JP2011025800A - Fixing mechanism of overbed table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overbed table fixing device locking and releasing casters of an overbed table in one operation, thereby easily fixing and releasing the overbed table. <P>SOLUTION: The overbed table fixing device is provided with a terminal operating part operating to lock and release a plurality of double wheel casters of the overbed table at one location. The double wheel caster is provided with a wheel lock mechanism. A coaxial wire is connected between the wheel lock mechanism and the terminal operating part to transmit the operation in the terminal operating part to the wheel lock mechanism, thereby operating the double wheel casters between a locked and unlocked state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an overbed table disposed on a hospital bed or the like, and more particularly to a fixing mechanism that puts a twin wheel caster into a locked state or an unlocked state so as not to move when the overbed table is used. .

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 arranged. The frame of this leg portion is arranged by inserting both sides of the bed into the space and used as a table for meals or 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, 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 with a toe or the like to fix and lock the overbed table. What to do has been proposed.
Further, in the overbed table, since the legs and the legs are separated with the bed interposed therebetween, a mechanism for simultaneously locking or unlocking all casters has not been proposed.

JP 2003-135182 A

  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 a problem that it is necessary to perform a plurality of operations on both sides of the bed, which is particularly troublesome for busy nurses.

  In order to solve the above-mentioned problems, the invention of claim 1 is an overbed table fixing device in which the double bed casters of the overbed table are locked in one place in the overbed table in which the table is freely raised and lowered. And a terminal operation section for operating in the unlocked state.

According to a second aspect of the present invention, in the overbed table fixing device according to the first aspect, the end operation portion is provided at a high position of at least one leg portion of the overbed table.
According to a third aspect of the present invention, in the overbed table fixing device according to the first or second aspect, the wire is formed by branching one operation wire from the end operation section into four branch wires. It connects to the said wheel lock mechanism, The advance / retreat movement by the inner wire of the said 1 operation wire is transmitted as advance / retreat movement by the inner wire of the said 4 branch wire, It is characterized by the above-mentioned.
According to a fourth aspect of the present invention, in the overbed table fixing device according to the third aspect, of the four wires, the two wires are the leg portions opposite to the leg portions on which the end operation portion is disposed. The wire storage part corresponding to expansion / contraction of the leg part of a table part is provided in a wire path | route, and the loose part of a wire is absorbed.

According to the overbed table fixing device of the first aspect of the invention, all casters of the overbed table can be locked and released by one operation, and there is no need to lock each caster as in the prior art. In particular, the labor of busy nurses and users can be reduced, and even if one side of the overbed table is close to a wall or the like, the two-wheel caster can be locked from the other side.
According to the overbed table fixing device of the second aspect of the present invention, since the end operation portion is provided at a high position of the leg portion of the overbed table, the bed user can easily operate the nurse. Therefore, it is not necessary to reach to the floor and can be easily operated. Furthermore, since the terminal operation part is in a higher position, the locked state and the released state of the twin wheel caster can be confirmed at a glance.
According to the overbed table fixing device of the invention of claim 3, since the coaxial wire is used for the operation transmission, the position of the twin wheel caster on the back surface of the overbed table can be freely set. It is also easy and inexpensive to produce, and maintenance is easy due to the small number of parts.
Furthermore, the overbed table can be firmly put into a locked state and an unlocked state simply by replacing the twin wheel caster portion of the existing overbed table and the end operation portion.
According to the overbed table fixing device of the fourth aspect of the invention, even if the table portion of the overbed table is moved up and down to extend and contract the leg portion, the wire accumulation portion corresponding to the extension and contraction of the leg portion is provided in the wire path. Therefore, the loose part of a wire can be absorbed and the twin-wheel casters of both legs can be operated simultaneously.

In the overbed table of the embodiment of the present invention, an external perspective view in a state in which the twin wheel caster of the end operation unit is locked, In the overbed table of the embodiment of the present invention, an external perspective view of a state in which the double wheel caster of the end operation unit is unlocked, FIG. 1 is an external perspective view of the overbed table of FIG. 1 in a state where the table portion is lowered and the twin wheel caster of the end operation portion is locked; The top view of the back of the leg in the overbed table of the embodiment, The front view of the internal mechanism of the end operation part in the state where the lock of the twin-wheel caster is released, FIG. 5 is a front view of the internal mechanism of the end operation unit in a locked state in FIG. 7A is a side view of the outer frame of the operation unit and the operation unit cover, FIG. 7B is a front view thereof, 8 (a) is a side view of the operation unit cover, FIG. 8 (b) is a top view thereof, FIG. 8 (c) is a front view thereof, 9 (a) is a side view of the release maintaining mechanism, FIG. 9 (b) is a top view thereof, 10 (a) is a side view of the release button, FIG. 10 (b) is a front view thereof, FIG. 10 (c) is a bottom view thereof, 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. 13 is an enlarged exploded side view of the branch wire of B part of FIG. 14 (a) is a front view of the inside of the branch board in FIG. 11, FIG. 14 (b) is a cross-sectional view in a state where the branch board at the line bb in FIG. 14 (a) is covered, 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, 16 (a) is a front view of the wire storage mechanism, FIG. 16 (b) is a side view, FIG. 16 (c) is a cross-sectional view taken along line c-c in FIG. 16 (b), FIG. 1 is a schematic external perspective view of the twin-wheel caster of FIG. FIG. 18 (a) is a front perspective view of the double wheel caster with the knock member raised, and FIG. 18 (b) is a side perspective view of the knock member. FIG. 19 (a) is a front perspective view of the locked state in which the knock member is lowered, and FIG. 19 (b) is a side perspective view of the knock member. 18 and 19 are views of the lock mechanism frame, in which FIG. 20 (a) is a front view thereof, FIG. 20 (b) is a side view thereof, FIG. 21 (a) is a front view thereof, FIG. 21 (b) is a side view thereof, and FIG. FIG. 22 (a) is a front view, FIG. 22 (b) is a side view, FIG. 22 (c) is a top view, and FIG. Caster mounting bracket, perspective view assembled link arm, The perspective view of a wheel tooth meshing lock part, FIG. 25 (a) is a front view and FIG. 25 (b) is a side view of one wheel portion of the twin-wheel caster of FIG.

