JP2006280096A - Fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent light from entering an enclosure through a through hole when a cord clamp is installed in the through hole. <P>SOLUTION: A holding frame 11, an insertion portion 13, a retaining protrusion 24, and a flange portion 12 are integrally formed of an elastic body having a light blocking property to construct a cord clamp 10. The length of the insertion portion 13 is made smaller than the length of the through hole 25 (the thickness of the enclosure 24). The retaining protrusion 14 is inserted into the through hole 25 formed in the enclosure 24 from inside the enclosure 14, and the retaining protrusion 24 is protruded to outside the enclosure 24. The retaining protrusion 14 is anchored to the rim of the through hole 24, and the cord clamp 10 is thereby installed in the through hole 25. Since the through hole 25 is covered and closed with the flange portion 12, the light blocking effect is maintained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fastener that is attached to a housing by sandwiching a plate material between a holding portion and a retaining portion via a through hole.

  In recent years, various types of electronic devices have been demanded to have a wide variety. Therefore, such a request is addressed by sharing the main parts in the electronic device and combining peripheral parts according to each specification. For example, a power supply circuit and various processing circuits constituting an electric device are unitized, and an electronic device is configured by incorporating each unit in accordance with a desired specification. Thus, as unitization progresses, the number of lead wires connecting between units increases. These lead wires are routed at predetermined positions such as in a casing of an electronic device or a wiring board. Therefore, these lead wires are held by fasteners attached at predetermined positions in the housing.

  For example, a through-hole for attaching a fastener is formed at a predetermined position in a housing formed of sheet metal. The fastener is attached to the housing by press-fitting a retaining portion into the through hole from the inside of the housing, and sandwiching the sheet metal by the retaining portion and the retaining portion that hold the lead wires. The fastener attached to the housing holds a plurality of lead wires bundled together by a holding portion. However, among electronic devices, a scanner or a photo developing device needs to shield the inside of the housing. When a fastener is attached to the housing of the photo developing device using the above-described method, light enters the housing from the gap between the through hole and the fastener. Therefore, in the scanner or the photo developing device, as shown in FIG. 8, the bracket 3 having the through hole 3a is attached to the inner wall surface 2a of the housing 2 by welding or the like without forming the through hole in the housing 2. The fastener 5 was attached via the bracket 3. The fastener 5 is attached to the bracket 3 by inserting the insertion portion 5a into the through hole 3a and locking the retaining portion 5b to the hole edge. In the holding frame 5c of the fastener 5, codes such as the lead wire 6 are put and held.

  However, attaching the fastener 5 using the dedicated bracket 3 increases the number of parts and the number of mounting steps, leading to an increase in cost. Further, there is a problem that the lead wire 6 is also routed in a place where the bracket 3 is restricted from being attached, and the degree of freedom in routing the lead wire 6 is impaired.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a fastener that prevents light from entering a housing through a through hole formed in the housing.

  In order to achieve the above object, a fastener according to the present invention includes a holding portion that holds a member to be held, and a through hole formed in the plate member that is connected to the holding portion and is formed in the plate member that constitutes the housing. An insertion portion that is inserted from one surface side to the other surface side, and a retaining portion that is connected to the insertion portion on the other surface side and prevents the insertion portion from being pulled out to the one surface side. A fastener that sandwiches the plate material between the holding portion and the retaining portion and is attached to the housing, and further includes a shielding portion that covers the through hole between the retaining portion and the retaining portion. Is. Moreover, it is preferable that the said shielding part is formed with the elastic body.

  Moreover, it is preferable that the said shielding part is integrally formed in the said insertion part. Further, the shielding part may have an insertion hole into which the insertion part is inserted, and the shielding part may be detachably attached between the holding part and the retaining part through the insertion hole. Moreover, the said insertion part, the said shielding part, and the said securing part may be formed integrally, and the said holding | maintenance part may be made to attach to the said insertion part so that attachment or detachment is possible. The shield may be a flange having a substantially disc shape or a substantially umbrella shape. Further, the retaining portion is formed of an elastic body having an insertion guide surface at the tip, has a diameter larger than the diameter of the through hole, and is pressed into the through hole so that the retaining portion is pulled out to the other surface side. You may do it.

