JP2011005219A - Fixing mechanism of bedside table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing mechanism of a bedside table, in which casters of the bedside table are locked and unlocked by one operation and in which the bedside table is simply fixed and released.SOLUTION: The fixing mechanism of a bedside table is equipped with a terminal operating part by which a plurality of double-wheel casters of the bedside table are operated for a locked state and unlocked state at one place. The double-wheel casters are provided with a wheel locking mechanism, wherein the wheel locking mechanism and the terminal operating part are connected with a coaxial wire, the operation of the terminal operating part is transmitted to the wheel locking mechanism, operating the locked state and unlocked state of the double-wheel casters.

Description

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

Conventionally, a side table has been arranged on a hospital bed or the like, and the legs of the bedside table have two frames arranged in parallel, and two or three locks at the end of each frame. Casters with levers are provided, and a total of 4 to 5 casters are arranged. One of the leg frames is inserted into the space under the bed and used as a table for meals or the like.
These caster stopper mechanisms only lock the wheels located outside the bed, not the casters placed under the bed, so you can easily hold the hand on the table plate of the bedside table. It may move and cause an unexpected accident.
Therefore, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-136370), a grounding member capable of moving up and down is provided on the caster portion of the bedside table, and when locked, the grounding member is lowered by stepping on the operation pedal. It has been proposed that the bedside table is fixed and locked by lifting the casters from the floor.

JP 2002-136370 A

  By the way, the lock mechanism of the bedside table disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-136370) basically has to make the structure of the grounding member robust in order to float the entire bedside table. Since the member also requires a large link mechanism, the link member and the operation pedal also require a considerable force.

  In order to solve the above-mentioned problems, the invention of claim 1 is a bedside table fixing device, which operates a plurality of twin wheel casters of a bedside table in a locked state and an unlocked state at one place. The double wheel caster is provided with a wheel lock mechanism, and a coaxial wire is connected between the wheel lock mechanism and the terminal operation unit to operate the terminal operation unit. It is transmitted to a wheel lock mechanism, and the locked state and unlocked state of the twin wheel caster are operated.

According to a second aspect of the present invention, in the bedside table fixing device according to the first aspect, the bottom portion of the leg portion of the bedside table is disposed on the outside of the bed and the insertion portion inserted into the space under the bed. It consists of strut support parts provided on the support part of the side table, and double wheel casters are arranged at both ends of each part, and the double wheel casters provided in the support parts are provided with a wheel lock mechanism and a turning lock mechanism And
According to a third aspect of the present invention, in the bedside table fixing device according to the first or second aspect, the turning lock mechanism operates simultaneously with the wheel lock mechanism.
According to a fourth aspect of the present invention, in the bedside table fixing device according to any one of the first to third aspects, all the twin-wheel casters are simultaneously brought into a locked state and a released state by the steering end working part. And
According to a fifth aspect of the present invention, in the bedside table fixing device according to any one of the first to fourth aspects, the wheel lock mechanism is provided with a knock member that moves up and down, and the upper end portion of the knock member is locked. Projecting from the mechanism frame, the lower end portion is interlocked with the wheel tooth engagement lock portion, and a slider cam member having a cam surface contacting the upper end portion is provided, and the knock member moves up and down along the cam surface. It is characterized by doing so.

The invention of claim 6 is the bedside table fixing device according to any one of claims 4 to 5, wherein the wire branches one operation wire from the end operation portion into four branch wires. Then, the four wheel lock mechanisms are connected, and the forward / backward movement by the inner wire of the one operation wire is transmitted as the forward / backward movement by the inner wire of the four branch wires.
A seventh aspect of the present invention is the bedside table fixing device according to any one of the fourth to sixth aspects of the fifth aspect, wherein both wires are provided between the one operation wire and the four branch wires. A wire branching mechanism connected to the terminal part is provided, and the branching mechanism is provided with a slider for fixing the four terminal parts in parallel so that the branching mechanism is flattened, and the slider is parallel to the advancing and retreating direction of the inner wire. A parallel moving means for moving is provided.

According to an eighth aspect of the present invention, in the bedside table fixing device according to any one of the first to seventh aspects, the end operation portion is provided on a leg portion of the bedside table.
A ninth aspect of the present invention is the bedside table fixing device according to any one of the first to eighth aspects, wherein the bottom surface of the leg portion of the bedside table has a substantially square shape, and the upper surface of the insertion portion. The height from the floor to the floor is lower than the height from the upper surface of the support column support portion to the floor.

According to the bedside table fixing device of the first aspect of the present invention, a plurality of casters such as the bedside table can be locked and released in one operation, and in particular, the frame of the leg portion of the bedside table One is inserted into the space under the bed, but the caster under the bed can be locked and released easily and reliably. In addition, because the coaxial wire is used for operation transmission, the position of the twin wheel casters on the back of the bedside table can be set freely. Unlike the link mechanism combination, the structure is simple, the production cost is low, and the number of parts is small. Therefore, maintenance becomes easy.
Furthermore, the bedside table can be firmly brought into the locked state and the unlocked state only by replacing the twin wheel caster part and the end operation part of the existing bedside table.

According to the bedside table fixing device of the second and third aspects of the present invention, since the turning lock mechanism is provided on the double wheel caster, the side table can be fixed and released more reliably.
According to the bedside table fixing device of the fourth aspect of the present invention, the casters at all the locations (four locations) such as the bedside table can be locked and released in one operation, and the bedside table can be easily strengthened. It can be securely fixed and released. Even if one or two casters are not sufficiently locked, the bedside table can be securely fixed and released.
According to the bedside table fixing device of the fifth aspect of the invention, the wheel lock mechanism of the caster is provided with the knock member that moves up and down and the slider cam member that has the cam surface that comes into contact with the upper end of the knock member. Since the overall height of the lock mechanism can be reduced, the leg frame provided with the wheel mechanism can be easily inserted into the space under the bed or the like.

According to the bedside table fixing device of the sixth aspect of the present invention, since one operation wire is branched into four and used, the four casters can be accurately locked and released simultaneously with a very simple configuration. Can be.
According to the bedside table fixing device of the seventh aspect of the invention, since the height of the wire branching mechanism can be made small and thin, the accommodating portion of the operation transmission mechanism of the bedside table can be made thin.
According to the bedside table fixing device of the eighth aspect of the invention, the end operation part can be provided protruding from the leg part of the bedside table, and can be easily operated when fixing the twin wheel casters on the floor surface. The locked state and the released state of the twin wheel caster can be confirmed at a glance.
In addition, since the end operation part, operation transmission mechanism, twin wheel caster, and wheel lock mechanism can be provided in the leg part, the existing bedside table is firmly locked by replacing only the leg part of the existing bedside table. And it can be easily modified into a bedside table that can be unlocked.
According to the bedside table fixing device of the ninth aspect of the present invention, the height from the upper surface of the insertion portion of the leg portion to the floor can be lowered and easily inserted into the space under the bed, and the upper surface of the column support portion. The height of the two-wheel casters can be increased by increasing the height from the floor to the floor, so that the column support portion can be stabilized and more firmly fixed to the floor.