  The present invention has realized a mechanism for simultaneously locking or unlocking all casters in an overbed table in which legs are separated with a bed interposed therebetween, by using a wire cable. Here, a preferred embodiment of the overbed table fixing device of the present invention will be described with reference to the drawings.

(Table part and support part)
First, the first embodiment will be described with reference to FIG. 1 in a locked state of a twin wheel caster, FIG. 2 in a unlocked state of the two wheel caster (moving), and FIG. 3 in a locked state of the twin wheel caster by lowering the table unit 1. In addition, an overbed table 1 according to the first embodiment of the present invention is disposed on a bed of a hospital or the like with a bed D in between. The overbed table 1 mainly includes an upper table portion 11 and a pair of support columns that support the table portion 11. It is comprised from the part 12 (2a, 12b) and the leg part 13 (13a, 13b) corresponding to it.
The upper surface of the table portion 11 is kept flat and horizontal, and is used for meals and the like. The table portion 11 is supported at both ends by a pair of support columns 12. In order to adjust the height of the table portion 11 located on the bed, the table portion 11 is extendable and adjustable, 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.

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.
As shown in FIG. 1, the pair of leg portions 13 are connected by corresponding column portions 12 (12 a, 12 b) and a table portion 11, and are constituted by caster-equipped frames 132 a, 132 b, respectively. Twin wheel casters 4a and 4b are attached near both ends of the frame 132a (see FIG. 1), and twin wheel casters 4c and 4d are attached near both ends of the frame 132b of the leg portion 12b (see FIG. 1). When the table 1 is moved, all of the twin wheel casters 4a to 4d are in an unlocked state, and in the locked state, the overbed table 1 is shaped so as not to move or fall over.

As shown in FIG. 4, among the branch wires 33a, 33b, 33c, and 33d branched into four at the wire branch board 32 from the end operation portion 2 on the frame 132a side, The branch wires 33a and 33b are connected to the twin-wheel casters 4a and 4b of the frame 132a, and the branch wires 33c and 33d pass from the column portion 12a through the table portion 11 along the opposite column portion 12b to the twin-wheel casters of the frame body 132b. Connected to 4c and 4d.
Further, the leg portion 13a is provided with through holes for connecting four branch wires 33a, 33b, 33c, 33d from the end operation portion 2, and the branch wires 33a, 33b in the branch wire wire 33 are The remaining branch wires 33c and 33d are connected to the twin wheel casters 4a and 4b, and the wire communication through holes 134a (see FIG. 16C) are connected to the wire communication through holes 134a of the leg portion 132b from the back surface of the table portion 11. Guided and connected to twin-wheel casters 4c, 4d.

One frame 132a of the overbed table 1 has a flat storage frame 135 for storing the terminal operation mechanism and the operation transmission mechanism around the support column 12a, and a wire storage mechanism 35 to be described later on the opposite side. The frame 136 is provided, the terminal operation mechanism and the operation transmission mechanism are stored in the storage frame 135, and the upper end flat portion 1351 of the storage frame 135 is easily operated by the terminal operation unit 2. Is provided. The wire storage frame 136 is provided with a wire storage mechanism 35, which will be described in detail later.
The terminal operation unit 2 allows the four twin wheel casters 4 (4a to 4d) to be simultaneously locked and released, and the overbed table is moved into a fixed state and a movable state by operating the four wheel casters 4 (4a to 4d). Can be switched.
The end operation unit 2 is preferably positioned so as to be easily operated by a patient, a nurse, or the like, and is provided so as to protrude upward so that it can be operated by slightly folding the waist rather than the position on the floor. Of course, the upper part is easy to operate, and in some cases, it may be arranged further upward.

  As will be described in detail later by operating the terminal operation unit 2, the wheel lock mechanisms 5 of the four twin wheel casters 4 are connected via the operation transmission mechanism 3 using the coaxial wires of the inner wire and the outer wire. Manipulate. 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 the (lever), the inner wire is pulled to unlock the wheel lock mechanism 5 of the twin-wheel caster 4, and conversely, the handle is lowered and locked by the spring of the wheel lock mechanism 5.

