US1370061A - Throttle-valve for drills - Google Patents

Description

1,370,061. c.. Patenmm.1,1921..

Q 2 SHEETS- snuff- W. A. SMITH.

' lTHRQTTLE VALVE Fon DRILL-s. APPLICATION FILED MAILI23| I9I8 UNITED STATS-Es PAENT clarion.

WILLIAM A. SMITH, OP EASTON, PENNSYLVANIA, AssIGNOR To NeEEsoLL-RAND COMPANY, OE JERSEY CITY, NEW JERSEY, A CORPORATION OP NEW JERSEY- lTHRoTTLE-vALvi-i POR DRrLLs.

Specification of Letters Patent.

`Patented Mar. 1, 1921.

Application filed March 23, 1918.l Serial No. 224,333.

T0 all who/m, t may concern y Be it known that I, VILLIAM A. SMITH, a citizen of `the United States, residing at Easton, in the county of Northampton and 'State of Pennsylvania, have invented a certain new and useful Improvement in Throttlc-Valves for Drills, of' which the following is a specification.

This invention relates to percussive tools, and in particular to a throttle valve for self rotating hammer drills.

In many forms of percussive or hammer drills a motor is provided which, being supplied with'motive .fluid of the same kind as supplied to the percussive element, produces rotation of the drill or other mining implement. This necessitates a throttle valve to vary and control the supply ofmotive fluid to the percussive and rotating elements of the drill, which elements take varying proportions offluid, depending upon the class of rock being drille l The objects, therefore, ofthe present invention are to provide a throttle valve for hammer drills or other rotating rock drills which will control the supply of fluid to the drilling and rotating mechanism; that will permit the regulation of fluid to the rotating mechanism while the drill is in Operation, and. will cut OH the supplyl of fluid to the rotating mechanism when the drill is stopped. Another object is to permit the valve forl varying the supply of fluid to the throttle valve and to be moved bodily thereby so that when the throttle valve is opened the valve for supplying the rotating mechanism will not require readjustment but will be brought back to the same place relatively to its port to which it was previously adjusted.

With these and other objects in view, my invention consists in the features of construction set forth in the following specification and illustrated inthe accompanying drawings. y Y A In the drawings annexed hereto and forming a part hereof:

Figure 1 showsa longitudinal view of the drill with the throttle valve shown in section;

Fig. 2, a longitudinal view of the complete tool in section;

Fig. 3, a view in cross section of the rotating motor;

Fig. 4, a cross section through the throttle valve taken on the line 4 4 of Fig. v1;

Fig. 5, a view similarfto Fig. 4, taken on the line 5--5 of Fig. l. Referring more. particularly to the drawings, 1 Shows the cylinderof a hammer drill having a throttle valve 2 made in accordance withthe present invention. At 8 is shown the piston adapted lto reciprocate within the cylinder l, being supplied with motive fluid through passages 4 to the various pressure areas of the piston 3. The drill rotatingv 'mechanism 5 comprises a geared motor which is supplied with motive vfluid through the passage 6. It is the function of the throttle valve 2 to control the supply of fluid through the passages 4 and 6 in a manner presently to be described to vary the power and 'speed of theA rotating motor. Y f f Thethrottle valve 2 comprises a 'casing which is preferablyrmade integral with the cylinder l( This is bored to a taper from one end to the other, as is usual, and fitting this bored section is a hollow sleeve 7 rotation of'which opens and closes passages to the ports of the drill. For this purpose the sleeve is provided with two ports 8 and` 9 vextending throughy the lateral face ofl the sleeve, as clearly shown in Fig. 1. The port 8 opens and closes communication with the passages 4 controlling the operation of the piston 3 while the port 9 vopens and closes the passage 6 admitting fluid to the rotating motor 5.l It is obviousthat the speed` and power of the rotating motor 5 must be regulated for the different types and hardness of rocks in which the hammer drill is,being used. This is accomplished by means of an independently operated valve placed within the throttle valve 2 as shown at lO. Within the hollowed section of the sleeve 7 is placed the valve 10 having a portion tightly fitting the inside of the sleeve 7 about the port 9 so that rotation of the valve 10` relatively to the sleeve l'' will open and close the i port '9. This portion of the valve 10 is provided with flattened portions 11 permitting the passage of fluid past this portion of the valve and permitting it to enter the port 8, one edge covering or uncovering the both ports, namely, 8 and 9. However, the auxiliary valve 10 Within the sleeve 7 may be independently operated by means of its that is, closes or opens commuication With Y passages 4 and 6, so that When the drill is shut downboth the piston 3 and rotating motor 5 are stopped. lVhen the drill is started, ,movement of the handle 12 to open the passage l to fluid pressure also opens the passage 6, and this movement of valve 2 by means of handle 12 does not affect the position of valve 10 in relation to port 9,V

sol that unless the handle 13 is moved relative to handle 12 the speed of the rotating motor 5 is not affected and does not have to be adjusted each time the Vdrill is started.

The passage 6 at the point Where it joins the throttle valve 2 is enlarged, at 16, so that the port 9 opens into this enlargement 16 of the passage 6 before the port 8 opens.

This enables the rotating motor 5 to be started and brought up to speed before the piston 3 is'started. A movement of about forty five degrees of the handle 12 opens port 9 into passage 6 and a further movement of about forty live degrees of this 'handle opens the port S and passage Ll, the

passage 6 being still kept open. This is clearly shown in Figs. 4: and 5.

At one end of the throttle 'valve 2 is the plug 14 and nipple 15, as is usual in this type of valve, through which fluid is'supplied from an outside source to the space Within the sleeve 7.

In operation, the handle 12 is first moved to its open position, after which the handle 13 is adjusted relatively to handle 12 so that the rotating motor 5 is regulated to the speed desired. In shutting off the drill the handle 12 is simplvmoved back to its closed position, which closes both ports 8 and 9. To start up the drill it is simply necessary to move handle 12 to its open position, which will also open port 9 to the position to which it had previously been adjusted. y

It is to be understood that Whilethe presentV showing and description disclose only one specific embodiment of the v present invention, otherV forms and modifications are included Within the spirit and scope of the invention, asfexpressed in theY` appended claim.

lVhat I claim is:

In a fluid operated lpercussive tool, the combination of a reciprocating motor, a rotation motor, and a throttle valve comprising a casing having a tapered bore provided Withan inlet at the larger end and lateral supply passages lleading to the said motors respectively, a hollow 'sleeve rota'- table in said bore andlhaving 'admission ports controlling said supply passages, a handle for operating said sleeve, an independently operated auxiliary valve Within the said sleeve and movable therevvith'having a stem, and a plug provided with flattened sides, said plug controlling the admission port in the sleeve leading to the rotation motor but permitting the passage of motive fluid from the said inlet in the casing past the plug and through the sleeve to the ports leading to the reciprocating motor anda separate handle forgoperating said independent auxiliary valve.

In testimony whereof, I have hereunto set my hand.

WILLIAM a. SMITH.

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