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Патент USA US3022561

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Feb. 27, 1962
E. MARBURG
3,022,551
APPARATUS FOR HANDLING SECTIONAL HOT TOPS
Filed March 1, 1960
4 Sheets-Sheet 1
INVENTOR
EDGAR MARBURG ‘
A‘Ilorn ey
Feb. 27, 1962
E. MARBURG
3,022,551
APPARATUS FOR HANDLING SECTIONAL HOT TOPS
Filed March 1, 1960
4 Sheets-Sheet 2
E4.
250 46
A
‘of?
l N VEN TOR
EDGAR MARBURG
By
Feb. 27, 1962
E. MARBURG
3,022,551
APPARATUS FOR HANDLING SECTIONAL HOT TOPS
Filed March 1, 1960
4 Sheets-Sheet 4
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506.4 I? MARBURG‘
Attorney
United States Patent 0 "ice ,7
3,522,551
Patented Feb. 2'27, 1562
1
2
3,022,551
opposed vertically slotted openings 8 are provided in the
tube 2 adjacent the lower end thereof. Similarly posi
tioned vertically slotted openings 1% of less length than
APPARATUS FOR HANDLING SECTIUNAL
HOT TOPS
'
Edgar Marburg, Pittsburgh, Pa., assignor to United
States Steei Corporation, a corporation of New Jersey
Filed Mar. 1, 196i), Ser. No. 12,22
13 Claims. (CI. 22-31)
openings 8 are provided in the tube 4. Diametrically op
posed vertically slotted openings 12, similar to openings
8, are provided in tube 2 above the openings 8 and are
spaced 90° from openings 3. Vertically slotted openings
14, similar to openings 10, are provided in tube a above
openings 10 but at 90° therefrom. Hot top supports 3.6
tional hot tops and more particularly for setting in ingot 10 are associated with each of the lower sets of openings and
hot top supports 18 are associated with each of the upper
molds sectional hot tops as shown in my co-pending ap
This invention relates to an apparatus for handling sec
plications Serial No. 847,599, ?led October 20, 1959, and
sets of openings.
Since all of t e hot top supports are
constructed in the same manner, only one will be de
Serial No. 849,337, ?led October 28, 1959. Sectional hot
scribed in detail. Each of the supports includes a bracket
tops are difficult to insert in ingot molds since the slabs
making up the hot tops are heavy and difficult to handle. 15 20 welded to‘ the outer tube 2 and which is preferably
Normally a crew of three or more men is necessary to
manually set the hot top into the ingot mold. The crew
made of two plates, one on each side of the associated
openings 8 or 12. A two-armed member 22 is pivotally
must work on top of the ingot mold where they are ex
posed. to very hazardous conditions. To minimize the
mounted on the bracket 253 by means of a pin 24.
hazards, expensive safety devices such as platforms, lad
8 and lit or 12 and 14, and has a beveled edge 28 for a
purpose which will appear later. The other arm 36 ex
ders or hanging steps are used. Thus a great deal of labor
and time is required to set the hot top.
It is therefore an object of my invention to provide
One
arm 26 extends inwardly through the associated openings
tends outwardly from tube 2 and has a stop 32 welded
to its upper surface. A rubber pad 34 is attached to the
upper surface of arm 39 and extends outwardly from the
apparatus for mechanically inserting a sectional hot top
25 stop 32. An abutment 36 is welded to the inside of tube
into a mold.
4 just above each slot 10. A similar abutment 38 is weld
Another object is to provide such apparatus which
ed to the inside of tube 4 just above each slot 14. A
enables a hot top to be set in place or removed quickly
pair of opposed holders 4% are mounted on the tube 2
and safely with little danger of breakage.
above the supports 18 in the same vertical plane as sup
These and other objects will be more apparent after
referring to the following speci?cation and attached draw 30 ports 16. Each of the holders 4% consists of an inverted
U-shaped member 42 welded to a bar 44 having a washer
ings, in which:
46 welded to its inner end. The lower end of the outer
FIGURE 1 is an elevation showing the apparatus of my
leg of the U-shaped member 42 is ?ared outward for a pur
invention installing a sectional hot top within a mold;
pose to be described later. The bars 44 and washers 46
FIGURE 2 is a view ‘taken on the line II—-II of
35 are mounted in a tube 48 extending diametrically of tube 2.
