JP2514287Y2 - Battery lid with exhaust - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery lid provided with an exhaust portion of a storage battery such as a lead storage battery.

[0002]

2. Description of the Related Art Conventionally, a battery lid of a lead storage battery having an exhaust portion is preferably molded by a molding die including an upper die and a lower die. This molding die has a simpler die structure and a lower die cost than the slide type die, and thus the battery lid is preferably manufactured by this die. As shown in FIG. 8 and FIG. 9, the above battery lid has a lid plate A and an exhaust portion B having the following structure, which is produced by the above mold. That is, the exhaust portion B has a pair of cap locking grooves D formed on the cover plate A and facing the inner surfaces of the cap-fitting circular concave wall portion C and the peripheral side wall C1 of the concave wall portion C and extending horizontally. , D, and a cylindrical exhaust hole E on the bottom wall C2 thereof.
Is formed.

In use of the exhaust portion B of the battery lid A, a rubber elastic valve membrane F is elastically fitted to the upper end of the exhaust hole E as shown in FIG. The exhaust cap G is fitted in the concave wall portion C, and the arcuate locking projections H, H provided on the periphery thereof are fitted and locked in the cap locking grooves D, D. The safety valve device is configured to open and exhaust the valve when excess gas is generated inside the lead storage battery.

[0004]

However, since the above-mentioned battery lid is molded by using the molding die including the upper die and the lower die, the locking groove D is formed when the die is released. when demolding upper mold having a protruding portion that, when the protrusion portion is withdrawn from the groove D for locking, positioned at the top side of the locking groove D
Since this engages the upper wall portion G itゝbecome pushed upward direction to the end in the upper edge of the upper wall portion G rose burr upward direction, as shown in FIG. 8 shows, the lid plate A It is molded to the battery lid with a burr portion g of the appearance of a burr projecting upward direction from the flat top surface. Therefore, after that, a processing step of removing the burr portion g by cutting to make the upper surface of the cover plate A flat is required, and thus there is an inconvenience of increasing manufacturing labor and cost.

[0005]

Means for Solving the Problems The present invention removes the above-mentioned conventional drawbacks, can be omitted above cutting process, the production of effort, is provided a reduced battery cover costs, and the upper die
Groove for forming cap locking groove of molding die consisting of lower mold
After closing the upper mold and the lower mold with parts and casting synthetic resin
By removing the mold, the cap fitting concave wall portion and the circumference of the concave wall portion are attached to the lid plate.
Exhaust on the inner wall of the side wall and the bottom wall of the concave wall part
When molding a battery lid having an exhaust portion having a hole, the upper mold
From the groove for locking the cap of the recessed wall formed
When it is struck, the cap locking groove forming projection
Engages with the upper wall portion located above the working groove,
The inner edge of the upper end is pushed outward and generated on the upper end surface of the upper wall.
In a battery lid with an exhaust part that has a burred part,
On the upper mold of the molding die, on the upper wall to be molded
Even to the provided with projections for Ochiiketsu portion molded in a position to shape the end face
Molded as above using the upper wall of the upper wall when demolding
A recessed portion for accommodating the burr portion formed in

[0006]

In the battery lid of the present invention, since the burr portion is housed in the housing recess and does not project above the flat surface of the battery lid plate, the battery lid is cut and removed to form a flat surface. It is possible to omit the conventional processing steps. Therefore, the manufacturing time and cost are also reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a battery lid of the present invention. The battery lid 1 is composed of a casing lid plate whose peripheral edge is bent downward.
According to the present invention, the battery lid is manufactured by a pair of upper and lower molds having a lid plate 1 and an exhaust portion 2 having the following structure.

