US882887A - Reversing device for engine-valves and other uses. - Google Patents

Description

PATBNTED MAR. 24, 1908.

. K, c. HOXIE.

RBVERSING DEVICE FOR ENGINE VALVES AND OTHER USES.

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- PATBNTED MAR. 24', 1908.

K. c. HOXIE. REVERSING DEVICE FOR ENGINE VALVES AND OTHER USES.

APPLICATION FILED OCT. 9; 1907.

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KINNEY C. HOXIE, OF DULUTH, MINNESOTA.

REVERSING DEVICE FOR ENGINE-VALVES AND OTHER USES.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed October 9, 1907. Seria1 No. 396,634.

To all whom it may concern:

Be it known that I, KINNEY C. HOXIE, a citizen of the United States, and resident'of Duluth, Minnesota, have invented certain new and useful Improvements in Reversing Devices for Engine-Valves and other Uses, of which the following is a specification ac companied by drawings.

This invention relates to reversing devices for engine valves and other uses, and the objects of the invention are to improve upon such devices and render them more efiicient and certain in operation, reduce the number of points at which wear may occur, and obviate the necessity of imparting motion to a valve or other device from a point moving in grcsd of a circle, thus reducing the tendency to Further objects of the invention will hereinafter appear and to these ends the invention consists of a device for carrying out the above objects embodying the features of construction, combinations of elements and ar rangement of parts having the general mode of operation substantially as hereinafter fully described and claimed in this specification, and shown in the accompanying drawings, in which,-

Figure 1 is a longitudinal elevation of a device embodying the invention partly in section; Fig. 2 is a transverse sectional view on the line 22 of Fig. 1, looking in the direction of the arrows; Fig. 3 is an end view of the device partly in section. Fig. 4 is a vertical detail sectional view taken through the controlling valve.

Referring to the drawings, D represents the bed or frame of the apparatus to which are bolted or otherwise secured the fluid pressure cylinders A, B and C, having the plungers E, F and G passing through the stuffing boxes H, I and J. I have chosen to illustrate my invention by means of three cylinders, two of which, A and B, are opposed to the third cylinder C, but I am not to be understood as limiting the invention to any particular number of cylinders. The cylinders are preferably arranged in opposed differentially acting sets, and when I speak of a set, I mean one or more cylinders. In the drawings, the cylinders A and B constitute one set and the cylinder C constitutes another set opposed thereto.

The plungers E and F of cylinders A and B are preferably of substantially the same effective area, and the plunger G of cylinder C is of greater effective area than either of the plungers E and F. For convenience of illustration, the area of plunger G may be assumed to be 3/2 E or 3/2 F, and the combined area of plungers E and F is therefore greater than that of G, although these figures need not be adhered to in actual practice.

Preferably the cylinders A and C are arran ed in alinement with each other for practica purposes, although this is not necessary, and the plungers E and G are connected together, forming a common plunger, to which is suitably screw-threaded, or otherwise secured, the movable cross head or block K. The centering cylinder B is preferably arranged above cylinder A, and the lunger F is provided with a reduced stem T. passing loosely through an aperture in the upper portion of the cross-head or block K, so that the shoulder O on plunger F may abut against said cross-head. A suitable stop P is pro.

vided for limiting the outward movement of the plunger F, against which stop the stem L abuts at the end of its movement.

R represents the casing of the reversing valve of an engine or other movable art to be actuated, for the invention is not imited to use with reversing valves. The valve stem Q may be suitably connected to one of the moving parts of the actuating device, as to the cross-head K as shown, or to the plunger E or G.

Suitable fluid pressure connections are provided for the cylinders A, B and C, wherey the admission and exhaust of fluid pressure to said cylinders is controlled.

S represents a four-way valve for controlling the cylinders, T is the inlet pipe and U is the exhaust pipe. One side of the valve S is connected by pipes V and W to the cylinders A and C respectively, the valveis connected by the pipe X to the centering cylinder B.

