JP5868377B2 - Bedside table - Google Patents

Description

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

  Conventionally, a bed that can be moved up and down, such as a bedside table, is arranged on a hospital bed or the like, and the legs of the table are arranged in parallel with two frames, and one frame is a floor under the bed. The two casters with lock levers are provided at the end of each frame, and a total of four casters with lock levers are arranged to provide a table for meals and medical activities. It is used as By the way, usually, the bedside table has no caster lock because it is difficult to lock the caster under the bed, and it can easily move even with a hand on the table board, causing an unexpected accident to the user. was there. Therefore, conventionally, hospitals and the like have instructed a user to avoid being gripped by a bedside table or the like when getting up from the bed or standing up.

Therefore, as disclosed in Patent Document 1, a grounding member that can move up and down is provided on the caster portion of the bedside table, and when locked, the grounding member protrudes downward by stepping on the operation pedal, and the caster floats from the floor. There are proposals to fix and lock the bedside table.
Further, as disclosed in Patent Document 2, the present applicant provides an operation device on the leg portion that can lock and release the caster of the bedside table by a single operation, so that the bedside table can be easily Has proposed a bedside table fixing device that can fix and release.
Incidentally, in the overbed table, a device provided with operation levers for raising and lowering the table in the longitudinal direction of the table is known as Patent Document 3, but the caster of the bedside table is locked and released in one operation. A bedside table with two or more control levers that can be used is not yet known.

JP 2002-136370 A JP 2011-182896 A JP 7-265134 A

By the way, the bedside table locking mechanism disclosed in Patent Document 1 is basically painful for nurses and bed users to operate at a location close to the floor. And there is a problem that it is necessary to perform multiple operations on both sides of the bed, especially for busy nurses. Although a table has been proposed in which four casters are simultaneously locked and unlocked by the operation of the unit, the caster operation unit is on the table, which has been an obstacle to meals and medical procedures.
Also, even if it can be operated with one operation part, if there is only one place, if there is an operation part on the opposite side of the table support part, the table support part becomes obstructive and the operation is difficult. However, there is a problem that it is difficult to operate if there is an operation part on the opposite side in the longitudinal direction.

The problem of the present invention is that, in a lifting table such as a bedside table, as in Patent Document 2, there is an operation part on the opposite side of the table support part, or on the opposite side in the longitudinal direction of the elongated table. The present invention provides a side table that copes with the case where there is a part and makes the operation easy even in such a case.
In addition, the lock / release of the four casters is placed on the side or bottom of the table so that the upper surface of the table is flat so that it does not interfere with meals and medical procedures. The table side table is provided so that the table elevating operation and the caster lock / release operation are concentrated in one place so that these operations can be easily performed.

In order to solve the above problems, the invention of claim 1 is a bedside table in which the table can be moved up and down, and is provided with caster operation portions having caster operation levers at two or more locations on the side or bottom of the table, In a bedside table that simultaneously locks and unlocks all or a plurality of casters on the bedside table at the same time by operating at least one caster operation lever , Locking and unlocking operations are performed with a coaxial operation transmission wire, and the storage of the loosened portion of the operation transmission wire (branch wire) that accompanies the lifting and lowering of the table is absorbed by the hollow part in the table part or the storage part at the bottom of the table part. Of the two or more caster operation levers, do not operate. The bedside table is characterized in that the caster operation lever is not moved.
The invention of claim 2 is the bedside table according to claim 1, wherein the lock and unlock operation from the caster operation part to each caster is connected and operated by a coaxial operation transmission wire and a wire branch board, When one of the operation transmission wires from the caster operation lever is pulled by the wire branching board, all or less than a plurality of casters are simultaneously locked and the operation transmission wires of other caster operation levers are locked. It is characterized by not moving.
According to a third aspect of the present invention, in the bedside table according to the second aspect, when the end portion of the operation transmission wire from the caster operation lever is pulled, the wire branch board is fitted into the fitting portion. The caster operating lever that moves and is not operated when the wire branching board is moved by the end of another operation transmission wire is prevented from moving.
According to a fourth aspect of the present invention, in the bedside table according to the first, second, or third aspect, the caster operation lever is maintained in a lowered state in a normal case, and the four casters are locked together. In the case of movement, the caster operation lever is raised upward by the user so that all or a plurality of casters below it are unlocked collectively.

