JP2009279062A - Elevating/lowering table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow an elevating/lowering mechanism to begin its unlocking operation only by double operations. <P>SOLUTION: The elevating/lowering table capable of adjusting a table height and having a locking mechanism for fixing it at an optional position includes: a lever lock pin 6 which is freely removed and inserted in a direction crossing the direction of the swing rotation of an operation lever 2 and blocks the turning in an unlocking direction of the operation lever 2 when inserted into a range abutting on the operation lever 2 when the operation lever 2 is turned from a locking position to an unlocking position; and a return spring 15 which urges the lever lock pin 6 so as to be inserted to the range abutting on the operation lever 2 at all times. The operation lever 2 cannot be operated in the unlocking direction unless the lever lock pin 6 is moved to a withdrawn position against the spring force of the return spring 15, and when the operation lever 2 is moved to the locking position, the lever lock pin 6 is automatically returned and inserted to the range abutting on the operation lever 2 by the return spring 15, and the turning of the operation lever 2 is locked. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lifting table that can freely adjust the height of a table by a lifting mechanism that can be fixed at an arbitrary position. More specifically, the present invention relates to an improvement of an operation lever that releases a fixing mechanism of an elevating mechanism.

  As an elevating table, a table main body placed thereon is opened and closed by opening and closing a support leg called an X leg in which a pair of legs are crossed in an X shape and the crossing portion is rotatably connected around a horizontal axis. There are known ones that are moved up and down (Patent Document 1) and ones that incorporate a gas spring with a lock mechanism into a column so that the column itself expands and contracts in the vertical direction.

  This type of lifting mechanism employs an actuator that assists the lifting and lowering of the leg, such as a gas spring with a lock mechanism, so that the height can be adjusted steplessly, and its expansion and contraction amount is fixed at an arbitrary position. What is possible is common. Of course, it has a lock mechanism that can be switched between the released state and the locked state by lever operation separately from the actuator such as a gas spring that assists the lifting and lowering operation of the leg, and it is separated from the movement of the actuator and can be It may be adjustable.

Shoko 57-48431

  However, unlike the lock mechanism that locks the table height step by step by engaging the concaves and convexes, in the case of a lock mechanism such as a gas spring with a lock mechanism that can set the lift position of the table steplessly, If the operating lever is operated by mistake, the table body may move up and down all at once. In particular, when a heavy object is placed on the table body, if the user accidentally operates the operating lever without supporting the table body, a load is applied and the table body falls suddenly. As a result, there is a risk that luggage on the table may fall or fall. In addition, this type of table may be used by children for play instead of play equipment. And if the child accidentally touches the control lever while riding on the table, the table body suddenly descends and is thrown out unexpectedly, or the child enters and plays under the table body. If you put your hand in the area, there is a risk of a larger accident.

  On the other hand, in order to facilitate the handling of the operation lever during the lifting operation, it is desirable that the operation lever be disposed near the edge of the table. Thereby, it is not necessary to dive under the table for the lifting operation, and the handling of the operation lever becomes very easy, but on the other hand, it includes a surface that is easily operated by mistake. For example, when working near the table or standing near the table, clothes or the like may be caught by the operation lever and the lock may be released unexpectedly.

  Therefore, the present invention has an object to provide an elevating table capable of executing the unlocking operation of the elevating mechanism only after a double operation, that is, an elevating table capable of performing the unlocking operation only when there is a clear intention to unlock. And

  In order to achieve such an object, the present invention provides a table, a leg portion that supports the table so as to be movable up and down, a lock mechanism that fixes the height of the table at an arbitrary position, and a release state and a lock state of the lock mechanism. When the operation lever is rotated from the lock position to the unlock position in a lifting table having an operation lever that can be switched by a swing rotation operation so that it can be inserted and removed in a direction intersecting the swing rotation direction of the operation lever. A lever lock pin that prevents the operation lever from rotating in the unlocking direction when it is inserted into the contact area with the operation lever, and a return that urges the lever lock pin to be always inserted into the contact area with the operation lever. If the lever lock pin is not moved to the retracted position against the spring force of the return spring, the operating lever will operate in the unlocking direction. Scratches, and the operating lever is in the lock is applied as the rotation of the operation lever lever lock pin to the operating lever abutting the range by the return spring is inserted automatically reset when moved to the locked position.

