JP2012154460A - Screw member for operation, and screwing structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To temporarily hold a screw member for operation to an mounting member, simply, surely and still inexpensively.SOLUTION: The screw member is constituted such that it is temporarily held with a mounting hole 21 formed in the mounting member, is screwed in a female screw hole 31 formed in a mounting object, and screws the mounting member. The screw member 10 for operation is integratedly provided with: a male screw 12 formed at an end on one side of a shaft 11; a screw head 19 continuously arranged on the other side of the shaft 11, and equipped with an operating means 19a around; an engagement protrusion 13 equipped in a cylinder part 14 positioned between the male screw 12 and the screw head 19, and also equipped to protrude in a circumferential and radial directions of the cylinder 19; and a slot 17 formed parallel to an axial line from the end of the shaft 11. A screwing structure using the screw member 10 for operation is also provided.

Description

The present invention is an operation screw member configured to be temporarily held in an attachment hole formed in the attachment member, and to be screwed into the female screw hole formed in the attachment object, and to screw the attachment member, and Regarding the screwing structure using the operation screw member, in particular, when opening and closing the lid of the housing containing the electronic device etc., the screw member that can be operated by hand for the opening and closing, The present invention relates to an operation screw member that prevents the screw member from dropping when the lid is open, and a screwing structure that prevents the screw member from loosening when the lid is closed.

Conventionally, as an operation screw member configured to exert a retaining action by temporarily holding in the mounting hole while being inserted into the mounting hole provided in the mounting member, for example, the head 5 of the screw 2 is used. A resin-made knob member 10 having a first engagement inner peripheral surface 15 that is fitted so as to be able to transmit rotation is fitted to the screw head 5, and the screw leg is attached to the knob member 10. A retainer 12 having elasticity is provided so as to bend in a direction along which the tip 3 crosses the leg 3 at a predetermined distance from the portion 3, while the rear portion of the knob member 10 is extended. The screw member 1 for operation assembled by fitting a stopper plug 20 having a second engagement inner peripheral surface 26 which is in contact with the screw head 5 and has a second engagement inner peripheral surface 26 engaged with the head 5 so as to be able to transmit rotation. Proposed.

According to this operating screw member 1, the operating screw member 1 is pushed into a mounting hole 31 formed in the door plate 30 of the case 40, thereby forming a latch formed at the distal end portion of the retaining portion 12. The part 13 engages with the back surface of the door plate 30, and the operation screw member 1 does not fall out of the mounting hole 31 of the door plate 30.
(For example, see Patent Document 1)

JP 2006-009975 A

However, according to the operation screw member 1, a commercially available screw 2 having a polygonal outer peripheral surface is inserted into the knob member 10 made of resin, and the head 5 of the screw 2 is prevented from coming off. Since it is pressed with the stopper 12 and integrated with the knob member 10, the assembling work is simplified, and the manufacturing of the resin member is simpler than that in which the resin member is integrally molded with the screw 2. There was a problem that the screw member for operation was constituted by combining a plurality of parts as usual. Considering the case where the operation screw member 1 is disposed of separately, the operation screw member 1 is composed of a metal screw 2 and a resin knob member 10, so that the resin member is integrated with the screw. Although the separation is easier than the molded one, there is still a problem that an extra work for separating the metal screw 2 from the resin knob 10 is necessary.

Further, according to the operation screw member 1, the locking screw formed on the distal end portion of the retaining portion 12 by pushing the operation screw member 1 into the mounting hole 31 formed in the door plate 30. Although the piece 13 is configured to engage with the back surface of the door plate, the operation screw member 1 is located between the locking piece 13 and the knob member with respect to the mounting hole 31 of the door plate 30 in detail. Since the retaining portion 12 is assembled so as to be securely fitted (FIG. 8 of the background art), the operation screw member is assembled so as to hardly move in the axial direction. That is, when the case 40 is installed, if the door plate 30 to which the operation screw member 1 is assembled is closed due to an unexpected situation (for example, gusts), the operation screw member 1 Hits the female screw hole 41 formed in the case 40, and in the worst case, the screw thread 4 provided in the operating screw member 1 and the screw thread provided in the female screw hole 41 are damaged, and the operating screw member 1 There is a problem in that the case 40 cannot be screwed, that is, the case 40 cannot be closed by the door plate 30.

