JP2013019433A - Coming off preventing washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coming off preventing washer that can be easily detached from a fastening member.SOLUTION: The coming off preventing washer 1 is formed of a thin metal plate member, and includes; a first surface 11; and a second surface 12 on the opposite side. The coming off preventing washer 1 includes: an outer circumference 13; a circular axial hole 14 that is the inside of the outer circumference and penetrates from the first surface 11 to the second surface 12; and a plurality of slits 15 that radially extend to radially outer direction from the axial hole 14, that is, the outer circumference 13 side. At the terminal end 15a positioned at the outer circumference 13 side of the slit 15, a circular terminal hole 16 is formed. The outer circumference 13 of the coming off preventing washer 1 is formed of three pairs of linear parts 50 that are in parallel one and another. The length of the linear parts 50 is equalized one and another, and formed to be a regular hexagon as the whole outer circumference 13.

Description

  The present invention relates to a retaining washer that prevents a fastening member such as a screw from falling off a panel or the like of a member to be fastened.

  2. Description of the Related Art Conventionally, a retaining washer that is fitted into a screw is known as a retaining member that prevents the screw from falling off. For example, according to Patent Document 1, the retaining washer has a fitting portion for insertion into a screw formed by a central through hole, and a slit portion extending radially from the fitting portion. In order to prevent the washer from being removed from the screw, the diameter of the fitting portion should be equal to or less than the diameter of the screw, and by forming a slit portion extending from the fitting portion, the washer can be flexible and the fitting portion can be inserted into the screw. And the washer can be prevented from being removed from the screw.

JP 2001-50236 A (JP2001-50236A)

  In the retaining washer as described above, the outer periphery thereof is substantially circular. Such a washer is difficult to rotate while pinching its outer periphery, and is difficult to remove from the screw. When removing from the screw, the retaining washer was cut with a nipper or the like, or the retaining washer was strongly held with pliers or the like and rotated.

  An object of the present invention is to provide a retaining washer that can be easily detached from a fastening member.

  The present invention includes a first surface and a second surface opposite to the first surface, a shaft hole penetrating from the first surface to the second surface, a radial direction from the shaft hole toward an outer periphery, and the The present invention relates to improvement of a retaining washer including a circumferential direction intersecting with the radial direction and a plurality of slits extending outward in the radial direction from the shaft hole.

  In the retainer washer according to the present invention, the outer periphery includes a linear portion, and the end located on the radially outer side of the slit has a dimension larger than the circumferentially spaced dimension of the slit, A terminal hole penetrating from the first surface to the second surface is formed.

  In the present invention, since the retaining washer includes a linear portion on the outer periphery, it is easy to rotate while sandwiching the outer periphery, and can be easily removed from the fastening member.

Explanatory drawing of the use condition of a retaining washer. The perspective view of a retaining washer. The top view of a retaining washer. IV-IV sectional view taken on the line of FIG. The partial cross section figure of the use condition of the retaining washer. The top view which shows the other example of a retaining washer. The top view which shows the other example of a retaining washer.

  1 to 5 show a retaining washer 1 that is an example of an embodiment of the present invention. FIG. 1 is an explanatory view of the use state of the retaining washer 1, FIG. 2 is a perspective view of the retaining washer 1, FIG. 3 is a plan view of the retaining washer, FIG. FIG. 3 is a partial cross-sectional view of the drawing showing a use state of the retaining washer 1.

  As shown in FIG. 1, the retaining washer 1 is preferably formed of a thin plate member made of metal and has a first surface 11 and a second surface 12 on the opposite side. The retaining washer 1 is inserted into a screw 3 that is a fastening member via a panel 2 that is a member to be fastened, and the panel 2 is fixed to the housing body 4 by the screw 3. The panel 2 is formed with an opening 21 into which the shaft portion 31 of the screw 3 can be inserted, and the housing body 4 is formed with a screw groove 41 so that the screw 3 can be screwed together.

  As shown in FIGS. 2 and 3, the retaining washer 1 includes an outer periphery 13, a circular shaft hole 14 passing through the inner surface 13 from the first surface 11 to the second surface 12, and a diameter from the shaft hole 14. A plurality of slits 15 extending radially outward, that is, toward the outer periphery 13 side. The slits 15 penetrate from the first surface 11 to the second surface 12, and in this embodiment, six slits 15 are formed point-symmetrically. A circular terminal hole 16 is formed in the terminal end 15 a located on the outer periphery 13 side of the slit 15. A diameter A <b> 1 of the terminal hole 16 is set larger than a circumferential separation distance A <b> 2 of the slit 15. Since the slits 15 extend radially, the distance between the adjacent slits 15 toward the terminal end 15a increases. However, the distance between the slits 15 decreases in the portion where the terminal holes 16 are formed.

