JP2005188655A - Screw member fastening check tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw member fastening check tool for visually, easily and reliably identifying whether screw member such as a bolt/nut is positively fastened or not immediately upon performing fastening work by checking that after the fastening work. <P>SOLUTION: The screw member fastening check tool 1 comprises an annular seat plate part 2 and an index plate part 3 flangedly protruded to the outer periphery of the seat plate part 2. The seat plate part 2 is held between members on which the fastening force of the screw member inserted into an inner diameter hole 4 of the seat plate part 2 operates. The seat plate part 2 has an inner peripheral portion and an outer peripheral portion sectionally shaped with their axial positions mutually shifted. When the fastening force gets to a preset value, the inner peripheral portion and the outer peripheral portion are deformed to eliminate their axial shaft, whereby the angle of the index plate part 3 to a plane perpendicular to the center axis of the seat plate part is changed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a screw member tightening confirmation tool for visually confirming whether screw members such as bolts and nuts are securely tightened.

  Conventionally, the tightening force of screw members such as bolts and nuts is managed by a torque wrench. As a washer interposed between the bolt head or nut and the body to be tightened, in addition to a plain washer, a spring washer 11, a star washer 12, a disc spring washer 13 shown in FIGS. 8A to 8C, A corrugated washer (not shown) or the like is used.

  Management of tightening force with a torque wrench requires a wrench with a management function. In order to confirm the completion of tightening the bolt or nut, it is necessary to measure the tightening force by turning the bolt and nut with a torque wrench. For this reason, in a building or machine facility in which a large number of bolts are used, a great deal of labor is required for management work.

  Each of the washers 11 to 13 shown in FIGS. 8A to 8C is elastically deformed when a tightening force is applied, but is loosened by an elastic restoring force. When force is applied, it only deforms flatly, and it is impossible to visually confirm whether or not tightening is complete only from the deformed state.

  The object of the present invention is to tighten a screw member that can be easily and surely confirmed by visual inspection after a tightening operation, immediately after the tightening operation, whether or not a screw member such as a bolt or a nut has been securely tightened. It is to provide a confirmation tool.

The screw member tightening confirmation tool of the present invention has an annular seat plate portion and an indicator plate portion that projects in a hook shape on the outer periphery of the seat plate portion. The seat plate portion is a portion sandwiched between members to which the tightening force of the screw member inserted into the inner diameter hole of the seat plate portion acts, and the axial positions of the inner peripheral portion and the outer peripheral portion are shifted from each other. When the tightening force reaches a predetermined value, the inner peripheral portion and the outer peripheral portion are deformed so that there is no axial displacement, and the deformation causes the angle of the indicator plate portion to be perpendicular to the central axis of the seat plate portion. It is supposed to change with respect to a flat surface.
When screw members such as bolts or nuts are tightened using the screw member tightening confirmation tool of this configuration, the seat plate portion of the screw member tightening confirmation tool is substantially flat so that there is no axial displacement between the inner peripheral portion and the outer peripheral portion. Transforms into With this deformation, the indicator plate portion of the screw member tightening confirmation tool changes the angle with respect to the plane perpendicular to the central axis of the seat plate portion. This deformation of the indicator plate part makes it possible to see the back side of the indicator plate part that was not visible in the initial state, so whether or not the screw member is securely tightened can be confirmed immediately during the tightening operation or during the tightening operation. It can be confirmed easily and reliably by visual inspection in a later check operation. The screw member tightening confirmation tool may also be used as a washer, or may be used exclusively for tightening confirmation separately from the washer.

  In the present invention, the indicator plate portion may have different front and back colors. When the front and back colors of the indicator plate portion are made different from each other in this way, when the screw member is securely tightened, the indicator plate portion is deformed so that the back surface of a color different from the front surface can be seen. Therefore, from this color change, visual confirmation that the tightening is completed can be more easily and reliably performed.

  In these inventions, the indicator plate portion may have a flat shape. When the indicator plate portion is flat, the back side of the indicator plate portion that was not visible in the initial state becomes visible when the screw member is securely tightened, so visual confirmation that the tightening is complete, It can be done easily and reliably.

