US1594232A - Exhaust deflector - Google Patents

Description

July 27 9 1926.

EXHAUST DEFLECTOR Filed July 15, 1925 2 Sheets-Sheet 1 if J R T ll if J I a i 64 In, I

JNVENTOR. madam Zimmevmwn fl/SATTO NEY 1,594,232 w. F. ZIMMERMANN 1 942 w. F. ZIMMERMANN 32 EXHAUST DEFLECTOR Filed July 15, 1925 2 Sheets-Sheet 2 T If INVENTOR. 112311101111 Zimmfi'manl;

15 A NEYS.

Patented July 27, 1926.

NETE

WILLIAM FRANK ZIMIlEEItIIIANN, OF WAVEELTZ', NEW ASSIGNOBJ T0 TIEGER- SOLL-RAND COMPANY, OF JERSEY CTTY, NET-V JERSEEY, A CORPORATION OF NETV JERSEY.

EXHAUST DEFLECTOR.

Application filed July 15,

This invention relates to pneumatic hammer tools, but more particularly to the exhaust deflector disclosed in my co-pending application, Serial No. 18,656, filed March 27, 1925 for a pneumatic chipping hammer. The objects of the present invention are to improve upon the means for deflecting the exhaust from pneumatic tools and enable the exhaust deflector to be located between the cylinder and handle of the machine, but in a convenient and protected po sition.

The invention is illustrated in one of its preferred forms in the accompanying drawings, in which- Figu e 1 is a side elevation partly brohen away and in vertical section showing a chipping hammer provided with the exhaust de flector,

Figure 2 is a detail perspective view of the exhaust deflector, and

Figures 3 and 4 are diagrammatic longitudinal sectional views illustrating the operation of the machine.

Referring to the drawings, the cylinder or barrel A is formed with the bore 13 for the reciprocating hammer piston C having the neck D. Blows of impact are imparted to the chisel or tool E located at the front.

end of the cylinder. The rearward portion of the cylinder is provided with an enlarged bore F to receive the valve box G in the form of a hollow block, and also to receive the forward valve box cap H and the rearward valve box cap J. The handle K having the handle grip L is suitably secured to the barrel as by means of the bolts (l. The handle grip contains the throttle valve (not shown) controlled by the latch P for supplying pressure fluid to the machine.

The pressure fluid actuated distribution valve Q may be of any suitable type but is shown of the differential type and is located in the valve box G with its axis longitudinal. Pressure fluid is supplied to the machine from the supply passage R in the handle L and a main exhaust S is provided for the machine at a point located rearwardly of the valve. This main exhaust is conveniently located in the rearward valve box cap J and an exhaust deflector T i provided for this main exhaust between the handie and cylinder. The exhaust deflector T 1925. Serial No. 43,705.

as shown in Figure 2 is in the form of a sp it ring open at one side at 3 and the edges of the ring are preferably turned at an angle to term flanges 4;, so that the ring is of trough shape for conducting the exhaust to atmosphere through the space or opening left oetween the cylinder and back head indicated in Figure l. A portion of one flange, preferably opposite the open portion 3 is cut to form a tongue 5 which cooperates with notches 8 in the barrel for holding the deflector in a given adjusted radial position on a portion of the valve box, with reference to the longitudinal axis of the cylinder. The deflector is securely positioned between the cylinder and handle and is protected and not subject to derangement or loss.

The radius of the flllet 6 of the counter-- bore of the handle K is greater than the radiusof the corner 7 of the deflector T, so that when the handle is tightened to the barrel, the smaller radius 7 rides up on the fillet 6 and the deflector T is gripped and held in position by this means.

The supply of pressure fluid to both ends of the cylinder is controlled by the valve, and the main exhaust from the forward end of the cylinder through the exhaust passage lil is controlled by the piston G, and in addition to this main exhaust an auxiliary exliaust is provided from the front end of the cylinder through the passage V controlled by the valve Q. The exhaust from the rear end of the cylinder through the port TV passes through the valve Q itself to the main exhaust S and is controlled by the valve.

I The valve is thrown forward and held in forward position by live fluid pressure acting upon the shoulder of the enlarged head i of the valve, and the valve thrown to rearward position and held in said 1005i tion by live pressure fluid acting against the valve in a rearward direction and controlled by the neck D of the piston which co perates with the passage X in the cylinder.

The differential valve Q which is one type of valve which has been successfully used is preferably formed with the enlarged head Y and the neck Z, and the valve has an open rearward end a The enlarged head Y T011115? rearward shoulder hen the valve around the neck Z. and from thence to the rearward end of the cylinder through the 73 ports and passa es indicated for driving the piston forwar 'ihe rearwardly acting c of the enlarged head of to atmospheric presr in its forward posi- Figure 3 through the .'haus of the pist n and I: to the rearvvardly the valve will be actuheld in rearward posiion owing to tl e fact that the area 0 is argcr than the area b.

In the operation cit-the chipping hammer, let it be assumed that the piston is in its rear-most position as indicated in Figure 8 and the valve is in its forward position in which case live pressure luid admitted from the passage It in the handle will pass through the rearward valve box: cap J and through passages in the valve box around the neck Z of 12 valve and through a passage in tl forward valve box cap and the port W to the rearward end ofthe cylinder which will drive the piston forward. At the timethat the edge (Z at the front end of the piston covers the port 6 of the passage X. the dge 7 of the neck D will have uncovered the port 9 of the live pressure fluid supp passage T so that pressure fluid will flow around the neck I) of the piston and through the port it in the side of the cylinder con'nnunicating with the passage X leading to the'forward end of the valve so that the valve is then thrown rearwardly due to the differential areas of the valve.

As the valve is thrown rearwardly, live an fluid is supplied from the supply pa ll in the handle around the neck Z of the valve and through the supply passage V to the front end of the cylinder. -The piston, however, has sullicient momentum to strike its blow upon the chisel shank I 1 and commences its rearward motion before the pressure begins to build up in front of the piston to drive it rearwardly. This position of the parts is shown in Figure at. The rearward motion of the piston is due both to rebound and to live pressure fluid admitted as described.

Dur ng the rearward travel of the piston when 1e edge at the forward end ofthe piston uncoversthe port 6 of thepassag the exhaust 12.5

and the port j of the exhaust passage U, the edge 7 of the piston neck will have covered the ports g and it thus closing off the supply of live p"essure fluid to the rearwardl acting PIQSSLI'Q surface 0 of the valve and the forward end of the valve will thus be open to exhaust hrough the passage X and 1 age U. At this time the ssure 'iuid on the forwardly acting face 5 of the valve head or shoulder will hrow the valve forwardly to the position indicated in Figure 3 and open y exhaust for the front end of Yer through tlc passage V and over the rearward end of the valve to the main exhaust S. Before this occurs howtie exhaust from the rein'wz d end of he cylinder as the piston traveling rearl passes out through the port W and der, an exhaust deflector in said counterbore in the form of a split rin open at one side the edges of the ring being bent inwardly at an angle the radius of the fillet of the counterbore being greater than the radius of the bend of the cooperating corner of the deflector, whereby the deflector is gripped tightly in the counter-bore when the handle is tigl'itened to the cylinder.

2. In a pneumatic hammer tool, the combination of a cylinder and reciprocating piston, a handle having a fineted counterbore, means for connecting the handle to the cylinder, an exhaust deflect r in said counterbore in the-form of a split ring open at one side, the edges of the ring being bent inwardly at an angl the radius of the fillet of the count-erbore being greater than the radius of the bend of the cooperating corner of specification.

WILLIAM- FRANK ZIMMERMANN.

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