JPS597799A - Electric fan guard and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to reduce the process steps and work hours of manufacturing electric fan guards, by carrying out a scrapless working process of complementary stock layout for reducing the cost of materials, and integrally incorporating guard rods with a small ring. CONSTITUTION:The intermittent operation of a punch is carried out to a rolled metal material for a complementary stock layout by which two comb parts 20 of left and right are simultaneously fabricated, and the band side 21 of the thus obtained comb part 23 is curved into a circular shape so that a small ring 24 is formed and the teeth 22 of the comb part are expanded radially for obtaining guard rods 25. The guard rods 25 are bent into a substantially L-like shape, and then the free ends thereof are fixed to a large ring (not shown). Thereby, the manufacturing process is simplified and rationalized in comparison with the conventional process in which the guard rods 25 and the small ring are separately formed and then assembled, and as well the productivity and uniformity of the manufactured parts may be enhanced. Further, the cost of material is aimed at being reduced due to that the yield of materials is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a guard for an electric fan and a manufacturing method thereof, and particularly aims to provide a low-cost product and a low-cost manufacturing method through effective use of materials and rationalization of processes. do.

A conventional electric fan guard will be described below with reference to the drawings.

A first conventional example will be explained with reference to FIGS. 1, 2, and 3. 1 is a small ring, 2 is a large ring, 3 is a number of vibrators fixed in a radial manner by welding both ends to small ring 1 and large ring 2, fitting 3, -2. It is a guard stick. (The figure shows a welded type) The two half-guards are made by fixing several guard rods 3 radially to the small ring 1 and large ring 2, and the large ring 2 is joined to form the main guard, and the motor It is fixed around the bearing 6 of No. 4.

Note that the electric fan in FIG. 1 is omitted.

Dimension 6 is a mark stand where you can pick up a mark that usually has a registered trademark representing the manufacturer.

By the way, the above conventional structure has a small ring 1. Big ring 2
: Since the guard rods 3 are manufactured separately and assembled, many steps are required for manufacturing, and the products tend to be non-uniform due to assembly. A conventional example that improves this point of having a large number of parts is shown below. A second conventional example will be explained with reference to FIG. In this example, the guard protects the fan, so the material is formed into an arm shape that encloses and protects a space that is a little larger than the fan space.
It is punched out using a press to form a space 7 through which the airflow passes, and the remaining portion is used as a guard rod 8, but it is desirable to make the space 7 through which the airflow passes as large as possible in consideration of air resistance. . [7] However, if the space 7 is made larger, the amount of scrap increases accordingly and the profit yield deteriorates, and the guard rod portion 8 cannot be made too thin considering the strength of the remaining guard rod 8. From the standpoint of safety, it is better to have more guard rods 8 in the space 7 to prevent fingers from getting into it, and to make it smaller, but in this case, air resistance increases, resulting in negative effects such as a decrease in wind speed and an increase in noise. The second conventional example has this drawback.

In view of this, the present invention is intended to provide a product that simplifies and streamlines the manufacturing process, significantly reduces material costs, and has uniform quality, and a manufacturing method that can obtain it. It is.

An embodiment of the present invention will be described below with reference to FIGS. 6 to 1.

Reference numeral 9 is a material, and this material 9 is first drilled with pilot holes taa and 9h for shear cutting and splicing in the subsequent process. This drilling is performed intermittently once every two strokes of the press. Dimensioned pilot hole 9a, 9bid-.

Six pens are drilled at the same time in a staggered manner at positions shifted by one pitch on the left and right with respect to the peno feeding direction. Next, the material is sheared at a shear line of 1°
7ru. At this time, the shear line 1o cuts and connects the prepared holes 11a and 11b, but the sheared comb teeth 12a are not cut off and are connected to the band edge 13a.

Similarly, the comb tooth 12b that was sheared one pitch ago also has a band edge 13.
connected to b. This shearing is performed once per press stroke, and the band side 13a.

Make comb teeth 12a and 12b alternately on 13b.

14a, 14bid, in the next bending process the band side 13a,
This is the comb tooth after the first bending process, which is bent by -6 compared to 13b.

When the second bending process is further performed, the comb teeth 16a and 15b form a predetermined angle α0 with respect to the band sides, and the bending process is completed.

Reference numerals 16a and 16b are rubber-shaped parts that have been bent, and have a substantially oval shape facing each other, comb teeth 17a,
17b (! Looking at the relationship between the blanks 18a and 18b, there is no scrap because the material is simply separated by shearing, and the width of the facing comb teeth 20a and 20b and the blanks 21a and 21b is 6 bases. T is also approximately equal to the material plate thickness T'. The comb-shaped portion 1ea formed in the above manner
, 1ab are finally cut along lines 19a and 19b. This cutting is also performed intermittently, and the comb shape 16a is cut every N strokes of the press.

