U.S. patent number 3,890,755 [Application Number 05/363,045] was granted by the patent office on 1975-06-24 for construction set.
This patent grant is currently assigned to Masyc AG. Invention is credited to Dieter Specht.
United States Patent |
3,890,755 |
Specht |
June 24, 1975 |
Construction set
Abstract
A structural element of a construction set has an elongated web
having two transversely spaced longitudinally extending margins, a
first flange extending along one of the margins, a second flange
extending along the other of the margins and a plurality of cutouts
spaced along the element.
Inventors: |
Specht; Dieter (Dhunn,
DT) |
Assignee: |
Masyc AG (Laufen,
CH)
|
Family
ID: |
23428546 |
Appl.
No.: |
05/363,045 |
Filed: |
May 23, 1973 |
Current U.S.
Class: |
52/645; 193/35R;
52/842; 52/838; 403/4; 52/574; 198/780; 403/98 |
Current CPC
Class: |
B65G
21/06 (20130101); Y10T 403/125 (20150115); Y10T
403/32377 (20150115) |
Current International
Class: |
B65G
21/00 (20060101); B65G 21/06 (20060101); F04c
003/08 () |
Field of
Search: |
;52/645,721,729,720,730,732,753C ;211/175,177 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
186,862 |
|
Dec 1963 |
|
SW |
|
631,559 |
|
Nov 1961 |
|
CA |
|
Primary Examiner: Purser; Ernest R.
Assistant Examiner: Friedman; Carl D.
Attorney, Agent or Firm: Striker; Michael S.
Claims
What is claimed as new and desired to be protected by Letters
Patent is set forth in the appended claims:
1. In a construction set, a structural element comprising an
elongaged web having a first and a second transversely spaced
longitudinally extending margins, a first flange extending along
said first margin, a second flange extending along said second
margin, and a plurality of cutouts spaced along said elements and
including a first row of equidistant cutouts arranged parallel to
said first margin adjacent said first flange, and a second row of
equidistant cutouts arranged parallel to said second margin
adjacent said second flange, the cutouts of said first row being
aligned in the transverse direction of said web with the
corresponding cutouts of said second row; and a disc-shaped
connector having an axis of rotational symmetry and provided with
two elongated arcuate holes extending along a circular arc having a
center located within said axis of rotational symmetry and a
diameter corresponding to the distance between said first and
second rows of cutouts, said connector further including means for
accommodation in said cutouts of said structural element.
2. A construction set according to claim 1, wherein said second
flange has a configuration similar to said first flange and smaller
dimensions than the corresponding dimensions of said first
flange.
3. A construction set according to claim 1, wherein said structural
element has a substantially sigma-shaped configuration.
4. A construction set according to claim 1, wherein said means for
accommodation of said connector in said cutouts comprises two pins
and a bore which are arranged with mutual spacing corresponding to
the spacing of associated cutouts of said structural element.
5. A construction set according to claim 1, further comprising a
cylindrical bore having an axis of rotational symmetry coinciding
with said axis of rotational symmetry of said connector.
6. A construction set according to claim 1, comprising a further
structural element having the same configuration as said one
structural element, wherein said means for accommodation of said
connector in said cutouts attach said connector to said one
structural element, and wherein attachment means are inserted into
said arcuate holes of said connector and in two cutouts belonging
to said first and said second rows of cutouts of said further
structural element for attachment of said further structural
element to said connector at an arbitrary angle in respect to said
one structural element within an angular range determined by the
shape of said arcuate holes.
Description
BACKGROUND OF THE INVENTION
The invention relates to a construction set, and more particularly
to a set of structural elements to be used for construction of
frames for conveyors, shelves or the like.
There is a need in various industrial establishments for a simple
and inexpensive construction set using interchangeable structural
elements, which can be easily assembled and disassembled and which
is not limited to only one use but which is rather versatile
permitting its use for a variety of purposes, such as support
frames, particularly for belt or roller conveyors or gravity
conveyors, regular or continuous shelving or similar
constructions.
In the following disclosure, the construction set will be described
in connection with its use for conveyors, but is not limited
thereto since the versatility of the structural elements will
become apparent and their use in other embodiments is within the
ordinary skill of the user.
