US1034024A - Valve mechanism for hoisting-engines. - Google Patents

Description

S. T. NELSON.

VALVE MECHANISM FOR HOISTING ENGINES.

I APPLICATION FILED SEPT. 8, 1908. RENEWED DEG. 21I 1911. 1,034,024, E Patented July 30, 1912.

3 SHEETSSHEET 1.

S. T. NELSON. VALVE MECHANISM FOR HOIVSTING ENGINES. APPLIGATION FILED S PT. a, 1908. RENEWED DEG. 21, 1911.

1,034,024. Patented July 30, 1912.

'a snEma-snEET z.

-s. T. NELSON. VALVE MECHANISM FOR. HQIST ING ENGINES. APPLICATION FILED SEPT. 8, 1908. RENEWED D110. 21, 1911. 1,034,024

Patented July 30, 1912.

3 SHEETSSHEET 3.

llr

. cannot be readily gov with governor contr take steam for nearl time, it. can be oper of Chicago, county of gines are, however, qt

1,094,024.. v Application filed Septembe To all whom-it may c an Be it known that I, citizen of the United Illinois, have invented ful Improvements in Hoisting Engines, of is a specification.

The invention relat engines which must a and stopped andwit amount of work is don For economical opei gine should be provid nism arranged to admi full length of the stro it is slowly starting it maximum speed is atta is well started, the val be arranged to shorte about one-fourth of t pansion in the engin engines employedfor raising the cages or of mines, are usually 0 i type in which the valvv trolled by the governo take steam for the gre when it is slowly st speed'is attained, the ened by the automatic ernor-controlled valve reduce the steam co stroke 11 full slide valve mechanis to Well adapt it for t under which a hoistil erated.

The present inven and to provide simpl ally controlled mean the adjustable cutpfi valve or like engine stroke when starting off he reduced when, acceleration is attaine cheaper types of engi the various condition ing engine must ope consumption.

ation of Letters Patent.

. forward end ofthe slide 28 (see Figs. 1 and i s PATENT OFFICE.

LINOIS, ASSIGNOR TO. SULLIVAN MACHINERY AGO, ILLINOIS, A CORPORATION.

ISM FOR HOISTING-ENGI NES.

Patented July 30.1912.

0. 452,103. Renewed December 21, 1911. Serial No. 667.208.

The invention also seeks to provide means whereby the engineer can simltaneously control the adjustable cut-01f mechanism and the throttle valve of the engine with a single hand-lever or shifter.

The invention consists in the features of construction, combinations and arrange ments of parts hereinafter. set forth, illustrated in the accompanyingdrawings and more particularly pointed-out in the appended claims. p I, 1 7 I lathe... 'ings,Figure.1 is a view in elevation of a slide-valve engine with the present improvement applied thereto. Fig. 2 is a plan view of the same. Fig. 3 is a view in elevation on an enlarged scale of the valve mechanism with the cover of the valve chest removed and certain parts shown in central, vertical section. Fig. 4 is a view in central horizontal section-of the parts shown in Fig. 3. Fig. 5 is a detail section on line 5-5 of Fig. 4.

The engine frame 10 may be of any suitable construction. At one end it is connects ed to the engine cylinder 11 and at its opposite end it is provided with a bearing 12 for the engine crankshaft 13. A crank 14 on the shaft is engaged by a connecting rod 15 which is coupled at its inner end to a suitable cross-head 16. The cross-head (see Fig.

connected as usual to the piston 17 of 4) is the engine by a piston-rod 18. The valve chest 19 is arranged on one side of'the cylinder and is provided with asuitable valve seat 20 for a reciprocating slide-valve 21. Steam passages 22 as usual, lead from the valve seat 20 to the opposite ends of the engine cylinder 11 and an exhaust passage 23 opens through the valve seat between the ends of the steam passages 22. The slidevalve 21 is provided as usual with inlet ports 24 and exhaust'cavity 25 for controlling the flow of steam to and from the opposite ends of the cylinder. A valve-rod 26 connected to the main slide-valve 21. extends through'a stuifing-box 27 in the end wall of the valve chest 19 and is connected to a slide 28 that is guided in a suitable box the side of the engine frame. The

2) is connected by a link 3Q to the inner arm 31 of a rocker 32. The rocker 32 is moi ed upon a shaft 33 carried by a brac on the side of the engine frame. T arm 35 of the rocker is connect 1 versing lever.