  The diameter of the through hole is d, the diameter of the shielding part is Df, the diameter of the insertion part is Dc, the plate thickness of the plate member is t, and the length of the insertion part from the shielding part to the retaining part is When Tc is satisfied, it is preferable that 1.5d ≦ Df ≦ 10d, Dc ≦ 1.2d, and Tc <t.

  In the fastener of the present invention, in the fastener that is sandwiched between the holding part and the retaining part and attached to the housing through the through hole, the fastener is attached by including a shielding part that covers the through hole between the retaining part and the retaining part. It is possible to prevent light from entering the housing from the through hole without using a bracket or the like. Furthermore, by forming the light shielding portion with an elastic body and making it a substantially disc-shaped or substantially umbrella-shaped flange, it is possible to prevent light from entering the housing more through the through hole.

  In addition, the retaining portion is formed of an elastic body having an insertion guide surface at the tip, has a diameter larger than the diameter of the through hole, and is pressed into the through hole so that the retaining portion is pulled out to the other surface side. Incident of light from the through hole into the housing is blocked.

  Further, when the diameter of the through hole is d, the diameter of the shielding part is Df, the diameter of the insertion part is Dc, the plate thickness of the plate member is t, and the length from the shielding part to the retaining part of the insertion part is Tc, 1 .5d.ltoreq.Df.ltoreq.10d, Dc.ltoreq.1.2d, and Tc <t are satisfied, so that the inside of the housing is reliably shielded from light.

  In FIG. 1 showing a cord clamp 10 as a fastener of the present invention, the cord clamp 10 includes a holding frame 11 as a holding portion, a flange portion 12 as a shielding portion, an insertion portion 13, and a retaining protrusion 14 as a retaining portion. These are integrally formed of an elastic body such as a resin (nylon or the like) that hardly transmits light or an elastomer.

  The holding frame 11 is formed in a rectangular shape by connecting a substantially U-shaped holding frame main body 20 and a lid member 21 via a thin hinge portion 20a, and has a lead wire 27 (see FIG. 3) inside. Hold cords and cables. The lid member 21 is displaced between a closed position where the opening of the holding frame main body 20 is closed and an open position where the opening is opened and the cord can be inserted. In order to prevent the lid member 21 from being opened at the closed position, a locking claw 20b is formed at one end of the holding frame body 20, and a pair of clamping pieces 21a, 21b and a locking hole 21c are formed at the tip of the lid member 21. Has been. When the lid member 21 is closed, one end of the holding frame main body 20 is clamped by the pair of clamping pieces 21a and 21b. In this clamping state, the locking claw 20b is locked in the locking hole 21c, thereby preventing the lid member 21 from being opened. The lid member 21 is opened by lifting the outer holding piece 21a to release the engagement between the engagement claw 20b and the engagement hole 21c. In addition, you may change suitably the shape of the holding frame 11, the holding method of cords, the latching method of the cover member 21, etc. FIG.

  The flange portion 12 is formed in a disc shape and is formed at the lower portion of the holding frame 11. The insertion portion 13 is formed so as to protrude from the lower center of the flange portion 12, and a truncated conical retaining protrusion 14 is formed at the tip of the insertion portion 13. A recess 15 is formed in the lower end surface of the retaining protrusion 14 up to the insertion portion 13. The recess 15 facilitates elastic deformation of the retaining projection 14 and the insertion portion 13 when the retaining projection 14 and the insertion portion 13 are inserted into the through hole 25 of the housing 24. And the cord clamp 10 is attached to the housing | casing 24 because the retaining protrusion 14 latches in the hole edge part of the through-hole 25. FIG. The flange portion 12 covers the through hole 25 and prevents light from entering through the through hole 25.

