US872496A

US872496A - Oscillating-piston engine.

Info

Publication number: US872496A
Application number: US36058907A
Authority: US
Inventors: Paul A Bredsvold
Original assignee: HERBERT A VROOMAN
Current assignee: HERBERT A VROOMAN
Priority date: 1907-03-04
Filing date: 1907-03-04
Publication date: 1907-12-03
Anticipated expiration: 1924-12-03

Description

PATENTED DEC. 3, 1907; P. A. BRBDSVOLD. OSQILLATI'NG PISTON ENGINE."

APPLIOATIQN FILED MARA, 1907.

4 snare-sum 2.

- l/WE/VTOR P; A. Bredsvold v Arm/M a's .HE mamas PETERS cox, w

PATENTED DEC. 3, 1907.

I. A. B'REDSVOLD. \OSGILLATING PISTON ENGINE. I APPLICATION FILED MAR- 4,1907- 4 SHEETS-SHEET 3- llVI/EIVTOR P. A.Bredsvo1d.

I v 0 2 ATTORNEYS m2 xuwms PETERS co., WASHINGTQN. o. c

PATENTED DEC. 3, 1907. P. A. BREDSVOLD. OSGILLATING PISTON ENGINE.

7 APPLICATION FILED MAB..4, 1907.

4 8HBETS-SHEET 4.

we/won P.,A-.Bred3vo1d. Br

WITNESSES. mm.

ATTORNEYS rue "clams PETERS ca WASHINGTON, n c

' view of the parts shown in UNITED STATESMPATENT OFFICE.

PAULA. BREDSVOLD, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO HERBERT A.

VROOMAN, OF ST. LOUIS, MISSOURI.

OSCILLATING-PISTON ENGINE.

T 0 all whom it may concern:

Be it known that 1, PAUL A. BREDSVOLD, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and useful Im rovements in Oscillating-Piston Engines, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompany ing drawings, forming part of this specification.

My invention relates to oscillating" piston engines, and more particularly to that class of engines in which a plurality of pistons are employed, said pistons being preferably arranged in a common piston chamber.

One object of my invention is to provide means of causing the pistons to move with equal angular velocity, thereby overcoming the unequal strains caused in this class of engines when the action of the engine depends upon the unequal angular velocity of the various pistons.

Another object of my invention is to provide improved valve mechanism for controlling the supply of motive fluid to and eX- haust thereof from the pistons.

Still another object of my invention is to provide improved means for changing the oscillating movement of the pistons into rotary movement.

In the accompanying drawings, which illustrate one form of engine made in accordance with my invention, together with a slight modification thereof, Figure 1 is a section of the line 11 of Fig. 2, Fig. 2 is a section of the line 22 of Fig. 1, Fig. 3 is a view similar to Fig. 1, but showing some of the parts removed and also showing the movable parts in a different position. Fi 4 is a top plan %Fig. 5. Fig. 5 is an end elevation and Fig. 6 is a view similar to Fig. 5, but showing a slight modification. Like marks of reference refer to similar parts in the several views of the drawings.

10 represents the main housing in which is formed the piston chamber 11. The main housing 10 is provided with two

end pieces

12 and 13 respectively. The end piece 13 is covered by a cap 14. The

ends

12 and 13 and the cap 1.4 are held in position by means of bolts 15 in the usual manner. The space inclosed by the cap 14 forms the steam chest 16 of the engine. Passing through the ends Specification of Letters Patent.

Application filed March 4, 1907- Serial No. 360589.

Patented Dec. 3, 1 907.

12 and 13 and the cap 14 is the crank shaft 17.' l

Surrounding the shaft 17 within the piston chamber 11 is a sleeve 18 in which sleeve are formed the bearings 19 for the oscillating pistons 20, the said pistons 20 being provided with shafts 21 seated in the said. bearings 19. These shafts 21 project through the end 12 and have secured to them the connections for rotating the shaft 17, as will be hereinafter more fully described. At the opposite end of the engine, the saidshafts 21 are journaled in the head 13. essary, however, for two of'the said shafts 21 to project through the head 13. Secured to these two shafts 21 are fingers 25 and cam lifters 26.

