Patents Completed.
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Complete specifications of the following patents will be sent to any address in the United Kingdom upon receipt of eightpence per copy at the Sale Branch, Patent Office, Holborn, W.C.
FURNACE FOR HARDENING STEEL TOOLS. — Braysha,w. — No. 4,861, dated 27th February, 1909.—This invention relates to salt bath furnaces for hardening cutters and like tools. The bath or melting pot is surrounded by a firebrick easing and is enclosed at the top by a firebrick cover. The pot has a flanged opening (5), that registers with a similar opening formed in the casing, and through this, the tools are introduced into the pot. It will be seen that the joint between the opening in the casing and that in the pot is such that the flames or combustion gases from the burner below cannot escape at this point or enter the pot. Holes are
provided in the cover through which rods (f) extend into the pot and carry a tray (F), and a hole is provided in the cover to accommodate a tube (K) for a pyrometer. The furnace is supported on removable firebricks which rest on a cast-iron stand in which is arranged the
burner (C). Immediately above the burner, a ring of firebrick (Cl) is provided, through which the flames from the burner are directed. By means of the removable firebricks, the amount of air admitted to the furnace can be regulated, arid, if desired, the burner may be completely enclosed, so that air is only admitted through the latter. VARIABLE-SPEED GEAR. Morton.—No. 15,955, dated 8th July, 1909. —This invention relates to variable speed gears of the type in which the gear-wheels are constantly in mesh. The driving shaft A carries a pinion (C) which gears with a spur whe,e1 (D) mounted on an intermediate shaft (E). The shaft E also has rigidly secured to it spur wheels (Ill En), which are constantly in mesh with the spur wheels (G. Gil loosely mounted on the driven shaft B. The reverse drive is effected by a pinion (11, which is fast on the shaft E. This pinion gears with an idle pinion (L), which, in turn, gears with a spur wheel (G2) loosely mounted on the driven shaft B. Feathered on
the shaft B, are two double dog clutch members which are slid along the shaft by the operating rods P Pl. These clutch members are adapted to engage clutch teeth formed on the spur-wheels C, G, Gl and Cl, so that either of these wheels can be made fast to the driven shaft NON-SKID DEVICE. — Richardson and Another.—No. 4,654, dated 25th February. 1909.—This device comprises two conical rollers, each mounted on an arm that is pivotally secured to the rear axle of the vehicle. Each roller consists of three discs mounted on a sleeve which is rotatable On the pivoted arm. These discs are spaced apart by conical blocks, the outer surfaces of which are covered with rubber. The edges of the discs project beyond the rubber surface, and grip the surface of the road when the device is in operation. The free end of the pivoted arm is connected to the axle by means of a chain and shackle, so that, when the
device is not required, it may be drawn tip clear of the road. Side chains are also provided to maintain the rollers in position.
STEERING GEAR.—D. Napier and Son, Ltd. and Another.—No. 993, dated 14th January, 1909.—The object of this invention is to provide for the adjustment of the worm and worm segment, and also to take up slack due .to wear. The housing E, carrying the worm seg. ment A, is bolted to the bearing plates G. Set bolts (H) are provided which screw into the plates G, and a number of thin washers (K) are interposed between the housing E and the bearing plates G. When it is desired to adjust the relative positions of the worm segment A and the worm B, the bolts H are withdrawn, and the necessary number of washers are removed or added,. according to requirements.