JP5405542B2 - 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, a hospital bed or the like has been provided with a table that can be moved up and down, such as an overbed, and the legs of the table are arranged in parallel with two frames, two at the end of each frame. The casters with lock levers are provided, and a total of four casters with lock levers are arranged and used as a table for meals or the like. By the way, the overbed table and the bedside table usually do not have a caster lock, and even if a hand is held on the table plate, it can easily move, causing an unexpected accident to the user. Therefore, conventionally, hospitals and the like have instructed a user to avoid being gripped by an overbed table or a bedside table when the user wakes up from the bed or stands up.

On the other hand, for example, as disclosed in Patent Document 1, a stopper mechanism is also proposed, but the table is fixed and locked by operating the stoppers attached to the casters on both sides of the bed with toes, respectively. Has been proposed.
In addition, in the overbed table, the pair of left and right legs and the legs are separated from each other with the bed in between, so simultaneous locking is difficult. As the mechanism for simultaneously locking or unlocking, mechanisms such as Patent Document 2 and Patent Document 3 have been proposed by the present applicants.

JP 2003-135182 A Japanese Patent Application No. 2009-172725 Japanese Patent Application No. 2009-204131 JP 2007-82730 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 an annoyance that it is necessary to perform the operation several times on both sides of the bed, and it is particularly troublesome work for busy nurses. There has been proposed a table in which four casters are simultaneously locked and unlocked, but there is a problem that the caster operation part is on the table and interferes with meals and medical procedures.
There are two types of control levers: the table lift control lever and the caster lock or release control lever, but the caster lock / release collective control lever is only one, whereas the table lift Since there are two operation levers on the left and right sides of the table, there are cases where the operation procedure is confused if the two operation locations are separated when performing two operations.

  The problem of the present invention is that in a lifting table such as an overbed table, the caster (2 or 4) can be locked / released by placing the collective operation lever on the left or right table side or bottom, and It is an object of the present invention to provide a table caster locking device which is arranged in the vicinity and concentrates the table raising / lowering operation and the caster lock / release operation in one place to facilitate these operations.

In order to solve the above-mentioned problem, the invention of claim 1 is an overbed table in which the table can be moved up and down, and a pair of caster operation levers for simultaneously locking and unlocking all casters of a leg portion. The table is provided on both the left and right sides or the bottom of the table, and the lock and unlock operation to each caster from the pair of caster operation units is performed by a coaxial operation transmission wire, and by operation of at least one of the caster operation levers An overbed table characterized by interposing a wire branching mechanism for operating branch wires to all casters .
According to a second aspect of the present invention, in the overbed table according to the first aspect, the operating lever is disposed in the vicinity of the left and right lifting table operating levers.
According to a third aspect of the present invention, in the overbed table according to the first or second aspect, the operation of locking and unlocking the casters from the caster operating portion is performed by a coaxial operation transmission wire, and the operation is accompanied with the elevation of the table. The storage of the relaxed portion of the branch wire, which is a transmission wire, is absorbed by the hollow portion of the table or the storage portion on the bottom surface.

According to the overbed table of the present invention, since the caster operation lever is not provided on the table, the table upper surface can be made wide and flat so as not to interfere with meals, etc. Since the caster operation lever for locking / releasing is provided, the operation part of the overbed table can be concentrated, and the user is less confused by the operation.
In addition, caster operation levers are provided on both the left and right sides of the overbed table, so using the caster operation levers close to the user makes it possible to lock and release the casters at once, simplifying the operation and making the operation easier. Complete in 1 time.
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, can be designed neatly without any restrictions in design, and the length of the branch wire to each caster can be almost equal. The locking and unlocking operation can be performed uniformly.