According to the invention of the bedside table according to claims 1 to 3, since the caster operation lever that simultaneously locks and unlocks a plurality of casters is provided in at least two places, the caster operation lever closer to the user is provided. Since it is sufficient to operate, the operation becomes simple and the operation is completed at once.
Further, since the caster operation lever is provided on the side or bottom of the table, the caster operation lever is not provided on the table, so that the upper surface of the table can be made wide and flat so as not to disturb food.
In this way, at least a plurality of casters of the bedside table can be locked and released in a single operation, and there is no need to lock each caster as in the prior art, especially for busy nurses and users. The work can be reduced, and the table part has a caster operation part that is also used to lift and lower the table, so patients and nurses can easily finish the table lift and caster lock / release operations in one operation. .
Furthermore, since the caster operation lever that is not operated does not move, it is possible to prevent an unexpected accident such as being caught by clothes or articles of people nearby.

According to the invention of the bedside table of claim 4, the caster operating lever is maintained in a state where it is lowered downward in a normal case, and the four casters are collectively locked, and when moving, the user can All casters are unlocked at once by raising the caster operation lever upward, so there is no accident when a user or patient accidentally grabbed or leaned on the bedside table, causing an unexpected accident Can be prevented.
According to the invention of the bedside table of claim 5, since the operation transmission mechanism using the operation transmission wire is used for the lock / release operation of the caster, unlike the conventional link mechanism combination, the structure is simple and the production cost is reduced. Because it is inexpensive and has a small number of parts, it is easy to maintain, and one operation wire is branched into four, so the four casters can be locked and released accurately at the same time with a very simple configuration. Can be in a state.
Furthermore, since the height of the wire branching mechanism can be made thin and small, the height of the hollow part can also be made thin, and conventionally, a large space was required to absorb the relaxation of the branching wire accompanying the lifting and lowering of the table part. Since this storage part (storage part) is provided under the table, it is compact as a whole, and there is no restriction in terms of design, and a clean design is possible, and the length of the branch wire to each caster can be designed freely The caster can be locked and unlocked evenly.

In the bedside table of Example 1 of the present invention, an external perspective view in a state in which the two-wheel caster of the caster operation unit is locked, Rear view of FIG. In the bedside table of the embodiment of the present invention, an external perspective view of the state in which the double wheel caster of the caster operation unit is unlocked, Rear view of FIG. FIG. 1 is a perspective view of the bedside table of FIG. 1 in a state where the table portion is lowered and the two-wheel caster of the caster operation portion 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 bedside table of the embodiment, FIG. 9A is a side view of the internal mechanism of the caster operation lever in which the table portion in FIG. 1 is fixed and the caster is locked, and FIG. 9B is a side view in the middle of operating the caster operation lever by hand. FIG. 9 (c) is a side explanatory view of the internal mechanism of the caster operating lever for explaining the state in which the caster operating lever is lifted to unlock the double wheel caster, FIG. 9 is a front view from the side of FIG. 11 (a) is a plan view of the inside of the caster operation section from the bottom of FIG. 9, FIG. 11 (b) is a side view of the caster lock release holding lever of FIG. 11 (a), The expansion perspective view of the caster operation 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, FIG. 27C is a top view, and FIG. It is an external appearance perspective view from the slightly lower side of the bedside table of Example 2 of this invention.

The present invention is a lifting table that can be moved up and down, such as a bedside table, and a table lifting lever is arranged on the side of the table. Similarly to the table lifting lever, a plurality of casters on the legs are provided. If the caster operation lever that performs the lock / unlock operation at the same time is placed at the appropriate position on the side or bottom, and the caster operation lever provided at a closer location is operated, the user can move to one caster operation lever. It can be easily operated without moving.
Here, the Example applied to the suitable bedside 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 an overbed table or other lifting table.

