JP2007247715A - Fastening structure by screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening structure by a screw used to attach two members detachably by the screw capable of removing a male screw securely and removing both members easily when removing both members. <P>SOLUTION: In this fastening structure by the screw used to attach two members detachably by the screw, a projecting part 21a screw-fitting into a screw part 31 of a male screw 3 screw-fitting into a female screw part 11 by inserting it through a screw insertion hole 21 is provided on an inner face of the screw insertion hole 21 provided in one member 2 by corresponding to the female screw part 11 provided in the other member 1, a part 32 below a neck of the male screw 3 is formed into a part without screw, length of the screw part is formed to be larger than length between the projecting part 21a provided on the inner face of the screw insertion hole 21 and a screw hole fringe 11a of the female screw part 11 provided in the other member 1, and length of the part without screw is formed to be larger than length between an end face of the screw insertion hole on a male screw insertion side of the member 2 on one side and the projecting part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screw fastening structure used for detachably attaching two members by screws, and preferably, after attaching the other member horizontally or by sliding to one member, The present invention relates to a structure that is fastened and fixed by screws.

  As shown in FIGS. 12 and 13, a fastening structure using a screw that detachably attaches two members to each other is provided with a female screw portion 101a on one member 101, and the other member 102 corresponding to this female screw portion 101a. In general, a screw insertion hole 102a is provided in the screw insertion hole 102a, the male screw 103 is inserted through the screw insertion hole 102a and then screwed into the female screw portion 10a to fasten both members 101 and 102 (for example, Patent Document 1). 2, 3).

  However, in the case where the other member is attached to one member by rotating or sliding horizontally and then tightened and fixed with a screw, this is done when removing the other member 102 from one member 101. When the male screw 103 is rotated in the loosening direction, the screw thread at the tip end portion of the male screw 103 remains at the screw hole edge 102b of the female screw portion 101a and is not rotated and the engagement state is not released. The member 102 must be rotated or slid, and it may take time to remove the member 102 from one member 101. In addition, since the male screw 103 falls out of the screw insertion hole 102a of the other member 102 after the other member 102 is removed from the one member 101, the workability is poor and the other member 102 is attached to the one member 101 again. There is also a problem that the storage and management of the male screw 103 is troublesome.

JP 2002-155918 A (FIG. 6) JP 2002-168217 A (FIG. 3) JP 2002-54617 A (FIGS. 4 to 6)

  The present invention solves the above-described problems, and in a fastening structure with screws used for detachably attaching two members with screws, when removing both members, the male screw is surely removed and both members are easy. It was completed for the purpose of providing a fastening structure with screws that can be removed.

  The screw-fastening structure of the present invention is a screw-fastening structure used for attaching two members detachably with screws, and a screw insertion hole provided in the other member corresponding to the female screw portion provided in one member The inner surface of the screw is provided with a protruding portion that engages with the threaded portion of the male screw that is inserted through the screw insertion hole and is threaded into the female threaded portion, and the neck portion of the male screw is formed as a non-threaded portion. Is formed longer than the length between the protruding portion provided on the inner surface of the screw insertion hole and the screw hole edge of the female screw portion provided on one member, and the length of the non-threaded portion is set to the male screw insertion side of the other member. This is characterized in that the length is longer than the length of the end face of the screw insertion hole and the protrusion.

The present invention as described above is a male screw that is inserted into the inner surface of a screw insertion hole provided in the other member corresponding to the female screw portion provided in one member and is screwed into the female screw portion. Protrusions that engage with the threaded portions are provided, the lower neck portion of the male screw is formed as an unthreaded portion, the length of the threaded portion is provided on the inner surface of the screw insertion hole, and the female threaded portion provided on one member Since it is formed longer than the length between the screw hole edge, when removing the other member from one member, if the male screw is turned in the loosening direction, the thread at the tip of the male screw will be Even if the screw hole edge is reached, since the male screw is screwed with the projection, the male screw is screwed in the loosening direction by this projection, the engagement state of the tip is released, and the male screw is provided on one member The other member can be removed securely from the female screw part. .

