EP1055791B1 - Automatically unlockable security linkage with catching position - Google Patents

Abstract

Changing from the closed secured position with pin (11) fast-latched (14), the pin has to be moved relative rod (8) into the closed setting and so clear of the latch (14) or return to the latch by reverse movement. The rod (8) moves only sluggishly in i joint (10) and can be bolted in its de-latched position by means of an endstop (20) whose condition is governed by the degree of swivel to reach its operative top setting. The stop (20) can act as driver (18) when operating towards the window cleaning posit and is arranged on an arm of the scissor linkage lever (7) as coupled to the rod (8) through a pin and hole coupling (11-15), an between the scissor linkage arms (7,6). At its non-joint end (10) the rod (8) itself acts as endstop near its nose part (16) and between the active and waiting positions of the nose. The nose uses its control sector (17) which releases the endstop (20) once de-latched to allow the endstop to adopt its operative setting. In the active setting the endstop works with the back stop (18) the nose (16) and in this way entrains the rod (8) towards the cleaning position, or again moves the back stop (18) along the ma endstop (20).

Description

The invention relates to a pair of scissors for by a skylight opening device between the closed position and a tilt-ventilation position movable tilt wing of windows or doors. Also affected is a working method for such scissors.

A tilt-securing folding scissor according to the preamble of claim 1 (= KSP scissors) is known from DE-B 28 12 894 (W. Hautau) . In this document it should be noted that such tilt wings are controllable by a skylight opening device between the wing-closed position and a tilt-ventilation position in both pivoting directions. Such wings can usually only be cleaned from the inside. However, this is not possible in the tilt-ventilation position, so that for cleaning the wing - after hanging out of the skylight opening device - must be tilted in a cleaning position inside. Thus, the wing after hanging by hand not unexpectedly beat down in the cleaning position, the Kipplage limiting KSP-folding scissors is provided, which is arranged in a lateral Flügelfalz The known folding scissors has a hinged with two scissor arms catcher, with the a scissor member is coupled via a distance-variable slot / pin connection, wherein the slot has a catch into which engages the post after the release of the wing of the fanlight opener and thus limits the (further) tilting movement of the wing. The slot is formed so that one end of the elongated hole receives the pin in the closed position of the wing and the other end of the elongated hole the pin in the cleaning position.

If the wing falls into the secured position after being hung, it must be released by hand to bring the wing into the cleaning position. To increase safety, it is usually customary to install such a tilt-fuse-cleaning scissors on both wing sides. In order to pivot the wing in the cleaning position, therefore, the catch rods of the two scissors must be successively unlocked by hand, which provides the danger that slips when grasping the wing to the user.

When returning to the closed position need. the catch bars are not to be operated by hand.

EP-A 889 187 A2 (Skoda) relates to a device for automatically locking pivotable elements in two positions. There is a manual lock provided, cf. There column 2 from line 40. In order to bring the tilting element described there (there 2) in an overall open position, it is necessary to solve a lock (there 7) manually. By this solution movement of the elongated pin described therein is removed from a side recess and allows the alignment of three articulated arms which together form the scissor member described therein. Also with a manual pressure on a arcuately curved arm works the DE-A 1 941 389 (Citroen) . A local door is to be pivoted between two horizontal positions and a release from an intermediate position is only possible when a pressure is exerted on the curved arm in the central region (there 12). The closer operating positions shown in the single figure there show, especially in the intermediate layer, which extends vertically, the time at which then the horizontally acting pressure on the curved arm is required to move the pin out of the inlet section (there 11c). It seems essential that an only backward-oriented movement of the door described there would cause no release from this inlet region 11c, rather the pressure on the central region of the arm against the action of a spring shown there is mandatory for release.

A proposed only for car doors linkage of several links is known from US-A 2,857,617 (Loria, General Motors) . There is described a control process when opening a car door, during which opening movement a holding state exists (there column 2 from line 60). The holding state provides a gentle locking of the open door without making it impossible to lock or lock it. It is a control operation in which a nose-shaped control member extends along a surface (there 34,35,36), wherein the central portion extends substantially perpendicular to the other two portions and thus allows the holding state of the nose with the cam surface.

