US758931A

US758931A - Valve-actuating mechanism for blowing-engines.

Info

Publication number: US758931A
Application number: US369200A
Authority: US
Inventors: Gustav Bernhard Petsche
Original assignee: Southwark Foundry & Machine Co
Current assignee: Southwark Foundry & Machine Co
Priority date: 1900-02-02
Filing date: 1900-02-02
Publication date: 1904-05-03
Anticipated expiration: 1921-05-03

Description

No. 758,931. I PATENTEDMAY 3, 1904. G. B. PETSCHE. VALVE AGTUATING MEGHANISMIOR BLOWING ENGINES.

APPLICATION FILED FEB. 2, 1900.

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No. 758,931. PATENTED MAY 3, 1904. G. B. PETSCHE.

VALVE ACTUATING MECHANISM FOR BLOWING ENGINES.

APPLICATION FILED rm. 2, 1900.

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VALVE AGTUATING MECHANISM FOR BLOWING ENGINES. APPLIOQQTFOH rum) r1112. 2, 1900.

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TINTTET) STATES Patented May 3, 1904.

PATENT OEEicE.

GUSTAV BERNHARD PETSOIIF, OF PHILAI)IGLll'llA, PENNSYLVANIA,

ASSIGNOR TO THE SOUTIIIVARK FOUNDRY & MACHINE COM- PANY, OF PHILADELPHIA, PE

PENNSYLVANIA.

NNSYLVANIA, A CORPORATION OF VALVE-ACTUATING MECHANISM FOR BLOWING-ENGINES.

SFECIFICATION forming part of Letters Patent No. 758,931, dated May S, 1904.

Application flied February 2,1900. Serial No. 3,692. No model.)

To /z// whom it may concern/.- Be it known that I, (i-Us'mv Bnurruann .Pu'rseun, a sub ect of the Emperor of (:er-

many. residing in the city and county of Philai of the sliding-gridiron type in each head of In such engines the compressirig-cylinder. the admission-valves are positively, though intermittently, actuated in a fixed relationship to the constantly-moving parts of the engine, and although for the best results the deliveryvalve should be opened at varying periods, dependent on the compression of air in the receiver, it is also desirable that they should be closed by a positively-acting mechanism and, like the zulmission-valves, in a fixed relation to the constantly-moving parts. The intermittently-acting mechanism for opening and closing the zulmission-valves and for closing the delivery-valves is most conveniently made to embody cams both because they are well I adapted for giving intermittent motion to cont nect the ports and because the character of the motion imparted can be most conveniently regulated by means of cams.

The object of my invention is to provide a simple and highly-efiicient actuating device for actuating the valve actuating mechanism aforesaid and a device particular-l y which sunplities the independent adjustment of the iudividual valve-actuating mechanisms; and, generally speaking, my invention consists in securing in a plane intermediate of the heads of the compressingcylinder a rock-shaft ac- 3 tuated, preferably, through adjustable con- 1 nections by a positively-moving part of the engine and connecting said rock-shaft indethe connection of the intermediate shaft with its actuating devices will similarly change the adjustments of all the parts, while of course each individual connection from the intermediate shaft can be adjusted without making I any change in the adjustment and relative motion of the other connections.

Reference being now had to the drawings, in which my invention is illustrated, Figure I is a side elevation of a blowing-engine provided with my improved valve actuating mechanism. Fig. 2 is a front view of the compressing-cylindcr and the-actuating devices. Fig. 3 is a cross-section taken on the line 3 3 of Fig. 6. Fig. A is an enlarged detail of Fig. 3. Fig. 5 is a vertical section taken on the line 5 5 of Fig. (i, and Fig. 6 is a plan view taken on the section-line 6 6 of Fig. 5.

A indicates the framing of the engine; B, the steam-cylimler, having a steam-admission pipe B leading to it and an exhaust-pipe B leading from it.

C is the compressing-cylinder, having an upper head O and lower head U.

C indicates the ports of the delivery-valve through the upper head, and c the similar ports in the lower head.

O indicates the admission-ports in the upper head; 0, the similar ports in the lower head.

O indicates the receiver at the top of the cylinder; 6, the receiver at the bottom of the cylinder, said receivers connecting, through a pipe C, with a common blast-pipe O Dis the piston-rod connecting the compressing-piston I)" with the piston (not shown) in the steam-cylinder. This piston-rod has secured to it trunnion-like bearings, (indicated C between its upper and lower heads.

F and F are oppositely-extending leverarms secured to the shaft F and connected, as will be described, with the mechanism for closing the delivery-valves of the engine. f f are similar oppositely-extending lever-arms of the shaft F, coupled with the mechanism for moving the admission-valves of the engine.

H and it are respectively the upper and lower delivery-valves ofthe compressing-cylinder, best placed, as shown, so as to face toward the cylinder with their backs exposed to the pressure of the air in the receivers. The actuating mechanisms for the valves being similar, that for the upper valve being lettered with capitals and that for the lower valve with small letters, it will be suflicient to describe only the upper-valve-actuating mechanism. The rod H of the valve H passes through the stufiing-box into a cylinder I and is secured to a piston H moving in said cylinder and preferably formed with an open-ended cylindrical opening H in its rear face, as shown in Figs. 3 and 4.

H is a cylindrical projection extending in from the head of the cylinder H K is a conduit connecting the front end of the cylinder I with the interior of the compressing-cylinder C at a point near the end of the cylinder, but sufficiently far from it to be uncovered by the piston D after it has passed over it and is at the top of its stroke. In the conduit K, I provide at K valve mechanism which permits the free entrance of air from the cylinder 0 into the cylinder I. It regulates the back flow of or from the cylinder I into the cylinder C. This may be of any convenient character.

