EP0097733A1 - Lockable step-stool - Google Patents

Lockable step-stool Download PDF

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Publication number
EP0097733A1
EP0097733A1 EP82105736A EP82105736A EP0097733A1 EP 0097733 A1 EP0097733 A1 EP 0097733A1 EP 82105736 A EP82105736 A EP 82105736A EP 82105736 A EP82105736 A EP 82105736A EP 0097733 A1 EP0097733 A1 EP 0097733A1
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EP
European Patent Office
Prior art keywords
articulated
axis
tread
guide
pawl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82105736A
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German (de)
French (fr)
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EP0097733B1 (en
Inventor
Friedrich Ing. Ruschitzka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Friedrich Ruschitzka Metallwarenfabrik
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Friedrich Ruschitzka Metallwarenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Friedrich Ruschitzka Metallwarenfabrik filed Critical Friedrich Ruschitzka Metallwarenfabrik
Priority to AT82105736T priority Critical patent/ATE13331T1/en
Priority to DE8282105736T priority patent/DE3263519D1/en
Priority to EP82105736A priority patent/EP0097733B1/en
Publication of EP0097733A1 publication Critical patent/EP0097733A1/en
Application granted granted Critical
Publication of EP0097733B1 publication Critical patent/EP0097733B1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C12/00—Step-stools
    • A47C12/02—Step-stools requiring conversion between the step and seat functions
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/387—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders having tip-up steps

Definitions

  • the invention relates to a step stool, which consists of a riser, in which treads are articulated in pivot axes, which are articulated by at least one guide strut, and a support leg articulated on the riser, on which at least one tread is articulated.
  • Such step stools are known from the German utility model G 81 21 831.1 and G 81 21 83 0 .3 of the applicant.
  • Such a generic step stool is disclosed in particular in the last-mentioned utility model G 81 21 83 0 .3.
  • the upper support bars of the support leg protrude above the articulation points thereof on the riser; the ends of these upper support bars hold a guide axis which is slidably mounted in a slide bearing of the upper tread. If such a step stool is unfolded, this guide axis is moved in the slide bearing up to the stop on the front edge of the upper step surface. Then the upper tread is approximately horizontal, as is the lower tread, which is held in a position corresponding to the parallelogram by the guide struts.
  • the guide axis in the slide bearing of the upper tread is pushed back to the upper pivot axis of the upper tread.
  • the upper tread between the riser and the support leg can pivot down about the upper pivot axis, so that comes to lie parallel to the riser and the support leg, the support leg then also lying parallel to the riser. Accordingly, the lower step surface is moved by the guide struts.
  • step stool still has disadvantages. If you grab e.g. such a well-known step stool in the unfolded state on the riser, he tries to fold up by himself. This is due on the one hand to the fact that the support leg wants to fold against the riser by its own weight, but this then triggers the folding movement; on the other hand, however, at the same time try to fold down the treads and thus press the guide axis in the slide bearing against the upper swivel axis. Very exceptionally, it is also possible that such a known step also folds up when the step surfaces are only loaded on their outermost front edges, that is to say on the edges which are located away from the pivot axes.
  • the slide bearing is susceptible to wear and especially when operated by children of such a step stool with slide bearing strands there is a risk that these fingers get caught in it.
  • the present invention has for its object to provide a step stool of the generic type, which in the extended state neither by itself when lifting nor collapses when the load is uneven; in addition, plain bearings should no longer be used if possible because of the aforementioned disadvantages.
  • a stool of the aforementioned type in that at least one. on the support leg articulated step surface is rotatably arranged on this in a guide axis via hinge arms; the hinge arms, in turn, are hinged to the ends of the upper support bars in a respective pivot axis.
  • a pawl is rotatably arranged on at least one oscillation axis and has a special angular elongated hole. In this angular elongated hole, the swivel axis belonging to the same lies in the folded-out position of the step surface for locking.
  • the angular elongated hole is called an angular elongated hole because it has the shape of an ordinary elongated hole, but which has an angled additional elongated hole at one end.
  • the angle of the elongated hole lies at the end of the pawl opposite the guide axis.
  • the guide axis comes to rest in the angular hole of the angular elongated hole and is locked there, as it were.
  • the distance between the guide axis and the oscillation axis is rigidly held in the pawl in this state.
  • the step stool according to the invention since when the step stool according to the invention is folded, the oscillating axis inevitably moves towards the guide axis, the step stool collapsing when the guide axis is locked. Thus, a secure lock is created so that the stool neither when lifting collapses on the riser even when the load is uneven, especially on the foremost parts of the treads. But if you want to fold the stool, you only have to lift the pawl a little so that the guide axis gets out of the angled hole into the actual elongated hole. Now the pawl can move freely in the elongated hole in accordance with the movement of the swing axis when folded on the guide axis; So the swing axis can move towards the guide axis.
  • step stool in other step stools, it is expedient to distribute the load as far as possible on both sides. This can also be achieved by providing one of the pawls according to the invention on each side of the step stool. However, this is not so practical since the user then needs both hands when operating the stool to operate the pawls.
  • hinge arms have stop surfaces projecting beyond the swing axes to the upper support spars for abutment against the upper support spars when the tread surface is unfolded.
  • stop surfaces When loaded, these stop surfaces then absorb compressive forces which they transmit to the upper support bars. These stop surfaces thus prevent the hinge arms from folding over beyond the upper support spars further than desired. This also relieves the pawl, so that you can use an ordinary, thin, punched sheet for the pawl. Because the pawl only has the function of keeping the step stool in the unfolded state, where only low forces occur.
  • the step stool is first formed by the riser 1.
  • the riser 1 has the uprights 2 running on both sides; these risers 2 are divided by the central axes 6 into the upper risers 2a and the lower risers 2b.
  • the central axes 6 serve to link the support leg 11.
  • the support leg 11 is in turn also formed by the support bars.
  • the support bars are again divided by the central axes 6 into the upper support bars 11b and the lower support bars 11a.
  • a step stool with two step surfaces 4 and 5 is shown.
  • the upper step surface 4 is articulated in a known manner via the swivel axis 13 in the climbing bars 2 of the climbing leg 1.
  • the lower step surface 5 is articulated in the risers via the lower pivot axis 16.
  • the upper tread 4 and the lower tread 5 turn from the guide struts 15 together with the upper tread 4.
  • these guide struts 15 are articulated on the treads in the region of the front edge of the treads.
  • the treads have flanged edges, that is to say sections flanged downwards.
  • 4a is the flanged edge of the upper tread
  • 5a is the flared edge of the lower tread.
  • Such treads are usually made of sheet metal, the edge of which can easily be flanged downwards. This edge then serves with corresponding bores for articulating or mounting the axles and guide struts.
  • the lower tread surface 5 is supported by the lower pivot axis 16 in the risers as well as the upper tread surface 4 in the upper pivot axis 13.
  • the upper support spar 11b is not rigid; instead, it is cranked prematurely and a separate hinge arm 8 is placed on it.
  • This hinge arm 8 has an approximately U-shaped profile, in the Cutout of the upper support beam 11b fits.
  • the upper support bar 11b supports this hinge arm 8 at its end in the oscillation axis 3.
  • the hinge arm 8 can thus rotate about this oscillation axis 3 towards the lower tread surface 5.
  • the guide axis 7 for the upper tread surface 4 is mounted on the end of the hinge arm 8 which is more distant from the upper support beam 11b.
  • the guide axis 7 is mounted in the flange 4a of the upper tread. Of course, it is not absolutely necessary for this guide axis 7 to be continuous; short pieces of guide axis up to the flange edge 4a of the upper tread on both sides of the hinge arms 8 are also sufficient. The same applies to the swivel axes.
  • a pawl 9 according to the invention is now arranged on one oscillation axis 3. In the figure shown, however, it is largely covered by the upper step surface 4. Nevertheless, the angular elongated hole 14 can be clearly seen, in the angular hole 17 of which the upper pivot axis 13 is engaged in the unfolded state.
  • the pawl 9 is mounted on the swing axis 3 and has a pawl nose 10 at the free end, on which it can be easily operated. As shown, the angled hole 17 is located at one end of the angled longitudinal hole, which is located away from the central axis 6.
  • FIG. 3 the Rear view, that is to say from viewing direction B in FIG. 1, of the detail according to FIG. 2.
  • the step stool is shown in its fully folded state. Accordingly, the upper tread surface 4 is flush with the S dough leg and the support leg or the corresponding bars.
  • the pawl 9 is articulated on the oscillation axis 3 and lies above the upper pivot axis 13;
  • the oblong slot 14 is of course not shown in this perspective. Only the latch nose 11 can still be distinguished.
  • the swing axis 3 also passes through the hinge arm 8 and the end of the upper support beam 11b.
  • This central axis 6 is spaced between the lower support beam 11a and the lower climbing beam 2b by a conventional spacer sleeve 19 on this central axis 6.
  • the flanged edge 4a of the upper tread 4 is shown in this figure only as an ordinary line. This flanged edge 4a is drilled through for mounting the upper pivot axis 13 and the guide axis 7.
  • the inside of the upper riser 2a is drilled for receiving and articulating the upper pivot axis 13; the same applies to the central axis 6.
  • the guide strut 15 is also articulated in a known manner in the flange 4a in a suitable bore, as can be clearly seen in FIG.

