US2689491A - Bit sharpener - Google Patents

Description

Sept. 21, 1954 Filed Dec. 18, 1952 L. BREDESEN BIT SHARPENER 2 Sheets-Sheet 2 M INVENTOR.

Leo firedese/z,

Patented Sept. 21, 1954 UNITED STATES PATENT OFFICE BIT SHARPENER Leo Bredesen, Greenwood, Wis.

Application December 18, 1952, Serial No. 326,651

3 Claims. 1

This invention relates to a bit or drill sharpener, and more particularly to a bit sharpener for attachment to a drilling machine.

The object of the invention is to provide a bit sharpener which can be readily attached to a drilling machine so that the sharpening of bits can be accomplished faster and more efiiciently.

Another object of the invention is to provide a bit sharpener which will enable the operator to sharpen the bits more efficiently and effectively, the bit sharpener of the present invention including a frame and a vertically movable hammer which drops by gravity to sharpen the bit.

ent during the course of the following description.

In the accompanying drawings, forming a part A of this application, and in which like numerals are used to designate like parts throughout the same:

Figure 1 is a side elevational view of the bit sharpener of the present invention, with parts broken away and in section.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a sectional view takenon the line 3--3 of Figure 1.

Figure 4 is a sectionalview taken on the line 4-4 of Figure 2.

Figure 5 is a sectional view taken on the line 5-5 of Figure 3.

Figure 61s a horizontal sectional view through the bit showing the spring clip being used.

Figure 7 is a plan view showing the working face of the hammer.

- Figure 8 is a plan view of the bit.

Figure 9 is a fragmentary elevational view showing the lower portion of the hammer.

Figure 10 is a fragmentary elevational view showing the bit, and with parts broken away and in section.

Figure 11 is a modified side elevational view of the hammer, with parts broken away and in section.

Figure 12 is a plan view of the assembly shown in Figure 11. I

'Referring in detail tothe drawings, the numeral I0 designates a frame which may be fabricated of any suitable material such as metal, and the frame [0 includes a plurality of vertically disposed spaced angle irons or beams ll, I2, I4 and [5, Figures 1, 2 and 3. Arranged below the the traveling hammer 2G.

frame i0 is a horizontally disposed base l6, and

pivotally connected to the base I6 by means of a pin it is a housing l1. provided with a tapered socket I9 for snugly receiving therein a tapered casing 20.

The casing is provided with a threaded bore 2| for receiving therein the threaded end 23 of the bit 22 which is to be sharpened.

The numeral 24 designates the teeth on the working face of the bit 22, Figure 8, and the bit 22 may also be provided with a pair of diametrically opposed grooves or cut-outs 25 for a purpose to be later described. Movably mounted above the bit 22 is a vertically movable hammer 26. The hammer 2B is adapted to drop by gravity to sharpen the teeth 24 of the bit 22, and the hammer 26 includes a pair of opposed tongues 28 which are adapted to extend into the grooves 25 to properly align the hammer 26 with the bit 22. The working or lower face of the hammer 26 is further provided with a plurality of spaced teeth 29 which serve to sharpen the: teeth 24 of the bit 22 when the hammer reaches the bottom of its drop.

Mounted on the upper portion of the bit 22 is a sleeve 3! which helps form aguideway for A jacket 32 is arranged above the sleeve 3I, and suitable pins 30 extend through the jacket 32 and into slots 21 which are formed in the hammer 26, the pins 30 cooperating with the slots 21 to prevent the hammer 26 from rotating or moving out of its proper aligned position with respect to the bit 22. The upper end of the hammer is provided with an opening or aperture 33 whereby a suitable cord or cable which may be connected to a pulley can be used for raising the hammer 26 after the hammer has dropped by gravity to sharpen the bit 22.

