US1394887A - Pump governor mechanism - Google Patents

Description

w. F. COOPER. PUMP GOVERNOR MECHANISM.

APPLICATION FILED MAY 24, I9I7- I 1 394 7 Patented Oct. 25, 1921.

2 SHEETSSHEET I.

III;

W. F. COOPER.

PUMP GOVERNOR MECHANISM.

APPLICATION FILED MAY 24 1917. 1,394,887. Patented Oct. 25, 1921.

2 SHEETS-SHEET 2.

5 jive/Z5021 UNITED STATES WILLIAM F. COOPER,

PATENT OFFICE.

OF NOBWALK, OHIO.

PUMP GOVERNOR MECHANISM.

' Application filed May 24,

T 0 all whom it may concern:

Be it known that I, l/VILLIAM F. COOPER, a citizen of the United States, residin at Norwalk, in the county of Huron and tate of Ohio, have invented a new and useful Pump Governor Mechanism, of which the following is a specification.

My improvement relates to governor mechanism to automatically control the operation of an exhaust or pressure pump, this governor device controlling'the length or frequency of stroke of the pump according to the amount of air or other medium used.

A further object of the invention is to provide a sound insulating device for supporting the driving means, in this case an electric motor, thus insuring quiet operation.

This result is obtained by the use of the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a vertical section of an exhaust pressure pump showing a form of its application to control the length of stroke; Fig. 2 is a plan view of mechanism shown in Fig. 1; Fig. 3 is a side elevation of a modification of the mechanism as applied to change the frequency of operation of stroke; Fig. 4 is a plan view of the modification shown in Fig. 3; Fig. 5 is a sectional view of the speed changing pulley shown in Fig. 4.

- Similar letters refer to similar parts throughout the several views.

In the figures the invention is shown applied to an exhaust pump designed to operate any type of pneumatically actuated musical instrument such as a player piano or similar device.

To attain the results described I employ in Fig. l a large pulley 1) driven from any suitable source of power such as an electricmotor, by a belt 1 or other means. The shaft (2) has a crank (3) which operates a link (4) which in turn reciprocates the lever (5) together with the roller (6) and the link (7), thus giving a reciprocating motion to the exhaust pump This exhaust pump is provided with the customary valves 8'8". The valve 8" is connected by the channel (9) to thereservoir (10). This reservoir is provided with an arm 10 and a connecting link (11) attached to the link (7). The roller (6) is held in cont-act with the upper side of the lever (5) by the pump spring (13). p

In operation the exhaust pump draws air Specification of Letters Patent.

Patented Oct. 25, 1921.

1917. Serial No. 170,579.

out of the reservoir (10), moving the roller (6) by the aid of link (11) to the position shown in dotted lines at 6, thus shortening the stroke of the exhaust pump and decreasing the amount exhausted. When air is admitted to the port 10 the reservoir will be opened by the spring (12), thus increasing the length of stroke and automatically exhausting a varying quantity of air as it is admitted by the varying action of the player or other mechanism.

Figs. 3 and 4 show a possible modification of the application of this automatic control. The same bellows type of exhaust pump is shown at (14) connected to the drive wheel (15) and reciprocated by the crank (17).

At (18) in Fig. 4 is shown an electric motor with the customary drive shaft 18, and having attached thereto the speed changing pulley shown in section in Fig. 5. This pulley is made with two beveled and alternately intermeshed sections (19 and 20). The section ('19) is solidly attached to the shaft (18),the other section (20) is mounted on the shaft (18) to permit longitudinal movement on the shaft (18). The belt (21) which drives the pulley (15) passes between the two pulley sections (19-20).

The reservoir (22) is operatively connected through the medium of the lever (23) and the link (24) to the slidable section 20).

The operation of the pump (14) exhausts the air from the reservoir (22) through the channel (25), collapsing the same against the tension of spring (22) and through the medium of link (24) and lever (23) separates pulley sections (19-20), thus allowing the belt (21) to run on a smaller diameter and correspondingly slows up the pump (14).

The motor (18) is attached to the support (26) by the straps (27) and is held in tension against the belt (21) by the spring (28) in its varying positions as determined by the reservoir (22).

I have found by experiment that the very objectionable humming noise common to all electric motors can be eliminated by suspending the motor as shown with a comparatively long strap of soft cloth or fibrous material. of like characteristics. This soft material prevents the vibration being transmitted to the frame, etc., supporting the motor, and therefore eliminates practically all sound. I have found it desirable to economize in has been very much striven for in electric.

driven player pianos, but which has not been before this secured.