Abstract

1. A step stool comprising an upright arm (1), to which tread surfaces (4, 5) are articulated by pivot spindles (13, 16), which tread surfaces are linked together by at least one guide strut (15), and articulated to the upright arm (1) a support arm (11) to which at least one of the tread surfaces (4) is articulated by means of a guide spindle (7), characterised in that the at least one tread surface (4) articulated to the support arm (11) is arranged rotatably to the guide spindle (7) on the support arm via hinge arms (8) which are foldably mounted at the ends of the upper support bars (11b) of the support arm (11) by a respective swing pivot (3), and in that a pawl (9) is rotatably mounted on at least one swing pivot (3), in the angled slot (14) of which pawl, for locking in the swung-out position of the tread surface (4), lies the pivot spindle (13) associated with this tread surface and with the upright arm (1).

Description

Die Erfindung betrifft einen Tritthocker, der aus einem Steigschenkel besteht, in dem in Schwenkachsen Trittflächen angelenkt sind, die von wenigstens einer Führungsstrebe zusammengelenkt sind, und einem an dem Steigschenkel angelenkten Stützschenkel, an dem wenigstens eine Trittfläche angelenkt ist.The invention relates to a step stool, which consists of a riser, in which treads are articulated in pivot axes, which are articulated by at least one guide strut, and a support leg articulated on the riser, on which at least one tread is articulated.

