Patent GB-419594-A (GB)
Title: Improvements in miners' or the like safety lamps
IPC: F21L23/00
Filed: 1933-02-15
Abstract: 419,594. Miners' &c. safety lamps. HAILWOOD, E. A., Beacon House, Texas Street, Morley, near Leeds. Feb. 15, 1933, No. 4591. [Classes 75 (i) and 75 (iv).] In a miners' or like safety lamp means are provided whereby a current of air coming from any direction is collected and definitely directed into the lamp in such a way as to prevent any vacuum effect inside the lamp. The collected air is caused to traverse a circuitous path and means are provided for adjusting the quantity of air supplied to the burner. The invention is particularly applicable to a lamp having a bottom air feed, an inner glass or combustion tube, and a burner dome. In the form shown in Fig. 1, there is inserted between the bush B and the oil vessel V of an existing lamp an air band provided with gauze rings R, R<1> guarded by a plate D which is rotatably mounted on a flange R<2> of the air band and locked in position by a hinged member A<11> embracing one of the pillars P. The plate D carries an annular member A<10> provided with an air inlet A<13> and with a channel A<12> fitted with baffles and communicating with a projecting air box A. The latter is formed with openings Ax and is fitted with a cover plate A<8> which is apertured at the top and bent downwardly at A<9> to form a bottom opening. The box A is formed into compartments whereby the air is directed towards a perforated plate A<5> towards which a spring A<6> presses a rotatable valve A<2> having an opening A<4> which communicates with an aperture A<1> opposite the gauze rings R, R<1>. Means may be provided for regulating the sizes of the openings A<13> and A<x>, and the aperture A<1> may be covered with gauze. The increased height of the lamp necessitates an extended locking device L and burner, the latter preferably comprising an inner wick-tube W<2> slidable within an outer tube W. A burner dome W<1>, which may be pivotally mounted on the wick tube, is formed with a flange W<10> to receive an inner glass G<1> which may be held in position by means of a loose collar F<6> on the lower end of a chimney F<3> slidable within a conical supporting ring F' with air panels, or by means of a weighted ring F<7> on the chimney. The inner glass G' may be mounted on a revolvable platform which is interconnected with the burner or its dome so that the parts rotate together in correct relationship to a reflector F<2> or the like, as described in Specification 414,418. The air band may be arranged to supply air to the upper part, or to both the upper and lower parts of the lamp. In modifications described and illustrated in the Specification, air boxes projecting from air bands are provided with vertically slidable covers carrying depending. plates so as to control the entry of air into the box and from the box into the air band. In the form shown in Fig. 18, an inner sleeve 5 is screwed at S<1>, S<2> to engage the oil vessel V and the bush of the lamp, is formed with a distancedoff gripping flange R<4>, and carries gauze panels R<1>. This sleeve fits tightly within another sleeve S<3> provided with gauzes R and having an extended flange R<2> which is perforated at R<3> and has a chamfered outer lip. The flange R<2> forms a seating for a rotatable air box A in the form of a conical sleeve with upper and lower flanges A<27>, A<28>, the flange A<28> being perforated at A<29> to register with perforations A<33> in an additional adjusting ring A<32>, whilst a number of pockets are formed by vanes A<38> projecting from the ring A<32> or from the flange R<2>. The flange A<28> has a depending inner flange (not shown) provided with slots or angular cuts to give the air access to another recess A<37> whereby the air can pass round to the other side of the lamp. The gap between flange R2 and ring A<32> may be provided with an outer guard ring, and stops may be provided to limit the rotation of the adjusting ring A<32>. The inwardly sloping surface of the air box may be directed upwardly or downwardly. The Provisional Specification refers to the use of tubular arms which surround the lamp and may rest on the air band so as to convey air to the air box, and to the use of an air box divided into a series of tubes which project above the top of the air box and have cut away parts or baffles to collect the air.