US926689A

US926689A - Rotary pressure-motor.

Info

Publication number: US926689A
Application number: US41990308A
Authority: US
Inventors: Peter T Coffield
Original assignee: COFFIELD MOTOR WASHER Co
Current assignee: COFFIELD MOTOR WASHER Co
Priority date: 1908-03-09
Filing date: 1908-03-09
Publication date: 1909-06-29
Anticipated expiration: 1926-06-29

Description

P. T. COPPIBLD.

ROTARY PRESSURE MOTOR.

APPLICATION FILED MAR, 190s.

926,689. Patented Jim@ 29,1909.

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'UNITED STATES PATENT OFFICE.

PETER T. COFFIELD,`OF DAYTON, OHIO, ASSIGNOR TO THE OOFFIELD MOTOR WA SI-IER OOM- PANY, OF DAYTON, OI'IIO, A CORPORATION OF OHIO.

ROTARY PRESSURE -MOTOR.

Speeicaton of Letters Patent.

Application filed March 9, 1908.

Patented .Tune 29, 1909.

Serial No. 419,903.

To all whom it may concern:

Be it known that I, PETER T. COFFIELD, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Rotary Pressure-Motors; and I do declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the acconn panying drawings, and to the letters and Iigures of reference marked thereon, which form a part of this specification.

This invention relates to certain specific improvements in rotary water motors with particular reference to the rotary water pressure motor heretofore patented to myself, February 4, 1908, No. 878,044.

The present improvements relate particularly to the construction of the drivers or swinging valves, and to the construction of the double piston and the manner of attach ing it with the rotating shaft or cylindrical body which supports said piston. The object of the improvements relating to the drivers or valves is to free said drivers or valves from any rigidity that might possibly interfere with said drivers or valves readily finding their seats and properly settling upon said seats. The obj ect of the improvements relating to the piston and the manner of connecting it with its supporting shaft, is to obviate the difficulty in constructing said parts in one integral piece, and to lessen the labor and expense due to machine work which are incidental to these parts when they are con# structed in one integral casting.

A further object of the present improvements is to provide a series of auxiliary exhaust ports in the rotating shaft or cylinder which travel in advance of the main exhaust port and which relieve the pressure of the valves as each valve is passing. The valves reach the smaller or auxiliary ports 'first in the rotation of the piston, and as the main exhaust port reaches said valves, the pressure is reduced to such an extent as to not interfere with a proper operation of the valves.

Preceding a detail description of my improvements, reference is made to the accompanying drawings, of which- Figure 1, is a longitudinal sectional view on the line l) l of Fig. 2. Fig. 2, is a cross sectional view of Fig. 1, on the line a a.

In the following description or specification of my improvements, similar reference characters indicate corresponding parts.

The cylindrical motor casing 1, is provided with oppositelydisposed pockets or chambers 3. One end of the motor :asing is provided with an integral head 2 into which the chambers or pockets 3 extend and thus provide end pockets il which communicate with the pockets 3 in the casing. The other end of the motor casing is inclosed by a detachable head 3 which has similar pockets 4 which communicate with the pockets 3 at that end of the motor.

Mounted in each of the pockets 3 and extending into the pockets l in the heads of the motor casing, is a driver or valve, which in the present case, is constructed of two parts 5 and 6. The VIirst-named of these parts is the seating portion of the valve which is provided with the requisite Ilexible material, such as leather 7, which is held 'firmly between the plates 5 and S which constitute the valve or driver proper. The connection between the two portions of each valve consists of a pin 9 which penetrates an apertured boss 1() on an extended portion of the hinged member 6 of said valve, and bosses 11 on the seating portion of the valve. It is essential that this connection. between the two parts of each valve shall be loose to a certain extent in order that the seating or engaging portion 5 of the valve shall be free from rigidity and thus enabled to have a certain amount of llexibility in order that it may properly seat. This requisite llexibility is provided by making the aperture in the boss 1() slightly larger than the pin f). The hinged portion (3 of each driver or valve has an aperturcd boss 12 at each end through which a pin 13 passes loosely, one end of said pin being supported in the head, and the other end being supported in the detachable head through which it projects and is fitted with a nut 15 which serves to hold said pin in position between the two heads of the motor casing with the ends of the valves extended into the pockets el as before indicated. Around the pin 13 of each driver or valve is a helical spring 14 which exerts inward pressure upon each valve by having one end thereof extended in engagement with the hinged portion of said valve. These valves operate in and out of the pockets substantially in the manner described in my prior patent, and the improvements herein specified do not vary the functions of the same. The cylinder or shaft 1n is also substantially the same as in my prior patent, but in the present case, is separate from the piston. A division wall 17 separates longitudinally two chambers, to-witnlS and 19, the former of which has an outlet to the motor through a port 20, and an inlet from the feed pipe 21 through a port 22 near one end of the shaft. The chamber 19 receives the exhaust from the motor through a series of auxiliary or advancing exhaust ports 23 and a main exhaust port 2e in the rear of the auxiliary or advancing exhaust ports 23.

