FR2875838A1 - Spring box for vertically displaceable rolling shutter, has snap fastener blocking rotation of outer flange during breaking of spring whose curved end is enclosed by prongs in slits arranged in rims of inner flanges - Google Patents

Abstract

The spring box has an outer flange (2) rotating with respect to a fixed shaft, and a spiral spring compensating weights of a rolling shutter using the flange. A snap fastener cooperates with a notch of a notched wheel (7) and blocks the rotation of the outer flange during breaking of the spring. A curved end of the spring is enclosed by prongs (23, 24) in slits (21, 22) arranged in rims of an inner flange (19). Independent claims are also included for the following: (A) a method for assembling a spring box of a fall prevention device for a vertically displaceable rolling shutter (B) a tool for assembling a spring box of a fall prevention device for a vertically displaceable rolling shutter.

Description

- 1 -

  FIELD OF THE INVENTION The present invention relates to a vertical motion fall arrest device spring box and its method of mounting.

  BACKGROUND OF THE INVENTION The technical field of the invention is that of the realization of a safety device and maneuvering a closure of the aforementioned type controlling the access of a garage, a shop, a garage or a garage. a warehouse, a bay etc ...

  The main purpose of the invention is to meet the criteria that must meet such safety devices, especially in the context of standards, especially European.

  The reference standard EN 12604 specifies that "vertically actuated hinged doors shall be equipped with fall protection both in normal operating conditions and in the event of failure of any of the suspension components or the balancing system "and that" in the event of a failure of the door suspension system, the main edge of the hinged door shall not move down more than 300 mm, even if rebound ".

  The envisaged failure is either the breaking or unloading of a cable, a chain, a ribbon, a belt, etc., of the curtain suspension, ie the breakage of a balancing spring ". These problems are known for a long time, and the mechanical solutions proposed are very numerous and varied.

  A large number of safety devices is based on the principle of the angular offset existing between a driving shaft - 2 - and a driven shaft connected by a return spring. This offset tends to cancel in case of reduction of the load or the driving force, or on the contrary to increase in case of overload. A non-nominal value of this angular offset triggers the shutdown of the system, its blocking or an alarm, whether by exclusively mechanical means, or electrical or electronic.

  US Pat. No. 2,878,865, for example, published on March 24, 1959, which US Steel Company owned, implements this principle and discloses a device for stopping the fall of a roller shutter in the event, in particular , breaking of the compensation spring. The locking element is a pawl associated with a ratchet wheel.

  Another such device is described in German Patent Application DE-2,532,604 published Jan. 27, 1977, in the name of P. Schemish. The failure of the drive system produces the counter-rotation of two wheels which has the effect of moving a strike towards a fixed stop.

  To meet more precisely the specifications of the standards mentioned above, various security systems have been developed recently by different manufacturers, while relying on mechanical principles well known in the technical field of reference.

  Patent Application FR-2.739.656 published April 11, 1997, in the name of G. Tournier, discloses a device for actuating a winding closure having a spring-loaded fall arrest system. The device comprises a fixed axis on which is mounted at least one coil provided with at least one spiral compensation spring. In a manner known per se, the inner end of the spring is integral with the fixed axis and its outer end is integral with the coil, the latter being itself coupled to the upper end of the apron making winding closure .

  In a manner also known per se, the safety device for stopping the fall of the apron in case of rupture of the spring is such that it makes it possible to couple the coil to the fixed axis - 3 - after an angular displacement of this coil relative to to the locking device, this movement being controlled by a return element mounted between the coil and this locking device. For this purpose, a winding flange secured to the upper part of the deck is coupled to the coil, enclosing and driven by the spiral spring, with a finger secured to the coil and passing through the flange to move a movable element between a standby position in normal operation and a locking position with a notched wheel secured to the fixed axis, the finger remaining still engaged in the mobile device.

  A more original variant of the same device was the subject, by the same applicant, of the European patent application EP-0.768.445 published April 16, 1997. In this variant, the inner end of the compensation spring is also integral with the fixed axis, but integral with the locking member movable in rotation relative to the fixed axis.

