JP5030004B2 - Washer and screw with washer, fixing structure and fixing method using these, and fixing release method - Google Patents

Description

  The present invention relates to a washer and a screw with a washer, a fixing structure and a fixing method using these, and a fixing releasing method.

  Conventionally, in order to prevent loosening of screws due to environmental factors such as vibration and temperature change, a spring washer is generally used (see, for example, FIG. 5 of Patent Document 1).

Japanese Patent Laid-Open No. 11-280738

  In recent years when electronic devices and other devices are required to be reduced in size and thickness, it is difficult to secure clearances between components. When spring washers are used to prevent loosening of screws, the thickness of the spring washers It has also become an impediment to thinning.

  As another screw loosening prevention measure, there is a method of applying a locking agent to the screw as an alternative to the spring washer. However, since the locking agent is peeled off from the screw when the screw is removed for maintenance of the apparatus or the like, the screw may be loosened by repeated use.

  Further, even when a spring washer is used or when a locking agent is used, there is no prevention / suppression effect against unnecessary screw removal due to mischief or the like.

  It is an object of the present invention to provide a washer and a washer-attached screw capable of preventing loosening of a screw due to environmental factors such as vibration and temperature change, and removal of unnecessary screws due to mischief, and a fixing structure and a fixing method using these. As well as providing a method of unlocking.

The washer according to the present invention is
A washer for fixing a member to be fixed together with a screw and a screw boss screwed into the screw,
A fitting portion that fits into a small diameter portion between the screw head and the screw body;
An elastic piece extending in the tightening direction of the screw from the side edge of the fitting portion;
Having a claw provided at the tip of the elastic piece,
When the screw is screwed into the screw boss and tightened while the elastic piece is inserted into the through hole of the fixed member, the claw can be locked in a locking groove provided on the side surface of the screw boss. It is characterized by being.

The screw with a washer according to the present invention is
A screw with a washer used for a fixing structure in which a fixed member is sandwiched between a screw and a screw boss and the screw is screwed to the screw boss to fix an object to be fixed.
Including a washer fitted in a small diameter portion between the screw head and the screw body;
The washer is an elastic piece extending in a tightening direction of the screw from a side edge of a fitting portion with the screw;
It has a claw provided at the tip of the elastic piece,
When the elastic piece of the washer is inserted into the through hole of the fixed member and the screw is screwed into the screw boss and tightened, the claw is locked in a locking groove provided on a side surface of the screw boss. It is possible.

The fixing structure according to the present invention is:
A fixing structure for fixing a member to be fixed by a screw, a washer, and a screw boss screwed to the screw;
The washer includes a fitting portion that fits into a small-diameter portion between the screw head and the screw body, an elastic piece that extends in a tightening direction of the screw from a side edge of the fitting portion, and the elastic piece. A claw provided at the tip of the
The screw boss has a locking groove provided on the side surface for locking the claw,
The fixed member has a through hole for inserting the elastic piece,
When the screw with the washer is screwed into the screw boss with the member to be fixed interposed therebetween, the screw is tightened while inserting the elastic piece of the washer into the through hole of the member to be fixed, and the claw is It is characterized by being locked in the locking groove.

The fixing method according to the present invention comprises:
A screw, a washer, and a screw boss threadedly engaged with the screw, wherein the washer is fitted into a small-diameter portion between the screw head and the screw body; A locking groove having an elastic piece extending from the edge in the tightening direction of the screw and a claw provided at the tip of the elastic piece, and the screw boss is provided on a side surface of the claw for locking the claw. A fixing method in a fixing structure in which the screw to which the washer is attached is screwed to and tightened to the screw boss with the fixed member interposed therebetween,
Inserting the elastic piece of the washer into the through hole of the fixed member;
And locking the claw in the locking groove while tightening the screw.