In the overbed table of the embodiment of the present invention, an external perspective view of a state in which the two-wheel caster of the caster operation unit is locked, Rear view of FIG. In the overbed table of the embodiment of the present invention, an external perspective view in a state in which the two-wheel casters of the caster operation unit are unlocked, Rear view of FIG. FIG. 1 is an external perspective view of the overbed table of FIG. 1 in a state in which the table unit is lowered and the two-wheel caster of the caster operation unit is locked. 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 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. FIG. 9 is a front view from the side of FIG. 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. 14 (a) is an enlarged view of the end portion of the lever connecting wire in the first wire branch board 34 of FIG. 13, FIG. 14 (b) is an enlarged view of the end portion of FIG. 13A, The enlarged view of the terminal part of the connection wire of FIG. 16 (a) is an enlarged view of the end portion of the branch wire of FIG. 13B, FIG. 16 (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 first wire branch board 34 in FIG. 13, and FIG. 17 (b) is a side of the first wire branch board along the line aa in FIG. FIG. 17C is a cross-sectional view, and FIG. 17C is a front view of the inside of the first wire branch board 34 in a state in which one lever connecting wire 31b is pulled from the state of FIG. Sectional drawing in the branch board of the 2nd wire branch board 35, Front view of the inside of a single wire branch board 36 by combining two wire branch boards in a wire branch board according to another embodiment. 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. 21 (a) is the front view, FIG.21 (b) is the side view. FIG. 22 (a) is a front perspective view of the state in which the knock member is raised and the tooth portion 542 is engaged with the internal gear 45, and FIG. 22 (b) is its knock. Side perspective view of the member, Sectional view taken along line (a)-(a) in FIG. FIG. 24 (a) is a front perspective view of the two-wheel caster in the unlocked state, and FIG. 24 (b) is a side perspective view of the knock member. FIG. 24A is 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. 27A is a front view, FIG. 27B is a side view, and FIG. 27C is a top view.

The present invention is a lifting table that can be moved up and down, such as an overbed, and table lifting levers are arranged on the left and right sides of the table. The caster operation lever that performs the lock / unlock operation at the same time is placed on the table lift lever on the left or right side or bottom, the caster operation section is removed from the table, the table lift control lever and caster lock / release The initial purpose is achieved by bringing the operation lever close to each other and simplifying the operation.
Here, the Example applied to the suitable overbed table of this invention is described along drawing. Of course, it goes without saying that the caster lock device of the present invention can be applied to a side bed table and other lifting tables.

(Table part and support part)
FIG. 1 and FIG. 2 which is a rear view thereof show an overbed table 1 which is a kind of a lifting table, and a table lifting operation lever 16 is arranged at the center of the left and right sides of the overbed table 1. 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 11 is fixed, and by raising the table raising / lowering operation lever 16, the table raising / lowering operation lever 16 can be moved up and down. When the operation lever is released after the adjustment, the table elevating operation lever 16 is automatically lowered to fix the table portion 11 at a predetermined height. This table elevating mechanism employs a known mechanism as shown in the above-mentioned Patent Document 4, etc., and the description of this elevating mechanism is omitted.
Further, the caster operation is performed in the vicinity (left side) of the table raising / lowering operation lever 16 (on the right side, the opposite side is not shown in FIG. 1) located at substantially the center of the left and right side portions 113 of the overbed table 1. A lever 21 is arranged. The caster operation lever 21 constitutes the caster operation unit 2, which will be described in detail.
In FIG. 1 and FIG. 2 which is a rear view thereof, the operation lever 21 is lowered (solid line in the figure), the table portion 11 of the overbed table 1 is fixed at a predetermined position in the vertical direction, and the two-wheel caster 4 is locked. It is a figure which shows the whole which is.