  If these last two safety devices, based on the principle of the detection of the angular displacement of an intermediate element, actually meet the requirements such as those indicated in the standard above, they have the main disadvantage, once they have blocked the fall of the closing apron, to prevent, if it is not to be able to raise it, at least to lower it completely to close the opening concerned. When the failure of the closing system has occurred during operation, the deck is partially open or closed to complete the maneuver, it is then necessary to disassemble the winding system. This operation requires the intervention of specialized technicians who are not necessarily available at the time of the incident. The manager or the user of the local can not then close access to its premises and prevent unauthorized intrusion, which can be embarrassing when it comes to a business. In addition, the technicians must intervene while a large part of the deck pulls on the winding system and another part is still rolled, - 4 - while there is more compensation system and that the security lock system is inaccessible. Indeed, in the two devices above, the anti-fall is located inside the rolled apron: to access the security system in order to unlock, it is necessary to disassemble the entire system. It is a long and very complex work, which requires great caution, because elements of the system, being no longer supported, may escape the technicians.

  The French patent application FR-2,790,033 in the name of the applicant company, published on August 25, 2000, describes a fall arrest device with vertical displacement to overcome this disadvantage while meeting the requirements of standards such as those indicated above. case of rupture or failure of any of the elements of the carrier device (such as a compensation spring, but also the breaking or unloading of a cable, a chain, a strap etc ... depending on the type of suspension used).

  With the safety lock engaged and the apron or panel stopped in the half-closed or open position, it is possible: on the one hand to completely raise the latter without having to intervene on the winding system properly said, and therefore access and use its premises pending the troubleshooting technicians, and - on the other hand, manually lower the deck to put his local safe if technicians can not intervene in a reasonable time to avoid This vertical movement fall arrest device comprises in a known manner, both in the vertical panel closing devices and in the winch type drive systems, a fixed shaft, at the less a flange rotating relative to this shaft and whose rotation ensures the vertical displacement of the closure, and a means for compensation of the weight of the closure by action on this flask.

  In the embodiment described, this compensation means is constituted by a spiral spring, whose inner end is fixed on the fixed axis and the outer end is fixed to a bell which covers this outer end and a side wall. is constituted by the flange.

  The fall arrest device also comprises a toothed wheel secured to the shaft and a rocking lock rotated by the flange. The lock is adapted to cooperate with at least one notch of the toothed wheel and to block the rotation of the flange to prevent the free fall of the panel. Remarkably, the rocker lock further includes a finger, at least one side edge of the end is beveled along a plane secant with the casing cylinder of the toothed wheel, which finger is laterally movable relative thereto a race allowing him at least to escape the guts.

  Thus, although the closing apron is blocked in its descent by the rocking latch, it is possible to go up since, in this sense, the lock will fade notch after cran and, as soon as we release the weight of the apron , it will not be able to go down beyond the notch in which will immediately block the finger of the lock, its bevel not allowing its deletion only in the direction of the ascent.

  In addition, the toothed wheel of this device comprises at least two rings. The first comprises locking notches in rotation of the closure. The second, placed laterally with respect to the first in the direction of the lateral displacement of the finger, comprises at least one cam whose face against which the beveled lateral edge of the end of the finger rests is able to evade this. this completely from the notched wheel in the direction of the rise of the closure.

  The other face is able to bear the end of this finger. It is profiled along a slope bringing this end in front of a locking notch in the direction of the descent of the closure: the distance between two successive cam positions is at least equal to that separating two notches.

  Thus, thanks to the cams of this second ring and the bevel of the locking bolt finger, it is possible on the one hand to completely go up to the upper part, as mentioned above, the entire closing plate by erasing the finger the lock with its beveled side edge, and secondly to lower the deck step by step to a distance corresponding to the distance between two cams, the lock finger relocating each time in a notch of the wheel notched. It is sufficient that the distance between two successive cam positions is less than 300 mm to meet the standard indicated above.

  This fall arrest device with vertical displacement answers the problem posed and brings more specific technical solutions, which allow by

example:

  - To have the entire safety device outside the winding and compensation system of the closing apron, which allows an easier intervention, - to raise or lower the closing apron completely and to secure it in this position, thus eliminating any rotational force on the winding system, which simplifies the intervention of the breakdown technicians, - in the case of a spiral spring-type device, to avoid that when it breaks, come block the security system, which can occur when it is directly related to the compensation spring or the box that encloses it. Indeed, in case of breakage, the leaf spring suddenly relaxes and opens to the maximum by pressing against the outer wall of the box that encloses it, risking to prevent any relative rotational movement thereof by relationship to another body, such as security.

  This last risk seems to be the disadvantage of some very simplified fall arrest devices with spiral spring, where is only implemented the radial or tangential displacement of the free end of the spring at the time of rupture to directly control a mechanical part blocking.