FIG. 1 (a) is an external perspective view in a state in which a twin wheel caster of a terminal operation unit for fixing a bedside table according to an embodiment of the present invention is locked, and FIG. 1 (b) is a view of a leg portion in FIG. 1 (a). The perspective view of the joint part of a support | pillar part, The bottom view from the back side of the leg part of FIG. 1, FIG. 3 is an enlarged perspective view of the end operation unit in a state where the twin wheel caster of FIG. 1 is unlocked; The front view of the internal mechanism of the end operation part in the state where the lock of the twin-wheel caster is released, The front view of the internal mechanism of the terminal operation part of the locked state in FIG. 6A is a side view of the outer frame of the operation unit and the operation unit cover, FIG. 6B is a front view thereof, FIG. 7A is a side view of the operation unit cover, FIG. 7B is a top view thereof, FIG. 7C is a front view thereof, 8A is a side view of the release maintaining mechanism, FIG. 8B is a top view thereof, 9A is a side view of the release button, FIG. 9B is a front view thereof, FIG. 9C is a bottom view thereof, 1 is an overall configuration diagram of the operation transmission mechanism of FIG. FIG. 10 is an enlarged exploded view of the operation wire in part A of FIG. FIG. 12 (a) is an enlarged exploded side view of the branch wire of B part in FIG. 10, FIG. 12 (b) is its top view, FIG. 13 (a) is a front view of the inside of the branch board in FIG. 10, FIG. 13 (b) is a cross-sectional view of the branch board taken along line bb in FIG. 14A is a cross-sectional view of the slider in the switchboard taken along line 13a in FIG. 13a, FIG. 14B is a cross-sectional view taken in line 13a of FIG. FIG. 1 is a schematic external perspective view of the twin-wheel caster of FIG. It is a figure of one wheel part of a twin-wheel caster, Fig.16 (a) is the front view, FIG.16 (b) is the side view. FIG. 17 (a) is a front perspective view of the state in which the knock member is raised and the teeth 542 are engaged with the internal gear 45, and FIG. 17 (b) is the knock member. Side perspective view of A sectional view taken along line (a)-(a) in FIG. FIG. 19 (a) is a front perspective view of the double wheel caster in the unlocked state, and FIG. 19 (b) is a side perspective view of the knock member. FIG. 19A is a plan view from above of the caster mounting bracket of FIG. (Small-diameter twin-wheel caster (4a, 4b)) is a perspective view of the base portion 541 of the wheel tooth meshing lock portion 54, FIG. 22A is a front view, FIG. 22B is a side view, FIG. 22C is a top view, and FIG. FIG. 23A is a front perspective view of a state in which the knock member is raised and the teeth 542 are fitted to the internal gear 45, and FIG. , Side perspective view of the knock member, FIG. 24 (a) is a state of the wheel lock release of the twin-wheel caster, a front perspective view of the turning lock release, and FIG. 24 (b) is a side perspective view of the knock member. FIG. 25 (a) is a plan view of the turning prevention tooth portion, FIG. 25 (b) is a front view thereof, and FIG. 25 (c) is a side view thereof. FIG. 26 (a) is a plan view of the fixed gear, FIG. 26 (b) is a side view thereof, and FIG. (Large diameter twin wheel caster (4c, 4d)) A perspective view of the base portion 541 of the wheel tooth meshing lock portion 54, FIG. 28 (a) is an external perspective view of a state in which the twin wheel casters of the end operation portion for fixing the bedside table according to another embodiment of the present invention (embodiment 2) are locked, and FIG. The perspective view of the coupling | bond part of a part and a support | pillar part, It is a bottom view from the back side of the leg part of FIG.

  Here, a preferred embodiment of the bedside table fixing device of the present invention will be described with reference to the drawings.

(Table part and support part)
First, the first embodiment will be described. As shown in FIG. 1A, the bedside table 1 according to the first embodiment of the present invention is arranged in the vicinity of a bed of a hospital or the like. It is composed of an upper table portion 11, a support column portion 12 that supports the table portion 11, and a leg portion 13.
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 on one side by a single column portion 12, and this column portion 12 is usually In order to adjust the height of the table portion 11 located on the bed, the table portion 11 can be extended and contracted, and the length of the column portion 12 is adjusted by a height adjustment lever 121.
The column portion 12 includes a table support portion 122 of an upper quadrangular column and a base portion 123 of a small-diameter quadrangular column that fits and slides inside the support portion 122, and a foundation to the support portion 122 by a height adjustment lever 121. The degree of fitting of the portion 123 is adjusted.

The base portion 123 is fixed to a column fixing member 131 provided on the leg portion 13 so as to show a coupled state with the leg portion of FIG. The column fixing member 131 may be designed according to the shape of the various column units 12 of the bedside table 1 to be used, and can be generally applied to many bedside tables.
As shown in FIG. 1 (a), the leg portion 13 is composed of two parallel frames 132 and 133 with casters and a connecting frame body 134 connecting them, and the bedside table 1 is It has a shape that prevents it from tipping over. In the two parallel frames in the shape of letter D, the front frame 132 is usually arranged outside the bed D and mainly supports the column base 123, and the outer frame 133 is the bed D. The bedside table 1 is configured so as not to fall down by being inserted into the lower space.

As shown in FIG. 2, the bottom of the leg 13 has a substantially U-shaped bottom, and is usually located at two locations on both ends of the bottom of the frame 132 located outside the bed D. A pair of wheel wheels 4 (4c, 4d) having a relatively large wheel diameter and having a turning lock mechanism and a wheel rotation lock mechanism are attached, and are separated from the support column 12 and are usually inserted into a space below the bed D. A pair of wheel wheels 4 (4a, 4b) having a relatively small wheel diameter and a wheel rotation lock mechanism are also attached to two positions located at both ends of the bottom surface of the body 133. The casters are all unlocked all at once and can be moved easily.
In this case, as shown in FIG. 1, the total height h2 of the frame 133 to be inserted under the bed and the small-diameter twin wheel casters 4a and 4b is only (5 cm) from the floor in the space under the bed. Even if there are horizontal bars etc. that are not separated, the height is less than the movable height, and the front frame 132 is not inserted under the bed. The overall height h1 of the frame body 132 and the twin wheel casters 4c, 4d is higher than the above-described h2.

A flat storage frame 135 for storing the terminal operation mechanism and the operation transmission mechanism is provided on the side surface (outside) opposite to the bed of the support column 12 of the bedside table 1, and is attached to the storage frame 135. The distal end operating mechanism is arranged not on the center but on one side so that the user in the bed D can easily operate, and the upper end flat part 1351 is inclined slightly toward the user side. In addition, a terminal operation mechanism and an operation transmission mechanism are stored inside the storage frame body 135, and the upper end flat portion 1351 of the storage frame body 135 is provided so that the terminal operation unit 2 can be easily operated. The end operation unit 2 can simultaneously lock and release the four twin-wheel casters 4 (4a to 4d), and by operating this, the bedside table is brought into a fixed state and a movable state. Can be switched.
The end operation unit 2 is preferably positioned so as to be easily operated by a patient, a nurse, or the like, and is provided so as to protrude upward so that it can be operated by slightly folding the waist rather than the position on the floor. Of course, the upper part is easy to operate, and in some cases, it may be arranged further upward.

