U.S. patent number 3,900,111 [Application Number 05/448,735] was granted by the patent office on 1975-08-19 for storage rack.
This patent grant is currently assigned to Penco Products Inc.. Invention is credited to Roy R. Hiler, Robert W. Hohl.
United States Patent |
3,900,111 |
Hiler , et al. |
August 19, 1975 |
Storage rack
Abstract
In a storage rack, the beam has a recess in its front in which
there is an opening whose bottom has two low places in it with a
higher place in between, and the opening has a finger-like
extension away from the end of the beam. A key strip has a neck
which can rest securely, substantially without danger of accidental
dislodgment, in either one of the two low places, a tab extending
from the neck in a direction away from the end of the beam and
located parallel to and in front of the recessed part of the beam's
front, and a tapered end extending toward the end of the beam from
the neck. When the neck is in the lower place nearer the beam's
end, the tapered end passes through an opening in a recess in the
beam's end and through an opening in the post and locks beam and
post from coming apart, and the tab leaves the finger-like end of
the front opening quite well open and visible. When the neck is
moved to the lower place further from the beam's end, the tapered
end is short of the post and its opening, the beam and post are
free to be taken apart, and the tab largely covers the finger-like
extension of the front opening.
Inventors: |
Hiler; Roy R. (Sewell, NJ),
Hohl; Robert W. (Doylestown, PA) |
Assignee: |
Penco Products Inc. (Oaks,
PA)
|
Family
ID: |
23781476 |
Appl.
No.: |
05/448,735 |
Filed: |
March 6, 1974 |
Current U.S.
Class: |
211/192;
403/319 |
Current CPC
Class: |
A47B
57/402 (20130101); Y10T 403/587 (20150115) |
Current International
Class: |
A47B
57/40 (20060101); A47B 57/00 (20060101); A47F
005/10 (); F16B 017/00 () |
Field of
Search: |
;211/148,176,177,182,183
;292/145-147,183 ;403/316,319 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Frazier; Roy D.
Assistant Examiner: Staab; Lawrence J.
Attorney, Agent or Firm: Jackson, Jackson & Chovanes
Claims
Having thus described our invention what we claim and desire to
secure by Letters Patent is:
1. A storage rack comprising (a) a post having a side face, (b) a
beam in the front of the rack which beam is supported by the post,
said beam having a front face in which there is an opening in the
portion thereof toward the post, which opening has ends at
different distances from the post and has a lower edge including
two separate lower portions at different distances from the post,
which lower portions form sharp angles with the vertical edges of
an intermediate higher portion separating them, and said opening
extending a substantial amount away from the post beyond the
further away of the two lower portions to form an extended end
portion having a bottom edge located above the lower edge of the
two separate lower portions, (c) the beam including a portion
adjacent to the side face of the post, and the adjacent portions of
the beam and the side face of the post each having an aperture
therein, and (d) a beam lock key including a portion extending in
front of the beam, a portion extending through the opening in the
front of the beam and a portion further back than the opening and
extending from that opening at least into the aperture in the beam,
the portion in front of the beam extending substantially further
away from the post than the portion of the key which passes through
the opening in the front of the beam, (e) the key having one
position in which the portion of the key passing through the
opening in the front of the beam rests in the one of the two lower
portions of the lower edge of the opening which is further from the
post, the portion of the key in front of the beam is in front of
and substantially hides said extended end portion of the opening
and the portion of the key further back than the opening stops
short of the aperture in the post, and does not lack the beam
against substantial upward movement relative to the post which
would create a danger of displacement of the beam or its load, and
the key having another position in which the portion of the key
that extends through the opening in the front of the beam rests in
the other of the two lower portions of its lower edge, the portion
of the key in front of the beam stops substantially short of said
extended end portion, and leaves said extended end portion well
visible, and the portion of the key further back than the opening
extends through the apertures in the post and the beam and locks
the beam against substantial upward movement relative to the post
which would create a danger of displacement of the beam or its
load, the key being in the form of an elongated strip of material
having throughout its length a thickness dimension which is less
than the distance between the intermediate higher portion of the
lower edge and the upper edge of the opening, and having a
longitudinally intermediate portion which has a width dimension
less than the distance between the upper edge and the lower
portions of the lower edge of the opening and having portions
respectively positioned longitudinally in each direction from said
longitudinally intermediate portion which each have a width
dimension greater than the distance between the upper edge and the
lower portions of the lower edge of the opening.