DE-A-3446035 (W. Hautau) avoids weakening of the handlebar and works with a detent on the outer edge, on which a sliding block engages. To release the user attacks on the shoe (there on page 10 above).

The EP-A-471172 (Geze) catches the impact on impact in the cleaning position by an elastically deformable arm, for example. as corrugated shaped handlebar section (there abstract). A free tax is also done by hand (there column 6, lines 36-52).

It is an object of the invention to develop a safety scissors so that on the one hand, the automatic collection of the wing after release of the fanlight opener is still ensured, but also at the same time a direct manipulation of the handlebar one or both scissors is unnecessary in succession. The handling should be considerably simplified and the security significantly increased.

This object is achieved with claim 1 or 14.

As previously in the KSP scissors engages after release of the wing of the fanlight opener of the pin of the slot / pin coupling automatically in the safety catch, so that the wing safely caught in a limited, but the normal tilt position α _K tilt angle α _S exceeding is, in particular, if in each case side scrapers such a pair of scissors is arranged. In order to be able to continue to pivot the wing free of the fanlight opener safely into the cleaning position α _P , the wing is pivoted back a small distance. Since the scissors is designed so that in this case the scissors part, which carries the cross in the slot of the handlebar pin, is pivotable relative to the handlebar, due to this movement is carried out a unlatching, ie, the pin is moved out of the locking catch of the handlebar. In this Entraststellung the handlebar against the pin is so influenced or "controlled" that the pin can indeed move freely along the slot, but the handlebar no (authoritative) can perform relative angular movement relative to the pin more, leading to a Wiederverrastung in the Could lead to securing position (claim 1).

For this process, therefore, only a slight pivoting movement of the wing or the two scissor arms against each other is necessary without the user touching the scissors to operate or adjust or trigger something. The user can therefore leave his grip (his hands) on the wing when unlocking as well as in the subsequent pivoting in the cleaning position. The handlebar need not be separately "unlocked" by hand (claim 14).

In order to ensure the relative movement between the pin and securing catch for the Entrastvorgang, the handlebar can be hinged in the region of its fixed pivot pin stiff.

In order to lock the handlebar in the Entraststellung or controlled continue in the slot, a stop for the handlebar is provided. This is effective in response to the pivoting movements or the angular position of the handlebar and is thus controlled by the handlebar, between a stop effective position and a (not effective) standby position (claim 4, claim 7). The stop effective position of the stop causes the handlebar is taken with a pivoting for cleaning position, while the pivoting in the opposite direction only blocked and later self-freewheeling again to avoid damage to the stop. This allows the handlebar, despite its stiff linkage in the area of its pivot pin reliably join the movement of the wing and scissor parts of the securing position in the cleaning position, while a reclosing is reliably turned off in the backup position.

The stop acts as a short elbow long as a driver for the handlebar, while a moving relative movement of the handlebar takes place at the stop.

The driving stop is resiliently biased towards its stop effective position (claim 6).

During the pivoting back of the wing from the cleaning position in the direction of the tilted position, the stop is automatically actuated back into its elastically prestressed ready position by the handlebar, so that now the pivotal movement of the link can take place unhindered in the opposite direction (claim 14). Thus, the user does not need to take any action on the scissors for the return pivot movement in order to cancel the stop action of the pivot limiting stop.

To simplify the understanding of the scissors is described in the installed state, in which it is arranged in the fold between the frame and sash. Tilting position, closing, cleaning and catching position of the scissors are based on the same positions of the sash.

According to the invention, the manual operation of the handlebar in favor of a controlled movement by the relative movement of the two long scissor arms continues. The exact relative movements or the pivoting angles, which according to the invention have an up-down component-starting from the catching position α _S -are empirically probable and need only a predetermined minimum dimension exceed to create by the then forming stopper a driver, which steers the pin out of the securing catch and leads into the groove, in which he would otherwise have only come if a manual operation of the handlebar takes place. The control by relative pivoting of the two scissor arms thus transmits through the stop on the handlebar, being ensured that at a too far backward operation in the direction of the closed position of the stop is not damaged, but can be driven back automatically back into the ready position.

