CA1037095A - Mechanical connections between adjacent members - Google Patents
Mechanical connections between adjacent membersInfo
- Publication number
- CA1037095A CA1037095A CA243,486A CA243486A CA1037095A CA 1037095 A CA1037095 A CA 1037095A CA 243486 A CA243486 A CA 243486A CA 1037095 A CA1037095 A CA 1037095A
- Authority
- CA
- Canada
- Prior art keywords
- head
- connector
- joint
- rail
- key portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001125 extrusion Methods 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
- F16B12/10—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like
- F16B12/28—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for metal furniture parts
- F16B12/32—Jointing of furniture or the like, e.g. hidden from exterior using pegs, bolts, tenons, clamps, clips, or the like for metal furniture parts using clamps, clips, wedges, sliding bolts, or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Furniture Connections (AREA)
- Connection Of Plates (AREA)
- Insertion Pins And Rivets (AREA)
Abstract
IMPROVEMENTS IN MECHANCIAL CONNECTIONS
BETWEEN ADJACENT MEMBERS
ABSTRACT OF THE DISCLOSURE
A joint between a member having an inwardly lipped, channel-shaped cross section and a hollow rail comprises a connection including a key portion which has a head with inclined engagement surfaces located between the sides of the channel-shaped member which also includes engagement surfaces having a corresponding inclination, a clamping device engaging means on the connector to urge the engagement surfaces of the head of the key portion into locking engagement with the surfaces on the lips so that the lips are prevented from splaying apart when the joint is stressed, the connector also including a tongue portion extending away from the key portion and having a threaded hole at the base of a ramp surface, the tongue being inserted into the hollow rail. A hole in the rail is offset from the threaded hole in a direction away from the key portion and the joint also comprises a bolt having a counter-sunk head which is inserted through the hole into the threaded hole, so that, as the bolt is tightened the combination of the counter-sunk head, the offset holes and the ramp surface urge the rail towards the key portion to tighten the joint.
BETWEEN ADJACENT MEMBERS
ABSTRACT OF THE DISCLOSURE
A joint between a member having an inwardly lipped, channel-shaped cross section and a hollow rail comprises a connection including a key portion which has a head with inclined engagement surfaces located between the sides of the channel-shaped member which also includes engagement surfaces having a corresponding inclination, a clamping device engaging means on the connector to urge the engagement surfaces of the head of the key portion into locking engagement with the surfaces on the lips so that the lips are prevented from splaying apart when the joint is stressed, the connector also including a tongue portion extending away from the key portion and having a threaded hole at the base of a ramp surface, the tongue being inserted into the hollow rail. A hole in the rail is offset from the threaded hole in a direction away from the key portion and the joint also comprises a bolt having a counter-sunk head which is inserted through the hole into the threaded hole, so that, as the bolt is tightened the combination of the counter-sunk head, the offset holes and the ramp surface urge the rail towards the key portion to tighten the joint.
Description
.
~C~37~95 - This invention is concerned with a connector for use in a joint between two members, usually two mutually perpendicular metal members, and for a completed join-t incorporating the connector.
5. An example of such a joint is a joint between a leg and a rail of a table and this joint has to be I particularly strong if the design of the table does not include stretchers since the forces on the joint are substantial as the leg acts like a lever. Consequently 10. these joints are frequently the weakest points in the construction of a table and it is an aim of this invention ; to provide a connector for use in overcoming this weakness.
According to this invention, a connector for join~,ing a member having an inwardly lipped, channel-shaped 15. cross-section to a hollow rail comprises a key portion having means to engage ~ clamping device, and a tongue portion extending ~way from the key portion and having a ramp surface and a screw threaded hole at the base of the surface, a head of the key portion being, in use, arranged to slide between 20. the sides of the channel-shaped member so that a clamping device engaging the means urges the head of the key .i portion against the lips of the channel to fix - the connector to the member, the rail sliding over the ,~
~C~37~95 - This invention is concerned with a connector for use in a joint between two members, usually two mutually perpendicular metal members, and for a completed join-t incorporating the connector.