  In addition, since the male screw is screwed with the protrusion even after the male screw is removed from the female screw portion, the male screw does not fall out of the screw insertion hole of the other member. There is an advantage that the male screw can be stored and managed easily when it is attached to the member.

  Furthermore, since the length of the non-threaded portion of the male screw is longer than the length of the screw insertion hole end surface on the male screw insertion side of the other member and the protruding portion, the protrusion provided on the other member when the screw is tightened Since the part a is located in the non-threaded part of the male screw, the projection part is not likely to be damaged.

Next, a preferred embodiment of the present invention will be described with reference to a ventilation device for an electric equipment storage box in which two members of a main body and a cover are detachably attached by screws.
Reference numeral 1 denotes one member which is a main body, and the one member 1 is provided with a female screw portion 11. The other member 2 is a cover, and the other member 2 is provided with a screw insertion hole 21 corresponding to the female screw portion 11. A projection 21 a is formed on the inner surface of the screw insertion hole 21. The protrusion 21 a is screwed with the screw portion 31 of the male screw 3 that is inserted through the screw insertion hole 21 and screwed into the female screw portion 11. In addition, although the thing of illustration shows the structure directly provided in the one member 1, the internal thread part 11 may embed another nut member. Moreover, although the protrusion part 21a is provided in the protruding item | line on the circular arc as shown in FIG. 11, as long as the trough part of the thread part 31 of the external thread 3 can engage, you may provide in dot shape. Further, in this embodiment, the main body 1 is provided with a cylindrical portion (not shown) having a groove portion for attaching the cover 2, and the cover 2 is rotated 45 degrees from the state shown in FIG. As shown in FIG. 1, the screw is attached to the main body 1 and the positions of the female screw portion 11 and the screw insertion hole 21 are matched and fixed with the male screw 3.

  Further, as shown in FIG. 5, the male screw 3 is formed with the neck lower part 32 as a non-threaded part, and the length (L) of the threaded part 31 is provided on the inner surface of the screw insertion hole 21 and one member. 1 is slightly longer (several millimeters) than the length (M) between the female screw part 11 and the screw hole edge 11a, and as shown in FIG. The length (A) is longer than the length (B) between the screw insertion hole end face 21b and the projection 21a on the male screw insertion side of the other member 2. That is, as shown in FIG. 1, when the male screw 3 is tightened, the protrusion 21a is formed in such a length that it is positioned at the non-threaded portion. Further, as shown in FIG. 7, the threaded portion 31 of the male screw 3 has a deformed shape that is substantially the same position as the length of the screw insertion hole 21 of the other member 2 from the screw hole edge 11a of the female threaded portion 11 and is different from the normal threaded portion. Formed in the portion 33. That is, in the illustrated example, the deformed portion 33 has a single thread portion as a non-threaded portion, but may be a deformed mountain portion.

When the other member 2 that is the cover is removed from the one member 1 that is the main body, the male screw 3 is initially removed when the male screw 3 is rotated in the loosening direction from the state shown in FIG. Since many pitches of the threaded portion 31 are screwed with the female threaded portion 11, as shown in FIGS. 2 and 3, the threaded portion 31 rotates in the loosening direction regardless of the protruding portion 21 a. Since the length (L) of the screw portion 31 is slightly longer (several millimeters) than the length (M) of the female screw portion 11 and the screw hole edge 11a, the thread at the tip of the male screw 3 is the female screw. Before reaching the screw hole edge 11a of the portion 11 and being unable to feed the screw by the female screw 11, the screw portion 31 of the male screw 3 is screwed with the protruding portion 21a, so that the male screw 3 is loosened by the protruding portion 21a. Further, as shown in FIG. 4, the screwed state is released and the male screw 3 is reliably removed from the female screw portion 11 provided on one member 1, and the other member 2 is rotated or slid. The member 1 can be removed.

  Further, even after the male screw 3 is completely removed from the female screw portion 11, the male screw 3 does not fall out of the screw insertion hole 21 of the other member 2 because it is screwed with the protrusion 21a. When the member 2 is attached to one member 1, the male screw 3 can be easily stored and managed, and it is not necessary to insert the screw even during attachment, so that an efficient operation can be performed.

