US1027061A - Automatic throttle-valve-locking mechanism for pneumatic tools. - Google Patents

Description

, R. A. NORLING. AUTOMATIC THROTTLE VALVE LOOKING Mnonamsm FOR PNEUMATIC TOOLS.

' APPLICATION FILED MAE-8. 1910.

1 ,O27,06 1 Patented May 21, 1912.

@WUWQY "UNIE STATES PATENT OFFICE.

REINH'OLD A, NORLING, OF AURORA, ILLINOIS, ASSIGNOR TO AURORA AUTOMATIC MACHINERY COMPANY, OF AURORA; ILLINOIS, A CORPORATION OI? ILLINOIS.

AUTOMATIC THROTTLE-VALVE-LOCKING MECHANISM FOR PNEUMATIC TOOLS.

Specification of Letters Patent.

Patented May 21,1912.

Application filed March 8, 1910. Serial No. 547,978.

act description therco't. reference being bad, to the accompanying drawings, and to the lettcrs of reference marked thereon. which form a part oil this specification.

'lhis invention relates to a portable pneumatic hammer or device of that class embracing a barrel or c 'linder; a piston or plunger adapted to slide therein, and a controlling valve through which the air or other fluid underpress'ure is admitted thereto and permitted to escape from the opposite end of the cylinder or barrel to give reciprocatory movement to the plunger tl'ierein. Air is supplied to the controlling valve by means of a throttle valve which is so located that it may be readily manipulated by the user of the hammer.

The invention relates to the means for operating the throttle valve and particularly to an automatic locking device which is adapted to lock said means in position to hold the throttle valve .in open position.

It consists of the combination of parts hereinafter described and more particularly pointed out. in the appended claim.

In the drawings:-.l*igurc l is a section through the handle end of a pneumatic hammer, taken on a plane containing the axis t' the handle and the axis of the throttle valve chamber. l ig. 2 is a partial section through Fig. 1 on the line 9-2 thereof. Fig. 3 is a similar section with the parts shown in a different position.

In the embodiment ot my invention illus trated in the drawings, A indicates the barrel or cylinder of the hammer; ll, the handle formed at the inner end thereof, and preferably integral therewith: the throttle valve chamber; D, the throttle valve stem; and I), the throttle valve disk. The supply end of the throttle valve chamber is provided with an internally screw-tln'eaded aperture into which is screwed a threaded nipple E provided with a fixed ring r: in which is formed an aperture e to act as a guide for the outer end of the valve stem.

parts are of the usual construction and require no further des(.=ription. The handle I and the barrel A are extended laterally to form parallel longitudinally extending ribs F," F which are separated by a slot or groove 7".

G indicates an operating lover or trigger which is pivoted at one end within the slot or groove f on a pin secured to the ribs I", ll. The valve stem Dprojccts between said ribs and is adapted to be engaged by a rounded projection 9 formed on the underside of the lever G. Said lever or trigger provided .at its tree end with a laterally extending thumb piece G. The opposite end of the lever is provided with a heel adapted to engage against the bottom of the slot f and limit the upward movement of the trigger. It is apparent: that by pressipg on the thumb piece G the valve D will be depressed and the valve disk D dislodged from its position against its seat D'-.

The ribs F, F are provided with circular holes or openings K, K arranged in line with each other and the rib F is provided with a second circular opening K parallcl to the common axis of the first two and above them. The side of the rib F is recessed to connect the outer ends of the holes K, K All of said holes open into the slot P. In the holes K, K is located the long member I of the J-shaped rod L and in the hole K is located the short member L of said rod. The curved member Z of the J- shaped rod lies in the recess connecting the openings K, K

The long member I of the bent rod L projects beyond the outer face of the rib F.

A cap M having a shank m, is secured to the end of said long member and the hole K is enlarged throughout a portion of its length, as indicated at In, to receive the inner end of said shank and also a coiled spring is which bears against 'thc inner end of said shank and normally holds said, J-shaped rod with the curved member Z lying within the recess 7.2 In this position. the beveled end I of the member If projects into the slot f and stands in the path of the lever or trigger G. Said trigger is provided with a hole or opening g which is so located that when the trigger is depressed, the axis of said opening will come into a position in line with the axis of the member L The operation of the improved locking device is as follows :-When the lever G is, depressed by the operator to open the throttle valve, the projection gon the lower edge of said lever strikes the beveled end of the member L and pushes it out of the way. As soon as the opening g comes into line with the projecting end of the member L the action-of the spring 76 causes said end to enter the hole 9 and thus lock the lever against upward movement, as illustrated in Fig 3, thereby maintaining the throttle valve in open position. When it is desired to close the throttle, the trigger G is released byfpressing against the cap M which withdraws the end of the member L from the openings and permits the trigger to rise and release the throttle valve.

The devicedescribed herein is of simple and economical construction and is readily adaptable to any hammer of the kind referred to. It relieves the workman of that muscular strain which is experienced in holding the throttle open by hand or finger pressure, which, owing to the variations of pressure, and the resultant vibration of the valve operating mechanism, in addition to the vibration of the tool as a whole, operates against the continuous use'of the hammer by the same workman'for long or extended periods of time.

While I ,have illustrated in the drawings one embodiment of my invention, it is to be understood that I do not limit myself to the details of construction shown and described herein exceptas pointed out in the appended cla ms, as it is apparent that said mechani -al details may be variously modified without departing from the spirit of my invention.

I claim as my invention In a pneumatic hammer, the combination with a barrel provided with a transversely arranged handle on the inner erid thereof 5 and with longitudinal, outwardly extending, parallel ribs located at one end of said handle, a normally closed throttle valve in said barrel for controlling the supply of pressure fluid thereto, said valve being located adja- '55 cent to said handle, a stem for said valve arranged transversely of the barrel and projecting outwardly therefrom into the space between said ribs, a hand-controlled lever pivotally mounted between said ribs and adapted to act on said stem to open said valve, said handle being provided with a hole extending transversely through the same and with a second hole extending through. one of said ribs, parallel with and outside of the first-named hole, a catch member consisting of a U-shaped rod having rigidly connected long and short legs mounted and adapted to slide in said holes, the

shorter leg being located in the outermost hole and being-provided with a beveled end which normally projects into the path of said lever; said lever being, provided with an opening adapted to be engaged by the beveled end of said shorter leg, and the said longer leg projecting laterally outside of the handle, and a spring adapted for yieldingly holding said catch member in position for engagement of its-shorter leg with said lever.

In testimony that I claim the foregoing as my invention I afiix my signature in the presence of two witnesses, this 25th day of February A. D. 1910.

' REINHOLD A. NORLING.

Witnesses:

CLARK EAGLETON, JAMES R. BRADSHAW.

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