US1932291A - Fire extinguisher - Google Patents

Description

9 @33 RPREFONTMNE FIRE EXTINGUISHER i@et 24 Filed Sep't. 19, 1932 INVENTOR ROLLAND PREFONTNNE Patented Oct 24, 1933 UNITED STATES PATENT lOFT-ICE Application September 19, 1932 f Serial No. 633.761

4 Claims. (Cl. 169-36) This invention relates to improvements in nre extinguishers of the hand grenade type.

They principal feature of this, invention resides in the provision of an improved form of glass vessel for containing the fire extinguishing liquid, said vessel being designed so that the manufacture, filling and sealing thereof may be accomplished at a relatively low cost compared with present practice.

Another feature resides in providing the glass -vessel with a weakened wall portion whereby the vessel is readily fractured by internal pressure to permit escape of the fire extinguishing liquid when the temperature of the atmosphere to which the vessel is exposed exceeds a. predetermined value.

A. further feature resides in providing the vessel with a special form of seal that may be readily fractured by the pressure of the thumb or nger to permit use of the vessel as a hand sprinkler or to ensure escape of the liquid when the vessel is thrown into the fire. i Other features and advantages of the invention will be more readily understood from the following detailed description taken in connection with the accompanying drawing, in which- Fig. 1 is a view in elevation of a nre extinguisher provided in accordance with this invention. i

Fig. 2 is a vertical sectional view through the fire extinguisher appearing in Fig. 1.

Fig. 3 is a fragmentary vertical sectional view illustrating the manner in which the lling tube forming part of the vessel seal may'be readily fractured by pressure of the thumb to permit use of the fire extinguisher as a sprinkler or to ensure escape of the liquid when the vessel is thrown into the re.

Fig. 4 is a fragmentary vertical sectional view showing the manner in which the weakened wall portion of the vessel is disrupted by internal pressure when the vessel is heated to a predetermined extent by the surrounding atmosphere.

Fig. 5 is a fragmentary vertical sectional view indicating the manner in which the sealing device including the flllingtube is assembled with the body portion of the vessel.

Referring more particularly to the drawing, 11 designates a glass vessel having a restricted neck .portion 12 made relatively thin and weak compared with the main body portion 13. The vessel 11 contains a ilre extinguishing liquid 14 intro- 'duced therein through the filling tube of a separately formed sealing device attached to the neck 55 portion 12. The filling tube of the sealing device is indicated at 15 and has its inner end Joined by a solid mass of glass 16 to the inner end of aA surrounding tubular member 17. The member 17 is also made of glass and has its outer end shaped to provide a flaring portion or flange 00 18 joined to the end of the neck portion 12. The inner'end of the glass member 17 is closed of! by the mass 16 which is pierced to provide an opening 19 placing the inner end of the filling tube 15 in communication with the interior of 65 the vessel 11. That portion of the sealing device comprising the member 17 and the solid glass mass. 16 lies wholly within the receptacle 11, but v the length of the filling tube is suchthat the outer portion of this tube projects a substantial distance beyond the outer end of the member 17 and the neck portion 12. The outer end of the filling tube 15 is sealed or closed oil as indicated at 15a after the fire extinguishing liquid has been introduced into the vessel 11 via the filling 75 tube and the opening 19.y

The fire extinguisher described herein may be' supported in an inverted position from that shown by any suitable form of supporting bracket usually provided for extinguishers of this type. If a fire should break out in the vicinity of the extinguisher so that the atmosphere adjacent the vessel 11 becomes highly heated, the internal pressure developed in the vessel will, when the wall structure of the vessel becomes heated to a 35 predetermined degree, cause the neck portion 12 to fracture, as indicated in Fig. 4. The resulting separation of the'sealing assembly from the body of the vessel permits free escape of the fire extinguishing liquid.

The device described herein may also be used as a hand sprinkler. In this case the vessel 11 is grasped in one hand and thumb pressure applied to one side of the lling tube 15 so that the tube is broken away from the annular member 17, the break usually occurring at the point where the filling tube is joined to the solid glass mass 16. The container is then held with the neck l2 pointing downwards and agitated to facilitate escape of the fire extinguishing liquid through the opening 19.

When the container isto be thrown into the fire inthe manner of an ordinary hand grenade it is also preferable that the filling tube be first broken off in the manner previously described so 10J as to ensure escape of the fire extinguishing liquid in case the vessel should fall on `some cushioning structure that would prevent it from shattering.

In making the fire extinguisher described herein, the seal assembly comprising the hollow member 17, the filling tube 15 and the pierced solid connecting mass 16 is produced as a separate unit by well known glass making methods and is then inserted in the neck portion 12 of the vessel 11 as shown in Fig. d so that when the insertion oi the sealing assembly is complete, the iiared portion or flange 18 at the outer end of the member 17 engages the end of the neck portion 12 to which it is then fused to form a substantially integral connection. The ire extinguishing liquid is then introduced into the vessel 11 through the tube 15 and the opening 19 in such a way that the liquid is under a slight pressure. After the filling operation is complete the outer end of the filling tube which is open during the filling operation is fused oil or sealed as indicated at 15a.

Having thus described my invention, what I claim is:-

1. A nre extinguisher of the class described including a vessel having a re-entrant neck portion, a filling tube arranged within said neck portion and a solid mass joining the inner end of said neck portion to the inner end of said filling tube, said mass being pierced to provide an opening placing the bore of the filling tube in communication with the interior of said vessel.

2. A iire extinguisher comprising a vessel having a restricted neck portion made relatively thin and Weak compared with the remaining wall portion of the vessel, a tubular member arranged within the vessel and having its outer end Joined to the end of said neck portion, a filling tube arranged within said tubular member, the inner ends of said filling tube and member being Joined together by a solid mass pierced to provide an opening placing the bore oi' the filling tube in communication with the interior oi the vessel.

3. A sealed vessel for containing a fire extinguishing substance comprising a body portion formed with an opening, a tubular member arranged within said body portion and having its outer end joined thereto at said opening, and a filling tube arranged within said tubular member, the inner ends of said filling tube and member being Joined together so that the bore of the filling tube is .in communication with the interior of the vessel.

d. A vessel for containing a re extinguishing substance comprising a body portion provided with an opening surrounded by a reentrant tubu-v lar member and a filling tube arranged within said member, the inner ends of said filling tube and member being joined together so that the bore of the filling tube is in communication with the interior of the vessel, the outer end o the filling tube being projected beyond the outer end of said member. y

ROLLAND PREFONT

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