The invention relates to a folding bed, which is covered with a mattress and comprises a head frame, back frame and foot frame, which are connected to one another in an articulated manner and are arranged in a collapsed state in a basic frame or box such that they can be raised and lowered by means of a lifting mechanism,
Such known folding beds usually have on both sides of the basic frame respectively a four-bar linkage, which require a tilting of the bed when it is lifted or lowered, and therefore have a considerable requirement for space in and around the basic frame.
It is the object of the invention to create a safe lifting and folding mechanism with a fixed mattress, which is most compact to stow away in the basic frame.
This object is met in such a way, that the lifting mechanism comprises scissors-type lifting arrangements, spring-loaded for lifting action, which are provided on both sides of the head frame respectively, a first scissors arm of each lifting arrangement being articulated, at the bottom end, on the basic frame, where a horizontally movable second scissors arm is supported, the top end of which is articulated at the end of the head frame, and that the first scissors arm is articulated, at its top end, on a short block link at the back-part head-frame end with an articulation on which acts a link plate which is connected in an articulated manner to a control arm and is connected to a spacing head-frame connector of the head frame and of the back frame, and is arranged in such a way, that when the head frame connector is brought to a horizontal position, the block link is in a dead-centre position of the scissors articulation, and that when the connector is in an inclined position the block link is lead out from the dead-centre position, so that the lifting mechanism holds the head frame in a lowered position.
Advantageous forms of the invention are indicated in the subclaims.
The block link has such a length that in the case of a rotation of approximately 180° the scissors-type lifting arrangement is moved from the upper position, in which the bed is used, to the recessed bottom position. Correspondingly, the control arm is longer, which actuates the full lifting movement when it is rotated by 90°. The horizontal component of the tentile force secures the locking position of the block link.
The spacing connector between the head frame and the back frame has a length that corresponds to approximately the double thickness of the mattress, which is folded when the bed is lowered.
Similarly, there is another spacing connector between the back frame and the foot frame, which however is much shorter, because the mattress is folded around this connection on the outside.
To ensure a smooth folding of the three frames, the two connectors are connected via a control rod in such a way that the two frame articulation arrangements respectively form approximately the same angle. For this purpose the control rod is articulated at the two connectors respectively, spaced to the articulation of the back frame, so that a controlling four-bar linkage is formed.
The four-bar linkage is preferably shaped in such a way that in the collapsed state the articulation of the control rod at the foot frame connector crosses the connecting line between the neighbouring articulation of the foot frame connector at the back frame and the other articulation of the control rod, thus keeping the mattress from unfolding because of the pressure of the compressed areas. Only when the bottom end is lifted, the blocking is released by shifting the articulation at the foot frame connector back across the above-mentioned line and thus pulling the control rod.
The folding of the connectors is advantageously supported by a spring, which is pre-tensioned and arranged between the back frame and the head frame connector.
The mattress is advantageously held at the head and bottom end with a tuck in an undercut slot profile, especially at the head and foot frame, by means of a bar inserted into the tuck, whose diameter is larger than the width of the outlet of the slot. This way the mattress or its supporting covering always remains leveled with the frames when the frames are folded and covers the fitting parts, such as springs, control rods, scissors and supporting legs towards the top. On the side of the frames, only the articulation bolt heads and the connectors are accessible, thus in this area there is no danger of pinching or crushing for the user as well. The scissor arms and the blocking mechanics are locked in the lying position of the bed, and thus secured. Folding and unfolding of the frames is effectuated by seizing and lifting the free bottom end, so that there is no risk of collision with the basic frame and the scissors-type lifting arrangement.
Bearing racks are arranged at the bottom end and at the head frame connector, each bearing rack consisting of two legs and a cross brace. The legs are attached to the head frame connector, so that they automatically come to lie between the head frame and the back frame during a folding operation. The legs at the bottom end are either attached firmly to the frame or pivoted in articulation heads at the foot frame with two bolts leading around a corner in an angled motion link. The bolts are attached at a distance to the upright leg, and the side pieces of the motion link are slightly longer than the extension of the spaced bolts, this way the mechanism is secured against tilting with a lateral load, both in the angled and in the parallel position of the legs in relation to the foot frame. The higher the load on the frames, the more they are secured. When the bottom end of the bed is lifted, the legs sink from the security position, thus they can easily be rotated manually into the folded parallel position. The folding and unfolding of the bearing rack is done advantageously when the foot frame is lifted. In the parallel position of the legs in relation to the foot frame, there is an open space between the legs, so that there is no risk of pinching.
The entire arrangement, in all its details and during all folding processes, is completely safe and, since minimum spacing between the moving parts is observed, the risk of crushing and thus injuring hands and fingers is avoided. In addition, there is no uncontrolled retraction or extension and no risk of shearing in the range of the articulations. In the unfolded lying position no frame parts extend above the so that there is no edge for a sleeper to knock against. All parts are interlocked in an immobile position when the bed is charged by persons in different ways.
In another embodiment the bed is provided with a basic frame, on the side frames of which the scissors-type lifting arrangements are articulated at the bottom side, respectively. The two side frames are interconnected by crossbars. The frames are made of angular material, into the vertical limbs of which hook-in eyelets are placed, to attach cushion armrests, a front panel and a backrest. The two legs at the bottom end fit between the side frames when the bed is folded, and stand on the inside at the front-side crossbar. Thus, the folded framework stands firmly in place.
To further increase the security of the framework position in the unfolded state, a boomerang-shaped or angular support angle is articulated on both sides, respectively between the vertical piece of the side frame at the bottom end and the head end of the back frame, said angle supporting the back frame at a lying level, in the same way as the legs.
