Mobile support stand

Abstract

To provide a movable-type support base that is small in work burden, which enables a caster on a bottom surface to appear and disappear just by tilting the caster, without additionally performing special operation, when the base is moved and fixed.SOLUTION: In a movable-type support base 1, a lifting mechanism using a cam having two parallel opposing long sides and two opposing short sides having V-shaped notches formed therein is provided at a connecting part between a base column 23 erected at a base part 2 and a lifting column 31 inserted into the base column 23 to support an outer shell body 33. When the lifting mechanism tilts the movable-type support base 1 in a fixed state and then returns the base to an upright posture, a lifting part 3 stops at a position ascended with respect to the base part 2, so that the support base is brought into a movable state where casters 21 protrude lower than the outer shell body 33. Further, when the lifting mechanism tilts the movable-type support base 1 in the movable state and then returns the support base to the upright posture, the lifting part 3 moves down, so that the outer shell body 33 is grounded and the support base is brought into the fixed state.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The invention disclosed in the present application relates to a multi-purpose type of mobile support base.

Background Art

[0002] For example, as an obstacle for regulating the passage of vehicles and pedestrians, or as a bench, a guide display board, or other street furniture, a multi-purpose type of support base installed on the ground surface of various facilities or the road surface is known. Such a support base is generally formed to a height of about several tens of centimeters and is used either individually installed at an arbitrary location or in a manner where a plurality of them are arranged at appropriate intervals to span a bar or a chain. Such a support base is formed to a weight of about several tens of kilograms so as not to easily fall due to impact or wind pressure or be moved arbitrarily by an unrelated third party, and stabilization during installation is achieved.

[0003] This type of support base is not permanently fixed in place but is placed at an arbitrary location as needed. Therefore, when it becomes unnecessary or the placement location needs to be changed, it is required to be easily movable. However, it is extremely difficult for a person to lift and carry a support base that weighs several tens of kilograms individually. Therefore, in order to achieve both stability during installation and ease of movement, a support base has been proposed in, for example, Patent Documents 1 and 2, etc., which is equipped with casters that can be retracted and extended on the bottom surface and can be easily moved by grounding the casters during movement.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The mobile support bases disclosed in Patent Document 1 and Patent Document 2 have an outer housing (referred to as a "housing member" in Patent Document 1 and a "support base frame" in Patent Document 2) attached to the upper part of a base portion (referred to as a "caster support member" in Patent Documents 1 and 2) to which casters for movement are attached, such that the outer housing can move up and down. When moving and installing (fixing), the outer housing is slightly lifted by hand or tilted slightly, and an operating pin provided on the side surface of the outer housing is pushed inward to switch the protrusion and retraction of the casters. Therefore, when taking out or storing the casters, it is necessary to simultaneously perform the operation of lifting or tilting the heavy outer housing and the operation of pushing in the operating pin with one hand, which imposes a great burden on the operator.

[0006] The invention disclosed in the present application is conceived to reduce the working burden during movement and installation as described above, and proposes a mobile support base equipped with a reasonable mechanism that can make the casters on the bottom surface protrude and retract without any special operation other than tilting the outer housing.

Means for Solving the Problems

[0007] In order to achieve the above object, the invention disclosed in the present application includes a base portion with a plurality of casters attached to the bottom surface, and a lifting portion that is held on the base portion so as to be able to move up and down. In the mobile support base in which the lifting portion is coupled with an outer housing that surrounds the entire base portion and grounds the bottom edge portion when the lifting portion descends, a base column for supporting the lifting portion is erected on the base portion, and the lifting portion is provided with a lifting column that is coaxially inserted into and removable from the base column. A lifting mechanism using a cam is provided at the engaging portion between the base column and the lifting column. When the mobile support base in a stationary state is tilted and then returned to an upright position, the lifting portion stops at a position raised relative to the base portion, so that the casters protrude below the outer housing to enter a movable state. When the mobile support base in a movable state is tilted and then returned to an upright position, the lifting portion descends and the outer housing touches the ground to enter a stationary state.