The unlocking method according to the present invention comprises:
A screw, a washer, and a screw boss threadedly engaged with the screw, wherein the washer is fitted into a small-diameter portion between the screw head and the screw body; A locking groove having an elastic piece extending from the edge in the tightening direction of the screw and a claw provided at the tip of the elastic piece, and the screw boss is provided on a side surface of the claw for locking the claw. And the fixed member has a through hole for inserting the elastic piece, and when the screw with the washer is screwed into the screw boss with the fixed member interposed therebetween, The elastic piece of the washer is inserted into the through hole of the fixed member and the screw is tightened to lock the claw into the locking groove, and the elastic piece has a portion facing the side surface of the screw boss. , A convex portion for warping the elastic piece toward the outside of the diameter of the screw boss A unlocking method in provided comprising fixed structure,
Inserting a jig for releasing the locking state of the claw into the locking groove into a facing portion between the convex portion and the side surface of the screw boss;
And a step of releasing the screwing of the screw with respect to the screw boss.

  According to the present invention, when the elastic piece of the washer attached to the screw is inserted into the through hole of the fixed member, the fixed member is sandwiched and screwed into the screw boss, and the screw is tightened, the tip of the elastic piece of the washer is tightened Since the claw is locked in the locking groove of the screw boss, it is possible to prevent loosening due to environmental factors such as vibration and temperature change without using a spring washer or a locking agent.

  In addition, according to the present invention, the height of the portion exposed on the surface of the fixed object is reduced by the amount that the spring washer is not required, so that the mounting efficiency in the thickness direction of the device can be further increased. . Furthermore, according to the present invention, since the screw cannot be loosened or removed unless a dedicated jig is used, there is an effect that unnecessary removal of the screw due to mischief or the like can be prevented.

It is a perspective view for showing a fixed structure by an embodiment of the invention. FIG. 2 is an exploded perspective view of FIG. 1. It is a disassembled perspective view of the screw with a washer by embodiment of this invention. FIG. 4 is a cross-sectional view of a state in which the object to be fixed 2 is brought into contact with the top surface of the screw boss 1 in order to fix the object to be fixed 2 by screwing the screw with washer 3 shown in FIG. 3 into the screw boss 1. It is sectional drawing of the state which started the screwing to the screw boss 1 of the screw 3 with a washer shown in FIG. It is sectional drawing of the state which completed the screwing to the screw boss | hub 1 of the screw 3 with a washer shown in FIG. It is an external appearance perspective view of the exclusive jig | tool 4 used when loosening and removing the screw 3 with a washer shown in FIG. FIG. 8 is an external perspective view showing a state where insertion of the dedicated jig 4 shown in FIG. 7 into the jig through hole 32d of the washer 32 is started. FIG. 8 is a cross-sectional view of a state where insertion of the dedicated jig 4 shown in FIG. 7 into the jig through hole 32d of the washer 32 is started (corresponding to the cross-sectional view of FIG. 8). FIG. 8 is a cross-sectional view showing a state where the dedicated jig 4 shown in FIG. 7 is inserted into the jig through hole 32d of the washer 32 and the insertion is completed, and the locking state of the locking claw 32b is released. It is a disassembled perspective view of the screw 5 with a washer (application of the washer 52 from which the jig through hole 32d is removed) according to another embodiment of the present invention. It is a disassembled perspective view which shows the detail of the screw 5 with a washer of FIG. It is a disassembled perspective view for demonstrating the screw 7 with a washer by other embodiment of this invention. It is a disassembled perspective view which shows the detail of the screw 7 with a washer of FIG. It is a perspective view for demonstrating other embodiment of the washer by this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, a description will be given with reference to FIGS. 1 is a perspective view illustrating a fixing structure according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a view of a screw with a washer according to an embodiment of the present invention. It is a disassembled perspective view.

  The fixing structure of the present embodiment includes a screw boss 1, a fixed object 2, and a washer-attached screw 3. The screw boss 1 has a screw hole 11 on its top surface and a locking groove 12 on its side wall. A screw 31 is inserted into the screw hole 11 of the screw boss 1 so as to be screwed together. The fixed object 2 includes a screw through hole 21 for allowing a screw to pass therethrough and a locking claw through hole 22 for allowing a locking claw 32b described later to pass therethrough.

