JP6004567B2 - Overbed table - Google Patents

Description

  The present invention relates to an overbed table in which a table placed on a hospital bed or the like can be moved up and down.

Conventionally, in order to have a meal in a bed of a hospital or a nursing facility, for example, Patent Document 1 has proposed an overtable fixed and locked to the upper end of a bed fence arranged on both sides of the bed with an engagement tool. In particular, when the bed is a high bed rail, the length of the engaging tool is adjusted so that the table portion is positioned at a height that is easy for the user to use.
In addition, as shown in Patent Document 2, an overbed table in which the table portion can be adjusted up and down for meals in a bed, and an overbed table that is movable by providing casters on the leg portion, for example, It has been developed as shown in Patent Document 2.

JP 2008-93382 A JP2011-139858A JP 2007-82730 A

By the way, in beds of hospitals and nursing care facilities, bed rails that can be inserted and removed are often provided on both sides of the bed to prevent falling. When this bed fence is low, a conventional overbed table that can adjust the height of the table part as disclosed in Patent Document 2, for example, is sufficient, but when the bed fence is high, the table part eats. Had the inconvenience that the position from the bed was too high to be used. In addition, the table must be firmly fixed in order to eat.
In this case, as in Patent Document 1, it was necessary to use an overtable that is fixed to a bed in which the table portion is arranged at a position lower than the uppermost portion of the bed rail, but it takes time to move the table. There was a problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an overbed table that can be moved and the height of a table part can be adjusted even when tall bed rails are provided on both sides of the bed, and the table part. In addition, an operation unit capable of collectively operating the lock / release of the caster is arranged, and an overbed table that can be fixed to a floor or the like by the user himself / herself operating the operation unit is provided.

In order to solve the above problems, a first aspect of the invention, a pair of upper and lower vertically movable table support portion is provided at both ends, KakeDo frame portion to be bridged between the pair of table support portion is provided, wherein An up / down operation lever for raising and lowering the hanging frame portion is provided at an appropriate position of the table supporting portion, and the opposite end portion of the hanging frame portion is fixed to the table supporting portion, and an inclined portion or a vertical position is provided on the left and right sides thereof. A flat portion is provided at a lower position by the inclined portion or the vertical portion in the center portion, a table portion is installed on the flat portion, and a bed fence is provided in a gap between the table support portion and the inclined portion or the vertical portion. The overbed table is characterized in that the upper portion of the table is positioned and the table portion can be positioned lower than the upper end of the bed rail.
According to a second aspect of the present invention, in the overbed table according to the first aspect, a caster is provided on a leg portion of the table support portion, and a caster operation portion that performs locking and unlocking operations of the caster on the table portion. Is provided.

According to a third aspect of the present invention, in the overbed table according to the second aspect, the lock and unlocking operation from the caster operation portion to each caster is performed by a coaxial operation transmission wire, and the operation transmission wire accompanying the raising and lowering of the table The storage of the relaxed portion of the branch wire is absorbed by the hollow portion of the table portion or the storage portion on the bottom surface.
According to a fourth aspect of the present invention, in the overbed table according to the second or third aspect, the operation portions of the casters are provided at the front and rear portions of the table, respectively, and the lock and unlock operations to the casters from the respective operation portions are coaxial. It is characterized by interposing a wire branching mechanism for operating branching wires to all casters by operating at least one of the caster operating levers.

According to the overbed table of the present invention, even when there are tall bed fences on both sides of the bed, the table portion can be placed at a position lower than the upper end of the bed fence. When it does, it can be set as the position where it is easy to eat.
In addition, after adjusting the height of the table section, the user can fix the overbed table to the floor by a single simple operation. Can be moved back and forth.

In the overbed table of the embodiment of the present invention, an external perspective view of a state in which the twin wheel casters in the installed state of the table portion are locked, Front 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, Front view of FIG. FIG. 1 is an external perspective view of the overbed table of FIG. 1 in a state in which the hanging frame portion and the table portion are lowered and the two-wheel casters of the caster operation portion are locked. 6 (a) is a top view of FIG. 1, FIG. 6 (b) is a cross-sectional top view of the wire storage mechanism in the hollow portion of the table portion, FIG. 6B is a longitudinal sectional view taken along line bb in FIG. The top view of the back of the leg side in the overbed table of the embodiment, FIG. 9 (a) is a side explanatory view of the internal mechanism of the caster operation lever in a state where the table portion in FIG. 1 is fixed and the caster is locked, and FIG. 9 (b) is a diagram in the middle of operating the caster operation lever by hand. FIG. 9 (c) is a side explanatory view, and FIG. 9 (c) is a side explanatory view of the internal mechanism of the caster operating lever for explaining the state in which the two-wheel caster is unlocked by raising the caster operating lever. The top view inside a caster operation part from the bottom of FIG. The side view of the caster lock release holding lever of FIG. 1 is an overall configuration diagram of the operation transmission mechanism of FIG. FIG. 13 (a) is an enlarged view of the end portion of the lever connecting wire, FIG. 13 (b) is an enlarged view of the end portion of FIG. 12A, FIG. 14 (a) is an enlarged view of the end portion of the branch wire of FIG. 12B, FIG. 14 (b) is an enlarged view of the end portion of the branch wire of the end portion, 17 (a) is a front view of the inside of the wire branch board 32 of FIG. 12, FIG. 12 (b) is a side sectional view of the wire branch board 32 taken along the line bb of FIG. FIG. 15C is a front view of the inside of the first wire branch board 32 in a state in which one lever connecting wire 31b is pulled from the state of FIG. 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, and FIG. 23C is a top view of the slider cam.