Solche Tritthocker sind aus dem deutschen Gebrauchsmustern G 81 21 831.1 und G 81 21 830.3 des Anmelders bekannt. Insbesondere in dem zuletzt genannten Gebrauchsmuster G 81 21 830.3 ist ein solcher, gattungsgemäßer Tritthocker offenbart. Dabei stehen die oberen Stützholme des Stützschenkels über die Anlenkpunkte desselben an dem Steigschenkel hervor; die Enden dieser oberen Stützholme halten eine Führungsachse, die in einem Gleitlager der oberen Trittfläche verschiebbar liegt. Wird ein solcher Tritthocker auseinandergeklappt, so wird diese Führungsachse in dem Gleitlager bis zum Anschlag am vorderen Rand der oberen Trittfläche verschoben. Sodann steht die obere Trittfläche ungefähr waagrecht, gleichfalls die untere Trittfläche, die in einer parallelogrammmäßig -entsprechenden Stellung von den Führungsstreben gehalten wird. Im zusammengeklappten Zustand hingegen wird die Führungsachse in dem Gleitlager der oberen Trittfläche bis zu der oberen Schwenkachse der oberen Trittfläche zurückgeschoben. Infolgedessen kann die obere Trittfläche zwischen dem Steigschenkel und dem Stützschenkel um die obere Schwenkachse herunterschwenken, so daß parallel zum Steigschenkel und dem Stützschenkel zum Liegen kommt, wobei der Stützschenkel seinerseits ebenfalls parallel zum Steigschenkel dann liegt. Ertsprechend wird durch die Führungsstreben die untere Trittfläche bewegt.Such step stools are known from the German utility model G 81 21 831.1 and G 81 21 83 0 .3 of the applicant. Such a generic step stool is disclosed in particular in the last-mentioned utility model G 81 21 83 0 .3. The upper support bars of the support leg protrude above the articulation points thereof on the riser; the ends of these upper support bars hold a guide axis which is slidably mounted in a slide bearing of the upper tread. If such a step stool is unfolded, this guide axis is moved in the slide bearing up to the stop on the front edge of the upper step surface. Then the upper tread is approximately horizontal, as is the lower tread, which is held in a position corresponding to the parallelogram by the guide struts. In the folded state, however, the guide axis in the slide bearing of the upper tread is pushed back to the upper pivot axis of the upper tread. As a result, the upper tread between the riser and the support leg can pivot down about the upper pivot axis, so that comes to lie parallel to the riser and the support leg, the support leg then also lying parallel to the riser. Accordingly, the lower step surface is moved by the guide struts.

Ein solcher bekannter Tritthocker hat aber noch Nachteile. Ergreift man z.B. einen solchen bekannten Tritthocker im ausgeklappten Zustand am Steigschenkel, so versucht er, von selbst zusammenzuklappen. Dies wird zum einen dadurch bedingt, apß der Stützschenkel durch sein Eigengewicht gegen den Steigschenkel klappen möchte, wodurch dann aber die Zusammenklappbewegung ausgelöst wird; zum anderen aber versuchen gleichzeitig die Trittflächen ebenfalls nach unten zu klappen und so die Führungsachse im Gleitlager gegen die obere Schwenkachse zu drücken. Ganz ausnahmsweise ist es weiterhin möglich, daß ein solcher bekannter Tritt aber auch dann zusammenklappt, wenn die Trittflächen nur auf ihren äußersten vorderen Rändern belastet werden, also auf den Rändern, die von den Schwenkachsen entfernt liegen. Dadurch wird nämlich auf die Führungsachse in dem Gleitlager eine Kraft ausgeübt, wie sie auch beim Anheben des unbelasteten Tritthockers wirkt. Ferner ist das Gleitlager verschleißanfällig und gerade bei der Bedienung durch Kinder eines solchen Tritthockers mit Gleitlager-Flitzen besteht die Gefahr, daß diese sich Finger darin einklemmen.However, such a known step stool still has disadvantages. If you grab e.g. such a well-known step stool in the unfolded state on the riser, he tries to fold up by himself. This is due on the one hand to the fact that the support leg wants to fold against the riser by its own weight, but this then triggers the folding movement; on the other hand, however, at the same time try to fold down the treads and thus press the guide axis in the slide bearing against the upper swivel axis. Very exceptionally, it is also possible that such a known step also folds up when the step surfaces are only loaded on their outermost front edges, that is to say on the edges which are located away from the pivot axes. As a result, a force is exerted on the guide axis in the slide bearing, as it also acts when lifting the unloaded step stool. Furthermore, the slide bearing is susceptible to wear and especially when operated by children of such a step stool with slide bearing strands there is a risk that these fingers get caught in it.

Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Tritthocker der gattungsgemäßen Art zu schaffen, der im ausgeklappten Zustand weder von selbst beim Anheben noch bei ungleichmäßiger Belastung zusammen klappt; außerdem sollen Gleitlager möglichst nicht mehr zur Anwendung kommen, wegen der vorgenannten Nachteile.In contrast, the present invention has for its object to provide a step stool of the generic type, which in the extended state neither by itself when lifting nor collapses when the load is uneven; in addition, plain bearings should no longer be used if possible because of the aforementioned disadvantages.

