US 3488649 A
Description (OCR text may contain errors)
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GAS DETECTOR Filed Dec. 27, 1967 United States Patent 3,488,649 GAS DETECTOR Samuel W. Lee, 828 Nostrand Ave., Uniondale, N.Y., 11553 Filed Dec. 27, 1967, Ser. No. 693,912
Int. Cl. G081) 21/00 US. Cl. 340-237 2 Claims ABSTRACT OF THE DISCLOSURE It is the principal object of this invention to provide a gas detector of the character herein described that will automatically activate any desired type of alarm when there is gas in the atmosphere.
Another object of this invention is to provide a gas detector of the character herein described that can be used anywhere there is electricity to operate the mechanism of the detector.
Another object of this invention is to provide a gas detector of the character herein described that has a minimum number of parts enclosed in a container that can be placed where one may want to detect gas in the at? mosphere.
Still another object of this invention is to provide a gas detector of the character herein described that can be provided with any desired type of alarm, such as a bell, buzzer, light and/or a combination of any two or more alarms that can be located in any desired place.
Other objects of this invention of a gas detector will no doubt come to mind as the reading of this specifica tion and its appended claims proceeds and the appended drawings are examined.
In the drawings:
FIG. 1 is a pictorial view of this invention of a gas detector with its case broken open in part in order to show its internal mechanism.
FIG. 2 is a top sectional view of this invention of a gas detector, taken substantially along line 2-2 of FIG- URE 3, and viewed in the direction indicated by the arrows.
FIG. 3 is an end sectional view of this invention of a gas detector, taken substantially along line 3-3 of FIGURE 1, and viewed in the direction indicated by the arrows. 7
FIG. 4 is an end sectional view of this invention of a gas detector, similar to that of FIGURE 3, but showing an alternate form of its mechanism, having the upper portion of its case removed for reasons of clarity.
FIG 5. is a longitudinally disposed view of a modified form of the tubular balance arm that has been partly broken open to better show its internal construction.
In the several views of the accompanying drawings, like parts are indicated by like reference numbers.
The reference number 10 indicates this invention in its entirety, while the reference number 11 indicates a rectangular case having a fiat bottomi=12 on which is mounted the electric motor 13 that is connected to the pump 14. The aforesaid electric motor is electrically connected to the timer 15 which is mounted on one end wall 16 "ice of the aforesaid case 11. The just-mentioned timer 15 is connected by electric wires 17 to the side wall mounted power terminal 18. Electric wires connect the just-mentioned power terminal 18 to the electric alarm 19 and the toggle switch 20 that is reset by the reset arm 20. The aforesaid toggle switch 20 is activated by the lower and outer end 21 of the balance arm 22, which I personally call a fulcrum arm. The balance arm 22 has its inner end secured to the coupling 23 which is a hollow member that also provides support for one end of the tubular balance arm 24 which has its other and outer end terminating in the flexible container support 25. The flexible container being indicated by the reference number 26 in the accmpanying drawings. The aforesaid coupling 23 that provides a swingable balance point for the two balance arms 22 and 24 which are diametrically opposite one another, as one can readily see by examination of FIGURES 1, 2, and 3 of the accompanying drawings, is supported by the vertically disposed supporting structure 27 which is mounted on the previously-mentioned flat bottom 12 of the case 11. A pipe 28 connects the aforesaid coupling 23 with the aforesaid pump 14 which is also connected by an atmosphere intake pipe 29 with the outside of the aforesaid case 11, thereby providing the necessary passage of the atmosphere from the outside of this invention, through the pump 14, on into the flexible container 26, as is obvious from examination of the first two figures of the accompanying drawings. Although it is not shown in any of the views of the accompanying drawings, both pipes 28 and 29 must be provided with automatically operated check valves in order that the atmosphere will not be drawn in the opposite direction as the piston 30 of the pump 14 reciprocates.
