Two-way Clutch as Gear Selector
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A Rsumr of Patent Specifications That Have Recently Been Published. Copies may be Obtained from the Patent Ogee, Price 1 /each — A NOVEL arrangement of clutch, 1-1 which enables one of two ratios to be selected at will, is shown in patent • No. 555,624, by S. A. Adolphe Saurer, Arbon, Switzerland.' The clutch is provided with two concentrically arranged driven shafts, and each drives a separate gearbox train. The frictioi,. plates can be made to drive one or the other, with an intermediate free position. .
The drawing shows the two driven plates, either of which can be engaged by the central plate (13). -The main spring (12), when permitted by the control thrust-ring (9), slides the sleeve (10) to the right, which takes with it the lower end of a bell-crank ' (3), pivoted on a fixed pin (2). When
this occurs, a boss (4) on the bellcrank moves outwardly and pulls, via links (6) ,on a pivot pin (8) which can move through a short arc about a fixed centre (14). On this pin (8) is a pushrod (7).(7), which works on one end of a double bell-crank (5), and so moves the clutch plate via a.' push-pull
rod (1). , The push-rod is pivoted and can be swung. to one side or the other of the double bell-crank.This• swinging motion gives a reversal of movement to the clutch plate, deciding which of the two driven plates it shall engage. The push-rod is set for position. by an external control attached to' a sliding collar (11); the drawing shows the alternative position in broken line.
A "STAY-ON " HYDRAULIC BRAKE ACTUATOR UROM G. Amery, 241, Quinton Road,
Birmingham, 17, comes patent No. 555,202. It shows a means for operating an hydraulic mechanism by a master cylinder which will maintain the developed pressure until the operating member is moved in the opposite direction. Although the device, at present, is mainly intended for operating aircraft auxiliaries, the inventor 'states that the system is equally suitable for the brakes 'of vehicles, or for hydraulic. jacks. ,
The drawing shows the master cylinder which, in this case, is worked by
a speeial handle giving an increasing purchase as the piston descends. At the bottom of the cylinder is a small chamber (4) open to the pipe-line and housing a small one-way valve (2). When the piston is depressed, fluid flows from the working space through this valve and into the pipes. When the descent of the piston ceases, the valve is closed by the line pressure and remains closed, so that the brakesor other mechanism " stay put."
Release is achieved in the following manner: a port (3) is normally closed by a one-way 'valve held on its seating by a light' spring (1): The spring, however, is not powerful enough to resist the line' pressure, and during the. descent of the piston. it is assisted by a plunger (5), which is a dash-pot fit in a piston bore (Q). .When the piston is raised by the handle, however, the plunger (5) leaves the valve which is then lifted by the line pressure and permits the fluid to return,
AN EASILY CLEANED OIL FILTER
pATENT No. 555,609 deals with an oil filter having a self-contained cleaning arrangement, the patentee being C. Vokes, 95-105, Lower Richmond Road, London, S.W.15. Although shown as an oil filter, its use may be extended to any liquid, and it may be used, with modifications, as an air filter. The dirty oil arrives' via the inlet (2) and flows down and around the outside of. the filter unit. After passing through the latter, it reaches the central, perforated tube, to which the exit port (5) is connected. The filter unit consists of alternate rings of felt (3) and Solid washers (4), the "loiter being of conical form, as are the-top and bottom end plates.
The self-cleaning action operates as follows:—A hand-wheel (1) fitted with a cross-pin, is, by the act of rotating, given an up and down motion by vir tue of a cam track (6). ' This motion is transmitted to the felt rings and causes them' to be alternatel3r compressed and expanded. A squeezingout action iS thus set up, the impurities tending to move towards the leastcompressed region, that is, the " dirty or outside of the felts.
THE shoe-retracting springs in the brakes of a large Vehicle are very powerful, and it is often quite a problem to stretch the spring and, at the same time, to hook it into its retaining pin or hole. To simplify this operation is the object of a modification in brake design shown in patent No. 555,581, by Wagner Electric Corporation, St. Louis, Miss.,. U.S.A.
One end of the spring, as will be seen from the drawing, is hooked; in the normal manner, on. to a grooved pin (3) in the brake shoe. At the other end, however, it is hooked on to a small toggle lever (1). , During assemblY, the leve,r is put into the position shown in broken line, in which it can receive the spring eye without stretching. The lever is then turned in an anti-clockwise direction, stretching the spring meanwhile. Eventually, the lever rocks over its dead-centre position and finally comes to rest against a boss (2), where it is permanently held by the tension of the spring.