US382168A

US382168A - Valve-gear

Info

Publication number: US382168A
Authority: US
Publication date: 1888-05-01
Anticipated expiration: 1905-05-01

Description

(No Model.) i

' H. LECHTENBERG.

VALVE GEAR.

Patented May 1, 1888..

HENRY LEGHTENBERG, OF QUINCY, ILLINOIS.

VALVE-GEAR v sPncrFrcA'I-ION fon-ning part or Leners Patent No. 382,168, dated May 1,1888.

Application filed November 17, 1887. Serial No. 255,416.

(No model.)

To @ZZ whom it may concern:

Be it known that I, HENRY LnoHTnNBERG, of Quincy, in the county ot' Adams and State of Illinois, have invented certain Improvements in ValveGear, of which the following is a specification.

My invention relates to a mechanism for imparting a reciprocating movement to the valves of steam-pumps, steam-engines, 85o., in which the valve motion is obtained from the main piston-rod; and it consists in combining with the pistonrod and the valve-operating rod or spindle an intermediate spring, which, being compressed by the piston-rod, acts to throw the valve lirstI in one direction and then in the other, and tappets or locking devices by which the spring is prevented from moving the valve except at the proper times.

In the drawings I have represented my improvement as applied to that familiar class of pumps in which a piston-rod -is provided at one end with an actuating steam-piston and at the opposite end with the pumpspiston.

Figure l represents a longitudinal vertical section through the steam cylinder and the entire Valve mechanism, one end of the pumppiston being also shown in side elevation. Fig. 2 is a top plan View of the valve and valve-chest, being shown in horizontal section on the line w cv. Fig. 3 is a crosssection through the valveAchest on the line y y of the preceding guresA Referring to the drawings, A represents a steamcylinder containing a reciprocating pis= ton, B, attached rigidly to the piston-rod C,

which is extended, as usual, through and beyond the'end of the cylinder andjnto a second cylinder, D, where it is attached to the usual pump-piston, E. The steam=cylinder is provided with eduction and induction ports a and a', leading from opposite ends to points near the middle, and also provided with an eduction-port, b, leading to the exterior, these ports being similar in general arrangement to those in ordinary slide-valve engines.

\ F is the steam-chest located on the top of the cylinder and containing the reciprocating valve G, which is of the balanced type and of V form in cross-section. The valve is provided on opposite sides with duplicate ports constructed as shown, so that as it is moved to and fro it delivers the steam into and out of the opposite ends of the cylinder alternately, in a manner which will be understood by any person skilled in the art.

H represents the valvespindle projecting through and beyond thechest and sustained in suitable guides, I, that it may move freely in an endwise direction. Near its opposite end the valvespindle H is provided with two fixed collars, J, which, encountering the guides I and I' alternately, limit the reciprocation oi' the valve.

To `the piston-rod C is secured rigidly an arm, K, carrying at its upper end a sleeve, L, which encircles the valve'spindle I-I. In op posite ends of this sleeve are mounted two smaller sleeves, M and M', and within the sleeves around the valve-spindle His mounted a strong spiral spring, N, which, bearing against the sleeves M and M', tends to push them outward in opposite directions. Each of the smaller sleeves is provided at its inner end with a flange, e, by which its outward movement is limited, although it is permitted to move freely inward on the application of sufficient force to effect the compression of t-he spring.

To the guides I and I' are pivoted two dogs or tappets, O and O', which are adapted to act alternately behind the respective collars J and J', in order to lock the valve'spindle against motion first in one direction and then in the other. rlhe reciprocating arm K carries on its upper end a roller, P, or equivalent projection, adapted to act on the two dogs alternately and effect their disengagement from the collars oi' the valve-stem. r The operation is as followss Assuming that the pistons and piston-rod are moving toward the right, as indicated by the arrow in Fig. 1, the dog O will stand in engagement with the collar J, holding the valve to the left, as shown in Fig. 1. As the piston rod approaches the completion of its movement to the right, cars ry'ing the sleeves and the spring with it, the sleeve M' encounters the collar J', which ar rests the movement of the sleeve M'. As,

however, the other parts 'continue their advance, the spring is subjected to a strong compression, so that, acting through the sleeve M on the collar J', it acts to move the valvelspindle and valve to the right. Vhile the spring is thus acting, and at or near the end of the piston-stroke, the roller P encounters'the dog or tappet O and lifts the same ont of engagement with the collar J, whereupon the spring acts to move the valve-spindle and valve quickly to the right, therebyv reversing vthe course of the steam into the cylinder. When this action occurs, the dog O drops into engagement behind the collar J and holds the valv`e-spindle tothe right. The piston and its connections now move to the left.` The sleeve Mencounters the collar J and the spring is compressed, so that it tends to move the valve to the left. At the proper time the roller P disengages the dog O, whereupon the spring pushes the valve to the left, the parts again assuming the position represented in Fig. l, with the dog O engaged behind the collar J'. v Y

It will be perceived that under my construction the piston-rod acts upon the spring` in such manner that the latter tends to move the valve rst to the right and then to the lefta`nd that the dogs or tappets operate to hold `the valve until the spring is properly compressed, and then to release it, so that its movement may be suddenly effected by the spring'. p

It ismanifest that the details of construction may be modified in various respects, the essence of my invention residing in the combination of a valveoperating spring `coinpressed through the action fof the piston-rod with dogs which prevent the valve from moving during the compression of the spring until the proper time arrives.

While I prefer to inclose the spring by means of the sleeves in the manner shown, it is obvious that any equivalent device which will permit the spring to be compressedby the arm K against the collars J and J alternately, may be employed without passing beyond the limits of my invention.

. Having thus described my invention, what I claim is- 1. In a valvegear, the reciprocating valverod H, having the end collars, J J, in combination with the two independent pivoted dogs O O', alternately engaging the respective collars to hold the valve-rod momentarily at rest, the reciprocating piston-rod, the arm K, xed rigidly to saidl rod and acting upon the dogs alternately to effect their disengagement from the collars, the spiral spring loosely encircling' the valverod, and the two sleeves M M', seated against opposite ends of the spring and connected with the arm K to yield each toward the other, as described, whereby the arm on the piston-rod is caused to directly effect the compression of the spring rst in one direcltion andthen in the other against the collars of the valve rod, and also to directly trip the dogs,that the spring may move the rod at the proper time.

2. In combination with the piston-rod C, the arm K, xedrigidly thereto and provided with the Asleeve N and roller l?, the spiral spring encircling the valve-spindle, the sleeves M and M', seated against the ends of the spring, the valve-spindle provided with the two collars, and the locking dogs or tappets adapted engage said collars alternately.

In testimony whereofIhereuntoset myhand, this 22d day of October, 1887, in the presence of two attesting witnesses.

HENRY LECHTENBERG.

Witnesses:

HENRY STOETZEL, JOE STEINKAMP.