JP4244138B2 - Elevating and moving device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevating and moving apparatus that supports a moving object such as furniture or a partition body so as to be movable up and down.
[0002]
[Prior art]
In recent years, furniture or a bookcase is used as a partition, and the partition is moved to partition a room into an arbitrary size. As a lifting and lowering movement device that can easily move a moving object such as a partition body, a movable base having a plurality of casters on the lower surface is provided on the fixed base, and the fixed base and the movable base are interposed between the fixed base and the movable base. It has been conventionally known that a plurality of screw jacks are provided, an operation shaft provided on the movable base is rotated, and each screw jack is operated simultaneously to move the fixed base and the movable base relatively. Yes.
[0003]
In the lifting / lowering apparatus, the movable object is supported by the movable base, the screw jack is operated by the rotation of the operation shaft to lower the movable base, the caster contacts the floor, the movable base stops, When the fixed base rises and the fixed base is lifted from the floor and the entire weight of the moving object acts on the caster of the movable base, the movable base is moved so that the movable target is moved to the target position. Yes.
[0004]
Here, the screw jack includes a nut member and a screw shaft that is screw-engaged with the nut member, and the nut member is rotatably provided on the movable base, while the lower end portion of the screw shaft is fixed to the fixed base. The movable base is moved up and down by the rotation of the nut member. Alternatively, contrary to the above, the lower end portion of the screw shaft is rotatably supported on the fixed base, the nut member is fixed to the movable base, and the movable base is moved up and down by the rotation of the screw shaft.
[0005]
By the way, in the elevating and moving apparatus as described above, when the operation shaft continues to rotate in the direction in which the fixed base is pulled up, the fixed base comes into contact with the lower surface of the movable base and the operation shaft is forcibly rotated in the same direction. Then, the nut member and the screw engaging portion of the screw shaft are strongly engaged and seizure occurs, or the next reverse rotation operation becomes extremely difficult.
[0006]
In order to eliminate such inconvenience, in the lifting and moving device (screw jack device) described in Japanese Patent Application Laid-Open No. 2001-287893, when the fixing base is pulled up to a predetermined height, the stopper mechanism is operated to operate. The rotating shaft that transmits rotational torque from the shaft to the screw jack is stopped.
[0007]
[Problems to be solved by the invention]
By the way, in the lifting / lowering apparatus employing the stopper mechanism, when the rotation shaft is prevented from rotating, there is a risk that a large impact is applied to the hand operating the operation shaft and the hand is damaged. In addition, since an impact is applied to the stopper mechanism every time the rotating shaft is prevented from rotating, there is an inconvenience that the stopper mechanism is easily damaged.
[0008]
The problem of the present invention is that the fixed base that is moved up and down by the rotation of the operation shaft can be reliably stopped at the upper limit position, and a large impact is prevented from being applied to the hand that rotates the operation shaft during the stop. It is to provide an elevating / lowering device that can be used.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, in the lifting and moving apparatus according to the present invention, a fixed base, a movable base disposed on the fixed base, and casters attached to the four corners of the lower surface, the fixed base and the movable base A plurality of screw jacks assembled between the bases, an operation shaft rotatably supported by the movable base, and a drive wheel provided coaxially with the operation shaft, through the drive wheel A torque transmission mechanism that transmits the rotation of the operating shaft to each of the screw jacks, and the lifting and lowering that moves the fixed base and the movable base relatively by simultaneously operating a plurality of screw jacks by the rotation of the operating shaft. In the moving device, a clutch that is incorporated between the operation shaft and the drive wheel and transmits and blocks rotation from the operation shaft to the drive wheel, and the clutch is controlled according to the up and down movement of the fixed base. And is to that adopted the configuration in which a control mechanism for switching the clutch to disengage when the fixing stand is raised to a predetermined height.