3 and FIG. 4, which is a rear view thereof, show the operation lever 21 of the caster operation unit 2 (FIG. 3: solid line) in a state where the table elevating operation lever 16 is used and the table unit can be moved up and down. FIG. 5 is a diagram showing the whole of the overbed table 1 in which the caster 4 (4a, 4b, 4c, 4d) is unlocked and the overbed table 1 is movable. FIG. It is a figure which shows the whole which set the caster 4 (4a, 4b, 4c, 4d) to the locked state.
As shown in these drawings, the overbed table 1 is disposed on a bed D such as a hospital with the bed D in between. The overbed table 1 mainly includes an upper table portion 11 and a pair supporting the same. The post portion 12 (12a, 12b) and the corresponding leg portion 13 (13a, 13b).
The upper surface of the table unit 11 is kept flat and horizontal, and is used for meals and the like. The table unit 11 is supported at both ends by a pair of telescopic column units 12, and the pair of column units 12. In general, in order to adjust the height of the table portion 11 located on the bed D, the table portion 11 is telescopic, and the length of the column portion 12 is adjusted by the table lifting / lowering operation lever 16 which is also a height adjusting lever. ing.
The column portion 12 is composed of an upper quadrangular column table support portion 122 and a small-diameter quadrangular column base portion 123 that fits and slides inside the support portion 122. Thus, the degree of fitting of the base portion 123 to the support portion 122, that is, the height of the table portion 11 is adjusted.
Further, the entire periphery of the edge of the table portion 11 is provided with an edge portion 111 (see h in FIG. 7) that is slightly higher than the table portion 11, and even if the table is slightly shaken and the liquid overflows from the container, the table portion Since the entire circumference of the 11 edge portions 111 is made high, even if liquid spills on the table, it does not drip from the table. However, it goes without saying that it may be perfectly flat if there is no need for these.

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

(Wire storage mechanism)
As shown in FIG. 6A, the upper surface of the table portion 11 is flat and the edge portion 111 is slightly higher, but the caster operation lever 21 does not exist.
As shown in FIG. 6 (b), table raising / lowering operation levers 16 are arranged on the left and right sides of the table part 11 at appropriate positions on the side parts 113 on both sides of the table part 11, and the side part or bottom part in the vicinity thereof or the middle thereof. A caster operation unit 2 is provided at each position, and caster operation levers 21 (21a, 21b) connected to the caster operation unit 2 are arranged toward the outer periphery.
The caster operation lever 21 may be at an appropriate position such as a side portion or a bottom portion of the table portion 11 that can be easily operated by a patient, a nurse, or the like, or an intermediate position of k.
As shown in FIG. 6 (b), the table portion 11 is formed with a hollow portion 112, and an operation transmission wire 30 for connecting the caster operation portion 2 and the twin wheel casters 4 (4a, 4b, 4c, 4d) and the associated members. The first and second wire branch boards to be housed are housed, and the wire housing mechanism 14 that houses the operation transmission wire 30 that expands and contracts is configured.

As will be described later (see FIG. 13), the operation transmission wire 30 includes two lever connection wires 311 and 312, one intermediate connection wire 32, and four twin wheel casters 4 (4 a, 4 b, 4 c, 4d), which is composed of four branch wires 33, and a first wire branch board 34 between the lever connection wires 31a and 31b and the connection wire 32, and between the connection wire 32 and the four branch wires 33. The second wire branch board 35 is interposed between the two.
In FIG. 6B, of the two lever connecting wires 31, one end of the lever connecting wire 31a is connected to one caster operating lever 21a (right side), and the other end of the other lever connecting wire 31b is connected to the other end. The two lever connecting wires 31a and 31b are connected to one end of the first wire branch board 34, which is connected to the caster operating lever 21b (left side).
When the inner wire 312 (see FIG. 14) of one of the two lever connecting wires 31a (31b) of the lever connecting wire 31 is pulled, the first wire branching plate 34 is in the first wire branching plate 34. The slider 342 (see FIG. 17) moves and pulls the inner wire 322 (see FIG. 15) at one end of the connecting wire 32 connected to the other end of the first wire branch board 34, and the inner wire of the connecting wire 32 is pulled. The other end of 322 is connected to one end of the second wire branch board 35 and the inner side of the four branch wires 33 (33a, 33b, 33c, 33d) connected to the other end of the second wire branch board 34. The wire 332 is configured to be pulled to one end (see FIG. 16).