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

(Caster end control part)
The details of the following operation structure will be described.
FIG. 1 (a) is an external perspective view in which the four twin-wheel casters are locked in the terminal operation unit 2, and FIG. 3 is an external perspective view in a released state. The terminal operation unit 2 will be described in detail. To do.
First, FIG. 3 in a state where the locks of the four twin-wheel casters are released will be described with reference to FIG. 4 showing the internal mechanism. The terminal operation unit 2 mainly includes a handle part 21, a release maintaining mechanism 22, and a release button. 23, an operation unit cover 24 and a frame body 25.
In FIG. 4, in the handle portion 21, a rotating body portion 212 rotates around a rotating shaft 211, and a convex portion 213 is provided on a part of the outer periphery of the rotating body portion 212. This is restricted by the rotation restriction range of the groove portion 252 provided in the body storage portion 251.
A locking portion that locks the end portion 311 of the inner wire 312 called a tie on the operation portion side of the operation wire 31 of the operation transmission mechanism 3 is provided at a rotating portion in the vicinity of the rotation shaft 211 of the rotation barrel portion 212. 214 is provided, and the end portion 311 is locked to the locking portion 214 along the terminal portion introduction groove 215. The handle portion 21 (front side) is provided with a grip portion 217 into which four fingers can be inserted. As shown in FIG. The end portion 311 of the operation wire 31 is also lifted up.

When the handle portion 21 is pulled up to a predetermined position, the distal end portion 2211 (see FIG. 8) of the lock member 221 (see FIG. 4) of the release maintaining mechanism 22 is engaged with the lock member provided at an appropriate position on the outermost periphery of the handle portion 21. The lock member 221 is configured to be fitted in the stop hole 218. For this purpose, the lock member 221 is accommodated in the slide hole 254 provided in the guide wall 253 that guides the rotation side portion 216 of the frame 25 so as to be movable left and right. The rear end portion 2212 (see FIG. 8) of the member 221 is always pressed by the spring member 222 provided in the spring accommodating portion 255.
Therefore, the handle portion 21 is pulled up until the distal end portion 2211 of the lock member 221 is fitted into the lock member locking hole 218, and this position is maintained by the fitting of the lock member locking hole 218. That is, the state in which the inner wire 312 is pulled is maintained, and as a result, the knock member 531 (see FIG. 19) provided in the twin-wheel caster 4 is pushed down, and the tooth mold 542 of the base 541 interlocked with the knock member 531 ( 17 and 19) is released from the engagement of the caster internal gear 45 (see FIG. 19), and this unlocked state is maintained.

The release maintaining mechanism 22 is provided by engaging the release button 23. The release button 23 is fitted in the release button sliding hole 256 of the frame 25, as shown in FIGS. 8 (a) and 8 (b). In addition, a pair of pins 223 are provided on both outer circumferences at substantially the center in the axial direction of the lock member 221 of the release maintaining mechanism 22.
As shown in a side view of FIG. 9A, a front view of FIG. 9B, and a bottom view of FIG. 9C, the lower prismatic portion 231 of the release button 23 has a bifurcated portion 2311 so that the lock member 221 can slide. The bifurcated portion 2311 is provided with an oblique cam long hole 232, and a pin 223 is fitted in the cam long hole 232, and the tip 2211 of the rod-shaped lock member 221 has the rear end 2212 as a spring member. When it is always pressed by 222 and fits in the lock member locking hole 218 and moves to the left (see FIG. 4), the lower square column part 231 of the release button 23 has a rectangular cross section, and is provided in the frame 25 that accommodates it. Further, the rotation is restricted by the release button sliding hole 256 (see FIG. 4) having the same rectangular cross section, and the upper end operation portion 233 of the release button 23 is raised.
Here, in order to bring the twin-wheel caster 4 into the unlocked state, first, as shown by a one-dot chain line in FIG. 4, the operation unit cover 24 is retracted rearward (on the right side in FIG. 4) on the upper end flat portion 1351, The handle portion 21 of the operation unit 2 is raised upward. In this state, the tip of the release button 23 is in a protruding state.
Note that the release button 23 may be a conspicuous color, for example, red or green, for invoking a dangerous state in order to function more effectively as a release display button.

Next, with respect to a state where the wheels of the four twin-wheel casters of FIG. 1 are locked, the internal mechanism will be described with reference to FIG. The pin 223 also moves along the cam surface against the spring member 222 that presses (right side direction in FIG. 5), and the distal end portion 2211 of the fitting lock member 221 moves backward (right side) to lock the handle portion 21. The handle portion 21 is released from the locking hole 218 and is pulled downward by the end portion 311 of the operation wire 31.
The downward pulling force is generated via the slider cam 56 (see FIG. 17), the branch wire 33, and the operation wire 31 by the knock member 531 being lifted by the pressing spring 543 (see FIG. 17) inside the caster. When only the downward pulling force by the four pressing springs 543 is insufficient, the tension spring 2161 indicated by the dotted line in FIG. 4 and FIG. The other end is fixed to the bottom surface of the handle portion 21.
Then, by this tensile force, the upper end surface 219 of the handle portion 21 becomes substantially the same level as the surface of the upper end portion 1351, and the state shown in FIGS. 1 and 5 is obtained.

Further, when the handle portion 21 suddenly generates noise due to the pulling force of the spring, the return speed may be reduced by a shock absorber 2162 indicated by a two-dot chain line in FIGS. Further, one end of the shock absorber 2162 is fixed to the bottom of the internal space of the frame body 25, and the other end is fixed to an appropriate position of the handle portion 21.
Here, since the upper end surface 219 of the handle portion 21 and the upper end operation portion 233 of the release button 23 are both lowered, the level is substantially the same as the surface of the upper end flat portion 1351 of the storage frame 135. The operating unit cover 24 is moved forward to cover the handle unit 21 and the release button 23 so that they cannot be operated.

The configuration and operation of the operation unit cover 24 will be described mainly with reference to FIGS.
6 (a) and 6 (b), the handle portion 21, the release maintaining mechanism 22 and the release button 23 are assembled in the frame 25, and the frame 25 is attached to the right side surface. Is completed by attaching an outer frame 26 that covers a part and an outer frame 27 that covers a part of the upper surface and the left side surface, and the operation unit cover 24 is attached thereto.
A step 261 is provided in the parallel direction on the right outer frame 26 located outside, and a step 271 is also provided in the parallel direction on the left outer frame 27 located on the inside, and the operation portion cover 24 is fitted into the step 261.

As shown in FIGS. 7A, 7B, and 7C, the operation unit cover 24 includes a right side plate 241, a left side plate 242, an upper plate 243, and a back plate 244. The fitting protrusion 2411 is provided in the parallel direction, and similarly, the fitting protrusion 2421 is provided in the parallel direction on the inner side of the lower end of the left side plate 242, and the operation portion cover 24 is made of a somewhat elastic synthetic resin. Then, both the fitting protrusions 2411 and 2421 are expanded at the head portion and are fitted to the respective steps 261 and 271.
A rectangular notch 2431 is provided at the front end in the moving direction of the upper plate 243 of the operation unit cover 24. When the operation unit cover 24 covers the handle portion 21 and the like, the notch 2431 is formed on the frame 25. It is fitted into a rectangular step 257 provided at the top end portion (left end in FIG. 6B), and further movement is restricted. Similarly, the operation unit cover 24 and a pair of back plate members 2441 and 2442 are provided on the back plate 244 of the operation unit cover 24 so as to straddle the upper end flat portion 1351 of the storage frame body 135. Restrict further movement in contact.
In addition, a stopper projection 272 is provided at a suitable position on the outer frame 27 so that the operation section cover 24 does not fall back too far, and a stopper engaging section 2422 is disposed at a suitable position near the beginning of the lower portion of the left side plate 242 of the operation section cover 24. Is provided.