Further, as described above, the operation screw member 1 is not screwed into the female screw hole 41 because the retaining member 12 is securely assembled to the mounting hole 31 of the door plate 30 so as to be fitted. However, since there is almost no gap between the knob member 10 and the door plate 30, it is difficult to determine whether or not the operating screw member 1 is screwed into the female screw hole 41 from the outside of the door plate 30. If the screwing by the operating screw member 1 is not complete due to a work mistake or if the screwing is forgotten, it is difficult to confirm from the outside of the door plate 30, and the operating screw is particularly useful. In the case where there are a large number of members 1, there is a problem that the productivity is remarkably lowered and the reliability is also lowered.

Therefore, in this application, it was made to solve these problems.
The object is to provide a screw member for operation that exhibits the effect of retaining action easily and inexpensively.
Another object of the present invention is to provide a screwing structure that exhibits a locking action when the operating screw member is fastened to the female screw hole.
Another object is to provide a highly reliable screwing structure in which the operation screw member and the female screw hole into which the operation screw member is screwed are not easily damaged.
Another object of the present invention is to provide a screwing structure in which the operation screw member can be easily confirmed to be fastened or forgotten to be fastened.

In order to solve the above problems, the invention of claim 1 is temporarily held in a mounting hole formed in a mounting member, and is screwed into a female screw hole formed in a mounting object to screw the mounting member. In the screw member configured as described above, a male screw portion formed at a tip portion on one side of a shaft portion having an outer diameter that can be freely inserted into the mounting hole, and a screw provided continuously on the other side of the shaft portion A cylindrical portion located between the head and the male screw portion and the screw head is provided so as to protrude in the circumferential direction of the cylindrical portion, and engages with a hole edge of the mounting hole. The engaging projection and a slit formed along the axis from the tip of the shaft portion are integrally provided.

According to a second aspect of the present invention, there is provided a screwing structure including the operation screw member according to the first aspect, wherein the mounting hole formed in the mounting member is provided between the screw head and the engagement protrusion. The operation screw member temporarily held in a loosely-insertable manner is screwed into a female screw hole formed in an attachment object, and the attachment member is screwed.

According to a third aspect of the present invention, in the screwing structure according to the second aspect, the screw member for operation is provided between the cylindrical portion and the screw head so as to coincide with each axis. On the other hand, the mounting hole is formed so as to protrude on the surface facing the screw member for operation so as to coincide with the axis of the mounting hole, and communicates with the mounting hole inside. An annular wall portion having a space for the operation, and when the operating screw member is inserted into the mounting hole, at least a part of the guide cylindrical portion is temporarily held in a state of being inserted into the annular wall portion. Configured to be.

According to a fourth aspect of the present invention, in the screwing structure according to any one of the second or third aspects, when the mounting member is screwed to the mounting object using the operating screw member. The screw member for operation temporarily held in the attachment hole can be moved in the axial direction to a position where the object to be attached and the attachment member do not interfere with the state where they are arranged so as to contact each other. The length of the cylindrical portion including the engaging protrusion is formed.

According to a fifth aspect of the present invention, in the screw fastening structure according to any one of the second to fourth aspects, the shaft including at least the male screw portion when the operating screw member is screwed into the female screw hole. The diameter of the female screw hole formed in the attachment object was formed so that it could be mounted while reducing the diameter of the part.

According to a sixth aspect of the present invention, in the screwing structure according to any one of the second to fourth aspects, the screw member for operation is provided along the axis from the tip end of the shaft portion to the tip end of the shaft portion. A cylindrical cavity provided concentrically with the shaft portion from an intermediate position of the shaft portion to the intermediate portion of the shaft portion, while the female screw hole is located at an opposite position facing the insertion port of the operating screw member. A protruding portion provided so as to coincide with the axis of the female screw hole, and protruding so as to face the operating screw member; and when the operating screw member is screwed into the female screw hole, the protruding portion Is inserted into the cylindrical cavity from the tip of the operation screw member, so that it can be mounted while expanding the diameter of at least the shaft portion including the male screw portion.

According to the first aspect of the present invention, the screw member is temporarily held in the mounting hole formed in the mounting member, and is screwed into the female screw hole formed in the mounting target to screw the mounting member. A male screw part formed at a tip part on one side of a shaft part having an outer diameter that can be freely inserted into the mounting hole, a screw head connected to the other side of the shaft part, and the male screw An engagement protrusion provided on a cylindrical portion located between the screw portion and the screw head and protruding in the circumferential direction of the cylindrical portion and engaging with a hole edge of the mounting hole; By comprising a slit formed so as to extend along the axis from the tip of the shaft part,
Even if it is inexpensive, it is possible to provide an operation screw member that can be temporarily and securely held on the mounting member. In addition, since the operating screw members of the present invention are all made of the same member, for example, the operating screw member made of a plurality of different materials, such as a metal screw and a resin knob member, is used. Compared with screw members, etc., the convenience when sorting and discarding is extremely good.

