U.S. patent number 3,584,904 [Application Number 04/806,977] was granted by the patent office on 1971-06-15 for locking connection for supporting grid systems.
This patent grant is currently assigned to Flangeklamp Corporation. Invention is credited to Earl Abbott, Robert P. Lickliter, John F. Reeves.
United States Patent |
3,584,904 |
Lickliter , et al. |
June 15, 1971 |
LOCKING CONNECTION FOR SUPPORTING GRID SYSTEMS
Abstract
A first support member having a web with a slot therein and a
second support member having a web and a locking connector formed
integral therewith and extending therefrom for insertion in the
slot. The connector has a locking tab engageable behind one side of
the first support member web and reversely bent into a recess
defined by a first reinforcement channel formed in the connector. A
projection in the channel prevents complete collapse of the tab
into the recess during insertion through the slot. A second
reinforcement channel disposed above the first channel extends
therebeyond into the second support member web. Stop shoulders on
the locking connector engage the other side of the first support
member web.
Inventors: |
Lickliter; Robert P. (Hamburg,
NY), Abbott; Earl (Hamburg, NY), Reeves; John F.
(Tonawanda, NY) |
Assignee: |
Flangeklamp Corporation
(Buffalo, NY)
|
Family
ID: |
26690696 |
Appl.
No.: |
04/806,977 |
Filed: |
March 13, 1969 |
Current U.S.
Class: |
403/252; 52/667;
52/664; 403/345 |
Current CPC
Class: |
E04B
9/122 (20130101); F16B 7/00 (20130101); Y10T
403/447 (20150115); Y10T 403/70 (20150115); F16B
2200/20 (20180801) |
Current International
Class: |
E04B
9/06 (20060101); E04B 9/12 (20060101); F16B
7/00 (20060101); F16b 021/08 (); E04b 001/38 () |
Field of
Search: |
;52/664,667,669
;287/189.36A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Perham; Alfred C.
Claims
What we claim is:
1. A locking connection for supporting grid systems and the like
comprising a first support member having a web with a slot therein;
a second support member having a web with a locking connector
extending therefrom and formed integral therewith; said locking
connector being insertable through said slot and having a leading
edge; said locking connector including a resiliently yieldable
locking means having a portion engaging one side of said web; said
locking means comprising an extension of said connector and a
continuation of said leading edge reversely bent to extend
rearwardly from said leading edge, said locking connector being
provided with a channel recess terminating adjacent said leading
edge in facing relation to said reversely bent locking means and
having a configuration slightly larger than said locking means
whereby said locking means is adapted to be cammed into said recess
upon insertion through said slot of said first support member.
2. A locking connection according to claim 1, wherein said recess
is provided with means preventing complete collapse of said locking
means in said recess.
3. A locking connection according to claim 1, wherein said locking
connector is provided with reinforcement means extending
substantially parallel to said web of said second support and
extending rearwardly into said web.
4. A locking connection according to claim 1, wherein said locking
connector has a stop shoulder engageable against a side of said web
opposite said one side.
5. A locking connection according to claim 1, wherein said locking
connector has a pair of spaced stop shoulders engageable against a
side of said web opposite said one side.
6. A locking connection according to claim 5, wherein said stop
shoulders are spaced from said web engaging portion of said locking
means a distance substantially equal to the thickness of said first
support member web.
7. A structural support member comprising a web portion and a
flange portion extending laterally from opposite sides of said web
portion; locking connectors extending axially from opposite ends of
said support member; each locking connector comprising resiliently
yieldable locking means having a leading edge and a locking portion
forming a continuation of said leading edge and reversely bent to
extend rearwardly therefrom, said locking connector being provided
with a recess slightly larger than said reversely bent locking
portion and terminating at said leading edge in facing relation to
said reversely bent locking portion whereby the latter is adapted
to be cammed into said recess upon lateral inward deflection of
said locking portion.
8. A structural support member according to claim 7 wherein said
recess is provided with means preventing complete collapse of said
locking portion in said recess.
9. A structural support member according to claim 7, wherein each
locking connector is provided with a pair of spaced stop shoulders
located rearwardly of said locking portion.
10. A structural support member according to claim 7, wherein each
locking connector is provided with a first reinforcement means
having an offset channel extending parallel to said web portion and
a second reinforcement means having a channel parallel to said
first reinforcement means and laterally offset therefrom.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to structural connector elements
and, more particularly, to locking elements used in supporting grid
systems.