(Operation transmission mechanism)
As shown in FIG. 10, the operation transmission mechanism 3 uses a coaxial so-called lock wire composed of an inner wire as a core and an outer wire that is also a covering portion, and mainly includes an operation wire 31 and a wire branch board 32. And four branch wires 33.
As shown in FIG. 11 of the enlarged view of the end portion A, the operation wire 31 attached to the end operation portion 2 is composed of a core inner wire 312 and a covering portion 313 which is an outer wire covering the inner wire 312. The distal end of the wire 312 is provided with an end portion 311 called a so-called columnar shape, the mounting portion 314 is provided at the distal end of the covering portion 313, and the inner wire 312 is connected to the end portion 311 with respect to the mounting fixing portion 314. The other end 316 (see FIG. 13) is connected to the slider 322 (see FIG. 13) of the wire branch board 32.
Among the four branch wires 33 from the wire branch board 32, as shown in FIGS. 2 and 10, the branch wires 33a and 33b connected to the twin wheel casters 4a and 4b of the frame 132 are short, and the twin wheel casters of the frame 133 are short. The branch wires 33c and 33d to 4c and 4d are long, as shown in the side view of FIG. 12 (a) which is an enlarged view of the end B in FIG. 10 and the top view of FIG. 12 (b). The inner wire 332 and the covering portion 333 that covers the core wire 332 are provided, and the distal end of the wire 332 is provided with an end portion 331 having an engagement hole at the center, and the fixing portion 334 is provided at the distal end of the covering portion 333. Thus, the inner wire 332 is configured such that the end portion 331 can advance and retreat with respect to the mounting fixing portion 334, and the other end is connected to the wire branch board 32.

As shown in FIGS. 13A and 13B, the wire branching board 32 of the wire branching mechanism connects the operation wire 31 and the four branching wires 33. The wire branching board 32 of FIG. Inside the lid 321 (FIG. 13B), the slider 322 is accommodated so as to be movable left and right. An attachment fixing portion 315 of the operation wire 31 is attached to the side plate 323 on the operation wire 31 side of the wire branch board 32, and a fitting portion 3221 of the end portion 316 of the wire is provided on the operation wire 31 side of the slider 322. Mating.
Further, the fixing portion 335 of the branch wire 33 is attached to the side plate 324 on the side of the four branch wires 33 of the wire branch board 32, and the end portion 336 of the four wires is fitted to the branch wire 33 side of the slider 322. A portion 3222 is provided to engage the end portion 336. Thus, when the terminal portion 316 of the operation wire 31 is pulled, the slider 322 moves to the side plate 323 side (FIG. 13: right direction), but the four end portions 336 fitted to the slider 322 are also collectively. And move away from the side plate 324 (FIG. 13: right direction).

As shown in the sectional view taken along the line aa in FIG. 13A of FIG. 14A and the sectional view taken along the line cc in FIG. 13A of FIG. If the movement distances of the end portions 336 of the inner wires are not the same, the four twin-wheel casters cannot be locked accurately. For this reason, a plurality of peak portions 3223 parallel to the moving direction of the upper surface of the slider 322 are provided, and as shown in the side view in which the lid 321 of FIG. A groove 3211 is provided on the lid 321 so that the slider 322 accurately translates with respect to the wire axis. Of course, conversely, a parallel peak may be provided on the lid 321 and a corresponding guide groove may be provided on the slider. A fixing convex portion 3212 is inserted and fixed to the inner wall of the wire branch board 32 on the fitting side surface of the lid 321.
Therefore, as a parallel advance / retreat movement means for moving the slider 322 in parallel with the advance / retreat direction of the inner wires 312, 332, as well as the both side walls inside the wire branch board 32, this alone is not sufficient for parallel movement. Therefore, a plurality of parallel ridges 3223 are provided on the upper surface of the slider 322, and guide grooves 3211 for guiding the ridges 3223 in the left-right direction are also provided on the lid 321 side.

Thus, the forward / backward movement of the operation wire 31 is transmitted to the four branch wires 33 via the wire branch board 32. The four branch wires 33 and the mounting fixing portion 335 are arranged in parallel in the branch board 32, but this is a storage frame that protrudes upward from the leg 13 on the side surface of the bedside table 1. Since it is fixed in the body 135, the length of the operation wire 31 is not affected even if the support column 12 expands and contracts.
Moreover, since the coaxial wire was used for operation transmission, as shown in FIG. 2, the position of the four twin-wheel casters 4 of the leg portion 13 of the bedside table 1 can be freely set. Unlike the grounding member for floating the entire bedside table as in the above-mentioned Patent Document 1, the structure is simple, the production cost is low, and maintenance is easy. Furthermore, since one operation wire 31 is branched into four, it is possible to accurately lock and unlock the four casters at the same time with a very simple configuration, and to lower the height of the wire branch mechanism. Since it can be made thin, it can be stored together with the end operation part 2 in the thin storage frame 135 on the side surface of the bedside table 1.
In other words, a caster which is a four wheel lock mechanism is formed by branching one operation wire 31 from the end operation portion 2 of the upper end flat surface portion 1351 of the oblique upper portion of the end storage frame body 135 into four branch wires 33. Connected to the operation mechanism, the forward / backward movement of the inner wire 312 of one operation wire 31 is transmitted to the forward / backward movement of the inner wires 332 of the four branch wires 33. In order to branch this one operation wire 31 into four branch wires 33, a wire branch board 32 is provided as a wire branch mechanism, and a slider 322 for fixing the four terminal portions 331 in parallel on the wire branch board 32. The slider 322 is moved exactly in parallel with the forward and backward direction of the inner wires 312 and 332.

(Arrangement of twin wheel casters)
FIG. 2 described above is a plan view of the back surface of the leg portion 13 of the bedside table 1. A pair of twin wheel casters 4 (4 c, 4 d) are attached to both ends of the frame 132 outside the bed D, and the floor surface under the bed D is shown. A pair of twin wheel casters 4 (4a, 4b) are attached to both ends of the frame 133.
The outline of the outer appearance of these casters 4 is as shown in FIG. 15, and the details of the configuration of the casters 4 will be described later. A pair of wheels 41A are provided on both sides of a frame 51 of a wheel lock mechanism 5 that is a caster operating mechanism. Each of the 41B is rotatably supported, and on the upper surface of the lock mechanism frame 51, a turning support 52 is provided for pivotally supporting the caster 4 with respect to the mounting frame. A knock member 531 that moves up and down is provided coaxially with the shaft center X. When the knock member 531 is pushed up by the pressing spring 543, the two-wheel caster is locked and the wheel cannot rotate. On the contrary, when the push-up of the knock member 531 is released and pushed down downward, the tooth portion 542 to the internal gear 45 of the double wheel caster 4 is released and the lock is released, so that the double wheel can freely rotate.
By the way, the twin-wheel casters 4 (4a, 4b, 4c, 4d) used in this embodiment are more stable than the single-wheel casters because the width of the twin wheels is wider than that of the single wheels. Locking can prevent turning because of the wide width of the twin wheels as well as the direction of travel. In particular, when the rotation of each twin wheel on the four twin wheel casters 4 (4a, 4b, 4c, 4d) is locked as in this embodiment, the forward / backward / left / right movement and turning are locked, and one twin wheel caster is fixed. In some cases, the casters 4 of the bedside table 1 are almost fixed even at two places on the table support side, and the casters 4 are fixed more securely at the three places. When the casters at the locations are locked, the bedside table 1 is securely fixed at a predetermined position.
Therefore, as in this embodiment, when the four casters are locked, even if the lock mechanism of one of the four casters is incomplete or damaged, the 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 described above, the twin-wheel caster 4 having a pair of wheel rotation lock mechanisms at two ends on the back of the frame 133 inserted into the space below the bed D ( 4a, 4b) have a relatively small diameter of the wheel 41, and a pair of turning lock mechanisms and a wheel rotation lock mechanism at two positions on both ends of the front frame 132 arranged outside the bed D; The two-wheel caster 4 (4c, 4d) having a different diameter is that the wheel 41 has a relatively large diameter, and the other specific configurations are the same except only the presence or absence of a turning lock mechanism described later. Therefore, the twin wheel casters (a to d) will be described collectively.
As shown in FIG. 2, one wheel portion 41 is arranged on each side of the four twin-wheel casters 4, and one of the wheel portions 41 includes a wheel shaft 42, which will be described later. The wheel lock mechanism 5 is rotatably supported by a wheel bearing portion 511 (see FIG. 19), and is fixed to the wheel shaft fixing portion 43 of the wheel portion 41 in FIG. (It may be configured to be pivotally supported.) The outer ring 44 of the wheel portion 41 is made of rubber and absorbs vibrations, smoothes running, reduces noise, and strengthens the grip to the floor.
Further, an inner gear 45 coaxial with the wheel shaft is formed in the vicinity of the outer ring inside the wheel portion 41 of the twin-wheel caster 4. When a lock tooth portion 542 described later is raised by the pressing spring 543, the inner gear 45 The teeth 542 mesh with each other to prevent the wheel 41 from rotating.

