IMPROVEMENTS IN APPARATUS FOR TURNING AND TIGHTENING KEYS IN BRASS AND OTHER METAL COCKS
Year: 1876

page_text: LETTERS PATENT to John Paterson, Engineer, 22, South Back of Canongate,
Edinburgh, for the Invention of "IMPROVEMENTS IN APPARATUS FOR TURNING
AND TIGHTENING KEYS IN BRASS AND OTHER METAL COCKS."
aled the 18th May 1877, and dated the 24th November 187
PROVISIONAL SPECIFICATION left by the said John Paterson at the Office
of the Commissioners of Patents on the 24th November 1876.
«IM-
JOHN PATERSON, Engineer, 22, South Back of Canongate, Edinburgh.
PROVEMENTS IN APPARATUS FOR TURNING AND TIGHTENING KEYS IN BRASS AND
OTHER METAL COCKS."
Hitherto the tightening of keys in brass cocks has been done principally by hand
labour, the head of the key being held in a vice while the cock is turned backwards
and forwards upon it by the action of the wrists of the workman. This has caused
considerable inconvenience and loss of time and even loss of material.
My Invention consists in an apparatus for doing the same work almost entirely
by machinery. It is well known that simple turning continuously in one direction
will not do so well, and I therefore have adapted machinery for giving the same
motion as is given by the wrist of the workman while it has the advantage of
performing the work better and quicker.
The apparatus which I employ may be attached to any ordinary lathe, or inay
be worked as a separate machine. It consists of a bracket which is attached to a
convenient part of the lathe or to a separate stand as may be desired, carrying in it
an axle or pinion with stud having on one end a holder (or centre as in a lathe) for
the square end of the key of the cock to be tightened, and on the other side a
toothed wheel. The other end of the key is kept in position by an ordinary holder
as in a turning lathe, the cock to be fitted being first put over the holder to enable
it to be operated upon as herein-after mentioned. The foresaid bracket has a
projecting lug also provided with a pinion which carries a segment or quadrant of a
toothed wheel of larger diameter than the one previously mentioned, and this
segment is so placed as to work into and operate upon the foresaid small toothed
wheel. The shaft of the foresaid segment is prolonged outwards beyond the pinion

page_text: carrying it, and is attached by a joint to a bar, crank, or lever working upon a
driving wheel or disc, but placed off the centre of the said driving wheel or dise so
as to operate as a crank.
By this apparatus a motion is given to the key, by which it is made to revolve
to the extent of about or little more than half a circle, and the cock being held by
the hands of the workman slightly but steadily against the key, the same motion is
imparted as when the cock is moved backwards and forwards by the hands of the
workman.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said John Paterson in the Great Seal Patent Office on the 23rd May 1877.
JOHN PATERSON, Engineer, 22, South Back of Canongate, Edinburgh.
"IM-
PROVEMENTS IN APPARATUS FOR TURNING AND TIGHTENING KEYS IN BRASS AND
OTHER METAL COCKS."
Hitherto the tightening of keys in cocks has been done principally by hand
labour, the head of the key being held in a vice while the cock is turned backwards
and forwards upon it by the action of the wrists of the workman. This has caused
considerable inconvenience and loss of time as well as loss of material.
My Invention consists in an apparatus for doing the same work almost entirely
by machinery. It is well known that simple turning continuously in one direction
will not do so well as the forward and backward turning by the workman, and I
therefore have adapted machinery for giving the same motion as is given by the
wrist of the workman, and which has the advantage of performing the work better
and quicker.
The apparatus which I employ may be attached to any ordinary lathe, or may
be worked as a separate machine, and it is shown on the annexed plan or Drawing
to which I now refer.
Figure 1 is the end elevation, and Figures 2 and 3 are the plan and front
elevation respectively of the apparatus, shewing the apparatus fixed to or in con-
nection with an ordinary turning lathe from which it may be conveniently detached
at pleasure.
The apparatus consists of a bracket A which is attached to a convenient part of
the lathe or to a separate stand as may be desired. This bracket A. carries in it an
axle or pinion B with stud, having on one end a holder (or centre as in a lathe) for
the square or operative end of the key of the cock to be tightened, and on the other
side a toothed wheel C. The other end of the key is, kept in position by an
ordinary holder as in a turning lathe; the cock to be fitted being first put over the
holder to enable it to be operated upon as herein-after mentioned. The aforesaid
bracket A has a projecting lug or arm F which is also provided with a pinion E, which
carries a seginent or quadrant D of a toothed wheel of larger diameter than the
toothed wheel C, and the segment D is so placed as to work into and operate upon
the aforesaid toothed wheel C. The shaft G of the aforesaid segment D is prolonged
outwards beyond the pinion E which carries it and is attached by a joint H to a
bar crank or lever J, which lever J works upon a driving wheel or disc K, and is
placed off the centre of the said driving wheel or disc K so as to operate as a
crank.
By this apparatus a motion is given to the key by which it is made to revolve
backwards and forwards to the extent desired, and which extent can be regulated
by means of a slot L in the driving wheel K, and the cock being held by the hands
of the workman slightly but steadily against the key, the same motion is imparted
as when the cock is moved backwards and forwards by the hands of the workman.
I do not claim any of the individual parts of the above described apparatus as new,
but what I do claim as the subject of my Invention is the combination of parts, or

page_text: any mere mechanical equivalent, substantially in the manner and for the purpose
herein-before described or any mere modification thereof.
In witness whereof, I, the said John Paterson, have hereunto set my hand and
seal, this Thirtieth day of April, in the year of our Lord 1877.
JOHN PATERSON
(1.5)