36 to a block 37 which is engaged by a link 38. A pair of eccentrics 39 on the engine shaft 13 are connected by eccentric straps 40 and rods A1 to-the opposite endsof the link 38. v A cross-piece 42 on the face of the link is provided with a projecting pin 43 by which the link is connected to the re- This reversible valve mechanism 'is of the well-known Stephenson link type and need not be more fully described. Other forms may be employed without departure from the essentials of the invention.

The main slide-valve 21 is provided with outwa-rdly projecting lugs 44 (see Fig. 3)

connected to a balancing plate 45 (see Fig. 4) which is seated within a slide 46. The

latter moves upon' a suitable seat formed upon the valve-chest cover 17. A throttle valve casing 48 is mounted upon the valvechest 19 and communicates therewith, as shown in Fig. 3. A suitable throttle valve .arranged within the casing, is provided with a stem 50 which extends through a suitable stufiing box 51 and is connected to an operating crank-arm 52 that is fixed to a short, horizontal-shaft 53 journaled in lugs 54 that project from the throttle-valve casing. An arm 55 on the shaft 53 is connected by a rod 56 to an arm 57 on a shaft 58. This shaft is journaled in suitable brackets 59 and is provided with an operating hand-lever or shifter 60 by which the 68 and nuts operator may open and closexthe throttlevalve 49 to admit steam to the engine valvechest or cut off the supply thereto and thus start and stop the engine.

An auxiliary cut-off valve is employed in connection with the main slide-valve 21. Preferably,-this auxiliary cut-off valve is of the Meyer type and comprises two sections arranged on the back of the main slide valve and between it and the balancing plate 45. A valve-rod 62 for reciprocating the auxiliary valve sections 61 is provided with right and left-hand screw-portions 63 and 64 which are threaded through sleeves 65. These sleeves are headed upon their inner ends and extend through openings in lugs on the auxiliary valve sect-ions 61. Nuts 66 the outer ends of the sleeves threaded upon 65, securely clamp the same to the auxiliary valve sections 61. The valve-rod 62 extends through a stufiing-box 67 and is rotatably connected at its outer end to the inner end of a slide 68 which reciprocates in suitable guideways in the box 29. A collar 69 on the valve-rodengagesthe end of the slide are arranged within a recess 71 in the slide .and are threaded upon the end of the valve-rod. nuts 70 connect the valve-rod to the slide, so that it and the auxiliary valve-sections 61 reciprocate with the slide, but the rod 62 is free to be rotated so that the screw-threaded portions 63 and 64 thereof can adjust the other to vary der will take 'steam for .of the valve-chest a .87 on the sleeve projects the pinion or gear 81.

shifted to rotate the The collar 69 and'the Th auxiliary valve sections 61 to and from each the point of cut-oil? through the inlet ports 24 of the main slide-valve 21 which are controlled by the auxiliary valve sections 61.

A pin 72 on. the slide 68 extends outwardly through a slot 73 in the outer face of the box 29 and engages the inner endof a rod 74 that -is connected by an eccentric strap'75- (see Fig. 2) to a third eccentric upon the' engine shaft 13. The auxiliary valve sections are thus reciprocated to control the inlet ports 24of the ju'sted to and from each other by rotatin the valve-rod 62 to vary the point of cut-011 When-the valve sections are close together,

main slide-' valve 21 and these valve sectionsmay be adas shown-in the drawings, the engine cylinlength of its stroke. When the valve sections 61 are separated, the cut-off will he correspondin ly shortened. i

While the orm of auxiliary-cut-ofi valte shown is preferred, other forms may be em ployed and other means of adjustment pro vided therefor without departure from the essentials of the invention.