The handle has this in the region of its end facing away from the joint on a certain contouring that allows the stop, at a certain angular position of the handlebar and predetermined angular position of the scissor arms to be released, but at the same time in too strong backward movement of the contouring of the free end to be controlled back of the handlebar (claim 18).

The contouring of the free end of the handlebar may include a further recess which abuts against a further stop on the scissor arm, which is not operable in different positions or positions, so that in the closed position of the scissors, in which both scissor arms are superposed, in between lying handlebar permanently blocks a swivel angle limitation in the direction of negative angle. This "push-through protection" prevents the stop is released to an undesirable moment, and the contouring of the free end of the handlebar ensures that starting from the push-through, at an angular position "zero", to the catch position a free control of the first stop not rather, it remains securely held in its ready position.

Only the backward operation of the scissor arms ensures a free control of the stop.

This control function of the handlebar with its specially designed contouring at the free end allows the separate manual operation free solution of the wing (unlatching) from the safety catch position α _S.

According to the pin is unlocked and locked against re-intervention (claim 1). The unlocking of the pin from the securing recess is effected by a limited relative movement of the scissor arms, for the transfer of the scissors in the cleaning position (claim 1); the pin is doing as it were from the Locked out recess, although the pin is fixed to the scissor arm. Turned another way, the handlebar is controlled so that the pin does not move back into the safety catch, but is driven past the pin-facing corner of the locking latch, in the elongated track into it. The outward control and the avoidance of falling back into the rest position creates the stop (claim 14), which is retained by the handlebar first in an inoperative position directly or indirectly until it is released by the operation of the scissor arms.

On the way back from the extended position back into the tilted position in which the skylight opener is to be engaged again, the stop can be returned to its standby position (automatically) (claim 14).

Finally, the handlebar is also designed at its free end so that the stop can not be damaged if a user when unlocking the wing moves back too far in the closed position (claim 18).

It is to be understood that the invention claimed as an Arberts method is in process performed on a scissor assembly according to claim 1 when actuated.

Figur 1

zeigt schematisch und in Seitenansicht einen Kippflügel 2 und die zugehörige Kipp-Sicherungs-Putzschere 5 in den verschiedenen relativen Stellungen α_K, α_S, α_P gegenüber dem Blendrahmen 1.

Figur 2

zeigt in Aufsicht einen Ausschnitt der Kipp-Sicherungs-Putzschere 5 in der Schließstellung (des Flügels).

Figur 3

ist eine Seitenansicht des einen Arms 7 mit Anschlag 20.

Figur 4

ist eine Seitenansicht der Schere 5 in der Schließstellung, mit einem Lenker 8 zwischen beiden Scherenarmen 6, 7.

Figur 5

zeigt die Schere 5 in der Sicherungsstellung α_S.

Figur 6

zeigt die Schere im Augenblick des Entrastvorganges, kurz nach Figur 5.

Figur 7

zeigt die Schere nach dem Entrasten von Figur 6, bevor der Flügel in die Putzstellung geschwenkt wird, beim steuernden Führen des Zapfens 11 an der Rast 14 vorbei.

Figur 8

zeigt die Schere in der Putzstellung α_P.

Figur 9

zeigt die Schere nach dem Schwenken aus der Putzstellung in einer Stellung, in der der Flügel wieder mit dem Oberlichtöffner gekuppelt werden kann.

The invention will be explained in more detail with reference to schematic drawings of an embodiment.

FIG. 1

shows schematically and in side view a tilting wing 2 and the associated tilt-fuse-cleaning scissors 5 in the various relative positions α _K , α _S , α _P relative to the frame. 1

FIG. 2

shows a plan view of a portion of the tilt-fuse-cleaning scissors 5 in the closed position (of the wing).

FIG. 3

is a side view of the one arm 7 with stop 20th

FIG. 4

is a side view of the scissors 5 in the closed position, with a handlebar 8 between the two scissor arms 6, 7th

FIG. 5

shows the scissors 5 in the securing position α _S.

FIG. 6

shows the scissors at the moment of Entrastvorganges, shortly after Figure 5.

FIG. 7

shows the scissors after unlatching of Figure 6, before the wing is pivoted to the cleaning position, when controlling guiding the pin 11 at the catch 14 over.

