AU2020318473B2

AU2020318473B2 - Securing device for securing a position of an angle bracket of a shaft-door threshold of a lift shaft, angle bracket and securing plate equipped therewith, and also method for retrofitting such a securing plate

Info

Publication number: AU2020318473B2
Application number: AU2020318473A
Authority: AU
Inventors: Raphael MEIER
Original assignee: Inventio AG
Current assignee: Inventio AG
Priority date: 2019-07-22
Filing date: 2020-07-10
Publication date: 2024-01-25
Anticipated expiration: 2040-07-10
Also published as: WO2021013588A1; CN114144375A; BR112022000897A2; EP4003893A1; EP4003893B1; CN114144375B; AU2020318473A1

Abstract

The present invention relates to a securing device (102) for securing a position of an angle bracket (108) of a shaft-door threshold (100) of a lift shaft, to an angle bracket (108) and a securing plate (118) having such a securing device (102), and also to a method for retrofitting such a securing plate (118), wherein the securing device (102) has a slotted guide track (112), which is oriented in a direction of action (116), and a perforated plate (114), which can be arranged in the slotted guide track (112) and has a mount (208), which acts in the direction of action (116) and is intended for a screw connection (110) of the angle bracket (108), wherein the perforated plate (114) is shorter than the slotted guide track (112), as seen in the direction of action (116), and the slotted guide track (112) and also the perforated plate (114) each have at least one toothing formation (200), which is oriented in the direction of action (116), wherein the perforated plate (114) can be fixed in the slotted guide track (112) by a form fit between the toothing formations (200).

Description

Securin2 device for securing a position of an an2le bracket of a shaft door sill of an elevator shaft, an an2le bracket equipped therewith and securing plate, and also a method for retrofitting such a securing plate

1. FIELD OF THE INVENTION The present invention relates to a securing device for securing a position of an angle bracket of a shaft door sill of an elevator shaft, an angle bracket for a shaft door sill of an elevator shaft, a securing plate for an angle bracket for a shaft door sill of an elevator shaft and also a method for retrofitting such a securing plate.

2. BACKGROUND OF THE INVENTION A door sill of a shaft door of an elevator can have at least one guide device for guiding at least one door leaf of the shaft door. The door leaf can engage in the guide device and thus can also be guided on a lower edge. The door sill can protrude into an elevator shaft of the elevator and can be fastened to a wall of the elevator shaft using angle brackets. The angle brackets can be screwed to the wall. The angle brackets can be held and positioned on the wall by force-fitting, i.e. in particular by friction due to a tensile force of the screw connection.

To compensate for tolerances, the screw connection can be arranged in an elongated hole in the angle bracket. If the friction between the angle bracket and the wall is too low, the angle bracket can slide off the wall when a force is exerted with a force component acting parallel to the wall until an edge of the elongated hole rests against the screw connection. When the angle bracket slides off, the door sill can also slide off If the door sill has slipped off, the engagement of the door leaf in the guide device can be reduced or eliminated entirely.

There may be a need, inter alia, for an alternative embodiment of a securing device in each case for securing a position of an angle bracket of a shaft door sill of an elevator shaft, an angle bracket for a shaft door sill of an elevator shaft, a securing plate for an angle bracket for a shaft door sill of an elevator shaft and a method for retrofitting such a securing plate. In particular, there may be a need for such components or methods to be designed to enable a high level of security and/or accuracy in the positioning of the angle bracket and/or simple assembly.

