US710782A - Portable pneumatic rotary drill. - Google Patents

Description

' No. 7|0 ,7s2. Patented Oct. 7, I902.

J. KELLER.

PORTABLE PNEUMATIC ROTARY DRILL.

(Application filed Aug. 13, 1902.

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(No Model.)

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No. 7|0,782. Patented Oct. 7, I902.

J. KELLER.

- PORTABLE PNEUMATIC ROTARY DRILL.

(Application filed Aug. 18, 1902.)

(lo Model.)

{Shani-Sheet 2,

UNITE STATES PATENT Farce,

JULIUS KELLER, OF'PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO PHILADELPHIA PNEUMATIC TOOL COMPANY, A CORPORATION OF NEE? JERSEY.

PORTABLE PNEUMATEC ROTARY DRlLL.

SPECIFICATION forming part of Letters Patent No. 710,782, dated October '7, 1902.

Application filed August 13, 1902. Serial No. 119,479. (N model.)

To all 1071/0717, it may concern:

Be it known that I, JULIUS KELLER, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Portable Pneumatic Rotary Drills, of which the following is a specifica tion.

My invention relates to improvements in various particulars in the construction of portable pneumatic rotary drills, wherein I employ a rotary engine and a novel construction of a reversing-valve, which is located intermediate of the inlet-passage for the motive fluid and said rotary engine, said reversing-valve directing the exhaust of the motive fluid downwardly into an exhaust-chamber located below the enginecylinder, while the lower portion of the casing of said exhaust chamber serves to support within it a chuck or tool holder.

It also consists of a novel manner of as sembling the rotary engine, reversing-valve, exhaust-chamber, and the holder, whereby a very compact form of tool is produced, and I am thus enabled to dispense with the employment of a boring-spindle, and consequently do not have to provide a journalbearing for said boring-spindle upon the engine-cylinder, as has been heretofore done in devices of this character.

It also consists of novel features of construction, all as will be hereinafter fully set forth, and particularly pointed out in the claims.

Figure 1 represents a side elevation, partly in section, of a portable pneumatic rotary drill embodying my invention. Fig. 2 represents a section on line a; :r, Fig. 1.

Similar numerals of reference indicate cor responding parts in the figures.

Referring to the drawings, the motive fluid enters through the passage 1 and the ports 2 when the sleeve 3 is in the position seen in Fig. 2 and passes thence through the passage 4 around the groove 5 of the reversing-valve 6 and thence into the chamber 7and port 8. The impact of the motive fluid upon the blades 9 causes the latter and their adjuncts to revolve, as will be understood by those skilled in this art, and this rotation is imparted to the extension 10, pinion 11, and idlers 12, which latter mesh with an internal stationary rack 13, which is retained between the upper and lower sections lat and 15,- which inclose the exhaust-chamber1(5, said section 14: serving to support the engine-cylinder and rotary engine therein.

17 designates yokerpins upon which the idlers are mounted, said yoke-pins engaging the yoke 18, whichis mounted upon the ballbearings 19.

2O designates the chuck or tool -socket. which is held in position by the nut 21, the extension 22 of the yoke being held in position by the nuts 23. The motive fluid when the ports are in the position seen in Fig. 2 revolves the engine from left to right and passes through the port 2st into the chamber 25 and thence into the ports 26 of the hollow cylindrical reversing-valve 6 and downwardly through the latter into the exhaust-chamber 16 through the outlet 27, the final exhaust to the atmosphere taking place through the port 28. The rotary sleeve 3 serves as a handle for manipulating the drill while in operation, and diametrically opposite thereto is located the handle 29, which is simplya hollow piece of tubing screwed or otherwise secured into the engine-cylinder 30, said handle having no exhaust passing therethrough. The reversing-valve has its lower portion 31 rotatably mounted in the top 32 of the upper section or cover 14: of the exhaust-chamber 16, while the upper portion of said reversingvalve has an extension 33, to which the handie 34 is secured, said handle being deflected downwardly, so as to be in convenient reach of the operator.

35 designates the feeding device,which consists of the threaded stem 36, which is secured to the head 37 in the top of the engine cylinder, said stem being engaged by the sleeve or female member 38, which is provided with the handles 39 and the center 40. If desired, a breast-feed (not shown) maybe employed, the same being interchangeable with the screw or force feed.

I make no claim herein to the screw or force feed, as it is a common right to supply feeding devices of this character in portable drills of this kind or to make the sameinterchangeable with a breast-feed, if desired. Neither do I herein-make any claim to the utilization of a handle to conduct the motive fluid to the drill, since it is a common right to do this or to utilize an opposite handle for the exit of the exhaust, as in the patent to Leach, No. 244,629, granted July 19, 1881.

I am aware that it has heretofore been proposed to provide a rotary engine adapted to drilling or boring with a reversing-valve, as in the patent to Noteman, No. 273,136, granted February27, 1883, and my invention therefore consists more particularly in the novel combination of a reversing-valve in a particular location with respect to its rotary engine and exhaust-chamber thereunder.

While my improved drill is especially adapted for metal boring or drilling, it is equally well adapted for wood-boring, as the same are analogous, and it is a fact that more power is required sometimes in boring certain kinds of wood than in ordinary metal-drillin g.