  Next, the dimensions of the cord clamp 10 and the through hole 25 formed in the housing 24 will be described with reference to FIG. The housing 24 is formed of, for example, a sheet metal. When the diameter of the through hole 25 formed in the sheet metal is d and the sheet thickness of the sheet metal is t, the upper surface of the retaining protrusion 14 provided continuously with the insertion portion 13. The diameter D of 14a is D ≦ 2d. The diameter Df of the flange portion 12 is 1.5d ≦ Df ≦ 10d, and the thickness Tf of the flange portion 12 is arbitrary. Preferably, 1.5d ≦ Df ≦ 4d. The diameter Dc of the insertion portion 13 is Dc ≦ 1.2d, and the insertion portion length Tc from the bottom surface of the flange portion 12 to the upper surface 14a of the retaining projection 14 may be Tc ≦ t, preferably 0, 8t ≦ Tc ≦ 0, 9t. Note that if Df exceeds 10d, it becomes larger than the width Wc of the cord clamp 10 and does not contribute to improvement of the light shielding performance for an increase in the amount of material. Therefore, Df is preferably 10d or less or Wc or less. . Further, by setting the range of 1.5d ≦ Df ≦ 4d, the balance between the amount of raw materials and the light shielding property is achieved, and efficient light shielding is possible.

  When the cord clamp 10 is attached to the casing 24, the retaining protrusion 14 is elastically deformed and inserted into the through hole 25 from the inside of the casing 24 as shown in FIG. When the retaining projection 14 passes through the through hole 25, the retaining projection 14 returns to its original size due to the restoring force, and the upper surface 14a and the outer wall surface 24a of the housing 24 are in close contact with each other, as shown in FIG. At this time, since the insertion length Tc of the insertion portion 13 is slightly shorter than the sheet thickness t of the sheet metal, the lower surface of the flange portion 12 and the inner wall surface 24b of the housing 24 are in close contact with each other. As a result, the through hole 25 is covered with the flange portion 12 inside the housing 24, and the through hole 25 is covered with the retaining projection 14 outside the housing 24, so that light is transmitted from the through hole 25 into the housing 24. Does not enter.

  When the cord clamp 10 is attached to a predetermined position of the housing 24, the lead wire 27 routed in the housing 24 is held by the holding frame 11 of the cord clamp 10. In this case, the outer clamping piece 21a of the lid member 21 is pulled to unlock the locking hole 21c and the locking claw 20b, and the lid member 21 is opened as shown by a two-dot chain line to hold the holding frame main body. A plurality of lead wires 27 are bundled and accommodated in 20. Thereafter, the lid member 21 is closed as indicated by the solid line, and the lead wire 27 is held by the holding frame 11.

  In the above embodiment, the cord clamp 10 is integrally formed of an elastic body made of the same material, but instead of this, the holding frame 11 and portions other than the holding frame 11 (the flange portion 12, the insertion portion 13, and the retaining projection 14). May be different materials. In this case, for example, an elastomer such as resin or rubber that is more easily elastically deformed than the holding frame 11 is used for the flange portion 12, the insertion portion 13, and the retaining projection 14. In order to integrally form the cord clamp 10 using different materials, it is preferable to use a two-color molding method. By using this two-color molding method, the elastic bodies of different materials are firmly bonded to each other, and the cord clamp can be easily formed integrally.

  Further, as shown in FIG. 4A, parts other than the flange part 12 may be integrally formed, and the flange part may be detachable from the insertion part 13. In this case, the cord clamp 30 includes a holding frame 11 formed integrally, an insertion portion 13, a retaining protrusion 14, and a flange 31 formed detachably.

  The flange 31 is formed of an elastic body that does not easily transmit light, and has a substantially umbrella shape in which a central portion of the flange 31 swells upward. The outer diameter of the flange 31 is formed with substantially the same dimensions as the flange portion 12 described above, and can sufficiently cover the through hole 25. The insertion hole 36 formed in the flange 31 is formed slightly smaller than the diameter Dc of the insertion portion 13. Therefore, when the flange 31 is attached to the insertion portion 13, the insertion hole 36 of the flange 31 and the insertion portion 13 are in close contact with each other as shown in FIG. 4B. Moreover, by setting it as substantially umbrella shape, spring property can be provided to the flange 31 main body, and a contact | adhesion degree increases further.

  After the flange 31 is attached to the insertion portion 13, when the retaining protrusion 14 is inserted into the through hole 25, the retaining protrusion 14 is elastically deformed and penetrates the through hole 25, and the upper surface 14 a of the retaining protrusion 14 is the outer wall surface of the housing 24. Lock to 24a. The through hole 25 is covered with the retaining protrusion 14 outside the housing 24, and the through hole 25 is covered with the flange 31 inside the housing 24, so that light enters the inside of the housing 24 from the through hole 25. There is nothing. Although the flange 31 has a substantially umbrella shape, it may have a disk shape.