5. An example of such a joint is a joint between a leg and a rail of a table and this joint has to be I particularly strong if the design of the table does not include stretchers since the forces on the joint are substantial as the leg acts like a lever. Consequently 10. these joints are frequently the weakest points in the construction of a table and it is an aim of this invention ; to provide a connector for use in overcoming this weakness.
According to this invention, a connector for join~,ing a member having an inwardly lipped, channel-shaped 15. cross-section to a hollow rail comprises a key portion having means to engage ~ clamping device, and a tongue portion extending ~way from the key portion and having a ramp surface and a screw threaded hole at the base of the surface, a head of the key portion being, in use, arranged to slide between 20. the sides of the channel-shaped member so that a clamping device engaging the means urges the head of the key .i portion against the lips of the channel to fix - the connector to the member, the rail sliding over the ,~
- 2 -!
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~13370~5 -tongue portion towards the key portion and a bolt having a counter-sunk head being inserted through a hole in the rail and being screwed into the threaded hole, the head of the bolt cooperating with the 5. ramp suface to urge the rail towards the key portion as . the bolt is screwed into the threade hole to ensure a rigid joint. ::~
According to another aspect of this invention a joint between a member having an inwardly lipped, channel-. 10. shaped cross-section and.a hollow rail comprises a : -:
: connector including a key portion which has a head ,~, .
l located between the sides of the channel-shaped member, ~ ::
~ clamp.ing device engaging means on the connector to urge j . the head of the key portion into locking engagement .
15. with the lips, the connector also including a tongue ~:
portion extending away from the key portion and having a screw-threaded hole at the base of a ramp surface, .
-l the tongue being inserted into the hollow rail, ..
a hole in the rail being offset from the screw-~;~ 20. threaded hole in a direction away from the key portion, .~ the joint also comprising a bolt having a counter- : .
; sunk head which is inserted through the hole into : .
~ the ~eaded hole, so that, as the bolt is tightened : . .
.~` the combination of the counter-sunk head, the . .
. . .
' 25. offset holes and the ramp surface urge the ~, . . . .
~ ~ 3 ~ ~ .
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rail towards the key portion to tighten the joint.
Preferably the faces of the head of the key portion which are directed towards the remainder of the connector are arranged at an acute angle to the axis of the connector 5. and the inner faces of the lips of the channel-shaped member have a corresponding inclination, so that, when the clamping device urges the head of the key portion into engagement with the lips of the member the correspondingly inclined faces urge the lips towards one another and so prevent the ; 10. side walls of the channel-shaped member ~rom splaying open when the joint is stressed.
The head of the key portion may be separate from J the remainder of the connector and the clamping device may be arranged to pull the head towards the remainder of the 15. connector so sandwiching the lips of the channel-shaped member between the head and the remainder of the connec-tor.
l When the head of the key portion of the connector is .! separate the connector may include a shoulder which acts as a spacer between the channel-shaped member and the rail~
20. the clamping device clamping the lips of the channel-shaped member between the head and the shoulder and the counter-j sunk headed bolt urging the rail against the other side of I the shoulder. Alternatively the head may be mtegral with the connector and in this case the clamping device is ~ 25. preferably a grub screw and the means in the connector is `.~ , .
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.
preferably an axial threaded bore extending through - a neck of the connector join ing the head to the remainder : of the connector so that when the grub screw is screwed into the bore and tightened~ the grub screw bears 5. against the base of the channel-shaped member an.d urges the head of the connector against the lips of the channel-shaped member.
The ramp surface may be flat and inclined in the ; same sense as the inclined surface on the head of the key 10. portion but pre~erably it is a frusto-conical sur~ace which surrounds the screw-threaded hole in the tongue of the connector like an enlarged countersink. Preferably the connector includes at least two threaded holes, each having a corresponding frusto-conical ramp surface and in 15. this case a counter-sunk bolt is also inserted into the other threaded hole.
When the head of the key portion of the connector -~
.I ,.,- .. .