FIGURE 1;
,
A spring 50 surrounds the rod 44. with one end bearing
FIGURE 3 is a view, similar to FIGURE 2, but show
against washer 46 and the other end bearing against a
ing the hot top supports in retracted position;
FIGURE 4 is a view taken on the line IV—IV of
slidable washer 52. The holders 441“ are assembled and the
assembly secured to the tube 2 in diametrically opposed
FIGURE 1;
FIGURE 5 is a view taken on the line V—V of 40 vertical slots 54 extending from the top of tube 2 down
FIGURE v1;
to the location of the holders 46. A second pair of hold
_
FIGURE 6 is a view taken on the line VT-VI of
ers 56 are mounted in the tube 2 at a higher elevation
than holders 4% and directly above the supports 18. Each
of the holders 56 includes a bar 58 bent downwardly at
FIGURE 7 is an elevation of the top part of the ap
45 its outer end and a bar 6% extending downwardly from and
paratus taken at right angles to FIGURE 6;
FIGURE ‘5;
FIGURE 8 is an enlarged sectional view of a de
welded thereto inwardly of the end thereof so as to form
an inverted U-shaped member. Spaced washers 62 and
tail;
FIGURE 9 is a view, similar to FIGURE 1, showing
63 are welded to each of the bars 65 within a tube 54
located in the tube 2. Diametrically opposed vertically
a second embodiment of my invention;
FIGURE 10 is a view taken on the line X--X of 50 slotted openings 65 are provided inthe tube 2 for re
ceiving the bars 58. A cover plate 68 is secured to the
FIGURE 9;
top of tube 2, preferably by means of hexheaded bolts or
FIGURE 11 is a view, similar to FIGURE 10, but
machine screws, not shown. A bail '79 extends down
showing the hot top supports in retracted position;
wardly through a slot 71 provided in plate 68 and is
FIGURE 12 is a view taken on the line XII-XII of
55 welded to the top of inner tube 4. A plate 72 is bolted
FIGURE 9;
to the top of plate 68 over the slot 71 so as to provide
FIGURE 13 is a view taken on the line XIII-XIII of
FIGUREv 10;
FIGURE 14 is a view taken on the line )GV—XIV of
FIGURE 10;
FIGURE 15 is an enlarged sectional view of a de
tail;
60 otal movement thereof.
In assembling a hot top of the type disclosed in my
'
FIGURE 16 is an enlarged sectional view of another
detail;
openings for receiving the bail 79. A bail 73 is bolted
to the top of tube 2 for pivotal movement. A stud 74
attached to and extending through bail ‘73 limits the piv
co-pending application Serial No. 847,599, the installing
device or mast is placed on the ground resting on base
'
FIGURE 17 is an enlarged view taken on the line
platen as shown in FIGURE 2.
In this position the
65 outer tube 2 moves downwardly until its lower end rests
on plate 6. This causes the supports It; and
to move
FIGURE 18 is a fragmentary plan view of the top of
XVlI-JCVII of FIGURE 14; and
r
'
to their outward or expanded position ‘where they are
ready to receive the slabs of the hot top. The bevel 28
of each arm 26 abuts the associated abutments .25 and
having a second tube 4 mounted therein for axial move 70 38 to hold its outer arm 30 horizontal. The side slabs
S are ?rst placed on the upper supports 13 with their
ment. A plate 6 is welded to the bottom of tube 4 and
the apparatus.
Referring more particularly to FIGURES 1 to 8 of
the drawings, the reference numeral 2 indicates a tube
extends outwardly beyond the tube 2.