In Fig. 4 the details of a suitable construc.

tion of controlling valve are shown. The pipes T, V and W connect with the annular recesses 61., b and c in the casing, and a sleeve (1 is preferably inserted and held in the easing in any suitable manner, and provided with sets of perforations c registering with the recesses a, b and c. The plunger f is adapted to be moved longitudinally in the casing and control the ports. The exhaust U is connected by pipe 9 With the exhaust opening it near the top of the casing. The position of the plunger f in Fig. 4 correwhile the other side of .and other uses, the combination of a sponds to the position of the parts in Fig. 1, in which pressure in cylinder A has been released because pipe V is in free communication with exhaust port h above the plunger and pressure is supplied to cylinder 0 through pipes W and X.

The operation of the device is as follows: With the parts in the position shown in the drawings, pressure in cylinderAhas been released, while B and C. The pressure on the larger plunger G has overcome the pressure on plunger F, so that plungers E and F have been moved backward to the limit of their stroke, thus moving the cross-head K to the limit of its movement in one direction, and with it the valve stem I By restoring pressure to cylinder A, the combined pressure on plungers E and F will overcome the pressure on plunger G, thereby moving the cross-head K in the opposite direction until the stem L abuts against the stop P, which neutralizes the force on plunger F and the cross head K will be held in its central position by the opposition exerted by plunger G, which is in excess of that exerted by plunger E.

By releasing the pressure on plunger G, the force exerted on plunger E will continue to move the cross head K to the opposite end of its stroke. Upon again restoring pressure behind plunger G, the cross head will be brought to mid position, and by this means the cross head and the parts connected thereto are moved as desired.

Obviously some features of this invention may be used without others and the invention may be embodied in widely varying forms.

Therefore, without limiting the invention to the devices shown and described, Without enumerating equivalents, I claim and desire to obtain by Letters Patent the following:

1. In a reversing device for engine valves and other uses, the combination of a plurality of cylinders, two of which oppose a third, said third cylinder being larger than either of the others, means for controlling the supply and exhaust of fluid pressure to said cylinders, and means actuated by one or more of said cylinders.

2. In a reversing device for engine valves lurality of cylinders and plungers, two of Said cylinders opposing a third, and the area of the plunger of said third cylinder being greater than the area of the plungers of either of the others, means for controlling the supply and exhaust of fluid pressure to said cylinders, and means adapted to be actuated by said plungers.

3; In a reversing device for engine valves and other uses, the combination of sets of opposed cylinders and their plungers, the combined plunger area of one set exceeding pressure is applied to cylinders the plunger area of the other set, means for controlling the supply and exhaust of fluid pressure to said cylinders, and means adapted to be actuated by one or more of said plungers.

4. In a reversing device for engine valves and other uses, the combination of a movable part to be actuated, opposed sets of cylinders and plungers connected to actuate said part, means for causing one set or the other of said cylinders to predominate, thereby moving said part in one direction or the other, and means for bringing said part to rest at the mid position of its travel.

5. In a reversing device for engine valves and other uses, the combination of a mov able cross-head, a part connected to be actuated by the reversing device, a pair of opposed cylinders having differentially acting plungers connected to said cross-heads, and a third cylinder having its plunger connected to said cross-head and adapted to assist one of saidpair of plungers.

6. In a reversing device for engine valves and other uses, the combination of a movable cross-head, a part connected to be actuated by the reversing device, two cylinders having plungers connected to said cross-head and an opposed cylinder having a plunger of greater area than either of the others, connected to said cross-head.

7. In a reversing device for engine valves and other uses, the combination of a mov able cross-head, a part connected to be actuated by the reversing device, a pair of cylinders having plungers, one plunger connected fast to said cross-head and the other plunger sliding in said cross-head and having a stop to abut against the cross-head, a third opposed cylinder having a plunger of greater area than either of the others and connected fast to said cross-head and a stop to limit the outward movement of said first named plunger, thereby permitting the cross-head to slide on the plunger in its further movement.

8. In a reversing device for engine valves and other uses, the combination of two fluid pressure motors of substantially the same plunger area opposed by a third opposed fluid pressure motor of greater plunger area than either of the others, a movable member acted on by the moving parts of said motors, and means for controlling the supply and exhaust of fluid pressure to said motors in such manner that said movable member is actuated in either direction, or brought to rest at an intermediate position.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

L. H. WHIPPLE, S. W. RICHARDSON.

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