  The present invention is a lifting table that can be lifted up and down, such as an overbed that can be eaten in a bed, even with a bed with a tall bed fence, and lifts the table on the left and right sides of the table support part. The lever is arranged, and the caster operation part that locks / unlocks all casters of the leg part at the same time is arranged in the table part, and the table user fixes the overbed to the floor by the user himself / herself can do. Embodiments of the present invention will be described below with reference to the drawings.

(Table part and table support part)
As shown in FIG. 1 to FIG. 5, a pair of up and down table support portions 11 are arranged at both ends of the overbed table 1. The frame portion 12 is spanned, the opposite end portion 121 located at the uppermost portion of the spanning frame portion 12 is fixed to the upper end portion of the upper support column portion 111, and the central portion of the spanning frame portion 12 is inclined portion 122 ( Alternatively, a flat portion 123 is provided at a low position via a vertical portion), and the table portion 13 is installed on the flat portion 123.
The table portion 13 is longer in the front-rear direction than the conventional table width shown in, for example, Patent Document 2, but this is because the width in the left-right direction of the table portion 13 is shortened as will be described later. This is to secure a sufficient space for accommodating the loose operation transmission cable 30 in the wire storage mechanism 14 formed in the hollow portion 135 of the table portion 13.
As shown in FIGS. 1 and 2, the shape of the hanging frame portion 12 is located entirely in the upper space of the bed B, and the bed fence is formed in the gap between the table support portion 11 and the inclined portion 122 of the hanging frame portion 12. The upper part B2 of B1 is located. As a result, the table unit 13 can be lowered, and a desired position where the user can easily eat can be obtained.
Therefore, if the upper part B2 of the bed fence B1 can enter, the space may be secured as a vertical part instead of the inclined part 122.

The caster 4 is provided on the leg portion 18 of the table support portion 11, and the telescopic pipe 17 for guiding the wire is provided in the table support portion 11, near the central portion of the side of the upper end portion of the left and right upper support columns 111. The table raising / lowering operation lever 16 is arranged. When the table raising / lowering operation lever 16 is lowered by a spring or the like in the apparatus, the height of the table portion 13 is fixed. The table part 13 can be moved in the vertical direction. When the operation lever 16 is released after adjusting to an appropriate height, the table elevating operation lever 16 is automatically lowered to fix the table part 13 to a predetermined height. This table elevating mechanism has a slight improvement, but basically employs a mechanism as shown in the above-mentioned Patent Document 3, etc., and the description of this elevating mechanism is omitted.
The operation unit 2 for performing the locking and unlocking operation of the caster 4 is provided on the front surface 131 and the bottom 133 of the rear surface 132 as viewed from the user of the table unit 13.
1 and FIG. 2, which is a rear view thereof, show a state in which the operation lever 21 of the operation unit 2 is lowered (solid line in the figure), and is fixed at a predetermined position in the vertical direction of the table unit 13 of the overbed table 1. It is a figure which shows the whole which is the 4 locked state.

