A Valve-testing Apparatus
Page 62
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pATENT N. 391,218, by C. H. Vidal
and Joseph Lucas, Ltd., relates to a device for testing the gas-tight fit of valves in their seatings by means of a vacuum. The bell-shaped body is fitted with a rubber ring (B) where it rests Oh the block of the cylinder to be tested, bolding itself in place by vacuum caused by the depression of the piston (H) and its release by means of the spring shown.
The lower end of the spring rests on the head of the valve, thus holding it down on its seating, but permitting a communication between the vacuum chamber and the head of the valve.
In operation the knob is pressed down, then the device is placed over the valve and the knob allowed to rise, thus inducing vacuum. A mark on the plunger can be used to indicate whether or not the valve is 'holding the vacuum. In some cases the knob can be replaced by a vacuum gauge.
Automatic Clutch Operation.
THE names of Matt Payne and Clay
ton newandre, Ltd., appear in patent No.391,530, which relates to a means whereby a clutch can be automatically operated by vacuum obtained from the inlet pipe of an engine .and controlled by the accelerator pedal.
The clutch pedal (4) is connected to the piston of a vacuum cylinder (2), which, through pipes (6) is in communication with the source of vacuum. The accelerator pedal (10) is connected to a valve (8) which can govern the communication between the two pipes (6). The valve (9) is spring loaded, and has a conical stem which, when pushed to the right by the valve (8), Cal, gradually make communication with the atmosphere.
In operation, when the throttle is in the fully closed position, the port (14) is uncovered, whilst the opening (11) is fully closed by another valve (9), so that the cylinder (2) is supplied with suetion from the source (5) and the clutch is held disengaged as shown.
When the accelerator (10) is moved in the direction to open the throttle, valve element S moves to the right and first cuts off the suction supply by bringing its port (14) into engagement with the flange (13). After the port (14) has been closed in this way, the continued movement of valve 8 opens valve 9 so as to admit atmospheric air to the cylinder (2), the extent of opening of valve 9 being graduated in accordance with the position of the accelerator (10). Accordingly a small movement of the accelerator in a direction to open the throttle causes the pressure in the vacuum cylinder to rise gradually at a rate which is regulated by the opening of the second valve element, in such a way that the clutch is engaged more or less quickly according to whether the initial movement of the accelerator is greater or smaller.
IN patent No. 389,909, P. G. Vanni, 11, Via Rugabella, Millie, describes a form of combustion chamber for engines of the compression-ignition type, in which rotary movement is set.. up in the incoming air by any of the known means, such as tangentially disposed parts, screened inlet valves, etc., thus causing it to be directed by a lip (31) into a pocket (30), where it mixes with the fuel that is injected, thus, it is claimed, providing an improvement in the working of the engine. lubricating t e leaves of laminated springs. The upper view shows how pockets may be formed to take a grease gun, so that lubricant can be forced to the space between the leaves.
In one case a ball is shown, indicating a means for preventing the escape of the lubricant. The ball may be provided with a spring, or a pad of felt may be used to prevent it from rising. The lower figure shows how oil may be introduced to the upper leaf and how it can gravitate from one leaf to another, and thus lubricate the whole spring. In this ease a means such as wick may be employed to regulate the flow of the oil.
A11111 1=1111111MIE
A Thrust Bearing Improvement Described.
A PATENT, No. 390,946, has been
granted, to Aktiebolaget Svenska Kullagerfabriken, a Swedish company, for a means for securing the screwed -gland which adjusts and holds the outer member of a thrust ball bearing. The ring (10) is threaded in the housing, and is prevented from turning by serrations, shown in the end view, interlocking with two projections (13) from the outer cover (12).
It would seem that the ring (10) lies loosely in its housing, not being clamped or backed up by another threaded ring. This method of bolding a ring from rotating has been used here ever since ball bearings have been made, and it has been found that unless some means such as clamping or otherwise preventing slight movement of the ring is adopted, the threads soon strip and release their held•