JP2007162878A - Fastening mechanism and fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening mechanism and a fastening device facilitating replacement of a screw or an elastic member by attachment and detachment of the screw, by properly retaining an attitude of the screw with respect to a mounting object, and improving workability of screw fastening work. <P>SOLUTION: The fastening mechanism is a screw mechanism fastening a chassis 2 and a mounting board 4 by the screw 5. A screw hole 8 corresponding to a screw hole 3 of the chassis 2 is opened in the mounting board 4, a screw supporting part 6 is formed on the mounting board 4, a hole 12 for operating the screw 5 is opened in the screw supporting part 6, a tip of the screw 5 is screwed into the screw hole 8, a head of the screw 5 is positioned in the hole 12, a washer part 17 is provided on the head of the screw 5, and a coil spring 7 is arranged between the washer part 17 and the mounting board 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fastening mechanism and a fastening device for fixing an object to each other with a fastening member such as a screw, for example, and more particularly to a fastening mechanism suitable for attaching and detaching an aluminum material or an iron material.

  Conventionally, as a fastening mechanism that prevents a screw for assembling objects from falling off, a screwing structure described in Japanese Utility Model Laid-Open No. 5-58932 or a screwing mechanism shown in FIG. 7 is known.

  In the screwing structure disclosed in Japanese Utility Model Laid-Open No. 5-58932, a leg projecting toward the object is provided on the detachable member that contacts the object to be attached, and a screw-through hole is formed between the legs of the detachable member. The screw shaft is passed through the hole. In addition, the elastic member is also passed between the edge of the screw-through hole of the detachable member and the head of the screw, and one end of the elastic member is fixed near the screw head, and the other end of the elastic member is fixed to the screw itself. It touches the edge of the screw hole. In this screw-fastening structure, the screw portion of the shaft portion of the screw is screwed through the screw through hole so that the screw does not fall off from the removable member so that the screw does not fall off from the screw through hole of the removable member.

Further, in the screwing structure shown in FIG. 7, the mounting base 40 and the chassis 41 that is an attachment target are coupled, and the mounting base 40 is provided with a screw hole 42 and a screw hole 43. A screw hole 44 is formed in the chassis 41. A screw support 45 is fixed to the mounting base 40, and a screw 46 for fixing the screw support 45 to the mounting base 40 is passed through a through hole 45 </ b> A in the screw support 45. It is screwed into the hole 42. A screw through hole 47 is formed in the screw support portion 45, and a screw 49 for fixing the entire fastening device 48 to the chassis 41 is passed through the screw through hole 47, and a tip portion of the screw 49 is a screw hole 44 of the mounting base 40. It is to be screwed on. A retaining ring 50 is provided at an intermediate portion of the screw 49 so that the screw 49 is not removed from the screw through hole 47.
Japanese Utility Model Publication No. 5-58932

  However, the above-described screw tightening structure disclosed in Japanese Utility Model Laid-Open No. 5-58932 uses a special screw as the tightening screw, which increases costs and makes it difficult to replace the screw and the elastic member. .

  In the conventional example of Patent Document 1 above, since one end of the elastic member is fixed to the screw shaft, the screw is not held perpendicular to the mounting base, so the screw is difficult to align with the screw hole of the attachment object, There is a problem that it is difficult to align the screwdriver with the screw head and workability is poor.

  In addition, when replacing screws, there is a problem in that it takes time to remove and assemble the elastic member and the screw, and a hole for attaching the elastic member must be provided in the screw, resulting in an increase in cost.

  In the structure shown in FIG. 7, the screw 49 may protrude from the mounting base 40 toward the attachment object 41, so that the screw 49 hits the attachment object 41 and is scratched, unevenness of the attachment object 41, etc. Therefore, the screw may be caught and the screw 49 may be difficult to align with the screw hole 44 of the attachment object 41. In addition, since the screw 49 is held in the screw through hole 47 in a free state and cannot be maintained in a vertical state, not only is it necessary to search for the screw hole 44 but to align the screw 49 with the screw hole 44. There is also a problem that it is difficult to engage the screwdriver 51 with the screw 49 and the workability is poor. Further, the retaining ring 50 must be mounted after the screw 49 is inserted into the threaded hole 47, and it takes time to remove and assemble in replacing the screw 49, and a groove for attaching the retaining ring 50 to the screw 49 is provided. There was a problem that it was necessary to increase the cost.

