US2108947A - Hydraulic motor for deep-boring mechanisms - Google Patents

Description

Feb. 22, 1938.

T. SEIFER HYDRAULIC MOTOR FOR DEEP BORING MECHANSMS Filed NOV. 26, 1935 2 sheets-sheet 1 Feb. 22, 1938. T. sElFER HYDRAULIC MOTOR FOR DEEP BORING MECHANISMS Filed NOV. 26, 1935 2 Sheets-She@- 2 J @nm Patented Feb. 22, 1938 PATENT OFFICE HYDRAULIC MOTOR. FOR DEEP-BORING MECHANISMS Theo Seifer, Berlin, Germany Application November 26, 1935, serial No. 51,633 In Germany February 27, 1935 9 Claims.

taking place when the auxiliary valve is opened or closed.

The main valve is according to not only released from pressure but may also be protected against the concussions of moving Water, because a small span of time intervenes between the closure of one valve and that of the other, the cylinder already rising in the meantime and being charged with water, (provided that the dimensions are correspondingly chosen).

Referring now to the drawings which are for illustrative purposes only,

Fig. 1 is a vertical cross-section through a part of the cylinder, the latter being in its highest position.

Fig. 2 shows the same parts a's Fig. 1, with the cylinder in its lowest position.

Fig. 3 illustrates another modification.

Fig. 4 shows the valve according to Fig. 3, the cylinder assuming its lowest position.

Fig. 5 illustrates a complete boring mechanism including the chisel.

In Fig. 1, a is the hollow boring tubing through which the `flushing and driving water is introduced into the cylinder. b is the cylinder of the hydraulic motor which is firmly connected lwith the chisel and in which the piston d may slide. The piston d is xed to the tubing The piston divides the interior of the cylinder into two chambers. e are openings in the tubing a through which the ushing water` enters the upper chamber of the cylinder. f1 and fz are ducts through which the flushing water is transferred to the lower chamber of the cylinder b. The tubing a is widened beneath the piston d to form a chamber in which the main valve gz and the secondary valve g1 are arranged. The

valve g1 is firmly connected to the valve rod h1 on which a collar i is provided. A c I inder l closed by a bottom m is concentrically c nnected with the cylinder b. In the bottom m ducts for leading the water to the chisel are provided. At

l its upper and lower` end the cylinder l is equipped my invention with collar-like enlargements n. At the lower end of the tubing a, levers o1 and o2 are fulcrumed cooperating with the rest i and sliding with rolls q on the outer surface of the cylinder l. T1, T2, T3 are controlling springs of which r1 rests on the control rod h2. s is a bore in the valve g2.

When the valves gi and g2 are closed the water ows from the tubing a into the interior of the cylinder b above the piston d (position'shown in Fig. 2). The cylinder is lifted together with the chisel (Fig. 5). It pushes upwards the rod h2 which strikes upon the lower end of the rod h1. On further raising the cylinder b the spring n is more and more compressed, the levers o1 resting on the upper side of the collar i. As soon as the .lower enlargement n of the cylinder l reaches the rolls q, the latter are displaced aside and the collar i is released from the levers o1. Now the compressed spring r1 may open the valve g1 so that the water is allowed to flow olf from the chamber formed above the valve y1.

The valve g2 was hitherto pressed upwards against its seat, its lower surface being greater than its upper surface. The hydraulic pressure cf the water was, during this period, assisted' by the spring r3. After the valve g1 is opened a hydraulic pressure acts upon the upper surface of the valve gz, the bore s letting less water flow 01T than the quantity of water flowing in through the tubing a. After opening the valve g2 the ushing water flows off rapidly through the ports f1 down to the chisel and the cylinder sinks down under the action of its own weight. The

rolls q again roll off on the middle part of the .a cylinder l, the levers 01 taking a position beneath the collar z' and keeping the Valve g1 opened even when the compression of the spring rl ceases. This position of the levers and valves is illustrated in'Fig. 1 in which the rests of the levers 01 are shown lying under the collar i. The valve y1 is closed only when the rolls g roll upon l the upper enlargement of the cylinder l and the levers oi again release the collar i whereupon the hydraulic pressure again acts on the lower surface of the valve gz that is now likewise closed.

