Improvements in Nut Tapping Machines.
Year: 1892

page_text: Date of Application. 2nd May, 1892
Complete Specification Left, 2nd Feb., 1893-Accepted, 11th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Nut Tapping Machines.
JAMES EDWARD CARTER of Craven Edge Halifax in the County of York,
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:-
Heretofore nut tapping necessitates the removal of the tap from the spindle after
one or more nuts have been tapped, whereas according to my invention the tap is
never removed or the machine stopped until the tap either breaks or worn too
small the nuts are put into a hopper brought into position for tap to enter tapped
and stripped from the tap without either stopping the machine or reversing the
rotation of the tap, with exception of putting nuts into hopper the machine is .
entirely automatic, the taps are more durable far less liable to breakage, the nuts
tapped are true not having to depend upon the bite of tap or careless attendant to
start the tap.
Machine constructed according to my invention consists of a hollow
vertical spindle mounted in suitable framework and driven by bevil or worm gear
according to the number of spindles on one machine, on the lower end of spindle
are two screw bushes one the pitch of thread of tap and the other a quicker thread
for withdrawing the spindle both bushes engaged in turn by a hinged nut caused
to engage with the bushes by means of a collar on the spindle operating an
adjustable stop and cam plate which releases one nut and engages the other, one
bush right and the other left hand thread.
In the upper end of vertical spindle forming the head I place two pair of gripping
jaws for holding the tap, the upper jaws take hold of the shank the distance from
thread to allow depth of nut to be tapped the second pair of gripping jaws are
placed below the upper pair sufficient to allow one or more nuts between the upper
and lower pair, these jaws are operated by adjustable double cam plates or grooved
inclined plates held in a sleeve or sliding collar which fits on head of spindle and is
free to be operated upon vertically by adjustable stops set according to size of
tap, as the spindle carrying the tap ascends and passes tap through the nut the
stop operates, the sliding collar the latter releases the upper gripping jaws which
are drawn back by spring where a double grooved cam is not used at the same
time closing the lower gripping jaws, sufficient dwell on the cam plates being allowed
to grip the tap before the upper jaws have released the tap and, visa versa, soon as
the upper grippers are released and the tap with spindle descends the nut tapped
falls and rests on the lower gripping jaws the point of tap being at the top and the
shank at the bottom, as the spindle descends the sliding collar comes in contact with the
lower adjustable stop which closes the upper grippers and opens the lower grippers
thus allowing the nut to fall into a hopper under machine, the rising and falling
motion of the spindle operates a weighted lever which by means of the vertical
arm and plunger puts a nut in position to be tapped, the nuts are placed in a hopper
on upper part of machine, a column of nuts resting on the plunger which is cut
the shape to receive nut so that as spindle ascends the weight operates lever which
brings plunger in position for another nut and when the spindle descends it operates
the opposite arm of 1 lever the latter by plunger puts nut in position for tap.
Date this 20th 1
1 1000

