US1249877A

US1249877A - Throttle-valve-control mechanism.

Info

Publication number: US1249877A
Authority: US
Inventors: Otis W Young
Original assignee: PYLE NAT ELECTRIC HEADLIGHT CO
Current assignee: PYLE-NATIONAL ELECTRIC HEADLIGHT Co; PYLE NAT ELECTRIC HEADLIGHT CO
Priority date: 1915-01-16
Filing date: 1915-01-16
Publication date: 1917-12-11
Anticipated expiration: 1934-12-11

Description

0. W. YOUNG. TI-IROTTLE VALVE CONTROL MECHANISM.

APPLICATION FILED JAMAS. |915.

Patented Dec. 1L, NW.

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.To @ZZ whom it may concern.'

lle it known that l', @fris lll. Yoon o, a citizen oit the United bltates, residing at Ullicago, in the county oit @ook and bltate ot llllinois, have invented a certain new and useful lmprovement in rlhrottle-l/valvellontrol lllechanism, ot which the 'following is a specilication.

lln all steam engineering practice and particularly locomotive steam engineering practice the throttle valve is of the utmost importance. ltis necessary that it respond at once to the manipulation ojlthe engineerj that it remain tight.l that it bc easily handled and nuuiipulated, that it be` adapted to close when released and that it remain steam tight and continue to operate smoothly and easily under all dill'erent suriace conditions and different degrees of temperature and resultant change in boilerl and accompanying parts and one object, thereforeg oi my invention is to provide a throttle valve located Within. the boiler in such manner that it may continue to operate independent of changes in the temperature and resultant changes in size or shape et the boiler. fluir other object oil my invention is to provide a control gear which is convenient and easily arranged and supported and which will reduce to a minimum all undue strain and stress of the throttle valve stem and kindred parts. Another object is to provide suoli ay gear capable ot accurate adjustment and operation. @ther objects ot my invention ivill develop in the specilication.

llll'y invention relates to improvements in gears tor throttle valves and the like and While it is primarily destined for use in connection with a direct acting reciprocatinol throttle valve diagii'ammatically suggested herewith it is directly obvious that it is equally Well adapted tor use for any number ot ditterent purposes or in connection with diilierent types et valves. rlhe invention, therefore, is illustrated more or less diairrammatically in the accompanying; dravvings, whereinldigure l is a diagrammatic plan vievv el 'the valve and valve gear showing1 the boiler and packing sleeves and collars in section;

Fig. Q is a side elevation ot the valve conn trol braclret support with the control lever in section;

Fig. 3 is a side elevation of a, valve lever brochet and ltindred parte sluuviup; the valve stem in. end elevation with the boiler itself omitted. y

liilre parts a re indicated by lilre numerals throughoutthe several ligures..

l is the side Wall ot a locomotive or other steam boiler. i2 is the vffilve housing leading,1 from it. llt one side the dischaii'pge pipe coupling1 3 and projecting 'from it at the top the intuire pipe il. llhe housinp,1 contains slidably mounted therein a valve sleeve ported as at 51L to control the passa ne ot steam through the intalre pipe Ll and the body et the housing 2 out through the exhaust pipe connection llllien the valve sleeve moved toward the boiler ivall. aivaj'f trom the exhaust end the closed portion ob Will talre the place oli the ports and uo steam can pass through. lllhen the valve sleeve is moved in the opposite direction the ports ivill be opened Wider and ivider to permit increased passa ge of the steam. 6 is a. removable cover plate coveringu the end o'f the valve housing removed troni the discharge. 7 is a` valve stem passing,I through the centrally apertured cover plate and is attached to one end of the valve 5 by any suitable means not here shown and. projects out beyond the boiler Wall. d is a bracket on the boiler and 9 is a. bell cranlt pivotcd at one end upon the bracket. lll is a lever pivoted on. the bell crank 9 and in pivotal engaugen ment at one end with the valve stem 'l having,l a control handle il at the other end. l2 is a quadrant or guide support :termed on and carried by the lree end ot the bell crank lever having' loclrinpy teeth lll along one side in opposition to the loch member lll on the lever l0. This loch member is 'thrust against said teeth by lthe sprinp; lli and may be Withdrawn trom them by the linlr lo controlled by the hand lever l? adjacent the handle ll. l@ is a. plate apertured to register with an aperture in the boiler shell and held in position by means ot the set screws l@ so that the paclrinp; ring' QU is compressed between it and the outside et the boiler shell to malte a close joint between the plate and the boiler. @l is a sleeve pro@eatingoutwardly trom the plate le. 9193 is a paclrinpV tube rigidly attached at its inner end to the cover plate G and nimlriiug1 a steam tight joint therewith and projecting out through the boiler Wall plate lll and beyond the end et the sleeve 2l.. Q3 a, packing pgland in the sleeve ttl. surroiuidiup; the tube to malte (lll lilo

