DE202005011142U1 - Swivel bearing for roller attached to bed or trolley, comprising complementary plane surfaces serving as locking device - Google Patents

Abstract

The swivel bearing is assembled of a sleeve (11) accommodating an axially movable pin, and a second sleeve divided into two semi-cylindrical shells (2, 3) and accommodating a helical spring (7). A braking lever can be joined to a cam (51) secured with a threaded bolt (6). Plane areas (253, 353) at the inner surfaces of each of the shells (2, 3) are engaged with complementary areas (113) at the outer surface at the lower sleeve (11) preventing the parts from moving when the brake is activated.

Description

[Technical area]

The The invention relates to a pivot leg for a roller fitting with a lockable pivot axis and an anchoring brake, over the the wheel carrier the roller fitting is pivotally connected to a load.

[State of the art]

When pushing a moderately light load conveyor with roller fittings, such as a handcart, a tea cart, a hospital bed or a stroller, often used. In order to compensate for the resulting from the Ackerman effect in a turn or change direction, the roller fitting is rotatably mounted on a vertical pivot axis about this (so-called "swivel"). Since the pivot point of the roller / the impeller of the roller fitting is not in the extension line of the vertical pivot axis, the impeller is pulled backwards when the direction changes and automatically aligned to the changed direction of travel. In order to avoid that a equipped with roller fittings conveyor in its rest position already made with a small impact in motion (eg by the impact wheels rotate about their own wheel axles, or the roller fitting pivots about the vertical pivot axis.), The rotary or pivotal movement of the impeller and the vertical pivot axis of each roller fitting locked by a positive or non-positive rotation. As a rotational security of the impeller is a non-positive anchoring brake, which is pressed with a brake pad against the tread of the impeller. As a pivot lock the pivot axis is a positive coupling between the pivot axis and the wheel. The actuation of the rotary or pivot lock is carried out by a pivot-mounted, designed as a pedal two-armed lever ( 9 ), which presses about a rotatably mounted in the pivot leg cam and a spring slidably held in the pivot leg hexagonal inner rod against the brake. In order to allow easy installation of the cam and the spring in the interior of the pivot leg, the housing of the pivot leg is a plurality of parts, preferably formed of a hollow lower bush and a hollow upper bush, the latter consisting of two mirror-image Buchsehälften. In assembly, the cam and spring are first inserted into the upper and lower bushing, respectively. Then, the lower bush and the two upper Buchsehälften are firmly connected together to form a housing.

7 shows a known pivot leg for a roller fitting, which is a lower socket 81 , an upper bush made of two Buchsehälften 82 , a cam 83 and a spring 84 includes. The cam 83 consists of a functional cam and two lateral journals, each in a bearing mount 821 in a book half 82 are rotatably mounted. The feather 84 is in a central bore of the lower bush 81 and in one through the two channels 822 the two halves 82 formed central bore of the upper socket 82 held.

The firm connection of the lower bush 81 and the two upper book halves 82 each other is done as follows: each of the book halves 82 has at its mutually facing inner side in each case a pin 826 and a hole 827 on. Will the two Buchsehälften 82 pushed together to a cylinder, so the pin engages 826 a book half 82 in the hole 827 the other half of the book 82 one, causing a relative movement of the two halves 82 is prevented in the axial direction to each other.

The lower socket 81 has at its upper part an incorporated annular groove 811 and an end flange 812 on. Accordingly, each book half 82 on its inner surface in each case an inner flange 823 and an inner annular groove. Be the two halves 82 on the upper end of the lower bush 81 assembled, so engages the inner flange 823 in the outer ring groove 811 the lower socket 81 one, causing the lower socket 81 is held axially immovable in the upper sleeve.

The anti-rotation device of the lower bush 81 in the upper socket 82 done by two pins 86 , each diametrically through a hole 825 a book half 82 passed and into a hole 813 the lower socket 81 be brought into it.

For increased connection between the two halves 82 has the upper bush 82 at its upper end a circumferential annular groove 828 in which a clamping ring 85 is clamped from a resilient metal.

To limit the rotational movement of the cam 83 has the upper bush 82 a diametrically extending blocking rib 8211 on.

