US1253503A

US1253503A - Valve-gear.

Info

Publication number: US1253503A
Application number: US1512315A
Authority: US
Inventors: William Mathew Leng
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-03-17
Filing date: 1915-03-17
Publication date: 1918-01-15
Anticipated expiration: 1935-01-15

Description

W. M. LENG.

VALVE GEARu APPLICATION FILED MAR. I1. I915.

w w Q Hw I HIHH I I I NMH Patented Jan. 15, 1918.

17-1 v e n I?) r.

I h I fill/Itrrllrlflllllddrrll ,MZI/QQ WW and levers as they appear after having opessence Application filed March 17, 1e15. Serial No 15,123.

To all whom it may concern:

ioivrrnn stars leaner emon itt-1AM MATHEW Lorne; or HAvELocK, on'ranro, narrate.

Be it known that I, *WILLIAM MATHEW L mo, a subject of the King of Great Britain, and resident of the town of Havelock, county of Peterborough, Province of Ontario, in the Dominion of Canada have inventedcertain new and useful Improvements in Valve-Gears, ofwhich the following is a specification. g V v y The-invention relates to improvements in .valve gears as described in the present specification and shown. in the accompanying drawings that form part ofthe same. y

The invention consists essentially in the novel construction and arrangement of parts whereby a plurality of levers are so assembled as to vary the lead according to the load. a i g The-objects of the invention are particularly" to devise an eiiicient valve gear; for locomotives so that the said locomotives may be operated successfully under the carrying conditions in which they are used and generally to provide a valve gear free from complications and of a durable nature.

In the drawings, Figure 1 is a diagrammatic view showing the relation of the levers and rods of the gear to thevalve, the latter being shown in longitudinal relation with the steam chest and cylinder.

1 Fig. 2 1s a diagrammatic view of the rods and levers as they appear after having operated the valve to give the proper lead for startingthe engine in arearward direction. Fig.3 isa diagrammatic view of the rods stated the valve to give the proper lead for starting the engine in a forward direction.

Like numerals ofreference indicate corresnon ding parts 1n each figure.

- Referring to the drawings, 1 15 the cylinder having thepiston 2 operating therein- 1 and the inlet and exhaust ports3 and 4 terseat 5. 1

minating,atthevalveseat 5.' i y 6 is the steam chest mounted at the top of the cylinder, and furnishing part of the 1 'l is a valve s'lidingon the valve seat5 withinthe steam chest 6,'-said valvebemg Specification of Letters Patent.

VALVE-GEAR.

Patented trail. is; rare.

adapted on operation to close the front or rear inlet port 3 to admlt of steam entering the cylinder through the other inlet to provide a lead accordingly as it is desired to move the locomotive in a forward or rearward direction.

The valve 7 is provided with a stem 8 projecting outwardly through the rear end .ofthe chest 6 and having flexibly connected bell crank 11 being pivotally secured at its center toa suitable bracket from the frame of the locomotiveandbeing pivotally connected at its upper end to an operating rod 12 from the cab of the locomotive.

It will at once be apparent that in operation the rod 12 accordingly as it is moved in a rearward or forward direction will raise or lower the rod 9,- the purpose for which will be explained hereinafter.

13 is a lever provided at its upper end with a. slot 14 adapted to be engaged bya headed pin 15 projecting at right angles from the rear end of the rod 9, said lever being pivotally connected at its lower end to a crank rod 16 which extends rearwardly and is pivoted to a crank lever 17 which in turn is fixed upon a shaft 18 of one of the driving wheelsof thelocomotive, a

The lever 13 is secured at a point slightly above its longitudinal center by a pivot 21 to a sleeve 19 slidablv arranged on a horizontal bracket 20 which is rigidly secured the locomotive tween the rods 22 and 23 a substantially rectangular frame 2% is rigidly mounted centrally on a shaft which in turn is suitably journaled in bearings from the locomotiveframe' V The'fra'me 24a nd shaft 25 are adapted to be rotated by means of a rod QGse cured slightly aboveand to one-sideof the center} of said frame and extending to the cab of the locomotive.

end thereof in a backward or forward motion-as the; case may be and consequently moving the-valve 7 on itsseat; and inorder to; bring this movement under the controlof the operating rod 26 toggles; 27} 52 8 and' 29 forming substantially; N-shaped level operating on two fixed pOintsBO and 3133i (opposite sides,- of the -frame '24 towardlthe ii-pper and Flower ends of said; 151211118 are preflvidedfthe toggle members 27 hand ZS hei'n-g p vota lly secured ato the points 30 and; 31 and thecentral toggle memberv29 connecting the other ends-ofsaiditoggles 27;and 28 "and itSElf-Centrallyand pivo'tallysecuredto Ftl epivot jOint 3 2 ofv said rods 22 andf23;

