US1863068A - Throttle - Google Patents

Description

Jun 14, 1932. HPPY 1,863,068

THROTTLE Filed June 19. 1929 $1172 INVENTOR.

By d" A TTORNE Y.

Patented June 14;, 1932 v UNITED STATES PATENT OFFICE GEORGE F. PIPPY, OF EAST ORANGE, NEW JERSEY, ASSIGNOR T AIIIERICAN THROTTLE COMPANY INC., OF NEW YORK, N. Y.

THROTTLE Application filed June 19,

The invention relates to throttles of the multiple type and has for its purpose the pro vision of a more desirable form of devices of this class.

The invention is illustrated in the accompanying drawing in which Fig. 1 represents a fragmentary transverse sectional view of a superheater header arranged in a locomotive smoke-box with my invention applied; Fig.

w 2 shows an enlarged sectional view on line 22 of Fig. 1 and Fig. 3 shows a view similar to that of Fig. 1 of a modification.

I have shown my invention applied to a throttle arrangement of a form which has gone into wide use and shall briefly describe the general arrangement as far as its features are old.

The smoke-box shell is shown in cross-secvtion at 1, 2 being the ordinary fines carrying the hot products of combustion from the fire box into the smoke-box only a few of the top row of these fines are shown. Within these flues are placed the tubular superheater elements or units 3 whose ends 4 are secured to the under side of the superheater header 5.

Steam is delivered by these superheater elements in superheated condition into the top chamber 6 of the front portion of the superheater header. This chamber 6, as well as the chambers lying below it and presently to be further referred to, are preferably made integral with the superheater header although this is not essential. The chambers just referred to are the intermediate chamber 7 and the lowest chamber 8. The intermediate chamber 7 is separated from the upper chambers 6 by the partition 9 and from the bottom chamber 8 by the partition 10. The partition 9 has a series of ports 11 preferably arranged in a straight line as will be clear from the figure. Aligned with each port 11 is a circular opening 12 in the lower partition 10. In the top wall 13 and aligned with the ports 11 are the openings 1 1, closed by the caps 15, each of which has formed in it a cylindrical space 16. These caps are held removably in place by screws. or studs and nuts. 17. The cylindrical spaces 16 are accurately aligned with the ports 11 and the cylindrical openings 12.

Each port 11 is controlled by a valve 18 1929. Serial No. 372,023.

which has a downwardly extending stem 19 and an upwardly extending stem 20. The stem 20 has on its upper end a piston 21 fitting with a certain amount of clearance in the cylinder 16. The lower end of the stem 19 is equipped with a piston fitting in and reciprocating in cylindrical opening 12. Heretofore in constructions of this type this piston was a single integral with the valve 18 and stem 19. This is changed by my invention as will be described later on. The piston has in the past been provided with a downward extension which feature is retained in my construction and appears at 22. It has, as will appear more clearly from the inspection of Fig. 1, the shape of a stirrup and is engaged by the cam 23 fixed to the shaft 24:.

It will be understood that while in the pre ceding description reference has been made at times to only a single valve, the same description applies to the others.

The shaft 24 can be rotated or rocked by means of the arm 25 fixed on the end of shaft 24 which for this purpose extends to the outside of the smoke-box through a stufling box 26, the end of said arm having connected to it the throttle rod 27 which extends back to the cab.

The space 6 is directly connected to the space 8 through a small port 28, controlled by a pilot valve 29 and the passage 30. The pilot valve is actuated by means of the cam 31 also fixed on the shaft 24.. This pilot valve is equipped at its top with a stem 32 and a piston 33 reciprocating in the cylindrical space 34 of cap 35.