(Table part and support part)
FIG. 1 and FIG. 2 which is the rear view thereof show a bedside table 1 which is a kind of a lifting table, and a table lifting operation lever 16 is arranged at the center of the side of the bedside table 1. 16 is lowered by a spring or the like in the apparatus, the height of the table portion 11 is fixed, and by moving up and down the table lift operation lever 16, the table portion 11 can be moved up and down and adjusted to an appropriate height. When the operating lever is released, the table raising / lowering operating lever 16 is automatically lowered to fix the table portion 11 at a predetermined height. This table elevating mechanism employs a known mechanism, and the description of this elevating mechanism is omitted.
In addition, a pair of caster operation levers 21a and 21b is disposed on the left and right sides of the table support portion 122 in the vicinity of the table lifting / lowering operation lever 16 at the center of the side portion 113 of the bedside table 1. The caster operation levers 21a and 21b constitute the caster operation unit 2, which will be described in detail.
In FIG. 1 and FIG. 2 which is the rear view thereof, the caster operation levers 21a and 21b are lowered (solid line in the figure), and fixed to a predetermined position in the vertical direction of the table portion 11 of the bedside table 1, It is a figure which shows the whole which is a locked state.

3 and FIG. 4, which is a rear view thereof, show the caster operation levers 21a and 21b of the pair of caster operation units 2 in a state where the table elevating operation lever 16 is raised and the table unit can be raised and lowered. (FIG. 3: solid line), FIG. 5 is a diagram showing the entire bedside table 1 in which the twin wheel casters 4 (4 a, 4 b, 4 c, 4 d) are unlocked and the bedside table 1 is movable. It is a figure which shows the whole which lowered | hung the table part 11, and made the twin-wheel caster 4 (4a, 4b, 4c, 4d) lock state.
As shown in these drawings, the bedside table 1 is disposed on the side (side) of a bed D such as a hospital, and the bedside table 1 mainly includes an upper table portion 11 and a support column portion 12 that supports the table portion 11. It is comprised from the leg part 13 corresponding to it.
The upper surface of the table portion 11 is kept flat and horizontal, and is used for meals and the like. The table portion 11 is supported by an extendable and cantilever-supported support column 12, and the support column 12 is Usually, in order to adjust the height of the table portion 11 located on the bed D, the length of the column portion 12 is adjusted by a table elevating operation lever 16 which is also extendable and is also a height adjusting lever. .
Further, the leg portion 13 has two caster mounting frame bodies 132 (132a, 132b) arranged in parallel, and one caster mounting frame body 132b extends toward the opposite side along the floor under the bed D, respectively. Two casters with lock levers are provided at the ends of the caster mounting frame main bodies 132a and 132b.

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 bedside table 1 to be used, and can usually be applied to many bedside tables.

Further, as shown in FIG. 1, the column fixing member 131 protrudes outward from the caster mounting frame main body 132a. Although the column fixing member 131 is disposed outside the bed D, the caster mounting frame main body 132a It arrange | positions so that it may be located in the lower side of the bed D, and it prevents it from protruding outside the bed D as much as possible so that a user may not trip.
The leg portion 13 is connected to the column portion 12 corresponding to the leg portion 13 by the table portion 11, and each leg portion 13 is composed of an opposite parallel caster mounting frame main body 132 a, 132 b and a connecting frame body 133 that connects the legs. Two-wheel casters 4a and 4b are attached in the vicinity of both ends of the caster mounting frame main body 132a on the support column 12 side of the portion 13 (see FIG. 1). Twin wheel casters 4c and 4d are also mounted near both ends, and when the bedside table 1 is moved, all four of the twin wheel casters 4a to 4d are unlocked, and in the locked state, the beds are fixed at the positions. The side table 1 has a shape that does not move or fall. However, the bedside table 1 may be fixed to the floor even if not all twin wheel casters. For example, if two twin wheel casters are locked, the bedside table 1 is fixed to the floor. What is necessary is just to fix a caster to a floor, conversely, if it is four or more five casters, you may lock all these.

