Improvements in Chucks for Lathes and other Machine Tools.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Chucks for Lathes and other Machine Tools.
I, JOHN COLLINSON HARRISON, of Stoney Cottage, Bowness-on-Windermere, in
the County of Westmoreland, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
The invention is designed to provide a chuck with reversible jaws, the jaws of
which can be readily and quickly reversed without knocking out pins or unscrew-
ing collars as has hitherto been the case.
In carrying out the invention I construct the face plate with the slots in which
the jaws slide to and fro sufficiently wide to permit the nuts of the clamping bolt
or stud to pass through and I form the washer which is placed between the nuts
and the back of the plate of oblong shape (rectangular or oval) the width being
such as to pass through the slot in the plate and the length to give a good bearing
surface on either side of the slot when the nuts are screwed up. Ribs or shoulders
or grooves of any suitable form may, if desired be placed on the back of the
plate to prevent rotary movement of the washer until the nuts are sufficiently
slackened to permit of disengagement with the rib.
The jaw screws for adjusting the position of the jaws are made with internal or
box squares instead of projecting squares as hitherto and such squares are formed
at both ends of each screw so that the screw thread extends to the end of the
screw.
The screws are fitted into the radial slots passing through the back lug of the
jaw and may be placed with either end towards the periphery a recess if desired
being formed at either end of the slot to receive the end of the screw.
The plate may be made with any suitable number of jaws and liners placed
behind the disc pieces at the ends of the screws or other means may be employed
to compensate for wear at the ends of the screws.
To reverse the jaws the jamb nuts at the back are slackened and the washer
plates turned 90° and the jaw and screw come out together when it can be replaced
and screwed up again.

page_text: COURCADO Ames and other Machine Tools.
I, JOHN COLLINSON HARRISON, of Stoney Cottage, Bowness-on-Windermere, in
the County of Westmoreland, Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:
-
The invention is designed to provide a chuck with reversible jaws, the jaws of
which can be readily and quickly taken off or reversed without knocking out pins
or unscrewing collars and screws as has hitherto been the case.
It consists essentially in constructing the face plate with slots sufficiently wide
for the retaining washers or plates to pass through; and holes in the periphery
for a key the end of which is of square or other section to pass and the sliding
jaws with adjusting screws with a square or other hole at each end to fit the key
and a retaining washer or plate which when in one position can pass through the
slots in the plate and when in the reverse position spans the slot and secures the
jaw when the nuts are screwed up.
The invention will be fully described with reference to the accompanying
drawings.
Fig. 1. Front elevation of chuck with one of the jaws in a reversed position
and two jaws removed.
Fig. 2. Side elevation partly in section.
The face plate A is constructed with grooves a between which the jaws B slide,
and slots C through which the socket D on the back of the jaw and the clamping
screws E pass.
The slots C I make sufficiently wide to permit the nuts e of the clamping screw
or bolt E and the retaining washer or plate F when in one position to pass. The
retaining or clamping washer or plate F is made of oblong shape (rectangular or
oval) the width being such as to pass through the slot C in the plate A and the
length to give a good bearing surface on either side of the slot when the nuts e
are screwed up. Ribs or shoulders or grooves of any suitable form may if desired
be placed on the back of the plate to prevent rotary movement of the washer until
the nuts are sufficiently slackened to permit of disengagement with the rib
The jaw screws G for adjusting the position of the jaws are made with internal
or box squares g instead of projecting squares as hitherto and such squares are
formed at both ends of each screw so that the screw thread extends to the end of
the screw.
The screws are fitted into the radial slots C passing through the sockets D at
back of the jaws B and may be placed with either end towards the periphery.
The holes H in the periphery of the plate A through which the key K is inserted
to reach the hole in the screws are preferably bushed with sleeves h. The inner
end of the sleeve h forms a bearing for one end of the adjusting screw G, and it
can be adjusted to compensate for wear by putting thin rings or risers behind
the flange.
The key K is made with square or angular ends to fit the internal squares g of
the screw G.
The face plate A may be made with any desired number of jaws B.
2
To remove the jaws B the nuts e at the back of the plate A are slackened and 4
the washer plates F turned 90° and the jaw screw plate and nuts come out together
when they can be replaced in the reverse position and screwed up again, or any or
all of them can be left off as desired.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
-
1. A chuck for lathes or other tools constructed with slots in the face plate
sufficiently wide to permit of the clamping nuts and washer to pass through,
clamping washers greater in one dimension than the other, adjusting screws with
internal or box squares at both ends and holes in the periphery of the plate through
which the key passes to the screws substantially as described.
2. A chuck for lathes or other tools having the several parts constructed and
arranged in combination substantially as described and shown.
נו מ
0011
WM. P. THOMPSON & Co.,
Manchester, Liverpool & London, Patent Agents.
WM. P. THOMPSON & Co.,
Manchester, Liverpool & London, Patent Agents.
WM. P. THOMPSON & Co.,
Manchester, Liverpool & London, Patent Agents.