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Патент USA US3021895

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Feb. 20, 1962
1. D. ROHN
3,021,885
APPARATUS FOR ASSEMBLING CROSS?BRACES ON A MULTI-LEG TOWER
Filed July 26, 1955
4 Sheets-Sheet 1
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Feb. 20, 1962
1. D. ROHN
3,021,885
APPARATUS FOR ASSEMBLING CROSS-BRACES ON A MULTI-LEG TOWER
Filed July 26, 1955
4 Sheets-Sheet 2
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Feb. 20, 1962
'1. D. ROHN
3,021,885
APPARATUS FOR ASSEMBLING CROSS-BRACES ON A MULTI-LEG TOWER
Filed July 26, 1955
4 Sheets-Sheet 3
�13
�
Feb. 20, 1962
1. D. ROHN
3,021,385
APPARATUS FOR ASSEMBLING CROSS-BRACES ON A MULTI -LEG TOWER
Filed July 26, 1955
4 Sheets-Sheet 4
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Faltented Feb. 20, 1962
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3,021,885
.
-
erated by a motor 11 connected to a V-?belt drive 12 for
�
driving an eccentric 13. Connected to the eccentric 13?
are twove'rtical moving rams Hand 15 (FIG. 1) which
are joined at their lower vertical ends by means of a
pivotal connection (FIG. 1) to a hold-down member 16.
APPARATUS FGR ASSEMBLE?IG CROSS-BRACES
Ivan Dwight
H _ ON
Rohn',?
A MULTI-LEG
116 LimestoneBellevue,
TOWER Peoria;
.
, Ill.
Filed any 26, 1955, Ser. No. 524,345
9 Claims. (�. 153-1)
The hold-down member is ?movable vertically relative to
the press 10 and is guided? in its; vertical movement by
means of a dovetail? connection Illa (FIG. 11) between
cross-braces on a multi-leg tower or the like; _
the hold-down member 176 and press 10'. Ailixed on the
At the present time there is a huge? demand for various 10 vertically underside of the hold>down member is? are
types of towers and more particularly light weight towers
suitably eight? spaced vertically movable plungers 17.
This invention? relates to an apparatus for assembling
for use by televion and radio owners" in areas where
? Joined to the? press 10? just below the plungers 17 are
good reception requires an elevated? aerial. Due to? the"
fact that different areas require? different heights for the
a plurality of sets or pairs of spaced generally horizontaly
extending ?xedly mounted arms or members 13 and 19
tower, in order to attain good reception and? for reasons?
of ease of assembly, it is contemplated that the tower be
(FIG. 7)? which? ?are? all identical: in construction. The
arms'ls?an'd 19," are bridged between and ?xedly connected
Composed of a plurality of reinforced light weight sections.
to the frame 1'0 and? vertically extending space/d anchor
It is therefore an object of the present invention? to
provide a novel apparatus for forming and? assembling?
cross-braces on a multi-leg sectioned tower capable of
supports 20' and 21'. The supports 26? and 21 and the
frame 10 are engaged with? opposite ends of the pairs of
meeting the demands of the public for a? stu'r'dv light weight:
stationary position.?
tower.
?
arms 18 ?and 19 and serve to? maintain the arms in a
_
?
_
Pivots 22 are provided? between each of the pairs of
the arms 18' and 19 and lever arm or member 23 enabling
the lever arm to be rocked on the pivots 22 when one end
Another object of this? invention is to? provide? a? never?
apparatus for forming and assembling cross-braces on a
multi~leg tower which permits large scale production? 5 of the? lever arm is engaged and actuated by the plunger
techniques to be utilized at the lowest possible cost.
another object of the present invention is to? pro
vide novel apparatus to facilitate the formation of and
assembling of cross-braces on? a multi-leg sectioned tower.