The support frames of the known conveyors generally comprise two
beams arranged on both sides of the conveyor and having profiled
cross-sections. Such beams are rigidly interconnected either by
screw coupling or welding together either directly or utilizing
transverse beams or lugs, and they are usually supported on
associated support beams or undestructures. These two beams support
the shafts of the rollers, and corresponding bores are provided in
the two beams for accommodation and attachment of the roller
shafts. Since these constructions are usually made in order so as
to suit a particular purpose, any modification of such
constructions or diversion of the structural elements thereof to a
different use are extremely difficult, if not impossible to
achieve.
SUMMARY OF THE INVENTION
It is an object of the present invention to avoid the drawbacks of
the prior art.
It is a particular object of the present invention to provide a
construction set whose structural elements are interchangeable,
inexpensive to produce and simple to assemble.
A concomitant object of the invention is to provide a construction
set having a wide field of application and simple adaptability to
various space conditions and diversified utilizations.
A still more particular object of the invention is to provide a
construction set for conveyors or shelvings which consists of a
limited number of types of structural and interconnecting elements
and which permits easy assembly and disassembly of a construction
suited to a particular purpose and/or conversion from one such
construction to a different one.
In pursuance of the above objects and others which will become
apparent hereinafter, one feature of the invention resides in
provision of a substantially sigma-shaped universal structural
element comprising a web and two flanges which are similar in
appearance but different in size. According to the invention, one
of the flanges is larger than the other one and defines a channel
whose inner dimensions correspond to the outer dimensions of the
smaller flange. By this expedient, it is possible to telescopically
insert the above-mentioned structural element into another one
having the same configuration but rotated about its longitudinal
axis by an angle of 180.degree. in relation to the first structural
element, in such a manner that the smaller flanges of the
respective structural elements are accommodated in the channels of
the associated structural elements and the webs of these structural
elements adjoin each other. The structural element according to the
invention is further provided with a plurality of cutouts for
accommodation of screws, pins, shafts or similar connecting or
supporting elements.
In a currently preferred embodiment of the invention, the
structural elements are provided with two rows of cutouts, each row
being arranged parallel to one of the flanges in an immediate
vicinity thereof. For easy assemblage of such structural elements
and for their interchangeability, as well as for increasing the
amount of various uses for these elements, the individual cutouts
are not only arranged in rows with constant spacing between the
centers of such cutouts, but are also aligned in the transverse
direction of the web of such structural element so as to form a
rectangular array of cutouts. This results in a perfect alignment
of all of the cutouts of one row in one structural element with the
other row of cutouts in the other element when these elements are
telescopically inserted into each other as described above, and
also in other advantages which will become apparent later. The main
purpose of such regular arrangement of the cutouts is, however, to
facilitate alignment, assemblage and joining of such structural
elements so as to suit a particular purpose, and to assure
interchangeability of such elements.
While it would be quite sufficient if all the cutouts had the same,
for instance circular shape, it is another feature of the invention
that at least every other of the cutouts of one row is provided
with an enlarged portion, thus resembling the letter T. To
advantage, this enlarged portion is provided in an inclined portion
of the web where the web merges into the flange, so that it serves
for facilitation of insertion of elements to be supported in said
cutouts into the same. This arrangement is particularly suitable
for insertion of such elements as shafts or crossties provided with
grooves to be embedded in such cutouts, since the insertion is then
very simple and these elements are secured in such cutouts without
being free to move in their longitudinal directions. Furthermore,
it is advantageous if at least a part of the cutouts has a
multilateral, such as rectangular or hexagonal, shape so that
shafts, crossties or the like may be inserted thereinto by their
correspondingly shaped ends and thus be supported therein without
being free to rotate.
In addition to the above-described structural elements, the
construction set also comprises a base member which is insertable
into the structural element or the assembly of two such elements as
discussed earlier, and a head member similar to the base member but
additionally comprising lugs between which a flange of an
additional structural element may be inserted so as to be
surrounded by the lugs and the head member and firmly held by the
same. Both the base member and the head members comprise connecting
portions adapted for insertion into the structural elements and
provided with elongated cutouts whose distance corresponds to the
distance between the two rows of cutouts in the structural
elements. When such a member is introduced into such structural
element, at least one of the cutouts of the structural element will
be in alignment with each of the two elongated cutouts of such a
member, so that a connecting means, such as a screw or the like,
can be inserted therein and the structural element and the member
can be firmly attached to one another.