  As shown in the exploded perspective view of the screw 3 with washer in FIG. 3, the screw 3 with washer is composed of a screw 31 and a washer 32. The washer 32 is fitted to the small diameter portion of the screw head of the screw 31 and the screw body at the fitting portion (see FIG. 5), and the fastening direction of the screw 31 from the side edge of the fitting portion, That is, two elastic pieces 32a are provided so as to extend in parallel with the screw tightening direction, and a locking claw 32b is provided at the tip of each elastic piece 32a.

  Further, an unlocking convex portion 32c, which will be described later, is provided in the middle of the elastic pieces 32a. A jig through hole 32d, which will be described later, is provided at the base of the elastic piece 32a, that is, the fitting portion of the washer 32 with the screw 31.

  Referring to FIGS. 4 to 6, the state of fastening of the screw 3 with a washer of the present embodiment to a fixed object is represented by a cross-sectional view. FIG. 4 is a cross-sectional view of a state in which the fixed object 2 is brought into contact with the top surface of the screw boss 1 in order to fasten the screw 3 with a washer to the screw boss 1 and fix the fixed object 2.

  FIG. 5 is a cross-sectional view of a state in which fastening is started while the screw 3 with a washer is inserted through and screwed into the screw hole of the screw boss 1. FIG. 6 is a cross-sectional view of a state where the screw 3 with the washer is screwed onto the screw boss 1 to complete the tightening.

  As shown in FIG. 4, the fixed object 2 is brought into contact with the top surface of the screw boss 1, and the center of the screw hole 11 of the screw boss 1 and the screw through hole 21 of the fixed object 2 is aligned. Then, as shown in FIG. 5, the screw 31 is inserted into the screw through hole 21 of the fixed object 2, and the locking claw 32 b of the washer 32 is passed through the locking claw through hole 22 of the fixed object 2. Tightening is started by screwing into the screw hole 11 of the screw boss 1.

  When the screw 3 with the washer is tightened, as shown in FIG. 6, the locking claw 32b of the washer 32 reaches the locking groove 12 of the screw boss 1, and the locking groove 12 of the screw boss 1 is caused by the elastic force of the elastic piece 32a. Will be locked.

  By doing so, loosening due to environmental factors such as vibration and temperature change can be prevented without using a spring washer or locking agent. Moreover, the mounting efficiency in the thickness direction of the apparatus can be further increased by reducing the height of the portion exposed on the surface of the fixed object by the amount that the spring washer is unnecessary. Furthermore, since the screws cannot be loosened or removed unless a dedicated jig is used, unnecessary screw removal due to mischief or the like can be prevented.

  Next, with reference to FIGS. 7-10, the case where a screw is loosened is demonstrated. FIG. 7 is an external perspective view of the dedicated jig 4 used when the screw 3 with washer is loosened or removed. FIG. 8 is an external perspective view showing a state where insertion of the dedicated jig 4 into the jig through hole 32d of the washer 32 is started.

  FIG. 9 is a cross-sectional view showing a state where insertion of the dedicated jig 4 into the jig through hole 32d of the washer 32 is started. FIG. 10 is a cross-sectional view of the state where the insertion of the dedicated jig 4 into the jig through hole 32d of the washer 32 is completed and the locking claw 32b is unlocked. Of course, the dedicated jig 4 is provided with the same number of locking release rods 41 through the jig through hole 32d of the washer 32 at the same position as the jig through hole 32d.

  In order to loosen the screw, first, the locking release rod 41 of the dedicated jig 4 of FIG. 8 is passed through the jig through hole 32d of the washer 32. Then, as shown in FIG. 9, when the dedicated jig 4 is pushed along the screw boss 1 in the screw tightening direction, the lock release rod 41 comes into contact with the lock release convex portion 32 c.