  Examples of these simplified fall arrest systems, thus operating on a completely different principle from that of the present invention based on the angular displacement of an intermediate element, are described in particular in the French patent application FR-2 756 319 in the name of M. Javey, published on May 29, 1998, or French patent application FR2,793,837 in the name of France Fermetures, published on November 24, 2000.

  GENERAL DESCRIPTION OF THE INVENTION

  The present invention therefore aims to improve the operation of fall arrest devices vertically moving, satisfying both the standards in force and the needs of users, and mechanically the most sophisticated, known from the state of the art.

  To do this, the subject of the invention is a spring box specific to a fall arrest device for vertical rolling curtain, and its mounting method using a special key.

  The spring box is of the type of those in the general form of a cylinder having at least one lateral opening and comprising: at least one outer flange rotating with respect to a fixed shaft and whose rotation ensures the vertical displacement of the curtain a spiral spring for compensating the weight of the curtain by acting on the outer flange, the outer end of the spring being fixed inside the box on at least one inner flange adjacent to the outer flange by fixing means, and the inner end of the spring being intended to be fixed to the fixed shaft, - a notched wheel intended to be fixed on the fixed shaft, - 8 - - a tilting lock rotated by the outer flange, adapted to cooperate with at least one notch of the notched wheel and to block the rotation of the outer flange to prevent the curtain from falling down if the spring breaks. The rocking latch comprises a finger of which at least one lateral edge of the end is beveled along a plane secant with the casing cylinder of the toothed wheel. The finger is mounted laterally movable relative thereto following a race allowing at least to escape said notch.

  The spring box according to the invention is remarkable in that the fastening means of the outer end of the compensation spring are operative during and after the accidental breaking thereof.

  In a preferred embodiment of the spring box according to the invention, these fixing means comprise at least one cutout arranged in a ring integral with the periphery of the inner flange, and cooperating with the outer end of the compensation spring.

  Preferably, the edges of the cutout form at least one notch in which is engaged the outer end of the spring, and at least one tab now tangentially the outer end of the spring.

  This notch and this tab are preferably substantially rectangular, and preferably extend in a direction substantially parallel to the axis of the spring box.

  Advantageously, the spring box according to the invention comprises two exemplary vis-à-vis the inner flange, and two lugs each arranged in the ring of a flange, symmetrically with respect to the middle section of the box.

  Preferably, two copies of said notch are also arranged vis-a-vis in the ring of each inner flange so that the distance separating the bottoms of these notches is at least greater than the width of the compensation spring, and that the width of the notches is slightly greater than the thickness of the compensation spring. - 9 -

  According to an alternative embodiment of the spring box fall arrest device for rolling shutter vertical displacement according to the invention, the fixing means of the outer end of the compensation spring on the inner flange are constituted by at least one self-locking screw. tapping cooperating with corresponding holes arranged in the end of the spring and in the crown of the flange.

  Another object of the invention is a method of mounting the vertical motion roller shutter device spring box executed according to the preferred embodiment described above. This mounting method is of the type of those comprising several successive steps: a preliminary step consisting in selecting the number of turns, the length, the thickness and the width of the compensation spring, and in forming its outer end in a staple; first step of the spring to the fixed shaft, second step of securing - an inner - an outer end attaching the end of the spring on the or the inner flanges by means of this clip.

  The method according to the invention is remarkable in that it further comprises a first additional phase, performed after the previous step and before the first step, and a second additional phase, performed after the second step.

  It has indeed been found that these two additional phases of the assembly made it possible to reduce the response time of the fall arrest system in the event of spring breakage.

  However, they do not increase the assembly time because they are very simple, the first phase of placing each leg in a direction substantially perpendicular to the surface of the ring of the inner flange, and the second phase of replacing the leg substantially at the surface of this ring, so as to enclose the outer end of the spring in the notch thereof.

  The execution of these phases of the mounting of the spring box of the fall arrest device for vertical rolling curtain according to the invention is further facilitated by means of a special key.

  This tool comprises a first portion, forming a handle, connected by a bend to a second portion forming a fork, having a free end beveled on the side of the inside of the bend. A longitudinal slot open towards the free end extends along this second part in a plane perpendicular to that of the bend. This slot is of width and length respectively substantially greater than the thickness and the length of the tab to handle. The first and second parts of the tool form between them an angle substantially equal to 45, and the length of the second part is of the order of half the height of the box.

