JP2000217639A - Movable desk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable desk wherein the height of a fixed leg is low, and in addition, a vertically movable mechanism which firmly depresses a movable section to a floor surface, is provided. SOLUTION: A movable caster 7a is arranged between an adjuster 8 which does not vertically move, and a fixed caster 7b, at the lower section of a fixed leg 60. Also, a vertically moving mechanism 90 of the movable caster 7a is equipped with a cam 91 linked with a rotating shaft of a shelf guide 52 having a top plate 4 and a parallel link mechanism, a rod 93 the upper end of which is axially supported by the end section of the cam 91, and a lift member 94 the front and rear of which are axially supported by the lower end of the rod 93 and the fixed leg 60, and which is equipped with the movable caster 7a at the front lower section. In this case, in the structure, the lift member 94 can be located in the vicinity of the central section in the fixed leg 60, and the height of the leg 60 at both ends, can be made lower. Also, the movable caster 7a is firmly depressed to a floor surface by the vertically moving mechanism 90 which is interlinked with the rotation of the top plate 4, and does not swing in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile desk which can be easily moved by bringing only casters into contact with the floor when necessary.

[0002]

2. Description of the Related Art Conventionally, there is a mobile desk which is composed of a top plate, a leg supporting the top plate, and a caster provided at a lower portion of the leg, and can be easily moved. It is important for such a mobile desk to be able to move easily when moving, and not to move easily when in use.

In order to make these two problems compatible, Japanese Patent Application Laid-Open No. 9-294633 discloses a top plate, a standing leg provided on the left and right sides of the top plate, and a lower end of the standing leg having a width in the front-rear direction. A mobile desk including a fixed foot, casters provided one at each of the front and rear ends of the fixed foot lower portion, and a contact portion (adjuster) provided between the two casters at the lower portion of the fixed foot is disclosed. I have.

[0004] The interior of each of the standing leg and the fixed foot of this mobile desk is hollow, and the hollow portions are connected at the connecting points. In addition, the top plate is provided so as to be rotatable with respect to the standing leg around the left-right direction, and one of the front and rear casters is configured to be able to move up and down via a lifting mechanism described below.

[0005] The elevating mechanism is provided in the hollow portion of the standing leg and the fixed foot, and includes a frame, a rod, a lift member, and a torsion coil spring. The frame is provided at the upper end of the standing leg and has a through hole communicating with the inside of the standing leg. The rod is a rod-like member provided substantially vertically inside the standing leg,
The upper end is vertically penetrated through the through hole of the frame so as to be movable up and down. The lift member is a long member provided inside the fixed foot along the fixed foot, one end of which is pivotally supported by the lower end of the rod, and a central portion which is pivotally supported by the fixed foot. The torsion coil spring is provided at a pivotal support point between the lift member and the fixed foot. One of the two arm portions of the torsion coil spring is fixed to the lift member, and the other is fixed to the fixed foot, and presses and moves the end of the lift member on the side that supports the rod. A caster is provided at a lower portion of the end of the lift member opposite to the rod via a through hole provided at a lower portion of the fixed foot. This caster is the above-mentioned movable caster.

[0006] The movable caster is moved up and down by rotating the top plate. That is, when the top plate is in a horizontal position, the upper end of the rod penetrating the through hole of the frame comes into contact with the lower surface of the top plate and is pushed down, so that the rod-side end of the lift member is pushed downward. Then, the end on the movable caster side is moved upward. As a result, the movable caster is moved above the adjuster, so that the other fixed caster, which cannot be moved up and down, and the adjuster are in a fixed state in which the adjuster is in contact with the floor and supports the mobile desk so as not to move.

On the other hand, when the top plate is rotated to a vertical position, the lower surface of the top plate is separated from the upper end of the rod, and the end of the lift member on the rod side is pushed upward by the elastic force of the torsion coil spring. Moved and the rod is positioned upwards. As a result, the movable casters are moved below the adjusters, and only the front and rear casters contact the floor,
The mobile desk is in a movable state where it can be easily moved.

The mobile desk described in Japanese Utility Model Publication No. 5-17953 has a top plate, standing legs provided on the left and right sides of the top plate, and fixed members provided at the lower ends of the standing legs with a width in the front-rear direction. The vehicle includes a foot, casters provided one at each of the front and rear ends of the fixed foot lower portion, and a contact portion (base) provided between the two casters at the lower portion of the fixed foot.

In this mobile desk, Japanese Unexamined Patent Application Publication No. 9-294633
As in the mobile desk described in the publication, the inside of the standing leg and the fixed foot is hollow, and the hollow portions are connected at the connecting portion. Further, the top plate is rotatable with respect to the standing leg around the left-right direction. The base is also a movable part that moves up and down through the following elevating mechanism.

