US 2069154 A
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Description (OCR text may contain errors)
Patented Jan. 26, 1937 UNITED STATES PATENT OFFICE Application April 16,
This invention is a device for completing a circuit through an electrical signal of either the visual or audible type whereby to indicate low pressure in a pressure line of any suitable character.
The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawing wherein:
Figure l is an elevational view illustrating the application of the invention to a pressure line.
Figure 2 is an enlarged sectional view through the device taken substantially on the line 2--2 of Figure 1.
Figure 3 is an exploded view of a cylinder and spring contact member hereinafter more fully referred to.
Referring to the drawing by reference numerals it will be seen that 5 indicates generally a pressure line through which water, air or the like is forced under pressure.
In accordance with the present invention there is interposed in the line 5 a casing 6 preferably of cylindrical form and provided at one end with a nipple 1 adapted to thread into a section of the line 5, and at a relatively opposite end with a screw cap 8 provided with a nipple 9 adapted to be threaded into a second section of the line 5 as suggested in Figure 1.
In the preferred embodiment thereof cap 8 has formed integral therewith and projecting inwardly therefrom a nipple III that has a threaded extremity on to which is screw-threaded one end of a cylinder I I of bakelite, hard rubber or a any other suitable non-conductive material.
At the connected ends thereof nipple I0 and easing II are provided with registering ports I2 as shown in Figure 2 so as to permit at all times a flow of fluid through the line to the end that the air gauge (not shown) with which such line is usually provided will register pressure at all times even though the pressure be below a predetermined amount, that is to say even though the pressure has fallen to such an extent as will, in a manner hereinafter more fully set out, permit a closing of the circuit through the electrically operable signal device.
A contact disk I4 of conductive material has a sliding fit within the cylinder II and is normally urged into engagement with the inner end of the nipple I0 which is also of conductive material through the medium of a suitably provided and arranged coil spring I5.
Preferably spring I5 has its respective opposite ends anchored in any suitable manner to 1936, Serial No. 74,771
the contact disk I 4 and caps I3 so that these parts may be handled as a unit.
The nipple IIJ together with the casing and associated parts is arranged in an electrical circuit involving an electrically operable signal I6 5 as suggested in Figure 1 which may be in the form of a bell, a light, or both and which circuit is controlled by a main switch I'I, preferably.
As shown in Figure 1 the cap I3, contact disk I4 and spring I5 which are of conductive mate- 10 rial are electrically connected with one side of the battery 13 or other suitable source of electrical supply through the medium of a wire I8 that is connected at one end with a terminal bolt 20 provided on and insulated from the closed end 15 of the casing 6. Secured to the bolt 20 is a conductor member 2| of metal or other suitable material which at one end bears against the cap I3 as clearly shown in Figure 2.
One side of the signal I6 is grounded while 20 the other side is connected with the switch I I one side of which is also electrically connected through the medium of a wire 22 and terminal bolt 23 with the casing Ii.
From the above it will be seen that when 25 there is a predetermined pressure in the line 5 contact disk I4 will be normally held out of engagement with the nipple I0 and against the action of spring I5. However, upon a fall of pressure spring I5 will force contact member I4 into engagement with the threaded end of the nipple I I] thus completing the circuit through the attachment (switch I! being closed) and the electrically operable signal element I6 whereby the latter is actuated for giving a signal to the 35 end that one may be apprised of the fact that there has been a fall of pressure in the line 5.
As shown in Figure 1 casing 6 may be suitably provided as at 24 whereby the same may be suitably anchored in position or attached to a sup- 40 port as found desirable.
It is thought that a clear understanding of the construction, utility and advantages of a device of this character will be had without a more detailed description.
Having thus described the invention what is claimed as new is:
1. A signal circuit closure for disposition with a pressure line for closing a circuit upon a fall of pressure in said line, and comprising a casing adapted to be disposed within the line, said casing being of conductive material and adapted to be electrically connected to one side of the signal circuit, said casing having a nipple extending inwardly thereof, a cylinder of non-conduc- 2 tive material connected with the inner end of said nipple, a contact member having a sliding fit Within said cylinder, spring means engaged with said contact member and tending to normally urge the same into engagement with said nipple for completing the signal circuit, and means for placing said contact member in electrical connection with one side of the source of electrical energy.
2. In a device of the character described a casing provided at one end with an inlet nipple, and at its relatively opposite end with an outlet nipple, said casing having internally thereof a nipple extending inwardly from and in alignment with said inlet nipple, said casing and internal nipple being formed of conductive material, a cylinder of non-conductive material threadedly engaged with one end of the internal nipple, a contact member having a sliding fit within said casing and adapted to move into engagement with said internal nipple for completing an electrical circuit, a cap of conductive material engaged with the free end of said cylinder, a spring of conductive material connected at one end of said contact member and at a relatively opposite end with the first-named cap, a conductor member having an end engaged with the last-named cap, and a terminal bolt securing the relatively opposite end of the conductor member to one end of said casing, said terminal bolt being insulated from said casing.