  These few essential specifications make obvious to the skilled person the advantages brought by this device compared to the state of the prior art.

  The detailed specifications of the invention are given in the following description in conjunction with the accompanying drawings. It should be noted that these drawings have no other purpose than to illustrate the text of the description and do not constitute in any way a limitation of the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

  FIGS. 1 and 2 are the front views of a spring box of a state-of-the-art vertical rolling shutter fall arrest device, respectively during normal operation of the system and after breaking of the compensation spring. .

  3 and 4 are the front views of the preferred embodiment of the vertical displacement rolling shutter device spring box according to the invention, respectively during normal operation of the system and after breaking of the compensating spring.

  FIGS. 5 and 6 are the front views of an alternative embodiment of the vertical movement rolling shutter device spring box according to the invention, respectively during a normal operation of the system and after the failure of the compensation spring.

  Figures 7a to 7c illustrate the mounting method of the preferred embodiment of the spring box. Figure 7a shows the spring box before the introduction of the compensation spring. Figure 7b shows the introduction of the spring in the box and its attachment to the fixed shaft by its inner end. Figure 7c shows the spring in place, its outer end staple then being retained on the flanges by tabs.

  Figures 8a to 8b are respectively the front view and the top view of a special key adapted to the mounting of the spring box according to the invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION As shown in FIGS. 1 and 2, representing a device of the state of the art, the fall arrest device for vertical displacement closure in question comprises a fixed shaft 1, at less an outer flange 2, rotating relative to the shaft 1 and whose rotation ensures the vertical displacement of a curtain 3, and a spring 4 of the compensation of the weight thereof by action on the flange 2. This spring 4 is spiral type wound on itself. Its inner end is fixed to the fixed shaft 1 and its outer end 5, folded on itself to form a staple, is fixed inside a spring box 6. The curtain 3 comprises an apron to parallel slats adapted to wind around the spring box 6 on which it is fixed by different staples.

  The fall arrest device also comprises, in a known manner, a notched wheel 7 integral with the shaft 1 and a rocking lock 8 rotated by the outer flange 2. This latch 8 is adapted to cooperate with at least one notch 9 of the notched wheel 7 and to block the rotation of the outer flange 2 to prevent the curtain 3 coming down.

  The rocking lock 8 comprises a finger 10 whose at least one lateral edge 11 of the end is beveled along a plane intersecting with the casing cylinder of said toothed wheel 7, which is of the same axis as the fixed shaft 1.

  The finger 10 is mounted laterally movable with respect to the toothed wheel 7 in a race allowing it at least to escape the notch 9, the secant plane being inclined of course in the direction of the lateral displacement of the lock 8, also cutting the support axis 12 thereof on the side where the lock 8 must escape the notch 9 relative to the wheel 7.

  Such a displacement of the finger 10 is allowed by the specific articulation that comprises said latch 8 around the support shaft 12 fixed on the outer flange 2, which articulation comprises a first orifice abutting against a shoulder of this axis 12 and a second oblong hole located on the same side as the side edge 11 beveled finger 10 blocking and able to ensure the lateral displacement thereof.

  This movement must allow the latch 8 to escape at least the notch 9 in which it would be blocked, for example following the break of the compensation spring 4, by pivoting the lock around the first orifice and perpendicularly to the support axis 12 .

  The latch 8 is in the form of "U", one side of the base forms the finger 10 with its beveled end and the wings of the "U" bear the hinge orifices, that corresponding to the oblong orifice being curved, for allow its pivoting by a washer fixed on the support shaft 12, and now the latch thereon; this same lateral wing of the "U" is also interrupted on the side of the finger 10 to allow the locking latch 8 to tilt towards the toothed wheel 7.

  Indeed, the finger 10 is pivotally mounted around said axis 12 between: - a waiting position shown in Figure 1, by pressing its end against a stop 13 secured to an inner flange 14 rotatable by relative to that 2 constituting in fact, in the embodiment described, a side wall of the spring box 6 ensuring the vertical displacement of the curtain, and intermediate with the compensation spring 4 to which the inner flange 14 is connected, - and a blocking position as shown in Figure 2 by pressing its end into one of the notches 9 of the toothed wheel 7, the tilting of the finger 10 being provided by an elastic return device when the stop 13 is erased, which occurs when the compensation spring 4 breaks, and the internal flange 14 is angularly displaced relative to the outer flange 2.

