FR2786219A1 - Operating mechanism for sliding door, comprises fixed motor unit driving either opening or closing roller, bearing on door's friction track, impelling door along fixed guide channel - Google Patents

Abstract

The door is suspended from a fixed guide channel (6) by rollers running in the latter's interior. Opening effort is applied to the door by a smooth drive-roller bearing on a friction track (5) fixed along the door top; another such roller applies closing effort. Each roller is integrally connected, coaxially, with a toothed wheel (7) permanently meshed with a toothed driving wheel (2), mounted at a fixed point on the wall above the guide channel and rotated by a geared motor (2), in one direction to close and in the other to open the door. The driven wheels, with the associated rollers, are carried at the ends of a support bar (3), tilting about the driving wheel center. A weak friction coupling with the latter wheel causes the bar to tilt in the appropriate direction when the motor starts, bringing the corresponding drive-roller into contact with the door track. A short inclined toothed rack (9) engages with the driven toothed wheel as the door finally closes, re-aligning the support bar. The friction track is slotted to accept magnetic inserts required for end-of-travel sensors.

Description

-1- The present invention refers to a mechanism for opening and

  sliding door closure, which has been specially and preferably designed to be adapted to cold room doors, although it is applicable to any technical sector in which it is necessary to obtain a rapid and safe opening and closing a door by sliding, as is the case for access to nangars, freight elevators, etc. The object of the invention is to obtain the integration of almost all the operating components of a compact block, as well as a simplicity of

  assembly and reduced production costs.

  Another object of the invention is to prevent the condensation of water, which usually occurs in refrigeration chambers in which the mechanism which interests us is specially applicable, from causing the

  bearing producing the movement for opening and closing the door.

  The object of the invention is also to prevent the door from jumping when it

  reaches the open position and can sometimes remain ajar.

  The damping of the door movement when it reaches the end of its travel is

also improved.

  The driving team is integrated in a compact block, it has a very mounting

  simple and therefore provides a reduction in production costs.

  Currently, the sliding door opening and closing mechanisms used include in their structure complex pulley mechanisms actuated by belts or chains and racks whose

mounting requires large spaces.

  These complex mechanisms therefore exhibit anomalies in

  operation and a large number of failures.

  In general terms, the mechanism for the opening and closing of sliding doors which constitutes the object of the invention, consists in incorporating on the upper edge of the sliding door, a friction track on which a new compact mechanism for setting market will intervene. The door remains stopped and moves along the guide

corresponding slide.

  In accordance with the invention, a gearmotor is mounted which moves the conductive toothed wheel mounted on a pendulum support entwined on a fixed point

  of the bodywork, at a level higher than that of the door friction track.

  The mentioned toothed driving wheel permanently meshes with two other side driven wheels, these latter have a cylindrical projection or smooth bearing which materializes the sliding wheel which causes the drive with the friction track of the upper edge of the door, when a contact cst established with the latter. Depending on the direction of rotation of the gearmotor, the contact with the friction track is made with one or the other sliding wheel, being given that, when the motor starts its rotation, the balance moves slightly and angularly up to the establishing contact with slight pressure. This application pressure can be mechanically

  limited using the relevant bumpers.

  Provision has been made for the door leaf to have on its upper part a small oblique rack sector with which the corresponding coaxial driven wheel can mesh, thanks to this a perfect release is obtained which would have taken place at the time of closing. It must be taken into account that, in the closed position, certain doors

  fit to guarantee watertightness.

  Once the movement of the door has started, the sliding wheel secured to the corresponding driven wheel acts on the friction track of the door, by moving it. To close the poite, the operation is done in the opposite direction of rotation

of the motor.

  the following other details must also be taken into account: - The balance has a relative movement associated with the rotation of the conductive wheel activated by the gearmotor, thanks to its mounting by means of friction linings which move it, until that one of the sliding wheels touches the track and stops, by overcoming the tightening torque of the friction linings which served to effect the displacement. In use, this coupling can wear out and to adjust it, a nut is provided.

  tightening which keeps it in perfect friction conditions.

  - Above the oblique rack-and-pinion sector, the door also has a small stopper which at the time of closing guarantees the correct repositioning of the balance in order

  avoid unwanted clashes which would block the opening operation.

  - The movement of the pendulum arms is also limited by means of two ridges

  adjustable which thus controls the differentiated force generated by the driven wheels.

  The friction track itself has a configuration such that it allows magnetic sensors to be housed in its interior in order to define the limit switch,

  by collaborating with readers integrated in the same motor assembly.

  In order to comply with safety standards, during its covering or closing movement, the door stops when it finds an obstacle which exerts a pressure lower than that determined by said standards. This means that

  the sliding wheels spin on the friction track.

