JP2016073383A - Leg part lock mechanism of movable table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leg part lock mechanism of a movable table, in which a caster can be operated in a lock state and an unlock state without providing an operation wire directly in the caster, and operability of lock operation/unlock operation can be improved by configuring a lock mechanism of the caster so as to facilitate the lock state during non-operation.SOLUTION: A leg part lock mechanism of a movable table comprises a caster lock mechanism for locking or unlocking a wheel of a caster by actuating a lock member with an operation arm. The operation arm swings with a leg part as a fulcrum, and a point of action of the operation arm, which actuates the lock member of the operation arm, is provided on a force point side from the fulcrum. An operation wire is connected to the force point of the operation arm from an operation part. An operation force of the operation part is transmitted to the point of action through the operation wire to actuate the lock member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mobile table, and more particularly to a leg lock mechanism for a mobile table in a bedside table, an overbed table, or the like.

  Conventionally, some mobile tables are used near a bed. For example, a bedside table that is moved from one side of the bedside in the width direction of the bed and placed at a predetermined position, or a bedside table that is moved from the foot side of the bed in the longitudinal direction of the bed and placed at a predetermined position. There is an overbed table. As this type of mobile table, one having a lock operation mechanism for preventing the caster from moving when the user uses the table is known.

  The lock mechanism of the mobile table is designed to transmit the operating force of one control lever to the lock mechanisms of all four casters via wires and links so that the four casters can be locked and unlocked simultaneously. (See Patent Document 1).

  The lock mechanism disclosed in Patent Document 1 is a mechanism that locks / unlocks when a plate-like engaging portion is engaged / disengaged with an internal gear-like engaged portion of a wheel of a caster. Yes, it is necessary to extend the operation wire near the caster.

  On the other hand, there is one that can be operated by an operating arm without having to extend the operating wire near the caster.

  As another example of the lock mechanism provided on the wheel of the caster of the mobile table, an operating pin protrudes in the same direction as the caster mounting shaft to the leg, and when the operating pin is pushed from above, the caster There is a mechanism that locks the wheels of the vehicle (see Patent Document 2).

  In Patent Document 2, the operation pin of the lock mechanism is configured to be biased upward by a spring. The operating force of the operating lever for table installation is transmitted to the operating arm for leg installation via an operation wire. The operating arm has a power point located above the operating pin across the fulcrum provided on the leg, and the operating wire is connected to the operating point, and when the operating point is moved by the operating wire, the power point moves up the operating pin. It is the structure of the structure which is operably installed in a leg part so that the wheel of a caster may be operated and locked.

JP 2007-131239 A Japanese Patent No. 5327887

  However, in the technique of Patent Document 2, the lock mechanism of the caster is in an unlocked state without being operated, and in order to enter the locked state, a lock operation for pulling up the operation arm is required, and the lock state is set when not being operated. The structure is not assumed.

  The present invention has been made in view of the above-described conventional problems. The caster can be operated in a locked state / unlocked state without providing an operation wire directly on the caster, and a caster lock mechanism can be provided when the caster is not operated. It is an object of the present invention to provide a leg lock mechanism for a mobile table that can be easily locked to improve the operability of the lock operation / unlock operation.

The present invention has a table part, a support part that supports the table part, and a leg part provided at a base part of the support part, and is movable by a caster provided on the leg part.
It has a caster lock mechanism that locks or unlocks a caster wheel by operating a lock member with an operation arm,
The operation arm swings with a fulcrum at the leg, and an action point for operating the lock member of the operation arm is provided on the force point side of the fulcrum,
An operation wire is connected to the force point of the operation arm from the operation unit, and the operation force of the operation unit is transmitted to the action point via the operation wire to operate the lock member. It is the leg part locking mechanism of the mobile table which performs.

  In the present invention, when the operation unit is not operated, the lock member locks the caster wheel, and when the operation unit is operated, the lock member locks the caster wheel. Is preferred.

  In the present invention, it is preferable that the operation arm is configured to lock a wheel of a caster by an urging force of an elastic body.