3 and FIG. 4, which is a rear view thereof, show the operation lever 21 of the caster operation unit 2 with the operation lever 16 for raising and lowering the table and the table unit being able to be raised and lowered (FIG. 3: solid line). FIG. 5 is a diagram showing the entire state in which the overbed table 1 is movable with the twin wheel casters 4 (4a, 4b, 4c, 4d) unlocked, and FIG. 5 shows the table 13 of the overbed table 1 being lowered. It is a figure which shows the whole which made the twin-wheel caster 4 (4a, 4b, 4c, 4d) lock state.
As shown in these drawings, the overbed table 1 is disposed on a bed B of a hospital or the like with the bed B interposed therebetween. The overbed table 1 mainly includes an upper table portion 13 and a pair that supports the upper table portion 13. Table support portion 11 and leg portions 14 corresponding thereto.
In this way, the upper surface of the table unit 13 is kept flat and horizontal, and is used for meals, etc. The table unit 13 is supported at both ends by a pair of extendable table support units 11, The pair of table support portions 11 are normally extendable to adjust the height of the table portion 13 located on the bed B, and are supported by the table elevating operation lever 16 which is also a height adjustment lever. The overall length is adjusted.
The table support portion 11 includes an upper support portion 111 of an upper quadrangular column and a base support portion 112 that fits and slides inside the upper support portion 111. The table support portion 11 includes a support frame portion 12 and a table portion 13. The height of the table portion 13 is adjusted by adjusting the degree of fitting of the base portion 112 to the upper column portion 111 by the table elevating operation lever 16.

The foundation support 112 is fixed by a support fixing part 181 provided on the leg 18. This support fixing part 181 may be appropriately designed according to the shape of the various basic support parts 112 of the overbed table 1 to be used, and can usually be applied to many overbed tables.
Further, as shown in FIGS. 1 and 3, the column fixing portion 181 protrudes outward from the caster mounting frame main body 182, and this is because the column fixing member 181 is disposed outside the bed B, but the caster mounting frame The main body 181 is arranged so as to be positioned below the bed B, and is prevented from protruding outside the bed B as much as possible so that the user does not trip.
The pair of leg portions 13 are connected by the corresponding table support portion 11, the hanging frame portion 12 and the table portion 13, and each leg portion 18 is provided with a caster attachment frame main body 182, respectively. Twin wheel casters 4a and 4b are attached in the vicinity of both ends of the frame main frame 182, and the twin wheel casters 4c and 4d are attached to the opposite leg portions 14 in the vicinity of both ends of the caster mounting frame main body 182. The twin wheel casters 4a to 4d are all in the unlocked state, and are fixed to the floor in the locked state so that the overbed table 1 does not move or fall over.

(Wire storage mechanism)
As shown in FIG. 6 (a), the upper surface of the central table portion 13 is flat, and as shown in FIG. 6 (b) of the perspective view of the inside and bottom from above, the front surface 131 of the table portion 13, and An operation unit 2 and a caster operation lever 21 for performing locking and unlocking operations of the caster 4 are disposed at appropriate positions on the bottom 133 of the rear surface 132.
The caster operation lever 21 may be at an appropriate position such as a side portion or a bottom portion around the table portion 13 that can be easily operated by a user of the bed B, or an intermediate position.
As shown in FIG. 6 (b), the table portion 13 is formed with a hollow portion 135 and provided with a wire storage mechanism 14, but a longitudinal section taken along line bb in FIGS. 6 (b) and 6 (b). As shown in FIG. 7, a hollow portion 13 surrounded by a top plate portion, a side portion, and a bottom portion is formed in a thick table portion 13.
The wire storage mechanism 14 stores a part of an operation transmission wire 30 for connecting the caster operation unit 2 and the twin wheel casters 4 (4a, 4b, 4c, 4d) and a wire branch board 32 associated therewith, and a table. As the support portion 11 expands and contracts, when the operation transmission wire 30 composed of the lever connecting wires 31a and 31b and the branch wire 33, in particular, the four branch wires 33 are tensioned and relaxed, the relaxed portion of the wire is placed on the table. Absorption is performed by the wire storage mechanism 14 of the hollow portion 135 provided inside the portion 13.
For this purpose, the width of the front and back of the table portion 13 is increased to increase the storage capacity, and as shown in FIG. 7, the hollow portion 135 having a space provided between the bottom portion 133 and the upper surface portion 137 of the table portion 13 is provided. An upper and lower partition plate 136 is provided at the center, and the hollow portion 135 is divided into two upper and lower stages so that the wires do not get tangled, and the four branch wires 33 are divided into two pieces so that tension and relaxation are smoothly transferred. I am doing so.

As will be described later, the operation transmission mechanism 3 includes four lever connecting wires 31a, 31b on the side of the pair of caster operating levers 21 and four twin wheel casters 4 (4a, 4b, 4c, 4d). It is composed of a branch wire 33, and a wire branch board 32 is interposed between the lever connecting wires 31 a and 31 b and the four branch wires 33.
6 (b) and 14, one end of one of the two lever connecting wires 31 is connected to one caster operating lever 21a (lower side of FIG. 6 (b)), and the other One end of the lever connecting wire 31b is connected to the other caster operating lever 21b (upper side of FIG. 6B), and the two lever connecting wires 31a and 31b are connected to one end of the wire branch board 32. .
As shown in FIG. 14, two fitting portions 3221 are provided corresponding to the two lever connecting wires 31 from the caster operation portion 2 on the input side of the slider 322 in the wire branch board 32. The shapes of the fitting portions 3221 are all the same, and are constituted by a semi-cylindrical semi-cylindrical portion 32212 and a through groove 32212 whose ends are released. Therefore, when one of the two lever connecting wires 31a and 31b is pulled by the wire branching board 32 of the wire branching mechanism, the entire slider 322 is pulled and the branch wire 33 (33a, 33b, 33c and 33d) are all moved together and pulled.

