JPH0953621A - Fastening member with fastening display function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge a fastening condition with visual check, rapidly and surely by constitution which is simple and formed at low cost. SOLUTION: This device is provided with a fastening part 4 for rotation operating for screwing, and a display part 6 which is interposed between the fastening part 4 and a material 7 which is faced thereto. The display part 6 is pushed to the material 7 by the fastening part 4 which is rotating operated and screwed, push-press force is applied from both sides thereof, and thereby, it is deformed to be forced out from the fastening part 4 to a side. Or pressure having a constant level or more is applied, and thereby, a color thereof is changed so as to display generation of prescribed fastening force. Display by the display part 4 can be recognized by an operator side as clear as day.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly has a tightening display function relating to the improvement of screw parts which are widely used as a means for tightening objects such as parts to be mounted on a panel portion of household electric appliances and mechanical parts. The present invention relates to a fastening member.

[0002]

2. Description of the Related Art Conventionally, screw parts have been extremely widely used to fasten two or more objects. Fastening with these screw components is easy to install and remove, unlike rivets. Is a feature, most of which is a combination of bolts and nuts. A wrench is used for tightening bolts and nuts, and a screwdriver (driver) is used for small screws, but an electric tightening tool is generally used in the mass production process of products.

[0003]

By the way, when attaching parts or products, it is common to use a plurality of screw parts. In this case, first, all screw parts are temporarily fixed, and then, In order to fix in a well-balanced manner, a method of sequentially tightening a set of facing screw parts is adopted. In this case, the tightening of the plurality of screw parts is performed in a predetermined order.

However, since it is not possible to determine the screw parts by simply seeing whether or not the tightening has been completed, for example, when the tightening work is interrupted, it is complicated to check the states of the screw parts with fingers. Not only is this work necessary, but the tightening may be forgotten due to a relatively strong tightening at the time of temporary fixing or misunderstanding of the progress of the tightening work. Unexpected trouble may occur due to forgetting to tighten the screw parts. In particular, in recent years, the law is obliged to strictly check the tightened state of screw parts, and from this point also, a means for easily and surely checking the tightened state of screw parts is desired.

[0005]

In order to solve the above-mentioned problems, the first invention of the present application is a fastening member for connecting and fixing two or more objects to each other by screwing, and is for fastening the same. The tightening part is provided with a tightening part capable of performing a rotating operation and a display part interposed between the tightening part and an object facing the tightening part. It is characterized in that the generation of a predetermined tightening force is displayed by a display unit that is pressed against an object by the section and that is deformed or discolored to the side of the tightening section.

A second invention of the present application solves the above-mentioned problems, and in order to implement the configuration of the first invention with a small number of parts, the tightening portion is a bolt head of a bolt, and the display portion is It is characterized in that the soft resin is adhered to the seat surface of the bolt head in such a shape that it does not protrude laterally toward the periphery.

According to a third invention of the present application, in order to solve the above-mentioned problems and to carry out the construction of the first invention in a versatile manner, the display portion is made of an elastic material and is almost a bolt head or a nut. It is characterized in that it is formed in a ring shape having the same outer diameter and an inner diameter capable of inserting the screw portion.

[0008]

According to the first invention of the present application, when the tightening portion is rotated by a spanner or a screwdriver to be screwed in, the display portion is pressed against the object by the screwing tightening portion, and a predetermined When tightened until the tightening force is obtained, the display section
It deforms into a state in which it is crushed between the tightening portion and the object, and sticks out to the side of the tightening portion, or discolors when it receives a pressure of a certain pressure or more. By the protrusion or discoloration of the display portion, it is possible to immediately determine that the tightening is completed. Therefore, the tightening state of each of the plurality of fastening members can be visually recognized at a glance depending on the presence or absence of the protruding deformation or discoloration of the display part, which makes it difficult to check the tightening with fingers after the interruption of the tightening work or forget to tighten. It is possible to surely solve the conventional problems that may occur.

According to the second invention of the present application, since the display portion is formed by adhering the soft resin around the seating surface of the bolt head so as to be wound, it is possible to reduce the number of parts as an integral part and to reduce the number of existing parts. Since it can be handled in the same manner as the bolt, the workability of tightening is good, and since it can be obtained only by attaching the soft resin to the existing bolt, the manufacturing cost can be reduced.

According to the third invention of the present application, the display portion is separate from the main body composed of the tightening portion and the male screw portion, but has a form that can be handled like an existing O-ring or washer. Since the existing bolts and nuts are used as they are, it is only necessary to combine them with a separately manufactured display section, which also reduces the manufacturing cost and does not deteriorate the workability of tightening. Moreover, it has versatility that can be used to display the tightening force of the nut. Also,
The display unit may be either a display unit formed of a soft resin and utilizing deformation due to crushing, or a display unit formed of a pressure sensitive discoloration resin or a capsule resin and utilizing discoloration due to pressure.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.