In the middle of the storage admission 821 a puncture is provided. After the assembly of the pivot leg is a camshaft with a hexagonal cross section through the through hole in the hexagonal central bore of the cam 83 pushed in, over which the cam 83 can be operated by the two-armed lever.

• 1) Zur drehfesten Verbindung der unteren Buchse 81 mit den oberen Buchsehälften 82 mittels der Stifte 86 müssen die beiden Hätten 82 in einer richtigen Winkelstellung auf der unteren Buchse 81 zusammengescoben werden, in der die Durchbohrungen 825 der beiden Hälften 82 genau mit der Bohrungen 813 der unteren Buchse 81 ausgerichtet werden (im Register). Die genaue Ausrichtung muß visuell (mit bloßem Auge) mit erheblichem Aufwand erfolgen.
• 2) Zur stabilen Verbindung des oberen Ende der oberen Buchse 82 muß diese an ihrem oberen Ende verlängert ausgebildet sein, um einen Fortsatz zu bilden, in dem eine Ringnut 828 eingebeitet wird. Zudem muß ein Spannring 85 aus einem Blech aus Federstahl ausgestanzt werden. Infolgedessen werden die Herstellungskosten erhöht.
• 3) Die Durchbohrungen 825 und die Bohrungen 813 müssen mit sehr geringer Toleranz an der richtigen Stellungen genau erzeugt werden.
• 4) Zur Begrenzung der Bewegung des Nockens 83 müssen in den beiden oberen Buchsehälften jeweils eine Sperrungsrippe 8211 eingearbeitet werden, was zur erhöhten Schwierigkeit und damit des Aufwands der Herstellung der oberen Buchse 82 fühet.

The well-known swivel leg has the consequences the disadvantages:

• 1) For non-rotatable connection of the lower bushing 81 with the upper half of the book 82 by means of the pins 86 the two should have 82 in a correct angular position on the lower bush 81 zusammengescoben in which the punctures 825 the two halves 82 exactly with the holes 813 the lower socket 81 be aligned (in the register). The exact alignment must be done visually (with the naked eye) with considerable effort.
• 2) For stably connecting the upper end of the upper bushing 82 this must be formed extended at its upper end, to form an extension in which an annular groove 828 is introduced. In addition, a clamping ring 85 be punched out of a sheet of spring steel. As a result, the manufacturing cost is increased.
• 3) The punctures 825 and the holes 813 must be accurately generated with very little tolerance at the correct positions.
• 4) To limit the movement of the cam 83 must each have a blocking rib in the two upper Buchsehälften 8211 be incorporated, resulting in increased difficulty and thus the expense of making the upper socket 82 fühet.

8th illustrates another known pivot leg, which also has a lower sleeve, a spring (not shown), an upper sleeve of two halves 93 , and a cam mounted therein 94 includes. Each of the upper book halves 93 also has a storage photograph 931 , a blocking rib 932 , a pen 933 and a hole 934 on. The firm cohesion of the two upper Buchsehälften occurs 93 through a hollow intermediate bush or sleeve 91 with a breakthrough 912 which is fixedly connected at its lower end to the upper end of the lower socket in a manner not shown and in which the two upper Buchsehälften 93 inserted free of play and thus firmly held together.

