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Патент USA US2403484

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July 9, 1946.
Filed Nov. 4, 1943
Patented July 9, 1946
2,403,484 V
Handel Ashworth, Baldwin, N. Y.
Application November 4, 1943', Serial No. 508,942
2 Claims.
(or. 10-136)
generally vertically arranged body l9 having a
pedestal 29 at the lower end thereof.
The body l9lis provided with a horizontally ar
ranged bearing 2| in which is slidably and rotat
This invention relates generally to the art 0
tapping and threading and more particularly to
an improved automatic threading and tapping
ably mounted a drive shaft 22. The shaft 22 at
Among the principal objects of the present in CR the forward end thereof carries the driver chuck
vention lies the provision of a tapping and thread~
H, which may be ofany well known construc
ing machine which produces work of a high de
tion. The rear portion of the drive shaft 22 as
gree of accuracy comparable to that produced by
previously described is rotatably and slidably»
accurate screw thread cutting lathes.
mounted in the bearing 2! and has keyed thereto
Another object herein lies in the provision of I
a machine of the class described by the use of
which, after the initial adjustments have been
made, a large number of uniformly tapped or
threaded articles may be produced, even though
the skill or experience of the operator be of low 15
A still further object of the present invention
lies in the fact that adjustments in the machine
to accommodate the same to changes in the type,
a .pair of driver discs 23 and 24. The upper por
tion,25 of the body it extends above the bearing
2! and has a vertically arranged bearing 26 with
in which is mounted the vertical drive shaft 2?.
The shaft 21 is free to rotate in the bearing 2%
and has keyed thereto a disc 28 with a rim of fric
tional material 29 as for example, rubber or
leather. The diameterof the. disc 28 is slightly
less than the distance between the discs 23‘ and
may be quickly and conveniently made,‘ without
24 so that the discs 23 or 24 may alternately con
tact the rimof frictional material 29 as the drive
shaft 22 is horizontally reciprocated as will he
the use of tools or special skill.
A feature of the invention lies in the fact that
more fully described hereinbelow. The tool
holder I'E‘includes a cup shaped member 39 which
size, or kind of the work piece operated upon
as each piece has the work thereon ?nished, it
may be quickly removed and a new unworked
piece secured in its stead, so that rapid large scale
production is provided.
These objects and other incidental ends and
advantages will more fully appear in the progress
of this disclosure and be pointed out in the ‘ap
pended claims.
‘ '
In the drawing, in which similar reference char
acters designate corresponding parts throughout
the‘ several views:
Figure 1 is a fragmentary side elevational view
of a preferred embodiment of the invention, cer
acts as a socket or receptacle for the threading,
die It.‘ The die [8 is ‘detachably engaged within
the receptacle 3B byv means of set screws 3! in
a well known manner. The receptacle 3!) has an
integral rearwardly and‘ horizontally extending
shank 32 which is loosely ?tted within the bore
33' in‘theso‘cket‘joint 34. The rear end of the
shank'32' isv provided with an enlargement 35
which engages a correspondingly enlarged portion
in the stem 36 of the socket joint 3d so that the
_ shank '32 may shift slightly in any radial direc
tion with respect to the stem 36. The rear surface
of the receptacle 3!} ‘is provided with a pair of
diametrically arranged and rearwardly directed
Figure 2 is a fragmentary plan view of Figure 1.
drive pins 31 which are adapted to abut against
In accordance with the invention the thread
a pair of similarly disposed pins‘ 38 projecting
ing and tapping machine generally indicated by
from the front face 39 of the disc-like body llil
numeral [0 comprises a base H, a bed I2, a car
of the socket joint 34.
riage l3, a work holder M, a reversible driver
The bed l2 includes a front upright plate M
I5, a tool holder [6 and driver chuck l1.
