Improvements in Carpenters' Cramps, Spanners, and other similar Tools.
Year: 1894

page_text: Date of Application, 1st Jan., 1894
Complete Specification Left, 29th S pt., 1994-Accepted, 1st Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Carpenters' Cramps, Spanners, and other
similar Tools.
We JOSEPH LEAKE of 45 Northbrook Street Birmingham Engineer and
SAMUEL JAMES AINGE of 252 Icknield Port Road Birmingham Merchant do
hereby declare the nature of this invention to be as follows:-
We
Our invention consists in an improved method of retaining in the desired position
the moveable jaws of cramps, spanners and other similarly made tools without the
use of pins, wedges screws or other appliances at present in ordinary use.
attain this result by the following means namely, we form a number of teeth on
the blade of the tool with a corresponding set of teeth within the adjustable jaw
these teeth are kept interlocked by means of a spring also within the jaw and when
pressure is brought to bear on the jaw either by a screw as in the case of cramps
or of a nut in that of a spanner the teeth are made the more firmly to grip each
other and the tenacity of that grip is proportioned to the amount of pressure
against the jaw-and thus slipping is absolutely impossible.
Dated this First day of January 1894.
JOSEPH LEAKE.
SAMUEL JAMES AINGE.
Improvements in Carpenters' Cramps, Spanners, and other
similar Tools.
We JOSEPH LEAKE of 45 Northbrook Street in the City of Birmingham
Engineer and SAMUEL JAMES AINGE of 252 Icknield Port Road in the said City
of Birmingham Merchant 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 :-
Our invention consists of an improved method of retaining in their desired
position the adjustable jaws of cramps, vices, spanners and other similarly made
tools without the use of pins wedges or other appliances at present in ordinary use.
By the means which we employ the moveable jaw can be easily placed in the
requisite position in relation to the fixed jaw or head and when there it is so
firmly held in its place that no amount of pressure against it can cause it to slip.
That the construction and application of our invention may be more readily
understood we have attached hereto a sheet of drawings which we now proceed to
explain.
Fig. A. represents an ordinary carpenters cramp on the back side of which we
form teeth of any convenient shape or number.
Fig. A is a section of the blade of the cramp here illustrated but which may be
made of any other convenient section.
Fig. B. is the movable jaw which is internally furnished with one or more teeth
corresponding to those on the blade of the cramp. The jaw is likewise fitted with
a spring spiral or otherwise, and which is designed and intended by pressing on the
DQ17

page_text: upper edge of the blade to so lift the jaw that the teeth therein and those on the
blade of the cramp become interlocked.
Fig. C. is another view of the adjustable jaw shewing the teeth separated from
each other. This result is produced by pressing the hand on the top of the jaw,
whereby the spring is compressed and the bottom of the jaw is carried below the
serrated edge of the blade. The teeth being so separated the jaw can be moved
along the blade to any desired position.
Fig. D. is a section of the movable jaw showing the position of the spring and
one tooth.
Fig. D is a spring of the shape we prefer.
Figs. E and F are two other sections of the adjustable jaw shewing the recesses
formed in them for the reception of the blade and spring respectively.
Fig. G. is a loose cap attached to the end of the screw.
Fig. H. represents a spanner or wrench which is constructed in a similar manner
to the cramp hereinbefore described. In this case the pressure of the nut to be
turned against the moveable jaw converts it into a lever, the blade of the spanner
being its fulcrum this pressure of the nut so forces the teeth within the jaw into
those on the blade that the jaw is firmly retained in its position.
When the screw of the cramp is made to press against the door, shutter or other
object to be operated upon and which for that purpose is placed between it and the
movable jaw, such pressure is conveyed to the face of the adjustable jaw at a Fig. B
and would naturally push it backward on the blade but is prevented so doing by
the hold which the teeth have of each other, and the greater the force used the
more firmly do the teeth grip each other. A precisely similar effect is produced on
the moveable jaw of the spanner previously referred to, the pressure on the jaw
resulting in this case from the effort to turn the nut on the pin to which it is fitted
as previously described.
Having now fully described the nature of our invention and the manner in
which it is applied we declare that what we claim is
An improved and simple method of retaining in their position the adjustable jaws
of cramps, vices, spanners and other similar tools by means of teeth formed within
them corresponding with similar teeth formed on that side of the blade which
is opposite to and not on a line with the jaws of such tools and which being
made to interlock each other firmly hold them in their position as is fully
explained and set forth in the foregoing Specification and illustrated in the
drawings hereunto attached.
Dated this Twenty-eighth day of September 1894.
JOSEPH LEAKE.
SAMUEL JAMES AINGE.