JPS6334007B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of manufacturing a cover for a box used in an alarm device.

[Background technology]

Conventionally, when attaching a cover to a case used for various alarm devices, the cover is screwed to the case, which takes time and effort, and the screws gradually loosen, causing the cover to wobble. It had the disadvantage of being easy to use. In addition, gate marks, which are the marks of the gate part of the mold, are formed on synthetic resin covers during molding, but the gate marks are considered unnecessary and are not used at all.In fact, gate marks are treated as unnecessary items. It needed to be cut.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a plurality of locking recesses on the front side of the case, and at positions facing each locking recess on the inner surface of the cover. By protruding a plurality of locking protrusions, the cover can be easily attached to the front side of the case by simply inserting each locking protrusion into the opposing locking recess, making it possible to easily attach the cover to the case. The positioning of the cover is easy, and no screws are required for installation.Moreover, the cover does not rattle or fall off from the case.Furthermore, the multiple gate marks left during cover molding are replaced by locking protrusions. To provide a method for manufacturing a cover for a box, which simplifies the structure of a mold for forming the cover by using the cover as a piece, and eliminates the need to cut the gate mark after molding.

[Disclosure of the invention]

That is, in the present invention, synthetic resin is injected into the cavity 17 formed in the mold 14 through a plurality of gates 16 and cured, so that a plurality of gate marks protrude to the back side of the cover 5 and form the equipment housing part 1. A case characterized in that it is released from a cavity 17 while remaining as locking protrusions 4 that are respectively fitted into a plurality of locking recesses 3 formed on the front side of the case 2. The above object has been achieved by the method of manufacturing the cover.

The present invention will be explained in detail below by means of illustrated embodiments. A box 2 made of synthetic resin or metal has an open front and is divided into three device storage compartments 1 by a roughly T-shaped partition piece 6.
A switch 7 and a terminal 8 can be attached to the upper device storage section 1a, and a display panel block 9 such as an intercom block and an operation panel block 10 can be attached to the left and right device storage sections 1b and 1c, respectively. It's becoming like that. A flange 11 is protruded from the outer peripheral surface of the box 2, and a stepped portion 12 is formed on the outer periphery of the box 2 and the front side of the flange 11. A locking recess 3 is cut out approximately at the center of the edge and at the center of the partition piece 6, respectively. A synthetic resin cover 5 with an open back is formed to have approximately the same size as the box 2, and has a rectangular opening 13 formed in the front so as to face the equipment storage parts 1b and 1c. Furthermore, when the cover 5 is attached to the case 2, there are a plurality of locking protrusions, which are the marks of a plurality of gates, on the inner edge of the opening 13, which is located on the inner surface of the cover 5, facing each of the locking recesses 3. Each piece 4 is provided in a protruding manner. That is, when the cover 5 is injection molded from a synthetic resin such as vinyl chloride resin, the synthetic resin passes through the sprue and runner 15 of the mold 14 as shown in FIG. 5 and enters the space for molding the cover 5 through the gate 16. It flows into the cavity 17, but when the cover 5 is removed from the cavity 17, a gate mark remains on the cover 5, which is the mark of the gate 16 part of the mold.
A cover 5 is formed as a locking protrusion 4 to face each locking recess 3 of the case 2. Therefore, the display panel block 9 is installed in the equipment storage sections 1b and 1c.
After the operation panel block 10 is attached, each of the locking protrusions 4 is fitted into the opposing locking recess 3, and the inner edge of the back side of the cover 5 is fitted into the stepped portion 12 to cover the case 2. 5, and insert the display panel block 9 and operation panel block 10 from the opening 13.
is exposed to form an alarm device. As mentioned above, the plurality of locking recesses 3 provided on the front side of the box 2
, the cover 5 is placed so as to face each of the locking recesses 3.
By inserting the locking protrusion 4 provided on the inner surface of the cover 5
Since the cover 5 can be attached to the case 2, it is easy to align the cover 5 and the case 2, and furthermore, there is no need for screws or the like to remove the cover 5, so the cover 5 can be easily attached to the case 2. can. Further, the cover 5 is constructed by fitting a plurality of locking protrusions 4 into opposing locking recesses 3 to cover the case 2.
Since the cover 5 can be attached to the case 2 firmly, the cover 5 will not wobble in the front, back, left and right directions with respect to the case 2, and the cover 5 will not fall off from the case 2. This means that the gate marks on the cover 5, which were previously unnecessary and had to be cut, can be actively used as means for locking the case 2.

〔Effect of the invention〕

As described above, in the present invention, the mold is released from the cavity with a plurality of gate marks left behind as a plurality of locking protrusions that are fitted into locking recesses formed on the front side of the case. Therefore, the cover can be easily attached to the front side of the case by simply fitting the plurality of locking protrusions into the plurality of locking recesses of the case, and the cover and the case can be easily attached to each other. In addition to being easy to align, screws or the like are not required for attaching the cover, and the cover does not rattle or fall off from the case. In addition, by simply providing multiple gates in this way and processing the mold so that these gate marks become locking protrusions, the multiple gate marks after molding can be used to lock each cover into multiple locking pieces. It can be used as a protruding piece, and there is no need to provide any other special locking protrusions on the cover, which simplifies the structure of the cover mold.Also, the multiple gate marks can be removed from the back side of the cover. Since it protrudes, when using a molded cover, it is not exposed to the outside and has a good appearance, and there is no need to cut the gate marks on the cover after molding, so the cover can be manufactured at a low cost. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure is a partially broken side view of the same as above, Figure 3 is a perspective view of the cover attached to the case, Figure 4 is a sectional view of the cover, and Figure 5 is a sectional view of the mold for molding the cover. 1 is an equipment storage part, 2 is a box, 3 is a locking recess, 4 is a locking protrusion, 5 is a cover, 14 is a mold, 1
6 is a gate, and 17 is a cavity.

Claims (1)

[Claims] 1 Synthetic resin is injected into the cavity formed in the mold through multiple gates and cured, so that multiple gate marks protrude on the back side of the cover and are recessed on the front side of the box that has the equipment storage area. A method for producing a cover for a box, characterized in that the mold is released from a cavity while retaining protrusions that are respectively fitted into a plurality of provided retaining recesses are left behind.