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Патент USA US2115816

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May 3, 1938-
' 2,115,816
Filed Dec. 17, 1936
2 Sheets-Sheet 2
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Tic‘ - E.
4/ 23
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Patented May 3, 1938
Herman J. Koerner, Woodhaven, N. Y.
Application December 17, 1936, Serial No. 116,263
3 Claims.‘
This invention relates to butt-hinged struc
tures, useful typically for the hinging of a rear
gate or tailboard to the body member or floor
of a wagon or truck; and the invention includes
the herein described method of manufacture of
the described butt-hinged structure. In addi
tion to use on vehicles the invention may have a
wider use, wherever a gate or flap is to be hinged
to the edge of any relatively large body or sup
10' port, Whether a floor, table, shelf or other sup
The conventional butt hinge comprises comple-V
mentary members, namely, the two metal leaves,
plates or straps, connected by knuckle joints, that
is, by hinge projections on both of the leaf mem
bers entering the notches or spaces between the
projections or knuckles of the other member,
with a pivot pin or so-called pintle extended
through all the knuckles, placed in alinement,
thus completing the hinge. A typical prior art
example of a butt hinge is that shown in ex
pired patent of R. P. Dunham No. 836,102 of
November 20, 1906, wherein a support or wagon
floor has attached to it one hinge member l?,
25 while the swingable gate or ?ap 9 has a similar
hinge member i0, both hinge members being of
U-shape, overlapping as to their knuckles and
notches, and interconnected by a rod or pintle
threaded through the knuckles. While this butt‘
30 hinged structure permits the swinging move
ments of the gate or flap it is not entirely satis
factory, in that there is no complete circular
bearing surface between the pintle and the leaves,
the latter being U-shaped and contacting only
351 about half of the circumference of the pintle,
causing looseness, weakness and wear.
The'g’encral object of the present invention is
to afford an improved butt-hinged structure
7 adaptable to the uses outlined and of superior
401 operation, ruggedness and wearing qualities.
Other and further objects and advantages will
be explained in the hereinafter following descrip
tion of one or more embodiments of the inven
In the accompanying drawings Fig. 1 is a top
plan view of part of a supporting body or vehicle
bottom, with a ?ap or gate hinged thereto in
accordance with the principles of this invention‘.
Fig. 2 is a longitudinal sectional view of the
structure of Fig. l, on a larger scale, taken on
the broken section line 2-—-2 of Fig. 1, and broken
away for condensation.
Fig. 3, on the same scale with Fig. 1, shows a
detached portion of the structure, suitably broken
away to disclose the structure more fully.
Fig. 4 is a longitudinal sectional view taken on
the line 4—4 of Fig. 3; this ?gure, like Figs. 1, 2
and 3, showing the ?ap or tailboard held hori
zontal, in alinement with the Vehicle ?oor, and
(Cl. 296—57)
Fig. 4 shows also in dotted. lines the upswing
and downswung positions of the flap.
Figs. 5, 6 and 7 in top view and on a scale be
tween those of Figs. 1 and 2 show separately
the hinge leaf on the truck ?oor, the hinge pintle,
and'the hinge leaf or straps on the ?ap or tail-g
Figs. 8, 9 and 10 are longitudinal sectional views
of the parts shown in Figs. 5, 6 and 7 respec
Fig. 11, in perspective, shows a modi?ed form
of leaf or strap piece on the swinging ?ap or
Fig. 12 is a top plan view, and Fig. 13 a vertical
sectional view on the line l3-_l3 of Fig. 12, show
ing an apparatus for and illustrating the method
of manufacture of the butt hinge construction
of the other ?gures.
Referring ?rst to Figs. 1 to 4 the support or
wagon ?oor or bottom 20 may be composed of
wood or other suitable material. Upstanding ad
jacent the side edges of the bottom are the
wagon or truck sides 2|. A swinging gate, ?ap
or tailboard 23 may also be composed mainly of
wood and is hinged to- the truck ?oor 20 to swing
from a raised, upright or closed position as seen
in Fig. 4 in dotted lines, to a horizontal loading
or operating position as shown in full lines,.and
preferably therebeyond to a depending or down
swung position, also shown in dotted lines.