Other objects, features and advantages? of the present M 0
invention will be more readily apparent from the follow
ing detailed description of the drawings illustrating a
single embodiment thereof, in which:
_
FIGURE 1 is? a front eievational view of the apparatus
utilized in the assembly of the cross-braces? on they tower;
_ FIGURE 2 is a fragmentary cross sectional view taken
on the line Iii-II of FIGURE 1 showing the straps or
blanks in place and one upright laying? across same to be
clenched thereto;
FlGURE 3 is a side elevational view showing in? full
and dotted lines how the cross-?brace is attached to the reg
or upright;
FZGURE 4 is a fragmentary side elevational view simi
lar to FIGURE 3 showing a subsequent step' in my in
venuon;
_
FIGURE 5 is an enlarged? fragmentary sectional view
through FIGURE 3 showing in greater detail how the
strap blank is attached to the upright;
FIGURE 6 is an enlarged fragmentary sectional view
similm to FIGURE 5 only showing? a? subsequent step of
my mvention;
FIGURE 7 is a fragmentary front view showing the
formed tower with apparatus thereon to facilitate the
welding operation;
17 or actuator. Each of the arms 23 is provided with a
die a U-shaped die or a clinching die structure or a strap
and? rod supporting� and strap clenching die area which is
indicated generallyv at 24 and is disposed generally on
the outer side of the arm 23.
It' will be best seen? in FIGURES 1 and 3 that aplu
rality of spaced'pivotally mounted arms 23 are illustrated
which together with? the other apparatus de?ne eight sepa~
rate stations, each of which? is capable of receiving a cross
brace blank 25 (FIGS; 12 and 13) which is to be formed
in' the die 24 in- the assembly of same upon the tower
indicated generally at 26 in FIGURE 10. The tower is
preferably of a tripodal construction having spaced tubu
lar legs 27. More than three legs 27 may be used, if
desired, but a tripodal type tower is the least expensive
to manufacture.
The cross brace blanks 25 are each of a reinforced
more or less M-shaped transverse cross section (FIG.
13) having at spaced intervals of thetblank along the
45 length ?at portions 28 (FIGS. 5? and 12) which are to be
deformed to engage? nestingly about the rods 27 ashore
inafter will become more apparent. The number of these
?at portions 2S?depend of course upon the number of legs?
27 in? the tower 26; If a tower having three legs is to be
manufactured then two ?at portions 28' are employed to
engage two of the legs 27 and the ends 25:: and 25b of
the blanks 25 are engaged with and secured to the third
leg 27 as shall become more evident hereinafter.
I
Each? of'the dies 24 (FIGS. 5 and? 6)? on the lever arms
FIGURE 8 is an? enlarged fragmentary view of the 55 23 includes a recess 2? having a vertically slidable spring
clamp and end jig shown in FIGURE 7;
tensioned anvil 30 Iadjustably mounted therein. ' The lower
FIGURE 9 is
enlarged cross sectional view taken
e?rid?of the re'cess'29 leads into a slot 31 which is adapted
substantially on the line IX?IX of FIGURE 8 looking in
to
receive a bolt 32 having? a spring 33 thereavround? in
the direction indicated? by the arrows;
v
the recess; The bolt 31 is attached to a nut atone end
FIGURE 10 is an enlarged fragmentary perspective
with the other end bearing against the anvil for adjusting
view showing a portion of the completed tower;
the level of the anvil with the top surface of the arm
FIGURE ll is an enlarged fragmentary cross sectional
23 whereby the brace or strap blank 25 may be main~
view taken on the line XI~XI of FIGURE 3 looking in
tained in engagement-against the tubing 27 during the
the direction or" the arrows;
-
I
FIGURE 12 is an enlarged elevational view of a? strut
or brace blank; and
7
FIGURE 13 is an enlarged cross sectional view taken
substantially on the line XIII-XIII of FIGURE 12 look
ing in the direction indicated by the arrows.
As shown on the drawings?:
The
reference
.
numeral
.,
to
H?.
clenching operation;
_
? Mounted on the arm 23 on opposite sides of the recess
29? are protuberances 35' and 36 which serve to aid in
centering a flat portion 28 vof ?the brace or strut relative
to the die (FIGS. 5 and 6). By so doing; the uprights
may be equidistantly spaced from one another since the
?atiportio'ns' 28' on" the blanks 25 are evenly spaced.
(FIG.
__'.V _
3)>1nd1cates
'
,
.. i-
gen.
erally an anchored press or break machine which is? up
The amuse-haras- arcuate' indentation or a die bot
tom-{$7 which is? a" component ofv the die 24;" and aids in
3,021,885
3
4
Again the plungers 17 are activated and the end portions
the forming and assembly of the brace blanks 25 on the
rods 27. In addition, spaced corners or strap forming or
bending edges 33 and 3? at the vertically upper end of the
recess 29 de?ne edges along with the vertical side walls
for further aiding in the formation and assembly of the
braces on the rods (FIGS. 5 and 6). The stationary arms
25a and 2512 are deformed so as to nest about the rod.
