FR2700350A1 - Basic structure for rolling scaffolding. - Google Patents

Abstract

This supporting (base) structure (1) is designed to be surmounted by a vertical structure (2). It has an overall cross or "X"-shaped configuration, with one branch (7) and/or half-branches (12, 13) joined in an articulated way in the central region (8, 9) of the structure (1). The free ends of the branches (7) and/or half-branches (12, 13) are provided with legs (feet) (18) with wheels or castors (19). These ends further bear means (14, 15, 16, 17) for linking to the lower part of the vertical structure (2) of the mobile (rolling) scaffold (scaffolding).

Description

"Basic structure for rolling scaffolding" The present invention

concerns a structure of

base for rolling scaffolding.

  A rolling scaffold generally includes

  Lely known, a basic structure surmounted by a

vertical structure.

  The basic structure, in one-piece or modular construction, generally determines the horizontal dimensions

  tales of the vertical structure This basic structure10 includes wheels or casters facilitating mobility and movement on the ground of the rolling scaffolding Lateral stabilizers are sometimes integrated into such a

basic structure.

  The vertical structure or "tower", of horizontal section

  rectangular, adjustable in height and

  door access or work floors This vertical structure is composed of superimposed modules, each consisting of two vertical frames or opposite ladders,

  connected to each other by diagonals or cross bars.

  The scales generally correspond to the short sides of

  the rectangular horizontal section, while the diameters

  gonales correspond to the long sides of this rectangular section It is essentially a

tubular structure.

  Stabilizers, fixed to the corners of the tubular structure, are also provided to ensure the

scaffolding stability.

  In such a rolling scaffold, the invention is more particularly interested in the basic structure, which must provide the following functions:

  The basic structure generally fixes the dimensions

  sions of the rectangular horizontal section of the

vertical structure.

  It includes wheeled or wheeled devices.

  lettes necessary for moving the scaffolding.

  It provides the necessary rigidity at the base of the scaffolding, and therefore contributes to the rigidity

overall scaffolding.

  It includes the means allowing the fixing, on this basic structure, of the lower ends

  scales of the first module of the vertical structure.

  To constitute such a basic structure, one

  currently knows various embodiments.

  A first known construction method consists in making a foldable system, mainly composed of a horizontal rectangular frame fixing the dimensions of the section of the vertical structure, and two scales

  articulated respectively at the two ends of the frame.

  In the transport position, the two ladders are folded against the horizontal frame so as to form a

  as compact as possible In the position of use

  tion, the two scales are arranged vertically, their spacing being maintained by the horizontal frame and the rigidity of the assembly being ensured by diagonals

  mounted between the horizontal frame and the vertical ladders

  In general, these scales are specific to the basic structure, and they include laterally

  small integrated stabilizers, fitted with wheels.

  These first basic structures generally provide

  ral a good rigidity, but they are of a complex realization, therefore of a high cost In addition, they

  remain bulky, heavy and very difficult to handle

  tempt by a single person In addition, they fix

  invariably the dimensions of the hori-

  rectangular zontal vertical structure of the sample

  , which requires a basic structure

  specific for each dimension of scaffolding.

  A second technique, currently used to constitute a modular base structure, consists in having, under each lower scale of the vertical structure, one or more tubular crosspieces equipped with

  means of fixing this ladder These crosspieces

  tent generally incorporated stabilizers The two crosspieces are connected to each other by longitudinal beams, in order to provide the necessary rigidity to the base structure, and to fix the dimensions of the horizontal section of the vertical structure This arrangement requires still, in general, the addition of a horizontal diagonal The basic structure then comprises: two crosspieces supporting the scales, and forming the short sides of a rectangle two beams forming the long sides of the rectangle a diagonal connecting two

vertices of this rectangle.

