JP4449626B2 - Retaining bushings and lighting fixtures - Google Patents

Description

  The present invention relates to a retaining bushing and a lighting fixture.

  When attaching a lighting fixture to a ceiling hanging bolt, the first conventional example is to provide a mounting hole made of, for example, a round hole of φ20 mm or a long hole of 12 mm × 20 mm, for example, in the fixture body, and penetrate the mounting hole through the mounting bolt And tighten the nut through the washer to fix the lighting fixture to the edge of the ceiling embedding hole.

  In the second conventional example, a droop hole consisting of a large hole portion and a small hole portion is provided in the instrument body, and a nut and a washer screwed into the suspension bolt are inserted into the large hole section of the droop hole, and the instrument body is moved to move the suspension bolt. Is moved to the small hole, the nut is locked to the hole edge, and the nut is tightened. In addition, there may be provided a protrusion that prevents the nut from moving from the small hole portion to the large hole portion. Since the 2nd prior art example can temporarily fix an instrument main part, it is labor-saving construction. In particular, in recent years, lighting fixtures with holes that are stagnant for the purpose of saving construction are increasing.

As a retaining member for preventing the bolt and the washer from moving from the small hole portion of the saddle hole to the large hole portion as the nut and the washer get over the protruding portion, a third conventional example is shown in FIG. A retaining bushing 102 is provided in advance in the large hole portion 101. The retaining bushing 102 has a pair of elastic locking pieces 104 extending from both sides of the boundary between the large hole portion 101 and the small hole portion 103 to the center of the boundary and having a tip projecting from the large hole portion 101 side to the small hole portion 103 side. When the suspension bolt inserted through the large hole portion 101 is moved to the small hole portion 103, the pair of elastic locking pieces 104 can be opened and moved to the small hole portion 103, but when moving in the opposite direction The pair of elastic locking pieces 104 are closed and difficult to move, and the suspension bolt is prevented from moving from the small hole portion 103 to the large hole portion 101 (see Patent Document 1).
JP-A-7-73721

  In the first conventional example, the mounting hole of the instrument body is passed through the suspension bolt and the nut is tightened via the washer. Therefore, when the weight of the instrument is large, the workability is poor.

  The second conventional example has good workability because it can be temporarily fixed as described above, but the nuts and washers of the suspension bolts are prevented from moving when the nuts are not sufficiently tightened or when there is an earthquake or vibration. There is a possibility of overcoming the projections for use.

  In the third conventional example, the retaining bushing 102 can prevent the suspension bolt from moving from the small hole portion 103 to the large hole portion 101, but the large hole portion 101 of the dart hole 100 is previously removed before being inserted into the suspension bolt. It is necessary to attach the stop bushing 102 to the large hole portion 101, and when the instrument is installed, the retaining bushing 102 is detached and lost, or when the suspension bolt is inserted through the large hole portion 101 at the time of instrument installation. The retaining bushing 102 may come into contact with the suspension bolt and the retaining bushing 102 may come off, and when the suspension bolt is moved from the large hole portion 101 to the small hole portion 103, it passes through the elastic locking portion 104 resisting its elasticity. Because it is necessary to do, workability is worsened. Further, when the length of the small hole portion 103 in the direction approaching and separating from the large hole portion 101 is shortened, the nut and the washer approach or enter the large diameter portion 101 side, so that the washer gets stuck on the retaining bushing 102. There is a case where the washer cannot be locked by the retaining bushing 102 after being fixed. When the retaining bushing 102 does not lock the nut, the washer, etc., but only the suspension bolt, the suspension bolt pushes the elastic locking portion 104 to push the elastic locking portion 104 toward the large hole portion 101 side. There is also a fear. On the other hand, when the small hole portion 103 is lengthened, the strength of the instrument body is weakened.

  Accordingly, an object of the present invention is to provide a retaining bushing and a lighting device that are easy to work, can prevent the device from dropping, and can lock the washer with the bushing without lengthening the small hole portion. is there.