The branch wire 33 is a total of four, but 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. After being stored in the hollow portion 135 of the wire storage mechanism 14 of the table portion 13, it is guided to the expansion and contraction pipe 17 through a curved wire guide pipe 15 provided in the hanging frame portion 12.
The telescopic pipe 17 is composed of a hollow upper pipe 17a having a slightly larger diameter at the upper part and a hollow lower pipe 17b having a slightly smaller diameter at the lower part, and the lower pipe 17b is inserted into a hollow inner hole of the upper pipe 17a. The upper pipe 17a can be slid up and down, the upper end of the upper pipe 17a is fixed to the bottom of the hanging frame part 12, the lower end of the lower pipe 17b is fixed to the upper surface of the leg part 13, and two branch wires 33 are inserted into the hollow part. I am guiding you.
Two sets of branch wires (33a, 33b) and (33c, 33d) divide the four branch wires 33 into two, and provide an upper and lower partition plate 136 at the center of the hollow portion 135 to form two upper and lower stages, One branch wire (33a, 33b) is stored in the upper space portion 135a, and the other is stored in the branch wire (33c, 33d) in the lower space portion 135b, and is stored in another space so that the wires are not entangled. Therefore, the tension and relaxation are transferred smoothly. At this time, through holes 1361 are appropriately provided in the upper and lower partition plates 136 and the bottom portion 133 to guide the wires.
The two sets of branch wires (33a, 33b) and (33c, 33d) repeat the state of relaxation and no relaxation as the table part 13 is raised and lowered. When the table part 13 is lowered, the ring shown in FIG. When the diameters R1 and R2 are large and the relaxed part is accommodated in the hollow part 135 and the table part 13 is raised, the ring part in FIG. 6 (b) is small and is not substantially relaxed. The branch wire 33- is stored. In addition, you may arrange | position a guide wall in a suitable place of the hollow part 135 so that it may curve smoothly, when the branch wire 33 relaxes.
An upper and lower partition plate 136 is provided at the center of the hollow portion 135 so that the hollow portion 135 having a space is divided into two upper and lower stages so that the wires do not get entangled, and the four branch wires 33 are divided into two pieces to be tensed. In addition, the relaxation is smoothly transferred.

The telescopic pipe 17 forming the wire guide portion is housed inside the table support portion 11 that expands and contracts as the table portion 13 moves up and down, and is provided in parallel to the table support portion 11, and its height is telescopic. It is the same height (length) in synchronism with the table support part 11 to be performed. Of course, the telescopic pipe 17 is not limited to loosening the branch wire 33 accompanying the raising and lowering of the table at the table support portion, and it is only necessary that the operation is smooth.
The lever connecting wire 31 from the caster operating part 2 of the table part 13 is branched into four by a wire branching board 32, and further divided into two sets of branching wires (33a, 33b) and (33c, 33d), which are respectively expanded and contracted. As shown in FIG. 8, the pipe 17 is inserted into the leg 18 through the wire communication through hole 183 at the lower end of the telescopic pipe 17 and connected to the twin-wheel casters 4 a to 4 d.

By the way, by providing the caster operation part 2 in the table part 13, since the wire branch board 32 can be fixed to the hollow part 135 of the table part 13 in a free position, from the wire branch board 32 to the twin wheel casters 4a to 4d. The lengths of the branch wires 33 can be made substantially equal, and the locking and unlocking operations of the twin wheel casters can be made uniform.
Although details of the operation of the caster operation lever 21 on the table portion 13 will be described later, the wheel lock mechanisms 5 of the four twin-wheel casters 4 are connected via the operation transmission mechanism 3 using coaxial wires of an inner wire and an outer wire. To operate. This operation wire is equivalent to a brake wire for bicycles, etc., and consists of a core inner wire and an outer wire that covers and fixes both ends. By pulling up the lever 21 (FIG. 9C), the inner wire is pulled to release the lock of the wheel lock mechanism 5 of the twin-wheel caster 4, and conversely, the operation lever 21 is moved to the lifting mechanism, the spring of the caster lock mechanism, etc. (Fig. 9 (a)) and locked by the spring of the wheel lock mechanism 5.