According to the second and third aspects of the present invention, the operating screw temporarily held in the mounting hole formed in the mounting member so as to be freely inserted between the screw head and the engaging protrusion. In the screwing structure in which a member is screwed into a female screw hole formed in an attachment object and the attachment member is screwed, the screw member for operation includes a cylindrical portion and a screw head. In the meantime, a guide cylindrical portion provided so as to coincide with each axis is provided. On the other hand, the mounting hole is formed on the surface side facing the operation screw member, with the axis of the mounting hole. An annular wall portion that protrudes so as to match and has a space communicating with the mounting hole therein is provided, and when the operating screw member is inserted into the mounting hole, at least one of the guide cylindrical portion is provided. Is temporarily held with the part inserted into the annular wall By constructed as,
Even if gravity is applied downward to the operating screw member and the axis of the operating screw member is inclined, the inclination can be kept extremely small. As a result, since the operating screw member and the female screw hole are arranged to face each other so that their axes are substantially coincident with each other, a screw-fastening structure capable of easily screwing the operating screw member into the female screw hole is provided. Can be provided.

According to a fourth aspect of the present invention, the operating screw member temporarily held in the mounting hole formed in the mounting member is screwed into the female screw hole formed in the mounting object, and the mounting member is screwed. In the screwing structure according to any one of claims 2 to 3, wherein the operation member is used to screw the attachment member onto the attachment object, The operation screw member temporarily held in the attachment hole is movable in the axial direction to a position where the attachment object and the attachment member do not interfere with the state where the attachment object and the attachment member are arranged to contact each other. Since the length of the cylindrical part including the engaging protrusion was formed,
For example, when considering a case in which the attachment member is hinged so as to be openable and closable with respect to the attachment object, the attachment member is opened in the state in which the attachment member is opened during the installation operation of the case. Even if the operating screw member collides with a female screw hole formed in an attachment object due to an unexpected situation (for example, a gust of wind), the operating screw member faces the front in the axial direction. Change its position so that it is pushed out. For this reason, the male screw part provided in the operating screw member and the female screw part provided in the female screw hole are damaged and the operating screw member cannot be screwed. It is possible to eliminate the problem that the blockage cannot be properly performed.

Further, even when the male screw portion of the operating screw member is not screwed into the female screw portion of the female screw hole in a state where the mounting member is closed with respect to the attachment object, The position of the screw member for operation is changed so that the screw member is pushed forward in the axial direction, and from the gap formed between the screw head and the annular wall portion, Some can be exposed. As a result, it can be confirmed visually that the screw member for operation is not screwed into the female screw hole, and it is possible to prevent forgetting to tighten the screw member for operation. An electronic apparatus having a highly reliable screw-fastening structure can be provided.

Preferably, as in the invention of claim 5, the operating screw member temporarily held in the mounting hole formed in the mounting member is screwed into a female screw hole formed in the mounting object to perform the mounting. The screwing structure according to any one of claims 2 to 4, wherein the member is screwed. When the operating screw member is screwed into the female screw hole, at least the male screw portion is provided. If the diameter of the female screw hole formed in the attachment object is formed so that it can be mounted while reducing the diameter of the shaft part including it,
The shaft portions including the male screw portions, each of which is reduced in diameter so as to bend inward, press the inner peripheral surface of the female screw hole outwardly by an urging force generated when the shaft portions are restored to their original shapes. To do. As a result, since the operating screw member can be more firmly screwed into the female screw hole, in addition to the above effects, even if the mounting member or the mounting object vibrates, the operating screw It is possible to provide a screwing structure having an effect that the member is hardly loosened.

As another embodiment, as in the invention of claim 6, the operating screw member temporarily held in the mounting hole formed in the mounting member is screwed into the female screw hole formed in the mounting object. The screwing structure according to any one of claims 2 to 4, wherein the mounting member is configured to be screwed. The screw member for operation is arranged along the axis from the tip of the shaft portion. A cylindrical cavity is provided concentrically with the shaft from the tip of the shaft to an intermediate position of the shaft. On the other hand, the female screw hole is opposite to the insertion port of the operating screw member. A projecting portion which is provided at a position so as to coincide with the axis of the female screw hole and which projects to face the operating screw member; and when the operating screw member is screwed into the female screw hole. , The protrusion is the tip of the operating screw member Wherein by being inserted into the cylindrical cavity, if configured to be mounted while diameter shaft portion including at least the male thread portion from
The shaft portions including at least the male screw portion, each of which is expanded outward, presses the inner peripheral surface of the female screw hole. Therefore, since the operating screw member can be screwed into the female screw hole more firmly, in addition to the above effects, even if the mounting member or the mounting object vibrates, the operating screw member is loosened. A difficult screwing structure can be provided.