[0010]
If comprised as mentioned above, if an operation axis | shaft is rotated, a movable stand will descend | fall, and if the movable stand is supported and stopped by a floor surface, a fixed stand will raise. When the fixed base moves to a predetermined height, the clutch is switched to the disengaged state by the operation of the control mechanism, and transmission of rotational torque from the operating shaft to the screw jack is interrupted. As a result, the fixed base can be reliably stopped at a predetermined position, and the operation shaft is not freely rotated and stopped when the fixed base is stopped. It will not be added, nor will it hurt your hands.
[0011]
Here, the clutch includes a torque transmission plate that is prevented from rotating around the operation shaft and is supported so as to be movable in the axial direction, and a spring that presses the torque transmission plate in a direction overlapping the upper surface of the drive wheel. The drive wheel is provided with an engagement hole penetrating vertically, and the torque transmission plate is engaged with the engagement hole in a state where the torque transmission plate overlaps the upper surface of the drive wheel, and the lower end portion is the drive wheel. An engagement piece projecting downward is provided, and a tapered surface is provided on one lower side of the engagement piece. When the control mechanism is raised to the position where the taper surface faces the engagement hole when the fixing base is raised. What provided the pushing-up member which pushes up an engagement piece is employable.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a movable table 2 that supports a moving object is provided on the upper side of the fixed table 1, and casters 3 are attached to four corners of the lower surface of the movable table 2.
[0013]
Between the fixed base 1 and the movable base 2, a pair of left and right screw jacks 4 are provided on the front and rear. As shown in FIG. 3, the screw jack 4 includes a screw shaft 5 and a nut member 6 screwed to the screw shaft 5, and the lower end portion of the screw shaft 5 is fixed to the fixed base 1. On the other hand, the nut member 6 is rotatably supported by the movable table 2.
[0014]
As shown in FIG. 1 and FIG. 2, an operating shaft 7 that is vertically oriented is rotatably supported on the movable base 2, and a handle 8 for rotational operation is detachably supported on the upper end of the operating shaft 7. Yes.
[0015]
Between the operation shaft 7 and the nut members 6 of the plurality of screw jacks 4, a torque transmission mechanism 10 that transmits the rotation of the operation shaft 7 to each nut member 6 is provided.
[0016]
Here, as the torque transmission mechanism 10, a chain transmission mechanism is adopted. That is, a drive sprocket 11 as a drive wheel is provided on the operation shaft 7, a driven sprocket 12 is attached to the nut member 6 in each screw jack 4, and a chain 13 is passed between each driven sprocket 12 and the drive sprocket 11.
[0017]
The torque transmission mechanism is not limited to the chain transmission mechanism. For example, a gear transmission mechanism may be used.
[0018]
As shown in FIGS. 4 to 6, the operation shaft 7 has a square shaft portion 7a and a round shaft portion 7b provided at the lower portion thereof, and the drive sprocket 11 is rotatably supported by the round shaft portion 7b. Between the drive sprocket 11 and the operation shaft 7, a clutch 20 that transmits and blocks rotation from the operation shaft 7 to the drive sprocket 11 is incorporated.
[0019]
The clutch 20 is prevented from rotating by the angular shaft portion 7 a of the operation shaft 7 and is supported so as to be movable in the axial direction, and the torque transmission plate 21 is directed to a position where it overlaps the upper surface of the drive sprocket 11. The torque transmission plate 21 is provided with an engagement piece 24 engaged with each of a plurality of engagement holes 23 formed in the drive sprocket 11, and one side of each engagement piece 24. A tapered surface 25 is provided in the lower part, and in a state where the torque transmission plate 21 overlaps the upper surface of the drive sprocket 11, the rotation of the operation shaft 7 is transmitted to the drive sprocket 11 by the engagement of the engagement hole 23 and the engagement piece 24. ing. Further, when the torque transmission plate 21 is pushed up until the tapered surface 25 of the engagement piece 24 faces the engagement hole 23, the torque transmission plate is caused by the action of the inner periphery of the engagement hole 23 pressing the taper surface 25. 21 is raised to release the engagement between the engagement hole 23 and the engagement piece 24, and the rotation transmission from the operation shaft 7 to the drive sprocket 11 is cut off.
