US1219478A - Drill-sharpener. - Google Patents

Description

Patented Mar. 20, 1917! 3 SHEETS-SHEET I.

E. L. OLDHAM.

- DRILL SHARPENER.

APPLICATION men mm, I915- 1,219,478.

III"

I-llm EDWARD L. OLDI-IAM, OF DENVER,

MANUFACTURING COMPANY, WARE.

DRILL-SHARPENER.

Specification of Letters Patent.

COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL OF DENVER, COLORADO, A CORPORATION OF DELA- ratemea Mal eatery.

Application filed April 5, 1915. Serial No. 19,316.

To all whom it may concern:

Be it known that I, EDWARD L. OLDHAM, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, haveinvented new and useful Improvements in Drill-Sharpeners, of which the following is a specification. 1

The present invention relates more particularly to the means for shaping and sizing drill bits and the like, said mechanism being normally associated with the sharpening means for convenience and operation.

One of the principal objects of the present invention is to provide a simple, novel, and practicable structure, in which the coacting dies may be initially separated in order that the bit may be easily placed in position and thereafter the die mechanism may be set into operation, the entire operation being controlled in a simple and effective manner.

In the drawings Figure 1 is a side elevation of the preferred embodiment of sharpening apparat-us.

Fig. 2 is a vertical sectional view on the line 22 of Fig. 1.

Fig. 3 is a detail cross sectional view on the line 3-3 of Fig. 2.

Fig. 4 is a vertical sectional view on an. enlarged scale of the valve mechanism, with the ports shown diametrically opposite for illustrative purposes, and

Fig. 5 is a horizontal sectional view on the line 5-5 of Fig. 1.

Similar reference numerals designate corresponding parts in all the figures of the drawings.

In the embodiment base of the machine is designated disclosed, the bed or generally by the reference numeral 6, and mounted upon one side of the same is the die mechanism. To this end a guide yoke 7 is employed suitably secured on the base or bed, and supporting a pair of coacting die members 8 and 9. The lower of these die members 8 is suitably fixed against movement, while the upper member 9 is capable of vertical reciprocation, the yoke having guide flanges 10 on its rear side and detachable plates 11 on its front side coacting therewith, forming guideways for said die 9.

Mounted in the upper end of the yoke 7 is an actuating motor, comprising a cylinder member 12 in which operates a recipro-' catory piston 13 having a piston rod 14:

cylinder member 12 I other'words, so that the upper surface projecting downwardly beyond the cylinder member into the yoke, said piston rod being suitably secured to the (Lie 9, and thus causing its reciprocation on the reciprocation of the piston 13. t is believed to be unnecessary to enter into a detailed description of the piston 13. It may be stated, however, that'it is provided with an internal constant pressure chamber 15, into which motive fluid is introduced through a tube 16 extending inwardly from the upper head of the cylinder member, the motive fluid being distributed from the chamber 15 to opposite pressure surfaces 17 and 13 by suitable ports and passages in order to cause the reciprocation of the piston, and consequently the hammering action of the die 9. Briefly explained, the arrangement of the said ports and the operation is as follows :-The chamber 15 of the piston has a reduced rear end 5, which snugly receives the front end of the tube 16, and said tube 16 has a reduced portion 16. The cylinder member 12 has an annular internal groove 12 in its lower portion with which communicates a longitudinal groove 13 formed in one side of the piston 13. A port 15", communicating with the internal constant pressure chamber 15, is also arranged to communicate with the groove 12. Another annular internal groove 12 is formed in the cylinder member 12 and is in communication with a suitable exhaust port not shown.