Schematic for demonstrating the screw member for operation of this invention. It is the side view which fractured | ruptured one part for demonstrating the procedure which inserts the screw member for operation of this invention in the cover body of the housing | casing which is the attachment member of the said screw member for operation, (a) is for operation Before insertion of the screw member, (b) shows after insertion of the operation screw member. The side view which fractured | ruptured one part for showing the opening-and-closing state of the cover body provided with the screw member for operation of this invention. It is the side view which fractured | ruptured part for demonstrating the screwing structure in the housing | casing provided with the screw member for operation of this invention, and is explanatory drawing which shows the state before screwing of the screw member for operation. It is the side view which fractured | ruptured part for demonstrating the screwing structure in the housing | casing provided with the screw member for operation of this invention, and is explanatory drawing which shows the state after screwing of the screw member for operation. It is sectional drawing to which the principal part for demonstrating the Example from which the screwing structure of this invention differs is expanded.

In the following description, directions are described based on the state shown in FIG. 3 unless otherwise specified. As shown in FIG. 3, the casing 1 according to the embodiment of the present invention is mounted on the wall surface. In the state attached to 50, the right side of the figure is the front or the front, the left side of the figure is the back or the back, the upper side of the figure is the upper side or the upper side, and the lower side is the lower side or the lower side. In the figure, reference numeral 10 denotes the operating screw member of the present invention.

An embodiment of the operating screw member 10 of the present invention will be described below. 1A and 1B are schematic views for explaining an operation screw member 10 according to the present invention, in which FIG. 1A is a side view showing a partial cross section of the operation screw member 10, and FIG. The front view seen from the right (male thread part 12 side), (c) is a top view, (d) is the front view which looked at the screw member 10 for operation from the left (screw head 19 side) of the figure.

The operation screw member 10 according to the embodiment of the present invention is formed by an elastic member such as a synthetic resin material, and the configuration thereof includes a male screw portion 12 formed at one end of the shaft portion 11 and a male screw portion 12. The screw head 19 is connected to the other side of the shaft portion 11 and has an operating means 19a around it, and the cylindrical portion 14 is located between the male screw portion 12 and the screw head portion 19. In addition, the engagement protrusion 13 provided so as to protrude in the circumferential direction of the cylindrical portion 14 is integrally provided. Further, the operating screw member 10 of the present invention has a slot 17 formed so as to penetrate from the front end to the rear side of the shaft 11 along the axis from the tip of one side of the shaft 11. Is formed. Therefore, the operating screw member 10 according to the embodiment of the present invention is approximately half of the shaft portion 11 including at least the male screw portion 12 divided through the slit 17 (more specifically, the male screw portion 12). And a half of the shaft portion 11 provided with the engagement protrusion 13 and the cylindrical portion 14 provided with the engagement protrusion. It is described as an elastic locking piece 15).

That is, the operation screw member 10 in the embodiment of the present invention is formed with the pair of elastic locking pieces 15 including the shaft portion 11 including at least the male screw portion 12 by forming the slit 17. In addition, the elastic locking piece 15 is configured to be capable of expanding or contracting with the axis of the operating screw member 10 as the center. In the embodiment of the present invention, the slot 17 is provided so that a pair of elastic locking pieces 15 are formed. However, the present invention is not limited to this embodiment. The slits 17 may be formed so that two or more are formed.

In addition, the screw head 19 of the operating screw member 10 is integrally connected to the screw head 19 from the screw head 19 toward the distal end side of the shaft portion so as to coincide with the respective shaft centers. A guide cylindrical portion 16 having a shorter outer diameter than the screw head 19 is provided. Further, on the peripheral surface 16b of the guide cylindrical portion 16, for example, a clear pattern such as uneven means 16c is formed. Furthermore, a cylindrical cavity 18 having an opening at one end of the shaft portion 11 on the inner side of the shaft portion 11 and formed concentrically along the axis of the shaft portion 11 is provided. Is formed. In the embodiment of the present invention, an example in which the guide cylindrical portion 16 and the cylindrical cavity 18 are provided is shown, but it may be omitted.

Next, a specific method of using the operating screw member 10 configured as described above will be described with reference to FIG. FIG. 2 is a side view in which a part of the operation screw member 10 of the present invention is inserted into the lid 2 of the casing 1 to be described later. The figure before inserting the member 10 in the cover body 2, (b) is a view immediately after the operation screw member 10 is inserted in the cover body 2.

