FR2782677A1 - Raisable door for load motor vehicle has drop guard mounted in rail on same side as lock keeper for access - Google Patents

Abstract

The lifting door (5) shutter has guide rails (10) with a keeper plate (60) accessible from the rail interior corresponding to the side on which a drop guard (30) is mounted. The latter has a bolt (32) inside the corresponding rail. The claims include a vehicle using the door

Description

The present invention relates to a hinged door system comprising

  a door and side rails for guiding the door between an open position and a closed position, the door itself comprising rigid boards hinged together and guide members cooperating with the side rails, the door system further comprising at least one

  parachute device mounted on one side of the door.

  The invention applies more particularly to a sectional door system fitted to a wall of a loading box of a vehicle

truck transport.

  Such a sectional door generally consists of planks which pass from a generally vertical plane of closure to a plane

  generally horizontal opening when handling the door.

  The door opening and closing operations can be manual or motorized. Generally, one or more maneuvering winch (s) whose cable (s) is or are connected to the lower board

  of the door, ensures (s) the opening of the door by pulling.

  When closing, the cable (s) of the winch (s)

  opens or retains the door by limiting its closing speed.

  A parachute device is a safety device allowing the door to be closed in the event of a break in the cable (s) of the or

opening winch (s).

  Such a parachute device makes it possible to limit the risks of injury that an untimely closing of such a door could cause. A type of parachute device is known which comprises an arm rotatably mounted by one of its ends on a lateral side of the door, and carrying at the other of its ends a blade. This arm is connected to a winch cable and includes a spring which is compressed when the winch cable is stretched. If the cable breaks, the arm pivots under the action of the spring

  by bringing the blade against the outside surface of the corresponding side rail.

  For this type of parachute device to be effective, the force of application of the blade on the outside of the rail must be large enough for the blade to bite into the rail. The length of the arm should be

  relatively large consequence for providing a large lever arm.

  Consequently, such a parachute device has a relatively large bulk with in particular parts, including the arm, which are largely prominent relative to the surface of the door and located at

  inside the loading space that the door must close.

  Such space is particularly troublesome for road transport vehicles in which it is sought to optimize the volume.

of the loading box.

  The invention aims to solve these problems by providing a lifting door system with improved parachute device, simple, efficient and whose size is limited in particular inside the volume

loading.

  To this end, the subject of the invention is a liftable door system comprising a door and side rails for guiding the door between an open position and a closed position, the door itself comprising guide members cooperating with the side rails, the door system further comprising at least one parachute device mounted on one side of the door, characterized in that it comprises at least one keeper accessible from inside the rail corresponding to the mounting side of the parachute device, and in that that said parachute device comprises a lateral bolt, disposed inside the corresponding lateral rail, and movable between a retracted position and an active locking position in which a bearing end of the bolt is advanced to insert into said strike or a

said wastes.

  According to particular embodiments, the liftable door system can comprise one or more of the following characteristics, taken in isolation or according to all technically possible combinations: the system comprises means for operating the door comprising at least one link, intended to retain the door when it is closed, and connected to the door by means of the parachute device so that a tension of the link biases the latch towards its retracted position, and the parachute device also comprises elastic return means from the bolt to its active position; - the bolt is articulated relative to the door to pivot between its retracted position and its active position; - The system includes means for limiting the movement of the bolt at its active position against the action of elastic return means; - Said means for limiting the movement of the bolt comprise means forming a stop integral with the bolt and intended to bear on said corresponding lateral rail when the bolt is in the active position; - The parachute device comprises a support mounted on the door and on which the bolt is articulated, the parachute device further comprising a member for returning said link carried by the support, a first and a second arm integral in rotation with the bolt, and said link is fixed to the first arm after passing over the return member, and the elastic return means bear on the second arm; The support end of the bolt comprises a support surface of profile adapted to come to be applied orthogonally against a retaining surface of said strike or one of said strikes; - Said or each keeper is formed by a recess formed in said corresponding side rail; and - the system includes several keepers spaced from each other

  along said corresponding side rail.

  2 5 The invention also relates to a road transport vehicle comprising a loading box, characterized in that at least one

  body wall is provided with a door system as defined above.