The elevating mechanism of the mobile desk is provided inside the standing leg and the fixed foot, and includes a rod, a slider, a sliding receiver,
It consists of a vessel, an upper coil spring, and a lower coil spring.
The rod is a rod-like member provided substantially vertically inside the standing leg, and has an upper end portion penetrating the opening surface of the upper end of the standing leg so as to be vertically movable. The slider is a columnar member having a flange formed on the outer peripheral portion so as to protrude to a uniform length, and the upper end is connected to the lower end of the rod. The sliding receiver is a columnar member provided with a concave portion at the upper end, a screw hole at the lower end, and a flange protruding from the outer peripheral portion with a uniform length. The lower end of the slider is inserted into the recess at the upper end of the slider so as to be vertically movable. The organ tube is a cylindrical member provided vertically above and below the fixed foot, and the upper end is fixed to the fixed foot. Although the upper end of the vessel tube is open, the lower end has a bottom surface portion, and a central portion of the bottom surface portion has a through hole through which a cylindrical portion excluding a flange portion of the slide receiver can be inserted. A slide and a slide receiver are inserted in the inner diameter part of the vessel tube in the axial direction, and a cylindrical portion of the slide receiver penetrates through a through hole in the bottom part. The upper coil spring is interposed between the flange of the slider and the flange of the sliding receiver, and presses the sliding receiver downward. The lower coil spring has a smaller resilient force (smaller spring constant) than the upper coil spring, and is interposed between the flange of the sliding receiver and the bottom of the instrument tube to press the sliding receiver. Moving up. Then, the base having a through hole vertically penetrated, a screw hole at the lower end of the sliding receiver, through this through hole,
Screwed and fixed.

The elevation of the base is performed by rotating the top plate. In other words, when the top plate is in a horizontal position,
The upper end of the rod penetrating the opening surface of the upper end of the standing leg abuts on the top plate supporting member provided on the lower surface of the top plate and is pushed down, and the base of the base is elastically raised by the elastic force of the upper coil spring. Ground on the surface. At this time, the two casters do not float, and the friction between the base and the floor surface
It will be in a fixed state that will not move. On the other hand, when the top plate is rotated to the vertical position, the top plate support member is separated from the upper end of the rod, so that the compression state of the upper coil spring is relaxed, and the base is raised from the floor surface by the pushing-up elastic force of the lower coil spring. Since it is positioned above, only the front and rear casters are in a movable state in which the casters are in contact with the floor.

[0012]

However, in the mobile desk described in Japanese Patent Application Laid-Open No. 9-294633, one end of the lift member that moves up and down is located at one end of the fixed foot. Has to be raised at least at this end, and there is a problem that it obstructs the user's foot.
Further, since the movable caster is grounded to the floor only by the elastic force of the torsion coil spring, there is a problem that if the elastic force of the torsion coil spring becomes weak, the movable caster cannot be sufficiently pushed down.

[0013] In the mobile desk described in Japanese Utility Model Publication No. 5-17953, the base that moves up and down is provided directly below the standing leg below the fixed foot, and does not use the above-described lift member. However, because the base is grounded to the floor only by the spring force of the coil spring, if the spring force of the coil spring is weakened, the frictional force between the base and the floor surface is weakened, and the mobile desk can move easily. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a mobile desk having a fixed foot with a low height and an elevating mechanism for firmly pressing a movable part against a floor. .

[0015]

According to a first aspect of the present invention, there is provided a mobile desk provided with a top plate, and left and right sides of the top plate for supporting the top plate. A pair of standing legs, a fixed foot provided with a width in the front-rear direction at at least one lower end of the pair of standing legs, and at least one provided at a lower part in front of and behind the fixed foot. A pair of casters, a contact portion provided at a lower portion of the fixed foot, and one of three elements provided along the standing leg and including the pair of casters and the contact portion as a movable portion, An elevating mechanism for elevating and lowering the movable part by an external operation, by moving the movable part up and down via the elevating mechanism, the contact part is relatively moved from one of the front and rear casters. On the floor Grounding, the contact portion is positioned relatively higher than one of the front and rear casters, and only the casters contact the floor surface. Thereby, in the movable desk which can be set to any one of a movable state in which the movable desk can be moved, the movable part is a movable part among three elements arranged below the fixed foot. It is characterized by being arranged between two elements which are not determined.

According to a second aspect of the present invention, in the mobile desk according to the first aspect, the top plate is rotatable about a left-right direction via a top plate support portion. The elevating mechanism is provided on the standing leg, and the cam is rotated around an axis parallel to the rotation axis in conjunction with the rotation of the top plate, and is supported by an end of the cam. A rod, which is a bar-like member disposed substantially vertically along the standing leg, wherein the movable portion is connected to an end of the rod opposite to the cam.

According to a third aspect of the present invention, in the mobile desk according to the second aspect, one end is rotatably supported at an end of the rod opposite to the cam, and the other end is fixed. An elongate lift member pivotally supported by a foot is provided, and the movable portion is disposed below a portion of the lift member pivotally supported by the rod.

Further, according to a fourth aspect of the present invention, in the mobile desk according to the second or third aspect, an external operation is performed on the rotation axis of the cam regardless of the rotation of the top plate. Thus, an operation lever for rotating the cam to move the movable portion up and down is provided.

According to a fifth aspect of the present invention, in the mobile desk according to any one of the first to fourth aspects, the fixed foot is provided with protection for absorbing shock from a side surface to a lower surface of the fixed foot. A cover is provided.