Diametrically
tops being restrained from falling outwardly or inwardly
by the holders 56. The end slabs E are then placed on
the lower supports 16 with the ends of the side pieces
fitted into grooves on the face of the end piece. The
vertical portion of the outer leg of the inverted U-shaped
112, respectively. Since the construction of the supports
114 and 116 are alike, only one will be described in
detail. The supports consist of a tread 118 having a
rubber pad 120 secured to the top thereof'and an in
’ member 42 is inside the plane of the outer face ‘of ‘the
wardly extending square ‘arm 122 secured thereto. The
side piece, but the lower end of the ?ared portion is
outside it. The inverted U-shaped member is pressed
downwardly outwardly with the spring 50 being com
pressed and the inverted U ?tting ‘over the top of the
arm 122 has a circular axial opening 124 therein and has
end slab.
studebolts 126 threaded into horizontal openings on
either side of the arm 122. The arms 122 are located
" between the corresponding plates ‘96 and 5:6 and the studs
The end slabs E and side slabs S rest on the 10 126 are received in the corresponding slots 182 and 166.
rubber pads 34 and bear against the respective side stops
32. 'With the side slabs S 6 inches higher ‘than the end
slabs E, the overall length is reduced by about % inch
and the side slabs are inside the sides of the end slabs
The total height of parts 118 and 128 is slightly less than
the height of slots 11% or 112 and the outer periphery
thereof is arcuate and has a radius the same as that of the
tube 80. The thickness of parts 118 and 120 is about
so as to permit insertion of the hot top into mold M. 15 ‘the same as the combined thickness of the walls of tubes
80 and 82. A round bar 127 having a length slightly
The mast is then lifted by means of a crane hook placed
under bail 73 and is carried to the mold and the assembly
less than the inside diameter of tube 80 is provided in
is lowered into the mold as shown in FIGURE 1. As
the openings ‘124 to provide lateral’ support. The tube
88 has diametrically "opposed vertical slots 128 therein
the assembly is lowered the end slabs E will be supported
by the mold top, but the mast continues its-downward 20 directly above slots 118. Holders 138 ‘are received in
movement until the weight of the mast is supported by .
the slots 128. The holders 138 consist of a pair of tu
the’ holders'56 resting on the side slabs S. The weight
of‘ the mast then forces the side slabs downwardly into
'wedging engagement with the end slabs E'so that the
bular members 132 welded to a central U-shaped plate
134, round bars 136 having their inner ends secured to
sleeves 138'and their 'outer ends ‘bent at right angles at
lower portions of the hot top pieces are'forced outward 25 140. A spring 142 surrounds the bar 7136 between sleeve
into close contact with the walls of the mold. The inner
138 and a movable vwasher 144.’ To keep the Ushaped
~134‘vertical, the outer lower edges of'tubes 132
. the
tube outer
41 in the
tubemeantime’
2; thus drops
causing
downwardly
the supports
with’Hand
respect 18' plate
extend into slots 128; so that the tubes cannot rotate.
to rotate about their pivot withthe rubber-mat 34 con
Vertical slots 146 are provided in the top of tube 8411 di
ta'cting the wall of the tube 2 as'shownin FIGURE 3. 30 rectly above openings 112. Holders 148 are provided in
The mast can then be removed upwardly-from the mold’
the slots 146.’ As best shown in FIGURE 16 the holder
assembly 148 includes a tube 158, two round holder bars
and hot top. In some instances the hot top is not used
152 having 'a' Washer 154 secured to the inner end thereof
after it has been placed on the mold, and in that case it
within the tube 150 and a spring 156 surrounding the bar
can be removed by the same mast. This ‘is done by
lowering the mast into the hot top by means of bail 73 35 152 between the washer 154 and a movable washer 157.
The outer end 158 of bar 152 is bent at right angles.
which is then rotated until it ‘is stopped by stud 74, and
A pin 160 is preferably provided through the center of
transferring the crane hook to the bail 78. When the
tube 159 toprevent inward overtravel'of the bars 152.
mast is lifted by bail 78, the supports16 and 18 are
A plate 162 is attached to- the top of tube‘i‘ltl by means of
rotated to their outer position so that they are under
the end and side pieces. The U-shaped member 42 and 40 bolts passing through lugs 164Vwelded to the inside of
the tube. A slot 166 is providedin the plate 162 and
the holder 56 are then placed over the tops of the pieces
a plate 168 is bolted to the'top ofplate 162 over the top
and the hot 'top is removed by raising the assembly
upwardly.
