An Improved Lever and Pawl.
Year: 1896

page_text: Date of Application, 6th Nov., 1896-Accepted, 10th Apr., 1897
An Improved Lever and Pawl.
I, CHARLES COLTON LAMBERT, of Ashurst, in the Provincial District of
Wellington, in the Colony of New Zealand, Storekeeper, do hereby declare the
nature of this invention 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 my invention is to provide a lever and pawl which may be used
for many purposes where great power is required by simple means, and where a
moderate power is wanted at the commencement of, and a great one to finish, an
operation.
The object of my invention is accomplished by forming a slotted head upon the
end of a lever which is forked and provided with trunnions upon which it may
oscillate within suitable bearings. A nut having trunnions to receive connecting
links fits and is adjustable in the slotted head by means of a screw. The said
links at their outer ends carry a pin upon which a pawl and in some cases radial links
are pivotted in connection with a ratchet wheel.
In order that my invention may be most easily understood I will now proceed to
describe the same, reference being had to the accompanying drawings. Similar
letters refer to similar parts throughout the views.
Figure 1 is a side view of my invention.
Figure 2 is a plan of the same.
The lever (a) has a slotted head (6) and is forked at (a) and furnished with
trunnions (a 2) which may oscillate within any suitable bearings (c). A nut (d)
having trunnions (d) fits and may slide within slotted head (6) when screw (f)
is revolved by means of its square head (f). Connecting links (9) fit upon
trunnions (d) and at their outer ends have a piuion (9') to carry pawl (j), and
radial links (k) when a ratchet wheel such as (m) is employed. I have shewn and
described a ratchet wheel but it is obvious that the pawl may be used upon a rack
or other similar device.
From this description it may be seen that when lever (a) is oscillated the
connecting link (9) will reciprocate pawl () and revolve ratchet wheel (m).
On the drawings the nut (d) is shewn at its highest position or as far as possible
from the fulcrum of lever (a), but by turning screw (1) the nut may be lowered
and more power obtained as required, until a maximum is reached or until it
vanishes by placing the trunnions (d) of nut (d) so that they coincide with
trunnions (a 2) of lever (a).
The pawl has a number of fine teeth cut upon its working face to engage with
a corresponding number of teeth upon the ratchet wheel, and a maximum power
is obtained when one of these teeth is taken at a time by the pawl.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,
The improved lever and pawl, consisting of a lever having a slotted head, a nut
adjustable within the head by means of a screw. connecting links and a pawl,

page_text: constructed arranged and operating, substantially as and for the purposes set forth
herein and illustrated on the accompanying drawing.
Dated this 6th day of November 1896.
NEWNHAM BROWNE,
Agent for the Applicant.