The retaining bushing according to the present invention is attached to the large hole portion of the spar hole composed of a large hole portion provided in a suspended body suspended by a suspension material and a small hole portion continuous thereto, and is attached to the suspension material. When the perimeter of the small hole portion is placed on a bolt having a nut, a nut with a washer, a bolt head or a head with a washer, and the suspended body is in a locked state, the bolt is not in the small hole. The movement from the portion to the large hole portion is prevented. The press-fit portion has elasticity to press-fit the large hole portion from the hole axial direction and close the large hole portion. The collar portion is formed at the rear end of the press-fit portion, and is engaged with the periphery of the large hole portion in a state where the press-fit portion is press-fitted into the large hole portion. The notch is formed in the collar part or both the press-fitting part and the collar part, and faces the small hole part in a state where the press-fitted part is press-fitted into the large hole part, and the nut of the small hole part, Escape the bolt head, the nut with washer or the head with washer.

  In the above configuration, the edge of the round hole has a washer movement preventing projection at the boundary between the small hole and the large hole, and the collar hits the projection to rotate the press-fit portion. Has a protrusion to prevent.

  In the above configuration, the notch has an inclination to press the collar against the periphery of the large hole when the nut, the bolt head, or the washer hits the notch.

  In the above-described configuration, the press-fit portion has a concave portion that opens to the end surface on the collar portion side, and a grip portion that extends in a direction away from the notch portion from the notch portion protrudes from the notch portion.

  The luminaire of the present invention has a saddle hole fitted with the retaining bushing.

  According to the retaining bushing of the present invention, for example, the bolt is moved from the large hole portion to the small hole portion, and the bolt head, the head with the washer, the nut screwed to the bolt or the nut with the washer is attached to the edge of the small hole portion. Lock and install a retaining bushing in the large hole in this state. Thereby, an instrument fall can be prevented with sufficient workability. Moreover, since the cutout bushing is provided with a notch, the nut and washer can be locked with the bushing, and when the bolt is moved to the small hole and the bolt is attached to the large hole, the lockout bushing is the washer. Since it does not overlap, the retaining bushing is not removed with a washer.

  Providing a protrusion for preventing the press-fitting portion from rotating can prevent the retaining bushing from coming off from the large hole portion due to the pivoting of the retaining bushing.

  When the notch is inclined, the collar is pressed against the edge of the large hole when the washer hits the notch, so the retaining bushing comes off the large hole when the washer hits the notch. Can be prevented.

  When the gripping portion is provided in the recess of the retaining bushing, the retaining bushing can be easily attached and the notch portion can be reinforced by the gripping portion.

  A first embodiment of the present invention will be described with reference to FIGS. First, a lighting fixture that is a suspended body and its construction will be described. The main body 2 is provided with a ballast 8 and a terminal block 9 at the center, a boring hole 3 is formed between the ballast 8 and both ends of the main body 2, and lamp sockets 11 are attached to both ends of the main body 2. . Further, a reflector 10 is attached to the fixture body 2 so as to cover the ballast 8, the terminal block 9, and the daruma hole 3, and a straight tube lamp is interposed between the lamp sockets 11 protruding from both ends of the reflector 10 to the front side of the reflector 10. 12 is mounted. A power line 13 is connected to the terminal block 9.

  The ceiling plate 4 to which the lighting fixture is attached is provided with an embedded hole 5 at the position of the suspension bolt 1 suspended from the ceiling casing (base) as a suspension material, and the fixture body 2 is fitted into the embedded hole 5 so The large hole portion 14 of the hole 3 is inserted, the nut body 7 screwed into the suspension bolt 1 and the washer 6 attached to the nut 7 are tightened to fix the instrument body 2 to the embedded hole 5.

  The hole 3 of the instrument body 2 is smaller than the large hole portion 14 communicating with the large hole portion 14 through which the nut 7 screwed through the suspension bolt 1 and the washer 6 attached to the nut 7 are inserted. The nut 7 and the washer 6 are not inserted by width, but are constituted by a small hole portion 15 through which the suspension bolt 1 is inserted. A protrusion 16 is provided at the boundary between the large hole portion 14 and the small hole portion 15 at the edge of the saddle hole 3 to prevent the nut 7 and the washer 6 from moving from the small hole portion 15 to the large hole portion 14.

