Improvements in or relating to Draught-equalizing Devices for Vehicles.
Year: 1896

page_text: Date of Application, 15th Sent., 1896-Accepted, 14th Nov., 1896
COMPLETE SPECIFICATION.
Improvements in or relating to Draught-equalizing Devices for
Vehicles.
A communication from the Firm F. CRULL & Co., of Wismar, in Mecklenburg, in
the Empire of Germany, Manufacturers..
I, ALFRED JULIUS BOULT of 111 Hatton Garden in the County of Middlesex,
Chartered Patent Agent do hereby declare the nature of this iuvention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The object of the present invention forms an elastic equalizing device in which
the following arrangement is made: At the ends of a cross bar secured to the
longitudinal beam of the vehicle are pivotted two double-armed levers, at the front
ends of which are attached movable single-trees, the other ends of these levers
being connected by one or more springs.
The aim of such arrangement is to produce when the animals pull on the single-
trees, as great a turning of the levers connected to said single-trees as is allowed
by the extensibility of the spring. Shock to the animals is thereby avoided so
that not only are the animals spared, but damage to the single-trees is avoided.
The double-trees hitherto employed had the disadvantage that in consequence
of the inertia of the vehicle there was always produced by the pull of the animals
a reaction, which did damage both to animals and to the parts of vehicles,
as the animals had to exercise a stronger pull and the parts had to be made
stronger.
These drawbacks are easily avoided by the present invention.
In the accompanying drawing
Fig. 1 is a side elevation and
Fig. 2 a plan of an improved equalizing-device according to this invention; in
the latter view the full lines indicate the position of the parts when the vehicle is
at rest, whereas the dotted lines show the position of the levers and spring when
the greatest effort is exercised as at the starting of the vehicle.
When a pull is exercised on the single-trees a a', the two double-armed levers ce¹
connected to the single-trees and pivotted on the fixed beam b turn according to
the resistance of the vehicle, thereby extending the spiral or other springs d as
shown by dotted lines in Fig. 2.
The spring is assumed to extend so much, that it is in equilibrium with the pull
necessary to start the load.
By the extension or compression of the spring which requires a gradually
increasing effort, a hard reacting shock is avoided and the animals are not tired
out by the slow and continuously exercised pull.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is ;-
1. The draught device characterized by the arrangement of single-trees (a a¹)
on double-armed levers (c c) which are pivotted on a fixed beam (b) and connected
by a spiral or other spring (d) whereby when the animals pull at the single-
trees (a a') they experience an elastic resistance and a reacting shock is avoided.

page_text: 2. The draught device substantially as described and illustrated in the accom-
panying drawings.
Din 15th dose of Cantambar 1906
BOULT & WADE,
Agents for the Applicant.