  The invention will be better understood on reading the description which

  will follow, given only by way of example, and made with reference to the accompanying drawings, in which: - Figure 1 is a schematic perspective view with cutaway of a road transport vehicle according to the invention, - Figure 2 is an enlarged and perspective schematic view, with parts broken away, of the vehicle parachute device of FIG. 1, - FIG. 3 is a schematic view, on a smaller scale, taken along arrow III of FIG. 2, and illustrating the parachute device, and - Figures 4 and 5 are schematic sectional views taken along line IV-IV of Figure 2, illustrating the operation of the device

parachute of figure 2.

  FIG. 1 illustrates a road transport vehicle 1 comprising a loading box 2, the rear wall 3 of which is provided with a system

lift door 4.

  In all that follows the terms "front" and "rear" are understood to mean

  relative to the orientation of the body 2 in FIG. 1.

  This system 4 comprises a door 5 and means 6 for

door operation 5.

  This door 5 consists of profiled boards 7 whose longitudinal axes are arranged horizontally. The boards 7 are articulated to each other by hinges 8, one of which is visible in FIGS. 4 and 5. The boards 7 are provided at their ends with guide members such as rollers 9 (FIG. 2) engaged in guide rails

  integral with the body 2 and arranged on each side of the door 5.

  The rails 10 each have a substantially vertical rectilinear section 11, disposed along the vertical uprights of the end of the body 2 and defining the closed position of the door. Each section 11 is extended in its upper part by a curved section 12, allowing each rail 10 to end under the roof 13 of the body 2 by a section

overall horizontal 14.

  As illustrated in FIG. 2, each rail 10 is formed by a section profile substantially in C, open towards the door 5 and with a flat base. Thus, each rail 10 has a part 15 of curved section, located inside the body 2, and a part 16 of straight section located outside of the body 2. The rollers 9 are intended to roll on these parts

  and 16. Of course, rails 10 of different section can be used.

  The means 6 for operating the door 5 comprise, fixed to the side walls 17 of the body 2 on each side of the door 5, a winch

  18 and a device 19 for elastic return of the door 5.

  As can be seen for the left side of the body 2 thanks to the cutouts in FIG. 1, each winch 18 is arranged above the curved section 12 of the corresponding rail 10. Each winch 18 is connected to a

  electric drive motor controllable and not shown.

  Each winch 18 comprises a winding drum not shown and a strap 20 connected to this winding drum and to the first board or bottom board 21 of the door 5. The straps 20 thus extend vertically on each side of the door. 5 and are masked by vertical panels 22 secured to the end posts of the

box 2.

  Each return device 19 is arranged under the junction between the substantially horizontal section 14 and the curved section 12 of the corresponding rail 10. Each return device 19 comprises a reel provided with a spiral return spring (not shown). A cable 24 is wound on this drum and is fixed to the last board or top board 25 of the door 5. Thus the two cables 24 extend on each side of the door 5 the

along the side walls 17.

  The door system 4 further comprises an essentially metallic parachute device attached to the left side of the first board

21 of door 5.

  This device 30 essentially comprises a support 31, a bolt 32 rotatably mounted on the support 31 by means of a shaft 33, and

  two levers 34 and 35 integral with the shaft 33.

  The support 31 is housed in a cavity 36 formed on the left side of the first board 21. This cavity 36 opens into the rear or external face 37 of the board 21, and into the left edge 38 of the

plate 21.

  The support 31 comprises a plate 39, fixed, for example by screwing, on the front or internal face 40 of the board 21 located inside

  of the body 2, two vertical wings 41 at the end, and a central wing 42.

  The wings 41 and 42 are substantially orthogonal to the plate 39.

  The shaft 33 is rotatably mounted on the wings 41 and 42, and extends substantially orthogonally to the latter. The left end 43 of the shaft 33 protrudes

  from the left wing 41 inside the left rail 10.

  The lever 34 comprises two flanges 45 integral with the shaft 33 and orthogonal to the latter, and a rod 46. The flanges 45 are arranged between

  the left wing 41 and the central wing 42.

  The flanges 45 extend on either side of the shaft 33 each forming two arms 47 and 48. The rod 46 is fixed to the upper arms 47 of the flanges 45 and extends between them substantially parallel to

tree 33.

  A deflection roller 49 is mounted parallel to the rod 46 between the left wing 41 and the central wing 42. This roller 49 is disposed at the rear, or

  more on the outside, and at a higher level with respect to the rod 46.