Cut off 16b. In FIG. 7, the total length t of the com part 2o
is determined by the pitch T and the number of strokes N, fi7=NT, and by selecting N and T, the required length l can be obtained.

By changing the material width A, the width m of the com part 20 can be changed.
can also be determined arbitrarily.

By bending the band side portion 21 of the comb component 2o thus obtained into a circular shape and simultaneously expanding the comb teeth 22 radially, the shaped portion 23 shown in FIG. 8 is obtained.

Both ends of the band side 21 are joined to form a small ring 24, and a comb tooth 9 is formed.
The obtained guard rod 26 is further bent.

When processed, a half-guard shaped portion 26 shown in FIG. 9 is obtained.

In FIG. 10, if the large ring 27 is joined to the half guard 26 by welding or the like and the mark stand 28 is attached, it becomes a guard for the electric fan.

As described above, according to this embodiment, the comb parts 2 are processed by scrapless processing by shearing the metal rolls 7
The strip side 21 of the comb part 20 obtained by performing co-cutting to simultaneously form 0 on the left and right sides using the intermittent action of a punch is bent into a circular shape to form a small ring 24, and the comb teeth 22 are expanded radially to form a guard. A large ring 27 is formed by bending the plurality of guard rods 26 into an oval shape and attaching the tip of the small guard 1 to a large ring 27.
Because it is manufactured to be fixed to the small ring 1
In addition to the conventional method shown in FIG. 3, in which the guard rod 3 and the guard rod 3 are manufactured and assembled separately, the manufacturing process is simplified and streamlined, and productivity is significantly improved. Moreover, the uniformity of the product is also higher than that of the conventional method, and it is possible to obtain the effect of significantly reducing material costs due to improved yield.

Note that in this embodiment, the pilot hole may have any other shape as long as it can be cut and spliced.

The angle α0d between the twisted band sides 19a, 19b and the comb teeth 17a, 17b is arbitrary.

As described above, the present invention can significantly reduce material costs by performing scrapless co-cutting processing, and by integrating and producing the Ushida guard rod and small ring, the process and man-hours can be significantly reduced. can be measured, and its practical effects are significant.

[Brief explanation of the drawing]

Fig. 1 is a side view of the electric fan, Fig. 2 is a perspective view of a conventional electric fan guard, Fig. 3 is an exploded sectional view of a conventional electric fan guard, and Fig. 4 is a perspective view of a conventional press-formed guard. ,
FIG. 6 is a perspective view of a material to explain the process of processing the material by press working in one embodiment of the present invention [8]. FIG. A perspective view of the material, FIG. 7 is a perspective view of the comb-shaped part,
Fig. 8 is a perspective view of the developed part of the com part, Fig. 9 is a perspective view of the half-guard part after guard rod molding, and Fig. 10 is an exploded cross-sectional view of a fan guard according to an embodiment of the present invention. It is. 1o...Shear line, 11a, 11b...Prepared hole, 12 &, 12 b=..., comb teeth, 13 a,
13 b, -,,, obi side, 1e a, 16 b・
=・:r M shape part, 17a. 9 pages 17b...comb teeth, 19a, 19b...
Shear wire, 20... Comb parts, 21...
- Obi side, 22...Comb teeth, 24...Small ring, 25...Guard rod, 27...Large ring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 %+9

Claims (2)

[Claims] (1) A plurality of prismatic pillars are formed radially around one point, each with a gap between them so that the hands of the person working in the trench do not touch the blades directly so that the wind from the fan blades can flow smoothly. A guard rod formed in a circular shape and provided on the circumference by connecting one end of the guard rod in advance, and a large band formed in a circular shape and connecting the other end of the guard rod. A fan guard consisting of a ring. (2) A long material has a predetermined distance from both end faces on the left and right sides in the longitudinal direction of the material, and is arranged in a staggered manner at a constant pitch in the longitudinal direction, and has a width in the longitudinal direction of a step of providing pilot holes equal to or larger than the pitch; and a first cutting in which the material is cut at a pitch equal to the pitch and along a line connecting the pilot holes on one side and the pilot holes on the other side. The material is punched by a punch at a line connecting two pilot holes on the other side and the next pilot hole near the one side in the longitudinal direction with a pitch equal to the pitch. a second cutting step of cutting; a step of sequentially repeating the first cutting step and the second cutting step to form comb teeth at the time of cutting, and at the same time forming a band side connecting one side of the comb teeth; , the step of dividing the material into two, forming the band side in a circular shape and forming comb teeth radially; forming the comb teeth into a predetermined shape to form a guard rod; and forming the other end of the guard rod into two. A method of manufacturing a guard for an electric fan, which includes the steps of connecting each part with a large ring.