US1089718A - Fluid-controlling mechanism for cylinders. - Google Patents

Description

A. N. METZELAAR.- FLUID CONTROLLING MECHANISM FOR CYLINDERS.

APPLICATION FILED JAN.18, 1913.

Patented Mar. 10, 1914.

2 SHEETS-SHEET 1.

IrJIf M l I I I l 0 I A I v I r 1 1 I I l y I WITNESSES INVENTOR Q11. {ha 9 W,

1- 1 ,Q/MW

ATTORNEY A. N. METZBLAAR. FLUID CONTROLLING MECHANISM FOR CYLINDERS.

APPLICATION FILED JAN. 18. 1013 ATTORNEY Patented Mar. 10, 1914.

2 SHEETS-SHEET 2.

INVENTOR a. nmuy w' COLUMBIA PLANOGRANI cn.. wAsmNfl'rnN. n. c

ADIRJiAN N. METZELAAR, OF NEW YORK, N. Y.

FLUID-CONTROLLING MECHANISM FOR CYLINDERS.

Specification of Letters Patent.

Patented Mar. 10, 1.914.

Application filed January 18, 1913. Serial No. 742,973.

To all whom it may concern Be it known that I, ADRIAN N. Mn'rznman, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Fluid- Controlling Mechanism for Cylinders, of which the following is a specification.

The present invention relates to improvements in the means for automatically reversing the direction of pressure lluid, as steam, admitted to opposite ends alternately of a cylinder, for reciprocating a piston.

The invention is primarily intended for use in a steam cylinder for operating a reciprocating pump, but is not confined thereto.

The object of the invention is to provide such means which will involve few moving mechanical parts and be very etlicient .in operation.

In the accompanying drawing, Figure 1 is a broken vertical section of a steam cyl inder to which my invention is shown as applied; Fig. 2 is an enlarged broken ver' tical section of a controlling valve; Fig. 3 is a plan view of the cylinder; Fig. 4t is a broken vertical section at right angles to Fig. 1 on the line 4-4: of Fig. 1.

Referring to the drawing, 1 indicates a fluid pressure cylinder having therein a piston 52 connected to a piston rod 3 for operating'a pump or the like. On the upper head t of said cylinder is mounted an auxiliary cylinder 5 having a central main luid supply pipe (3, an exhaust conduit 8, a port t) leading to the upper end of the main cylinder, and a port 11 leading through the wall thereof to the lower end of said cylinder. In said auxiliary cylinder can recip rocate a slide or D-valve 13, adapted to connect either of the ports 9 and 11 with the exhaust port 8, the other of said ports 9, 11 then communicating around said slide valve, with the main fluid supply pipe (3. Said slide valve is held between pistons 16 in the cylinder 5, rigidly connected by side bars 1.7, said piston, and also said slide valve, being prevented from turning, by means of a square guide bar 18 connected to one of said pistons and sliding through a square hole 19 in the corresponding cylinder head, said cylinder head being formed with a stuffing box 21 through which passes a cylindrical extension 22 of said guide bar.

Connected to the respective ends of said cylinder 5 are pipes (33, (i i, which lead, as will be hereinafter explained, to controlling valves at opposite ends of the main cylinder. In each head of said main cylinder is I screwed, as shown at 26, a cylindrical valve casing 27 having in its inner surface upper and lower pairs of circular grooves 28 and near its lower end a shoulder 29, the outer end of said valve casing being closed by a screw cap 3i having an extension 232 to form a stutling box. \Vithin said casing and restiug upon its shoulder is a bushing 33, hav ing upper and lower pairs of circular series of holes 34L registering with said grooves, said bushing being held down against said shoulder 29 by means of a sleeve 36 having a reduced externally threaded portion 37 screwed into the outer end of said valve casing. The upper terminal portion of said bushing is internally threaded, as shown at 37 for the purpose of facilitating its extraction, when desired, from the valve casing. The outer end of said sleeve is closed by a screw cap 31 having an outward extension 32 to form a stulling box. Fitting snugly within the valve casing and bushing, and passing through a central aperture in said screw cap, is a hollow piston valve 40, having inner and outer annular grooves ii, 4.2 adapted to register respectively with the inner and outer pairs of series of holes 34:. An outer portion of said piston valve is formed with an annular extension or piston 43, which can slide in a cylindrical recess t l formed between the piston valve and the sleeve 36, and is adapted to be pressed against an end {to of said recess 4:4 by pressure l'luid admitted to said recess by registering conduits L7, 48, in the sleeve and valve casing respectively, the inner end of said conduit 41-8 being supplied with pressure fluid by means hereinafter described. A screw cap it) is screwed around the threaded outer extension 32 of the screw cap 3t, and a glainl 50, continued in said screw cap 49, forms with said extension a stutling box. The piston valve 4-0 extends through a central aperture in said screw cap it).