(Caster wheel lock mechanism)
As described with reference to FIG. 15, 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. In addition, 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 frame of the leg portion 13 of the bedside table 1 is used. If the two-wheel casters 4c, 4d at both ends of the body 132 and the wheels 41A, 41B of the two-wheel casters 4a, 4b at both ends of the frame 133 are fixed, the turning of the caster 4 itself is not fixed. The bedside table 1 is found to be almost completely fixed only by fixing the rotation of the wheel, and is based on this knowledge.
However, if the distance between the wheels 41A and 41B is narrowed, it becomes close to a single wheel state, or if the wheel diameter is reduced, this fixing operation becomes weak, so the frame 132 that supports the column fixing member 131 that is loaded in the lateral direction. The two-wheel casters 4c and 4d have a turning lock mechanism.

(Wheel lock mechanism for small diameter twin wheel casters (4a, 4b))
First, the wheel lock mechanism of the small-diameter twin wheel casters (4a, 4b) disposed on the frame 133 of the wheel lock mechanism 5 will be described in more detail with reference to FIGS.
FIG. 17 is a view of the caster locked state, in which the knock member 531 is loosened of 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. 17 (a) is a transverse sectional view of the wheel locking mechanism 5, and FIG. 17 (b) is a side sectional view of FIG. 17 (a). FIG. 18 is a cross-sectional view taken along the line aa in FIG. 17A, 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. 19 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. It is a top view from above.

  17 (a) and 17 (b) are diagrams showing a normal state of the bedside table 1, that is, a view in which the handle portion 21 is lowered to lock the twin wheel caster 4 in FIG. The pivot support 52 is pivotally supported so that the two-wheel caster 4 can pivot with respect to the caster mounting bracket 55, and a knock part 53 that moves up and down is provided inside the pivot support 52. Thus, the wheel tooth meshing lock portion 54 is connected via a pressing spring 543. The wheel tooth meshing lock portion 54 is configured so that the tooth portion 542 is also in a state where the knock portion 53 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 tooth portion 542 is engaged with the internal gear 45 inside the wheel portion 41 to prevent the wheels 41A and 41B from rotating, and the twin wheel caster 4 is brought into a locked state.

Here, the configuration of each part will be described in more detail. First, the frame body 51 is molded of plastic, and as shown in FIG. 17, a wheel bearing portion 511 is provided at the center, and the left side of the frame body 51 is provided. Are provided with a cylindrical fitting portion 512 into which the turning support portion 52 (knock portion 53) is inserted and a storage portion 513, and the portion of the fitting portion 512 adjacent to the caster mounting bracket 55 turns the twin-wheel caster 4. A projecting wheel 514 is provided for smoothness, and a wheel tooth meshing lock portion 54 that moves up and down and a storage portion 515 that stores the pressing spring 543 are disposed above the wheel bearing portion 511. The fitting part 512 of the twin-wheel caster 4 including the storage part 515 and the turning support part 52 are firmly supported in a freely rotatable manner, but the turning support part 52 is firmly fixed to the caster mounting bracket 55 side.
In addition, the storage part 513 has an opening on the lower side and one side (a dust cover may be provided if necessary), which is fixed to the caster mounting bracket 55 during assembly work. The turning support washer 523 and the stopper (fixed snap ring) 524 are attached so that the turning support portion 52 to be rotated can be freely rotated on the fitting portion 512.
After inserting the swivel support part 52 into the fitting part 512, a swivel auxiliary washer 523 is inserted into the lower end of the swivel support part 52, and used for a fastener (snap ring) provided at the lower end of the swivel support part 52. A snap ring 523 is locked in the fixed circumferential groove 524 to fix the turning support portion 52 so that the turning support portion 52 does not fall out of the lock mechanism frame 51.

  Further, a base portion 541 of the wheel tooth meshing lock portion 54 is attached to the lower end portion of the knock member 531 of the knock portion 53, and this base portion 541 is shown in FIG. The lower horizontal portion 5411, the upper horizontal portion 5412, and a connecting portion 5413 that connects the lower horizontal portion 5411, the upper surface of the lower horizontal portion 5411 is the lower tip of the knock member 531 The upper horizontal portion 5412 has a pressure receiving portion that is pressed or released (released in FIG. 19) 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. 17 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. 15, the turning of the twin wheel caster 4 means that 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 are eccentric. When the side table 1 is moved, the traveling direction of the twin wheel caster 4 is automatically directed to the moving direction. Naturally, when the twin wheel caster 4 is locked, the twin wheel caster 4 does not rotate. Turning is prevented, but conversely, if the bedside table is not locked when moved, it must be turned freely. 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. 21, the base 541 has a U-shaped cross section of the base 541 (from the opposite side, an inverted U-shape) at the lower surface of the upper horizontal portion 5412 (in FIG. 17), 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. 16 and 18, the tooth portions 542a and b of the wheel tooth meshing lock portion 54 are always pressed upward by the pressing spring 543 and lifted up unless the knock member 531 is regulated. In the normal case where the bedside table 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, It is locked and it is impossible to move the bedside table.
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 frame 51.
Further, a concentric internal gear 45 is formed on the wheel shaft in the vicinity of the outer ring inside the wheel portion 41 of the twin-wheel caster 4, and when the tooth portions 542a and b rise, the tooth portion 542 meshes with the internal gear 45. The rotation of the wheel portion 41 is prevented.