[0020]

In the mobile desk according to the first aspect of the present invention, only one of the front caster, the rear caster, and the contact portion below the fixed foot is a movable portion, and the movable portion is not a movable portion. It is placed between the other two elements. In this case, the elevating mechanism of the movable part provided along the standing leg can be located near the center in the fixed foot. That is, the height at both ends of the fixed foot can be made lower than that of the mobile desk described in Japanese Patent Application Laid-Open No. 9-294633 because the height of the fixed foot is not provided inside the fixed desk. No.

When the caster is a movable part, the position of the center of gravity of the movable table is set above the movable part and the other caster that is not a movable part. When the mobile desk is used as a desk, the movable part is moved up, and when the mobile desk is moved, it is moved down. That is, when the movable portion is moved upward, only the other caster and the contact portion, which are not the movable portion, are brought into contact with the floor, and a fixed state in which the movement of the mobile desk is prevented by the frictional force between the contact portion and the floor. When the movable part is moved downward to be positioned below the other two elements, the movable desk is tilted toward the other caster that is not the movable part, and only the movable part and the other caster that is not the movable part are on the floor. It touches the surface and becomes movable.

When the contact portion is a movable portion, the position of the center of gravity of the mobile desk is set above the movable portion and one caster that is not the movable portion. When the mobile desk is used as a desk, the movable part is moved down, and when the mobile desk is moved, it is moved up. That is, when the movable part is moved downward to be positioned below the other two elements, the movable desk is tilted to the one caster side, and only the movable part and this caster are in contact with the floor surface and the fixed state is established. Become. In this case, the height of the fixed foot end opposite to the grounded caster from the floor is slightly higher than the grounded caster end. However, if the caster that is in contact with the ground is the side on which the chair is placed, there is no problem because the height of the fixed foot near the user's foot is low. Also,
When the movable portion is moved upward, only the front and rear casters, which are not the movable portion, are in contact with the floor and are in a movable state.

The fixed feet may be provided at the lower ends of both the left and right standing legs, or the fixed feet may be provided only at the lower ends of one of the standing legs. For example, the fixed foot provided with the caster and the contact portion as described above at the lower portion may be provided only at the lower end of one standing leg, and only the caster may be directly provided at the lower end of the other standing leg. Further, a housing having at least one or more drawers may be provided on the other standing leg, and a caster may be provided at a lower portion of the housing.

Further, it is not necessary to limit the number of casters at the front and the rear of the lower portion of the fixed foot to one, and two or more casters may be provided respectively. On the other hand, if a cam and a rod are provided and the movable part is connected to the lower end of the rod as in the mobile desk according to the second aspect, the movable part can be raised and lowered only by an external operation of rotating the top plate. .

In this elevating mechanism, when the top plate is rotated,
The cam is rotated around an axis parallel to the rotation axis of the top plate, and the rod supported by the end of the cam is moved up and down. This allows
The movable part connected to the lower end of the rod can be raised and lowered. It is practically preferable that the movable desk be configured to be in a fixed state when the top plate is substantially horizontal and to be movable when the top plate is rotated to be parallel to the standing leg.

The mechanism for interlocking the rotation of the cam with the rotation of the top plate may be a mechanism in which a gear mechanism is provided between the rotation axis of the top plate and the rotation axis of the cam. A cam may be directly provided on the rotation axis of the plate. Further, a shelf having a top plate and a parallel link mechanism is provided, and a shelf that is rotated around an axis parallel to the rotation axis of the top is provided below the top in parallel with the top, and a rotation axis of the shelf is provided. A gear mechanism may be provided between the cam and the rotating shaft of the cam, or a cam may be provided directly on the rotating shaft of the shelf.

On the other hand, if the movable part is directly connected to the lower end of the rod, the movable part may swing back and forth. Therefore, as in the mobile desk according to the third aspect, a lift member pivotally supported at the lower end of the rod and the fixed foot is provided, and a movable portion is provided at a lower front portion of the lift member. It is positioned at a fixed position by the rotation angle of the cam without swinging back and forth.

Further, in the mobile desk according to the second or third aspect, the fixed state or the movable state cannot be set unless the top plate is rotated, which may be troublesome. Therefore,
If the operation lever is provided on the rotation shaft of the cam as in the mobile desk according to claim 4, the cam is rotated only by operating the operation lever without rotating the top plate, and the movable portion is provided. Can be raised and lowered.

Further, as in the mobile desk according to the fifth aspect,
If you provide a protective cover from the side of the fixed foot to the bottom,
When the fixed foot side collides with a wall or the like when moving the mobile desk, or when the user's shoe tip hits the fixed foot side,
Functions as a bumper for shock absorption. Also, even if the user's shoe tip accidentally enters the gap between the fixed foot and the floor,
No scratches on the shoe tip.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a side view of a mobile desk 1 as one embodiment of the present invention, which is partially seen through to show a lifting mechanism 90 described later. In FIG. 1, the right side is the side on which the chair is placed, and hereinafter, this will be described as the rear of the mobile desk 1.