An auxiliary motor is provided for efi'ecting the quick adjustment of the auxiliary cut-ofi valve. In the form shown, this auxiliary motor'fcomprisesa small uprightcylinder 76 carried upon a base-plate 77 adjacent and below the head end of the main engine cylinder 11. A piston 78 in the auxiliary cylinder 76 is provided with an upwardly extending piston-rod 79 that is connected to a rack 80. This rack meshes with the teeth of a pinion 81 on the outer end of a' sleeve 82. This sleeve is rotatably mounted in a bracket 83' upon the end of the valve-chest 19, and the sleeve extends through the wall nd engages the end of the valve-rod 62. The valve-rod extends within the sleeve -and is keyed thereto ,so as to rotate with the sleeve, but the valve rod is free to,rcciproca te independ- -ently thereof. The sleeve 82 is hollow, as indicated in dotted lines in Fig. 4, to receive the end 0 "the reciprocating valve rod 62 which is keyed thereto. A solid extension end of the bracket or bearing-83 and carries or other fluid under pressure to the opposite ends of the auxiliary cylinder 77, the piston 78 and rack-barSO'may be quickly valve-rod 62 and adjust the auxiliary valve sections 61 each other to vary the point ofucut-ofi'. e engagement of the piston 78 with the ends or heads of the auxiliary cylinder 77 By admitting steam to and fromnearly the 85 out through the\ limits the relative shift of the auxiliary valve sections 61. That is to say, the heads of the auxiliary cylinder act. as stops to limit, the relative adjustment of the auxilpiston 78 is by a link 93 to the inner end of a shortarm t, the valve or lever 9 1. This arm is pivoted adjacent the engine its inner end upon a bracket or lug 95 that bout threeprojects from the auxiliary cylinder 76.

The outer end ofthe' arm 94 is provided with a pinfiti whicheittends through a slotioved apart 'Q'Tin tliEiipperend of a link 98. The link engine will 98 is pivotally connected at its lower end to f its stroke. an arm 99 on the shaft 58 to which the reme limits throttle lever or shifter 60 is connected. il rv valve In the position of the parts shown in the istable, and drawings the throttle-valve 49 is closed and #79 extends the. valve 88 is then held in position to ad- .he rack-bar mit steam to the lower end of the cylinder hrough one 76 so that the piston 78 is at the upper end 80 ith a handof its movement, as shown. and the auxilat the rackiary valve sections, 61 are close together so sections 61 that the cut-off will occur at a point near can be adthe end of the stroke of the engine piston. f the ailXil- In this position of the parts the pin 96 on is arranged the arm 9 1 will he at the upper end of the cket S3 and slot 67 as shown. To open the throttle )Yl' with the valve 49 and start the engine, the shifter or lever 60 is moved in the direction indiwithin the cated by the arrow in Fig. 3. In starting uxiliary enthe engine, the throttle-lever or shifter is e steam and moved part way to open the tm'ottle-valve. anually op- This part movement of the shifttr merely shifting the serves to take up the lost-motion between i the arm 9st and the link 98 so that the valve 88 is not shifted and the auxiliary valve T6. In sections 61 remain in position to effect a d, the valve long cut-off. hen the load is started and 'n the drawthe desired speed acquired, the operator f the cylinshifts the lever 60 to the end of its move- 100 e upper end ment to fully open the throttle-valve 49 and n 78 will he thereby, through the medium of the link 98 n, as shown and arm 94, shifts the valve to admit 'liary valve steam to the upper end of the auxiliary cylse together. 'inder 76 to shift the piston 78, separate the -valve and auxiliary valve sections 61 and shorten the steam for cutoff. lVhen the shifter 60 is moved back oke. After to the position shown in the drawings to mined, the close the throttle-valve and stop the engine,

to connectthe valve 88 also will be shifted to admit cylinder 76 steam to the lower end of the auxiliary cylwer end to 'inder, raise the piston 78 and bring the auxe piston 78 iliary valve sections together. The parts and the auxiliary val g means to will then be in position to admit steam for 50 separate the sections e auxiliary the greater part of the stroke of the engine valve and therebyqu en the cutwhen it is again started. off to the desired mi 11 this way While only a single engine is shown, it the engine may he s y and ecowill be understood that, as usual in this nomically employed ng engine. class of machine, the engine will be arranged 55 The valve mechanism et that the in duplicate at opposite ends of the shaft 13 engine will quickly s load and, with cranks on the shaft arranged 'at an anwhen the load isstar e work regle of ninety degrees to each other, so that quired of the engine duced, the there will be no dead center and the ensteam consumption i. n and the gines may be started from any position. 60 steam economically expansion The constructions of bot-h engines will be 12a inthe engine cylinder alike and the shaft 58 will be provided with The valve 88 of the engine cyltwo arms 57 for controlling the throttle inder 76 is preferably 0 from the valves of the two engines and withtwo arms throttle-lever orshif I this pur- 99 for controlling the adjusting mechanism connected for the auxiliary cut-off valves. The shaft, 1 0

iary valve sect-ions.