(Caster operation part)
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 by the caster operating unit 2, and FIGS. 3 and 4 are external perspective views in which the caster operating unit 2 is in a released state. This will be described in detail.
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 FIGS. 9 (a) to 9 (c), FIG. 10, and FIG. The portion 2 mainly includes an operation lever 21, a rotating shaft 22, a wire end (ball) locking portion 23, a wire guide pulley 24, a wire covering (outer periphery) locking portion 25, a rotating stopper 26, a caster lock release holding lever 27, And a case 28.

9A, the caster operation lever 21 rotates about the rotation shaft 22, and the wire end (ball) locking portion 23 and the rotation stoper are integrally formed with the caster operation lever 21. The locking portion 211 and the lock holding locking portion 212 also rotate. Normally, the inner wire 312 of the lever connecting wire 31 (operation transmission wire 30) is always pulled by the spring force of the caster lock mechanism via the second wire branch board 32 and each branch wire 33 (FIG. 9 ( a) on the right). Accordingly, the caster operating lever 21 has an end 311 of the inner wire 312 locked to the wire end (ball) locking portion 23. As a result, the control lever 21 is turned counterclockwise and lowered (FIG. 9A), and is normally locked and fixed by the spring of the wheel lock mechanism 5.
It should be noted that the rotating stopper stopper 211 locks the rotating stopper 26 fixed to the case 28 so that the caster operation lever 21 does not rotate excessively.

When a nurse or a user (patient) wants to adjust the height of the table portion 13 of the overbed table 1 or moves the overbed table 1, FIG. 9 (c) and FIG. As shown in b), the operation is performed by raising the operation lever 21 upward.
In FIG. 9C, when the caster operation lever 21 of the caster operation unit 2 is given, the operation lever 21 is connected to the lever through the wire branch board 32 and each branch wire 33 against the force of the spring of the caster lock mechanism. The wire 31 is pulled leftward in the drawing, and the caster operation lever 21 is raised to the lever housing recess of the bottom portion 133 of the table portion. As a result, the operation lever 21 turns clockwise as shown in FIG. 10C and releases the lock against the spring of the wheel lock mechanism 5.
In this state, the overbed table 1 is movable, but the caster operation lever 21 must be lifted by hand. Therefore, when the movable state is maintained for a long time, the caster lock release holding lever 27 is pulled. Even if the lock portion is engaged with the lock holding engagement portion 212 and the hand is released, the caster operation lever 21 remains in the raised state (FIG. 9c), and when the movement is completed, the caster lock release holding lever 27 can be returned. For example, the caster operation lever 21 is in the original state (FIG. 9A), and is locked and fixed by the spring of the wheel lock mechanism 5.
However, the caster lock release holding lever 27 may be deleted in order to prevent the lock from being accidentally unlocked even in a normal state where the wheel must be locked.

(Operation transmission mechanism)
As shown in FIG. 12, the operation transmission mechanism 3 uses a coaxial so-called lock wire composed of a core inner wire and an outer wire which is coaxial and is also a covering portion. And a board 32. The operation transmission wire 30 includes a lever connecting wire 31 (31a, 31b), a connecting wire 32, and four branch wires 33 (33a, 33b, 33c, 33d).

The lever connecting wire 31 (31a, 31b) attached to the caster operating portion 2 is composed of a core inner wire 312 and an outer wire covering the core as shown in FIG. The inner wire 312 is provided with a spherical end portion 311a at the distal end of the inner wire 312, and the attachment fixing portion 314 is provided at the distal end of the covering portion 313. The other end portion 311b (see FIG. 12a) is connected to the wire branch board 32 (see FIG. 15). In this embodiment, there are two lever connecting wires 31 and their end portions 311a and 311b are connected to wire end (ball) engaging portions 23 of caster operating levers 21a and 21b located on the left and right sides of the overbed table 1. To do.
The end 311b on the opposite side of the lever connecting wire 31 (31a, 31b) is cylindrical as shown in FIG. 12 (a), and is connected to the wire branch board 32. The wire branch board 32 is further connected to the branch wire 33. Connect to.