a steam tight slidable joint between the tube and the sleeve and boiler thus permitting movement of the valve housing and expansion and contraction of the tube with respect to the boiler all without disturbing the steam tightness of the joint between the boiler and the tube. It will be noted that the tube 22 surrounds the valve stem 7. Adjacent the outer end of the tube is located a packing ring or shell 24 and in the end is located the packing gland 25 and any other suitable lmeans can be made to form a steam tight closure between the valve stem and the tube so as to permit free movement of the valve stem back and forth without interfering with the steam tightness of the joint between it and the 'tube and through it the boiler.

It will be evident that while I have shown in my drawings an operative device, still many changes might be made both in size, shape and arrangement of parts without departing from the spirit of my inventionl and I wish, therefore that my drawings be regarded as in a sense diagrammatic.

The bell crank lever 9 has at one end the sleeve 30 and this sleeve is held between the arms 8a, S of the bracket 8 and pivotcd 011 them. The result of this is that the bell crank lever is free to rotate with respect to the bracket S about a .vertical axis and in a horizontal plane but is held against any other movement and since the lever 10 rests on this bell crank arrangement it is obvious that that lever is properly guided and set and may be operated by the engineer Without danger of bending or distortion of the valve stem and thus the need of any additional support for the lever is obviated and the bell crank, therefore, provides a combined lever support, lever fulcrum and locking quadrant.

The use and operation of my invention is as follows 'Ihe valve. housing is suspended within the interior of the boiler and is subject to the pressure of the steainand also to the temperature conditions prevailing in the boiler. Both the housing, its supports and the 'boiler are subject to varying temperature conditions and all these vary in relative positions and it becomes necessary to provide means for controlling the valve within the housing from the outside without interfering with the shape, position and size changes caused by the temperature variations.

In the position shown in the drawings the valve is open and steam rushes in from the interior of the boiler into the valve housing at the top passing through the valve and discharges through the discharge pipe. The. valve housing is under such circumstances substantially filled with steam at about boiler pressure. When the valve is closed the ports shown are withdrawn from register with the intake pipe. It is evident that the outside or outer portion of the housing will be subjected to boiler pressure but the inside of the housing on the inside oi" the valve communicating` therewith will be subjected to substantially no pressure. 'lo prevent leakage of pressure along the joint between the valve housing and the piston rod it is necessary to provide sonic kind of friction or flexible packing. To prevent leakage of steam around the valve stein where it passes through the boiler wall it is necessary to provide a similar packing. Under ordinary circumstances there is then a packing gland inside the boiler between the valve stem and the valve housing. and another packing gland outside the boiler between the valve stem and the boiler and each of these glands is subjected at all times to the maximum boiler pressure.

In my invention I substitute for the gland inside the boiler in the wall of the valve housing a packing tube which is in fixed rigid steam tight relation with the housing and projects ont through the boiler wall. This packing tube is large and is surrounded with a packing gland so that the tubey may be free to slide with respect to the boiler under the iniiuence ot pressure and temperature variations and this gland which is large and which is subjected to very little movement is the only gland which is always exposed to the full boiler pressure. In the end of this tube I provide a smaller packing gland between it and the valve stein and this gland is outside ot the boiler and it can be easily inspected and adjusted since when the valve is closed there is no steam pressure inside the packing tube and it is obvious that the valve stem is subjected to pressure at no time whatever and thus is protected and can easily be taken care ot at all times.

