US370776A - gaskill - Google Patents

Description

4 sumssheen 2. f

(NoModel.)

H. P. GASKILL DUPLEX ENGINE.

No. 370,776. Patented oct. 4, 1887,.

wimax/@M N. FErEHS, Phnwmnugmpher. washingtan. 0,0.

(N0.Moae1.)f 4-sheetssneen 11.-?. GASKILL.

DUPLEX ENGINE.

No. 370,776. Patented ont. 4,1887.

(No Model.)

4 Sheets-Sheet 4.

H. F. GASKILL.'

DUPLEX ENGINE.

No. 370,776. Ptemd ont. 4, 1887.

VVITNEESES= INVENTUF1= 7m ww/QM,

N. PETEns, Phowumognplwr, wnhngtm, D. C.

UNITED STATES PATENT Ori-ICEO HARVEY F. GASKILL, OF LOOKPORT, NEW YORK.

DUPLEX ENGINE.l

SPECIFICATION forming part of Letters Patent No. 370,776, dated October 4, 1887.

Application tiled April 11, 1887. Serial No. 234,353.

.To all whom it may concern:

Be it known that I, HARvEY'F. GAsKILL, of Lockport, New York, have invented certain new and useful Improvements in Duplex Engines, of which the following is a specification.

This invention relates to the valve motion of duplex engines. Its object is to check the motion of the pistons before they reach the cylinder-heads.

To this end the invention consists in giving A each engine of the duplex system a control over its own valve during the latter parts of its stroke, and in certain devices or combinations, all of which are recitedin the claims at the end hereof.

In the accompanying drawings I have shown so much of the steam end of a duplex engine containing my invention as is desirable for a perfect understanding thereof.

This machine consists of two cylinders side by side, their pistons and piston-rods, their valves and valve-stems, two rock-shafts, connecting devices between the rock-shafts and the piston-rods by which each piston-rod rocks one of the shafts, two arms on each rock-shaft, two levers pivoted near their middles to the valve-stems, connecting devices connecting the ends of the levers to the arms on the rockshafts, and numerous details of use in making up the finished machine.

In the drawings, Figure l is a top View of the steam end of a duplex pumping-engine, the valve-chests being removed. Fig. 2 is a side view of the same. Fig. 3 is an end view of the same, taken from in front. Figs. 4 and 5 are modied details.

A and A are the two cylinders; B and B, their respective valves; C and C', their respective valve-stems; E and E', their respective piston-rods.

N N N N are' stretchers connecting the steam-cylinders A A with the pumpcylinders, which are not shown, or other parts of the machine.

H is a piece bolted onto the two middle stretchers, and forming bearings or supports for the rock-shafts.

I and I are the two rock-shafts.

F and F are cross heads or arms, secured to 5o the piston-rods E and E', respectively.

D is an arm on rock-shaft I. G is a link vduring half a stroke.

(No model.)

connecting said arm with cross-head F on piston-rod E. D is an arm on rock-shaft I. G is a link connecting arm D with the crosshead F on piston-rod E. By means of these connections rock-shafts I and I are respectively rocked by piston-rods E and E.

K and K are arms extending upward from the ends of the rock-shaft I.

J and J are levers pivoted near their middles j and j to the valve-stems GG', and connected at their upper ends to the upper ends of the arms K and K. The valve-stems are provided with an adjusting mechanism, as shown.

L is an arm extending downward from one end of rock-shaft I. L is a similar arm, eX- tending upward from the opposite end of that rock-shaft.

M is a link connecting arm Lwith the lower end of lever J.

M is a link connecting arm L with the lower end of lever J The operation of this apparatus islas follows: Piston-rod E is at the middle of its stroke and is moving in the direction of the arrow. This moves the upper ends of the two arms K and K, and with them the upper ends of levers J and J, toward the cylinders. At the same time piston-rod E', which is at the forward limit of its motion, moves back, carrying arm D with it. This moves the lower end of arm L, and with it the lower end of lever J, toward the cylinders. Both ends of lever J are therefore moved toward the cylinders, and valve B, which is operated by J, is moved back. The parts are so adjusted that when piston-rod E reaches the end of its travel valve B is over both ports, but is immediately moved farther back, and opens the forward port by the continued motion of rod E. Rod E now starts back, and thereby moves the upper end of lever J forward, the lower end being at the same time moved backward by rod E, so that valve B is substantially stationary Thus it will be seen that valve B Qf engine A is closed bythe action ofthe pistons of both engines, and opened by the action of the piston E of the opposite engine. In a similar manner valve B is operated. Starting with the position of the engines shown in Fig. 2, the upper end of lever IfO J/ is moved back by rod E, and itslower end, aeted on by arm L', is moved forward by rod E. As the tWo ends of the lever are moving in opposite directions, its center is substantially stationary, and valve B', which is connected to its center, is also substantially stationary, and remains so until one of the pistons changes the direction of its motion. This occurs when E reaches the, end of its stroke, E being at that time at the middle of its stroke. From this point until E reaches the end of its stroke the two ends of lever J are movedin the same direction-to Wit, forwardand Valve B is closed thereby.

By means of the adjusting-screws c c (see Fig. 2) the pistons can be permitted a certain amount of travel without moving the valves, and thus the stroke can be variedeither shortened or lengthened.

In Figs. 4 and 5 I have shown modifications of the connections between the two rock-shafts and the levers J J These will be readily understood by the mechanic, as will also many other modifications which he may adopt Without departing from my invention.

l. The combination, in a duplex engine, of the valves, the valve-stems, the levers pivoted to the valve-stems, the adjusting-screws for varying the throws of the valves, and connecting devices connecting one end of each lever with one set of pistons and the other end of eaeh lever with the other set of pistons, substantially as set forth.

2. The method of regulating the motion of a duplex engine having independent pistons Consisting in causing both sets of pistons to act about equally upon both sets of valves, eausin g the pistons to offset each other in their actions on the valves during one part of the stroke, and to re-enforce each other in their actions on the valves during another part of the stroke, substantially as set forth.

3. The method of regulating the motion of a duplex engine having independently-moving pistons, consisting in causing both sets of pistons to act about equally on both sets of valves, causing said pistons to offset eaeh other in their actions on the valves during the first parts of the strokes, and to re-enforee each other in their actions on the valves during the latter parts of the strokes, substantially as set forth.

HARVEY F. GASKILL.

Witnesses:

H. H. FLAGLER, PERRY STOWELL.

Images