3. SUMMARY OF THE INVENTION Such a need may be met by one or more embodiments of a securing device for securing a position of an angle bracket of a shaft door sill of an elevator shaft, an angle bracket for a shaft door sill of an elevator shaft, a securing plate for an angle bracket for a shaft door sill of an elevator shaft and a method for retrofitting such a securing plate according to the various, below-listed aspects of the present invnetion

According to a first aspect of the invention, a securing device for securing a position of an angle bracket of a shaft door sill of an elevator shaft is proposed, wherein the securing device has a gate aligned in one direction of action and a perforated plate that can be arranged in the gate with a receptacle acting in the direction of action for a screw connection of the angle bracket, wherein the perforated plate is shorter in the direction of action than the gate, the gate and the perforated plate each having one or two toothings aligned in the direction of action, wherein the perforated plate can be fixed in the gate by a form fit between the one or two toothings of the perforated plate and the gate, wherein the receptacle is offset in the direction of action by a center offset with respect to a reference line of the toothing of the perforated plate that is aligned transversely with respect to the direction of action, wherein the receptacle can be positioned relative to the reference line in the gate by rotation of the perforated plate, wherein, adjacent to the receptacle, the perforated plate has at least one alternative receptacle for the screw connection, and wherein in the direction of action the alternative receptacle is aligned so that it is offset by an alternative center offset from the reference line.

Editorial note: The term 'Gate' as used herein is a translation of the technical term "Kulisse" as used in the original German version of this specification. The term "Kulisse" may also translate in the context of this specification as 'slotted link' or 'slotted guide'.

According to a second aspect of the invention, an angle bracket for a shaft door sill of an elevator shaft is proposed, wherein the angle bracket has a securing device according to the first aspect of the invention, a wall leg aligned in the direction of action and a support leg for the shaft door sill aligned transversely with respect to the direction of action, wherein the gate of the securing device is designed as a cutout from the wall leg.

Accordingly, an angle bracket is proposed for a shaft door sill of an elevator shaft, wherein the angle bracket comprises a gate aligned in one direction of action for the arrangement of a perforated plate, a wall leg aligned in the direction of action, and a support leg aligned transversely with respect to the direction of action for the shaft door sill, wherein the gate is designed as a cutout from the wall leg, and the gate has at least one toothing aligned in the direction of action, wherein the perforated plate can be fixed in the gate by a form fit between the toothings.

According to a third aspect of the invention, a securing plate for an angle bracket for a shaft door sill of an elevator shaft is proposed, wherein the securing plate comprises the gate of the securing device according to the first aspect of the invention and a stop edge aligned transversely with respect to the direction of action for the angle bracket, wherein the gate of the securing device adjacent to the stop edge is designed as a cutout from the securing plate.

Accordingly, a securing plate for an angle bracket for a shaft door sill of an elevator shaft is proposed, wherein the securing plate has a gate aligned in one direction of action for the arrangement of a perforated plate and a stop edge for the angle bracket aligned transversely with respect to the direction of action, wherein the gate adjacent to the stop edge is designed as a cutout from the securing plate, and the gate has at least one toothing aligned in the direction of action, wherein the perforated plate can be fixed in the gate by a form fit between the toothings.

According to a fourth aspect of the invention, a method is proposed for retrofitting a securing plate according to the third aspect of the invention to an angle bracket of a shaft door sill of an elevator shaft, wherein a screw connection connecting the wall leg of the angle bracket to a wall of the elevator shaft is loosened, the securing plate is applied between the wall leg and the wall with the stop edge pushed against the support leg of the angle bracket, wherein the receptacle of the perforated plate is then aligned with the screw connection and the toothing of the perforated plate is aligned with the toothing of the gate within a tolerance range, wherein the perforated plate is then fully pushed into the gate so that the respective toothings are intermeshed, and wherein the screw connection is screwed together again.

Possible features and advantages of embodiments of the invention can be regarded, inter alia and without limiting the invention, as based upon the concepts and findings described below.

A shaft door sill is understood to mean a lower door sill of a shaft door of an elevator shaft of an elevator. The shaft door sill typically extends along an edge between a floor surface of a story and a vertical wall of the elevator shaft. The shaft door sill can protrude into the elevator shaft. The shaft door sill can substantially fill a gap between a car of the elevator and the edge. The shaft door sill can have a guide device on a floor surface for at least one door leaf of the shaft door. The guide device can comprise one or more grooves for guiding the door or the doors. The shaft door sill can, for example, be a metal profile.