~i .ts separate the clamping device pre~erably includes a `~
i strip of metal which is placed between a pair of opposed 20. grooves in the remainder of the connector and which ~ includes at least one hole, a bolt passing through the,
,1`
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.
r~
~13370~5 -tongue portion towards the key portion and a bolt having a counter-sunk head being inserted through a hole in the rail and being screwed into the threaded hole, the head of the bolt cooperating with the 5. ramp suface to urge the rail towards the key portion as . the bolt is screwed into the threade hole to ensure a rigid joint. ::~
According to another aspect of this invention a joint between a member having an inwardly lipped, channel-. 10. shaped cross-section and.a hollow rail comprises a : -:
: connector including a key portion which has a head ,~, .
l located between the sides of the channel-shaped member, ~ ::
~ clamp.ing device engaging means on the connector to urge j . the head of the key portion into locking engagement .
15. with the lips, the connector also including a tongue ~:
portion extending away from the key portion and having a screw-threaded hole at the base of a ramp surface, .
-l the tongue being inserted into the hollow rail, ..
a hole in the rail being offset from the screw-~;~ 20. threaded hole in a direction away from the key portion, .~ the joint also comprising a bolt having a counter- : .
; sunk head which is inserted through the hole into : .
~ the ~eaded hole, so that, as the bolt is tightened : . .
.~` the combination of the counter-sunk head, the . .
. . .
' 25. offset holes and the ramp surface urge the ~, . . . .
~ ~ 3 ~ ~ .
; I , .
~037~9S
rail towards the key portion to tighten the joint.
Preferably the faces of the head of the key portion which are directed towards the remainder of the connector are arranged at an acute angle to the axis of the connector 5. and the inner faces of the lips of the channel-shaped member have a corresponding inclination, so that, when the clamping device urges the head of the key portion into engagement with the lips of the member the correspondingly inclined faces urge the lips towards one another and so prevent the ; 10. side walls of the channel-shaped member ~rom splaying open when the joint is stressed.
The head of the key portion may be separate from J the remainder of the connector and the clamping device may be arranged to pull the head towards the remainder of the 15. connector so sandwiching the lips of the channel-shaped member between the head and the remainder of the connec-tor.
l When the head of the key portion of the connector is .! separate the connector may include a shoulder which acts as a spacer between the channel-shaped member and the rail~
20. the clamping device clamping the lips of the channel-shaped member between the head and the shoulder and the counter-j sunk headed bolt urging the rail against the other side of I the shoulder. Alternatively the head may be mtegral with the connector and in this case the clamping device is ~ 25. preferably a grub screw and the means in the connector is `.~ , .
, ~ - 4 -.~ , '::
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.
preferably an axial threaded bore extending through - a neck of the connector join ing the head to the remainder : of the connector so that when the grub screw is screwed into the bore and tightened~ the grub screw bears 5. against the base of the channel-shaped member an.d urges the head of the connector against the lips of the channel-shaped member.
The ramp surface may be flat and inclined in the ; same sense as the inclined surface on the head of the key 10. portion but pre~erably it is a frusto-conical sur~ace which surrounds the screw-threaded hole in the tongue of the connector like an enlarged countersink. Preferably the connector includes at least two threaded holes, each having a corresponding frusto-conical ramp surface and in 15. this case a counter-sunk bolt is also inserted into the other threaded hole.
When the head of the key portion of the connector -~
.I ,.,- .. .
~i .ts separate the clamping device pre~erably includes a `~
i strip of metal which is placed between a pair of opposed 20. grooves in the remainder of the connector and which ~ includes at least one hole, a bolt passing through the,
-3 d or each, hole and being screwed into a threaded bore `~ in the separate key portion of the connector so that as 3; the, or each, bolt is screwed into the key portion the 25. key portion moves towards the remainder of the connector ~ ., .
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to sandwich the lips o~ the channel-shaped member between the key portion and the remainder of the connector.
This invention is particularly useful when the two members to be joined are extruded aluminium sections.
When the rail is made from an extruded aluminium section it has the further advantage that, as the bolt is tightened in the threaded hole in the connector, the side wall of the extrusion is deformed by the counter-sunk head towards the connector, the slight resilience o~ the , . .
10.aluminium side wall serving to lock the joint together and lock the bolt in the same way as a spring washer.
