Improvements in Jigs for Boring Bicycle Brackets and the like.
Year: 1896

page_text: Date of Application, 19th Dec., 1896
Complete Specification Lett 10th Feb. 1807 Accented 27th Mar 1207
PROVISIONAL SPECIFICATION.
Improvements in Jigs for Boring Bicycle Brackets and the like.
I, ALFRED HENRY MORTIMER CLOSE 22 Summer Row Birmingham Pattern
Maker, do hereby declare the nature of this invention to be as follows:-
To do this I cast a frame having a base and two upright sides at right angles to it,
these sides are thickened up with bosses for the purpose of carrying two moveable.
plugs which slide backwards and forwards and are fixed in position by screws or set
pins, one end of these lugs is for convenience operated on by a lever which is.
connected to it by a fork and pin and takes its leverage from a snug cast on the
frame, the top of this frame is flat, and I now make the drilling plate which slides
thereon and is governed by two slots and two pins, this drilling plate has the holes
in it in the exact position required to operate.
I place the bracket in position between the two above described plugs (whose ends
are shaped to enter readily the ends of the bracket). I close the plugs now together
by means of the lever and tighten them by the set pin.
The bracket being now in position I slide the drilling plate above it to its required
place and fix it by the pins and then proceed to drill through the holes in the top.
plate as my guide.
Dated this 17th day of December 1896

page_text: pin 15. The top of the frame is made flat to receive the drill guide plate 16, which
fatter is secured by pins 17, 17. In order to facilitate adjustment the holes 18, 18,
are made slotwise so that the plate may be adjusted in position. In the illustration I
have shown a bottom bracket 19 which is fixed in position by reason of the inner
ends of the plugs 9 and 10 fitting tightly therein, and by reason of the cotter hole
snug like projections 20 of the bracket, resting upon the adjustable plugs 21, 21.
In the drill guide plate 16, holes 22 and 23 are made which coincide with the cotter
holes 20 of the bracket 19. These holes are preferably provided by means of the
renewable bushes 24, the said holes being of such a size as to form a guide for
the drill.
Other similar drill guide holes may be formed in the plate 16 as may be desired,
such for instance as for oil holes &c.
It will now be seen that the bracket 19 may be readily fixed in the position shown
and the cotter holes or other holes, drilled straight away without further setting. By
then slackening the screw 11, and thrusting the lever 13 backwards the plug 10 is
withdrawn and the bracket 19 may be removed and the process repeated.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what I
claim is
1. The combination with the frame 6 having the sides 8 and plugs 9 and 10 and
supporting plugs 21, 21, of the drill guide plate 16, all constructed and operating
substantially as set forth and shown.
2. The general combination and arrangement of parts constituting this my
improved jig for boring bicycle brackets and the like substantially as set forth and
illustrated.
Dated this 9th day of February 1897
CHARLES T. POWELL,
12 Cherry Street, Birmingham, Applicant's Agent.