FR2680196A1 - DEVICE FOR ASSEMBLING AND ATTACHING AN END OF A RUNWAY TO AN EDGE AND SCAFFOLDING SYSTEM COMPRISING TRAVERS HAVING EACH OF THE END OF SUCH A DEVICE. - Google Patents

Abstract

The present invention relates to a device for assembling and fixing one end of a cross member to an upright. The device is characterized in that it comprises a tilting latch (12) in the form of a lever bent at a right angle mounted in the assembly head (9) integral with the cross member and whose upper lever arm (12b) serves as tilting control of the latch (12) by contacting the upper edge of a cup (4) and the lower lever arm (12a) serves as a retaining member of a hook member (11) in the cup (4) . The present invention finds application in particular in scaffolding systems used in the building industry.

Description

The present invention relates to an assembly and fixing device

from one end of a

crosses to an amount.

  The invention applies in particular to a scaffolding system used in the building where the tubular sleepers, horizontal or diagonal, are provided at each of their ends with the device for assembling and fixing them to the uprights.

corresponding tubulars.

  Such devices are known comprising a cup integral with an amount coaxially with it and open upwards, an assembly head from one end of the crossbar to the cup and comprising a hook member engaging in the cup and a key for locking or locking the hook member in the cup passing through the assembly head. However, these known devices when used in a scaffolding system are unsatisfactory in terms of safety because as long as the key is not hammered, the hook member of the crossbar can disengage accidentally from the corresponding cup Such an accidental disengagement can also occur when the key is depressed in particular in the event of a major impact under the cross member Moreover, to ensure the assembly and fixing of the end of the crossbar to the corresponding amount, the key takes bearing directly on the outer side wall of the cup, which results in an assembly related to the elasticity of the cup; in other words, fixing the end

  from the crossbar to the upright is not rigid enough.

  The present invention aims to eliminate the above disadvantages by providing a device for assembling and fixing an end of a cross member to a post preventing accidental disengagement of the cross member of the cup as well before after hammer penetration of the key and providing an extremely rigid attachment of the end

from the transom to the upright.

  For this purpose, the device according to the invention, of the type comprising a recessed attachment piece secured to the upright coaxially thereto, an assembly head of the crossbar to the fastener, attached to the end of the cross-member and comprising a hook member engaging in the fastener, and a latch or locking key of the hook member in the fastener through the fastener head, is characterized in that it comprises a right angle bent lever latch bolt mounted in the assembly head and with the upper lever arm acting as a tilt control for the latch by approximately contacting the outer edge of the fastener and the lower lever arm serving retainer member of the hook member in the fastener

  positioning itself under the latter.

  According to a feature of the invention, in the position before assembly, the key occupies an oblique inactive position with its lower end resting on the upper lever arm of the rocking lock so as to lock the latter in an inactive position allowing the introduction of the hook member in the fastener and, during the tilting of the rocking lock to its aforementioned active holding position, the key automatically falls by gravity through the assembly head to an active locking position of the latch tilting to its active retaining position at which the front end of the lower lever arm is supported on the side wall of the

amount.

  According to yet another characteristic of the invention, the key comprises a branch forming a head substantially perpendicular to its longitudinal portion and bearing on the side wall of the upright at the active locking position of the rocking lock. After driving the hammer of the key, the longitudinal portion of the key exerts on the assembly head a force such that the head branch of the key, the front end of the lower lever arm of the rocker lock are in forced support on the side wall of the upright and the lower lever arm is in force under the fixing piece so that the hook member exerts in reaction on the fastener a radial tensile force now

  firmly this organ in said room.

  Advantageously, the front end of the lower lever arm of the tilting bolt and the front end of the head branch of the key are curved so as to match the tubular side wall.

the amount.

  Preferably, the key, the rocking latch and the hook member are disposed substantially in the same plane of longitudinal median symmetry of the

assembly head.

  The key is housed captively in

the aforementioned assembly head.

  Preferably, the fastener is cup-shaped open upwards and comprises an upwardly diverging frustoconical ring fixed to a cylindrical central core, integral with the amount concentrically to the latter, by gussets or radial fins of the same dimensions so as to form

  openings between fins or gussets.

