JP2017116027A - Bolt removal prevention material - Google Patents

Abstract

[Problem] To provide a bolt slip-out prevention material that is easy to work with on fastened components. [Solution] The bolt slip-out prevention material (1) comprises a cylindrical portion having a metallic inner fitting portion (12) that forms a bolt insertion hole (1a) and an outer fitting portion (11) provided on the outside of the inner fitting portion (12), a protruding portion that protrudes from the cylindrical portion into the bolt insertion hole (1a) and is engageable with the threaded portion (2C) of the bolt (2), and a flange portion (13) that protrudes outward from the axial end of the inner fitting portion (12). The outer fitting portion (11) is made of a material that has higher elasticity than the metallic material that makes up the inner fitting portion (12). [Selected Figure] Figure 3

Description

  The present invention relates to a bolt drop prevention material that prevents a bolt fastened to a member to be fastened from coming off.

  Conventionally, a bolt slip-off preventing material that prevents a bolt fastened to a fastened member from falling off has been proposed (see, for example, Patent Document 1). The bolt disengagement prevention material of Patent Document 1 has a bolt engaging portion and has a substantially covered cylindrical shape, and is inserted into an attachment hole formed on the opposite side of the member to be fastened to the side on which the bolt is inserted, The bolt engagement part is engaged with the screw thread of the bolt to prevent the bolt from coming off.

Republished 2006-022103

  However, since the bolt disengagement prevention material of Patent Document 1 needs to be inserted on the side opposite to the side where the bolt is inserted as viewed from the operator, workability is poor.

  Therefore, an object of the present invention is to provide a bolt slip-off preventing material with good workability for a fastened member.

  In order to solve the above-described object, a bolt drop prevention material according to an aspect of the present invention includes an inner part that forms a bolt insertion hole, and a cylindrical part that has an outer part provided outside the inner part, A protruding portion that protrudes inward of the bolt insertion hole from the tubular portion and engageable with a screw portion of the bolt; and a flange portion that protrudes outward from an end portion in the axial direction of the tubular portion. ing. The inner part of the cylindrical part is made of a metal material, and the outer part of the cylindrical part is made of a material having higher elasticity than the metal material constituting the inner part of the cylindrical part. Also good.

  Moreover, the said cylindrical part can be inserted in the insertion hole formed in the metal 1st to-be-fastened member, The said outer side part of the said cylindrical part is a metal material which comprises the said 1st to-be-fastened member It may be made of a material having higher elasticity.

  The protruding portion may protrude inward of the bolt insertion hole from the inner side portion of the cylindrical portion.

  Further, a through hole is formed in the inner part of the cylindrical part, and the protruding part is provided in the outer part of the cylindrical part, penetrates the through hole of the inner part, and the bolt You may protrude inward of the insertion hole.

  The outer portion of the cylindrical portion may be tapered toward the opposite side to the flange portion side.

  When the bolt is inserted into the insertion hole of the first member to be fastened and screwed into the screw hole of the second member to be fastened to fasten the first member to be fastened and the second member to be fastened. The cylindrical portion is inserted into the insertion hole of the first fastened member from the side where the bolt is inserted, the protruding portion is engaged with a screw portion of the bolt, and the flange portion is You may contact | abut to a 1st to-be-fastened member and support the head of the said volt | bolt.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly | attachment property with respect to a to-be-fastened member is good, and the workability | operativity at the time of tightening or loosening a bolt to a to-be-fastened member can be provided.

The figure for demonstrating the method to fasten the 1st, 2nd to-be-fastened member with a volt | bolt using the bolt omission prevention material which concerns on embodiment of this invention is shown. It is a figure which shows the state which notched part of the volt | bolt omission prevention material shown in FIG. 1, and a 1st, 2nd to-be-fastened member. The perspective view of the bolt omission prevention material concerning a 1st embodiment is shown. The bottom view of the bolt omission prevention material which concerns on 1st Embodiment is shown. The bolt disengagement prevention material according to the first embodiment and the bolt disengagement prevention material, the first and second members to be fastened in a state in which the first and second members to be fastened are fastened by bolts are cut in FIG. A cross-sectional view cut by a plane is shown. The perspective view of the bolt omission prevention material which concerns on 2nd Embodiment is shown. The bolt disengagement preventive material corresponding to FIG. 2 and the first and second fastened members in a state in which the first and second fastened members are fastened by bolts using the bolt disengagement preventing material according to the second embodiment. FIG.

