ITTV20130099A1 - ANTI-FALL SAFETY DEVICE AGAINST BREAKAGE OF THE SPRING SERVICE SPRING WHEEL - Google Patents

Description

DESCRIPTION OF INDUSTRIAL INVENTION

With the title: â € œ FALL SAFETY DEVICE AGAINST THE BREAKAGE OF THE ROLLING SHUTTER SUPPORT SPRING "

The use of mechanical locking systems for accesses and rooms, both civil and industrial. it cannot disregard the minimum safety standards aimed at safeguarding the safety of both those who operate the system and third parties who may be in the vicinity of the closing element.

This reasoning is obviously also valid for rolling shutters, usually used to protect shops, garages, etc.,. And, even more so, for those with Î "winding shaft placed at the top, above the opening space to which the shutters themselves are designed to close, and in which there is a spring system to compensate or reduce the load on the rotating winding shaft.

Leaving aside Î “analysis on the static safety requirements, attributable to the masonry and to the static load-bearing structure, already extensively studied, codified and regulated by precise legislation, we rather address our. pay attention only to the potential static and dynamic danger given by the presence, in the system, of springs or similar elastic elements.

The role of the spring is to reduce the torque to be applied to the rotating shaft to raise or lower the shutter in a regular and controlled way, after releasing the elastic torque generated during installation with a pre-load operation. It is implicit how, lacking this torque due to possible spring breakage, the damper system becomes unstable and therefore potentially dangerous with ruinous unrolling.

The state of the art in this regard is very park of remedies: there are electronic control solutions for the integrity of the spring but as well as being very expensive they are really impractical and not infrequently subject to breakage before the breakage of the spring itself. This has prompted the various manufacturers to adopt various expedients, more suited to complying with the minimum legal requirements, rather than striving to radically solve the problem.

the invention described, on the other hand, aims to give a technical answer, which can be realized and installed, at low cost, to this question.

For reasons of simplicity, since it is not possible to describe the use of the idea for all the many similar versions of these shutters, this report refers to the application on a single device, widely known and used, known to professionals as shaft with spring compensation (or simply counter spring). (TAV, 1 - fig. 1) However, this does not mean that what has been devised is not applicable, with the necessary geometric adjustments, to other similar, conceptually equivalent systems (shafts preloaded with longitudinal springs, etc.) Now consider a mechanical shaft (ref . TAV.1 - fìg.1 - part.1), wound by a sturdy torsional spring (ref. TAV.1 - fìg.1 - part.2), which for simplification we will call the counter spring, having dimension longitudinal lower than the mechanical shaft. This set of pieces is in turn contained within an octagonal tube (only the heads are shown in the figure to allow an overall view) (ref. TAV.1 - fig.1 - even. 3).

The length of the mechanical shaft is such that it protrudes from both sides of the counter spring and of the octagonal tube. Now fix the counter spring on one side to the internal mechanical shaft and on the opposite side to the external tubular, rotating on special bearings around its axis and the mechanical shaft.

Keeping the internal shaft fixed, yes, the so-called shaft with compensation spring is made (TAV.1 - fig.1), one of the many mechanisms with which it is possible to store elastic potential energy {through the counter-spring) between the internal mechanical shaft and the external tubular. It is in fact sufficient to rotate the external tubular to preload the counter spring. With the counter spring loaded, hook the damper mesh to the external tubular. The elastic energy will be suitably exploited to help the motor (or a manual mechanical system) to develop the necessary torque to raise the entire shutter.

The state of elastic pre-load generates a state of tension between the tubular and the mechanical shaft. In the case of sudden mechanical failure of the counter spring, both parts undergo a violent counter reaction that we will exploit with our mechanism.

Up to now, to facilitate understanding, we have considered that the mechanical shaft (TAV.1 - fìg.1 - parts) was fixed and could not rotate at all. Now allow it to rotate limited by means of a partially orientable U-bolt (TAV.2 - fig.2 - detail 5), on which a torsion spring acts (TAV.2 - fig.2 - even 6) applied by a part to the bearing flange (TAV.2 - fig.2 - detail 4) and elastically forcing, on the other side, the U-bolt itself. This torsion spring (TAV.2 - fig.2 - detail 6) will snap to bring the shaft (TAV.2 - fig.2 - detail 1) to the position of least elastic stress (imposed by the limitation to the rotation of the jumper).

And this will happen both with the counter spring discharged and in tension (pre-charged).

With reference to TABLE 3, we interpose between the supporting flange the structure (TAV.3 - fig.3 - pari.4} and the tubular damper holder (TAV.3 - fig3 - pari.3}, two pieces suitably designed to fit between They.

To simplify the description we will call these pieces, gears - One of the two, called the rotating gear (TAV.3 - fig.3 - even 7), is fixed to the rotating tube, and can therefore rotate with respect to the mechanical shaft (TAV.3 - fig. 3 -part.1). On the other hand, which we will call locking gear (TAV.3 - fig.3 - part.8), only the axial translation along the mechanical shaft is allowed but any rotation is prevented. A compression spring (TAV.3 - fig.3 - par.9), axial to the mechanical shaft, pushes the locking gear against the rotating gear. The particular notched machining allows the total interpenetration (TAV.4 - fig4) between the two gears with the blocking of any possibility of rotation. By manually removing the locking gear, by means of axial sliding, and overcoming the force of the compression spring, there is no longer any interpenetration between the gears (TAV.4 - fig5) and the tubular group can rotate, loading the counter spring or letting it exercise its strength, if already pre-loaded.

The possibility of manual axial retraction of the locking gear, the studied conformation of the same as well as the possibility, mentioned above to allow a limited axial rotation to the mechanical shaft, allows it to rotate together with the locking gear than allowed by the U-bolt (TAB.2 - fig2 - even 5) until reaching a new position in which two serrations of the locking gear are aligned with the two mechanical stops (TAB.3 - fig3 - even 10).

