JP2000118878A - Electric wire winding drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up assembling work of flange parts to a body part with a bolt and to obtain a strong flange part structure against a fastening strength of the bolt. SOLUTION: This electric wire winding drum 1 comprises a pair of flange parts 4 at the both ends of a hollow body part. A long bolt is inserted into the body part through a bolt insertion hole 7 formed in one of the flange parts 4, while a front end of the bolt is inserted through a bolt insertion hole 8 formed in the other flange part 4 so that the body part is integrally connected with the flange parts 4. Plural guide ribs 10 surrounding the bolt insertion hole 8 are projectingly provided on an inner side face of the other flange part 4. A front end face of each the guide rib 10 is inclined to the insertion direction E of the bolt as it goes from an outer circumferential face to an inner circumferential part 10b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire winding drum, and more particularly, to a technique for connecting a body portion and a collar portion with bolts.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a pair of flanges 4 are arranged at both ends of a hollow body 3 to form a long bolt 6.
Is inserted into the body 3 through a bolt insertion hole 7 provided in one of the flanges 4, and the tip 6 a of the bolt 6 is further inserted into the other flange 4.
Is inserted into the bolt insertion hole 8 provided on the other end, and a nut is fastened to the tip 6a of the bolt 6 protruding to the outside of the other flange portion 4 to integrally connect the two flange portions 4 via the body portion 3. An electric wire winding drum 1 'is assembled.

[0003]

However, in the prior art,
When the tip 6a of the bolt 6 is inserted from the inside of the body 3 into the bolt insertion hole 8 of the other flange 4, the tip 6a of the bolt 6 is not visible from the outside by the body 3.
Cannot be properly inserted into the bolt insertion hole 8, and since the distance between the two flange portions 4 is large, the tip 6a of the bolt 6 escapes up, down, left and right, and is difficult to insert into the bolt insertion hole 8. Thus, the assembling work of the electric wire winding drum 1 'was very troublesome. Further, by using the bolt 6 having a large diameter, the bolt 6 can be easily inserted into the bolt insertion hole 8. However, in this case, the nut naturally becomes large, excessive tightening is likely to occur, and the brim portion 4 is damaged. there were.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to speed up the work of assembling a flange portion and a body portion with bolts. It is an object of the present invention to provide an electric wire winding drum which can have a structure which is strong against the tightening strength of bolts.

[0005]

According to the present invention, a pair of flanges 4 are arranged at both ends of a hollow body 3 and a long bolt 6 is provided on one of the flanges 4. The body 3 and the flange 4 are integrally joined by inserting the tip 6a of the bolt 6 into the bolt insertion hole 8 provided in the other flange 4 from the bolt insertion hole 7 formed. A plurality of guide ribs 10 surrounding a bolt insertion hole 8 are protruded from an inner side surface 4a of the other collar portion 4 and a distal end surface of the guide rib 10 is moved from an outer peripheral surface 10a to an inner peripheral portion 10a.
It is characterized in that it is inclined toward the insertion direction E of the bolt 6 as it goes to b. With this configuration, the tip 6a of the bolt 6 is securely inserted into the bolt insertion hole 8 along the guide rib 10. Can be inserted. Therefore, even if the tip 6a of the bolt 6 escapes up, down, left, and right from the bolt insertion hole 8, the bolt insertion hole 8
The bolt 6 can be inserted smoothly into the bolt.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. The electric wire wound drum 1 is made of, for example, PP (polypropylene), as shown in FIG.
A drum body 2 is configured by arranging a pair of flanges 4 at both ends of a hollow body 3 molded to a diameter of about 500φ,
A long bolt 6 is inserted into the body 3 through a bolt insertion hole 7 provided in one of the flanges 4, and a bolt insertion hole 8 in which the tip 6 a of the bolt 6 is provided in the other flange 4 (FIG. 2). And the nut 11 is fastened to the tip 6a of the bolt 6 protruding to the outside of the other brim portion 4, whereby the two brim portions 4 and the body 3 are integrally joined. The body 3 and the pair of flanges 4 are each formed by injection molding or the like. Also, the center hole 5 provided in the flange portion 4 has:
A rod shaft (not shown) of the electric wire winder is inserted, and the drum body 2 is rotated by the rod shaft to wind up the electric wire.