The mobile desk 1 has standing legs 2 provided on both left and right sides.
And a top plate 4 provided via a top support portion 30 so as to be rotatable about the left-right direction at an upper portion of the top 2, and a top plate 2 provided below the top 4 so as to be rotatable. 4, a shelf 50 having a parallel link mechanism, a fixed foot 60 provided at the lower end of the standing leg 2 with a width in the front-rear direction, and casters 7a provided one at the front and rear of the lower portion of the fixed foot 60.
And 7b, and an adjuster 8 provided at a lower portion of the fixed foot 60 further forward than the front caster 7a,
An elevating mechanism 90 for elevating and lowering the front casters 7a.

The standing leg 2 is a tubular member having a rectangular cross section which is vertically arranged with its upper end inclined slightly rearward, and has a flat closed surface at the upper end. The fixed foot 60 is a hollow member having a width in the front-rear direction, and is connected to the standing leg 2 at a position slightly behind the front end. The hollow portion of the fixed foot 60 is
The lower part has an open surface, and is connected to the inside of the standing leg 2 at a connection point with the standing leg 2. An adjuster 8 is provided below the front end of the fixed foot 60, and a caster 7b (hereinafter, referred to as a fixed caster) is provided below the rear end. In addition, the adjuster 8 below the fixed foot 60
A caster 7a (hereinafter, referred to as a movable caster) is provided between the and the fixed casters 7b so as to be able to ascend and descend below the connecting portion between the standing leg 2 and the fixed feet 60. The movable caster 7a corresponds to a movable section of the present invention. Adjuster 8
Corresponds to the contact portion of the present invention, and is provided by screwing a screw portion at the tip into a screw hole below the fixed foot 60. The height of the adjuster 8 between the lower end of the adjuster 8 and the lower part of the fixed foot 60 can be adjusted by the amount of screwing into the fixed foot 60.

The top plate 4 is a plate material having flat upper and lower surfaces, and is provided with a beam frame 31 provided at a lower portion, a top plate rotating shaft, and a top plate supporting portion 30 including a standing leg connecting portion. It is provided on the upper part. The beam frames 31 are provided one by one on the left and right of the lower portion of the top plate 4. The beam frame 31 has a shape obtained by bending a plate material at a right angle. One flat surface portion is a horizontal portion parallel to the top plate 4, and is screwed to the top plate 4 through a through hole provided in the horizontal portion. Fixed. The other flat portion is a vertical portion parallel to the front-rear direction, and is provided by being bent vertically downward from a side near the center of the top plate 4 in a horizontal portion fixed to the top plate 4. The vertical portion of the beam frame 31 has a through hole 31a penetrating left and right at a position slightly forward from the center, and a top plate rotating shaft (not shown) having the through hole 31a penetrated in the left and right direction. ) Is connected to a standing leg connecting portion (not shown) that connects between the upper ends of the left and right standing legs 2. That is,
The top plate 4 with the beam frame 31 is provided rotatably with respect to the standing leg 2 around the axis O of the top plate rotation shaft that is penetrated through the through-hole 31a.

A lock lever 10 is provided below the top plate 4.
Is provided. The lock lever 10 restricts or permits the rotation of the top plate 4. In a state where the top plate 4 is substantially horizontal and a state where the top plate 4 is rotated counterclockwise to be parallel to the standing leg 2, A hook (not shown) provided at the front end of the lock lever 10 engages with a pin (not shown) provided on the above-mentioned standing leg connecting portion, and regulates the rotation of the top plate 4. When rotating the top plate 4, the lock regulation is released by previously pulling the lock lever 10 toward the top plate 4 and removing the hook from the pin portion.

The lifting mechanism 90 of the shelf 50 and the movable casters 7a is shown in FIG.
This will be described with reference to an exploded perspective view of FIG. Note that FIG. 2 shows only the elevating mechanism 90 on the right side of the mobile desk 1, and a similar mechanism is actually provided on the left side that is paired with the elevating mechanism 90. In addition, the standing leg 2 and the shelf 50 are appropriately cut, and only a part thereof is shown.

The shelf 50 includes a shelf pipe 51, a shelf guide 5
2 and a shelf joining pipe 53, which are connected to the beam frame 31 by the guide link 11. The shelf pipe 51 is a tubular member disposed in the left-right direction between the left and right standing legs 2 slightly below the top plate 4 and has openings at both ends. The shelf pipe 51 is provided rotatably about an axis via an elevating mechanism 90 described later.

The shelf guide 52 is provided in the shelf pipe 51 for
It is a bar-like member provided so as to project rearward one by one at a position near the left and right standing legs 2. The shelf guide 52 has, at the front end, an insertion hole 52a penetrating left and right.
The shelf pipe 51 is provided so as to be freely rotatable through 2a. A shelf joining pipe 53 is provided in the left and right direction at an intermediate portion and a rear end portion between the front end and the rear end of the shelf guide 52, and the left and right shelf guides 52 are connected.

Through holes are provided at a position P slightly behind the outer side surface of the shelf guide 52 (that is, a side surface near the standing leg 2) and a position Q slightly behind the vertical portion of the beam frame 31. In addition, a guide link 11 of a rod-shaped member having through holes at both ends is supported by pins. Thus, the shelf guide 52 has a parallel link mechanism that is always rotated in parallel with the top plate 4 that is rotated about the axis O.