  Further, in the present invention, the indicator plate portion has a shape in which an outer peripheral edge protrudes in the same axial direction as the inner peripheral portion of the seat plate portion, and the seat plate portion is tightened and deformed by a tightening force reaching the predetermined value. Thus, the angle may be changed until the indicator plate portion is reversed. Thus, when it is set as the structure which reverses front and back, when it sees from the front of a screw member, since completion | finish of clamping | tightening can be confirmed by seeing the back surface of an indicator plate part, clamping completion can be confirmed much more easily.

In the screw member tightening confirmation tool having the above-described configurations according to the present invention, a cylindrical portion that protrudes from the inner peripheral edge of the seat plate portion toward the back surface side may be provided. For example, the cylindrical portion may protrude from the indicator plate portion toward the back surface side.
When the cylindrical portion is provided in this way, the cylindrical portion enters the bolt insertion hole of the member to be tightened, whereby the screw member tightening confirmation tool can be positioned. This prevents the seat plate portion from being deformed evenly around the entire circumference during tightening, and the appearance of the indicator plate portion from being different depending on the circumferential position. Therefore, it can be confirmed by the indicator plate portion that the tightening force has reached a predetermined value no matter where the entire circumference is viewed.

  The screw member tightening confirmation tool of the present invention has an annular seat plate portion and an indicator plate portion projecting like a bowl on the outer periphery of the seat plate portion, and the seat plate portion is formed in an inner diameter hole of the seat plate portion. When the inserted screw member is sandwiched between the members to which the tightening force acts, and the axial positions of the inner peripheral portion and the outer peripheral portion are shifted from each other, and the tightening force reaches a predetermined value Since the inner peripheral portion and the outer peripheral portion are deformed so that there is no axial shift, the angle of the indicator plate portion is changed with respect to a plane perpendicular to the central axis of the seat plate portion by the deformation. Whether or not the screw member is securely tightened can be confirmed easily and reliably by visual inspection immediately after the tightening operation by a check after the tightening operation.

  A first embodiment of the present invention will be described with reference to FIGS. The screw member tightening confirmation tool 1 is made of sheet metal, and as shown in FIGS. 1A and 1B in a plan view and a sectional view, an annular seat plate portion 2 and an outer periphery of the seat plate portion 2 are provided. And a flat indicator plate portion 3 that projects like a bowl. The seat plate portion 2 is a portion sandwiched between members (for example, washers and nuts) on which a tightening force of a screw member (for example, a bolt) inserted into the inner diameter hole 4 of the seat plate portion 2 acts, and an inner peripheral portion. 2a and the outer peripheral part 2b are made into the cross-sectional shape which the axial direction position shifted | deviated mutually. Specifically, the seat plate portion 2 is formed in a bulging shape that bulges from the inner peripheral portion of the indicator plate portion 3 to the surface side thereof, and the outer peripheral portion 2 b of the seat plate portion 2 is formed of the indicator plate portion 3. An inner peripheral portion 2a is formed as a flat portion that is formed in an inclined portion that rises inclined from the inner peripheral portion, and is connected to the upper end of the inclined portion.

  When the tightening force reaches a predetermined value, the seat plate portion 2 is deformed so that there is no axial displacement between the inner peripheral portion 2a and the outer peripheral portion 2b, as indicated by a virtual line in FIG. Thus, the angle θ with respect to the plane P (FIG. 3) perpendicular to the central axis O (FIG. 1) of the seat plate portion 2 of the index plate portion 3 is changed. The angle θ of the indicator plate 3 that changes with the deformation of the seat plate 2 can be increased or decreased by changing the horizontal width or height of the outer peripheral portion 2b of the seat plate 2, for example. . Further, the deformation of the seat plate portion 2 due to the action of the tightening force may be plastic deformation or elastic deformation.

  FIG. 2 is a cross-sectional view showing an example of a usage state in which the screw member tightening confirmation tool 1 is used when two members to be tightened 9 and 10 are fastened and joined by bolts 5 and nuts 6 which are screw members. In this example of use state, the bolt 5 is inserted into the bolt insertion holes 9 a and 10 a of both the tightened members 9 and 10 through the normal washer 7. The screw member tightening confirmation tool 1 is disposed on the side of the tightened member 10 from which the male screw portion 5a of the bolt 5 protrudes via another normal washer 8 so that the male screw portion 5a is inserted into the inner diameter hole 4 thereof. The screw member tightening confirmation tool 1 is sandwiched in the axial direction between the nut 6 and the washer 8 which are screwed into the male screw portion 5a.