  The present invention has been made paying attention to such a problem. The screw posture is appropriately maintained with respect to the attachment object to improve the workability of the screw tightening work. An object of the present invention is to provide a fastening mechanism and a fastening device in which replacement of members is easy.

  In order to solve the above-described problem, the fastening mechanism according to claim 1 of the present application causes the mounting base to contact the mounting target directly or indirectly, and fastens the mounting base and the mounting target to each other by a fastening member. A fastening mechanism for fixing the mounting base, wherein a second hole corresponding to the first hole for fastening formed in the mounting target is formed in the mounting base, and the mounting base is opposite to the mounting target. A support portion for supporting the fastening member is provided at the portion, and a third hole is formed in the support portion so as to face the second hole, and the distal end portion on the insertion side of the fastening member is disposed on the second portion. The head on the operation side of the fastening member is positioned on the mounting substrate side of the third hole, and the head of the fastening member can be brought into contact with the peripheral portion of the third hole. A washer is provided, and one end of the washer is between the washer and the mounting base. Supported and the other end to the part side, characterized in that the fastening member when the washer portion is deployed elastic member for resiliently urging the support part side.

  The fastening mechanism according to claim 2 of the present application is the fastening mechanism according to claim 1, wherein the distance between the mounting base and the support is such that the other end of the fastening member does not protrude from the mounting base toward the attachment object. It is characterized by having.

  A fastening mechanism according to a third aspect of the present invention is characterized in that, in the fastening mechanism according to any one of the first and second aspects, the support portion can be fixed to and detached from the mounting base portion by a fixing member.

  The fastening mechanism according to claim 4 of the present application is characterized in that in the fastening mechanism according to any one of claims 1 to 3, the washer portion is formed integrally with the fastening member.

  The fastening device according to claim 5 of the present application has a mounting base that abuts in the vicinity of the first screw hole formed in the attachment object, and a screw that penetrates the mounting base is screwed into the first screw hole. A fastening device for coupling the mounting object and the mounting base, wherein a second screw hole for passing the screw is formed in the mounting base, and a part of the mounting base opposite to the mounting target A support portion for supporting the screw head portion, a third hole for operating the screw head portion in the support portion, and a screw shaft portion of the screw in the second hole. And a washer that can be brought into contact with the peripheral edge of the third hole at the head of the screw, and the screw is urged toward the support between the washer and the mounting base. An elastic member is provided.

  According to the fastening mechanism of claim 1 of the present invention, the one end of the fastening member is positioned on the support portion of the mounting base, the other end of the fastening member is positioned in the second hole of the mounting base, and the elastic member Since the fastening member is biased so as to press against the support portion side, the fastening work can be performed while maintaining the posture for fastening the fastening member, and workability is improved.

  According to the fastening mechanism of claim 2 of the present invention, the distance between the mounting base and the support is such that the other end of the fastening member does not protrude from the mounting base toward the mounting object. When the mounting base is applied to the object, the other end of the fastening member does not hit the surface of the object to be attached, so that the surface of the object to be attached is prevented from being damaged or the posture of the fastening member is prevented from being bent. Can be performed promptly.

  According to the fastening mechanism of claim 3 of the present invention, since the support portion is made removable from the mounting base, the fastening member and the elastic member can be removed by removing the support portion from the mounting base. The workability of the fastening work of the fastening member is improved, and the fastening member and the elastic member can be easily exchanged.

  According to the fastening mechanism of claim 4 of the present invention, since the washer part is integrally formed with the fastening member, the work of attaching the washer part is not required, and the workability is improved.

  According to the fastening device of the fifth aspect of the present invention, the one end of the screw is positioned on the support portion of the mounting base, the other end of the screw is positioned in the second hole of the mounting base, and the screw is fixed by the elastic member. Since it is urged | biased so that one end part may be pressed on the support part side, a fastening operation | work can be performed, maintaining the attitude | position for the fastening of a screw | thread, and workability | operativity improves.

