JP5479920B2 - Overbed table - Google Patents

Description

  The present invention relates to an overbed table disposed on a hospital bed or the like, and more specifically, a grip portion is provided when the user of the overbed table raises the upper body, and a twin-wheel caster is provided so as not to move the overbed table. The present invention relates to a fixing mechanism that is in a locked state or a unlocked state.

Conventionally, an overbed has been arranged in a hospital bed, etc., and the table leg has two frames arranged in parallel, with two or three lock levers at the end of each frame. Casters are provided, and a total of 4 to 5 casters are provided. The leg frame is inserted into the space on both sides of the bed and used as a table for meals and the like. By the way, there is usually no caster lock in the overbed table, and even if a hand is held on the table plate of the overbed table, the overbed table can easily move, causing an unexpected accident to the user. Therefore, conventionally, hospitals and the like have instructed a user to avoid gripping an overbed table when the user wakes up from the bed or stands up.
On the other hand, for example, as disclosed in Patent Document 1, a stopper mechanism has also been proposed. However, the stopper attached to each caster on both sides of the bed is operated by a toe or the like to fix and lock the overbed table. What to do has been proposed.
In addition, in the overbed table, the pair of left and right legs and the legs are separated from each other with the bed in between, so simultaneous locking is difficult. As the mechanism for simultaneously locking or unlocking, mechanisms such as Patent Document 2 and Patent Document 3 have been proposed by the present applicants.

JP 2003-135182 A Japanese Patent Application No. 2009-172725 Japanese Patent Application No. 2009-204131

By the way, the locking mechanism of the overbed table disclosed in Patent Document 1 is basically painful for nurses and bed users to operate on the floor, and requires a considerable amount of force for locking. In addition, there is an annoyance that it is necessary to perform the operation several times on both sides of the bed, and it is particularly troublesome work for busy nurses. The four casters are simultaneously locked and unlocked.
Thus, if the overbed table is easily maintained in a fixed state, it is not necessary to instruct the user to avoid grasping the overbed table as much as possible in hospitals, etc. Using the overbed table, it is possible to wake up the upper body by itself when eating.
The subject of this invention is providing the overbed table provided with the holding part which makes it possible to raise an upper body by itself using an overbed table.

In order to solve the above-mentioned problems, the invention of claim 1 is an overbed table in which the table can be freely raised and lowered, and all casters can be locked and unlocked simultaneously at one caster operation section on the table. In an overbed table where the table is fixed to the floor when the caster is locked, the caster operation unit locks and unlocks each caster using a coaxial operation transmission wire, and lifts and lowers the table. The storage of the relaxed part of the branch wire, which is the operation transmission wire, is absorbed by the hollow part of the table or the storage part on the bottom , and is gripped by hand to help the user wake up the upper body at a predetermined position on the table. A gripping portion that is easy to do is fixed and provided.
According to a second aspect of the present invention, in the overbed table according to the first aspect of the invention, one operation wire that is an operation transmission wire from the caster operation portion is branched into four branch wires, and the four wheel locks are branched. It is connected to a mechanism, and the forward / backward movement by the inner wire of the one operation wire is transmitted as the forward / backward movement by the inner wire of the four branch wires .
According to a third aspect of the present invention, in the overbed table according to the first or second aspect, the grip portion is a grip having a shape that can be wrapped with a palm .
According to a fourth aspect of the present invention, in the overbed table according to the first or second aspect, the gripping portion is a cylinder having large irregularities in the vertical direction.
According to a fifth aspect of the present invention, in the overbed table according to any one of the first to fourth aspects , the entire circumference of the table edge portion of the overbed table is increased so that liquid may spill from the table. It is characterized by preventing it from dripping .

In order to solve the above problems, according to the invention of the overbed table of claim 1 , all casters of the overbed table can be locked and released by one operation, and each caster can There is no need to lock, especially because it can reduce the labor of busy nurses and users, and the table is equipped with a caster operation section, so that the bed user's patients can reach even if they are in bed And can be easily operated by patients and nurses. Furthermore, since the caster operating part is on the table, the locked state and the released state of the twin wheel caster can be confirmed at a glance. If it is in the locked state, the user can raise his / her upper body by himself / herself using the gripping part with peace of mind or can help when standing up.
In addition, a storage section (reservoir section) that requires a large space for the relaxation of the branch wire that accompanies the lifting and lowering of the table is provided under the table, so the overall design is compact and there are no restrictions on the design and the design is clean. Thus, the length of the branch wire to each caster can be made substantially equal, and the caster can be locked and unlocked uniformly.
According to the invention of the overbed table of claim 2 , one operation wire from the caster operation section is branched into four branch wires and connected to the four wheel lock mechanisms, and the one operation wire Since the forward / backward movement by the inner wire is transmitted as the forward / backward movement by the inner wires of the four branch wires, all casters can be simultaneously locked and released without using a complicated mechanism.
According to the invention of the overbed table of claims 3 and 4 , a gripping part such as a grip or a handle that can be easily gripped by a user is fixed at a predetermined position, and this gripping part is used at the time of a meal or the like. You can use it to help yourself to wake up or stand up.
According to the invention of the overbed table of claim 5 , even if the user grasps the grip portion and the table is slightly shaken and the liquid overflows from the container, the entire circumference of the edge of the table is increased. Even if it spills, it will not drip from the table.

In the overbed table of the embodiment of the present invention, in a state where the two-wheel casters of the caster operation unit are locked, the external perspective view in a state of being safely held by the grip unit, Rear view of FIG. In the overbed table of the embodiment of the present invention, an external perspective view in a state in which the two-wheel casters of the caster operation unit are unlocked, Rear view of FIG. FIG. 1 is an external perspective view of the overbed table of FIG. 1 in a state in which the table unit is lowered and the two-wheel caster of the caster operation unit is locked. Top view of FIG. 7 (a) is a cross-sectional top view of the wire storage mechanism in the hollow portion of the table portion, FIG. 7 (b) is a vertical cross-sectional view taken along the line bb of FIG. 7 (a), The top view of the back of the leg in the overbed table of the embodiment, Front view of the internal mechanism of the caster operation unit with the twin wheel caster unlocked, The front view of the internal mechanism of the caster operation part of the locked state in FIG. 1 is an overall configuration diagram of the operation transmission mechanism of FIG. FIG. 11 is an enlarged exploded view of the operation wire in part A of FIG. FIG. 11 is an enlarged exploded side view of the branch wire of part B, 13 (a) is a side view, 13 (b) is a top view thereof, 14 (a) is a front view of the inside of the branch board of FIG. 11, FIG. 14 (b) is a cross-sectional view of the branch board taken along line bb of FIG. 15 (a) is a cross-sectional view of the slider in the switchboard taken along line 14 (a) a-a, FIG. 15 (b) is a cross-sectional view taken along line 14 (a) c-c, FIG. 1 is a schematic external perspective view of the twin-wheel caster of FIG. It is a figure of one wheel part of a twin-wheel caster, Fig.17 (a) is the front view, FIG.17 (b) is the side view. FIG. 18 (a) is a front perspective view of a state in which the knock member is raised and the tooth portion 542 is fitted to the internal gear 45, and FIG. 18 (b) is its knock. Side perspective view of the member, A sectional view taken along line (a)-(a) of FIG. 20 (a) is a front perspective view of the two-wheel caster in the unlocked state, and FIG. 20 (b) is a side perspective view of the knock member. A plan view from above of the caster mounting bracket of FIG. A perspective view of the base portion 541 of the wheel tooth meshing lock portion 54, FIG. 23A is a front view, FIG. 23B is a side view, FIG. 23C is a top view, and FIG. A perspective view of another embodiment of the gripping part, It is a perspective view of other Example of a holding part.