(Wire storage mechanism)
As shown in FIG. 6 (a), the upper surface of the table portion 11 is flat and the edge portion 111 is slightly higher, but the caster operation lever is not present and is flat.
As shown in FIG. 6 (b), the table elevating operation lever 16 is disposed at a suitable position on the left side 113 of the table unit 11, and the table support unit 122 is sandwiched between the elevating table operation lever 16 and left and right. A pair of caster operating levers 21a, 21b is provided at the side or bottom of the table unit 11 or at an intermediate position thereof, and the caster operating levers 21a, 21b connected to the caster operating unit 2 are directed toward the outer periphery. Are arranged.
The caster operation levers 21a and 21b are preferably located at appropriate positions outside the periphery of the table portion 11 that can be easily operated by patients, nurses, and the like. In the bedside table 1 of the present embodiment, when the table portion 11 is arranged so that the longitudinal direction of the table portion 11 crosses the bed D, from the viewpoint of the user or patient sleeping on the bed, On the opposite side, the caster operation levers 21a, 21b are different from the conventional one in that one of the caster operation levers 21a, 21b is always present in front, so that the caster operation unit can be easily operated.
As shown in FIG. 6 (b) and FIG. 7 which is a longitudinal sectional view taken along the line bb in FIG. 6 (b), the table portion 11 having a thickness has a top plate portion, a side portion, and a bottom portion. An enclosed hollow portion 112 is formed, and the operation transmission wire 30 that couples the caster operation portion 2 and the twin wheel casters 4 (4a, 4b, 4c, 4d), and the wire branch board 32 are housed in these, and expands and contracts. A wire storage mechanism 14 that stores the operation transmission wire 30 and the like 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 to fix the covering portion (outer wire) at one end of the connecting wire 32 connected to the other end of the first wire branch board 34 and to fix the inner wire 322 (see FIG. 15). The other end of the inner wire 322 of the connecting wire 32 is connected to one end of the second wire branch board 35, and the four branch wires 33 connected to the other end of the second wire branch board 35 ( 33a, 33b, 33c, 33d) is configured to pull one end of the inner wire 332 (see FIG. 16).

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. The wire guide hole 151 is inserted into the telescopic pipe 15 that forms the wire guide portion housed in the table column 12 (12a).
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. A curved guide portion (not shown) is provided at the upper end of the upper pipe 15a 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. Yes.
The two sets of branch wires (33a, 33b) and (33c, 33d) repeat the state of relaxation and tension as the table portion 11 is raised and lowered. When the table portion 11 is lowered, the symbol A in FIG. (Bold line) When the loosened portion is accommodated in the hollow portion 112 and the table portion 11 is raised, the state becomes as indicated by the symbol B (thin line) in FIG. Store the branch wire that is not in use. 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 at the free position of the hollow part 112 of the table part 11. 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 operation of the caster operation lever 21 on the table portion 11 will be described later, each wheel lock mechanism 5 of each of the four twin-wheel casters 4 is provided via the operation transmission mechanism 3 using coaxial wires of inner wires and outer wires. 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, with reference to FIGS. 9 (a) to 9 (c), FIG. 10, FIG. 11 (a) and FIG. 11 (b) showing the outline of the mechanism of FIGS. 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 covering (outer periphery) locking unit 25, a rotation stopper 26, a caster. It consists of an unlocking holding lever 27 and a case 28.

