US1039151A - Governor. - Google Patents

Description

J. J. LISGH.

GOVERNOR.

APPLICATION TILED NOV. 15, 1909 1,039,151, I to w Patented Sept. 24, 1912.

Witnesses I X UNITED STATES PATENT OFFICE.

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Specification of Letters Patent.

Application mea-rwemm 15, Swat-Io. mam.

To all whom it may concern: a,

Be it known that I, J Acoii J. LIsoH, a citizen of the United States of America, and resident otBel-l'evue, Campbell county, State of Kentucky, have invented certain new and useful Improvements in Governors, of which the following is a specification.

This invention. relates to automatic controlling means for fluid compressors, and has for an object to produce a pressure responsive governor, which is'of simple construction, effective in operation and capable of a wide ran e of adjustment.

A further 0 ject is to produce a governor, which has no' in'termediate position, but which operates'to either deliver full motive power to the'fluid compressor, or to shut .off the motive power.

These and other objects I attain by means of 'anapparatus embodying the features herein described and iliustrated.

In the drawings accompanying this "application and forming a pa'rtthereof, Figure 1 is aside elevation of an apparatus embodying my invention, a portion of theapparatus being broken away for convenience of illustration. Fig. 2 is a partial section, taken on the line 22 of Fig. *1, and in the direction of the arrows. Fig. 3 is a de tail ofthe spring connect-ion.

The-apparatus shown, is adapted to control the operation of a motor driven fiuid compressor, by cutting the motor in or out of an operating circuit.

It consists of a cut-out switch 3 for the electric motorand a pressure actaated means, such as a diaphragm 4, which is re-; sponsive to the pressure pumped by the" compressorto be governed, and which is adapted, through the agency of levers, links and intermediate connections, to operate the switch. My invention may, however,.be employed for controlling-the operation of an engine or mechanically driven compressor, as will hereinafter be described.

The diaphragm 4 is inclos'ed within a chamber 5 and is exposed on one side to the pressure pumped bythe compressor, and on the other side to atmospheric or any other constant pressure. The chamber 5, below the diaphragm, communicates with a source of pressure pumped. by the compressor through a'pipe 6, and is adapted to occupy difi'erent positions in response to variations of pressure the chamber 5. The upper side of the diaphragm 4' is exposed to atmospheric pressure and supports a lunger 7, which projects upwardly through the walls 8 of thechamber and abuts against a lever 9, which is fulcrumed on a bracket,

mounted on or formed integrally with the wail The pl-unger 7- is reciprocated by the diaphragm 4: and operates the lever 9, so that ltswmgs about its fuicr'um point and occupies different positions in response 'toand aninsulating finger 14, which is -actn-'- Patented Sept. 24, 1912.

ated by the device 12 to'separate'the teiininals and thereby out off the flow of current to the electric motor. The springtenninals' -are mounted-on opposite sides of anhnsuiat ing and each is nected to a terminal post 16 fora} wir'eo'f the motor circuit. The finger 14 1S flmonntetl'onan'arm 17, Which'is fulerumed-on a bracket 18.

The operating device 12 for the arm 17 is so constructed that the arm is moved either to fully-"open or to fully ciose the switch 3.

The device consists of a belt crank lever 19, fulcrumed concentrically with the arm-17 on the bracket 18, and which-is actuated by the lever 9. A link 20 ispivotaltly connected to an arm 21 or the bellcrank and projects through aslot formed in the outer pr free end of the lever 9. Adjustably mounted nuts 22 are mounted on the link 20, on each side of the lever '9, and form with the link a lost motion separated so that they form,with the pin, a

lost motion connection between the bellcrank and the arm 17. One end of springs 25 is secured to the outer end of the arm 26 of the bellcrank, and the other end is so lo-.

cated and secured that the spring will move the bell-crankto one or the other extreme.

chamber 5, below. the diaphragm 4. This causes the diaphragm, the plunger 7, and the lever 9, to occupy different positions.

The motion of the lever 9 is transmitted through the lost motion connection, formed by the nuts 22, to the bell-crank 26. When thepressure in the chamber 5 is below the predeter'minedpressure, and the switch 3,

and consequently the bell-crank 19, are in the closed position, an increase in" pressure will raise the lever 9 until it contacts with one of the nuts 22, and, as the pressure continues to increase, the lever will continue to.

rise and will move the bell-crank 19 from its extreme open position past its intermediate position, lnopposition to the tension of the springs 25. This motion of the bellcrank will not be transmitted to the arm 17 because of the lost motion connection formed by the prongs 23. As soon as the bell-crank has been moved past its intermediate position, the tension of the spring operates to move the bell-crank to its extreme closed position. Thismotion of the bell-crank is transmitted to the arm 17, and the finger 14 is forced through the spring terminals 13 to open the switch and cut ofi thecurrent to theelectric motor. The upward motion of the lever 9, in response to the pressure below the diaphragm 4:, takes place in opposition to the tension of the spring 10. As the pressire in'the chamber 5 below the diaphragm decreases, the spring 10 operates to return the lever 9, and when it is decreased a suflicient amount the lever engages one of the nuts 22 and then moves the bell-crank, in opposition to the tension of the spring 25,

"from the extreme open position past the in driving the compressor, or it may be employed to shift belts, or to otherwise control the delivery of power to the compressor.

I find it preferable to employ a plate 27 on the diaphragm 4 and between it and the plunger. This renders the apparatus more sensitive and decreases the wear on the dia phragm.

What I claim is:

In an apparatus of the character described, a control switch comprising bladeshaped spring terminals normally contacting witheach other, an insulating member capable of moving between and separating said terminals, a pivot-ally mounted arm for actuating said member, a lost-motion connection between the arm and the member, a spring secured to the arm for moving it from an intermediate to an extreme position, a rod for moving said arm from either extreme position past the intermediate position in opposition to the spring, an adjustable lost-motion connection between the rod and the arm, and pressure actuated means for actuating the arm.

JACOB J. LISGH Witnesses: 1

WALTER F. MURRAY, FRANK J. Gnvnn'rs.

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