at the upper end of sections are close to cylinder will take quarters'of its strok is at the lower end o iliary valve sections and the point of en be reduced to about 10 The points of cut-o of the, relative shift sections 61. are pre for this purpose th through lugs 8d on t 5 80 and is adjustably of the. lugs and is wheel 85 on its upp bar 80 and the aux operatively connect 20 justed relative to th iary engine. The r within a guide 86 u is held thereby aga piston-rod 7'9.

25 A. slide-valve 8S steam chest 89 of t gine cylinder 76 and exhaust passages 00 erative means are pr 30 valve 88 to thereby c or other motive flui site ends of the am starting the engine 1 '88 will be positioned 35 ings, to connect the der to the steam sup to the exhaust, so th shifted to its upper; in the drawings, an

40 sections 61 will he a Then, on opening t starting the engine, nearly the full lengtl the desired speed 11 45 operator, by shifting the upper end of the to the source of suppl the. exhaust, can quicl however, will have but a single controlling lever on shifter 6;), so that the throttle valves and adjusting devices for the cutoff valves of both engines may be simultaneously controlled. Y

' .Itis obvious that numerous changes may be made from the details set forth without departure from the invention as defined in the claims.

I claim as my invention 1. In. a hoisting engine, the combination with the engine cylinder, of a main valve therefor, an auxiliary cut-ofl valve, means operated by the engine for reciprocating said main and cut-oil" valves, means for adjusting said cut-otf valve to vary the point .-of cut-01f, an auxiliary motor for throwing said adjusting means to the opposite ends of its movement, and manually operated devices c'ontrolling'the operation of 'said auxiliary motor, substantially as described.

2. In 'a hoisting engine, the combination with the engine cylinder, therefor, an auxiliary cut-ofi' valv*, means operated by the engine for reciprocating said main and cut-oil valves, means for ad justing said cut-01f valve tovary the point of cut-ofl, an auxiliary engine cylinder, a piston therein operatively connected to said adjusting means, stopping means limiting the throw of said piston and said adjusting means and a manually operated valve mechanism controlling the flow of fluid under pressure to and from said auxiliary cylinder. substantially as described.

3. In a hoisting engine the combination with the engine cylinder, of a main slide valve therefor having inlet and exhaust ports, an auxiliary cut-otl' slide valve on the back of saidmain slide valve and controlling the inlet ports thereof, reversible valve operating mechanism for reciprocating said main slide valve, operating means for reciprocating said auxiliary slide valve, means for adjusting said'slide valve relatively to its operating means to vary the pointof cut-oll, an auxiliary engine cylinder, a piston therein operatively connected to said adjusting means to throw the same to the opposite ends of its movement anda manually operated valve controlling the flow ,of motive fluid to and from said auxiliary. cylinder. substantially as described.

it. In a hoisting engine, the combination with the engine cylinder. of a main valve thm'ei'm'. operated by the engine for reciprocating said main and cut-oil valves, means for adjusting said cut-oft" valve to vary the point of cut-o-fi', an auxiliary engine ton therein, adjust-ableoperating connections between said piston and the adjusting means for said auxiliary cut-ofi' valve, and a manually operated valve mechanism controlling the flow of motive fluid of a main valve .tions between said piston an auxiliary cut-oti' valve, meanscylinder, a pis-- to and fromsaicl auxiliary cylinder, substantially as described.

5. In a hoisting engine, the combination with the engine cylinder, of a main valve therefor havinginlet and exhaust ports, an auxiliary valve comprising two sections con-' trolling the inlet ports of said main valve, means driven by the engine for reciprocating said main and auxiliary valves, and auxiliary motor, reciprocating means operated thereby for adjusting the sections of said auxiliary valve to and from each other to vary the point of cut-ofi, stopping means a limiting the throw of said piston'and said adjusting means and manually operated devices for controlling said auxiliary motor, substantially as described. 4