The operation of the caster operation unit 2 is as follows. In FIG. 9A, when the user holds the grip unit 213 of the caster operation lever 21 shown in FIG. 12 and raises it, the lever base 214 of the operation lever 21 rotates. 22, the wire end (ball) locking portion 23, the rotation stopper locking portion 211, and the lock holding locking portion 212 are also rotated integrally with the caster operation lever 21. 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 ( a) on the right). As shown in FIG. 12, the grip portion 213 has a round bar shape so that it can be operated even by a child with a small hand or a weak user.
Along with this, the caster operating lever 21 has the end 311 of the inner wire 312 locked to the wire end (ball) locking portion 23, so that the direction of pulling by the wire guide pulley 24 is changed, 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.
In addition, the rotation stopper locking part 211 locks the rotation stopper 26 fixed to the case 28 side 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 bedside table 1 or to move the bedside table 1, it is shown in FIG. 9 (c) and FIG. 9 (b) during the operation. 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 to the left in the figure, and the caster operation lever 21 is lifted up to the lever housing recess 17 of the table bottom 114. As a result, the operation lever 21 turns clockwise as shown in FIG. 9C and releases the lock against the spring of the wheel lock mechanism 5.
In this state, the bedside table 1 is movable, but the caster operation lever 21 must be lifted by hand. Therefore, when maintaining the movable state 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 bedside 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.
That is, as shown in FIG. 17 (c), when one lever connecting wire 31b is pulled, the end portion 311b of the lever connecting wire 31b causes the fitting portion 3421 and the slider 342 to move and pull to the connecting wire 32. It is done. However, the other lever connecting wire 31a is left as it is, and the inner wire 312 and the other operating lever 21 connected thereto are not moved as they are. In other words, when the terminal end 311b of one lever connecting wire 31b which is the operation transmission wire 30 from the caster operating lever 21 is pulled, the wire branching board 34 moves as the fitting portion 3621, while the wire branching plate 34 Since the terminal portion 311a of the lever connection wire 31a of the other operation transmission wire of the panel 34 is detached from the fitting portion 3621, the operation lever 21 connected thereto is not affected and does not move. Therefore, since the caster operation lever that is not operated does not move, it is possible to prevent an unexpected accident such as being caught by clothes or articles of people nearby.
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.
Also, as shown in FIG. 17 (b) in the cross-sectional view along the line aa in FIG. 17 (a), this slider 342 must have the same moving distance between the end portions 311b of the two inner wires 312. A plurality of crests 3423 parallel to the moving direction of the upper surface of the slider 342 are provided, and a guide groove 3411 for guiding the crests 3423 in the left-right direction is provided in the lid 341 as shown in a side view in which the lid 341 is fitted. The slider 342 accurately moves in parallel with 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 used. 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 a 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.
A plurality of ridges 3523 parallel to the moving direction of the upper surface of the slider 352 are provided, and a guide groove for guiding the ridges 3523 in the left-right direction is provided in the lid 341 (see FIG. 17B), so that the slider 352 is accurately wired. It is designed to move parallel to the axis.
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. Even in this configuration, a plurality of crests 3623 parallel to the moving direction of the upper surface of the slider 362 are provided, and guide grooves for guiding the crests 3623 in the left-right direction are provided in the lid 341 (see FIG. 17B), so that the slider can be accurately Therefore, the inner wire 312 is pulled by at least one of the two lever connecting wires 31a and 31b in the wire branching plate 36 of the second embodiment of the wire branching mechanism. When this is done, all of the branch wires 33 (33a, 33b, 33c, 33d) are pulled together.

Thus, the forward / backward movement of the lever connecting wire 31 is transmitted to the four branch wires 33 via the wire branch board (the first wire branch board 34 and the second wire branch board 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 bedside table 1 can be freely set, and a combination of link mechanisms, 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, the inside of the hollow portion 112 of the bedside table 1 can be accurately locked and unlocked. 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 bedside table 1, and a pair of caster mounting frame bodies 132a, b and a pair of twin-wheel casters 4 (4a, 4b, 4c, 4d) across the bed D. In the present embodiment, the caster mounting frame main bodies 132a and 132b are arranged so as to be pulled into the bed D side.
The outline of the appearance of these casters 4 is as shown in FIG. 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 bedside 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 leg portions 13 of the bedside 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 bedside table 1 is almost completely fixed only by fixing, and is based on this knowledge.

First, the wheel lock mechanism 5 of the twin-wheel casters (4a to 4d) arranged on the caster mounting frame main body 132 (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. 25 (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 with the tooth portion 542 away from the internal gear 45. The knock member 531 is pulled by the branch wire 33, and the slider cam 56 resists the tensile force of the coil spring 567. Is moved to the right side in the drawing, and the tooth portion 542 is lowered against the pressing spring 543 inside the caster, that is, the caster is unlocked. FIG. 25 is a view of FIG. It is a top view from above.