FIG. 8

shows the scissors in the cleaning position α _P.

FIG. 9

shows the scissors after pivoting from the cleaning position in a position in which the wing can be coupled again with the skylight opener.

In the explanation of the different positions securing position, tilting position and cleaning position is taken to angle specifications α _S , α _K and α _P , representing the tilt angle of the wing 2 and simplifying the corresponding positions of the scissors arms 6,7 and the handlebar 8 to each other.

In the figures, the skylight opening device 4 is not shown, as this is common and readily known to those skilled in the art, both in their construction and in their mode of operation.

FIG. 1 shows the frame 1 and the sash frame 2 hinged thereto via a horizontal tilting axis 3. FIG. 1 shows the tilt angle α _K of the sash, in which area the sash can be controlled in its movements by the fanlight opener in a known manner. In order to pivot the wing in the cleaning position with the opening angle α _P , as shown in phantom in Figure 1, must be uncoupled in the tilt-open position, the wing of the skylight opening device. In order to prevent that the wing after uncoupling in the cleaning position or can strike even deeper, folding shears 5 are arranged in the fold areas on the sides of the wing 2, one of which is shown in Figure 1.

The scissors 5 has a first shearing part 6, which is articulated at 6a on the frame. A second shearing part 7 is articulated at 7a on the casement 2. Both scissors parts are hinged together via a fixed joint 9. The two scissor parts is associated with a handlebar 8, which is articulatedly connected or coupled with two scissor parts, which can be seen more clearly from the following figures.

According to Figure 6 , the handlebar 8 is hinged to the scissor arm 6 at a distance from the fixed scissors hinge 9 via a fixed (non-displaceable) pivot pin 10. The handlebar 8 has a slot 15 which has between its ends 12 and 13 a recess 14 for the pin 11, which is guided in the slot and can engage in the detent 14. He is firmly attached to the scissor arm 7.

At the end facing away from the articulation point 10, the handlebar 8 has an independently significant control area 16, which is configured in a certain way, as can be seen from FIG.

In the swivel range of the control lug 16, a stop 20 is arranged on the scissor arm 7. This is resiliently biased in the direction of its blocking or effective stop position and it is movable from this operative position into a preloaded ready position, under the control of the control portion 16 of the arm 8.

In Figures 3 and 4 , the two positions of the stop 20 are visible. Figure 3 shows a side view of the scissor arm 7. At this stop 20 is fixedly arranged in the form of a spring element. The pointing in the direction of the handlebar end of the resilient stop element is in the locking effective position of Figure 3 from the Level of the shearing part 7 protruding formed (shown by arrow "z"). The end has a bump or projection 21, which forms with its front side a ramp 22, while in a direction perpendicular to the bump 21 acts as a lateral limit stop 21a, see also Figure 8 . The shearing part 7 has, in the region of the hump or buckle-like bent-up end of the stop 20, a recess 25 into which the front end of the stop can be received in the preloaded ready position, as shown in FIG.

Instead of forming the stop itself as a spring element, a pin-shaped or the like trained stop can be provided, which is guided in a guide perpendicular to the plane of the shears part 7 movable and biased by a separate spring in its operative position. Also in this case, the stop element in two mutually perpendicular directions on a driving edge 21 a on the one hand and an inclined ramp surface 22.

As is apparent from Figures 2 to 4 , the two shearing parts 6 and 7 and the handlebar 8 in the closed position of the wing in the sash immediately above the other. The stop is held in its standby position by the handlebar 8 itself, which presses the stopper 20 in the recess 25. The movements of the stop from the standby position in the blocking position in the direction "z" and vice versa (in the direction "-z"), are controlled by the movements of the handlebar and by itself.

If the wing 2 is released from the skylight opener for the purpose of cleaning, it pivots from the maximum tilt position α _K (dashed lines in Figure 1) in the securing position with the opening angle α _S. In this case, the pin 11 slides from the end 12 of the elongated hole along the lower (right) edge of the oblong hole, which leads into the securing catch 14. The pin thus automatically enters the safety catch and thus secures the wing in the solid shown in Figure 1 securing position. This is facilitated by the fact that the handlebar 8 is hinged tightly in the region of its fixed joint 10 on the scissor member 6.