A construction set according to the invention further comprises a
connector having a plate which is preferably disc-shaped and is
provided with two arcuate elongated holes extending along a
circular section whose center coincides with the axis of rotational
symmetry of the disc-shaped plate and whose diameter corresponds to
the distance between the two rows of cutouts of the structural
element. The connector is further provided with means for attaching
the disc-shaped plate to another structural element. When using
such a connector, it is possible to attach the two structural
elements to each other so that their longitudinal axes enclose an
angle with each other, thus contributing to the versatility of
applications of such structural elements.
In a currently preferred embodiment of the invention, the means for
attaching the plate to the other structural element comprise two
pins insertable into the cutouts of one row of cutouts of the other
structural element, and a bore which becomes aligned with a cutout
belonging to the other row of cutouts when the aforementioned pins
are inserted into the cutouts of the one row, so that the connector
can be secured to the other structural element by only one screw.
Two other screws are accommodated in the elongated arcuate cutouts
of the disc-shaped plate and extend through two cutouts of the one
structural element aligned in the transverse direction of the web,
so that the one structural element can be attached to the connector
and thus to the other structural element at an angle in relation
thereto.
According to a further embodiment of the invention, the connector
is provided with a cylindrical bore whose axis coincides with the
axis of rotation of said disc-shaped plate and which serves for
accommodation of either a shaft or a bearing, such as a roller
bearing or the like, supporting such shaft.
A further feature of the present invention is the provision of a
support assembly which is adapted for attachment to the
aforementioned structural element and which serves for support of
shafts of rollers or cylinders which rotate about the same, and
wherein the axes of the shafts enclose an angle with one another in
a plane defined by the longitudinal direction of the structural
element and a line perpendicular to the surface of the web. In this
manner, it is possible to provide a trough-shaped conveyor or
roller support for a belt of a belt conveyor.
A very important feature of the construction set according to the
invention is the cross-sectional shape of the structural members,
which is such that one such structural member can be telescopically
inserted into another one after being rotated by an angle of
180.degree. about its longitudinal axis in relation to the other
structural element. This is a consequence of the particular
configuration of the flanges, where one of the flanges of each
structural element is larger than the other one and defines a
channel whose inner dimensions correspond to the outer dimensions
of the smaller flange of the other structural element. So, after
one of the structural elements has been rotated by an angle of
180.degree. about its longitudinal axis, it can be telescopically
inserted into the other structural element so that the smaller
flange of the one structural element is accommodated in the channel
defined by the larger flange of the other structural element whose
smaller flange is, in turn, accommodated in the channel defined by
the larger flange of the one structural element. The currently
preferred sigma-shaped configuration of the structural elements has
a two-fold advantage. First of all, when the structural elements
are telescopically inserted into one another, the webs of these
structural elements extend parallel to each other leaving virtually
no gap between each other, so that they can be easily joined by
simple joining means such as screws without deformation which might
result if the webs were spaced apart. On the other hand, since the
flanges project beyond the plane of the web outwardly of the
conveyor rollers, the shafts of such rollers passing through the
cutouts in the web and secured to the webs by nuts or other
suitable fastening means do not project beyond the plane defined by
the flanges, so that the danger of a passer-by catching his cloth
thereon or suffering an injury is substantially reduced if not
eliminated.
Even though the sigma-shaped configuration of the structural
elements is currently preferred, the invention is by no means
limited thereto. However, this advantageous configuration may
easily be modified within the skill of an artisan without departing
in any way from the basic idea of the invention and sacrificing its
advantages. So, for instance, it is quite conceivable that the
structural elements may have a substantially C-shaped configuration
with flanges having such shapes that one of the flanges of one
element may be telescopically inserted into an associated flange of
another element after one of the structural elements has been
rotated by an angle of 180.degree.. Such a combination of two
structural elements already satisfies some, even though not all, of
the requirements set for such combinations in accordance with the
invention. Therefore, such mofidication of the structural elements
is intended to be understood as falling into the scope of the
present invention.
The novel features which are considered as characteristic for the
invention are set forth in particular in the appended claims. The
invention itself, however, such as to its construction and its
method of operation, together with additional objects and
advantages thereof, will be best understood from the following
description of specific embodiments when read in connection with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a structural element according to the
invention;
FIG. 2 is a cross-sectional view of the structural element along
the line II--II of FIG. 1;
FIG. 3 is a perspective and partially exploded view of a conveyor
utilizing structural elements of the construction set according to
the invention;
FIG. 3a is a side view of a different embodiment of a broken-away
end portion of the shaft to be used in a conveyor according to FIG.