  Further, as shown in FIG. 5, the male screw 3 is formed with the neck lower part 32 as a non-threaded part, and the length (L) of the threaded part 31 is provided on the inner surface of the screw insertion hole 21 and one member. 1 is slightly longer (several millimeters) than the length (M) between the female screw portion 11 and the screw hole edge 11a, so that the male screw 3 is inserted through the screw insertion hole 21 and screwed into the female screw portion 11. In this case, the screwing distance with the protrusion 21a can be minimized, and the screwing operation can be fast. Even if the tip of the male screw 3 reaches the tip of the female screw 11 when the male screw 3 is rotated in the loosening direction, the male screw Thus, it is possible to ensure that the three screw portions 31 are screwed into the protruding portions 21a.

  Furthermore, by making the thread portion 31 of the male screw 3 substantially the same position as the length of the screw insertion hole 21 of the other member 2 from the screw hole edge 11a of the female screw portion 11, a deformed portion 33 different from the normal thread portion is obtained. By visually confirming that the deformed portion 33 is exposed from the screw insertion hole 21 when the male screw 3 is removed, it can be confirmed that the screw portion 31 of the male screw 3 is surely removed from the female screw portion 11.

  Further, as shown in FIG. 8, when the tip of the male screw 31 is disengaged from the screw hole edge 11a of the female screw portion 11, the protruding portion 21a is formed between the first screw portion 31a and the second screw portion 31b. If the operator is positioned at the unthreaded portion 32b provided between them, the operator can confirm that the tip of the male screw 31a has been detached from the screw hole edge 11a of the female screw portion 11 with a sense transmitted to the hand. Since there is no risk of the screws falling off, the workability is excellent.

  Further, the length (A) of the screwless portion 32b of the neck lower portion 32 is longer than the length (B) of the screw insertion hole end surface 21b and the protruding portion 21a on the male screw insertion side of the other member 2. That is, when the male screw 3 is tightened, the protruding portion 21a is formed in such a length as to be positioned at the non-threaded portion 32b. Therefore, when the screw is tightened, the protruding portion 21a provided on the other member 2 is the male screw 3. Therefore, the protrusion 21a is not likely to be damaged.

Sectional drawing of the principal part which shows embodiment of this invention. Sectional drawing of the principal part which shows the initial stage of the process of removing the external thread of embodiment of this invention. Sectional drawing of the principal part which shows the middle stage of the process of removing the external thread of embodiment of this invention. Sectional drawing of the principal part which shows the last stage of the process of removing the external thread of embodiment of this invention. Explanatory drawing of the relationship between the external thread and projection part of embodiment of this invention. Explanatory drawing of the non-thread part and projection part of the external thread of embodiment of this invention. Sectional drawing which shows the other examples of embodiment of this invention. Sectional drawing which shows the further another example of embodiment of this invention. The perspective view which shows the ventilation apparatus of the electric equipment storage box which uses this invention. The perspective view which shows the ventilation apparatus of the electric equipment storage box which uses this invention. The perspective view which shows the principal part of the ventilation apparatus of the electric equipment storage box which uses this invention. Sectional drawing which shows a prior art example. Sectional drawing which shows a prior art example from a different aspect.

Explanation of symbols

One member
11 Female thread 2 The other member
21 Screw insertion hole
21a Protrusion 3 Male thread
31 Screw part
32 lower neck
33 Deformation

Claims (1)

  In the fastening structure with screws used for detachably attaching the two members with screws, the inner surface of the screw insertion hole provided in the other member corresponding to the female screw portion provided in one member from the screw insertion hole Protrusions that are threaded into the threaded part of the male screw that are inserted and threaded into the female threaded part are provided, the lower part of the neck of the male screw is formed as a non-threaded part, and the length of the threaded part is provided on the inner surface of the screw insertion hole. And the length of the screw-free hole on the male screw insertion side of the other member and the protruding portion are formed longer than the length between the protruding portion and the screw hole edge of the female screw portion provided on one member. A screw tightening structure characterized by being longer than the length of the screw.

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