In order to insure more reinforced connections between
the rods and the formed cross braces 43, each of the
formed braces 43 where engaged with the rods 27 may
be welded to the rods. To aid in this operation jigs 44
and 45 (FIG. 8) are utilized. Jig 44 (FIG. 8) comprises
19 have notched ends or areas or channeled rod gripping
areas 40 closely approximating the cross sectional con
a main tripodal base 46 provided with three tubular ex
tensions 47 each having a female terminal 43. Since the
in the formation of the tower section the arms 18 and 10 rods 27 have male terminals 49 with reduced diameters
to facilitate in the vertical stacking of same, they may be
19 function as one leg of a scissor structure with the
readily inserted into the female terminals 48 and main
lever arms 23 being movable relative to the stationary
tained in aligned position by means of a pin 58 through
arms 18 and 19 by the operation of the actuator structure
the male and female terminals.
which includes the press 10 as well as the hold down
Jig 45 comprises a bar 51 having spaced clip like
member 16 and the plunger 17. The actuator structure 15
?guration of the rods 27.
clamps 52 at intervals thereon. These spaced clamps 52
provides means on the apparatus to cause relative move
are each engaged over the free ends 25a and 25b to hold
ment between the scissor ?rst and second legs to clench
same in tight engagement with the rod 27 (FIGURES
the straps to the rod or upright. When the second leg
of the scissor structure is actuated the upright is forced
7-9).
The ?nal step in my novel method is to weld or other
against the one leg of the scissor structure the straps are 20
wise secure each of the points of contact between the
caused to be bent and deformed about the upright by
rods 27 and the nested portions of the cross braces 43.
means of the dies 24 which are spaced along the second
Any suitable welding equipment may be used to weld the
leg of the scissor structure.
assembled tower braces and legs while they are held in
Method of operation
25 the jigs 44 and 45 above described. Thereafter these jigs
The ?rst step in the operation of my novel apparatus
is to insert the cross-brace blanks 25, in this case eight of
them, although any suitable number may be employed,
upon the horizontally spaced receiving stations of the
machine. The ?at or corner portion 24 of each blank 30
is centered with relation to the protuberances 35 and 36
at each station so that the portion 24 is vertically aligned
with the die recess 29 (FIG. 3).
Thereafter a rod is transversely positioned across all
eight of the support strap blanks 25 and in each instance
is rested upon a ?at portion 29 of each blank. It will be
noted that a centering jig 41 (FIGS. 1 and 2) is secured
to? the press and carried at one end of the row of stations
by one of the arms 18 so as to center the rod 27 relative
are removed from the completed tower section.
It will be understood that variations and modi?cations
may be e?ected without departing from the novel con
cepts of the present invention.
I claim as my invention:
1. In an apparatus to form and attach a plurality of
longitudinally'spaced connecting straps to spaced uprights
to form a tower section, strap receiving stations each
having a pivotal connection joining it with the apparatus,
the strap receiving stations being adapted to support con
necting straps and an upright disposed on the connecting
straps in transverse relation, each of said strap receiving
stations having a die capable of receiving a portion of a
connecting strap and a portion of an upright, a ?xed arm
mounted in a ?xed position on said apparatus adjacent
to the supported blanks 25. The jig 41 has three stops
said die for engaging said uprights, the dies being pivot
42 against which each of the tubular ends of the rods 27
ally movable in an arc towards and away from said ?xed
are adapted to bear against in the progressive assembly
arms, means on said apparatus engaged against said strap
of the three legs 27 and the strap blanks thereby insuring
receiving stations to rotate the dies in an arc towards said
proper alignment of the ends of the legs.
?xed arms with said ?xed arms being engageable against
At this point the anvil 30 may be adjusted to keep the 45 an upright and cooperating with said dies to deform a
brace blank 25 ?rmly tensioned against the tubing 27
strap portion of each of the straps by causing the upright
during the clenching operation (FIG. 6).
and the strap portions to be worked in the dies and to
The next step is to start the machine with the plungers
cause the strap portions to be contemporaneously clenched
17 urging one end of each of the lever arms 23 downward
in assembly with the upright, each of said dies having a
and thereby urging the other end of the arm having the 50 vertically movable die bottom for engagement with a con~
die 24 vertically upward to forcibly press the leg 27
necting strap and spaced strap bending edges with said
against the notched area 46} of the stationary arm 19.
die bottom disposed between them, and means connected
As a consequence of the leg or rod 27 striking the arms
to the die bottom for controlling the position of said die
18 and 19, the force of the impact causes the ?at por
bottom with respect to said spaced strap bending edges
tion 28 to be nested or clenched more than half way 55 when said straps and rods are being loaded on said
around the rod to ?rmly grip and clench same (FIG. 6).
stations.