  The aforementioned rocking latch is mounted in the assembly head by pivoting about a pivot axis fixed transversely to the assembly head or, alternatively, by two coaxial lugs integral on either side of the tilting bolt and rotatably housed respectively in two bores

  transverse of the assembly head.

  Advantageously, the head branch of the key, in depressed locking position of the latter, is housed at least partially in a groove of the assembly head in the plane of symmetry of the head and has its upper part located at the level of

the crossing.

  The invention also proposes a scaffolding system comprising tubular uprights and horizontal or diagonal tubular sleepers and which is characterized in that each crosspiece has at each of its two ends an assembly device.

  and fixing as defined above.

  In the case where the crossbar is horizontal, the assembly head is fixed rigidly to the corresponding end of the crossbar, while in the case where the cross member is a cross-brace, the assembly head is pivotally attached to the crosshead. corresponding end of

the brace.

  The invention will be better understood and other purposes, features, details and advantages thereof

  will become clearer during the description

  following explanatory diagram with reference to the accompanying schematic drawings given solely by way of example illustrating an embodiment of the invention and in which: Figure 1 shows a side view of the assembly device and fixing a end of a transom to an upright; Figure 2 is a top view along the arrow II of Figure 1 and showing several sleepers fixed to the same amount by several identical devices according to the invention Figure 3 is a sectional view similar to Figure 1 showing the device according to to the invention before assembling the end of a cross member to the amount; Figure 4 is a view identical to Figure 3 and showing the device of the invention in the assembled position and fixing the end of the cross member to the amount; Figure 5 is a sectional view along the line V-V of Figure 4 with the lock key raised with respect to Figure 4; Figure 6 is a sectional view along the line VI-VI of Figure 4; and FIG. 7 is a variant embodiment

of Figure 6.

  The device according to the invention will be described in application to a scaffolding system used in the building and comprising tubular uprights to which are fixed horizontal crosspieces,

either diagonal or braces.

  Referring to the figures, reference numeral 1 denotes an end of a tubular cross member fixed to a tubular upright 2 via the device

  assembly and attachment 3 of the invention.

  The device 3 firstly comprises a metal cup 4 constituted by a ring 5 preferably of frustoconical shape diverging upwardly fixed, by means of radial fins 6 of the same dimension and regularly angularly spaced about the longitudinal axis XX 'of the upright 2 and coaxially with the latter, a central cylindrical metal core 7 which is fixed to the cylindrical side wall of the upright 2 for example by welding The fins 6 can be replaced by gussets and define between them identical openings 8 allowing the passage of rainwater and various projections (sand, cement, building materials), falling in the annular space defined between the ring 5 and the side wall of the upright 2, thus facilitating cleaning with respect to a cup with a solid bottom The fins 6 have a height allowing excellent mechanical strength and the cup 4 can be obtained by stamping, fo In addition, the frustoconical shape of the ring 5 of the cup 4 facilitates the assembly and disassembly of the

  device that will be explained later.

  The device 3 further comprises an assembly head 9 which is fixed either rigidly, for example by welding, at the end of the crossbar 1 when the latter is horizontal, or articulated about an axis of articulation 10 at a tab-shaped end la of a cross-member 1 when the latter is

a brace.

  The assembly head 9 comprises a hook-shaped member 11 engageable in the upper annular space defined between the ring 5 and the side wall of the upright 2. The hook member 11 extends substantially perpendicular to the longitudinal axis of the crossbar 1 and has its curved frontal surface with a radius of curvature substantially identical to the

  radius of curvature of the side wall of the upright 2.

  The assembly head 9 further comprises a tilting latch 12 in the form of a right angle bent lever mounted in the head 9 so as to be pivotable either about an axle 13 fixed transversely in the head 9, or via two coaxial lugs 14 integral on either side of the rocking latch 12 and rotatably housed respectively in two bores

  transverse 15 of the assembly head 9.

  The rocking lock 12 can pivot in a recess 16 passing right through the assembly head 9 perpendicular to the axis of the crosspiece 1 between an inactive position shown in FIG. 3 and an active position shown in FIG. 4 at which the arm of lower lever 12a, in the form of a plate, serves as a retaining element of the hook member 11 in the cup 4 while coming into forced support, in final mounting position, under the cup 4 opposite the hook member 11 and on the side wall of the

amount 2.

