Rolls-Royce Archives
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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).
Page describing the Lovejoy damper, including a cutaway diagram.

Identifier  ExFiles\Box 28\1\  Scan089
Date  22th June 1926 guessed
  
-12-

Exactly similar types of damper are the Derihon and the Berkshire and both suffer from the same disadvantages.

(d) Dampers having fixed minimum loading obtained by spring controlled valves.

(i) The Lovejoy dampers.

The best known hydraulic damper with a spring loaded valve is the "Lovejoy" manufactured in America. This is a two stage, fixed loading single acting shock damper. They also market a single stage model. The essential details are a piston actuated by a crank and link.

[Text from diagram]
GLAND FREE FROM PRESSURE
LIGHT LOAD
HEAVY LOAD
STRAP CONNECTION
RETURN SPRING
SUCTION VALVE ADMITTING OIL TO CHAMBER WHEN SPRING IS COMPRESSED

The connection to the axle is by a flexible strap. When the axle rises the internal spring pushes the piston upwards,
  
  


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