and a rear upright plate 42. The plates M and
As shown in the accompanying drawing byway
45 4%! are secured to the upper surface of the base
of example, the machine is set up in such a man
II in any‘suitable manner. Between the plates
her as to illustrate, the use thereof in ‘a thread
4! and 42 are a plurality of guide rods 13,14 and
ing operation. As will be obvious to those skilled
‘iii. The guide rods ‘it-‘J5 inclusive, are dis
in the art to which the present invention relates,
posed in spaced and parallel arrangement, sus
the tool holder [6 may have substituted therefor
pended from and‘ ?xedly secured to the plates
a similarly constructed tap’ (not shown). As will 50 ill and 12-2- in. any suitable manner as' for ‘example,
be apparent in the course of this disclosure, such
icy-threading the ends of ‘the rods ‘as indicated at
substitution of a tap for the threading die. I8
numerals 43—d3=inclusive, and securing ‘the rods
may be simply and easily accomplished.
in place‘ by means of- nuts threa'dedly engaged
As best seen in the right-hand portion of Fig
ures 1 and 2‘, the reversible driver l5 includes a
tain parts being shown in section.
The carriage [3 includes a body 49 having a
plurality of bearings 59, 5| and 52 at the lower
most portions thereof. The bearings 50—52 in
clusive are penetrated by the guide rods 43—45
inclusive respectively, and said bearings as well
as the carriage l3 have longitudinal horizontal
rectilinear movement therealong. The upper
portion of the body 49 is enlarged to form the
56 and to securely clamp the work piece 65 within
said collet. The carriage I3 is now moved rear
wardly or toward the driver [5. As soon as the
rear end of the work piece 65 contacts the coni—
cal portion 86 of the die I8 this causes the stem
39 and the drive shaft 22 to move rearwardly
(toward the driver [5). This rearward move—
ment results in the rear surface of the disc 23
head 53. The head 53 is provided with a hori
contacting the rim 29 of the disc 23 causing the
zontal longitudinally directed bore 54 the rear 10 rim and the parts directly and articulately con
portion of which may be outwardly tapered to
nected thereto to rotate in the direction of the
receive the taper sleeve 55, within which is dis
arrow 81. The threading operation is continued
posed the split tapered collet 56. The rear por
for the requisite depth or extent upon the piece
tion of the collet 56 has an externally threaded
65 when rearward pressure upon the clamping
hollow neck 51 adapted to be threadedly en 15 wheel 60 or the carriage I3 is stopped. This
gaged by the internally threaded bore 58 of the
stoppage will result in a separation or slippage
hub 59 of the work clamping wheel 66. The outer
between the disc 23 and the rim 29 and a cessa
cylindrical surface of the hub 59 is journaled
tion of the threading operation. At this point
the screw 16 and/or the stop 19 are adjusted in
?ange 6| which is rotatably positioned within the 20 position with relation to each other and to the
retainer ring 62. The said ring 62 is secured to
rod 15 so that further rearward movement of the
the rear surface of the head 53 by the bolts 63.
carriage I3 is prevented. This last described '
Thus,’ the hub adapted for rotation about a
setting operation of the bolt ‘l6 and the stop
horizontal axis within the head '53 but is incapa
19, as well as the setting of the bolt 69 need
ble of axial movement with relation thereto.
25 only be done once for the first work piece in any
The clamp wheel 60 in the hub 59 thereof is
series of identical work pieces.
provided with means 64 to axially position the
After the work piece 65 has been properly
work piece 65 within the collet 56. Said means
threaded at the rear end thereof forward motion
includes a threaded bolt 69 having a head 66 at
of the carriage 13 or the hand wheel 69 will pull
the front end thereof and a rounded terminal
the disc 24 into contact with the rim 29 resulting
6'! .at the rear end thereof. The bolt 69 is
in a reversal of the motion of the parts as con
threadedly engaged in a central ori?ce 68 in the
trasted with that previously described. Assum
hub 59. The bolt 69 is secured in any longi
ing the thread on the end of the work piece 65 to
tudinally adjusted position thereof by means of
be a normal right hand thread, this forward mo-.
the lock nut 10.
