US1331189A - Drill - Google Patents

Description

J. J. FARRELL.

DRILL.

APPLICATION FILED JUNE 10. 1919.

1,331,189. Patented Feb. 17,1920.

WITNESSES MENTOR Q/ M I WWI J M fi/PPLQA A TTORNEYS UNITED STATES PATENT OFFICE.

JAMES JOSEPH FARRELL, OF ST. LOUIS, MISSOURI.

DRILL.

from storage battery posts.

The particular object of the invention is to provide a drill or tool whereby the connector may be cut from around the post, thereby leaving the post undisturbed. In common practice the post is drilled or bored away in order to get the connector off. By the use of my invention the connector can be taken off without boring or drilling the post away.

A further object of the invention is to provide an improved drill of the class described which will be extremely simple, durable, efiicient in operation and inexpensive to manufacture.

' With these and other objects in view which will become apparent as the description proceeds, the invention resides in the construction, combination and arrangement of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawing in which like characters of refer' ence indicate like parts throughout the several figures of which:

Figure 1 represents a view in elevation of a drill constructed according to my invention.

Fig. 2 represents a similar view partially in section, the section being taken at right angles to Fig. 1.

Fig. 3 represents a view in perspective of thelportion of the drill forming the counter sln i.

Fig. 4: represents the member forming the drill proper, arrangedpartially in section, representing the manner of operation.

The invention contemplates the use of a tool comprising in general a counter sink which initiates a-circular groove in thecon nector around the post of the battery, and a drill which finishes the circular cut and thereby disconnects the connector from the post in order to allow the connector to be removed.

The arrangement is such that the slots provided in the drill proper serve the double Specification of Letters Patent.

Application filed June 10, 1919. Serial No. 303,044.

purpose of allowing egress of the material as it is cut, and of serving as a drive means for the lugs carried by the shank of the counter sink.

Referring more particularly to the drawing, the drill pro-per is indicated generally at A, and the counter sink at B. The drill includes a shank 1 reduced at its upper end, adapted to fit any suitable brace or other driving device, and a bit or tool which is carried by the shank. This bit is in the form of a hollow cylinder provided at diametrically opposed points with slots 3 extending upward from the lower edge of the bit. At its lower edge the bit is provided with two diametrically opposed cutting teeth 4, formed by oppositely inclining the lower semicircular edges of the bit. It will be noted that each of the teeth 4 occurs at the lower end of one of the slots 3. lVhen the bit is in operation the metal or material cut by the teeth 4:, may find egress from the out or groove being made by passing out through the slot 3.

,.These slots are slightly curved, and are adapted to receive the opposite lugs 5 formed on the shank 6 of the counter shank. The shank is adapted to fit into the hollow cylindrical bit, and when in place the upper end of the shank abuts against the internal shoulder 7 at the base of the bit, thus limiting the movement of the shank into the bit at such a point that the teeth of the bit will be spaced from the head 8 of the counter sink. There will therefore be no danger of damaging the teeth of the bit.

The. head 8 is provided with a circular series of cutting teeth 9, and carries a cylindrical spring-pressed punch 10 which pro jeets below the teeth 9. The punch is connected to the lower end of a spring 11, arranged in a central bore in the counter-sink. The spring normally holds the punch slightly beyond the cutting edges of the teeth 9, as indicated in Fig. 2.

drill is placed upon the post of the battery I with the central punch resting on the central point of the post.

I By then rotating the drill the teeth 9 of the counter sink Will cut a circular groove or channel in the connector around the post. This groove or counter sink having been formed, the drill may be lifted, the counter sink B allowed to drop out of the cylindrical bit, and the bit may then be fitted into the counter sink and the drilling process completed. During the operation of the counter sink in cutting a circular groove or channel in the connectors the spring 11 keeps the central punch pressed on to the work.

In this way I am enabled toremove the connector from the post without damaging the latter. The operation is a simple and speedy one, and it takes a comparatively short time to complete when compared With the old process of boringand drilling the post away. Furthermore, it saves the dam- 1 age incident to the drilling away of the post itself in order to get the connector ofi'.

Although I have described the preferred embodiment of my invention, I may desire to make such changesin the construction,

combination and arrangement of parts thereof, as do not depart from the spirit of the invention and the scope of the appended claims. I

bit as to tend to retain the lugs in the slots.

2. In a drill of the class described, the combination of a hollow cylindrical bit pro vided with longitudinally extending slots, a counter sink having a shank slidable into 7 the cylindrical bit and provided with lugs engageable into said s1ots. Y

3. In a drill of the class described, the combination of a hollow bit having an internal shoulder at its inner end and having teeth at its outer end, a counter sink having a shank slidable into the hollow bit and adapted to rest against said shoulder and thereby limit the movement of the shank into the bit at such a point as to space the teeth of the bit fromthe head of the counter sink, substantially as described.

JAMES JOSEPH FARRELL. Witnesses:

FRED J .-MILLER, THOMAS I. GLANNON.

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