The shaft door sill can be attached to the wall via at least two angle brackets. An angle bracket can be a mounting bracket. The angle bracket can be referred to as a sill support. The angle bracket can be designed to transfer, in particular, a vertical load from the shaft door sill to the wall. The angle bracket can have contact surfaces aligned transversely, in particular at right angles, for screwing to the wall and to the shaft door sill. The contact surfaces can be arranged on legs of the angle bracket. The contact surface for the shaft door sill can be arranged on a support leg of the angle bracket. The contact surface for the wall can be arranged on a wall leg of the angle bracket. The angle bracket can be a welded structure or a stamped and bent part. The wall leg and the support leg can be stiffened by at least one rib.

The screw connection of the angle bracket can comprise at least one screw or at least one stud bolt plus a corresponding nut. At least one washer can be arranged between a screw head of the screw or the nut and the angle bracket. A position of the angle bracket relative to the screw connection can be selected in accordance with the requirements in a direction of action of the angle bracket. The direction of action can substantially correspond to the vertical.

The gate (German:'Kulisse') is typically an elongated aperture in a body. A longer dimension of the gate can be aligned in the direction of action. The gate can typically be a through-opening in a plate or the like.

The perforated plate can have at least one hole as the receptacle for the screw connection. The receptacle can be adapted to a diameter of the thread used, and in particular can be equal to or greater than this. The perforated plate can be arranged in the gate at different positions along the gate. The gate is aligned substantially vertically in the installed state in the elevator shaft. The perforated plate can be held within the gate by the washer of the screw connection. The washer can be larger than the width of the gate. This means that the washer can rest on the side next to the gate.

The toothing(s) of the gate and perforated plate will typically have teeth at regular intervals. The distance between two adjacent teeth is referred to as the tooth pitch. The perforated plate can be inserted into the gate at positions along an axis of the gate predetermined by the teeth. The toothing of the perforated plate has fewer teeth than the toothing of the gate. The toothing has gaps between the teeth. The teeth and gaps can have shapes which are substantially identical or complementary to one another. The toothing of the gate and the toothing of the perforated plate can be shaped substantially identically. The gaps can be shaped in such a way that, for each gap, one tooth of the other toothing can be arranged completely in the gap. In the meshed state, the toothings touch at least at certain points and are thus connected to one another with a form fit. Forces acting in the direction of action can be transmitted from one toothing to the other toothing.

The securing plate can be retrofitted to a conventional angle bracket. A stop edge can be a straight edge of the securing plate. A narrow side of the gate can be arranged adjacent to the stop edge. The securing plate can be pre-positioned at the support (angle) bracket by pushing the stop edge onto the support leg of the bracket. The stop edge can be pushed upward against the support leg. The securing plate can be finally positioned while the toothings of the gate of the securing plate and the perforated plate are meshing fully. In particular, a small gap can occur between the stop edge and the support leg during the final positioning. The width of the gap can be smaller than a tolerance range.

The receptacle can be offset in the direction of action by a center offset with respect to a reference line of the toothing of the perforated plate that is aligned transversely with respect to the direction of action. The receptacle can be positioned relative to the reference line in the gate by rotation of the perforated plate. The reference line can be aligned at right angles to the direction of action. The reference line can correspond to a center line of a tooth or a gap in the toothing. A center offset can be a distance between a center line of the receptacle that is aligned transversely with respect to the direction of action and the reference line. The perforated plate can be inserted into the gate in a first alignment. Likewise, the perforated plate can be inserted into the gate in a second alignment rotated by 180° about the reference line. From the first alignment to the second alignment there is an overall offset of the receptacle which substantially corresponds to twice the center offset.

In accordance with all aspects of the invention, adjacent to the receptacle, the perforated plate has at least one alternative receptacle for the screw connection. In the direction of action, the alternative receptacle is aligned so that it is offset by an alternative center offset with respect to an, in particular, adjacent alternative reference line. With two differently arranged receptacles at the perforated plate, the screw connection can be accommodated in four different positions by rotation and/or turning of the perforated plate. To use the alternative receptacle, the toothing of the perforated plate can be engaged in another position.

