JP5379202B2 - Fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening device capable of enhancing workability at fastening work or the like by preventing a fastening member from dropping out of a component while sufficiently securing the flexibility of movement in a radial direction of the fastening member. <P>SOLUTION: A screw device 1 is composed of a cylindrical retainer 5 keeping a clinching fastener 10 at a tip and an inwardly-directed flange 12 at a base end side, a screw member 6 keeping a male screw 21 at a tip side of a shaft 20 loosely penetrating an inner space of the retainer 5 and an outwardly-directed flange 22 engaged with a tip side of the inwardly directed flange 12 in a midway of a shaft 20; and a head 7 coupled to the base end side of the shaft 20 of the screw member 6 and abutting on a base end surface of the retainer 5. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a fastening device that can absorb a displacement of a fastening position such as a screwing position caused by a processing error or an assembly error of a part.

  In general, parts (assembly parts) such as panels that make up the casing of electronic devices such as personal computers, and door panels of electrical cabinets that house power supply and control electrical units such as switchboards and monitoring panels It is fastened and fixed to the side parts, etc. (other parts) by screws or the like. In this case, in order to absorb the displacement of the screwing position caused by part processing error, assembly error, etc., in general, an assembly part that is fastened and fixed by screwing has a round diameter larger than the screw diameter. A hole, a long hole, or the like is drilled.

  On the other hand, as a screw device for the purpose of further improving the functionality while maintaining the function of absorbing the displacement of the screwing position, for example, Patent Document 1 discloses a screw formed at the tip of a leg portion. A screw member in which an unthreaded portion having a predetermined length thinner than the thread root diameter is formed between the thread (male thread portion) and the head, and a resin having an inner diameter larger than the unthreaded portion and smaller than the thread diameter A screw device including a retaining member made of steel is disclosed. This screw device is attached to an assembly part such as a door plate in a state in which the screwless part of the screw member is loosely fitted to the retaining member, thereby absorbing the displacement of the screwing position and removing the screw from the part. It is possible to improve the workability at the time of fastening work etc. by preventing the dropout.

JP 2003-322133 A

  However, as in the technique disclosed in Patent Document 1 described above, in the configuration in which the screw member is held on the assembly part such as the door plate via the retaining member, the freedom of movement of the screw member in the radial direction is increased. In order to enlarge, it is necessary to set a large difference between the inner diameter of the retaining member (that is, the diameter of the thread portion) and the outer diameter of the screwless portion. In such a case, it is possible to increase the degree of freedom of movement of the screw by increasing the diameter of the threaded part or by reducing the diameter of the threadless part, but the outer diameter of the threaded part Setting the difference from the outer diameter of the screwless portion to be larger than necessary is not preferable from the viewpoint of structure or strength, and is not realistic.

  The present invention has been made in view of the above circumstances, and while ensuring a sufficient degree of freedom of movement of the fastening member in the radial direction, prevents the fastening member from falling off from the parts, thereby improving workability during fastening work and the like. It aims at providing the fastening device which can be improved.

A fastening device according to one aspect of the present invention has a coupling portion that can be coupled to an assembly component that is assembled to another component by fastening at the distal end portion, and an engaged projection that projects in the inner circumferential direction on the base side. A cylindrical retainer, and a fastening portion on the distal end side of the shaft portion loosely penetrated in the inner space of the retainer, and an engagement protrusion that can be engaged with the distal end side of the engaged protrusion, the shaft portion A fastening member having a midway, and a head that is spaced apart from the engagement protrusion and is connected to the proximal end side of the shaft portion of the fastening member and is capable of contacting the proximal end surface of the retainer , The fastening member is connected to the head portion by press-fitting the proximal end side of the shaft portion loosely penetrated into the internal space of the retainer .

  According to the fastening device of the present invention, it is possible to improve the workability at the time of fastening work and the like by preventing the fastening member from falling off from the part while sufficiently securing the freedom of movement of the fastening member in the radial direction. it can.

Side view of screw device Cross-sectional view of main parts along the axial direction of the screw device Exploded perspective view of screw device (A) is a side view of the head, (b) is a top view of the head, and (c) is a bottom view of the head. Side view showing part of retainer broken Side view of screw member Explanatory drawing showing an example of assembly procedure of screw device Explanatory drawing which shows an example of the fastening procedure by a screw device Side view showing a modification of the screw device Side view showing a modification of the screw device

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is a side view of the screw device, FIG. 2 is a cross-sectional view of the main part along the axial direction of the screw device, FIG. 3 is an exploded perspective view of the screw device, and FIG. Is a side view of the head, (b) is a top view of the head, (c) is a bottom view of the head, FIG. 5 is a side view showing a part of the retainer, and FIG. 6 is a screw. FIG. 7 is an explanatory view showing an example of the assembly procedure of the screw device, FIG. 8 is an explanatory view showing an example of the fastening procedure by the screw device, FIG. 9 is a side view showing a modification of the screw device, and FIG. FIG. 9 is a side view showing a modification of the screw device.