3;
FIG. 4 is a perspective view of a trough-shaped conveyor utilizing
structural elements of the construction set according to the
invention;
FIG. 5 is a cross-sectional view along the line V--V of FIG. 4;
FIG. 6 is a rear view of a connector of the construction set
according to the invention;
FIG. 7 is a front view of the connector shown in FIG. 5;
FIG. 8 is a cross-sectional view along the line VIII--VIII of FIG.
7;
FIG. 9 is a cross-sectional view along the line IX--IX of FIG.
7;
FIG. 10 is a perspective view of the combination of two structural
elements according to the invention utilizing the connector as
shown in FIG. 7 for joining such structural elements so as to
enclose an arbitrary angle to each other; and
FIG. 11 shows another embodiment of the structural element
according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention will be first explained with reference to FIGS. 1 and
2 of the drawing showing one structural element 15 of the
construction set. FIG. 2 shows in detail the advantageous
configuration of such structural element having a shape resembling
the Greek letter sigma and having an elongated web 16 and two
flanges 17 and 18 extending along the entire length of the web
16.
The structural element of girder 15 may be made of metallic, but
also synthetic plastic, material. The flanges 17 and 18 have
similar configurations but different dimensions for reasons which
will be explained later. The flange 17 comprises an inclined
portion 20 which is integral with the web 16 and which merges into
a portion 21 which is parallel with the web 16. This portion 21 in
turn merges into a portion 22 which is perpendicular to the web 16
and which has a lip 23 extending parallel to the web 16. Since the
flanges 17 and 18 are similar to each other, the same numerals have
been applied to the flange 18 with primes added.
The portions 20, 21, 22 and 23 of the flange 17 define among
themselves a channel whose inner dmensions substantially correspond
to the outer dimensions of the portions 20', 21', 22', and 23' of
the flange 18. FIG. 2 further shows an additional structural
element or girder 15' having the same configuration as the girder
15; for the sake of clarity, this girder 15' is shown in broken
line. It can be seen that the position of this girder 15' is
reversed in respect to the girder 15, i.e. the girder 15' has been
rotated by an angle of 180.degree. about its longitudinal axis in
respect to the girder 15. In such a position, the girder 15' can be
easily telescopically inserted into the girder 15 so that the
flange 17' of the additional girder 15' surrounds the flange 18 of
the girder 15 and the flange 18' of the additional girder 15' is
accomodated in the flange 17 of the girder 15. When the girders 15
and 15' are so telescopically inserted into each other, the web 16
of the girder 15 is adjacent, and contacts, the web 16' of the
girder 15'. Thus the girders 15 and 15' are secured to each other
if no forces acting in the longitudinal direction of the girders
are present.
FIG. 1 shows that the girder 15 is provided with a row 24 of
cutouts 26 and 29 extending along the flange 17, and with a further
row 25 of cutouts 30 and 31. In the shown embodiment, the cutouts
26 and 29, as well as cutouts 30 and 31, alternate, the center
distance of these cutouts being the same; that is, for instance,
that the distance between the center of one cutout 26 and the
center of an adjacent cutout 29 is the same as between the center
of this cutout 29 and the center of the next successive cutout 26,
etc. The cutouts 26 are substantially T-shaped, each having an
enlarged portion 27 and a narrow portion 28. While the narrow
portion 28 is located in the web 16 of the girder 15, the enlarged
portion 27 is situated in the inclined portion 20 of the flange 17.
The other cutouts 29 as shown in the preferred embodiment are round
holes.
The other row 25 of cutouts comprises two alternating types of
cutouts 30 and 31, the cutouts 30 being round, and the cutouts 31
hexagonal holes. The cutouts 26 are aligned with the cutouts 30,
and the cutouts 29 are aligned with the cutouts 31, in the
transverse direction of the web 16 so as to form a regular
orthogonal grid for reasons which will become apparent
hereafter.
A number of such girders 15 can be utilized for constructing a
framework for a roller conveyor, as will be explained in the
following with reference to FIG. 3, showing broken-away portions of
two such girders, which are mutually spaced so as to define the
conveyor. These girders may be supported on any arbitrary
understructure, but preferably on a support 35 as illustrated. It
will be understood that the lateral girders 15 of the conveyor can
be combined with other such girders 15 (not shown) so as to
construct a conveyor of any desired length. The particular method
of connection of the successive girders 15 to each other is a
matter of obvious choice, but these girders can be preferably
interconnected by sections of girders -- which are not shown but
which have the same configuration bar the length as the girders 15
-- whose longitudinal dimensions are chosen so as to assure
interconnection of the girders without interfering with the
function of the conveyor.