  The friction track on which one of the sliding wheels rests has been designed to be separate rather than smooth to prevent the condensation of water which usually occurs in refrigeration chambers. cause the sliding wheel to spin with a smooth lead strip so that it can skate only if there is an obstruction of the closing phase, as a safety standard previously commented on Another improvement introduced consists in the forecast means which Uxent the open position by preventing the door from jumping and being able to remain open. For this, we placed a flat stopper which configures an intervention surface for a suction cup placed on a support fixed on the end of the

sliding guide.

  When the door arrives in the open position, the flat stopper links to the latter and more concretely to the friction track, remains adhered to the suction cup. The bellows own structure of the suction cup determines damping means,

  The suction cup can be calibrated to adjust the desired degree of fixation.

  In order to facilitate understanding of the characteristics of the invention and as an integral part of this descriptive memory, we enclose sheets of plans in the figures of which, by way of illustration and not limitation, we have represented Figure 1. It is a schematic view of the sliding door opening and closing mechanism, object of the invention, mounted on a

closed position.

  Figure 2. It schematically shows the positions of the Dalancier linked to the gearmotor, so that the door opens or closes, respectively in phases aetb. Figure 3. It is a schematic side projection view of one of the side gears for moving the door, it also has its

  relative position with respect to the door friction track, partially shown.

  Figure 4. This is a partial view, on a larger scale, of the runway of - -T -4-

  friction, which must be mounted integrally on the upper edge of the door.

  Figure 5. This is a schematic profile view in order to view the mechanism for opening and closing, which includes the sliding guide and the friction track, as well as the relative position of the door leaf, partially shown in Figure 6. It is a schematic view in frontal projection of what is

shown in figure 5.

  Figure 7. It is a view similar to that of Figure 6, but without including

  the gear motor and its output axis.

  Figure 8. This is a schematic view of a mechanism for opening and closing sliding doors, the door being in the closed position and after

  inclusion of anti-jump means of the door.

  Figure 9. It is an enlarged view of the drive assembly, one of the sliding wheels intervenes on the friction track, materialized by a toothed rack in order to perfect the attachment, in accordance with the present invention Figure 10. It is a partial view on a larger scale of the end of the fixed sliding guide from that which is stopped in rolling fashion, the sliding door comprising the suction cup which defines the anti-jump means of the door in

open position.

  Figure 11. It is a side view to observe the fixed guide and the abutment

  flat secured to the friction track, on which the retaining suction cup operates.

  By referring to the number adopted in the figures, we can see how the mechanism for opening and closing sliding doors, proposed by the invention, comprises a geared motor 1 which causes the rotational movement in one direction or another of the wheel conductive 2 cldentée which is mounted on a central point of the pendulum support 3 placed on a tenth point of the wall at a level higher than that of door 4. Door 4 has on its part

  the friction track 5 and can move on the sliding guide 6.

  On the ends of the balance support 3 and on each side of the conductive wheel 2, there are concluded wheels 7 which permanently mesh with the conductive wheel 2 Depending on the direction of rotation of the engine during the start-up phase, the balance support 3 tilts to one side or the other, as shown in FIGS. 2a and 2b until the corresponding driven wheel 7 and more concretely the sliding wheel 8 which is axially integral with the latter, establishes the contact with the friction track 5 of the door leaf 4. From this moment, the movement of the door begins in the direction of opening or closing until cc

  it reaches the correct position limited by a limit switch.

  In the figure we can see referenced under number 9 the section of rack dc short length and which is placed obliquely on an extreme upper zone of the door 4, so that the latter receives the driven wheel 7 toothed and thus cause the stall from the closed position, given that, as previously indicated, some doors remain embedded in the closed position. We now make a special reference to FIG. 4 which partially presents the friction track 5 which is integral with the door 4, the friction surface for the sliding wheel 8 (FIG. 3) of the side gear wheels 7, is referenced under the number 10 and has a hollow or longitudinal opening 11 in order to insert the

  magnets which activate the limit switches.

  In FIG. 5, the tractor assembly, referenced under the number 12, is coaxial with the central conductive wheel 2, where the friction linings are mounted which angularly move the balance 3 until the corresponding sliding wheel 8 touches the

  friction track 5 and stops, adding up the pre-established tightening torque.

  In Figures 5 to 7 o0 sees, with more accuracy, the relative position of the different elements, on the mounting of the mechanism. Reference 13 designates the mounting brackets of the

  sliding guide 6 as parameter.