Here, the configuration of the wire branch board 32 will be described with reference to FIG. 15. The wire branch board 32 of the wire branch mechanism includes two lever connecting wires 31a, as shown in FIGS. 15 (a) (b) (c). When one inner wire 312 is pulled out of 31b, the slider 322 engaged with the four branch wires 33 is pulled, and the branch wires 33 (33a, 33b, 33c, 33d) are collectively collected. Everything is pulled.
As shown in FIGS. 15 (a) and 15 (b), a slider 322 is housed in a movable manner in the interior of the wire branch board 32 with the lid 321 (FIG. 15 (b)) opened. An attachment fixing portion 314 of the lever connection wire 31 (31a, 31b) is attached to the side plate 323a (FIG. 15 (a)) of the wire branch board 32 on the lever connection wire 31 side, and the side plate 323b opposite to the slider 322 is attached to the side plate 323b side. Corresponding to the end portions 311b of the respective wires, the end portions 311b are fitted into the fitting portions 3221 including the semi-cylindrical half-cylindrical portions 32221 and the through grooves 32212 whose ends are released. The end portion 331 of the branch wire 33 is fitted in the fitting portion 3221 in which the end of the slider 322 is released.

FIG. 15 (c) shows a state in which only one lever connecting wire 31b (the lower side in FIG. 17 (c)) is pulled, and the end of the semi-cylindrical part 32221 of the fitting part 3221 is released and penetrated. Since the inner wire 312 is only loosely fitted in the groove 32212, the end portion 311b of the other lever connecting wire 31a (upper side of FIG. 15 (c)) is left untouched and is maintained as it is. The same operation is performed when only the reverse lever connecting wire 31a is pulled.
Further, as shown in FIG. 15B, which is a cross-sectional view taken along the line bb in FIG. 15A, the slider 322 must have the same moving distance of the end portions 311b of the two inner wires 312. Therefore, a plurality of crests 3223 parallel to the moving direction of the upper surface of the slider 322 are provided, and as shown in a side view in which the lid 321 is fitted, a guide groove 3211 for guiding the crest 3223 in the left-right direction is provided on the lid 321 The slider 322 accurately moves in parallel with 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 forward / backward moving means for moving the slider 322 in parallel with the forward / backward direction of the inner wires 312, 332, not only the both side walls inside the wire branch board 32, but 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.

Next, since the opposite side of the wire branch board 32 is connected to four branch wires 33 (33a, 33b, 33c, 33d), the configuration and function of the branch wire 32 and the wire branch board 32 will be described. To do.
The branch wire 33 (33a, 33b, 33c, 33d) is as shown in FIG. 14 and basically has the same configuration as the lever connecting wire 31, but four branch wires from the wire branch board 32 are provided. As shown in FIG. 14, which is an enlarged view of the symbol B in FIG. 12, one of the lengths 33 is composed of a core inner wire 332 and a covering portion 333 covering the core. Is provided with an end portion 331 having an engagement hole in the center, and a fixing portion 334 is provided at the tip of the covering portion 333 so that the inner wire 332 can move forward and backward with respect to the fixing portion 334. The other end is connected to the wire branch board 32.

Thus, the advance / retreat movement of the lever connecting 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 18 of the overbed table 1 can be freely set, and the combination of the link mechanisms, Unlike a grounding member for floating the entire table, the structure is simple, the manufacturing cost is low, and maintenance is easy. Furthermore, basically, one of the lever connecting wires 31 is branched into four branch wires 33 (33a, 33b, 33c, 33d), so four casters can be used simultaneously with a very simple configuration. Since the wire branching plate 32 can be formed into a thin and flat shape, and the wire branching mechanism 32 can be made thin and thin, it can be stored in the hollow portion 135 of the overbed table 1 or the table. It can also be attached to the bottom of the part 13.
In other words, either one of the lever connecting wires 31 from the caster operating unit 2 is branched into four branch wires 33 and connected to the four caster operating mechanisms which are the wheel lock mechanisms 5. The forward / backward movement of the inner wire 312 of the lever connecting wire 31 is transmitted to the forward / backward movement of the inner wire 332 of the four branch wires 33, and the wire branching mechanism is used to branch to the four branch wires 33. A board 32 is provided, and these wire branch boards are provided with a slider 322 for fixing the four end portions 331 of the branch wires 33 (33a, 33b, 33c, 33d) in parallel, and the slider 322 is moved forward of the inner wires 312,332. The movement can be accurately transmitted in parallel with the backward direction.

(Arrangement of twin wheel casters)
FIG. 8 described above is a plan view of the back surface of the leg portion 18 of the overbed table 1, and a pair of caster mounting frame main bodies 182 and a pair of twin wheel casters 4 (4a, 4b, 4c, 4d) are mounted across the bed B. In the present embodiment, the caster mounting frame main body 182 is arranged so as to be pulled into the bed B 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. 22), 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 4 (4a to 4d) arranged on the caster mounting frame main body 132 (132a, 132b) 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 in order to move the tooth portion 542 away from the internal gear 45. The knock member 531 is pulled by the branch wire 33 and resists the tensile force of the coil spring 567. The slider cam 56 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 the upper part of 20 (a).