6. In a hoisting engine, thecombination with the engine cylinder, of a main valvetherefor having inlet and exhaust ports, an auxiliary valve'comprisin two sections con-' trolling the inlet ports 0% said main valve,

reversible valve operating mechanism for reciprocating said main valve, operating means for reciprocating said auxiliary valve, an auxiliary cylinder,a piston therein,means operated by said piston for adjustng said auxiliary valve sections to and from each other, and manually operated valve mechanism controlling the flow of motive fluid to and from said auxiliary said valve sections to the opposite ends of their adjustment, substantially as described. 7. In a hoisting engine, the combination with the engine cylinder, of a main valve. 100

therefor having inlet and exhaust ports, an auxiliary valve comprisin two sections controlling the inlet ports 0% said main valve, means driven from the engine for reciprocating said mainand auxiliary valves, means 105 for adj rating said auxiliary valve sections to and from each other, an auxiliary engine cylinder, a piston therein, adjustable connecand said adjusting means for said auxiliary manually operated valve mechanism for said auxiliary cylinder, substantially as described. c S. In a hoisting engine, the combination with the engine cylinder, valve t l1e1 -efor ,bavinginlet and exhaust ports. reversible valve operating mechanism for reciprocating said valve, an auxiliary cut-off valve comprising two'sections on the back of said main inlet ports thereof, a rotatable valve rod having right and left hand screw portions threaded respectively through said auxiliary valve sections, means driven by the engine for reciprocating said iary motor, means operated thereby for rotating said valve rod and manually operated devices controlling said auxiliary motor, substantially as described.

cylinder to throw valve sections and 110.

of a main slide 1-15 valve and controlling the valverod, an auxil- 9. In a hoisting engine, the combination 130.

, threaded respectively throng pinion, an auxiliary cylinder inlet ports thereof, a rotat cut-off valve comprising two threaded respectively throng with the engine cylinder, 0 valve therefor having inle ports, reversible, valve opera for reciprocating'said valv cut-off valve comprisingtwo back of said main valve and inlet ports thereof, a rotat having right and left-hand valve sections, means driv'ei for reeiprocating said valve part, to which said valve r auxiliary engine cylinder, operati vely connected to saic to throw said valve sections ends of their adjustment, a ated valve mechanism for cylinder, sultvstantially as d 10. In a hoisting engine, with the engine cylinder, 0 valve therefor having inl ports, reversible valve opera for reciprocating said valv cut-oli' valve comprising tw back of said main valve and inlet ports thereof, a rotat having right and left hand threaded respectively throu g valve sections, means drive for reciprocating said valve part to which said valve r auxiliary cylinder, a piston able connections between s aid rotatable part and ma valve mechanism for said an, substantially as described.

ll. In a hoisting engine, with the engine cylinder, valve therefor having nle ports, reversible valve opera for recipro'ating said valv back of said main; valve and inlet ports thereof, a rotat having r ght and left hand valve sections, means drive for reciprocating said valve sleeve to which said valve pinion on said sleeve, a rael in connected to said rack an erated valve mechanism for cylinder, substantially as de 12. Ina-hoisting engine, t with the engine cylinder, 0 valve therefor having inle ports, reversible valve opera for reciprocating said valv cut-oil valve comprising two back of said=main valve and having rightandleft hand threaded respectively thro mry valve sections, means tially as described.

engine for reciprocating said valve rod, a rotatable sleeve to which said valve rod is keyed, a pinion on said sleeve, a rack engaging said pinion, an auxiliary cylinder, a piston therein having a piston rod ad ustably screw threaded to said rack and a manually operated valve for said auxiliary cylinder, substantially as described.

13. In a hoisting engine, the combination with the engine cylinder, of a main valve therefor, an auxiliary cut-off valve, operating means driven by the engine for reciproeating said main and auxiliary valves,

means for adjusting said cutoff valve rela: tively to its operating means to vary the point of cut-off, a throttle valve for the engine, a manually operated shifter for said throttle valve, and means operated by said shifter for actuating the adjusting means for said auxiliary cut-ofi valve, substantially as described.

14. In a hoisting engine, the combination with the engine'cylinder, of a main valve therefor, an auxiliary cut-off valve, operating means.driven by the engine for reciprocating said main and'auxiliary valves, means for adjusting said cut-oil" valve relatively to its operating means to vary the point of cut-oft, a throttle valve for the engine, a manually operated shifter for said throttle valve, and: a motor controlled by said sh fterafter a predetermined part movement thereof for throwing said adjusting means, substantially as described.