FIG. 1 shows a fastening member 1 with a fastening display function according to a first embodiment of the present invention. (A) and (b) are a side view and a plan view of a temporarily fixed state, and (c). , (D) are a side view and a plan view of the tightened state.

In the figure, an existing bolt having a hexagonal hole 5 is used as it is as a main body portion 2, and a male screw portion 3 in which a male screw is engraved on the peripheral surface of a rod-shaped body and a rotation for screwing. An operation bolt head (tightening portion) 4 is integrally provided. The soft resin is attached to the back surface of the bolt head 4 which is the back surface and a part of the peripheral surface of the male threaded portion 3 which is close to the seat surface, and a predetermined tightening force is generated by the soft resin. A display portion 6 for displaying is formed.

Next, the operation of the fastening member 1 will be described with reference to FIG. The fastening member 1 is an integral part in which a display portion 6 is formed by attaching a soft resin to an existing hexagon socket head bolt, and can be handled in the same manner as an existing bolt. That is, as shown in (a), the two objects 7 and 8 to be connected and fixed are overlapped with the mounting holes 9 and the screw holes 10 aligned with each other, and the male screw portion 3 is attached to the mounting hole 9.
Lightly screw into the screw hole 10 via the to temporarily fix. In this temporarily fixed state, as shown in (b), the display portion 6 is hidden by the bolt head 4 and cannot be visually recognized from the operator side.

When temporarily tightening all the fastening members 1 and then tightening them in a predetermined order, the bolt head 4 is rotated by a tool to screw the male screw portion 3 into the screw hole 10, and the bolt head 4 is rotated. 6 sandwiched between the object and the object 7
Is squeezed from both sides by the bolt head 4 and the object 7 as the male screw portion 3 is screwed, and as shown in (c) and (d), protrudes toward the circumferential side of the bolt head 4. . here,
The display unit 6 is set so as to stick to the worker by setting the amount of protrusion so as to protrude into the states of (c) and (d) when a predetermined tightening force is generated between the objects 7 and 8 by the main body 2. From the side, as shown in (d), the portion of the display unit 6 that protrudes toward the circumferential side of the bolt head 4 can be visually recognized at a glance.
Therefore, the tightening state of all the fastening members 1 can be confirmed at a glance by the presence or absence of the protrusion of the display section 6 in any situation such as after the interruption of the tightening work, and it is complicated to check the tightening state one by one with a finger. You can eliminate unnecessary work and surely prevent forgetting to tighten.

In the above embodiment, the case where the display portion 6 is made of soft resin has been described.
Since it may be formed using a material that is deformed into a predetermined shape by applying a constant pressure, it may be formed using, for example, soft rubber or clay. In addition, the display unit 6
Is formed of a non-plastic material that is easily deformed by pressurization and generates an elastic force, the display portion 6 has both functions of displaying a tightening completion state by deformation and preventing loosening by a restoring force. Becomes

FIG. 2 shows a fastening member 11 according to a second embodiment of the present invention, in which (a) is a side view of a temporarily fixed state,
(B) is a side view of a tightened state.

In the figure, the fastening member 11 is substantially the same as the bolt head 14 due to a material having an elastic force and a main body 12 made of an existing bolt integrally provided with a male screw portion 13 and a bolt head 14. The display portion 16 is formed in a ring shape having an outer diameter and an inner diameter capable of inserting the male screw portion 13. That is, the fastening member 11 is
The existing bolt is used as it is, and the separately manufactured display unit 16 is combined with it. .

Next, the operation of the fastening member 11 will be described. The display unit 16 can be handled almost like an existing O-ring or flat washer. That is, as shown in (a), the display portion 16 is inserted through the male screw portion 13 and the main body portion 12 is temporarily fixed to the objects 7 and 8 to be connected and fixed. At this time, since the outer diameter of the display unit 16 is substantially the same as that of the bolt head 14, the display unit 16 cannot be visually recognized by the operator. Thereby, it can be confirmed that the tightened state is not achieved.

The bolt head 14 is rotated to operate the male screw portion 1.
3 is screwed into the screw hole 10 and tightened until a predetermined tightening force is generated between both members 7 and 8, the display portion 16
As shown in (b), is squeezed into a flat state from both sides by the bolt head 14 and the object 7, and sticks out laterally.
Therefore, from the operator's side, the display portion 16 protruding laterally from the bolt head 14 can be visually recognized at a glance,
The presence or absence of the protrusion of the display portion 16 in all the fastening members 11 can be confirmed at a glance. Therefore, it is not necessary to check the tightened state one by one with a finger, and it is possible to reliably prevent forgetting to tighten.

3A and 3B show a fastening member 21 according to a third embodiment of the present invention. FIG. 3A is a side view showing a state before temporary fixing, and FIG. 3B is a side view showing a fastening state. .

