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Патент USA US2128032

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Aug. 23, 1938.
w. 'r. WEHMAN
MANDREL BAR CAP ’
Filed Jan. v25, i938
2,128,032
Patented Aug. 23, 1938
_ 2,133,032
UNITED STATES PATENT OFFICE
MANDREL-BAR CAP
William T. Wehman, Eiyria, Ohio, assignor to Na
tional Tube Company, a corporation of New
Jersey
‘
Application January 25, 1938, Serial No. 186,879
3 Claims.
A tube mill is ordinarily provided with man
(Cl. 78-193)
'end of the pin 1 is seated in the tapered hole‘ 6 of‘
the member-4. This opening 9 provides a passage
work diameters. These mandrels are fixed to for a wedge III which may be driven through this
opening 9 to initiate ‘removal of the pin ‘I.
the mandrel-bar of the mill by a cap which con
drels of di?erent sizes to accommodate diiierent ,
ventionally provides an integrally projecting
Although a speci?c example of the invention is
disclosed in accordance with the patent statutes, 5
- 5 mandrel-pin. When mandrels of diiferent sizes
'are used, it is necessary to change these caps to
provide a mandrel-pin ‘of the proper size. This
it is not intended that the scope of the invention -
be limited to this example, excepting to the extent
changing is very diiiieuit, particularly in the case
de?ned by the appended claims.
of a piercing-mill, because the cap transmits very
I claim:
The present invention relates to these caps, one
of the objects of the inventor being to remedy the
rounding a tapered hole, and a mandrel-pin hav
mentioned dli?iculty.
ing a tapered end for insertion in said hole and
V
-
said opening will extend partly to either side of
said face, whereby a‘ wedge may be driven through
piercing-mill;
20
Figure 2 is an enlargement from Figure l; and, . said opening to initiate removal of said pin.
2. A tube mill mandrel assembly including a
Figure 3 is a detail.
More speci?cally, the drawing shows a tubu
' socket member for attachment to a mandrel-bar
lar mandrel-bar I adapted to position a piercer
point 2 between the rolls 3 of a tube piercing-mill.
25 The piercer-point is fixed to the mandrel-bar by
a mandrel-bar cap that exempli?es the present
invention.
’
'
‘
.
-
This cap includes a socket member 4 screwe
into the end of the mandrel-bar I and‘having a
30 mandrel engaging face 5. The socket hole 6 of
this 'member is tapered and adapted to receive a‘
similarly tapered end of the mandrel-pin ‘i, this _
pin having an opposite end ?tting the usual hole
8 in the piercer-point 2. This hole 8 ‘is deeper
36 than the projecting end of the pin " so that the "
back of the piercer-point 2 bears against the face
5 of the socket member 4, whereby the pin ‘I is ' >
relieved from the thrust the work exerts against
the point.
40
Y
an opposite end for mounting a mandrel, said pin 15
having a transverse opening positioned so that
when its ?rst named end is inserted in said hole
A speci?c example of this invention is illus
trated by the accompanying drawing in which:
Figure 1 is a longitudinal section through the
mandrel-bar, piercer-point and work of a tube
20
,
l. A tube mill mandrel-bar cap including a 10
socket member for attachment to a mandrel-bar
and providing a mandrel‘- engaging face sur
‘ l0 heavy thrusts to the mandrel-bar and so be
comes jammed.
ll
,
_
Even though the socket member 4 becomes
jammed within the mandrel-bar, the pin 1 can
with a-socket hole surrounded by a mandrel len
gaging face, a mandrel-pin having an end for in
sertion in said hole and an opposite end adapted 25
to project from said hole beyond said face, and a
mandrel having a hole ?tting the projecting end
of said pin and which is deeper than the length
of the latter to permit said mandrel to engage
said face.
30
3. A- tube mill mandrel assembly including a
socket member for attachment to a mandrel~bar
with a socket hole surrounded by a mandrel en
gaging face, a mandrel-pin having an end for in
sertion in said hole and an opposite endadapted- 35
to project from said hole beyond said face, and a
mandrel havingv a hole ?tting the projecting end
of said pin and which is deeper than the length
of the latter to permit said mandrel to engage
said face, said hole in said member and the ?rst 40
named end of said pin being tapered and said pin
having an, opening extending to either side of
said face when the ?rst named end of said ,pin is
piercer-point of another‘size, the pin 1 then be
ing substituted‘ by another having a projecting . inserted in said hole, whereby a wedge may be
driven through said opening to initiate removal 45
45- end of the proper size.
of said'pin.
_
‘
To facilitate removal of the pin ‘I, it is pro
. WILLIAM T. WEHMAN.
vided with a transverse hole 9 that is shaped to
open ‘on either side of the face Ii when the tapered
be removed when it is necessary to change to a
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