The inwardly lipped channel-shaped member may form a part of an extrusion having a generally arcuate cross-section or a L-shaped cross-section. In both of 15.these cases where the extrusion is being used as a leg of a table it preferably includes an inwardly lipped channel-shaped member along each o~ its edges so that one rail may be connected to each edge of the extrusion.
¦ The rail may be C-shaped or U-shaped in cross-section but , 20.it is very much stronger if it has a closed, recta~g~lar hollow section and thus such a section is pre~erred.
'I ' , .
Examples of connectors and joints in accordance with our invention which are ~sed to join a leg and a rail of a table having four legs will now be described with 25.reference to the accompanying drawings, in which:-Figure 1 is an exploded p~spective view of a first .~,~ . ', . .
example;
~ .
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Figure 2 is a horizontal section through the partly assembled joint; and, Figure 3 is an exploded perspective view of a second example.
. 5. The flrst example shown in Figures 1 and 2 comprises a connector 1, a leg 2 and a rail 3. The connec-tor 1 includes a separate head.
: 4 with its associated clamping device formed by a ;, strip 5 and a pair of set screws 6, the clamping device .
10. joining the head 4 to the remainder of the .-.
, , connector 1. The remainder of the connector 1 includes a tongue portion 7 in which two screw-threaded holes 8 .. ~-l are formed, the holes having countersinks 9 formed in `
one face of the tongue portion 7.
~ 15. The connector 1 also includes a groove 10 which :.
.j is arranged to receive the heads of the set screws 6 and ~
.. . .. .
¦ a pair o~ opposed grooves 11 which are arranged to receive the strip 5. A pair of drillings 12 are also provided which are in alignment with the set screws 6 to give 20~ access to ~he heads of the set screws 6 to enable them ~ to be tightened. :.
;.1 The leg 2 includes a channel-shaped member 13 ;
along eaoh of its edges and each channel-shaped member i 13 includes a pair of inwardly directed lips 14. Internal .
`~ 25. faces I5 on the lips 14 are inclined at an acute angle to . .
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1 ~ ~ 7 ~
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-.
103~9~i the sides of the channel-shaped member 13. The separate head . 4 also include~ a pair of inclined faces 16 which are inclined at an acute angle to the axis of the connector 1 at a correspondi.ng inclination to the inclination 5. of the ~aces 15. The connector 1 also includes a pair of ` ribs 17~projecting towards the head 4 from each ; side of the groove 10.
To assemble this example of the joint the ~ .
head 4 of -the connector is slid between the 10. side walls of the channel-shaped member 13 of the leg 2 until it reaches its required location. The set screws 6 1 are then tightened using an Allen key inserted through the :
^, drillings 12 to fix the connector 1 onto the leg 2. The .'i ribs 17~are received in the slot between the lips 14 of ~ -`' 15 the channel-shaped member 13 and this prevents the i connector at the sides of the groove 10 from splaying .
I open as the set screws 6 are tightened. The cooperating :l inclined faces 15 and 16 formed on the lips of the channel- .
~¦ shaped member and on the head 4 of the ;. 1 .
20. connector tend to ride over one another to draw the lips ;; 14 o~ the channel-shaped member together and prevent the :
`I channel-shaped member 13 from splaying open when the joint is stressed. Thus when the set screws 6 have been fully tightened the connector 1 is locked onto the leg 2 25. in such a way that each of the various.parts of the .
connector 1- cooperate and interfit so that a very secure 3 : .
l 8 '`1 - ' ' : ~[)3711195 connection is made between the leg 2 and the connector 1.
The rail 3 is of rectangular box-section and includes a pair of holes 17 which correspond to the screw- ,~
threaded holes 8. To assemble the joint the rail 3 is -, slid over the tongue portion 7 of the connector 1 anc,when the end of the rail 3 is butted up against the edge of the leg 2,the holes 17 are offset from the threaded holes 8 in a direction away from the leg 2 by a distance A as shown in Figure 2. To fix the rail 3 onto the connector 1 a :, pair of bolts 18 having counter-sunk heads are inserted through the holes 17 and into the screw-threaded holes 8.