The support angle is provided with an eyelet directed towards the scissors-type lifting arrangement, the scissors spring is hooked into said eyelet, which at the head end is connected with the scissors arm in an articulated manner. This way the scissors spring apart from the scissors also holds the support angle in the lying position.
Supports are arranged at the head end of the basic framework, on which the head frame is rests in the folded position. So this position, too, is stably supported by the legs at the other end and is not affected by the thickness of the cushioning, which increases its security.
Furthermore, an elastic locking fork is arranged at both sides of the bottom of the foot frame respectively, said fork encompassing a cross brace of the back frame in the folded state; in doing so it secures the state against independent unfolding. Moreover, a notch towards the side frame is provided at the end of the foot frame.
As a further security measure, the folding of the foot frame towards the back frame is restrained, on both sides respectively, by a damper, which is articulated, on one side, at the foot frame and, on the other side, at the foot frame connector.
The head and foot frame connectors are box-shaped with caps and cover the areas of the articulations as well as the articulation parts, which are moving and rotating in relation to each other, towards the outside.
In an advantageous embodiment the foot frame connector is made of plastic as a multifunctional component, into which bearing eyes, lever appendages and a leg connecting stud, as well as deepenings for a cover cap are integrated.
The attached backrest advantageously has a hollow shape, so it can be used for receiving blankets and pillows. Through a flap, which extends in the back area, the storage space is easily accessible.
Advantageous embodiments are represented in the
FIG. 15+16 each show a corner in a perspectively reduced view, one with the frame nearly folded, one with completely folded frame;
FIG. 19+20 show the foot frame connector with leg with unfolded and folded frame, respectively;
FIG. 21+22 show perspective side views unfolded and folded, respectively, view from the head end;
The completely folded scissors-type lifting arrangement consists essentially of the scissors arms 47, 48, which are connected in the scissor articulation 51. At the lower end of the first scissors arm 47 the articulation 50 is situated, by means of which the scissors are supported on the basic frame.
The second scissors arm 48 is articulated on a glider 56, which is guided in the basic frame horizontally movable.
The foot frame connector 21, which in the articulations 10, 11 connects the foot frame 6 to the back frame 7 at a small distance, is long enough to prevent wedging of fingers between the two frames.
Roughly parallel to the back frame 7, a control rod 22 is articulated in the articulation 13 on the head frame connector 20 and in the articulation 12 at a short handlebar 21A on the foot frame connector 21. The connecting line between the articulations 11, 13 in the shown, folded position runs above the articulation 12, so this position is maintained stable against a counteracting pressure T of the mattress. Only an impact in the direction of C to the bottom end of the bed can bring the articulation 12 above the dead-centre position, so that afterwards lifting, by a movement in the direction of F, initiates the further unfolding, which is facilitated by the spring 19 and the control rod 22, because this rod affects the articulation 13 in a place offset from the folding articulation 15.
The slot 27 is formed in a profile bar 23, which is attached, by means of a flange 28, to the frame tubular profile, for instance the profile of the foot frame 6, with screw connectors 5 or the like. Accordingly, if need be, upper straps of the mattress are also fastened to the frame, for example next to the fold in the range of the head frame connector 20,
In
The basic frame 90 consists of side frames 91, which are composed of tubular and angular material and are interconnected from side to side with crossbars 92. The corner brackets 75, 75A of the side frames 91 have lateral angular notches 76 which serve to hold cap studs of cushion arm rests in order to attach them.
Furthermore, appropriate plug receivers for affixing the back cushion part are inserted at the corner bracket 75 in the back area, and correspondingly a notch 76A is positioned in the front sided corner bracket 75A for appending a front panel. At the top ends a link plate is attached with a bearing 78 for a boomerang-shaped support angle 80, which on the other end is articulated on the back frame 7 near the head frame connector 20.
At the end of the support angle near the bearing 78 a short angle appendix 79 with cranks 84, 86 is mounted, which is directed to the head end and connected with the scissors spring 53, which on the other end is attached to the rear articulation 52 of the scissors arm 48. In such a way the support angle 80 is held in its higher support position for the back frame 7. On the other hand, in the folded lying position, like
The articulation of the support angle 80 on the back frame 7 consists of a stud 81, inserted in a slotted hole 82-83 parallel to the angle leg where it can be slid and rotated in a limited way. In the anterior end position 82 of the stud 81 the bed and scissors are stable in the lying position and securely held against sliding and bending. For folding, the stud 81 has to be actuated in the rear position 83 of the slotted hole by lifting the foot and back frame 6, 7, and then rotating the support angle 80, so that the scissors 47, 48 begin to fold in. Only then the frame connectors 20, 21 can be folded, as described with the first described variant.
For a further stabilization of the two folding positions, the legs at bottom end 33B are firmly connected with the foot frame 6. In folded state, the legs 33B stand behind the basic frame crossbar 92 within the basic frame 90 on the floor and there support the foot frame 6 firmly, as
In addition, the rear end of the back frame 7 in folded condition rests on a basic frame support 77. This support 77 catches in an elastic manner with the back frame 7.
The connectors 20, 21 of the frames 8, 7; 7, 6 are provided with protective caps 95, 96, 97, which in
The two frame supports T3 have the form of a female connector and are vaulted by protecting and stiffening bends S1, S2. In the strutted bends attach drill holes S3 are formed for the cladding pins. The appendix T8 extends parallel to the attach shank T1, comprising mounting drill holes T5, T2 for locking parts.
On the other side of the shank T1 an attachment aperture T6 for an articulation 71 of a damper 72 is inserted, said aperture being reinforced by the bend S2.
Number | Date | Country | Kind |
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10 2005 033 053.3 | Jul 2005 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2006/006909 | 7/14/2006 | WO | 00 | 7/7/2008 |