Patent GB-222499-A (GB)
Title: Improvements in and relating to liquid fuel burners and thermostatic controlling means therefor
IPC: F24H9/20
Filed: 1924-09-26
Abstract: 222,499. Cleveland Metal Products Co., (Assignees of Chadwick, L. S., Resek, M., and Dahlstrom, J. A.). Sept. 26, 1923, [Convention date]. Wick-operating devices.-Thermostatic wicklowering means in oil burners, particularly for use with water-heating apparatus and adapted to operate when the temperature of the apparatus or of the medium heated becomes excessive, consist of one or more thermostats, spring mechanism for lowering the wick and a latch for holding the spring in set position. The wick-lowering means forms part of or is directly connected to and supported by the burner structure, and when set may be so arranged as to permit free manual adjustment of the wick in either direction. In the form of burner shown in Fig. 4, which includes wick-stop mechanisn of the kind described in Specifications 206,545 and 207,505, comprising a ratchet wheel 45, a pawl 46, and stop-plate 47, in co-operation with a frame 49 supporting a flame spreader 51, the spring wick-lowering mechanism is disposed between cone collars 60. 61 on the wick-adjusting spindle 40. Secured to the collar 60 a ratchet wheel 62 co-operates with a pawl or flange 68 of a resetting lever 66 having a finger-grip 67. A drum 74, Fig. 7, is riveted to the lever 66, the spindle 40 passing through slots 76 in both drum and lever. A mounting 82 secured to a cross-member 25 of the burner-stand has a depending support 83, a stop 84 and an abutment 85, and pivoted to the support 83 are a latch trigger 88 and bell-crank lever 89 connected together by a spring 95. Secured to the burner-stand is a horizontal platform 110,. Figs. 4 and 7, between depending lugs 112 on which a rocker arm 114 is pivotally mounted, the forward end of which engages a part 93 of the latch trigger. The rear end of the rocker arm has abutments 119, 120 engaging the lower ends of stems 137, 129 of thermostats situated' respectively in a compartment of the water circulating unit and within the burner. In setting. the spring mechanism the lever 66, Fig. 10, is swung to the left until a lug 70 engages the abutment 85 about which as a fulcrum the lever is rocked so as to disengage the pawl 68 from the ratchet wheel 62. The lever is then held bv a lug 71 interlocking with a nose 90 of the latch trigger. During the rotation of the lever a chain 98 is wound round the drum 74 to cause the bellcrank 89 to be drawn upwardly by means of a link 97 and thus to increase the tension of the spring 95. When either or both thermostats are actuated the rear end of the rocker arm 114 is depressed and the latch trigger released whereupon the pawl 68 is caused to engage a tooth of the ratchet 62 which rotates with the lever 66 through the action of the spring and so rotates the spindle, 40 to lower the wick. When the mechanism is in " set " condition with the pawl 68 away from the ratchet 62, the wick may be adjusted by a hand-wheel 42 in either direction. Modifications include the features of the rotation of the stop-plate 47 to lower the wick by the release of a latch lever, of the rotation of the wick spindle by a spring-urged rack, and of the lowering of the wick in two stages. In the form shown in Figs. 28 and 29, a self-contained mechanism is applied to the wick spindle by a coupling member 42<b>. When the mechanism is set. a lug 334 extending inwardly from a drum 317, which is secured to a pivot 316 of a plate 315, is engaged beneath an abutment 341 of a latch-plate 339 connected by a link 340 with a thermostat lever. When the lug is released the drum swings on its pivot to engage the lug with a ratchet 300 and rotates under the action of a spring 325, thus causing the wick spindle to lower the wick. In the form shown in Fig. 40, the thermostat casing 380 is located at the side of the outer wick tube, and with the parts as shown the wick is normally adjusted by means of a hand-wheel 42, sufficient power being applied to overcome friction between a pressure plate 397 and an annulus 396 secured to a disc 395 riveted to the wick spindle 40. Expansion of the thermostat removes a plunger 390 from a catch pin 411 and through the agency of a spring 404 the) pressure plate is rotated in counterclockwise direction carrying with it the spindle which thus lowers the wick.