The present invention is an overbed table in which legs are separated with a bed in between,
A mechanism that allows a user to use a gripping portion that can be used by a user at a predetermined position of the overbed table and locks or unlocks all casters at the same time so that the user can get up and move without being moved. This is realized by providing a wire cable and a storage portion for relaxing the branch wire accompanying the raising and lowering of the table in the hollow or bottom surface of the table. Now, preferred embodiments of the overbed table of the present invention will be described with reference to the drawings.

(Table part and support part)
1 and FIG. 2, which is a rear view thereof, are diagrams showing the entire state in which the handle portion 21 of the caster operation portion 2 of the overbed table 1 is lowered and flattened, and the overbed table 1 is locked in the two-wheel caster. FIG. 4 which is a rear view of the caster operation unit 2 is a diagram showing the entire state in which the overbed table 1 is movable with the handle unit 21 of the caster operation unit 2 in the unlocked state and the overbed table 1 being movable. It is a figure which shows the whole of the state which lowers the table part 11 of the overbed table 1, and locks a twin-wheel caster.
As shown in these drawings, the overbed table 1 is disposed on a bed D such as a hospital with the bed D in between. The overbed table 1 mainly includes an upper table portion 11 and a pair supporting the same. The post portion 12 (12a, 12b) and the corresponding leg portion 13 (13a, 13b).
The upper surface of the table unit 11 is kept flat and horizontal, and is used for meals and the like. The table unit 11 is supported at both ends by a pair of telescopic column units 12, and the pair of column units 12. In general, in order to adjust the height of the table portion 11 located on the bed D, the table portion 11 can be expanded and contracted, and the length of the column portion 12 is adjusted by the height adjusting lever 121.
The column portion 12 includes a table support portion 122 of an upper quadrangular column and a base portion 123 of a small-diameter quadrangular column that fits and slides inside the support portion 122, and a foundation to the support portion 122 by a height adjustment lever 121. The fitting degree of the part 123, that is, the height of the table part 11 is adjusted.
Further, an edge 111 (see h in FIG. 7) that is slightly higher than the table 11 is provided on the entire periphery of the edge of the table 11, and the user grips the grip 16 and the table is slightly shaken. Even if the liquid overflows, the entire circumference of the edge 111 of the table portion 11 is raised, so that even if the liquid spills on the table, it does not drip from the table.

The base portion 123 is fixed by a column fixing member 131 provided on the leg portion 13. This support fixing member 131 may be appropriately designed according to the shape of the various support sections 12 of the overbed table 1 to be used, and can usually be applied to many overbed tables.
Further, as shown in FIG. 1, the column fixing member 131 protrudes outward from the caster mounting frame main bodies 132, 132a and 132b. This is because the column fixing member 131 is arranged outside the bed D, but the caster mounting frame 131 The main bodies 132, 132a, and 132b are arranged so as to be positioned below the bed D, and are prevented from protruding outside the bed D as much as possible so that the user does not trip.
The pair of leg portions 13 are connected to the column portions 12 (12a, 12b) and the table portion 11 corresponding thereto, and each leg portion 13 is composed of a caster mounting frame main body 132a, 132b, respectively. 1), the two-wheel casters 4a, 4b are attached in the vicinity of both ends of the caster mounting frame main body 132a, and the two-wheel casters 4c, 4d are also installed in the vicinity of both ends of the caster mounting frame main body 132b of the leg portion 13b (see FIG. 1). When the overbed table 1 is moved, all of the twin wheel casters 4a to 4d are unlocked, and are locked in the locked state so that the overbed table 1 does not move or fall over. .

(Grip part)
As shown in FIGS. 1 to 5, a grip 16 is fixed to a predetermined position of the overbed table 1, in this embodiment, in front of the right end as viewed from the user. The grip 16 is a grip (grip) 16 that can be easily gripped by the user of the bed, wraps it in the palm of the hand, and raises the user's upper body by himself / herself during a meal or the like. Or help you get up.
The gripping portion 16 need not be limited to the grip shape of the present embodiment, and may be any shape that can be gripped when the user gets up. For example, another embodiment 2 is shown in FIG. As shown in FIG. 25, as shown in FIG. 25, the handle 16a may be a handle 16a that is a cylinder having a large uneven grip in the vertical direction as seen in the stock holding portion of the ski. A longitudinal long hole shape 16b in which a visible hand can enter may be provided in the lateral direction on the front side of the table edge.

(Wire storage mechanism)
As shown in FIGS. 6 and 7, a caster operation unit 2 is provided at an appropriate position of the table edge 111 within the reach of the patient of the bed user of the table unit 11 even if the patient is on the bed. The caster operation unit 2 is preferably positioned so that a patient, a nurse, or the like can easily operate.
As shown in FIG. 7, the table portion 11 is formed with a hollow portion 112, and a wire storage mechanism 14 for storing the operation transmission wires 30 (31, 33) such as the operation wires 31 and the branch wires 33 and the wire branch board 32 is provided. In the center of the wire storage mechanism 14, a wire branch board 32 for branching one operation wire 31 into four branch wires 33 is provided, and one of the wire branch boards 32 is connected to the caster operation section 2. In the state shown by the dotted line C in FIG. 7, the connection is made by the operation wire 31, and the other is connected to the four branch wires 33.