It will be appreciated the preferred manner of operation
2. In an apparatus to form and attach a plurality of
is one where the clenching action occurs simultaneously
longitudinally spaced connecting straps to spaced uprights
at all of the stations.
to form a tower section, strap receiving stations each
The operator of the machine then picks up the rod 27 60 having a pivotal connection joining it with the apparatus,
the strap receiving stations being adapted to support con
indexes the assembly (FIG. 4) by sliding same rearwardly
necting straps and an upright disposed on the connecting
toward the press so that the next set of ?at portions 28
straps in transverse relation, each of said strap receiving
of the strap blanks are aligned with the dies 24. A sec
stations having a die capable of receiving a portion of a
65
ond rod or upright is transversely aligned by means of
connecting strap and a portion of an upright, a ?xed arm
jig 4-1 and disposed over the dies 24 so that it rests on
?mounted in a ?xed position on said apparatus adjacent
the flat portions of the straps 25. The plungers 17 are
said die for engaging said uprights, the dies being pivot
again activated to clench the second rod to the brace
ally movable in an arc towards and away from said ?xed
blanks 25 in the same manner as previously.
?
70 arms, means on said apparatus engaged against said strap
and attached brace blanks 25 and manually rotates or
The operator then indexes or rotates the assembly
receiving stations to rotate? the dies in an arc towards
again. The free ends 25a and 2512 (FIG. 9) of each of
said ?xed arms with said ?xed arms being engageable
the braces 25 are then aligned end to end and the third
against an upright and cooperating with said dies to de
form a strap portion of each of the straps by causing the
upright and the strap portions to be worked in the dies
rod is properly positioned with respect to the other'rods
already clenched to the braces by means of the jig 41.
3,021,885
5
and to cause the strap portions to be contemporaneously
clenched in assembly with the upright, each of said dies
having a vertically movable die bottom for engagement
with a connecting strap and spaced strap bending edges
with said die bottom disposed between them, and means
connected to the die bottom and cooperable with said
?xed arms to- insure that the strap portions being de
formed are maintained in abutment with the upright
6
upright by means of said dies, said press being positioned
rearwardly of said dies and connected with rearward ends
or" said rocking arms leaving an area above the dies open
for free movement of collapsed strap portions therein.
8. In an apparatus to form and attach a plurality of
longitudinally spaced transverse connecting straps to
spaced uprights to form a tower section, a press having ver
during the clenching operation.
tically movable rams, spaced pivotally mounted members
on said rocking arm at each station, the press being con~
adapted for engagement with the upright, said vertically
mounted on the apparatus and disposed in front of said
3. In a tower section forming apparatus for attaching 10 vertically movable rams and being capable of receiving the
a plurality of longitudinally spaced connecting straps to
straps thereon at spaced intervals and capable of support
spaced uprights, a press, a series of strap receiving stations
ing an upright transverse of the straps, a die on a forward
each comprising a pair of spaced ?xed arms and a rocking
end of each of said members, said dies being located for
arm mounted between and pivoted on said ?xed arms be
wardly of said vertically movable rams, a ?xed arm dis
tween its opposite ends, and a strap bending die disposed
posed adjacent each of said dies, said ?xed arms being
nected to the rocking arms for contemporaneously causing
movable rams being engageable with rear ends of said
pivotally mounted members to move said dies towards said
straps to be wrapped around the upright by means of
?xed arms to forcibly urge an upright and straps towards
said dies.