  In the present invention, it is preferable that the leg is provided with casters at both ends in the length direction, and each caster is provided with an operation arm, and the operating points of the operation arms are combined and operated by an operation wire. It is.

  In the present invention, it is preferable that the operating shaft of the lock member is provided in each caster so as to be able to advance and retract, and the operating point is located on the operating shaft.

  In the present invention, the mobile table is preferably an overbed table capable of positioning the table portion above the bed.

  According to the leg lock mechanism of the mobile table of the present invention, the operation arm of the caster lock mechanism swings with the fulcrum at the leg, and the operating point for operating the lock member of the operation arm is the fulcrum. The operation member is connected to the force point of the operation arm from the operation unit, and the operation force of the operation unit is transmitted to the action point via the operation arm to lock the lock member. Is activated.

  Therefore, the caster can be operated in a locked state / unlocked state without providing an operation wire directly on the caster, and when the operating arm is lowered around the fulcrum, the force point is lowered and the lock member locks the caster wheel. Can be configured.

  In addition, if the operation arm is configured so that it can be locked down, the operation arm will apply its downward force due to its own weight, making it easier to lower the operation arm compared to pulling up the operation arm. Easy to put into condition. In particular, if an elastic body such as a spring is used to apply a downward force to the force point of the operating arm, the caster will be locked when the operating unit is not operated, and even if the table is pushed unintentionally It is possible to obtain excellent effects such as preventing the table from moving.

It is a perspective explanatory view showing the whole configuration of the mobile table according to the embodiment of the present invention. It is explanatory drawing seen from the front which shows the whole structure of the said mobile table. It is explanatory drawing which looked at the said movable table side, and shows the state which the support | pillar part shortened. It is explanatory drawing which looked at the said movable table side, and shows the state which the support | pillar part extended. It is an enlarged view of the column connection part periphery of the said movable table, (a) shows the state which extended the support | pillar part, (b) shows the state which folded the support | pillar part. It is explanatory drawing which shows the caster structure with a lock | rock of the said movable table, (a) is a side view of a leg part, (b) is an enlarged view of a caster periphery. It is explanatory drawing of the internal structure of a table part, and a lock release mechanism.

  Hereinafter, embodiments of the mobile table of the present invention will be described in detail with reference to the drawings.

  1 to 4 are explanatory views showing the entire configuration of the mobile table according to the embodiment of the present invention, FIG. 5 is an enlarged view of the periphery of the column connecting portion, FIG. 6 is an explanatory view of a caster structure with a lock, and FIG. It is explanatory drawing which shows the lock release mechanism periphery of a part.

  The mobile table 1 according to the present embodiment is an overbed table, and as shown in FIGS. 1 to 3, a table unit 10 having an elongated table plate and a column unit 20 that supports both end portions of the table unit 10. , Which are provided on the base side of the support column 20 and can be moved by a leg 30 that is long in the width direction of the table 10 and casters 31 that are provided at both ends of the length of the leg 30 (the width of the table) It is.

  The caster lock mechanism 32 always locks (rotates) the wheels of the caster 31 in the mobile table 1. The caster lock mechanism 32 operates a lock member (in the embodiment, a brake shoe) by operating an operation arm 324 through an operation wire 41 by an operation of an unlocking mechanism 40 provided on the table unit 10 as shown in FIG. ) 321 can be pressed / released against the wheel of the caster 31 to change the lock / unlock state of the caster 31.

  First, the structure of each part of the mobile table 1 of this embodiment is demonstrated with reference to drawings.

As shown in FIGS. 1 and 2, the table portion 10 is formed in an elongated rectangular shape so that it can be placed across the bed device over the width direction of the bed device (not shown).
The table unit 10 includes an upper surface 101 and a lower surface 102.

  The support columns 20 are arranged at both ends in the longitudinal direction of the lower surface 102 of the table portion 10 so as to extend downward, and the entire shape of the movable table 1 is formed in a gate shape in a front view of FIG. A leg portion 30 having casters 31 is provided at a base portion (lower end portion) of the column portion 20.