There are a total of four branch wires 33. The branch wires 33 are 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. The wire guide holes 151 are connected to the expansion and contraction pipes 15 forming the wire guide portions housed in the table support columns 12, 12a and 12b.
The telescopic pipe 15 is composed of a hollow upper pipe 15a having a slightly larger diameter at the upper part and a hollow lower pipe 15b having a slightly smaller diameter at the lower part, and the lower pipe 15b is inserted into a hollow inner hole of the upper pipe 15a. The upper pipe 15a can be slid up and down, the upper end of the upper pipe 15a is fixed to the bottom of the table portion 11, the lower end of the lower pipe 15b is fixed to the upper surface of the leg portion 13, and two branch wires 33 are inserted and guided into the hollow portion. ing. In addition, the upper end of the upper pipe 15a is provided with a curved guide portion (not shown) so that the branch wire 33 that relaxes in the vicinity of the joint with the wire guide hole 151 of the table portion 11 can be easily put in and out. .
The two sets of branch wires (33a, 33b) and (33c, 33d) repeat the state of relaxation and no relaxation as the table part 11 is raised and lowered. When the table part 11 is lowered, the sign of FIG. When the state becomes A (thick line) and the relaxed portion is accommodated in the hollow portion 112 and the table portion 11 is raised, the state becomes like symbol B (thin line) in FIG. Store the branch wire that does not relax. In addition, the guide wall 141 is arrange | positioned in the appropriate place of the hollow part 112 so that it may curve smoothly, when the branch wire 33 relaxes.

The telescopic pipe 15 forming the wire guide portion is housed inside the table support column 12 that expands and contracts as the table unit 11 moves up and down, and is provided in parallel to the table support column 12, and its height is expanded and contracted. It is the same height (length) in synchronization with the table support column 12 to be performed. Of course, the telescopic pipe 15 is not limited in that the branch wire 33 accompanying the lifting and lowering of the table is loosened in the vicinity of the table column, and the operation may be smooth.
The lever connecting wire 31 from the caster operation part 2 of the table part 11 is eventually branched into four by the second wire branch board 35 and further into two sets of branch wires (33a, 33b) and (33c, 33d). As shown in FIG. 8, they are separated and inserted into the telescopic pipes 15 (15a, 15b) and led to the leg portions 13 (13a, 13b) from the wire communication through holes 134a, 134b at the lower ends of the telescopic pipes 15, respectively. Connected to casters 4a-d.
By the way, by providing the caster operating part 2 on the table part 11, the second wire branch board 35 can be fixed to the hollow part 112 of the table part 11 at a free position. Is arranged substantially at the center of the table portion 11, so that the lengths of the branch wires 33 from the second wire branch board 35 to the twin wheel casters 4a to 4d can be made substantially equal, and the two wheel casters can be locked and unlocked uniformly. Can do.

  Although details of the operation of the caster lever 21 on the table portion 11 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 the inner wire and the outer wire. Manipulate. 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, FIG. 11, and FIG. The caster operation unit 2 mainly includes an operation lever 21, a rotation shaft 22, a wire end (ball) locking unit 23, a wire guide pulley 24, a wire coating (outer periphery) locking unit 25, a rotating stopper 26, and a caster lock release holding. It consists of a 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 connection wire 31 (operation transmission wire 30) is always pulled by the spring force of the caster lock mechanism via the second wire branch board 35 and each branch wire 33 (FIG. 9 ( the left side in a)). Accordingly, the caster operating lever 21 has an end 311 of the inner wire 312 locked to the wire end (ball) locking portion 23. lifted, as a result, the operating lever 21 becomes the lowered and rotated in clockwise (FIG. 9 (a)) states, are usually locked by a spring of the wheel lock mechanism 5 fixed.
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 the nurse or patient wants to adjust the height of the table portion 11 of the overbed table 1 or to move the overbed table 1, FIG. 9 (c) and FIG. 9 (b) during the operation are shown. As described above, the operation lever 21 is raised upward.
9C, when the caster operation lever 21 of the caster operation unit 2 is given, the operation lever 21 is connected to the lever via the wire branch board 35 and each branch wire 33 against the spring force of the caster lock mechanism. The wire 31 is pulled rightward in the drawing, and the caster operation lever 21 is raised to the lever housing recess 17 of the table bottom 114. As a result, the operating lever 21 is in the state shown in FIG. 10 (c) which is rotated counterclockwise to unlock 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. 13, the operation transmission mechanism 3 uses a coaxial so-called lock wire that is coaxial with the inner wire of the core and an outer wire that is also a covering portion. It consists of a board (34, 35, 36). The operation transmission wire 30 is composed of a lever connecting wire 31 (31a, 31b), a connecting wire 32, and four branch wires 33 (33a, 33b, 33c, 33d). It consists of a wire branch board 34 and a second wire branch board 35. However, the branch wire may use a single wire branch board 36 as another embodiment.