In Figs. 3 and 4 the surfaces of the valve chamber which are touched by the surfaces of the valves when closed are in another position than in the modification shown in Figs. 1 and 2.

In4 Figs. 3 and 4, a is the hollow tubing, b the cylinder sliding on the piston d. e is an opening in the tubing a through which the iiushing water is introduced into the cylinder above the piston. f1 and f2 are openings through which the ilushing water flows from the interior of the tubing a beneath the piston d into the cylinder b.

' g1 is the auxiliary valve and yz the main valve. h1 and 'hz are the two parts of the valve rod. Part h1 is provided with a` collar i. l is a cylinder connected with cylinder b and provided Y valve g1 is closed by the valve rod hi, h2 and the Vspring T1 when the cylinder has been raised. Now the valve yz is thrown upwards because the lower surface is greater than the upper one. The flushing water now largely runs out and the cylinder drops down. Hereby the spring r1 is released and in the corresponding relative position o f Athe roll q and the cylinder the valve g1 Yis pressed downwards and opened by the hydraulic pressure andY under the action oiA the spring r2 so that now the water pressure beneath vthe valve 9': is reduced and the valve y2 is closed,

whereupon the cylinderis again lraised'.

By dividing the valve rod into two sections h1 and h2 it is possible to insert any desired free play between the lowest position of the cylinder and its position in the moment when the compression of the spring r1 begins.

As shown in Fig. 4, the valve g2 may be shaped to form a solid body, in which case the duct s` may be formed by a cavity in the wall of 'the tubing connecting the space beneath the valve gz with the space above this valve. r3 is a closing spring'in Figs. 1 and 2 and an opening spring in Fig. 3.

I claim 1. In a boring mechanism, the combination of a tubing through which the flushing `iiuid flows, a piston on the said tubing, a cylinder sliding over the piston, a main valve in the said tubing, a chamber in the tubing beneath the valve seat, apertures being provided in the said chamber for the discharge of the iiushing iiuid, an auxiliary valve in the said chamber, a rod extending from the body of the auxiliary valve and a second rod adapted to be lifted with the cylinder and adapted to strike the rst named rod thereby opening the auxiliary valve after the cylinder has passed a certain way from its lowest position, the main valve being actuated by the variations of the hydraulic pressure connected with the opening and closing of the auxiliaryvalve.

2. In an impact boring mechanism actuated by flushing iiuid the combination c-f a tubing, a. piston mounted thereon, a cylinder slidably mounted on said piston, a boring tool carried byv said cylinder and valve means for reversing the flow of lluid to said cylinder to cause reciprocation thereof, said valve means comprising a main valve 4and an auxiliary' valve in said tubing, a chamber adapted to be closed by the main valve, a second chamber beneath the rst one adapted to be closed by the auxiliary valve both chambers being provided with outlet ducts, a rod extending from the body of the auxiliary valve and adapted to be lifted by the cylinder to open the auxiliary valve after the cylinder has passed a certain way from its lowest position, the main valve being controlled by the variation of the hydraulic pressure in connection with the opening and closing of the auxiliary valve. I

3. In an impact boring mechanism actuated by flushing fluid the combination of a tubing, a piston mounted thereon, a cylinder slidably mounted on said piston, a boring tool carried by said cylinder and valve means for reversing the iiow of fluid to said cylinderto cause reciprocation thereof, said valve means comprising a main valve in the said tubing provided with an axial bore of a diameter smaller than the inner diameter of the tubing, an auxiliary valve in the tubing beneath the main valve, a chamber adapted to be closed by the main valve, a second chamber beneath the iirst one adapted to be closed by the auxiliary valve both chambers being provided with outlet ducts, the main valve being controlled by the variation of the hydraulic pressure in connection with the opening and closing of the auxiliary valve.