The exhaust part 2 has a bottomed cylindrical cap-fitting concave wall part 3 which is bent downward and an inner surface of a peripheral side wall 3a of the concave wall part 3, for example, a width of about 1 mm and a depth of about 0.5 mm. The horizontally extending arcuate cap locking groove 4 is disposed so as to face each other, and the exhaust hole 5 that penetrates vertically is provided at the center of the bottom wall 3b. It should be noted that the exhaust hole 5 has a cylindrical shape as shown in the drawing.
It is formed in a cylindrical exhaust hole 5 surrounded by a, and a rubber elastic valve is tightly fitted to the upper end of the cylinder 5a by its elastic force to normally close the exhaust hole 5 and set a predetermined excess gas pressure. When the battery lid is generated in an airtight battery case, it is used in the same manner as the conventional battery lid to allow the exhaust of the battery lid.

According to the present invention, as clearly shown in FIG.
The exhaust part 2 is formed as follows by the upper and lower molds as will be described later. Ie upon upper wall 1a located above the side of the locking groove 4 provided in the concave wall portion 3 of the exhaust portion 2 on the upper surface of the lid plate 1, the required on its upper surface the depth It is characterized in that a recessed portion 7 accommodating the burr height of the burr-like burr 6 generated by the edge of the outer wall 1a curving up when the mold is released is formed by the molding die. And More specifically, the recessed portion 7 is formed as a notched recessed surface having an L-shaped cross section and extending in an arc shape with an appropriate width along the circumferential edge of the recessed wall portion 3. The depth of the recessed portion 7 is formed by measuring the curling height of the curling portion 6 which is generated in advance by a large number of tests and taking this into consideration. In the illustrated example, the recess 7 has a depth of 0.2 mm and a width in the light direction of 0.7 mm.

FIG. 1 shows an upper mold 9 and a lower mold 10 for molding the battery lid of the present invention in a state of being demolded corresponding to the battery lid of the present invention, for easy understanding. There is. The upper mold 9 and the lower mold 10 respectively have a cylindrical male mold part for molding the exhaust part 2 and a female mold part for fitting the cylindrical mold part on the cover plate 1 so as to face each other. The upper die 9 has an arcuate projection 7'for forming the above-mentioned arcuate recesses 7, 7 at the intersection of the cylindrical male die portion protruding from the base surface and the base surface. 7 '
There is no difference from the conventional one except that the point is provided. In the drawing, 4'is a projection for forming the cap locking groove 4. Thus, when the upper mold 9 and the lower mold 10 are closed, the synthetic resin is cast, and then the upper mold 9 and the lower mold 10 are opened, the locking groove 4 of the recessed wall portion 3 formed. projections for the cap locking groove forming the upper mold 9 to be pulled out of 4 'engages the upper wall portion 1a located outside the locking groove 4, pushes up the upper inner edge outward , will be allowed to flex, the upper wall 1
so that the produce burrs portion 6 on surface of a but upper mold 9
Advance by providing the protrusions 7 ', since該陥cut-out portion 7 in advance in the upper surface a predetermined depth of the upper wall 1a is molded into,
The burr 6 is housed in the recess 7 and does not project outward from the flat upper surface of the lid plate 1. as a result,
Since the molded battery lid does not need to be cut off the burr portion 6 after the molding is completed, the battery lid molded on the upper surface of the lid plate is required after the battery lid molded by the conventional mold. The process of making the flat surface by cutting off the protruding burr portion can be omitted, and the battery lid which is easy to manufacture and inexpensive can be obtained.

The exhaust part 2 of the battery lid of the present invention is provided on the cover plate for the battery case, which is composed of a single cell chamber.
It goes without saying that the lid plate for the battery case, which includes a plurality of cell chambers, can be provided with a plurality of exhaust portions 2 in a number corresponding to the lid plate.
3 to 5 show an embodiment in which the present invention is applied to a battery lid applied to a battery case consisting of a three-cell chamber of a small sealed lead-acid battery. The lid plate 1 has three exhaust parts 2 provided therein. It is a long rectangular box-shaped battery lid. In the drawing, the basic structure of each exhaust unit 2 is the same as that of the above-mentioned embodiment. The basic configuration has a more detailed configuration in the following points. That is, a plurality of exhaust notches 5b are provided at the upper end of the tubular wall 5a of the tubular exhaust hole 5, and the cap-shaped exhaust shown in FIG. A pair of vertical ribs 3c for locking to be fitted and inserted in a fitting hole 12a provided at the lower end of the cap 12 is provided.

