US1572371A - Combined throttle and governor for pneumatic tools - Google Patents

Description

Feb. 9 1926.

1,572-5371 w. A. sMrrH COMBINED THROT-TLE AND GOVERNOR FOR PNEUMATIC TOOLS Filed July 25. 1921 2 Sheets-Sheet l W. A. SMITH COMBINED THROTTLE AND GOVERNOR FOR PNEUMATIC TOOLS Feb. 9 1926 2 4sheets-smet 2 Filed July 25 1921 se, Mmm /hw/f/m HSM Patented F eb. 9, 1926.

UNITED STATESv A WILLIAMA. SMITH, oF DETRoI-T, MICHIGAN, AssIGNoR To PATENT OFFICE."

CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., CORPORATION OF NEW JERSEY.

COMBINED THROTTLE AND GOVERNOR FOR PNEUMATIC TOOLS.

Application led July 25, 1921. Serial No. 487,375.

To all whom t may concern.'

Be it known that I, WILLIAM A. SMITH, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements inCombined Throttles and Governors for Pneumatic Tools, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to pneumatic tools of that type in which a reciprocating percussive mechanism is combined with a separate motor for rotating the tool and the invention consists in the means for automatically governing the rotary motor and in the peculiar construction and arrangement of parts as hereinafter set forth.

In theA drawings:

Figure 1 is a central longitudinal section through the tool;

Figure 2 is a fragmentary sectional view taken in a different plane;

Figure 3 is a cross-section on line 3-3 of Figure 1;

Figure 4 is a cross-section in the plane of the throttle valve oniline 4 4 ofFigure 1;

Figure 5 is a similar viewshowing the ports and passages diagrammatically;

Figure 6 is a section through the ball valve on the line 6 6 of Figure 5.

Heretofore constructions have been devised in which an automatic valve is located in the conduit between the throttle and the motor and is actuated by back pressure from the motor to vary the opening. With the present invention the govermng valve is located directly within the'throttle, thereby simplifying the construction.

In detail, A is a barrel or cylinder of a percussive motor of any suitable construction, containing the reciprocating piston B. C is the anvil for receiving the impact of the piston, D the tool and E a revoluble sleeve or tool holder which is driven by a peripheral gear F Aintermeshing with the pinion G on a shaft H revolved by the rotary motor I, preferably of the gear type throu h the medium of the motor shaft I' and t e reduction gears I2 and Ia (Fig. 3).

The 'compressed air or other motive fluid, while operating both the percussivemotor and the rotary motor, is supplied through a connection J, and K is a throttle valve vided with anannular cham U engaging correspondin for controlling the supply. The valve'K .is preferably of the hol ow plug type havlng one end in communication with the Huid supply and being also provided with ports L and M for registration respectively with npassages O and P leading to the reciprocatory and rotary motors. the plug through the medium of a suitable handle, the fluid is turned on or off simultaneously with res ect to both motors.

For governing t e rotary motor it is essential to cut down the quantity of fluid supply when the motor is idling and to increase the quantit is effected y means of a valve placed within the hollow plug K, .said valve (being forced towards its seat by the pressure of the fluid supply and away"from its lseat by the back pressure from the rotary motor. As preferably constructed, a ball valve R is placed within the plug K adjacent toa seat S and is retained in this position by 'a perforated stop member T. Theplug K 1s of conical form and at the small end of this cone is an adjustable stop in'U which may be set to hold the ball omits seat .any amount desired. The lug K is proer S adjacent to the's'eat S and the longitudinal grooves S2 which allow the fluid pressure to pass by the. ball R when it is Withheld from its seat. The pin U has a threaded portion threads in the ,plug with a polygonal hea U2 at the outer end and a lock nut U3 for holding it in any position of adjustment. A spring V is sleeved upon the pin U and cooperates with the back ressure from the rotary motor to force the ball away from its seat. The casing W for the valve is preferably formed integral with the casing W for the rota motor. The valve K is inserted throng one end of this casing and the nipple connection J is attached -to this end by a cap or gland X. The spring Y engaging a coun-A terbore in the nipple J and bearing against the end of the valve serves to yieldably force the latter against its seat In operation, the pin U is adjusted so that the ball -valve R will be displaced a sufficient amount from its seat to furnishv the air `necessary for running the rotary motor without load. The pressure of the fluid supply on the opposite side of the valve R will normally hold the latter against 110 Thus by rotating in proportion to the load. This Aspring f trolling the pin will shift said valve away from its seat, admitting a larger quantity et air to the rotar motor. 'ihus the valve R will automatically chan e its position aoeorchI ing to load to sappy the requisite amount ci fluid.

Ey placing the automa-tie governing val-ve within the throttie, a'mnch more compact arrangement is obtained as 'well es asimpiie construction.

il'hat l claim as my invention is: I

L The combination with a percussive and a rotary motor, of a throttle valve orsupplying duid to each automatic governin valve for the rotary motor -within said t rottle valve.