(Caster end control part)
The details of the following operation structure will be described.
FIG. 1 is an external perspective view in which the four twin-wheel casters are locked in the terminal operation unit 2, and FIG. 2 is an external perspective view in which the terminal operation unit 2 is in a released state.
First, FIG. 2 in a state where the locks of the four twin-wheel casters are released will be described with reference to FIG. 5 showing the internal mechanism. The terminal operation unit 2 mainly includes a handle part 21, a release maintaining mechanism 22, and a release button. 23, an operation unit cover 24 and a frame body 25.
In FIG. 5, the handle portion 21 has a rotating body portion 212 that 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 the end portion 311 is locked to the locking portion 214 along the terminal portion introduction groove 215. The handle portion 21 (front side) is provided with a grip portion 217 into which four fingers can be inserted. As shown in FIG. The end portion 311 of the operation wire 31 is also lifted up.

When the handle portion 21 is pulled up to a predetermined position, the distal end portion 2211 (see FIG. 9) of the lock member 221 (see FIG. 5) of the release maintaining mechanism 22 is engaged with the lock member provided at an appropriate position on the outermost periphery of the handle portion 21. The lock member 221 is configured to be fitted in the stop hole 218. For this purpose, the lock member 221 is accommodated in the slide hole 254 provided in the guide wall 253 that guides the rotation side portion 216 of the frame 25 so as to be movable left and right. The rear end portion 2212 (see FIG. 9) of the member 221 is always pressed by the spring member 222 provided in the spring accommodating portion 255.
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 218, and this position is maintained by the fitting of the lock member locking hole 218. That is, the state in which the inner wire 312 is pulled is maintained, and as a result, the knock member 531 (see FIG. 18) provided in the twin-wheel caster 4 is pushed up, and the tooth mold 542 of the base 544 linked to the knock member 531 is moved. The internal gear 45 (see FIG. 19) of the caster is pulled up to release the fitting, and the lock in the normal state of FIGS. 1 and 3 is released, and this released state is maintained.

The release maintaining mechanism 22 is provided by engaging the release button 23. The release button 23 is fitted in the release button sliding hole 256 of the frame 25, as shown in FIGS. 9 (a) and 9 (b). In addition, a pair of pins 223 are provided on both outer circumferences at substantially the center in the axial direction of the lock member 221 of the release maintaining mechanism 22.
As shown in the side view of FIG. 10A, the front view of FIG. 10B, and the bottom view of FIG. 10C, the lower prism portion 231 of the release button 23 is formed into a fork portion 2311 so that the lock member 221 can slide. The bifurcated portion 2311 is provided with an oblique cam long hole 232, and a pin 223 is fitted in the cam long hole 232, and the tip 2211 of the rod-shaped lock member 221 has the rear end 2212 as a spring member. When it is always pressed by 222 and fits into the locking member locking hole 218 and moves to the left side (see FIG. 5), the lower square column part 231 of the release button 23 has a rectangular cross section, and is provided in the frame 25 that accommodates it. Further, the rotation is restricted by the release button sliding hole 256 (see FIG. 5) having the same rectangular cross section, and the upper end operation portion 233 of the release button 23 is raised.
Here, in order to bring the twin-wheel caster 4 into the unlocked state, first, as shown by a one-dot chain line in FIG. 5, the operation portion cover 24 is retracted rearward (right side in FIG. 5) on the upper end flat portion 1351, The handle portion 21 of the operation unit 2 is raised upward. In this state, the tip of the release button 23 is in a protruding state.
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, with respect to a state where the wheels of the four twin-wheel casters in FIG. 1 are locked, the internal mechanism thereof will be described with reference to FIG. Along the cam surface, the pin 223 also moves against the spring member 222 that presses (rightward direction in FIG. 6), and the distal end portion 2211 of the fitting lock member 221 moves backward to lock the lock member engagement hole of the handle portion 21. The handle portion 21 is released from 218, and is pulled downward by the end portion 311 of the operation wire 31.
This upward tensile force is generated via the link arm 56 (see FIG. 19), the branch wire 33, and the operation wire 31 by the knock member 531 being lowered by the pressing spring 541 (see FIG. 19) inside the caster. When the force of pulling downward by the four pressing springs 541 is insufficient, the tension spring 2161 indicated by a dotted line in FIGS. The other end is fixed to the bottom surface of the handle portion 21.
Then, due to the pulling force of the wire 33, the upper end surface 219 of the handle portion 21 becomes almost the same level as the surface of the upper end portion 1351, and the state shown in FIGS. 1 and 3 is obtained.

Further, when the handle portion 21 suddenly returns due to the pulling force of the spring and noise or the like is generated, the return speed may be reduced by the shock absorber 2162 indicated by a two-dot chain line in FIGS. Similarly, one end of the shock absorber 2162 is fixed to the bottom of the internal space of the frame body 25, and the other end is fixed to an appropriate position of the handle portion 21.
Here, since the upper end surface 219 of the handle portion 21 and the upper end operation portion 233 of the release button 23 are both lowered, the level is substantially the same as the surface of the upper end flat portion 1351 of the storage frame 135. The operating unit cover 24 is moved forward to cover the handle unit 21 and the release button 23 so that they cannot be operated.
The configuration and operation of the operation unit cover 24 will be described mainly with reference to FIGS.
7 (a) and 7 (b), the handle portion 21, the release maintaining mechanism 22 and the release button 23 are assembled in the frame 25, and the frame 25 is attached to the right side surface. Is completed by attaching an outer frame 26 that covers a part and an outer frame 27 that covers a part of the upper surface and the left side surface, and the operation unit cover 24 is attached thereto.
A step 261 is provided in the parallel direction on the right outer frame 26 located outside, and a step 271 is also provided in the parallel direction on the left outer frame 27 located on the inside, and the operation portion cover 24 is fitted into the step 261.