For use in pivoting or moving the bit 22 from a horizontal position to the position shown in Fig ure 1, a spring clip 35 is provided, the spring clip 35 including a pair of opposed fingers 34 which are adapted to snugly seat within the grooves 25 of the bit 22. A rod or handle 36 has one end connected to the spring clip 35, Figure 6, and a screw 39, and a handle 40 is connected to the The housing I! is outer end of the screw 39. Thus, by manually rotating the handle 40 the block 38 can be moved from left to right or vice versa, Figure 3, whereby the block or stop member 38 can be positioned as desired. Cooperating with the stop member 33 is a clamp which includes a: clamping bar 4|, and the clamp and block or stop member 38 serve to maintain the bit 22 immobile in its adjusted position. The bar 4| of the clamp is pivotally connected to the frame by means of a pin 42, and a clamping bracket A3 is arranged in engage-- ment with the other end of the bar 4!, there being a manually operable screw member Mi for locking the bar M into the clamping bracket 43;

Extending from the frame H] are support members 45 which are provided with suitable openings 46 whereby securing elements such as bolt and nut assemblies can be extended through the openings 46 into engagement with a suitable supporting structure such as a drilling machine.

Extending between the beams l2 and i l and secured. thereto is a horizontally disposed bar or cross piece 58, there being a similar bar 49' extending between the beams I- I: and i5- and secured thereto. The bars as and 49 are arranged in pairs one above the other, there being two of the bars 48' and two of the bars 59. Movably mounted within the frame to is a pair of horizontally disposed arms ll, the arms 41 extending between the bars 48 and 4+) and adjustably connected thereto. A plate 5% is secured to the upper surface of each of the arms l! by suit able securing elements such as screws or bolts 5 l, and the plates 59 are secured to the jacket 32 which slidably houses the hammer 26. Thus, upon movement of the arms 41 the position of the jacket. 32 and hammer 2t can be regulated or adjusted to properly align the hammer 28 with the bit 22 below. For finally adjusting the arms 41 and consequently the hammer 26, a pair of screw members 52 are operatively connected to each of the arms A7. A handle 53 is provided on the outer end of the screw member 52- for rotating the latter, and arranged in threaded engagement with each of the screw members 52 is a nut 54 having a body portion 55-. A pin or bolt 9 is secured to each ofv the nuts- 54, inany suitable manner, as for example: by welding, and the arms 47 are pivotally mounted on the bolts 9, there being. securing elements 8- for maintaining the arms 4?. pivotal'ly connected to the bolts 9-.

Referring to Figures 11 and? 12', there is shown a modified hammer assembly whereby the ham-.- mer is indicated by the numeral 56;. the hammer 56 adapted to drop by gravity int the same mane ner as the previously described hammer 26. The hammer 56 includes a lower threaded: portion 51' which is arranged in threaded engagement with a. collar 58; the bottom of the collar SS being open and provided with a tapered seat 59 which is adapted to cooperate with the bit 2d: to help align the hammer and bit. Teeth 6''! are arranged in the lower surface of the" hammer 56 for sharpening the teeth on the bit,.and tongues 60 are arranged on the lower-end of the hammer 56- for seating inthe grooves 25 to maintain the hammer and bit in their proper aligned rela'. tion..

In use, the housing I! may be pivoted to" a horizontal position about the-pin l-8-,itheclampingbracket 43 having first been disengaged. Then,

the end 23 ofthe bit 22- can bearranged in threaded engagement? with. the bore 21-. the spring: clip- 35 is arranged in engagement with the bit 22 and the hand-grip 31 is manipulated in order to pull or lift the bit from its horizbntal position to the raised position shown in Figure 1. Then, the bar 4| can be clamped to maintain the bit 22 immobile, and the stop block 38 can be adjusted or positioned to prevent accidental shifting of the bit 22. The hammer 26 can be raised by means of a cable which can be engaged in the opening 33, and when tension on the cable or hammer 25' is released, the hammer 26' Will drop by gravity so that the teeth 29 of the hammer 26 will sharpen the teeth 24 of the bit 22. This cycle of operation is repeated whereby the hammer can be alternately lifted and permitted to drop by gravity in order to sharpen the teeth ofthe bit. The screw members 52 can be rotated by means of the handles 53 in order to properly align the hammer 26 With the bit 22 therebelow.