  The two rotating flanges 2, 14 are coupled by connecting means, such as rivets 15 fixed on one of the flanges and sliding in oblong slots made in the second flange, on the one hand, allowing an angular offset between them adapted to erase the stop 13 of the end of the latch 8 swinging and, on the other hand, ensuring their reciprocal training from one to the other.

  When the spring 4, whose outer end 5 bent in staple rests on the inner flange 14, performs its role of balancing the weight of the curtain 3 closing, the latch 8 is still prevented from tilting through the stop 13 , the two rotating flanges 2, 14 being furthermore connected by a return spring 16 tending to oppose the movement of the compensation spring 4 on the inner flange 14.

  As the compensation spring 4 breaks, the return spring 16 exerts on the flanges 2, 14 two opposing forces having the effect of rotating them relative to each other in the opposite direction.

  The abutment 13 then disappears under one end of the finger 10 of the latch 8. It locks in a notch 9 of the toothed wheel 7, preventing rotation of the outer flange 2, and therefore the fall of the curtain 3.

  In order to avoid a blocking of the spring box 6 by the compensation spring 4 which would be supported therein, then preventing the relative rotation of the flanges 2, 14, the spring 4 is enclosed by the ring 17 of the flange internal 14 and 18 another internal flange 19.

  The spring box 6 is thus rotatable about the support shaft 1, thanks to bearings, and is guided in axial position on this shaft by means of a guide plate enclosing the toothed wheel 7 around which it can rotate freely. . The toothed wheel 7 is fixed on said shaft 1 by a through bolt 20.

  The tilting of the lock 8 around its support axis 12 is limited by any means, such as a stop carried by the plate or the flange 14, or a circular shoulder forming a third ring disposed laterally, so that the end of the finger 10, when it is completely clear of the toothed wheel 7 in the direction of the rise of the closing curtain 3, then return, when the closing curtain 3 is lowered, to bear on a face of a cam. These cams having the same height as the teeth of the toothed wheel 7, the finger 10 of the lock 8 is thus brought, in the direction of the descent of the closing curtain 3, towards a notch of the toothed wheel 7 where it locks in immobilizing the curtain 3, after allowing however to unwind the curtain of the closure 3 by at least one additional notch relative to the previous locking position.

  The abutment 13 is made by simply stamping and folding the wall of an inner flange 14, 19, as are also the rings 17, 18.

  Figures 1 and 2 show that the outer end 5 of the compensation spring 4 of a spring box of the state of the art is bent and forms a staple. This clip is based on the rings 17, 18, vis-à-vis, stamped so as to have two aligned edges parallel to the axis of rotation of the flanges 14, 19.

  This arrangement of the outer end 5 of the spring 4 allows rapid assembly of this type spring box.

  However, if the connection of the outer end 5 of the spring 4 with the inner flange 14, 19 is obviously provided in normal function, as shown in Figure 1, it is no longer after the rupture of the spring 4 as shown in Figure 2.

  In this case, the spring 4 being relaxed, the clip 5, which is held tangentially in one direction, is released.

  The applicant company has found that the energy produced by the expansion of the spring during its rupture, and helping to detach the clip 5 from the inner flange 14, 19, is advantageously used to improve the response time of a parachute if said outer end 5 remains attached to the inner flange 14, 19 after rupture.

  Indeed, the tangential displacement of the outer end 5 of the spring during the break occurs in the direction of the angular approximation of the inner flanges 14, 19 and outer 2. The forces exerted tend therefore to strengthen the action of the spring of 16. As a result, the rocking lock 8 is released more quickly from the stop 13, and the locking of the system by engagement of the finger 10 in a notch 9 of the toothed wheel 7 occurs more rapidly.

  The fall height of the curtain 3 is then decreased compared with that observed during tests on the front spring box shown in FIGS. 1 and 2, and becomes smaller than 100 mm, therefore much lower than the limit of 300. mm imposed by the standards.

  Figures 3 and 4 show the holding of the clip 5 in a slot 21, 22 by a lug 23, 24 integral with the ring 17, 18 of the inner flange 14, 19 of the spring box according to the invention.

  Figures 7a to 7c show these lugs 23, 24, and their formation from symmetrical notches in the rings 17, 18 of the two flanges 14, 19 limiting the inside 35 of the box 6.

  The notches 21, 22 are rectangular and form rectangular tabs 23, 24 extending in a direction parallel to the generatrices of the cylinder in the form of which the spring box 6 is formed.