The center offset can be one eighth of a tooth pitch of the toothing. The total offset when the perforated plate is rotated and/or turned is therefore a quarter of the tooth pitch, for example two millimeters with a tooth pitch of eight millimeters. The alternative center offset can be three eighths of the tooth pitch. The total offset when the perforated plate is rotated and/or turned is therefore three-quarters of the tooth pitch, for example six millimeters with a tooth pitch of eight millimeters. By a change to the locking position, the total offset is then an integral multiple of the tooth pitch.

The perforated plate is configured to be rotated and/or turned relative to the gate for alignment of the toothings. When the position of the axis of the screw connection is fixed, the toothing of the perforated plate can be aligned by rotation about this axis and/or turning so that it is aligned as well as possible, i.e. with no or little offset, with respect to the toothing of the securing plate resting on the angle bracket. In the case of one-sided toothing of the gate and the perforated plate, the perforated plate can be put into an individual latching position of the gate by turning it into two alignments. In the case of a receptacle with a center offset with respect to the reference line of this latching position, this results in two different positions of the perforated plate relative to the axis. If there are several receptacles per perforated plate, each with a different center offset with respect to the reference line or relevant different reference lines, the possible positions of the perforated plate are multiplied. By selecting the most suitable receptacle, latching position and alignment for the perforated plate, the toothings can be almost completely aligned with one another.

The securing plate can have an alternative stop edge for the angle bracket. The gate can be arranged eccentrically in the direction of action between the stop edges. In particular, a center between the stop edges can be arranged within the gate. The alternative stop edge can be arranged on a side of the securing plate opposite the stop edge. An adjustment range of the gate can be selected by rotating the securing plate relative to the angle bracket. Due to an eccentric arrangement of the gate, the adjustment range of the securing plate can be almost doubled in the case of a compact gate without causing a weakening of the securing plate.

The securing plate is configured so it can be rotated and/or turned around relative to the angle bracket to select an adjustment range of the gate. The adjustment range can be preselected before the perforated plate is aligned with the axis of the screw connection.

In one embodiment, the gate and the perforated plate can have a further toothing opposite the aforementioned toothing and which second toothing is also aligned in the direction of action. The further toothing provides additional contact points for transmitting forces between the perforated plate and the securing plate. A contact area can also be enlarged. A symmetrical introduction of force can be achieved with the two toothings.

The toothing and the further toothing can be offset from one another by half a tooth pitch in the direction of action. The toothing can start with one tooth, for example, while the further toothing begins with a gap. By rotation or turning of the perforated plate, a new latching position offset by half the tooth pitch can be achieved. By offsetting the toothing on the perforated plate, several perforated plates can be cut off from a strip of continuous material by a separating cut that forms the toothing. In this way, any stamping waste can be reduced. With a two-sided and offset toothing of the gate and the perforated plate, the perforated plate can be inserted in two alignments in two locking positions of the gate which are offset by half the tooth pitch. The possible positions of the perforated plate are multiplied in order to align the toothings with one another.

The center offset of one receptacle can be 1/16 of the tooth pitch. The alternative center offset of the alternative receptacle can be 3/16 of the tooth pitch. In combination, rotation and turning of the perforated plate results in eight possibilities for positioning one of the receptacles of the perforated plate within a tooth pitch. The eight possibilities are regularly distributed over a tooth pitch.

The toothing can be designed as a tight-fitting toothing. The toothings of the gate and the perforated plate can be of the same or opposite type. The toothing can be designed as a circular arc toothing with semicircular arcs adjacent to one another. A notch effect of the toothing can be minimized by means of arcuate tooth tips and tooth roots.

The receptacle can be designed as an elongated hole aligned transversely with respect to the direction of action. The receptacle can have a stop surface for the screw connection that is aligned transversely with respect to the direction of action. Because it is designed as an elongated hole, the axis of the screw connection can be shifted transversely with respect to the direction of action within a tolerance range. The assembly can be simplified by the elongated hole.