  In the case of this use state example, as shown in FIG. 2A, in the initial state where the tightening force does not act on the screw member tightening confirmation tool 1, the indicator plate portion 3 of the screw member tightening confirmation tool 1 is in contact with the surface of the washer 8. Yes. That is, the angle of the indicator plate portion 3 with respect to a plane perpendicular to the central axis O of the screw member tightening confirmation tool 1 (a plane parallel to the surface of the washer 8) is 0 degrees. When the nut 6 is tightened from this initial state as shown in FIG. 2B, a tightening force is applied to the screw member tightening confirmation tool 1, and the seat plate portion 2 of the screw member tightening confirmation tool 1 is connected to the inner peripheral portion 2a. The outer peripheral portion 2b is deformed almost flat so that there is no axial displacement. The seat plate 2 may be deformed until it is completely flat. Along with this deformation, the indicator plate portion 3 of the screw member tightening confirmation tool 1 changes an angle with respect to a plane perpendicular to the seat plate portion central axis O (here, the surface of the washer 8). That is, the indicator plate portion 3 is inclined toward the side where the outer peripheral edge is separated from the surface of the washer 8 with the inner peripheral portion as a fulcrum. This deformation of the indicator plate 3 makes it possible to see the back side of the indicator plate 3 that was not visible in the initial state. Alternatively, it can be confirmed easily and reliably by visual inspection in the check operation after the tightening operation.

  In particular, when the screw member tightening confirmation tool 1 is used in a place where the work of tightening screw members such as bolts and nuts is performed at a large number of places such as a construction site, the reliability of the tightening work of the screw members Work efficiency can be dramatically improved. For example, when many locations between steel frames are to be joined with bolts and nuts at a building construction site, the time required for another worker to retighten the bolts and nuts at each location after performing a tightening operation as before. The bolts and nuts can be obtained simply by visually confirming the change of the indicator plate part 3 of the screw member tightening confirmation tool 1 at each tightening position using binoculars or the like without performing troublesome work. It can be confirmed whether or not it is securely tightened. If there is a portion that is not tightened, it is only necessary to perform the tightening operation again only at that portion.

  In the above embodiment, the indicator plate part 3 may have different front and back colors. For example, the back surface is colored with paint or the like. If the front and back colors of the indicator plate part 3 are made different in this way, when the bolt 5 and the nut 6 are securely tightened, the indicator plate part 3 is deformed so that the back surface of a color different from the front surface can be seen. The visual confirmation that the tightening is completed from the color change can be performed more easily and reliably.

The indicator plate portion 3 of the screw member tightening confirmation tool 1 may have the following shape. For example, in an initial state where no tightening force is applied, a predetermined angle θ1 is made with respect to the plane P perpendicular to the seat plate center axis O as shown in FIG.
In the case of this configuration, when the seat plate portion 2 is deformed almost flat by the action of the tightening force on the screw member tightening confirmation tool 1 upon completion of tightening of the screw member, the indicator plate portion as shown in FIG. 3 is deformed to an angle of about 90 degrees with respect to the plane P perpendicular to the central axis O of the seat plate portion. By setting the angle of the indicator plate portion 3 in this way, the back surface of the indicator plate portion 3 can be visually observed from the side when the tightening is completed, and visual confirmation of the completion of tightening can be performed more easily.

Further, the indicator plate portion 3 of the screw member tightening confirmation tool 1 is substantially 90 degrees with respect to the surface P perpendicular to the center axis O of the seat plate portion as shown in FIG. You may make it have angle (theta) 2.
In the case of this configuration, when the seat plate portion 2 is deformed almost flat by the action of the tightening force on the screw member tightening confirmation tool 1 upon completion of tightening of the bolt 5 and nut 6, as shown in FIG. The indicator plate portion 3 is deformed to an angle exceeding 90 degrees with respect to the plane P perpendicular to the seat plate portion central axis O, that is, an angle at which the indicator plate portion 3 is reversed. By setting the angle of the indicator plate portion 3 in this way, the back surface of the indicator plate portion 3 can be visually observed from above the screw member when tightening is completed, and visual confirmation of the completion of tightening can be performed more easily and reliably. it can.