2. A storage rack of claim 1 in which the key is in the form of a
strip having its greater cross sectional dimension in the upright
direction.
3. A storage rack of claim 1, in which the beam is supported by the
post by means of structure from the beam extending into the front
of the post and requiring upward movement for removal from the
position in which the support is effected.
4. A rack setup comprising (a) two upright posts spaced from each
other and having upright walls approximately facing one another,
which walls are hereinafter called the side walls, and upright
walls approximately facing in a direction from which access will be
normally had to the rack setup and which direction they are facing
is hereinafter called the front, (b) at least one approximately
horizontal beam extending between the posts, with posts and beam
having cooperating means to support the beam from the posts, the
beam having a face toward the front and the vertically intermediate
part of that front beam face being recessed so as to be
substantially behind the top and bottom of that front face, said
recessed portion of that beam front face having walls forming a
hole toward each end of the beam, said hole extending in an
approximately horizontal direction and having a portion in a
direction toward the end of the beam and a portion located in a
direction away from the end of the beam where it is substantially
lower than in an intermediate portion between them, the hole bottom
between these two lower portions and the intermediate higher
portion extending in sharply upstanding direction between the
respective levels, and the hole having a further portion in the
direction away from the beam end relative to all the foregoing
bottom portions whose bottom is again higher after another sharply
upstanding step upward, said beam having upstanding end walls
facing the side walls of the posts, each of which upstanding end
walls of the beam extends inward of the end face in an intermediate
area to form an inward protuberance which includes a hole, (c) the
adjacent side wall of the post in each case having a hole in
approximate registry with the corresponding end wall hole in the
beam, (d) and strip members each extending through a different pair
of beam holes mentioned above, the holes in each pair being in each
case one an end wall hole and the other the beam front wall hole
toward that end, the strip being in each case in the form of a
strip whose approximate longitudinal dimension is through the
respective holes, whose greater cross-sectional dimension is
approximately vertical and whose lesser cross-sectional direction
is approximately horizontal, and which, starting the enumeration
away from the beam end through which it extends, includes a head
planar member located in front of the recessed portion of the beam
and approximately parallel thereto and of a size when in an
appropriate position to substantially cover the further portion of
the hole above mentioned, a neck extending through the hole in the
front face of the beam and having a bottom edge higher than the
bottom edge of the head portion and the connecting planar member of
bottom edge between them being sharply upstanding, an intermediate
planar portion having a bottom edge below that of the neck with
another sharply upstanding edge portion between them, and a locking
end at least the end portion of which is tapered to reduce its
vertical cross-section toward its end, which locking end extends
through the hole in the end face of the beam, (e) each strip having
two positions, a locking and a non-locking one, fixed by the neck's
position being in one or the the other of the bottommost portions
of the hole in the front of the beam, the locking position being
the one where the neck is in the bottommost portion of that hole
which is nearer the end of the beam and the strip in such position
also extending at least into the hole in the side face of the post
and the head end of the strip being toward the beam end of at least
a substantial part of the further portion of the hole in the front
of the beam and leaving at least that part of it uncovered and
readily visible from the front as a hole entirely clear from the
strip, and the non-locking position being one where the neck is in
the bottommost position of the front of the beam which is further
from the end of the beam and the locking end of the strip in such
position being entirely short of the hole in the side face of the
post and the strip in its various portions including especially the
two planar portions, together with the neck, being such as to be in
front of or visible a limited distance behind the hole in the front
of the beam substantially throughout the entire extent of that
hole.