  Here, the lifting table of the present invention is applied to a lifting table provided with a gaspring with a lock mechanism as an actuator for assisting the lifting operation of the legs, and blocks the oil flow of the gaspring with a lock mechanism. It is preferable that the pedal for pushing the pin for controlling the opening / closing operation of the valve into the rod is controlled by the rotation of the operation lever via the control cable.

  The operation lever has a baffle plate that abuts the tip of the lever lock pin when the operation lever is in the unlocked position and prevents the lever lock pin from being inserted into the swing rotation locus of the operation lever. It is preferable to provide.

  Further, the operation lever includes an operation rod for operating lever lock that is rotatably supported by a housing fixed to the back surface of the table and is disposed coaxially with the rotation center of the operation lever through the housing. The return spring is arranged between one end protruding from the casing of the operating rod and the casing, while the operating rod and the lever lock pin are arranged in parallel and connected to the other end protruding from the casing of the operating rod. A plate that can be moved at the same time is provided, and the lever lock pin is inserted into and removed from the operation lever by the axial movement of the operation rod, and the lever lock pin is returned to the original position by the spring force of the return spring. It is preferable to insert it in a range where it comes into contact with the operation lever.

  According to the lifting table of the first aspect of the invention, the rotation operation of the operation lever is not performed until the lever lock pin inserted in the range in contact with the operation lever is removed and the engagement with the operation lever is released. So that unlocking operation is not performed by mistake. In addition, when the operating lever is opened or returned to its original position to lock the lifting mechanism, the lever lock pin is automatically returned by the force of the return spring and inserted into the range where it abuts the operating lever. The lock mechanism can be shifted to the locked state. For this reason, unless the unlocking operation is intentionally performed, the elevating mechanism can always be kept locked.

  Further, according to the present invention, since there is no malfunction of the lock mechanism, the operation lever can be arranged on the back surface of the table along the edge of the table, and the unlocking operation at the time of raising and lowering the table has touched the edge of the table. Easy to do in the state.

  Further, according to the second aspect of the present invention, the pin for controlling the opening / closing operation of the valve for assisting the lifting / lowering operation of the leg portion with the moth spring with the lock mechanism and blocking the oil flow of the moth spring with the lock mechanism is provided in the rod. Since the pedal to be pushed is controlled by the rotation of the operation lever via the control cable, the spring force of the gas spring acts simultaneously with the unlocking of the lock mechanism by the rotation of the operation lever, so the table can be moved up and down lightly. It will be a thing.

  According to a third aspect of the present invention, the operation lever includes a baffle plate that prevents the lever lock pin from being inserted in a range where the operation lever contacts the operation lever when the operation lever is in the unlocked position. Therefore, when the operating lever is swung in the unlocking direction, it is not necessary to keep pulling the lever lock pin against the force of the return spring, and the unlocking operation by the operating lever becomes easy.

  According to the fourth aspect of the invention, the lever lock pin can be inserted into and removed from the operation lever by the axial movement of the operation rod, and the operation rod is returned to the original position by the spring force of the return spring. Since the lever lock pin is inserted into the range where it comes into contact with the operation lever, the lever lock pin can be removed from the range where it comes into contact with the operation lever by a simple operation of pushing the operation rod with the palm of the hand, for example. In addition, it is possible to automatically return to the locked state when the operating lever returns to the locked position simply by releasing the pushed operating rod, and the operation becomes easier.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 to 4 show an embodiment of an unlocking mechanism for a lifting table according to the present invention. The lock release mechanism 1 of this embodiment is applied to a lifting table provided with a gaspring with a locking mechanism with a free piston that is not limited in the mounting posture as an actuator for assisting the lifting operation. A pin for controlling the opening / closing operation of the valve that cuts off the flow of the valve is operated through a control cable.