6 and 7 show still another embodiment of the present invention. In this embodiment, in the first embodiment shown in FIGS. 1 to 3, a cylindrical portion 15 that protrudes from the inner peripheral edge of the seat plate portion 2 to the back surface side is provided. The tip of the cylindrical portion 15 protrudes on the back side from the indicator plate portion 3. Other configurations are the same as those of the first embodiment.
When the cylindrical portion 15 is provided in this way, as shown in FIG. 7, the cylindrical portion 15 enters the bolt insertion hole 10 a of the member to be tightened 10, so that the screw member tightening confirmation tool 1 is connected to the bolt insertion hole 10 a. Is positioned with respect to. Therefore, it is possible to prevent the seat plate portion 2 from being deformed evenly around the entire circumference during tightening, and the appearance of the indicator plate portion 3 to be different depending on the circumferential position. Therefore, it can be correctly confirmed by looking at the indicator plate portion 3 that the tightening force has reached a predetermined value no matter where the entire circumference is viewed.

  In the above-described embodiment, the case where the screw member tightening confirmation tool 1 is used when the two members to be tightened 9 and 10 are fastened and joined by the bolt 5 and the nut 6 has been described as an example. For example, the screw member tightening confirmation tool 1 can also be used to easily and surely confirm the completion of tightening by using the screw member tightening confirmation tool 1 even in a tightening portion where a nut is screwed into a stud bolt or an embedded bolt, for example. .

(A) is a top view of the screw member tightening confirmation tool concerning 1st Embodiment of this invention, (B) is sectional drawing of the confirmation tool. It is explanatory drawing which shows the example of a use condition of the screw member fastening confirmation tool. It is explanatory drawing of the deformation | transformation operation | movement of the screw member fastening confirmation tool. (A) is principal part sectional drawing which shows the state before a deformation | transformation of the screw member fastening confirmation tool concerning other embodiment of this invention, (B) is principal part sectional drawing which shows the deformation | transformation state of the confirmation tool. (A) is principal part sectional drawing which shows the state before a deformation | transformation of the screw member fastening confirmation tool concerning further another embodiment of this invention, (B) is principal part sectional drawing which shows the deformation | transformation state of the confirmation tool. (A) is a top view of the screw member tightening confirmation tool concerning further another embodiment of this invention, (B) is a sectional view of the confirmation tool. It is explanatory drawing which shows the example of a use condition of the screw member fastening confirmation tool. (A), (B) is a perspective view which shows each conventional washer, respectively, (C) is sectional drawing of another conventional washer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Screw member tightening confirmation tool 2 ... Seat plate part 2a ... Inner peripheral part 2b ... Outer peripheral part 3 ... Indicator plate part 4 ... Inner diameter hole 5 ... Bolt 6 ... Nut 8 ... Washer 9 ... Cylindrical part 15 ... Cylindrical part O ... Seat Plate center axis

Claims (5)

  It has an annular seat plate portion and an indicator plate portion projecting in a bowl shape on the outer periphery of the seat plate portion, and the seat plate portion is acted upon by a tightening force of a screw member inserted into an inner diameter hole of the seat plate portion. A portion that is sandwiched between the inner and outer peripheral portions, wherein the axial positions of the inner peripheral portion and the outer peripheral portion are offset from each other, and when the tightening force reaches a predetermined value, the axial direction of the inner peripheral portion and the outer peripheral portion A screw member tightening confirmation tool that is deformed so that there is no deviation and changes the angle of the indicator plate portion with respect to a plane perpendicular to the central axis of the seat plate portion.   The screw member tightening confirmation tool according to claim 1, wherein the indicator plate portion has different front and back colors.   The screw member tightening confirmation tool according to claim 1 or 2, wherein the indicator plate portion has a flat shape.   2. The indicator plate portion according to claim 1, wherein the indicator plate portion has a shape in which an outer peripheral edge projects in the same axial direction as an inner peripheral portion of the seat plate portion, and the seat plate portion is tightened and deformed by a tightening force reaching the predetermined value. Thus, the screw member tightening confirmation tool that changes the angle until the indicator plate part is reversed. The screw member tightening confirmation tool according to any one of claims 1 to 4, wherein a cylindrical portion that protrudes from the inner peripheral edge of the seat plate portion to the back surface side is provided.

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