Patent Publication Number: US-2007095618-A1

Title: Structure to operate and to dismantle/assemble dual-use sickbed and wheel chair

Description:
BACKGROUND OF THE INVENTION  
      1) Field of the Invention  
      This invention relates to an improved structure to operate and to dismantle/assemble dual-use sickbed and wheel chair, wherein chair back and mat can be elevated in reverse direction. Either adjust chair back upward or downward, user can hold chair back with one hand while another hand pull up lever (or hold right brake crank) or L-pull rod (or hold left brake crank) so as to adjust angle of bed and chair back properly. Furthermore, chair back, mat and armrest can be dismantled from chair seat, so, it can occupy less room in packing and operate easily.  
      2) Description of the Prior Art  
      Usually, the medical facilities for patient to sit down and sleep include sickbed and wheel chair, however, above said two types of medical facility are solely applied, so, it is inconvenient to use since they can not be applied together. If want to help wash patient, you must first push patient to ablution field with wheel chair, then carry patient to ablution unit. At end of wash, you once again carry patient into wheel chair and push patient into sickroom, then take back sickbed. Such movements may cause patient to feel discomfort or collide the sore parts. Moreover, it may aggravate burden of nursing dependents or personnel.  
      In view of above said shortage, inventor of this invention has finally invented this improved structure to operate and to dismantle/assemble dual-use sickbed and wheel chair after years research.  
     SUMMARY OF THE INVENTION  
      An improved structure to operate and to dismantle/assemble dual-use sickbed and wheel chair, wherein shaft of block structure is fixed at lever or at bottom of lever basing on right cable housing of right brake crank, and another end protrudes into position hole of disc gear; L-pull rod of gear shift is pushed against ratchet of disc gear or fixed at L-pull rod by left cable housing of left brake crank, hold left brake crank to prevent L-pull rod from dropping off disc gear, so that disc gear can only rotate in single direction. As disc gear drives chair back to rotate, main link rod can run at the same time so that passive rod and connection rod drive chair back to rotate in reverse direction, chair back and mat elevate also in reverse direction; thus, either adjust chair back upward or downward, user can hold chair back with one hand while another hand pull lever or L-pull rod, or hold left &amp;right brake handle to pull L-pull rod or lever, thereby, chair back or mat can be adjusted properly at any time. Such structure can be operated easily and also applied to sickbed and wheel chair. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is the exploded view of this invention.  
       FIG. 1 -A is the plane section of block structure.  
       FIG. 1 -B is another embodiment view of disc gear.  
       FIG. 2  is the exploded combination view of this invention.  
       FIG. 3 -A is the side view of disc gear of this invention.  
       FIG. 3 -B is the embodiment view of block structure in blocking state.  
       FIG. 3 -C is the embodiment view of block structure in release state.  
       FIG. 4 -A is the embodiment view of bed &amp; chair in lying-down state.  
       FIG. 4 -B is the embodiment view of bed &amp; chair in sitting-up state.  
       FIG. 5  is the disassembled sketch map of structure of this invention.  
