A New Piston-type Hydraulic Damper
Page 59
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IN a new type of hydraulic recoil damper introduced by Armstrong's Patents Co., Ltd. Beverley, East Yorkshire, one of die two pivoted arms is enlarged and takes the form of a pressed-steel casing which encloses the other working parts and carries a reserve supply of the fluid used. .
As to the mechanism itself, there are two cylinders arranged one above the other. A shaft provided with a flange for attachment to the chassis frame carries a double crank, the two pins of which are at approximately 180 degrees to one another. To these are attached the plungers which operate in the two cylinders mentioned above.
These communicate with one another by means of a drilled -passage, and adjustment is provided by means of a setscrew with a tapered slot, so that the movement of the fluid working through this • passage can be restricted to a greater or lesser degree as required.
During the upward miivement of the axle, however, greater freedom is necessary, and this is obtained by means of a fore, to adjust the damping effect during the compression of the road spring quite independently of the control during the rebound.
Automatic replenishment of the liquid in the cylinders is obtained by placing a ball-type non-return valve in the lower-cylinder piston, which is always submerged in the surplus oil carried in the outer casing. This supply is stated to be sufficient for 50,000 Miles of use.
For the bearing between the main arm of the Armstrong shock absorber and the link which connects it to the axle, a rubber bush is employed. In general
the construction robust and appears to he well up to Reemeo its work. For
reurce4 vehicles weighing
over a ton, the retail price is 15. 5s. a pair, and a lighter model is swim available at /3 3s.
This drawing reveals the various parts of the new Armstrong. dranlic shock absorber. Separate adjus tments a r e provided for compression and
rebound.