  As shown in FIG. 2, a table reinforcing member 103 is provided below the lower surface 102 along the longitudinal direction. The table reinforcing member 103 is configured such that the support column 20 can be folded.

As shown in FIGS. 1 and 3, a lock release mechanism 40 is provided at one end of the table portion 10 in the width direction. As shown in FIGS. 1 and 2, an operation wire 41 that can be bent and stretched and constitutes a part of the unlocking mechanism 40 is laid between the table portion 10 and the table reinforcing member 103.
In the mobile table, the operation wire 41 is accommodated inside the table reinforcing portion 103 and inside the column portion.

  The support | pillar part 20 is comprised so that expansion-contraction is possible, as shown in FIG. 3, FIG. FIG. 3 shows a shortened state and FIG. 4 shows an extended state.

  Each of the support columns 20 has a hollow cylindrical first support member 201 and a second support member 202, and the first support member 201 is externally covered with the second support member 202. And the support | pillar part 20 is comprised so that the 2nd support | pillar member 202 may move along the 1st support | pillar member 201 in the up-down direction in the figure.

  The first support member 201 is provided to extend upward from the center in the length direction of the leg portion 30, and the second support member 202 is provided to extend downward to the lower portion of the table portion 10. However, the height of the table unit 10 can be adjusted by the operation of pushing the table unit 10 up and down.

  An extension guide structure 21 that guides an operation wire 41 disposed inside the support column 20 is configured inside the support column 20 in response to the operation of the extension of the support column 20.

  The telescopic guide structure 21 includes a first guide member 211 and a second guide member 212, and moves the second guide member 212 in the vertical direction in the drawing along the first guide member 211 within a range in which the support column 20 extends and contracts. It is configured to expand and contract.

  The first guide member 211 is provided on the first column member 201 side, and the second guide member 212 is provided on the second column member 202 side. The second guide member 212 is disposed such that the operation wire 41 can be easily moved therein, and the first guide member 211 is disposed such that the second guide member 212 and the operation wire 41 can be easily moved therein. Thus, the guide wire 20 is configured to be guided so as not to be bent even when the length of the operation wire 41 disposed inside the support column 20 changes due to the expansion and contraction of the support column 20.

  Moreover, the support | pillar part 20 is comprised so that folding is possible so that the table reinforcement member 103 periphery may be shown to Fig.5 (a), (b). Specifically, the second support column member 202 is foldably supported by the table reinforcing member 103 provided on the lower surface 102 of the table unit 10. FIG. 5A shows a usage state of the table on which the support column 20 rises, and FIG. 5B shows a non-use state of the table in which the support column 20 is folded.

  The second support member 202 is integrally provided with a support connecting portion 203 attached to the table reinforcing member 103.

  As shown in FIGS. 5A and 5B, the support column connecting portion 203 includes a rotation support portion 203a, a fixing portion 203b, and a fixing portion 203c.

  The column connection part 203 is pivotally supported by the table reinforcing member 103 so that the column support part 203 can rotate with the rotation support unit 203 a as a fulcrum.

  The rotation support portion 203 a functions as a fulcrum for rotating the support column connection portion 203 when the support column portion 20 is folded, and supports the support connection portion 203 along the elongated hole-shaped guide hole 103 a formed in the table reinforcing member 103. Guide the rotation of The rotation support portion 203a is engaged with the guide hole 103a by a support member (not shown) when the table is used.

  The fixing portion 203c is fixed to a mounting hole 103c formed in the table reinforcing member 103 by a fastening member (not shown) when the table is used.

  Thus, when using the movable table 1 by the support | pillar connection part 203, as shown to Fig.5 (a), the 2nd support | pillar member 202 is reliably fixed by the fastening member with respect to the table reinforcement member 103 at three places. Can be fixed to. On the other hand, when the mobile table 1 is not used, as shown in FIG. 5B, the second support member 202 can be easily folded by simply removing the fastening member, and can be stored compactly.