  Such a modular system therefore requires five parts to constitute a basic structure of given dimensions, and it turns out to be impractical. In particular, this basic structure is difficult to handle, and requires at least two people and tools to be reconstituted on the ground, the assembly of its elements being the source of a waste of time In addition, to be able to adapt such a basic structure to vertical structures of various dimensions, it is necessary to have at least other pairs of beams constituting the long sides of the rectangle. A third known technique, the application of which 2.5 remains mainly limited to aluminum scaffolding, consists in connecting the lower scales of the vertical structure by two horizontal beams and by a horizontal diagonal. Feet provided with wheels are put in place. directly in the tubular uprights of the ladders, and the stabilizers are hooked on the tubular uprights of the ladders This last type of basic structure remains complex to assemble, it generally requires two people for its installation, and it remains at a cost The invention aims to remedy the drawbacks which have just been explained, and it thus aims to provide a basic structure for rolling scaffolding which is light, therefore economical, easy to handle and to set up by a single person, and easily adaptable to vertical structures of various dimensions, while being foldable under a small space briefly. To this end, the invention essentially relates to a basic structure for rolling scaffolding, which has a general configuration in cross or "X" shape, with arms and / or half-arms joined together in an articulated manner

  in the central region of the structure, the four extremes

  respective free mites of the arms and / or half-arms being provided with feet on wheels or casters, and means of

  connection with the lower part of the vertical structure

rolling scaffold block.

  Thus the invention is based on the idea of making a basic structure on the concept of a cross (or an "X"), this cross arranged in a horizontal plane in use being articulated at its center La

  cross is achievable, in a particular form of execution

  lière, by means of an arm in the central part of which are articulated, around parallel and vertical axes in use, the ends of two half-arms whose length is substantially equal to half the

  arm length, the two half-arms being located respectively

  on either side of the arm According to another pos-

  sibility, the cross structure results from four half

  arms of equal length, all articulated by one end,

  around parallel and vertical axes in use

  tion, on the same central element.

  In all cases, the free ends of the arms and / or half-arms are advantageously provided with respective sleeves, vertical in use, which are provided for fitting the lower ends of the tubular uprights of the ladders belonging to the

vertical structure.

  It is enough to adjust the opening angle of the cross structure in its center to adapt, at each end of this structure, the spacing of the sleeves to the width of the scales. In addition, the fact of increasing the opening of the cross structure is necessarily accompanied by a reduction in its length, which makes it possible to reduce the length of the scaffolding floors when using larger scales. Thus, the basic structure object of the invention allows scaffolding of at least two dimensions (as regards their rectangular horizontal section), this

  with one and the same basic structure.

  In addition, the vertical sleeves attached to the ends

  free tees of the arms and / or half-arms of the basic cross structure allow not only to receive the

  amounts of ladders, nested in their upper end

  but also to receive the feet along their axis

  on wheels or casters, which make the scaffolding rolling.

  The vertical forces, due to the loads carried by the floors of the scaffolding are thus directly transmitted towards the ground, without generating other undesirable forces,

  especially in the basic structure.

  Preferably, the vertical sleeves provided at the free ends of the arms and / or half-arms each carry a nut into which is screwed a threaded rod with a vertical axis, belonging to the corresponding wheel or wheel foot The nut, set in the sleeve, serves as

  low stop at the ladder upright introduced in the man-

  chon, and it allows the vertical adjustment of the foot, ensuring

  the contact of the wheel or caster with the ground.

  In addition to the advantages outlined above, the

  basic cross structure can be easily implemented

  LEMENT ON THE GROUND BY A SINGLE PERSON The basic structure being initially folded, it is enough to unfold it by spreading its arms and / or half-arms, then the spacing of

  these arms or half-arms are fixed by fitting the ladders.

  In addition, in the folded state, the basic structure occupies a

  reduced volume, while being easy to handle on the ground, this folded structure remaining stable and still able to roll on its four feet on wheels or casters.

