US658754A - Combined cut-off and governor. - Google Patents

Description

VNo.- 658,754. Patented Oct. 2, |900.

- F. W. BUHN.

COMBINED CUT-OFF AND GOVERNOR.

(Lpplipgtion med Har. ,13, 1900.) (No Model.)

lnunilnllnl-umm NITED STATES PATENT *FF-ICE.

FREDERICK W.'BOHN, OF INDEPENDENCE, WISCONSIN.

COMBINED CUT-OFF AND GOVERNOR.

SPECIFICATION formingpart of Letters Patent No. 658,754, dated October 2, 1900. Application filed March 13, 190i). Serial No. 8,510. (No model.)

To all whom it Lmay concern:

Be it known thatl I, FREDERICK W. BOHN, a citizen of the United States, residing at Independence, in the county of Trempealeau and State of Wisconsin, have invented a new and useful Combined Cut-Off and Governor, of which the following is a specification.

This invention relates to cut-od and governing mechanism for steam-engines in general, and more particularly to that class employed in connection with reciprocatory engines, the object of the invention being to provide a construction of this nature in which the cut-off and governing mechanisms are adapted for conjoint operation to control the admission of steam automatically to the piston-cylinder and to also provide for an independent manual adjustment of the cut-oif, so as to regulate the starting, stopping, speed, and reversal of the engine.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a plan view of the cuto and `governor. Fig. 2 is a detail perspective view of said combined cut-o and governor. Fig. 3 is an enlarged vertical section. Fig. 4 is an enlarged detail view, in side elevation, of the revoluble and slidable elements of the cut-od. Fig. 5 is a detail plan view of the cam-slotted head for the cut-off mechanism. Fig. 6 is a detail View of the valve-motion eccentric.

Referring now to the drawings, the engineshaft is shown at 50, and on this shaft is mounted a cam-slotted head 12,'held firmly in place by'any suitable means, such as setscrew 13, thus makingthe head fast for rotation with the shaft. as cylindrical in form, Witha longitudinal opening 14, and in one side of the head is a `cam-slot 15, the latter having communication with the opening. For properly contining the shiftable eccentric in operative relation to the cam-slotted head I employ a capplate 16, which is provided with a transverse enlarged opening 17 of the form shown in Fig. 4 of the drawings. The shiftable eccentric is arranged between one end of the head 12 and its cap-plate 16, as shown at 19, and this eccentric is provided with transverse slots 20, through which pass the screws This head is shown y' 21, that serve to fasten the cap-plate 16 to one end of the cam-slotted head 12. This capplate is thus made fast with'the head, to be supported thereby in a manner to loosely conne the vshiftable eccentric between the head and the plate, and as the screws 21 pass loosely through the slot-s 20 of this eccentric it is evident that the eccentric may have free play within certain limits between the head and its cap-plate. The eccentric is furthermore provided with a slot o r opening 22, which is separated from the screw-slots 20 by the intermediate bridge-bars 22a. (See Fig. 6.)

Another element of the cut-off is a slidable cam 23, which passes loosely through the opening 17 of the cap-plate and is received in the opening 14 of the head 12, and this'caln is provided with a stud or roller 24, that projects into the cam-slot 25 of the head 12, whereby the cut-off cam 23 is made to rotate with the head 'of the engine-shaft, and at the same time said cam is capable of alimited endwise movement through the head and in a direction longitudinally of the engine-shaft. This cam has working faces which are inclined to the 4axis of the engine-shaft and the slotted-head 12, and said cam passes through the slot 22 of the eccentric, so as to have the opposite cam-faces engaged by the bridge-bars 22a of said eccentric. The cam terminates at one end in a sleeve 25, which is fitted loosely on the engine-shaft, so as-to slide freely thereon,

and this sleeve is formed with an annular collar 26 and with a circumferential groove 27.

The rotary collar of the governor'is indicated at 28 as being made fast with the engineshaft at a point close to the limit of travel of the cut-o cam in one direction, and on this collar is fulcrumed the Weighted governorlevers 29, said levers being connected by the links 30 with the collar 26 on the sleeve of the governor-cam. A shifting collar 31 is loosely received in the groove 27 of the sleeve forming a part of the cut off cam, and a spring-arm 32 is provided with a fork 33, which has its ends connected loosely to studs 34 on the shifting collar 31. This arm 32 is made of inherently-elastic spring metal, so as to form a flexible connection between the governor-controlled cam and the cut-off mechanism and a shifting lever 35. Said Aarm is se- IOO cured fast to one end of the lever 35, Which is fulcrumed to a suitable end of the lever 36, which is made fast with a suitable support. Ashifting rod 38 is connected With the lever 37 and may have a handle of any form for operating it. This handle may be in the form of a lever l, pivoted to the shifting rod and toa suitable support and carrying a latch 52 for engagement with a notched segment 54 for holding the shifting rod in different positions to correspondingly hold the mechanism connected therewith. Vhen the hand-lever 5l is moved in one direction, the cam of the cut-olf is moved in one direction to change the relation of the shiftahle eccentric to the cam-slotted head l2, thereby adjusting the slide-valve through the medium of the eccentric-strap l1, mounted upon the eccentric and having connection with said valve through the medium of the usual eccentric-rod 9.