The housing 1 in the embodiment of the present invention includes a box 3 having a front side opened and a space for storing the electronic circuit unit and the like inside, and a lid for covering the opening of the box 3 2. In the following description, as a specific example of the housing 1, the lid 2 and the box 3 can be fixed so that the lid 2 can be opened and closed in the vertical direction with respect to the box 3. For example, a storage case of an electronic device mounted with, for example, an electronic circuit unit or the like is used.

First, the lid 2 will be described in detail with reference to FIG. A mounting hole 21 for inserting the operating screw member 10 of the present invention is formed on the front end side (right side in FIG. 2) of the front panel 23 constituting the lid 2 so as to penetrate the front panel 23. Is formed. The inner diameter of the mounting hole 21 is such that the male screw portion 12 and the shaft portion 11 of the operating screw member 10 can be freely inserted, and that the shaft portion 11 including the engaging protrusion 13 is slightly inserted. It is formed to have a size of

Further, the lid 2 is formed so as to protrude from the front panel 23 on the surface side (front side) of the mounting hole 21 facing the operating screw member 10 so as to coincide with the axis of the mounting hole 21. An annular wall portion 25 having a space 25a communicating with the mounting hole 21 is formed inside. The inner diameter of the annular wall portion 25 is formed to be slightly larger than the outer diameter of the guide cylindrical portion 16 provided on the operating screw member 10, and the projecting dimension H of the annular wall portion 25 is: By forming the guide cylindrical portion 16 so as to have a dimension (h≈H) that is substantially equal to the dimension h in the height direction of the guide cylindrical portion 16, the space 25a formed by the annular wall portion 25 has the guide cylindrical portion 16 disposed therein. The size is such that it can be stored.

The operation screw member 10 is attached to the attachment hole 21 of the lid 2 configured as described above. This attachment is performed by inserting the operation screw member 10 into the attachment hole 21 from the front side of the lid 2. At this time, the inner diameter of the mounting hole 21 is so large that the male screw portion 12 and the shaft portion 11 can be freely inserted, and that the shaft portion 11 including the engagement protrusion 13 cannot be inserted through the mounting hole 21 slightly. Therefore, the engagement protrusion 13 comes into contact with the hole edge 21 a on the front surface side of the mounting hole 21.

However, if the operating screw member 10 is pressed toward the mounting hole 21, the engaging protrusion 13 is pressed inward by the hole edge 21 a of the mounting hole 21, and accordingly, the operating screw member 10 is formed on the operating screw member 10. Since the pair of elastic locking pieces 15 are bent inward, the engagement protrusion 13 is inserted into the attachment hole 21 so as to get over the hole edge 21a on the front side of the attachment hole 21. , Projecting to the opposite side of the mounting hole 21. At the same time, due to the urging force of the elastic locking piece 15, the elastic locking piece 15 returns to its original state, and the engagement protrusion 13 engages with the hole edge 21 a on the back side of the mounting hole 21, The insertion of the operation screw member 10 is completed. As already described in detail, the inner diameter of the mounting hole 21 is slightly larger than the outer diameters of the male screw portion 12 and the shaft portion 11, so that the operating screw member 10 is attached to the mounting hole 21 of the lid 2. However, since the engaging protrusion 13 engages with the hole edge 21 a on the back side of the mounting hole 21, the operating screw member 10 does not fall out of the lid 2.

That is, according to the operating screw member 10 of the present invention, all the components are integrally provided by molding the same member, for example, an elastic member such as a synthetic resin material. Even if the pair of elastic locking pieces 15 in which the shaft portion 11 composed of at least the male screw portion 12, the engaging protrusion 13, and the cylindrical portion 14 is divided vertically are arranged to face each other, the cost can be reduced. The screw member 10 for operation which can be temporarily hold | maintained to the cover body 2 simply and reliably can be provided. Further, since the operation screw member 10 of the present invention is composed of the same member, as compared with the operation screw member composed of a metal screw and a resin knob member as in the prior art, Convenience in the case of separating and discarding the operation screw member can be made extremely good.
The lid 2 is an example of an attachment member for temporarily holding the operation screw member 10 described in the claims.

The operation screw member 10 attached to the attachment hole 21 of the lid 2 will be described in more detail. In the embodiment of the present invention, immediately after the operation screw member 10 is inserted into the mounting hole 21, that is, as well shown in FIG. In a state where it is in a position in contact with the side hole edge 21a, at least a part of the guide cylindrical portion 16 provided in the operation screw member 10 on the lower side (the length of HL) is the annular shape. It is comprised so that it may be accommodated in the space 25a which the wall part 25 forms. That is, if the operating screw member 10 is temporarily held in the mounting hole 21 formed in the mounting member, the guide cylindrical portion 16 does not jump out of the space 25a formed by the annular wall portion 25. It is configured as follows.

