US1192843A

US1192843A - Valve-gear.

Info

Publication number: US1192843A
Application number: US2515315A
Authority: US
Inventors: John C Bird
Original assignee: UNION STEAM PUMP Co
Current assignee: UNION STEAM PUMP Co
Priority date: 1915-05-01
Filing date: 1915-05-01
Publication date: 1916-08-01
Anticipated expiration: 1933-08-01

Description

J. C.-BIRD.

VALVEVGEAR.

APPLICATlON FILED MAYL'I9I5- 1 1 92,843.- Patented Aug, 1, 1916.

3 SHEETS-SHEET I.

ATTORNEYS J. C. BIRD.

VALVE GEAR.

APPLICATION FILED MAY 1. 1915.

Patented Aug. 1, 1916.

3 SHEEIS-SHEET 3- W/ T/VESSES:

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JOHN C. BIRD, OF BATTLE CREEK, MICHIGAN, ASSIGNOB TO UNION STEAM PUMP COMPANY, OF BATTLE CREEK, MIGIIIGAN.

VALVE-GEAR.

Application filed May 1, 1915. Serial No. 25,153.

To all whom it may concern:

Be it known that I, JOHN C. BIRD, a citizen of the United States, residing at Battle Creek, Michigan, have invented certain new and useful Improvements in Valve-Gears, of which the following is a specification.

This invention relates to improvements in valve gears.

My improvements are especially designed by me for use and I have shown the same embodied in a single, direct acting steam pump. .Iy improvements are, however, desirable and readily adapted for use in other relations.

The main objects of my invention are: First, to provide an improved valve gear in which the steam valves are positively operative. Second, to provide an improved valve gear which prevents the parts becoming so positioned as to cause them to hang up or fail to operate when steam is turned on. Third, to provide an improved valve gear which insures a quick action of the auxiliary piston or main valve actuating piston. Fourth, to provide an improved valve gear having these advantages which is simple and durable in structure.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in which:

Figure I is a perspective view of a single, direct acting steam pump embodying the features of my invention, the pump cylinder being omitted. Fig. II is a detail view, partially in longitudinal section, on a line corresponding to line 22 of Fig. IV. Fig. III is a detail horizontal section on a line corresponding to the broken line 33 of Fig. IV. Fig. IV is a detail vertical transverse section on a line corresponding to the broken lines l1 of Figs. II and III. Fig. V is a detail transverse section through the valve gear on a line corresponding to line 55 of Fig. II. Fig. VI is a perspective view of the auxiliary valve actuating Specification of Letters Patent.

Patented Au. 1, 1%16.

lever. Fig. VII is a detail vertical section on a line corresponding to line 77 of Fig.

V. Fig. VIII is a detail side elevation of a transverse'section on a line corresponding to line 99 of Fig. VIII.

In the drawings, similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawings, the main cylinder 1 is mounted on a suitable base or supporting pedestal 2.

3 represents the head of a pump cylinder which is connected to the cylinder 1 by a suitable yoke or frame 4:. The main piston 5 is provided with a piston rod 6 which extends through the head 3 of the pump cylinder, the pump piston being commonly mounted thereon.

Above the main cylinder 1 is a valve piston cylinder and valve chamber 7 the cylinder having piston bores 8 at each end and a valve chamber 9 between. The valve chamber 9 is connected to both ends of the main cylinder 1 by the passages 10. The valve chamber 9 is provided with an exhaust passage 11 located between the passages 10, see Fig. II.

The main valve 12 is of the sliding flat or D type and has a forked arm 13 engaging the rod 14 which connects the heads of the valve piston 8, the rod having collars 15 at each side of the arm 13. Thevalve 12 is provided with ports 16 adapted to be brought into register with the passages 10. The valve has a central port 17 which is continuously connected with the exhaust port 11 and when in one position connects one passage lO with the exhaust and when in the other position the other passage so that the passages 10 alternately serve as inlet and exhaust, passages for the main cylinder.

The piston valve cylinder is connected at 18 to a suitable steam supply which may be controlled manually or by a governor, as desired.

sage 21 delivering into the exhaust passage 11, see Fig. TV. This auxiliary valve casing 19 is connected by passages 22 to each end of the valve piston cylinder. The auxiliary valve 23 is of the sliding type and is provided with a port 24 adapted to alternately connect the passages 22 with the exhaust passage 21 of the auxiliary valve, the valve being arranged so that when one passage 22 is connected to the exhaust the other is connected to the live steam.

Preadmission ports 22, shown by dotted lines in Fig. TH, connect the auxiliary valve chamber with the extreme ends of the valve piston cylinder so that steam is admitted thereto to start the valve piston and prevent its hanging up at either end of its stroke. When the auxiliary valve is in either extreme position, it covers the preadmission port at that end so that the valve piston is cushioned at the end of its stroke.

The auxiliary valve 23 is provided with a valve stem 25 arranged through suitable packing glands 26. The valve piston 8 is provided with a piston rod 27.

