US906119A - Engine. - Google Patents

Description

H. BRAKE. ENGINE.

APPLICATION FILBDOGT. 11I 1906.

Pawntea Deo.8,1aos.

WJT/VESSES m w. w T T v ,UNITED sTATEs PATENT oEEroE.

nENDRroKs BRAKE, or oAMPToN,KENTUoKY, AssIGNoE 0F ONE-nALF 'ro NEvi/ToNv ALEXANDER, or o AMPToN, KENTUCKY.

` ENGINE.

Specification of Letters Patent.

PatentedDe. 8, 1908.

Application filed october 11, 190s. serial No. 338,517.

To all whom it may concern:

Be it known that I, HENDRIcKs DRAKE, a citizen of the United States, residing at Campton, in the county of Wolfe and State of Kentucky, have invented a new' and useful Engine, of which the following is a specification.

This invention relates to steam engines, and has for its principal ob'ect to provide improved means for contro ing the operation of the engine.

A further object of the invention is to provide an improved valve operating mechanism, in which eccentrics, cranks and other devices receiving motion from the main shaft are dispensed with', the piston serving at or near the completion of each stroke to shift theposition of the valve.

A still further obj ect of the invention is to provide an improved means for automatlcally reversing the engine in case of sudden increaselin theload beyond the capacity of the en ine.

A still further object of the invention is to provide a reversing or controlling mechanism which receives motion from the connect-v ing rod where the en ine is driven back by sudden excess in 'the oad.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain nove features of. construction and arrangement of parts, here- 'l inafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being A understood that varlous changes in the form,

ployed to indicate corresponding proportions, size and minor details of the structure may be made Without departing from the spirit or sacrificing any of the ad vanta 'es of the invention.

In t e accompanying drawings z-Figure 1 is a sectional elevation of a steam engine constructed in accordance with the invention. Fig. 2 is a detail perspective view of oneof the tappet arms. Y

Similar numerals of `reference aref` emarts throughout the several figures of the rawmvs.

'fhe engine is provided with a suitable base or sole plate 10, carrying a cylinder 11, and cross head uides 12.

In. the cy inder is a pisto 15 connected by `ward yielding movement.

a rod 16 to a cross head l and the latter is connected by a rod 18 to the main crank shaft.

In the steam chest is arranged an ordinary 'D-valve 20 controlling the How of steam Athrough cylinder ports 21-22, and the exhaust port 23. This valve is carried by or vconnected to a rod 24 that extends out through both ends of the steam chest, and at the crank shaft end isl connected to .a lever 26, the lower end of which carries a pin 27 extending through the cylinder head and arranged in the path of movement of the piston 15. The opposite end of the valve rod is .connected to a lever 28, the lower end of which carries a tappet pin y29 extendin through 'the rear cylinder head and dispose in the path of movement of the piston. During the operation of this portion of the mechanism, the piston is operated un der full steam pressure for nearly the Whole of the stroke, and just before reaching the end of the stroke engages with one or other of the tappet rods 27-29, and shifts the position of the valve. l

At one side of the cross-head guides, adjacent to the crank shaft end of the cylinder, is a pivot pin 30, on which is mounted a twoarmed lever 31. This lever is connected to a air of arms 32-33 that extend along paral-v extending arms which carry tappets 34 and 35-respectively. ,These tappets are held in vertical osition by small springs 36 and are arranged) to yield outwardly or in the direction of the crank shaft, but are held from in- On the connecting red 18 is a double tappet or block 38 that is arranged to engagev with the tappets 34 and 35. During-the out stroke of the piston,

while the connecting rod is moving in the direction indicated by thearrow, the tappet 34 will be engaged by the block 38, and will yieldto permit the passage of the blok and during movement of the crank shaft the reverse direction, the block will engage the tappet 35., If, however, the Work whichthe engine is called u on to perform is in excess ofl its capacity, tie connecting rod willnbe driven back andthe block 38 willengage either the tappet 34 or 35, depending on the direction of rotation of the crank shaft, and will positively move one or other of the rods At a oint near the end of the frame is pivoted a ever 40, the upper end of which is connected by a link 41 to the valve rod. The valve rod is provided with a pin 42 and the adjacent end of the link has an elongated slot 43 which will permit free movement of the valve rod as it shifts from one position to the other during the ordinary operation of the engine, without bringing the pin into engagement with the end walls of the slot 43. The lever 40 has a suitable handle, so that the lever may be manually manipulated for the purpose of reversing the engine. The lower end of this lever is connected to the lever 31 by a rod 43', the connection being such that when the valve is adjusted for movement of the engine in the direction indicated by the arrow, the ta pet 34 will be advanced in the direction of t 1e crank shaft, and the tappet 35 will be moved away from the crank shaft.` in this position the tappet 34 will be directly in the path of movement of the block 38, and will be engaged by the latter each time the crank shaft rotates. The tappet 35, however, will be out of the path of movement of the block 38, and will not 'be engaged by said block.