The branch wire 33 is divided into two branch wires 33a and 33b connected to the twin wheel casters 4a and 4b, and two branch wires 33c and 33d connected to the twin wheel casters 4c and 4d. It is inserted into a wire guide hole 151 that is connected to an expandable pipe 15 that forms a wire guide portion accommodated in 12a and 12b.
The telescopic pipe 15 is composed of a hollow upper pipe 15a having a slightly larger diameter at the upper part and a hollow lower pipe 15b having a slightly smaller diameter at the lower part, and the lower pipe 15b is inserted into a hollow inner hole of the upper pipe 15a. The upper pipe 15a can be slid up and down, the upper end of the upper pipe 15a is fixed to the bottom of the table portion 11, the lower end of the lower pipe 15b is fixed to the upper surface of the leg portion 13, and two branch wires 33 are inserted and guided into the hollow portion. ing. In addition, the upper end of the upper pipe 15a is provided with a curved guide portion (not shown) so that the branch wire 33 that relaxes in the vicinity of the joint with the wire guide hole 151 of the table portion 11 can be easily put in and out. .
The two sets of branch wires (33a, 33b) and (33c, 33d) repeat the state of relaxation and no relaxation as the table part 11 is raised and lowered. When the table part 11 is lowered, the line A in FIG. When the relaxed portion is stored in the hollow portion 112 and the table portion 11 is lifted, the state becomes as shown by a one-dot chain line B in FIG. 7, and the branch wire that is not relaxed is stored. Note that a guide wall 141 is disposed at an appropriate position of the hollow portion 112 so as to be smoothly curved when the branch wire 33 is relaxed.

The telescopic pipe 15 forming the wire guide portion is housed inside the table support column 12 that expands and contracts as the table unit 11 moves up and down, and is provided in parallel to the table support column 12, and its height is expanded and contracted. It is the same height (length) in synchronization with the table support column 12 to be performed. Of course, the telescopic pipe 15 is not limited in that the branch wire 33 accompanying the lifting and lowering of the table is loosened in the vicinity of the table column, and the operation may be smooth.
It is branched into four at the wire branching board 32 from the caster operating part 2 of the table part 11, and further divided into two sets of branch wires (33a, 33b) and (33c, 33d), respectively, and the expansion pipes 15 (15a, 15b 8, the leg portions 13 (13 a, 13 b) are guided from the wire communication through holes 134 a, 134 b at the lower end of the expansion pipe 15 and connected to the twin wheel casters 4 a to 4 d as shown in FIG. 8.
By the way, by providing the caster operation part 2 in the table part 11, the wire branch board 32 can be fixed to the hollow part 112 of the table part 11 in a free position, so that the branch wires 33 to the twin-wheel casters 4a to 4d are provided. The lengths can be substantially equal, and the locking and unlocking operation of the twin wheel caster can be performed uniformly.

  By operating the caster operation unit 2 on the table unit 11, as will be described in detail later, each of the four twin wheel casters 4 is connected via the operation transmission mechanism 3 using coaxial wires of an inner wire and an outer wire. The wheel lock mechanism 5 is operated. This operation wire is the same as a brake wire for bicycles and the like, and consists of a core inner wire and an outer wire that covers and fixes both ends. By pulling up 21 (lever), the inner wire is pulled to release the lock of the wheel lock mechanism 5 of the two-wheel caster 4, and conversely, the handle portion 21 is lowered and locked by the spring of the wheel lock mechanism 5.

(Caster operation part of caster)
The details of the following operation structure will be described.
FIGS. 1 and 2 are external perspective views in which four twin-wheel casters are locked in the caster operation unit 2, and FIGS. 3 and 4 are external perspective views in the released state. Details will be described.
First, FIG. 3 and FIG. 4 in a state where the locks of the four twin-wheel casters are released will be described with reference to FIG. 9 showing the internal mechanism. The caster operation unit 2 mainly includes the handle unit 21 and the release maintaining mechanism 22. , A release button 23, and a frame 25.
In FIG. 9, in the handle portion 21, a rotating body portion 212 rotates around a rotating shaft 211, and a convex portion 213 is provided on a part of the outer periphery of the rotating body portion 212. This is restricted by the rotation restriction range of the groove portion 252 provided in the body storage portion 251.
A locking portion that locks the end portion 311 of the inner wire 312 called a tie on the operation portion side of the operation wire 31 of the operation transmission mechanism 3 is provided at a rotating portion in the vicinity of the rotation shaft 211 of the rotation barrel portion 212. 214 is provided, and this locking portion 214 is fixed to a locking portion 256 provided at an appropriate position of the frame 25, and locks the end portion 311 to the locking portion 214 along the terminal portion introduction groove 215. I am doing so. The handle portion 21 (front surface) is provided with a grip portion 217 into which a finger of a hand can be inserted. As shown in FIG. 9, when the handle portion 217 of the handle portion 21 is pulled up and pulled up, the locking portion 214 is also rotated upward. The end portion 311 of the moving operation wire 31 is also drawn (drawn to the left in FIG. 9).

When the handle portion 21 is pulled up, the sector gear 216 provided on the lower peripheral surface of the rotating body portion 212 rotates clockwise in FIG. 9, and the sector gear 216 is moved to the sector gear 216 as the sector gear 216 rotates. The meshing idle gear 218 is rotated counterclockwise. The idle gear 218 rotates around a shaft 2181 provided on the frame 25, but a slide member 219 that slides left and right is provided below the idle gear 218, and meshes with a tooth row 2191 of the slide member 219. Then, the slide member 219 is moved to the right side in FIG. Note that the slide member 219 is restricted so as to move only in the left-right direction by a restriction portion 253 provided in the frame 25.
The slide member 219 is always pushed to the left side by the pressure spring 2193 at the right end 2192. In the case of unlocking, the slide member 219 is moved forward with the pressing force of the pressure spring 2193 by raising the handle portion 21. 219 moves to the left.
A lock member locking hole 2195 is provided in the vicinity of the left end portion 2194 of the slide member 219. When the lock member locking hole 2195 moves a predetermined distance, the distal end portion of the lower end of the lock member 221 of the release maintaining mechanism 22 2211 is fitted into the lock member engaging hole 2195.
The release maintaining mechanism 22 is provided with a rotating member 223 around the rotating shaft 222, one end 2231 is in contact with the lower end portion 232 of the operating rod 231 provided on the bottom surface of the release button 23, and the other end 2232 Supports the lock member 221 with a support shaft 2234 in the through hole 2233.
The lock member 221 described above is provided on the frame body 25 and is restricted only in the vertical direction by the restriction portion 254, and the upper end portion 2212 of the lock member 221 is provided with a pressing spring 2213 that always presses downward.

Further, on the side portion 2196 of the slide member 219, as will be described later, a shock absorber 2197 is provided with a frame body 25 so that the grip portion 217 of the handle portion 21 does not drop suddenly when shifting from the unlocked state to the locked state. Between the side and the shock absorber 2197.
Therefore, the handle portion 21 is pulled up until the distal end portion 2211 of the lock member 221 is fitted into the lock member locking hole 2195, and this position is maintained by the fitting of the lock member locking hole 2195. That is, the state in which the inner wire 312 is pulled is maintained, and as a result, the knock member 531 (see FIG. 20) provided in the twin wheel caster 4 is pushed down, and the tooth portion 542 of the base portion 541 interlocked with the knock member 531 is moved. The pull-down fitting is released from the caster internal gear 45 (see FIG. 16), and the lock in the normal state of FIGS. 1, 2, and 5 is released, and this released state is maintained.
The release maintaining mechanism 22 cooperates with the release button 23. In order to put the twin wheel caster 4 into the unlocked state, first, the handle portion 21 of the caster operation unit 2 is raised upward. The tip end protrudes from the upper surface portion 255 of the frame 25.
Note that the release button 23 may be a conspicuous color, for example, red or green, for invoking a dangerous state in order to function more effectively as a release display button.