V
of slot 166. Openings 17llinto the tube’ 80 are provided
In the embodlment‘of'my invention shown in PEG
at each end of the plate 168 and a ball 172 passes down
URES 9 to 18 reference numeral 80 indicates a tube 4.5 wardly therethrough'and is welded to the ‘top of tube
.82. A second bail 174 in generally the same vertical
having a second tube 82 mounted therein for axial move
plane as bail 172 is bolted to the outside'of tube 80
ment. Plate 84 having an outside diameter approxi
mately the'same as the outside diameter of tubersil'is
and 'oneof the arms thereof is provided with a stop 176
secured to the bottom of tube 82 by means of machine
to limit its rotational'movement. Short bars or lugs 178
screws (not shown). A pair of diametrically opposed 50 are welded to vthe underside ofthe plate 162 at opposite
edges, the bars ?tting into slots 128, for a purpose to be
vertical slots 86 extend downwardly from the top of’tube
82. Two diametrically opposed studs 88 are ‘attached to
the tube 80 intermediate its ends and extend inwardly
To assemble the mast the outer'tube 80 is placed over
the inner tube 82 with the studs '88 aligned with the slots
‘so as to be received in the slots 86 to prevent relative
86. The inner tube is then lifted by bail172 until the ends
rotation between the tubes 80 and 82 and to limit the
upward movement ofptube 82 in tube 80 when'plate 84
of the slots“ reach the studs 88. With the tube so held
is removed. Two parallel vertical plates 90 extend '
the ‘open ends of the diagonal slots 102 and 106 are in
across the tube 82 and are secured thereto by means of
alignment with the slots 110 and 112 in the tube 88.
The supports 114 and 116 are then inserted throughtheir
spacer bars 92 and 94 which in turn are attached to the
tube 82 by means of screws (not shown). Similar plates 60 associated slots with ,a bar 127 in the axial opening 124
96 are arranged above the plates 90, butare spaced 90°
of one of the tubes 122. The bar 127 is guided into the
around the periphery therefrom. Plates 96 aresecured
tube or arm of'the opposite holder and both are pushed
to the tube 82 through spacer bars '98 and 100 which
inwardly until the studs 126 enter the corresponding, diag
described later.
.
g
V
v
in turn are secured to the tube 82 by means of screws
onal slots 1'82 and 106. The tube 82 is then vlowered '
(not shown). The bar 94 is preferably cut out to re 65 until’ its base isrlevel wlththe bottom of tube 80. The
ceiverthe bar 98 and the lower ends of plates 96. A’
mast is then lifted by the bail 174 which causes the tube
pair of.slots 102 are provided in the plates 99 and extend
82 to drop downwardly and the support'lugs to be re
downwardly and outwardly to diametrically opposed I
tracte’d until they are flush with the tube 80.- The base
slotrs 104 in the tube 82. Similar pairs of slots 106
plate 84 is then attached to 'the'tube 82.
'
(FIGURE '13) are provided in the plates 96 and extend
downwardly and outwardly to diametrically opposed I
slots 188 in the tube 82. The tube 80‘has diametrically
In assembling a hot top of the type disclosed in 'my co
pending application Serial No. 849,337, the installing dew
vice or mast is placed on the ground with the supports 114
and 116 in their extended position as shown in FIGURE
in alignment with the slots 184 and 108, respectively.