As shown in FIGS. 8A, 8B, and 8C, the operation unit cover 24 includes a right side plate 241, a left side plate 242, an upper plate 243, and a back plate 244. The fitting protrusion 2411 is provided in the parallel direction, and similarly, the fitting protrusion 2421 is provided in the parallel direction on the inner side of the lower end of the left side plate 242, and the operation portion cover 24 is made of a somewhat elastic synthetic resin. Then, both the fitting protrusions 2411 and 2421 are expanded at the head portion and are fitted to the respective steps 261 and 271.
A rectangular notch 2431 is provided at the front end in the moving direction of the upper plate 243 of the operation unit cover 24. When the operation unit cover 24 covers the handle portion 21 and the like, the notch 2431 is formed on the frame 25. It is fitted to a rectangular step 257 (left end in FIG. 7) provided at the top end of the upper surface, and further movement is restricted. Similarly, the operation unit cover 24 and a pair of back plate members 2441 and 2442 are provided on the back plate 244 of the operation unit cover 24 so as to straddle the upper end flat portion 1351 of the storage frame body 135. Restrict further movement in contact.
In addition, a stopper projection 272 is provided at a suitable position on the outer frame 27 so that the operation section cover 24 does not fall back too far, and a stopper engaging section 2422 is disposed at a suitable position near the beginning of the lower portion of the left side plate 242 of the operation section cover 24. Is provided.

(Operation transmission mechanism)
As shown in FIG. 11, the operation transmission mechanism 3 uses a lock wire from an outer wire that is coaxial with the core inner wire and is also a covering portion, and mainly includes an operation wire 31, a wire branch board 32, and four branches. It consists of wire 33.
As shown in FIG. 12 of the enlarged view of the end portion A, the operation wire 31 attached to the end operation portion 2 is composed of a core inner wire 312 and a covering portion 313 which is an outer wire covering the inner wire 312. 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.
Among the four branch wires 33 from the wire branch board 32, as shown in FIGS. 1 and 11, the branch wires 33a and 33b connected to the twin wheel casters 4a and 4b of the frame 132a are short, and the twin wheel casters of the frame 132b. The branch wires 33c and 33d to 4c and 4d are long, and as shown in FIG. 13 which is an enlarged view of the end portion B in FIG. 11, a core inner wire 332 and a covering portion 333 covering it are formed. The distal end of the wire 332 is provided with a distal end portion 331 having an engagement hole in the center, the distal end of the covering portion 333 is provided with an attachment fixing portion 334, and the inner wire 332 is connected to the attachment fixing portion 334 with respect to the end portion. The other end is connected to the wire branch board 32.

As shown in FIGS. 14A and 14B, the branch board of the wire branch mechanism connects the operation wire 31 and the four branch wires 33. FIG. 14A shows the lid 321 of the wire branch board 32. In FIG. 14B, the opened interior is shown in which the 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. In this way, when the terminal portion 316 of the operation wire 31 is pulled, it moves to the side plate 323 side (FIG. 13: right direction), but the four end portions 336 fitted to the slider 322 are also collectively side plates. Move away from 324 (FIG. 14: right direction).

As shown in the sectional view taken along the line aa in FIG. 14 (a) in FIG. 15 (a) and the sectional view taken 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 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. The four branch wires 33 and the mounting fixing part 335 are arranged in parallel in the branch board 32, but this is a storage frame that projects the branch board 32 upward from the leg 13 on the side surface of the overbed table 1. Since it is fixed in the body 135, the length of the operation wire 31 is not affected even if the support column 12 expands and contracts.
Moreover, since the coaxial wire was used for operation transmission, as shown in FIG. 2, 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 floating the entire overbed table as described in Patent Document 1, the structure is simple, the production cost is low, and maintenance is easy. Furthermore, since one operation wire 31 is branched into four, it is possible to accurately lock and unlock the four casters at the same time with a very simple configuration, and to lower the height of the wire branch mechanism. Since it can be made thin, it can be housed together with the terminal operation part 2 in the thin housing frame 135 on the side surface of the overbed table 1.
In other words, one operation wire 31 from the end operation portion 2 of the upper end flat portion 1351 at the upper end of the storage frame body 135 at the end is branched into four branch wires 33 to caster operation as four wheel lock mechanisms. Connected to the mechanism, the forward / backward movement of the inner wire 312 of one operation wire 31 is transmitted to the forward / backward movement of the inner wires 332 of the four branch wires 33. In order to branch this one operation wire 31 into four branch wires 33, a wire branch board 32 is provided as a wire branch mechanism, and a slider 322 for fixing the four terminal portions 331 in parallel on the wire branch board 32. The slider 322 is moved exactly in parallel with the forward and backward direction of the inner wires 312 and 332.