The present invention can be attached to a drilling machine by means of bolts passing through the openings 45- inthe support members 45. With the present invention attached to a drilling machine a large number of bits can be conveniently sharpened. The bit sharpener of the present invention is very useful and will facilitate the sharpening of bits by persons in the trade. Also, when the bit sharpener of the present invention is attached to a machine, the sale of such machine will be facilitated. The bit sharpener of the present invention can be readily attached to a drilling machine and will make the machine more valuable. Thus, a drilling machine with the attachment of the present invention can beset up in a shop or can be takento the job whereby a great number of bits bequickly sharpened with ease and efficiency. Also, bits be sharpened during the drilling opfera tions and the sharpening will be more eflicient than if it was done by hand. Furthermore, the sharpener includes a gravity drop which is the natural way for a heavy hammer to operatesmoothly. Adjustments are provided so that-the hammer can be aligned with the various partsiof the device.- Also; the bit can be sharpened anda means is provided for 1 ting the bit and ham; mer totheir proper positions.

I claim:

1-. A bit sharpener comprising. a frame,- a base arranged below said frame, a housing pivotally' connected-t0- said base and provided with a tapered socket, a casing seated in said socket and provided a threadedbore for receiving therein the threaded end of a bit to-besliarpened, there beinga pair of opposed grooves in said bit to be sharpenedaa ,cl-iparranged in engagesmentwithsaidbit: for aligning said bit, a handle having one end connected to said spring clip for manually mowing the bit, aclampf for maintaining said bit immobile in its adjusted position, and a hammer mounted for vertical mover?" ment above said bit and: provided with teeth thereon, there being tongues in said hammer for seating in the grooves in said bit.

2.. The apparatus. asidesc'ribed in claim 1, and further includingmeans: for guiding said ham?- mer during its movement and means for adiusts' ing. the position of the hammer in said frame;

3. In a bit sharpener, a frame including 9)- plurality ofvertically disposed-- beams. a horizontally disposed base arranged-below said frame,

a housing pivotally connected tosaid base and provided with a tapered socket for receiving: therein a' casing; there beinga threaded borein saidcasing for receiving a bit to be" sharp;

mer slidably mounted in said Jacket, the lower working face of said hammer being provided with a plurality of spaced teeth, said housing further including a pair of opposed tongues on its lower end, there being an aperture in the upper end of said hammer to be engaged by a lifting line, a spring clip for engaging the bit to be sharpened and including a pair of opposed fingers, a rod having one end connected to said spring clip, a hand grip mounted on the other end of said spring clip, a stop member for maintaining the bit immobile in its adjusted positions, a screwconnected to said stop member, a handle connected to the outer end of said screw, a clamp cooperating with said screw member and including a clamping bar having one end pivotally connected to said frame, a bracket arranged in engagement with the other end of said clamping bar, a manually operable screw for locking said clamping bar in said bracket, support members extending from said frame for attachment to a supporting structure, crosspieces supported by said frame, a pair of horizontally disposed arms movably mounted within said frame and adjustably connected to said crosspieces, a plate secured to the upper surface of each of said arms, and said plates being secured to said jacket, and a pair of screw members for adjusting said arms.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 902,146 Gilson Oct. 27, 1908 996,807 Smyth July 4, 1911 1,461,011 Halleck July 3, 1923 1,531,491 Macready et al. Mar. 31, 1925 1,870,723 Friedman Aug. 9, 1932 1,875,586 Friedman Sept. 6, 1932 2,443,814 Curtis June 22, 1948 2,450,621 Wineman Oct. 5, 1948 2,645,138 Mitchhart July 14, 1953 FOREIGN PATENTS Number Country Date 3,983 Great Britain Feb. 23, 1893

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