  As shown in FIG. 6, the leg 30 includes a caster 31, a caster lock mechanism 32 that locks / unlocks the rotation of the caster 31, and a leg frame 33 to which the caster 31 and the caster lock mechanism 32 are attached. It is prepared for.

  In the embodiment, as shown in FIG. 6, the caster lock mechanism 32 operates a lock member 321 such as a brake shoe by an operation arm 324 to lock or unlock the wheels of the caster 31.

  In this case, the operating arm 324 swings on the leg 30 with the one end 324a as a fulcrum, and the stopper 324d serving as an action point for operating the lock member 321 of the operating arm 324 is more than the fulcrum one end 324a. Is also provided on the other end 324b side which is the power point.

  An operation wire 41 is connected to a power point of the operation arm 324 from an operation unit (operation lever 44 of the lock release mechanism 40) for a user to perform unlocking operation, and the operation force of the operation unit is transmitted via the operation wire 41. Thus, the lock member 321 is actuated by transmitting it to the action point.

  In the embodiment, when the operation unit is not operated, the lock member 321 is used to lock the wheels of the casters 31. On the other hand, when the operation unit is operated, the lock members 321 unlock the wheels of the casters 31. It is to make. That is, the caster 31 is in a locked state without operating the operation unit, and the movement of the mobile table 1 is restricted.

  The operation arm 324 has a structure in which the wheels of the casters 31 are locked by the urging force of the elastic body (coil spring 327).

  Further, the leg 30 is provided with casters 31 at both ends in the length direction, and each caster 31 is provided with an operation arm 324, and the operation wire merging the power points (the other end 324b) of the operation arms 324 together. 41 is operated.

  Each caster 31 is provided with an operating shaft (locking member support shaft 322) of a locking member 321 so as to be capable of moving forward and backward, and an operating point (stopper portion 324d) is positioned on the operating shaft.

  Specifically, as shown in FIG. 6A, the leg frame 33 is a rigid body that is formed long along the width direction of the table portion 10, and casters 31 are attached to both ends thereof. ing.

  As shown in detail in FIG. 6B, the caster 31 is pivotally supported around a mounting shaft 311 with respect to a mounting bracket 331 mounted on the end of the leg frame 33. A lock member support shaft is coaxially mounted in the hollow shaft of the attachment shaft 311, and the lock member support shaft 322 that supports the lock member 321 coaxially with the attachment shaft 311 is movable in the axial direction of the attachment shaft 311. Installed on.

  As shown in FIG. 6B, the lock member support shaft 322 is urged by a coil spring 323 in a direction in which the lock member 321 is separated from the caster 31 (upward direction in the drawing). The lock member 321 is made of an elastic material having a high resistivity, such as an elastomer, and has a structure in which the caster 31 is pressed against the wheel outer peripheral surface of the caster 31 from above to stop and lock the caster 31.

  The lock member 321 is driven and operated by an operation arm 324 constituting the caster lock mechanism 32. Then, the position of the lock member 321 is set by the lock member support shaft 322 coming into contact with a stopper portion 324 d protruding from the operation arm 324.

  The operation arm 324 has one end portion 324a pivotally supported by a support portion 331a provided on the outer side of the mounting position of the caster 31 of the mounting bracket 331 by a support shaft 325, and the other end portion 324b by a connecting pin 326. It is connected to the inner wire 411. An elongated hole-shaped guide hole 324c for guiding the movement of the connecting pin 326 is formed in the other end portion 324b.

  A pair of operation arms 324 is provided corresponding to the casters 31 at both ends of the leg frame 33, and one end 324 a of the operation arm 324 is located at both ends of the leg frame 33, and the other from there to the center. It arrange | positions so that the edge part 324b may be crossed.

  The operation arm 324 has a structure that is operated so that the other end portion 324b rotates in the vertical direction about the support shaft 325 as the inner wire 411 moves forward and backward.