• 1) Da zwischen der oberen Buchse 93 und der Zwischenbuchse 91 kein Spiel bestehen soll, müssen die fertig zusammengeschobene obere Buchsehälften 93 mit erheblichem Kraftaufwand in den Innenraum der Zwischenbuchse 91 eingeschoben werden, wobei eine genaue Ausrichtung des Durchbruchs 912 mit der zentralen Durchbohrung des Nockens 94 erforderlich ist, damit in der späteren Stufe eine ungehinderte Einführung der Nockenwelle durch den Durchbruch 912 hindurch in die zentrale Durchbohrung desselben möglich ist. Diese genaue Ausrichtung muß ebenfalls visuell mit erhöhtem Aufwand erfolgen.
• 2) Damit die gesamte Länge des Schwenkbeins gleich wie das in 7 gezeigte Schwenkbein gehalten werden kann (d.h. die gesamte Länge soll nicht infolge der zusätzlichen Zwischenbuchse zu lang bemessen sein), muß die obere Buchse 93 in ihrer Länge kürzer ausgebildet sein. Bedingt durch den Einbau der Bremse im Rollenbeschlag wird die Zusammenbau des Schwenkbeins erschwert, unabhängig davon, ob zuerst die Zwischenbuchse 91 auf der unteren Buchse befestigt und dann die obere Buchse 93 in die Zwischenbuchse 91 eingeschoben wird, oder zuerst die obere Buchse 93 in die Zwischenbuchse 91 eingeschoben und dann die Zwischenbuchse zusammen mit der darin festgehaltenen oberen Buchse 93 auf der unteren Buchse befestigt wird.
• 3) Um eine sichere Unbeweglichkeit der oberen Buchse 93 in der Zwischenbuchse 91 zu gewährleisten, muß die Zwischenbuchse 91 nach erfolgtem Einschieben der oberen Buchse 93 einer aufwendigen Walzbearbeitung unterzogen werden, was zu einer weiteren Erhöhung der Herstellungskosten führt.

With the pivot leg remains the upper disadvantage ( 4 ) but unobtrusive. In addition, the pivot leg has the disadvantage ( 4 ) nor the following disadvantages:

• 1) Since between the upper socket 93 and the intermediate socket 91 There should be no game, the finished zusammengehobene upper Buchsehälften 93 with considerable effort in the interior of the intermediate socket 91 be inserted, with a precise alignment of the breakthrough 912 with the central perforation of the cam 94 is required so that in the later stage unimpeded introduction of the camshaft through the breakthrough 912 through it in the central perforation of the same is possible. This precise alignment must also be done visually with increased effort.
• 2) So that the entire length of the pivot leg is the same as that in 7 shown swivel leg can be kept (ie the entire length should not be too long due to the additional intermediate socket), the upper socket 93 be shorter in length. Due to the installation of the brake in the roller fitting, the assembly of the pivot leg is made more difficult, regardless of whether first the intermediate bushing 91 attached to the lower socket and then the upper socket 93 in the intermediate socket 91 is inserted, or first the upper socket 93 in the intermediate socket 91 pushed in and then the intermediate socket together with the upper socket held therein 93 is attached to the lower socket.
• 3) To ensure a safe immobility of the upper socket 93 in the intermediate socket 91 to ensure the intermediate socket 91 after the insertion of the upper bush 93 be subjected to a complex rolling, resulting in a further increase in manufacturing costs.

Here The invention aims to remedy this. The invention is the task underlying, a swivel leg of the o.g. To provide genus with the o.g. Disadvantages are largely avoided.

The The object is achieved in that the anti-rotation the lower socket in the upper socket not with the help of the pins, through the upper sleeve through into the holes in it lying lower socket, but by a non-circular outer cross-section the lower sleeve and a complementary, also not circular inner Cross section of the outer sleeve (i.e., a non-rotatable positive coupling between the lower and the upper socket) takes place. Serve in this way through the upper half of the book guided through Pins only for fixing the two upper Buchsehälften and no longer for anti-rotation, resulting in a precise alignment unnecessary.

According to one advantageous development of the invention, it is provided that the blocking rib by a locking pin is replaced, the same time to the fixed Connection of the two upper Buchsehälften at its upper end serves. This eliminates a complex processing for the production the barrier ribs and for that certain annular groove and a clamping ring.

The Invention will now be described with reference to the drawing preferred embodiments explained in more detail. It demonstrate:

[Drawing]

1 in perspective exploded view of an inventive pivot leg,

2 a side view of the pivot leg according to the invention in the assembled state,

3 a cross section through the upper bush in the region of the locking bolt as a limitation of the movement of the cam,

4 a cross section through the upper bush in the region of the flattening as anti-rotation,

5 and 6 corresponding 1 and 4 a second embodiment of the pivot leg according to the invention,

7 and 8th each in an exploded perspective view of a known pivot leg according to the prior art, and

9 a perspective view of a roller fitting with a two-armed lever.

