DE2106545A1 - Chassis with castors, especially for hospital beds - Google Patents

Description

Happe & Co., 5606 Tönisheide, Wülfrather Str. 35-37

"Chassis with castors, especially for

Hospital beds "

The invention relates to a control with swivel castors. See chassis, in particular for hospital beds, which is provided with longitudinal beams consisting of hollow profiles and frame legs attached to them, as well as a central control device. can be seen that has at least one control rod displaceably mounted in one of the longitudinal members, adjustable by an external operating lever, with the aid of which spring-loaded push rods accommodated in the frame legs for blocking or releasing the swivel and / or anti-rotation mechanism of the castors in question accordingly are height adjustable.

In known chassis of the above type provided with centrally controlled swivel castors, the push rods and the control rods which actuate them are slidably mounted in the hollow profiles receiving them by means of appropriately arranged plastic bearing bushes. The sliding friction caused by this is considerable, especially with regard to the sharp raftunilerikung between the push rods and the control rod ν-.ο, ϊΛ . This not only leads to increased wear and tear

at the relevant sliding bearing points, but also requires a relatively high adjustment effort, especially when the push rods are advantageously spring-loaded in the blocking direction, so where springs acting on the push rods apply the braking or blocking force necessary to block the pivoting and rotary adjustment mechanism. Furthermore, it is disadvantageous in the known chassis with control rods supported in slide bearings and thereby actuated push rods that the installation of the moving parts of the central control device and the slide bearing bushes can only be carried out in close adaptation to the profile of the longitudinal members and frame legs to be used and at the same time relatively- tight tolerances must be adhered to.

The invention is therefore based on the object of providing a chassis provided with centrally controlled castors, in particular for hospital beds to create that does not have the aforementioned shortcomings, rather a central control device possesses, which is easier to assemble and to be built into hollow profiles of any shape, against wear is less susceptible and can be operated with less adjustment effort. This task is starting from a Chassis of the type mentioned at the outset achieved according to the invention in that the push rods act on them Guide links are held and the control rod is mounted on rollers. The control rod is there advantageously from a U-profile rail that

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on their underside with several longitudinal slits of different widths is provided, of which the wider for the passage of the rollers mounted between the rail legs and the narrower ones serve for the passage of the tappet rods, the thickened heads of which are each used from the correspondingly fork-like free end of the pivotably mounted in the longitudinal member hollow profile Guide links are under attack. The latter are included on the delimiting the corresponding passage slots Bar edges of the control rod or on wear-resistant sliding blocks attached to it, e.g. made of hardened steel, on. With the afore-mentioned means according to the invention one arrives at a swivel castor chassis, its central control device is of a relatively simple nature and conveniently in any profiled chassis longitudinal members and frame legs can be installed, in addition, because of the sliding friction-free guidance of the control rod and the Thanks to the height-adjustable push rods, they are also very easy to operate and also wear-resistant is.

According to a further feature of the invention, the control rod can also be inserted into a third one for directional fixing at least one swivel castor serving adjustment position are brought, as is known per se. However, while with the known Chassis for triple adjustment of the control rod only one outside actuation lever is available, which is due to the relative closely adjacent position of the release and directional

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Fixing position of the control rod often leads to operating difficulties or setting errors, two external actuating levers are provided according to the invention for adjusting the control rod, of which the first to adjust the control rod only in the blocking odef release position of the castors allowed, while the second is used to move the control rod in the direction locking position. This way there are operating errors as good as impossible because of the presence of two operating levers and the strict separation of those assigned to them Functions of the operating personnel are evident in relation to the actuation of the central control device that they want in each case is stopped.

Finally, the invention also provides that the directionally lockable swivel castor in a manner known per se with a cavity in the swivel castor a central control bolt which cooperates with the spring-loaded tappet rod in the blocking direction Leaf spring is provided, which is in the lowest, the blocking position of the rest of the castors corresponding position of the Central control pin brakes on the caster wheel circumference, on the other hand in the highest, the directional lock corresponding position of the central control pin with a Above angled, blade-like locking edge in diametrically opposite grooves in one of the lower end of the frame leg non-rotatable swivel bearing plate engages. This allows the directionally lockable swivel castor to be different than with the previously known centrally controlled swivel castor

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Chassis in the blocking position of the remaining castors also "blocked" or to be braked, which results in a correspondingly more stable set-up of the chassis or the hospital bed on it.

Further features according to the invention will be described with reference to an embodiment shown in the drawing. In it they show

Pig.1,2 and 3 a sectioned partial view of the new one

in

Chassis with / three different setting positions located central control device, the |

4, 5, 6 and 7 are sections along the lines AA and BB, GC and DD of FIGS. 1 and 2, respectively

Fig. 8, 9 and 10 each longitudinally sectioned partial views of the directionally lockable castor, namely in the directionally locked, the free and braking position of the castor locking mechanism ..

The provided with centrally controlled castors vehicle (on the frame essentially consists of the arranged on both sides of the frame and by corresponding cross beams interconnected, hollow longitudinal beams 1 and the thereto, respectively front and rear fixed two frame legs 2 and 3, likewise of corresponding hollow sections exist and are welded to the longitudinal beams, which have corresponding passage openings 1 ^1. In each of the frame legs 2, 3 the insertion pins 4 of the castors are loaded at the bottom.