(Caster mounting bracket and slider cam)
The slider cam 56 for operating the caster mounting bracket 55 and the knock member 531 in FIGS. 19 to 22 will be described.
The operation wire 31 is pulled by the operation of raising the handle portion 21 (see FIGS. 4 and 5) of the terminal operation unit 3, and the four branch wires 33 are also pulled by the wire branch board 32 (see FIG. 13). . Further, the inner wire 332 of each branch wire is pulled, and this is converted into the movement of the knock portion 53 by a slider cam 56 having a slider-like cam mechanism attached to the caster mounting bracket 55.
As shown in FIG. 22, the slider cam 56 is mainly provided with a cam surface 561 having a flat overall shape and an inclined lower surface, and an end portion 331 of the branch wire 33 is provided at one end in the direction in which the slider cam 56 moves. Connect the mounting fixing part 334 to the front plate 551 (see FIG. 20) of the caster mounting bracket 55, and connect it to the operation wire 31 and branch wire 33 (33a, 33b, 33c, 33d: see FIGS. 10 and 13). By being pulled, it moves horizontally as a whole. As shown in FIGS. 19, 20, and 22, 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. 17 when the operation wire 31 and the branch wire 33 are relaxed. Further, as shown in FIGS. 20 and 22, the axis of the guide shaft 565 intersects with the axis of the upper tip portion 532 of the knock member 531.
In FIG. 20, 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 in the bolt holes 556 at both ends of the caster frame bodies 132 and 133. Etc. are inserted and fixed.

Therefore, the upper end 532 of the knock member 531 comes into contact with the cam surface 561 of the slider cam 56, but in the unlocked state where the branch wire 33 is pulled, 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. 17 and 18, in a state where the operation wire 31 and the branch wire 33 are relaxed, the slider cam 56 is moved to the left side as shown in FIGS. The surface 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, and the internal gear of the twin-wheel caster 4 Fit to 45 and lock the twin-wheel caster 4.
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. 17) is substantially the same as the distance Y (see FIG. 22) 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 of the present embodiment is configured as described above, it operates generally as follows.
As shown in FIG. 1, the handle part 21 for unlocking the caster 4 provided on the leg part 13 of the bedside table 1 is locked when the caster 4 is locked in a normal installation state. Although it is covered with the operation unit cover 24 (see FIG. 1), when moving the bedside table 1, as shown in FIG. 3.4, the operation unit cover 24 is moved backward to maintain the release. The handle 21 is lifted up to a position where the lock member 221 fits into the lock member engagement hole of the handle 21, and a release button that is a lock release display button by moving the lock member 221 for maintaining the release at this time Unlock caster 4 by protruding 23.
In order to return the caster 4 of the bedside table 1 to the original locked state, the lock member 221 to be released and maintained is pushed backward by pushing the release button 23 which is the unlock display button downward, and the handle portion 21 is locked in the caster 4. Since the wire is pulled down by the pulling force of the mechanism by the mechanism or the tension spring 2161 that cooperates, the operation unit cover 24 is moved forward in this state to the original state shown in FIG. The operation of the twin wheel caster in the locked / released state will be described in more detail.

[Lock state of twin wheel caster]
The twin-wheel caster 4 is locked as shown in FIG.
In a normal state in which the bedside table 1 is arranged in the vicinity of the bed, the handle portion 21 and the release button 23 are both stored in the lower storage position, and these are covered with the operation cover 24, and the storage frame of the bedside table 1 The branch wire 33 is fitted to the internal gear 45 of the caster by the pressing spring 543 in the caster as a result, and the height is substantially equal to the oblique upper end flat part 1351 of the body 135 (see FIG. 5). The knock member 531 is also above the pressing spring 543, and the branch wire 33 is also in a relaxed state. Although the state in this case lasts for a long time, it is not necessary to keep the handle part 21 always pulling the wire 31, so that each wire is not in a tensioned state (relaxed state), and the wire stretches over time. And the maintenance of the device becomes easy.
[Unlocking condition of twin wheel caster]
The unlocked state of the twin-wheel caster is as shown in FIG.
In this case, while moving the bedside table, the operation cover 24 is retracted, the handle portion 21 is raised to release the release button 23, the operation wire 31 is pulled up to be in tension, and the branch wire 33 is knocked. The member 531 is pushed downward, and as a result, against the pressing spring 543 in the caster, the tooth portion 542 is released from the internal gear 45 of the caster. Therefore, when the handle portion 21 is raised, the two-wheel caster is in an unlocked state, and the bedside table can be moved.

(Wheel lock mechanism and swivel lock mechanism of large diameter twin wheel casters (4c, 4d))
First, the wheel lock mechanism of the large-diameter twin wheel casters (4c, 4d) disposed in the storage frame body 135 of the wheel lock mechanism 5 will be described in more detail with reference to FIGS.
The wheel lock mechanism of this large-diameter twin wheel caster (4c, 4d) is slightly larger than the wheel lock mechanism of the aforementioned small-diameter twin-wheel caster (4a, 4b) except for the turning lock and unlock and the size of the wheel diameter. However, since the structure, operation, and function are the same, the description is omitted. Note that the symbols of the large-diameter twin wheel casters (4c, 4d) and the small-diameter twin wheel casters (4a, 4b) are the same.
FIG. 23 is a view of a normal state, that is, a caster lock state, in which the knock member 531 is loosened of the branch wire 33, the slider cam 56 is moved to the left side of the drawing by the coil spring 567, and the knock portion 53 is raised upward. FIG. 23A is a cross-sectional view of the wheel lock mechanism 5, and FIG. 23B is a side cross-sectional view of FIG.
Further, FIG. 24 shows that the tooth portion 542 of the wheel lock mechanism is separated from the internal gear 45, and at the same time the bifurcated tooth 5461 of the rotation prevention tooth portion 546 of the rotation lock mechanism is perpendicular to the fixed gear 518 (see FIGS. 26 and 27). The slider cam 56 is pulled by the branch wire 33, and the slider cam 56 moves to the right side of the drawing against the pulling force of the coil spring 567. It is a figure of the state which descend | falled below, and is a figure of the state which the tooth | gear part 542 fell against the press spring 543 inside a caster, ie, the figure of the lock release state of the twin-wheel caster 4.
Although the plan view of the large-diameter twin-wheel caster is omitted, it is the same as FIGS. 18 and 20 of the small-diameter twin-wheel caster, and the configuration and description are the same.

The most different configuration from the wheel lock mechanism of the small-diameter twin wheel casters (4a, 4b) is that, as shown in FIG. 23, a swivel lock mechanism of the twin wheel casters 4 is added, and this mechanism is a frame with casters ( A fixing gear 518 as shown in FIGS. 25 and 26 is fixed to the lower end of the turning support portion 52 fixed to the caster mounting bracket 55 on the 132 side. Oppositely, the bifurcated tooth 5461 of the turning prevention portion 546 is provided on the wheel tooth meshing locking portion 54 on the lock mechanism frame 51 side of the turning caster 4.
As shown in FIG. 27, the shape of the lower horizontal portion 5411 at the base portion 541 of the wheel tooth meshing lock portion 54 is slightly different from that of the small-diameter twin wheel casters (4a, 4b), and the lower horizontal portion 5411 is shortened and its tip is The horizontal base portion 5462 of the turning prevention tooth portion 546 is welded to the upper surface of the horizontal base portion 5462 of the turning prevention tooth portion 546 so as to receive the lower tip portion 533 of the opposing knock member 531.
As shown in FIG. 25, the rotation preventing tooth portion 546 is provided with bifurcated teeth 5461 where the end of the horizontal base portion 5462 on the welding side rises at a right angle. The tooth portion 5181 is a bifurcated tooth so as to be fitted between the teeth of the tooth portion 5181 of the fixed gear 518.
As shown in FIG. 26, the fixed gear 518 is provided with eight tooth portions 5181 in a radial manner in this embodiment, and the center hole 5182 is a lock-like hole so as not to rotate the shaft of the turning support portion 52. .