5. A storage rack comprising (a) a plurality of upright posts in
pairs, each post of a pair connected to the other by braces, (b)
horizontal beams extending between corresponding posts in adjacent
pairs and having support members at each end connecting them for
the beam's support to the respective posts, the direction in each
post away the other post of the pair and the direction in each beam
away from the beam between the other posts of two pairs being
designated as the outward direction, each beam having an outward
face recessed inwardly, the recessed portion of the outward face
having two extended holes, one near each end of the beam, these
holes each having a bottom which is relatively low for a stretch
nearest the end of the beam, then enumerating in the direction away
from that end, an upward step and a relatively high portion for a
stretch, a downward step with a relatively low portion thereafter
for a stretch, and then an upward step with a relatively high
portion thereafter for a stretch and each beam having end faces
recessed in a direction toward the opposite end face and having a
vertical slot-type hole in each recess, the posts each having
adjacent the end faces a vertical slot-type hole in a position
approximately corresponding to that in the end face nearby, (c)
strip members each held in the beam in limitedly movable positions
respectively near each beam end, with each strip member having a
sharply constricted neck positioned longitudinally between two
larger portions, with the greater cross-sectional dimension of each
strip member being upright and each strip member having an end
outside the beam in the vicinity of the hole in the recessed face
of the beam, its neck passing through that hole and its other end
extending at least into the hole in the end of the beam, each strip
member having one position in which that other end extends through
that recessed hole in the beam end and at least into the
corresponding hole in the post, the neck rests in the lower portion
of the beam's outside hole which is nearer the beam end and the end
of the strip away from the beam end leaves the end of that hole
away from the beam end uncovered, and another position in which the
end of the strip toward the beam end does not extend into the hole
in the post but clears from the post, the neck of the strip is in
the lower portion of the hole in the recessed outer face of the
beam which is further from the end of the beam and the end of the
strip away from the end of the beam covers the end of that hole
away from the beam, with the rest of the strip in front and in back
and through that hole substantially completely obscuring the view
through that hole, and the strip and end holes in post and beam
having relative dimensions and positions preventing the strip from
carrying out any support function for the beam as far as the beam's
support by the post is concerned.
6. A storage rack comprising (a) a post setup including a side
face, (b) a beam at least partly supported by the post setup, which
beam has an outside face visible from the front, part of which face
is recessed relative to the rest, and an end face adjacent the side
face of the post setup a portion of which end face is recessed in a
direction toward the opposite end face, and (c) a safety lock means
to keep the beam on the post setup and forming no part of the way
by which the beam is at least partly supported by the post setup,
which safety lock means includes (1) an opening in the recessed
part of the outside face near the end of the beam toward the post
setup, which opening has a bottom which when described in a
direction starting from that end starts horizontally at a
relatively low point, then has a step upward to a horizontal higher
portion, then a step downward to a horizontal relatively low
portion, and then a step upward to a horizontal portion higher than
any before, (2) a rectangular opening in the recessed portion of
the end face of the beam, (3) a rectangular opening in the side
face of the post setup which opening is larger than that in the end
face of the beam and registers with it, and (4) a strip-shaped key
extending longitudinally from an end immediately in front of the
recessed part of the visible outside face of the beam through the
opening in that outside face and at least into the opening in the
end face of the beam, the key having its larger cross-sectional
dimension vertical and its smaller cross-sectional dimension
horizontal and including, when described starting at the end away
from the beam end and proceeding in the direction toward it, first
a flat plate parallel to and outside the outside face but at least
mainly included in its recess, which plate is large enough when in
proper position to substantially cover the whole end of the outside
face opening which is above the highest horizontal bottom portion
of that opening, then a neck having a bottom higher than the plate
which neck extends through the outside face opening, then another
plate and finally a portion whose top and bottom edges taper toward
each other near that end of the key, the key having a locking
position in which its neck is resting in the low bottom portion of
the outside face opening which is nearer the beam end face, its
tapered end extends at least into the side face opening of the post
setup, and the key's plate at the other end leaves at least an
extended portion of that other end of the outer face opening
visible, and the key having an unlocked position in which the neck
of the key is resting in the other low bottom portion of the
outside face opening, its tapered end terminates short of the side
face opening of the post setup, and its plate at the other end
substantially covers and obscures the part of the end of the outer
face opening which is above that opening's highest bottom edge.
Description
SUMMARY OF THE INVENTION
This invention relates to rack-type structures for the purpose of
storage and the like.
A purpose of the invention is to have such a structure which is
especially safe.
A further purpose is to secure this by a structure which is
comparatively simple and inexpensive, yet effective.
A further purpose is to minimize any chance of failure to get this
as a result of failure to take the simple action required to put
the safety measure into effect.
Further purposes will be evident from the remainder of the
specification and the claims.
BRIEF DESCRIPTION OF DRAWINGS
The drawings all show one particular embodiment of our invention,
chosen from the standpoints of convenience in illustration,
effectiveness in operation, and clear demonstration of the
principles involved.
FIG. 1 shows a complete rack setup of this embodiment of the
invention in front elevation, having in this particular case for
simplicity of illustration merely beams at three levels extending
between two post setups, and having the beam lock setups all in
locked position.
FIG. 2 is a side elevation of FIG. 1, taken from the left side of
FIG. 1. All the remaining views are larger in various degrees as
compared to FIGS. 1 and 2.