For heavy trucking purposes it is desirable to
reenforce the flap or tailboard 23, and it is shown
as covered or armored at its under side by a sheet
metal sheathing 24 indicated as bent up around
the wood interior at all four edges. The upper
rear corner of the tailboard receives great wear
in use and is shown reenforced by an angle iron
25 covering the back edge of the tailboard ?ap
and the margin of its, top face. The angle iron
may be permanently secured by rivets or screws,
aided by the bolts 44 hereinafter to be described.
Coming now to the butt hinge construction,
and referring additionally to Figs. 5 to 10, the
pintle or pivot pin 28 is. shown as a hollow rod
or shaft, and is preferably composed of a pre
formed pipe, as a length of, wrought iron pipe,
sufficient to engage all of the hinge knuckles to
be described.- It may be roughly machined to
suitable roundness and smoothness, as also may
be the contacting surfaces of the surrounding
knuckles, for a fair ?t, no great accuracy being
The requirement is, for a large gate or swinging
tailboard or the like, to afford a hinge structure of
great ruggedness to stand the battering it re
ceives, which is smooth-operating, substantially
free from looseness and wear, relatively inex
pensive to build as compared with a fully ma
chined job, and having the smooth top surface of
the butt type of hinge.
On the vehicle ?oor, the ?rst butt hinge mem
ber includes the steel or sheet metal leaf or plate
looseness and rattling of the ?ap on the hinge
35 fastened down by bolts 3| having ?ush heads
above, with securing nuts 32 below. The hinge
leaf or plate 30 is not bent U-shape as in the prior
patent referred to, but is a ?at plate, and it has
its rear edge integrally united with a knuckle 34,
or a plurality of such knuckles, each providing a
complete annular wall, and therefore an interior
10 bearing surface which is complete and receives the
pintle 28, with suitable lubrication, for easy and
A suitable means, as a chain 5 I, may be used to
hold the flap or tailboard in its horizontal or full
accurate hinge movements, substantially free of
cluding a converging or V-channeled rest or
loose play and without wear. Thus the ?gures
show three such knuckles 34, each constituting a
15 preformed length of wrought steel or iron tubing
or pipe, cut to length and integrally united to the
plate 20, preferably by welding‘ as will be further
described, the weld line 35 being indicated in Fig.
8 and elsewhere. Between the hinge knuckles 34
20 of the leaf 30 are spaces or notches 31, and be
yond the ?nal knuckles, at each end, are open
notches 38; all of such notches adapted to re
A ?xture, jig or apparatus for manufacturing
the hinge members is shown in Figs. 12 and 13. 10
Upon base plates 55 are attached other parts, in
holder 56, welded to the base, for supporting the
preformed knuckles or pipe sections 34. Frame
parts 5'! are upright plates, welded to the base. 15
Top cross pieces 58 and 59 are welded to the up
rights and constitute a table to support the metal
leaf or plate 39 to be welded to the pipe sections.
The cross piece 59 is a heavy bar with threaded
vertical bores at its ends. A swinging holddown 20
for convenience is shown as a‘series of straps or
piece 50 can partly overlie the plate to be welded,
and is apertured. Above the holddown is a
washer Bl. Extending down through the washer
and holddown and the bore of the bar 59 is a
clamping bolt 92 threaded into the bar. A hand 25
piece or crank 63 is at the top of the bolt.
In operation, the preformed tube sections or
metal strips 40, four of them being shown properly
spaced corresponding with the notches 31 and 38
of the ?oor hinge member. Each of the hinge
knuckles 34 are laid in the V-channel 56 and the
plate 34 is laid on the table 58, 59 and drawn for
ward into relation to the knuckles. The contact 30
straps 40 may be of U-shape, having an upper leg
or strip 41 on top- of the flap 23, a lower leg or
strip 42 under the ?ap, and a U-bend 43 connect
ing edge of the plate may be beveled for optimum
contact with the cylindrical exterior of the
knuckles as shown.
ing them, this U-bend constituting the knuckle,
tudinally adjusted and. spaced according to their
ceive the knuckles of the other hinge member.