Next, when the wheel portions 41 of the four twin wheel casters 4 are locked as shown in FIGS. 1, 2 and 5, the internal mechanism will be described with reference to FIG. When the portion 233 is pressed down, the lower end 232 of the operating rod 231 provided at the bottom of the release button 23 pushes the one end 2231 of the rotating member 223 down, and the other end 2232 on the opposite side of the rotating shaft 222 The front end 2211 of the lock member 221 is pulled up from the lock member engagement hole 2195 of the slide member 219 by raising the pressure spring 2213 against the downward pressing force.
When the engagement of the tip portion 2211 is released, the slide member 219 is moved to the left side by the pressing spring 2193 that always presses the left side in FIG. 10, and the slide member 219 moves through the tooth row 2191, the idle gear 218, and the sector gear 216. The handle portion 21 is lowered as shown in FIG. 10, and the upper end surface of the handle portion 21 becomes flat at substantially the same level as the surface of the frame upper end portion 135 of the caster operating portion 2, and FIGS. It becomes the state of 10.
When the handle portion 21 suddenly returns and generates noise due to the pulling force of the spring, the return speed may be reduced by the shock absorber 2197 shown in FIGS. One end of the absorber 2197 is fixed to a proper position of the frame body 25, and the other end is fixed to a proper position of the slide member 219.

(Operation transmission mechanism)
As shown in FIG. 11, the operation transmission mechanism 3 uses a coaxial so-called lock wire composed of a core inner wire and an outer wire which is also a covering portion and is mainly composed of an operation wire 31 and a wire branch board 32. And four branch wires 33.
The operation wire 31 attached to the caster operation unit 2 is composed of a core inner wire 312 and a covering unit 313 which is an outer wire covering the inner wire 312 as shown in FIG. The distal end of the wire 312 is provided with an end portion 311 called a so-called columnar shape, the mounting portion 314 is provided at the distal end of the covering portion 313, and the inner wire 312 is connected to the end portion 311 with respect to the mounting fixing portion 314. The other end 316 (see FIG. 14) is connected to the slider 322 (see FIG. 14) of the wire branch board 32.
The lengths of the four branch wires 33 from the wire branch board 32 are substantially equal, and FIG. 13 (a) is a side view of FIG. 13 (a) which is an enlarged view of the end portion B in FIG. As shown in (b), it consists of a core inner wire 332 and a covering portion 333 covering it, and a distal end portion 331 having an engagement hole at the center is provided at the tip of the wire 332, and at the tip of the covering portion 333 An attachment fixing part 334 is provided, the inner wire 332 is configured to be able to advance and retract with respect to the attachment fixing part 334, and the other end is connected to the wire branch board 32.

As shown in FIGS. 14A and 14B, the wire branching board 32 of the wire branching mechanism connects the operation wire 31 and the four branching wires 33, and the wire branching board 32 of FIG. Inside the lid 321 (FIG. 14B), a slider 322 is accommodated so as to be movable left and right. An attachment fixing portion 315 of the operation wire 31 is attached to the side plate 323 on the operation wire 31 side of the wire branch board 32, and a fitting portion 3221 of the end portion 316 of the wire is provided on the operation wire 31 side of the slider 322. Mating.
Further, the fixing portion 335 of the branch wire 33 is attached to the side plate 324 on the side of the four branch wires 33 of the wire branch board 32, and the end portion 336 of the four wires is fitted to the branch wire 33 side of the slider 322. A portion 3222 is provided to engage the end portion 336. Thus, when the terminal portion 316 of the operation wire 31 is pulled, the slider 322 moves to the side plate 323 side (FIG. 14 (a): right direction), but the four end portions fitted to the slider 322 are used. 336 also moves away from the side plate 324 in a lump (FIG. 14 (a): right direction).

As shown in the cross-sectional view along the line aa in FIG. 14 (a) in FIG. 15 (a) and the cross-sectional view along the line cc in FIG. 14 (a) in FIG. 15 (b), there are four sliders 322. If the movement distances of the end portions 336 of the inner wires are not the same, the four twin wheel casters 4 cannot be locked accurately. Therefore, a plurality of peak portions 3223 parallel to the moving direction of the upper surface of the slider 322 are provided, and as shown in the side view in which the lid 321 of FIG. A groove 3211 is provided on the lid 321 so that the slider 322 accurately translates with respect to the wire axis. Of course, conversely, a parallel peak may be provided on the lid 321 and a corresponding guide groove may be provided on the slider. A fixing convex portion 3212 is inserted and fixed to the inner wall of the wire branch board 32 on the fitting side surface of the lid 321.
Therefore, as a parallel advance / retreat movement means for moving the slider 322 in parallel with the advance / retreat direction of the inner wires 312, 332, as well as the both side walls inside the wire branch board 32, this alone is not sufficient for parallel movement. Therefore, a plurality of parallel ridges 3223 are provided on the upper surface of the slider 322, and guide grooves 3211 for guiding the ridges 3223 in the left-right direction are also provided on the lid 321 side.

Thus, the forward / backward movement of the operation wire 31 is transmitted to the four branch wires 33 via the wire branch board 32. Moreover, since the coaxial wire was used for operation transmission, as shown in FIG. 8, the position of the four twin-wheel casters 4 of the leg portion 13 of the overbed table 1 can be freely set. Unlike the grounding member for lifting the entire table as in the above-mentioned Patent Document 1, the structure is simple, the production cost is low, and the maintenance is easy. In addition, since one operation wire 31 is branched into four, the four casters can be accurately locked and unlocked at the same time with an extremely simple configuration, and the wire branch board 32 is also thin and flat. Since it can be molded, the height of the wire branching mechanism can be made low and thin, so that it can be stored in the hollow portion 112 of the overbed table 1 or attached to the bottom of the table portion 11.
In other words, one operation wire 31 from the caster operation unit 2 is branched into four branch wires 33 and connected to a caster operation mechanism that is four wheel lock mechanisms 5, and the inner of one operation wire 31 is connected. The forward / backward movement of the wire 312 is transmitted to the forward / backward movement of the inner wire 332 of the four branch wires 33. In order to branch to the four branch wires 33, a wire branch board 32 is provided as a wire branch mechanism. The branch board 32 is provided with a slider 322 for fixing the four terminal portions 331 in parallel, and the slider 322 can be moved and transmitted accurately in parallel with the forward and backward directions of the inner wires 312 and 332.