  The left strap 20 bypasses the rear, or outer, and lower part of the deflection roller 49 then advances towards the rod 46 to which it is fixed by forming a loop. The upper part of

  this loop is not shown in FIG. 3.

  As seen in Figure 1, the right strap 20 is attached to the lower board 21, at a level slightly lower than that of the parachute device 30 and therefore that of the rod 46, by means of two flanges enclosing a rod around which the right strap 20 forms

a loop.

  The lever 35 comprises two lateral flanges 51 and a central plate 52. These lateral flanges 51 are arranged between the right wing 41 and

  the central wing 42 of the support 31, and they are fixed and orthogonal to the shaft 33.

  The central plate 52 extends on either side of the shaft 33, at the rear of the latter, forming two arms 53 and 54. A spring 55 in a helix is wound around the shaft 33, between the two flanges 51. The ends of this spring bear on the one hand on the lower arm 54 of the plate

  52 and on the other hand on the plate 39 of the support 31.

  The bolt 32 is constituted by an elongated substantially rectangular plate fixed to the end 43 of the shaft 33. The bolt 32 is substantially orthogonal to the shaft 33 and has an upper end 56. A V-shaped notch 57 is formed at the the lower end 58 of the bolt 32. Thus, the bolt 32 has a substantially flat bearing surface 59 formed by the rear branch of said V-shaped notch 57. The bolt 32 is movable between a retracted position (FIGS. 2 to 4), in which its axis AA is substantially vertical and parallel to the plane of the plate 39 of the support 31, and an active position (Figure 5), in which the axis AA of the bolt 32 is inclined relative to the vertical, the end 58 of the bolt

  being advanced towards the outside or the rear of the body 2.

  A traction directed towards the rear of the body 2 and exerted on the rod 46 tends to return the bolt 32 to its retracted position. The pivoting of the bolt 32 towards its retracted position is limited at this position

  by pressing the upper arms 47 of the lever 34 on the roller 49 (Figure 3).

  A thrust directed towards the rear of the body 2 and exerted on the arm 54 of the central plate 52 tends to bring the bolt 32 into its active position. Furthermore, rectangular openings 60 forming strikes are formed in the right-hand section 16 of the left rail 10. These openings 60, only one of which is shown in Figures 2, 4 and 5, are elongated vertically, and arranged regularly one above the other in a spaced manner. Each opening or keeper 60 is delimited in

  part by a flat and substantially horizontal bottom surface 61.

  As long as the left strap 20 is tight, that is to say

  normal operation, it pulls the rod 46 towards the rear of the body 2.

  The bolt 32 is then in its retracted position, thus allowing the closing and opening of the door as described below, and the spring 55 is compressed. When the door 5 is in its closed position, its opening is ensured by the winches 18 which pull the board 21 upwards and, consequently,

  move the door 5 along the rails 10.

  When the last board 25 is engaged on the sections 14, which are substantially horizontal, it begins to pull the cables 24 towards the front of the body 2, thus unwinding them from the return devices 19 and putting the springs of the latter progressively in place. charge. The return devices 19 then exert a return force on the last board 25 directed towards the rear of the body 2 and dependent on the number of boards 7 engaged on the sections 14 of the rails 10. When the door 5 is in its open position , the latter is blocked, for example by the reduction systems of the electric motors driving the winches 18. Indeed, these reduction systems can be irreversible and thus oppose the action

  the restoring force of the devices 19.

  When it is desired to carry out the operation of closing the door 5, the blocking of the latter is released, for example by a reverse rotation of the electric motors for driving the winches 18 thus causing the straps 21 to unwind. The force of return exercised by the return device 19 pulls the board 25 towards the rear of the body 2 while keeping the straps 20 in tension by means of the board 21 as they unfold, and brings back the door 5 towards its closed position. The straps 20 have a retaining function for the door 5 and in particular limit

its closing speed.

  The restoring force exerted by the devices 19 becomes almost zero when the last board 25 leaves the horizontal sections 14, the end of the door 5 closing operation is then ensured by its

inertia and by its own weight.

  If the left strap 20 breaks while the door 5 is not in the closed position, the spring 55 of the parachute device 30 tends to return by

  By means of the lever 35 and of the shaft 33 the bolt 32 towards its active position.

  If a keeper 60 is present at the lower end 58 of the bolt,

  it engages in this waste 60.