It should be noted that some of the possible features and advantages of the invention are described herein with reference to different embodiments of the securing device, the angle bracket and/or the securing plate, on the one hand, and the method for retrofitting a securing plate, on the other hand. A person skilled in the art recognizes that the features can be transferred, combined, adapted or replaced in a suitable manner in order to arrive at further embodiments of the invention.

Embodiments of the invention are described below with reference to the attached drawings, and neither the drawings nor the description are to be regarded as restrictive. 4. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1: is a representation of a shaft door sill with securing devices according to one embodiment; Fig. 2a: is a representation of a securing plate according to one embodiment;

Fig. 2b: is a representation of a perforated plate for a securing device according to one embodiment; and Fig. 3a to 3e: show a sequence of a method for retrofitting a securing plate according to one embodiment.

The drawings are merely schematic and not true to scale. Like reference signs denote like or equivalent features in the various drawings.

5. DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS Fig. 1 shows an illustration of a shaft door sill 100 with securing devices 102 according to an embodiment. The shaft door sill 100 is arranged in an elevator shaft on an edge between a wall 104 of the elevator shaft and a floor surface 106 of a story. The shaft door sill 100 is attached to the wall 104 using two angle brackets 108.

Each angle bracket 108 is screwed to the wall 104 via a screw connection 110. The screw connection 110 here consists of an anchor bolt recessed into the wall 104 with a thread protruding out of the wall 104. The anchor bolt can be glued into the wall 104, for example. A washer is placed onto each thread and a nut is screwed on. When the screw connection 110 is tightened, a fictional connection is created between the wall 104 and the angle bracket 108.

The angle brackets 108 each have two legs which are aligned approximately at right angles to one another and are stiffened by a rib aligned approximately at right angles to both legs. The leg arranged on the wall 104 can be referred to as a wall leg. The leg resting on the shaft door sill 100 can be referred to as a support leg.

A securing device 102 is arranged on the wall leg of each angle bracket 108. By means of a form fit the securing device 102 prevents the angle bracket 108 from sliding off the wall 104.

The securing device 102 has a gate 112 coupled to the angle bracket 108 and a perforated plate 114 coupled to the screw connection 110. The gate 112 is aligned in a direction of action 116 of the securing device 102. The direction of action 116 here substantially corresponds to a vertical direction. There is a form fit between the gate 112 and the perforated plate 114. The perforated plate 114 and the gate 112 cannot be displaced relative to one another in the installed state, at least in the direction of action 116.

Here the securing device 102 is part of a separate securing plate 118. The gate 112 is a slot-shaped cutout from the securing plate 118 and is aligned in the direction of action 116. The securing plate 118 is clamped between the wall leg and the washer. The perforated plate 114 is arranged in the gate 112 and is also clamped between the wall leg and the washer. The wall leg clamped between the securing plate 118 or the perforated plate 114 and the wall 104 has an elongated hole aligned in the direction of action 116 for the screw connection 110. A stop edge of the securing plate 118 can rest against the support leg of the angle bracket 108 in order to produce the form fit to the angle bracket 108.

As an alternative to this, the securing device 102 can also be part of the angle bracket 108. The gate 112 is then a cutout from the wall leg. The perforated plate 114 is then arranged between the wall 104 and the washer in the gate 112.

The perforated plate 114 is shorter in the direction of action 116 than the gate 112. The gate 112 and the perforated plate 114 are each designed to be meshed so as to match. The perforated plate can therefore be arranged in different positions in the gate 112 that are predetermined by the toothing. The positions are offset from one another in the direction of action 116.

The perforated plate 114 is guided via a receptacle at least in the direction of action 116 on the screw connection 110. The receptacle is covered by the washer. The receptacle can be designed, for example, as a hole in the perforated plate 114 that is adapted to a diameter of the anchor bolt. When the perforated plate 114 is fitted onto the anchor bolt, the position of the receptacle is fixed at least in the direction of action 116 by a form fit.