15. In a hoisting engine, the combination with the engine cylinder, of a main valve therefor, an auxiliary cut-off valve, operating means driven by the engine for reciprocating said main and auxiliary valves, means for adjusting said cut-off valve relatively to its operating means to vary the point of cut-off, a throttle valve for the engine, a manually operated shifter for said throttle valve, means operated by said shifter for actuating said adjusting means and means for adjustin said auxiliary cut-ofl' valve independently of said shifter, substan- 16. In a hoisting -engine, 'the. combination with the engine cylinder, of a main valve therefor, an auxiliary cut-off valve, operatmeans driven by the engine for reciproeating said main and auxiliary valves,

means for adjusting said cutvalve relatively to its operating means to vary the point of ctit-otl', a throttle valve for the engine, a manually operated shifter for said.

throttle valve, an auxiliary motor foragtu' ating said adjusting means and means operated by said shifter for controlling said motor, substantially as described.

17. In a hoisting engine, the combination I with the engine cyl1nder,-of a main valve therefor, an auxiliar cut-oil valve, operatmg means driven y the engine for reciprocating means for adjusting said cut-off valve relatively to its operating means to vary the point of cut-ofi, a throttle valve for the engine, a manually operated shifter for said throttle valve, an auxiliary engine cylinder,

a piston therein oper'atively connected to said adjusting means, a controlling valve for said cylinder and lost motion, operating connections between said valve and said shifter, substantially as described.

18. In a hoisting engine, the combination with the engine cylinder, of a main valve therefor, an auxiliary cut-off valve, operating means driven by the engine forreciproeating said main and auxiliary valves, means for adjusting said cut-olf'valve relatively to its operating means to vary the point of cut-ofi, a throttle valve for the engine, a

manually operated shifter for said throttle valve, an auxiliary engine cylinder, 3, piston therein, adjustable operating connections between said piston and the adjusting means for said auxiliary cut-elf valve, .valve mecha nism controlling the flow of motive fluid to and from said auxiliary cylinder and operating connections between said valve mechanism and said shifter,

substantially as described.

1'9. In a hoisting engine, the combination with the engine cylinder, of a main valve therefor having inlet and exhaust ports, an auxiliary valve comprising two sections controlling the inlet ports' of said main valve,

means driven by thee'ngine for reciprocating said valves, a throttle valve for the engine,

a a manually operated shifter for saidthrotv trolling the inlet means driven by the engine for reciprocattle valve and means operated by said shifter for adjusting said auxiliary cut-off valve sections to and from each other to vary the point of cut-ofi', substantially as described.

20. In a hoisting engine, the combination with the engine cylinder, of a main valve ing said valves, a throttle valve fonthe engine, a manually operated shiftef for said throttle valve, means actuated by said shifter ter a part movement thereof for adjusting sai cut-otf valve sections to and from each said main and auxiliary valves,

throttle valve,

, piston therein,

engine, a

othertovary the point of cut-ofi, and means for adjustingsaid, valve sections independently 'of said shifter, substantially as described.

.22. In a. hoisting en e, the combination with the engine cylin er, of a main valve therefor having inlet and exhaust ports, an' auxiliary valve comprisin twosections controlling theinlet ports ,0? said main valve,

means driven by the engine for reciprocat ing said valves, a throttle valve for the engine, a manually operated, shifter for said an auxiliary, motor, means operated thereby for adjusting said cut-off valve sections to and from each other to var the point, of cut-01f and means for contro 1 ling said auxiliary motor operated -by-'said shifter, substantially as describedi i 23.,In a hoisting engine, the combination with ,the engine'cylinder, ofa main valve therefor having inlet and exhaust orts, 'an

auxiliary valve comprising two sec Ions controlling the inlet ports 0 ing said valves,

throttle valve, an auxiliary engine cylinder,- aplston therein,

said main valve, means driven by the engine for reciprocatathrottle valve for the eng ne, a manually operated shifter for said means operative y .con-

nected to said piston for adjustingv said cut- 01f valve sections to and from each other,

and valve mechanism for said auxiliary cyl connected to said shifter,

inder operatively substantially as described. I

24. In a hoisting engine, the-combination with the engine cylinder,- of a main valve therefor having inlet and exhaust ports, an

auxiliary valve comprising two sections cona trolling the inlet ports of said main valve,

means driven by the engine for reciprocating said valves, a throttle valve for the engine, a manually operated shifter for said throttle valve, an auxiliary to said piston valve sections to and from eachother, controlling-valve mechanism for. said auxiliary cylinder and lost motion operative. connec- 1105 engine cylinder, a means operatively conne'cted for ad usting said cut-off.