  18 (a) and 18 (b) are diagrams in which the two-wheel caster 4 is locked in a normal state of the overbed table 1, that is, in a state where the operation lever 21 is lowered in FIG. 1 (FIG. 2). In the frame 51 of the mechanism 5, a turning support portion 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 53 that moves up and down is provided inside the turning support portion 52. Then, following the knock part 53, a wheel tooth meshing lock part 54 is connected 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 a stopper (snap ring) 524 provided at the lower end of the swivel support part 52 is used. A snap ring 524 is locked in the fixed circumferential groove 525 to fix the turning support portion 52 so that the lock mechanism frame 51 does not fall out of the turning support portion 52.

  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 has a pressure receiving portion that is pressed or released (released in FIG. 24) by 533. 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 (inverted U-shape from the opposite side) at the central portion (in FIG. 25) 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 lever connecting wire 31 is pulled by the operation of raising the operation lever 21 (see FIG. 9) of the caster operation unit 2 and the second wire branch board 32 (or the single wire branch board 32) (see FIG. 14). The four branch wires 33 are also pulled. 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. Is attached, mounting fixing part 334 is attached to front plate 551 (see FIG. 25) of caster mounting bracket 55, lever connecting wire 31 and branch wire 33 (33a, 33b, 33c, 33d: see FIGS. 11 and 14) As a result, the entire body is moved horizontally. 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. 19 by the coil spring 567 when the lever connecting wire 31 and the branch wire 33 are relaxed. Further, as shown in FIG. 21, the axis of the guide shaft 565 intersects with the axis of the upper tip 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, but in the unlocked state where the branch wire 33 is pulled, FIG. 20, FIG. 21, and FIG. As shown, 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 lever connecting wire 31 and the branch wire 33 are relaxed, the slider cam 56 is moved to the left as shown in FIGS. The cam 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 tip portion 532 of the knock member 531 is also raised, and the tooth portion 542 is also raised, so that the twin-wheel caster 4 The double wheel caster 4 is brought into a locked state by fitting with the internal 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 movement distance Z (see FIG. 22) is substantially the same as the distance Y (see FIG. 27) 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 terminal operating device for fixing the overbed table 1 of the present embodiment has the above-described configuration, it operates generally as follows.
As shown in FIG. 1 (FIG. 2), the operation lever 21 for unlocking the caster 4 provided on the leg portion 13 of the overbed table 1 (also used for lifting the table) locks the caster 4 in the normal installation state. When the overbed table 1 is moved, as shown in FIG. 3 (FIG. 4), the operation lever 21 for maintaining the release is lifted upward, and the caster 4 is unlocked.
To bring the caster 4 of the overbed table 1 into the original locked state and fix the height of the table portion 13, the operation lever 21 is released from the hand, and the spring in the table lifting mechanism 23 or the lock mechanism in the caster 4 is used. The operating lever 21 is naturally lowered by the spring of the pulling force of the wire, the table portion 13 is fixed, and the twin wheel caster 4 is locked.

[Lock state of twin wheel caster]
The locked state of the twin wheel caster 4 is as shown in FIG.
In a normal state where the overbed table 1 is disposed in the vicinity of the bed, the operation lever 21 is automatically positioned below (see FIG. 9).
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 operation lever 21 in a state where the wire 31 is always pulled, 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 operation lever 21 is raised, the lever connecting wire 31 is pulled up to be in a tensioned state, and the knock member 531 is pushed downward by the branch wire 33. As a result, the caster The tooth portion 542 is released from the internal gear 45 of the caster against the inner pressing spring 543. Therefore, when the operation lever 21 is raised, the twin wheel caster is unlocked, and the overbed table 1 can be moved.

Since the present embodiment is configured as described above, even when the bed has a tall bed fence on both sides, the table portion can be positioned lower than the upper end of the bed fence, When the user eats, the position can be easily set.
In addition, after adjusting the height of the table section, the user can fix the overbed table to the floor by a single simple operation. Can be moved back and forth.
In addition, in a lift table such as an overbed table, operation levers that can be used to lock and release casters in a batch are arranged on the side and bottom of the overbed table. The caster operation lever is not provided on the table as in the prior art, so that the table top surface can be made wide and flat so as not to interfere with meals. Therefore, it is possible to have a neat design.
In this way, all casters of the overbed table can be locked and released in a single operation, and there is no need to lock each caster as in the past, especially for busy nurses and users. Since the table portion is provided with a caster operation portion that also serves as a table lifting operation, the patient and nurse can easily finish the table lifting operation and the caster lock / release operation with a single operation.

