mark 4 in the same manner as described above.
It is possible to easily carry out the inspection by confirming whether or not the position coincides with.

Next, a torque management metal fitting B having a different shape will be described with reference to FIGS. 4 and 5, and an application example of the metal fitting B when the extrusion cement plate is attached to a building frame will be described. In the drawings, the same parts as those of the above-mentioned torque management fitting A and parts having the same functions are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, the torque management fitting B is
Although the bending piece 2 is formed in a substantially triangular shape, the thickness and width of the base portion 2a, which are design conditions for the bending piece 2, and the length and number of the bending piece 2 are the same as those of the torque management fitting A. Is set according to the torque to tighten. That is, regardless of whether the refraction piece 2 has a rectangular shape or a triangular shape,
It is possible to manage the torque set according to the specifications of the refraction piece 2.

As shown in FIG. 4, the extrusion cement plate 10 is formed with a plurality of holes 10a in the longitudinal direction.
A plate-shaped nut 7 is inserted into the inside of the. Further, the building frame 11 is configured to have a pillar 11a and an angle-shaped mounting member 12 arranged along the pillar 11a and fixed to the pillar 11a.

The extrusion cement plate 10 has bolts 6 and nuts 7
The Z hardware 13 formed into a Z shape is attached by
Indoor surface of the piece 13a of this Z hardware 13 and the extrusion cement plate 10
The cement plate 10 is attached to the building frame 10 by sandwiching the piece 12a of the attachment member 12 with 10b.

The extruded cement plate 10 is attached to the building frame 11 by an operator tightening the bolt 6. That is, the washer 14 is arranged in the long hole 13c formed in the piece 13b of the Z metal piece 13 and the torque management metal fitting B is arranged, and the bolt 6 is formed in the hole 3 formed in the torque management metal fitting B and the surface 10b of the extrusion cement plate 10. It is inserted into the hole (not shown) formed in the above and is screwed into the nut 7 to be temporarily fixed.

Thereafter, the worker tightens the bolt 6 by fitting and rotating the ratchet wrench socket to the head 6a of the bolt from the indoor side. The refraction piece 2 is deformed by this tightening, and the mark 4 approaches the washer 14. Then, when the worker confirms that the mark 4 is substantially in contact with the washer 14 and stops the work, the bolt 6 is tightened with a torque according to the preset specification of the bending piece 2.

When the bolt 6 is tightened through the elongated hole 13c as in this embodiment, the washer 14 is indispensable.
It is preferable to provide the mark 4 on the.

In each of the above examples, the base portion 2a of the refraction piece 2 is used.
Although the mark 4 provided in the above is described as a line having a color, the mark is not limited to this configuration, and for example, a ring-shaped groove may be formed. That is, the torque control metal fittings A and B are made of a material thicker than the thickness of the refraction piece 2 designed in advance, and the thickness of the material and the thickness of the refraction piece 2 are formed in the vicinity of the base 2a by a processing method such as pressing or cutting. The mark 4 may be formed by forming a groove having a depth corresponding to the difference.

[0044]

As described in detail above, in the torque management fitting according to the present invention, when the deformation of the deformed portion is completed, a small torque corresponding to the specification of the deformed portion can be applied to the bolt, and the deformed portion can be deformed. After the deformation of the part is completed, a large torque can be applied to tighten the bolt. Therefore, it is possible to select the torque preset in two steps and tighten the bolt using a normal tightening tool.

Further, the torque to be applied to the bolt can be set by appropriately setting the specifications of the material of the torque management fitting, the thickness and width of the base of the bending piece to be the deformed portion, and the length and number of the bending piece. Can be set and managed.

When a mark is provided on the base of the refraction piece or the flat washer as a guide for the deformation amount of the refraction piece, the worker confirms the mark while performing the work of tightening the bolt, and the mark is applied to the bolt. Torque can be controlled, and the quality of the tightened state can be determined by checking the position of the mark when inspecting the bolt after tightening. Therefore, the tightening work and the inspection work are facilitated, and the uniform work can be realized without causing the variation by the workers.

Further, since the torque management fitting itself is formed in the shape of a flat spring, an axial force acts on the bolt along with the deformation of the bending piece, and this force can prevent loosening. It is a thing.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a torque management fitting.

FIG. 2 is a diagram illustrating a state in which an object to be fastened is tightened using a torque management metal fitting having a mark on the base of a bending piece.

FIG. 3 is a diagram illustrating a combination of a torque management fitting and a plain washer provided with a mark.

FIG. 4 is a diagram illustrating an application example when the extruded cement plate is attached to a building frame.

FIG. 5 is an enlarged view of a main part of FIG. 4;

[Explanation of symbols]

 A, B Torque control metal fitting 1 Tapered part 1a Continuous taper part 2 Refraction piece 2a Base part 3 Hole 4 Mark 5 Plain washer 6 Bolt 6a Head 7 Nut 8 Fastening plate 10 Extrusion cement plate 11 Building frame 12 Mounting member 13 Z metal object 14 Washer

Claims (5)

[Claims] 1. A deformable portion which is formed in a flat spring shape having a hole for inserting a screw and a taper portion and which completes deformation when a preset torque is applied to the screw. A characteristic torque management fitting. 2. The torque management fitting according to claim 1, wherein the deformable portion is a plurality of bending pieces that bend according to the torque applied to the screw. 3. The torque management fitting according to claim 2, wherein the bending piece is formed on the outer peripheral side of the tapered portion. 4. The torque management fitting according to claim 2, wherein a mark for confirming a deformation amount of the bending piece is provided in the vicinity of the base of the bending piece. 5. A hole through which a bolt is inserted is formed at the center, has an outer diameter sufficiently larger than the outer diameter of the taper portion, and has a tip position of the refraction piece when the refraction piece is refracted on the surface. The torque management fitting according to claim 3, further comprising a flat washer provided with a mark as a guide.