(Arrangement of twin wheel casters)
FIG. 8 described above is a plan view of the back surface of the leg portion 13 of the overbed table 1, and a pair of caster mounting frame bodies 132a, b and a pair of twin wheel casters 4 (4a, 4b, 4c, 4d) across the bed D. In the present embodiment, the caster mounting frame main bodies 132a and 132b are arranged so as to be pulled into the bed D side.
The outline of the appearance of these casters 4 is as shown in FIG. 16, and although the details of the configuration of the casters 4 will be described later, a pair of wheels are provided on both sides of the lock mechanism frame 51 of the wheel lock mechanism 5 which is a caster operating mechanism. 41A and 41B are rotatably supported, and a turning support 52 is provided on the upper surface of the lock mechanism frame 51 for pivotally supporting the caster 4 with respect to the mounting frame. A knock member 531 that moves up and down is provided coaxially with the axis X of the portion 52. When the knock member 531 is pushed up by the pressing spring 543, the two-wheel caster 4 is locked and the wheel 41 cannot rotate. On the contrary, when the knock member 531 is lifted up and released downward, the tooth portion 542 to the internal gear 45 of the double wheel caster 4 is released, the lock is released, and the double wheel can freely rotate.
By the way, the twin-wheel casters 4 (4a, 4b, 4c, 4d) used in this embodiment are more stable than the single-wheel casters because the width of the twin wheels is wider than that of the single wheels. Locking can prevent turning because of the wide width of the twin wheels as well as the direction of travel.
Therefore, as in this embodiment, when the four casters are locked, even if the lock mechanism of one of the four casters is incomplete or damaged, the overbed table is surely secured. Can be fixed and released.

(Caster wheel)
The wheel portion 41 of the above-described twin wheel caster 4 will be described. As shown in FIG. 16, one wheel portion 41 (41A, 41B) is arranged on each side of each of the four twin wheel casters 4, As shown in FIG. 17, in one wheel portion 41, the wheel shaft 42 is rotatably supported by a wheel bearing portion 511 of the wheel lock mechanism 5 (see FIG. 18), and the wheel shaft fixing portion 43 of the wheel portion 41 is supported. (The wheel shaft fixing portion 43 may be configured to rotatably support the wheel). The outer ring 44 of the wheel portion 41 is made of rubber and absorbs vibrations, smoothes running, reduces noise, and strengthens the grip to the floor.
Also, an inner gear 45 coaxial with the wheel shaft is formed in the vicinity of the outer ring 44 inside the wheel portion 41 of the twin-wheel caster 4, and when a lock tooth portion 542, which will be described later, is lifted by a pressing spring 543, the inner gear The tooth portion 542 meshes with 45 to prevent the wheel portion 41 from rotating.

(Caster wheel lock mechanism)
As described with reference to FIG. 16, the caster of this embodiment is a twin-wheel caster of wheels 41 </ b> A and 41 </ b> B having a predetermined interval across the lock mechanism frame 51 of the wheel lock mechanism 5. Compared to the driving stability. Further, when both wheels (double wheels) of the wheels 41 (41A, 41B) are locked, the vehicle cannot travel and the turning of the caster is restricted. Further, as in this embodiment, the pair of legs 13 of the overbed table 1 is used. When the two wheel casters 4a and 4b at the two ends of the frame 132 and the wheels 41A and 41B of the two wheel casters 4c and 4d are fixed, the rotation of the wheels can be performed without fixing the turning of the caster 4 itself. It is found that the overbed table 1 is almost completely fixed only by fixing, and is based on this knowledge.

First, the wheel lock mechanism 5 of the twin wheel casters (4a to 4d) arranged on the caster mounting frame main body 132 will be described in more detail with reference to FIGS.
FIG. 18 is a view of the caster locked state, in which the knock member 531 is loosened by the branch wire 33, the slider cam 56 is moved to the left side by the coil spring 567, and the knock portion 53 is raised upward. 18 (a) is a cross-sectional view of the wheel lock mechanism 5, and FIG. 18 (b) is a side cross-sectional view of FIG. 18 (a). FIG. 19 is a cross-sectional view taken along the line aa in FIG. 19A, and shows a state in which the tooth portion 542 is fitted and locked to the internal gear 45 of the twin-wheel caster 4.
FIG. 20 is a diagram of the unlocked state of the twin-wheel caster 4 with the tooth portion 542 separated from the internal gear 45. The knock member 531 is pulled by the branch wire 33, and the slider cam 56 resists the tensile force of the coil spring 567. Is moved to the right side in the drawing, and the tooth portion 542 is lowered against the pressing spring 543 inside the caster, that is, the caster is unlocked. FIG. It is a top view from above.

  18 (a) and 18 (b) are diagrams showing the normal state of the overbed table 1, that is, the two-wheel caster 4 being locked by lowering the handle portion 21 in FIG. 1 (FIGS. 2, 5, and 10). In the frame 51 of the wheel lock mechanism 5, a turning support 52 is pivotally supported so that the two-wheel caster 4 can turn with respect to the caster mounting bracket 55, and a knock portion that moves up and down inside the turning support 52. 53 is provided, and the wheel tooth meshing lock portion 54 is connected to the knock portion 53 via a pressing spring 543. In the state where the tooth portion 542 is raised by the pressing force of the pressing spring 543 by the cam surface 561 of the slider cam 56 that moves the knock member 531 up and down, the wheel tooth meshing lock portion 54 also has the tooth portion 542 The tooth portion 542 is engaged with the internal gear 45 inside the wheel portion 41, the rotation of the wheels 41A and 41B is prevented, and the twin-wheel caster 4 is locked.

Here, the configuration of each part will be described in more detail. First, the lock mechanism frame 51 is molded of plastic, and as shown in FIG. 18, a wheel bearing 511 is provided at the center, and the frame 51 On the left side, a cylindrical fitting portion 512 into which the swivel support portion 52 (knock portion 53) is inserted and a storage portion 513 are arranged, and the portion of the fitting portion 512 adjacent to the caster mounting bracket 55 is the two-wheel caster 4 A projecting wheel 514 is provided for smooth turning, and a storage portion 515 for storing a wheel tooth meshing lock portion 54 that moves up and down and a pressing spring 543 is disposed above the wheel bearing portion 511. The fitting part 512 of the twin-wheel caster 4 including the storage part 515 and the turning support part 52 are firmly supported in a freely rotatable manner, but the turning support part 52 is firmly fixed to the caster mounting bracket 55 side.
In addition, the storage part 513 has an opening on the lower side and one side (a dust cover may be provided if necessary), which is fixed to the caster mounting bracket 55 during assembly work. The turning support washer 523 and the stopper (fixed snap ring) 524 are attached so that the turning support portion 52 to be rotated can be freely rotated on the fitting portion 512.
After inserting the swivel support part 52 into the fitting part 512, a swivel auxiliary washer 523 is inserted into the lower end of the swivel support part 52, and used for a fastener (snap ring) provided at the lower end of the swivel support part 52. A snap ring 524 is locked in the fixed circumferential groove 525 to fix the turning support portion 52 so that the turning support portion 52 does not fall out of the lock mechanism frame 51.