It will readily be understood that as the piston D moves upward the air compressed in front of it passes through the conduit K into the cylinder I and acts against the face of the piston H tending to move the valve H in a direction to open with an increasing force, which is resisted by the weight of the valve and by the constantly-diminishing excess of pressure holding the valve to its seat. In

practice these forces tending to hold the valve closed are sufficient to overcome the pressure on the actuating-piston until the pressures in the compressing-cylinder and the receiver are substantially equal, when the valve is opened with great rapidity. It will also be obvious that after the compressing-piston has passed above the conduit K the air in the cylinder I is free to flow back into the cylinderO with such rapidity as may be determined by the regulating device K.

Secured to the rear of the cylinder I are guideways (indicated at I) which support a slide J, having a recessed portion J, provided at front and rear, as indicated, with cam-rollers J and J. In the devices shown the slide J has secured to its front end apiston J which moves in the cylinder H of the piston H and is preferably formed with a central cylindrical opening J 6 and a regulable air-escape, (indicated at J It will readily be understood that as the piston H moves backward its cylindrical portion will move over the piston J*, the air escaping freely through the opening J until the piston, like cylinder H, enters the cylindrical opening J after which the air is compressed in the cylinder H and permitted to escape only with determined rapidity through the regulable device J The function performed by this device is to cushion the movement of the valve and its connected parts in opening--a function which is performed irrespective of the position of the slide J ,which is actuated by intermittently moving mechanism, and its forward stroke has the duty of closing the delivery-valve. This particular device forms the subject-matter of a separate application for a patent filed January 22, 1900, Serial No. 2,309.

L is a rock-shaft passing through the recess J of the slide J and having secured to it a cam L, which rests in contact with the camrollers J and J L is a lever-arm, also secured to the shaft L and actuated by the rod M, having an adjusting device M, with the lever-arm F of the intermediate rock-shaft F. The oppositely extending lever-arm F is similarly connected by the rod m, having the adjusting device m, with the cam-actuating lever Z which is connected to the shaft Z similarly to the arm L the cams L and Z, however, being adjusted, as shown, so that in each movement of the rock-shaft F one moves to close its controlled delivery-valve and the other moves away to permit the opening of its controlled delivery-valve.

Referring neXt to the admission-valves, which are indicated at N n and which are preferably placed so as to face outward from letters, it will be again sufficient to describe the upper-valve connections.

N indicates the valve-rod, which passes through the end of the cylinder 0 and is coupled to a slide 0, recessed, as indicated at IIO Lil

0, and provided with cam-rollers O and said slide moving in a guideway, (indicated at P.)

Q indicates a rock-shaft extending through the recess 0 and having secured to it a cam Q, the surfaces of which are in contact with the cam-rollers O and O", and which cam and the shaft Q are actuated by a lever-a rm Q connected by a rod R, havingan adjusting device R with the lever-arm f of the shaft F, the similar connecting-rod for the lower admission-valve being indicated at r and coupled with the oppositely-extending lever-arm f.

It will be obvious that for each movement of the rock-shaft F the ad mission-valves at opposite ends of the compressing-cylinder are actuated in different directions, the one closing and the other opening. It will also be obvious that in the arrangement shown and described an adjustment of the rod E, as by means of its adjusting device will similarly shift the position of all the valve-actuating devices connected with the rock-shaft F, while each one of these actuating devices can be adjusted independently of the other and without requiring any adjustment in the connection E.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a blowing-engine having admission and delivery valves of the sliding-gridiron type at both ends of the com pressing'1c vlimler and all moving in planes parallel to each other and transverse to the axis of the cylinder, the combination of oscillating cams arranged to move the admission-valves in both directions and in a positive relation to the moving parts of the engine, another set of oscillating cams arranged to move the delivery-valves in the direction to close them but not to open said valves, resilient, intermittently-aeting means acting to open the delivery-valves, a rockshatt situated in a plane lying between the ends of the cylinder and running transversely to the lines of movement of the valves, oppositelyextending lever-arn1s f", f, secured to the rockshat't, rods R, r, connecting said lever-arms with the cams ot' the :uhnission-valves, another set of oppositel vextending lever-arms F, F, secured to the rock-shaft, rods M, m, connecting said arms with the cams of the deliveryvalves, and means for connnunicating motion to the rock-shaft from a positively-moving part of the engine.

2. In a blowing-engine having admission and delivery valves of the sliding-gridiron type at both ends of the compressing-cylinder and all moving in planes parallel to each other and transverse to the axis of the cylinder, the combination of oscillating cams arranged to move the admission-valves in both directions and in a positive relation to the moving parts 7 of the engine, another set of oscillating cams arranged to move the delivery-valves in the direction to close them but not to open said valves, resilient, intermittently-acting means acting to open the delivery-valves, a rockshaftsituated on a plane lying between the ends of the cylinder and running transversely to the lines of movement of the valves,oppositelyextending leverarms f"", f", secured to the rockshatt, rods R, '1', connecting said lever-arms with the cams of the admission-valves, another set of oppositely-extending lever-arms F F, secured to the rock-shaft, rods M, 1):, connecting said arms with the cams of the deliveryvalves, means for independently adjusting the length of each of the rods R, w, and M, m, and means for communicating motion to the rockshat't from a positively-moving part of the engine, said means embodying an adjustable rod, such as E.

GUSTAV BEltXllAltll lll'lSCllE. \Vitnesses:

Cums. F. Mvnns, l). STEWART.