  Another way of fixing the outer end 5 in the form of a clip of the compensation spring 4 is to use self-tapping screws 25.

  Figures 5 and 6 show this embodiment of the spring box. The screws 25 are screwed through a hole punched in the edges of the spring, each into holes drilled in the edges of the rings 17, 18 of the flanges 14, 19.

  Before assembly, the spring boxes according to the invention are delivered in two parts - the box with the armed fall arrest system, ready for operation; a notched wheel with fixing bolt.

  One or more spring boxes 6 are used depending on the width of the rolling curtain 3. Three holes are made on the fixed axis 1 for each box: a first hole is intended for fixing the toothed wheel 7, the second to fixing the spring 4 and the last to a locking pin.

  On the axis 1, the notched wheels are all placed on the same side. The center distances between the first and second holes, and between the second and last holes, are determined according to the particular types of boxes.

  For boxes using springs whose width is between 45 and 60 mm, these centers are respectively 82.5 mm and 60 mm. For those using springs with a width of 92.5 mm and 70 mm.

  The fastening clips have to be sufficiently folded for internal 14; preferably spacing of the order of 15 mm.Rail 3 on the box 3 must not touch the flanges the staple must have a between 65 and 80 mm, they are respectively - 17 - The spring box 6 according to the invention mounted on a fixed axis 1 is as in Figure 7a.

  It does not have a spring 4. Before the spring 4 is returned to the box 6, the lugs 23, 24 of the internal flanges 17, 18 must be raised towards the periphery of the outer flanges 2 by means of the special key 26 provided with the box 6 and shown in Figures 8a and 8b.

  This special tool 26, of rectangular or square section, has a handle 27 connected to a fork 28 by an elbow 29 to 10 45. The slot 30 of the fork 28 has dimensions corresponding to those of the legs. In this way, these tabs are folded correctly without risk of rupture.

  In the case of a box designed for springs of width between 45 and 60 mm, the lugs of the rings 17, 18 of the outer flanges 14, 19 have a length of 30 mm and a width of 5 mm. The flanges are made of 20/10 sheet metal. Optimally, the width of the slot is thus about 2.5 mm and its length of 32 mm.

  The end 31 of the fork 30 is beveled on the inside of the bend 29 to facilitate the total recovery of one then the other lugs 23, 24, without the stroke of the tool is hindered by the internal walls of the outer flanges 2. The angle of the bevel is of the order of 20.

  For the same reason, the length of the fork portion 28 is of the order of half the spacing of the flanges 2, 14, 19, that is to say of the order of half the height of the box 6. The spacing of the outer flanges 2 of a typical spring box is about 75 mm (for springs 45-60 mm wide), the length of the fork 28 is therefore preferably from order of 38 mm.

  The legs 23, 24 being raised, as shown in Figure 7b, the compensation spring 4 is introduced laterally into the box 6 in the usual manner, the number of turns of the spring, its length, thickness and width having been determined at preliminary by the editor according to the usual criteria.

  The inner end 32 of the spring 4 is screwed onto the fixed shaft 1. The outer end 5 must have a return of not more than 40 mm in length and not more than 18 mm in thickness to form a staple. hanging on the edges of the inner flanges 14, 19.

  Once the spring 4 tensioned and pinned, the legs 23, 24 are folded back to their initial state, as shown in Figure 7c, also using the special key 26, so as to enclose the outer end 5 of the spring in the notches 21, 22 crowns 17, 18.

  In the particular model of spring box 6 already mentioned above, the notches 21, 22, formed during the same operation of stamping the inner flanges 14, 19 that the tabs 23, 24, have a width of 2 mm . These notches thus maintain perfectly perfectly, without risk of stall, the outer end 5 of a compensation spring 4 whose thickness is of the order of 1 mm, for example.

  It goes without saying that the invention is not limited to the single preferred embodiment and its variant described above.

  On the contrary, it embraces all the other possible variants of embodiment. In particular, the implementation of any other fastening means, known per se, the outer end of the compensation spring, such as bolts and nuts, rivets, glue or weld, would also not depart from the scope of the present invention. , provided that the connection is also maintained during and after the eventual rupture of the spring.