  A screw device 1 shown as an example of a fastening device in FIG. 1 is a screw device suitable for use in assembling a housing of an electronic device such as a personal computer. The assembly part 102 (see FIG. 8) made of a panel or the like is fastened and fixed to the main body part 101 (see FIG. 8) as the above part. Here, when the screw device 1 is applied, for example, a female screw portion 103 is formed in the main body part 101. Further, a screw insertion hole 104 having a diameter larger than that of the female screw portion 103 is formed in the assembly component 102 at a position corresponding to the female screw portion 103.

  As shown in FIGS. 2 and 3, the screw device 1 includes a retainer 5, a screw member 6 as a fastening member, and a head 7.

  As shown in FIGS. 2, 3, and 5, the retainer 5 is made of a metal member having a substantially cylindrical shape, for example. For example, a clinching fastener 10 is provided at the distal end portion of the retainer 5 as a coupling portion for coupling to the assembly component 102. The outer diameter of the clinching fastener 10 is slightly larger than the screw insertion hole 104 formed in the assembly component 102. The clinching fastener 10 is press-fitted in a state where the clinching fastener 10 is positioned with respect to the screw insertion hole 104, so that the tip of the retainer 5 can be coupled to the assembly component 102. When the clinching fastener 10 is thus coupled, the retainer 5 is suspended from the assembly component 102, and the internal space 11 of the retainer 5 is communicated with the screw insertion hole 104.

  In addition, on the proximal end side of the retainer 5, for example, an annular inward flange portion 12 that protrudes in the inner circumferential direction is provided as an engaged protrusion to which a screw member 6 described later can be engaged.

  Further, a concave portion having an inner diameter smaller than the inner diameter φr0 on the distal end side of the retainer 5 is formed at the proximal end portion of the inward flange portion 12, and this concave portion is set as the spring receiving chamber 13.

  As shown in FIGS. 2, 3, and 6, the screw member 6 is formed of a metal member having a shaft portion 20 that is smaller in diameter than the effective inner diameter of the retainer 5 (that is, the inner diameter φr <b> 1 of the inward flange portion 12 of the retainer 5). Has been. A male screw portion 21 as a fastening portion that can be screwed into a female screw portion 103 formed in the main body part 101 is engraved on the distal end side of the shaft portion 20. In the present embodiment, the outer diameter φc1 of the male screw portion 21 is set to be smaller than the outer diameter φc0 of the shaft portion 20, but is set to be substantially the same as the outer diameter φc0 of the shaft portion 20. Is also possible.

  Further, in the middle of the shaft portion 20, the base end portion of the male screw portion 21 is, for example, an annular protrusion protruding in the outer peripheral direction as an engaging protrusion that can be engaged with the distal end side of the inward flange portion 12 of the retainer 5. The outward flange portion 22 is provided.

  On the other hand, a clinching fastener 23 is provided on the proximal end side of the shaft portion 20 as a coupling portion with respect to the head portion 7. A protrusion 24 having a substantially cylindrical shape with a diameter smaller than that of the shaft portion 20 is provided on the base end side of the clinching fastener 23, and a temporary protrusion made of, for example, an annular protrusion is formed on the outer periphery of the protrusion 24. A locking piece 25 for stopping is projected.

  The shaft portion 20 of the screw member 6 is loosely inserted into the internal space 11 of the retainer 5 by inserting the proximal end side (clinching fastener 23 side) from the distal end side of the retainer 5. As a result, the screw member 6 can move in the axial direction relative to the retainer 5, move in the direction perpendicular to the axis within a predetermined range, and tilt in the predetermined range. Can be moved (oscillated). The amount of movement allowed in the direction perpendicular to the axis of the screw member 6 and the amount of movement allowed in the tilting direction with respect to the retainer 5 are determined based on the diameter of each part of the retainer 5 and the screw member 6. It is. In the present embodiment, for example, the outer diameter φc2 of the outward flange portion 22 of the screw member 6 is set to 5.50 [mm] with respect to the inner diameter φr0 of the retainer 5 = 6.60 [mm]. Further, the inner diameter φr1 of the inward flange portion 12 of the retainer 5 is set to be 4.80 [mm], and the outer diameter φc0 of the shaft portion 20 of the screw member 6 is set to 3.70 [mm].

  As shown in FIGS. 2 to 4, the head 7 is made of, for example, a metal member having a substantially cylindrical shape having an outer diameter φh <b> 0 that is substantially the same as the outer diameter φr <b> 2 of the retainer 5. A hole 30 into which the clinching fastener 23 of the screw member 6 can be press-fitted is recessed at the center of the front end surface of the head 7. Further, on the inner peripheral surface of the hole portion 30, for example, a spiral concave groove 31 is engraved as a receiving portion capable of locking the temporary locking locking piece 25 of the screw member 6.