  The device 3 finally comprises a key or wedge 17 for locking the hook member 11 in the cup 4 The key 17 comprises an elongated portion 18 with an oblique front surface 18a and a head portion 19 constituted by a substantially perpendicular limb at the portion 18 and extending towards the upright 2 The key 17 may be defined otherwise as being in the form of a "7" 'The key 17 is housed captively in the through recess 16 of the head 9 For this purpose, the key 17 comprises in the vicinity of its lower end two opposite lugs abutting against two shoulders 21 machined respectively in the two parallel walls defining the recess 16 and located in the vicinity of the upper opening of the recess 16 The front end of the branch 19 of the key 17 is curved in the same way as that of the lower arm 12a, which avoids punching and deformation lo wedge

tube.

  As shown in FIG. 3, the key 17 occupies an inactive oblique position bearing on its opposite surface to the surface 18a on an oblique wall 9a of the assembly head 9 and has its lower end resting on the upper lever arm 12b of the rocking lock 12 so as to maintain

  the latter at its inactive position in the head 9.

  The hook member 11, the key 17 and the rocking latch 12 are housed in the recess 16 being disposed substantially in the same plane of symmetry

  longitudinal center of the assembly head 9.

  The operation of the device of the invention

  already apparent from the description that has been made

  above and will now be explained.

  To assemble the end of a crossbar 1 to the upright 2, the assembly head 9 is positioned relative to the cup 4 as shown in FIG. 3, that is to say with the hook member 11 above the cup 4 The assembly head 9 is then lowered until the upper lever arm 12b of the rocking lock 12 contacts the upper edge of the cup 4, which causes the pivoting or tilting of the 12 lock in the direction of clockwise so as to allow the hook member 11 to be introduced into the cup 4 and the lower lever arm of the latch 12 to be positioned under the cup 4 When switching the 12, the upper lever arm 12b causes the key 17 to pivot from its inactive oblique position to a substantially vertical position by acting on the lower end of the key 17 When the lower lever arm 12 is under the neck shovel 4, it releases a passage in the recess 16 allowing the key 17 to fall automatically by gravity through the assembly head 9 to a position shown in dashed lines in Figure 4 As is apparent from this figure, the the front end of the lower lever arm 12a is supported on the side wall of the upright 2 likewise for the front end of the head branch 19 of the key 17 and the lower lever arm is also supported under the cup 4 by its upper face perpendicular to its front end In addition, the rocking latch 12 is blocked under the cup 4 by the key 17, whose oblique wall 18 has bears against the front face of the latch 12 opposite the front end of the lower lever arm 12a and defining the right angle with the latter Thus, even before the hammer or the hammer is completely hammered the key 17 in the assembly head 9, the latch 12 and the key 17 cooperate to prevent any disengagement of the hook member 11 of the cup 4 including

  by accidental lifting of the crossbar 1.

  When the key 17 is hammered into the head 9, the front ends of the head branch 19 and the lower lever arm 12a are forced against the side wall of the upright 2 and the lower arm 12a is also in position. forced support under the cup 4 so that the hook member 11 exerts in reaction on the cup a radial tensile force now vigorously this body in the

cup 4.

  In the depressed position of the key 17, the head branch 19 thereof is partially housed in a groove-shaped housing 22 of the assembly head 9 machined in the plane of symmetry of the head 9 and the upper part of the the head branch 19 is located at the cross member 1, which allows to have a floor over the entire space between two pairs of opposite amounts interconnected by two

  sleepers in the same horizontal plane.

  As already explained above, the same device of the invention can be used both at the end of a horizontal crossbar at the end of a cross diagonally without it being necessary in the latter case to provide additional parts to the assembly head or modifications thereof to fix one end of the cross diagonally to the corresponding amount In addition, several horizontal or diagonal crosspieces can be attached at their ends to the same cup respectively by several devices according to the invention and each of these sleepers can be placed or removed on or cup 4 without interfering with the other sleepers It is possible to install a cross and lock by a corresponding amount being located at a distance relatively far from the upright since the key and the rocking latch make it possible, during the installation of this cross, the lock Automatic removal of the end of the crossbar before the final blocking hammer and only one person can perform the assembly and disassembly of sleepers without particular difficulty The structure of the device of the invention is such that the sleepers can be positioned at a position any angle on 3600 around the upright while having the possibility of providing on the cup indexes relative to angular values so as to facilitate the mounting of the sleepers to position at specific angles relative to other sleepers Finally, the cup could be replaced by a perforated disk allowing the passage of hook members respectively devices according to the invention

but the cup is preferable.