  The lock release mechanism 1 according to the present embodiment is attached to the back surface of the edge of the table main body, has a housing 3 fixed to the back surface of the table, and an operation lever for the table main body via the housing 3. 2 is supported so as to be swingable and rotatable, and can be freely inserted and removed in a direction crossing the direction of swinging rotation of the operation lever 2 so that the operation lever 2 is unlocked from the lock position (see FIG. 1A) (see FIG. 1 (C)), the lever lock pin 6 that prevents the operation lever 2 from rotating in the unlocking direction when the lever is inserted into a range in contact with the operation lever 2 and the lever lock pin 6 And a return spring 15 that is urged so as to be always inserted into a range in contact with the operation lever 2, and if the lever lock pin 6 is not moved to the retracted position against the spring force of the return spring 15, the operation lever 2 is b When the operation lever 2 cannot be operated in the release direction and the operation lever 2 is moved to the lock position, the lever lock pin 6 is automatically returned and inserted into the range where it comes into contact with the operation lever 2 by the return spring 15 to rotate the operation lever 2. Is provided to lock.

  The operation lever 2 has a cylindrical shaft support 4 that serves as a bearing (rotation center) during swinging rotation, and includes a wire receiver 8 that hooks the ball portion 10 of the control cable 9 on the front side, and a rear side. Is formed in a substantially hemispherical shape provided with a handle portion 2a on which a user's finger is hung. The operating lever 2 is rotatably supported by the housing by flanged bearing bushes 16 inserted from the outside of the side wall 3 a through the through holes of the side wall 3 a of the housing 3 at both ends of the cylindrical shaft support 4.

  Further, the side surface of the operation lever 2 on the side where the lever lock pin 6 is inserted is in a range where the operation lever 2 is in contact with the end of the lever lock pin 6 when the operation lever 2 is in the unlocked position. A baffle plate 7 is provided to prevent the lever lock pin 6 from being inserted. At the same time, the baffle plate 7 abuts on the upper part (top part) of the housing 3 when the operation lever 2 is erroneously rotated downward, thereby preventing further rotation of the operation lever 2. It acts to prevent the cable 9 from being pulled and erroneously operating the pin of the moth spring with the lock mechanism. The baffle plate 7 is integrally formed by, for example, raising a part of the side edge when the operation lever 2 is bent by press working or the like, but may be integrated by welding or the like depending on circumstances. In the present embodiment, the baffle plate 7 is substantially rectangular, but the shape is not particularly limited.

  An operation rod 5 for operating the lever lock pin 6 is passed through the side walls 3 a of the housing 3 and the cylindrical shaft support 4 of the operation lever 2. The operating rod 5 passes through a flanged bearing bush 16 inserted into the housing 3 and is disposed coaxially with the cylindrical shaft support 4 of the operating lever 2. A return spring 15 is disposed between one end of the operation rod 5 protruding from the housing 3 and the housing 3, while a lever lock pin 6 is provided on the other end of the operation rod 5 protruding from the housing 3. By fixing the supporting plate 17, the plate 17 is provided so as not to be detached from the cylindrical shaft support 4 and the housing 3. The plate 17 is brought into contact with the end face of the operation rod 5 slightly protruding from the flanged bearing bush 16 and is fastened with screws 18, and also serves to prevent the operation rod 5 and the flanged bearing bush 16 from being detached from the housing 3. It is provided as follows.

  A button 19 is provided at one end of the operating rod 5, and a return coil spring 15 is interposed between the button 19 and the housing 3, and the spring is compressed when the operating rod 5 is pushed into the cylindrical shaft support 4. A force is stored, and when the hand is released from the operating rod 5, an elastic force that can automatically return the operating rod 5 to its original position is always urged. In the case of the present embodiment, one end of the return spring 15 is brought into contact with the flange portion of the flanged bearing bush 16 inserted into the through-hole of the housing 3 to prevent the flanged bearing bush 16 from coming off the housing 3. It is provided to serve as both.