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solidifies. The latter are basically of the nature shown in FIG. 8 and 10. Because you own one with the insertion pin 4 via the ball bearings 5, 6 pivotally connected steering roller fork 7, a rotatable in the latter mounted wheel 8 as well as one in the castor fork

The leaf spring 9 accommodated in the cavity 7 'is supported on the central control pin 10 penetrating the center of the plug-in pin 4 via the intermediate member 11 which is bent in a Z-shape. Different from the one in the Pig. 8 to 10 shown steering roller, which is provided as the only one for the directional locking and is described below, the other three steering rollers are designed so that they are in the lowest position of the Z entralsteuerbolzens 10, in the so-called blocking position, both in their pivoting mobility as well are blocked in their wheel rotation by the double leaf spring 9 to be expanded. While the lower part of the leaf spring 9 lies against the circumference of the wheel 8, the upper part of the leaf spring engages in the pivot bearing plate 12, which is correspondingly toothed on its underside and which is attached to the Ein eckzapf en 4 so that it cannot rotate. If, on the other hand, the central control pin 10 is raised in the aforementioned three castors, the relevant castor locking mechanisms are released, ie the castors in question can then freely pivot about their G-estellbeinaehsen and their wheels rotate ^{freely about the axes 8 f.}

The swivel castor shown in FIGS. 8 to 10, which is used to determine the direction, is

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Benen castors designed differently, as here the double leaf spring 9 in. The lowest position of the Zentralst euerbolzens 10 (Fig. 10) rests only braking on the circumference of the wheel 8, so is not also determined in their pivoting. In the middle setting position of the central control pin 10 shown in FIG. 9, which already corresponds to the release position of the other swivel castors, the directionally lockable swivel castor is also freely pivotable and rotatable. In contrast, the leaf spring 9 engages with its chisel-like locking edge 9 ¹ in. The uppermost position of the central control pin according to lig. 8 in diametrically opposite grooves 12 'of the non-rotatable swivel bearing plate 12, whereby this swivel castor is fixed in a certain swivel setting position, which normally corresponds to the longitudinal direction of the chassis, while the remaining swivel castors are still free to swivel and rotate, thus stopping the chassis from moving this way is determined.

The central control device used to block, release and fix the direction of the castors consists essentially of the control rods 15, which are movably accommodated in the two longitudinal members 1, the two external actuating levers 16, 17 that allow them to be adjusted, and the push rods 18 to be lifted by the control rod As shown in FIG. 1, ^{thickened at their lower r} ides to form piston plates 19, on which compression springs 20 are supported, which are drawn in at their other end on the

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Ceiling of the sleeves 21 are supported, which in the frame legs 3 are embedded. By the springs 20, the push rods 18 are pressed down, against the one here in the plug-in pin 4 displaceably mounted central control pin 10, which can also be provided with a screw adjustment part 10 'for the purpose of more precise adjustment.

At the upper ends, the push rods 18 are provided with thickened heads 18 '. You will be here by means of the guide links 22 engaging under the heads 18 ' guided on the G-pivot bolts 23 in the side members 1 are pivotably mounted. With their free, fork-like ends 22 ', which the heads 18' of the push rods Reach below 18, the guide links 22 are at the boundary edges the passage slots 24 present in the control rod 15 or on appropriately arranged, made of abrasion-resistant Material such as hardened steel, existing sliding blocks 25.

The control rods 15 exist, such as in particular the Mg. to 7 show from U-shaped profile rails. In the bottom the U-profile rails 15 are apart from the longitudinal slots already mentioned 24 for the passage of the push rods 18 further longitudinal slots 26 for the passage between the Schienenschenk "a 15 'mounted rollers 27 available, which roll on the floor of the side members 1 «

The two serve to adjust the control rod 15 External operating levers 16, 17, which are on a common, at

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the bearing plate 28 of the longitudinal member in question attached to bolts 29 are pivotally mounted. Me external operating lever 16, 17 are provided with control tabs 16 or 17 ', through the slot 1 ″ in the bottom of the side member 1 reach through and with their fork-like ends 16 'and 17' 'the driver pin attached to the control rod 15 30 reach around. There is between the control tab fork 16 ′ belonging to the first actuating lever 16 and the driver pin 30 a driver play 31 »that for additional adjustment of the control rod 15 in its directional locking position according to FIG. 2 by means of the second external operating lever 17 is used. The first external actuating lever 16 is advantageously designed in the shape of a bow and extends over the full front width of the chassis up to the side member or external operating lever 16 arranged on the other side Texture and arrangement. In contrast, the second external actuation lever 17 is expediently only as short actuating lever formed and arranged solely on the side that the actuated by it directional lockable Includes swivel castor.