Upon admitting air to the reservoir (22) through the channel (24) the reservoir opens by the tension spring (22), increasing the effective diameter of the pulleys (19-20) and correspondingly increasing the speed of operation of the pump, thus affording an-efiective automatic control of the varyin quantity of air required. I

r A further modification of this invention to automatically control the varying quantity of air required is shown in the attachment of a rheostat (28) or similar speed controlling device in the electric current of the motor, this speed controlling device being operatively connected with the reservoir (22) by a link.(29) or similar means, so that upon the opening ofthe reservoir. the speed is increased and decreased when the reservoir is exhausted, thereby automatically supplying a varying quantity of air at a practically constant pressure.

This device, it is obvious, eliminates the necessity 'for a blow-off or safety valve of any kind, causes both the motor and the pump to operate with much greater efficiency, saves wear on the mechanism and secures a more quiet device on account of oration the elimination of a great portion of the strain on the pumps and the electric motor.

This device is more particularly intended for use in the present type of electrically pumped player piano, but it is obvious that it can also be applied to any power operatedtype of pumping mechanism, either.

compression or exhaust, in which it is desirable that a varying quantity of air, etc,

is used at a constant pressure.

-For the sake of simplicity and to better illustrate the mechanism, the reservoir is shown as connected to and operated by a single exhaust pumping member. However,

it is obvious that any desirable number of' exhaust members can be used and operated from the same pump shaft.

of the mechanism and what is claimed as new, it is desirable to explain that an exhaust pressure reservoir'of the bellows or similar type is considered as exhausted when the air is expelled and the To obtain a con- For the better understanding of the op-' reservoir..

springs are under tension, and filled when the air is admitted and the springs expanded. What I claim V 1. In a player piano, the combination of a suction pump for producing a suction in said player piano, an electric motor for driving said suctlon pump, said suction pump comprlsing a feeder bellows and a drivlng wheel therefor, said driving wheel being connected to said electric motor, a systemof links connecting said driving wheel with said feeder bellows, and a regulating bellows having connection with-said system of links to govern the stroke of said feeder bellows.

2. In a player piano, the combination of a suction pump for producing a suction in said player piano, said suction pump comprising a feeder bellows',.an electric motor for driving saidsuction pump, an oscillating link, driving means connecting with said electric motor and operative to oscillate said link, connecting means for connecting said feeder bellows to said oscillating link, and a regulating bellows operative by variations insuction to shift the point of connection of said connecting means with said oscillating lever.

3. In a device of the kind described, the combination of a pump having a movable part, a collapsible reservoir in valved communication therewith and adapted to be exhausted thereby, an oscillatinglever, one end of. which'is mounted on a fixed pivot, a connecting rod pivotally connected at one end with a movable part of said pump, .a link connecting the free end of the connecting rod to the movable part of said reservoir,

said connecting rod having an adjustable engagement with said swinging lever, the point of engagement determined by .the movable part of the reservoir.- 1

l. In a device of the kind described, the combination of a pump having a movable part, a collapsible reservoir in valved communication therewith, said reservoir having a movable part, an oscillating power lever, one end of which is mounted on a fixed pivot, a connecting rod pivotally connected at one end to the movable part of thepump, a swinging lever pivotally connected at one end to the moving part of the reservoir,,the free ends of theconnecting rod and of said lever pivotally connected 7 together, and means whereby the pivoted ends'ot said connecting rod and said lever are operatively connected to said first lever, said connection I being adjustable along said lever inresponse to the movement of the'movable part of the 5. In a governor for fluid pumps, the combination of a rotatable pump power shaft, a

crankpin on' theshaft,a link on the pin, a lever mounted at one end on a fixed pivot,

and pivotally connected at its free end with the free end of the link, a valved pumping device, a collapsible and expansible receiver adapted to be exhausted by the pumping device, a swinging lever pivotally connected at one end to a movable part of said receiver, a connecting rod pivotally connected at one end to a movable part of the pumping device, the free end of said connecting 10 rod pivotally connected to the free end of stroke of the pumping device and Vice versa. 15

WILLIAM F. COOPER.

In presence of- CHARLES SUHR, GERTRUDE COOPER.

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