  On the other hand, a lever lock pin 6 that prevents the operation lever 2 from swinging is disposed on the plate 17 in parallel with the operation rod 5, in other words, in parallel with the rotation center axis of the operation lever 2. In the case of this embodiment, the lever lock pin 6 is configured by screws screwed to the plate 17. Of course, the lever lock pin 6, the plate 17, and the operation rod 5 may be integrated by previously forming one member. The housing 3 is provided with a hole through which the lever lock pin 6 passes, and the lock pin 6 protrudes inside the operation lever 2. Therefore, the lever lock pin 6 is operated to be inserted into and removed from the operation lever 2 by the axial movement of the operation rod 5, and the lever lock pin 6 is operated by returning the operation rod 5 to the original position by the spring force of the return spring 15. A movement for automatically returning to the range in contact with the lever 2 is given.

  The outer wall surface of the front wall 2b from which the control cable 9 of the operation lever 2 is pulled out has a circular cross section that prevents the control cable 9 from hitting the edge of the front wall 2b when the operation lever 2 is rotated and being kinked or damaged. A guide bar 11 is provided. The presence of the guide rod 11 prevents the control cable 9 from hitting the front wall 2b of the operation lever 2 or the edge of the wire receiver 8 when the operation lever 2 is rotated to the unlock position. . Further, the control cable 9 has the outer casing portion fixed to the housing 3 so that the screw cylinder 12 is inserted into the slit 14 provided in the front wall 3b of the housing 3 and the front wall 3b is sandwiched by the nut 13. ing. The other end portion of the control cable 9 is connected to a switching operation portion of the lock mechanism, for example, a pedal that pushes a pin of a gas spring with a lock mechanism as shown in FIG. 5 into the rod, and the operation lever rotates via the control cable. It is provided to rotate the pedal and push the pin.

  FIGS. 5 to 7 show an embodiment of an elevating table to which the elevating table unlocking mechanism configured as described above is applied. This lift table is synchronized with both legs of the X leg 21 and the X leg 21 on the back surface of the table body 20 and a gaspring 22 with a lock mechanism with a free piston for assisting its opening / closing operation (in other words, the lift operation). Thus, an elevating mechanism including a link mechanism 23 for transmission is provided. The X leg 21 can be opened and closed like a ridge by crossing a pair of leg bodies 21a and 21b in an X shape at the central portion thereof, and by connecting the crossing portion rotatably through a horizontal shaft 24. It is structured. The legs 21a and 21b in this embodiment are integrated so as to form a frame by connecting two ends of a pair of legs with horizontal bars 25a, 25b, 26a, and 26b arranged horizontally. In addition, the sliders 27 are provided on the horizontal bars 25a and 25b at the upper ends, and the wheels 28 that roll on the floor are provided on the horizontal bars 26a and 26b at the lower ends, and the sandwiching angle between the legs 21a and 21b. The table body 20 is configured to be raised and lowered by opening and closing to change the angle. The slider 27 is accommodated in four guide rails 29 screwed to the back surface of the table main body 20 so that the horizontal bars 25 a and 25 b at both upper ends of the X legs 21 can move horizontally with respect to the table main body 20. It is supported. The entire table facilitates horizontal movement on the floor and horizontal movement during the opening / closing operation of the legs by the rotation of the lower wheel 28.

  Further, a balance lever 31 is fixed to the center of the back surface of the table body 20 via a support plate 30 with a screw 32 so as to be rotatable about a vertical axis, and one rotation end side of the balance lever 31 is one leg 21a. The other pivot end side is connected to the horizontal bar 25b of the other leg 21b via links 33 and 34, respectively. One end of each of the links 33 and 34 is pivotally connected to the balance lever 31 with a pin, and this connection point is at a position facing the screw 32 that is the center of rotation of the balance lever 31 at the same distance. Has been placed. The other ends of the links 33 and 34 are connected to an annular bracket 35 provided on the horizontal bars 25a and 25b of the X leg 21 so as to be rotatable around a vertical axis via a pin shaft. Therefore, when the balance lever 31 is rotationally displaced, the horizontal bars 25a and 25b at the upper ends of both the X legs 21 slide simultaneously in the opposite direction by the same amount.