As shown in FIG. 2, the other flange 4 has, as shown in FIG. 2, an insertion recess 12 into which both ends of a large-diameter body 3 having a diameter of 500 mm are inserted and locked, and a small-diameter body (for example, 450 mm). (Not shown) and second insertion recesses 13 into which both ends are inserted and locked, respectively. Further, a bolt insertion hole 8 is provided radially inward C side of the insertion recess 12,
Further, a second bolt insertion hole 9 is provided on the radially inner side C side of the second insertion recess 13. In addition, a bolt insertion hole 7 (one bolt insertion hole is not shown) shown in FIG. 4 is formed in one of the flange portions 4 at positions corresponding to the first and second bolt insertion holes 8 and 9, respectively. ing.

As shown in FIGS. 1 and 3, an outer peripheral rib substantially concentric with the outer peripheral surface of the end of the body 3 is provided on the inner surface 4a of the other flange 4 as shown in FIGS. 14 is formed in the thickness direction of the flange portion 4, and an inner circumferential rib 15 which is concentric with the outer circumferential rib 14 at a distance S from the outer circumferential rib 14 on the radially inward C side of the outer circumferential rib 14. The outer peripheral rib 14 and the inner peripheral rib 15
And an insertion recess 12 into which the end of the body 3 can be inserted, and a plurality of bolts are inserted radially inwardly C from the insertion recess 12 at intervals in the circumferential direction. Hole 8 is drilled.

Around the bolt insertion hole 8, a flange 4
An annular guide rib 10 protrudes from the inner side surface 4a so as to surround the bolt insertion hole 8. The guide ribs 10 are provided for each of the bolt insertion holes 8 as shown in FIG. An annular guide rib 10 'similar to the guide rib 10 is also provided around the second bolt insertion hole 9 (FIG. 5).
Is protruding.

As shown in FIG. 1, the annular guide rib 10 (also the guide rib 10 ') extends radially around the bolt insertion hole 8, and its distal end surface extends inward from the outer peripheral surface 10a. It is inclined toward the insertion direction E of the bolt 6 toward the peripheral portion 10b, and functions to guide the tip 6a of the bolt 6 into the bolt insertion hole 8.

In this example, the four circumferences of the guide rib 10 are the outer circumference rib 14, the inner circumference rib 15, and the left and right side ribs 1.
6 and enclosed. These outer ribs 14 and inner ribs 1
The distal end surfaces of the left and right side ribs 16 are formed higher than the flat outer peripheral end surfaces 10c of the guide ribs 10, and the outer end portions of the left and right side ribs 16 are cut out in an L shape. . The end of the trunk 3 can be inserted into the cutout 17 as shown in FIG. That is, the insertion recess 12 (FIG. 2) into which the end of the body 3 is inserted is formed along the inner surface of the outer peripheral rib 14, and the cutout portion 17 of the side rib 16 is Unit.
In addition, the guide rib 10 and the side rib 16 regulate the insertion depth of the body 3 by the end of the body 3 contacting the inside of the notch 17 of the side rib 16 and the outer peripheral end face 10 c of the guide rib 10. Also serves as a function.

Thus, the bolt 6 is inserted into the body 3 through the bolt insertion hole 7 provided in one of the flanges 4, and the tip 6a of the bolt 6 is inserted into the bolt insertion hole 8 provided in the other of the flanges 4. The nut 3 is fastened to the tip 6a of the bolt 6 protruding from the outer surface of the other flange 4 by inserting the nut 3 so that the body 3 and the flange 4 are integrally joined. An annular guide rib 10 protrudes from the inner surface 4a of the portion 4 so as to surround the bolt insertion hole 8, and the insertion direction E of the bolt 6 increases as the distal end surface of the annular guide rib 10 moves from the outer peripheral surface 10a to the inner peripheral portion 10b. Because it is inclined toward
The tip 6a of the bolt 6 is smoothly introduced into the bolt insertion hole 8 along the guide rib 10. Moreover,
Since the guide ribs 10 extend radially around the bolt insertion hole 8, even if the tip 6 a of the bolt 6 escapes up, down, left, and right from the bolt insertion hole 8, only by pushing the bolt 6 in, the body 3 allows the bolt 6 to move. Even if the insertion hole 8 is not visible from the outside, the bolt 6 can be smoothly inserted into the bolt insertion hole 8, and the speed of the assembly work of the electric wire winding drum 1 can be increased. Further, after the bolt 6 is tightened, the guide rib 10 serves to reinforce the bolt 6 tightening portion of the collar portion 4, so that the thin rib portion 4 made of synthetic resin is tightened by the bolt 6 and the nut 11. The structure becomes strong with respect to the strength, and the durability of the wire winding drum 1 made of synthetic resin is improved. Further, since the guide rib 10 allows the tip 6a of the bolt 6 to be inserted well into the bolt insertion hole 8,
There is no need to use a bolt 6 with a large diameter.
There is no need to increase 1. Therefore, excessive tightening is less likely to occur, and the prevention of damage to the collar portion 4 is more effective.