       FIG. 5 -A is the palletized sketch map of shrunk cubage of this invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Please refer to  FIG. 1  and  FIG. 2  for detailed structure of this invention. This invention is comprised by bed &amp; chair  1 , disc gear  2 , block structure  3 , check structure  4  and linkage structure  5  to let chair back and mat elevate in reverse direction; wherein  
      Hemicycle disc gear  2  is fixed at chair back  11  of bed &amp; chair, position hole  21  is set on disc gear  2 , and position holes  21  are arranged in slanting (as shown in  FIG. 1 -B) so as to embed shaft  32  of block structure into the said holes, which is in cut block with shaft;  
      Block structure is comprised by external bushing  31  of side board  12  passing through bed &amp;chair, shaft  32  fixed at lever  34  covering onto external bushing  31  and spring  33  covering onto shaft  32  and external bushing  31  (as shown in  FIG. 1 -A). In addition, after spring  33  is covered onto shaft  32 , extend one ring  321  at proper position of shaft, another end of shaft  32  protrudes into position hole  21  of disc gear  2  in slanting so that disc gear is pushed against shaft  32  to compress spring  33  slightly along gradient when rotating, which is in cut block with shaft  32 ;  
      Check structure  4  is to cover bushing  41  onto horizontal rod  121  at chair seat of bed &amp; chair in advance, L-pull rod  42  is vertically fixed at bushing  41 , in addition, a torque spring  43  is also fixed around horizontal rod  121 , another end of torque spring  43  hooks L-pull rod  42 ; vertical top of L-pull rod  42  is pushed against ratchet  22  of disc gear  2  so as to block disc gear  2  from rotating; linkage structure  5  is comprised by active rod  51  fixed on disc gear  2 , passive rod  52  fixed at side of mat  13  and connection rod connected between active/passive rod; active rod  5  may move at the same time when disc gear  2  drives chair back  11  to rotate, so that passive rod  52  and connection rod  53  drive mat  13  to rotate in reverse direction;  
      Please refer to  FIG. 3  and  FIG. 4  for movement mode, if want to ascend chair back  11 , must push lever  34  outward so that shaft  32  compresses spring  33  to pull out position hole  21  of disc gear, thereby, user can adjust chair back  11  upward, and ratchet  22  of disc gear can slide along L-pull rod  42  in single direction, chair back  11  can only ascend but not descend due to block of L-pull rod  42  (because L-pull rod moves forward from lower end of ratchet to high end, so, high end is blocked in reverse direction and cannot move); mat  13  is pulled downward by active/passive rod  51 / 52  of linkage structure, when it is adjusted to the required position, please release lever  34  so that shaft  32  is pushed back its original position to embed into position hole  21  of disc gear  2 , chair back  11  and mat  13  are positioned actually (as shown in  FIG. 3 -B and  FIG. 4 -A);  
      User must pull down L-pull rod  42  in advance when descending chair back  11 , so that L-pull rod  42  pulls torque spring  43  properly to let it drop off disc gear  2 , user can descend chair back  11 , disc gear  2  is blocked into shaft  32  of position hole  21  of disc gear when rotating, push shaft  32  to compress spring  33  along gradient of position hole  21  (move from low end  211  to high end  212 , high end is blocked in reverse direction and cannot move), shaft  32  is in cut blocking state that can prevent chair back from folding down quickly, mat  13  is pulled upward by active/passive rod  51 / 52  of linkage structure, when it is adjusted to the required position, please release lever  34  so that L-pull rod  42  is pulled by torque spring  43  to return to its original position, so, chair back and mat are positioned actually (as shown in  FIG. 3 -C and  FIG. 4 -B);  
      When chair back  11  is ascending, L-pull rod  42  moves from low end to high end of ratchet  22 , so that disc gear  2  can only rotate in single direction, high end of ratchet  2  is blocked in reverse direction and cannot descend, therefore, even if left go of it when adjusting chair back  11 , it couldn fold down quickly.  
      Either ascend or descend chair back  11 , user can hold chair back  11  with one hand while another hand pulls lever  34  or L-pull rod  42  so as to position angle of bed &amp; chair  1 , therefore, such structure can be operated easily and also applied to sickbed and wheel chair.  
      Please refer to  FIG. 2 , left/right brake crank  101 / 201  is respectively fixed at left/right handle  10 / 20  of above said bed &amp; chair, and left/right cable housing  102 / 202  are limited by relay position base  30  so that left cable housing  102  is fixed at front of above said L-pull rod  42  and right cable housing  202  is fixed at bottom of lever  34 , user can hold left crank  101  to control L-pull rod  42  and hold right crank  201  to control lever  34 , so, to control left/right brake crank  101 / 201  is equal to controlling L-pull rod and lever  34  directly, therefore, such structure is easy to operate.  
      Furthermore, please refer to  FIG. 5  and  FIG. 5 -A, chair back  11 , mat  13  and armrest  14  in this invention can be dismantled from chair seat  12  respectively, so that cubage of whole structure can be shrunk if properly palletized, packaging and transporting materials may be further reduced accordingly, therefore, it will occupy less room (please refer to  FIG. 5 -A for cubage shrinking).