  A bolt drop prevention material according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram for explaining a method of fastening first and second fastened members 3 and 4 with bolts 2 using a bolt drop prevention material 1 according to the first embodiment. FIG. 2 is a view showing a state in which a part of the bolt drop prevention material 1, the first and second fastened members 3, 4 shown in FIG. 1 is cut out.

    As shown in FIGS. 1 and 2, the bolt 2 has a head 2 </ b> A and a shank 2 </ b> B, and a screw portion 2 </ b> C (FIG. 5) is formed on the outer periphery of the shank 2 </ b> B. The 1st to-be-fastened member 3 is a board | plate material made from metal (for example, stainless steel (SUS304)), and the insertion hole 3a penetrated up and down is formed. The 2nd to-be-fastened member 4 is a board | plate material made from metal (for example, steel materials (SPCC)), and the screw hole 4a penetrated up and down is formed. The fitting hole 3 a of the first fastened member 3 is configured to be larger than the screw hole 4 a of the second fastened member 4.

  For example, the second fastened member 4 corresponds to a peripheral portion that forms an opening for maintaining the gas line in a housing that houses a plurality of gas lines of a fluid control device used in a semiconductor manufacturing apparatus or the like. The first fastened member 3 corresponds to a cover for covering the opening.

  Next, the bolt drop prevention material 1 will be described in detail with reference to FIGS.

  3 is a perspective view of the bolt drop prevention material 1, FIG. 4 is a bottom view of the bolt drop prevention material 1, and FIG. 2 is a cross-sectional view of the bolt drop prevention material 1, the first and second fastened members 3 and 4 cut along the cut surface of FIG. 2 in a state where the fastened members 3 and 4 are fastened.

  The bolt drop prevention material 1 has a bolt insertion hole 1a and is made of, for example, a metal material (for example, stainless steel (SUS304)) having rigidity equal to or higher than that of the bolt 2 made of stainless steel (SUSXM7). The main body part 10 and the cylindrical outer fitting part 11 are provided.

  The main body portion 10 includes an inner insertion portion 12, a flange portion 13, and three projecting portions 14. The inner insertion portion 12 has a cylindrical shape, and the bolt insertion hole 1a is formed by the inner peripheral surface 12A. The flange portion 13 protrudes outward in the radial direction from the axial end portion of the inner insertion portion 12. Thus, the inner insertion part 12 and the flange part 13 are comprised integrally. The outer diameter of the flange portion 13 is configured to be larger than the inner diameter of the insertion hole 3 a of the first fastened member 3. The three protruding portions 14 protrude from the inner peripheral surface 12A of the inner fitting portion 12 inward of the bolt insertion hole 1a and are provided at equal intervals in the circumferential direction.

  The outer insertion portion 11 has a cylindrical shape, and is made of a metal material (for example, aluminum) or a synthetic resin material (for example, PTFE (polytetrafluoroethylene)) having higher elasticity than the metal materials constituting the main body portion 10 and the first fastened member 3. Fluoroethylene)). The outer insertion portion 11 is provided on the outer periphery of the inner insertion portion 12. The outer insertion portion 11 and the inner insertion portion 12 constitute a cylindrical portion. The outer insertion portion 11 corresponds to the outer side portion of the cylindrical portion, and the inner insertion portion 12 corresponds to the inner side portion of the cylindrical portion. The outer diameter of the outer fitting portion 11 is configured to be slightly larger than the inner diameter of the fitting hole 3 a of the first fastened member 3.

  Next, an example of a method for fastening the first fastened member 3 and the second fastened member 4 with the bolt 2 using the bolt disengagement preventing material 1 of the present embodiment will be described.

  First, from the side where the bolt 2 is inserted, the cylindrical portions (the outer insertion portion 11 and the inner insertion portion 12) of the bolt drop prevention material 1 are fitted into the insertion holes 3a of the first fastened member 3. The outer diameter of the outer insertion portion 11 is configured to be slightly larger than the inner diameter of the insertion hole 3 a, and the outer insertion portion 11 has higher elasticity than the metal material constituting the main body portion 10 and the first fastened member 3. Since it is made of a material, it is fitted (press-fit) in an elastically deformed (reduced diameter) state. The flange portion 13 of the main body portion 10 contacts the first fastened member 3.