ljio

tions between said valve mechanism and said shifter, substantiallyv asdescribed, i 25. In a hoisting engine, the combination with the engine cyl1nder,'of therefor having inlet and. exhaust ports, an

auxiliary-vali e comprisin trolling the inlet ports 0 said main valve,

means driven by. the engine for reci rocat-' mg said valves, a throtQe valve or the said throttle yalve,

a main valve two sections coninanually opeigated. shifter for a n auxiliar n cylinder, piston therein, eans operatively connect' to said piston r adjusting said cut-01f valve sections to an said connecting means efi'ect an independenta valve sections, contmllin Ive mechanism from each other-, g adjustable v tment of isaidj- .said shifter after a predeterini with the engine cylinder, of a. nr

for said auxiliary engine and co between said valve mechanisma shifter, substantially as described.

26. In a hoisting engine, the con valve having inlet and exhaust} versible valve operating-mechanisi by the engine for reciprocating so an auxiliary cut-ott' slide valve co two sections on theback of said in, and controlling the inlet. ports tl rotatztble valve rod having right hand screw portions engaging said 1 valve sections, means driven by th for reciprocating said valve rod, a member td which said valve rod is throttle valve for the engine, a sh said throttle valve, and means op said shifter for rotating said mem stantially as described.

2?. In a hoisting engine, the cor with the engine cylinder, of a in valve having inlet and exhaust 1 versible valve operating inechanisi by the engine for reciprocating sa an auxiliary cnt-otf slide valve co two sections on the back of said in and controlling the inlet ports tl rotatable valve rod having right hand screw portions engaging said valvesections, means driven by tl for reciprocating said valve rod, a member to which said valve rod is throttle valve for the engine, a Si said throttle valve, and ineansop movement thereof for rotating said substantially as described.

9P1. In a hoisting engine, the co. with the engine cylinder, of a in \alve having inlet and exhaust versibl valve operating inta-hanis by the eng ne for reciprocating +=a an auxiliary cut-off slide "valve, c two sections on the hack of said to and controlling the inlet ports t rotatable valve rod having right hand screw portions engaging said valve sections, means driven by t for reciprocating said valve rod, a member to which said valve rod i throttle valve for the engine, a Si said throttle valve, an auxiliary e inder, a piston therein operatively I to said rotating member and c valve mechanism for said auxiliar operatively connected to said shi stantially as described.

-29. In a hoisting engine, the co with the engine cylinder, of a-m valve having inlet and exhaust versible valve operating meehanis by the engine for reciprocating s. an auxiliary eut-off slide valve, 0 two sections on the back of said and controlling the inlet ports thereof, a rotatable valve ifod'liaving right and left hand screw portions engaging said auxiliary valve. sections, means driven by the engine for reciprocating said valve rod, a rotatable member to which said valve rod is keyed, a throttle valve for the engine, a shifter for said throttle valve, an auxiliary engine cylinder, a piston therein, adjustable operating connections between said piston and said rotatable member, a controlling valve for said auxiliary cylinder, and operating, lost motion connections between said valve and said shifter, substantially as described.

30. In a hoisting engine, the combination with the engine cylinder, of a throttle valve therefor. a shifter for said valve, a main slide valve having inlet and exhaust ports, reversible valve operating mechanism driven by the engine for reciprocating said valve, an auxiliary cut-off slide valve comprising two sections on the back, of said main valve and controlling the inlet ports thereof, a rotatable valve rod having right and left hand screw portions engaging said auxiliary valve sections, ineans driven by the engine for reciprocating said valve rod, a rotatable sleeve to'which said valve rod is keyed, a pinion on said sleeve, a rack engaging said pinion, an auxiliary engine cylinder, a piston therein connected to said rack and controlling alve mechanism for said auxiliary cylinder connected to said shifter, substantially as described.