[0020]
The clutch 20 is controlled in accordance with the vertical movement of the fixed base 1, and when the fixed base 1 is pulled up to a predetermined height, the clutch 20 is switched to the disengaged state.
[0021]
The control mechanism 30 for controlling the clutch 20 is provided with a pressing member 31 on the fixing base 1, and when the fixing base 1 is raised, the engaging piece 24 of the torque transmission plate 21 is pushed up by the pressing member 31 and the engagement is performed. The tapered surface 25 of the piece 24 is positioned in the engagement hole 23.
[0022]
Here, the pressing member 31 is supported by a fixed pressing member 32 fixed to the upper surface of the fixed base 1 and a lower part of the operation shaft 7 so as to be movable up and down, and is pressed by the spring 33 against the upper surface of the fixed pressing member 32. And a washer 35 incorporated between the movable pressing member 34 and the drive sprocket 11.
[0023]
The lifting / lowering movement apparatus shown in the embodiment has the above-described structure, and the lifting / lowering movement apparatus supports the moving object A such as a partition body by the movable base 2. Although not shown in the figure, the moving object A is provided with a space in which the handle 8 can be attached to and detached from the operation shaft 7 and the handle 8 can be rotated in the mounted state.
[0024]
FIG. 1 shows an installation state of the moving object A. The movable table 2 is pulled up, the casters 3 are separated from the floor surface, and the fixed table 1 is supported by the floor surface. The clutch 20 is in an engaged state.
[0025]
Now, when the handle 8 is connected to the operation shaft 7 and the operation shaft 7 is rotated by operating the handle 8, the clutch 20 is in the engaged state, and therefore the rotation of the operation shaft 7 is transmitted to the drive sprocket 11, The rotation of the drive sprocket 11 is transmitted to the nut member 6 of each screw jack 4 via the chain 13.
[0026]
At this time, since the screw shaft 5 is in a fixed state, the nut member 6 moves up and down while rotating, and the movable base 2 moves up and down.
[0027]
When the handle 8 is continuously rotated in the direction in which the movable table 2 is lowered, the caster 3 comes into contact with the floor surface, and the movable table 2 is stopped by the contact. When the handle 8 is further rotated in the same direction from that state, the fixing base 1 is raised, and when the fixing base 1 is pulled up to a predetermined height, the pressing member 31 presses the engagement piece 24 of the torque transmission plate 21, The torque transmission plate 21 is raised by the pressing.
[0028]
As shown in FIG. 5 (II), when the torque transmission plate 21 is pushed up until the taper surface 25 of the engagement piece 24 is positioned in the engagement hole 23, the taper surface 25 is moved to the inner periphery of the engagement hole 23. As a result, the torque transmission plate 21 rises, the engagement piece 24 comes out of the engagement hole 23, and the clutch 20 is disengaged.
[0029]
Therefore, the rotation of the operating shaft 7 is not transmitted to the drive sprocket 11, and the fixed base 1 is held in a state where it is pulled up to a predetermined height as shown in FIG.
[0030]
Thus, since the clutch 20 is disengaged when the fixing base 1 is pulled up to a predetermined height, the fixing base 1 can be reliably stopped at a predetermined position, and after the fixing base 1 is stopped. Since the handle 8 can be freely rotated, no impact is applied to the hand operating the handle 8 when the fixed base 1 is stopped, and there is no inconvenience of hurting the hand.
[0031]
Further, when the rotation of the handle 8 is continued in a state where the fixed base 1 is stopped and held at a predetermined height, the engagement piece 24 of the torque transmission plate 21 repeatedly engages and disengages from the engagement hole 23. Since the torque transmission plate 21 collides with the drive sprocket 11 and generates a collision sound at the time of fitting, it can be confirmed that the fixed base 1 is stopped and held by the collision sound.
[0032]
Further, since the rotational resistance of the handle 8 is small, it can be confirmed from the rotational operation force that the fixed base 1 is stopped and held.