  Hereinafter, a fastening mechanism and a fastening device according to the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a screw fastening mechanism and a screw fastening device according to an embodiment of the present invention. Reference numeral 1 is a fastening device, and 2 is a chassis as an attachment object. A screw hole 3 (first hole) is formed in the chassis 2. The fastening device 1 includes a mounting substrate 4 (mounting base) that contacts the surface of the chassis 2, screws 5 that serve as fastening members to the chassis 2, screw support portions 6 that support the screws 5, and coil springs that serve as elastic members. 7. A screw hole 8 (second hole) corresponding to the screw hole 3 and a screw hole 9 are formed in the mounting substrate 4. A screw thread of the screw 5 is screwed into the screw hole 8.

  The screw 5 is a plain washer built-in screw. A washer portion 17 is formed integrally with the head portion 5 </ b> A of the screw 5. A cross-shaped fitting groove for fitting the cross-shaped cutting edge of the driver 13 is formed in the head 5A.

  The screw support portion 6 includes a base portion 6 </ b> A that contacts the mounting substrate 4 and a support plate portion 6 </ b> B that is connected to the base portion 6 </ b> A and extends parallel to the mounting substrate 4. A through hole 11 through which the fixing screw 10 is passed is formed in the base 6A. When the fixing screw 10 is passed through the through hole 11 and fastened to the screw hole 9, the screw support 6 is fixed to the mounting substrate 4. A hole 12 (third hole) into which the head portion 5A of the screw 5 is inserted is formed in the support plate portion 6B, and the blade edge of the driver 13 can be inserted into the hole 12.

  The mounting board 4 is usually composed of a casing of unit parts or the like, and a screw hole 14 is formed in the mounting board 4. A bush 15 is screwed into the screw hole 14, and the bush 15 can be detached from the mounting substrate 4. The bush 15 is made of, for example, a material having excellent wear resistance obtained by quenching an iron material. Further, the screw support portion 6 is also made of a material having excellent wear resistance in order to prevent wear by the screw 5 or the driver 13. The outer peripheral portion of the portion of the bush 15 protruding from the mounting substrate 4 to the support plate portion 6B side is, for example, a hexagonal nut-shaped portion (not shown), and the bush 15 can be rotated by engaging the spanner with the outer peripheral portion of the bush 15. Since the bush 15 is screwed into the screw hole 14, the elastic force of the coil spring 7 can be adjusted by adjusting the distance e by adjusting the screwing position of the bush 15.

  A screw hole 8 as a second hole is formed inside the bush 15. A cylindrical step portion 16 is formed in the upper portion of the screw hole 14 of the bush 15. The diameter a of the step portion 16 is set to be larger than the diameter b of the screw hole 8 so that the lower end portion of the coil spring 7 can be supported by the step portion 16. The upper end portion of the coil spring 7 is applied to a washer portion 17 formed around the head portion 5 </ b> A of the screw 5, and the coil spring 7 biases the screw 5 in a direction in which the screw 5 is separated from the chassis 2. The coil spring 7 holds the screw 5 by pushing the washer portion 17 of the screw 5 toward the screw support portion 6 in a state where the screw 5 is removed from the chassis 2.

  When the screw 5 is not screwed into the screw hole 3 of the chassis 2 as shown in FIG. 1, the screw 5 is pushed by the coil spring 7 so that the tip of the screw 5 protrudes from the contact surface of the mounting substrate 4. Instead, when the coil spring 7 is compressed as shown in FIG. 2, the tip of the shaft portion 5 </ b> B of the screw 5 is set so as to reach the back surface from the front surface of the chassis 2.

  That is, as shown in FIG. 1, when the washer portion 17 is in contact with the support plate portion 6 </ b> B, the tip portion when the screw 5 is screwed in is slightly (distance c) from the surface on the chassis 2 side of the mounting substrate 4. Is located. As shown in FIG. 2, the lengths of the screw 5 and the coil spring 7 are such that when the coil spring 7 is sufficiently compressed, the leading end of the screw 5 protrudes from the screw hole 3 to the back surface of the chassis 2. Is set.

  The length of the shaft of the screw 5 requires the distance L, the thickness of the mounting substrate 4 and the thickness of the chassis 2. The displacement amount of the screw 5 is obtained by subtracting the protruding amount e of the bush 15 from the separation distance L between the support plate portion 6B and the mounting substrate 2, and this amount is an amount capable of compressing the coil spring 7.