  In any case, the invention will be better understood, and other characteristics will be highlighted in

  using the following description, with reference to the drawing

  attached schematic showing, by way of nonlimiting example, some embodiments of this basic structure for rolling scaffolding: Figure 1 is a perspective view showing a basic structure according to the present invention, used in a rolling scaffolding; Figure 2 shows the basic structure of Figure 1 alone, in perspective, in the unfolded state; Figure 3 is a perspective view of the basic structure of Figures 1 and 2, in the folded state; Figure 4 is a perspective view showing another basic structure according to the invention, used in a rolling scaffold; Figure 5 shows the basic structure of Figure 4 alone, in perspective, in the unfolded state; Figure 6 is a perspective view, on an enlarged scale, of the central element of the basic structure of Figures 4 and 5; Figure 7 is a partial view illustrating a device for locking a ladder to the base structure; Figure 8 is a partial sectional view of the base structure and one of its wheeled legs; Figure 9 is an exploded perspective view of one of the wheeled feet equipping this basic structure, in a variant;

  Figure 10 is an enlarged view of the arrangement

  wheel retention device in Figure 9.

  Figure 1 shows a rolling scaffold, with

  a basic structure 1 surmounted by a vertical structure

  wedge 2, partially shown The vertical structure 2 comprises, in a known manner, superimposed modules each consisting of two opposite ladders 3, with vertical tubular uprights 4 interconnected by horizontal crosspieces or steps 5 The two scales 3 are connected to each other by diagonals 6 The vertical structure 2 supports access or work floors, not shown, which are not affected by the

present invention.

  Basic structure 1 has a configuration

  general cross or "X", a first embodiment

  tion of this structure 1 being shown in FIGS. 1 to 3.

  The basic structure 1 here comprises a tubular arm

  strip 7, of rectangular section In the middle region of the arm 7, respectively on the upper and lower faces of this arm 7, are fixed by welding two superimposed plates 8 and 9 The two plates 8 and 9 are drilled correspondingly at 10 and 11, and thus allow articulation, around respective vertical axes,

  of two tubular half-arms 12 and 13 of rectangular section

  laire Directed in opposite directions, the two half-arms 12 and 13 are located, respectively, on either side of the arm 7, their length being equal to half that

arm 7.

  At both ends of arm 7, and at the ends

  free of the two half-arms 12 and 13, are welded respectively

  four vertical sleeves 14,15,16 and 17 The sleeves

  chons 14 to 17 are provided to receive, in the position of use, the lower ends of the tubular uprights 4 of the ladders 3 belonging to the first module of the vertical structure 2 These sleeves 14 to 17 are also crossed, in a manner described in detail lower,

  by four respective feet 18, provided with wheels 19.

  As shown more particularly in Figures 1 and 2, the basic structure 1 is unfolded for its use, the two half-arms 12 and 13 being separated from the arm 7 so that the distance D separating the two sleeves 14 and 16 d on the one hand, and the distance separating the two sleeves 15 and 17 on the other hand, is equal to the horizontal spacing of the two uprights 4 of a scale 3 As can easily be understood, these distances D between

  sleeves are modifiable thanks to the articulation of the half

  arms 12 and 13, and the same basic structure 1 can thus be adapted to various dimensions of the horizontal section of the vertical structure 2 Once put in place, the ladders 3 fix and maintain the spacing between the

half-arm 12 and 13 and arm 7.

  When the basic structure 1 is not used, that is to say when the vertical structure 2 is removed, the two half-arms 12 and 13 can be folded against the arm 7, as shown in FIG. 3. sleeves 14 and 17 are thus closely spaced, as are the sleeves

  15 and 16, and the basic structure 1 then occupies a minimum space requirement.

  Figures 4 to 6 show another basic structure 1, still shaped like a cross or "X", but composed

  of four half-arms of the same length 20, 21, 22 and 23.25 The four half-arms 20 to 23, of tubular conformation, are all articulated around vertical axes on the same central element 24, more particularly visible in the figure 6 The central element 24 consists of two superimposed coaxial discs 25 and 26, rigidly connected to each other by a sleeve 27 The two discs 25 and

  26 have holes 28 corresponding which define-

  feels the axes of articulation of the four half-arms 20 to 23.

  Vertical sleeves 14, 15, 16 and 17 are welded to the respective free ends of the four half-arms

20,21,22 and 23.