In order to bring the wing in the cleaning position, the pin 11 must be led out of the securing catch 14. Since the handlebar 8 is hinged hinged at its pivot point 10, a small pivotal movement of the wing 2 with the scissor member 7 in the closed position is sufficient to move the scissor member 7 relative to the handlebar 8 in the direction of arrow 31 in Figure 5. At this movement, the pin 11 participates (arrow 33). He breaks away from the rest 14 and arrives the left in Figure 6 (the upper) boundary edge of the elongated hole 15. The angle 32 between the arm 8 and scissor member 6 need not be changed in this Entrastbewegung.

As a result of the relative pivoting movement between the scissor part 7 and the handlebar 8, the control lug 16 slides over the stop 20 and releases it when the position according to FIG. 6 is reached, or shortly before. Due to its bias, the stop can move from the position shown in FIG. 4 to the position according to FIG. 3, in which its lateral stop edge 21a enters the (possible) pivoting travel of the control nose 16. If the wing is then moved back again in the direction of the cleaning position, then the stop edge 21 a acts as a driving edge for the (stiff) hinged arm 8 and makes it possible to move the pin 11 past the locking corner 14 a facing the pin, in the direction 35 of FIGS with touching concerns the release edge 18 of the control portion 16 of the arm 8 at the driving edge 21 a, which is also called stop edge. Then, when the pin 11 is sufficiently passed past the locking corner 14a, which does not require that the entire pin must be passed, the stop edge 18 on the handlebar 8 ends and the entrainment function of the stop edge 21a, the support of the movement 35 'also terminate. This short path is sufficient to complete the Entrastvorgang. If after unlocking the pin 11 (Figure 6) now the wing 2 further pivoted in the opening direction, takes the lower edge of the slot 15 with the handlebar, so that he, controlled by the pin 11, participates in the opening movement of the scissors.

A pivoting back of the pin so that he gets back into the catch 14 is effectively prevented by the stop 20. When the pin 11 has at least partially passed the catch 14 according to Figure 7, the wing can be freely pivoted according to the arrow 34 in the cleaning position in which the pin 11 reaches the other end 13 of the slot along the path 35 (Figure 8).

The Eck-shaped notch 18,19 on the side facing the frame side of the free end 16 of the handlebar 8 also allows a backup of the stop 20. Will after the Entrastbewegung by a piecewise swinging back of the arm 7 of the stop 20 from its standby position according to Figure 4 in its driving position as shown in FIG. 3, in the direction of the arrow z, it also acts as a temporary stop, but could be damaged or sheared off by the edge 18 if the pivoting movement is too strong; before this happens, the approximately perpendicular to the edge 18 provided Rücksteuerkante 19 engages the ramp 22nd The user has here an empirically to be determined range of the return pivoting movement, which secures him the Entrastvorgang, but is not forced slavishly comply with this elbow to avoid damage. The stop is self-secured, and the free control of the stop is connected to an automatic return control, if the user wants to initiate the Entrastvorgang too clear and too large a return pivot angle.

The entrainment function can be seen most clearly in Figure 7 , in which not the pin 11 takes over the leadership of the handlebar 8, the pin has rather a small game to steer over the corner 14 a over. During this unlatching movement, the edge 21a of the stop pointing towards the handlebar assumes the guidance of the handlebar at the release edge 18, which can thus also be referred to as a "counterstop". During the unlatching movement, even during a smaller further piece, the two edges 21a, 18 slide against each other in direction 35 ', for controlling the pin 11 in the groove 15, or vice versa.

The path that should be taken along can be determined by geometric considerations. The contact point of the corner 14a and the center of the pin 11 are decisive, whether the pin falls back into the detent 14 or in the groove 15 is controlled. If the point of contact of the corner 14a on the pin 11 so that the extension of the right, lower (inner) edge of the groove 15 extends below the center point of the pin, the pin is securely controlled in the groove 15. Otherwise, the control hooks or is so far endangered that the pin 11 is returned to the detent 14. The controller can also work so that no contact at all of the edge 14a takes place on the pin 11, then in any case a safe outward control is given.