Surrounding the crank shaft 17 within the steam chest 16 is a disk valve 27, the said valve 27 being provided with openings 28 for the passage of the shafts 21 and the fingers 25. These openings 28 are so formed as to provide contacting surfaces 29 which are engaged by the fingers 25 to shift the disk valve 27. The parts are so proportioned, however, that the contact of the fingers 215 with the faces 29 only moves the valve 27 through portions of its travel. The remaining part of the travel is accomplished by means of spring arms 30 pivoted to astud 31 carried in the end 13. Each of these arms 30 is provided with a roller 34 adapted to engage with a retaining lug 32 carried by the disk 27 and thus retain the disk in fixed position during a ortion of the travel of the pistons. Each of the retaining lugs 32 is provided with a cam face 33, which is adapted to be engaged by one of the rollers 34 to complete the movement of the disk. Formed in the disk 27 are two pairs of

ports

35 and 36 respectively. The ports 35 are adapted to be moved alternately into and out of register with ports 37 in the ends 13, and the ports 36 are adapted to be moved alternately into and out-of register with It is only nec- V supply of motive fluid is reversed.

pistons through the

ports

36 and 38.

is as follows: When the parts are in the position shown in Fig. 1 of the drawings and steam, or other motive fluid, is admitted to the steam chest 16 through inlet port 43, the disk valve being in the position shown, the ports 35 in the disk valve 27 and the ports 37 in the end 13 are in register so that the motive fluid passes through said ports into the space between the two opposite pairs of pistons, thus driving the upper pair of pistons outwardly and downwardly in opposite directions, and driving the lower pair of pistons upwardly and outwardly in opposite directions. As the pistons near the end of their travel, the fingers 25 of the shafts 21 will come in contact with the faces 29 formed by the openings 28 and thus move the valve disk through a portion of its travel. Such movement of the disk, however, is not suflicient to complete the movement of the valve. It is sulflcient, however, to cause the upper roller 34 to engage with the incline 33 on the lug 32 and thus cause the completion of the movement of the disk. By this construction, I am enabled to allow the pistons to complete their stroke before the In order to overcome the difficulty of lifting the lower roller 34 by means of the incline 33, upon the lower lug I provide the cam lifters 26,

which, as will be seen, are so arranged as to lift the said roller 34 before the fingers 25 come in contact-with the faces 29. As soon as the movement of the disk has been completed, the parts will be in the position shown in Fig. 3, and the motive fluid will be admitted between the two opposite pair of The upper pair of pistons will now be moved upwardly and inwardly and the two lower pair of pistons downwardly and inwardly, the operations of the parts being the reverse of that above described.

In order to change the oscillating movement of the pistons 20 to rotary movement, I secure to the shafts 21 of said pistons, where they project through the end 12, arms 45. Each of these arms 45- has pivoted to it one end of a link 46, the opposite end of which is pivoted to a crosshead 47 running in a guide way 48. Each of the crossheads 47 has pivoted to it a link 49, which is pivoted at its opposite end to one of the wrist pins 50 of a double crank 51. It will be evident from this construction that the vibrating movement of the pistons will be communicated as rotary movement to the crank shaft 17.

In Fig. 6 I have shown a slight modification, which may be used in case the engine is used to drive machinery requiring only a reciprocating or vibrating movement. In this constructionthe cross-heads and connecting parts are omitted and the shafts 21 areprovided with gear wheels 55 which .mesh with each other and insure an equal angular velocity of the various pistons. The machinery to be driven may be then connected directly to one or more of the shafts 21.

It will be evident that in the operation of my engine the parts are always submitted to equal and opposite strains as the various pairs of pistons move in opposite directions with equal angular velocity, and consequently the engines will not be subject to strains such as are present in reciprocating engines or in oscillating piston engines where the pistons move with different angular velocity. Moreover the valve mechanism of my engine is such as to secure the most el'licient operation of the engine.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a steam engine or the like, the combination with four independently pivoted oscillating pistons arranged in a common piston chamber, of supply and discharge ports for alternately admitting fluid to and from said chamber between opposite pairs of pistons.

2. In a steam engine or the like, the combination with four independently pivoted oscillating pistons arranged in a common piston chamber, of means for alternately admitting motive fluid to and exhausting it from said piston chamber between opposite pairs of pistons, and means for causing said pistons to move with the same angular velocity. v

3. In a steam engine or the like, the combination With four independently pivoted oscillating pistons symmetrically arranged around a center, of means for alternately admitting motive fluid between opposite pairs of pistons, a common crank shaft for said pistons, and connections between said pistons and crank shaft.