The lever connecting wire 31 attached to the caster operating part 2 is composed of a core inner wire 312 and a covering part 313 which is an outer wire covering the core as shown in FIG. A spherical end portion 311 a is provided at the tip of the inner wire 312, and a mounting fixing portion 314 is provided at the tip of the covering portion 313, so that the inner wire 312 can move forward and backward with respect to the mounting fixing portion 314. The other end 311b (see FIG. 14a) is connected to the first wire branch board 34 (see FIG. 17). 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 terminal portion 311b on the opposite side of the lever connecting wire 31 (31a, 31b) is cylindrical as shown in FIG. 14 (a), and is connected to the first wire branch board 34. The first wire branch board 34 is Further, it is connected to the connecting wire 32. As shown in FIG. 15, the connecting wire 32 has basically the same configuration as the lever connecting wire 31, but both end portions are the same as the end portion 311 b of the lever connecting wire 31 and are cylindrical. Since only the difference is made, other description is omitted.

Here, the configuration of the first wire branch board 34 will be described with reference to FIG. 17. The first wire branch board 34 of the wire branch mechanism includes two levers as shown in FIGS. 17 (a) (b) (c). The structure is such that when at least one of the connecting wires 31a and 31b is pulled, the inner wire 312 is pulled by the connecting wire 32.
As shown in FIGS. 17 (a) and 17 (b), a slider 342 is accommodated in a movable manner in the inside of the wire branch board 34 with the lid 341 (FIG. 17 (a)) opened. An attachment fixing portion 314 of the lever connection wire 31 (31a, 31b) is attached to the side plate 343a on the lever connection wire 31 side of the wire branch board 34, and the end portion 311b of each wire is provided on the side plate 343b opposite to the slider 342. Corresponding to the above, the end portion 311b is fitted into the fitting portion 3421 including the semi-cylindrical half-cylindrical portion 34411 and the through-groove 34212 whose ends are released. Note that the end portion 321 of the connecting wire 32 is fitted into a fitting portion 3421 in which the end of the slider 342 is released.

FIG. 17 (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 34411 of the fitting part 3421 is released and penetrated. Since the inner wire 312 is only loosely fitted in the groove 34212, the end portion 311b of the other lever connecting wire 31a (upper side of FIG. 17 (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. 17 (b), a sectional view taken along the line aa in FIG. 17 (a), the slider 342 must have the same moving distance of the end portions 311b of the two inner wires 312. A plurality of peak portions 3423 parallel to the moving direction of the upper surface of the slider 342 are provided, and as shown in the side view in which the lid 341 is fitted, a guide groove 3411 for guiding the peak portion 3423 in the left-right direction is provided in the lid 341. The slider 342 accurately moves parallel to the wire axis. Of course, conversely, parallel peaks may be provided on the lid 341, and corresponding guide grooves may be provided on the slider. Note that a fixing projection 3412 is inserted and fixed to the inner wall of the wire branch board 34 on the fitting side surface of the lid 341.
Therefore, as a parallel advance / retreat means for moving the slider 342 in parallel with the forward / backward direction of the inner wires 312, 322, the side walls on the inner side of the first wire branch board 34 as well as this alone are not effective for parallel movement. Therefore, a plurality of parallel ridges 3423 are provided on the upper surface of the slider 342, and a guide groove 3411 for guiding the ridges 3423 in the left-right direction is also provided on the lid 341 side.