Next, the screwing structure of the operating screw member 10 mounted on the lid 2 as the mounting member and the female screw hole 31 formed in the box 3 will be described with reference to FIGS. I will explain. In these drawings, FIG. 3 is a partially cutaway side view for showing an open / closed state of the lid body 2 provided with the operating screw member 10 of the present invention. FIG. 4 is a partially cutaway side view for explaining the screwing structure in the housing 1 provided with the operation screw member 10 of the present invention, and the state before the operation screw member 10 is screwed together. It is explanatory drawing which shows. FIG. 5 is a side view showing a state after the operation screw member 10 is screwed.

As shown in FIGS. 3 to 5, the lid body 2 and the box body 3 are configured so that the operation screw member 10 temporarily held in the mounting hole 21 of the lid body 2 is attached to the box body 3. By screwing into the formed female screw hole 31, the opening of the box 3 is fixed so as to be openable and closable. As shown in FIGS. 3 to 5, the female screw hole 31 in the embodiment of the present invention is formed in a pedestal 35 provided so as to protrude from one of the side walls of the box 3. A female screw portion 32 corresponding to the male screw portion 12 of the operating screw member 10 is formed inside the female screw hole 31. In an embodiment of the present invention, the side wall of the box 3 provided with the pedestal 35 is a side wall located below the box 3, and the electronic circuit unit 5 housed in the box 3 and the outside The terminal panel 33 is configured such that the input and output terminals 6 for connecting the two and the output terminal 6 project downward from the box 3.
In addition, this box 3 is an example of the attachment target object which screws the said attachment member using the said screw member 10 for operation described in the claim.

Here, the length of the cylindrical portion 14 constituting the operation screw member 10 will be described. As already described in detail, the operation projection member 13 is engaged with the hole edge 21a on the back surface side of the mounting hole 21 in a state where the operating screw member 10 is temporarily held in the mounting hole 21. The screw member 10 does not fall out of the lid 2, and as can be seen from a comparison between FIG. 4 and FIG. 5, the screw member 10 for operation has the engagement protrusion 13 formed on the cylindrical portion 14. And the end surface 16a of the guide cylindrical portion 16 are held in the mounting hole 21 so as to be freely insertable.

More specifically, as shown in FIG. 4, the operating screw member 10 of the present invention is such that the male screw portion 12 of the operating screw member 10 is not screwed into the female screw portion 32 of the female screw hole 31. However, the lid 2 is temporarily held in the mounting hole 21 so as to be freely inserted so as not to obstruct the closure of the box 3 with the opening of the box 3 properly closed.

In other words, the length of the cylindrical portion 14 including the engaging projection 13 of the operating screw member 10 of the present invention is such that the lid 2 is open to the box 3 as shown in FIG. Even when the operation screw member 10 may come into contact with, for example, the opening edge of the female screw portion 31 when closed so as to be closed with respect to the portion, the operation screw member 10 is moved forward in the axial direction. By being pushed out, the lid 2 can be normally closed with respect to the opening of the box 3, and all of the guide cylindrical portion 16 of the operating screw member 10 is in the annular shape. The length of the cylindrical portion 14 is determined so that the wall portion 25 does not jump out of the space 25a (that is, a part of the guide cylindrical portion 16 is left in the space 25a). Yes.

In this manner, the operating screw member 10 is pushed forward in the axial direction in a state where the operating screw member 10 is temporarily held in the mounting hole 21 formed in the lid 2 that is the mounting member. However, by preventing the guide cylindrical portion 16 from jumping out of the space 25a formed inside the annular wall portion 25, the lid 2 as an attachment member, for example, is shown in FIG. When the lid 2 is pivotably attached to the box 3 (indicated by a solid line), the operation screw member 10 is moved by the gravity applied below to the operation body. When the lid 2 is closed (indicated by a one-dot chain line) even when the screw member 10 is attached to the attachment hole 21 in a stable state so that the axis CL1 of the screw member 10 indicates the vertical direction, the lid 2 is vertically As said, Even if the axis of the operating screw member 10 is inclined like the axis CL2 from the virtual axis CL1 ′ indicating the vertical direction due to gravity applied to the screw member 10, the inclination r can be kept extremely small. it can. As a result, since the operating screw member 10 and the female screw hole 31 are arranged to face each other so that their axes are substantially coincident with each other, the screwing operation of the operating screw member 10 to the female screw hole 31 is easily performed. It can be set as a screwing structure.