he double piston consists of metallic member having two arms or extensions 25 which are united by a base portion 26 through which a suitable number of screws 27 penetrate and secure said piston at its base to the shaft 16 on one side of the inlet port AO. Suitable leathers 2S are held firmly in position on the outer sides of the piston by means of

plates

29 and 30 and screws penetrating' the leathers and the walls of the piston. The outer edges of these leathers are faced or turned over in a manner to provide a suitable packing between the walls of the motor casing and the piston. The plate 30 inclosing one side of the piston is provided at its inner end with in-turned portion or hook 31 which is projected into the inlet port 2O and engages the adjacent edge of the shaft, which edge forms one of the margins of the inlet port. The piston is thus secured to the shaft 16 by this connection and by means of the connection' between the base of the piston as before indicated. lt will be seen that the piston occupies the portion or space upon the motor shaft which lies between the inlet port 20 and the main exhaust port 24. ln the rotation of the piston due to the inlet of the motive fluid through the port 20, such fluid is constantlyT trapped between the rear side of the piston and the inwardly-lying valve, and the pressure thereof is exerted with maximum force to rotate the piston in the direction indicated by the arrow C in Fig. 2. lfilhen the auxiliary or advanced exhaust ports 23 reach each valve, the initial escape or exhaust of the motive fluid relieves the pressure of the valve as said ports are passing and thus the main exhaust port passes each valve with a reduced pressure due to the relief of the exhausting fluid through the' ports 23. The end of the motor shaft through which the motor receives and exhausts, is provided with packing 32. These two packing members are conveniently held apart during the shipment of the motor and at other times when the motor is not in actual service, by means of a helical spring provided with a packing member 35 which surrounds that portion of the motor shaft and is held in position by a cap nut 36.

l claim:

1. in a rotary pressure motor, the combination with a shaft having two non-comi municating chambers for thc inlet and exhaust of the motive fluid, said shaft having a port providing an inlet from the inlet chamber to the motor, and a piston attached to said shaft, said piston having a portion thereof extended in to the inlet port in the shaft and engaging the interior side of the shaft adjacent to the inlet port, substantially as specified.

2. ln a rotar Y pressure motor, the co1nbination with a shaft having two non-communicating chambers for the inlet4 and the exhaust of the motive fluid, said shaft h aving a main inlet port forming a communication between tgie inlet chamber in the shaft and the motor, a piston having two extended portions provided. with suitable packing, and an extended portion of said piston lying within the inlet port and engaging the shaft on the interior thereof.

3. ln a rotary pressure motor, a casing having pockets therein, drivers or swinging valves located in saidv pockets, each of said drivers or valves comprising two members flexibly connected in a' manner to enable one member of the valve to properly seat, a pin penetrating portions of the other member of each of said valves and the heads of the motor casing, said pins forming a hinge for each valve as a whole, a spring supported upon said pin. and exerting an inward pressure on said valve, a motor shaft having a main exhaust port and a series of auxiliary exhaust ports moving in advance of the main exhaust port to relieve the pressure of each valve in passing the exhaust port.

e'. ln a rotary pressure motor, a motor casin(Y having an inlet and exhaust chamber therein, a main inlet port from said chamber to the motor, a. main exhaust port from the motor to the exhaust chamber, a series of auxiliary exhaust ports forming advancing exhaust ports from the motor to the exhaust chamber, a detachable double piston mounted upon said shaft, and a series of drivers or swinging valves mounted in the pockets in the casing, the pressure upon said valves due to the exhaust of the motor being relieved when each Valve passes the auxiliary or advancing exhaust ports.

5. ln a rotary pressure motor, a motor shaft having two non-comnuinicating chambers therein providing for the inlet and the exhaust to and from the motor, a main inlet port from said chamber to the motor, a main exhaust port and a series ol' advancing auxiliary exhaust ports `from the motor to the ex haust Chamber, a double piston detaehably supported upon said shalt and having a portion projected into the main inlet port and forming a connection between the piston and the shaft, and a series of drivers or swinging valves mounted in the Casing oll the motor, each ol' said valves Consisting of two meinbers flexibly connected, and means exerting an inward pressure on each of said valves.

6. ln a rotary pressure motor, a motor sha'lt having inlet and exhaust chambers with inlet and exhaust ports, in combination with a double piston detaohably mounted on said shaft between said inlet and exhaust ports, said piston having a portion thereof extended into the inlet port in the shalt and engaging an edge o'l' said port, and thus 'forming a connection between one side of the piston and the sha'l't.

ln testimony whereof I al'ix my signature, in presence of two witnesses,

PETER T. COFFIELD.

itnesses C. M. THEOBALD, R. J. MCCARTY.