The valve stem must be thrust forward to open the valve and when it has been opened and there is a pressure inside the valve housing, that pressure is unbalanced and always tends to yieldingly close the valve so that when the engineer lets go of valve operating mechanism the valve will automatically close. The controlling lever is pivoted at one end on the valve stem and at the other end on a tioating fulcrum. It will be understood that the purpose of the bell. crank lever which forms the floating fulcrum is to ob- .viate the necessity of a linkage connection with the valve stem since the bell crank is free to swing. It will be further understood that when the lever is rotated it positively drives the valve and that the valve will stay at the exact position in which it is put because merely lockingthe quadrant on the bell crank lever in fixed position with respect to the controlling lever will prevent relative rotation of the lever and quadrant lltl l ll

neaaevv and thus movement of the valve stein. The bell crank lever, of course, being,1 rigidly supported on the bracket thus furnishes a rigid and suliiciently strong support to keep the lever in the proper horizontal plane and to protect the valve stem against any undue stresses or strains.

l claim l. The combination with a control lever tor throttle valve stems and the like, ol a pivotally mounted plate upon which it is pivoted at a point removed from its end, the pivotal axes being` parallel, and means :tor holding the plate in a plane perpendicular to its pivotal axis.

2. lhe combination with a control lever for throttle valve stems and the like, of a pivotally mounted plate upon which it is pivoted at a point removed 'from its end, the pivotal axes being parallel, the lever being in slidable Contact with a portion of the plate removed from its pivotal point on the plate.

3. rlhe combination with a control lever :tor throttle valve stems and the like oit a plate upon which it ie pivoted at a point removed from its end, a bearing,l sleeve projecting from said plate at a point removed from its pivotal connection with the lever and supports between which such sleeve is pivoted on an axial line parallel with the pivoted axis of the lever.

1l. I'lhe combination With a control lever lor throttle valve Steins and the like of a plate upon which it is pivoted at a point removed from its end, a bearing sleeve projectingfrom said plate at a point removed from its pivotal connection with the lever and supports between which such sleeve is pivoted on an axial line parallel with the pivoted axis of the lever, the lever being in slidable contact with a portion of the plate removed from its pivotal point on the plate.

5. 'lhe combination with a control lever tor throttle valve sterne and the like, of a pivotally mounted plate upon which it is pivoted at a point removed from its end,

the pivotal being,l parallel, and means for holding; the plate in a plane perpendicular to its pivotal. axis, comprising a quadrant carried by the plate adj aeent the lever, a latch carried by the lever in engagement with the quadrant, and means mounted on the lever l'or operating the latch.

6. The combination with a control lever tor throttle valve stems and the like, of a pivotally mounted plate upon which it is pivoted at a point removed. 'from its end, the pivotal nes being parallel, the lever being,` in slidable Contact with a portion of the plate removed troni its pivotal point on the plate, a quadrant carried by the plate adjacent the lever, a latch carried by the lever in engagement with the quadrant, and means mounted on the lever for operation@1 the latch.

7. The combination with a control lever lor throttle' valve stems and the like, of a bell crank lever, a pivoted connection between the control lever and the bell crank lever at its center, a guide support in en-l gageinent with the control lever on one end oit the bell crank lever, the bell cra-nk lever beingl pivoted at its other end and held in a plane parallel to the pivotal axis ot 'the control lever.

S. The combination with a control lever for throttle valve stems and the like el a bell crank lever, a pivot connection between the control lever and the bell crank lever at its center, a guide support in engagement with the control lever on one end ot the bell crank lever, the bell crank lever being pivoted at its other end and held in a plane parallel to the pivotal axis of the control. lever, the lever being in slidable contact with a portion ol the plate removed trom its pivotal point on the plate.

ln testimony whereof, I alliX my signa ture in the presence of tivo Witnesses this 11th day of llanuary, l9l5.

@TIS W. YOUNG.

Witnesses:

LAUREL lll. Donniirne, Bessrn S. Rien.

utopica et thla patent may he obtained for tive cents each, by addressing the emmealoner of Patents., "Washington, I). tl.