(Wire storage mechanism)
By the way, when the table portion 11 of the overbed table 1 in the state of FIG. 1 is lowered as in the state of FIG. 3, some of the two branch wires 33c and 33d in the branch wire 33 are 11 and the leg portions 13, 13a, 13b, the table portion 11, the column portions 12, 12a, 12b and the leg portions 13, 13a, 13b are largely relaxed.
For this reason, a wire storage mechanism 35 is provided between the support column portions 12, 12a, 12b and the leg portions 13, 13a, 13b to store the relaxed branch wires 33c, 33d so as not to protrude outside. The wire storage mechanism 35 is provided on a flat frame 136 as shown in FIG. 16, and the outer surface of the frame 136 is provided with a pair of flat frame portions 351a, b on both sides, and the storage length for guiding the wire 33 is provided. A hole 353 extends in the length direction of the leg portion 13, and a storage long hole 353 provided along the side portion of the column portion 12 is provided, and the inside of the flat frame portions 351 a and b stores the loosening wires 33 c and 33 d. An internal space storage unit 352 is provided.
Accordingly, in the state shown in FIG. 1, the branch wires 33c and 33d are not loosened, so that it is not necessary to store them in the state A. However, as the table portion 11 is lowered, the state becomes B, The back part of 352 is provided with a curved part 352a, and along this curved part 352a, branch wires 33c and 33d that are smoothly relaxed from the accommodation slot 353 can be accommodated, corresponding to the state of FIG. Then, the branch wires 33c and 33d to be relaxed are stored and stored.

(Arrangement of twin wheel casters)
FIG. 4 described above is a plan view of the back surface of the leg portion 13 of the overbed table 1, and a pair of twin-wheel casters 4 (4a, 4b) at both ends of the frame 132a on the side portion of the bed D, similarly on the opposite side of the bed. A pair of twin wheel casters 4 (4c, 4d) are attached to both ends of the frame 132b.
The outline of the appearance of these twin wheel casters 4 is as shown in FIG. 17, and the details of this configuration will be described later. A pair of wheels 41A, 41B are provided on both sides of a frame 51 of a wheel lock mechanism 5 which is a caster operating mechanism. Are respectively rotatably supported, and on the upper surface of the lock mechanism frame 51, a turning support portion 52 is provided 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 shaft center X. When the knock member 531 is pushed down by a pressing spring 541, the two-wheel caster 4 is locked and the wheels cannot rotate. On the contrary, when the push-down of the knock member 531 is released and the knock member 531 is pushed upward, 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. In particular, when the rotation of each twin wheel on the four twin wheel casters 4 (4a, 4b, 4c, 4d) is locked as in this embodiment, the forward / backward / left / right movement and turning are locked, and one twin wheel caster is fixed. In some cases, it is not sufficient, but the caster 4 of the overbed table 1 is almost fixed even at two places on the front, and if it is three places, it is more securely fixed. When the caster is locked, the overbed table 1 is securely fixed at a predetermined position.
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 part)
As described with reference to FIG. 17, the caster of this embodiment is a twin-wheel caster of wheels 41A and 41B having a distance of about 5 cm across the lock mechanism frame 51, and traveling is faster than a single-wheel caster during movement. Running stability. Further, when both wheels (double wheels) of the wheels 41A and 41B are locked, it becomes impossible to run and the turning of the caster is restricted. Further, as in this embodiment, two places at both ends of the leg portion 13a of the overbed table 1 are provided. If all four wheels of the two-wheel casters 4a, 4b and the two-wheel casters 4c, 4d of the leg portion 13b are fixed, it will be exceeded by fixing the wheels without fixing the turning of the casters themselves. The bed table 1 is found to be almost completely fixed and is based on this knowledge.
The wheel lock mechanism 5 will be described in more detail with reference to FIGS.
FIG. 18 is a view showing a state in which the grip portion 217 (see FIG. 2) is raised and the knock portion 53 is raised upward to release the lock, and in the free state where the lock of the twin-wheel caster 4 is released. 18 (a) is a cross-sectional view of the wheel lock mechanism 5, and FIG. 18 (b) is a cross-sectional view taken along the line aa of FIG. 18 (a).
FIG. 19 is a view in which the gripping part 217 (see FIGS. 1 and 3) is lowered, and the knock part 53 is in a state where the tooth part 542 is lowered by the spring 541 inside the caster, that is, the twin-wheel caster 4 is locked. FIG. 19A is a cross-sectional view of the wheel lock mechanism 5, and FIG. 19B is a cross-sectional view taken along the line aa of FIG. 19A.