Diese Aufgabe wird nun erfindungsgemäß bei einem Hocker der vorgenannten Gattung dadurch gelöst, daß wenigstens eine. an dem Stützschenkel angelenkte Trittfläche an diesem über Scharnierarme in einer Führungsachse drehbar angeordnet ist; die Scharnierarme ihrerseits sind dabei an den Enden der oberen Stützholme in je einer Schwingachse klappbar gelagert. Weiterhin ist erfindungsgemäß auf wenigstens einer Schwingachse eine Klinke drehbar angeordnet, die ein besonderes Winkellangloch aufweist. In diesem Winkellangloch liegt zum Verriegeln in der ausgeklappten Stellung der Trittfläche die zu derselben zugehörige Schwenkachse. Das Winkellangloch heißt WinkelLangloch, da es die Form eines gewöhnlichen Langloches hat, das jedoch an dem einen Ende ein abgewinkeltes zusätzliches Langloch aufweist. Die Abwinkelung des Langloches liegt dabei an dem zu der Führungsachse entgegengesetzten Ende der Klinke. Im ausgeklappten Zustand kommt die Führungsachse in dem Winkelloch des Winkellangloches zum Liegen und wird dort gleichsam verriegelt. Infolgedessen wird in diesem Zustand der Abstand zwischen der Führungsachse und der Schwingachse in der Klinke starr festgehalten. Da sich aber beim Zusammenklappen des erfindungsgemäße Tritthockers die Schwingachse zwangsläufig zur Führungsachse hinbewegt, wird das Zusammenklappen des Tritthockers bei verriegelter Führungsachse unmöglich. Somit ist eine sichere Verriegelung geschaffen, so daß der Hocker weder beim Anheben an dem Steigschenkel noch bei ungleichmäßiger Belastung, insbesondere auf den vordersten Teilen der Trittflächen, von selbst zusammenklappt. Will man den Hocker aber zusammenklappen, so hat man lediglich die Klinke etwas anzuheben, so daß die Führungsachse aus dem Winkelloch gerät in das eigentliche Langloch. Nun kann sich die Klinke in dem Langloch entsprechend der Bewegung der Schwingachse beim Zusammenklappen auf der Führungsachse frei bewegen; also es kann sich die Schwingachse zu der Führungsachse hin bewegen.This object is now achieved in a stool of the aforementioned type in that at least one. on the support leg articulated step surface is rotatably arranged on this in a guide axis via hinge arms; the hinge arms, in turn, are hinged to the ends of the upper support bars in a respective pivot axis. Furthermore, according to the invention, a pawl is rotatably arranged on at least one oscillation axis and has a special angular elongated hole. In this angular elongated hole, the swivel axis belonging to the same lies in the folded-out position of the step surface for locking. The angular elongated hole is called an angular elongated hole because it has the shape of an ordinary elongated hole, but which has an angled additional elongated hole at one end. The angle of the elongated hole lies at the end of the pawl opposite the guide axis. In the unfolded state, the guide axis comes to rest in the angular hole of the angular elongated hole and is locked there, as it were. As a result, the distance between the guide axis and the oscillation axis is rigidly held in the pawl in this state. However, since when the step stool according to the invention is folded, the oscillating axis inevitably moves towards the guide axis, the step stool collapsing when the guide axis is locked. Thus, a secure lock is created so that the stool neither when lifting collapses on the riser even when the load is uneven, especially on the foremost parts of the treads. But if you want to fold the stool, you only have to lift the pawl a little so that the guide axis gets out of the angled hole into the actual elongated hole. Now the pawl can move freely in the elongated hole in accordance with the movement of the swing axis when folded on the guide axis; So the swing axis can move towards the guide axis.

Sofern man eine Verriegelung auch im zusammengeklappten Zustand wünscht, kann man auch noch an dem anderen Ende des Langloches in der Klinke ein weiteres Winkelloch vorsehen, oder eine ähnliche Verrastung.If you want a lock even when folded, you can also provide another angle hole at the other end of the elongated hole in the latch, or a similar latching.

Es ist aber bei einem Tritthocker gemäß der Erfindung wie auch bei anderen Tritthockern zweckmäßig, die Belastung möglichst beidseitig zu verteilen. Dies kann zwar auch dadurch erzielt werden, daß man auf jeder Seite des Tritthockers eine der erfindungsgemäßen Klinken vorsieht. Dies ist jedoch nicht so praktisch, da vom Verwender dann beide Hände beim Bedienen des Hockers zur Betätigung der Klinken benötigt werden.However, in a step stool according to the invention, as in other step stools, it is expedient to distribute the load as far as possible on both sides. This can also be achieved by providing one of the pawls according to the invention on each side of the step stool. However, this is not so practical since the user then needs both hands when operating the stool to operate the pawls.

Stattdessen empfiehlt es sich, daß die Scharnierarme über die Schwingachsen zu den oberen Stützholmen überstehende Anschlagflächen zum Anschlag an die oberen Stützholme im ausgeklappten Zustand der Trittfläche aufweisen.Instead, it is recommended that the hinge arms have stop surfaces projecting beyond the swing axes to the upper support spars for abutment against the upper support spars when the tread surface is unfolded.

Bei Belastung nehmen dann diese Anschlagflächen Druckkräfte auf, die sie auf die oberen Stützholme übertragen. Durch diese Anschlagflächen wird somit verhindert, daß die Scharnierarme sich über die oberen Stützholme hinaus weiter umklappen als gewünscht. Dadurch wird auch die Klinke entlastet, so daß man für die Klinke ein gewöhnliches, dünnes, gestanztes Blech verwenden kann. Denn die Klinke hat nur noch die Funktion, den Tritthocker im ausgeklappten Zustand zu halten, wo nur geringe Kräfte auftreten.When loaded, these stop surfaces then absorb compressive forces which they transmit to the upper support bars. These stop surfaces thus prevent the hinge arms from folding over beyond the upper support spars further than desired. This also relieves the pawl, so that you can use an ordinary, thin, punched sheet for the pawl. Because the pawl only has the function of keeping the step stool in the unfolded state, where only low forces occur.

