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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).
Mr. Hancock's anti-squeaking device for road wheel brakes.

Identifier  ExFiles\Box 12\5\  05-page199
Date  30th May 1930
  
X7860

Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer}
c. Sg.{Arthur F. Sidgreaves - MD} Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}
c. By.{R.W. Bailey - Chief Engineer} MB. DB.{Donald Bastow - Suspensions}

E1/M30.5.30.

X. 7360
X. 5360
X. 7930
X. 5930
X. 7420

RE - ROAD WHEEL BRAKES.
ANTI-SQUEAKING DEVICE

I have shewn R.{Sir Henry Royce} the sketch of Mr.Hancock's
anti-squeaking device we saw in Paris, and mentioned that
it was reported by GWH.{George W. Hancock - Head Chateauroux} to give good results.

The idea as you will no doubt remember is as
shewn in the sketch and consists of a pressure pad
standing somewhat proud of the brake shoe surface
and made to lift by means of a pivoted lever an elastic
toe on the trailing shoe against the pressure of
a spring.

The principle of operation is that the toe of
the trailing shoe is always kept in effective contact with
the drum when the brake is on, and thereby damps out
vibrations set up in the free piece of drum between
the two brake shoes.

R.{Sir Henry Royce} is rather inclined to doubt whether the device
would continue to act as intended after a certain amount
of wear had occurred on the friction surfaces, but he
thinks it suggests that we should make an experiment
with the trailing shoe pivoted in the centre

SEE ORIGINAL FOR SKETCHES.

E.{Mr Elliott - Chief Engineer}
  
  


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