While not limited thereto, the present invention is particularly
adapted for use in ceiling tile supporting grid systems of the type
comprising a plurality of parallel spaced main grid members and
cross grid members extending transversely between the main grid
members and having end portions insertable through said main grid
members and interlocking therewith.
One of the critical problems confronted in these supporting grid
systems lies in providing satisfactory locking connections for the
intersecting grid members having the requisite stability and
strength to form a rigid supporting grid construction. Generally
such grid members are formed of an inexpensive, soft sheet metal.
It has been proposed that they be provided with connector portions
having slots, notches or hooks intended to lock the grid members in
position. While these types of locking means have generally served
the purposes for which they were designed, they have not been
entirely satisfactory because they allow some clearance or play
between cooperable attaching parts and do not provide a
sufficiently strong or rigid connection. Sometimes, short,
resilient fingers have been struck out from the body of the
connector forming an opening therein so that the finger can be
cammed into the opening when inserted through a slot of a
transversely extending main grid member. When the finger passes
beyond the slot, its leading edge is intended to snap into locking
engagement behind the web portion of the main grid member. In
addition to employing much effort to insert this type of finger
lock through the slot, the finger is worked to such an extent after
being assembled and disconnected that the finger tends to take a
permanent set toward the opening of the connector body so that its
usefulness is minimized if not destroyed. Moreover, when assembled,
excessive clearance is realized between the leading edge of the
finger and the web portion of the main grid member. Also, the
locking portions of the above known connectors are easily damaged
when subjected to impact or abuse during installation and handling.
In some instances, separable locking connectors fixed to the end
portions of the grid members are used, thereby increasing the
number of parts, complicating the assembly thereof, and increasing
the cost of the system.
SUMMARY OF THE INVENTION
Accordingly, a primary object of the present invention is to
provide a locking connector for supporting grid systems and the
like formed integral with a grid member which slip-fits into
assembled relation, easily and by hand, with a simple, linear
motion and a minimum of effort.
Another object of this invention is to provide the foregoing in a
connection which is economical, strong and rigid in construction,
durable and reliable in use, capable of withstanding abuse during
installation and handling, and which can be produced by relatively
simple manufacturing techniques.
A further object of the present invention is to provide the
foregoing in a locking connection which can be easily assembled
with a snap fit and readily disassembled by hand and can be reused
many times.
Still another object of this invention is to provide the foregoing
locking connection with reinforcement means to form a strong
connection and prevent lateral deflection thereof.
Generally speaking, the connection of the present invention, as
hereinafter described, comprises a first support member having a
slot in its web for receiving a locking connector extending from a
second support member. The connector is provided with reinforcement
means in the form of a rigid channel member having a recess for
receiving a portion of a resilient element adapted for movement
away from the recess when effecting a connection with the first
member. The resilient element has a part adapted to snap into
locking engagement behind one side of the web of the first member.
Means are provided for preventing the resilient element from
completely entering into said recess and facilitating lateral
outward movement of the element when effecting a connection. Stop
shoulders are provided on the connector to engage the other side of
the web of the first member in the assembled relation.
The foregoing and other objects, advantages and characterizing
features of the present invention will become clearly apparent from
the ensuing detailed description of an illustrative embodiment
thereof, taken together with the accompanying drawings wherein like
reference characters denote like parts throughout the various
views.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary, perspective view of intersecting grid
members incorporating the locking connection of this invention;
FIG. 2 is a view similar to FIG. 1, but with the members
disassembled;
FIG. 3 is a side elevational view, on an enlarged scale, of a
supporting grid member incorporating locking connectors of this
invention, being broken away for ease of illustration;
FIG. 4 is an enlarged, fragmentary, horizontal sectional view of
the assembled members taken about on line 4-4 of FIG. 1;
FIG. 5 is a fragmentary, vertical sectional view thereof taken
about on line 5-5 of FIG. 1;
FIG. 6 is a fragmentary, vertical sectional view thereof on a
further enlarged scale, taken about on line 6-6 of FIG. 4; and
FIG. 7 is a view similar to FIG. 6 but with the locking connectors
removed.