  In the retaining washer 1 as described above, a substantially fan-shaped flexible region 19 is defined by a virtual line 18 connecting the terminal hole 16 adjacent to the slit 15, and the first surface 11 or the second surface with the virtual line 18 as a base end. The flexible region 19 that is deformed toward 12 has flexibility (spring property). In the retaining washer 1, when the terminal hole 16 is formed, the circumferential separation distance serving as the base end of deformation is smaller than when the terminal hole 16 is not formed. The flexibility of the can be increased.

  An inclined portion 17 is formed in the vicinity of the shaft hole 14 so as to be inclined from the first surface 11 to the second surface 12. Specifically, the inclined portion 17 is formed between the shaft hole 14 and the outer periphery 13 and along the shaft hole 14. As shown in FIGS. 3 to 5, the diameter A3 of the shaft hole 14 is smaller than the diameter D1 of the head portion 32 of the screw 3, the outer diameter D2 formed by the threaded portion 33 of the shaft portion 31, and the screw It is smaller than the inner diameter D3 formed by the valley portion 34. Therefore, when the retaining washer 1 is inserted into the shaft portion 31, the flexible region 19 of the retaining washer 1 bends toward the second surface 12 and deforms. In particular, when the thread portion 33 is exceeded, the amount of deformation increases. Further, since the inclined portion 17 is formed in the shaft hole 14 so that its diameter decreases along the insertion direction, when the shaft portion 31 is inserted from the first surface 11 toward the second surface 12. The retaining washer 1 is easily bent and easily inserted. In the direction in which the retaining washer 1 inserted into the shaft portion 31 is removed from the screw 3, the shaft hole 14 is caught by the screw thread portion 33, and is not easily removed. In this embodiment, the diameter A3 of the shaft hole 14 is smaller than the outer diameter D2 and the inner diameter D3 of the shaft portion 31, but it is sufficient that it is at least smaller than the outer diameter D2.

  Since the retaining washer 1 is attached to the shaft portion 31 of the screw 3 via the panel 2, it is possible to prevent the screw 3 from falling off the panel 2 before and after the screw 3 is attached to the housing body 4. it can. Further, when the screw 3 is fixed to the panel 2 by the retaining washer 1, the head 32 of the screw 3 may be grasped and lifted or pulled together with the panel 2. However, since the retaining washer 1 is difficult to come off, the panel 2 and the screw 3 are not accidentally detached. Further, when the panel 2 is brought into contact with the head portion 32 of the screw 3 and the retaining washer 1 is attached to the shaft portion 31, rattling between the screw 3 and the panel 2 can be prevented. The mounting state can be stably maintained.

  The outer periphery 13 of the retaining washer 1 has at least a linear portion on one side. In this embodiment, the outer periphery 13 is formed by three pairs of parallel straight portions 50. The straight portions 50 are equal in length to each other, and are formed in a regular hexagonal shape on the entire outer periphery 13. The terminal hole 16 is formed on a line connecting the center O of the retaining washer 1 and the corner 51 formed on the outer periphery 13. Therefore, the separation distance between the terminal hole 16 and the outer periphery 13 can be made relatively large, and the strength can be prevented from decreasing on the outer peripheral side of the portion where the terminal hole 16 is formed.

  As shown in FIG. 3, the outer periphery 13 of the retaining washer 1 has a diameter A4 of about 20 mm. The diameter is a separation distance from one corner 51 through the center O to the other corner 51. In this embodiment, the corner 51 is rounded and processed into an arc shape.

  The retaining washer 1 as described above can be removed from the screw 3 by rotating in the circumferential direction along the thread valley portion 34. When the retaining washer 1 is rotated, a tool such as a finger or pliers can be hooked on the straight portion 50, so that it can be prevented from spinning around. In particular, in the case where a pair of parallel straight portions 50 are formed on the outer periphery 13, whether they are sandwiched between fingers and rotated, or they are rotated using a tool, a retaining washer 1 can be more easily held, and the washer 1 can be prevented from idling.

  The retaining washer 1 can be rotated by bringing a finger or a tool into contact with the outer periphery 13 thereof. When the outer periphery is circular as in the prior art, it is difficult to rotate the outer periphery even if a finger or a tool is brought into contact with the outer periphery. Is strongly clamped with a tool or the like. Since the retainer washer 1 often uses a thin plate member, when these surfaces are strongly clamped, this is deformed, and it is impossible to reuse the washer after removal. Since the retaining washer 1 according to the present invention can be removed from the screw 3 without strongly holding it, the washer 1 after removal is not easily deformed. In addition, since the outer periphery 13 can be clamped, deformation of the washer 1 can be prevented as compared with the case where the first and second surfaces 11 and 12 are clamped. Therefore, the retaining washer 1 after being removed can be reused.