If the engine is driven back by excess load While the connecting rod is moving in the direction indicated by the arrow, the block 38 will come into contact with the forward face of the tappet 34 and the latter being held rigid, movement will be transmitted to the` rod 32, thereby rocking the lever 31, and this movement is transmitted through the rod 43 to the reversing lever 40, thus shifting the position of the valve 28 and reversing the engine. If on the other hand the rod is moving in the direction contrary to that indicated at the arrow, the tap et 35 will be engaged, and the reversing Ilever will be moved in the other direction to effect reversal of the direction of rotation of the crank shaft.

When the parts are .in the position shown .in Fig. 1, the valve 20 has moved to such position as to open the ort 21, so that steam is flowing into the left hand end of the cylinder, while steam is exhausting from the right hand end of the cylinder, and is passing through the cavity of the valve into the exhaust port 23. The connecting rod 18 is moved in the direction indicated by the arrow and the piston is at half stroke.

If the engine continues its ordinary operation, the iston 15 will engage the rod 27 as it nears tllfe completion of its stroke, and the position ofthe valve will be shifted, so as to open the port 21 to the exhaust and establish communication between the steam chest and the right hand end of the cylinder, in order to reverse the direction of movement of the piston.

It frequently ha pens in rolling mill operations that when t e ingot is being attacked bythe rolls, too much draft is given the latter. The result of this is a jamming of thc ingot in the rolls and it is driven back to a certain extent with the engine driving said rolls. It then becomes necessary to reverse the engine by hand so that the ingot may be drawn out from between the rolls. To obviate this manual reversion of the engine when the work which it is called upon to perform is in excess `of the capacity of the engine, and if persisted in would result in breakage of the engine or some of its connections, the piston rod instead of completing its stroke, will be forced backward and the block 38 will engage the tap et 34 and will shift the rod 32 endwise'in t e direction of the cylinder. This movement will be transmitted through the lever 31 to theconnectling rod 43, moving the latter in the .direction of the cross head and transmitting movement to the lever 40 which, in turn, will shift the valve rod 24 and valve 20 from the left, it being remembered that at this time the valve 20 is in such position that steam is entering from the chest through the port 21. When the valve 20 is shifted, however, the port 21 is placed in communication with the exhaust and communication is established between the steam chest and the port 22, so that steam is admitted to the right hand end of the cylinder before the piston completes the stroke which it has started, and before the crank in moves across the center and in this Wa t e direction of rotation of the engine wil be reversed.

'Vlhen the engine is operated in the direction indicated at the arrow, the upper tappet 34 is' arranged in such position as to be engaged b while the block 35 is drawn rearward in the direction of the 'cylinder and is out of the ath of the connecting rod and the lower lock 38 as the iston moves backward,-it being observed t at the lever 31v is centrally pivoted, 'and when one of the blocks is advanced, the other block is drawn rearward out of operative position.

` An enginleconstructed in accordance with this invention may be operated with economy owing to the reduction the number of parts in frictional contact and the automatic safety device will prevent strain or break down of the engine when the work which the engine is called upon to perform is in excess of its capacity. f

'1I claim z p 1. The combination in a steam engine, of the cylinder, a piston therein, a cross head connected to the piston, aconnecting rod, a

crank shaft, a block carried by the connecting rod, a reversing lever, and means arranged in the ath of movement of the block and connecte( to the reversing lever to effect reversal of the engine in case ofl excess load.

2. The combination in a steam engine, of

the block 38 at each revolution,

i teppet arms carried by the rods and yielde cylinder, :i iston therein, e cross head l tive positin with relation to the connecting 1u connected tot e piston, a connecting rod, a rod block.

crank shaft, e block on seid connecting rod, In testimony that I claim the foregoing as a pair of rods adjacent to the cross head, my own, I have hereto affixed my signa-ture in the presence of two Witnesses.

able in. one direction, a lever to which the -HENDRICKS RAKE. rods are connected, and an engine reversing l/Vitnesses: member connected to said lever and serving WAYNE BRYANT,

to adjust one or other of said rods to opera- LUCINDA BRYANT.

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