As shown in FIGS. 18 (a) and 18 (b), a turning support 52 is pivotally supported in the frame 51 of the wheel lock mechanism 5 so that the two-wheel caster 4 can turn with respect to the caster mounting bracket 55. A knock part 53 that moves up and down is provided inside the turning support part 52, and a wheel tooth meshing lock part 54 is connected via a spring 541 following the knock part 53, and conversely, as shown in FIG. When the knock member 531 of the knock part 53 is pressed, the wheel tooth meshing lock part 54 is engaged with the internal gear 45 inside the wheel part 41 to prevent the wheels 41A and 41B from rotating. .
Here, the structure of each part will be described in more detail. First, the frame 51 is molded from plastic, and as shown in FIGS. 20 and 21, a wheel bearing part 511 is provided at the center, and FIG. On the left side of the frame 51 in (a), a cylindrical mounting cylinder hole 512 into which the turning support part 52 (knock part 53) (see FIG. 18) is inserted and a storage part 513 are arranged. Oiles bearings 525, 526, etc. are provided in the part close to the mounting bracket 55 to make the two-wheel caster 4 turn smoothly, but a protruding ring (cover part) 514 is provided to avoid adhesion of dust, etc. Under the wheel bearing portion 511, a wheel tooth meshing lock portion 54 that moves up and down and a storage portion 515 that stores a spring 541 are disposed.
Further, a lid member 516 as shown in FIGS. 21 (a) and 21 (b) is provided at the lower opening of the storage portion 513. This is an assembly operation, and the rotation support portion 52 is provided with oilless bearings 525, 526, and After inserting the swivel auxiliary washer 522 and inserting the swivel support part 52 into the mounting cylinder hole 512 of the frame body 51, the fixed circumferential groove for the stopper (snap ring) provided at the lower end of the swivel support part 52 It is also for working when the snap ring 523 is locked to fix the turning support portion to 523a.
Further, a base portion 544 of the wheel tooth meshing lock portion 54 is rotatably attached to a lower end portion of the knock member 531 of the knock portion 53 by a pair of flanged bearings 537, but a fixed edge 533, a washer 538 and a bolt 535 (FIG. 18 (a )), And a cover is attached after the bearing inner ring of the pair of flanged bearings 537 is not removed. A claw portion 516a (FIGS. 20 and 21) is provided on the upper side, and a hinge portion 516b is provided on the lower side. The hinge portion 516b is attached to the attachment groove 513b at the lower portion of the storage portion 513, and the pin 517 is inserted into the pin holes 516c and 513c of each other to constitute a lid with the pin 517 as the rotation center.
Then, after the operation of fixing the wheel tooth meshing lock portion 54 to the knock member 531 with the bolt 535 is finished, the claw portion 516a is fitted into the lower fitting hole 513a on the outer peripheral side of the storage portion 513 to cover it.

(Swivel support part and knock part)
Next, the turning support portion 52 and the knock member 531 attached to the mounting hole cylinder 512, the storage portion 513 in FIG. 20 will be described.
As shown in FIGS. 18 and 19, the swivel support portion 52 is a metal cylinder (pipe), and the upper end of the swivel support portion 52 is formed with a mounting edge portion 521 that spreads in the outer peripheral direction in advance, and a washer 522 is inserted. A bearing 525 is provided, and the mounting edge 521 is rotatably engaged with the mounting hole 551 of the caster mounting bracket 55. Then, after inserting the knock member 531 from the bottom, the rear end that finally comes out inside the storage portion 513 is fitted with the snap ring 523 for the shaft from the outside, and the frame 51 is pivotally supported with respect to the caster mounting bracket 55. Attached so as to be rotatable around the part 52.
The turning support portion 52 constitutes the turning shaft of the caster and houses the knocking portion 53. The knocking portion 53 will be described with reference to FIGS. 18 and 19. The knocking portion 53 includes the knocking member 531, the vicinity of the upper end. Link pin hole 532, fixed edge 533 near the lower end, screw portion 534, and bolt 535.
A pin 568 is fitted into the link pin hole 532 of the knock portion 53, and this pin 568 is a pin long hole 567 (see FIG. 5) constituting a cam hole of the arm 566 of the link arm 56 operated by a branch wire 33 described later. 22) is movably fitted. Further, the knock portion 53 is provided with a fixed edge 533 and a screw portion 534 at the lower end, and a wheel tooth meshing lock portion 54 is inserted into the screw portion 534 and the wheel tooth meshing lock portion 54 is secured to the fixed edge 533 with a bolt 535. Tighten firmly.

(Wheel part and wheel tooth meshing lock part)
As shown in FIGS. 18 and 19, the base portion 544 includes a lower tooth-type base portion 543 having a two-stage cross section (Z shape) of the base portion 544, and a wheel tooth meshing lock portion 54 as shown in FIG. Is provided with a tooth part 543 on both sides and a pair of three downward tooth parts 542 on the lower end surface thereof, and a spring engaging part 545 is provided at a substantially central portion of the upper surface 546 (see FIG. 24) of the tooth base 543. Is provided with a spring 541 that presses downward, and is always pushed downward.
Therefore, the tooth base 543 of the wheel tooth meshing lock part 54 is always pressed downward by the spring 541 provided on the upper surface of the tooth base 543 so that the overbed table is placed on the bed. In the normal case of being arranged in the vicinity, the tooth portions 542 provided on the lower surfaces on both sides of the tooth base 543 are fitted to the internal gear 45 of each twin wheel caster 4 by the spring 541 to rotate the twin wheel caster 4. Blocked and locked, making it impossible to move the overbed table. Note that the side wall 51a (see FIGS. 20 and 25) of the storage portion of the wheel tooth meshing lock portion 54 provided in the frame 51 constitutes a guide portion, and the wheel tooth meshing lock portion 54 moves up and down. Descent and rise along.
On the other hand, as shown in FIG. 25, one wheel portion 41 (41A, 41B) of the twin-wheel caster 4 has a wheel shaft 42 rotatably supported by a wheel bearing portion 511 of a frame 51, and the wheel portion 41 wheels. It is fixed to the shaft fixing portion 43 (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.
Further, a concentric inner gear 45 is formed on the wheel shaft in the vicinity of the outer ring inside the wheel portion 41 of the twin-wheel caster 4, and when the wheel shaft fixing portion 43 is lowered, the tooth portion 542 is engaged with the inner gear 45. The rotation of the wheel portion 41 is prevented.
The tooth heights y1, y2, and y3 of the three tooth portions 542 of the wheel tooth meshing lock portion 54 are set to the same height so that the load is not concentrated.