As the bolts 15 are tightened the counter-sunk heads engage ' the sides of the holes 17 nearest the end of the rail 3 , and as the bolts are further tightened their counter-sunk heads urge the rail 3 against the edge of the leg 2. This ensures that the rail 3 is fitted tightly against the edge ;
of the leg 2 which gives a neat and clean appearance ~or '', the completed joint and since it puts the abutting surfaces ' o~ the leg 2 and the rail 3 under co~pression it increases ~ , the strength of the completed joint. As the bolts 18 are tight,ened, the side wall of the rail 3 is deformed into ,,~
I ~ ....
~', the counter-sunk portions 9 of the connector 1, so that, : ' .. . .
',! ' the heads of the bolts are accommodated. ' .'J In this example the connector 1, the leg 2 and ;"
~ 25. the rail 3 are all formed'by aluminium extrusions. The '? .~
'-i ' '~''.
: ~037~95 ; natural sllght resilience of aluminium ensures -that as the side wall o~ -the rail 3 is deformed it acts as a compressed sprlng to provide a force urging the rail 3 towards the leg 2 and acts as a spring washer so that 5. the bolts 18 will not work loose.
The second example shown in Figure 3 operates in esse~ially the same way and, where appropriate, similar reference numerals have been given to corresponding parts.
In this example the head 4 is rigidly fixed to the remainder 10. of the connector by a neck 19 and the connector 1 is also provided with a pair of screw-threaded holes 20 which receive a pair of grub screws 21. To assemble this example the head 4 is slid into the channel-shaped member 13 on the leg 2 until it is in the required position and then ~, 15. the grub screws 21 are tig~tened until they engage the base o~ the channel-shaped member 13. Further tightening o~ the grub screws 21 drives the head 4 away from the base of the channel-shaped member 13 and causes the inclined ~aces 15 and 16 into enga~ement. Once again the faces 15 and 16 tend 20. to ride over one another and in doing so draw the lips 14 of . ., ! the channel-shaped members together which prevents the sides of the channel-shaped members splaying open when the completed joint is stressed. The rail 3 is then slid over `
' I , '.
, the tongue portion 7 o~ the connector 1 and connected in an 25. - analagous fashion to the first example.
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The angle subtended by the arcuate leg member 2 is preferably 91~ degrees and in this case when the leg frame of the table is completed the outside of the joints between the legs and the rails will be urged together more `! 5. firmly than the inside of the jolnts. This feature - contributes to the formation of a close fitting joint between the leg 2 and the rail 3. The completed Joint in both these examples gives a very clean and neat outside appearance and the connector is also completely obscured.
10. When the leg is made from an aluminium extrusion the resilience of the material coupled with its arcuate section ;
allows the leg to flex to accommodate slight distortions.
' This elastic flexing, means that as -the table is moved in ~
use and put under stress, slight distortions will be `' ' 15. accommodated and the material will not be plastically ~ de~ormed unless the table is subjected to very severe 1 treatment, Thus the completed table will be more robust ~1 than a table with legs having a very rigid cross-section.
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to sandwich the lips o~ the channel-shaped member between the key portion and the remainder of the connector.
This invention is particularly useful when the two members to be joined are extruded aluminium sections.
When the rail is made from an extruded aluminium section it has the further advantage that, as the bolt is tightened in the threaded hole in the connector, the side wall of the extrusion is deformed by the counter-sunk head towards the connector, the slight resilience o~ the , . .
10.aluminium side wall serving to lock the joint together and lock the bolt in the same way as a spring washer.
The inwardly lipped channel-shaped member may form a part of an extrusion having a generally arcuate cross-section or a L-shaped cross-section. In both of 15.these cases where the extrusion is being used as a leg of a table it preferably includes an inwardly lipped channel-shaped member along each o~ its edges so that one rail may be connected to each edge of the extrusion.
¦ The rail may be C-shaped or U-shaped in cross-section but , 20.it is very much stronger if it has a closed, recta~g~lar hollow section and thus such a section is pre~erred.
'I ' , .
Examples of connectors and joints in accordance with our invention which are ~sed to join a leg and a rail of a table having four legs will now be described with 25.reference to the accompanying drawings, in which:-Figure 1 is an exploded p~spective view of a first .~,~ . ', . .
example;
~ .
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Figure 2 is a horizontal section through the partly assembled joint; and, Figure 3 is an exploded perspective view of a second example.