  22 (a) and 22 (b) are diagrams showing a normal state of the bedside table 1, that is, a state where the operation levers 21a and 21b are lowered in FIG. In the frame 51 of the wheel lock mechanism 5, a turning support 52 is pivotally supported so that the two-wheel caster 4 can turn with respect to the caster mounting bracket 55, and a knock portion 53 that moves up and down inside the turning support 52. The wheel tooth meshing lock portion 54 is connected to the knock portion 53 via a pressing spring 543. In the state where the tooth portion 542 is raised by the pressing force of the pressing spring 543 by the cam surface 561 of the slider cam 56 that moves the knock member 531 up and down, the wheel tooth meshing lock portion 54 also has the tooth portion 542 The tooth portion 542 is engaged with the internal gear 45 inside the wheel portion 41, the rotation of the wheels 41A and 41B is prevented, and the twin-wheel caster 4 is locked.

Here, the configuration of each part will be described in more detail. First, the lock mechanism frame 51 is molded of plastic, and as shown in FIG. 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 the swivel support part 52 is inserted 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 (fixed snap ring) 524 provided at the lower end of the swivel support part 52 In order to fix the turning support portion 52 to the fixed circumferential groove 525, the snap ring 524 is locked 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, and the upper horizontal portion 5412 is engaged with the upper end portion of the spring 543 that presses and presses outwardly while the tooth portion 542 is fixed. 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 axial center of the knock member 531. When the bedside table 1 is moved, the traveling direction of the twin wheel caster 4 is automatically directed to the moving direction. Naturally, the twin wheel caster 4 does not rotate when the twin wheel caster 4 is locked. However, when the bedside 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 bedside table 1 is installed in the vicinity of the bed, the tooth portions 542a and b are engaged with 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. Therefore, the bedside 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.
By levering the operation levers 21a, b (see FIG. 9) of the caster operation unit 2 upward, the lever connecting wire 31 is pulled, and the four branch wires 33 are also pulled by the wire branch board 32. 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. , Attach the mounting fixing part 334 to the front plate 551 (see FIG. 25) of the caster mounting bracket 55, and pull on the lever connecting wire 31 and the branch wire 33 (33a, 33b, 33c, 33d: see FIG. 16) 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 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 532 of the knock member 531 comes into contact with the cam surface 561 of the slider cam 56. However, in the unlocked state where the branch wire 33 is pulled, as shown in FIGS. Since the cam surface 561 moves from the left side to the right side, the cam surface 561 is at the lowest point 5611 which is the lowest position, and the knock member 531 is pushed downward.
On the contrary, as shown in FIGS. 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 side by the coil spring 567 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 end portion 532 of the knock member 531 is also raised, and the tooth portion 542 is also raised, The inner wheel 45 of the caster 4 is fitted, and the twin-wheel caster 4 is maintained in a locked state.
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 bedside 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 levers 21a and 21b (also used for lifting and lowering the table) of the caster 4 provided on the leg 13 of the bedside table 1 When the bedside table 1 is locked and moved, as shown in FIG. 3 (FIG. 4), the operation levers 21a and 21b for maintaining the release are lifted upward to unlock the caster 4.
In order to set the caster 4 of the bedside table 1 to the original locked state and fix the height of the table portion 11, the operation levers 21 a and b are released from the hand, and the spring in the table lifting mechanism 23 and the lock in the caster 4 are locked. The operating levers 21a and 21b are naturally lowered by the spring of the pulling force of the wire by the mechanism, 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 the normal state where the bedside table 1 is arranged in the vicinity of the bed, the operation levers 21a and 21b are 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 levers 21a and 21b always pulling the wire 31, so that each wire is not in a tensioned state (relaxed state), and the wire is stretched over time. This makes it easy to maintain the device.
[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 bedside table 1 is moved, the operation levers 21a and 21b are raised, the lever connecting wire 31 is pulled up to be in a tension state, and the knocking member 531 is pushed downward by the branch wire 33. Against the pressing spring 543 in the caster, the tooth part 542 is released from the internal gear 45 of the caster. Therefore, when the operation levers 21a and 21b are raised, the double wheel caster is in the unlocked state, and the bedside table 1 is movable.

