JP3019023U - Screws with a tightened indication function - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a screw in which the tightening of the screw is performed by using a tightening tool so that it is displayed that the tightening of the screw is performed. [Structure] A shaft-shaped protrusion 4 is provided at the center of the square hole 3 of the head 2 of the bolt A in the axial direction from the bottom surface of the square hole 3. Further, the tightened display thin plate member 5 is held in the square hole 4 in a state of being floated from the bottom surface of the square hole 3 by inserting the protrusion 4 into the hole 6 provided at the center thereof. When the thin plate member 5 is pressed by the tightening tool 21 that is fitted into the square hole 3 when tightening the screw, the thin plate member 5 is punched out by the protruding portion 4,
It is made of a material having low strength such as plastic or cardboard so that it can be pushed into the inner portion of the square hole 3. [Effect] By visually confirming that the thin plate member 5 is pushed into the inner portion of the square hole 3, it can be seen that the screw has been tightened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw used to fasten members to each other, and more particularly to a screw having a tightened indication function which makes it possible to recognize at a glance that the screw has been tightened.

[0002]

[Prior art]

 Conventionally, in the fields of construction and machine manufacturing, many screws such as bolts and screws are used to fasten members together. In that case, in order to prevent forgetting to tighten the screw, after the screw is tightened, paint is applied to the head of the screw, etc., to make a mark indicating that the tightening has been completed. By doing this, the distinction from screws that have not yet been tightened becomes clear, and it is possible to reliably prevent forgetting to tighten screws even in the field of using a large number of screws.

However, in the above case, in addition to the work of tightening the screw, the work of applying paint to the screw is required, which requires more work, which results in the construction work cost and the machine manufacturing cost. It was a factor to up.

[0004]

[Issues to be solved by the device]

 This invention has been made to solve the above-mentioned conventional drawbacks, and the purpose thereof is to indicate that when a screw is tightened with a tightening tool, that fact is displayed on the screw. To provide a screw having a function.

[0005]

[Means for Solving the Problems]

 That is, in order to achieve the above-mentioned object, the present invention comprises a shaft portion 1 having a thread groove 1a formed on an outer peripheral surface thereof, and a head portion 2 having a screw fastening tool fitting square hole 3 formed at a center of an upper surface thereof. And a shaft-shaped protrusion 4 is provided in the center of the square hole 3 in the axial direction from the bottom surface of the square hole 3, and in the square hole 3, a tightened indication is displayed. The thin plate member 5 for use is held in a state of being levitated from the bottom surface of the square hole 3 by inserting the projecting portion 4 into the hole 6 provided at the center thereof, and this thin plate member 5 is tightened when tightening the screws. When it is pressed by the tightening tool 21 that is fitted into the square hole 3, it is punched out by the protrusion 4 and can be pushed into the deep part of the square hole 3, using a weak material such as plastic or cardboard. It is formed.

[0006]

[Work]

 Since it is configured as described above, when it is used to fasten members to each other, first, the shaft portion 1 of the screw is inserted into the member 40 by inserting the member 30 and then the square hole 3 of the head portion 2 of the screw. Then, the tightening tool 21 is fitted in, and the tightening tool 21 is rotated to tighten the screw to fasten the members 30, 40 together. In that case, by inserting the tightening tool 21 into the square hole 3, the thin plate member 5 is pressed by the tightening tool 21, so that the thin plate member 5 is punched out by the protrusion 4 at the hole 6, and the thin plate member 5 is cut into a square shape. It will be pushed into the inner part of the hole 3. After tightening the screw, even if the tightening tool 21 is pulled out from the square hole 3, the thin plate member 5 is still pushed into the deep part of the square hole 3, so by visually observing the state, You can see that the screws have been tightened.

In addition, in the case of the screw of the present invention, since the protrusion 4 is provided at the center of the square hole 3, the screw is tightened by forming the recess 22 into which the protrusion 4 is inserted at the center of the tip. Use the tightening tool 21.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show the case where the screw of the present invention is formed as a bolt A, 1 is the shaft portion of which the screw groove 1a is formed on the outer peripheral surface over substantially the entire length. 2 is a head, and the outer circumference is formed in a circular shape. Reference numeral 3 denotes a screw tightening tool fitting square hole provided in the center of the upper surface of the head 2, and a hexagonal shape is shown in the figure, but it may be formed in another polygonal shape.

Reference numeral 4 denotes a shaft-shaped protrusion provided in the center of the square hole 3 so as to project from the bottom surface of the square hole 3 in the axial direction, and its length does not project from the upper surface of the head 2. ing. The protrusion 4 may be formed at the same time when the bolt A is manufactured by forging.

Reference numeral 5 is a thin plate member for tightening and displaying. The center portion is formed to have a thickness, and the upper end of the protrusion 4 is inserted into the topped hole 6 provided in the center portion. As a result, it is held in the square hole 3 in a state of floating above the bottom surface of the square hole 3. As will be described later, this thin plate member 5 must be formed of a material having such strength that the tops of the holes 6 can be easily punched by the protrusions 4 when pressed by the tightening tool 21. Is preferably plastic or cardboard. Further, the thin plate member 5 may be colored in a color different from that of the bolt A, for example, yellow to be used.