  A mounting portion of a gas spring 22 with a lock mechanism is connected to the balance lever 31 with a pin. On the other hand, the other end of the gas spring 22 with a lock mechanism is fixed to the operation box 36 fixed to the back surface of the table body 20 by using the screw of the attachment portion at the tip, and blocks the oil flow in the operation box 36. A pin 37 for controlling the opening / closing operation of the valve is fixed so as to protrude. A pedal 38 that abuts against and pushes the tip of the pin 37 is provided in the operation box 36 so as to be swingable, and is connected to the operation lever 2 via the control cable 9.

  According to the elevating table configured as described above, when adjusting the height of the table body 20, first, the operating rod 5 is pushed against the spring force of the return spring 15 with, for example, the palm, The lever lock pin 6 together with the operation rod 5 is pulled out from the range where it abuts on the operation lever 2. Next, by rotating the operation lever 2, the control cable 9 with the ball portion 10 hooked on the wire receiver 8 is pulled to swing and rotate the pedal 38 of the operation box 19, thereby opening and closing the valve of the gas spring 22 with a lock mechanism. The pin 37 is pushed in. As a result, the gas spring 22 is brought into a telescopic unlocking state, so that the balance lever 31 constrained by the gas spring 22 becomes rotatable and links 33, The leg bodies 21a and 21b connected via 34 can be freely opened and closed, and the table body 20 supported by the X legs 21 can be raised and lowered. Therefore, the table body 20 is raised and lowered to an arbitrary height with the assistance of the spring force caused by the gas pressure of the gas spring 22 (see FIGS. 6 and 7). At this time, in a state where the operation lever 2 is rotated and pulled up to the unlocking position (see FIG. 1C), even if the hand is released from the operation rod 5, the spring force of the return spring 15 restores the original force. Since the movement of the lever lock pin 6 and the operation rod 5 which are going to return to the position of the lever is restricted by the baffle plate 7, they are held at that position in a state where the urging force for returning is always urged. The Therefore, the lever lock pin 6 does not enter the range in contact with the operation lever 2 while the table body 20 is raised and lowered while the operation lever 2 is pulled up to the unlocking position. When the operation lever 2 is returned to the lock position, the baffle plate 7 rotates together with the operation lever 2 and passes through the front of the lever lock pin 6 to be retracted. With this force, the lever lock pin 6 enters the inside of the operation lever 2 and prevents the operation lever 2 from rotating toward the unlock position (see FIGS. 1A and 1B). Thereby, the operation lever 2 cannot be rotated in the unlocking direction unless the operation rod 5 is pushed again (removed from the operation lever 2). In other words, the locked state of the lifting mechanism is not accidentally released.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in this embodiment, the lever lock pin 6 that prevents the rotation of the operation lever 2 in the unlocking direction is supported by the operation rod 5 that penetrates the rotation center of the operation lever 2 via the plate 17, and the operation rod Although an example in which the lever lock pin 6 is provided so as to be inserted / removed with respect to the operation lever 2 by the axial movement of 5 has been mainly described, the present invention is not particularly limited thereto, and the lever is not provided with the operation rod 5. The lock pin 6 may be directly operated. That is, when the control lever 2 is inserted into a range in which the control lever 2 is rotatably supported in a direction that intersects the direction of swinging rotation of the control lever 2 and is inserted into a range where the control lever 2 contacts the control lever 2. The lever 3 is provided with a lever lock pin 6 that prevents the lever from rotating in the unlocking direction, and a return spring 15 that urges the lever lock pin 6 so as to be always inserted in a range in contact with the operation lever 2. It may be provided between the lock pin 6 and the lever lock pin 6 may be directly picked and moved to the retracted position against the spring force of the return spring 15.

  In addition, an example in which the upper end portion of the openable X leg 21 is applied to an elevating mechanism of an elevating table in which the upper end portion of the X leg 21 is slidably mounted in the open / close direction on the back surface of the table body 20 has been mainly described. Although not particularly limited to this, it is needless to say that the present invention can be applied to a locking mechanism of a single column type lifting table in which a gas spring that can be vertically expanded and contracted is arranged in a support column. The upper end of one leg is rotatably fixed to the back surface of the table body 20 and the upper end of the other leg is slidably connected to the back surface of the table body so that the other slidable leg and the table body are in between. It is also possible to apply it to the lifting mechanism of the lifting table configured to hold the table main body at the desired height position by inserting a gas spring that can be set steplessly It is.