DETAILED DESCRIPTION OF THE PREFERRED FORM
Referring now in detail to the illustrative embodiment shown in the
drawings, FIG. 1 shows a ceiling tile supporting grid system
incorporating locking connectors of the present invention and
comprising a main T-support member, generally designated 10,
detachably connected to a pair of cross T-support members,
generally designated 12. The main T-member 10 can be conveniently
fabricated from a single piece of any suitable material, preferably
an inexpensive, lightweight metal such as soft steel for example,
and is formed to provide a generally vertical web portion 14
upstanding from laterally projecting, tile supporting flanges 16 on
opposite sides thereof and surmounted by a generally box-shaped,
longitudinally extending, reinforcing member 18.
Web 14 is provided at spaced intervals with rectangular, normally
vertical slots 20 for reception of the locking connectors on cross
T-members 12, only one such slot being illustrated. Slots 20 are
generally H-shaped, being formed with downwardly and upwardly
projecting tabs 22 and 24, respectively, at the top and bottom of
the slot (FIG. 7) which serve as partitions or separators between
the two cross T-members 12 in the assembled joint.
Cross T-members 12 can be similarly fabricated from a single piece
of any suitable material, such as soft steel by way of example, and
formed to provide a normally vertical web portion 26 and upstanding
from laterally projecting, tile supporting flanges 28 and
surmounted by a generally flat, longitudinally extending,
reinforcing member 30. It should be appreciated that reinforcing
members 18 and 30 can take various shapes in transverse cross
section, such as a flat horizontal strip, a reinforced flat
vertical edge having a thickness approximately twice that of the
web portion, or a curved or rounded bulb shape, as desired.
In accordance with this invention, cross T-members 12 are provided
at their opposite ends 36 with locking connectors, generally
designated 40, extending from said opposite ends of each cross
T-member 12 and formed integral therewith. It should be noted that
connectors 40 at opposite ends of cross T-member 12 are offset and
oriented in opposite lateral directions. As shown in FIG. 3,
connectors 40 each include a tongue, generally designated 42,
laterally offset from web 26 and projecting axially beyond cross
T-member end 36. A significant feature of this invention is the
provision of a mechanical reinforcement for each connector in the
form of a channel 44 having a web body 46 and opposed
longitudinally extending beads 48 and 50 defining a recess 52
therebetween. The leading edges of beads 48 and 50 are rounded, as
shown at 60 and 62, to facilitate insertion of connector 40 into
slot 20 of main T-member web portion 14. Beads 48 and 50 are curved
in transverse cross section so that the opposite sides thereof
engage the sides of slot 20 and tabs 22, 24 to form a tight
connection and prevent rotation or twisting of connector 40 within
slot 20, as shown in FIG. 6.
A tab 54 initially extending axially beyond channel 44 and forming
a continuation of web body 46 terminates in a generally flat edge
56. Tab 54 is bent back toward web body 46 with flat edge 56
adapted to engage behind main T-member web portion 14 for locking
engagement therewith in the assembled relation, as shown in FIG. 4.
Tab 54 is partially disposed within recess 52 of channel 44 and is
slightly inclined outwardly away from recess 52 and rearwardly
toward web portion 26. Tab 54 is resiliently yieldable into recess
52, being held against complete collapse into recess 52 by means of
a projection or stop 58 protruding from web body 56 toward tab 54.
The material of connector 40 including tab 54 is relatively soft
and ductile. However, stop 58 prevents tab 54 from being completely
forced into recess 52 and taking a permanent set therein, thereby
insuring an outwardly sloping disposition of tab 54 when assembled.
Accordingly, tab 54 can be repeatedly installed, disconnected, and
subjected to impact forces during handling and assembly without
being sufficiently damaged to destroy its useful life.
Another important feature of this invention is the provision of a
second channel member or elongated embossment 66 disposed above
channel 44 and oriented generally parallel thereto. Embossment 66
is provided with a web body 68 recessed laterally in the opposite
direction from web body 46 of the adjacent channel 44 and forms an
upward continuation of a portion of bead 50. Embossment 66 has a
forward edge forming a stop shoulder 70 abutting web portion 14 of
main T-member 10 in the assembled relation. A second stop shoulder
71 is provided below channel 44 and has a vertical edge disposed in
a common plane with shoulder 70 to preclude vertical rocking
movement of support member 12 relative to member 10. Embossment 66
extends rearwardly past end 36 and tapers toward web portion 26
into which is finally merges. This embossment 66 not only provides
a mechanical reinforcement for tongue 42 but also prevents lateral
deflection of such tongue in the assembled connecting joint.