The train of operative connections between the slidable cam 23 and the lever 37 enables the engineer to adjust the cam in a manner to control the admission of steam to the piston-cylinder through the medium of the valve for the purpose of starting and stopping the engine. The cam 23 may be adjusted more or less bythe lever 37 to regulate the volume of steam to control the speed of the engine, and by moving the cam from one extreme position lo the other the engine may be reversed. All of the elements of the combined cut-01T and governor rotate with the engineshaft; but the cut-off cam is capable of a limited adjustment by the train of connections with the hand-lever, and the weighted levers of the governors are free to move under centrifugal action for the purpose of adjusting the cam to reduce the speed of the engineshaft by reducing the admission of steam when the speed of the engine-shaft becomes too high. The automatic adjustment ot' the slide cut-off cam under the centrifugal force of the governor does not altect the hand-lever 37, which may be locked in place, because the arm 32 aiords a spring or yielding connection between the cut-0E cam and the shippinglever, so that the cam may have the necessary movement under the action of the governor, While the lever 35, the link, and the lever 37 may remain stationary.

The engagement ofthe cut-off cam with the cam-slotted head and its cap-plate insures the rotation of the cam with said head and the engine-shaft, and when the parts of the cutoi rotate with the engine-shaft the eccentric is operated in amanner to shift the valve back and forth at regular intervals to control the admission and exhaust of steam to and from the piston-cylinder. Vith the cam 23 adjusted in the position opposite to that shown in Fig. l of the drawings its stud or roller ts in one end of the slot 15 of the head l2, so as to control the admission of steam for propelling the engine in one direction; but the position of this cam may be reversed by the hand-lever, so as to make its stud or roller occupy the opposite end of the cam-slot in the head l2, thus reversingthe engine, owing to the fact that the cam acts on the eccentric so as to vchange the position of the valve. This change in the position of the valve is due to the fact that the position of the cam is changed duringthe endwise movement of the 0am and bythe stud or roller traveling in an inclined length of the cam-slot between the straight terminal portions of said cam-slot. It is evident that the movement of the cut-olf cam may be varied at any point between the limits of its adjustment in either direction, and thus the cam is capable of adjustment to regulate the speed of the engine.

Changes within the scope of the appended claims may be made in the form and proportions of the parts without departing from the spirit of the invention.

What is claimed is- 1. A combined cut-olf and governol.` comprising a cam-slotted head adapted for oscillatory movement, an eccentric mounted in the head and adapted for radial sliding movement with respect to the head, a cam slidably disposed in the head and engaging the eccentric to shift it radially, a projection upon the cam engaging the cam-slot ot' the head to shift the head and therewith the eccentric rotatably, and governing elements connected with the cam.

2. A combined cut-ott and governor comprising a cam-slotted head adapted for oscillatory movement, an eccentric mounted in the head and adapted for radial sliding movement with respect to the head, a cam slidably disposed in the head and engaging the eccentric to shift it radially, a projection upon the cam engaging the cam-slot of the head to shift the head and therewith the eccentric rotatably, and means for operating the cam.

3. In a combined cut-olf and governor mechanism, the combination of a cam-slotted head, a cam slidably connected with the head, an eccentric engaging with said slidable cam for radial movement thereby, a projection upon the cam engaging the cam-slot to rotate the eccentric, and an automatic governor connected operatively With the slidable cam.

4. In a combined cut-off and governor mechanism, the combination with a cut-ott mechanism, an automatic governor connected therewith, a hand-lever, and a train of connections between an element of the cut-off mechanism and said hand-lever, said connections including an elastic link.

5. In a combined cul-olf and governor mechanism, the combination of a revoluble head having a cam-slot and a cap-plate, a radially and rotatably shiftable eccentric loosely confined between the head and cap-plate, a cam movable longitudinally of the head and having a working surface inclined to the axis of the head and in engagement with said eccentric to shift it radially, a projection upon the cam engaging the cam-slot to shift the eccentric rotatably, a governor mechanism in op- IDO IIO

erative relation to the cam, and means for the et-off, whereby it may be shifted manu- 1ov manually shifting the oam. ally o1 from the ballast-balls.

6. The combination with a rotatable shaft, In testimony that I claim the foregoing as of a cut-ofi mechanism mounted upon the my own I have hereto aiXed my signature in shaft and having a shiftable element, ballastthe presence of two Witnesses.

balls connected with the shiftable element to FREDERICK W. BOHN. shift it, a hand-lever, and a shipping-lever Witnesses: linked to the hand-lever and having a spring- PAUL N. KULIG,

arm connected with the shiftable element of JOHN F. KULIG.

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