The support 35 comprises two girders 15 telescopically inserted
into each other, a base member 36 comprising a base plate 40 and a
connecting portion 38 so configurated as to be insertable into the
channels defined by the smaller flanges 18 of the girders 15 and
provided with two elongated holes 39, and a head member 37
comprising a head plate 41 having two lugs 42 and 43 and a
connecting portion 38' insertable into the above-mentioned channels
of the flanges 18 of the girders 15 and provided with two elongated
holes 39'. The lug 42 is provided with a hole 44 which is so
situated that it can be aligned with one of the cutouts 30 or 31 of
the row 25. When such a support is to be erected, the girders are
inserted into one another and fastened to each other by
conventional fasteners, such as screws, in such a manner that their
combined length is somewhat smaller than the intended height of the
support 35. Then the head member 37 and the base member 36 are
inserted into the channels provided in the girders 15, and the
height of the support 35 is adjusted to the desired value by
passing screws or similar fasteners through the elongated holes 39
and 39' of the head member 37 and the base member 36 and the
associated cutouts 26 and 30 or 29 and 31 of the girders 15 and
fastening the head and base members to the girders in any position
limited by the length of the elongated holes. Subsequently thereto,
the support 35 is erected and a lateral girder 15 is inserted
between the lugs 42 and 43 so that the hole 44 in the lug 42
becomes aligned with a cutout of the row 25 and any suitable
fastening means, preferably screws, are inserted through these
holes and fastened so as to provide for a rigid attachment of the
lateral girder 15 to the head member 37 and thus the support 35. It
is evident from the above that the spacing of the elongated holes
39 or 39' must substantially correspond to the spacing of the two
rows 24 and 25 of cutouts in the girders 15. It goes without saying
that, while only one support has been shown, at least one support
will be associated with each lateral girder and all of them will
have a construction similar to the described embodiment.
FIG. 3 further shows a roller shaft 48 which is accommodated in two
cutouts 26, each being associated with one lateral girder 15. It is
to be understood that the conveyor comprises a plurality of such
shafts 48, but only one has been shown for illustrative purposes.
In the shown embodiment, the shaft 48 has two tapered ends and is
secured to the girders 15 by a nut 50 at each of the ends. The
shaft 48 supports rollers 49 for rotation about its axis.
The flanges 17, i.e. the upper flanges in the illustrated
embodiment, serve as lateral limitations of the conveyor, and as
guide means for the articles to be conveyed. This is valid whether
or not the rollers are driven; however, if a chain or belt drive is
used for driving the rollers, which in such a case would be shaped
as cylinders extending substantially the entire width of the
conveyor, a further advantage is achieved, namely that the driving
chain of driving belt may be accommodated in the channels defined
by the flanges 17 and 18 of the individual girders 15, so that the
danger of injury resulting from contact with the moving driving
chain or belt is virtually eliminated. The same is of course valid
if the chains or the belts served for deceleration of the
rollers.
FIG. 3a shows another embodiment of the end portion of the shaft
48' wich permits a particularly simple and fast assembling of a
conveyor. Instead of being tapered as the shaft 48, the shaft 48'
is provided with a slot 51. The shaft 48' which is provided with
such slots 51 at both ends is then inserted into the associated
cutouts 26 of the lateral girders 15 so that the shaft 48' is first
inserted into the enlarged portion 27 and then pushed into the
narrow portion 28 so that the walls of the slot 51 externally
surround the web 16 of the girder 15. Thus, the shaft is secured
both against rotation about, and displacement in the direction of,
its longitudinal axis.
A further embodiment of the invention is shown in FIGS. 4 and 5.
Here, short girder sections 15" are arranged between two of the
girders 15 and connected to the latter via tie-rods 54. The girders
15 have openings 26 through which the tie-rods 54 extend; nuts 55
are threaded onto the outer ends of the tie-rods to hold the same
in place. The webs 16 of the girder sections 15" serve as a mount
for a support assembly 58 which, although being shown as of
three-part construction, could also be of onepart construction.