Das Wesen der Erfindung sei auch noch anhand der Zeichnungen erläutert. Es zeigen:

  • Figur 1 eine perspektivische Ansicht eines Ausführungsbeispieles des erfindungsgemäßen Tritthockers;
  • Figur 2 eine Detailansicht von der Seite in Blickrichtung A gemäß Figur 1 zur Verdeutlichung der Scharnierarme und der Klinke;
  • Figur 3 eine Rückansicht des Ausschnittes gemäß Figur 2, jedoch in Blickrichtung B gemäß Figur 1.
The essence of the invention will also be explained with reference to the drawings. Show it:
  • Figure 1 is a perspective view of an embodiment of the step stool according to the invention;
  • FIG. 2 shows a detailed view from the side in viewing direction A according to FIG. 1 to clarify the hinge arms and the latch;
  • FIG. 3 shows a rear view of the detail according to FIG. 2, but in viewing direction B according to FIG. 1.

In Figur 1 ist ein erfindungsgemäßer Tritthocker im ausgeklappten Zustand dargestellt. Wie bei den bekannten Tritthockern wird der Tritthocker zunächst von dem Steigschenkel 1 gebildet. Der Steigschenkel 1 weist die beiderseits verlaufenden Steigholme 2 auf; diese Steigholme 2 werden von den Zentralachsen 6 in die oberen Steigholme 2a und die unteren Steigholme 2b unterteilt. Die Zentralachsen 6 dienen zum Anlenken des Stützschenkels 11. Der Stützschenkel 11 wird seinerseits ebenfalls von den Stützholmen gebildet. Auch die Stützholme werden wieder von den Zentralachsen 6 unterteilt und zwar in die oberen Stützholme 11b und die unteren Stützholme 11a. Dargestellt ist ein Tritthocker mit zwei Trittflächen 4 und 5. Die obere Trittfläche 4 ist über die Schwenkachse 13 in den Steigbolmen 2 des Steigschenkels 1 in bekannter Weise angelenkt. Entsprechend ist die untere Trittfläche 5 in den Steigholmen über die untere Schwenkachse 16 angelenkt. Die obere Trittfläche 4 und die untere Trittfläche 5 wenden von den Führungsstreben 15 mit der oberen Trittfläche 4 zusammengelenkt. Wie beim Stand der Technik sind diese Führungsstreben 15 an den Trittflächen jeweils im Bereich des vorderen Randes der Trittflächen angelenkt. Ebenfalls wie beim Stand der Technik weisen die Trittflächen umgebördelte Ränder auf, also nach unten umgebördelte Abschnitte. So ist mit 4a der-Bördelrand der oberen Trittfläche und mit 5a der Bördelrand der unteren Trittfläche gekennzeichnet. Solche Trittflächen sind gewöhnlich aus einem Blech hergestellt, dessen Rand leicht nach unten umgebördelt werden kann. Dieser Rand dient dann mit entsprechenden Bohrungen zum Anlenken bzw. Lagern der Achsen und Führungsstreben. Die untere Trittfläche 5 wird von der unteren Schwenkachse 16 ebenso in den Steigholmen gelagert, wie die obere Trittfläche 4 in der oberen Schwenkachse 13. Nun ist aber im Unterschied zum Stand der Technik der obere Stützholm 11b nicht starr durchgeführt; stattdessen ist er vorzeitig abgekröpft und auf ihn ein gesonderter Scharnierarm 8 aufgesetzt. Dieser Scharnierarm 8 weist ein in etwa U-förmiges Profil auf, in dessen Aussparung der obere Stützholm 11b paßt. Der obere Stützholm 11b lagert diesen Scharnierarm 8 an seinem Ende in der Schwingachse 3. Um diese Schwingachse 3 kann sich also der Scharnierarm 8 zu der unteren Trittfläche 5 hin drehen. An dem von dem oberen Stützholm 11b entfernteren Ende des Scharnierarmes 8 ist die Führungsachse 7 für die obere Trittfläche 4 gelagert. Als Lagerung kommen hier, wie bei den übrigen Teilen des Tritthockers, üblicherweise auch aus Kostengründen gewöhnliche Bohrungen in Frage. Die Führungsachse 7 ist dabei in dem Bördelrand 4a der oberen Trittfläche gelagert. Selbstverständlich ist es nicht absolut notwendig, daß diese Führungsachse 7 durchgängig ist; es genügen auch kurze Führungsachsenstücke bis in den Bördelrand 4a der oberen Trittfläche auf den beiden Seiten der Scharnierarme 8. Entsprechendes gilt im übrigen für die Schwenkachsen. Auf der einen Schwingachse 3 ist nun eine erfindungsgemäße Klinke 9 angeordnet. Sie ist hier in der gezeichneten Figur jedoch zum großen Teil von der oberen Trittfläche 4 verdeckt. Dennoch ist das Winkellangloch 14 deutlich zu erkennen, in dessen Winkelloch 17 im ausgeklappten Zustand die obere Schwenkachse 13 eingerastet ist. Die Klinke 9 ist auf der Schwingachse 3 gelagert und weist an dem freien Ende eine Klinkennase 10 auf, an der sie leicht betätigt werden kann. Wie dargestellt befindet sich das Winkelloch 17 an dem einen Ende des Winkellangloches, das von der Zentralachse 6 entfernt liegt.1 shows a step stool according to the invention in the unfolded state. As with the known step stools, the step stool is first formed by the riser 1. The riser 1 has the uprights 2 running on both sides; these risers 2 are divided by the central axes 6 into the upper risers 2a and the lower risers 2b. The central axes 6 serve to link the support leg 11. The support leg 11 is in turn also formed by the support bars. The support bars are again divided by the central axes 6 into the upper support bars 11b and the lower support bars 11a. A step stool with two step surfaces 4 and 5 is shown. The upper step surface 4 is articulated in a known manner via the swivel axis 13 in the climbing bars 2 of the climbing leg 1. Correspondingly, the lower step surface 5 is articulated in the risers via the lower pivot axis 16. The upper tread 4 and the lower tread 5 turn from the guide struts 15 together with the upper tread 4. As in the prior art, these guide struts 15 are articulated on the treads in the region of the front edge of the treads. Just as in the prior art, the treads have flanged edges, that is to say sections flanged downwards. 4a is the flanged edge of the upper tread and 5a is the flared edge of the lower tread. Such treads are usually made of sheet metal, the edge of which can easily be flanged downwards. This edge then serves with corresponding bores for articulating or mounting the axles and guide struts. The lower tread surface 5 is supported by the lower pivot axis 16 in the risers as well as the upper tread surface 4 in the upper pivot axis 13. However, in contrast to the prior art, the upper support spar 11b is not rigid; instead, it is cranked prematurely and a separate hinge arm 8 is placed on it. This hinge arm 8 has an approximately U-shaped profile, in the Cutout of the upper support beam 11b fits. The upper support bar 11b supports this hinge arm 8 at its end in the oscillation axis 3. The hinge arm 8 can thus rotate about this oscillation axis 3 towards the lower tread surface 5. The guide axis 7 for the upper tread surface 4 is mounted on the end of the hinge arm 8 which is more distant from the upper support beam 11b. As with the other parts of the step stool, storage can usually be carried out using conventional holes for cost reasons. The guide axis 7 is mounted in the flange 4a of the upper tread. Of course, it is not absolutely necessary for this guide axis 7 to be continuous; short pieces of guide axis up to the flange edge 4a of the upper tread on both sides of the hinge arms 8 are also sufficient. The same applies to the swivel axes. A pawl 9 according to the invention is now arranged on one oscillation axis 3. In the figure shown, however, it is largely covered by the upper step surface 4. Nevertheless, the angular elongated hole 14 can be clearly seen, in the angular hole 17 of which the upper pivot axis 13 is engaged in the unfolded state. The pawl 9 is mounted on the swing axis 3 and has a pawl nose 10 at the free end, on which it can be easily operated. As shown, the angled hole 17 is located at one end of the angled longitudinal hole, which is located away from the central axis 6.