WVith this arrangement, when motive fluid passes through the tube 16 into the chamber 15, with the ports as shown in Fig. 2, said motive fluid will pass out through the port 15" and thence through the groove 12 and groove 13 into the lower portion of the cylinder member 12, so that it will operate against the surface 17 of the piston and cause the elevation of said piston, the exhaust above the piston escaping freely from the exhaust groove 12*. When the piston is elevated, the reduced portion 15 piston will register with the reduced portion 16 of the tube 16, and consequently the motive fluid will pass from the constant pressure chamber 15 around the tube 16 and enter the above the piston, or in 105 it will operate against 18 of said piston. The port 15 will now be closed by the wall of the cylinder member 12 between the ports 12 and 12*, but the necessary exhaust from 110 of said the lower end of the cylinder member can take place through the groove 13, the upper end of which will be in communication with the exhaust groove 12 This operation will be repeated, so that the piston will be reciprocated and of course the die member 9 moved with it. The supply port for delivering motive fluid to the tube 16 is shown at 19 in the upper head of the cylinder member, and another supply port 20 leads to the lower portion of the cylinder member beneath the lower pressure face 17. This latter port 20 is for delivering a supplemental supply of fluid under pressure to the lower end of the piston, for the purpose of elevating the same, and thereby separating and holding separated the dies 8 and 9.

For the purpose of controlling the supply of fluid to the motor, the mechanism hereinafter described is preferably employed. A valve casing 21 is suitably mounted on the rear portion of the base of the machine, and as shown in Fig. 41, is provided with an internal annular groove 22, with which communicates a supply pipe 23 leading from any suitable source of fluid under pressure. Another groove 24: is located within the casing 21 above the groove 22, and from the groove 24, a pipe 25 leads to the inlet port 19 for the actuating fluid of the motor. Below the groove 22 an outlet port 26 is in communication with a pipe 27 which leads to the supplemental port 20 in the cylinder member 12 of the motor. Mounted to reciprocate in the chamber 28 of the casing 21 is a piston valve, comprising an upper head 29 and a lower head 30 connected by a neck 31. The lower head is provided with an annular groove 32 in communication with the space surrounding the neck 31, through the medium of a port 33. This piston valve is provided with a stem 31- extending downwardly through and below the lower end of the valve casing 21, where it rests upon the rear end of a treadle lever 35 fulcrumed between its ends, as shown at 36 on the base of the machine, and having a treadle plate 37 on its front end. A coiled spring 38 surrounds the projecting end of the valve stem 34, the upper end of this spring bearing against the lower head 39 of the valve casing, while the lower end of said spring bears upon a. collar 10 secured to the valve stem. The spring thus tends to normally move the valve to its lowermost position. A spring-pressed holding dog 41 is mounted in the lower valve casing head 39, and has a tapered inner end arranged to engage in a groove 12 formed in the portion of the valve stem 34 that is slidable in the head 39.

Briefly described, the operation of the apparatus is as follows: When the parts are in the position shown in Figs. 1, 2 and 41, even though air or other fluid under pressure be supplied to the pipe 23, it will be evident that this supply will be entirely out off from the motor. Assuming now that it is desired to introduce a bit between the dies and operate upon the same,the workman places his foot upon the treadle 37 and moves the samedownwardly a short distance. As a result the piston valve will be elevated until the groove 32 of the lower head 30 registers with the outlet port 26, and thereupon the fluid under pressure will pass through the ports 33 and 26 into the pipe 27, and will enter the cylinder member 12 below the piston, thereby raising said piston and conse quently moving the die 9 upwardly from the die 8. This fluid will hold the dies separated. The workman thereupon introduces the bit into the proper die seats, and having properly positioned the same, presses the treadle plate 37 farther downwardly. The groove 32 will then be carried above and out of communication with the port 26, but

the head 29 being also moved upwardly above the groove 24, communication between the grooves 22 and 24 will be established. As a result, motive fluid will pass into the pipe 25, and thence to the supply port 19 of the motor, entering the constant pressure chamber 15 of the piston. From this pressure chamber, it will be distributed in a manner well understood to cause the reciprocation of the piston and consequently the hammering action of the dies. Having completed this operation, the operator releases the treadle 37, whereupon the piston valve will move downwardly,the groove 32 will again be brought into register with the port 26, and fluid under pressure will conse quently enter the lower end of the cylinder member and raise the piston, thereby again opening the dies to permit the ready removal of the tool.