As described above, as the first embodiment, the pair of caster operating levers 21a and 21b are arranged on the left and right sides of the table support portion 122 in the vicinity of the lifting table operating lever 16, but as shown in FIG. One of the caster operating levers 21c is disposed on the table support portion 122 side of the table portion 11, and the other caster operating lever 21d is disposed on the back surface of the table portion 11 on the opposite side of the table support portion 122 from the table portion 11. It is a thing. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
In the second embodiment, when there is only one operation portion as in the prior art, a nurse or the like turns around the bed D and opposes the caster operation portion 2 of the bedside table 1 on the opposite side of the bed D. Although there is always one of the caster operation levers 21a and 21b in the vicinity of both sides of the bed, there is no need for a nurse or the like to wrap around and move the caster with a closer caster operation lever. The operation unit can be easily operated.

As described above, in the first and second embodiments, in the lifting table such as the bedside table, at least two casters are provided with a caster operation lever that simultaneously locks and unlocks all casters. Therefore, it is only necessary to operate a caster operation lever closer to the user, so that the operation is simplified and the operation is completed at one time.
Further, in the first embodiment, since there is an operation part on the front side and the opposite side of the table support part, it is different from the case of the conventional one, and it is always in front of the patient who uses the bed or the person who is going to operate. Since there is a caster operation lever, the caster operation unit can be easily operated.
Furthermore, in the second embodiment, one of the caster operation levers is arranged on the table support portion side of the table, and the other is arranged on the opposite side of the table support portion of the table. When there is a caster operation part of the bedside table on the opposite side of the bed, nurses etc. have to go around the bed and move to the opposite side, but there are caster operation parts near both sides of the bed Therefore, there is no need to go around and the caster operation part can be easily operated with a closer caster operation lever.
Also, in a normal case, the caster operation lever is naturally maintained in a state of being lowered downward by a spring force or the like to lock all the casters at once, and when moving, the caster operation lever is moved upward by the user. Since all the casters are unlocked at once, the user or patient is accidentally grasped or leans on the bedside table, so that it does not move, preventing unexpected accidents.

In addition, since the operation lever that can be operated to lock / release the casters at once is arranged on the side and bottom of the bedside table, it can be placed near the table elevating operation lever. In addition, since the caster operation lever is not provided on the table, the table top surface can be made wide and flat so as not to interfere with meals and the like.
Further, since the caster operation lever for locking / releasing the casters is provided in the vicinity of the table elevating operation lever, the operation part of the bedside table can be concentrated, and the user is less confused by the operation. In addition, since the caster operation lever is provided on the side of the bedside table, using the caster operation lever close to the user enables the locker / unlock of the casters to be operated at once, making the operation simple and one-time operation. Complete.
In this way, all casters of the bedside table can be locked and unlocked with 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.
Furthermore, since the caster operation lever that is not operated does not move, it is possible to prevent an unexpected accident such as being caught by clothes or articles of people nearby.

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 small and thin, 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.
Further, 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 portion 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 is not loosened near the table column portion 12 and is exposed to the outside. Because there is no entanglement, the operation is smooth and a clean design is possible.

  Of course, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired. For example, although a side bed table having a table that can be raised and lowered is used, a bed side table having a similar function may be used. Also, the caster operation lever is the side or bottom of the table, but if it is not the upper surface of the table, it may be provided in a plurality of easy-to-operate locations, for example, two or more locations, for example, Example 1 and Example 2 are combined. Alternatively, it may be arranged at three positions, or may be arranged at three or more appropriate positions.

