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Патент USA US2112055

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March 22, 1938. _
J. D. ‘TUCKER
\
2,112,055.
SINGLE CUTTER DIE
Filed May 14, 1937
INVENTOR
J. D. Tu 'cjcer
BYQV' '- ‘
ATTORN EY
Patented Mar. 22, 1938
Z,l12,055
2,112,055
SINGLE, CUTTER DEE.
Jesse 1). Tucker, North Sacramento, C‘alif., as
signor to‘ Tucker Gilmore Manufacturing Com
pany, a corporation
Application May 14, 1937, Serial No. 142,584
3 Claims. (C1. 10-111)
"Thisinvention relates to‘thread cutting dies in the previous die however it is to be under—
and particularly represents improvements over
the die shown in my Patent No. 2,052,587, dated
September 1, 1936.
“The main object of the present invention is to
retain all the advantages of the previous die,
while arranging the steady rest block so that it
has a better centering and holding action on the
part being threaded than in the previous device,
10 and which is designed so that the possibility of
scratching the metalor chipping the threads as
they are cut is avoided.
_
Also the leading end of the cutter block of the
die is formed with a lip of such a shape that the
15 use of lubricant in the operation of the die is
rendered unnecessary, which is especially of value
when working copper and the like.
The ?gure on the drawing is a front face View
of my improved die.
20
Referring now more particularly to the char
acters of reference on the drawing, the body 5
of the die is cylindrical as usual to ?t inv and
be engaged by a conventional chuck or stop, the
2
body being provided with a central opening ll.
Mounted in sockets 2 and 3 formed in the body
and disposed in diametrally opposed relation to
the opening 0 are cutting and steady rest blocks
d and 5 respectively. The adjacent ends of
these blocks project into the opening El and as
30 usual they are mounted in the sockets for slight
longitudinal adjustment.
The inner face of the cutter block ll is formed
with thread sections 6 which gradually increase
in depth along the block as is common practice,
35 so that the threads as cut in the bolt etc. will
be gradually increased to the full desired depth
from the inception of the cut. The arcuate'ex
tent of the cutting threads is approximately 100°,
with the greater proportion of such are on the
40 leading side of the median line 1 of the blocks
as shown.
The radius of the thread sections is the same
as that of the bolt to be threaded, but the thread
are is disposed slightly eccentric or offset from
45 said median line ‘I, said are diverging from the
leading end L to the trailing end of the cutter
relative to the bolt circle.
The adjacent face of the opposed rest block
5 is threaded as at t on the same radius as the
50 threads 6, but centered on the line i. The
threads 8 increase in depth from the outer end
of the block in the same manner as the threads
6, and are in position to properly cooperate with
said threads 5‘ so that they will enter the thread
55 grooves in the bolt as cut by the threads 6. As
stood that the threads 8 are not cutting but guide
threads only, having a close ?t with the cut
threads. This maintains the threads as cut in
perfect alinement and counteracts any tendency
of the thread to lead. ‘The arcuate extent of
the guide threads 8 is considerably greater than
that of the cutting threads, and approximately
135°.
'
- The leading end of the rest block and of its 10
threads lies approximately in a line 9 drawn
at right angles to the line "i and intersecting the
center of the threads 8, so that they are ap
proximately 45° from the trailing end of the cut
ter threads. With the guide threads being ap 15
proximately l35° in extent, the trailing end of
the rest block threads is thus disposed approxi
mately 60° from the leading end L of the cutter
threads.
By reason of this arrangement the bolt or the
like being threaded is supported and braced at
0
a point directly opposite to and even beyond the
leading end L of the cutter threads, so that such
bolt is adequately held in engagement with the
cutting threads in the inception of the cut as is
desired. The belt is also of course steadied at
all points opposite the entire arcuate extent of
the cutting block and its threads.
The leading end of the rest block being blunt
or radially cut, scratching or chipping of the
threads as they are cut in the bolt is avoided.
This feature is aided by the‘ proximity of said end
of the rest block to the adjacent end of the cutter
block, which prevents any possibility of lateral
deviation of the bolt out of axial alinement 35
with the rest threads.
The leading end ofthe cutter block is formed
relative to the thread circle as a sharp tapering
lip-as shown, which facilitates the entry of the
threads into the metal and avoids the need of
lubricant which is undesirable with certain
metals.
The opening it is enlarged outwardly of the
blocks on the leading side of the cutter block
as shown at IE! to provide for the escape of
the chips, such enlargement being actually un
necessary on the opposite side so that the body
l is never unduly weakened even though the en
largement it] is made of considerable size as may
be desirable to facilitate the free discharge of the
chips.’
‘
By reason of the speci?c features of construc
tion of the die as recited, it is much easier to
start than the conventional die, the threads on
the steady rest block acting as locators and feed
2,112,055
2
the threads in Without stripping, which is espec
ially advantageous at the start.
From the foregoing description it will be
readily seen that I have produced such a device
as substantially ful?lls the objects of the inven
tion as set forth herein.
While this speci?cation sets forth in detail the
present and preferred construction of the device,
still in practice such deviations from such detail
10 may be resorted to as do not form a departure
from the spirit of the invention, as de?ned by
the appended claims.
Having thus described my invention, What I
claim as new and useful and desire to secure
by Letters Patent is:
1. A thread cutting die including a supporting
body, cutting and steady rest blocks mounted in
the body in opposed relation to each other, and
cutting thread sections extending about the inner
face of the cutting block, the inner face of the
steady rest block being shaped to follow the
contour of and engage a portion of the circum
ferential surface of the member being threaded
and the leading end of said face being disposed
ahead of a line drawn diametrally from the
leading end of the thread sections.
2. A die as in claim 1 in which the rest block
at its leading end is out radially of the circle
of said inner face thereof.
3. A thread cutting die including a supporting
body, cutting and steady rest blocks mounted in 10
the body in opposed relation to each other, and
cutting thread sections extending about the in—
nor face of the cutting block and having an ar
cuate extent of substantially 100°, and guide
thread sections extending about the inner face 15
of the steady rest block and having an arcuate
extent of 135"; the trailing and leading ends of
the cutting and guide threads respectively being
spaced apart substantially 45°.
JESSE D. TUCKER.
20
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