. 5. The flrst example shown in Figures 1 and 2 comprises a connector 1, a leg 2 and a rail 3. The connec-tor 1 includes a separate head.
: 4 with its associated clamping device formed by a ;, strip 5 and a pair of set screws 6, the clamping device .
10. joining the head 4 to the remainder of the .-.
, , connector 1. The remainder of the connector 1 includes a tongue portion 7 in which two screw-threaded holes 8 .. ~-l are formed, the holes having countersinks 9 formed in `
one face of the tongue portion 7.
~ 15. The connector 1 also includes a groove 10 which :.
.j is arranged to receive the heads of the set screws 6 and ~
.. . .. .
¦ a pair o~ opposed grooves 11 which are arranged to receive the strip 5. A pair of drillings 12 are also provided which are in alignment with the set screws 6 to give 20~ access to ~he heads of the set screws 6 to enable them ~ to be tightened. :.
;.1 The leg 2 includes a channel-shaped member 13 ;
along eaoh of its edges and each channel-shaped member i 13 includes a pair of inwardly directed lips 14. Internal .
`~ 25. faces I5 on the lips 14 are inclined at an acute angle to . .
''''i ' ' ' ' . .. ..
1 ~ ~ 7 ~
, .: , , '~ .
..
-.
103~9~i the sides of the channel-shaped member 13. The separate head . 4 also include~ a pair of inclined faces 16 which are inclined at an acute angle to the axis of the connector 1 at a correspondi.ng inclination to the inclination 5. of the ~aces 15. The connector 1 also includes a pair of ` ribs 17~projecting towards the head 4 from each ; side of the groove 10.
To assemble this example of the joint the ~ .
head 4 of -the connector is slid between the 10. side walls of the channel-shaped member 13 of the leg 2 until it reaches its required location. The set screws 6 1 are then tightened using an Allen key inserted through the :
^, drillings 12 to fix the connector 1 onto the leg 2. The .'i ribs 17~are received in the slot between the lips 14 of ~ -`' 15 the channel-shaped member 13 and this prevents the i connector at the sides of the groove 10 from splaying .
I open as the set screws 6 are tightened. The cooperating :l inclined faces 15 and 16 formed on the lips of the channel- .
~¦ shaped member and on the head 4 of the ;. 1 .
20. connector tend to ride over one another to draw the lips ;; 14 o~ the channel-shaped member together and prevent the :
`I channel-shaped member 13 from splaying open when the joint is stressed. Thus when the set screws 6 have been fully tightened the connector 1 is locked onto the leg 2 25. in such a way that each of the various.parts of the .
connector 1- cooperate and interfit so that a very secure 3 : .
l 8 '`1 - ' ' : ~[)3711195 connection is made between the leg 2 and the connector 1.
The rail 3 is of rectangular box-section and includes a pair of holes 17 which correspond to the screw- ,~
threaded holes 8. To assemble the joint the rail 3 is -, slid over the tongue portion 7 of the connector 1 anc,when the end of the rail 3 is butted up against the edge of the leg 2,the holes 17 are offset from the threaded holes 8 in a direction away from the leg 2 by a distance A as shown in Figure 2. To fix the rail 3 onto the connector 1 a :, pair of bolts 18 having counter-sunk heads are inserted through the holes 17 and into the screw-threaded holes 8.
As the bolts 15 are tightened the counter-sunk heads engage ' the sides of the holes 17 nearest the end of the rail 3 , and as the bolts are further tightened their counter-sunk heads urge the rail 3 against the edge of the leg 2. This ensures that the rail 3 is fitted tightly against the edge ;
of the leg 2 which gives a neat and clean appearance ~or '', the completed joint and since it puts the abutting surfaces ' o~ the leg 2 and the rail 3 under co~pression it increases ~ , the strength of the completed joint. As the bolts 18 are tight,ened, the side wall of the rail 3 is deformed into ,,~
I ~ ....
~', the counter-sunk portions 9 of the connector 1, so that, : ' .. . .
',! ' the heads of the bolts are accommodated. ' .'J In this example the connector 1, the leg 2 and ;"
~ 25. the rail 3 are all formed'by aluminium extrusions. The '? .~
'-i ' '~''.
