US1086413A - Pressure-reducing valve for air-feed drills. - Google Patents

Description

' A. mun-0R & L. 0. BAYLES. PBESSUBBYBBPUGING VALVE FOR AIR FEED DRILLS. Ar'rtioluron 11.21) MAR. 20, 1912.

Patented Feb. 10, 1914. ]I[ J Fig. 2. 12 11 A TTORNEY ing is a specification. v

This invention relates to a pressure re- UNITED STACFES PATENT oFFIoE;

ALBERT I-I. TAYLOR ANDLEWIS c. BAYLES, or nAsroiv. PENNSYLVANIA, AssIqNoRs T0 INGERSOLL-BAND COMPANY. or NEW YORK, N..Y. A CORPORATION 0F NEW JERSEY.

PRESSURE-REDUCING VALVE ron AIR-FEED nniLLs.

To all whom it may concern Be it known that We. ALBERT ll. TAYLOR and LEWIS C. Barnes, citizens of the United States, residing-at Easton, 1n the-county of Northampton and State of Pennsylvania,- have invented certain new andu ser'ul lin- ')rovements in Pressure-Reducing Valves for Air-Feed Drills, of which the follo vducing device for use with air feed fluid Drills of this kind'consist piston in a cylinder in line with the drill, the air pressure being taken direct from the supply pipeoperating-the drill. In such a machine the force with which the drill is fed is dependent on the diameter of thepiston in the feeding cylinder. .II" this piston is sufficiently large to properly support the drill when boring a vertical ,"up hole as in the roof of ajsto'pe, there Will be a large excesspressure when boring a horizontal or flat hole, and a still greater excess pressure in boring a down hole. Also ifthe same directionv is maintained and the air' pressure varied the drill Will be fed forward various less stringent conditions.

with difierent force. Onac'co-unt of this'difference in feeding power required; it is necessary for a. given type of drill to build] difierentsizes of air feeds, and to supply various difierent sizes for various conditions. The object of this invention is to prov de a valve between the main feed supply andthe air feed cylinder which can be adjusted to reduce the pressure in the air feed for A I l the feed cylinder leads to the-back of the valve ton elearancc which maintained a drill is furnished with cylinder sul'licientl i large to meet the mostdifficult case, the feedcan be ad usted down to adapt it t We are aware that reducing known Where the pressure of t' livered to the air feed is va tion to the fluid furnished to t i do not contemplate a device o1: however. in the present device. A will. maintain a jllFEILPl'tbSlll'il in teed cylinder re of the pr the air sup niding this exec pressure for i; the valve is set.

l ith this object in view. we ha devised x a valve a practical euihothnient of which is Specification of Letters Patent. Patented Feb. 1D, 1914; Application filed March 20,1912. SerialNo. 68?,106. I?

shown in' the accompanying dravvings in Figure l is an elevation of the complete yalve section lookin rom thea r fetid 6X 'inderside.

' In the embodiment shown in the draw in'gs, the complete drilling machine com.-

prises a separate disk like -valve"seetion 1 which is ofsueh ator n as to lit, and be secured byholts 2 through bolt holes 3 between the head block 4: of ,a'usual formof drill provided with a usual air inlet 5, and the head I a pressure reducing valve is not desired.

The valve chest 1 is pierced in a diametral direction by a cylindrical bore 8 with a slightly contracted portion in whichis seated the spool valve 9 so that it can slide freely 59 either direction. The-spool valve f9 has acontracted portlonrlO-whlch is al ways in 7 communication with a port 11.

which "is in free con'imunication .with the port-l2 leading from the in-let5. vFrom the other side of the bore at such a point that'it will he closed by slight movement of the spool valve O'is a port 13 lcadinginto the air feed cylinder 6. A second poi-F14 from all times by a lmss 15 on a nut 16, Which is .hrcadcd mm the end of valve bore 8. On

5 the other side of the spoc-lfvalve isfa'sprlng.

'hich. 'uesses the valve toward the at fjltudluul grooves inthe bore and actuated hv. a threaded spindle 20. mounted to turn 1 freely in a nut 21. threaded in the end of l the valve bore.

' 3 its j vent port 23 lead from the bore 8 just inl ide the nut 21. to the atmosphere;

The operation of the valve is are-follows:- Fiunpmc the valve spool to be in the posi- The spindle is provided on outer end with a thumb screw 229 1;

v v vertical sectionthrough thevalve on the line 'IIII of Fig. at. Fig. 3

and is ZHllHsELtlDl'V compressed by a pluml5 pim-ided Wl'tll lugs 19 sliding in lontion shown in Fig. 2 which will be the case l when the air pressure is not on in the drill. When the air is now turned on, it will pass through ports 12, 11, 13 into the air feed cylinder. Since the clearance back of the valve spool is open to the feed cylinder pressure through port l4=, and the'bore 8. on l the other side of-the spool is open to the atmosphere through port 23, there will be a l fluid pressure on the back of the spool tend- F ing-to close the port 13, which pressure is l balanced by the pressure of the spring 17 on the other side of the spool \valve. When the f pressure on the back of-the spool reaches a certain point it will overcome the pressure of the spring and close the port 13. -This 5 point of closingis determined by the com pression of the spring 17' which can bej changed by adjusting the position of plun- 9 ger 18. Itwill- .be seen, therefore, that, the spring-17 can be adjusted for any desired pressure int-he air" feed cylinder and this l will be maintained as long as the pressure in the drill is above this desired pressure. j

It is to be understood that the present disclosure shows only one embodiment and} changed and modified forms of the device are considered within the sgirit-and scopeset of our invention as expres \Vhat we claim-is:

1. In combination, a fluid operatedgdmll in the claims.

having a head block, an air feed cylinder forsaid drill having a head block adapted to fit ders of an air feed drill 3. As an article of manufacture, a valve chest of disk like form containing a pressure. reducing "alve, -said valvechest being adapt. t ed to be secured between the drill and air feed cylinders of; anair feed drill.

ALBERT H..TAYLOR. LEWIS C. BAYLES. WVitnesses G. D; PA'rrERsoN, H; D. MAXWELL.

Copies of this patent may "be obtained for five cents each, by, addressing the Commissioner of Patents; Washington, D. 0.

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