In addition, as shown in FIG. 4, in a state where the lid 2 is closed with respect to the opening of the box 3, the operation screw member 10 is pushed forward in the axial direction, and the operation Since the screw member 10 is configured so as not to disturb the normal closed state of the lid 2, the installation work on the wall surface 50 of the housing 1, the electronic circuit unit 5 housed in the housing 1, etc. In various adjustments to the above, when the lid 2 is in an opened state as shown in FIG. 3, the lid 2 may be closed due to an unexpected situation (for example, a gust of wind). Even if the screw member 10 hits the female screw hole 31 formed in the box 3, the position of the screw member 10 is changed so that the operation screw member 10 is pushed forward in the axial direction. Therefore, the male screw portion 12 provided in the operating screw member 10 and the female screw portion 32 provided in the female screw hole 31 are damaged, and the operating screw member 10 cannot be screwed. The problem that the box 3 (attachment object) cannot be properly closed by the lid 2 (attachment member) is eliminated.

More specifically, the male screw portion 12 of the operating screw member 10 is connected to the female screw portion 32 of the female screw hole 31 in a state in which the lid 2 that is an attachment member is closed with respect to the box 3 that is an attachment target. Even if the screw member 10 is not screwed, the position of the screw member 10 for operation is changed so that it is pushed forward in the axial direction, and as shown in FIG. The peripheral surface 16b of the guide cylindrical portion 16 can be exposed from the gap W appearing between the step 9 of the portion 19 and the opening end portion 25b of the annular wall portion 25. As a result, it can be surely confirmed visually that the operating screw member 10 is not screwed into the female screw hole 31. That is, according to the screwing structure of the embodiment of the present invention, it is possible to easily prevent forgetting to tighten the operating screw member 10 and the like, and an electronic apparatus having a screwing structure that is extremely easy to handle and highly reliable. Can provide. As shown in FIG. 1 or FIG. 3, if the peripheral surface 16b of the guide cylindrical portion 16 is provided with a clear pattern such as a convex / concave means 16c, the peripheral surface 16b can be further easily visually observed. .

Note that, as exemplified below, the present invention can be implemented by appropriately changing the configuration of each part without departing from the spirit of the present invention.
For example, the female screw hole 31 described above may be a female screw hole 31A shown in FIG. The difference between the female screw hole 31A and the female screw hole 31 is in the inner diameter. That is, the female screw hole 31A in this different embodiment reduces the diameter of the shaft part 11 including the male screw part 12 of the operating screw member 10 when the operating screw member 10 is screwed into the female screw hole 31A. In other words, for example, the inner diameter of the female screw hole 31A is formed so as to decrease toward the bottom 31a so that the elastic locking piece 15 can be mounted while being bent inward. It is formed to be slightly smaller than the inner diameter.

According to this configuration, the elastic locking pieces 15 each having a diameter reduced so as to bend inwardly, that is, the shaft portion 11 including at least the male screw portion 12 is caused by the urging force generated to restore the original shape. The inner peripheral surface of the female screw hole 31 is pressed outward in the circumferential direction (arrow direction in the figure). As a result, since the operating screw member 10 can be screwed into the female screw hole 31 more firmly, even if the housing 1 or the like vibrates, the operating screw member 10 is further loosened and loosened. A difficult screwing structure can be provided. If the male screw portion 12 of the operating screw member 10 is tapered, even if the inner diameter of the female screw hole 31A is slightly smaller than the inner diameter of the female screw hole 31, the screw The joint operation is not difficult. In addition, since the screw head 19 of the operation screw member 10 is provided with an operation means 19a around it, the screw operation of the operation screw member 10 and the female screw hole 31A can be easily performed. Can do.

The female screw hole 31 described above may be a female screw hole 31B shown in FIG. The difference between the female screw hole 31B and the female screw hole 31 is at the bottom of the female screw hole. Specifically, the bottom 31b of the female screw hole 31B is provided with a protrusion 38 that does not exist at the bottom of the female screw hole 31. In the embodiment of the present invention, the protrusion 38 has a conical shape with a tapered shape, and the protrusion 38 has an axial line of the female screw hole 31B so that the axis of the protrusion 38 coincides with the axial line of the female screw hole 31. It is formed on the bottom 31b. That is, in the process of screwing the operating screw member 10 into the female screw hole 31B, the cylindrical cavity 18 formed so as to extend along the axis of the operating screw member 10 from the distal end portion of the protruding portion 38. It is formed so as to be inserted inside.

