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A Resume of Recently Published Patent Specifications

5th September 1947
Page 52
Page 52, 5th September 1947 — A Resume of Recently Published Patent Specifications
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Which of the following most accurately describes the problem?

Brake-assisted Steering System

ABRAKING system which automatically amplifies the steering action is shown in patent No. 588,665, by W. Boldt, St. Louis, Missouri, U.S.A. Steering movements are not affected until 75 per cent. of full lock is reached, when the brakes are applied to one side of the vehicle.

The drawing shows the layout in a diagrammatic form. Air (or fluid) is the braking medium, being compressed by a small pump (I) and stored in a reservoir (2). The brake pedal (3) controls the supply, which is connected to the brakes (4 and 5) in the usual way, the air first passing through a control valve (6). The steering gear, connected to the control valve by a Bowden cable (7), governs the air flow according to the plan outlined above.

Normal braking is unaffected and the steering-controlled system can be thrown in or out of action by a hand lever (8).


PATENT No. 588,035, from F. Neale, " Tresco," Stoneleigh Road, Gibbet Hill, Coventry, deals with a design for a

self-adjusting brake mechanism. The object is to provide a constant clearance during the whole life of the friction facings.

The shoes are operated by an expander (1) which may be worked mechanically or hydraulically. The. force is transmitted via a rocking lever (2), which conveys it to the shoes through a unit (3). This is a cylindrical sliding ratchet, consisting of a central member with internal saw-toothed grooves in which pawls (4) are held by a coil-spring (5) around their exterior.

A similar unit (6) acts as a return abutment for the shoes; this is fitted with a lost-motion collar (7), which governs the permissible clearance. The assembly works in the normal manner, the lower unit lengthening itself as the facings wear, and being unable to return A42 more than the set clearance. The upper unit lengthens in a similar manner as the facing wear is adjusted by the lower unit.


ADEVICE for automatically taking up the slack in a chain drive is shown in patent No. 588,784, which comes from E. Page and Ford Motor Co., Ltd., 88, Regent Street, 'London. W.I.

In the drawing, a jockey sprocket (I) is carried en a boss (2), which is eccentrically bored and free to turn on a shaft (3). Rotation of the boss will vary tension on the chain, the rotation being produced by a clock-type spring (4). A ratchet-and-pawl mechanism (51 is mounted between the ends of the boss and spindle, so that the tension remains at its initial setting. A spring plunger (6) frees one of the outer ratchets for resetting.


A GOVERNOR which can be inserted Pia& a unit between the carburetter and the inlet manifold forms the subject of patent No. 588,306, which comes

from H. Houlding, 5, Woodlands Terrace, Brackenbury Road, FulWood, Preston.

The governor controls the engine speed by limiting the flow of mixture. The restrictor consists of a conical coiled spring which, when compressed, reduces the space between the coils. The drawing shows this spring (I), which is housed in an extension of the intake pipe.

Mixture entering from the top exerts a force on a collar (2), which presses the spring towards the closed position and imparts a self-limiting characteristic to the flow of gas. An upper screw (3) is used to adjust the load on the main spring through a smaller interior spring, whilst the other screw (4) provides 3 positive stop in the closing direction.


THE subject of patent No. 587,202 is implement-lifting gear for tractors, specially directed towards selective lifting for uneven ground conditions. The patentee is International Harvester Co., of Great Britain, Ltd., 259 City Road, London, E.C.l.

When a tractor carries an implement at each end, it is necessary at the end of a row to lift the front tool a little • before the rear one. Another possible condition is that encountered when tilting a hillside; in this case the implement on one side should be lower than that on the other. The scheme shown will satisfy both of these requirements.

The drawing shows a plan view of the tractor and lifting gear. The implement is divided into four units, one at each corner of the machine. Each unit is linked by rodwork (1) to one of two cross-shafts (2) operated by servo cylinders (3).

As shown, one servo cylinder works the rear tools and one the front (this is for row-end conditions), but it is possible to rearrange the control levels (4) so that one -cylinder lifts the near-side tools and the other the off-side, the action most needed for slooina around.


People: H. Houlding

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