FIG. 3 is a fragmentary horizontal section through one of the beam
lock setups and associated beam and post toward the left end of
FIG. 1, with the view being in the downward direction from a point
immediately above the locking key.
FIG. 4 is a fragmentary front elevation of the same thing as is
shown in FIG. 3, broken away to show a partial interior section
revealing part of the locking key.
FIG. 5 is a fragmentary section of FIG. 3 along the line 5--5,
looking from the interior of the post-and-beam setup toward the
front.
FIG. 6 is a fragmentary section corresponding to that of FIG. 3,
but with the locking key in unlocked position, whereas in FIG. 3
the key is in the locked position.
FIG. 7 is a fragmentary section of the same thing as shown in FIG.
6, the section looking toward the rear and being mainly from a
point just in front of the post and the beam both in its upper and
lower face and the depressed intermediate face as well, so that the
only thing there sectioned is the neck of the locking key as it
comes out of the slot in the front of the beam. However, this
Figure includes a portion broken away to show part of the locking
key inside the beam and sectioning the beam end and opposed post
face.
FIG. 8 is a fragmentary section of FIG. 6 along the line 8--8,
looking from the interior of the post-and-beam setup toward the
front.
FIG. 9 is a fragmentary interior elevational view taken from more
or less along the line 9--9 of FIG. 3, and could about equally well
be considered such a view taken from more or less along the line
9--9 of FIG. 6, the view from the point in that direction of the
thing seen being the same regardless of which position the locking
key is in.
FIG. 10 is a fragmentary section along the line 10--10 of FIG.
4.
FIG. 11 is a fragmentary perspective view of that particular part
of the lefward front portion of the beam which includes the opening
for the part of the locking key which is away from the beam end,
leaving out from this showing the locking key itself, and showing
only the front of the beam.
FIG. 12 is a perspective view of the locking key, looked at as a
separate element without showing any of the associated beam or
post, and FIGS. 11 and 12 may in the overall sense be considered an
exploded view in their relation to each other.
FIG. 13 is a fragmentary front elevation of a portion of the
leftward front portion of the beam and the locking key associated
with it, and more specifically of the far end of that locking key
away from the end of the beam, together with the associated portion
of the beam.
FURTHER DESCRIPTION
Describing in illustration and not in limitation and referring to
the drawings:
In the specific embodiment shown (see FIG. 1) the storage rack 20,
which may of course be merely a particular given section of a
larger storage rack, is made up of post setups or upright frames
22, one at each end, and a number of beams 24 stretching across
horizontally between these post setups. Normally there will be two
beams, one in front as there visible and one in back (not shown),
at each level, and often of course shelves or other suitable
structure (not shown) on top of the beams. Each beam, or if not
that, then at any rate each of the front beams, will have a safety
lock setup at each end, these being opposite counterparts when
considered in their relationship to the rack section as a whole,
including the beam, and being designated in the Figures as 26 and
28 for the ones shown at the left and right ends respectively.
Each post setup 22, as shown especially for example in FIG. 2, will
preferably consist of forward vertical member or post 30 and rear
vertical member or post 32, having bearing plates 34 and 36 at
their respective feet, and top horizontal tie 38, intermediate
diagonal tie 40 and lower horizontal tie 42 holding together the
two vertical members. As shown especially in FIGS. 3 and 6, the
vertical members are preferably more or less box-like in overall
cross section, with face 44 on the outer side of the rack being
complete though recessed intermediately at 46 throughout the length
of the post over a surface constituting the greater part of the
total extent of the post face, and with suitable slots 47 through
it in this recessed portion. However, on the other hand instead of
a continuous face across the entirety of the inner side of the
post, there can preferably be mere opposite edge flanges 48, with
an extended gap between, so that the post as a whole is more
particularly in the form of a somewhat closed channel. The slots 47
in the front face of the post are at regular intervals in two
vertical rows, one toward each side of the recessed portion, with
the individual slots preferably not exactly vertical, but slanting
toward the center of the face as the slot goes down, the post
corners preferably rounded, and the edge lines 52 of the recessed
portion of the outer face of the post preferably at a gradual
angle. At regular intervals in a vertical row are rectangular
openings 54 through the side faces of the posts.
Beam 24, as shown for example in FIGS. 1, 3 and 5, is likewise
essentially somewhat box-like in cross section, with outer face 60
again substantially complete though recessed intermediately at 62
throughout its length and over a surface constituting a very
substantial part of its total extent, the unrecessed portions 64
and 66 which are respectively at the top and bottom edges each
having shorter extent toward the midpoint of the face in
comparison. It too has certain particular openings in the front
face, as will be gone into. It preferably is of the "step-beam"
type, - that is, with a step downward in its top face toward the
inner edge of that top face to facilitate use of shelves or other
attachments on the top.