Fig. 2a shows an illustration of a securing plate 118 according to an embodiment. The securing plate 118 substantially corresponds to one of the securing plates in Fig. 1. The gate 112 is designed as a substantially right-angled cutout from the securing plate 118. Both side surfaces of the gate 112 aligned in the direction of action 116 have a toothing 200 here.

In an embodiment that is not shown, only one side surface of the gate 112 is toothed.

The side surfaces of the securing plate 118 that are aligned transversely with respect to the direction of action 116 are the stop edges 202 of the securing plate 118. The gate 112 is arranged between the stop edges 202.

In one exemplary embodiment, the gate 122 is arranged eccentrically between the stop edges 202. In this case, a center 204 is arranged between the stop edges 202, but within the gate 112.

In one embodiment, the toothings 200 of the two side surfaces are arranged offset from one another by half a tooth pitch 206 in the direction of action 116. Due to this offset, the perforated plate can be inserted into the gate 112 in different latching positions by turning it around an axis aligned in the direction of action 116, the latching positions being offset from one another in each case by half the tooth pitch 206. The number of latching positions can be effectively doubled by the offset by half the tooth pitch 206. Likewise, the perforated plate can be rotated by 1800 in a plane of the securing plate 118 in order to reach the latching position offset by half the tooth pitch 206.

Fig. 2b shows an illustration of a perforated plate 114 for a securing device according to an embodiment. The perforated plate 114 corresponds substantially to one of the perforated plates in Fig. 1. The perforated plate 114 is substantially rectangular. The two opposing side surfaces that are aligned in the direction of action 116 have a toothing 200. The toothings 200 of the gate 112 and the perforated plate 114 are opposite.

In an embodiment that is not shown, only one of the side surfaces has a toothing 200.

The perforated plate 114 has at least one receptacle 208. The receptacle 208 is a through hole. The receptacle 208 is dimensioned according to the screw connection.

In one embodiment, the receptacle 208 is designed as an elongated hole aligned transversely with respect to the direction of action 116.

In one embodiment, the receptacle 208 has a center offset 210 with respect to a reference line 212 of the toothing. The reference line 212 here runs perpendicular to the direction of action 116 along a virtual axis of symmetry of the toothing 200. The virtual axis of symmetry of the toothing 200 is either a center line of a tooth or a gap in the toothing 200. By turning of the perforated plate 114 about the axis of symmetry, the receptacle 208 can be displaced by twice the center offset 210 with respect to the reference line 212.

In one embodiment, the toothings 200 of the two side surfaces are arranged offset from one another by half a tooth pitch 206 in the direction of action 116. By rotation of the perforated plate about an axis aligned in the direction of action 116, the receptacle 208 can be displaced by half a tooth pitch 206.

In one embodiment, the perforated plate 114 has an alternative receptacle 214. Either the receptacle 208 or the alternative receptacle 214 can be aligned with the screw connection. The alternative receptacle 214 has an alternative center offset 216 with respect to another reference line 212. By turning of the perforated plate 114 about the axis of symmetry, the alternative receptacle 214 can be displaced by twice the alternative center offset 216 with respect to the other reference line 212.

In one embodiment, the toothings of the gate 112 and the perforated plate 114 are designed as a circular arc toothing or tight-fitting toothings. The teeth and troughs are rounded in a circular arc. Due to the design without sharp-edged transitions between the teeth and troughs, the troughs have a low notch effect.

Fig. 3a to 3e show a sequence of a method for retrofitting a securing plate 118 according to one embodiment. The securing plate 118 corresponds substantially to the securing plate in Fig. 2a.

A conventional angle bracket 108 with an elongated hole 300 aligned in the direction of action 116 is shown in Fig. 3a. As in Fig. 1, the angle bracket 108 is connected to a shaft door sill 100. A threaded bolt 302 of the screw connection 110 is arranged in the elongated hole 300. The threaded bolt 302 is anchored in the wall 104. A nut 304 screwed onto the threaded bolt 302 is loosened and a washer 306 arranged between the nut 304 and the wall leg of the angle bracket 108 is removed.

In Fig. 3b, the securing plate 118 is arranged on the wall leg in such a way that the threaded bolt is arranged within the gate 112.

