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Single-plunger Injection Pump

18th November 1938
Page 86
Page 86, 18th November 1938 — Single-plunger Injection Pump
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Which of the following most accurately describes the problem?

A N injection pump, having but a

single plunger and fitted with a rotary distributor for supplying several cylinders, is the plan outlined in patent No. 493,422, by S. A. Adolphe Saurer, of Arbon, Switzerland. The distribution is achieved by rotating the plunger so that different discharge ports are, in turn, uncovered. No claims are made for the principle, the patent being based on a particularly compact construction.

In the drawing the usual pump parts are shown, comprising cam, rollers and plunger, whilst regulation of output is controlled by a screw-down by-pass valve (1). The camshaft carries also a bevel pinion (5), which meshes with a bell-shaped bevel gear (4). The latter rotates on a stub bearing upstanding from the ball-race housing. The pump plunger is rotated by this bevel gear, being squared at 3 to permit alsci of the reciprocating motion.

The upper part of the body is provided with four radial ports (2), of which two are shown; the radial bore in the plunger connects in turn with these and so distributes fuel to the four cylinders of the engine.

THE uses of plastics are gradually growing, and in patent No. 493,472 is shown a steering ball joint in which the wearing surfaces are formed in Bakelite. The patentees are the Automotive Products Co., Ltd., and G. Gates, both of Brock House, Langham Street, London, W.I. The joint carries the usual external characteristics, a stud (7) and an adjustable screwed sleeve (2). The stud is freely rotatable in a part-spherical collar (6) formed in a plastic material and housed in a spherical seating in the body. Rocking movement is taken by the ball seating, whilst rotary ,movement is allowed for by introducing a metal thrust washer The lower pad (4), which is also a moulded plastic, is fitted with a flange for the reception of a spring (5), and

,k34 has a small spherical seating on the top to complete the ball joint. The assembly is closed by a disc (3), and the whole joint is thus rendered proof against the ingress of water and dirt. It is stated that no lubrication is considered necessary, Self-adjusting Brake Mechanism.

MANY attempts have been made to design some form of device for maintaining a constant clearance between brake-shoes and drum, and one of the simplest is shown in patent No. 493,091, by H. van Der Hof, 285 Stadionweg, Amsterdam, Holland.

Designed for use with hydraulically expanded shoes, the device consists of a one-way slider with a predetermined two-way clearance. The unit consists of a cylinder containing a " piston " (1) made of a split wheel washer, of oversize diameter, stressed into a conical shape. This washer can move freely to the left, but locks rigidly against right-hand movement. A pair of these units is fixed between shoes and backplate, and thus shoe movement is limited to the clearance (2).

A Brockhouse Trailer-brake Refinement. IMPROVEMENTS in the manual operation of over-run brakes form the subject of patent No. 493,161, from J. Brockhouse and Co., Ltd., and A. Dear, both of Hill Top, West Bromwich. The drawing shows the usual arrangement of over-run brake, in which a spring-loaded plunger (3) is connected with the drawbar, and, upon over-running, pushes the brakeapplying lever (1) into the "on ' position. The subject of the patent is the provision of a pawl lever (4), which, by engagement with the rack (2), will hold the brakes on when manually applied, rather like the usual hand-brake lever. The difference in this case, however, is that the first movement of the drawbar plunger (3) forces the pawl out of engagement, to restore the automatic over-run action.

The Latest in Independent Suspension.

CONSTDERABLE research •is still ....proceeding in the design of independent-springing systems, and the latest suggestions in this respect are shown in patent No. 492,771, by T. Pratt, G. Manley, and A. Girling,

all of Guildhall Buildings, Navigation Street, Birmingham.

In this design, which applies to the front axle, the frame ends are joined by a cross-member extending beyond the frame to form eyes (4). The frame also carries a pair of bow-shaped plates (2), upon which are pivoted levers (1). These form the upper links of a parallel-motion linkage, supporting the king-pin heads in spherical cups. The steering brackets (6)• are guided in one plane by radius arms (3) and in the other by arms (5) pivoted some way back on the frame. Helical springs form the, resilient medium, being held between the levers (1) and tension rods attached to the eyes (4).

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