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Patents Completed.

19th December 1907
Page 20
Page 20, 19th December 1907 — Patents Completed.
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Which of the following most accurately describes the problem?

LIFTING JACK.—Rich and Another. —No. 13,419, dated 10th June, 1907.—The jack is composed of two members (a, 1') the upper member (b) slides in the lower member (a). The member (a) is mounted on a base (c), which has an extension, or side piece Id), terminating in a hook (e). This side piece allows the jack to be tilted, enabling the cradle (h) to be placed under the axle (i) of the vehicle, after which the vehicle is moved forward so as to bring the jack to its upright position, as shown in Figure 2. The member (b) is provided, on one side, with a ratchet; this engages the pawl (f) which is controlled by a spring (g), the pawl being extended to the opposite side to form a grip or hand piece.

STEERING GEAR. — Nfolesworth. No. 3,277, dated 9th February, 1907.—According to this invention, a vehicle is

provided with two sets of steering wheels, one set in front of the vehicle, as usual, and the other set directly behind the driving wheels. A link (h) passes to the rear from the end of an arm (i) fixed on to the vertical axes of one of the front steering wheels. It is pivoted, at k, to one arm of a lever (j fulcrummed beneath the axle (a) of the driving wheels (b); the other arm of the lever is linked to an arm (1) on the vertical Pivot of one of the rear steer.

ing wheels (d, d) Normally, when the lever (j) is in its central position, the ends of its arms are vertically below the axle (a). When the axle is lifted, it is also moved further away from the end of the arm (i), but the axle, when so lifted, also gets tilted, as shown in Fig. 2. The longer arm of the lever (j) to which the end of the arm (1) is linked, is thereby moved forward so that, in place of being moved in an arc of a circle corresponding to that in which the axle moves:it moves in a flatter arc which is concentric with the end of the arm (1). It will be seen that the lifting of the axle does not cause any turning movement to be imparted to the lever (i), and, therefore, the relative positions of the front and rear steering wheels remain the same.

VARIABLE SPEED GEAR.—Dowson.-No. 677, dated 10th January, 1907. A series of gear wheels (A, B, C) are

loosely mounted upon a counter-shaft (DI. These gear wheels engage, and are constantly in mesh with corresponding gear wheels (Al, Bt, Cl) keyed on to the engine shaft (E). The gear wheels (A, B, C) are provided with annular, friction surfaces (A2, B2, C2) within which two or more sectors (F) are disposed. Each sector is provided with a projection or pm (F1) which passes through a corresponding opening in the hollow shaft ID). When the gear wheels are running loosely, the inner end of this projection (F1) stands out within the bore of the shaft (D). When it is desired to use a particular speed, for example, the use of the wheel (A), a plunger (G) with an enlarged head (G1) is moved, by means of the hand lever (G2), along the bore of the shaft (D) until it engages the projections (Fl) of the sectors (F) corresponding to the wheel (A), and, consequently, these

sectors are forced outwards. The result of this action is to bring the periphery of each sector against the friction surface (A2) with the result that the sectors cant slightly, and jamb between this frictional surface and the point of connection between the projection (Fl) and the sectors. It will be seen that, in this way, a variable speed can be obtained. GEARCASE. — Birmingham Small Arms Co., Ltd., and Another.—No. 2,627, dated 2nd February, 1907.—This gearcase

for the differential gear of a motor is made in two main parts, one of which is divided. The part (a) is carried by the tubular casing (al, a2) of the differential shafts (bl, N), and is divided, in the plane of the shafts, for the purpose of readily attaching, or detaching, the casing from the tubes (al, a2). The end of each tube is chambered to receive bearings for the shafts (bl, b2) and also carries a flange (b5 or 0). The casing (a) is fitted to engage the flanges (b5, b6) as well as the chambered extensions (a2, a4). This serves to centre the casing relatively to the tubes (al, 42), and thus to the shafts (61 b2). The end of the casing is cut away, as at kl, to 1-e ceive corresponding projections (j1) on the part (c). This part is provided with bearings to receive the driving shaft (d1) with its bevelled pinion (el), and it is bolted to the divided portion (a). The recesses (kl, j1) cause the two parts of the casing to align with each other, and thus to bring the shaft (al) into true position relatively to the shafts (bl, b2). Other portions of the parts of the casing may also be shaped to interlock for the same purpose.

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