  When the other end portion 324b of the operation arm 324 is rotated upward by the pulling force of the inner wire 411, the stopper portion 324d is shifted upward. As a result, the lock member 321 provided on the lock member support shaft 322 moves upwardly away from the caster 31 by the spring force of the coil spring 323, that is, in a direction to release the lock of the caster 31.

  On the other hand, when the other end portion 324b loses the pulling force of the inner wire 411, it is rotated downward by the spring force of the coil spring 327, and the stopper portion 324d is shifted downward. As a result, the lock member 321 moves against the spring force of the coil spring 323 in the direction in which the lock member 321 contacts the caster 31 downward, that is, the direction in which the caster 31 is locked.

  In this configuration, in the operation arm 324, the moment of the operation arm 324 due to the elastic force of the coil spring 327 provided at the other end 324 b is larger than the moment of the coil spring 323 of the lock member support shaft 322.

  That is, since the force point (the other end 324b) is longer than the operating point (the stopper 324d) from the fulcrum (one end 324a) of the operation arm, the elastic force of the coil spring 327 is smaller than the coil spring 323. In other words, the operation force of the operation lever can be smaller than directly operating the lock member 321 and the lock can be locked with a light force, so that the lock can be released with a light force.

  The operation arms 324 are provided in pairs corresponding to the casters 31 at both ends of the leg frame 33. The other end 324b of the operation arm 324 for one caster 31 arranged at one end of the leg frame 33, and the other end 324b of the operation arm 324 for another caster 31 arranged at the other end, In the central part of the leg frame 33, the leg frame 33 is connected by a connecting pin 326.

  With this configuration, the caster lock mechanisms 32 at both ends of the operation arm 324 can be operated simultaneously by operating the inner wire 411 connected to the connection pin 326.

  Next, a characteristic configuration of the lock release mechanism 40 of the present embodiment will be described with reference to the drawings.

  FIG. 7 is an explanatory diagram showing the overall configuration of the unlocking mechanism 40 of the mobile table 1 of the present embodiment.

  As shown in FIG. 7, the lock release mechanism 40 includes an operation wire 41, a wire lever 42, an operation shaft 43, an operation lever 44, and a stop button 45.

  The operation wire 41 includes an operating inner wire 411 and an outer wire 412, and is connected to the caster lock mechanism 32 of the wire lever 42 and the caster 31 to perform a lock / unlock operation.

  As shown in FIG. 7, one end of the operation wire 41 is attached to the wire lever 42. As shown in FIG. 2, the operation wire 41 is laid from the table 10 side to the leg 30 side through the inside of the column 20. As shown in FIG. 6, the other end is attached to the operation arm 324 by a connecting pin 326 of a caster lock mechanism 32 of a caster 31 of a leg 30.

  As shown in FIG. 7, the operation wire 41 has an internal space of the table reinforcing member 103 of the table portion 10 so that the caster lock mechanism 32 of the caster 31 can be locked / unlocked within a range in which the column portion 20 extends and contracts. It is laid in a curved manner so as to have a margin in the inside.

  Specifically, as shown in FIG. 7, the operation wire 41 has a table reinforcement in a state where one end of the inner wire 411 is attached to the wire lever 42 and one end of the outer wire 412 is attached near the center of the table reinforcement member 103. In the vicinity of the center of the member 103, it is curved in a circular arc shape so as to have a margin, and is routed from the side end portion of the table reinforcing member 103 to the leg portion 30 through the inside of the column portion 20 via a wire guide (not shown). As shown, the other end portion of the inner wire 411 is attached to the caster lock mechanism 32 of the caster 31, and the other end portion of the outer wire 412 is attached to a part of the leg portion 30 near the caster lock mechanism 32.

  The wire guide portion 48 is formed of a curved cylindrical body, and is configured to guide the bending R so that it does not become extremely small when the operation wire 41 changes due to the expansion and contraction of the support column portion 20.

  The operation wire 41 is laid in the same manner from the two support columns 20 to the legs 30 provided on both sides of the table unit 10.