Vithin the hollow piston valve i0 is a valve stem 52, screwed, as shown at 51, in said. piston valve, and supporting a valve head 53. By screwing in or out the valve stem the position of said head can be adjusted as desired, and it is secured in its adjusted position by means of a lock-nut 5 f screwed on. a threaded portion 56 of said valve stem.

Distinguishing from one another the circular grooves 28 by their degrees of proximity to the corresponding end of the cylinder, the fourth grooves 28, that is, those most remote from the ends of the cylinder, are connected to exhaust by pipes 61. The second groove are connected with the main fluid supply by pipes 62. The third groove of the upper valve and first groove of the lower valve are connected by pipes 63 with the left end of the auxiliary cylinder, looking from the piston valve, and the first groove of the upper valve and third groove of the lower valve are connected by pipes 6a with the right end of said cylinder. conduit 48 also communicates with a fluid supply pipe 62.

The following is the mode of operation of the apparatus: Supposing that the piston is ascending, and strikes the valve head of the upper valve, then pressure fluid passes by the pipe 62, second series of apertures 84;, inner groove 41, first series of apertures 34., and pipe 64:, to the right end of the auxiliary cylinder. At the same time pres sure fluid passes from the left end of the auxiliary cylinder, because the pipe 63 com municates with the pipe 61 leading to exhaust, by reason of the outer groove 42 in the valve registering with the upper pair of series of aperture 34 in the valve casing. Thereby the auxiliary piston is moved from right to left, and pressure fluid is admitted to the upper end of the main cylinder, and the lower end of the main cylinder is open to exhaust. As soon as the piston descends, the valve is pressed downward by the pressure of fluid admitted by the conduits 47, 48, into the cylindrical chamber 44, and the valve is restored to its normal position.

The advantages of the apparatus are that.

the pressure fluid and water cylinders can be placed close together, only suflicient room being necessary between the stufling boxes to allow for repacking them. The main piston must make a full stroke before it can be reversed. supply are short, and as direct as they can be made. The wearing parts of the reversing valve will last a long time as there is practically no pressure between the valve and bushing. Should these parts become worn out they are easily and quickly re- The usted.

The passages for the main fluid.

newed and replaced. The entire mechanism is simple, can be readily examined and is easily understood by any steam engineer.

The apparatus is well adapted to a steam pump, of which the piston speed is usually low. For high speed pumps the head of the valve would have to be screwed in slightly. Throttling valves 69 are fitted to the pipes 63 and 64 close to the hollow valve body to regulate the passage of the glass through said pipe and prevent the slamming of the piston in the auxiliary cylinder. A small hole 70 is made through the hollow valve to prevent the accumulation of any steam that might pass by the lower threaded part of the valve. The hollow shaft is formed with two parallel flat portions 71 adapted to be engaged by a wrench to prevent turning of the hollow valve when the valve tip is ad- The lower sides of the holes of the first and third series in the removable bushmg are preferably made flat, in order to give In combination with a main cylinder having an exhaust port, and ports leading to its opposite ends, and a piston reciprocable therein, an auxiliary cylinder, a valve for controlling said ports, means for moving said valve by the pressure of fluid admitted to opposite ends of the latter cylinder, valve casings secured to the ends of the main cylinder and open at both ends, tubular slide valves therein, also open at both ends, stems screwed in said slide valves and extending wholly therethrough means on the outer ends of the stems for screwing them in the slide valves, said stems having on their immediate ends heads projecting into the main cylinder and adapted to be alternately engaged by the main piston to move them in said casing, and conduits between said valve casing and auxiliary cylinder, whereby pressure fluid is admitted to either end alternately of said auxiliary cylinder and exhausted from the other end upon the actuation by said main piston of said valves alternately.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ADRIAN N. METZELAAR.

\Vitnesses F. M. VVIZIGIIT, D. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ratents,

' Washington, D. C.

Images