  The retaining bushing 20 is attached to the large hole portion 14 of the darling hole 3 of the instrument body 2 that is inserted into the suspension bolt 1. This retaining bushing 20 is an elastic material using, for example, rubber or elastic resin, and includes a press-fit portion 17 and a flange portion 18 protruding from the outer periphery of the rear end portion of the press-fit portion 17. The flange portion 18 side of the press-fit portion 17 is formed with a concave portion 19, and the press-fit portion 17 is formed in a circular substantially dome-like shape matching the large hole portion 14, thereby improving the elasticity. By pressing the flange portion 18 side of the press-fit portion 17 by hand and using the elasticity to push into the large hole portion 14 from the tip, the press-fit portion 17 is press-fitted into the large hole portion 14 to close the large hole portion 14. The collar portion 18 is engaged with the periphery of the large hole portion 14 in a state where the press-fit portion 17 is press-fitted into the large hole portion 14. The notch portion 21 is formed by cutting a part of the circumferential surface including the press-fit portion 17 and the flange portion 18 in a plane parallel to the axial direction, and is small in a state where the press-fit portion 17 is press-fitted into the large hole portion 14. The nut 7 and the washer 6 that face the hole 15 and are located in the small hole 15 escape from hitting the press-fitting part 17 and the collar part 18.

  In order to use the retaining bushing 20, first, the nut 7 of the suspension bolt 1 is locked in the small hole portion 15. That is, the large hole portion 14 of the darling hole 3 of the instrument body 2 is inserted into the suspension bolt 1 with the nut 7 and the washer 6, the instrument body 2 is moved sideways, and the suspension bolt 1 is moved to the small hole portion 15. The washer 6 and the nut 7 are locked to the peripheral edge of the small hole portion 15 to be temporarily suspended, and the nut 7 is further tightened to permanently fix the instrument body 3 to the edge of the embedding hole 5 of the ceiling plate 4. At this time, the peripheral edge of the washer 6 is locked to the protrusion 16, and sliding movement to the large hole portion 14 is prevented, thereby preventing the instrument from falling.

  Next, the press-fit portion 17 of the retaining bushing 20 is press-fitted into the large hole portion 14 to close the large hole portion 14, and the collar portion 18 is locked to the periphery of the large hole portion 14. Accordingly, even when the nut 7 is not sufficiently tightened or when the nut 7 or the washer 6 gets over the movement preventing projection 16 due to an earthquake, vibration or the like, the large hole 14 of the nut 7, the washer 6 and the suspension bolt 1 is obtained. Can be prevented from moving to and from falling instruments. In this case, the cutout portion 21 faces the washer 6 and the collar portion 18 does not overlap the washer 6, so that the retaining bushing 20 is not likely to be removed by the washer 6. That is, when there is no notch portion 21 as shown in FIG. 1C, the retaining bushing 20 is attached to the large hole portion 14 after the suspension bolt 1 has moved to the small hole portion 15, so that the collar portion 18 is attached to the washer 6. Since the washer 6 enters the gap between the instrument body 2 and the collar part 18 when the washer 6 moves away from the instrument body 2 due to an earthquake or vibration, the collar part 18 may be pushed up to remove the retaining bushing 20 from the instrument body 2. is there.

  A second embodiment of the present invention will be described with reference to FIGS. Differences from the first embodiment will be described. That is, the projections 23 projecting outward from both ends of the flange portion 18 facing the notch portion 21 are provided, and when the press-fit portion 17 press-fitted into the large hole portion 14 tries to rotate, it hits the projection portion 16 and the press-fit portion 17 Prevent rotation. Thereby, it is possible to prevent the retaining bushing 20 from rotating and coming off from the large hole portion 14.

