US536455A - Safety-lam p - Google Patents

Description

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W. J. GALLAGHAN. SAFETY LAMP.

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U ITED STATES PATENT OFFICE.

WILLIAM J. OALLAGHAN, OF CONNELLSVILLE, PENNSYLVANIA.

SAFETY-LAM P.

SPECIFICATION forming part of Letters Patent No. 536,455, dated March 26,1895.

Application filed April 20, 1894'.

.To all whom it may concern:

Be it known that I, WILLIAM J. CALLAGHAN, of Oonnellsville, inlthe county of Fayette and State of Pennsylvania, have invented a new and Improved Safety-Lamp, of which the following is a full, clear, and exact description.

My invention relates to improvements in safety lamps and particularly to that variety of safety lamps used by miners.

The object of my invention is to produce a lamp of this character, which may besafely used in explosive gas, which has a perfectly safe and strong lock, which is itself strong enough to resist the action of burning gas within it, which needs no shield to protect the flame in the gas, which is perfectly ventilated, which gives a steady light in a current of air, which is very sensitive with a large flame in gas, which is automatic in its action in smothering the flame within it,which will extinguish the light and shut up the lamp as soon as the surrounding air becomes dangerously charged with an explosive gas, which is constructed in such a way that the flame cannot be projected outward from the lamp, which is easily examined, and is arranged in such a way that'its damaged parts may be easily detected.

To these ends my invention consists of certain features of construction and combinations of parts, which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of my improved lamp. Fig. 2 is a central vertical section of the same. Fig. 3 is a sectional plan on the line. 33 of Fig. 2. Fig. 4. is a sectional plan on the line 4-4 of Fig. 2. Fig. 5 is a detail side elevation of the inner tube of the lamp top.

The lamp proper 10 is of the usual kind, adapted to screw into the ring 11. This ring is not new but I claim the means of locking the two parts together. The lock has a lug 12 which is fastened to the ring 11 and overlaps the lamp 10, and in this lug is a screw 13, the inner end of which is adapted to enter a socket in the lamp body, as shown in Fig. 2, while in the lug above the screw is a hole 14, into which molten lead may be poured which forms a Serial No. 508,262. (No model.)

packing around the screw and hermetically sealsit. The lamp is provided with'the customary glass ring 15 and with the usual side guards l6 connecting with'the flange 17 at the base of the outer tube 18 of the lamp top, which tube is perforated near the bottom, as shown at 19, the object of these perforations appearing hereinafter. perforated near the top, as shown at20, and riveted to the upper end of the tube is a smoke cap 21 which is provided with smoke holes 22 and has a handle 23 attached.

Between the bottomof the tube 18 and the top of the glass ring 15 is a perforated plate 24, which is open at the center and which has upwardly-extending arms 25 adapted to project through the slots 26 in diametrically opposite sidcs of. the inner tube 29, and these 7 arms have, at their upper ends, a fusible link 27 on which rests the cross rod 28 of the inner tube 29, which tube is smaller than the outer tube so as to leave an air space between them,- but near the bottom it is enlarged, as shown at '75 30, so as to fill the outer tube. The inner tube 29 is provided near the top with a transverse perforated plate 3l,-above which are side apertures 32, and the top of the inner'tube and of the outer tube also, are closed by a perfo- 8o rated plate 33.

The lamp burns freely under ordinary circumstances, and the action of it in gas is as follows: The gas enters freely through the intake holes in thelamp top and, reaching the light, ignites, causing the burning gas to immediately melt the fusible link 27, thus taking away thesupport of the inner tube which immediatel y drops, bringing the part 30 opposite the holes 19 and closing them. This action shuts out the gas on the outside and shuts in and smothers the gas within the lamp.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A lamp comprising the body having the glass ring, the outer tube resting on top of the ring and provided with lateral perforations at its upper and lower ends, an inner vertically sliding tube between which and the outer tube an annular space is formed, thelower end of the inner tube having an annular imperforate enlargement 30 to close said lower perforations, a perforated partition in the upper por- The tube 18 is also 60 u tion of the inner tube, said tube having lateral openings 32 thereabove, a transverse'apertured plate covering the top of the inner tube and extending beyond the same over the annular space between the two tubes, and a fusible support to hold said inner tube raised, substantially as described.

2. The combination, with the lamp having a body and a glass ring thereon, of the perforated outer tube of the lamp top, an inner tube perforated near the top and provided with an outer ring to close the perforations in the outer tube, a perforated plate arranged beneath the outer tube, upwardly extending arms on the said plate, a fusible link carried by the arms, and means for supporting the inner tube on the said fusible link, substantially as described.

3. The combination, with the lamp having a body and a glass ring thereon, of the top comprising an outer tube perforated near its upper and lower ends, an inner tube having a ring or annular enlargement 30 to close the holes in the lower portion of the outer tube, a

plate arranged beneath the tubes, and upwardly projecting arms having a fusible support to holdthe inner tube with the closing ring above the lower holes in the outer tube, said inner tube having a cross bar at its lower end to rest on said fusible support substantially as described.

t. The combination, with the lamp having a body and a glass ring thereon, of the top comprising an outer tube perforated near the top and bottom, an inner tube arranged within the outer tube and provided with a transverse perforated plate and side openings near the top, a perforated top plate for the two tubes, a perforated plate arranged beneath the two tubes, upwardly extending arms on the perforated plate, a fusible link carried by the arms, and a cross rod secured to the inner tube and arranged to ride on the link, substantially as described.

WILLIAM J. CALLAGl-IAN. Witnesses:

BERNARD CALLAGHAN, JOHN STEVENSON.

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