US1499561A - Drill - Google Patents

Description

Juk 1 1924.

P. STEFANICH DRILL Filed Nov. 16, 1922 2 Sheets-Sheet 2 Will!!! Q 111L111 /////Ax rn'r s'rnrcn, or INDIANA e v jlltlt IANA, essrcn'on. or one-new 'ro t STEFANICH, or rnnrann i 1:.

To all whom it may concern:

Be it blown that l, PETER STEFANICH, a citizen of Austria, residin at Indiana Harbor, in the county of La e and State of llndiana, have invented certain new and useful Improvements in Drills; and l do declare the followin to be a full, clear, and exact description oi the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

T is invention relates to a drill, the general obj ect of the invention being to provide means for boring a square hole by means of a central bit and four side cutters which cut the corners from the walls of the hole made by the bit.

Another object of the invention is to provide means for permitting the part which carries the cutters to have vertical or longitudinal movement. 4

The invention also consists in certain other features of construction and in the combination and arrangement. of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

"lln describing my invention in detail, reference will be had to the accompanymg drawings wherein like characters denote like or corresponding parts throughout the several views, and in which V Figure 1 is an elevation of the invention.

Figure 2 is an elevation, with parts in section, of the drill carrying member.

Figure-3 is a section on line 33 of Figure 1.

Figure t is a view'of the drill bit.

Figure 5 is a view of one of the guide bar supporting clamps.

Figures 6 and 7 are views showing one of the saw-carrying shafts in side elevation.

Fi ure 8 is a view showing the saw-carryin s aft in end elevation.

11 these views, 1 indicates the drill press having a chuck to which the shank of the bit 2 is connected so that the bit can be rotated in the ordinary manner and made to travel towards and away from the work. A sectionalucollar 3 is secured tosaid press and carries s uare sockets 4 for the guide rods 6,'the rods being secured in the sockets by set screws 7. The shank of the bit passes Application filed November it, 1922. serial no. 601,40fi.

through a cylindrical body 8, the bit and shank being rotatably connected with the body, preferably by a ball bearing 9 placed between'the lower end of the body and the head of the bit and another ball bearing 10 placed between the upper end of the body and the washer 11, the washer being held in place by the nut 12 which engages a screw threaded part of the shank and is secured by the lock nut 13. The washer may be held rotatably in relation to the shank by the flat part 14, the washer having a similar flat portion. The body 8 has secured thereon the sectional collar 15 which carries the sockets 16 for slidably receiving the rods 6, so that the body is guided in its vertical movement by said rods and is held against rotary movement. The,

bore of the body. has an enlarged part at its lower end to receive an enlarged part of the shank, this part of the shank having a bevel gear 17 formed thereon. Smallshafts 18 are mounted in the lower part of the 'body, the inner ends of these shafts carrying the bevel gears 19 which mesh with the gear 17 so that the shafts are revolved when the drill and its shank are rotated. The outer ends of the shafts have secured thereto the circular cutters 20, which are made somewhat similar to a saw, these outters being so arranged that they will cut the corners from the wall of the hole made by the bit so that the device will make a square hole. The upper part of the body is formed with the oil holes 21 so that the 5 movable parts may be provided with lubricant.

From the foregoing it will be seen that when the bit is rotated from the press and tltt advanced into the Work, the cutters will llltl make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fa]! Within the scope of the appended claims.

I claim: A

1. In combination with a .drill, a chuck for drivin the drill, and a stationary member towar and from which said chuck-is a movable; an elongated casing through Which said drill passes, means connecting c the drill and casing for axial movement as having diametrically opposed external sockets, a pair of parallel guide rods at the exterior of said casing and chuck rigidly held at one end in said sockets, a second collar clamped around said casing, and diametrically opposed external sockets carried by said second collar and slidably surrounding said guide rods.

2. A structure. as specified in claim 1; each of said collars comprising a main semi-circular section whose ends carry the sockets, an auxiliary selm circular section, and fasteners connecting the ends of said sections.

In testimony whereof I have hereunto affixed mysignature.

PETER STEFANICH.

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