  The notch 21 is inclined not downward to the instrument body 2 but in a state where the press-fitting part 17 is attached to the large hole part 14, so that the washer 6 hits the notch 21. In this case, the press-fitting part 17 is pushed up in the direction in which the press-fitting part 17 is pushed in, as opposed to the direction in which the press-fitting part 17 is removed from the large hole part 14. Accordingly, in the unlikely event that the washer 6 gets over the protrusion 16, the retaining bushing 20 can be prevented from coming off by the washer 6 hitting the retaining bushing 20.

  Further, a holding part 25 extending in a direction connecting the center of the notch part 21 and the central axis of the press-fitting part 17 is provided in the concave part 19 on the flange part 18 side of the press-fitting part 17. Thus, the notch 21 is reinforced when the washer 6 gets over the protrusion 16 and hits the notch 21 of the retaining bushing 20, and the grip 25 is attached when the retaining bushing 20 is attached to the instrument body 2. It is easy to pinch and the press-fit portion 17 is easy to press-fit into the large hole portion 14.

  Further, the collar portion 18 forms a groove 28 along the center of the lower surface, and forms a plurality of notches 26 that are divided in the circumferential direction of the collar portion 18.

  In the present invention, not only the suspension bolt 1 but also a bolt including another screw is inserted into the large hole portion 14, and the bolt head and the washer 6 attached to the head are locked to the small hole portion 15. On the other hand, the retaining bushing 20 may be applied. Further, a circumferential groove in which the hole edge of the large hole portion 14 is fitted may be formed on the outer periphery of the press-fit portion 17. The notch portion 21 is formed in the press-fit portion 17 and the collar portion 18, but may be formed only in the collar portion 18.

(A) is a bottom view of the mounting state of the retaining bushing according to the first embodiment of the present invention, (b) is a cross-sectional view taken along the line AA, and (c) is a mounting state of the retaining bushing without a notch. FIG. It is a disassembled perspective view before attachment of a lighting fixture. It is a perspective view before attachment of the retaining bushing of 2nd Embodiment. It is a bottom view of the attachment state of a retaining bushing. (A) is a bottom view of the retaining bushing of the retaining bushing, (b) is a sectional view taken along line BB, and (c) is a sectional view taken along line CC. It is a top view of the state which attached the retaining bushing of the prior art example to the daruma hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension bolt 2 Instrument body 3 Daruma hole 6 Washer 7 Nut 14 Large hole part 15 Small hole part 16 Protrusion part 17 Press-fit part 18 Collar part 19 Recess 20 Stopping bushing 21 Notch part 23 Protrusion 25 Grasping part

Claims (5)

A nut and a washer-attached nut mounted on the suspension member, mounted in the large hole portion of the spar hole consisting of a large hole portion provided in a suspended body suspended by a suspension member and a small hole portion continuous thereto. The bolt moves from the small hole portion to the large hole portion when the periphery of the small hole portion is placed on a bolt having a bolt head or a head with a washer and the suspended body is in a locked state. A retaining bushing that prevents
An elastic press-fit portion that press- fits into the large hole portion from the hole axial direction and closes the large hole portion, and the large press-fit portion formed at the rear end of the press-fit portion is press-fitted into the large hole portion. A collar portion to be engaged with the periphery of the hole portion;
The nut or the washer-attached nut formed on both the collar part or the press-fitting part and the collar part and facing the small hole part in a state where the press-fitting part is press-fitted into the large hole part. A retaining bushing comprising a notch portion for escaping the bolt head or the head with washer.   At the edge of the saddle hole, there is a washer movement preventing projection at the boundary between the small hole and the large hole, and the collar has a projection that hits the projection and prevents the press fitting from rotating. The retaining bushing according to claim 1.   3. The extraction according to claim 1, wherein the notch has a slope that presses the collar against the periphery of the large hole when the nut, the bolt head, or the washer hits the notch. Stop bushing.   2. The retaining bushing according to claim 1, wherein the press-fit portion has a recessed portion that opens on an end surface on the collar portion side, and a gripping portion that protrudes in a direction away from the notched portion from the notched portion protrudes in the recessed portion.   The lighting fixture which has a saddle hole equipped with the retaining bushing of any one of Claims 1-4.

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