  Further, when the dedicated jig 4 is pushed in, as shown in FIG. 10, the locking release rod 41 warps the elastic piece 32 a toward the outer side of the diameter of the screw boss 1. Therefore, the convex portion 32 c has a function for warping the elastic piece 32 a in the outer direction of the diameter of the screw boss 1. Thus, the locking state of the locking claw 32b to the locking groove 12 is released. In this state, the washer-attached screw 3 can be loosened in the same manner as a normal screw.

  In the above-described embodiment, the structure after considering the disassembly after screw fastening is taken into consideration. However, in the case of an application in which the object to be fixed is continuously fixed without assuming the disassembly, FIG. 11 and FIG. As shown in FIG. 12, it can be realized by adopting a structure in which the dedicated jig 4 cannot be used. FIG. 11 is an exploded perspective view of an embodiment in which the washer-attached screw 5 to which the washer 52 from which the jig through hole 32d is deleted is applied. FIG. 12 is a detailed view of the screw 5 with a washer in FIG.

  In the washer 52 in this example, the lock release rod 41 provided in the dedicated jig 4 cannot be inserted by deleting the jig through hole 32d provided in the fitting portion of the washer 32 with the screw. The tab 52b remains locked in the locking groove 12, and it becomes impossible to remove the screw permanently.

  In the previous embodiment, the washer 32 includes two elements, each of the elastic piece 32a, the locking claw 32b, the locking release convex portion 32c, and the jig through hole 32d. Of course, the number is not limited to this. 13 and 14 show an embodiment having three of each of these elements.

  FIG. 13 is an exploded perspective view of an embodiment to which a washer-attached screw 7 having three each of these elements is applied. FIG. 14 is a detailed view of the screw 7 with a washer in FIG. In this embodiment, the washer 72 includes an elastic piece 72a, a locking claw 72b, a locking release projection 72c, and three jig through holes 72d. Accordingly, the same number of locking claw through holes 62 is provided in the fixed object 6.

  Further, in the embodiment described above, it is in the form of a screw with a washer. However, as shown in FIG. 15, by providing a notch 91 in the screw fitting portion of the washer 9, The washer of the present invention can also be applied to the (commercially available) screw 8. That is, if a small-diameter portion between the screw head of the general screw 8 and the screw body is introduced into the notch 91 of the washer as shown by the arrow in FIG. 15, it is equivalent to the screw with the washer according to the present invention. It is clear that

1 Screw boss 2,6 Fixed object 3, 5, 7 Screw with washer
4 Dedicated jig 11 Screw hole 12 Locking groove 31 Screw 32 Washer 32a Elastic piece 32b Claw 32c Unlocking convex part 32d Jig through hole

Claims (15)