It should be considered in the position of Figure 6 that the stopper 20 is first released or is released, in the direction z, before the pin 11 abuts the left edge of the groove 15. The then taking place, renewed downward movement of the arm 7 triggers the entrainment function 35 ', in which the pin 11 can again remove slightly more of the upper (left) inner edge of the groove 15.

When closing the wing from the cleaning position, the handlebar 8 is initially taken over the pin 11 despite its binding. In this case, its control edge 19 reaches the inclined ramp surface 22 of the limit stop 20 and presses the stop counter to its bias in the prestressed 9, arm 7 is moved upwards in the direction 36 of Figure 9. During the entire subsequent movement up to the closed position, an at least partial overlap is maintained, so that the stop can no longer be impacted during the return pivoting movement of the wing The pin 11 slides past the catch in the direction of the arrow 37 until, in the closed position, it reaches the end 12 of the elongated hole or comes to lie in front of it.

The movement described for Figure 9 is already shown a bit further than the control edge 19, the ramp 22 of the stop begins to touch, which can be represented as shown in Figure 6, but with an upward movement 36 of the local arm 7. Here works the scissors are as in the backup movement of the automatic return control of the stop when the user has inadvertently exaggerated the free-wheeling movement and has too far pivoted the wing back into the tilted position. The return control of the stop according to FIG. 9 takes place in the direction 35 ", through the control edge 19, which is arranged approximately perpendicular to the release edge 18 on the control region 16 of the arm.

In this way, stop and control arm each have two mutually working control edges, the Mitnehmerkante 21a and the release edge 18 in the release of the stop 20 and at a different time or another tilt angle the Rücksteuerkante 19 and the ramp 22 for returning the stop in its standby position , Both pairs of control edges are in each case substantially parallel, but one edge pair 18, 21a is offset by an angle greater than "zero" relative to the other edge pair 22, 19, in this case preferably substantially 90 ° in accordance with FIG.

At the end of the movement, a nose portion 17 engages a fixed stop 17a, which serves as a push-through barrier. Here, the handlebar 8 blocks the further relative movement between the arms 6,7, so that the closed position is uniquely determined and the stopper 20 can not be accidentally released from the right edge of the handlebar.

Both the locking in the securing position, as well as the unlocking on the one hand, and the control of the stop 20 are automatically carried out solely by the movements of the wing in the sense described. The user does not need to make any intervention on the tilt-securing cleaning scissors, which are preferably arranged in two lateral Flügelfalzen. He can therefore always keep the wing firmly under control and control the operations reliably with this handle.

Claims (19)

1. Security scissor linkage for casements (2, 3) of windows which can be tilted between a closed position and a tilted position by a skylight opening device, consisting of two scissor linkage arms (6, 7) which can be attached in the lateral casement gap and are connected to one another in hinged manner and can be connected to the blind frame (1) or to the casement frame (2), and a rod (8) connected in hinged manner to these two scissor linkage arms (6, 7), which rod (8) is connected to the one scissor linkage arm (6) via a non-displaceable hinge (10) arranged at a distance from the scissor linkage hinge (9) and to the other scissor linkage arm (7) via a pin (11) which can be displaced in an elongated hole (15) of the rod (8) and is arranged to be fixed on the other scissor linkage arm (7), wherein a security lock (14) is assigned to this pin (11) in the elongated hole at a distance from both ends (12, 13) of the elongated hole (15), so that in the course of the operational movement, the pin (11) in the elongated hole occupies a first end position in the closed position and a second end position in a cleaning position (αp) of the security scissor linkage, characterised in that starting from a security position (α_S), in which the pin (11) engages into the security lock (14) to transfer the scissor linkage into the cleaning position (α_P), the pin (11) by a relative movement to the rod (8)