  In the retaining washer 1, a general tool such as a hexagon wrench can be used by making the outer periphery 13 into a regular hexagon. In this case, the retaining washer 1 can be rotated more easily.

  FIG. 6 shows another example of this embodiment. As shown in the figure, in this embodiment, a pair of linear portions 50 that are parallel to each other are formed on the outer periphery 13 of the retaining washer 1, and the space between these linear portions 50 is curved.

  FIG. 7 shows another example of this embodiment. In this embodiment, the three straight portions 50 are formed by making the outer periphery 13 of the retaining washer 1 an equilateral triangle. In this case, straight portions parallel to each other are not formed, but the washer 1 can be sandwiched by placing, for example, a thumb and an index finger on the adjacent straight portions 50.

  In the present invention, the terminal hole 16 is circular, but may be oval or elliptical. Specifically, it can be formed such that the minor axis extends in the same direction as the radially extending slit 15, that is, in the radial direction, and the major axis extends perpendicularly thereto. By forming the terminal hole 16 in this way, the imaginary line 18 between the terminal holes 16 can be shortened even in the vicinity of the terminal end 15a of the slit 15, and the flexibility of the flexible region 19 is further increased. be able to.

  The straight portions 50 have the same length, but may be different. In this case, it is possible to appropriately change to various polygons having different lengths of the straight portion 50. Moreover, although the corner | angular 51 is made into the curve, you may form with the straight line which mutually crosses without being restricted to this.

  The dimensions of the retaining washer 1 and the screw 3 are not limited to those illustrated in this embodiment, and can be changed as appropriate. For example, the shape of the terminal hole 16 can be variously selected as long as the dimension between the slits 15 can be reduced to increase the flexibility. Further, the number of slits 15 is not limited to the number in this embodiment, and can be changed as appropriate. As long as it includes at least one straight line portion 50 on the outer periphery, the number thereof is not limited.

  The disclosure relating to the present invention described above can be summarized at least in the following matters.

  The retaining washer 1 includes a first surface 11, a second surface 12 opposite to the first surface 11, a shaft hole 14 penetrating from the first surface 11 to the second surface 12, and the shaft hole A radial direction from 14 to the outer periphery 13 and a circumferential direction intersecting the radial direction, and a plurality of slits 15 extending from the shaft hole 14 to the radially outer side. The retaining washer 1 according to the present invention is characterized in that the outer periphery 13 includes a straight portion 50, and the end 15 a positioned on the radially outer side of the slit 15 is closer to the circumferential spacing of the slit 15. A terminal hole 16 having a large dimension and penetrating from the first surface 11 to the second surface 12 is formed.

The present invention can include at least the following embodiments.
(1) A plurality of the straight portions 50 are formed and include at least a pair of the straight portions 50 parallel to each other.
(2) The plurality of linear portions 50 have the same length dimension.
(3) The shaft portion 31 of the fastening member 3 in which the screw thread portion 33 and the screw thread portion 34 are formed is inserted into the shaft hole 14, and the diameter of the shaft hole 32 is formed by the screw thread portion 33. The outer diameter and the inner diameter formed by the thread valley 34 are smaller.
(4) The retaining washer 1 is made of a metal material.

  In the specification and claims of this invention, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like. In addition to the materials described in this specification, various known materials that are usually used in this type of field can be used without limitation for the constituent members constituting the retaining washer 1.

DESCRIPTION OF SYMBOLS 1 Retaining washer 11 1st surface 12 2nd surface 13 Outer periphery 14 Shaft hole 15 Slit 15a Terminal 16 Terminal hole 17 Inclined part 3 Screw (fastening member)
31 Shaft 33 Thread 34 Thread Valley 50 Straight Line 51 Corner

Claims (5)

A first surface and a second surface opposite to the first surface, a shaft hole penetrating from the first surface to the second surface, a radial direction from the shaft hole toward an outer periphery, and a cross in the radial direction In a retaining washer that includes a circumferential direction and a plurality of slits extending radially outward from the shaft hole,
The outer periphery includes a straight portion,
A terminal hole penetrating from the first surface to the second surface is formed at a terminal end of the slit located on the outer side in the radial direction, and has a size larger than the circumferential separation size of the slit. The retaining washer as described above.   The retaining washer according to claim 1, wherein a plurality of the straight portions are formed and include at least a pair of the straight portions parallel to each other.   The retaining washer according to claim 1 or 2, wherein the plurality of straight portions have the same length.   The shaft hole is inserted with a shaft portion of a fastening member in which a screw thread portion and a screw valley portion are formed, and the diameter of the shaft hole is formed by an outer diameter formed by the screw thread portion and the screw valley portion. The retaining washer according to any one of claims 1 to 3, which is smaller than the inner diameter.   The retaining washer according to any one of claims 1 to 4, which is made of a metal material.

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