[0008] Furthermore, as a more specific configuration, on the base column of the movable support base, a cam having two parallel linear opposing long sides and two opposing short sides with a V-shaped cut portion formed thereon is rotatably axially mounted via a support shaft member arranged in a direction perpendicular to the axis of the base column. On the lifting column, when the lifting column is in the lowered position, there is a vertical guide edge that abuts against one long side of the cam to hold the cam in a vertical posture, and when the lifting column rises relative to the base column, there is a pushing-up piece that pushes up the cam from below to tilt the cam by a predetermined angle. When the lifting column descends from the raised position, there is an engaging piece that engages with the cut portion of the tilted cam from above to restrict the rotation of the cam. When the movable support base in the stationary state is tilted to raise the lifting portion relative to the base portion, the cam is pushed up by the pushing-up piece and rotates. When the tilted movable support base is returned to the upright posture, the engaging piece engages with the cut portion and the rotation of the cam is restricted, so that the lifting portion stops at the raised position. When the movable support base in the movable state is tilted, the engagement of the engaging piece with the cam is released and the cam becomes rotatable. When the tilted movable support base is returned to the upright posture, the cam assumes a vertical posture and the lifting portion descends. The following configuration is adopted.

[0009] In the movable support base, a vertically elongated hole is formed in the lifting column, and the lifting column is inserted outside the base column with the support shaft member loosely inserted into the vertically elongated hole. A cam rail surrounding the vertically elongated hole in a frame shape is attached to the side surface of the lifting column, and the cam is rotatably housed within the frame of the cam rail. At the same time, the vertical guide edge, the pushing-up piece, and the engaging piece are formed on the inner peripheral edge of the cam rail. This configuration can be adopted.

[0010] Also, in the movable support base, it is more preferable that cam reverse rotation preventing means for restricting the rotation direction of the cam is provided so that the cam rotates only in one direction regardless of the tilting direction when the movable support base in the stationary state is tilted and when the movable support base in the movable state is tilted.

[0011] The cam reverse prevention means can preferably adopt a ratchet mechanism including a pawl wheel that rotates integrally with the cam, and a swing lever pivotally mounted in the vicinity of the pawl wheel and having a stop pawl that engages with the pawl wheel.

Effects of the Invention

[0012] The movable support base configured as described above is configured such that the casters can be made to protrude and retract below the outer housing simply by tilting the movable support base itself once and then returning it to the upright position. Therefore, the work of placing the movable support base at a desired location or moving it becomes easy, and the burden on the operator is greatly reduced.

[0013] Furthermore, when a lifting mechanism is adopted in which a cam having two parallel linear opposing long sides and two opposing short sides formed with a V-shaped cut is engaged and disengaged with vertical guide edges, protruding pieces, and engaging pieces arranged around the cam, smooth and highly reliable operability can be obtained, and the mechanism can also be accommodated compactly.

[0014] Also, when cam reverse prevention means for restricting the rotation of the cam in one direction is provided, no matter in which direction the movable support base is tilted, the cam can be surely rotated in a predetermined engagement and disengagement direction without irregularly swinging due to its own weight, and more reliable operability can be obtained.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying out the Invention

[0016] Hereinafter, embodiments of the invention disclosed in the present application will be described with reference to the drawings.

[0017] FIGS. 1 to 7 show a movable support base 1 according to an embodiment of the invention disclosed in the present application. This movable support base 1 has a substantially cylindrical shape with an overall height of about several tens of cm. Structurally, it is roughly divided into a base portion 2 with casters 21 for movement attached to the bottom surface, and a lifting portion 3 supported so as to be able to move up and down with respect to the base portion 2.

[0018] The base portion 2 includes a substantially disk-shaped base bottom plate 22, and about 4 to 5 casters 21 are attached to the lower surface thereof. All the casters 21 in the exemplary embodiment are swivel casters. In the center of the upper surface of the base bottom plate 22, a base column 23 for supporting the lifting portion 3 is erected. The base column 23 in the exemplary embodiment is a square tube-shaped hollow material, but this may also be a solid material.