On the swingable ?ap or tailboard the hinge
25 leaf, carrying knuckles, may consist of a continu
ous plate, like the leaf 30 already described, but
35 engaging one of the notches 3'I'or 38 of the com
plementary hinge part. The hinge straps 49 are
strongly attached to the flap or tailboard by bolts
44, flush above and with attaching nuts 45 below.
Preferably, as shown, the wood body of the ?ap
40 contains shallow recesses or depressions within
which the straps 40 are accommodated, so that
the entire top surface of the ?ap is ?ush and
The diameters of the pintle 28 and of the pipe
45 or tube sections or knuckles 34 and 43 may be so
The knuckles must be longi
desired position, for which spacers may be inserted
between them. The straps 40 or 48 may be used
as spacers thus ensuring proper ?nal ?t.
When correct relation of plate and knuckles is
attained the handle 63 is turned to clamp forcibly
the plate upon the knuckles. The surfaces hav 40
ing been cleaned are ready for welding. Any
welding method may be used, as electric line weld
ing. Preferably torch welding is used, an intense
?ame softening the contiguous parts, and surplus
ferrous metal being presented, melted and applied 46
selected, as shown, that the metal hinge parts
to reinforce the joint and produce strengthening
have a thickness about the same as that of the
?llets as shown.
truck ?ap, simplifying the structure, but the in
vention is not con?ned to this relation of dimen
50 sions. As an example, the pintle may be about
1%; inches in outside diameter and somewhat
smaller inside, which the knuckles are slightly
over 11/; inches in inside diameter and about 1%
outside. The plate or leaf 30 may be 1% of
55 inches
an inch thick and the truck floor 1% inches thick.
The tailboard may be 1%; inches thick, with the
1%,- inch strap part 4| countersunk therein above
and part 42 outstanding below.
The hinge parts are assembled by alining the
60 knuckles and threading the pintle through them.
The pintle may be con?ned endwise by closures 46
at the ends, see Figs. 1 and 7, for example a welded
disk closing the right end, Fig. 1, and a similar disk
or detachable closure at the other end, preventing
line position of Fig. 4, and conventional means
also will be understood for the purpose of holding
and locking the tailboard in its raised or closed
In lieu of the U-shape straps 40 described, a
different structure may be used as shown in Fig.
11, wherein each strap 48 is integral with or
to a short preformed pipe length or
knuckle 49, thus obviating the need of an under
neath strap leg 42 as in the ?rst described struc
ture. Or, the welded strap may be used inverted,
with lower leg only. In either case a complete
75 circular bearing surface is afforded, preventing
Straps as in Fig. 11 may be simi
larly welded.
I claim:
1. In a butt-hinged structure in combination 60
with a support or ?oor, and a swingable tailboard,
a butt-hinge connecting the support and tailboard,
and comprising hinge members attached to the
support and tailboard respectively, said members
having attaching leaves and interengaging
knuckles and notches, with a pintle engaged in
the alined knuckles; and characterized in that
the knuckles of at least one of the hinge members
consist of preformed sections of cylindrical metal
tubing of closed annular cross section, the same 60
integrallywelded to the hinge leaves.
2. In a structure as in claim 1, a single leaf in
the form of a plate attached to the support or
floor, to which plate are welded, in spaced ar
rangement to afford notches, and in accurate 65
alinement, the several preformed tubular knuckle
sections, forming complete alined bearings for the
interior pintle.
3. In a structure as in claim 1, with preformed
leaf and knuckles welded tangentially together, a
reinforcement consisting of surplus metal united
to the leaf and each knuckle in the interior corner
between them.
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