  Further, a concave portion having an annular shape coaxial with the hole portion 30 is formed on the distal end surface of the head portion 7, and this concave portion is set as a spring receiving chamber 32.

  A knurled portion 33 is provided on the outer peripheral surface of the head 7. Further, a plus groove 34 is provided on the base end surface of the head 7.

  A clinching fastener 23 of the screw member 6 that is loosely passed through the retainer 5 is press-fitted into the hole 30 of the head 7. Thereby, the front end surface of the head 7 is opposed to the base end surface of the retainer 5 so as to be able to contact and separate, and the screw member 6 is prohibited from dropping from the retainer 5.

  Further, as shown in FIGS. 2 and 3, a return spring 40 is interposed between the spring receiving chamber 13 provided in the retainer 5 and the spring receiving chamber 32 provided in the head 7. The return spring 40 is for urging the retainer 5 toward the distal end side with respect to the head 7. When the retainer 5 is urged by the urging force of the return spring 40, no external force is applied. In the natural state, the retainer 5 advances to a position where the inward flange portion 12 contacts the outward flange portion 22 of the screw member 6, and accommodates substantially the entire area of the male screw portion 21 in the internal space 11 (see FIG. 2).

  Next, an example of a method for assembling the screw device 1 having such a configuration will be described with reference to FIG.

  As shown in FIG. 7A, in the assembly of the screw device 1, first, the shaft portion 20 of the screw member 6 is loosely penetrated with respect to the retainer 5, and a return is made between the retainer 5 and the head 7. With the spring 40 interposed, the temporary locking locking piece 25 of the screw member 6 is locked in the concave groove 31 of the head 7. Thereby, the retainer 5, the head 7, and the return spring 40 are temporarily assembled with respect to the screw member 6.

  Next, for example, as shown in FIG. 7B, the head 7 of the temporarily assembled screw device 1 is set on the pedestal 51, and the distal end side of the screw member 6 is pressed to the proximal end side with a predetermined pressure. .

  As a result, as shown in FIG. 7C, the clinching fastener 23 provided on the base end side of the screw member 6 is press-fitted into the inner periphery of the hole 30 of the head 7, and the screw member 6 is inserted into the head 7. Connected to Thereby, the screw device 1 is assembled.

  Next, an example of an assembly procedure of the assembly component 102 to the main body component 101 using the screw device 1 having such a configuration will be described with reference to FIG.

  First, in the procedure for assembling the assembly component 102 with respect to the main body component 101, the retainer 5 is positioned coaxially with respect to the screw insertion hole 104 of the assembly component 102. In this state, when the proximal end side of the retainer 5 is pressed directly or indirectly through the head 7, the clinching fastener 10 is press-fitted into the inner periphery of the screw insertion hole 104, and the retainer 5 is Coupled to the assembly part 102. (That is, the screw device 1 is attached to the assembly component 102). Then, as shown in FIG. 8A, the screw insertion hole 104 of the assembly component 102 to which the screw device 1 is attached and the female screw portion 103 of the main body component 101 are aligned.

  At this time, in the example shown in FIG. 8A, due to processing errors, assembly errors, and the like of the parts 101 and 102, between the central axis O1 of the male screw portion 21 and the central axis O2 of the female screw portion 103. Although the deviation is low, as shown in FIG. 8 (b), by moving the screw member 6 (and the head 7) relative to the retainer 5, the central axis O1 is coaxial with the central axis O2. Placed in.

  Then, as shown in FIG. 8C, the male screw portion 21 is screwed into the female screw portion 103 when the head portion 7 is rotated. The assembled part 102 is fastened and fixed to the main body part 101 by bringing the distal end face of the head 7 into contact with the proximal end face of the retainer 5 by this screwing.

  According to such an embodiment, the cylindrical retainer 5 having the clinching fastener 10 at the distal end portion and the inward flange portion 12 on the proximal end side, and the shaft portion 20 loosely passed through the inner space of the retainer 5. A screw member 6 having a male screw portion 21 on the tip end side thereof and an outward flange portion 22 engageable with the tip end side of the inward flange portion 12 in the middle of the shaft portion 20, and a base of the shaft portion 20 of the screw member 6. The screw device 1 is configured to include the head portion 7 connected to the end side and capable of contacting the base end surface of the retainer 5, thereby sufficiently securing the freedom of movement of the screw member 6 in the radial direction. Therefore, it is possible to prevent the screw member 6 from dropping off from the assembly component 102 and to improve workability during the fastening operation.