The compression spring (TAV.3 - fìg3 - part.9) will axially push the locking gear against these mechanical stops. . The simultaneous presence of these mechanical stops and the friction between these metal parts force the locking gear (TAV.3 - fig3 - par.8) to maintain this position, even though the shaft is mechanical, and consequently the gear integral with it, also subject to an elastic torque due to the torsion spring (TAV.2 - fig2 - detail.6) operating on the U-bolts (TAV. 2 fig.2 detail.5). This elastic torque would tend to return the system (mechanical shaft and locking gear) to the condition of greater equilibrium corresponding to that in which the protruding part of the teeth of the locking gear is exactly in line with the recessed part of the teeth of the rotating gear. .

This precarious but still stable position allows the gears to be kept detached (rotating and locking) and therefore allows to carry out all the maneuvers foreseen in normal operating conditions on the damper door tube (pre-rotation for loading the counter spring, clockwise - anticlockwise rotation for the ascent - descent of the shutter).

When the counter spring breaks, the pre-existing tension between the mechanical shaft and the damper holder tube ceases immediately, developing a counter reaction. This additional, impulsive torque, generated by chance due to the breaking of the spring, is added to the elastic torque already present due to the torsion spring (TAV.2 - fig2 - part.6) operating on the U bolt (TAV. 2 fig.2 part.5 ). Together they are able to overcome the friction force, due to the compression spring (TAV.3 - fig.3 - detail 9), between the mechanical stops (TAV 3 - fig.3 - even. 10) and teeth of the locking gear (TAV.3 - fig.3 - part.8). The effect is to bring the mechanical shaft and the integral locking gear back to the position prior to manual rotation, and corresponding to that in which the protruding part of the locking gear teeth is exactly in line. with the hollow part of the teeth of the rotating gear.

Since there is no interference between the mechanical stops (TAB. 3 - fig. 3 - detail 10) and the protruding teeth of the locking gear, the elastic thrust of the compression spring (TAV. 3 - fig. 3 - detail 9) ) will violently translate the locking gear along the axis of the mechanical shaft until it interferes with the rotating gear again.

The locking gear, which can only translate axially and not rotate on its axis, will penetrate into the rotating gear, and will exert its locking action on rotation also on the latter and ultimately on the entire tubular door damper preventing therefore the fall of the same due to the break

Claims (2)

CLAIMS 1) System consisting of a mechanical shaft (TAV.1 - Fig.1 - part.1 and / or TAV.2 - Fig.2 - part.1), to which it is granted, through a mechanical device applied to it (TAV .2 - Fig. 2 - even 5), rotate a few degrees. An elastic system acts on the tree (TAV.2 - Fig, 2 - even. 6) which forces the tree to a stable static equilibrium position. A mechanical part is applied on said shaft, which we will call locking gear (TAV.3 - Fig. 3 - even. 8) free to translate only axially, having a shape similar to a gear with lateral toothing arranged towards an identical mechanical part, which we will call rotating gear (TAV.3 - Fig. 3 - even, 9) with opposing and interpenetrable toothing, except that axial rotation is allowed. The locking gear is constantly pushed towards the rotating gear by a compression spring (TAV.3 -Fig.3 - even 9). The rotating gear is hooked to the rotating tube (TAV 3 - Fig.3 - part 3 and / or TAV.1 - Fig.1 - part.3) of the shutter and the latter is integral with one of the ends of a powerful torsional spring, named counter spring (TAV.3 - Fig.3 - part.2 and / or TAV.1 - Fig.1 - even 2). The other end is hooked to the mechanical shaft .. On the locking gear there are one or more geometrically structured areas on the external circumference in order to interfere with external mechanical stops (TAV.3 - Fig.3 - part.10 ) angularly arranged in correspondence with the maximum rotation point granted to the mechanical shaft. It is possible to manually move the locking gear away from the rotating one, overcoming the force of the compression spring and subsequently, after rotating the mechanical shaft, the locking gear is brought to interfere with the mechanical stops. The surfaces of the stops and the locking gear are shaped in such a way as to generate, due to the axial thrust of the compression spring, a frictional force capable of balancing the torque generated on the mechanical shaft by the torsion spring (TAV. 2 - Fig. 2 - part. 6) acting on the U-bolt (TAV.2 - Fig, 2 - part.5). The position taken by the locking gear is therefore stable, albeit precarious. From this position the gear will move due to the recoil acting on the mechanical shaft caused by the breakage of the powerful torsron spring, previously and suitably pre-loaded to perform its role of enslavement to the electro-mechanical or manual lifting devices. Upon breaking, almost instantaneously, the shaft will first rotate with the relative disengagement of the mechanical stops, and no longer interfering with them, the compression spring will axially translate the locking gear against the rotating gear, locking it and consequently locking it. also the tubular of the shutter and the links of the same hooked to it, thus preventing it from falling. 2) Mechanical system like the one previously described where the mechanical shaft is replaced by an equivalent device or having the same functions 3) Mechanical system like the one previously described where the U-bolt with spring is replaced with devices having the same function, either placed outside the bearing flange, inside it, or incorporated in the mechanical shaft or similar. 4) Mechanical system like the one previously described where the compression spring is replaced with an equivalent elastic system 5 Mechanical system like the one previously described where the counter spring is replaced by similar elastic systems capable of creating a pre-loading torque capable of mechanically enslaving the damper's rising devices 6) Mechanical system like the one previously described where the mechanical stops are integral with the locking gear and / or the surfaces machined to allow friction are external to the locking gear 7) Mechanical system like the one previously described where the locking and rotating gears having a shape similar to the external toothing, or