According to this configuration, when the operating screw member 10 is screwed into the female screw hole 31 </ b> B, the inclined surface 38 a of the protrusion 38 abuts against the opening edge 18 a of the cylindrical cavity 18. However, when the operation screw member 10 is further screwed in, the elastic locking piece 15 of the operation screw member 10 is caused to follow the inclined surface 38 a of the projection 38 due to the presence of the opening edge 18 a of the cylindrical cavity 18. The outer circumferential surface is pushed outward (in the direction of the arrow in the figure) to press the inner circumferential surface of the female screw hole 31B. Therefore, the operating screw member 10 is more firmly screwed into the female screw hole 31B, and even if the housing 1 or the like vibrates, it is possible to provide a screwing structure in which the operating screw member 10 is more difficult to loosen. In addition, although the example of the cone-shaped protrusion was shown in the embodiment of the present invention, this is an example, and it is not limited to the shape of this example as long as it has a similar action.

DESCRIPTION OF SYMBOLS 1 ... Housing | casing, 2 ... Cover body, 3 ... Box body, 5 ... Electronic circuit unit, 6 ... Input and output terminal, 9 ... Level difference, 10 ... Operation screw part, 11 ... Shaft part, 12 ... Male screw part, 13 ... engagement protrusion, 14 ... cylindrical part, 15 ... elastic locking piece, 16 ... guide cylinder part, 16a ... end face, 16b ... circumferential surface, 16c ... concave / convex means, 17 ... slit, 18 ... cylindrical cavity, 18a ... Opening edge, 19 ... Screw head, 19a ... Operating means, 21 ... Mounting hole, 21a ... Hole edge, 23 ... Front panel, 25 ... Ring wall, 25a ... Space, 25b ... Opening end, 31 · 31A · 31B ... female screw hole, 31a and 31b ... bottom part, 32 ... female screw part, 33 ... terminal panel, 35 ... pedestal, 38 ... projection, 50 ... wall surface.

Claims (6)

A screw member configured to be temporarily held in an attachment hole formed in the attachment member and screwed into the female screw hole formed in the attachment object to screw the attachment member;
A male screw portion formed at one end of a shaft portion having an outer diameter that can be freely inserted into the mounting hole, a screw head continuously provided on the other side of the shaft portion,
An engagement protrusion provided on a cylindrical portion located between the male screw portion and the screw head and protruding in a circumferential direction of the cylindrical portion and engaging with a hole edge of the mounting hole; ,
A screw member for operation characterized by integrally including a slit formed along the axis from the tip of the shaft portion.
A screwing structure including the operating screw member according to claim 1,
The operation screw member temporarily held in the attachment hole formed in the attachment member so as to be freely inserted between the screw head and the engagement protrusion is formed into a female screw hole formed in the attachment object. A screwing structure configured to be screwed to fasten the mounting member.
The screw member for operation is provided with a guide cylinder portion provided between the cylinder portion and the screw head so as to coincide with each axis.
On the other hand, the mounting hole includes an annular wall portion that is formed to protrude on the surface facing the screw member for operation so as to coincide with the axis of the mounting hole and has a space communicating with the mounting hole. And
3. The guide cylinder according to claim 2, wherein when the operation screw member is inserted into the mounting hole, at least a part of the guide cylindrical portion is temporarily held in a state of being inserted into the annular wall portion. Screwing structure.
When the attachment member is screwed to the attachment object using the operation screw member, the operation screw member temporarily held in the attachment hole includes the attachment object and the attachment member, The length of the cylindrical portion including the engagement protrusion is formed so as to be movable in the axial direction to a position that does not disturb the state of being arranged so as to contact each other. The screwing structure according to any one of claims 3 to 4.
A diameter of the female screw hole formed in the attachment object is formed so that it can be mounted while reducing the diameter of the shaft part including at least the male screw part when the operating screw member is screwed into the female screw hole. The screw fastening structure according to any one of claims 2 to 4, wherein the screw fastening structure is formed.
The operating screw member includes a cylindrical cavity provided concentrically with the shaft portion from the tip of the shaft portion along the axis from the tip of the shaft portion to an intermediate position of the shaft portion,
On the other hand, the female screw hole is provided at a position opposite to the insertion port of the operation screw member so as to coincide with the axis of the female screw hole, and has a protruding portion protruding so as to face the operation screw member. Have
When the operating screw member is screwed into the female screw hole, the projecting portion is inserted into the cylindrical cavity from the tip of the operating screw member, so that the shaft portion including at least the male screw portion is expanded in diameter. The screw-fastening structure according to any one of claims 2 to 4, wherein the screw-fastening structure is configured so that the mounting is possible.

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