In the figure, the fastening member 21 is applied when the two objects 18, 19 are connected and fixed by the main body 12 made of a through bolt and the nut 17, and is used in the second embodiment. In addition to the main body 12 made of the same bolt and the ring-shaped display portion 16, a nut 17 is added. In this case, the display unit 16 is the nut 1
7 is formed in a ring shape having an outer diameter substantially the same as that of 7 and an inner diameter capable of inserting the male screw portion 13.

Next, the operation of the fastening member 21 will be described. As shown in (a), the male screw portion 1 of the main body portion 12
3 is inserted into the respective mounting holes 20 and 21 of both objects 18 and 19, and the display portion 1 is attached to the male screw portion 13 protruding from the object 19.
After inserting 6, the nut 17 is screwed in and temporarily fixed. In this temporarily fixed state, the display unit 16 cannot be visually recognized from the operator side, so it can be confirmed that the tightened state is not achieved.

When the nut 17 is rotated and screwed into the male screw portion 13 and is tightened until a predetermined tightening force is generated on both members 18 and 19, the display portion 16 displays the nut as shown in (b). It is squeezed into a flat state from both sides by the tightening surface 17 and the object 19 and sticks out laterally. Therefore, since the operator can visually recognize the display portion 16 protruding to the side of the circumference of the nut 17 at a glance, it is possible to reliably prevent forgetting to tighten.

In the second and third embodiments described above,
The case where the display portion 16 is formed by using a material having elasticity has been described. However, the pressure-sensitive color-changing resin or the pressure-sensitive color-changing paint that changes color when the display portion 16 receives a pressure of a certain amount or more, or If a ring-shaped capsule paint or the like that breaks and develops color when pressed is used as a forming material, a predetermined tightened state can be displayed by discoloring or coloring the display portion. In this case, the shape of the display portion does not have to correspond to the shapes of the bolt head 14 and the nut 17, so that the operator can view the bolts and nuts having different sizes from the operator side. Therefore, it is possible to obtain versatility in which a single type can be shared with various screw parts.

[0026]

As described above, according to the first invention of the present application, the display portion interposed between the tightening portion for the tightening operation and the object to be connected is provided on the side of the tightening portion in the temporarily fixed state. When the tightening part is tightened so that the specified tightening force can be obtained, the display part is crushed between the tightening part and the object and tightened. Since it is set so as to be deformed so as to protrude to the side of the portion or to be discolored, the tightened state of the plurality of fastening members can be discriminated at a glance by the presence or absence of protrusion or discoloration of the display portion. Therefore, it is possible to eliminate the conventional complicated work of confirming each tightening with a finger after the interruption of the tightening work, and it is possible to reliably solve the conventional problem that the tightening may be forgotten.

According to the second invention of the present application, since the soft resin is formed so as to be adhered so as to be wound around the seat surface of the bolt head and the adjacent portion of the male screw portion, the number of parts can be reduced as an integral part. At the same time, since it can be handled in the same manner as an existing bolt, the workability of tightening is good, and since it can be formed only by attaching the soft resin to the existing bolt, the manufacturing cost can be reduced.

According to the third invention of the present application, the display portion is separate from the main body composed of the tightening portion and the male screw portion, but has a form that can be handled like an existing O-ring or washer. Since the existing bolts and nuts are used as they are, it is only necessary to combine them with a separately manufactured display section, which reduces the manufacturing cost and does not deteriorate the workability of tightening. Moreover, it has versatility that can be used to display the tightening force of the nut.

[Brief description of drawings]

1A and 1B show a first embodiment of the present invention, in which (a) and (b) are a side view and a plan view of a temporarily fixed state, and (c) and (d) are a side view and a plan view of a tightened state.

2A and 2B show a second embodiment of the present invention, in which FIG. 2A is a side view in a temporarily fixed state, and FIG. 2B is a side view in a tightened state.

3A and 3B show a third embodiment of the present invention, in which FIG. 3A is a side view in a temporarily fixed state, and FIG. 3B is a side view in a tightened state.

[Explanation of symbols]

 1,11,21 Fastening member with fastening display function 2,12 Main body (bolt) 3,13 Male thread 4,14 Bolt head 6,16 Display 7,8,18,19 Object

Claims (3)

[Claims] 1. A fastening member for connecting and fixing two or more objects to each other by screw connection, the fastening portion being capable of performing a rotation operation for screwing, and the fastening portion and the fastening portion. A display portion interposed between the facing object and the display portion, wherein the display portion is pressed against the object by the tightening portion that is rotationally operated and screwed, and protrudes laterally from the tightening portion; Alternatively, the fastening member with a fastening display function is characterized in that the occurrence of a predetermined fastening force is displayed by a display means that changes color. 2. The tightening portion is formed by a bolt head portion of a bolt, and the display portion is attached to the shape so that the soft resin does not protrude laterally to the seat surface of the bolt head. A fastening member with a fastening display function according to Item 1. 3. The display portion is formed of an elastic material into a ring shape having substantially the same outer diameter as a bolt head or a nut and an inner diameter capable of inserting a screw portion. Fastening member with tightening display function.