  In addition, although an example in which the present invention is mainly applied to an elevating table provided with a gaspring 22 with a lock mechanism as an actuator for assisting the elevating operation of the legs has been described, the present invention is not limited to this, and a normal mechanism that does not have a lock mechanism. It is possible to apply to a lifting mechanism in which the actuator and the locking mechanism are completely separated, such as a gas spring and an independent locking mechanism, and a locking mechanism for a lifting table that does not include an assisting actuator. .

  Further, in this embodiment, the valve opening / closing pin 37 of the gas spring 22 with the lock mechanism is operated by the intervention of the control cable 9, but in some cases, the pin 37 is directly driven by the operation lever 2. May be.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows one Embodiment of the lock release lever for raising / lowering lock mechanisms of this invention, (A) is the lever position of a locked state, (B) is unlocking only an operation lever, without operating a lock release pin. (C) shows a state when the operation lever is rotated in the unlocking direction after operating the unlocking pin. It is a side view of the lock release lever for the lift lock mechanism. It is a bottom view of the lock release lever for the lift lock mechanism. It is IV-IV sectional drawing of the lock release lever for the raising / lowering lock mechanisms, and illustration of a control cable is abbreviate | omitted. It is a bottom view which shows one Embodiment of the raising / lowering table using the lock release lever for raising / lowering locking mechanisms of this invention. It is a front view of the raising / lowering table, and shows the highest state with a virtual line. It is a side view of the raising / lowering table, and shows the highest state with a virtual line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lock release mechanism 2 Operation lever 3 Case 4 Cylindrical shaft support part 5 Operation rod 6 Lever lock pin 7 Baffle plate 17 Plate which connects an operation rod and a lever lock pin 22 Gas spring with a lock mechanism

Claims (4)

The table body, legs that support the table body to be able to move up and down, a lock mechanism that fixes the height of the table body at an arbitrary position, and the unlocked state and the locked state of the lock mechanism can be switched by swinging and rotating operation. The lifting / lowering table is provided with an operating lever, and when the operating lever rotates from the locked position to the unlocked position so that it can be inserted and removed in a direction intersecting with the direction of swinging rotation of the operating lever. A lever lock pin that prevents the operation lever from rotating in the unlocking direction when inserted into a contact range, and a return spring that urges the lever lock pin to be always inserted into a range in contact with the operation lever. If the lever lock pin is not moved to the retracted position against the spring force of the return spring, the operation lever is unlocked. When the operation lever is moved to the lock position, the lever lock pin is automatically returned and inserted in a range where it comes into contact with the operation lever by the return spring, and the rotation of the operation lever is locked. Such a lifting table. A pin for controlling the opening / closing operation of a valve that cuts off the flow of oil in the gas spring with a lock mechanism, which is applied to a lift table having a gas spring with a lock mechanism as an actuator for assisting the lift operation of the leg. The lifting table according to claim 1, wherein a pedal for pushing the lever into the rod is controlled by rotation of the operation lever via a control cable. The operation lever includes a baffle plate that abuts the tip of the lever lock pin when the operation lever is in the unlocked position and prevents the lever lock pin from being inserted in a range of contact with the operation lever. The elevating table according to claim 1 or 2, which is provided. The operation lever is rotatably supported by a housing fixed to the back surface of the table, and has an operation lever for operating lever locking that passes through the housing and is arranged coaxially with the rotation center of the operation lever. The return rod is disposed between one end of the operation rod projecting from the housing and the housing, and the operation rod and the lever are disposed on the other end of the operation rod projecting from the housing. A plate that is connected in parallel with a lock pin and is movable is provided, and the lever lock pin is inserted into and removed from the operation lever by the axial movement of the operation rod, and the spring force of the return spring is used to The lift according to any one of claims 1 to 3, wherein the lever lock pin is inserted into a range in contact with the operation lever by returning the operation rod to the original position. Table.

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