In Figur 2 ist nun aus Blickrichtung A von der Seite her in Ausschnitt die Funktion des Scharnierarmes 8 und der Klinke 9 besonders deutlich zu erkennen. Gezeigt ist der Tritthocker hier in nur unvollständig ausgeklapptem Zustand. Daher ist die obere Schwenkachse 13 noch nicht bis zu dem Winkelloch 17 des Winkellangloches 14 in der Klinke 9 gekommen und daher auch noch nicht dort eingerastet. Entsprechend liegt die Anschlagfläche 18 auf dem zu dem oberen Stützholm 11b benachbarten Ende des Scharnierarmes 8 auf diesem oberen Stützholm 11b noch nicht auf. Würde man diesen Tritthocker, wie abgebildet, vollständig ausklappen, so ergäbensich folgende Bewegungen:

  • Der Stützholm 11b bewegt sich in Richtung des unteren Steigholmes 2b, also von dem oberen Steigholm 2a weg. Dieser Bewegung folgt die Schwingachse 3 und damit auch zwangsläufig die Klinke 9. Infolgedessen wird die Anschlagfläche 18 bis zum Anschlag auf den oberen Stützholm 11b gebracht; entsprechend wird die Klinke 9 mit ihrem Winkellangloch 14 bis zum Ende bewegt, so daß die obere Schwenkachse 13 in den Bereich des Winkelloches 17 gerät. Durch die eigene Schwerkraft fällt dann die Klinke 9 mit ihrem Winkelloch 17 auf bzw. über die obere Schwenkachse 13. Bei dieser Bewegung werden hingegen die Führungsstrebe 15 sowie die Führungsachse 7 mit dem zu ihr benachbarten Teil des Scharnierarmes 8 von dem unteren Steigholm 2b weg zu dem oberen Steigholm 2a bewegt. Somit folgt die obere Trittfläche 4 einer Schwenkbewegung ebenfalls von dem unteren Steigholm 2b weg. Durch diese Bewegung wird die nicht nachgestellte untere Trittfläche über die Führungsstrebe 15 mitgezogen in eine entsprechende Stellung.
In Figure 2, the function of the hinge arm 8 and the pawl 9 is particularly clear from the viewing direction A from the side to recognize. The step stool is shown here in an incompletely unfolded state. Therefore, the upper pivot axis 13 has not yet reached the angular hole 17 of the angular elongated hole 14 in the pawl 9 and has therefore not yet snapped into place there. Accordingly, the stop surface 18 does not yet rest on the end of the hinge arm 8 adjacent to the upper support beam 11b on this upper support beam 11b. If you completely unfolded this step stool, as shown, the following movements would result:
  • The support beam 11b moves in the direction of the lower climbing beam 2b, ie away from the upper climbing beam 2a. This movement is followed by the oscillation axis 3 and therefore also the pawl 9. As a result, the stop surface 18 is brought up to the stop on the upper support beam 11b; Accordingly, the pawl 9 is moved with its angular elongated hole 14 to the end, so that the upper pivot axis 13 comes into the region of the angled hole 17. Due to its own gravity, the pawl 9 with its angular hole 17 falls on or over the upper pivot axis 13. During this movement, however, the guide strut 15 and the guide axis 7 with the part of the hinge arm 8 adjacent to it become closed away from the lower riser 2b the upper riser 2a moved. Thus, the upper tread surface 4 also follows a pivoting movement away from the lower riser 2b. As a result of this movement, the lower tread surface, which is not adjusted, is pulled along via the guide strut 15 into a corresponding position.