In addition, since the operation transmission mechanism using the operation transmission wire is used for the lock / release operation of the casters, unlike the conventional link mechanism combination, the structure is simple, the production cost is low, and the number of parts is low. Since one operation wire is branched into four, the four casters can be accurately and simultaneously locked and released with a very simple configuration.
Furthermore, since the height of the wire branching mechanism can be made thin and small, the height of the hollow part can be made thin, and a large space is required to absorb the relaxation of the branching wire accompanying the lifting and lowering of the table part. Since the section (reservoir) is provided under the table, it is compact as a whole, and there is no restriction on the design, and a neat design is possible. The length of the branch wire to each caster can be almost equal, and the caster The locking and unlocking operation can be performed uniformly.
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, although the caster operation lever is on both the left and right sides or the bottom of the table, the caster operation lever may be provided at a plurality of easy-to-operate locations if it is not the top surface of the table.

B ・ ・ Bed, B1 ・ ・ Bed fence, B2 ・ ・ Bed fence upper part,
1. Overbed table,
11 ... Table support, 111 ... Upper support, 112 ... Base support,
12 ・ ・ Hanging frame part, 121 ・ ・ End part, 122 ・ ・ Inclined part,
123 .. Flat part,
13 ・ ・ Table part, 131 ・ ・ Front, 132 ・ ・ Rear,
133 .. Bottom,
135 .. Hollow part, 135a ... Upper space part, 135b ... Lower space part,
136 ・ ・ Upper and lower partition plates, 1361 ・ ・ Through holes, 137 ・ ・ Upper surface,
14. ・ Wire storage mechanism,
15. ・ Guide pipe,
16. ・ Table lifting lever
17 ・ ・ Expandable pipe, 17a ・ ・ Upper pipe, 17b ・ ・ Lower pipe,
18 ・ ・ Legs, 181 ・ ・ Stand fixing parts,
182 ・ ・ Caster mounting frame body, 183 ・ ・ Through hole,
2. ・ Caster operation part, 21,21a, 21b ・ ・ Caster operation lever,
211 .. Rotating stopper stopper,
212 .. Lock holding latch
22 ・ ・ Rotating shaft, 23 ・ Wire end (ball) locking part, 24 ・ ・ Wire guide pulley,
25 ・ ・ Wire covering (outer circumference) locking part, 26 ・ ・ Rotating stopper
27 ・ ・ Caster unlock release lever, 28 ・ ・ Case,
3. Operation transmission mechanism, 30 (31, 32, 33) Operation transmission wire
31,31a, 31b ... Lever connecting wire, 311a, 311b ... Terminal part,
312 ... Inner wire, 313 ... Cover (outer wire),
314 ・ ・ Mounting fixing part,
32 ... Wire branch board, 321 ... Lid, 3211 ... Guide groove,
3212 ・ ・ Fixed convex part, 322 ・ ・ Slider,
3221 ・ ・ Fitting part, 32211 ・ ・ Semi-cylindrical part, 32212 ・ ・ Through groove,
3223 ·· Yamabe, 323a, 323b · · Side plate 33 (33a, 33b, 33c, 33d) · · Branching wire,
331a, 331b ... Terminal end, 332 ... Inner wire,
333 ... Coating part (outer wire), 334 ... Installation fixing part,
4,4a, 4b, 4c, 4d ・ Double wheel caster,
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 engaging part, 545 ... Lower spring engaging 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 (4)

A pair of up and down table support portions are provided at both ends, and a hanging frame portion is provided between the pair of table support portions,
Up and down operation lever for moving up and down the hanging frame portion is provided at an appropriate position of the table support portion,
The spanning frame part is fixed to the table support part at the opposite end part, and an inclined part or a vertical part is provided on the left and right sides, and a flat part is provided at a low position by the inclined part or the vertical part at the center. The table portion is installed on the flat portion,
An overbed table, wherein an upper portion of the bed rail is positioned in a gap between the table support portion and the inclined portion or the vertical portion, and the table portion can be positioned lower than the upper end of the bed rail. . The overbed table according to claim 1, wherein a caster is provided on a leg portion of the table support portion, and a caster operation portion for performing locking and unlocking operations of the caster is provided on the table portion. Locking and unlocking operation on the respective casters from the caster operation unit performs the coaxial operation transmission wire, the hollow portion storing in said table of relaxation portion of the branch wire is an operation transmission wire due to the elevation of the table unit Alternatively, the overbed table according to claim 2 , wherein the overbed table is absorbed by a storage portion on a bottom surface of the table portion . The operation part of the caster is provided at the front and rear parts of the table part , respectively, and the lock and unlocking operation to each caster from each operation part is performed by a coaxial operation transmission wire, all by operating at least one of the caster operation levers The overbed table according to claim 2 or 3 , wherein a wire branching mechanism for operating a branching wire to the caster is interposed.

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