Next, the other end of the connecting wire 32 is connected to the second wire branch board 35, and the opposite side of the second wire branch board 35 is connected to the four branch wires 33 (33a, 33b, 33c, 33d). Therefore, the configuration and function of the branch wire 33 and the second wire branch board 35 will be described.
The branch wire 33 (33a, 33b, 33c, 33d) is as shown in FIG. 16 and basically has the same configuration as the lever connecting wire 31, but four branch wires from the wire branch board 35 are provided. As shown in FIG. 16, which is an enlarged view of the symbol B in FIG. 13, the length of 33 is substantially the same, and comprises 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 35.
Thus, one end portion 331a (FIG. 16 (b)) is the same as the end portion 331b of the lever connecting wire 31 and is cylindrical, and is connected to the four twin wheel casters 4 (4a, 4b, 4c, 4d). The terminal portion 311b (FIG. 16 (a)) is different only in that a fitting hole is provided in order to connect to the lock mechanism frame 51, and the other description is omitted.

Since the 2nd wire branch board 35 is also the same structure as the 1st wire branch board 34 fundamentally, description of the overlapping part is abbreviate | omitted.
An attachment fixing portion 324 is attached to the side plate 353 on the connection wire 32 side of the one connection wire 32, and the end portion 321 of the inner wire 322 of the connection wire 32 is fitted to the fitting portion 3521 of the slider 352. Similarly, the attachment fixing portion 334 of the four branch wires 33 is also attached to the side plate 353b, and one end portion 331a of the branch wire 33 (33a, 33b, 33c, 33d) is also fitted to the fitting portion 3521. ing. The fitting part 3521 of the second wire branching board 35 is also composed of a semi-cylindrical semi-cylindrical part 35211 having a released end and a through-groove 35212 so that the inner wires 322 and 332 can be easily incorporated.
With such a configuration, when the other end 321 of the connecting wire 32 is pulled, the slider 352 moves to the side plate 353a side (FIG. 18: right direction). The end portion 331a also moves away from the side plate 353b all at once (FIG. 18: right direction).

In this embodiment, in order to operate reliably and to share parts, two wire branch boards, the first wire branch board 34 and the second wire branch board 35, are provided. However, as another embodiment, FIG. As shown in FIG. 19, these two wire branch boards may be combined into a single wire branch board 36.
As shown in FIG. 19, two fitting portions 3621 are provided directly corresponding to the two lever connecting wires 31 from the caster operating portion 2 on the input side of the slider 362 in the wire branch board 36. The shape of this fitting part 3621 is the same, and is composed of a semi-cylindrical half-cylindrical part 36611 with an open end and a through groove 36212 corresponding to the same cylindrical end part of a standard interwire. Yes. Since other configurations and operations are the same as those of the wire branch board 34, the description of the overlapping parts is omitted.
Therefore, even in the wire branching plate 36 of the second embodiment of the wire branching mechanism, when one of the two lever connecting wires 31a, 31b is pulled, the branch wire 33 (33a, 33b, 33c, 33d) is pulled. ) Is all pulled together.

In this way, the forward / backward movement of the lever connecting wire 31 is transmitted to the four branch wires 33 via the wire branch boards (the first wire branch boards 34 and 35 or the single wire branch board 36). Moreover, since the coaxial wire was used for operation transmission, as shown in FIG. 8, the position of the four twin-wheel casters 4 of the leg portion 13 of the overbed table 1 can be freely set. Unlike the grounding member for lifting the entire table as in the above-mentioned Patent Document 1, the structure is simple, the production cost is low, and the maintenance is easy. 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 board (34, 35, 36) can be formed into a thin and flat shape, and the wire branching mechanism can be made thin and thin, it can be placed in the hollow portion 112 of the overbed table 1. It can be stored or attached to the bottom of the table portion 11.
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 second wire branching mechanism is used to branch to the four branch wires 33. A wire branch board 35 or a single wire branch board 36 is provided, and a slider 352 (362) for fixing the four end portions 331 of the branch wires 33 (33a, 33b, 33c, 33d) in parallel is provided on these wire branch boards. The slider 352 (362) can be accurately transmitted in parallel with the forward and backward directions of the inner wires 312, 322, and 332.