  Next, with respect to the second member to be fastened 4 to which the first member to be fastened 3 to which the bolt disengagement prevention material 1 is attached, the insertion hole 3a of the first member to be fastened 3 becomes the screw hole 4a of the second member to be fastened 4. Overlay to communicate. The bolt 2 is inserted into the bolt insertion hole 1a of the bolt drop prevention material 1 while being rotated, and the screw portion 2C of the bolt 2 and the screw hole 4a of the second fastened member 4 are screwed together. In a state where the screw portion 2C of the bolt 2 and the screw hole 4a of the second fastened member 4 are screwed together, the protruding portion 14 is engaged (contacted) with the screw portion 2C of the bolt 2, and The head 2 </ b> A is in contact with the flange portion 13 of the bolt drop prevention material 1.

  As described above, the bolt drop prevention material 1 of the present embodiment has a cylindrical shape including the metal inner insertion portion 12 that forms the bolt insertion hole 1 a and the outer insertion portion 11 provided outside the inner insertion portion 12. Projecting inward from the inner insertion portion 12 and the bolt insertion hole 1a, projecting from the axial portion of the inner insertion portion 12 and projecting portion 14 engageable with the screw portion 2C of the bolt 2. And a flange portion 13. The outer insertion portion 11 is made of a material having higher elasticity than the metal material constituting the inner insertion portion 12.

  The bolt 2 is inserted into the fitting hole 3a of the first fastened member 3 and is screwed into the screw hole 4a of the second fastened member 4, thereby fastening the first fastened member 3 and the second fastened member 4 together. In this case, the cylindrical portion composed of the inner insertion portion 12 and the outer insertion portion 11 is inserted into the insertion hole 3a of the first fastened member 3 from the side where the bolt 2 is inserted, and the protruding portion 14 is the bolt 2. The flange portion 13 abuts on the first fastened member 3 and supports the head 2A of the bolt 2.

  With this configuration, the operator can attach the bolt drop prevention material 1 to the first fastened member 3 from the side where the bolt 2 is inserted, so that the assembly of the bolt drop prevention material 1 can be improved. Further, since the bolt disengagement preventing material 1 is fitted in the fitting hole 3a of the first fastened member 3, the first fastened member 3 and the second fastened member 4 are fastened by the bolt 2, so that workability is improved. Can be improved.

  Moreover, since the bolt drop prevention material 1 is fitted into the fitting hole 3a of the first fastened member 3, the protrusion 14 provided on the fitted bolt removal prevention material 1 and the screw portion 2C of the bolt 2 are engaged. The bolt 2 can be prevented from coming off. Since the flange portion 13 abuts on the first fastened member 3 and supports the head 2A of the bolt 2, the flange portion 13 can function as a washer. Thus, the bolt dropout prevention material 1 has two functions of preventing the bolt 2 from coming off and a washer.

  The cylindrical portion formed by the inner insertion portion 12 and the outer insertion portion 11 can be inserted into the insertion hole 3a formed in the first fastening member 3 made of metal, and the outer insertion portion 11 The fastening member 3 is made of a material having elasticity higher than that of the metal material. With this configuration, the outer fitting portion 11 can be easily fitted into the first fastened member 3 by being elastically deformed.

  Next, a bolt drop prevention material 101 according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 shows a perspective view of the bolt drop prevention material 101 according to the second embodiment, and FIG. 7 shows the first and second bolts using the bolt drop prevention material 101 according to the second embodiment. FIG. 3 is a cross-sectional view of the bolt drop prevention material 101 corresponding to FIG. 2 and the first and second fastened members 3 and 4 in a state in which the second fastened members 3 and 4 are fastened.

  The bolt drop prevention material 101 has a bolt insertion hole 101a, a main body portion 110 made of the same metal material as the main body portion 10 of the bolt drop prevention material 1 according to the first embodiment, and a cylindrical outer side. The insertion part 111 is provided.

  The main body 110 has an inner insertion portion 112 and a flange portion 113. The inner insertion portion 112 has a cylindrical shape, and the bolt insertion hole 101a is formed by the inner peripheral surface 112A thereof. In the inner insertion portion 112, through holes 112b penetrating the inner insertion portion 112 in the radial direction are formed at three equal intervals. In FIGS. 6 and 7, only two through holes 112b are shown. The flange portion 113 protrudes outward in the radial direction from the end portion in the axial direction of the inner insertion portion 112. Thus, the inner insertion portion 112 and the flange portion 113 are integrally formed. The outer diameter of the flange portion 113 is configured to be larger than the inner diameter of the fitting hole 3 a of the first fastened member 3.