  If we now refer to Figures 8 to 11, we can see a structure of the mechanism for opening and closing the sliding door 4 suspended on the sliding guide 6 fixed. The poilrte 4 includes on its upper part the rolling or friction track 5 on which the sliding wheels intervene, integrated in the driving team, the structure of which is more clearly visible in FIG. 9, generally referenced under the number 14. The drive assembly is activated by a gearmotor not visible in these figures which causes the rotation of a conductive toothed wheel, mounted on the central part of the pendulum support 3 'and which permanently engages on the driven wheels 7 mounted on the arms of the 3 'pendulum. The drive assembly 14 is placed on a fixed point on the body, at a level higher than that of the sliding guide 6, so that the respective smooth wheels 8 ′ can achieve contact with the friction track 5 , linked

at door 4.

  The sliding wheels 8 'are integral in rotation and coxial with the respective toothed driven wheels 7', their attack surface is smooth, although in this case the diameter

  is greater than that of the gears 7.

  When the gearmotor intervenes, the pendulum support 3 'moves slightly and angularly in the corresponding direction so that the relevant driving wheel 8' establishes contact with the friction track, materialized, in this embodiment, by a rack 15 the teeth of which prevent the smooth surface of the sliding wheel from slipping as a result of the condensation water which forms in these chambers

  refrigerators, as mentioned above.

  The reference 9 in FIG. 9 designates the small oblique rack-and-pinion sector, with which the driven wheel 7 is likely to come into contact when the door 4 is closed. The latter meshes between the driven wheel 7 and the oblique sector at rack 9 and determines that when opening, the drive movement is ensured, there is no possibility that the smooth strip of the sliding wheel 8 'slips with respect to the

  i 5 rack, the most expensive in these initial moments.

  After the simple coupling pressure of the sliding wheel 8 'on the toothed rack 15, is enough to correctly carry out the opening stroke of the door, until the flat stopper 16 fixed on the end of the track b, comes into contact with the suction cup

  17 fixed on the end of the sliding guide 6, on the support 18.

  In figure 11 we can see the position occupied by the toothed rack 15

  which materializes the friction track 5.

  According to another characteristic of the invention, the door 4 is equipped on the oblique rack-and-pinion sector 9 of the stopper in order to fix the position of the pendulum support 3 and not to block the opening operation, the hair remaining completely free to be put in

works manually.

Claims (5)

  1. Mechanism for opening and closing sliding doors, specially applied on the doors of cold rooms or where there is a need for a quick and safe effect of opening and closing a door, by sliding, the upper edge of said door being equipped with suspension means rolling on a fixed guide, characterized in that it is constituted by a geared motor (1) which moves a conductive wheel (2) toothed which permanently meshes with two other driven wheels (7 ) toothed, mounted on a   pendulum support (3) hanged on the axis of the conductive gear wheel (2), the support-   pendulum moving slightly in the direction of rotation of the motor (1), until a sliding wheel (8, 8 ') axially integral with the respective driven gear (7) of the pendulum support (3) establishes contact with the friction track (5) integral with the upper edge of the door (4), the latter moving towards the open or closed positions. 2. Mechanism for opening and closing sliding doors, according to claim 1, characterized in that the door (4) is equipped on its upper part with a small rack sector (9) in an oblique position, on which the driven toothed wheel (7) is located which causes the door to open, to cause the stalling of the position closing.   3.- Mechanism for opening and closing sliding doors, according to one or   the other of claims 1 and 2, characterized in that the door (4) is fitted on the   oblique rack and pinion sector (9) of a stopper in order to fix the position of the pendulum support (3) and not to block the opening operation, the door remaining completely free to be started manually.   4.- Mechanism for opening and closing sliding doors, according to one   any one of the preceding claims, characterized in that the movement of the   arm of the pendulum support (3) is limited by adjustable buffers which control the force   differential generated by the gear wheels.   5.- Mechanism for opening and closing sliding doors, according to one   any one of the preceding claims, characterized in that the friction track (5)   has a configuration such that it allows sensors to be placed in its interior to mark the end of the race in collaboration with integrated readers, preferably in the same engine assembly.   -8- 6.- Mechanism for opening and closing sliding doors, according to claim 5, characterized in that the friction track (5) driven by the respective sliding wheel (8, 8 ') is affected by teeth a rack (15) which improves its drive on the smooth strip and the attack of the corresponding sliding wheel (8,8 '). 7. Mechanism for opening and closing sliding doors, according to claim 1, characterized in that the sliding guide (6) comprises anti-jump means (16, 17) for the door (4), fixing the position opening stable way.   8.- Mechanism for opening and closing couhssalntes doors, according to claim 7, characterized in that these anti-jump means (16, 17) mentioned, are materialized by a suction cup (17) mounted on a support (18) on the end of the sliding guide (16), on which a flat stopper (16) linked to the door, fixed on the friction track (5)