[Rotation lock state]
First, the turning lock state will be described with reference to FIGS.
In a state where the handle portion 21 of the end operation portion 2 in FIG. 5 is lowered, that is, in a normal state, when the inner wire 312 is loosened, the inner wire 332 is also loosened. Further, the knock member 531 is moved by the slider spring 56 by the coil spring 567. Is moved to the left side in the figure, and the knock member 531 is also raised with the knock portion 53 being raised upward, and accordingly, the wheel tooth meshing lock portion 54 is raised, and the bifurcated teeth of the turning prevention portion 546 on the base portion 541 5461 is also raised, and this bifurcated tooth 5461 is fitted to any tooth portion 5181 of the fixed gear 518 fixed to the lower end of the turning support portion 52 on the frame 132 side, and the wheel tooth meshing lock portion 54 and the lock The mechanism frame 51 is prevented from turning. In this case, the wheel tooth meshing lock portion 54 always acts so as to be pushed up by the first pressing spring 543, but in order to make the fitting of the bifurcated teeth 5461 of the turning prevention tooth portion 546 more reliable, A pressing spring 547 is provided at the bottom of the horizontal base portion 5462 so that the wheel tooth engagement lock portion 54 is always pushed up.
Thus, in the normal state in which the bedside table 1 is placed on the bed D, the wheel lock mechanisms 4c and 4d of the twin wheel casters 4c and 4d are operated by the wheel lock mechanism and the turning lock mechanism of the two wheel casters. Combined with the mechanism 5 working, the bedside table 1 is firmly fixed to the floor so as not to move.

[Swivel unlock state]
Next, the turning lock release state will be described with reference to FIGS.
When moving the bedside table 1 by raising the handle portion 21 of the end operation portion 2 in FIG. 4, when the inner wire 312 is pulled by the handle portion 21 and the inner wire 332 connected to the slider cam 56 is also pulled, The knock member 531 moves against the coil spring 567 and the slider cam 56 moves to the right side in the drawing, the knock member 531 also descends, and accordingly, the wheel tooth engagement lock portion 54 descends, and the fork stop portion 546 on the base 541 is bifurcated. The tooth 5461 is also lowered, and the bifurcated tooth 5461 is separated from the tooth part 5181 by the fixed gear 518 fixed to the lower end of the turning support part 52 on the frame body 132 side, and the turning lock mechanism of the wheel tooth meshing lock part 54 The lock is released, and the two-wheel casters 4c and 4d can freely turn with respect to the mounting frame 132 (see FIG. 2).
Thus, in the state in which the bedside table 1 moves on the bed D, the two-wheel casters 4c and 4d have the wheel lock mechanism of the twin-wheel caster in the unlocked state, and the turning lock mechanism also functions in the unlocked state. , 4b, in combination with the wheel being unlocked by the wheel lock mechanism 5, the bedside table 1 can be moved.

Next, the bedside table fixing mechanism according to the second embodiment will be described with reference to FIGS.
As shown in FIG. 28, the second embodiment is different from the first embodiment in the [table portion] and the [column portion] in the arrangement position and shape of the storage frame body 135 that stores the terminal operation unit 2. However, since only the shape of the leg portion 13 is different and the other configurations are the same, the description thereof will be omitted, and only the storage frame body 135 and the leg portion 13 will be described.
In the first embodiment, the handle portion 21 and the end operation portion 2 are arranged so as to be shifted laterally on the leg portion 132 from the support column portion 12 so that a user such as a patient of the bed D can easily operate. In the center of the leg portion 132, it is arranged in the vicinity of the column portion 12. This can be operated by the user, but is arranged at a position where nurses and attendants can easily operate, and the upper end flat portion 1351 of the storage frame 135 is placed horizontally with the handle portion 21 of the end operation portion 2. Therefore, at the time of ending the twin wheel caster 4 in the unlocked state, or at the time of starting the locked state, the handle portion 21 applies a force directly above or below, so that the bedside table does not move.
Furthermore, in the first embodiment, the small-diameter twin wheel casters 4a and 4b are used so that the frame 133 can be inserted under the bed of the bedside table 1 even when the operation rod is present at a low position in the space under the bed D. However, in the second embodiment, as shown in FIG. 29, large-diameter twin wheel casters 4a ′ and 4b ′ are used. For this reason, a turning lock mechanism can be mounted on the large-diameter twin wheel casters 4a ′ and 4b ′, and the bedside table 1 is more firmly fixed and the safety is improved.
In order to provide the relatively large-diameter twin-wheel casters 4a ′ and 4b ′, the leg portion 13 is formed by two parallel caster-shaped frames 132 and 133 having a letter “E” shape as shown in FIG. The width and height h3 are almost the same.
Accordingly, the two parallel frames in the shape of letter “E” are usually arranged such that the front frame 132 is arranged outside the bed D and mainly supports the support base 123, and the outer frame 133 is the bed D. The bedside table 1 is inserted into the lower space so that the bedside table 1 does not fall down.

As described above, in each embodiment, four twin wheel casters 4 (4a to 4d) such as the bedside table 1 can be locked and released in a single operation, and the end operation portion of the bedside table 1 can be easily obtained. 2 can be reliably fixed and released, and the coaxial wires 31 and 33 are used for the operation transmission mechanism 3, so that the position of the two-wheel caster 4 on the back surface of the leg 13 of the bedside table 1 can be freely set. Also, unlike the conventional link mechanism combination, the pressing mechanism of the base 541 such as the knock member 531 and the turning lock mechanism are housed in the lower part inside the operation mechanism of the twin wheel casters (4a to 4d) of both embodiments, The entire base portion 541 is formed in a U-shape that surrounds the wheel bearing portion 511, and a tooth lock meshing mechanism of the wheel lock is provided on the upper portion, so that the dead space inside the twin wheel caster operating mechanism can be reduced. Therefore, a smaller twin-wheel caster can be obtained, and the structure is simple, the production cost is low, the number of parts is small, and maintenance is easy, so that one operation wire 31 is divided into four branch wires 33. Therefore, the four twin-wheel casters 4 can be accurately and simultaneously locked and released with an extremely simple configuration.
Further, the four casters such as the bedside table can be locked and released by the operation of the end operation unit 2, and in particular, one of the frame bodies of the leg portions of the bedside table is inserted into the space under the bed D. Even in this inserted state, the height of the twin wheel casters 4a and 4b is low, so that even if there is an operating horizontal bar or the like at a low position in the space under the bed D, it can be easily inserted.

Further, the twin wheel casters 4c and 4d located outside the bed D lock the turning of the two wheel casters 4c and 4d of the turning lock mechanism in addition to the double wheel lock state of the wheel locking mechanism, so that the bedside table can be more reliably attached. 1 can be fixed to the floor.
Thus, the locked state and the released state of the twin wheel casters 4 under the bed can be easily and reliably performed. Even if one or two casters are not sufficiently locked, the twin-wheel casters 4 of the bedside table 1 can be reliably locked and unlocked.

In addition, since the end operation unit 2, the operation transmission mechanism 3, the twin wheel caster 4, and the wheel lock mechanism 5 can be provided on the leg part 13, the supporting column part 12 of the existing bedside table is left as it is, and only the leg part is used. By exchanging, the caster of the existing bedside table can be easily modified to a configuration in which the caster can be firmly locked and unlocked.
Furthermore, the end operation part can be provided to protrude from the leg part of the bedside table, and it can be easily operated when fixing the twin wheel casters on the floor, and the lock state and release state of the twin wheel casters can be confirmed at a glance. it can. In addition, since the upper end flat portion 1351 of the storage frame body 135 of the leg portion 13 is provided facing upward, the end operation portion 2 can be easily operated with a little bowing by a nurse or the like, and the two-wheel caster is locked. And safety can be confirmed at a glance at the release state.