: ~037~95 ; natural sllght resilience of aluminium ensures -that as the side wall o~ -the rail 3 is deformed it acts as a compressed sprlng to provide a force urging the rail 3 towards the leg 2 and acts as a spring washer so that 5. the bolts 18 will not work loose.
The second example shown in Figure 3 operates in esse~ially the same way and, where appropriate, similar reference numerals have been given to corresponding parts.
In this example the head 4 is rigidly fixed to the remainder 10. of the connector by a neck 19 and the connector 1 is also provided with a pair of screw-threaded holes 20 which receive a pair of grub screws 21. To assemble this example the head 4 is slid into the channel-shaped member 13 on the leg 2 until it is in the required position and then ~, 15. the grub screws 21 are tig~tened until they engage the base o~ the channel-shaped member 13. Further tightening o~ the grub screws 21 drives the head 4 away from the base of the channel-shaped member 13 and causes the inclined ~aces 15 and 16 into enga~ement. Once again the faces 15 and 16 tend 20. to ride over one another and in doing so draw the lips 14 of . ., ! the channel-shaped members together which prevents the sides of the channel-shaped members splaying open when the completed joint is stressed. The rail 3 is then slid over `
' I , '.
, the tongue portion 7 o~ the connector 1 and connected in an 25. - analagous fashion to the first example.
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':''' 1037i~S
The angle subtended by the arcuate leg member 2 is preferably 91~ degrees and in this case when the leg frame of the table is completed the outside of the joints between the legs and the rails will be urged together more `! 5. firmly than the inside of the jolnts. This feature - contributes to the formation of a close fitting joint between the leg 2 and the rail 3. The completed Joint in both these examples gives a very clean and neat outside appearance and the connector is also completely obscured.
10. When the leg is made from an aluminium extrusion the resilience of the material coupled with its arcuate section ;
allows the leg to flex to accommodate slight distortions.
' This elastic flexing, means that as -the table is moved in ~
use and put under stress, slight distortions will be `' ' 15. accommodated and the material will not be plastically ~ de~ormed unless the table is subjected to very severe 1 treatment, Thus the completed table will be more robust ~1 than a table with legs having a very rigid cross-section.
1 , :
~'1 ' : . ' ' ,., }~. ,' '` ~ ' . ', ":
' '': , `'l -' . .
Claims (7)
1. A joint comprising an inwardly lipped, channel-shaped member, a hollow rail and a connector, a key portion of said connector, a head of said key portion, said head being located in said channel-shaped member, engagement surfaces of said head directed towards said connector and inclined at an acute angle, engagement surfaces on said lips having an inclination corresponding that that of said engagement surfaces on said head, a clamping device, engaging means on said connector co-operating with said clamping device to urge said engagement surfaces on said head into locking engagement with said engagement surfaces on said lips whereby said lips are prevented from splaying apart when said joint is stressed, a tongue portion of said connector e tending away from said key portion, a ramp surface on said tongue portion, a screw-threaded hole at the base of said ramp surface, said tongue being inserted in said hollow rail, a hole in said rail offset from said screw-threaded hole in a direction away from said key portion, and a counter-sunk headed bolt inserted through said hole in said rail into said screw threaded hole, whereby on tightening of said bolt the combination of said counter-sunk head, said offset holes and said ramp surface urge said rail towards said key portion to tighten said joint.
2. The joint of claim 1, wherein said head of said key portion is separate from the remainder of said connector and said clamping device is arranged to pull said head towards said remainder whereby said lips of said channel-shaped member are sandwiched between said head and said remainder.
3. The joint of claim 2, wherein said clamping device includes at least one screw-threaded fastener which is arranged to pull said head towards said remainder.
4. The joint of claim 1, wherein said head and said connector are integral, said clamping device is a grub screw, and said engaging means is an axial threaded bore extending through said connector, whereby when said grub screw is inserted in said threaded bore and tightened, said grub screw bears against the base of said channel-shaped member and urges said head against said lips.
5. The joint of claim 1 wherein said ramp surface is formed as a frusto conical surface, said surface surrounding said threaded hole.