  Otherwise, and if a closing movement of the door is triggered, under the effect of the return devices 19 or the self-weight of the door 5, for example if the two straps 20 are broken, then the end 58 of the bolt 32 enters the first keeper 60 which presents itself

at this end 58.

  Thus in each of these cases, if a closing movement of the door 5 appears, the bearing surface 59 of the bolt 32 comes to bear orthogonally on the lower surface 61 of a keeper 60. The bearing surfaces 59 and retainer 61 are then both substantially horizontal. Simultaneously, the upper end 56 of the bolt 32 bears on the part 15 of curved section of the left rail 10 by limiting the

  rotation of the bolt 32 to its active position against the action of the spring 55.

  Thus, the descent of the door 5 to its closed position in the event of rupture of the left strap 20 is limited to a maximum of approximately the distance

  separating two successive keepers 60.

  The risk of injury to a person by inadvertent closing of the door 5 is therefore limited. In addition, the parachute device is simple and inexpensive. Furthermore, the use of a bolt 32 housed in a guide rail 10 and intended to cooperate positively with strikes 60 allows the parachute device 30 to be efficient and of limited total size, so that its support 31 is housed almost entirely in the thickness of the board 21 of the door 5 and the device 30 has a

  zero bulk inside the box 2.

  In a variant not shown, the support 31 does not have a central wing 42, the roller 49 then being carried by the two wings

end 41 of support 31.

  More generally, a parachute device 30 can be fixed on each side of the door 5 and the support 31 of each device 30 can be hidden by a box fixed on the rear face 37 of the first board

  21, as shown diagrammatically in FIG. 1.

  Furthermore, the vehicle 1 may only be equipped with a single winch 18

  and / or a single device 19 for elastic return of the door 5.

Claims (10)

  1. Lifting door system (4) comprising a door (5) and lateral rails (10) for guiding the door between an open position and a closed position, the door (5) itself comprising guide members ( 9) cooperating with the side rails (10), the door system further comprising at least one parachute device (30) mounted on one side of the door, characterized in that it comprises at least one keeper (60) accessible from the interior of the rail (10) corresponding to the mounting side of the parachute device (30), and in that said parachute device (30) comprises a lateral bolt (32), disposed inside the corresponding lateral rail, and movable between a retracted position and an active locking position in which a support end (58) of the bolt is advanced to fit into said keeper or one of said strikes (60).   2. System according to claim 1, characterized in that it comprises means (6) for operating the door comprising at least one link (20), intended to retain the door (5) when it is closed, and connected to the door (5) by means of the parachute device (30) so that a tension of the link (20) biases the bolt (32) towards its retracted position, and in that the parachute device also comprises elastic means (55) from   return of the bolt to its active position.   3. System according to claim 2, characterized in that the bolt (32) is articulated relative to the door (5) to pivot between its position retracted and its active position.   4. System according to claim 3, characterized in that it comprises means (56) for limiting the movement of the bolt (32) at its active position against the action of the elastic return means (55). 5. System according to claim 4, characterized in that said means for limiting the movement of the bolt comprise means (56) forming a stop integral with the bolt and intended to bear on said rail   corresponding side (10) when the bolt is in the active position.   6. System according to any one of claims 3 to 5,   characterized in that the parachute device (30) comprises a support (31) mounted on the door (5) and on which the bolt is articulated, the parachute device further comprising a member (49) for returning said link (20) carried by the support (31), a first (47) and a second (54) arm integral in rotation with the bolt, and in that said link (20) is fixed to the first arm (47) after passing over the return member (49), and in that the elastic means (55)   of recall take support on the second arm (54).   7. System according to any one of claims 1 to 6,   characterized in that the bearing end (58) of the bolt (32) comprises a bearing surface (59) of profile adapted to come to be applied orthogonally against a retaining surface (61) of said keeper or one of said strikes (60).   8. System according to any one of claims 1 to 7,   characterized in that said or each keeper (60) is formed by a   recess in said corresponding side rail (10).   9. System according to any one of claims 1 to 8,   characterized in that it comprises several keepers (60) spaced one of   the other along said corresponding side rail.   10. Road transport vehicle (1) comprising a loading box (2), characterized in that at least one wall (3) of the box (2)   is provided with a door system according to any one of claims 1 to 9.