page_text: COMPLETE SPECIFICATION.
Improvements in Nut Tapping Machines.
JAMES EDWARD CARTER of Craven Edge Halifax in the County of York
Mechanical Engineer do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
-
Heretofore nut tapping necessitates the removal of the tap from the spindle after
one or more nuts have been tapped whereas according to my invention the tap is
not removed or the machine stopped until the tap either breaks oriworn too small.
The nuts are put into a hopper brought into position for the tap to enter, tapped
and stripped from the tap without either stopping the machine or reversing the
rotation of the tap. With the exception of putting the nuts into hopper the
machine is entirely automatic. The taps are more durable and far less liable to
breakage.
In order that my invention may be fully understood I have hereunto annexed
two sheets of drawings-in which
Fig. 1 is front elevation Fig. 2 is side elevation of machine constructed according
to my invention *th full size.
Fig. 3 is plan of hopper.
Fig. 4 is sectional elevation of head of spindle shewing grippers.
Fig. 5 is plan of Fig. 4 about full size.
Machine constructed to my invention consists of a hollow spindle 1 carried by
bevil wheel 2 the latter having extended bosses mounted in bearings 3. 4 of frame 5.
The spindle 1 receives its motion from the pulley 6 bevil pinion 7 and bevil wheel 2
the latter having a key which fits in the groove 8 of the spindle 1. In the upper
end of the spindle forming the head I place two pairs of grippers 9. 9 10. 10 for
holding the tap 11. the upper grippers 9. 9 grip the square formed on the tap shank
the distance from thread of tap to allow depth of nut to be tapped and thickness of
support for the nut. The lower grippers 10. 10 are placed below the upper
grippers sufficient to allow one or more nuts between the two sets of grippers
the upper & lower pairs of grippers are operated by adjustable double cam
plates 11 11 12. 12 held in sleeve or sliding collar 13 which fits on head of
spindle 1 and is free to be operated upon by adjustable stops 14. 14 15. 15. As
the spindle ascends with the tap and passes through the nut 16 the collar 13 comes
in contact with the stops 14. 14 which presses the collar down as the spindle ascends
thereby releasing the upper grippers allowing the spiral springs 17. 17 to withdraw
the grippers from the tap, at the same time the collar 13 by means of cam
plates 11 12 close the lower grippers 10. 10 before the upper grippers have
released the tap as the spindle 1 with tap descends the nut falls and rests upon the
lower grippers, the sliding collar comes in contact with the adjustable collars 15. 15
which by cam plates 11 11 12. 12 closes the upper grippers and releases the lower
grippers allowing the spiral springs 18. 18 to withdraw the grippers from the tap
thus allowing the nut to fall into hopper 19 under machine, the spindle is caused
to ascend by weighted lever 20 pressing against bottom of spindle. The spindle is
caused to descend by coarse thread 21 formed on lower part of spindle into and
gearing with worm wheel 22 and clutch boss 23. 24 on same axle as worm wheel 22,
as the spindle ascends the collar 25 on spindle comes in contact with adjustable
collar 26 which by lever 27 and lever 28 carrying clip 29 which fits in groove 30
of clutch boss 23, the latter having a key groove to fit a key on the axle of worm
wheel causes the clutch boss 23 to engage with the clutch boss 24 on worm wheel,
thereby stopping the rotation of the worm wheel and forming a nut, for purpose of
causing the spindle to descend, soon as the collar 25 comes in contact with
adjustable collar 31 the levers 27. 28 and clip 29 releases the clutch boss 23 from
boss 24 thus allowing the spindle to ascend by means of weighted lever 20 the

page_text: rising and falling motion of the spindle operates the lever 32 which by vertical
arm 33 plunger 34 puts a nut into position to be tapped the nuts are placed in
hopper 35 a column of nuts 36 rests on the plunger 34 the latter at its end nearest
the tap is recessed the shape of nut. As the spindle 1 with the tap ascends the
weighted arm 37 of the ☐ lever draws the plunger 34 so that its shaped portion to
hold the nut comes opposite the hopper 36 to receive a nut and when the spindle
descends the curved arm 38 of the 1 lever is operated by spindle head which in
turn operates the vertical arm 33 the latter by plunger 34 brings a nut into position
for the tap. The cam plates 11" 12 are adjustable by means of screws 39. 40. 41,
at 42 is groove pulley for driving pump 43 which by flexible tube and connection 44
connected to the upper part of nut holder base 45 thoroughly lubricates the tap
and cleanses it from cuttings.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. A tapping machine constructed as and for the purpose herein fully described
and illustrated.
2. The spindle 1 adjustable cam plates such as 11* 12 the grippers 10. 10 for
holding tap as and for the purpose herein set forth described and illustrated.
3. The combination of the hopper 36 plunger 34 operated by 1 lever 32 from
spindle 1 with the cam plates 11 12 grippers 10. 10 as herein described and
illustrated.
4. The adjustable stops or collars 15. 14 collar or sleeve 13 for opening and
closing the grippers 10. 10 in combination with the coarse thread 21 on spindle 1
worm wheel 22 clutch boss 23. 24 collars 25. 26 levers 27. 28 as and for the
purpose herein fully set forth and illustrated.
Dated this 1st day of February 1893.