The inner end of the insertion hole 52a (that is, the end on the side facing the other shelf guide 52) has the insertion hole 5
The two notches 52 are located symmetrically with respect to the center of 2a.
b is formed. On the other hand, on the side of the shelf pipe 51,
A through-hole 51a penetrating in a direction perpendicular to the axial direction is formed corresponding to the notch 52b. A rod-shaped pin 54 is inserted through the through hole 51a, and both ends of the pin 54 are inserted into the through hole 5a.
It is fixed in a state of protruding from both ends of 1a. 1 and 2, the shelf guide 52 is substantially horizontal.
Are in contact with one end in both of the two notches 52b. Shelf pipe 51,
If the shelf guide 52 is rotated counterclockwise from the state of FIG. 1 while maintaining the shelf guide 52 substantially horizontal, it is necessary to rotate the shelf guide 52 counterclockwise to be in a state parallel to the standing leg 2. It can be rotated by an appropriate angle. The rotation of the shelf pipe 51 is restricted by the both ends of the pin 54 abutting on the other end in both of the two notches 52b.

The elevating mechanism 90 of the movable caster 7a includes a cam 91, a cam shaft 92, a rod 93, a lift member 94, an operation lever 95, and a fine adjustment spring 96. Cam 91
Is provided at a position corresponding to the end of the shelf pipe 51 inside the standing leg 2. The cam 91 is a member having a U-shaped cross section formed by bending a plate material.
In the state shown in FIGS. 1 and 2 in which is substantially horizontal, two flat portions facing each other are parallel in the up-down and front-rear directions, and another flat portion connecting the two surfaces is disposed above. In the two flat portions facing the cam 91 in this state, a pin hole 91a and an oval hole 91b penetrating in the left-right direction are formed at front and rear portions. Corresponding to the oval hole 91b, an insertion hole (that is, a wall surface on the shelf pipe 51 side) and an outer wall surface (that is, a wall surface on the opposite side to the shelf pipe 51) of the standing leg 2 are provided. (Not shown) is provided. Note that the two insertion holes, the oval hole 91b, and the axis of the shelf pipe 51 coincide with each other.

The cam shaft bar 92 is a bar-shaped member provided in the left-right direction. The cam shaft bar 92 includes a shelf pipe 51 inside the standing leg 2, a cam 91 inside the standing leg 2, and an operation lever 95 outside the standing leg 2. Connected. The shape of the cam shaft bar 92 is different between the left and right sides of the middle portion. That is, the shelf pipe 5
1 and the cam 91, the section is an oval shaft portion 92 a having an oval cross section, and the mounting portion to the operation lever 95 is a perfect circular shaft portion 92 b having a perfect cross section. In addition, a screw hole 9 is provided in a flat portion of the side surface of the oval shaft portion 92a.
2c is formed, and a screw hole 92d is also formed on the side surface of the true circular shaft portion 92b.

The cam shaft 92 is inserted into an opening at the end of the shelf pipe 51 on the shelf pipe 51 side. And
A screw 55 is screwed into the screw hole 92c via a through hole 51b formed on a side surface of the shelf pipe 51, and the cam shaft 92 and the shelf pipe 51 are fixed integrally. .

The cam shaft 92 is inserted into an oval hole 91b through an insertion hole in the inner wall surface of the standing leg 2, and the perfect circular shaft portion 92b of the cam shaft rod 92 is connected to the outer wall surface of the standing leg 2. Is located outside through the insertion hole. That is, the oval shaft 92a and the oval hole 91b are engaged with each other,
Is rotated integrally with the shelf pipe 51.

The rod 93 is a rod-like member arranged substantially up and down along the standing leg 2, and has through holes 93a and 93b penetrating in the left and right directions at the upper and lower ends.
The upper end of the rod 93 is disposed at a position corresponding to the pin hole 91a between two opposing flat portions of the cam 91, and the through hole 93a and the pin hole 91a are made to pass through the rod-shaped pin 93c, so that the cam 91 is formed. It is supported rotatably.

The lift member 94 is a member having a U-shaped cross section formed by bending a plate material. Two opposing flat portions are parallel in the vertical and front-rear directions, and the other flat portion connecting the two surfaces is downward. It is arranged in the fixed foot 60 so as to be located. The lift member 94 arranged in this way is a long member that is long in the front-rear direction, and a through hole 94 that penetrates in the left-right direction is provided in front and rear of two opposing flat portions.
a and 94b are formed.

The front portion of the lift member 94 is arranged such that the lower end of the rod 93 is located at a position corresponding to the through hole 94a between two opposing flat portions of the lift member 94, and the through hole 94a and the through hole 93b are provided. Is penetrated through a rod-shaped pin 93d to be rotatably supported by the rod 93. A movable caster 7a is provided at a lower portion of a front portion of the lift member 94 (that is, a lower portion of a portion of the lift member 94 supported by the rod 93).

The rear portion of the lift member 94 is located between the movable caster 7a and the fixed caster 7b, and rivets a through hole 61 and a through hole 94b formed through the left and right side surfaces of the fixed foot 60 in the left and right direction. By being penetrated through 62, it is rotatably supported by the fixed foot 60.

