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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Article from 'The Autocar' magazine detailing various types of recently developed car jacking systems.

Identifier  ExFiles\Box 139\2\  scan0061
Date  9th March 1934
  
The Autocar, March 9th, 1934. 303

MADE EASY
Which You Can Buy for Your Car, and Recently Developed

DUGDALE

rarity of tyre failure, but the need for them is so acute on those few occasions that they should be part of the equipment. Owing to the fashion for low-built bodywork it has become well-nigh impossible to position jacks under some modern cars, especially when a tyre is deflated. Permanent jacks also serve their purpose in several other ways, helping enormously when cleaning and greasing, and adjusting brakes.
The D.W.S. jack was first marketed in 1931, and it employs three mechanically operated jacks, each permanently attached to the car, one in the centre of the front axle, where it does not upset the balance, and one on each side of the back axle. All four wheels can therefore be lifted clear of the ground at once. The jacks, when folded, are very compact and need not decrease the ground clearance because special brackets have been developed, so that instead of clamping the jack underneath the front axle it can be fitted alongside it.

No Awkward Stooping

At the back of the car the jacks can be attached alongside the springs instead of beneath them. Each jack, which in the case of the small model weighs about 5lb., is clipped into a narrow flat box and is wound open by means of a special telescopic handle which is carried elsewhere on the car. This handle has a detachable cross piece, and at its lower end a worm drive gear box which fits on to an extension from the jack. These extensions are so placed that they are accessible, and so that operating the jack does not involve awkward stooping. The jack is let down by turning the handle in a clockwise direction, and it takes about forty-five seconds to raise the front of the car.
The efficiency of the D.W.S. jack may be gauged from the fact that it is fitted as standard on all or part of the range of A.C., Alvis, Armstrong Siddeley, Avon Standard, British Salmson, Humber, M.G., Rolls-Royce, Standard, and Triumph. Brackets suitable for fitting D.W.S. jacks to 90 per cent. of the cars on the English market are kept

to JACKS
from PUMP
to SUPPLY TANK
The Autojack hydraulic system is automatically operated by a pump driven off the starter motor.

PUMP
to DISTRIBUTOR BY-PASS VALVE
PLUNGER
CAM
to DISTRIBUTOR BY-PASS VALVE
SUPPLY TANK
to FRONT WHEEL JACKS

(Right) The Marchal system employs slides under the springs, into which a special jack is slipped.

(Left) Accessible controls for the Jackall hydraulic system enable the car to be raised without the driver getting out.

Special jack and brace carried separately for use with the Stevenson Outrigger.

DETACHABLE OPERATING LEVER
RESERVOIR
to REAR WHEEL JACKS
FRONT
REAR

FIBRE
PERMANENT MOUNTING UNDER EACH SPRING
BALL JOINT
The special Marchal jack.

A 17
  
  


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