10. The side pieces S are first placed on the lower'sup
Supports 114 and 116 are received in'tlie slots 110 and 75 ports 114 with'their tops inside the bent ends of holders
' opposed horizontal slots 110 and 112 therein which are
3,022,551
6
136. The'end pieces E are then placed on the upper hold
ers 116 with their tops held by the bent- ends of holders
148. The pre-assembled hot top is M; inches narrower
than the mold opening in the long direction, and the dis
tance between the outside faces of the side pieces is less
than the width of the end pieces, so that there is ample
above the ?rst pair of supports in a plane above the
second pair of supports and supported by said ?rst tube,
and a second pair of hot top holders arranged above the
second pair of supports in a plane above the ?rst pair of
holders and supported by said ?rst tube, each of said
holders including a downwardly extending portion adapted
to bear against the outer side of a hot top piece.
3. A device according to claim 2 including a bail at
Further lowering wedges the side pieces S between the
tached to said ?rst tube, and a bail attached to said second
end pieces. Finally the weight of the mast is allowed to 10 tube.
4. A device for inserting 4-piece hot tops on a mold
rest on the side pieces. The lugs 178 bearing on bars 152
comprising a ?rst tube, a second tube mounted for axial
insure that the weight of the mast bears entirely on the
movement in the lower end of said ?rst tube, a ?rst pair
side pieces to force them downward to a tight ?t. Relieved of hot top supports pivotally mounted on said ?rst tube
of the weight of the pieces of the hot top the inner tube 82
drops downwardly and the supports 114 and 116 are 15 adjacent the bottom thereof on opposite sides thereof, a
clearance for insertion into the mold.
The mast is
lowered until the end pieces E drop into a wedging ?t.
retracted as seen in FIGURE 11 so that the mast can be
withdrawn through the hot top. Since the weight of the‘
pieces of the hot top may not be suf?cient to keep the lugs
from retracting when the mast is lifted the crane hook is
second pair of hot top supports pivotally mounted on said
?rst tube above the ?rst pair of supports in a vertical plane
between the ?rst pair of supports, said second tube having
slots therein adjacent each of said supports, each of. said
attached to the bail 172 in lifting the assembled hot top for 20 supports including a seat portion of an arm extending
through said slot into said second tube, an abutment on
installation so that the support treads will be automatically
said second tube above each of said slots for engaging said
held extended. After installation of the hot top the crane
arm to move the associated support from its extended posi
hook is removed from the bail 172 (which bail is rotated
tion to its retracted positionupon movement of said ?rst
back until stopped by stop 176) and placed under bail 174
to withdraw the mast. When it is necessary to remove 25 tube downwardly with respect to said second tube and to
limit downward movement of said seat portion, a ?rst
an installed hot top from the mold the reverse practice is
followed. The mast is picked up by the bail 174, lowered
pair of hot top holders arranged above the ?rst pair “of
supports in a plane above the second pair of supports and
into the hot top and the holders 130 and 148 are placed
supported by said ?rst tube, and a second pair of hot top
over the hot top pieces, the crane hook is transferred to
the bail 172 so that the supports 114 and 116 will be 30 holders arranged above the second pair of supports in a
plane above the ?rst pair of holders and supported by
extended outward under the hot top pieces when the mast
said ?rst tube.
is raised. The end pieces will be ?rst lifted 6 inches to
. 5. A device according to claim 4 including a bail at
loosen the ?t after which the side pieces will be picked up
tached to said ?rst tube, and a bail attached to said second
and the hot top withdrawn from the mold.
In practice, two masts are preferably used so that one as tube.
6. A device for inserting 4-piece hot tops on a mold
hot top may be assembled on one mast while another hot
comprising a ?rst tube, a second tube mounted for. axial
top is being installed by the other.
movement in the lower end of said ?rst tube, means on
While two embodiments of my invention have been
said second tube limiting downward movement ofsaid
shown and described, it will be apparent that other adapta
tions and modi?cations may be made Without departing 40 ?rst tube with respect thereto, a ?rst pair of hot top sup
ports pivotally mounted on said ?rst tube adjacent the
from the scope of the following claims.