  Further, a base portion 541 of the wheel tooth meshing lock portion 54 is attached to the lower end portion of the knock member 531 of the knock portion 53, and this base portion 541 is shown in FIG. The lower horizontal portion 5411, the upper horizontal portion 5412, and a connecting portion 5413 that connects the lower horizontal portion 5411, the upper surface of the lower horizontal portion 5411 is the lower tip of the knock member 531 The upper horizontal portion 5412 is engaged with the upper end portion of the spring 543 that presses and presses outward so that the tooth portion 542 is fixed to the upper horizontal portion 5412. An upper spring engaging portion 544 is provided. The lower end portion of the pressing spring 543 engages with the lower spring engaging portion 545 provided on the lock mechanism frame 51 side, and the upper spring engaging portion 544 on the lower surface of the upper horizontal portion 5412 is always pressed upward. Yes.

(Swivel support part and knock part)
Next, the fitting part 512, the turning support part 52, and the knock member 531 in FIG. 18 will be described.
The fixed support cylinder member 521 of the turning support portion 52 is a metal cylinder (pipe), and its upper end is fixed to the bottom plate 554 of the metal caster mounting bracket 55 by welding or the like. Here, as shown in FIG. 16, the turning of the twin-wheel caster 4 is caused by the eccentricity of the vertical line of the ground contact point X2 of the normal twin-wheel caster 4 and the ground contact point X1 of the axial center of the knock member 531. When the bed table 1 is moved, the traveling direction of the twin-wheel casters 4 is automatically directed to the moving direction. Naturally, when the twin-wheel casters 4 are locked, the twin-wheel casters 4 do not rotate. Turning is prevented, but conversely, if the overbed table 1 is not in a locked state, it must be freely turned. Therefore, a protruding wheel 514 is interposed between the turning support portion 52 and the bottom plate 554 of the caster mounting bracket 55 so that the turning on the upper surface of the lock mechanism frame 51 is smooth.
The swivel support part 52 constitutes the swivel shaft of the caster and fits and stores a knock member 531. The knock part 53 can freely move up and down by the concentric fitting part 512 of the swivel support part 52. It is mated.

(Wheel tooth meshing lock)
As shown in FIG. 22, the base portion 541 has a U-shaped cross section of the base portion 541 (from the opposite side, an inverted U-shape) at the central portion (in FIG. 21) of the lower surface of the upper horizontal portion 5412. An upper spring engaging portion 544 that locks the upper end of the pressing spring 543 is provided, and a pair of two tooth portions 542a on the left and right so as to be fitted to the internal gears 45 of the pair of wheel portions 41 of the twin-wheel caster 4. , b are fixed, and are configured to always push upward by a pressing spring 543 that presses outward.
Therefore, as shown in FIGS. 17 and 19, the tooth portions 542a and b of the wheel tooth meshing lock portion 54 are always pressed upward by the pressing spring 543 and lifted up unless the knock member 531 is regulated. In the normal case where the overbed table 1 is installed in the vicinity of the bed, the tooth portions 542a, b are fitted to the internal gear 45 of each twin wheel caster 4 by the pressing spring 543 to prevent the rotation of the twin wheel caster 4. In this state, the overbed table 1 cannot be moved.
Note that the vertical movement of the wheel tooth meshing lock portion 54 is lowered and raised along the side wall of the guide groove 516 of the storage portion of the wheel tooth meshing lock portion 54 provided in the lock mechanism frame 51.
Further, a concentric internal gear 45 is formed on the wheel shaft 42 in the vicinity of the outer ring 44 inside the wheel portion 41 of the twin-wheel caster 4, and when the tooth portions 542 a and b rise, the tooth portions 542 are formed on the internal gear 45. Prevents the wheel 41 from rotating.

(Caster mounting bracket and slider cam)
The slider cam 56 for operating the caster mounting bracket 55 and the knock member 531 in FIGS. 20 to 23 will be described.
The operation wire 31 is pulled by the operation of raising the handle portion 21 (see FIGS. 9 and 10) of the terminal operation unit 3, and the four branch wires 33 are also pulled by the wire branch board 32 (see FIG. 14). . Furthermore, the inner wire 332 of each of the branch wires 33a, 33b, 33c, and 33d is pulled, but this has a slider-like cam mechanism attached to the caster mounting bracket 55 that converts this into movement of the knock portion 53. This is a slider cam 56.
As shown in FIG. 23, the slider cam 56 is mainly provided with a cam surface 561 whose flat shape is flat and whose lower surface is inclined. At one end in the direction in which the slider cam 56 moves, the end portion 331 of the branch wire 33 is provided. Connect the mounting fixing part 334 to the front plate 551 (see FIG. 21) of the caster mounting bracket 55, and connect the operation wire 31 and the branch wire 33 (33a, 33b, 33c, 33d: see FIGS. 11 and 14). By being pulled, it moves horizontally as a whole. As shown in FIGS. 20, 21, and 23, a guide elongated hole 564 is provided in the central portion in parallel with the horizontal upper surface 563 of the slider cam 56, and both side plates of the caster mounting bracket 55 are provided in the guide elongated hole 564. A guide shaft 565 fixed to 552 is fitted.

One end of the coil spring 567 in the contracting direction is locked to the locking portion 566 opposite to the locking portion 562, and the other end of the coil spring 567 is locked to the locking portion 568 of the back plate 553 of the caster mounting bracket 55. The coil spring 567 returns the slider cam 56 to the position shown in FIG. 21 when the operation wire 31 and the branch wire 33 are relaxed. Further, as shown in FIGS. 24 and 26, the axis of the guide shaft 565 intersects with the axis of the upper tip portion 532 of the knock member 531.
In FIG. 21, both side plates 552 of the caster mounting brackets 55 (four in total) are provided with frame body mounting portions 555, and bolts (not shown) are inserted into the bolt holes 556 at both ends of the caster frame bodies 132 a and 132 b. Etc.) and so on.