(Arrangement of twin wheel casters)
FIG. 8 described above is a plan view of the back surface of the leg portion 13 of the overbed table 1, and a pair of caster mounting frame bodies 132a and 132b and a pair of twin wheel casters 4 (4a, 4b, 4c, and 4d) across the bed D. In this embodiment, the caster mounting frame main bodies 132a and 132b are arranged so as to be drawn to the bed D side.
The outline of the appearance of these casters 4 is as shown in FIG. 20, and although the details of the structure 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. 20, one wheel portion 41 (41A, 41B) is arranged on each side of each of the four twin wheel casters 4, As shown in FIG. 21, 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. 20, the caster of this embodiment is a twin-wheel caster of wheels 41A and 41B having a predetermined interval with the lock mechanism frame 51 of the wheel lock mechanism 5 interposed therebetween. 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. 22 is a diagram 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. 22 (a) is a cross-sectional view of the wheel lock mechanism 5, and FIG. 22 (b) is a side cross-sectional view of FIG. 22 (a). FIG. 23 is a cross-sectional view taken along the line aa in FIG. 23A, 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. 24 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 24 (a).

  FIGS. 22 (a) and 22 (b) are diagrams in which the two-wheel caster 4 is locked in the normal state of the overbed table 1, that is, in the 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. 22, 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 a 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. 22 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. 20, 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 shaft 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. 26, the base portion 541 has a U-shaped cross section of the base portion 541 (from the opposite side, an inverted U-shape) at the central portion (in FIG. 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. 21 and 23, the tooth portions 542a and b of the wheel tooth meshing lock portion 54 are always pushed upward by the pressing spring 543 and lifted 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. 24 to 27 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 35 (or the single wire branch board 36) (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. 27, the slider cam 56 is mainly provided with a cam surface 561 whose flat shape is flat and whose bottom 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. 24, 25, and 27, a guide elongated hole 564 is provided in the center 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. 23 by the coil spring 567 when the lever connecting wire 31 and the branch wire 33 are relaxed. Further, as shown in FIG. 25, the axis of the guide shaft 565 intersects with the axis of the upper tip 532 of the knock member 531.
In FIG. 25, frame body mounting portions 555 are provided on both side plates 552 of the caster mounting brackets 55 (four in total), and bolts (not shown) are provided at both end portions of the caster frame bodies 132a and 132b. Etc.) and so on.

Therefore, the upper end portion 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. 24, FIG. 25, 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. 22 and 23, when 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 11, 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. Due to the spring of the pulling force of the wire, the operation lever 21 is naturally lowered and the table portion 11 is fixed and the twin wheel caster 4 is locked.

[Lock state of twin wheel caster]
The twin-wheel caster 4 is locked 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, in an elevating table such as an overbed table, an operation lever that can collectively lock / release casters is provided on the side portion of the overbed table. Since it is placed at the bottom, it can be placed in the vicinity of the table elevating lever, and the caster operating lever is not provided on the table as in the past, so the table top is wide and flat so as not to disturb food Therefore, it is possible to achieve a clean design without interfering with medical practice.
Further, since the caster operation lever for locking / releasing the casters is provided in the vicinity of the table elevating operation lever, the operation portion of the overbed table can be concentrated, and the user is less confused by the operation. In addition, caster operation levers are provided on both the left and right sides of the overbed table, so using the caster operation levers close to the user makes it possible to lock and release the casters at once, simplifying the operation and making the operation easier. Complete in 1 time.
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.
Furthermore, even if the table is slightly shaken and the liquid overflows from the container and spills on the table, the entire circumference of the edge 111 of the table 11 is increased (see h in FIG. 7), so that the liquid drips from the table. There is no.
In addition, since the telescopic pipe 15 serving as the wire guide portion is provided in the table column portion, the branch wire 33 accompanying the raising and lowering of the table portion 11 moves smoothly without being loosened in the vicinity of the table column portion 12. Because it is not exposed to the surface, the operation is smooth without tangling, and a neat design is possible.
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.