In Figur 3 schließlich ist zur Verdeutlichung die Rückansicht, also aus der Blickrichtung B in Figur 1, des Ausschnittes gemäß Figur 2 dargestellt. Dargestellt ist der Tritthocker in seinem vollständig zusammengeklappten Zustand. Demgemäß liegt die obere Trittfläche 4 fluchtend zu dem Steig- schenkel und dem Stützschenkel bzw. den entsprechenden Holmen. Deutlich ist hier zu erkennen, wie die Klinke 9 an der Schwingachse 3 angelenkt ist und über der oberen Schwenkachse 13 liegt; nicht dargestellt ist bei dieser Perspektive selbstverständlich das Winkellangloch 14. Lediglich die Klinkennase 11 ist noch zu unterscheiden. Die Schwingachse 3 durchtritt desweiteren den Scharnierarm 8 und das Ende des oberen Stützholmes 11b. Hintereinander liegen zufälligerweise die Führungsachse 7, die auch durch den Scharnierarm 8 hindurchtritt und diesen lagert; nicht jedoch durchtritt die Führungsachse 7, obwohl es so aussehen könnte, den unteren Stützholm 11a. Vielmehr wird an dieser Stelle der untere Stützholm 11a von der Zentralachse 6 durchtreten. Diese Zentralachse 6 wird zwischen dem unteren Stützholm 11a und dem unteren Steigholm 2b durch eine gewöhnliche Abstandshülse 19 auf dieser Zentralachse 6 beabstandet. Der umgebördelte Rand 4a der oberen Trittfläche 4 ist in dieser Figur nur als gewöhnlicher Strich dargestellt. Dieser Bördelrand 4a ist zur Lagerung der oberen Schwenkachse 13 und der Führungsachse 7 jeweils durchbohrt. Entsprechend ist wenigstens die Innenseite des oberen Steigholmes 2a zur Aufnahme und Anlenkung der oberen Schwenkachse 13 durchbohrt; entsprechendes gilt hinsichtlich der Zentralachse 6. Auch die Führungsstrebe 15 ist in ansich bekannter Weise in dem Bördelrand 4a in einer passenden Bohrung angelenkt, wie in Figur 3 deutlich zu erkennen ist.Finally, in FIG. 3, the Rear view, that is to say from viewing direction B in FIG. 1, of the detail according to FIG. 2. The step stool is shown in its fully folded state. Accordingly, the upper tread surface 4 is flush with the S dough leg and the support leg or the corresponding bars. It can be clearly seen here how the pawl 9 is articulated on the oscillation axis 3 and lies above the upper pivot axis 13; The oblong slot 14 is of course not shown in this perspective. Only the latch nose 11 can still be distinguished. The swing axis 3 also passes through the hinge arm 8 and the end of the upper support beam 11b. The guide axis 7, which also passes through and supports the hinge arm 8, happens to lie one behind the other; however, the guide axis 7 does not pass through the lower support bar 11a, although it could look like this. Rather, the lower support beam 11a is penetrated by the central axis 6 at this point. This central axis 6 is spaced between the lower support beam 11a and the lower climbing beam 2b by a conventional spacer sleeve 19 on this central axis 6. The flanged edge 4a of the upper tread 4 is shown in this figure only as an ordinary line. This flanged edge 4a is drilled through for mounting the upper pivot axis 13 and the guide axis 7. Correspondingly, at least the inside of the upper riser 2a is drilled for receiving and articulating the upper pivot axis 13; the same applies to the central axis 6. The guide strut 15 is also articulated in a known manner in the flange 4a in a suitable bore, as can be clearly seen in FIG.

ZeichenerklärungExplanation of symbols

  • SteigschenkelRisers
  • 2a oberer Steigholm2a upper riser
  • 2b unterer Steigholm2b lower riser
  • 3 Schwingachse3 swing axis
  • 4 obere Trittfläche4 upper tread
  • 4a Bördelrand der oberen Trittfläche4a flanged edge of the upper tread
  • 5 untere Trittfläche5 lower step
  • 5a Bördelrand der anteren Trittfläche5a flanged edge of the anterior tread
  • 6 Zentralachse6 central axis
  • 7 Führungsachse7 leading axis
  • 8 Scharnierarm8 hinge arm
  • 9 Klinke9 jack
  • 10 Klinkennase10 jack nose
  • 11 Stützschenkel11 support legs
  • 11a unterer Stützholm11a lower support bar
  • 11b oberer Stützholm11b upper support bar
  • 13 obere Schwenkachse13 upper swivel axis
  • 14 Winkellangloch14 angled oblong hole
  • 15 Führungsstrebe15 guide strut
  • 16 untere Schwenkachse16 lower pivot axis
  • 17 Winkelloch17 angle hole
  • 18 Anschlagfläche18 stop surface
  • 19 Abstandshülse19 spacer sleeve

Claims (2)

