US1023476A

US1023476A - Machine for forming and sharpening drill-bits and the like.

Info

Publication number: US1023476A
Application number: US60063311A
Authority: US
Inventors: Harry Johan Hjalmar Nathorst; Gotthard Lundstroem
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-01-03
Filing date: 1911-01-03
Publication date: 1912-04-16
Anticipated expiration: 1929-04-16

Description

H. J. H. NATHORST & G. LUNDSTRUM. MACHINE FOR FORMING AND SHARPENING DRILL BITS AND THE LIKE.

APPLICATION FILED JAN. 3, 1911. 1,023,476.

Patented Apr. 16, 1912.

2 SHBETSSHEET 1.

COLUMBIA l'LnNuukAPH 60.,WASHINOTON, D. c.

V H. J. H. NATHORST & G. LUNDSTRUM. MACHINE FOR FORMING AND SHARPENING DRILL BITS AND THE LIKE.

APPLICATION FILED JAN.3, 1911. Patented Apr. 16,

2 8HBETS-SHEET 2.

I/I/IIIIM wit n eases COLUMBIA PLANOGRAPH CO-.\VASIHNGTON. n. c.

UTTED ST non.

OF GELLIVARE MALMFALT, SWEDEN.

MACHINE FOR FORMING AND SI-IARPENING DRILL-BITS AND THE LIKE.

To all whom it may concern:

Be it known that we, HARRY J OHAN TTJAL- MAR Na'm'onsr and GO'ITHARD LUNns'rRoM, subjects of the King of Sweden, residing at Gellivare Malmfalt, Malmberget, Sweden, have jointly invented new and useful Improvements in Machines for Forming and Sharpening Drill Bits and the Like, of which the following is a specification, reference being had to the drawings accompanying and forming a part hereof.

This invention relates to a machine for forming or sharpening cutting edges on drill bits or other similar tools according to the method forming the subject-matter of my application for patent Ser. No. 531,806, filed Dec. 7, 1909.

In forming or sharpening cutting edges on drill bits and the like, especially cruciform drill bits, co-called star bits, used in rock drills, it has been usual to repeatedly heat the drill bit and work the same in the machine. This procedure is time-wasting and disadvantageous in respect of the durability of the drill bit.

The object of this invention is to provide a machine by means of which the cutting edges of the drill bit or the like may be formed or the sharpening effected with less labor and in one heating, and the invention consists in the combination of known elements hereinafter set forth and claimed.

In the drawing, we have shown a machine embodying the invention.

Figure l is a side view of the whole machine. Fig. 2 is a plan View of the same. Fig. 3 is a central longitudinal section "of the sharpening machine proper which operates the end of the drill bit for forming the star. Fig. a is a cross-section of the same on line AA in Fig. 3. Fig. 5 is a plan View of the same.

Referring to Figs. 1 and 2 of the drawings, 1 is a standard placed on a bottom plate 2. Mounted on the said standard are a guide 3 for the sharpening machine, a frame at for the machine operating the end of the drill bit laterally, an anvil 5 cooperating with the hammer 6 of the said machine, and a beam 7 preferably U-shaped in cross-section and serving to support the drill bit and the adjustable abutment 8 for the same.

The sharpening machine proper is shown on a larger scale in Figs. 3 to 5. It is shown mounted on a slide 9 movable along the Specification of Letters Patent.

Application filed January 3, 1911.

Patented Apr. 16, 1912. Serial No. 600,633.

guide 3. Placed at the ends of the said slide 9 are supports l0, 11 for the sharpening machine, preferably a pneumatic hammer machine of' any suitable type, such as the wellknown Flottmann type. Movable in the cylinder 12 of the said machine is a piston 13 having a part 1% of less diameter extendng to the stamp 15, said stamp being rigidly attached to a sleeve 16 having longitudinal lists or ribs engaging corresponding grooves 17 in the forward part of the pis ton. The distribution of the compressed air is controlled in usual manner by a valve 18 cooperating with the exhaust openings 19 in the cylinder 12.

The part 14. of the piston is provided, behind the grooves 17, with windings 20 of very large pitch engaging corresponding windings in a ratchet sleeve 21 surrounding the said part of the piston. The sleeve 21 is provided at its periphery with ratchet teeth engaged by spring-actuated pawls 22 in such a manner that the said sleeve is free to turn when the piston moves forward (toward the stamp), whereas it is locked in position when the piston moves backward so as to cause the piston and, thereby, the sleeve 16 surrounding the fore part of the piston, and the stamp 15 secured to the said sleeve 16, to turn an angle correspmnding to the pitch of the windings 20. It will thus be seen that the stamp 15 is turned a certain angle each time the piston recedes from the same.

The slide 9 is provided with arc-shaped guides 23, 24 for the supports so that the cylinder may be placed in a desired inclined position relatively to the longitudinal direction of the drill bit operated upon. The cylinder is secured in position by a thumbscrew 25 passing through an oblong slot in the rear support 11 and screwed into the rear guide 241. The

supports

10, 11 are shown connected by rods 26 and springs 27.

The slide 9 is moved longitudinally by means of a lever 28 (Fig. 1) connected by a link 29 to the slide or by means of a treadle 30 connected by a rod 31 to a lever arm 32 pivoted at 33 and connected by a link 3-1 to the lever 28. By this means the stamp 15 may be kept pressed against the drill bit during working.

A crank arm 35 connected to the plug of a cock is used for opening or closing the pressure conduit.

The hammer 6 forms part of a pneumatic hammer machine of any suitable construction, such as an ordinary piston rock drill. A treadle 36 (Fig. 2) is connected by a rod 37 (Fig. 1) to a crank arm 38 connected to the plug of a cock for controlling the supply of pressure fluid.

The abutment 8 for the drill bit is connected by a chain 89 running on rollers 4:0 to a chain-wheel a1. Connected to the said chain-wheel is a ratchet wheel 42. This ratchet wheel and thereby the chain-wheel may be turned by a crank 43 in one or the other direction according to the position of the adjustable ratchet pawl 4-4:.

The machine works as follows: The drill bit to be operated upon is placed with its heated end in the anvil 5, and the abutment 8 is moved by the crank i3 into a position in which it abuts with the rear end of the drill bit. The stamp 15 of the sharpening machine, which has before been placed in the desired angle relatively to the longitudinal direction of the drill bit, preferably an an gle of about 5, is moved by the lever 28, or the treadle 30, into close contact with the fore end of the drill bit. Thereupon the crank 35 is operated to admit pressure fluid to the cylinder of the sharpening machine by which the piston is caused to reciprocate very rapidly so as to make impacts upon the stamp and cause the same to cut into the drill bit. After each impact upon the stamp the latter is automatically turned a certain angle and, on account of its engagement with the drill bit, causes the latter to turn with it. By this means the cutting edges are rapidly formed, Withoutnecessitating the drill bit to be reheated. WVhen the cutting edges are finished, the sharpening machine is thrown out of action and the hammer 6 is thrown into operation for compressing the drill bit laterally.

WVe claim:

In a machine for forming and sharpening cutting edges on drill bits and the like, the combination of a rotatably mounted stamp, means for subjecting the said stamp to pressure to impart longitudinal movement thereto, means for rotating the said stamp during working, and means for rotatably holding the drill hit up to the said stamp, at an angle to the same.

HARRY JOHAN HJALMAR NATHORST. GOTTHARD LUNDSTRGM. Vitnesses:

G. N. FRIs'rnDT, E. L. A. BJORKMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington. D. C.