  In FIG. 4, the retaining protrusion 14 is inserted into the through hole 25 after the flange 31 is attached to the insertion portion 13. Instead, the retaining protrusion 14 is inserted into the through hole 25 before the flange 31 is attached to the insertion portion 13. The flange 31 may be attached to the insertion portion 13 from the outside of the housing 24 by being inserted. In this case, since the through hole 25 is covered with the flange 31 on the outer wall surface 24a side of the casing 24, light does not enter the casing 24 from the through hole 25. Furthermore, a commercially available cord clamp may be used for the holding frame 11, the insertion portion 13, and the retaining protrusion 14. In this case, a substitute cord clamp is selected based on the diameter d of the through hole 25 formed in the housing 24 and the dimension of the sheet thickness t (see FIG. 2) of the sheet metal, and the flange is matched to the selected cord clamp. It is preferable to appropriately change the size of the 31 holes 36.

  As shown in FIG. 2, a recess 15 is provided at the tip of the retaining protrusion 14 to reduce the insertion resistance when the retaining protrusion 14 is inserted into the through hole 25. Instead of this, FIG. ), The cross groove 35 may be formed along the axial center of the retaining protrusion 14 and the insertion portion 12. Note that the grooves may be Y-shaped grooves with a 120 ° pitch, I-shaped grooves with a 180 ° pitch, or other various pitched groove shapes instead of the cross grooves 35 arranged at a 90 ° pitch.

  The retaining protrusion 43 in FIG. 5B has three conical guide surfaces 43a formed in three stages, and an I-shaped groove 44 is formed along the axis. Further, in FIG. 5C, the retaining projection 46 is formed by forming a hemispherical guide surface 46a in place of the conical guide surface, and a concave portion 46b for facilitating elastic deformation is formed in the central portion. ing.

  FIG. 6 shows another embodiment in which the bush 51 including the flange portion, the insertion portion, and the retaining portion and the holding frame 52 are configured separately. A commercially available cord clamp 50 can be used as the holding frame 52, and the holding portion 52 is configured by the holding frame main body 20, the lid member 21, and the fixing protrusion 53. The fixing protrusion 53 protrudes downward from the lower surface of the holding frame main body 20, and fixes the holding frame 52 to the bush 51 by engaging with a fixing hole 55 provided in the bush 51 described later.

  The bush 51 is made of an elastic material that does not easily transmit light. The flange portion 59 and the retaining protrusion 60 are integrally formed on the insertion portion 58. The insertion portion 58 has an outer diameter that is slightly smaller than the diameter of the through hole 25 formed in the housing 24, and a flange portion 59 is formed on the upper portion thereof. The flange portion 59 has an outer diameter larger than the diameter of the through hole 25. A fixing hole 55 and a rotation stop protrusion 62 are provided on the upper surface of the flange portion 59. The fixing hole 55 communicates with the inside of the insertion portion 58, and is formed by, for example, an undercut molding method when the bush 51 is formed by injection. The anti-rotation protrusion 62 disposes the holding frame 52 between the anti-rotation protrusions 62 and fixes the holding frame 52 to the bush 51, thereby restricting the rotation of the holding frame 52 around the fixing protrusion 53. . The retaining protrusion 60 is formed to protrude obliquely upward from the peripheral surface of the insertion portion 58.

  When the cord clamp 50 having the above configuration is attached to the housing 24, the bush 51 is first inserted into the through hole 25 as shown in FIG. At this time, since the retaining protrusion 60 is pressed against the peripheral surface of the insertion portion 58 by the through hole 25, the insertion portion 58 is elastically deformed and inserted into the through hole 25. When the retaining protrusion 60 passes through the through hole 25, the retaining protrusion 60 comes into contact with the outer wall surface 24 a of the housing 24. At this time, the flange portion 59 is in contact with the inner wall surface 24 b of the housing 24, and the through hole 25 is covered with the flange portion 59.

