US1609502A - Fluid-actuated hammer tool - Google Patents

Description

Dec. 7 1926.

. vF. H. THOMAS FLUID ACTUATED HAMMER TOOL 2 Sheeis-Sheet 1 Filed June 20, 1925 INVENTOR.

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Patented Dec. 7, 1926.

- UNITED STATES PATENT oil-Pica;

FLOYD H. THOMAS, 015 MILAN, PENNSYLVANIA, ASSIGNOR 1'0 INGERSOLL-RAND GOM- OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY. I

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' application filed June 20, 1925. Serial No. 38,435.

' This invention relates'fto fluid actuated hammer tools in which the implement to' which blows of impact are imparted by the reciprocating hammer may be of any desired form. The machine may be a sand rammer, coal pick, rock drill, or of some other type, in which the pressure fluid is controlled by a distributing valve or valves,

but in the resent instance the particular type of machine to which this invention relates has a main piston controlled. exhaust, an inlet valve, and a compression relief valve controlling auxiliary exhaust ports.

The objects of the invention are to construct both the inlet and compression relief valves in a simple manner and enable both valves to be located in compact and easil accessible form ina convenient position wit relation to the cylinder, preferably in a valve box at the rear end of the cylinder.

between the cylinder and back head, although the location may be varied'as desired.

Another ob'ect' of the invention is to make the mac ine easy to hold during operation.

To these ends the invention is shown in one of its preferred forms in the accompanying drawings, in which Figure 1 is a longitudinal sectional elevation of so much of a fluid actuated hammer tool as will serve to illustrate the invention, this view being taken on the line 1-1 of Figure 2 looking in the direction of the arrows,

Figure 2 is a transverse top plan view on the line 2-2 of Figure 1 looking in the direction of the arrows,

Figure 3 is an enlarged sectional elevation taken on the line 3-3 10f Figure 2 looking in the direction of the arrows with the exception that the valves have oscillated so that the piston is moving rearwardly' instead of forwardly as shown in Figure 1.

Figure 4 is a sectional elevation. taken through the inlet valve on the line 4-4 of Figure 2 looking in the direction of the arrows,

Figure through the compression relief valve on the line 5-5 of Figure 2 looking in the direction of the arrows,

Figures 6 and 7 are views similar to Figures 4 and 5 with the valves and piston in 5 is a sectional elevation taken a different position corresponding to the position shown in Figure 3, and Y Figures 8 and 9 are similar views showing a different position of the parts Referring to the drawings, the cylinder A is provided with the piston B having the head C and the forward extending shank Il.) adapted to impart blows of impact to the shank E of a suitable implement. Pressure fluid, as for instance, compressed air, is supplied through the supply passage F in the back head G and themain exhaust H of the cylinder is in this instance controlled by thepiston.

A supply passage J for fluid under pres- I sure communicates at the ort K with the forward end of the cylin er and suitable means are provided in accordance withthis invention for controlling the distribution of pressure fluid to both the rearward and forward ends of the cylinder.

In the present instance, a valve box'comprising the plate or block L, the separator or spacer O and the cover P is located between the cylinder A and the back head G, and the inletvalve Q and the compression relief valve R are located in this valve box.

The valve box plate L is formed with the inlet port S communicating with the inlet passa e J leading to the forward end of the cylin er and is also provided with the inlet port T leading to the rearward end of the cylinder; The valve box plate L is also provided with-the ports U and V which act as auxiliary exhaust ports. The ports S and U are connected by a cross passa e W and the ports T and V are connected by a cross passage X and these cross passages as shown are in the form of grooves milled or otherwise cut in the plate L and they are covered over by the solid central portion Y of the separator plate O'of the valve ox. The separator or spacer plate 0 of the valve box is suitably formed in this instance with rectangular valve chambers a and b in which oscillating valves Q and R are located. These valves may be in the form of rectangular plates tapering substantially uniformly in each direction from the median or central portions so that they will rock or oscillate and they may be provided pins e extend.

The valve box cover P is formed with the inlet ports f and f controlled by the'inlet valve Q. and two auxiliary exhaust ports g and h communicating with the atmosphere preferably at opposite ends of a diameter of the valve box cover P and these auxiliary exhaust ports or compression relief ports g and h are controlled by the compression relief valve R as it oscillates. Since the passage J in the cylinder of the machine communicates by means of the cross passage W In the operation of the machine, let it be assumed that the piston is moving on its forward stroke as indicated in Figures :1, 2, 4

and 5. As the piston was starting andbefore it reached and covered the free exhaust port H the forward end of the cylinder was at atmospheric pressure and conse uently there was atmospheric pressure un er the opposite end of the inlet valve Q, through the passage J and; port S. After the piston has covered the free exhaust H compression in the forward end of the cylinder is relieved through the passage J, port S, cross passage W, port U and thence out through the auxlliary exhaust through the end of the compression relie valve R which is in the position indicated in Figure 5 since pressure fluid under working pressure in the rear end of the cylinder maintains the compresion relief valve R in the position closing the opposite auxiliary exhaust h.

When the piston overruns the free exhaust H as indicated in Figures 6 and 7, the ressure in the rearward end of the c lin er is dropped and the live pressure flui through the inlet port 7 in the valve box on top of the inlet valve Q in combinationwith the slight compression in the front end of the cylinder exerted upon the under side of the valve Q through the port S rocks the valve to close the cylinder inlet port T and open the port S communicatin by the passage J with the forward end of t e cylinder so' that the piston starts on its rearward. travel. At the same time live pressure fluid is admitted through the inlet port S, cross passage W and port U to the under side of the com res- 'sion relief valve R at one end thus oscillate cylinder a I valve box centrally in line with the cyl'nden at its rearward end and having valve chamhers located side by side valve seats in said chambcrsarranged in substantially the same plane transverse to the axis of the cylinder, a valve box cover, two separate oscillating plate valves located side by side in substantially the same plane in said valve box'chambers, one an inlet valve and the other an.

auxiliary exhaust valve, inlet ports for both ends of the cylinder inthe valve seat of one valve box chamber controlled by the inlet valve, separate auxiliary exhaust ports in the valve box cover controlled by the auxiliary exhaust valve, and cross passages in the valve box connecting the said inlet ports with said auxiliary exhaust ports. I

2. In a fluid actuated hammer tool, the combination of a cylinder and piston, a main piston controlled exhaust for the cylinder, a

at its rearward end, said valve box including a valve block and a cover, valve chambers located side by side in the said block, valve seats in said chambers arranged in substanof the cylinder, two separate oscillating plate valves located side by side in substantlally the same plane in saidvalve box chambers, one an inlet valve and the other an auxiliary exhaust valve, inlet ports for both ends of the cylinder in the valve seats of one valve valve box centrally in line with the cylinder tially the same plane transverse to the axis box chamber controlled by the inlet valve, 7

separate diametrically opposite auxiliary exhaust. ports in the valve box cover controlled by the auxiliary exhaust valve, and cross 7 passages wholly in the said valve block connecting's'aid inlet ports with the respective" auxiliary exhaust ports for each end ofthe cylinder.

In testimony whereof I have signed this I specification. j I

a 1- FLQYD H. THOMAS.

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