FIG. 4 shows that the assembly 58 has two outer parts or arms 60
which are mounted via respective mounting plates 59 on the web 16
of the associated girder section 15"; the upper end of each arm 60
is formed with a slot 61. A further part or center support 63 is
mounted on the web 16 intermediate the arms 60; it has the form of
an inverted V and is provided with apertures which each accommodate
one end of the shaft of a cylindrical roller 62, whereas the other
end of the same shaft is accommodated in a respective one of the
slots 61. Evidently, with this construction it is possible to
either erect a through-shaped roller conveyor, or, if desired, to
use the rollers 62 as supports for a conveyor belt.
FIGS. 6-9 show a component, namely the cross-piece 70, which
substantially increases the versatility of the construction set
according to the present invention. The cross-piece 70 has a disc
portion 71 of approximately frustoconical cross-section, the rear
side of which is provided with two pegs whose spacing corresponds
to that of the cutouts 26. The pegs have undercuts 73 adapted to
the configuration of the slots 51 (FIG. 3a), thus permitting the
pins to be retained in two adjacent cutouts 26 of a girder 15. A
tapped bore 74 of the disc-portion 71 registers with the cutout 31
when a connection is established in this manner, so that a screw
may be threaded through the cutout 31 into the tapped bore, thereby
permitting reliable securing of the cross-piece 70 to the web 16 of
a girder 15.
The cross-piece is further provided with two arcuate openings 75
located on an imaginary circle and bounded at the rear side of the
disc portion 71 by an annular projection 76, as shown in FIG. 9. A
recess 77 is formed centrally intermediate the openings 75 and
adapted to accommodate -- as shown in broken lines in FIG. 8 -- the
bearing 78 of a shaft, or any other appropriate component. This
makes it possible to mount shafts, axles or the like between two
girders 15 each of which is provided with one of the cross-pieces
70.
FIG. 10 illustrates a further, and particularly advantageous, use
of the cross-piece 70. It will be seen that the cross-piece can be
employed to mount two girders 15, 15'" at desired angles relative
to one another. To do so, the cross-piece is secured to one of the
girders, here the girder 15, in the manner described above. The
other girder, here the girder 15'", is connected to the cross-piece
by passing screws or bolts through it and through the openings 75.
The girders can evidently be placed at any desired angle relative
to one another, within the limits imposed by the circumferential
length of the openings 75.
It is clear that modifications of the examples provided herein are
possible and will readily suggest themselves to those skilled in
the art. However, even the limited examples which have been
described will already indicate the great versatility of the novel
construction set. In particular, it is possible with this set to
erect any kind of supporting framework, especially for conveyors,
shelving, racks or the like. Moreover, once erected, such a
construction can be readily modified.
It is to be noted that the ends of the shafts 44 and the nuts
threaded onto them (see FIG. 3), the ends of the shafts 48' (see
FIG. 3A), the ends of the rods 54 with the nuts 55 (see FIG. 4) and
the bolts or screws 79 (see FIG. 10) are all recessed within the
width of the flanges 17,18. This is an important safety factor,
because it prevents clothing or body portions of personnel from
becoming snagged on these components. The wider portions 27 of the
cutouts 26 are located in the inclined portions 20 of the girders
15; this facilitates the insertion of an axle 48, rod 54 or the
like into the narrower portion 28 via the wider portion 27. Yet,
the provision of these wider portions does not result in any
significant weakening of the strength of the girders 15 which is,
of course, also an important consideration.
The embodiment of FIG. 11, finally, differs from the preceding
embodiments in that the girder illustrated in that Figure has
portions 21" and 23" which are wider than in the other embodiments.
Cutouts, such as the ones designated with reference numeral 29 in
the preceding embodiments, are in this instance provided only in
the web 16" and in the portions 23". The purpose of this
construction is to provide a girder of improved appearance while,
nevertheless, retaining substantially all of the advantages
inherent in the girders according to the preceding embodiments.
It will be understood that each of the elements described above, or
two or more together may also find a useful application in other
types of constructions differing from the types described
above.
While the invention has been illustrated and described as embodied
in a construction set, it is not intended to be limited to the
details shown, since various modifications and structural changes
may be made without departing in any way from the spirit of the
present invention.
Without further analysis, the foregoing will so fully reveal the
gist of the present invention that others can by applying current
knowledge readily adapt it for various applications without
omitting features that, from the standpoint of prior art fairly
constitute essential characteristics of the generic or specific
aspects of this invention and, threfore, such adaptations should
and are intended to be comprehended within the meaning and range of
equivalence of the following claims.
* * * * *