Therefore, the upper end 532 of the knock member 531 comes into contact with the cam surface 561 of the slider cam 56. However, in the unlocked state where the branch wire 33 is pulled, as shown in FIGS. Since the cam surface 561 moves from the left side to the right side, the cam surface 561 is at the lowest point 5611 which is the lowest position, and the knock member 531 is pushed downward.
On the contrary, as shown in FIGS. 18 and 19, in a state where the operation wire 31 and the branch wire 33 are relaxed, the slider cam 56 is moved to the left side as shown in FIGS. The surface 561 is at the highest point 5612 which is the highest position, and by the action of the pressing spring 543 of the tooth portion 542, the upper end portion 532 of the knock member 531 is also raised, and the tooth portion 542 is also raised, The two-wheel caster 4 is brought into a locked state by fitting with the gear 45.
This flat slider cam 56 operates so that the uppermost point 5612 moves from the lowermost point 5611 of the cam surface 561 to the upper end portion 532 of the knock member 531, but the end portion 331 of the branch wire 33 of the slider cam 56 The moving distance Z (see FIG. 18) is substantially the same as the distance Y (see FIG. 23) from the lowest point 5611 to the highest point 5612 of the cam surface 561.
Therefore, the distance from the lowest point 5611 to the highest point 5612 can be changed by the inclination angle of the cam surface 561, so that the height of the caster mounting bracket 55 is kept low and the distance (stroke) of the branch wire 33 is adjusted. Can do.

(Caster lock / unlock operation)
Since the end operating device for fixing the overbed table of the present embodiment is configured as described above, it operates generally as follows.
As shown in FIG. 1 (FIGS. 2 and 5), the handle portion 21 for unlocking the caster 4 provided on the leg portion 13 of the overbed table 1 is locked when the caster 4 is locked in a normal installation state. When the table 1 is moved, as shown in FIG. 3 (FIG. 4), the handle is moved to a position where the lock member 221 for maintaining the release fits into the lock member locking hole 2195 of the slide member 219 of the handle portion 21. The part 21 is lifted upward, and the release button 23 that is an unlock display button is projected by the downward movement of the lock member 221 for maintaining the release at this time, and the caster 4 is unlocked.
In order to return the caster 4 of the overbed table 1 to the original locked state, the lock member 221 to be released and maintained is moved upward by pushing the release button 23 which is a lock release display button downward, and the handle portion 21 is attached to the slide member 219. Since the wire is lowered by the pulling force of the wire by the pressing spring 2193 or the locking mechanism in the caster 4 or by the cooperating tension spring 2161, the original state shown in FIG. 1 is obtained. The operation of the twin wheel caster 4 in the locked / released state will be described in more detail.

[Lock state of twin wheel caster]
The locked state of the twin wheel caster 4 is as shown in FIG.
In the normal state where the overbed table 1 is arranged in the vicinity of the bed, the handle portion 21 and the release button 23 are both stored in the lower storage position, and the upper end operation of the release button 23 in the caster operation portion 2 of the overbed table 1 is performed. The part 233 is at a height substantially equal to the upper surface 255 of the operation surface of the frame 25 (see FIG. 10).
As a result, the branch wire 33 has the tooth portion 542 fitted to the caster internal gear 45 by the pressing spring 543 in the caster, the knock member 531 is also above the pressing spring 543, and the branch wire 33 is also in a relaxed state. Although the state in this case lasts for a long time, it is not necessary to keep the handle part 21 always pulling the wire 31, so that each wire is not in a tensioned state (relaxed state), and the wire stretches over time. And the maintenance of the device becomes easy.
[Unlocking condition of twin wheel caster]
The unlocked state of the twin-wheel caster is as shown in FIG.
In this case, in the state where the overbed table 1 is moved, the handle portion 21 is lifted to release the release button 23, the operation wire 31 is pulled up to be in a tension state, and the knocking member 531 is pushed downward by the branch wire 33. As a result, the tooth portion 542 is released from the internal gear 45 of the caster against the pressing spring 543 in the caster. Therefore, when the handle portion 21 is raised, the twin wheel caster is unlocked, and the overbed table 1 is movable.

Since the present embodiment is configured as described above, all casters 4 of the overbed table 1 can be locked and released by a single operation, and it is necessary to lock each caster as in the prior art. In particular, the labor of busy nurses and users can be reduced, and the caster operation unit 2 is provided on the table unit 11, so that the patient of the bed user can be placed within the reach of his / her bed. Can be operated easily by patients and nurses. Furthermore, since the caster operation part 2 is in the table part 11, the locked state and the release state of the twin-wheel caster 4 can be confirmed at a glance.
In addition, since the handle portion 21 is lifted upward and protruded in the unlocked state, unlike the normal pressing operation, the caster is not accidentally brought into the locked state and the released state, and as in the conventional case. The caster of the overbed table 1 can be fixed and released by a comfortable operation without raising the pedal or pulling it directly upward. In addition, since the release button 23 of the release maintaining mechanism 22 has to be operated, a patient, an attendant, or the like who is a user does not accidentally perform an operation of unlocking the two-wheel caster.
And, after confirming safety, the grip part 16 such as a grip or a handle that is easy for the user to grip is arranged at a predetermined position on the table part 11, so that it can be used for meals, etc. The gripper 16 can be used to help the user raise his / her upper body or stand up. Even if the user grips the grip 16 and the table is slightly shaken and the liquid overflows from the container, the entire circumference of the edge 111 of the table 11 is increased (see h in FIG. 7). Does not spill on the table.

When the release button 23 is lowered and flat, the two-wheel caster is in a locked state, and can be safely placed on the overbed table 1, and the two-wheel caster 4 is released in a dangerous state. Then, since the release button 23 protrudes and the handle portion 21 protrudes, the release state of the twin-wheel casters 4 can be confirmed at a glance even if they are separated from the overbed table 1, and the overbed table 1 can be moved. It is possible to call attention to being in an unstable state. Thus, in addition to the handle as a danger display, the release button 23 has a function of displaying the release state of the caster, thereby providing a double danger prevention display. Of course, in this state, the user is prohibited from gripping the grip 16.
Furthermore, the caster operating part 2 is provided at the edge 111 of the overbed table 1 so that the nurse becomes a middle waist when fixing the two-wheel caster 4 on the floor surface. It can be operated without the need to reach out.

In addition, since the operation transmission mechanism 3 using the operation transmission wire 30 is used, unlike the conventional link mechanism combination, the structure is simple, the production cost is low, and the number of parts is small, so maintenance is easy. Since one operation wire 31 is branched into four and used, the four casters can be accurately and simultaneously locked and released with an extremely simple configuration, and the height of the wire branch mechanism can be made small and thin. The height of the hollow portion 112 can be reduced.
In addition, a large space is required to absorb the loosening of the branch wire 33 that accompanies the raising and lowering of the table unit 11, but since this storage unit (storage unit) is provided under the table, the overall design becomes compact and the design is simplified. Therefore, a neat design is possible without restriction, and the length of the branch wire 33 to each caster can be made almost equal, and the caster can be locked and unlocked uniformly.

