US670999A - Pressure-gage. - Google Patents

Description

UNITED STATES PATENT NE'jcricUr, Ass

GNORS TO THE MONARCH lilvANUFAC'lURING COMPANY,

.Pnra'ssuFria-encre.y

SPECFICATION form-ing part of Letters Patent N o. 670,999, dated April 2, 1901.v Application liled January 8, 1900. Serial No. 794. (No model.)

. To all whom may concern.; Be it known that we, ARTHUR .L PURIN- 'roN and LEONARD W. SWEET, citizens of the 1 United States, residing at Waterbury, inthe county of New'Haven and lState of Connectiout, have in vented certain new and useful Improvements in4 Pressure-Gages, of which the following isaspecilication,

The invention relates to a gage that is so ro constructed that should the pressure in a pipe, chest, boiler, .or other receiver or chamber withjwhich it communicateschange to a predetermined degree an `electrical circuit will be closed in the gage. "This gage is particularly adapted fornse with an engine-stop of thenatureof that shown and described in i United States Letters Patent No. 599,014,

granted February 15, 1898, whereby wlfen the circuit is closed in the gage the stop is caused zo to operate the valve with which itis connected,

although it is adapted for use with a vacuumbreaker like that set forth in United States Letters Patent. for a system for stopping engines, No. 635,080, granted October 17, 1899,

2 5 for causing the vacuum to be broken when it changes to the predetermined point;

The object of the invention is to provide a simple instrument of. this nature with electrical terminals adj ustably arranged to be 3o so set that electrical contact will be made and the circuit closed -in tlie gage at the exact del sired pressure.

In the forms of the invention illustrated` there is one electrical conducting-terminal that is moved by the movement of the curved pressure-tube of the gage as the pressure 7changes, and there is another electrical con.

ducting terminal that is adjustably fixed with relation to thev movable terminal, which 4o terminals are so located that when the pressure varies from the desired amount the movable terminal is carried opposite the adjustably-fixed terminal, causing them to make contact and close the circuit, so the stop or vacuum-breaker in the circuit will be set in operation, as more particularly hereinafter described, and pointed out in the claims.

'Figure 1 of the accompanying drawings is a front viewpf .a gage 'that embodies the invention with the cover, hand, andV most of .the dial omitted. Fig. 2 is a View of the back of the same-gage. Fig. 3 is a side viewof this gage with the case and pressure tube cut in section.

In the circular case l is an ordinary curved 55 pressure-tube f2, the fixed end of which is adaptedto be connected by a nipple 3 with a pipe, chest, boiler, or other receiver or chamber in which there is liuid-pressureto becontrolled. The' free end of the tube is connected by a linke with a lever 5, mounted upon an arbor 6, that is lheld. by plates 7and 8, which are connected by posts 9 and secured to the back of the case in any desired manner. The lever has a segmental rack 10, the teeth of which mesh with the teeth of the pinion 11, thatis mounted upon the arbei- 12. This arbor outside ofthe indexed dial 13 `bears an indicating-hand 14, and inside of the dial 'one end of a spring l5 is attached to 7o the arbor for returning the hand toward zero in opposition to the movement effected by the straightening of the tube as the pressure changes.

In the form of the invention illustrated an arm 16 is'pivoted upon the lower end of the arbor 6. The free end of this arm has a stud 17, that extends through a slot 18 in the back plate of the case, which stud is provided with a pointer 19 and a uut 20. On the outside ot' 8o the back of the case, adjacent to the slot and in position to coperatc with the pointer, is a scale 21. The arm and pointer may be clamped by tightening the nut; but when 'the nut is loosened the pointer and arm may be moved and set as desired.

A block 22 of insulating material is attached to the arm inside of the case, and mounted upon this block is ayieldingconducting-Hugger 23. This insulated finger, .which forms the 9o adj ustably-fixed terminal of the circuit in the gage, is connected by insulated wire 21 with a binding-post 25, whichis insulated from the case. The binding-post 2G is in electrical connection with the case, andwhen the pin 28, projecting from the segment l0, which pin forms the movable terminal, engages the finger 23 an electrical connection is made through thefpa'rts from one binding-post to the other.

IOO

When the nut on theback which clamps the arm in position is loosened, the arm may be swung to bring the finger-terminal in such position that the pin'- terminal will engage This apparatus can of course be connectedwyith a bell or other apparatus besides an anp` tomatic valve-closing apparatus and vacuumbreaker, and the terminals may be so adjusted that contact will be made and the apparatus set in action either when an undue frise Ain pressure occurs or a sudden fall in pressure takes place.

This apparatus isfvery simple, and it is readily adjusted so as to operate accurately when the emergency arises.

We claim as our invention-'- 1. A pressuregage having avcase, a pressure-tube, an electrical terminal moved'by the variations of the tube,a binding-post in electrical connection withthe movable termi- Y nal, a pivoted arm bearing aninsulated terminal within the case, a-stud projecting from the arm through a slot in the back plate of the case, a clamp-nut on .the outside of the back plate for fixing the stud in position, and an insulated binding-'post in electrical connection with the* insulated terminal on the pivoted arm, substantially as specied.

2. A pressure-gage having a case, a' pressure-tube, an electrical terminal moved by the variations of the tube, a binding-post in electrical connection with the movable terminal, a pivoted arm bearing,r an insulated tery minal within the case, a stud projecting from the arm through a slot in' the back plate of the case, a pointer movable with the stud and a scale' on the back of the case adjacent to the slot in position to coperate with the pointer in indicating the position of the insulated terminal on the arm, substantially as specified.

3. A pressure-gage having a case, a pressure-tube, a link connected'with the free end of the pressnre=tube, a leverconnected with the link, a segmental rack connected 4with the lever, apinion mounted on .the pointerarbor and engaged by the rack, a circuit-terminal connected with the rack, a bindingpost in' electrical connection with the terminal on the rack, a pivoted arm 'bearngan insulated terminal within the case and having an end extending through the back plate ol" the case, and an insulated binding-post in electrical connection with the insulated terminal, substantially as specified.

ARTHUR J. PURINTON. LEONARD W. SWEET.

Witnesses:

ERNEST S. BENTON, ALICE S. HUDSON..

Images