(Caster mounting bracket and link arm)
The caster mounting bracket 55 and the link arm 56 in FIGS. 18 and 19 will be described in more detail with reference to FIGS. 22 and 23.
The operation wire 31 is pulled by the operation of raising the handle portion 21 of the end operation unit 2, and the four branch wires 33 are also pulled by the wire branch board 32. Further, the inner wire 332 of each branch wire is also pulled, but it is the link arm 56 attached to the caster mounting bracket 55 that converts this into the movement of the knock portion 53.
As shown in FIG. 22, the link arm 56 is an L-shaped two arm that rotates about a rotation shaft 561, and a distal end portion 331 of the inner wire 332 is located near the tip of one arm 562 (see FIG. 13). The locking portion 563 is provided with a lateral groove 564 and a vertical groove 565 for locking the inner wire 332 and the end portion 331. The other arm 566 is bifurcated, and the tip of the knock member 531 is rotatably fitted between the two forks, and the pin corresponding to the link pin hole 532 at the tip of the knock member 531 is located in the vicinity of the tip of the knock member 531. A long hole 567 is provided, and the pin long hole 567 and the link pin hole 532 of the knock member 531 penetrate through the pin 568.
The link arm 56 is attached to the caster mounting bracket 55. The caster mounting bracket 55 having the caster mounting hole 551 provided in the bottom portion 552 is for fixing to the back surface of the leg portion 13 (13a, 13b) of the overbed table 1. Fixing portions 553 are provided at both ends, the rotation shaft 561 of the link arm 56 is pivotally supported by the end bearing portions 555 of the side plates 554, and the attachment fixing portion 334 (FIG. 13) of the branch wire 33 is attached to the attachment hole 556. If necessary, an adjustment plate 558 corresponding to the rotational mounting fixing portion 334 of the four twin wheel casters may be provided, and the distance from the end portion 331 may be adjusted by the bolt 557. Rather than a properly set fixed plate.

(Caster lock / unlock operation)
Since the terminal operating device for fixing the overbed table 1 of the present embodiment is configured as described above, it operates as follows.
[Locking state of twin wheel casters]
This is a normal state in which the table portion 11 of the overbed table 1 is arranged on the bed, and the handle portion 21 and the release button 23 are both positioned below, and these are covered by the operation cover 24, and the end operation portion As a result, the operation wire 31 is fitted to the internal gear 45 of the caster by the spring 541 in the caster, and the knock member is attached to the spring 541. 531 is also pushed and pulled by the branch wire 33. Although the state in this case lasts for a long time, it is not necessary to keep the handle portion 21 in a state where it is always pulled, so each wire is not in a tension state, does not stretch over time, and maintenance of the device is easy. Become.
[Unlocked condition of twin wheel caster]
In this case, in the state where the overbed table 1 is moved, the operation cover 24 is retracted, 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 branch wire 33 The knock member 531 is pulled upward, so that the teeth 542 are released from the internal gear 45 of the caster against the spring 541 in the caster. Therefore, in the state where the handle portion 21 is raised, the two-wheel caster is in an unlocked state, and can be easily moved by pressing the overbed table 1.

  Since the present embodiment has the configuration as described above, the operation of the overbed table 1 can be performed by lifting one position of the handle portion 21 on the upper surface of the end operation portion 2 provided on the leg portion 13 of the overbed table 1 once. The four twin wheel casters 4 can be locked and unlocked, the overbed table 1 can be easily fixed and released, and the handle portion 21 is lifted upward so that it protrudes. The caster of the overbed table 1 is not accidentally brought into the locked state or the released state, and there is no operation of raising the pedal or pulling it up directly as in the prior art, and the caster of the overbed table 1 can be operated with an unreasonable operation. Can be fixed and released. In addition, it is necessary to operate the release button 23 of the release maintenance mechanism 22, and by providing the operation cover 24, a patient or an attendant who is a user accidentally performs an operation to unlock the two-wheel caster. There is nothing.

In addition, when the operation cover 24 covers the operation part, the twin wheel caster is in a locked state, and can be safely placed on the overbed table 1, and the double wheel caster is released in a dangerous state. Then, since the handle portion 21 is in a protruding state, the released state of the twin-wheel caster 4 can be confirmed at a glance even if it is separated from the overbed table 1, and the overbed table 1 is in an unstable state in which it can move. , Can alert.
Further, in addition to the handle as a danger display, the release button has a function of displaying the release state of the caster, thereby providing a double danger prevention display.
Furthermore, by providing the operation unit on the upper surface of the end operation unit 2 of the overbed table 1, the nurse or the like becomes a middle waist and hands to the floor when fixing the twin wheel casters 4 on the floor surface at an upper position. Can be operated without having to stretch

Furthermore, since the operation transmission mechanism using wires is used, unlike the combination of link mechanisms, the structure is simple, the production costs are low, and the number of parts is small, so maintenance is easy and 4 operation wires are required. Since it is branched into books, the four casters can be locked and released accurately at the same time with a very simple structure, and the height of the wire branching mechanism can be made small and thin, so that the end operation part can also be made thin. it can.
Moreover, since it is an operation transmission mechanism using a wire, it can be arranged independently of the table vertical movement mechanism of the conventional overbed table 1, so that the conventional overbed table can be easily modified.