31. In a hoisting engine, the combination with the engine cylinder, ofa throttle valve therefor, a shifter for said valve, a main slide valve having inlet and exhaust orts, reve *sible valve operating mechanism riven by :the engine for reciprocating said, valve, an auxiliary cut-off slide valve comprising two sections on the back of said. mainvalve rotatable valve rod having right and left hand screw portions ngaging said auxiliary valve sections, means driven by the engine for rec procating said valve rod, a rotatable sleeve to which said valve rod is keyed, a pinion on said sleeve, a rack engaging said pinion, an auxiliaryengine cylinder, a piston therein adjustably connected to said cylinder and operating, lost-motion connec tions between said valve and said shifter, substantially as described.

In a hoisting engine, the combination with the engine cylinder, of a main valve therefor having inlet and exhaust ports, an auxiliary cut-off valve controlling the inlet ports of said main valve, operatin main and cut-off valves, an auxiliary motor, meansoperateid thereby for adpistmg said cutoff valve relatively to its opera-ting means to vary the point of cut-ofi and means and controlling the inlet ports thereof, a

rack, a controlling valve for said auxiliary means driven by the engine for reciprocating said.

with the engine cylinder,

dependently of said manually operative valve mechanism con- 36. In an engine, the combination with the engine cylinder, driven from the engine controlling the ad'- mission and exhaust of motive fluid to and from said cylinder, a shiftable member for varying the point of cut-off of said valve mechanism, a throttle valve for the engine, a manually operated shifter for said throttle valve, and means operated by said shifter after a predetermined part movement thereof for actuating said cut-off adjusting member.

' 37. In an engine, the combination with the engine cylinder, of valve mechanism driven from the engine for adjusting said cut-off valve independently of said auxiliary motor, substantially as described.

33. In a hoisting engine,

the combination of a main 'slide valve therefor having inlet and exhaust ports, an auxiliary cut-off valve comprising two sections on the back of said main slide valve and controlling the inletports thereof, means driven by the engine for reciprocating said valves, an auxiliary-engine comprising a cylinder and a piston in said cylinder, means operated by said piston to. adjust said auxiliary "alve ,sections to and from each other to vary the pointof cut-ofl", means for adjusting said valve sections inauxiliary engine and controlling the admission said cylinder, a shiftablemember for' varying the point of cut-off of said valve mechanism, a throttle valve for the engine, a manually operated shifter for said throttle valve, an auxiliary motorfor actuating said outofi adjustingmember, and means actuated by said throttle valve shifter for controlling said motor.

38. In an engine,

the engine cylinder,

trollingfithe flow of motive fluid to and from said' auxiliary engine, substantially as described. A

34. In a hoisting engine, the combination with the'engine cylinder, of valve mechanism therefor driven by the engine, a shiftable member for changing the point of cutofl of said valve mechanism, an auxiliary motor cylinder, a piston therein,-adjustable operating connections between said piston and said cut-off adjusting member for throwing the latter to the opposite ends of its movement, valve mechanism controlling the flow of motive fluid to and from the op-' positc ends'of-isaid auxiliary cylinder, and a hand lever connected to said valve mechanism.

In an engine, the combination with the engine cylinder, of valve mechanism driven from the engine controllin the admission and exhaust of motive fluid to and from said cylinder, a shiftable member for varying the point of cut-oif of said valve mechanism, a. throttle valve for the engine, a manually operated shifter for said throttle valve,. and means operated by said shifter for actuatingsaid cut-ofl adjusting member.

the combination with of valve mechanism mission and exhaust of motive fluid to and from said cylinder, a shiftable member for varying the point of cut-oil of said valve a manually. throttle valve, an auxlliary engine cylinder, a piston therein operatively connected to said cut-oil adjusting member, controlling motion, operating connections between said shifter and said valve mechanism, whereby the valve mechanism of said auxiliary cylinder is operated after a pre-determined part movement of said throttle valve shifter, substantially as described.

, SVEN T. N ELSON.- Witnesses:

HARRY L. OLAPP, CLARA A. 'NpRroN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 03 a and exhaust of motive fluid to and from valve mechanism for said cylinder, and lost of valve mechanism 'driven from the engine controlling the admechanism, a throttle valve for the engine, operated shifter for said

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