The only two parts of this invention shown in the form illustrated in FIGURE 1 of the accompanying drawings that have not been mentioned are the longitudinally adjustable balance weight 31 that is located on the aforesaid balance arm 22 and the atmosphere disposal pipe 32 that projects out from the bottom of the aforesaid flexible container support 25 which will be provided with the necessary check valve. The check valve is connected to the aforesaid electric timer by an electric wire since the check valve is electrically controlled by the timer. The just-mentioned electric wire is not shown in any of the views of the drawings for reasons of clarity.
Before going into some of the optional forms of construction of certain details of construction of this novel invention, the preferred form of this invention, illustrated in the first three figures of the accompanying drawings, works as follows:
This invention 10 has its power terminal 18 connected to any desired source of electricity, the electric motor 13 is then started by means of the timer 15. The running of the aforesaid electric motor 13 will activate the pump 14, which can be of any suitable and desired type, although the reciprocating pump type is shown in the accompanying drawings. The activated pump 14 will draw in atmosphere from the outside of the case 11 through the intake pipe 29 and pump the atmosphere through the pipe 28, through the hollow member 23, on into the tubular balance arm 24, through the flexible container support 25, and on into the flexible container 26. If the atmosphere is lighter than air, the inflated container 26 will raise the outer end of the tubular balance arm 24, thereby dcpressing the outer end of the aforesaid balance arm 22 which will now press downward on the toggle switch 20 and will thereby set off the electric alarm 19 which will now warn people of the presence of a lighter than air gas in the atmosphere,
Since the weight of gases vary, this invention is provided with an adjustment in order that the gas detector can be used in any kind of atmosphere, regardless of the Weight of the gas contained therein. This adjustment is in the form of a balance weight 31 which is screwed longitudinally along the aforesaid balance arm 22 which is a threaded rod, as one can readily see on examination of FIGURES 1, 2, and 3 of the accompanying drawings. At the end of a predetermined cycle of operation of this gas detector 10, the atmosphere in the flexible container 26 is released automatically from the container through the aforesaid atmosphere disposal pipe 32.
Two optional forms of construction of the balance arms are shown in FIGURES 4 and 5 of the accompanying drawings. FIGURE 4 illustrates the replacement of the threaded balance arm 22 with the rod 33, also the addition of a spiral balance spring 34 on the aforesaid hollow member 23. The invention is also provided with a vertically adjustable stop 35 that is located under the longitudinal center of the tubular balance arm 24. FIGURE 5 illustrates the tubular balance arm 36. This type of balance arm, which is filled with either a liquid or grits in the V-shaped depressed portion 37, can be used with either the general construction shown in the first three figures of the accompanying drawings or with the optional form of construction shown in FIGURE 4 to make the device more sensitive.
What I now claim as new and desire to secure 'by Letters Patent is:
1. A gas detector of the character described, comprising a case, an electrically activated pump connected to draw air from outside the case, a flexible container, a
balance arm which is a hollow tube that has one end terminating in a hollow member that is movably supported by a vertically disposed supporting structure which is secured to the bottom of said case, the said hollow member being connected to the said pump by a pipe, the flexible container connected to the other end of said balance arm, a second balance arm that is diametrically opposite to the first mentioned balance arm and having one end secured to said hollow member, an electric switch connected to an electric alarm, the switch positioned to be activated by the other end of the second mentioned balance arm, and means of disposing of the atmosphere in said flexible container at a predetermined interval of operation of the said gas detector.
2. The invention of claim 1, wherein the second mentioned balance arm is a threaded rod on which is adjustably screwed a balance weight that has the configuration of a disk.
References Cited UNITED STATES PATENTS 1,308,626 7/ 1919 Crowell 7330 XR 2,673,339 3/1954 Gray et a1. 340--237 FOREIGN PATENTS 15,464 1884 Great Britain. 7,846 1891 Great Britain.
JOHN W. CALDWELL, Primary Examiner D. MYER, Assistant Examiner US. Cl. X.R. 73-30