In Fig. 3c, the securing plate 118 is rotated about the threaded bolt 302 in such a way that a stop edge 202 of the securing plate 118 can rest against the support leg of the angle bracket 108 and the threaded bolt 302 is at a required distance from the edge of the gate 112. Then the stop edge 202 is pushed against the support leg.

In Fig. 3d, one of the receptacles 214 of the perforated plate 114 is pushed over the threaded bolt 302 and tests are performed to ascertain whether the toothings 200 are aligned relative to one another within a tolerance range. If the toothings are not aligned relative to one another within the tolerance range, the perforated plate 114 is rotated about the threaded bolt 302 and, alternatively or additionally, the perforated plate 114 is removed from the threaded bolt 302 and the other receptacle 208 is tried and, alternatively or additionally, the perforated plate 114 is removed from the threaded bolt 302 and turned onto the back face.

By rotation, turning and/or changing of the receptacles 208, 214, the toothing 200 of the perforated plate 114 is displaced relative to the toothing 200 of the gate 112. When the toothings 200 are aligned with one another within the tolerance range, the perforated plate 114 is inserted into the gate 112 and the form fit between the toothings 200 is established. The stop edge of the securing plate 118 can be removed from the support leg by a maximum of the tolerance.

In Fig. 3e the washer 306 is put back onto the threaded bolt 302 and the nut 304 is screwed back onto the threaded bolt 302 and tightened with the intended torque. The securing plate 118 and the perforated plate 114 are clamped between the washer 306 and the wall leg. The angle bracket 108 or the shaft door sill 100 can now slide by a maximum of the tolerance in the direction of action 116 until the form fit between the support leg and the stop edge prevents further sliding.

In other words, retrofitting of a shaft door sill support securing device is shown in Fig. 3a to 3e. Existing systems can be retrofitted in this way. The shaft door sill support securing device can be installed quickly and easily, is form-fitting and still adjustable.

By attachment of an additional securing plate with toothing, a form-fitting connection is achieved between the existing anchor bolt and the sill bracket. The sill bracket is supported on the plate and therefore can no longer sink downwards.

Due to the tooth pitch of 8 mm and the resulting offset arrangement of the toothing by, for example, four millimeters and the eccentric arrangement of the holes by, for example, two millimeters, there are four possibilities for adjustment by turning and rotation of the perforated plate. The perforated plate can be adjusted to the existing anchor bolt in steps of, for example, two millimeters.

Finally, it should be noted that terms such as "comprising," "having," etc. do not preclude other elements or steps, and terms such as "a" or "an" do not preclude a plurality. Furthermore, it should be noted that features or steps which have been described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims should not be considered to be a restriction.

Claims

1. A securing device for securing a position of an angle bracket of a shaft door sill in an elevator shaft, comprising: a gate aligned in a direction of action of the anngle bracket, and a perforated plate configured to be arranged within the gate and having a receptacle acting in the direction of action for a screw connection of the angle bracket, wherein the perforated plate is shorter in the direction of action than the gate, wherein the gate and the perforated plate each have a first toothing aligned in the direction of action, wherein the perforated plate is configured to be fixed in the gate by form fit intermeshing of the two first toothings, wherein the receptacle is offset in the direction of action by a center offset with respect to a reference line of the first toothing of the perforated plate that is aligned transversely with respect to the direction of action, wherein the receptacle can be positioned relative to the reference line in the gate by rotation of the perforated plate, wherein, adjacent to the receptaclein the direction of action, the perforated plate has at least one alternative receptacle for the screw connection, and wherein, in the direction of action, the alternative receptacle is aligned so that it is offset by an alternative center offset from the reference line.

2. The securing device according to claim 1, wherein the center offset is one eighth of a tooth pitch of the two first toothings, and/or the alternative center offset is three eighths of the tooth pitch.

3. The securing device according to claim 1 or 2, wherein the gate and the perforated plate have a second toothing opposite the first toothing, the second toothings also being aligned in the direction of action.