  In the unfolded position, as shown in the figures

  4 and 5, the half arms 20 to 23 are held at a distance

  predetermined ment, by means of removable pins 29 The lower ends of the uprights 4 of the ladders 3 are fitted into the sleeves 14 and 17, as before,

  when the vertical structure 2 is put in place.

  When this vertical structure 2 is removed, the half-arms 20 to 23 can be brought together two by two, to bring the basic structure 1 into a space requirement

very weak.

  Note that in the unfolded state, the basic structure

  1 cross or "X" can accommodate a rectangular tray

  laire 30 (figure 4) We thus easily have a means of storage and transport of material, such as ladders and braces, necessary for the construction or the use of the rolling scaffolding Of course, the installation such a plate 30 is also possible in the case of the first embodiment (Figures 1 to 3).

  Referring now to Figures 7 and 8, which can be applied to either of the embodiments.

  sation above, we will still describe the detail of the connection between a tubular upright 4 of a scale 3 and the basic structure 1, as well as the detail of a foot 18 to 25 wheel 19.

  The tubular upright 4 of the scale 3 is of

  outer diameter smaller than the inner diameter of the man-

chon 16 in which it is engaged.

  A nut 31 with vertical axis thread is fixed to the lower part of this sleeve 16 The foot 18, with screw, comprises a threaded rod with vertical axis 32 at the lower end of which a yoke 33 is provided for the wheel pivoting 19 The threaded rod 32 is screwed into

  the nut 31 and extends upwards along the axis of the man-

chon 16.

  In order to ensure the stability of the scaffolding, the ladder 3 belonging to the vertical structure 2 must be positively connected to the basic structure 1, here in cross This connection cannot be ensured by a pin passing through the sleeve 16 and the amount 4, because it blocks-

  rait the threaded rod 32 of the foot 18.

  According to Figures 7 and 8, this difficulty is

  resolved by providing a simple blocking device, comprising

  taking a yoke consisting of two flat irons 34, verti-

  wedges and parallels, welded laterally against the sleeve 16 This yoke, facing upwards, has a pair of holes in which can be engaged horizontally

a pin 35.

  When the upright 4 of the ladder 3 is engaged in the sleeve 16, the lower rung 5 of the ladder 3 is housed between the two flat bars 34 of the yoke

  above The installation of the pin 35, passing over

  above the lower rung 5, ensures the locking of

this step 5 in the yoke.

  We understand that this device does not

  obstacle to the passage of the threaded rod 32 and to the movement

  axial of the latter, necessary to adjust the height

wheel 19.

  Naturally, the arrangements described and illustrated here for a sleeve 16 and a foot 18 are also provided for on the other sleeves 14, 15 and 17, corresponding to the other feet 18. The non-representation of the feet in certain figures only responds to a concern for clarity. and for simplification, these feet being able to remain in place on the basic structure 1 even when the latter is in the folded state. Finally, as shown in FIGS. 9 and 10, it turns out to be advantageous to equip the basic structure 1 in a cross or "X" shape with screw feet 18 each equipped with a

  wheel 19 and a standard nut 31 screwed onto the threaded rod 32 with a vertical axis.

  it is however necessary here to maintain each screw base 18 in the corresponding sleeve 16 of the basic structure 1, in particular when this structure

  For this purpose, the use of the basic

  tion of an oblong retaining ring 36, of flat configuration and of thickness such that parts of this ring 36 can engage in the threads of the threaded rod

  32, as illustrated more particularly in FIG. 10.

  The ring 36 has two zones, one narrower 37, adapted to the diameter of the bottom of the threads of the threaded rod 32, and the other 38 wider allowing the free passage of the threaded rod 32 The sleeve 16 has two

  horizontal slots 39, diametrically opposite, which main-

  hold and guide the ring 36, while allowing it

  reach the portion of threaded rod 32 located inside

muffler 16.