', .Ehe? starting of, the locomotive mayfbe greatly faci-litatecl' by, allowing a consider.-

i bl'e quantity of steam to enterthe, cylinder prior;t;o starting and as will-have been. seen bythe foregoingdescriptionin combination with the drawings aponvenient means: of varyingthe-amount of this lead andfof reiiiersingthe lead from one iinletfto another ,aGCQ rdiQg-ly as the-locomotive i to be moved in a forward or rearward direction, is pro yidedqwithout interfering with the" or clinaryvalvev operating mechanism. f Q It will be apparent that the amo uritnf lead given in either direction 1 depends upon the? distance between the point where the gums on-thesend of ftherod is located with the slot l t and the point 21 where the le+ ver 13 is pivoted to the sleeve I9;a'nd to'the radius rod 22 and this d'istance mayb'e'varied according to the load to? be-carrieh'by n eansof-the operating 'rod-12, "asffor instanceewhen fsaid rod is u'lled 'thejbell crank ll l raises the rod 9 and the pin-l5 slidestoavar d theupperend of thefsloit fl t-wand this increases the leverageof said rod 13,='wl1ile naove nent o f said rod 12 in the opposite'idirectien will of course have the effect of d ereas nggthe leverage of said rod '13." 1

;-WY;hei 1-it is desiredto move 'thelocomotive in rearward 'direetionzal'ld {L-jlEiidjlS ire-1 ql e,'Cl;-' -l1. l -Ol $26 is drawn baclrwardly pulls the inp'per endof the framefli inthe sam .i lir tion a d c using he r oe y iqur naled ends of the N-shaped member'totilt' pward y and draw the rad us, red 22, rea

wardly and as the lever 13 is secured thereto and is adapted to move in a horizontal direction by means of the sleeve 19 the said lever will carry with it the rod 9 and thus draw theevalve 7 rearwardly to" admit of steain entering the foremost inlet port. 7

:To supplytheleadfrom the rear steam inletport t0 movethe locomotive in a forto move the same direction and tocarry thc"le'ver 13 and sleeve 19 forwardlygwhrch .ward. direction the operating rod 26 is pjushed forwardly causing the radius rod 22 It will be apparent that horizontal motion impa-rtedto the

rods

22 or 23 will betrans mitted to the lever 13,-moving the upper;

inyturn pushes' the rod 9 and moves'the valve 7 to the forward end of the steam chest leaving an openingthroughthe rearrnost iii- 'leversfpivc'itallyxjoined:togetheig 'a"vaiveirqd A "adjnstahly zseciiredi toi onefoftisaid llevers,"- va crank 'rddj pivotallvisecured "totsaid-iadj list:- ingfjlelvergj afreversmg mechan sm pivotail'ly secured to said crank rod:by-onerofxsaidele oblique directions 'i'ni'relation :to: a horizontal i dra-wn'.=thr0ughf1its' center and a icraifk securedito Saidtcrank rod??? 2.; A a v al vegear comprising i a reversing mechanism: rformed; of a tilting? iframer'an'd j pivoted leversz arranged onsaid frame; Ta plurality Zdf :;r.ods Tpivotally 'j'oined to Tsai'd levers, an adjusting lever pivotally joined to onejoflsaid-a'osds; ;a cranked 'lrod iioined to the etheref said .-rodszahdito ehema of :saidiad justing ?le ver,-; a" crankrj oind to 1:-said icranl rod-and a'Y'va 1 ,od adjustable Tin :saidkalt j11i i g-lever.-- v.

A' val-ve*,qearcomprising :a reversing gear formedof a :tiltir'igwframe,1ia-?plurality points, a crank rod,- a-icrank, iaval-ve'rodga lever" adjustably =cbnn5ectin g said xtcrank ir'od to? saidva lve;ro cl;,- :a: rod pivotally connecting said crank rod'rto-saic sa1d;toggles.;;" l o v a v {441A "valve-gear coinprisingia ireversing ,2'eajr; forinfedof astil'ting franie carrying an N-shaped lever composed of'rthreetoggles J:-

operating frein two; vfixed pivoted xpointa'ia crank rod, a crank, a v;al v'e,=: a Troda: pivotall'y connecting; the central- 'toggle withi iksaid cli l k rod afn adjusting?lever'havingwa 1ongitudinal SlOiZ QiZdt-S upperien'd in JWlil'Cll S'Q i'Cl valve rods adjustedra'ndat::its :loweraend V pivotal-1y connected to said'cra'nlr-rodrza rod pivotal'lyconnect-i-ngsaidzcentralztogglwith said adjusting levelmlda slidingjgtlide160m 'zsaizd ad- K tending from said hell crank, a slotted lever said movable pivotal point and a crank opadjustably secured to the end of said valve crating said crank rod.

rod adjacent to said link connections, a re- Signed at the village of Havelock, Onta- V versing mechanism having a ivotal point rio, this 10th day of December, 1914.

movable in oblique directions in relation to the horizontal, a crank rod at the end there- WILLIAM MATHEW LENG' of directly connected to said slotted lever, Witnesses: a plurality of rods vpivotally connecting said FRANK WHITE,

slotted lever and said crank rod through MARTIN RILEY.

@opieaoi? this patent may be obtained for five cents each, by addressing the Commissioner of Jr'atenta,

Washington, a. El."