US1667976A - Hand drill - Google Patents

Description

May 1, 1928. 1,667,976

0. E. LINDBERG HAND DRILL Filed Nov. 10. 1926 60 i \Q "-6 w a 4 I 13\ o I 1 Carl E, Lz'ndbery 20 the turning actionof the Patented May 1, 1928.

CARL E. LINDBERG, OF SILVERDALE, WASHING-TON.

ICE

HAND DRILL.

Application filed November 10, 1926. Serial No. 147,408.

M invention relates to drills and particular y to the type of small drill which is intended to be held in and operated by the hand.

The object of my invention is to provide a drill, particularly of this type, with means whereby it is provided with a store of inertia suflicient, to enable it to overcome, without serious difficulty, relatively small obstructions to itsturning, such for instance as occur when a drill works through a thin sheet of metal.

My invention consists essentially in pro viding and mounting upon the drill afly wheel geared to the turning parts of the drill, so as to have a relatively high rate of rotatiomwhereby whenever the drill strikes anything which tends to stop it, the inertia of the rapidly revolving fly wheel will assist hand to cause the bit to continue turning, thereby producing a more uniform and smooth action.

The particular parts and combinations of parts which I believe to be new, and upon which I desire a patent, will be hereinafter particularly set forth in the claims.

In the accompanying drawings I have shown a construction in which my invention has been incorporated, the same being applied to a small hand drill.

Figure 1 shows such a drill having my invention incorporated therein, with the major part of its mechanisms in section.

Figure 2 is a face view of the same drill.

In the drawings, 1 represents a frame which may be of any suitable construction, which provides the proper bearing and suport for the various parts of the drill. This rame is provided with a handle 10 of ordinary construction, by which it may be held. It is also provided with a bit-carrying shaft 11 journaled therein, and provided with any suitable means for holding the drill.

Secured upon and to turn with the bitcarrying shaft 11 are two gears 2 and 3. The gear 2 is a small gear and the gear 3 a much larger gear. These are bevel gears and mesh, respectively, with the gears and 30, which are, respectively, large and small gears, each meshing with its complemental gearas 2 and 3, that is, the small gear of each set meshes with the large gear of the other set.

The gears 20 and are mounted to turn about the same axis, this being represented by the shaft l0. They are, however, tur able independently of each other, The gear 30 has a fly wheel l secured thereto. A protective and enclosing casing 5 is provided for this fly wheel, which casing also serves as the mountor carrier for the large gear 20 of the second set. The crank arm 6 and handle by which the drill is operated, is also secured to the casing 5.

The first set of gears consisting of the pinion 2 and gear 20 correspondwith the two gears which are employed in the ordinary hand drill. The second set of gears consisting of the gear 3 and pinion 30 are added gears which are employed in order to rotatively connect the fly wheel 4 with the bitcarrying shaft 11, and also for the purpose of securing a higher rate of rotation for the fly wheel. Itis evident that the inertia of the fly Wheel depends to a very large extent upon its speed of rotation, and for this reason it is desirable to have it turn at a rela tively much higher rate than does the bitcarrying shaft 11.

The method of mounting the fly wheel illustrated does not vary materially, change the size of the drill or make it cumbersome to handle or operate. It will be found that with such a fly wheel the drill may be used to drill through such material as thin plates of metal without the objectionable effect usually found, due to the drill forcing its way through the sheet before it has entirely cut away all of the material.

It' is evident that many of the details of construction might be changed without in any essential way changing the principle of my invention. This principle does not include merely the mounting of a fly wheel upon a drill, but the mounting of a fly wheel upon a drill. in such a way as tomake it adapted for application to hand drills of small size, and so as to protect the mecha nisms essential thereto from injuring the user.

What I claim as my invention is:

1. In a hand drill, in combination, a rotative bit-carrying shaft, a small and a large bevel gear fixed to said shaft, complemental small and large gears independently turnable about the same axis and meshing each with its respective one of the first pair of gears, a fly wheel secured to the small gear of the second pair, a casing enclosing said fly wheel I and fixed to the larger gear of the second pair, and a turning crank fixed to said casing.

2. In a hand drill, a frame, a bit-carrying shaft journaled in said frame, a small and a large bevel gear secured to said shaft, a drum body having thereon a large bevel gear meshing with the smaller gear upon the bit-carrying shaft, said drum enclosing both of the said gears, a transverse shaft carried by the frame and having the drum journaled thereon, a fly wheel journaled upon the same shaft and positioned Within the drum and adjacent to its bottom, and a small gear secured to said fly wheel and meshing with the larger gear upon the bit-carrying shaft.

3. A drill comprising a frame, a bit-carrying shaft journaled in the frame, a large and a small gear secured to said shaft, a journal shaft mounted upon the frame at right angles to the bit-carrying shaft at one side only thereof, a small and a large gear independently journaled upon said journal shaft and at the same side of the bitcarrying shaft, said latter gears meshing each with its complemental one of the first pair, a fly wheel secured to the small gear of the second pair, a drum secured to the large gear of the second pair and enclosing the fly wheel and the second pair of gears, and means for applying power to turn said drum and the connected gears.

4-. The cmnbination in a hand drill, of a bit-carrying member, a fly wheel geared to the bit-carrying member to turn at a higher rate than the bit-carrying member, an operating crank and gears relatively connecting the crank with the bit-carrying member independently of the fly wheel connection therewith, and a pl'olll-ittllvt casing for all of said gears secured to and connecting the crank and the driving member of the bildriving gears.

Signed at Silver-dale, Kilsap County, lVashington, this 3rd day of November, 1926.

CARL E. LINDBERG.

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