From the foregoing, it is thought that the construction, operation and many advan tages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size,

shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is

1. In apparatus of the character set forth, coacting die members, a motor for operating the same, means for supplying motive fluid under pressure to the motor and distributing it therein to repeatedly actuate it, means for V the same, means for supplying motive fluid under pressure to the motor and distributing it therein to repeatedly actuate it, means for supplying motive fluid under pressure to the motor to hold it in position with the dies separated, and a common valve for consecutively controlling bot-h fluid supplies.

3. In apparatus of the character set forth, coacting die members, a motor for operating the same, means for supplying motive fluid under pressure to the motor and distributing it therein to repeatedly actuate it, means for supplying motive fluid under pressure to the motor to hold it in position with the dies separated, and common means for controlling both fluid supplies and admitting the motive fluid first to the motor to separate the dies and afterward to the motor to repeatedly actuate the same.

d. In apparatus of'the character set forth, coacting die members, amotor comprising a cylinder member and a piston operating therein, means for supplying motive fluid toopposite faces of the piston in the cylinder member to repeatedly actuate the piston, means for also supplying motive fluid under pressure to the piston for moving the same and holding it in a position with the dies separated, and means for controlling the supplies of actuating fluid and holding fluid.

5. In apparatus of the character set forth, coacting die members, a motor comprising a cylinder member and a piston operating therein, means for supplying motive fluid to opposite faces of the piston in the cylinder member to repeatedly actuate the piston, means for also supplying motive fluid under pressure to the piston for moving the same and holding it in a position with the dies separated, and a common valve for controlling the supply of actuating fluid and the supply of the holding fluid.

(3. In apparatus of the character set forth, coacting die members, a motor comprising a cylinder member and a piston operating therein, means for supplying motive fluid to opposite faces of the piston in the cylinder member to repeatedly actuate the piston, means for also supplying motive fluid under pressure to the piston for moving the same and holding it in a position with the dies separated, and a valve having a back and forth movement and successively admitting fluid to the holding supply means and then to the actuating supply means.

7. In apparatus of the character set forth,

- the combination with coacting die members,

of a motor for actuating the same, comprising a cylinder member and a piston operating therein and having opposing surfaces against which motive fluid is brought to' actuate the piston, means for supplying motive fluid to the cylinder member and distribut- Copies of this patent may be obtained for ing it to the opposing surfaces to actuate the piston, and means for admitting a supplemental supply of fluid under pressure against a surface to move the piston in a direction to separate the dies and hold the same separated.

8. In apparatus of the character set forth, the combination with coacting die members, of a motor for actuating the same, comprising a cylinder member and a piston operating therein and having opposing surfaces against which motive fluid is brought to actuate the piston, means for supplying motive fluid to the cylinder member and distributing it to the opposing surfaces to actuate the piston, means for admitting a supplemental supply of fluid under pressure against a surface to move the piston in a direction to separate the dies and hold the same separated, and a common valve controlling both supplies.

9. In apparatus of the character set forth, the combination with coacting die members, of a motor for actuating the same comprising a cylinder member and a piston operating therein and having opposing surfaces against which motive fluid is brought to actuate the piston, means for supplying motive fluid to the cylinder member and distributing it to the opposing surfaces to actuate the piston, means for admitting a supplemental supply of fluid under pressure against a surface to move the piston in a direction to separate the dies and hold the same separated, and a common valve movable in opposite directions for controlling both fluid supplies and admitting fluid alternately thereto.

10. In apparatus of the character set forth, the combination with coacting die members, of a motor for actuating the same comprising a cylinder member and a piston operating therein and having opposing surfaces against which motive fluid is brought to actuate the piston, means for supplying motive fluid to the cylinder member and distributing it to the opposing surfaces to actuate the piston, a valve casing having an admission port and spaced outlets, one of said outlets leading to said motive fluid supply of the cylinder member, the other leading to a pressure surface of the piston, and a piston valve in the casing having a plurality of channels communicating with the fluid supply and alternately movable into communication with said outlets.

In testimony whereof I have hereunto set my hand in presence of two subscribing'witnesses.

EDWARD L. OLDHAM. W'itnesses:

F. L. EMERSON, A. H. SKAER.

five cents each, by addressing the Commissioner of Patents- Washington, D. G.

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