Improvements in Wrenches.
Year: 1899

page_text: Date of Application, 24th Oct., 1899-Accepted, 16th Dec., 1899
Improvements in Wrenches.
I, FRITZ KETTLER, Manufacturer, and a Subject of the German Emperor, at
present residing in the City of Hagen, in the Province of Westphalia, in the
Kingdom of Prussia, part of the German Empire, do hereby declare the nature
of this invention and in what manner the same is to be performed to be particu-
larly described and ascertained in and by the following statement:—
This invention refers to wrenches and is particularly designed to construct a
wrench of great durability and by means of which a steady and always certain
grip can be secured upon the screw, nipple or the like to which the wrench is
applied.
My invention is illustrated in the accompanying drawings in which Fig. 1 is a
vertical longitudinal section of a wrench embodying my invention. Fig. 2 and 3
are cross sections upon the lines -, and y-y respectively of Fig. 1.
c is the upper jaw of the wrench, provided with a stem a at the bottom thereof.
Said stem a is of equal diameter throughout its whole length and of practically
round shape, but flattened off at the opposite sides so as to be of symmetrically
oblong shape in cross section. f are screw threads at the lower extremity of the
stem. is the lower jaw of the wrench provided with a hole smoothly fitting the
stem a so as to secure the latter against rotation within this jaw thereby also
preventing any displacement of the jaws which are always kept in exactly parallel
planes. e is a handle attached to the lower jaw by the screws p the said screws
entering an annular groover of the said handle e which is hollow for the recep-
tion of the stem a; the latter snugly fitting into the bore of the hollow handle e.
Flat threads are cut at the inside of the wall of the middle part of the handle
to correspond with the threads f of the stem a. By turning the said handle e, the
stem a with its jaw c will be removed or brought nearer to the lower jaw bat will.
My invention obviates the difficulties presented by the wrenches used hereto-
fore which owing to the stem or projection serving for the attachment of one of
the jaws consisting of an upper cornered part of greater diameter and a lower
screw threaded part of smaller diameter very often gave away or got loose or dis-
placed upon greater purchase being applied to the wrench. "In the wrench con-
stituting my invention there is absolutely no weakening of parts and owing to
the combination of the peculiarly shaped stem a with the handle e the jaws are
always kept strictly parallel to each other.
s is a hole for lubricating the device that may be closed by the screw t.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. Wrench with adjustable jaws, comprising an upper jaw c, a stem at the
bottom of said upper jaw, said stem a being of equal diameter throughout and of
practically circular cross section with opposite flattened sides, the said stem

page_text: smoothly fitting into an opening of the lower jaw, substantially as and for the
purpose set forth.
2. Wrench with adjustable jaws, the upper jaw bearing a stem (a) reaching
through an opening of the lower jaw, the middle part of said stem being of oblong
cross section and screw threaded at its lower extremity, a handle (e) surrounding
the said stem and bearing interior screw threads in its middle part and means
for fastening the handle to the lower jaw of the wrench, substantially as and for
the purpose set forth.,
Berlin, Germany, this 19th day of October 1899.
WALTER FALKMAN,
Agent for Applicant.