  Thus, by a horizontal sliding movement of the oblong ring 36, between two extreme positions, the zone 37 is engaged on the threaded rod 32 to retain the foot 18, or the other zone 38 is engaged around this threaded rod 32 so as to release it The internal width of the zone 38 is such that it makes it possible to engage the ring 36 around the sleeve 16, this at the time of the initial assembly. The oblong ring 36 comprises an insert, projecting into the zone 38 and defining a longitudinal guide slot, in which is engaged a rivet or a stud 41 protruding from the upper face of the half-arm 12 near the sleeve 16 or , as appropriate, the upper face of the arm of the base structure 1 in a cross or "X" shape The rivet 41, sliding relative to the

  slot of the element 40, makes the ring 36 captive.

  It goes without saying that the invention is not limited to the sole embodiments of this basic structure for rolling scaffolding which have been described above, by way of examples; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle. It is thus, in particular, that one would not depart from the scope of the invention by modifications relating to the section given to the arms and / or half-arms of the cross or "XII" structure, or on the details of the articulations of the half-arms, or on the means of

  connection between the lower part of the vertical structure

wedge and basic structure.

Claims (6)

  1 Basic structure (1) for rolling scaffolding designed to be surmounted by a vertical structure (2), characterized in that it has a general configuration in cross or "X", with arms (7) and / or half - arms (12,13; 20,21,22,23) joined in an articulated manner in the central region (8,9; 24) of the structure, the four respective free ends of the arms (7) and / or half-arm (12,13; 20,21,22,23) being provided with feet (18) with wheels or castors (19), and means of connection (14,15,16,17; 34,35) with the lower part of the vertical structure (2) of the rolling scaffolding.   2 basic structure for rolling scaffolding according to claim 1, characterized in that this basic structure (1) in a cross or "X" shape comprises an arm (7) in the central part (8, 9) of which are articulated,   around parallel and vertical axes in use position   sation, the ends of two half-arms (12,13) whose length is substantially equal to half the length   of the arm (7), the two half-arms (12,13) being located respectively on either side of the arm (7).   3 basic structure for rolling scaffolding according to claim 1, characterized in that this basic structure (1) in cross or "X" comprises four half-arms (20,21,22,23) of equal length, all articulated by one end, around parallel and vertical axes in use, on the same central element (24). 4 Basic structure for rolling scaffolding   according to any one of claims 1 to 3, character-   risée in that the free ends of the arms (7) and / or half-arms (12,13; 20,21,22,23) are provided with sleeves   respective (14,15,16,17), vertical in use, which are intended for the interlocking of the lower ends of tubular uprights (4) of the ladders (3) 35 belonging to the vertical structure (2) of the rolling scaffolding.   Basic structure for rolling scaffolding   according to claim 4, characterized in that the man-   vertical chons (14,15,16,17) provided at the free ends of the arms (7) and / or half-arms (12,13; 20,21,22,23) each carry a nut (31) in which is screwed a threaded rod (32) of vertical axis, belonging to the foot (18)   with corresponding wheel or caster (19).   6 basic structure for rolling scaffolding according to claim 4 or 5, characterized in that the means of connection of this basic structure (1) with the   lower part of the vertical structure (2) comprising   still nent, for each vertical sleeve (14,15,16,17), a locking device consisting of a yoke (34) fixed against this sleeve and turned upward, which   receives the lower rung (5) of the scale (3), a gou-   plunder (35) passing over this rung (5) being placed in place on the yoke (34).   7 basic structure for rolling scaffolding according to claim 4, characterized in that there is provided, for each foot (18) wheel or roller (19) with threaded rod (32) of vertical axis, an oblong retaining ring (36) mounted to slide horizontally in slots (39) which have the corresponding sleeve (16),   the ring (36) comprising a narrower zone (37) adapted   tee to the diameter of the bottom of the threaded rod threads   (32), and a wider area (38) allowing free passage- of the threaded rod (36).   8 basic structure for rolling scaffolding according to claim 7, characterized in that the oblong ring (36) comprises an element (40) projecting in its widest area (38) and defining a longitudinal guide slot, in which is engaged a rivet or a stud (41) projecting from the upper face of an arm or half-arm (12) of the base structure (1) in a cross or in "X".