  The unloaded length of the coil spring 7 is set longer than the separation distance L in order for the coil spring 7 to press the screw 5 against the support plate 6B. The separation distance L is set so that the coil spring 7 installed in the step portion 16 can obtain an elastic force capable of pressing the washer portion 17.

  Note that the stepped portion 16 and the screw hole 8 may be formed directly on the mounting substrate 4 instead of the bush 15. FIG. 3 is an enlarged view of the screw 5, in which a flange serving as a washer 17 is formed on the outer periphery of the head 5A of the screw 5, and a thread S is formed on one end of the screw shaft 5B of the screw 5. Yes.

  When replacing the screw 5 and the coil spring 7, the screw 10 is removed to separate the screw support 6 and the mounting substrate 4, and the screw 5 is removed from the screw hole 8 by the driver 13. Thereby, the screw 5 and the coil spring 7 can be taken out. When the screw 5 and the coil spring 7 are replaced with new ones, the screw 5 is inserted into the coil spring 7 and the screwdriver 13 is turned in the fastening direction to screw the tip end portion of the screw 5 into the screw hole 8. Next, the head 5A of the screw 5 is positioned in the hole 12 of the screw support portion 6 to compress the coil spring 7, and the screw support portion 6 and the mounting substrate 4 are brought into contact with each other. 6 and the mounting substrate 4 are coupled together. Thereby, the fastening device 1 is assembled.

  When the fastening device 1 is assembled to the chassis 2, the screw 5 is applied to the screw hole 3 of the chassis 2 and the driver 13 is turned in the fastening direction. As a result, the screw 5 is screwed into the screw hole 3 and the fastening device 1 and the chassis 2 are firmly fastened.

  The screw hole 8 may be a through hole. When the through hole through which the shaft portion 5B of the screw 5 is passed instead of the screw hole 8, the screw 5 is easily detached by the elastic force of the coil spring 7 when the screw support portion 6 is removed from the mounting substrate 4. At the same time, the assembly of the screw 5 and the coil spring 7 is simple because the screw 5 is simply passed through the hole 8. In addition, since the washer portion 17 is held in the hole 12, when the screw support portion 6 and the mounting substrate 4 are brought into contact with each other, the posture of the screw 5 is not shaken, and assembly is easy.

  FIG. 4 shows an application example in which a mounting substrate 22 is fixed to a recess 21 of a chassis 20 of an electronic device (for example, a copying machine, a printer, a fax machine, etc.) using the fastening mechanism of FIGS. The concave portion 21 of the chassis 20 is, for example, a storage space in which a toner unit and the like are disposed. For this reason, it is necessary to attach and detach the mounting substrate 22 for inspection of the fixing unit and the toner unit.

  At this time, if the screwdriver 13 is inserted into the holes 12 of the left and right fastening devices 1 and the screws 5 are removed from the holes 3 of the chassis 20, the mounting substrate 22 can be removed while the fastening devices 1 are provided. When the screw 5 is worn or the coil spring 7 is sag, if the screw 10 is loosened and the screw support portion 6 is removed from the mounting substrate 22, the screw 5 and the coil spring 7 are detached.

  FIG. 5 shows a screw fastening mechanism and fastening device according to a second embodiment of the present invention. In this embodiment, the structure of the screw support portion 30 is different from that of the first embodiment. The screw support portion 30 includes a cylindrical portion 31 that contacts the mounting substrate 2 and a flange portion 32 that extends laterally from the cylindrical portion 31. A bush 15 is screwed onto the mounting substrate 2 side as in the first embodiment, and a lower end portion of the coil spring 7 is supported by a step portion 16 of the bush 15. The upper end portion of the coil spring 7 is in contact with the flange 33 of the screw 5. A circular operation hole 34 is opened on the upper plate portion of the cylindrical portion 31 of the screw support portion 30, and the flange 33 hits the inner edge of the operation hole 34 so that the screw 5 does not jump out of the cylindrical portion 31. It is like that. Since other configurations are the same as those in FIG. 1, the description thereof is used.

  FIG. 6 shows an example in which a washer 35C is attached to a screw shaft 35A of a screw 35 via a washer 35B. The washer 35C receives the elastic force that the coil spring 7 pushes up, and the washer 35C receives the urging force of the washer 35C by the support plate 6B. The washer 35B prevents loosening when the screw 35 is tightened into the screw hole 8 of the bush 15.