The operation lever 95 is connected to a perfect circular shaft portion 92b of a cam shaft rod 92 located outside through an insertion hole in the outer wall surface of the standing leg 2. The operation lever 95 is provided with the insertion hole 95a and the fine adjustment spring fixing portion 95 in the flat portion on the side of the standing leg 2.
b, and a protruding grip portion is provided on a plane perpendicular to the plane portion on the side of the standing leg 2. The insertion hole 95a is
A concave portion formed at the center of the flat portion on the side, into which the true circular shaft portion 92b of the cam shaft rod 92 is inserted. Insert hole 9
5a is connected to a through hole formed in a plane perpendicular to the plane portion on the side of the standing leg 2. And in the screw hole 92d,
A screw 95c is screwed through the through hole, and the operation lever 95, the cam 91, and the shelf pipe 51 are integrally fixed via a cam shaft rod 92.

The fine adjustment spring fixing portion 95b is
This is an annular hole formed outside of the insertion hole 95a with the same axis as a, into which the coil portion of the fine adjustment spring 96, which is a torsion coil spring, is inserted. Fine adjustment spring 9
One of the six arm portions is fixed inside the fine adjustment spring fixing portion 95b, and the other is fixed on the side surface of the standing leg 2. The fine adjustment spring 96 supports the cam 91 fixed integrally with the operation lever 95 and the rotation angle of the shelf pipe 51 so that the rotation angle is stable in the state of FIG.

On the other hand, end protection covers 63a are provided on the front and rear side surfaces of the fixed foot 60, and plate-like side protection covers 63b having a width in the front-rear direction are provided on the left and right side surfaces. . The protective covers 63a and 63b have lower ends bent inwardly of the fixed feet 60 as shown in the cross-sectional views taken along the line AA 'of FIG. 1 shown in FIGS. It is located below the foot 60.

The protective covers 63a, 63b are used when the side of the fixed foot 60 collides with a wall or the like during the movement of the mobile desk 1, or when the shoe tip of the user hits the side of the fixed foot 60, etc.
Functions as a bumper for shock absorption. The lower ends of the protective covers 63a and 63b are bent inward of the fixed feet 60, and the bent portions are fixed feet 6a.
Since the shoe tip is located at the lower portion of the shoe, even if the shoe tip of the user accidentally enters the gap between the fixed foot 60 and the floor, the shoe tip is not damaged.

Next, the operation when using the mobile station 1 will be described. When the mobile desk 1 is used as a desk, that is, in the state of FIG. 1 in which the top plate 4 and the shelf guide 52 are substantially horizontal, the front end of the lift member 94 is located above the rear end, and the movable caster 7a is 8 and the fixed casters 7b. At this time, the fixed foot 60 is substantially parallel to the floor, and only the adjuster 8 and the fixed casters 7b are grounded on the floor. That is, the mobile desk 1 is in a fixed state in which it is not moved by the frictional force between the adjuster 8 supporting the weight of the front end of the mobile desk 1 and the floor surface.

Further, in the mobile desk 1, the movable caster 7a can be moved up and down only by rotating the top plate 4. Here, the top plate 4 is connected to the lock lever 1 as described above.
When the rotation restriction is released by pulling 0 toward the top plate 4, the rotation becomes possible about the axis O. When the top plate 4 is rotated to be in a state parallel to the standing leg 2 or in a substantially horizontal state, the rotation is again restricted.

FIG. 4 shows a state in which the top plate 4 is rotated counterclockwise about the axis O from the state shown in FIG. When the top plate 4 is rotated to be in a state parallel to the standing leg 2, the shelf link 52 having a parallel link mechanism with the top plate 4 is also rotated by the guide link 11 by the same angle in the same direction, and is in a state parallel to the standing leg 2. Becomes Then, shelf pipe 5
1 is rotated integrally with the shelf guide 52 against the elastic force of the fine adjustment spring 96 since the pin 54 is in contact with one end of the notch 52b. Then, the cam 91 connected to the shelf pipe 51 via the cam shaft 92 is similarly rotated, and the front end is directed downward. As a result, the rod 93 is pushed downward, and the front end of the lift member 94 is rotated downward about the rear through hole 94b. here,
The center of gravity of the mobile desk 1 has a movable caster 7a and a fixed caster 7b.
When the movable caster 7a is moved below the adjuster 8 and the fixed caster 7b, the mobile desk 1 is tilted backward. As a result, the front end of the fixed foot 60 is located slightly above the rear end, and only the movable caster 7a and the fixed caster 7b are in contact with the floor, so that the mobile desk 1 is in a movable state.

At this time, the movable caster 7a is firmly pushed down by the cam 91 and the rod 93 without the elastic force of the spring. The movable caster 7a is
3 is not provided directly at the lower end, but is provided at the lower front portion of the lift member 94 pivotally supported by the lower end of the rod 93 and the fixed foot 60, so that it does not swing back and forth,
It is positioned at a fixed position by the rotation angle of the cam 91.

That is, the movable caster 7a is firmly pushed down on the floor surface and does not swing back and forth as compared with the conventional technique in which the movable portion is pushed down only by the elastic force of the spring. Further, since the movable caster 7a supports only the weight in front of the mobile desk 1, there is little problem in the strength of the lifting mechanism 90 that pushes down the movable caster 7a.