  As shown in FIG. 7, the wire lever 42 is disposed near the center of the table reinforcing member 103 at the lower portion of the table portion 10, and one end portion of the inner wire 411 is connected and operated, whereby the other end portion of the inner wire 411 is operated. Is a lever that simultaneously operates the caster lock mechanisms 32 of the casters 31 of the leg portions 30 arranged at two positions on both ends of the movable table 1 to which are connected.

  As shown in FIG. 2, the operation shaft 43 is provided long along the longitudinal side end portion of the table reinforcing member 103 and is rotatably attached to the table reinforcing member 103. A wire lever 42 is integrally provided in the vicinity of the central portion of the operation shaft 43 in the longitudinal direction, and the wire lever 42 is integrally rotated with the rotation of the operation shaft 43.

  As shown in FIG. 7, the operation lever 44 is a substantially L-shaped lever portion with one end projecting outward, and the other end is provided integrally with the operation shaft 43. Rotate. In the present embodiment, the operation lever 44 is provided at both ends of the operation shaft.

  The stop button 45 functions as an unlocking holding member that holds the unlocked state of the caster locking mechanism 32 of the caster 31 by the unlocking mechanism 40. Specifically, as shown in FIG. 2, the stop button 45 operates the operation lever 44 and the wire lever 42 operates the operation wire 41, that is, the caster lock mechanism 32 of the caster 31 is unlocked. It is comprised so that the kept state may be hold | maintained. The stop button 45 is normally urged by an elastic body (not shown) so as to protrude to the outside of the cover member.

  The present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention. For example, the lock member may have a structure that locks the caster shaft in addition to a member that slides the brake shoe against the caster. Moreover, although the support | pillar part coat | covered the 2nd support | pillar member on the 1st support | pillar member, it can comprise variously, such as inserting and comprising three or more support | pillar members.

  The leg lock mechanism of the mobile table of the present invention can be used not only as a mobile table used in a bed but also as a leg lock mechanism of an office mobile table.

DESCRIPTION OF SYMBOLS 1 Mobile table 10 Table part 20 Strut part 21 Telescopic guide structure 30 Leg part 31 Caster 32 Caster lock mechanism 33 Leg part frame 40 Unlocking mechanism 41 Operation wire 201 1st strut member 202 2nd strut member 203 Strut connection part 311 attachment Shaft 321 Lock member 322 Lock member support shaft 324 Operation arm 324a Operation arm one end 324b Operation arm other end 324c Guide hole 324d Stopper 325 Support shaft 326 Connecting pin 331 Bracket 331a Bracket support

Claims (6)

In a movable table having a table part, a support part supporting the table part, and a leg part provided at a base part of the support part, and movable by a caster provided in the leg part,
It has a caster lock mechanism that locks or unlocks a caster wheel by operating a lock member with an operation arm,
The operation arm swings with a fulcrum at the leg, and an action point for operating the lock member of the operation arm is provided on the force point side of the fulcrum,
An operation wire is connected to the force point of the operation arm from the operation unit, and the operation force of the operation unit is transmitted to the action point via the operation wire to operate the lock member. Mobile table leg lock mechanism.   When the operation unit is not operated, the lock member locks the wheels of the caster. On the other hand, when the operation unit is operated, the lock member sets the caster wheels to an unlocked state. The leg locking mechanism of the mobile table according to claim 1.   The leg lock mechanism of the mobile table according to claim 1 or 2, wherein the operation arm is configured to lock a wheel of a caster by an urging force of an elastic body.   The leg is provided with casters at both ends in the length direction, and each caster is provided with an operation arm, and the force points of these operation arms are combined and actuated by an operation wire. The leg part locking mechanism of the movable table in any one of 1-3.   The movable table according to any one of claims 1 to 3, wherein an operating shaft of a lock member is provided on each caster so as to be movable back and forth, and an operating point is positioned on the operating shaft. Leg lock mechanism.   The leg lock mechanism for a mobile table according to any one of claims 1 to 5, wherein the mobile table is an overbed table capable of positioning the table portion above the bed.

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