6. The joint of claim 1 wherein said member, said connector and said rail are each extruded from aluminium.
7. The joint of claim 6 wherein said extrusion forming said member is generally arcuate in cross-section, said extrusion including one of said inwardly lipped channel-shaped members along each of its edges, and wherein said rail has a closed rectangular cross-section.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB160075A GB1488083A (en) | 1975-01-14 | 1975-01-14 | Mechanical connections between adjacent members |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1037095A true CA1037095A (en) | 1978-08-22 |
Family
ID=9724766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA243,486A Expired CA1037095A (en) | 1975-01-14 | 1976-01-12 | Mechanical connections between adjacent members |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1037095A (en) |
| DE (1) | DE2600816A1 (en) |
| ES (1) | ES231863Y (en) |
| GB (1) | GB1488083A (en) |
| NL (1) | NL7600317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886326A (en) * | 1988-01-29 | 1989-12-12 | Tetrad Marketing/Sales Ltd. | Interlock system for ready to assemble furniture, and furniture incorporating such system |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123512A (en) * | 1982-07-01 | 1984-02-01 | Ronald Francis Denman | Structural assembly |
| DE3232766C1 (en) * | 1982-09-03 | 1984-03-22 | 3K-Büromöbel GmbH, 6143 Lorsch | Frame comprising profile sections |
| DE3319627C2 (en) * | 1983-05-30 | 1985-08-14 | Heinz Georg Hünibach Thun Baus | Corner connection |
| DE3446734A1 (en) * | 1984-12-21 | 1986-07-03 | Iveco Magirus AG, 7900 Ulm | BOX CONSTRUCTION, ESPECIALLY FOR COMMERCIAL VEHICLES LIKE FIRE PROTECTION VEHICLES |
| DE3635039A1 (en) * | 1986-10-15 | 1988-04-21 | Iveco Magirus | BOX CONSTRUCTION, ESPECIALLY FOR COMMERCIAL VEHICLES, FOR EXAMPLE FIRE PROTECTION VEHICLES |
| GB2198803B (en) * | 1986-12-05 | 1990-11-07 | Eric Keith Cheng | Connector for structures |
| CH681383A5 (en) * | 1990-04-11 | 1993-03-15 | Alusuisse Lonza Services Ag | |
| FR2712046A1 (en) * | 1993-11-05 | 1995-05-12 | Benoit Antoine | Support section, seal interacting with such a section and assembly comprising the section and the seal |
| DE29801231U1 (en) | 1998-01-27 | 1999-06-02 | Recticel Internationale Bettsysteme GmbH, 59439 Holzwickede | Bed frame |
| SK286964B6 (en) * | 2004-05-17 | 2009-08-06 | Peter Čupka | Space structural system compact of modular joining elements |
| US8992114B2 (en) * | 2008-01-30 | 2015-03-31 | Boseth Pty Ltd | Connector assembly |
| CN103287443B (en) * | 2013-06-26 | 2016-01-20 | 山东裕航特种合金装备有限公司 | A kind of combined inserting structure |
| EP2980423B1 (en) * | 2014-07-29 | 2016-10-19 | Italiana Ferramenta S.r.l. | Jointing device for connecting panels of furniture pieces with adjustable traction |
-
1975
- 1975-01-14 GB GB160075A patent/GB1488083A/en not_active Expired
-
1976
- 1976-01-12 DE DE19762600816 patent/DE2600816A1/en not_active Withdrawn
- 1976-01-12 CA CA243,486A patent/CA1037095A/en not_active Expired
- 1976-01-13 NL NL7600317A patent/NL7600317A/en not_active Application Discontinuation
- 1976-01-13 ES ES1976231863U patent/ES231863Y/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886326A (en) * | 1988-01-29 | 1989-12-12 | Tetrad Marketing/Sales Ltd. | Interlock system for ready to assemble furniture, and furniture incorporating such system |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7600317A (en) | 1976-07-16 |
| GB1488083A (en) | 1977-10-05 |
| DE2600816A1 (en) | 1976-07-15 |
| ES231863Y (en) | 1978-05-16 |
| ES231863U (en) | 1978-01-01 |
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