bottom thereof on opposite sides thereof, a second pair
I claim:
of hot top supports pivotally mounted on said ?rst tube
1. A device for inserting 4-piece hot tops on a mold
above the ?rst pair of supports in a vertical plane be
comprising a ?rst tube, a second tube mounted for axial
movement within the lower end of said ?rst tube, a ?rst 45 tween the ?rst pair of supports, said second tube having
slots therein adjacent each of said supports, each of said
pair of hot top supports arranged adjacent the bottom of
supports including a seat portion and an arm extending
said device on opposite sides thereof and supported by
through said slot into said second tube, an abutment on
one of said tubes, a second pair of hot top supports ar
said second tube above each of said slots for engaging
ranged in a plane above the ?rst pair of supports in a
vertical plane between the ?rst pair of supports and sup 50 said arm to move the associated support from its ex—
tended position to its retracted position upon movement
ported by one of said tubes, means operable by relative
of said ?rst tube downwardly with respect to said second
movement between the ?rst and second tubes to move
tube and to limit downward movement of said seat por
both of said pairs of supports between retracted and
tion, a ?rst pair of hot top holders arranged above the
extended positions, a ?rst pair of hot top holders arranged
a‘eove the ?rst pair of supports in a plane above the second 55 ?rst pair of supports in a plane above the second pair
of supports and supported by said ?rst tube, each of
pair of supports and supported by said ?rst tube, and a
said last named holders having an inverted U-shaped
second pair of hot top holders arranged above the second
member at its outer end for engaging a piece of said hot
pair of supports in a plane above the ?rst pair of holders
top, and a second pair of hot top holders arranged above
and supported by said ?rst tube.
2. A device for inserting 4-piece hot tops on a mold 60 the second pair of supports in a plane above the ?rst
pair of holders and supported by said ?rst tube, each of
comprising a ?rst tube, a second tube mounted for axial
said last named holders having a downwardly extending
movement within the lower end of said ?rst tube, means
member at its outer end.
on said second tube limiting downward movement of said
7. A device according to claim 6 including a bail at
?rst tube with respect thereto, a ?rst pair of hot top sup
ports arranged adjacent the bottom of said device on 65 tached to said ?rst tube, and a bail attached to said
second tube.
opposite sides thereof and supported by one of said tubes,
8. A device for inserting 4-piece hot tops on a mold
a second pair of hot top supports arranged in a plane
comprising a ?rst tube, a second tube mounted for axial
above the ?rst pair of supports in a vertical plane between
movement in the lower end of said ?rst tube, a ?rst pair
the ?rst pair of supports and supported by one of said 70 of hot top supports arranged adjacent the bottom of said
tubes, each of said supports including a seat portion on
device on opposite sides thereof and supported by one
which a hot top piece rests, means operable by relative
of said tubes, a second pair of hot top supports arranged
movement between the ?rst and second tubes to move
in a plane above the ?rst pair of supports in a vertical
both of said pairs of supports between retracted and
plane between the ?rst pair of supports and supported by
extended positions, a ?rst pair of hot top holders arranged 75 one of said tubes, each of said supports including a seat
3,022,551
and a radial arm extending inwardly therefromrsaid ?rst
‘tube having a slot’ therein for ‘receiving s'aidns'eatfsa‘id
second tube having a'sl‘ot therein for 'receiving’s'aid'afm,
means operable by' relative movement between Tthe‘f?'r’st’
and second ‘tubes to move both of ‘said pairsi'of s'u' ‘Hts
between retracted and ‘extended positions,‘ a' ?rs't'fp‘air
of hot top holders arranged "abovethe ?rst pair'ofsu'p
ports in‘ ‘a ‘plane above the second pair of supports ‘and
supported by said ?rst tube, ‘and a second pair, of” Hot
top‘ holders arranged above the second‘pair 'of' supports
in a plane above the ?rst pair of holders and supported
by said ‘?rst tube.
