IMPROVED METHODS OP APPLYING SPIRAL SPRINGS TO CARRIAGES FOR THE PURPOSE OF MORE EASILY RAISING AND LOWERING THE HEADS OF SAME, AND IN THE APPLICATION AND USE OF A NEW SCREW HEAD FASTENING FOR THE SAME PURPOSE
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by Edwin Harvic at the Office of
the Commissioners of Patents, with his Petition, on the 14th April
1875.
I, EDWIN HARVIE, of 164, City Road, in the County of Middlesex, do
hereby declare the nature of the said Invention for "IMPROVED METHODS
OP APPLYING SPIRAL SPRINGS TO CARRIAGES FOR THE PURPOSE OF MORE EASILY
RAISING AND LOWERING THE HEADS OF SAME, AND IN THE APPLICATION AND USE OF
A NEW SCREW HEAD FASTENING FOR THE SAME PURPOSE," to be as follows:-
The application of a spiral spring in four improved methods and
positions than any now in use, and the Invention and application of a
screw head fastening to the heads of double headed carriages, such as
landaus; this is a simple metal plate, in one end of which is a thumb-
screw with a shoulder on both sides of the plate, and working through a
hole in the plate. This plate is screwed to the inside of that half of the
roof which opens last, and a strap plate screwed to receive the thumb-
screw is fixed under that half which opens first. On the head being
closed the thumbscrew is turned into the strap plate or nut, and has the
effect of bringing the joint exactly to its place, on opening the head
the screw is turned the reverse way, and has the eflect of forcing up and

page_text: loosening the half which opens first, so that it may casily be thrown
open.
In applying the spring I enclose it in a tube with one end closed, and
in the other end insert a rod to fit the tube, wluch presses on the spring
as the head is lowered and compresses the spring; on the other end of
the rod is an eye which works on a bolt end or head prop, so that it may
adopt itself to any position as the head is raised or lowered. Numbers 1,
2, and 3, are fixed outside the head, as shown on the Drawings, and can
be applied to any carriage now in use without interfering with the head
covering, either inside or out; each of these methods have an eye at at the
closed end of the tubo, which works on a bolt end or head prop similar
to the rod at the other end, thus enabling the rod and tube to maintain
a straight position with regard to each other whatever position the head
may be in. No. 1 is simply the tube and rod with spring enclosed
placed upon head props as the joint would otherwise be, but with the
No. 2 is the same
prop or hoop stick or upper pillar very low down
thing applied to the upper end of head joint, the lower ond being
connected with the body below joint in pillar. No. 3 is one end
working on a head prop low down on upper pillar or hoop stack, the
other and working on a bolt end in the lower end of head joint, thereby
keeping the head up and the joint locked. No. 4 is fixed inside the
body, the lower end of the tube resting on the framework and the tube
fixed in a slanting position, the top end inclining towards the pillar
joint, the rod working on a bolt end attached to upper pillar or pillar
joint. In each of these methods the principle is the saine, the strength
of spring being adapted so that it is sufficient to keep the head but
not strong enough to resist a moderate pressure from the occupant of the
carriage who wishes to lower it.
up,
On the head being lowered the length of rod driven into the tubo is
increased, so that when it is down a very moderate effort is required to
raise it again