Patents Completed.
Page 28
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PETROL. ELECTRIC SYSTEM. — Hart and Another.—No. 27,096, dated 28th December, l905.—In carrying out the invention as applied to a road vehicle, a series-wound electric generator (g) is driven direct by a petrol engine. The current generated is passed to a motor (m) adapted to drive the vehicle through a suitable coupling and other gear. The field windings (f) of the generator are arranged in sections connected to contact studs (d) on a suitable switch or controller. The field windings (h) of the motor (m) are also arranged in sections and connected to contact studs (e), preferably of the same switch or controller. Suitable contacts (It, c) are arranged to te simultaneously moved by the switch or controller handle (a) so that more or less of the field windings of the generator may be switched in or out of circuit so as to vary the voltage, and so that the windings of the motor may be similarly treated, or the full voltage of the generator may be sent through the whole of the motor field when high power is required. In this way the speed of the vehicle may be readily regulated, whilst the petrol engine and generator may be constantly run at normal speed, the engine having a mechanical
governor of any suitable type, or being governed electrically in any usual manner by current controlled, for instance, by the switch gear, and controlling the field windings of the generator or otherwise. It is preferred to arrange that the whole field of the motor cannot be switched out of circuit ; some of the windings being always left in as indicated at i.
BOILER SAFETY DEVICE.—Yarrow. —No. 2,364, dated 30th January, 1907.— It is well known that fusible plugs are usually employed in boilers as a safety device, but these are not convenient, in that steam cannot be kept up in the boiler whilst inserting a new plug To get over this difficulty, a pipe (BI is carried into the boiler (D) and sealed at C with a fusible plug. The plug is placed at the level below which it is desired the water shall not fall without the attendant being notified, and when the fuse goes, steam escapes from the end (A), and, thus, indicates that the dangerous limit has been reached. The outer end of the conduit may be provided with a cock for the purpose of shutting off the steam after the fuse has gone.
WORM GEARING. — Collier. — No. 8,054, dated 3rd April, 1906.—The member (d) has in its periphery a series of pockets wherein are mounted balls (e). The balls are retained in place by a casing (a), but the casing does not extend entirely round the member (d). Within the gap left in the casing, a worm (f) is mounted, and its form is such, that the pitch is uniform along a line corresponding to the pitch circle of the worm wheel.
IMPROVED METHOD OF MOLIKTIN G ENGTNES.—Lefebvre.--No. 27,826, dated (under Convention) 8th December, 1905. — The engine, clutch and speed gearing are consolidated as a single rigid structure (B) mounted upon the frame (A) of the vehicle by a-three-point suspension. It has been proposed to effect this suspension by means of one support placed at the forward end of the engine, and a pair of brackets situated between the engine and gearbox on opposite sides of the structure, which rest upon and are bolted to the sides of the car framing. As a result of this arrangement, the threepoint suspension is really confined to the engine itself, whilst the gearbox is attached to the structure as an excrescence from the engine. Consequently, all the relative movements of engine and frame are magnified in proportion to the degree of extension of the gearbox, which further increases the work of the universal joints upon the propeller shaft. According to this invention, whilst the front end of the
engine (B) is supported, as before, by a. claw or bracket (131) which rests upon the front cross-member (a) of the frame (A), the two points for the suspension of the rear of the rigid structure or driving unit. are afforded by a cross member (132) of which the two extremities are attached to the sides of the framing at 1/2. The crosspiece is situated altogether behind the gearbox to which it is secured, as close aspossible to the universal joint upon the propeller shaft. By this construction, tire. work upon the universal joint, for a given frame-distortion, is reduced, owing to the. increased distance between the points of suspension. Moreover, the reaction of thepropeller shaft, which in the previous arrangement referred to was transmitted through the gearbox to the supporting brackets, is, by the present arrangement, resisted by the cross-member which transmits it directly to the frame, so relieving the gearbox from this strain. The method of mounting which is the subject of thepresent invention facilitates the work of erection and fitting in place, and at thesame time simplifies the frame itself.
DRAW BAR.—Pickfords, Ltd., and Another.—No. 11,626, dated 18th May, I906.—The arms of this drawbar are adjustable laterally, so that it may hereadily applied to trailers whose engaging pins or lugs may be placed at different distances apart. The draw bar comprises.
a frame or head (c) having a rearwarc ly-. extending part (c2), and pivoted to each side: of the frame at (el), is an arm (e). The a.ans are provided at their free ends with eye (e2), adapted to take over the pin (IA) of tun trailer (b), and, connecting the arms to thepins (c2), are toggle links (el). The links are pivoted to a collar (e4) which is provided with an internal thread corresponding to the thread of the pin, and, by moy-ing it endwise in one direction or the other, upon the pin, the distance between the free ends of the arms (e) may be adjusted. Connection is made between the frame (c) and the tractor, by a jawed member (a) and pin (all which latter is carried by the jawed member and passes through the eye of a spring-controlled bolt (d).