   (a) can be unlocked from the security lock (14) and

   (b) at the same time can be locked (20; 21, 22) against renewed engagement in the security lock (14)

   so that it can be moved (18, 19, 35') by limited relative movement counter to the direction of the cleaning position of the scissor linkage arms (6, 7) from the security recess (14) to transfer the scissor linkage into the cleaning position.
2. Scissor linkage according to claim 1, characterised in that the rod (8) can be rotated to be tight in the region of its fixed hinge (10).
3. Scissor linkage according to claim 1 or 2, characterised in that to lock the rod (8) in the unlocked position (50), a stop (20) is provided for the rod (8), and can be moved into a stop-active and a ready position by the rod (8) depending on its pivoting position.
4. Scissor linkage according to claim 3, characterised in that the stop (20, 21) acts as a driver (21 a, 18) only for one pivoting direction, namely in the direction of the cleaning position (α_P).
5. Scissor linkage according to claim 3 or 4, characterised in that the stop (20) is arranged on the scissor linkage arm (7), to which the rod (8) is connected via the pin/elongated hole coupling (11 to 15), in particular is arranged between both scissor linkage arms (7, 6).
6. Scissor linkage according to one of claims 3 to 5, characterised in that the stop (20) is pretensioned resiliently in the direction of its stop-active position.
7. Scissor linkage according to one of claims 3 to 6, characterised in that the rod (8) is designed as a nose (16) controlling the stop (20) between the active position and the ready position in the region of its end facing away from the fixed hinge (10).
8. Scissor linkage according to claim 7, characterised in that the control nose (16) has a control section (17), which releases the stop (20) to occupy its active position in the position (50) corresponding to unlocking.
9. Scissor linkage according to claim 7 or 8, characterised in that the control nose (16) has a counter-stop (18), which, in the active position of the stop (20), cooperates (21 a, 18) with the latter for limited driving away (34) of the rod (8) in the direction of the cleaning position (αp) or for pushing the counter-stop (18) of the rod (8) along (35') the stop (20, 21, 21a).
10. Scissor linkage according to one of claims 7 to 9, characterised in that the control nose (16) has a second control section (19), which, during a movement from the cleaning position in the direction of the closed position, returns the stop (20) to the ready position.
11. Scissor linkage according to one of claims 3 to 10, characterised in that the stop (20) is designed at least in sections as a spring piece with a stop section (21, 21a) and a run-on slope (22), which are orientated offset to one another by an angle greater than zero, in particular essentially by 90°.
12. Scissor linkage according to one of claims 3 to 11, characterised in that the scissor linkage arm (7), on which the stop (20) is formed, has a recess (25) for receiving the stop (20) in its resiliently pretensioned ready position.
13. Scissor linkage according to claim 1, wherein a stop (20; 22) on the scissor linkage arm (7) can be moved into a non-blocking ready position, which the stop does not leave until it reaches the closed position, by a control section (16; 19) on the rod (8) during a return movement from the cleaning position in the direction of the closed position.
14. Operating process of a security scissor linkage according to claim 1, wherein during transfer of the scissor linkage from a security position (α_S) to the cleaning position by a limited movement counter to the direction of the cleaning position (α_P), a stop (20; 21, 22) mounted in a deeper-lying plane is released by the rod (8) in order to automatically occupy a position which lies at the height of the rod (8); and/or during transfer of the scissor linkage from the cleaning position (α_P) in the direction of the tilted position (α_K) or closed position, the stop (20; 21, 22) is moved (19, 22) to its ready position by the rod (8) which is changing its angular position.
15. Process according to claim 14, in which the end of the rod (8) facing away from the rod hinge (10) has a shape (18, 19) which presses the stop (20; 21, 22) back into the deeper-lying plane during a movement of the scissor linkage arms (6, 7) in the direction of the closed position.
16. Process according to claim 14, in which the stop has two sections (21 a, 22) pointing in different angular directions, which can be moved along by the rod (18, 16) from different pivotable bearings, wherein

    - a section (21 a) acts in blocking manner and

    - the second section (22) yields resiliently.
17. Process according to claim 14, wherein a stop section (21, 21a) of the stop (20) is moved back by control of the rod (8).
18. Process according to claim 17, characterised in that the rod (8) returns the stop (20) back to its ready position in the deeper-lying plane during a further movement of the scissor linkage counter to the direction of the cleaning position, that is in the direction of the closed position or tilted position (α_K).
19. Process according to claim 18, wherein the shape of the end is a run-on slope (22) of the stop (20).

Images