I make no claim to the specific form of rotary engine or specific construction of gearing, since the same are patented in a prior patent granted to me, No. 646,702, granted April 3, 1900, and the present invention consists more particularly in the novel manner, broadly, of assembling the rotary engine, the inlet-passage, reversing-valve, and exhaustchamber, whereby a compact and efficient portable drill is produced.

I desire, further, to call especial attention to the fact that I employ no boring-spindle in connection with my improved drill, since I dispense with such construction entirely, and consequently have no occasion to provide a journal-bearing for a boring-spindle upon my engine-cylinder. It will thus be seen that I employ simply a tool holder or chuck 20, which is simply mounted within the lower section 15 of the exhaust-chamber, said section being in no way connected with the engine-cylinder, so that upon the removal of said lower section all the parts are accessible for the purpose of inspection or repairs, and the motor can be employed for other uses, if desired.

I am aware of the prior constructions such as seen in the patent to Mofiet, No. 369,120, granted August 30, 1887, wherein a boringspindle is employed having a long bearing upon the engine-cylinder at one side thereofand to none of these prior art devices do I herein make my claim.

It will be apparent that various changes may be made by those skilled in the art which will come within the scope of my invention, and I do not, therefore, desire to be limited in every instance to the exact construction herein shown and described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a portable pneumatic drill, a cylin der, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, an upright reversing-valve arranged parallel to the axis of said engine and located intermediate of said passage and chambers, and an exhaust-chamber below said cylinder, said reversing valve exhausting downwardly directly into said exhaust-chamber, and serving to simultaneously connect either of said passages with the inlet-passage and the other with the exhaust-chamber.

2. In a portable pneumatic drill, a cylinder, a rotaryengine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, an upright reversing-valve arranged parallel to the axis of said engine and located intermediate of said passage and chambers, and an exhaust-chamber below said cylinder, said reversing valve exhausting downwardly directly into said exhaust-chamber, and serving to simultaneously connect either of said passages with the inlet-passage and the other with the exhaust-chamber, in combination with a chuck, rotatably supported upon means exterior to the engine-cylinder and power-transmission devicesintermediate said rotary engine and chuck.

3. In a portable pneumatic drill, a cylinder, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, an upright reversing-valve arranged parallel to the axis of said engine and located intermediate of said passage and chambers, and an exhaust-chamber below said cylinder, said reversing valve exhausting downwardly directly into said exhaust-chamber, and serving to simultaneously connect either of said passages with the inlet-passage and the other with the exhaust-chamber, in combination with a chuck rotatably supported upon the casing of said exhaust-chamber, and powertransmission devices intermediate said engine and chuck.

at. In a portable pneumatic drill, a cylinder, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, a reversingvalve located intermediate of said passage and chambers, said valve consisting of a hollow upright cylinder, having a passage therethrough, a groove at one side of said valve, ports on the opposite side of said valve, communicating with said passage therein, an exhaust-chamber below said cylinder, and a port in the lower portion of said valve discharging into said exhaust-chamber.

5. In a portable pneumatic drill, a cylinder, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, a reversing-valve located intermediate of said passages and chambers, said valve consisting of a hollow upright cylinder, having a passage therethrough, a groove at one side of said valve, ports on the opposite side of said valve communicating with said passage therein, an exhaust-chamber below said cylinder, and a port in the lower portion of said valve discharging into said exhaust-chamber, in combination with a tool-holder, mounted in the lower portion of said exhaust-chamber and power-transmission devices intermediate said tool-holder and rotary engine.

6. In a portable pneumatic drill, a cylinder, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, a reversing-valve located intermediate of said passages and chambers, said valve consisting of a hollow upright cylinder having a passage therethrough, a groove at one side of said valve, ports on the opposite side of said valve communicating with said passages therein, an exhaust-chamber located below said rotary engine, a valve-bearing in the top section of said exhaust-chamber in which said valve is mounted, a port in the lower portion of said valve discharging into said exhaust-chamber, and a handle on said valve whereby the latter is adapted to be operated.

7. In aportable pneumatic drill, acylinder, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, a reversing-valve located intermediate of said passages and chambers, said valve consisting of a hollow upright cylinder having a passage therethrough, a groove at one side of said valve, ports on the opposite side of said valve communicating with said passages therein,

an exhaust-chamber located below said r-otary engine, a valve-bearing in the top section of said exhaust-chamber in which said valve is mounted, a port in the lower portion of said valve discharging into said exhaustchamber and a handle on said valve whereby the latter is adapted to be operated, in combination with a tool-holder mounted on the lower portion of said exhaust-chamber and power transmission intermediate said tool- 'holder and rotary engine.

8. In a portable pneumatic drill, a cylinder, a rotary engine therein, an inlet-passage for the motive fluid, a plurality of chambers intermediate said passage and engine, a reversing-valve located intermediate of said passages and chambers, said valve consisting of a hollow upright cylinder, having a passage therethrough, a groove at one side of said valve, ports on the opposite side of said valve, communicating with said passage therein, an exhaust-chamber below said cylinder, and a port in the lower portion of said valve discharging into said exhaust-chamber, in combination with a rotary sleeve surrounding said inlet-passage and serving as a handle and a tube in engagement with the engine-cylinder and located diametrically opposite said inletpassage, said last-mentioned tube having no communication with the interior of said ongine-cylinder.

JULIUS KELLER.

Witn esscs:

E. HAYWARD FAIRBANKS, O. D. MCVAY.

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