35 tion of the work piece will cause the die It to be
Detent means generally indicated by numeral
come unthreaded from the piece 65. It now be
1| to limit the movement of the carriage I 3
comes a simple matter to rotate the clamp wheel
toward the threading tool or tool holder I 6 are
60 in an opposite direction, to remove the work
positioned upon the guide rod 15 and include
piece 65 and to replace it with a fresh or un
the bolt 16 which is threadedly engaged in the
treated piece corresponding to the work piece 65.
body 49 of the carriage l3 in the lower right
It may thus be seen that I have disclosed a
hand portion thereof. The bolt 16 is provided
novel and useful threading and tapping machine
which is readily adapted for treating a large
with an enlarged head 11 and a rounded rear
terminal 18. The stop 19 has a bearing 80 at
number of pieces in quick succession and which
the lower portion thereof which is slidably posi
after a simple series of setting operations pro
duces a plurality of parts having uniformly
tioned upon the guide rod 15 and may be ?xedly
secured in ‘any longitudinally adjusted position
worked characteristics with relatively low’degree
thereof by means of‘the set screw 8!.
of tolerances in conformity between individual
parts treated.
By reason of the adaptability of the present
not de
device it may be used in various manufacturing
machining operations. For the purpose of clar
sire to be limited to the exact details of construc
tion shown and described, fOr obvious, modi?ca
ity in the present disclosure, however, one mode
tions will occur to a person skilled in the art.
of operation is here given. The base ll may be
In the following claims, the expression thread
suitably secured as by clamping to any working
55 ing tool is intended to refer to a tool capable of
surface as for example, a table of a drill press
cutting or applying threads either to a male or
(not shown). The vertical drive shaft 21 may be
female member so as to provide a threading or
engaged within a chuck of a motor-driven drill
in the bore 54, and is provided with a peripheral
press or may be connected to any other suit
able prime mover such as an electric motor (not
tapping operation respectively.
I claim:
1. A machine of the class described for thread
shown). Assuming shaft 21 to be rotating in the 60
ing a work piece comprising, a carriage, a head
direction indicated by arrow 85 with the discs
forming a part of said carriage and having a bore
23 and 24 disengaged from the disc 28 the device
therein, a collet associated with said head and be
will be in a neutral condition. Assuming that a
threading operation is to be performed, the die 65 ing seated in said bore, a wheel having a hub to
operate said collet for adjusting said work piece
I8 is secured within the receptacle 30 by manipu
in said collet, a screw cutting tool, reversible
lation of the set screws 3! and the stem 36
driving means for rotating said screw cutting tool
is engaged by manipulation of the chuck [1. As
in either direction, means to mount said carriage
suming a. work piece like the piece 65 for exam
ple, the bolt 69 is adjusted in position by rotat 70 for movement toward and from the screw cutting
tool, and adjustable stop means to limit the move
ing the head 66 thereof so that the proper amount
ment of the carriage toward the screwcutting
of the work piece 65 will project from the front
face of the collet 56. After the bolt 69 is prop
2.‘ A screw cutting machine comprising'a driv
erly adjusted the lock nut 10 is tightened. Now
ing shaft, a pair of driving members thereon, a
the clamp wheel 69 is rotated to close the collet 75. rotating'wheel
for engagement with either of said
drive members, said shaft being axially movable
to permit driving engagement of either of said
depth of insertion of a series of given work
pieces into said collet bore, means for supporting
members with said wheel thereby to reverse the
direction of rotation of said shaft, screw cutting
means carried and driven by said shaft, a work
piece holding collet having a work piece holding
bore, means to contract the bore in said collet
thereby to hold a work piece substantially in axial
alignment with said screw cutting means, a stop
for causing engagement of a work piece with said
screw cutting means and for causing selective
engagement of said members with said wheel,
and means to limit the degree of movement oi
said axially slidable supporting means to deter
member which may be pre-set to determine the 10
said adjustable collet and being axially slidable
mine the extent of the screw cutting operation. _
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