Improvements in Monkey Wrenches.
Year: 1893

page_text: Date of Application, 10th July, 1893-Accepted, 12th Aug., 1893
COMPLETE SPECIFICATION.
Improvements in Monkey Wrenches.
A communication from EDWIN SYLVESTER PRATT, of the Town of Parry Sound,
in the District of Parry Sound, Province of Ontario, Canada, Engineer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
The object of the invention is to provide a monkey-wrench which can be adjusted
quickly for the purpose of suiting various sizes of heads or be adjusted like any
ordinary screw monkey-wrench, and it consists essentially of a monkey wrench
having its loose head adjusted upon the shank of the monkey wrench by means of a
screw arranged to be thrown in or out of connection with the rack substantially as
hereinafter more particularly explained.
Figure 1 is a perspective view of the improved monkey wrench with its screw
adjusted in position to work with the rack on the shank.
Figure 2 is a similar view with the screw thrown out of connection with the said
rack.
A is the shank made in the ordinary way and having a suitable rack B formed
on it.
C is a loose head connected to the shank A in the usual way.
D is a screw designed to mesh with the rack B. The screw Dis pivotted on the
plate E, so that it will revolve freely on its pivot. The plate E is connected to
the loose head C by means of a pin F. The plate E is carried in this manner so
that it may be swung on the pin F and thus carried clear of the rack B as indicated
in Figure 2. In the body of the loose head C is provided a spring-bolt G which
latches into a cup H formed in the plate E. When the plate E is adjusted to
cover the bottom of the loose head C, the spring-bolt G latches into the cup H,
thus holding the plate E from revolving on its pin F. When thus held, the screw D
engages with the rack B and thus the loose head C may be adjusted like any
ordinary monkey-wrench.
.
When it is desired that the loose head C should be moved quickly for the purpose
of adapting the wrench to suit different sizes of heads or nuts, it is merely necessary
to push upon the screw D or plate E so as to swing the said plate on its pin F and
carry the screw D clear of the rack B. A cup I is formed in the plate E which
receives the end of the spring-bolt G when the screw D is thrown out of contact
with the rack B and thus holds the screw in that position.
Having moved the loose head to suit the size of head or uut desired, the plate E
is swung back so as to bring the screw D into mesh with the rack B when the nut
may be used like any ordinary monkey-wrench. The spring bolt is sufficiently
strong to hold the screw D either in or out of position for adjusting the loose head C
but it is not sufficiently strong to prevent the screw D being thrown in or out of
contact with the rack B by the simple pressure of the thumb when it is desired to
quickly adapt the wrench to suit a head or nut of a different size.
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. A monkey wrench in which the loose head is adjustable upon its shank the
combination of a screw fitted into the rack on the shank and so carried that it may
be moved into and out of gear with the rack substantially as and for the purpose
specified.

page_text: 2. A monkey wrench in which the loose head is adjustable upon its shank the
combination of a screw fitted into the rack on the shank and so carried that it may
be moved into and out of gear with the rack and of a spring bolt for holding the
said screw into contact with the rack substantially as and for the purpose specified.
Dated this 10th day of July 1893.
W. P. THOMPSON & BOULT,
Of London, Nottingham, Liverpool, and Manchester,
Agents for the Applicant.