1. Tritthocker (= Tritt) bestehend aus einem Steigschenkel (1), in dem in Schwenkachsen (13, 16) Trittflächen (4, 5) angelenkt sind, die von wenigstens einer Führungsstrebe (15) zusammengelenkt sind, und einem an dem Steigschenkel (1) angelenkten Stützschenkel (11), an dem wenigstens eine Trittfläche (4) angelenkt ist,
dadurch gekennzeichnet,

daß die wenigstens eine an dem Stützschenkel (11) angelenkte Trittfläche (4) an diesen über Scharnierarme (8), die an den Enden der oberen Stützholme (11b) in je einer Schwingachse (3) klappbar gelagert sind, in einer Führungsachse (7) drehbar angeordnet ist und daß auf wenigstens einer Schwingachse (3) eine Klinke (9) drehbar angeordnet ist, in deren Winkellangloch (14) zum Verriegeln in der ausgeklappten Stellung der Trittfläche (4) die zu derselben zugehörige Schwenkachse (13) liegt.1. step stool (= step) consisting of a riser (1) in which tread surfaces (4, 5) are articulated in pivot axes (13, 16), which are articulated by at least one guide strut (15), and one on the riser ( 1) articulated support leg (11) on which at least one tread surface (4) is articulated,
characterized,

that the at least one tread surface (4) articulated on the support leg (11) thereon in a guide axis (7) via hinge arms (8) which are pivotably mounted on the ends of the upper support bars (11b) in a respective pivot axis (3) is rotatably arranged and that on at least one pivot axis (3) a pawl (9) is rotatably arranged, in the angular elongated hole (14) for locking in the extended position of the tread surface (4) lies the pivot axis (13) associated therewith. 2. Tritthocker (= Tritt) nach Anspruch 1,
dadurch gekennzeichnet,
daß die Scharnierarme (8) über die Schwingachsen (3) zu den oberen Stützholmen (11b) überstehende Anschlagflächen (18) zum Anschlag an die oberen Stützholme (11b) im ausgeklappten Zustand der Trittfläche (4) aufweisen.2. step stool (= step) according to claim 1,
characterized,
that the hinge arms (8) have over the swing axes (3) to the upper support bars (11b) projecting stop surfaces (18) for stop against the upper support bars (11b) in the unfolded state of the tread surface (4).
EP82105736A 1982-06-28 1982-06-28 Lockable step-stool Expired EP0097733B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT82105736T ATE13331T1 (en) 1982-06-28 1982-06-28 LOCKING STEP STOOL.
DE8282105736T DE3263519D1 (en) 1982-06-28 1982-06-28 Lockable step-stool
EP82105736A EP0097733B1 (en) 1982-06-28 1982-06-28 Lockable step-stool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82105736A EP0097733B1 (en) 1982-06-28 1982-06-28 Lockable step-stool

Publications (2)

Publication Number Publication Date
EP0097733A1 true EP0097733A1 (en) 1984-01-11
EP0097733B1 EP0097733B1 (en) 1985-05-15

Family

ID=8189107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105736A Expired EP0097733B1 (en) 1982-06-28 1982-06-28 Lockable step-stool

Country Status (3)

Country Link
EP (1) EP0097733B1 (en)
AT (1) ATE13331T1 (en)
DE (1) DE3263519D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5064243A (en) * 1989-04-11 1991-11-12 Quain Kay D Apparatus and method for use in hospitals to promote patient-caregiver contact
CN112021879A (en) * 2020-08-11 2020-12-04 罗冬萍 Mobile e-commerce and recommended sales platform device
US20210037989A1 (en) * 2015-04-25 2021-02-11 Kids2, Inc. Convertible highchair

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10149760A1 (en) * 2001-10-02 2003-07-17 Hartmut Schonski Folding steps has components which fold together in and over each other for easy deployment where required

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1644856A (en) * 1926-03-19 1927-10-11 Evan L Reed Stepladder stool
FR2319004A1 (en) * 1975-07-19 1977-02-18 Hunter Douglas Ind Bv FOLDING AND DEGREE HOUSEHOLD STEP

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8121830U1 (en) * 1981-07-24 1982-01-28 Friedrich Ruschitzka Metallwarenfabrik Zuzenhausen bei Heidelberg, 6921 Zuzenhausen SEAT - FOOTSTOOL
DE8121831U1 (en) * 1981-07-24 1982-01-28 Friedrich Ruschitzka Metallwarenfabrik Zuzenhausen bei Heidelberg, 6921 Zuzenhausen FOOTSTOOL

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1644856A (en) * 1926-03-19 1927-10-11 Evan L Reed Stepladder stool
FR2319004A1 (en) * 1975-07-19 1977-02-18 Hunter Douglas Ind Bv FOLDING AND DEGREE HOUSEHOLD STEP

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5064243A (en) * 1989-04-11 1991-11-12 Quain Kay D Apparatus and method for use in hospitals to promote patient-caregiver contact
US20210037989A1 (en) * 2015-04-25 2021-02-11 Kids2, Inc. Convertible highchair
US11723477B2 (en) * 2015-04-25 2023-08-15 Kids2, Inc. Convertible highchair
CN112021879A (en) * 2020-08-11 2020-12-04 罗冬萍 Mobile e-commerce and recommended sales platform device
CN112021879B (en) * 2020-08-11 2021-12-14 威顺科技(湖北)有限公司 Mobile e-commerce and recommended sales platform device

Also Published As

Publication number Publication date
ATE13331T1 (en) 1985-06-15
EP0097733B1 (en) 1985-05-15
DE3263519D1 (en) 1985-06-20

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