US1371721A - Exhaust-valve for hammer-drills - Google Patents

Description

L. C. BAYLES.

EXHAUST VALVE FOR HAMMER DRILLS.

APPUCATION FILED MAR12'9, 1917.

1,871,721 Patented Mar. 15, 1921.

8 F735. 2 AT RNEY' UNITED STA -Es "PATENT FF 'LEwrs c. IB'A-YLES, or 'EAs'r'oN, PENNSYLVANIA, ASSIGNOR T0 INGERsoLE-RAivn COMPANY, or JERSEY crrY, NEW JERSEY, A CORPORATION oE-EEwJEEs Y.

. EXHAUST-VALVE FOR HAMMER-DRILLS.

Specification of Letters Patent.

, Patented Mar. 15,1921.

7 Application filed March 29, 1917. Serial No. 15 8,-348.

To all whom it may concern:

Be it known that I,-Lnwrs C. BAYLES, 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 Improvementin Exhaust-Valves for Hammer-Drills, of which the following is a specification.

This invention relates to hammer drills, and in particular to a valve for controlling the exhaust port of such drills. r

The object of this invention is to improve the construction of the exhaust closing valve shown and described in my Patent No. 1,14%,991 granted July 6th, 1915.

A further object of this invention is to provide a simple valve which may be used haust valve for hammer drills has been clevised, a practical embodiment of which is shown in the accompanying drawings.

In the drawings annexed hereto and formin a part of this specification,

Iigure 1 shows an assembled view of a hammer drill with the improved exhaust controlling valve in place, Fi 2, a cross sectional view taken on the line II of Fig. 1.

Fig. 3, a cross sectional view on the lin IIIIII of Fig. 2, p

Fig. 4, a cross sectional view on the line IV-IV of Fig. 2, and

Fig. 5, a cross sectional View on the line V-V of Fig. 2.

In the construction shown 1 is the cylinder to which the valve chest 2 is secured by means of the studs 3. The main exhaust passes from the drill to atmosphere through a port in the boss 4 on the valve chest 2.

In order to remove the dust and rock outtings from the hole being drilled a small portion of the actuating fluid is permitted e. With these and other objects in view an exto escape from the cylinder 1 through the hollow drill steel 5 to the bottom of the hole. Under certain conditions of operationit is found to be very desirable toincrease the amount of the air passing through the drill steel-and at the same timereduce'the drilling power and fspeedof the hammer drillmore or less, while atother times it is desirable to continue 'thefiow of air through the hollowdrill steel while the hammer drill re. mains inoperative.

The restricting and closing of the exhaust port is accomplished in the present'invention by an improved form of valve constructed as shown. The port or bore in the boss 4 is made large enough to receive the body portion 6 of the valves preferably in the form of an open ended sleeve. The outer end of the valve 7 projects beyond the valve chest and is enlarged in diameter, the surface of which is knurled making it easy to grip and rotate by hand. The valve is further provided with a longitudinal hole 8 opening to the atmosphere at the outer end and with a lateral hole 9 passing through the side of the wall of the body 6 and communicating with the longitudinal hole 8.

In the position shown in Fig. 2 and Fig. 5 the exhaust is free to pass from the exhaust chamber 10 of the valve chest, through openings 9 and 8 to the atmosphere. A partial rotation of the valve to the left will reduce the size of the communication between 10 and 9 thus choking the exhaust, creating a back pressure in the cylinder, retarding the operation of the hammer drill and increasing the flow of motive fluid through the drill steel 5. A still further rotation of the valve will close the communication between 10 and 9, causing the hammer drill to cease operating but permitting the motive fluid to continue to flow from the cylinder hrough the drill steel to the bottom of the hole being drilled.

In order to secure the valve in thechest, a pin 11 is inserted in the chest 2 fitting in a groove 12 in the surface of the body 6 of the valve. This groove 12 preferably extends only partially around the circumferopening 9 registers Withthe exhaust recess 10 of the chest 2 and when rotated to the other extreme of its movement the opening 9 is out of register With the recess 10 and the exhaust is efleetivelyvclosed. i

A detent, compr sing a spring pressed pin 13 is preferably provided to hold the valve in open, closed, or partially closed position, as desired, a spring 14 serving to hold the end of the pin 13 pressed into slight depresa other forms and modifications are included Within the spiritand scope of the same as expressed in the appended claim.

What I claim is:

In an exhaust closing valve'for rock drills, the combination of a valve seat having a bore ported at right angles to its axis intermediatethe length of the bore, a sleeve ;open at both endsforming a valve revolubly mounted in the bore of said seat and having a port in said bore, manual operating means in the form of a knurled head connected to the sleeve and projecting beyond the seat for turning the valve, spring locking means lo- 'cated Within the Walls of the said seat and cooperating with the said head for loeking the valve in any predetermined position, and a pin andslot connectionbetween the sleeve and the seat for holding the valve in the said seat and for limiting the rotativemovement of the valve;

In testimony vvhereof, I have hereunto set my hand. J i p LEWIS BAYLES.

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