When using each of the exhaust portions 2 of the conventional battery lid, as shown in FIG. 7, an elastic valve membrane 13 made of rubber or the like is tightly fitted on the upper end of the cylindrical wall of the cylindrical exhaust hole 5 as shown in FIG. In the cylindrical concave wall portion 3, that is, in the concave portion space 8, a cap-shaped exhaust cap 12 shown in FIG. 6 is provided, and a horizontally extending arcuate shape projecting on the outer peripheral surface at the opposite position. Locking protrusion 1
2b and 12b are provided on the inner peripheral surface of the concave wall portion 3 for locking 4,
4 was fitted and locked by its own flexibility. Reference numeral 12c indicates an exhaust hole provided in the upper portion of the exhaust cap 12.

In the above embodiment, the exhaust cap locking groove 4 is provided in a part of the inner peripheral surface of the recess of the exhaust portion 2.
There is no problem even if it is an annular locking groove over the entire circumference, therefore,
In this case, a ring-shaped locking projection may be formed on the outer circumference of the cylindrical wall of the cap-shaped exhaust cap. When the exhaust cap 12 is made of a flexible circular plate,
The entire peripheral edge can be made to act as the locking projection 12b.

[0014]

EFFECTS OF THE INVENTION A fitting concave wall portion for fitting an exhaust cap is formed on a cover plate, and a cap locking groove is provided on an inner peripheral surface of a peripheral side wall thereof and an exhaust hole is provided on a bottom wall thereof. a battery cover having a vent comprising, on surfaces of the upper wall portion of the upper side of the cap engaging groove, to accommodate the burr portion of the plate wall portion produced during demolding to a Ochiiketsu portion thereof Ochiiketsu portion Since the recessed portion is formed by the mold, the manufacturing step of cutting off the burr after the molding of the battery lid can be omitted, and the manufacturing time and cost of the battery lid can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of a battery lid provided with an exhaust unit according to an embodiment of the present invention after a mold is removed.

FIG. 2 is a top view of the main part of the battery lid.

FIG. 3 is a top view of a battery lid having an exhaust unit according to another embodiment of the present invention.

4 is a sectional view taken along line IV-IV of the battery lid shown in FIG.

5 is a cross-sectional view taken along line VV of the battery lid shown in FIG.

FIG. 6 is a perspective view of an exhaust cap.

7 is a cross-sectional view showing a usage state of the battery lid shown in FIG.

FIG. 8 is a cross-sectional view of an exhaust portion of a conventional battery lid.

FIG. 9 is a top view of the exhaust portion of the battery lid.

FIG. 10 is a cross-sectional view of a usage state of the exhaust portion of the battery lid.

[Explanation of symbols]

On the lid plate 1a of the first battery lid wall
2 Exhaust part 3 Cap fitting recess 4 Cap locking groove 5
Exhaust hole 6 Blister 7 Indentation

Claims (1)

(57) [Scope of utility model registration request] 1. A molding die cap comprising an upper die and a lower die.
The upper mold and the lower mold having a protrusion for groove forming for locking,
For casting a synthetic resin and then removing the mold to fit the cap to the lid plate
A concave wall portion and a cap locking groove on the inner surface of the peripheral side wall of the concave wall portion;
Battery provided with an exhaust part having an exhaust hole in the bottom wall of the concave wall part
At the time of molding the lid, the cap of the concave wall part formed by molding the upper die.
For locking the cap when it is pulled out from the locking groove
On the upper wall portion where the groove forming projection is located above the locking groove,
Engage and push the inner edge of the upper end of the upper wall upwards
Equipped with an exhaust unit that has a burr generated on the upper end surface of the wall
In the obtained battery lid, molded into the upper mold of the molding die.
Forming a recess at the position for molding the upper end surface of the upper wall to be formed
Molded as above using the one with the projection for
A recess for accommodating the burr formed at the time of demolding on the upper end surface of the wall
A battery lid having an exhaust portion formed by forming a cutout portion .