US288460A - Half to alfred king- and joseph smith - Google Patents

Description

(No Model.)

8 s. F. LoQK-B.

.STEAM AGTUATBD VALVE. No. 288,460. Y. Patented. Nov..13, 1883.

Fig. 5. Y

N. PETERS. Phoblk vgnphen Washiugwn. D.C

\ UNTTn STATES PATENT Trios.

HALF IO ALFRED KING AND JOSEPH SIWIIIH, OF SAME PLACE.

STEAM-ACTUATED VALVE.

S?ECIFICATION forming part of Letters Patent No. 288,460, dated November 13, 1883,`

" Application led March 27, 1883. (No model.)

' ing isa specification.

Myinvention relates to those pumps where the main steam-valve is moved by a secondary steam-piston, thev secondary piston being in turn actuated by an auxiliary valve, which receives its motion from the main steam-piston or piston-rod, the object of my invention being to inclose all the levers, valve-rods, and appliances for communicating motion from the main piston to the auxiliary valve inside the steam-cylinder and steam-chest, thus obviating the necessity of any valve or tappet-rod pro- 2o jecting through the walls of the cylinder or steam-chest, to require packing, thereby lessening the cost of construction and expense and care of operating the pump. I attain this obj ect by the mechanism illustrated in the accompanying drawings, in which-V Figure l is a vertical section of the steamcylinder of a pump on line x Fig. 2, with the steam-chest, secondary steam-piston, and main valve removed; Fig. 2, a top view of the valve-seats with the valves removed on line y y, Fig. l; Fig. 3, a side and bottom view of the auxiliary lvalve; Fig. 4, an outside View of one cylinder-head with the cap holding the lever removed, and Fig. 5 a side view of the cap and lever as removed Vfrom the cylinderhead.

Similar letters refer to similar parts in the several views.

A represents the main steam-oylinder;'B, the piston; C, piston-rod; D, the cylinderheads: E, the auxiliary valve.

In Fig. 2, F are the main steam-ports; G, the main exhaust-port, H, steam-passages from the secondary steam-cylinder, (these are also shown in dotted lines in Fig. 1;) I, exhaust port from the secondary steam-cylinder.

In Fig. 3, K represents the groove in the under side of the` auxiliary valve, ufurnishing the connection between the steam-passages H and the exh aust-port I, alternately, as the valve is moved.

To the "under side of the auxiliary valve E I attach the pins a c to one side of the line of the groove K, and in the valve-seatI provide the slots b b, in which the pins a c play, the slots being elongated sufficiently to allow the necessary motion to the valve. On the inside of the cylinderheads of the main cylinder A, I place the levers c c', recessed into the cylinder-head sufficiently that ,y when the lever is in the upright position it is flush with the inside of the cylinder-head.

Between the upper end of the levers c and c', respectively, and the pins a at, and moving in a bore between the valve-seat and the shell of the main cylinder,I place the tappet-rods d d. These rods must be of a length so that when placed in position against the pins a c the distance between the extreme ends of the two rods shall be greater than the distance between the upper ends of the levers c c when both levers are in an upright position by a distance equal to the reqniredthrow of the valve E, and the length of each rod such that, in their alternate action, the valve E shall be moved back and forth on the valve-seat to the right positions.

The operation of this mechanism is obvious. In the drawings, the piston B is shown as at the extreme rear end of the cylinder and at the end of the stroke. In attaining that position it has forced the lever c into lthe recess,

STEPHEN F. VLOOKE, OF TITUSVILLE, PENNSYLVANIA, ASSIGNOR OF .ONE-

and consequently, through the medium of the lever, the tappet-rod d and pin a moved the valve E to the left, opening the exhaust-port from the left end of the secondary cylinder, allowing the secondary piston to move to the left, and carrying with it the main valve. At the same time, through the medium of the pin a and tappet-rod d', the top of the lever c is forced back and the lower end thrown out into the cylinder. The piston B then commences the return-stroke, the valves and levers remaining in the` position shown by the full lines in the drawings until the piston B strikes the lever c and in turn forces it back, when the levers, tappet-rods, pins, and valves take the position shown by the dotted lines, and the action of the piston is again reversed. The

slot b b', respectively, in the valve-seat, the

roo

slots being covered and closed by the body of v the valve E, they are entirely independent of each other and of the exhaust-ports. There can, therefore, be no escape of steam from the main cylinder around the tappet-rods d d into the exhaust-port or to the other end of the cylinder. 'Ihe rods therefore do not require packing, nor are their movements interfered with as working against the pressure of steam in the working end of the main cylinder.

The levers may be hinged direct on the inside of the cylinder-heads, if desired; but for convenience of access and of removal in case repairs are needed, I make an opening in the cylinder-head, as shown more particularly in Fig. 4, Ebeing the opening. Over this opening I place the cap f, (shown in Fig. 5,)which cap has an inward projection, g, extending inward to be flush with the inside of the cylinderhead, and in this projection the lever c is hinged, the cap being secured to the cylinderhead by bolts. By removing the bolts the cap and lever can be removed Without removing the cylinder-head, access being also had tol the tappet-rod.

By my construction I secure simplicity of action and cheapness of construction and operation. All the mechanismV being included within the steam-space, it is constantly lubricated by the steam; neither are there any valve-rods requiring packing-boxes. The only packing required is that around the main piston-rod C; also, the distance between the steam-cylinder and the Huid-cylinder may be materially shortened.

I do not claim the broad principle of levers attached to each cylinder-head, and tappet-rods acting on a stem from the auxiliary valve, as I am aware this device has been heretofore used.

What I do claim as my invention is 1. In a steam-pump, the combination, with the auxiliary valve E, having upon its underl surface the two pins a ce, tting into and moving in the-slots b b', respectively, said slots being entirely independent of each other, and having no open connection with the steamchest or exhaust-port, of the tappet-rods d d', and the levers c c, pivoted in each cylinderhead of the main steam-cylinder, substantially as described.

2. In a steam-pump, the combination of the levers c c', hinged on the inside of `each head, respectively, of the main steam-cylinder, the tappet-rods d cl, and auxiliary valve E, having the two pins a a', project-ing from its under side into the slots b b in the valve-seat, said slots being entirely independent of each other and covered by the valve, and having no opening into the steam-chest or exhaustport, whereby steam can escape from the main cylinder around the tappet-rods d d', substantially as shown and described.

3. In a steam-pump, the combination of the cylinder-heads D, provided with. the opening @and removable cap f, and the actuating-lever c, said lever being pivoted to the cap for convenient access to said lever and the tappetrod d, substantially as described.

STEPHEN F. LOCKE. W'itnesses:

A. B. HOWLAND, MARY E. Looxn.

Images