IMPROVEMENTS IN TRANSMISSION OF MOTIVE POWERARA FOR REG
Year: 1881

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex, for an
Invention of "IMPROVEMENTS IN
TRANSMISSION OF MOTIVE POWER."
Bernard Roussille, of Saverdun, France.
APPARATUS FOR REGULATING THE
A communication from abroad by
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 21st December 1881.
HERBERT JOHN HADDAN, of Kensington, Middlesex. "IMPROVEMENTS IN
APPARATUS FOR REGULATING THE TRANSMISSION OF MOTIVE POWER." A com-
munication from abroad by Bernard Roussille, of Saverdun, France.
This Invention has for its object to regulate the transmission of power to
machines and consists chiefly of an escapement wheel and a pawl made to gear
into the said wheel by a spring, when the latter is not set out of action by an
excess of force. The escapement wheel is enclosed in a box and is mounted on a
spindle passing through the sides of the latter, while the pawl consists of a lever
pivoted at one end to the face of the box and connected with the other end to a
spring located at one end of the box, and serving to draw the pawl against the
wheel. The lever has near its centre a tooth provided with a friction roller which
rests against a tooth of the escapement wheel. On the side opposite to the spring
a triangular-lever is pivoted to the box, one side of the lever being provided with
a series of perforations for attaching the motive mechanism, while the other side
has perforations for connecting the triangular-lever to the free end of the pawl by
means of a wire or cord. The spindle of the escapement wheel carries outside the
box a ratchet wheel into which gears a pawl pivoted to the box. As long as the
power transmitted to the triangular lever is normal, the pawl remains in gear with
the escapement wheel, but as soon as an excess of power occurs, the traction of the
spring is overcome and the pawl drawn out of gear, thereby allowing the escapement
wheel to turn independently of the pawl

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddan in the Great Seal Patent Office on the
20th June 1882.
HERBERT JOHN HADDAN, of Kensington, Middlesex. "IMPROVEMENTS IN
APPARATUS FOR REGULATING THE TRANSMISSION OF MOTIVE POWER."
A com-
munication from abroad by Bernard Roussille, of Saverdun, France.
This Invention has for its object to regulate the transmission of power to
machines, and it consists chiefly of an escapement wheel and a pawl made to gear
into the said wheel by a spring, when the latter is not set out of action by an
excess of force.
In the accompanying Drawings Fig. 1 represents the regulating mechanism (5)
as applied to horse driving gear. Fig. 2 the same applied to a vertical line of
shafts, driven by any motive power, while Figs. 3 to 6 show the regulating
mechanism in detail.
The apparatus_Fig.-1-consists-of-a-frame-supporting-or-uniting-the-following
mechanism:
(1). The regulating mechanism (5) represented by Figs. 3, 4, 5 and 6.
(2). A vertical driving shaft carrying the beam b, the regulating gear (5) and
the tooth-wheel d.
(3). The beam b to which the horses are attached.
(4). The piece c serving to connect with the mechanism (5) by means of the
hook e.
(5.) The driving wheel & transmitting the motion to the pinion f and thereby to
the horizontal shaft g.
The shaft a passes through the central opening of the wheel S Fig. 6, and
transmits the rotary motion of the said wheel to the wheel d; the other end of the
mechanism (5), that which receives the motive power, is connected with c by
means of a hook e. The beam bis mounted loose on the shaft a, so that it can be
turned without imparting motion to the shaft a, except through the piece c, which
is rigidly fixed to the beam b and may be considered as of one piece with the
latter.
In Fig. 2 motion is transmitted from the shaft / to the shaft a through the arm
or crank b, provided with the block c, and the regulating mechanism (5). This
mechanism is constructed as follows:-
On the shaft a is mounted the tooth or escapement wheel S, for which an opening
is provided in the box 5. A lever pivoted to the box at q is provided at or
near its centre with a projection carrying a friction roller t, while the free end of
the lever is connected by a cord with a spring attached to the top of the box,
and by another cord with the side a¹ b₁ of the triangular lever m which is pivoted
at q' to a beam or bracket attached to the box.
The front of the shaft a carries a ratchet wheel n into which gears a spring
catch o pivoted to the front of the box 5, while the back of the box is covered
with a plate outside of which there is a washer p mounted on the shaft a.
The
roller t is in contact with a tooth of the wheel S, and the box 5 is provided with a
second opening d'. e'. f'. g¹. to give room for the motion of the lever.
The side b¹c' contains a row of holes cach of which fits the pin of the con-
necting rod, and the side a' ba row of holes for the hook to which the cord is
attached, so that by using the one or the other of the said holes the rate of
transmission can be altered.
In operation a connecting rod or equivalent device acts on the side b¹ c' of the
triangle in the direction of the arrow, thereby causing the whole apparatus to

page_text: revolve with the shaft a and producing a strain in the cords which is balanced by
the spring, the roller t pressing against a tooth of the wheel S, thereby setting in
motion the shaft a. As soon as an excess of power is exerted on the triangle m
the strain in the cords will overcome the spring thereby pulling down the lever r
and allowing the roller t to pass over the teeth of the wheel S until the power has
again become normal and the roller rests before another tooth.
The tooth-wheel n has the same number of teeth as the wheel S, and is placed
in such a manner that one of its teeth rests against the spring catch o as soon as
the roller t escapes from a tooth of the wheel S. This spring catch has sufficient
strength to give a small impulse to the wheel n and consequently to the shaft a
after the rollert has escaped from a tooth of the wheel S. The release of the
spring from a tooth of the wheel n is to take place as soon as the roller t has
taken its place before another tooth. A signal bell may be connected with the
spring and set in action as soon as the spring is depressed by an excess of
ומעnd
H. J. HADDAN. (L.S.)