Claims (10)

- 19 - CLAIMS   1) A spring box (6) for a roll arresting device (3) for vertical displacement, said box (6) being of the type of those of the general shape of a cylinder having at least one lateral opening and comprising: at least one outer flange (2) rotating relative to a fixed shaft (1) and whose rotation ensures the vertical movement of said curtain (3), - a spring (4) spiral compensation of the weight of said curtain (3) by action on said outer flange (2), the outer end (5) of said spring (4) being fixed inside said box (6) on at least one inner flange (14, 19) adjacent to said outer flange (2) by fixing means, and the inner end (32) of said spring (4) being intended to be fixed to said fixed shaft (1), - a notched wheel (7) intended to be fixed on said shaft (1), - a rocking lock (8) rotated by said outer mask (2), adapted to cooperate with at least one notch (9) of said toothed wheel (7) and to block the rotation of said outer flange (2) to prevent said curtain (3) from sliding downwards from said spring (4), said rocking bolt (8) comprising a finger (10) of which at least one lateral edge (11) of the end is beveled along a plane intersecting with the casing cylinder of said toothed wheel (7), which finger (10) is mounted laterally movable relative thereto in a stroke enabling it at least to escape said notch (9), characterized in that said fixing means (21, 22; 23, 24; 25) are operative during and after said rupture.   2) A spring box (6) for a roll arresting device (3) with vertical displacement according to claim 1, characterized in that said fixing means (21, 22; 23, 24; 25) comprise at least one arranged cutout in a ring (17, 18) integral with the periphery of said inner flange (14, 19), and cooperating with the outer end (5) of said spring (4).   3) spring box (6) vertical roll-arresting fall arrest device (3) according to claim 2, characterized in that the edges of said cutout form at least one notch (21, 22) in which is engaged the outer end (5) of said spring (4), and at least one lug (23, 24) now tangentially the outer end (5) of said spring.   4) A spring box (6) vertical roll-arresting fall arrest device (3) according to claim 3, characterized in that said notch (21, 22) and said tab (23, 24) are substantially rectangular.   5) A spring box (6) vertical rolling shutter device (3) according to claim 4, characterized in that said notch (21, 22) and said tab (23, 24) extend in one direction. substantially parallel to the axis of said box (6).   6) A spring box (6) of a roll arresting device for rolling curtain (3) with vertical displacement, according to claim 5, characterized in that it comprises two exemplary vis-à-vis said inner flange (14, 19), and two copies of said tab (23, 24) each arranged in a copy of said ring (17, 18), symmetrically with respect to the middle section of said box (6).   7) A spring box (6) of a roll arresting device for rolling curtain (3) with vertical displacement according to claim 6, characterized in that it comprises two exemplary vis-à-vis said notch (21, 22) whose funds are separated by a distance at least greater than the width of said spring (4) 2875838 - 21 - and in that the width of said notch (21, 22) is slightly greater than the thickness of said spring (4).   8) A spring box (6) for a vertical rolling shutter (3) according to claim 1, characterized in that said fixing means (21, 22; 23, 24; 25) consist of at least one self-tapping screw (25) cooperating with corresponding holes arranged in the outer end (5) of said spring (4) and in said ring (17, 18).   9) A method of mounting the spring box (6) vertical rolling shutter device (3) according to any one of claims 3 to 7 of the type consisting in, in a prior step, to select the number of turns, the length, the thickness and the width of said spring (4), and to form its outer end (5) in staple, then, in a first step, to fix the inner end (32) of said spring (4). ) to said fixed shaft (1), and, in a second step, to hook the outer end (5) of said spring (4) on an edge of said inner flange (14, 19) by means of said clip (5), characterized in that it further comprises a first additional phase, performed after said preceding step and before said first step, and an additional second phase, performed after said second step, said first step of placing said tab (23, 24) in a substantially perpendicular direction the surface of said ring (17, 18), and said second phase of replacing said tab (23, 24) substantially at the surface of said ring (17, 18) so as to enclose the outer end (5) said spring (4) in said notch (21, 22).   10) A mounting tool (26) according to the method of claim 9 of the vertical-displacement roll-arresting fall arrest device spring (6) according to any one of claims 3 to 7. , characterized in that it comprises a first portion (27), forming a handle, connected by a bend (29) to a second portion (28) forming a fork, having a free end (31) beveled on the inside of said elbow (29) and an open longitudinal slot (30) extending in a plane perpendicular to that of said elbow (29), said slot (30) being of width and length respectively substantially greater than the thickness and the length of said tab (23, 24), said first and second portions (27, 28) forming an angle substantially equal to 45, and the length of said second portion (28) being of the order of half the height of said box (6).