Improvements in Adjustable Wrenches or Spanners.
Year: 1893

page_text: Date of Application, 20th July, 1893
Complete Specification Left, 21st May, 1894-Accepted, 30th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Adjustable Wrenches or Spanners.
JOHN HARRISON Wharf Road Stamford in the County of Lincoln Engineer
do hereby declare the nature of this invention to be as follows:-
An improved and novel method for adjusting fixing and moving the moveable
head or jaw of adjustable wrenches spanners and like tools also an improved
method for reducing the length of such wrenches when not in use.
The first part of my said invention consists of mounting a short screw or worm
upon the moveable head or jaw. This worm or screw may be made to engage with
suitable rack teeth cut in or formed on the shank or fixed part of spanner or
wrench. The teeth of the worm or screw do not quite encircle its circumference
sufficient space being left so that when in one position the teeth are clear of the
rack or teeth formed on fixed part of wrench. The object of this is to allow the
moveable head or jaw to be quickly and easily moved to any position on rack. The
teeth of the worm or screw are then turned to engage with teeth of rack which
secures the moveable head and allows a small exact adjustment by turning the
worm more or less and to facilitate this a thumb piece may be formed on or
attached to the worm.
The second part of my said invention consists of constructing the handle so that
it can be telescoped on to the shank of the wrench, a suitable stop being provided
to prevent the handle moving beyond the required positions.
Dated this 10th day of July 1893
J. HARRISON.
COMPLETE SPECIFICATION.
Improvements in Adjustable Wrenches or Spanners.
I JOHN HARRISON, of Wharf Road, Stamford, in the County of Lincoln,
England, Engineer 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 objects of my invention are, firstly, to provide means whereby the movable
jaw of a wrench or spanner may be quickly and easily, either raised or lowered
and adjusted to any position along the toothed rack of the spanner, and there
firmly secured to withstand the necessary strain, and secondly, in providing the
shank of the spanner or wrench with a telescopic extension, so that when the
spanner is not required for use, the extension may be slid or telescoped over
the shank, and thereby reduce the length of the handle.
But in order that my invention may be better understood I will now refer to
the accompanying sheet of drawings which are to be taken as part of this
Specification and read therewith.
Figure 1, is a perspective view shewing the spanner ready for use and Figure 2,
represents it closed up, when not in use, Figure 3, is a section of the telescopic
extension fitted over a portion of the shank of spanner, whilst Figures 4 and 5, are
respectively an elevation and plan of the device for adjusting and securing the
lower jaw of the spanner and Figures 6 and illustrate alternative arrangements.
Similar letters of reference indicate similar or corresponding parts where they
occur in the several views.

page_text: My first improvement consists in providing the movable jaw (A) of a wrench or
spanner (B) with a short screw or worm (C) to engage with a suitable toothed
rack (D) formed upon the shank (E) of the spanner. Said worm or screw (C) is
constructed so that the thread or threads (F) does or do not quite encircle the
circumference of the boss (G) sufficient space (H) being left to allow it to be
moved quickly and easily, either up or down the rack (D), and to obtain an exact
adjustment as also to secure the jaw (A) in position the worm or screw (C) is
partly rotated by manipulating the thumb piece (I) which is formed thereon.
My second improvement consists in providing the shank (E) of the wrench or
spanner (B) with a telescopic extension (J) in the upper portion of which is
-secured a flat spring (K) to engage with a shoulder formed by the recess (L) in
the shank, or in lieu of a flat spring I may use either a V shaped spring or any
-other suitable stop.
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,―
Firstly. The combination and arrangement with an adjustable spanner or
wrench (B) of a short screw or worm (C), formed, so that the thread or
threads (F) does or do not quite encircle the circumference of the boss (G) a
space (H) being left to allow it to be moved quickly and easily either up or down
the rack (D), and provided with a thumb piece (I) for the purposes herein
described and as illustrated in my drawings.
Secondly. The combination and arrangement with an adjustable spanner or
wrench (B) of a telescopic extension (J) provided with or without a spring (K)
for the purposes herein described and as illustrated in my drawings.
Dated the 19th day of May 1894.
W. D. ROWLINGSON,
Agent for Applicant.