4. In a steam engine or the like, the combination with a plurality of oscillating pistons, of a valve device controlling the admission of motive fluid to and the exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, and other means for completing the travel of said valve device.

5. In a steam engine or the like, the combination with a plurality of oscillating pistons, of a valve device controlling the admission of motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, other means for completing the travel of said valve device, and means for causing said pistons to move with the same angular velocity.

6. In a steam engine or the like, the combination with a plurality of oscillating pistons, of a valve device controlling the admission of motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through 7. In a steam engine or the like, the com bination with a plurality of oscillating pistons, of a valve device controlling the admission of motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, other means forcompleting the travel of said valve device, said latter means also serving to retain said valve device in a fixed position during a part of the movement of said pistons, and means forcausing said pistons to move with the same angular velocity.

8. In a steam engine or the like, the combination with a plurality of oscillating pistons, of a valve device controlling the admission of motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, and a yielding arm for completing the travel of said valve device.

9. In a steam engine or the like, the combination with a plurality of oscillating pistons, of a valve device controlling the admissionof motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, and a yielding arm for completing the travel of said valve device, said arm also serving to retain said valve device in a fixed position during a portion of the movement of said pistons. I

10. In. a steam engine or the like, the combination with a plurality of oscillating pistons, of a valve device controlling the admission of motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, a yielding arm for completing the travel of said valve device, and a lifter for said arm actuated by said pistons. 11. In a steam engine or the like, the combination with oscillating pistons, of a valve device controlling the admission of motive fluid to and exhaust thereof from said pistons, means actuated by said pistons for moving said valve device through a part of its travel, and a yielding arm for completing the travel of said valve device, said arm also serving to retain said valve device in fixed position during a portion of the movement of said pistons, and a lifter for said arm actuated by said pistons.

12. In a steam engine or the like, the combination with a plurality of independently pivoted oscillating pistons, of a valve disk controlling the admission of motive. fluid to and exhaust thereof from said istons, said disk being provided with cam aces, means actuated by said pistons for moving said disk through a part of its travel, and yieldingly mounted members cooperating with said cams to move said disk through the remainder of its travel.

13. In a steam engine or the like, the combination with a plurality of independently pivoted oscillating pistons, of a valve disk controlling the admission of motive fluid to I and exhaust thereof from said pistons, said disk being provided with detents and cam faces, means actuated by said pistons for moving said disk through apart of its travel, and yieldingly mounted members cooperating with said detents to retain said disk in fixed position and with said cams to com plete the travel of said disk.

14. In a steam engine or the like, the combination with a plurality of independently pivoted oscillating pistons, of a movable disk controlling the admission of motive fluid to and exhaust thereof from the said pistons, said disk being provided with. detents and cam faces, means actuated'by said pistons for moving said disk through a part of its travel, yieldingly mounted members cooperating with said detents to retain said disk in position and with said cams to complete the travel of said disk, and camlifters actuated from said pistons for lifting said yieldingly mounted members.

15. In a steam engine or the like, the com bination with a plurality of independently pivoted oscillating pistons, of a valve disk controlling the admission of motive fluid to and exhaust thereof from said pistons, said disk being provided with detents and cam faces, means actuated by said pistons for moving said disk through a part of its travel, spring mounted arms cooperating with said detents to retain said dis in said position and with said cams to complete the travel of said disk, and cam lifters actuated by said piston for moving said arms.

16. In a steam engine or the like, the combination with four independently pivoted oscillating pistons arranged in a common piston chamber, of means for alternately ad: mitting motive fluid to and exhausting it from said piston chamber between opposite pairs of pistons, an arm carried by each of said pistons, a pair of crossheads, links connecting two or said arms to each of said crossheads, a double crank, and connections be tween said crank and said crossheads.

In testimony whereof, I have hereunto set my hand and affixed my seal in the presence of the two subscribing witnesses.

PAUL A. BREDSVOLD.

Witnesses:

W; A. ALEXANDER, ELIZABETH BAILEY