D. Bed,
1 .... overbed table, 11 .... table section
111 .. Edge, 112 .. Hollow part, 113 .. Side part, 114 .. Bottom part,
12,12a, 12b ・ ・ Table support,
122 ・ ・ Table support part, 123 ・ ・ Basic part,
13 (13a, 13b) ・ ・ Legs, 131 ・ ・ Staff fixing members,
132,132a, 132b ・ ・ Caster mounting frame body,
134a, 134b ... Wire through hole,
14. ・ Wire storage mechanism, 141 ・ ・ Guide wall,
15 ・ ・ Expandable pipe, 15a ・ ・ Upper pipe, 15b ・ ・ Lower pipe,
151 ・ ・ Wire guide hole,
16. ・ Table lifting operation lever,
17. ・ Lever storage recess,
2 ・ Caster operation part,
21, 21a, 21b ... Caster control 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 ・ ・ Connection wire, 321 ・ ・ Terminal part, 322 ・ ・ Inner wire,
323 ・ ・ Coating part (outer wire), 324 ・ ・ Mounting fixing part,
33 (33a, 33b, 33c, 33d) ・ ・ Branch wire,
331a, 331b ... Terminal end, 332 ... Inner wire,
333 ... Coating part (outer wire), 334 ... Installation fixing part,
34 ・ ・ First wire branching board, 341 ・ ・ Lid, 3411 ・ ・ Guide groove,
3412 ・ ・ Fixed convex part, 342 ・ ・ Slider,
3421 ・ ・ Fitting part, 34411 ・ ・ Semi-cylindrical part, 34212 ・ ・ Through groove,
3423 ·· Mountains, 343a, 343b · · Side plates,
35 ・ ・ Second wire divider, 352 ・ ・ Slider, 3521 ・ ・ Fitting part,
35211 ... Semi-cylindrical part, 35212 ... Through groove, 3523 ...
353a, 353b ... Side plate,
36 ··· Single wire divider, 362 · · Slider, 3621 · · Fitting part,
36211 ・ ・ Semi-cylindrical part, 36212 ・ ・ Through groove, 3623 ・ ・ Mountain part,
363a, 363b ... Side plate,
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 engagement part, 545 ... Lower spring engagement part
55 ・ ・ Caster mounting bracket, 551 ・ ・ Front plate, 552 ・ ・ Side plate,
553 ... Back plate, 554 ... Bottom plate, 555 ... Frame body mounting part, 556 ... Bolt hole,
56 ・ ・ Slider cam, 561 ・ ・ Cam surface, 5611 ・ ・ Bottom point, 5612 ・ ・ Top point,
562, 566, 568 ... Locking part, 563 ... Horizontal upper surface, 564 ... Guide slot
565 ・ ・ Guide shaft, 567 ・ ・ Coil spring,

Claims (3)

In an overbed table in which the table can be moved up and down, a pair of caster operating levers for simultaneously locking and unlocking all casters of the legs are provided on both the left and right sides or the bottom of the table . The caster operation unit locks and unlocks each caster using a coaxial operation transmission wire, and a wire branch mechanism that operates branch wires to all casters by operating at least one of the caster operation levers. Overbed table characterized by intervening .   The overbed table according to claim 1, wherein the operation lever is disposed in the vicinity of the left and right lifting table operation levers.   Locking and unlocking operation to each caster from the caster operation part is performed by a coaxial operation transmission wire, and storing of the loosened part of the branch wire which is an operation transmission wire accompanying raising and lowering of the table is stored in the hollow part of the table or the storage part on the bottom surface The overbed table according to claim 1, wherein the overbed table is absorbed by the above.

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