US1331763A

US1331763A - Dry cell

Info

Publication number: US1331763A
Authority: US
Publication date: 1920-02-24
Anticipated expiration: 1937-02-24

Description

C. W. HAZELETT.

DBY CELL. APPLICATION FILED MAY 9, 1919.

1,33 1,763. Patented Feb. 24,1920.

INVENTOR 1:. .HAZELE T BY ma/g W .4 TYfORNE r v UNITED STATES PATENT OFFICE.

CLARENCE W. HAZELETT, 0F LAKEWOOD, OHIO, ASSIGNOR TO NATIONAL CARBON COMPANY, INC., A CORPORATION OF NEW YORK.

DRY CELL.

Specification of Letters Patent.

Patented Feb. 24, 1920.

To all whom it may concern:

Be it known that I, CLARENCE W. HAZE- LETT, a citizen of the United States residing at Lakewood, in the county of luyahoga and State of Ohio, have invented a certain new and useful Improvement in Dry Cells, of which the following is a full, clear, and exact description.

This invention relates to electric batteries having zinc electrodes and one object is to permit the use of spot welding means for attaching the binding post to the zinc. Other obj ects will appear in the appended description in which:

Figure l is a view, with parts in section, of a dry cell zinc having a zinc post spotwelded thereto.

Fig. 2 is a front View of the cell of Fig. 1.

Fig. 1. I

Fig. 4 is a top view of the zinc can of Fig. 1, showing the position where the binding post is attached. I

Fig. 5 is a modified form of zinc binding 0st. p Fig. 6 is a still further modification.

It is the usual practice to make dry cell binding posts of brass and to solder them to the zinc can. This is more or less trouble when the cans are manufactured on a large commercial basis, and it is diflicult to carry 011 the soldering process in such a way that one can be assured that there is a firm union between the post and the zinc can. Furthermore, solder is not a ve strong retaining medium and the hint ing posts frequently become loosened during shipment or while in use. This necessitates the throwing away of the cell, especially when the binding post is loosened in use, as an average customer does not know how to resolder the binding post in position.

As far as I am aware, no one has ever been able to spot-weld a brass binding post onto a zinc can, and this I think is due to the belief that the failure to weld is due to the inherent characteristics of the zinc can itself. I have found that this is not the case, but that the failure to weld is due to the use of two different materials having.

quite widely separated melting points. Consequently the two cannot be caused to ]01I1 by welding.

I overcome the difficultyby forming the binding posts of zinc or some metal or alloy having substantially the same melting point as zinc, zinc preferably being used on account of low cost. I form the binding post in any desired way, preferably in the shape of a plain screw rod 1 having a shoulder 2, such as shown in Fig. 3. The zinc can 3, when this type of post is used, is indented at 4, as shown in Fig. 4:, for a short distance below the top of the can. The zinc post 1 is then placed in the depression or trough 4: with the screw threaded portion extending above the can. The can and the post are then placed in the spot-welding machine and current passed through the post, causing spot-welding, as shown at 5 in Flg. 2. Fig. 3 is a view of the zinc post shown in There is no joining material to be added 7 to the can, as in the soldering process, but the entire operation of indenting the can, feeding the screw post into the depression, and the spot welding of the post to the zinc, can be carried on entirely by automatic apparatus without any difliculty.

My invention of course is not limited to any particular type of post, and in Figs. 5 and 6 I have shown modified forms,.but by way of example only. In Fig. 5 the zinc post 6 is cut away at 7 or otherwise formed with a reduced shank, so that it can be spotwelded to the can without forming the indentation 3 described in connection with the preferred form. In Fig. 6 the zinc post 8 has a slot 9 in the lower portion adapted to receive the top of the zinc can. In 'both of these modifications the post will be spotwelded to the zinc. Various other modified forms of post may be used without departinglfrom the spirit of the invention.

aving described my invention, what I claim is:

1. In dry cells, a zinc container electrode, a zinc binding post thereon, said zinc post being welded to said container.

2. In dry cells, a zinc container electrode having a trough-shaped depression adjacent its top, a zinc binding post in said depression, said binding post being welded to said container.

In testimony whereof, I hereunto affix my signature.

(J. W. HAZELETT.