In each case the beam is supported at both ends by the respective
post setups, by means of hooks 70, forming part of the ends 72 of
the beams. The necks 73 of the hooks extend through the nearer ones
of the biased slots 47 in the front of vertical members 32 of post
setups 30 and the ends of the hooks curve downward in the
inside.
More specifically as to the beam, its end piece 72 is mainly a
substantially flat piece 78 welded or otherwise suitably affixed to
the end of the beam. However, it has in it recessed portion 80
surrounding an opening 82, and at the outer end has a fastening
portion 84 bent around at 86 to a direction more or less parallel
to the front face 44 of the post, with a series of hooks 70
extending inward from the end of the parallel portion at different
vertical positions in order to fit into different ones of slots 47
and thus support the beam at each end on the respective posts by
means of the beam's hooks in the post's slots, as already
mentioned.
Locking setup 26 consists of beam lock key 90, forming a part of
the beam which is movable in a limited way relative to the rest of
the beam, together with the corresponding parts of the post and the
stationary part of the beam.
More specifically beam lock key 90 is a strip of metal whose
greater cross sectional dimension or width is in the vertical
direction and whose lesser cross sectional direction or thickness
is in the horizontal direction. It at all times extends through
lock key opening 92 in the outer face of the beam near the beam end
and also extends at least into opening 82 in the end piece 72 of
the beam, and thus is held in the beam, there being such a beam
lock key and cooperating portions of the rest of the setup at each
end of the beam.
Describing the beam lock key starting at its end away from the beam
end, first there is flat rectangular outside tab or plate 94, which
is at all times outside of and parallel to the recessed portion of
the beam's outer face. Next is constricted bent neck 96, which
extends slantingly back through lock key opening 92 in the beam's
outer face, flat rectangular plate 98 going slantingly back in
toward the opening in the end plate, and end portion 100, which is
more or less perpendicular to that end plate and starts out
rectangular but reduced in dimension as compared to rectangular
plate 98, and then tapers down toward the end of the key in its
endmost portion 102, which at least extends into, or may go beyond,
opening 82 in beam end piece 72. Its exact relative location
depends on the position of the beam lock key, as will be gone
into.
Beam lock key opening 92 in the outer face of the beam has a
straight horizontal top 110 and straight end 112 down from that at
the end toward the beam end, but a serrated bottom 114. More
specifically, describing the bottom starting with the end toward
the beam end and going away from that end, first it proceeds
horizontally at 116. Then it has a comparatively small step upward
at 118, then proceeds horizontally again at 120, then has a
comparatively small step downward back to its former level at 122,
then proceeds horizontally again at 124, then has a comparatively
large step upward at 126, then proceeds horizontally again at 128
to the far end 130 of the opening, which far end is vertical.
As already indicated, beam lock key 90 extends through the opening
in the front of the beam and at least into the opening in the end
piece of the beam, being thus held in the beam. This can be done by
simply bringing it into place relative to the beam before the end
piece of the beam is attached, by passing a plate of the strip-form
key through the opening when the plate has its greatest
cross-sectional dimension horizontal, and then turning the strip so
that its greatest cross-sectional dimension is vertical and
inserting the tapered end of the strip at least into the opening in
the end piece when the end piece is brought up to be welded or
otherwise attached, the recessed position of that opening in the
end piece making such preinsertion before final positioning
especially convenient. Thus of course the welded assembly of beam
and end piece will have the key in place. Once in, the cooperation
between end portion 100 of key 90 and opening 82 maintains the key
with its greatest cross-sectional dimension in substantially
vertical position, and plates 98 and 94 maintain the key in its
overall general position relative to openings 82 and 92, the
vertical dimensions of those plates being greater than those of the
openings.
When in place, the beam lock key has two end positions, one with
its neck 96 against end wall 112 of opening 92 and its bottom
resting on the one bottom surface 116 of that opening, and the
other with its neck against vertical edge 126 and its bottom
resting on the other bottom surface 124. In operation as a
practical matter, the key will be positioned resting somewhere on
one or other of these bottom surfaces, kept from moving across from
one to another by the nearer upstanding intermediate wall, 118 or
122 respectively, and the sharp angle which it makes with the
bottom surface, so that in substance it will be affirmatively fixed
in that position for as long as desired, free of any possibility of
being swept across to the other above-mentioned position by a
horizontal or indeed almost any other substantial unidirectional
force. This enormously reduces any possbility of accidental
displacement, although of course if it is affirmatively desired to
change its position, it can readily be lifted and then moved across
while held at a higher level.