  Next, as shown in FIG. 7B, the holding frame 52 is disposed between the rotation stop protrusions 62 and the fixing protrusions 53 are engaged with the fixing holes 55. Thereby, the holding frame 52 is fixed to the bush 51, and the cord clamp 50 is attached to a predetermined position of the housing 24. Then, the engagement between the engagement hole 21 c and the engagement claw 20 b shown in FIG. 6 is released, the lid member 21 is displaced from the closed position to the open position, and the lead wire 27 is held in the holding frame body 20. Then, by engaging the engagement hole 21c and the engagement claw 20b again at the closed position, the lead wire 27 is bundled at a predetermined position of the casing 24 by the cord clamp 50 as shown in FIG. Therefore, by attaching the cord clamp 50 to the housing 24, it is possible to prevent light from entering the housing 24 from the through hole 25.

  In each of the above embodiments, the cord clamp is attached to the inside of the housing 24 and the lead wire 27 routed inside the housing 24 is held. However, the cord clamp is attached to the outside of the housing 24 to The lead wire 27 routed outside the body 24 may be held. Also in this case, since the through hole 25 of the housing 24 is covered by the flange portion, it is possible to prevent light from entering the housing 24 from the through hole 25. Moreover, although the lead wire 27 is held by the holding frame of the cord clamp, the present invention is not limited to this, and an optical fiber cable, a tube, or the like may be held.

  Further, the flange portion covers the through hole 25, and the flange portion and the inner wall surface of the housing 24 are brought into contact with each other to prevent light from entering the housing 24 from the through hole 25. It is also possible to waterproof or moisture-proof the inside of the housing 24 by improving the close contact state between the portion and the inner wall surface.

It is an external appearance perspective view which shows the structure of the cord clamp integrally formed with the elastic body. It is a front view which shows the dimension of a cord clamp. It is a front view explaining the attachment state of a cord clamp. It is sectional drawing which shows the structure of the cord clamp provided with the detachable flange. It is the front view and top view explaining the shape of a securing protrusion. It is an external appearance perspective view which shows the structure of the cord clamp which consists of a holding frame and a bush. It is sectional drawing explaining the attachment state of the cord clamp shown in FIG. It is sectional drawing explaining the attachment method of the conventional cord clamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Code clamp 11 Holding frame 12 Flange part 13 Insertion part 14 Stop protrusion 24 Case 25 Through-hole 51 Bush

Claims (8)

A holding portion for holding the held member;
An insertion portion that is connected to the holding portion and is inserted from one surface side of the plate material to the other surface side in a through-hole formed in the plate material constituting the housing;
The other surface side is connected to the insertion portion, and includes a retaining portion that prevents the insertion portion from coming off to one surface side,
In the fastener attached to the housing by sandwiching the plate material at the holding portion and the retaining portion,
A fastener comprising a shielding portion that covers the through hole between the holding portion and the retaining portion.   The fastener according to claim 1, wherein the shielding portion is formed of an elastic body.   The fastener according to claim 1 or 2, wherein the shielding portion is formed integrally with the insertion portion.   The said shielding part has an insertion hole in which the said insertion part is inserted, It is detachably attached between the said holding | maintenance part and the said retaining part through this insertion hole, The Claim 1 or 2 characterized by the above-mentioned. Fastener.   The fastener according to claim 1 or 2, wherein the insertion portion, the retaining portion, and the shielding portion are integrally formed, and the holding portion is detachably attached to the insertion portion.   6. The fastener according to claim 1, wherein the shielding portion is a flange having a substantially disc shape or a substantially umbrella shape.   The retaining portion is formed of an elastic body having an insertion guide surface at the tip, has a diameter larger than the diameter of the through hole, and is pressed into the through hole so that the retaining portion is pulled out to the other surface side. The fastener according to any one of claims 1 to 6, characterized in that The diameter of the through hole is d, the diameter of the shielding part is Df, the diameter of the insertion part is Dc, the plate thickness of the plate member is t, and the length of the insertion part from the shielding part to the retaining part is Tc. When
1.5d ≦ Df ≦ 10d,
Dc ≦ 1.2d,
Tc <t,
The fastener according to any one of claims 1 to 7, wherein:

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