In addition, since the handle portion 21 is lifted upward and protruded, unlike a normal pressing operation, the caster is not accidentally locked and released, and the pedal is raised as in the conventional case. The caster of the bedside table can be fixed and released by an operation that is not unreasonable. In addition, for safety reasons, the release button 23 of the release maintaining mechanism 22 must be operated, and the operation cover 24 is provided, so that a patient who is a user or an attendant may accidentally unlock the twin wheel caster. There will be no operation.
In addition, when the operation cover 24 covers the operation portion, the twin wheel caster is in a locked state, and the bedside table 1 can be disposed in the vicinity of the bed with peace of mind, and the twin wheel caster is released. In a dangerous state, since the handle portion 21 is in a protruding state, the released state of the twin-wheel caster 4 can be confirmed at a glance even if it is away from the bedside table 1, and the bedside table is in an unstable state in which it can move. That can alert you.
Further, in addition to the handle as the danger display, the release button is a release display button for displaying the release state of the caster, thereby providing a double danger prevention display.

  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, the wheels of all four wheel casters disposed on the bottom surface of the bedside table are used. Although the rotation was simultaneously locked and released by one operation unit, depending on the width of the two wheels of the caster, if it is more than one, the bedside table can be locked by rotating the wheels of two or three twin wheels. May be completely fixed, and if it can be fixed completely, two or three wheel rotation locks may be used in one or more twin wheel casters.

D ·· Bed 1 ·· Bedside table 11 ·· Table part
··· Column, 121 ·· Height adjustment lever, 122 ·· Table support,
123 ・ ・ Basics
13 ・ ・ Leg part, 131 ・ ・ Staff fixing member,
132,133 ・ ・ Frames with casters (mounting frames), 134 ・ ・ Linked frames
135 ・ ・ Storage frame, 1351 ・ ・ Upper flat part,
2 .. Terminal operation part,
21 ・ ・ Handle part, 211 ・ ・ Rotating shaft, 212 ・ ・ Rotating body part,
213 ・ ・ Convex part, 214 ・ ・ Locking part,
215 ・ ・ Terminal part introduction groove, 216 ・ ・ Rotating side part, 2161 ・ ・ Tension spring,
2162 ... Shock absorber,
217 ·· Holding part, 218 ·· Locking member locking hole, 219 ·· Upper end surface,
22 .. Release maintenance mechanism, 221 .. Lock member, 2211 .. Tip,
2212 ·· Rear end, 222 · · Spring member, 223 · · Pin,
23..Release button, 231 ... Lower prism, 2311 ... Two crotch,
232 ・ ・ Cam slot, 233 ・ ・ Upper operation part,
24 ・ ・ Operation part cover, 241 ・ ・ Right side plate, 2411, 2421 ・ ・ Mating protrusion,
2422 ・ ・ Stopper engaging part, 242 ・ ・ Left side plate,
243 ... Upper plate 2431 ... Notch, 244 ... Back plate, 2441, 2442 ... Back plate member,
25 ·· Frame, 251 · · Body storage, 252 · · Groove, 253 · · Guide wall,
254 ... Sliding hole, 255 ... Spring storage, 256 ... Release button sliding hole,
257 ·· Step, 26, 27 · · Outer frame, 261, 271 ·· Step, 272 · · Stopper projection,
3. Operation transmission mechanism, 31 Operation wire
311, 316, 331, 336 ... Terminal, 312, 332 ... Inner wire,
313,333 ・ ・ Coating part (outer wire),
314, 315, 334, 335 ..Mounting fixing part,
32 ・ ・ Wire branch board, 321 ・ ・ Lid, 3211 ・ ・ Guide groove, 3212 ・ ・ Fixed convex part,
322 ・ ・ Slider, 3221, 3222 ・ ・ Fitting part, 3223 ・ ・ Mountain part,
323, 324 ·· Side plate, 33 (33a, 33b, 33c, 33d) · · Branch wire 4, 4a, 4a ', 4b, 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, 515 · · Lower spring engagement part,
516 ... Guide groove,
518 ・ ・ Fixed gear, 5181 ・ ・ Tooth, 5182 ・ ・ Center hole,
52 .. Rotation support part, 521 .. Fixed support cylinder member, 522 .. Mounting edge part,
523 ・ ・ Swivel auxiliary washer, 523 ・ ・ Stopper (fixed snap ring),
524 ・ ・ 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
546 ・ ・ Turning prevention teeth, 5461 ・ ・ Forked teeth, 5462 ・ ・ Horizontal base, 547 ・ ・ Pressure spring,
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 (9)

A bedside table fixing device provided with a terminal operation part for operating a plurality of twin wheel casters of a bedside table in a locked state and an unlocked state in one place,
The double wheel caster is provided with a wheel lock mechanism, and a coaxial wire is connected between the wheel lock mechanism and the end operation unit to transmit the operation of the end operation unit to the wheel lock mechanism, thereby locking the double wheel caster. A bedside table fixing device that operates a state and an unlocked state.   The bottom part of the leg part of the bedside table is composed of an insertion part inserted into a space under the bed and a support part provided on the support part of the bedside table arranged outside the bed, at both ends of each part. 2. The bedside table fixing device according to claim 1, wherein a twin-wheel caster is disposed, and the double-wheel caster provided at the support portion is provided with a wheel lock mechanism and a turning lock mechanism.   The bedside table fixing device according to claim 1 or 2, wherein the turning lock mechanism is operated simultaneously in cooperation with the wheel lock mechanism.   The bedside table fixing device according to any one of claims 1 to 3, wherein all the twin-wheel casters of the bedside table are simultaneously brought into a wheel lock state and a wheel release state by the steering end working unit. .   The wheel lock mechanism is provided with a knock member that moves up and down, the upper tip portion of the knock member protrudes from the lock mechanism frame, and the lower tip portion is interlocked with the wheel tooth engagement lock portion and is in contact with the upper tip portion. The bedside table fixing device according to any one of claims 1 to 4, wherein a slider cam member having a cam surface is provided, and the knock member moves up and down along the cam surface.   The wire is connected to the four wheel lock mechanisms by branching one operation wire from the terminal operation section into four branch wires, and the forward and backward movement of the one operation wire by the inner wire is performed. The bedside table fixing device according to any one of claims 4 to 5, wherein the bedside table fixing device transmits the advance and retreat movement of the four branch wires by an inner wire.   In the middle of the one operation wire and the four branch wires, a wire branch mechanism that connects to the terminal portions of both wires is provided, and in the branch mechanism, a slider that fixes the four terminal portions in parallel is provided. The bedside table fixing device according to any one of claims 4 to 6, wherein the branching mechanism is flattened, and parallel movement means for moving the slider in parallel with the advancing / retreating movement direction of the inner wire is provided. .   The bedside table fixing device according to any one of claims 1 to 7, wherein the end operation part is provided on a leg part of the bedside table.   The bottom surface of the leg portion of the bedside table is substantially square-shaped, and the height from the top surface of the insertion portion to the floor is lower than the height from the top surface of the support column support portion to the floor. The bedside table fixing device according to any one of claims 1 to 8.

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