Improvements in Spanners.
Year: 1898

page_text: Improvements in Spanners.
We, FREDERICK PERTWEE, of 69, Lombard Street, Merchant, and CHARLES
BAXTER, of 6A, Austin Friars, Engineer, both in the City of London, do hereby
declare the nature of this invention to be as follows:-
1
Our invention relates to an improved claw spanner provided with means for
adjusting the same to suit nuts of different sizes.
A spanner constructed according to our invention has a frame to which the
lever portion of the spanner is fixed and in this frame is pivoted a recessed plate
which forms one of the jaws of the spanner the other jaw of the spanner being
formed by an arm which is also pivoted in the frame and the free end of which
co-operates with an inclined surface upon the plate carrying the first mentioned
jaw in such a manner that when the said first mentioned jaw is moved the other
jaw will follow the movement so that the adjacent surfaces of the two jaws will
remain parallel. As the inclined surface upon one jaw will only move the other
jaw in one direction suitable means such as a link are arranged between the
pivoted plate and the pivoted jaw in such a manner that the movement imparted
to the one will be communicated to the other.
To the pivoted plate is connected a screw rod or other device for adjusting the
spanner.
1011
1
1
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.
Improvements in Spanners.
We, FREDERICK PERTWEE, of 69, Lombard Street, in the City of London,
Merchant, and CHARLES BAXTER, formerly of 6A, Austin Friars, now of 14, Coventry
Street, in the County of London, 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:-
Our invention relates to an improved claw spanner provided with means for
adjusting the same to suit nuts of different sizes.
A spanner constructed according to our invention has a frame to which the
lever portion of the spanner is fixed and in this frame is pivoted a recessed plate

page_text: which forms one of the jaws of the spanner the other jaw of the spanner being
formed by an arm which is also pivoted in the frame and the free end of which
co-operates with an inclined surface upon the plate forming the first mentioned
jaw in such a manner that when the said first mentioned jaw is moved the other
jaw will follow the movement so that the adjacent surfaces of the two jaws will
remain practically parallel. As the inclined surface upon one jaw will only
move the other jaw in one direction suitable means, such as a link, are arranged
between the pivoted plate and the pivoted jaw in such a manner that the end of the
jaw is kept in contact with the inclined face of the pivoted plate.
To the pivoted plate is connected a screw rod or other device for adjusting the
spanner.
In the accompanying drawing:-
Figure 1 is a sectional side elevation of a spanner made according to our
invention:
Figure 2 is an edge view thereof:
Figure 3 is a section on the line 3–3 Figure 1; and
Figure 4 is a section on the line 4-4 Figure 1.
e is
it is the frame to which the lever portion 6 of the spanner is fixed and c is the
recessed plate which forms. one of the jaws c of the spanner, the said plate being
pivoted at to the frame a as clearly shewn. d is the arm forming the other
jaw of the spanner, the said arm d being also pivoted to the frame a at
the inclined surface upon the plate e with which the free end of the armi d
co-operates in such a manner that when the jaw c¹ is moved the other jaw d¹ will
follow its movement so that the said two jaws c¹ and are always parallel.
fis the screw-rod by means of which the plate c is moved to adjust the spanner
to take any particular nut, the said screw-rod f being pivoted at f¹ to the said
plate c and being operated by a nut f which projects through recesses in the sides
of the lever portion 6 of the spanner.
With this arrangement it will be obvious, as above mentioned, that by turning
the nut f so as to move the screw-rod f upwards, the said screw-rod forces the
plate e around its pivot as shewn by the broken lines in Figure 1, the movement
of the said pivoted plate c causing the arm d to correspondingly move by reason
of the contact of its free end with the inclined surface e formed upon the said
plate c, so that the two jaws c¹ and remain parallel with one another whatever
the position to which the pivoted plate c is moved by the said screw-rod f
The inclined surface on the pivoted plate c only operates the arm d in one
direction and to enable the free end of the arm à to bear against the said inclined
surface at any position of the pivoted plate, suitable means are provided as here-
inbefore mentioned: Such means preferably consist of the spring link g, which
connects the 'arm d and the pivoted plate cas clearly shewn, the said link g being
made elastic to counteract any inequality in the relative movements of the free
end of the arm & and the points of attachment of the said link g.
Having now particularly described and, ascertained, the nature of our said inven-
tion and in what manner the same is to be performed; we declare that what we
claim is:
-
1. A spanner comprising a frame to which is pivoted a recessed plate forming
one jaw of the spanner and an arm.
n. forming the other jaw of the spanner, the free
end of the said arm resting upon an inclined. surface upon the pivoted plate which
is provided with means for moving it around its pivot, substantially as herein before
described.
2. In a.spanner, the combination of a frame, of a pivoted recessed plate forming
one of the jaws and having an inclined surface, of an arm pivoted to the frame, the
free end of which rests upon the said: inclined surface, of a screw-rod pivoted to
the pivoted plate and adapted to be operated by a fixed nut, and means, such as
a link, connecting the pivoted arm. and the pivoted plate, substantially as herein-
before described and illustrated.

page_text: 3. The combination and arrangement of parts forming the improved spanner,
herein before described and illustrated in the accompanying drawing.
Dated the 19th day of Anil 1900
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.