20 one another with the ?xed arms being engageable against
4. In a tower section forming apparatus for attaching a
the upright to bend intermediate portions of straps in the
plurality of longitudinally spaced connecting straps to
dies and to form intermediate strap portions about an up
spaced uprights, a press, a series of strap receiving stations
right in clenched engagement therewith.
each comprising a pair of spaced ?xed arms and a rock
9. In a tower section forming apparatus for attaching a
ing arm mounted between and pivoted on said ?xed arms 25 plurality of longitudinally spaced connecting straps to
said rocking arms at each station to rock to cause the
between its opposite ends, and a strap bending die dis
spaced uprights, a series of longitudinally spaced strap re
posed on said rocking arm at each station, the press being
ceiving stations each having a die, said strap receiving
connected to the rocking arms for contemporaneously
stations comprising means for collapsing and upsetting
causing said rocking arms at each station to rock to cause
longitudinally spaced portions of the connecting straps
the straps to be wrapped around the upright by means of 30 about an upright, a press disposed at a rear side of said
said dies, said press including a series of vertically mov~
dies leaving a forward area located forwardly of said dies
able rams each engaged with a rearward end of one of said
free for an operator, and leaving an area about the dies
rocking arms for rocking said rocking arm on its pivot.
free of the press for free movement of collapsed portions
5. In a tower section forming apparatus for attaching
of each strap therein, said means including relatively mov
a plurality of longitudinally spaced connecting straps to 35 able arms positioned alongside one another at each station
spaced uprights, a press, a series or" strap receiving sta
and which arms are pivoted with respect to one another
tions each comprising a pair of spaced ?xed arms and a
and have vertically spaced portions for engagement with
rocking arm mounted between and pivoted on said ?xed
an underneath side of each strap and a top side of the up
arms between its opposite ends, and a strap bending die
right and with all of the said arms being disposed between
disposed on said rocking arm at each station, the press 40 said press and said station, at least one of said arms at each ,
being connected to the rocking arms for contemporane
station being connected with the press at a rearward loca
ously causing said rocking arms at each station to rock
tion disposed rearwardly of said dies and actuatable on its
to cause the straps to be wrapped around the upright by
pivot by the press at said rearward location for simultane
means of said dies, each of said dies having a vertically
ously causing spaced straps to be upset around an upright
movable die bottom for engagement with a connecting 45 by means of said dies.
strap and spaced strap bending edges with said die bot
tom disposed between them, and means connected to the
die bottom and cooperable with said ?xed arms to insure
that the strap portions being deformed are maintained in
abutment with the upright during the clenching operation. 50
6. In a tower section forming apparatus for attaching
a plurality of longitudinally spaced connecting straps to
spaced uprights, a press, a series of strap receiving stations
each comprising a pair of spaced ?xed arms and a rocking
arm pivoted on said apparatus at each of said stations 55
and disposed between said ?xed arms, and a strap bending
die disposed on said rocking arm at each station, the press
being connected to the rocking arms for contemporane
ously causing said rocking arms at each station to rock to
cause the straps to be wrapped around the upright by 60
References Cited in the ?le of this patent
UNITED STATES PATENTS
209,747
309,801
760,167
788,969
841,326
969,859
1,675,188
1,692,033
Belt ________________ __ Nov. 12,
Rayner ______________ __ Dec. 23,
Warner ______________ __ May 17,
Walker ______________ .. May 2,
Knutsen ______________ __ Jan. 15,
Haskell _____________ __ Sept. 13,
Macomber ___________ _. June 26,
Gray ________________ __ Nov. 20,
1878
1884
1904
1905
1907
1910
1928
1928
1,720,133
1,776,124
1,911,624
1,954,545
1929
1930
1933
1934
7. In a tower section forming apparatus for attaching
1,981,189
Le Roy ______________ __ July 9,
Krutt _______________ __ Sept. 16,
Kuklenski ____________ __ May 30,
Uline _______________ __ Apr. 10,
Peterson _____________ __ Nov. 20,
a plurality of longitudinally spaced connecting straps to
1,981,221
Chesley _____ __' ______ __ Nov. 20, 1934
spaced uprights, a press, a series of strap receiving stations
1,994,428
2,253,639
2,281,299
2,376,604
2,399,053
2,596,375
2,601,029
2,846,760
Keil _________________ __ Mar. 12, 1935
means of said dies.
1
each comprising a ?xed arm and a rocking arm mounted 65
alongside of said ?xed arm and pivoted between its op
posite ends on the apparatus at each of said stations, and
a strap bending die disposed on said rocking arm at each
station, the press being connected to the rocking arms for
contemporaneously causing said rocking arm at each sta 70
tion to rock to cause the straps to be wrapped around the
1934
McMahan ___________ __ Aug. 26, 1941
Steenstrup ____________ __ Apr. 28, 1942
Lathrop _____________ __ May 22, 1945
McLaren ____________ __ Apr. 23,
Daniels ______________ __ May 13,
King ________________ __ June 17,
Rohn ________________ __ Aug. 12,
1946
1952
1952
1958
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