In addition, since the telescopic pipe 15 serving as the wire guide portion is provided in the table column portion, the branch wire 33 accompanying the lifting and lowering of the table portion 11 is not loosened near the table column portion 122 and may be exposed to the outside. Because there is no entanglement, the operation is smooth and a neat design is possible.
Further, one operation wire 31 from the caster operation unit is branched into four branch wires 33 and connected to the four wheel lock mechanisms 5, and the one operation wire 31 is moved forward and backward by the inner wire. Since the four branch wires 33 are transmitted as advancing and retracting movements by the inner wires, all casters can be simultaneously locked and released without using a complicated mechanism.
Needless to say, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired. For example, the gripping portion 16 of the present invention needs to be limited to the grip shape of the first embodiment, the handle shape which is a cylinder having large unevenness in the vertical direction of the second embodiment, the lateral long hole shape of the third embodiment, and the like. However, the shape may be any shape that can be gripped when the user gets up, for example, may be a long slot in the vertical direction where a hand can be seen on a bus or the like. It may be arranged not only on the right side of the table unit 11 but also on the right side or the center as in the example.

D ... Bed 1 ... Overbed table, 11 ... Table section,
111 .. Edge part, 112 .. Hollow part,
12,12a, 12b ... Table post, 121 ... Height adjustment lever,
122 ・ ・ Table support part, 123 ・ ・ Basic part
13 (13a, 13b) ・ ・ Legs, 131 ・ ・ Staff fixing members,
132,132a, 132b ・ ・ Caster mounting frame body,
134a, 134b ... Wire through holes,
135 .. Upper end of frame of caster operation part
14. ・ Wire storage mechanism, 141 ・ ・ Guide wall,
15 ・ ・ Expandable pipe, 15a ・ ・ Upper pipe, 15b ・ ・ Lower pipe,
151 ・ ・ Wire guide hole,
16,16a, 16b ・ ・ Grip (gripping part)
2 ・ Caster operation part,
21 ・ ・ Handle part, 211 ・ ・ Rotating shaft, 212 ・ ・ Rotating body part,
213 ・ ・ Convex part, 214 ・ ・ Locking part,
215 ... Terminal part introduction groove, 216 ... Sector gear, 217 ... Grip part,
218 ... Idle gear, 2181 ...
219 ・ ・ Slide member, 2191 ・ ・ Dental, 2192 ・ ・ Right end,
2193 ... Pressing spring, 2194 ... Left end, 2195 ... Lock member locking hole,
2196 ... side, 2197 ... shock absorber,
22 .. Release maintenance mechanism, 221 .. Lock member, 2211 .. Tip (lower end),
2212 ... Upper end, 2213 ... Pressing spring,
222 .. Rotating shaft, 223 .. Rotating member, 2231 .. One end of rotating member,
2232 ・ ・ the other end of the rotating member, 2233 ・ ・ Through hole, 2234 ・ ・ Support shaft
23 .... Release button, 231 ... Operation rod, 232 ... Lower end, 233 ... Upper operation part,
25 ・ ・ Frame, 251 ・ ・ Body storage, 252 ・ ・ Groove,
253,254 ・ ・ Regulating part, 255 ・ ・ Top part, 256 ・ ・ Locking part 3 ・ ・ Operation transmission mechanism, 30 (31, 33) ・ ・ Operation transmission wire,
31..Operation wire,
311, 316, 331, 336 ... Terminal, 312, 332 ... Inner wire,
313,333 ・ ・ Coating part (outer wire),
314, 315, 334, 335 ..Mounting fixing part,
32 ・ ・ Wire branch board, 321 ・ ・ Lid, 3211 ・ ・ Guide groove, 3212 ・ ・ Fixed convex part,
322 ・ ・ Slider, 3221, 3222 ・ ・ Fitting part, 3223 ・ ・ Mountain part,
323,324 ・ ・ Side plate, 33 (33a, 33b, 33c, 33d) ・ ・ Branch wire,
4, 4a, 4b, 4c, 4d · Twin wheel casters,
41 ・ ・ Wheel, 41A, 41B ・ ・ Wheel,
42 .. Wheel axle, 43 .. Wheel axle fixing part, 44 .. Outer ring, 45 .. Internal gear,
5. Wheel lock mechanism,
51 ··· Lock mechanism frame, 511 · · Wheel bearing portion, 512 · · Fitting portion,
513, 515 ... Storage part, 514 ... Projection ring, 516 ... Guide groove,
52 .. Rotation support part, 521 .. Fixed support cylinder member, 522 .. Mounting edge part,
523 ・ ・ Swivel auxiliary washer, 524 ・ ・ Stopper (fixed snap ring),
525 ・ ・ Fixed circumferential groove for snap ring,
53 .. Knock part, 531 ... Knock member, 532 ... Upper tip part, 533 ... Lower tip part,
54 .. Wheel tooth meshing lock part, 541 .. Base part,
5411 ... Lower horizontal part, 5412 Upper horizontal part,
5413 ・ ・ Connecting part, 542,542a, 542b ・ ・ Tooth part, 543 ・ ・ Pressing spring,
544 ... Upper spring engagement part, 545 ... Lower spring engagement part
55 ・ ・ Caster mounting bracket, 551 ・ ・ Front plate, 552 ・ ・ Side plate,
553 ... Back plate, 554 ... Bottom plate, 555 ... Frame body mounting part, 556 ... Bolt hole,
56 ・ ・ Slider cam, 561 ・ ・ Cam surface, 5611 ・ ・ Bottom point, 5612 ・ ・ Top point,
562, 566, 568 ... Locking part, 563 ... Horizontal upper surface, 564 ... Guide slot
565 ・ ・ Guide shaft, 567 ・ ・ Coil spring,

Claims (5)

An overbed table in which the table can be raised and lowered freely, and all casters can be locked and unlocked at the same time with one caster operation section on the table, and the table is fixed to the floor when the casters are locked. The caster operation unit locks and unlocks each caster using a coaxial operation transmission wire, and stores the loosened portion of the branch wire, which is the operation transmission wire when the table is raised and lowered, in the hollow or bottom surface of the table. An overbed characterized in that a gripping portion that is easy to grip by hand is fixedly provided at a predetermined position on the table to help the user to raise the upper body at a predetermined position on the table table. One operation wire that is an operation transmission wire from the caster operation section is branched into four branch wires and connected to the four wheel lock mechanisms, and the one operation wire is moved forward and backward by the inner wire. The overbed table according to claim 1, wherein the overbed table is transmitted as an advancing and retracting movement of the four branch wires by an inner wire . The overbed table according to claim 1, wherein the grip portion is a grip having a shape that can be wrapped with a palm . The overbed table according to claim 1, wherein the grip portion is a cylinder having large irregularities in the vertical direction . The overbed table according to any one of claims 1 to 4, wherein the entire circumference of the table edge of the overbed table is increased so that liquid does not spill from the table even if it spills on the table.

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