In operation the main cylinder valve piston is controlled by the auxiliary valve and the auxiliary valve is in turn actuated and controlled by the main or work piston and the valve piston.

On the yoke 4 is a bracket 28 carrying a spindle 29 on which a member 30 is mounted for oscillating movement. This member 30 is connected to the rod 27 of the valve piston by the wrist pin 31 so that it is oscillated by the reciprocationof the valve piston. The auxiliary valve actuating lever 32 is mounted on the pivot 33 carried by the oscillating member 30, the pivot 33 being arranged eccentrically relative to the pivot 29 of the member 30. The lower end of the lever 32 is slotted at 34 to engage the pin 35 on the piston rod 6 so that as the piston rod reciprocates the lever 32 is actuated or rocked on its pivot 33. The pin 35 is secured to the red by a clamp 36 and the clamp is provided with an arm 37 slotted to en age the slide 38, see Fig. V. This relieves the clamp of undue strain and prevents the parts becoming disarranged.

The lever 32 is provided with a tappet engaging portion 39 adapted to coact with the tappet blocks 42 on the valve stem 25. These tappet blocks are retained upon the valve stem by means of the nuts 41. The tappet blocks are shouldered to provide the lever engaging parts 42. The bracket 28 has an overhanging slide way 43 for the tappet blocks, while the lever is provided with a curved bearing support 44 for the tappet members concentric with its pivot 33. The pivot 33 is keyed to the oscillating member 30 by means of the pin 45.

"With the parts thus arranged the operation of the device is as follows: The main piston is shown at the end of its instroke and the valve piston is shown in motion, having moved a short distance from its extreme right hand position. In the position shown, the auxiliary valve is nearly at its thereby shifting the main valve to admit steam to the inner end of the main cylinder and to connect the outer end thereof with the exhaust. The movement of the valve piston through the connections described imparts a further movement to the auxiliary valve. The movement of the main piston has shifted the auxiliary valve through th lever connection described and the outer end of the valve cylinder is thus connected with the exhaust ane the inner end with the live steam. This again actuates the valve piston and the movement of the valve piston further actuates the auxiliary valve. This arrangement of parts insures that the auxiliary valve shall be fully and quickly opened preventing dragging or lagging of movement of the valve piston and main valve controlled thereby and consequently of the main piston. With the parts thus arranged it is quite impossible for the valves and pistons to become so positioned that the pump will become inoperative or hang up when steam is turned on, that is, for them to become positioned so that the auxiliary valve will be in a central position and cover both passages 22.

It is found in practice that the valve piston will occasionally, owing to defective packing for the pistons or other causes, creep and thus bring the parts to a central position. However, by arranging the parts as described, the movement of the valve piston is imparted to the auxiliary valve so that that is shifted fully so that the piston com pletes its full stroke, this insuring that the parts come to rest in such position that when steam is again admitted the pump starts promptly.

In the modified structure shown in Figs. VIII and IX, the parts are adapted to structures in which it is necessary for the actuating lever to be arranged on the out side of the connecting frame for the main and pump cylinders. In the embodiment shown the connecting frame consists of a number of rods 47, only one rod being shown.

The bracket 48 is mounted on the frame rod 47 and provided with a bearing 49 for the shaft 50 of the oscillating member 51 Lil which is connected to the auxiliary piston rod 27. The shaft 50 has an eccentric portion 52 on which the lever &6 is mounted. The operation of the parts is the same as in the structure previously described. The lever is actuated by an arm 53 on the main piston red, the arm being supported by a rod 54: arranged parallel with the piston rod, see Fig. IX.

I have illustrated and described my improved valve gear in the form in which I have embodied the same for the market. The structure illustrated is substantially that known on the market as the Burnham pump. 1 have not attempted to illustrate or describe the structural changes or variations which might be required or desirable in adapting my improved valve gear to other structures, as I believe the disclosure made will enable. those skilled in the art to which my invention relates to embody or adapt the same as may be desired. I desire, however, to be understood as claiming my improvements specifically in the form illustrated as well as broadly within the scope of the appended claims.

Having thus described my invention,what I claim as new and desire to secure by Letters Patent is:

1. In a valve gear, the combination of a main cylinder, a main piston provided with a piston rod, a valve casing and a valve piston cylinder connected to said main cylinder and provided with an inlet and an exhaust, a valve piston provided with a piston rod, a main valve controlling the inlet and exhaust of said main cylinder actuated by said valve piston, an auxiliary valve casing connected to said valve piston cylinder and provided with an inlet and an exhaust, an auxiliary valve controlling the inlet and exhaust of said valve piston cylinder, said auxiliary valve being provided with a valve stem, a pivotally supported oscillating member connected to said valve piston rod, an auxiliary valve actuating lever pivotally mounted on said oscillating member eccentrically of its pivot, operating connections for said main piston rod and lever, and tappet blocks on said auxiliary valve stem with which said lever coacts whereby the auxiliary valve is given an initial movement by the main piston and a further movement by said valve piston.