[0033]
Here, in a state where the fixed base 1 is pulled up, the moving object A is supported by the casters 3 of the movable base 2, and therefore the moving object A can be easily moved to an arbitrary position.
[0034]
When the moving object A is installed after moving, the operating shaft 7 is rotated in the opposite direction by operating the handle 8. At this time, since the engaging piece 24 engages with the engaging hole 23 and the rotation of the operation shaft 7 is transmitted to the nut member 6 of the screw jack 4, the fixing base 1 is lowered, and the fixing base 1 is moved to the floor surface. When the movable table 2 is lifted and the caster 3 is pulled up from the floor, the moving object A is supported by the fixed table 1.
[0035]
Here, in the case where the moving object A is slightly lower than the dimension from the floor surface to the ceiling, the moving object A can be pressed against the ceiling by raising the movable table 2, and the falling of the moving object A can be prevented. it can.
[0036]
【The invention's effect】
As described above, in the present invention, when the movable table is lowered by the rotation of the operation shaft, the caster of the movable table comes into contact with the floor surface, the movable table stops, and then the fixed table rises and the fixed table is fixed. When the base is pulled up to a predetermined height, the clutch is disengaged and transmission of the rotational torque from the operating shaft to the screw jack is interrupted, so that the fixed base can be reliably stopped at the predetermined position. In addition, since the handle for rotating the operating shaft is not prevented from rotating when the fixed base is stopped, no impact is applied to the rotating hand and the hand is not damaged.
[Brief description of the drawings]
FIG. 1 is a partially cutaway plan view showing an embodiment of an elevating and moving apparatus according to the present invention. FIG. 2 is a longitudinal front view of FIG. 1. FIG. 3 is a longitudinal front view of a screw jack portion of FIG. Fig. 5 is a partially cutaway side view showing the clutch portion of Fig. 4, and Fig. 5 (II) is a partially cutaway side view showing the clutch disengaged state. 6 is an exploded perspective view of the clutch portion shown in FIG. 5. FIG. 7 is a longitudinal front view of the state where the fixing base is pulled up.
DESCRIPTION OF SYMBOLS 1 Fixed stand 2 Movable stand 3 Caster 4 Screw jack 7 Operation shaft 10 Torque transmission mechanism 11 Drive sprocket (drive wheel)
20 Clutch 21 Torque transmission plate 22 Spring 23 Engagement hole 24 Engagement piece 25 Tapered surface 30 Control mechanism 31 Press member

Claims (2)

A fixed base, a movable base disposed on the fixed base and having casters attached to the four corners of the lower surface, a plurality of screw jacks assembled between the fixed base and the movable base, and rotating to the movable base The operation shaft is freely supported, and includes a drive wheel provided coaxially with the operation shaft, and a torque transmission mechanism that transmits the rotation of the operation shaft to each of the screw jacks through the drive wheel. In a lifting / lowering device in which a plurality of screw jacks are simultaneously operated by rotation of the operation shaft to relatively move the fixed base and the movable base, the lift shaft is incorporated between the operation shaft and the drive wheel and is moved from the operation shaft. A clutch that transmits and shuts off rotation to the drive wheel, and the clutch is controlled according to the up and down movement of the fixed base, and the clutch is disengaged when the fixed base is pulled up to a predetermined height. Vertical moving device, characterized in that the provided control mechanism for switching to. The clutch includes a torque transmission plate that is prevented from rotating around the operation shaft and is supported so as to be movable in the axial direction, and a spring that presses the torque transmission plate in a direction overlapping the upper surface of the drive wheel, The drive wheel is provided with an engagement hole penetrating vertically, and the torque transmission plate is engaged with the engagement hole in a state where the torque transmission plate overlaps the upper surface of the drive wheel, and the lower end portion is below the drive wheel. The control mechanism is configured to provide a taper surface at one side lower part of the engagement piece, and the control mechanism is engaged to a position where the taper surface faces the engagement hole when the fixing base is raised. The raising / lowering movement apparatus of Claim 1 which consists of a structure provided with the raising member which pushes up a piece.

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