2. The combination with a percussive and a `rotary motor, oi a throttle valve or contle iiuid suppl to each of said motors, a governing va ve for the rotary motor within said throttle valve arranged to be' forced towards its seat by the presa rotary motor,

sure of iluid supply and away from its seat by back pressure lfrom the rotary motor, and an adjustable stop for holding said valve from its seat.`

3. The combination with a percussive'and a rotary motor, of trolling the fluid suppl to each of sai motors, said valve being ollow, a ball valve within the hollow of said throttle valve, a seat towards which said ball valve is orced by the pressure of the fluid supply, a stop adjustable to hold said ball valve a varying distance from its seat, and a spring cooperating with the back pressure against said valve for forcing the same away from its seat a ainst the pressure of the supply iiuid.

4. 'ghe combination with a percussive and of a throttle valve for controlling the same comprising a hollow conical lug, means for supplying the motive iiui to the chamber wit in said plug, a ball valve within said chamber, a seat or said valve towards which it is forced by the pressure of the iiuid supply, a stop pin arranged axially within said throttle. valve and adjustable to hold said ball valve a varying distance from its seat, and a spring sleeved upon said pin bearing against said valve and cooperating with the back pressure from the rotary motor to force said valvefrom its seat.

5. The lcombination with a percussive and a rotary motor, of a throttle valve for controlling the same comprising a hollow conical plug', means at the large end of said plug for connecting, the fluid supply thereto, ports in said plug cooper-ating with registering ports said plug valve of said motors, and an a .throttle valve for con` d holdin y 'abrasivi for controlling the supply to the percussive and to the rotary motors, a ball valve in the chamber within said plug, aseat forsaid ball valve intermediate the ports forv the percussive and the rotary motors, a stop pin extendin axially into rom thesma l end thereof, said pin having a threaded portion rotatively adjustablel to force said ball valve from its seat, and a spring sleeved upon said pin and bearing against said ball valve to cooperate with the back pressure from the rotary motor and forcing said bail from its sean 'ihe combination with a percussive and y' motor, et a throttle valve 'tor cor,-

ifiuid supply te eaeh of said motors, a governing vaive tor the rotary motor within said throttle valve, and astop ortholding said governing valve from its sea 7. lhe combination with a percussive and a rotary motor, oa throttlevalve tor controlling the fluid to each governing valve within said throttle valve arranged to be forced towards its seat by the pressure of duid suppl and a stop for holdin said governing va ve from its seat.

8. T e combination with a percussive and a rotary motor, of a throttlevalve for controlling the fluid supply, a governing valve within said throttle valve arranged to be forced towards its seat by the pressure of fluid supply, and an adjustable stop for sai vgoverning valve a variable distance rom its seat.

9. The combination with a plurality of motors, of a throttle valve for supplying iiuid to veach of'said motors, and an automatic governing valve for one of the motors within said throttle valve.

10. The combination with a plurality of motors, of a throttle valve for supplying fluid to each of said motors, and means in said throttle valve responsive to back pressure from one of said motors for varying the supply of fluid to said motor.

11. A. valve` adapted simultaneously to control the supply of motive fluid to a plurality Vof motors, said valve having means responsive to back pressure from one of the motors for varying that motor, said means permitting passage of a predetermined amount of iiuid when said motor is unloaded.

12. A valve adapted simultaneously to control the supply of motive fluid to a pluraility of motors, said valve having means in the form of a governing valve arranged automatically to vary the supply of iiuid to one motor in response to back pressure therefrom, said governing valve permitting a limited flow of fluid when its. motor is unloaded, and means foradjusting said governing valve to increase or decrease the flow of said motors, a`

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the supply of fluid to c its seat against the thrust :maar: f

of Huid thereby during the unloaded condition of its motor. f a

13. A throttle valve adapted for the simultaneous control of a pair of fluid pressure operated motors,V and having means differentiating 'automatically the fluid pressure supply to said motors in response to back pressure from one of said motors.

14. A valve adapted simultaneously to control the supply of motive fluid to a pair of motors, said valve having -an automatic governing valve controlling the fluid supply to one of the motors, an adjustable Sto arranged to hold said last-named valve og of the motive fiuid thereby normally to admit fluid in predetermined amount to its motor, said last-named valve operating automatically ih response to an increase 1n back pressure from its motor to motive fluid thereto.

15. A valve adapted simultaneously to control the .supply of motive iluid to a pair of motors, a governin valve therewithin forced toward its seat y the motive fluid, said governing valve contro the supply of fluid to one motor, an adjustable stop holding said overn` valve from its seat to admit lui in p etermined amount to its motor, Said governing valve being responsive to an increase in back pressure increase the supply of from its motor to increase the amount of fluid supplied thereto, and resilient'means engaging said governinglvalve and continuously tending to fonce t said stop.-

In testimony whereof I alix my si ature. WILLIAM A. SLHelH.

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