An Improved Boring Machine and Self Centering Chuck for same.
Year: 1891

page_text: Date of Application, 12th Jan., 1891-Accepted, 30th May, 1891
COMPLETE SPECIFICATION.
An Improved Boring Machine and Self Centering Chuck for same.
ABRAHAM SAVELLE of Church Street Coventry, 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 :-
My invention has reference to an improved boring machine and self centering
chuck for same and which is employed for boring and cupping ball sockets in
bicycle hubs or similar work, and by my improvements the operation of centering,
boring and countersinking the hub or otherwise is done in one operation, instead of
(as in the system generally in use) first to centre and bore the hubs or otherwise in
à lathe and then taken out and countersunk from the other side, but by my
arrangement the hub or otherwise is simply placed in my improved self centering
chuck and not removed till the whole operation is completed and thus is turned out
truer and much quicker than by the ordinary system at present in use, and in
addition as the machine is self feeding it requires a less skilled workman to operate
the machine.
The accompanying drawings represent at Figure 1 a general view of my improved
boring machine, shewing the general arrangement of the parts.
Figure 2 is a sectional end view of same.
Figure 3 a sectional plan view of the improved self centering chuck and shewing
the mechanism for actuating the jaws.
Figure 4 is a transverse section of the same.
Figure 5 longitudinal section of the chuck and shewing the steel jaws and
also the toothed driving wheel for putting the mechanism of the said chuck in
motion.
Figure 6 plan view of driving heads shewing the boring spindle and also the self
feeding and self stopping mechanism.
Figure 7 front elevation of same.
Figure 8 cross section of boring head and pedestal and a side view of the self
feeding and stopping spindle with its runner and locking nut, and also shewing the
driving cones and worm through the dotted lines.
In each figure the same letters indicate corresponding parts throughout the
drawings.
A body of the pedestal which carries the chuck and is secured to the bed of the
machine by means of the bolt B, the cast iron cap C is secured to the pedestal by
the studs D and the pedestal has a brass lining shown at E and this lining acts as a
bearing upon which the revolving parts of the chuck marked F rotates, and this
revolving part presses or bears upon the cast iron of the cap C except at the top
where a brass adjusting piece G, is placed, and this is secured to the cap C by
means of the screws H, and I is the screw which adjusts the brass lining G so as to
cause it to bear upon the rotating part of the chuck F as it revolves, in this
revolving part is cast a toothed wheel K and this is driven by a similar one L
which is keyed into the driving shaft M, upon one side of the revolving part F
a collar N (Figure 3) bears against the flanges of the brass pieces E and G
and upon the other side of F an adjustable nut or flange O is screwed and which
takes up the wear upon the face of the aforesaid brass pieces E and G. This
adjustable nut or flange is split so that when it has screwed the rotating part of
the chuck F up to its face it can be locked by the bolt P, inside F is a cast iron
disk R, and which carries the jaws of the chuck and these jaws are adjusted at equal
distance from the centre of the said chuck, S shews the wrought iron jaws and into
which are dovetailed the steel jaws T and these grip and hold the work, into the
wrought iron jaws two gunmetal nuts U are fitted and which carry the ends of the

page_text: right and left handed screw V, two plates W are used for taking the thrust of
the screw V. When it is made to revolve, in the centre of this screw is cut a
worm wheel X and which is geared into a worm Y cut on the shaft Z (Figures 1
and 3) this shaft is made with two square ends to allow a handle or spanner to be
fitted on either end, upon turning this shaft Z the worm Y, cut on same, in
revolving causes the worm wheel X of the screw V to also revolve and the screw
being cut right and left handed the two nuts U with the jaws S and T are brought
together or extended simultaneously and so grip the work or release it according to
which way the handle is turned. a. (Figure 4) are the shoulders for holding the
work in position in the self centering chuck and, (Figures 6, 7 and 8) is the
boring spindle which carries the twist and peg drill on the boring heads e, this
boring spindle is self feeding and self stopping the grooved piece d, which is
fastened on the spindle has a runner e, working in the groove fand in the slot, g
of the lever h, and this runner is adjustable in the slot, g, to allow long or snort
strokes to be given as required. The position of the groove f and slot, g, is shewn
in plan on Fig. 6 and in section on Fig. 7-and by dotted lines in elevation on
Figure 8. The lever is attached to the axis of the worm wheel ; of boring
head c (Figures 6 and 8) by a small locking bolt k so that when this worm wheel
revolves on its axis land which is also driven by a worm m on driving shaft, n, the
lever begins to radiate from the same point and the runner e moves slowly
along the groove and slot 9 till it reaches the curved parts of the piece d when
naturally its speed begins to decrease so that when the runner e has moved entirely
out of the groove f the spindle stops and is pulled back by hand ready for the next
operation.
j
I would here note that my invention though chiefly designed for boring and
cupping hubs of bicycles can be used for other and similar work.
And I would further note that the details may be varied without departing from
the general principle of my said invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I claim,
First. The general arrangement of the parts of the self centering chuck and the
mode of closing the jaws simultaneously by means of the worm wheel and right and
left handed screw and the worm on shaft to operate the same.
Second. The general arrangement of the self feeding and self stopping boring
apparatus for regulating the length of stroke of the cutting tool, and the driving
heads to operate the same, the whole substantially as above set forth and
described.
Dated this 19th 1
CT
By WALLACE WEATHERDON & Co.,
11, Southampton Buildings, W.C., Agents for the Applicant.