In the position of the two external operating levers shown in FIG. 3 16, 17 are the control rods 15 located on both sides of the chassis in their furthest shifted to the right position, in which the push rods 18 and thus also the central control pin 10 are their deepest Take position, thus the pan and rotation vers-fcellmökeii; the three appropriately designed swivel castors as well as the swivel

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mobility of the fourth swivel castor are blocked or braked. So it is about the blocking division in which the Chassis braked and held immobile. If, on the other hand, the chassis is to be able to be moved freely, the first external actuation lever 16, for example by foot actuation, pressed down into the position shown in FIG. 1, whereby the control rod 15 with simultaneous partial entrainment of the actuating lever 17 in the release position is moved to the left. Ih this position of the central control device all swivel castors can be freely rotated and swiveled. The chassis or the hospital bed on it can be moved and swiveled as required. However, if the bed is over a longer distance, for example through the Hospital corridor, which is to be transported straight ahead, becomes the direction-lockable swivel castor located at the front in the direction of travel locked in the direction of travel (Fig. 8) · This is done by additionally pressing down the second external operating lever 17, whereby the control rod 15 is adjusted by a further piece to the left in the third, the so-called directional locking position will. This results in a further lifting of the push rods 18, which in the case of the directionally lockable swivel castor does so leads that here the push rod 18 or its piston plate 19 of the central control pin 10 lifts off, so that the latter is under the influence of the leaf spring present in the caster fork cavity 7 * 9 can be pushed upward as far as the blade-like locking edge 9 * of the leaf spring 9 in the opposite grooves 12 dee rotatably arranged

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Neten 'swivel bearing plate 12 engages. This also happens in the event that when the second external operating lever 17 is operated, the directionally lockable castor is not yet in the direction of travel, but should assume an inclined position. In this case, namely, the locking edge 9 ¹ slides on the underside of the swivel bearing plate 12 until the swivel position of the directionally lockable swivel castor, which corresponds to the direction of travel, is reached.

Various modifications are possible within the scope of the present invention. For example, the U-profile Control rod 15 can basically also be turned upside down, i.e. arranged with its bottom or web facing upwards.

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Claims (5)

- JHr claims ϊ 710654 ^v ij Chassis provided with swivel castors, especially for hospital beds, with longitudinal beams consisting of hollow profiles and frame legs attached to them, as well as a central control device which has at least one control rod that is displaceably mounted in one of the longitudinal beams and adjustable by an external operating lever, with the help of which is accommodated in the frame legs, Spring-loaded push rods zuzjBlockierung oaer release of the swivel and / or rotation locking mechanism of the relevant castors are correspondingly adjustable in height, characterized in that the push rods (18) are held by guide links (22) engaging them and the control rod (15) is supported by rollers (27) is· 2. Chassis according to claim 1, characterized in that the control rod (15) consists of einijü-Profilscniene, which is provided on its underside bit several different width longitudinal slots (24, 26), of which the wider (26) for the passage of between the Scbienenschenkeln (15 ^f) intended for the passage üer push rods (18) rollers mounted (27) and the narrower (24), the thickened formed heads (18 ') in each case of de "corresponding fork-like free end (22 ·) of the in the side member 209835/0364 - rr- Hollow profile (1) pivotably mounted guide link (22) Are under attack. 3. Chassis according to claims 1 and 2, characterized characterized in that the guide, which engages under the push rod heads (18), ends in a non-articulated manner (22) on the web edges of the control rod (15) and delimiting the corresponding passage slots (24) wear-resistant sliding blocks (25) attached to it, e.g. made of hardened steel. 4. Chassis according to one or more of claims 1 to 3, with a control rod which is in a third setting position serving to determine the direction of at least one swivel castor is to be brought, characterized in that two external actuating levers for adjusting the control rod (15) (16, 17) are provided, of which the first (16) the control rod (15) only in the blocking octer release position of the swivel castors allows adjustment, while the second allows the control rod to be moved (15) in the direction locking position (Fig. 2) is used. 5. Chassis according to claim 4, characterized in that that both external actuation levers (16, 17) on a common, on a bearing plate (28) of the concerned The longitudinal member (1) fastened bolts (29) are pivotably mounted to a limited extent and over on them 209835/0364 fastened, a slot Ci ") in the side member (1) penetrating control tabs (16 ·, 17 *) with fork-like ends (16 * ', 17 ¹¹ ) encompass a common Mitnehraerstift (30) of the control rod (15), with between the The control tab fork (16 ') belonging to the first actuation lever (16) and the drive pin (30) have a correspondingly large drive clearance (31) for additional adjustment of the control rod (15) into the directional locking position by means of the second external actuation lever (17). 6. Chassis according to claims 4 and 5, characterized in that the directionally lockable swivel castor in a manner known per se (17) with one ^{accommodated in the swivel castor fork cavity (7 f} ) and one with the one spring-loaded in the blocking direction (18)
Plunger rod cooperating central control pin (10) supported leaf spring (9) is provided, which in the lowest position of the central control pin (10) corresponding to the blocking position of the other castors rests braking on the caster wheel circumference, on the other hand in the highest position of the central control pin (10) corresponding to the directional locking ) engages with an upwardly angled, blade-like locking edge (9 ¹ ) in diametrically opposite grooves (1 ^ *) of a pivot bearing plate (12) arranged non-rotatably at the lower end of the frame leg. 209835/0364 L e r s e ι f e