IMPROVEMENTS IN REVOLVING SHOW STANDS FOR EXHIBITING ARTICLES IN SHOP WINDOWS AND FOR OTHER LIKE PURPOSES
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Walter John Lloyd at the Office of
the Commissioners of Patents on the 15th February 1882.
WALTER JOHN LLOYD of the Firm of Lloyd Brothers of Harborne in the County
of Stafford Manufacturers. "IMPROVEMENTS IN REVOLVING SHOW STANDS FOR
EXHIBITING ARTICLES IN SHOP WINDOWS AND FOR OTHER LIKE PURPOSES."
My Invention consists of the construction and arrangement of parts hereinafter
described for regulating or controlling the speed of the said revolving show stands,
whereby a slow uniform motion is imparted to the stands and the frequent winding
up of the spring mechanism which is required in the ordinary arrangement is
rendered unnecessary.
The said revolving show stands consist essentially of a supporting plate on which
the articles to be exhibited are held in any convenient way. This supporting plate
has on its underside a socket which takes upon the axis of the rotating mechanism
arranged in the base of the stand. The rotating mechanism consists essentially of
a spring barrel the motion of which is transmitted through a fusee and train of
toothed wheels to the axis of the supporting plate of the stand.
In order to prevent the rapid running down of the spring barrel and to give a
uniform rotatory motion to the stand I use a governor or regulator constructed as
follows. The acting parts of the governor consist of pendulums or weighted arms
and resemble generally the pendulums or weighted arms of an ordinary steam engine
or other motive power engine. The axis carrying these pendulums or weighted
arms is geared to the train of toothed wheels by which the motion of the spring
barrel is transmitted to the axis of the revolving stand the said pendulums rising
more or less from their normal vertical positions as the speed of their axis more or
less increases as is well understood. The balls or weighted ends of the pendulums
are covered with sheet india-rubber or other yielding material for the purpose
hereinafter explained. Surrounding the lower parts of the pendulums or weighted
arms is a fixed cylindrical case or hollow cylinder.
When the speed of the stand exceeds its normal speed the coated balls or weighted
ends of the pendulums carried by the rotating axis come into contact with and are
pressed forcibly against the inside of the fixed cylindrical case and by the frictional
contact between the said balls and the said case the motion of the stand is retarded

page_text: until it resumes its normal speed when the pendulums fall and the balls no longer
press on the case. In this way a uniform rotatory motion is permitted in the stand
and the rapid running down of the spring mechanism prevented, the greater the
speed communicated to the axis of the pendulums the greater will be the friction
between the balls of the pendulums and the fixed case and hence the rapid return
of the revolving stand to its normal speed.
The normal rate of motion of the governor may be determined by the use of light
springs acting upon the upper or short arms of the pendulums. In proportion as
the springs employed are stronger a more rapid rotation is required to throw out
the balls sufficiently far to bring them into contact with the case or hollow
cylinder.