4. The securing device according to claim 3, wherein the first toothings and the second toothings are offset from one another by half a tooth pitch.

5. The securing device according to claim 3 or 4, wherein one or both the first and second toothings provide a tight-fitting toothing.

6. The securing device according to any one of the preceding claims, wherein the receptacle of the perforated plate is an elongated through-hole aligned transversely with respect to the direction of action.

7. The securing device according to any one of claims I to 6, wherein the gate is formed as a substantially right-angled cutout in a securing plate, with opposing side surfaces of the cutout aligned in the direction of action, and wherein the first toothing is formed in one of the opposing side surfaces and the second toothing, where present, is formed in the other one of the opposing side surfaces.

8. The securing device according to claim 7, wherein the securing plate has a stop edge for the angle bracket that is aligned transversely with respect to the direction of action.

9. The securing device according to claim 8, wherein the securing plate has an alternative stop edge for the angle bracket that is on an opposite side of the securing plate in the direction of action and is also aligned transversely with respect to the direction of action, wherein the gate is arranged eccentrically in the direction of action between the stop edge and the alternative stoop edge, wherein a center point between the stop edges locates within the gate, and wherein an adjustment range of the gate can be selected by rotating the securing plate relative to the angle bracket.

10. An angle bracket for a shaft door sill of an elevator shaft, comprising a wall leg configured to be placed against a wall of the elevator shaft in an about vertical orientation, a support leg extending approximately perpendicular to the wall leg and configured to support the shaft door sill, and a securing device according to any one of claims 1 to 6, wherein the gate is designed as a cutout in the wall leg and extends in the direction of action.

11. A method for retrofitting an angle bracket supporting a shaft door sill of an elevator shaft, comprising the following steps: - providing a securing device according to any one of claims 7 to 9;

- loosening an existing screw connection connecting a wall leg of the angle bracket to a wall of the elevator shaft; - placing the securing plate of the securing device on the wall leg with part of the screw connection extending through the guide and with one of the stop edges of the securing plate pushed against a support leg of the angle bracket at which the shaft door still is supported; - pushing one of the receptacles of the perforated plate in aligned manner over the part of the screw connection extending through the securing plate; - determining whether or not the toothing of the perforated plate of the securing device is aligned within a tolerance range with the toothing of the gate of the securing plate; - where alignment within the tolerance range is deteremined, pushing the perforated plate along the part of the screw connection fully into the gate to cause the respective toothings to form-fittingly intermesh; and - re-establishing the full screw connection.

12. The method according to claim 11, wherein the screw connection comprises an anchor bolt recessed into and secured to a side wall of the elevator shaft with its thread protruding from the wall, and a removable nut.

13. The method according to claim 11 or 12, wherein where no alignment within the tolerance range is deteremined, an adjustment stage is performed in that - the perforated plate is rotated relative to the gate, - alternatively or additionally, the perforated plate is removed from the part of the thread conection and the other one of the receptacles of the perforated plate is pushed in aligned manner over the part of the screw connection extending through the securing plate, - alternatively or additionally, the perforated plate is removed, turned onto its back face and replaced onto the part of the threaded conection, wherein alignment of the respective toothings within the tolerance range is re-checked at each such adjustment stage, and wherein pushing the perforated plate along the part of the screw connection fully into the gate is only effected where such alignment is determined.

14. The method according to any of claims 11 to 13, wherein the securing plate is rotated and/or turned relative to the angle bracket in order to select an adjustment range of the gate.

112 110 118 116

106

114 108

102

104

102

112110 118 116

100

114 108

Fig. 1

Fig. 2a 202 116

118

112

206 200

200 204

202

Fig. 2b 114 116 200

208 206 212 210

200 216

Fig. 3a

116 100

108 302 306 110 300

304 0

104

O Fig. 3b

116 100

112 302

108

Fig. 3c 202 202

112

302 302 1

112

118 118

Fig. 3d

116 100

200 102 112 302 200 208 108 200 214 200

114

Fig. 3e

116 100

108 302 306 114

304

118