  That is, the screw member 6 is held by the assembly component 102 via the retainer 5. The inward flange portion 12 provided on the proximal end side of the retainer 5 and the outward flange portion 22 provided in the middle of the screw member 6. Therefore, it is possible to prevent the screw member 6 from moving in the radial direction without taking measures such as making the outer diameters of the shaft portion 20 and the male screw portion 21 greatly different. It can be secured sufficiently.

  Moreover, since the screw device 1 of this embodiment is a structure which attaches the screw member 6 to the assembly | attachment component 102 via the retainer 5, alignment before fastening the assembly | attachment component 102 with respect to the main body component 101, etc. During the work, the male screw portion 21 can be retracted into the internal space 11 of the retainer 5 without greatly projecting to the main body component 101 side, so that the workability due to the male screw portion 21 interfering with the main body component 101 is improved. A drop, damage to the main body part 101, etc. can be prevented accurately.

  The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.

  For example, in the above-described embodiment, the screw device 1 that performs fastening by screwing using the male screw portion 21 has been described as an example of the fastening device, but the present invention is not limited to this, for example, Of course, the present invention can also be applied to a fastening device that performs fastening by latching using a latching portion having a predetermined shape.

  Further, for example, in the above-described embodiment, an example of the configuration in which the return spring 40 is interposed between the retainer 5 and the head 7 has been described, but the present invention is not limited to this, and the return spring is not limited thereto. 40 can be omitted as appropriate.

  Moreover, in the above-mentioned embodiment. Although an example in which the clinching fastener 10 is used as a coupling portion with respect to the assembly component 102 has been described, the present invention is not limited to this example. For example, as shown in FIG. The connecting portion may be configured by the above, and further, for example, as shown in FIG.

  In the above-described embodiment, an example in which the plus groove 34 is provided in the head 7 has been described. However, the present invention is not limited to this, and for example, a hexagon hole for a hexagon wrench or a minus It is also possible to provide grooves, Torx (registered trademark) or other specially shaped holes.

  Moreover, in the above-mentioned embodiment, although the example using the cyclic | annular inward flange part 12 and the outward flange part 22 as an engaged protrusion and an engagement protrusion was demonstrated, this invention is not limited to this. For example, either one of the engaged protrusions or the engaging protrusions can be constituted by a plurality of projecting piece parts extending radially, and the other can be constituted by an annular flange part or the like.

  Further, as described in the above embodiment, the retainer 5 is preferably a cylindrical member having a substantially cylindrical shape as a basic shape, but the present invention is not limited to this, and for example, a square tube It can also be formed into a shape or the like.

  Furthermore, the screw device 1 or the like of the present invention is not limited to application to an assembly part or the like of a housing of an electronic device, and can of course be applied to various assembly parts. .

1 ... Screw device (fastening device)
5 ... Retainer 6 ... Screw member (fastening member)
7 ... Head 10 ... Clinching fastener (joint)
11 ... Internal space 12 ... Inward flange (engaged protrusion)
13 ... Spring receiving chamber 20 ... Shaft portion 21 ... Male thread portion (fastening portion)
22 ... Outward flange (engagement protrusion)
DESCRIPTION OF SYMBOLS 23 ... Clinching fastener 24 ... Projection part 25 ... Temporary stop locking piece 30 ... Hole part 31 ... Concave groove 32 ... Spring receiving chamber 33 ... Knurling part 34 ... Positive groove 40 ... Return spring 51 ... Base 55 ... Cylindrical shape Part (joint part)
56… Welding base (joint part)
101 ... Body parts (other parts)
102 ... Assembly part 103 ... Female thread part 104 ... Screw insertion hole

Claims (6)

A cylindrical retainer having a coupling portion that can be coupled to an assembly component that is assembled to another component by fastening at the distal end portion and an engaged projection projecting in the inner circumferential direction on the base side;
A fastening member having a fastening portion on the distal end side of the shaft portion loosely penetrated in the internal space of the retainer and having an engaging projection that can be engaged with the distal end side of the engaged projection in the middle of the shaft portion When,
A head that is spaced apart from the engagement protrusion and connected to the proximal end of the shaft portion of the fastening member, and capable of contacting the proximal end surface of the retainer ,
The fastening device is characterized in that the fastening member is connected to the head portion by press-fitting a proximal end side of the shaft portion loosely penetrated into an internal space of the retainer.   The fastening device according to claim 1, wherein a return spring that urges the head in a direction away from the retainer is interposed between the retainer and the head.   The fastening device according to claim 1, wherein the head has a knurled portion on an outer peripheral surface.   The fastening device according to any one of claims 1 to 3, wherein the coupling portion is configured by a clinching fastener.   The fastening device according to any one of claims 1 to 3, wherein the coupling portion is configured by a cylindrical portion that can be flared.   The fastening device according to any one of claims 1 to 3, wherein the coupling portion is configured by a welding base that can be welded to the assembly component.

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