  Although the coil spring 7 is used as the elastic member, a rubber or elastic plastic pipe material may be used instead of the coil spring 7 as the elastic member, or a U-shaped bent plate. It is conceivable to attach a spring. Although the mounting substrate 2 is shown in a plate shape, the mounting substrate 2 is not limited to a plate shape and can be changed in accordance with the surface shape of the mounting object.

  In the above embodiment, a screw is used as the fastening member, but a bolt, a fastener, or the like can be used instead of the screw.

  In the above-described fastening mechanism, the fastening device 1 constitutes a fastening mechanism with the chassis 2 that is the object to be attached, the screw hole 8 corresponding to the screw hole 3 of the chassis 2 is formed in the mounting board 4, and the screw is supported on the mounting board 4. The hole 6 for operating the screw 5 is formed in the screw support portion 6, the tip of the screw 5 is screwed into the screw hole 8, the head of the screw 5 is positioned in the hole 12, and the screw 5 The fastening mechanism is configured by providing the washer portion 17 on the head and arranging the coil spring 7 between the washer portion 17 and the mounting substrate 4. However, the fastening device 1 may be used as a fastening means as a unit. . In this case, the mounting board 4 itself may be a part of the housing, but a mounting part or the like is provided between the screw support 6 and the mounting board 4, or between the mounting board 4 and the chassis 2, or on the screw support 6. May be attached.

It is a figure which shows the fastening mechanism of the screw | thread using the fastening apparatus concerning the 1st Embodiment of this invention. FIG. 2 is a view showing a state where the fastening device of FIG. 1 is fixed to the chassis. FIG. 3 is an enlarged view of the screw. FIG. 4 is a view showing an application example in which the screw fastening mechanism shown in FIGS. FIG. 5 is a diagram showing a second embodiment of the present invention. FIG. 6 is a view showing a modified example of the screw. FIG. 7 is a diagram of a conventional screw fastening mechanism.

Explanation of symbols

1 Fastening device 2 Chassis (object to be mounted)
3 Screw holes (first hole)
4 Mounting board (mounting base)
5 Screw 6 Screw support part (Screw: Fastening member support part)
7 Coil spring (elastic member)
8 Screw hole (second hole)
10 screw 12 hole (third hole)
17 Washer 17

Claims (5)

A fastening mechanism that directly or indirectly contacts a mounting base with the mounting target, and fastens the mounting base and the mounting target together by a fastening member.
A second hole corresponding to the first hole for fastening formed in the mounting object is formed in the mounting base, and the fastening member is supported on a part of the mounting base opposite to the mounting object. And a third hole opposite to the second hole is formed in the support part, and a distal end portion on the insertion side of the fastening member is positioned in the second hole, and the third hole A head portion on the operation side of the fastening member is positioned on the mounting substrate side of the hole, and a washer portion capable of contacting the peripheral edge portion of the third hole is provided on the head portion of the fastening member, and the washer portion An elastic member is provided between the mounting base and an elastic member that elastically biases the fastening member toward the support portion with one end supported on the mounting base and the other end abutted against the washer. Fastening mechanism to do. The fastening mechanism of claim 1,
The fastening mechanism, wherein the mounting base and the support are spaced apart from each other by a distance at which a tip of the fastening member does not protrude from the mounting base toward the attachment object. The fastening mechanism according to any one of claims 1 and 2,
The fastening mechanism is characterized in that the support portion is detachably fixed to the mounting base by a fixing member. In the fastening mechanism according to any one of claims 1 to 3,
The said washer part is integrally formed in the said fastening member. The fastening mechanism characterized by the above-mentioned. A mounting base that abuts in the vicinity of the first screw hole formed in the mounting object; and a screw that penetrates through the mounting base is screwed into the first screw hole to connect the mounting target and the mounting base. A fastening device for joining
Forming a second screw hole through which the screw is passed through the mounting base, and forming a support for supporting the head of the screw at a portion of the mounting base opposite to the attachment object; Forming a third hole for operating the screw head, passing the screw shaft portion of the screw through the second hole, and contacting the periphery of the third hole with the screw head A fastening device, wherein a possible washer portion is provided, and an elastic member for urging the screw toward the support portion is disposed between the washer portion and the mounting base portion.

Images