D. Bed,
1 .... Bedside table, 11 .... Table part,
111 .. Edge, 112 .. Hollow part, 113 .. Side part, 114 .. Bottom part,
12. ・ Table support,
122 ・ ・ Table support part, 123 ・ ・ Basic part,
13 ・ ・ Leg part, 131 ・ ・ Staff fixing member,
132,132a, 132b ・ ・ Caster mounting frame body,
133 ...
134a, 134b, through-holes for wire communication,
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, 21c, 21d ... (Caster) operation lever, 211 ... Rotation stopper locking part,
212 ··· Lock holding latch, 213 ··· Holding portion, 214 · · Lever base,
22 ・ ・ Rotating shaft, 23 ・ Wire end (ball) locking part, 24 ・ ・ Wire guide pulley,
25 ・ ・ Wire covering (outer circumference) locking part, 26 ・ ・ Rotation 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 · Twin wheel casters,
41 ・ ・ Wheel, 41A, 41B ・ ・ Wheel,
42 .. Wheel axle, 43 .. Wheel axle fixing part, 44 .. Outer ring, 45 .. Internal gear,
5. Wheel lock mechanism,
51 ··· Lock mechanism frame, 511 · · Wheel bearing portion, 512 · · Fitting portion,
513, 515 ... Storage part, 514 ... Projection ring, 516 ... Guide groove,
52 .. Rotation support part, 521 .. Fixed support cylinder member, 522 .. Mounting edge part,
523 ・ ・ Swivel auxiliary washer, 524 ・ ・ Stopper (fixed snap ring),
525 ・ ・ Fixed circumferential groove for snap ring,
53 .. Knock part, 531 ... Knock member, 532 ... Upper tip part, 533 ... Lower tip part,
54 .. Wheel tooth meshing lock part, 541 .. Base part,
5411 ... Lower horizontal part, 5412 Upper horizontal part,
5413 ・ ・ Connecting part, 542,542a, 542b ・ ・ Tooth part, 543 ・ ・ Pressing spring,
544 ... Upper spring engagement part, 545 ... Lower spring engagement part
55 ・ ・ Caster mounting bracket, 551 ・ ・ Front plate, 552 ・ ・ Side plate,
553 ... Back plate, 554 ... Bottom plate, 555 ... Frame body mounting part, 556 ... Bolt hole,
56 ・ ・ Slider cam, 561 ・ ・ Cam surface, 5611 ・ ・ Bottom point, 5612 ・ ・ Top point,
562, 566, 568 ... Locking part, 563 ... Horizontal upper surface, 564 ... Guide slot
565 ・ ・ Guide shaft, 567 ・ ・ Coil spring

Claims (4)

The table is a bedside table that can be moved up and down, and is provided with caster operating portions having caster operating levers at two or more locations on the side or bottom of the table, and by operating at least one caster operating lever, In the bedside table that locks and unlocks all or a plurality of casters at the same time,
Locking and unlocking operation to each caster from the caster operation part is performed by a coaxial operation transmission wire, and the loose part of the operation transmission wire is stored in the hollow part in the table part or the bottom surface of the table part when the table is raised and lowered. To absorb in the part,
Of the two or more caster operation levers, a caster operation lever that is not operated is prevented from moving. Locking and unlocking operation to each caster from the caster operation unit is operated by connecting with a coaxial operation transmission wire and a wire branch board, and pulling even one of the operation transmission wires from the caster operation lever by the wire branch board. 2. The bedside according to claim 1, wherein a plurality of casters of all or less than that are simultaneously locked together and the operation transmission wires of other caster operation levers are not moved. table. When the terminal part of the operation transmission wire from the caster operation lever is pulled, the wire branch board is fitted and moved in the fitting part, and the wire branch board is moved by the terminal part of the other operation transmission wire. 3. The bedside table according to claim 2 , wherein a caster operation lever that is not operated by being detached from the fitting portion is prevented from moving. In the normal case, the caster operation lever is maintained in a state where it is lowered downward, and the four casters are locked together, and when moving, the caster operation lever is lifted upward by the user and all or less The bedside table according to claim 1, wherein the plurality of casters are unlocked collectively.

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