he

Claims (10)

R E V E N D I C A T IO N S   1 Device for assembling and fixing an end of a cross member (1) to a post (2), of the type comprising a recessed attachment piece (4) integral with the upright (2) coaxially thereto; an assembly head (9) of the crossmember (1) to the fastening part (4), fixed to the end of the crossmember (1) and comprising a hook member (11) engaging in the recessed part the fastener (4); and a locking or locking key (17) of the hook member (11) in the workpiece (4) passing through the assembly head (9), characterized in that it comprises a tilting latch (12) made of right angle bent lever form mounted in the assembly head (9) and the upper lever arm (12b) serves as a tilting control of the latch (12) by approximately contacting the outer edge of the fastener and the lower lever arm (12a) serves as a retaining element of the hook member (11) in the fastening part (4) by positioning itself under the latter.   2 Device according to claim 1, characterized in that, in position before assembly, the key (17) occupies an oblique inactive position with its lower end resting on the upper lever arm (12b) of the tilting latch (12). in order to lock the latter in an inactive position allowing the introduction of the hook member (11) in the workpiece (4) and, when the swinging bolt (12) is tilted towards its aforementioned active holding position, the key ( 17) automatically falls by gravity through the assembly head (9) to an active locking position of the rocking lock (12) at its active holding position at which the front end of the lower lever arm (12) a) is supported on the wall side of the upright (2).   3 Device according to claim 1 or 2, characterized in that the key (17) comprises a head branch (19) substantially perpendicular to its longitudinal portion (18) and bearing on the side wall of the upright (2) to the active position of locking of the rocking lock (12).   4 Device according to claims 1 to 3,   characterized in that, after hammering the key (17), the longitudinal portion of the key exerts on the assembly head (9) a force such as the head leg (19) of the key, the end front of the lower lever arm (12a) of the rocking bolt (12) are forced against the side wall of the upright (2) and the lower lever arm (12a) bears against the fixing part (4). ) so that the hook member (11) exerts in reaction on the fastener (4) a radial tensile force now vigorously maintaining the member (11) in the piece (4).   Device according to claims 1 to 4,   characterized in that the front end of the lower lever arm (12a) of the rocker lock (12) and the front end of the leg (19) of the key (17) are curved to fit the side wall tubular amount (2).   6 Device according to one of the claims   previous, characterized in that the key (17), the rocking latch (12) and the hook member (11) are disposed substantially in the same plane of symmetry   longitudinal center of the assembly head (9).   7 Device according to one of the claims   preceding, characterized in that the key (17) is   housed captively in the assembly head (9).   8 Device according to one of the claims   previous, characterized in that the aforementioned fastener is cup-shaped (4) open upwards comprising a frustoconical ring (5) diverging upwardly fixed to a central cylindrical core (7), integral with the upright (2) concentrically to the latter, by gussets or radial fins (6) of the same dimensions so as to form openings (8) between fins or gussets (6).   9 Device according to one of the claims   previous, characterized in that the rocking lock (12) is mounted in the assembly head (9) by pivoting about a pivot axis (13) fixed transversely to the assembly head (9) or by two lugs coaxial (14) integral on both sides of the rocker lock (12) and rotatably housed respectively in two bores   transverse members (15) of the assembly head (9).   Device according to claims 3 and 4,   characterized in that the head branch (19) of the key (17), in the depressed locking position, is housed at least partially in a groove (22) of the assembly head (9) located in the plane of symmetry of the head (9) and has its upper part located at the level of the crossbar (1).   11 Device according to claim 1, characterized in that the assembly head (9) is fixed to the end of the cross member (1) is rigidly, be articulated.   Scaffolding system comprising tubular uprights (2) and tubular crosspieces (1) horizontal or diagonally, characterized in that each crosspiece (1) has at its two ends an assembly and fixing device as defined in FIGS. Claims 1 to 11.