A washer for fixing a member to be fixed together with a screw and a screw boss screwed into the screw,
A fitting portion that fits into a small diameter portion between the screw head and the screw body;
An elastic piece extending in the tightening direction of the screw from the side edge of the fitting portion;
Having a claw provided at the tip of the elastic piece,
When the screw is screwed into the screw boss and tightened while the elastic piece is inserted into the through hole of the fixed member, the claw can be locked in a locking groove provided on the side surface of the screw boss. A washer characterized by being.   The washer according to claim 1, wherein a plurality of the elastic pieces and the claw are provided.   The convex part for curving the said elastic piece toward the outer side of the diameter of the said screw boss is provided in the part which opposes the side surface of the said screw boss of the said elastic piece. Washer.   The fitting portion is provided with an insertion hole for inserting a jig for releasing the locking state of the claw into the locking groove into a portion facing the convex portion and the side surface of the screw boss. The washer according to claim 3, wherein the washer is provided.   The washer according to any one of claims 1 to 4, wherein the fitting portion is provided with a notch into which a small diameter portion of the screw can be introduced. A screw with a washer used for a fixing structure in which a fixed member is sandwiched between a screw and a screw boss and the screw is screwed to the screw boss to fix an object to be fixed.
Including a washer fitted in a small diameter portion between the screw head and the screw body;
The washer is an elastic piece extending in a tightening direction of the screw from a side edge of a fitting portion with the screw;
It has a claw provided at the tip of the elastic piece,
When the elastic piece of the washer is inserted into the through hole of the fixed member and the screw is screwed into the screw boss and tightened, the claw is locked in a locking groove provided on a side surface of the screw boss. A screw with a washer, characterized in that it is possible.   The screw with a washer according to claim 6, wherein a plurality of the elastic pieces and the claw are provided.   The convex part for curving the said elastic piece toward the outer side of the diameter of the said screw boss is provided in the part facing the side surface of the said screw boss of the said elastic piece, The Claim 6 or 7 characterized by the above-mentioned. Screw with washer.   The fitting portion is provided with an insertion hole for inserting a jig for releasing the locking state of the claw into the locking groove into a portion facing the convex portion and the side surface of the screw boss. The screw with a washer according to claim 8, wherein the screw has a washer. A fixing structure for fixing a member to be fixed by a screw, a washer, and a screw boss screwed to the screw;
The washer includes a fitting portion that fits into a small-diameter portion between the screw head and the screw body, an elastic piece that extends in a tightening direction of the screw from a side edge of the fitting portion, and the elastic piece. A claw provided at the tip of the
The screw boss has a locking groove provided on the side surface for locking the claw,
The fixed member has a through hole for inserting the elastic piece,
When the screw with the washer is screwed into the screw boss with the member to be fixed interposed therebetween, the screw is tightened while inserting the elastic piece of the washer into the through hole of the member to be fixed, and the claw is A fixing structure characterized by being locked in a locking groove.   The fixing structure according to claim 10, wherein a plurality of elastic pieces and claws of the washer are provided, and a through hole of the fixed member is provided corresponding to each of the elastic pieces.   The convex part for warping the said elastic piece toward the outer side of the diameter of the said screw boss is provided in the part facing the side surface of the said screw boss of the said elastic piece, The Claim 10 or 11 characterized by the above-mentioned. Fixed structure.   The fitting portion is provided with an insertion hole for inserting a jig for releasing the locking state of the claw into the locking groove into a portion facing the convex portion and the side surface of the screw boss. The fixing structure according to claim 12, wherein the fixing structure is provided. A screw, a washer, and a screw boss threadedly engaged with the screw, wherein the washer is fitted into a small-diameter portion between the screw head and the screw body; A locking groove having an elastic piece extending from the edge in the tightening direction of the screw and a claw provided at the tip of the elastic piece, and the screw boss is provided on a side surface of the claw for locking the claw. A fixing method in a fixing structure in which the screw to which the washer is attached is screwed to and tightened to the screw boss with the fixed member interposed therebetween,
Inserting the elastic piece of the washer into the through hole of the fixed member;
And a step of locking the claw in the locking groove while tightening the screw. A screw, a washer, and a screw boss threadedly engaged with the screw, wherein the washer is fitted into a small-diameter portion between the screw head and the screw body; A locking groove having an elastic piece extending from the edge in the tightening direction of the screw and a claw provided at the tip of the elastic piece, and the screw boss is provided on a side surface of the claw for locking the claw. And the fixed member has a through hole for inserting the elastic piece, and when the screw with the washer is screwed into the screw boss with the fixed member interposed therebetween, The elastic piece of the washer is inserted into the through hole of the fixed member and the screw is tightened to lock the claw into the locking groove, and the elastic piece has a portion facing the side surface of the screw boss. , A convex portion for warping the elastic piece toward the outside of the diameter of the screw boss A unlocking method in provided comprising fixed structure,
Inserting a jig for releasing the locking state of the claw into the locking groove into a facing portion between the convex portion and the side surface of the screw boss;
And a step of releasing screwing of the screw with respect to the screw boss after an appropriate time.

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