Moreover, the outer peripheral end 10c of the guide rib 10
Is formed on a flat surface, and a notch 17 is provided on a side rib 16 protruding from both sides of the guide rib 10 so as to be flush with the outer peripheral end portion 10c of the guide rib 10.
There is an advantage that the end of the body 3 can be inserted and locked using the 0 and side ribs 16 and the insertion depth of the end of the body 3 can be regulated.

Further, in the present embodiment, as shown in FIG. 5, the tip of the bolt is inserted into the bolt insertion hole 9 also around the second bolt insertion hole 9 used when a small-diameter body is attached. A guide rib 10 'for guiding is formed. In this example, a pair of projecting portions 18 that are higher than the outer peripheral end face 10c of the guide rib 10 are respectively protruded from both left and right sides of the guide rib 10 ', and are surrounded by the pair of projecting portions 18 and the inner peripheral rib 15. The end of the small-diameter body portion can be inserted into the recessed groove 19. That is, the inner circumferential rib 1
5, an insertion recess 13 into which the end of the small-diameter body is inserted is formed, and the groove 19 is inserted into the insertion recess 13
Is part of.

In the above embodiment, the guide rib 10
Are formed radially with the bolt insertion hole 8 as the center, but the shape of the guide rib 10 is not necessarily limited to a radial shape, and may be, for example, a conical surface shape that spreads around the bolt insertion hole 8 on the outer periphery. When the plurality of guide ribs 10 are formed radially, the degree of closeness between the guide ribs 10 and 10 is such that the leading end of the inserted bolt 6 does not fall between the guide ribs 10 and 10. It suffices if the gaps between them are formed densely.

Although a case has been described in which both the large-diameter trunk 3 and the small-diameter trunk can be attached, it is also possible to adopt a configuration in which only one of the trunks is attached.

[0017]

As described above, according to the first aspect of the present invention, a pair of flanges are arranged at both ends of a hollow body,
Insert a long bolt into the body from the bolt insertion hole provided on one flange, and insert the tip of the bolt into the bolt insertion hole provided on the other flange to integrate the body and collar together. A plurality of guide ribs surrounding the bolt insertion hole projecting from the inner surface of the other collar portion, and the leading end surface of the guide rib is moved from the outer peripheral portion to the inner peripheral portion. Because it is inclined toward the insertion direction,
The tip of the bolt can be reliably inserted into the bolt insertion hole along the guide rib. Therefore, even if the tip of the bolt escapes from the bolt insertion hole up, down, left, or right, the insertion into the bolt insertion hole can be performed smoothly just by pushing the bolt, and the speed of the assembly work of the wire winding drum should be increased. Can be. Also, after the bolt is tightened, the guide ribs serve to reinforce the bolted portion of the collar, so that even with a thin-walled collar, the structure is strong against the tightening strength of the bolts and nuts. The durability of the wound drum can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of the present invention.

FIG. 2 is a partial front view of the other brim portion of the same as viewed from the inside.

3A is a front view for explaining a bolt insertion hole provided with the guide rib, FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A, and FIG. 3C is a cross-sectional view taken along line BB of FIG. It is sectional drawing.

FIG. 4 is a partially cutaway front view of the electric wire winding drum.

FIG. 5 is a cutaway perspective view illustrating a second bolt insertion hole and a guide rib according to the first embodiment.

FIG. 6 is an explanatory view of an assembled state of a conventional electric wire winding drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire winding drum 2 Drum body 3 Body 4 Collar part 4a Inner surface 6 Bolt 6a Tip 7 Bolt insertion hole 8 Bolt insertion hole 10 Guide rib 10a Outer peripheral surface 10b Inner peripheral surface E Bolt insertion direction

Claims (1)

[Claims] A pair of flanges are disposed at both ends of a hollow body, a long bolt is inserted into a body through a bolt insertion hole provided in one of the flanges, and the tip of the bolt is connected to the other flange. An electric wire winding drum which is inserted into a bolt insertion hole provided in a portion and integrally connects a body portion and a flange portion, and a plurality of guide ribs surrounding the bolt insertion hole project from an inner surface of the other flange portion. A wire winding drum characterized in that the guide ribs are inclined such that the distal end surface of the guide rib goes from the outer peripheral portion to the inner peripheral portion in the bolt insertion direction.