. 4. In an impact boring mechanism actuated by ushing iiuid the combination of a tubing, a piston ymounted thereon, a cylinder slidably mounted on said piston, a boringl tool carried by said cylinder and valve means for reversing the ilow of fluid to said cylinder to cause reciprocation thereof, said valve means comprising a main Valve in the said tubing the body of which has a lower surface greater 'than its upper surface, an auxiliary valve in the tubing beneath the main valve, a chamber adapted to be closed by the main valve, a second chamber beneath the iirst one adapted to be closedY by the auxiliary valve both chambers being provided with outlet ducts, the main valve being controlled by the variation of the hydraulic pressure in connection with the opening and closing of the auxiliary valve.

5. In an impact boring mechanism actuated by flushing iiuid the combination of a tubing, a piston mounted thereon, a cylinder slidably mounted on said piston, a boring tool carried by said cylinder and valve means for reversing the flow of uid to said cylinder to cause reciprocation thereof, said valve means comprising a main valve in the said tubing the body of which is provided with an axial bore of a diameter smaller than the inner diameter of the tubing and has a lower surface greater than its upper surface, an auxiliary valve in the tubing beneath the main valve, a chambenadapted to be closed by the main valve,

a second chamber beneath the rst one adapted to be closed by the auxiliary valve both chambers being provided with outlet ducts, the main valve being controlled by the variation of the hydraulic pressure in connection with the opening and closing of the auxiliary valve.

6. In an impact boring mechanism actuated by iiushing fluid the combination of a tubing, a piston mounted thereon, a cylinder slidably mounted on said piston, a boring tool carried by said cylinder and valve means for reversing the flow of uid to said cylinder t`o cause reciprocation thereof, said valve means comprisinga main valve in the said tubing adapted to control the motor and provided with a spring actuating the said valve, and an auxiliary valve in the tubing beneath the main valve, a chamber adapted to be closed by the main valve, a second chamber beneath the first one adapted to be closed by the auxiliary valve both chambers being provided with outlet* ducts, a rod extending from the body of the auxiliary valve and adapted to be lifted by the cylinder to open the auxiliary valve after the cylinder has passed a certain way from its lowest position, the main valve being controlled by theA the said valve, and an auxiliary valve in the tubing beneath the main valve,4 a chamber adapted to be closed by the main valve, a. second chamber beneath the first one adapted to be closed by the auxiliary valve both chambers being provided with outlet ducts, a rod extending from the body of the auxiliary valve and adapted to be lifted by the cylinder to open the auxiliary valve after the cylinder has passed a certain way from its lowest position, the main valve being controlled by the variation of the hydraulic pressure in connection with the opening and closing of the-auxiliary valve.

8. In an impact boring mechanism actuated by flushing uld the combination of a tubing, a piston mounted thereon, a cylinder slidably mounted on said piston, a boring tool carried by said cylinder and valve means for reversing the ow of fluid to said cylinder to cause reciprocation thereof, said valve means comprising a main valve in .the said tubing adapted to control the motor and provided with a spring adapted to close the said valve, and an auxiliary valve in the tubing bea cylinder slidably neath the main valve, a chamber adapted to be closed by the main valve. a second chamber beneath the first one adapted to be closed by the auxiliary valve both chambers being provided4 with outlet ducts, a rod extending from the body of the auxiliary valve and adapted to be lifted by the cylinder to open the auxiliary valve after the cylinder has passed a certain way from its lowest position, the main valve being controlled by the variation oi the hydraulic pressure inconnection with the opening and closing of the auxiliary valve.

9. In an impact boring mechanism actuated by flushing uid the combination of a tubing, a piston mounted thereon, a cylinder slidably mounted on said piston, a boring tool carried by said cylinder and valve means for reversing the ow of fluid to said cylinder to cause reciprocation thereof, said valve means comprising a main valve in the said tubing adapted to control the motor and provided with a,v spring. adapted to open and to close the said valve, and an auxiliary valve in the tubing beneath the main valve, a chamber adapted to be closed by the main valve, a second chamber beneath-the rst one adapted to be closed by the auxiliary valve both chambers being provided with outlet ducts, a rod extending from the body of the auxiliary valve and adapted to be lifted by the cylinder to open the auxiliary valve after the cylinder has passed a certain way fromits lowest position, the main valve being controlled by the variation of the hydraulic pressure in connection with the opening and closing of the auxiliary valve.

THEO SEIFER.

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