From the movable state shown in FIG. 4, the top plate 4 and the shelf guide 52 having the parallel link mechanism with the top plate 4 are rotated clockwise to return the top plate 4 and the shelf guide 52 to a substantially horizontal state. The reverse operation occurs. At this time, shelf guide 5
With the rotation of 2, the notch 52b is moved in a direction away from the pin 54, but due to the weight in front of the mobile desk 1 supported by the movable caster 7a and the elastic force of the fine adjustment spring 96,
The shelf pipe 51 is rotated following the shelf guide 52. As a result, the movable caster 7a includes the cam 91, the rod 93,
The lift member 94 is linked with the adjuster 8 and the fixed casters 7b, so that only the adjuster 8 and the fixed casters 7b are in the fixed state in FIG.

Further, in the mobile desk 1, even when the top plate 4 and the shelf guide 52 remain substantially horizontal as shown in FIG. 1, the operating lever 95 connected to the rotating shaft of the cam 91 is provided.
The movable caster 7a can be moved up and down only by rotating. FIG. 5 shows a state where the movable caster 7a is lowered while the top plate 4 and the shelf guide 52 are kept substantially horizontal.

When the operation lever 95 is rotated counterclockwise from the state shown in FIG. 1 against the reaction force of the fine adjustment spring 96,
The pin 54 can be turned by an angle at which the pin 54 is moved from one end to the other end of the cutout 52b. This angle is equal to the angle at which the shelf guide 52 is rotated from a substantially horizontal state to a state parallel to the standing leg 2 as described above. When the operation lever 95 is rotated by this angle, the cam 91 connected to the operation lever 95 via the cam shaft bar 92 is also rotated. Therefore, the cam 91 and the rod 9 are rotated similarly to the case of FIG.
3 and the lift member 94 are linked to each other, so that only the movable casters 7a and the fixed casters 7b are in a movable state in which they contact the floor surface.

It should be noted that the movable caster 7a is located below only while the operation lever 95 rotated as described above is supported by a hand or the like. When the support of the operation lever 95 is released, the operation lever 95 is rotated clockwise by the weight of the front end of the movable table 1 supported by the movable caster 7a and the elastic force of the fine adjustment spring 96. As a result, the movable caster 7
1a is moved upward by the interlocking of the cam 91, the rod 93, and the lift member 94, so that only the adjuster 8 and the fixed casters 7b are in the fixed state of FIG. At this time, the pin 54 moves between both ends of the notch 52b, and comes into contact with the end that was in contact before the movable caster 7a was lowered.

As described above, this mobile desk 1 is disclosed in
In the same manner as the mobile desk described in Japanese Patent No.
In the fixed state in which the movement of the movable table 1 is prevented, only the adjuster 8 and the fixed caster 7b are in contact with the floor, and in the movable state in which the mobile desk 1 is movable, only the movable caster 7a and the fixed caster 7b are in contact with the floor. It has a structure to do.

However, in the mobile desk 1, the movable caster 7a is disposed below the fixed foot 60 between the adjuster 8 which does not move up and down and the fixed caster 7b.
The lift member 94 can be located near the center of the fixed foot 60. As a result, the height at both ends of the fixed foot 60 is lower than that of the mobile desk described in Japanese Patent Application Laid-Open No. 9-294633, and does not interfere with the feet of the user.

The mobile desk 1 has a cam 91 connected to a rotating shaft of a shelf guide 52 having a top plate 4 and a parallel link mechanism, and a rod 93 whose upper end is pivotally supported at an end of the cam 91.
And a lift member 9 pivotally supported by the lower end of the rod 93 and the fixed foot 60 and having a movable caster 7a at the lower front portion.
4, the movable casters 7 a can be moved up and down only by rotating the top plate 4.

Then, the movable caster 7a is pushed down only by the spring force of the movable caster 7a by the elevating mechanism 90. Japanese Patent Laid-Open No. 9-294633 and Japanese Utility Model Publication No. 5-1795.
Compared to the technology described in Japanese Patent Publication No. 3 (1993), it is firmly pushed down on the floor and does not swing back and forth.

Further, in the mobile desk 1, even when the top plate 4 and the shelf guide 52 remain substantially horizontal, only the operation lever 95 connected to the rotation shaft of the cam 91 is rotated. Thus, the movable caster 7a can be moved up and down.
Further, since protective covers 63a and 63b are provided on the front, rear, left and right side surfaces of the fixed foot 60,
In the case where collides with a wall or the like, or when the shoe tip of the user hits the fixed foot 60, the bumper serves as a bumper for absorbing impact.

As described above, as one embodiment to which the present invention is applied,
Although the mobile desk 1 has been described, the present invention is not limited to the above embodiment, and can be implemented in various modes. For example, in the above embodiment, the positions of the movable casters 7a and the adjusters 8 may be interchanged, and the adjusters 8 that are movable parts may be arranged between the casters 7a and 7b before and after not moving up and down. In this case, for example, if the following mechanism change is performed, the same effect as the above embodiment can be obtained.

