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A Novel Form of Servo Motor

24th April 1936, Page 58
24th April 1936
Page 58
Page 58, 24th April 1936 — A Novel Form of Servo Motor
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I N patent No. 444,127 is described a new au-mechanical servo motor which may be used for any desired purpose, and for brake operation in particular. The inventor is G. P. Piganeau, 152, Boulevard Malesherhes, Paris. Dealing first With the interior construction, a journaled central tube (6) is slotted in a lengthwise direction and carries a number of flat paddles (3), which are slidable endways. Triangular-section weights (4) are held under 'spring pressure between the sloping sides of the paddles, and at rest occupy a position adjacent to the central tube, as shown. When the central tube is rotated, these weights move outwardly and in doing so cause a lengthwise extension of the mechanism ; this exerts a pressure on a push-rod (1) and operates the brake or other device, springs, (2) being-interposed to limit the maximum pressure.

Turning now to the method of driving, this is accomplished by a friction roller (5) which is pressed into contact with either an engine-driven disc or the interior surface of a brake drum. To allow for the necessary movement, the whole mechanism is hung from a swivelling bolt (7), about which it can be swung by means of a Bowden mechanism.

A New Hoffmann Ball Bearing.

'THE type of ball bearing which is packed with grease for life" is always an object of suspicion to a good engineer, and in patent No. 444,102 a. better design is described in which the bearing is thoroughly sealed, and yet it may be cleaned out and refilled without dismantling. The patentees are the Hoffmann Manufacturing Co., Ltd., of Chelmsfotd, and D. E. Batesole, of Glenbrook, Connecticut, U.S.A.

Referring to the accompanying drawing, the sealing mechanism comprises a dished washer (3) which fits into a recess (5) on the outer race, and is held in position by a snap-ring (1) for the reception of which a groove (4) is provided. The sleeve portion (2) of the washer forms an effective trap for grease endeavouring to escape. For flushing out and refilling with lubricant, two plugs (6) are provided in the outer race.

A Centrifugal Clutch cum Free Wheel.

A COMPACT' construction embody-Z-1 ing an autoniatic centrifugal clutch in conjunction with a -free wheel forms the subject of patent No. 444,009 by G. H: Roesch, 5, Garlinge Road, London, N.W.2, and-Clement Talbot, Ltd., Barlby Road, _London, W.10. The design is arranged so that the free wheel occupies a position in the centre

of the centrifugal clutch, a scheme which results in a considerable economy of space. In the drawing the enginedriven portions comprise a sleeve (5) and a carrier plate for the shoe pivots (1), whilst the output member consists of an enclosing drum (4) which is fixed to the central boss (2) of the free wheel which, in turn, is splined to the central gearbox shaft.

Both the free wheel and the centrifugal clutch operate in a known manner, although the latter is fitted with an equalizer ring (3) which is linked to the shoes, and ensures that the load is evenly distributed between, them. Several modifications are mentionee'i in the patent, covering alternative cOit:'' structions, including also the incorpOration of an hydraulic transmission.'

An An All-rubber Suspension System.

r-INE of the chief problems in the Vdesign of independent springing is' the disposal of the linkage system; which often extends. to• a considerable, height. • To solve this is one of the objects of the design shown in patent No. 442,591 by A. Neiman, 19, Erft-' strasse, Cologne, Germany. This inventor proposes to use rubber alone as the resilient medium, a tension, system being used for the main sus. pension, whilst compression affords a

damping effect. -• In the drawing, the axles are pivoted about the points (3), and are finally suspended on multiple rubber loops (2) arranged so as to come into tension successively. Damping is effected by rubber blocks (4) under -compression, and the whole system is adjustable by a stud (1), Progress in Torsion Springing.

AN interesting development of torsion-bar suspension is shown in patent No. 443,622 by H. Kapper, of Seestrasse 8, Berlin-Siidende, Germany. In this scheme, the torsion rods are formed of such a section that they may twist readily, yet be capable of withstanding the bending stress, and so require no additional supporting.

The accompanying drawing shows the scheme applied to a four-wheeled vehicle; in this case the torsion bars (1) are made with a cruciform section, and are fixed to the central chassis at only one point. This special section, if it be made suffiniently thin in the webs, will lend itself easily to twisting and, at the same time, carry the bending load, with little distortion.

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People: Roesch, A. Neiman

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