  The outer insertion portion 111 has a cylindrical shape, and is a metal material (for example, aluminum) or a synthetic resin having higher elasticity (lower rigidity) than each metal material constituting the main body 110, the first fastening member 3, and the bolt 2. It is made of a material (for example, PTFE). The outer insertion portion 111 is provided on the outer periphery of the inner insertion portion 112. The outer insertion portion 111 and the inner insertion portion 112 constitute a cylindrical portion. The outer insertion portion 111 corresponds to the outer portion of the cylindrical portion, and the inner insertion portion 112 corresponds to the inner portion of the cylindrical portion. The outer diameter of the outer fitting portion 111 is configured to be slightly larger than the inner diameter of the fitting hole 3 a of the first fastened member 3.

  Moreover, the three insertion parts 114 are provided in the outer fitting part 111 in the inner surface 111A at equal intervals in the circumferential direction. Each protrusion 114 passes through the corresponding through hole 112b of the inner insertion portion 112 and protrudes inward of the bolt insertion hole 101a. The distance from the axis of the bolt insertion hole 101a to the tip of each protrusion 114 is configured to be shorter than the distance from the axis of the shank 2B of the bolt 2 to the tip of the thread of the screw part 2C.

  The bolt drop prevention material 101 of the present embodiment can achieve the same effects as the bolt drop prevention material 1 of the first embodiment. Moreover, since the protrusion part 114 is comprised by the metal material or synthetic resin material which has higher elasticity (low rigidity) than the metal material which comprises the volt | bolt 2, as shown in FIG. It is possible to further prevent the bolt 2 from being fitted into the screw thread of the screw portion 2C of the bolt 2.

  In addition, this invention is not limited to the Example mentioned above. A person skilled in the art can make various additions and changes within the scope of the present invention.

  For example, in the above embodiment, the outer fitting portions 11 and 111 may be tapered toward the opposite side of the flange portions 13 and 113 side. Although the protrusion parts 14 and 114 were provided in three places, the number of the protrusion parts 14 and 114 is not restricted to this, You may provide the number as needed. Moreover, although the 1st, 2nd to-be-fastened members 3 and 4 were the members which comprise the housing | casing of a fluid control apparatus, not only this but the member which comprises the housing | casing of another apparatus may be sufficient.

DESCRIPTION OF SYMBOLS 1, 101: Bolt drop prevention material 1a, 101a: Bolt insertion hole 2: Bolt 2A: Head 2C: Screw part 3: First to-be-fastened member 3a: Insertion hole 4: Second to-be-fastened member 4a: Screw holes 10, 110 : Main body part 11, 111: Outer insertion part 12, 112: Inner insertion part 13, 113: Flange part 14, 114: Projection part

Claims (7)

A cylindrical part having an inner part forming a bolt insertion hole, and an outer part provided outside the inner part;
A protruding portion that protrudes inward of the bolt insertion hole from the cylindrical portion and is engageable with a screw portion of the bolt;
A bolt drop prevention material comprising: a flange portion protruding outward from an axial end portion of the tubular portion. The inner part of the cylindrical part is made of a metal material,
2. The bolt drop prevention material according to claim 1, wherein the outer portion of the tubular portion is made of a material having higher elasticity than a metal material constituting the inner portion of the tubular portion. The cylindrical part can be fitted into a fitting hole formed in the first fastening member made of metal,
The bolt drop prevention material according to claim 2, wherein the outer portion of the cylindrical portion is made of a material having higher elasticity than a metal material constituting the first fastened member.   The bolt protruding prevention material according to any one of claims 1 to 3, wherein the protruding portion protrudes inward of the bolt insertion hole from the inner portion of the cylindrical portion. A through hole is formed in the inner portion of the cylindrical portion,
The said protrusion part is provided in the said outer side part of the said cylindrical part, penetrates the said through hole of the said inner side part, and protrudes inward of the said bolt insertion hole. The bolt drop prevention material according to claim 1.   The bolt outer prevention material according to any one of claims 1 to 5, wherein the outer portion of the cylindrical portion is tapered toward the side opposite to the flange portion side. When the bolt is inserted into the insertion hole of the first fastened member and screwed into the screw hole of the second fastened member to fasten the first fastened member and the second fastened member,
The cylindrical portion is fitted into the insertion hole of the first fastened member from the side where the bolt is inserted, the protruding portion engages with the screw portion of the bolt, and the flange portion The bolt disengagement prevention material according to any one of claims 1 to 6, which contacts the first fastened member and supports the head of the bolt.

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