From space 7 two steam pipes (only one of them showing at 36) lead to the steam chest and engine in the ordinary way. The action of the device described above may be briefly stated as follows: The superheated steam delivered to the space 6 is prevented by the valves 18 from flowing to the pipes 36 and so to the steam chests. Steam that has leaked past the pistons 21 into the spaces 16 and exerts pressure on the upper side of the piston keeps the valves seated. The upward. pressure on the under side of the pistons is counterbalanced by the downward pressure on the valves. lVhen the engineer wishes to admit steam to the steam chests he operates the throttle lever thereby turning the shaft 24 in the direction to move the cams 23 upward. These cams are so arranged on the shaft 2% that the cam 31 opens the pilot valve 29 before the remaining cams engage their associated valves. The opening of the pilot valve 29 admits steam into the lowest chamber 8.. This balancing steam admitted into the chamber 8 put the valves into a balanced condition by exerting upward pressure onthe lower sides of the pistons reciprocating in the openings 12 offsetting the downward pressure onpis tons 21. The cams 23 can thereafter easily raise the Valves 18 from their seats. The purpose of the pistons 21 is to damp any tendency of the valves to reciprocate rapidly especially when they are slightly open. This feature does not form a part of the present invention; i

The present invention relates, as sug estedabove, to the pistons reciprocating in t is cy' lindrical openings 12. When the valves are made integral, including the pistons, they can not be ground to their seats while the cams 23 lie within the openings of the stirrups. This stirrup arrangement is preferable toany other means so far devised for actuating the valves. I have, therefore, devised the present construction with the idea of retaining this desirable feature and yet make it possible to grind the valves to their seats, keeping the cams in place. It will be .understood that it is highly desirable tobe able to effect this grinding without being compelled to move the cams out of their slots in the stirrup by turning the shaft 24.

The means for effecting this are as follows: The lower end of stem 19 carries the threaded head 38 to whichisscrewed the cap 39. This cap has two steps 40 and 40a, the former of which engages the'bottom of head 38. The stirrup 22 is provided at its upper end with a cylindrical portion 37 a, extending through a corresponding opening in cap 39, and an enlarged cylindrical portion or head 37 whose lower annular face lies against the shoulder or step 40-61. The vertical height of the head 37 is somewhat smaller than the vertical distance between the step.40a and the bottom of 38, and the fit of the head in the cap is loose.

As a result the valve 18 together with its connected parts can be turned for the purpose *of grinding it on its seat while the portion 37 and the stirrup 22 are kept from turning by the cam 23. The grinding is effected in the usual way by means of a tool engaging the,

holes 41 or any other preferred way.

In the modification shown in Fig. 3 cylinder 39V is made integral with the stirrup 22 and has extending upward from it an inverted-U structure or bridge 42. This bridge 42 has an opening in its upper face through which extends the extension 43 of the shaft 2 19. A shoulder 44 on the shaft engages the upper face of the bridge while the lower end of 43 is threaded and carries the nut 45. Enough play is left between shouldert l and nut 45 so that the valve 18 can be turned without turning the piston 39'.

Other advantages besides the possibility of easy grinding as above described results from my improvement. Thus it is possible where desired to make the valve of different material from the piston 39. Moreover the combined structure of the two pistons and the valve has more flexibility than when the entire structure is made unitary. The valves therefore seat with greater ease and certainty.

I claim:

1. In apparatus of the class described, the combination of a casing having two partitions dividing the interior into an intermediate and two outer chambers, said partitions each having a port, the two ports being alined with each other, a disk valve controlling one of the ports and opening toward one of the outer chambers, a piston reciprocable in the other port, a slotted stem connected to and extending from the-piston into the second outer chamber, an intermediate stem connecting theval've to the piston, the connection between one of the stems and 'the piston being by a swivel joint permittingrelative rotary motion and no material longitudinal motion, and an operating cam extending into the slot; whereby the valve can be positively raised and lowered by means of the cam and can be rotated without the removal of the cam from the slot.

2. The apparatus according to claim 1, the swivel joint being between the piston and the lower stem.

3. The apparatus according to claim 1, the

swivel joint being between the piston and the

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