Although the thin plate member 5 has a circular outer shape in the case of the drawing, it may have a shape matching the shape of the square hole 3.

The hole 6 provided at the center of the thin plate member 5 is preferably formed so that the depth thereof is longer than the thickness of the thin plate member 5 and the size thereof is such that the protrusion 4 is inserted into a slightly tight eye. By doing this, since the thin plate member 5 can be securely held by the protrusion 4, it is possible to prevent the thin plate member 5 from being accidentally dropped before the bolt A is tightened. .

To fasten the members 30 and 40 to each other with the bolt A, as shown in FIG. 3, the shaft portion 1 of the bolt A is inserted into the member 40 and screwed into the member 40. The tightening tool 21 is fitted into the square hole 3 of the head 2, and the tightening tool 21 is rotated to tighten the bolt A to fasten the members 30 and 40 together. In that case, since the thin plate member 5 is pressed by the tightening tool 21 by inserting the tightening tool 21 into the square hole 3, the thin plate member 5 is punched out by the protrusion 4 at the top of the hole 6 and It will be pushed into the inner part of the hole 3. After tightening, even if the tightening tool 21 is pulled out from the square hole 3, the thin plate member 5 remains pushed into the deep part of the square hole 3, so by visually checking the state, tighten the bolt A. You can see that it is done. When the thin plate member 5 is colored, it can be more easily confirmed that the thin plate member 5 has been pushed into the inner part of the square hole 3.

The tightening tool 21 used for tightening the bolt A may be an electric one as well as the manual wrench shown in the drawing. In that case, since the protrusion 4 is provided in the center of the square hole 3 of the head 2 of the bolt A, the tightening tool 21 has a protrusion insertion recess 22 formed at the center of the tip. Use to tighten.

In the above embodiment, the case where the screw of the present invention is formed as the bolt A has been described. For example, as a countersunk screw B shown in FIG. 4 or a round head screw shown in FIG. Needless to say, even if it is formed as C, the same operation can be performed.

[0016]

[Effect of device]

 As described above, this invention has the shaft-shaped projection 4 provided in the square hole 3, and the thin plate member 5 for the tightened display is provided in the square hole 3 at the center thereof. When the thin plate member 5 is pressed by the tightening tool 21 that is fitted into the square hole 3 when the screw is tightened, the thin plate member 5 is held while being floated from the bottom surface of the square hole 3 by inserting the portion 4. Since it is made of a weak material such as plastic or cardboard so that it can be punched out by the protrusion 4 and pushed into the inner part of the square hole 3, a tightening tool can be inserted into the square hole and screwed. By tightening, the thin plate will be pushed into the deep part of the square hole, and it can be displayed that the screw has been tightened. For this reason, after tightening the screws, it is necessary to visually confirm that the thin plate is pushed into the back of the square hole without applying any paint to the screws. I understand.

Moreover, since the protrusion 4 is provided at the center of the square hole 3 and the thin plate member 5 is held by the protrusion 4, even when the tightening tool is fitted into the square hole and the screw is tightened, The thin plate does not cause any trouble in tightening the screws. Therefore, the tightening work can be performed by operating the tightening tool in the same manner as the conventional one.

The protrusion 4 can be provided integrally with the screw when manufacturing the screw, and the thin plate member 5 can be formed using inexpensively available plastic or cardboard, which is inexpensive. Can be implemented at cost.

Therefore, when the screw of the present invention is used in the fields of construction and manufacturing of machines, it is possible to contribute to the reduction of construction work costs and machine manufacturing costs.

[Brief description of drawings]

FIG. 1 is a plan view when the present invention is implemented as a bolt.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view showing a tightened state of the one shown in FIG.

FIG. 4 is a vertical cross-sectional view when the present invention is implemented as a countersunk screw.

FIG. 5 is a vertical cross-sectional view when the present invention is implemented as a round-head screw.

[Explanation of symbols]

 A Bolt B Countersunk screw C Round-head screw 1 Shaft 1a Screw groove 2 Head 3 Square hole 4 Shaft-shaped protrusion 5 Thin plate for tightening display 6 Hole in center of thin plate 21 Tightening tool

Claims (1)

[Scope of utility model registration request] 1. A shaft portion 1 having a thread groove 1a formed on an outer peripheral surface thereof.
And a head portion 2 having a square hole 3 for inserting a screw tightening tool in the center of the upper surface thereof, and a shaft-like projection 4 is provided at the center of the square hole 3. Is provided in the axial direction from the bottom surface of the rectangular hole 3, and the thin plate member 5 for tightening the display is inserted into the rectangular hole 3 and the projection 4 is inserted into the hole 6 provided at the center of the rectangular hole 3. The thin plate member 5 is held in a state of being levitated from the bottom surface, and when the thin plate member 5 is pressed by the tightening tool 21 that is fitted into the square hole 3 when tightening the screw, the thin plate member 5 is punched out by the protrusion 4 to form the square hole 3 A screw with a tightened display function that is made of a material with low strength such as plastic or cardboard so that it can be pushed into the inner part of the.