,
'
g
attached to said ?rst tube, and a bail attached to said
second tube.
r
_
, movement in the lower end ‘of saidv ?rst tube, means'o'n
saidvseco'nd ‘tube limiting downward movement of said
?rst tube with 're'spect'lt‘he'ret'o, al?rist pair'of ‘hot top sup
ports arranged adjacentfthe bottom of said device on
opposite sides thereon a second pair ‘or hot top supports
arranged ‘in a plane above the ?rst ‘pair of supports ‘in
a vertical‘v plane between 'the ?rst ‘pair of stipports, each
of said ‘supports including a seat anda' radial arm ex
,
tending inwardly it-he'refrom, "said ?rst'tube having a are:
‘therein for receiving said seat, said second tube having a
slot therein for receiving said arm, appair of parallel
9. A device according to claim 8 including a‘bail at
tached to said‘?rst ‘tube, and a bail attached to said
second tube.
:
>12, ‘A device vfor inserting 4:pi'ece hot tops 'onta mold
comprising a ?rst tube, ‘a, second tube mounted'for axial
a
‘ spaced vertical members supported by said second tube
10. A device for inserting 4-piece‘ hot tops on) arnold
comprising a ?rst tube, a second tube'm'ounted for axial
adjacent each or said supports, said vertical members
movement in the lower end of said ?rst tube, a ?rst v‘pair
having aligned slots therein: extending ‘downwardly and
of hot top supports arranged adjacent the bottom of said
device on opposite sides thereo?la second pair of not top
supports arranged in ‘a plane above the'?r‘st pair of sup
20 means on each arm extendinglinto the aligned slots in the
" ports in a vertical plane between the ?rst pair of ‘sup
outwardly to‘ thelcor'respondingi-slot in 'said'second tube,
' corresponding'ver'tical members, ‘said second tube‘ having
opposed vertical slots in ‘the’ top thereof, means on said
?rst vtube extending into said opposed vertical slots, said
ports, each of said supports'including arseat and a radial
arm extending inwardly therefrom, said ‘?rst tubejhaving
a slot therein for receiving said seat, said'secondjtube'
shaving-a slot therein for receiving“ said arm, 'a 'p'airof
vparallel spaced‘verti‘cal members'suppo'rte'diby said ‘set:-v
0nd tube adjacent each of said supportsysaid, vertical
supports ‘moving from an extended position to. a retracted
25
position when'said ‘second tube moves downwardly with
respect "to v‘said ?rst tube, a ?rst'pai'r of hot top holder-s
afrangediabovethe ?r’sfpair of supports 'in'a' plane above
thesecond pair of supports and supported by said ?rst
tribe, and‘a second‘ pairi'of ‘liot'to'p holders arrangedabove
members having aligned ‘slots ‘therein extending "down;
wardly and outwardly ‘to the ‘corresponding‘slot'in‘said 30 the secondpair of ‘suppo'r'ts‘in a‘aplane above the ?rst pair
of holders and supported by ‘said ?rst tube, each of said
second tube, means on each arm extending into the aligned
holders including a downwardly extending portion adapted
slots in the corresponding vertical member's, said's‘ec'fofn‘d
to bear’ against the outer 'side ‘of a hot top- piece.
tube having opposed vertical slots in the top thereof,
means on said ?rst tube extending into said‘opposed ver
13. A device according to claim 12 including a bail
tical slots, said supports moving'from an éxtehlded'posi V35 attached to said ?rst tube, and a bail attached to' said
‘ tion to a retracted position when said second tubemoves '
downwardly’ with respect v‘to saidr?rst' tube, a‘?r'stl pair ‘of
second tube.
‘
References Cited in the ?leJof this patent
hot ‘top holders arranged above the ?rst pair of supports
in’ a plane above the second pair of supports and sup
'
’
FOREIGN PATENTS V
V
,7
ported by said'?'rst tube, and a second ‘pair of hot top 40' 562,330
Canada __'_' ____ __'_‘_'_r__'_ 'Aug. ‘26, 1958
holders arranged above the second 'pairnof supports in
OTHER REFERENCES 7
a'plan'e above the ?rst pair of holders and supported ‘by
said ?rst tube.
The Iron Age, publication, September ‘12, 1957, page
11. A device according to claim 10 including'a'bail
123 relied‘upon.
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