OBTAI THE TRUE CENTRE OF ENDS OF ROUND AND SQUARE BARS OF METAL
Year: 1885

page_text: I WALTER TAYLOR of Wilton Hill Hawick in the County of Roxburgh Wood
Merchant do hereby declare the nature of my invention for OBTAINING THE
TRUE CENTRE OF ENDS OF ROUND AND SQUARE BARS OF METAL to be as follows:-
I WALTER TAYLOR of Wilton Hill Hawick in the County of Roxburgh Wood
Merchant do hereby declare the nature of my invention for OBTAINING THE
TRUE CENTRE OF ENDS OF ROUND AND SQUARE BARS OF METAL to be as follows:-
It is so constructed that when applied along the side of the bar, it will indicate
the centre on the end.
The advantages of the instrument will be a great saving of time in dealing with
bars requiring to be made round, such as shafting for machinery requiring to be
turned.
It will centre bars from one quarter of an inch-upwards-without having to
alter the Instrument for different sizes-and is easy of application.
The apparatus consists of two bars of metal A2 & A about 12 inches long by
1 inch broad, by inch thick.
From and near the top of the bar, A2 there projects 4 bars, E. E. e. e. about
5" or 6" long by inch square, all of them uniting into one square block, D. D.
through which the bar A2 passes.
Between the upper bars, E. E. and the under bars, e. c. there is a movable, circular
block, F. F. with groves in it near the two ends, into which the square bars, E. E,
e e. fits, and thereby allows it to slide backwards and forward, between the bars
according to the size of metal requiring to be centred.
This sliding block, F. F: carries with it a movable square or round punch, G.
which passes down through the centre of the sliding block, F. F. also within the
sliding block F. F. there is a spring acts upon the movable punch, G. and keeps it
always sustained in the block until it is required to give it a stroke with a hammer,
when the spring will be compressed and allow the punch to descend and centre the
bar, but on removing the hammer it will again spring back into its former position.
H. H. are two guides projecting in the same direction, and parallel to the four
metal rods, E. E. e. e. They diverge into two arms, Hl. H1, and making an angle
of about 60° with each other at I. I.
On the bar A there are also two guides C. C. the same as guides H. H. on bar A2.
K. K. are two square rods projecting from the block, L. in the same direction and
parallel to the guides C. C.

page_text: To use the apparatus take the bar to be centred B. and place it within the
guides H. H. which are connected to the bar A2. The other part of the apparatus
namely the bar A. and the projections connected to it, guides, C. C. and parallel
rods K. K. is then placed against the bar (or shafting) B. at the same time making
the two rods, K. K. pass on each side of the round sliding block, F. F. which is
carring the movable punch G. The same part of the apparatus A. and projections
connected to it, is now turned a short distance backwards and forward a few times
round the bar B. finally, turning it into the position of being at right angles to the
other part of the apparatus, namely bar A2 and all its projections. That is the
rods E. E. connected to the bar A2 should be at right angles or near-by with the two
rods K. K. connected to the bar. A. When it will be found that the movable
punch, G. is directly over the centre of the bar B. and then it may be struck with
a hammer as explained above.
It will thus be observed that it does not matter in what condition the end of the
bar may be, either uneven or probably pressed a little to the one side which may
happen, when being cut, it will still centre the bar if it's sides be evenly where the
guides are touching.

page_text: and Square Bars of Metal.
I, WALTER TAYLOR, of Wilton Hill, Hawick, in the County of. Roxburgh,
Scotland, Wood merchant, 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:—
My invention is for the purpose of guiding or holding a centre punch, so as
easily to indicate the centre of round, square, or other geometrically shaped bars,
or of crank shafts (as I find that the projection of a crank arm forms no obstruction
to the application of my device) which usually require to be centred, so as to be
turned in a lathe. My device is further adjustable, so as to suit and adapt itself in
the hands of the operator to any size or form of bar, and its application is
exceedingly simple, even in unskilled hands.
In order that my invention may be the better understood, I now proceed to
describe the same in relation to the drawing hereunto annexed, reference being had
to the letters marked thereon.
Figure 1 is a perspective view of my device, as applied to a round or other
shaped bar.
Like letters refer to like parts in the figure.
The apparatus consists of two bars of metal A¹ A2 of suitable dimensions,
according to the size of work to which it is to be generally applied. These bars
may be either round, or rectangular, as shown, or of any convenient shape, and may
be conveniently about 12 inches long with a section of 1 inch by a quarter of an
inch. Free to slide upon these bars or frames, but secured in position thereon
by set screws d, l, are fitted, at or near one end, a pair of slotted bars E K. Both
these bars are slotted in plan, so as to embrace a block F, and support the same in
a vertical position. One of these bars E is conveniently slotted also in elevation,
as well as plan, so that the other bar K can pass through the body of the bar E.
The bosses of these bars D L respectively, where they fit and slide upon the frame
bars A A, are fitted with set screws d, l, respectively, by which they may be
conveniently secured in place, but are still removable and adjustable at will. The
block F is a cylinder provided with grooves, in which the bars E K slide (or it
may be provided with collars) to keep it in place, and to ensure it being held
vertically, the circular section of the block F allowing the frames A¹ A' to swivel
at will upon it. It will be seen that the main frames A' A² can be approached
near to, or moved further away from the block F, which is free to slide in the
slots of the bars E K, according to the size of the work that is to be centred.
The sliding block F carries in it a movable centre punch G, of any suitable
section, which passes down through the centre of the said block, and which is
provided with a spiral spring f, which keeps the punch sustained in the block, until
t is required to effect the centring which is done by the blow of a hammer, the
unch thereafterwards springing back to its normal position. Upon the frame
ars A¹ A² are also fitted guides HH, projecting perpendicularly therefrom, and free
o slide upon the said frame bars A¹ A2, on which they may be secured in place

page_text: when desired by the set screws h, h. These projecting guides H H terminate in
forks, which may be constructed so as to diverge at any angle that may be found
most suitable. I find an angle of 60° to be most useful for centring round bars, but
an angle of 90° is required for square bars.
To use the apparatus,-place the bar to be centred within the guides H H, which
are connected to the frame bar A2. The other part of the apparatus, namely, the
frame bar A' and the guides HH and slotted bar K connected to it, is to be then
placed against the bar to be centred, making at the same time the slotted bar K
pass with its fork between the forks of the bar E, and so as to embrace the slide
block F, which carries the movable centre punch G. The frame bar A', and the
projections attached to it, is now turned through a short angle, backwards and
forwards, around the bar B, the guides H H being firmly pressed against the bar E.
Finally the two frame bars are conveniently placed at right angles to one another,
in position as shown in the drawing, and the centre punch is driven home in the
end of the bar E by the stroke of a hammer. It will then be found that the bar B
has been very accurately centred. It may be observed that any irregularity in the
end of the bar to be centred will not interfere with the accuracy of the centring,
and if the end of the bar be somewhat out of straight or uneven, it is evident
that my device centres the bar as nearly as possible with regard to the whole body
of the bar, upon which the guides H H are resting.
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
The construction of a centring device, consisting of a pair of frame bars upon
which are fitted, free to slide longitudinally and projecting perpendicularly, a pair
of slotted bars, embracing and holding the guide of a spring-pressed centre-punch,
and also fitted with two or more pairs of forked guides, projecting perpendicularly
therefrom, and free to slide longitudinally thereon, to effect the ceutring of bars of
any desired shape, substantially as described.
FELL & WILDING,
1, Queen Victoria Street, London, E.C.,
Agents for the Applicant.