2. In a valve gear, the combination of a main cylinder, a main piston provided with a piston rod, a valve casing and a valve piston cylinder connected to said main cylinder and provided with an inlet and an exhaust, a valve piston provided with a piston rod, a main valve controlling the inlet and exhaust of said main cylinder actuated by said valve piston, an auxiliary valve casing connected to said valve piston cylinder and provided with an inlet and an exhaust,

an auxiliary valve controlling the inlet and movement by said valve piston.

3. In a valve gear, the combination of a main cylinder, a main piston provided with a piston rod, a valve piston cylinder, a valve piston provided with a piston rod, a main cylinder valve controlled by said valve piston, an auxiliary valve for controlling said valve piston, said auxiliary valve being provided with a valve stem, a supporting bracket, a member pivotally mounted on said bracket for oscillating movement, said member being connected to said valve piston rod to be actuated thereby, an auxiliary valve actuating lever pivotally mounted on said member eccentrically of its pivot, operating connections for said main piston rod and lever, and tappet blocks on said auxiliary valve stem coacting with said lever, said backet being provided with a slide bearing for said blocks, said lever being provided with a curved bearing support for said tappet blocks.

a. In a valve gear, the combination of a main cylinder, a main piston provided with a piston rod, a valve piston cylinder, a main cylinder valve piston provided with a piston rod, an auxiliary valve for controlling said valve piston, said auxiliary valve being provided with a valve stem, a supporting bracket, a member pivotally mounted on said bracket for oscillating movement, said member being connected to said valvepiston rod to be actuated thereby, an auxiliary valve actuating lever pivotally mounted on said member eccentrically of its pivot, operating connections for said main piston rod and lever, and tappet blocks on said auxiliary valve stem coacting with said lever.

5. In a valve gear, the combination of a main cylinder, a main piston, a main cylindervalve, a valve piston cylinder, a valve piston for controlling said main cylinder valve, an auxiliary valve for controlling said valve piston, a supporting bracket, a member pivotally mounted on said bracket for oscillating movement, said member being connected to said valve piston to be actuated thereby, an auxiliary valve actuating lever mounted on said member eccentrically of its pivot, operating connections for said main piston rod and lever, and tappet blocks on said auxiliary valve stem coacting with said lever, said bracket being provided with cylinder, a main cylinder valve piston, an

auxiliary valve for controlling said valve piston, a supporting bracket, a member pivotally mounted on said bracket for oscillating movement, said member being connected to said valve piston to be actuated thereby, an auxiliary valve actuating lever mounted on said member eccentrically of its pivot, operating connections for said main piston rod and lever, and tappet blocks on said auxiliary valve stem coacting With said lever. V

7. In a valve gear, the combination of a main cylinder, a main piston, a valve piston cylinder and valve casin connected to said main cylinder and provided With an inlet and an exhaust, a valve piston, a main valve controlling the inlet and exhaust of said main cylinder actuated by said valve piston, an auxiliary valve casing connected to said valve piston cylinder and provided With an inlet and an exhaust, an auxiliary valve controlling the inlet and exhaust of said valve cylinder, a pivotally supported oscillating member connected to said auxiliary piston, an auxiliary valve actuating lever pivotally mounted on said oscillating member eccentrically of its pivot, and operating connections for said main piston and lever whereby the auxiliary valve is given an initial movement by the main piston and a further movement by the valve piston.

8. In a valve gear, the combination of a main cylinder, a main piston, a main cylinder valve, a valve piston cylinder, a valve piston for controlling said main cylinder valve, an auxiliary valve for controlling said valve piston, a pivotally mounted oscillating member, an auxiliary valve actuating lever pivotally mounted on said oscillating member eccentrically of its pivot, operating connections for said main piston and lever, and operating connections for said valve piston and oscillating member whereby the aux iliary valve isgiven an initial movement by said lever and a further movement by said oscillating member.

9. In a valve gear, the combination oi a main cylinder, a main piston, a main cylinder valve piston, an auxiliary valve for controlling said valve piston, a member actuated by said valve piston, an auxiliar valve actuating member mounted on said member actuated by said valve piston and having operating connections With said main piston whereby the auxiliary valve is given an initial movement by the main piston and a fur ther movement by the valve piston.

10. In a valve gear, the combination of a main cylinder, a main piston, a main cylinder valve piston, an auxiliary valve for controlling said valve piston, operating connections for said main piston and auxiliary valve, and operating connections for said valve piston and auxiliary valve, said auxiliary valve being given an initial actuation by the movement of said main piston and a further actuation by the movement of said valve piston.

11. In a valve gear, the combination of a main cylinder, a main piston, a main cylinder valve piston, an auxiliary valve for controlling said valve piston, and means for actuating said auxiliary valve including said main and valve pistons arranged so that the movement of the main piston imparts an initial movement to the auxiliary valve and the movement of the valve piston imparts further movement to said auxiliary valve.

lln Witness whereof, I have hereunto set my hand and seal in the presence of two Witnesses.

JOHN G. BIRD. [n s] Witnesses:

E. M. SMITH, N. E. ltnnvns.

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