  Of course, 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, although the end operation part 2 was provided in one leg part, you may provide in both leg parts.

D ... Bed 1 ... Overbed table, 11 ... Table section,
12, 12a, 12b ... Struts, 121 ... Height adjustment lever, 122 ... Table support,
123 ・ ・ Basics
13 (13a, 13b) ・ ・ Legs, 131 ・ ・ Staff fixing members,
132a, 132b ・ ・ Frames with casters (mounting frames),
134a, 134b ... Wire through hole
135 .. Storage frame for end operation part, 1351.
136 ・ ・ Frame of wire storage mechanism
2 .. Terminal operation part,
21 ・ ・ Handle part, 211 ・ ・ Rotating shaft, 212 ・ ・ Rotating body part,
213 ・ ・ Convex part, 214 ・ ・ Locking part,
215 ・ ・ Terminal part introduction groove, 216 ・ ・ Rotating side part, 2161 ・ ・ Tension spring,
2162 ... Shock absorber,
217 ·· Holding part, 218 ·· Locking member locking hole, 219 ·· Upper end surface,
22 .. Release maintenance mechanism, 221 .. Lock member, 2211 .. Tip,
2212 ·· Rear end, 222 · · Spring member, 223 · · Pin,
23..Release button, 231 ... Lower prism, 2311 ... Two crotch,
232 ・ ・ Cam slot, 233 ・ ・ Upper operation part,
24 ・ ・ Operation part cover, 241 ・ ・ Right side plate, 2411, 2421 ・ ・ Mating protrusion,
2422 ・ ・ Stopper engaging part, 242 ・ ・ Left side plate,
243 ... Upper plate 2431 ... Notch, 244 ... Back plate, 2441, 2442 ... Back plate member,
25 ·· Frame, 251 · · Body storage, 252 · · Groove, 253 · · Guide wall,
254 ... Sliding hole, 255 ... Spring storage, 256 ... Release button sliding hole,
257 ·· Step, 26, 27 · · Outer frame, 261, 271 ·· Step, 272 · · Stopper projection,
3. Operation transmission mechanism, 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,
35 ・ ・ Wire storage mechanism, 351a, b ・ ・ Flat frame part, 352 ・ ・ Internal space storage part,
352a ... curved part, 353 ...
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, 51a .. Side wall, 511 .. Wheel bearing part, 512 .. Mounting cylinder hole,
513,515 ・ ・ Storage part, 513a ・ ・ Fitting hole, 513b ・ ・ Mounting groove, 513c ・ ・ Pin hole,
514 ... Projection ring, 516 ... Lid member, 516a ... Claw part, 516b ... Hinge part,
516c pin hole, 517 pin
52 ..Swivel support part, 521 ..Mounting edge part (crimping part), 522 ..Swivel auxiliary washer,
523 ・ ・ Stopper (fixed snap ring),
523a ・ ・ Fixed circumferential groove for snap ring,
525,526 ・ ・ Oiles bearing (bearing),
53 .. Knock part, 531 ... Knock member,
532 ··· Pin holes for links, 533 ·· Fixed edges, 535 · · Screws, 536 · · Bolts,
537 ・ ・ Flange bearing, 538 ・ ・ Washer,
54 .. Wheel tooth engagement lock part, 541 ... Spring, 542 ... Tooth part, 543 ... Tooth base
544 ・ ・ Base, 545 ・ ・ Spring engaging part, 546 ・ ・ Tooth base top surface, 547 ・ ・ Fitting hole,
55 ・ ・ Caster mounting bracket, 551 ・ ・ Mounting hole, 552 ・ ・ Bottom part, 553 ・ ・ Fixing part,
554 ... Both side plates, 555 ... End bearings, 557 ... Bolts, 558 ... Adjustment plates
56 ・ ・ Link arm, 561 ・ ・ Rotating shaft, 562 ・ ・ Arm,
563 ・ ・ Locking part, 564 ・ ・ Horizontal groove, 565 ・ ・ Vertical groove,
566 · Arm, 567 · Pin oblong hole, 568 · Pin,

Claims (5)

  The overbed table is fixed on the overbed table where the table can be lifted and lowered freely, with an end operation part that operates all twin wheel casters of the overbed table in a locked state and unlocked state in one place. apparatus.   2. The overbed table fixing device according to claim 1, wherein the end operation unit is provided at a high position of at least one leg of the overbed table.   The wire is connected to the four wheel lock mechanisms by branching one operation wire from the terminal operation section into four branch wires, and the forward and backward movement of the one operation wire by the inner wire is performed. The overbed table fixing device according to claim 1, wherein the overbed table fixing device is transmitted as an advance / retreat movement of the four branch wires by an inner wire.   Of the four wires, two wires extend to a leg portion opposite to the leg portion on which the end operation portion is disposed, and a wire accumulating portion corresponding to expansion and contraction of the leg portion of the table portion is provided in the path. The overbed table fixing device according to claim 3, wherein the overbed table fixing device is provided to absorb a slack portion of the wire.   The double wheel caster is provided with a wheel lock mechanism, and a coaxial wire is connected between the wheel lock mechanism and the end operation unit to transmit the operation of the end operation unit to the wheel lock mechanism, thereby locking the double wheel caster. The overbed table fixing device according to claim 1, wherein the state and the unlocked state are operated.

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