[Explanation of Preferred Embodiments]

1 shows an inventive pivot leg 1 that is like the state of the art in 7 a lower socket 11 with an annular groove 111 and an end flange 112 , an inner rod, which is displaceably guided therein, and an upper bush made of two half-book halves 2 . 3 each with a storage mount 24 . 34 , an inner flange 251 . 351 , an inner ring groove 252 . 352 , and a channel 25 . 35 , a cam 51 with a cam disc and two lateral journals, and a spring 7 that covers in through the channels 25 . 35 formed puncture is held. Each of the upper book halves 2 . 3 also has a pen 21 . 31 and a hole 22 . 32 on.

The peculiarity of the invention is that as a rotation lock the lower socket 11 two diametrically opposed flats 113 has, while every book half 2 . 3 accordingly each a counterflattening 253 . 353 having. Because of the non-circular cross section in the area of the flattening / counterflattening ( 4 ) results after the composition between the lower socket 11 and the upper socket 2 . 3 a non-rotatable positive coupling. That's why the pins are used 4 only to connect the two upper Buchsehälften 2 . 3 , but not to turn the lower socket 11 like the pins 86 in 7 the case is. This eliminates a complicated alignment of the holes 23 . 33 for the pins 4 ,

Another peculiarity of the invention is that limiting the movement of the cam 51 through a locking bolt (threaded bolt) 6 takes place, each in a semicircular groove 241 . 341 every book half 2 . 3 is included and connects them together ( 3 ). This eliminates a clamping ring for solid holding the two halves 2 . 3 and a complex processing for producing an annular groove for the clamping ring and a blocking rib.

5 and 6 represent a second embodiment, with the difference that each Abflächung 113 a hole 114 and every counterflattening 253 . 353 accordingly a pen 254 . 354 that is in the corresponding hole 114 engages ( 6 ). Through the engagement of the pins 244 . 354 in the holes 114 is the torsional strength of the sockets 11 . 2 . 3 still increased. In addition, by the intervention and the immobility of the lower socket 11 increased in the axial direction.

Claims (6)

A rocker arm for a roller fitting, via which the wheel carrier of the roller fitting is pivotally connected to a load, wherein the roller fitting comprises a brake which is actuated by a lever, wherein the pivot leg comprises: a lower socket 11 in which an inner rod is slidably held, an upper bushing firmly connected to this two upper Buchsehälften 2 . 3 each of which is a channel 25 . 35 and a storage photograph 24 . 34 one in one through the two channels 25 . 35 formed puncture held spring 7 , one on top of the spring 7 supporting cam 51 with a cam disc and two lateral journals, each rotatable in a bearing mount 24 . 34 one of the book halves 2 . 3 are stored, a clamping means for holding together the two Buchsehälften 2 . 3 at its upper end, a diametrically extending limiting means for limiting the movement of the cam 51 , and a rotation lock the lower bushing 11 in the upper socket 2 . 3 , characterized in that as a rotation lock the lower socket 11 two diametrically opposite flattening 113 while each of the upper book halves 2 . 3 Accordingly, in each case on its inner surface a Gegenabflachung 253 . 353 on. Swivel leg according to claim 1, characterized in that the lower bushing 11 at her every flattening 113 one hole each 114 having, while each of the upper book halves 2 . 3 at their counterflattening 253 . 353 in each case a radially anchoring inside pin 254 . 354 has, each in a hole 114 intervenes. Swivel leg according to claim 1, characterized in that each of the upper half of the book 2 . 3 two holes each 33 for two pens 4 to connect the two halves 2 . 3 has each other. Swivel leg according to claim 1, characterized in that the limiting means a locking pin 6 is, which also serves as the clamping means and each in a semicircular groove 241 . 341 every book half 2 . 3 is included. Swivel leg according to claim 1, characterized in that each of the upper half of the book 2 . 3 on each of its inner surfaces a pin 21 . 31 and a hole 22 . 32 having, wherein the pin 21 . 31 a book half 2 . 3 in the hole 32 . 22 the other half of the book 3 . 2 intervenes. Swivel leg according to claim 1, characterized in that each of the upper half of the book 2 . 3 a channel 25 . 35 has, which together form a through hole for the spring.