US1861989A

US1861989A - Gas indicating apparatus

Info

Publication number: US1861989A
Application number: US271745A
Authority: US
Inventors: Trebitsch Bruno
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-01-19
Filing date: 1928-04-21
Publication date: 1932-06-07
Anticipated expiration: 1949-06-07
Also published as: DE506796C

Description

June 7, 1932. B, TREBlTscH 1,861,989

GAS INDICATING APPARATUS OrginalFiled April 2l, 1928 Patented June 7, 1932 UNITED STATES PATENT GFFICE BRUNO TREBITSCH, OF VIENNA, AUSTRIA GAS INDICATING APPARATUS Application led April 21, 1928, Serial No. 271,745, and in Austria January 19, 1928.

Renewed April 21, 15132.

My invention relates to an apparatus, which indicates the presence of combustible, explosive or poisonous gases in the air of a room where the apparatus is located and which is operated under the influence of gases of greater as well as of smaller density than the surrounding air.

The object of the present invention is to perform the indication of gases admiXed to the air by a reliable apparatus avoiding the drawbacks connected with apparatus of known types and the operation of which is based on the difference in the velocity of diffusion of air and gas and which operates independently of the density of the gas.

The apparatus according to this invention differs from the known types in that the diffusion takes place subsequently from the outer air into a porous vessel enclosing another porous vessel and then from the intermediate space between these two vessels into the inner porous vessel. As the diffusion of gases always takes place from both sides of the porous wall, a pressure rise is prevented temporarily within the vessels, until the gases within the same are of the same density, i. e. of the same quality as the surrounding atmosphere. By the use of a second porous vessel, the pressure rise within the inner vesf' sel will be much greater than it would be where a single porous vessel is used. The pressure rise within the inner vessel serves to operate an electrically or mechanically actuated signalling device in a well known manner.

The apparatus is shown in the accompanying drawing, wherein Fig. 1 is an elevation of the apparatus partly in a longitudinal section, whereas Fig. 2 is a section of the casing with the apparatus in a side view.

According to Figs. 1 and 2, a vessel is tted with a diaphragm 1, preferably a diaphragm of a suitable size and shape e. g. a cylinder of porous material, such as clay or the like, which is mounted by means of surrounding

straps

2, 3 on a base plate 4 preferably made of wood, by means of two interposed pieces 5 of a soft elastic material, e. g. cork. The straps are tightened by means of screws and nuts 7, 8. The diaphragm in the shape of a cylindrical vessel'is closed on all sides and contains another porous vessel or diaphragm 25, having one circular base in common with the former, and at this circular base a tube 9, preferably made of glass, is inserted and secured, so that no leakage is permitted at the joint. Preferably, the part of the Wall adjacent to the tube is of a tight material and made impermeable by varnishing. The glass tube is partly filled with mercury 10, and two contact pieces or

wires

11, 12, preferably made of platinum, are cast in the wall of the tube and are connected by

wires

13, 14 with the terminals 15, 16 at the casing 17, the bottom of which remains open, or at the base plate el. Adjusting screws 18 and 19 are arranged at the latter to adjust its position in such a way that the level of a quantity of current conducting liquid, e. g. mercury, within the tube is at a small distance from the upper contact piece 11.

rlhe terminals 15, 18 are connected to a source of electromotive force, e. g. a battery 20 and to avoid sparking effect when the current is slowly opened or closed, the conducting liquid within the tube is covered with an insulating liquid, e. g. oil, petrol or the like, to prevent the conducting liquid at its surface from being oxydated. A bell 21, or an indicating lamp, is connected in series with the battery. Y

If the atmosphere of the room, where the apparatus is located is identical with that of the gas enclosed within the diaphragm, the pressure of the latter is identical with that of the atmosphere, and the conducting liquid remains at rest in the tube 9. If, however, even a small quantity of gas, which i-s not present within the diaphragm is admiXed `to the atmosphere of the room, the gas is diffusing into the diaphragm and the internal pressure is increased, whereby the conducting liquid is displaced within the tube and the circuit closed between the

contacts

11 and 12.

A signalling device, a bell or the like, may also be connected in a circuit so that the circuit closed by the mercury acts upon a relay, which causes the bell to ring continuously even after the gas has ceased to influence the diaphragm and the mercury has returned to its previous position and the current in the tube has been interrupted.

What I claim is 1. An apparatus for indicating the presence of combustible, explosive or poisonous gases, comprising a porous vessel having double porous Walls, and a pressure indicating means connected With lsaid vessel so as to indicate the pressure Within the inner porous Wall.

2. An apparatus for indicating the presence of combustible, explosive or poisonous gases, comprising a porous vessel having double porous Walls, and a U-shaped tube partly filled with mercury and constituting a pressure indicating means operatively connected with said vessel, one terminal of said tube being permanently covered by the mercury and the other terminal located With its end at a small distance above the level of the mercury.

3. An apparatus for indicating the presence of combustible, explosive or poisonous gases, comprising a porous vessel having double porous Walls, a U-shaped tube partly filled with mercury and constituting a pressure indicating means operatively connected with said vessel, a terminal located above the level of the mercury, and means for adjusting the apparatus so as to bring the mercury level as near as possible to said terminal Without touching the same.

4. An apparatus for indicating the presence of combustible, explosive or poisonous gases, comprising a porous vessel having double porous Walls, and a pressure indicating means adapted to indicate the pressure within the inn-er porous Wall, both porous walls having a common impermeable base plate thereby preventing direct communication from the inner porous Wall to the outer In testimony whereof I have hereunto set my hand.

ING. CHEM. BRUNO TREBITSCH.