First, when the top plate 4 and the shelf guide 52 are in a substantially horizontal fixed state, the connecting portion of the cam 91 with the rod 93 faces downward, and the adjuster 8 is positioned below the front and rear casters 7a and 7b. I do. Then, the mobile desk 1 in this state tilts rearward, and only the adjuster 8 and the rear casters 7b are in contact with the floor. At this time, the front end of the fixed foot 60 is slightly higher than the rear end. However, since the user of the mobile desk 1 places the chair behind the mobile desk 1, the height of the fixed foot 60 near the user's foot is low, and there is no trouble such that the fixed foot 60 obstructs the foot. .

The casters 7a, 7
When switching to a movable state in which only b contacts the floor, the top plate 4 and the shelf guide 52 are turned counterclockwise to be in a state parallel to the standing leg 2 or the operation lever 95 is set to the above-mentioned top plate. 4 and the shelf guide 52 are rotated counterclockwise by the same angle. In any case, the rod 93 of the cam 91
Is connected to the rear, and the rod 93 is moved upward. As a result, the adjuster 8 is connected to the front and rear casters 7a, 7a.
b, the front and rear casters 7a,
Only 7b is grounded.

On the other hand, as a mechanism for interlocking the rotation of the cam 91 with the rotation of the top plate 4, a gear mechanism may be provided between the top plate rotation axis and the cam 91 rotation axis. Alternatively, the cam 91 may be provided directly on the top plate rotating shaft. Further, a gear mechanism may be provided between the shelf pipe 51 and the rotating shaft of the cam 91.

Further, it is not necessary to provide the fixed feet 60 at the lower ends of the left and right standing legs 2 as in the above embodiment. For example,
A fixed foot 60 provided with casters 7a, 7b and an adjuster 8 at a lower portion is provided only at one lower end of the left and right standing legs 2,
Only the casters may be directly provided at the lower end of the other standing leg 2. Further, a housing having at least one or more drawers may be provided on the other standing leg 2, and a caster may be provided at a lower portion of the housing. When the mobile unit 1 is provided with a shelf 50, the other standing leg 2 is provided with a cam shaft rod 92 and an operation lever 9 to support the shelf 50.
5, and only the fine adjustment spring 96 may be provided.

Further, it is not necessary to limit the number of casters 7a, 7b at the front and rear of the lower portion of the fixed foot 60 to one.
It may be two or more each.

[Brief description of the drawings]

FIG. 1 is a side view of a mobile desk 1 according to an embodiment.

FIG. 2 is an exploded perspective view showing an elevating mechanism 90 of the movable caster 7a.

FIG. 3 is a sectional view taken along line A-A 'of FIG.

FIG. 4 is a side view showing the mobile desk 1 in a state where only the casters 7a and 7b are in contact with the floor surface by the rotation of the top plate 4.

FIG. 5 is a perspective view of the caster 7 when the operation lever 95 is turned.
It is a side view showing mobile desk 1 in the state where only a and 7b were in contact with the floor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mobile desk 2 ... Standing stand 4 ... Top plate 7a, 7b ... Caster 8 ... Adjuster 30 ... Top plate support part 60 ... Fixed foot 63a, 63b ... Protective cover 90 ... Elevating mechanism 91 ...
Cam 93 ... Rod 94 ... Lift member 95 ... Operation lever

Claims (5)

[Claims] 1. A top plate, a pair of uprights provided on both left and right sides of the top plate for supporting the top plate, and a width provided in a front-rear direction at a lower end of at least one of the pair of uprights. Fixed feet provided, a pair of casters provided at least one at a lower portion of the front and back of the fixed feet, a contact portion provided at the lower portion of the fixed feet, provided along the standing leg, An elevating mechanism that raises and lowers the movable part by an external operation by using any one of the three elements including the pair of casters and the contact part as a movable part. By moving up and down, the contact portion is located relatively below one of the front and rear casters and grounds on the floor surface,
A fixed state for preventing movement of the mobile desk, and the contact portion is positioned relatively higher than one of the front and rear casters, and only the casters are in contact with the floor surface, whereby the movement is performed. A movable state capable of moving the desk; and a movable desk that can be set to any one of the following. A mobile desk characterized by being arranged between. 2. The top plate is provided on the upright via a top plate support portion so as to be rotatable about a left-right direction, and the elevating mechanism is interlocked with the rotation of the top plate. A cam that is rotated about an axis parallel to the axis of rotation, and a rod that is a rod-shaped member that is pivotally supported by the end of the cam and that is disposed substantially vertically along the standing leg. The mobile desk according to claim 1, wherein the movable portion is connected to an end of the rod opposite to the cam. 3. An elongate lift member having one end pivotally supported by an end of the rod opposite to the cam and the other end pivotally supported by the fixed foot. 3. The lift member is disposed below a portion of the lift supported by the rod.
The mobile desk described in. 4. The cam is rotated by an external operation on the rotation axis of the cam regardless of the rotation of the top plate,
4. The mobile desk according to claim 2, further comprising an operation lever for moving the movable unit up and down. 5. The mobile desk according to claim 1, wherein the fixed foot is provided with a protective cover for absorbing a shock applied from a side surface to a lower surface of the fixed foot.