In one of the above general positions in operation, the one where
the neck 96 is lying somewhere on the bottom surface 124, the neck
will thus be lying in the bottom portion of the lock opening which
is further from the beam end, and the tapered end of the key will
be short of the opening 54 in the post, leaving the beam free to be
assembled to and disassembled from the post, as may be desired in
setting up or taking down the rack, or altering its particular
form. In this position, the tab extends beyond in front of the end
of the finger-like extension of the front opening in the beam and
covers and hides that end and indeed just about all of that
finger-like extension, thus making it evident that the beam lock
key is in the unlocked position.
In the other position of the key, its neck is in the bottom surface
of the opening which is nearer the end of the beam and its tapered
end extends through the opening 82 in the beam end and at least
into opening 54 in the adjacent side face of the post, the overall
construction including the location of the openings being such that
opening 82 is in registry with opening 54 when the beam is in place
on the post. When the beam lock key is in this position with its
tapered end at least into the hole in the post, the beam and post
are locked together, free of any danger of accidental dislodgment
of the beam, as for example by misapplication of the forks of a
fork lift truck. In this position, the end tab on the key in front
of the beam is short of the finger-like extension of the hole,
leaving that hole extension visible in a way to at once make clear
that the key is in locked position.
In either position of the key, the rest of the strip-form key aside
from the tab is in or immediately behind the rest of the opening in
the front of the beam aside from what the tab covers or leaves
uncovered.
Thus there is in the front of the frontmost beam one of two
conditions - either (1) one in which the whole opening appears
pretty well covered by strip in front or in back of it or (2) one
in which the finger-like extension of the opening appears totally
uncovered; and anyone who has to deal with the storage rack has it
called to his attention at once if the beam is not locked in place
when the rack is in place. In other words, it is very visible and
apparent without need of reflection whether the beam is in the
locked or unlocked condition as to each post.
Furthermore, this is done by a tab which, located in the recessed
portion of the beam face as it is, is especially unlikely itself to
be accidentally dislodged, and thus the security of positioning of
the key is promoted. The recessed front portion of the beam is also
a good place for any labels, etc. since they are especially
unlikely to be accidentally scraped off by the forks of a fork lift
truck, for example.
All this as to the locking is very important, since if, for
example, a fork lift truck on an upward lift should accidentally
hit an unlocked beam from below and dislodge that beam, causing it
to part from the post and fall, material in storage which is
resting on the beam or shelf could slide down onto the operator of
the fork lift truck, seriously injuring or killing him.
Rectangular opening 82 in end piece 78 of the beam has its greater
dimension in the vertical direction, as does correspondingly placed
rectangular opening 54 in the adjacent side face of the post, which
is substantially larger than it.
Furthermore, the construction of the beam and post is such that the
openings are positioned so that there never is any problem about
getting the key into opening 54, but that end of the key always
fits loosely, with plenty of play, in opening 54 when extending
into that opening. Thus the movable key never has any part of the
support function for the beam, but that is entirely served by the
hooks that extend into the front of the post. This enables the
designer to take into consideration the absence of support function
in the key in designing the structure relative thereto, with
possible economy as a result.
This condition of free play in the key and avoiding any support
function in it can be insured, for example, by having the
construction such that when the beam and post are joined together,
with necks 73 of hooks 70 resting in slots 47 in the post front,
and openings 54 and 82 substantially in registry with each other
and the beam lock key in locking position, either (1) the key will
not be itself supported by the post but by the beam, as where for
example the end portion of the key is not even in contact with
opening 54 in the post, or (2) at any rate if itself supported by
the post the key does not itself in turn support the rest of the
beam, as would certainly normally at any rate be the case for
example where the key is not even in contact with opening 82 in the
end of the beam, or its contact does not include any contact
between it and the top of that opening nor any friction fit in the
opening sides.
In view of our invention and disclosure, variations and
modifications to meet individual whim or particular need will
doubtless become evident to others skilled in the art, to obtain
all or part of the benefits of our invention without copying the
structure shown, and we therefore claim all such insofar as they
fall within the reasonable spirit and scope of our claims.
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