When assembling the grid system, connectors 40 are inserted into
slots 20. In the illustrated joint, connectors 40 from the adjacent
ends of aligned cross T-members 12 extend side by side through web
portion 14 of main T-member 10, as shown in FIG. 4. Stop tabs 22
and 24 are vertically aligned, and divide each slot into a
connected pair of slot portions, allowing connectors 40 to be
inserted into each slot 20 from opposite sides of main T-member web
portion 14.
As each connector 40 is linearly inserted into its side of slot 20,
tab 54 bears against the main T-member web portion 14 defining that
side of slot 20 and is cammed out of the way, into recess 52,
permitting tab 54 to pass through slot 20. The resiliency of tab 54
permits deflection by such camming action. Recess 52 is disposed in
a facing relation to tab 54 and terminates at the leading edge of
connector 40 or at the juncture of tab 54 with connector 40. Recess
52 is slightly wider and appreciably longer than tab 54 in order to
accommodate and receive the latter when tab 54 is cammed inwardly
during insertion thereof through slot 20 in the main T-member web
portion 14. The forward end portion of tongue 42 is confined
between tabs 22, 24 and the side of slot 20. Further insertion of
connection 40 causes tab 54 to pass beyond web portion 14, allowing
the resiliently displaced tab 54, urged by stop 58, to snap
laterally outwardly from recess 52 to the locking position shown in
FIGS. 4 and 5. Tab 54 is thereby positioned behind web portion 14
with tab edge 56 in locking engagement thereagainst, preventing
withdrawal of connector 40 from slot 20 and holding the associated
cross T-member 12 connected to main T-member 10. Because of the
relatively long length of tab 54 as opposed to the short,
struck-out fingers known in the prior art, tab 54 is cammed
inwardly only slightly during insertion whereby upon outward urging
thereof only a small, tolerable clearance exists between edge 56
and web portion 14, of negligible effect in achieving a tight
assembled connection. In this locked position, stop shoulders 70
and 71 engage against web portion 14 to block further insertion of
connector 40. The spacing between stop shoulders 70, 71 and edge 56
is substantially the thickness of web portion 14.
It should be appreciated that in forming grid members, the web
portion is not always in perfect alignment along its entire length,
i.e., it is not always centered true with respect to the edges of
the grid member flanges. However, since the longitudinal or
lengthwise spacing between edge 56 of tab 54 and stop shoulders 70
and 71 is constant in the present invention, a tight connection
between T-members 10 and 12 is insured regardless of the
offcentered orientation of web portion 14 of main T-member 10.
Connector 40 of the other cross T-member 12 is inserted through the
other side of slot 20 in the same manner from the opposite side of
main T-member 10 to form a rigid joint. Web portions 26 of both
cross T-members 12 on opposite sides of main T-member lie in a
generally common plane. The cross T-flanges 28 abut the main
T-flanges 16, to maintain the intersecting members 10 and 12 in
right angular relation.
In order to disconnect the grid member, tab 54 is resiliently
displaced into recess 52 either by hand or with an appropriate tool
to move edge 56 from behind main T-member web portion 14. Tabs 54
face outwardly, as shown in FIG. 4, and are accessible for this
purpose. With tab 54 depressed, connector 40 is easily withdrawn
from slot 20 thereby disconnecting cross T-member 12 from main
T-member 10. Thus, tongue 42 along with channel 44 and embossment
66 provide a strong and rigid, snap-type connection which is easily
assembled, by a simple linear insertion of the connector through
the slot and which is easily disconnected. It is not necessary to
thread cross T-members 12 through slot 20. Only a simple,
straight-line axial motion is required.
From the foregoing, it is apparent that the objects of the present
invention have been fully accomplished. As a result of this
invention, an improved locking connector, formed integral with the
web portion of a support member, is provided for effecting a
strong, rigid joint between transversely extending support members
in an efficient manner. The connectors are provided with
reinforcement means to resist lateral deflection generated in the
assembled joint. By the provision of a long, tapered, reversely
bent locking tab, clearance between the web engaging edge of the
tab and the web of a support member is minimized to ensure a tight,
rigid, joint in the assembled relation. Means also are provided for
preventing such locking tab from being permanently deformed into
its depressed position, whereby the connector can be reused many
times.
A preferred embodiment of this invention having been disclosed in
detail, it is to be understood that this has been done by way of
illustration only.
* * * * *