[0019] On the other hand, the lifting portion 3 includes a lifting column 31 coaxially inserted into the base column 23 so as to be freely inserted and removed, and an outer shell 33 coupled to the lifting column 31 via an appropriate support frame 32. For the lifting column 31 in the exemplary embodiment, a square tube-shaped hollow material that can be inserted outside the base column 23 is used.

[0020] The outer shell 33 has a substantially cylindrical side surface portion 34 and a top surface portion 35 on a gently bulging spherical surface. The entire bottom surface is open, and its bottom edge portion 36 is formed to be in contact with the ground and cover the entire base portion 2. An appropriate protective material (not shown) for protecting the bottom edge portion 36 when it touches the ground may be attached to the bottom edge portion 36. In the vicinity of the upper part of the side surface portion 34, upper and lower two-stage annular recesses 37 are formed as a design shape that also serves as a handhold during movement and stationary operation.

[0021] Note that the shape of the outer housing 33 is not particularly limited in the invention disclosed in the present application. Therefore, as long as the bottom edge 36 of the outer housing 33 can be grounded, the cross-sectional shape may be a quadrilateral or other polygon, and the side shape may be a conical shape or a frustum shape. The shape of the top surface portion 35 and the design shape of the side surface portion 34 including the finger hook are also arbitrary. A shape like a small-diameter columnar body erected on a large-diameter pedestal portion can also be adopted. However, as will be described later, since the mobile support base 1 is configured to be tilted as a whole when moving and stationary, it is at least easier to handle if it is designed so that the overall height is larger than the lateral width (maximum diameter), preferably in a proportion of about 1.5 to 3 times the lateral width.

[0022] The elevating portion 3 is held so as to move up and down by about several centimeters (practically preferably 2 cm to 4 cm) with respect to the base column 23 by the action of an elevating mechanism provided at the joining portion of the base column 23 and the elevating column 31. The detailed specific configuration of this elevating mechanism is shown in FIGS. 3 to 5, and its operation is shown in FIGS. 6 and 7. Note that the elevating mechanism is provided so as to be mirror-symmetrical on the two opposing side surfaces of the base column 23 and the elevating column 31 and operates synchronously on both side surfaces. However, for convenience in the following description, the surface shown in FIG. 3 is regarded as the front, and the positional relationship and the direction of movement of up, down, left, and right are specified based on this front.

[0023] A cam 4 is axially attached to the base column 23 via a single support shaft member 24 arranged in a direction orthogonal to the axis thereof. The support shaft member 24 in the exemplary embodiment is a straight rod-shaped pin that penetrates the base column 23 and protrudes from the two opposing side surfaces of the base column 23, and a retaining pin, a retaining ring, etc. (not shown) are attached in the vicinity of both ends thereof to prevent it from coming off.

[0024] The cam 4 is a member made of a metal plate with a uniform thickness, having two parallel linear opposing long sides 41, and substantially V-shaped cutouts 42 are formed on the two opposing short sides connecting them. As a whole, it has a shape that is line-symmetric about the major axis center line and the minor axis center line, and a support shaft member 24 is attached to its center. The ratio of the short side dimension to the long side dimension of the cam 4 in the exemplary embodiment is about 1:2, and the inner angle of the cutout 42 is about 90 degrees. The peripheral portion of the cam 4 is smoothly finished, and rounded processing with substantially equal diameters is performed at the four corners. Two of these cams 4 are rotatably attached near both ends of the support shaft member 24 with the base pillar 23 interposed therebetween.

[0025] On the other hand, vertical long holes 38 are formed on two opposing side surfaces of the lifting column 31. The lifting column 31 is inserted onto the outside of the base pillar 23 by loosely inserting a support shaft member 24 protruding from the side surface of the base pillar 23 into the vertical long holes 38. That is, after inserting the lifting column 31 into the base pillar 23, the support shaft member 24 is attached so as to penetrate them, and the aforementioned cam 4 is further attached to the outside thereof. The lifting stroke of the lifting column 31 is defined by the length of the vertical long holes 38. It is more preferable that the contact friction with the lifting column 31 is reduced, such as by stretching a lubricating resin sheet (not shown) on the side surface of the base pillar 23, so that the lifting operation becomes smooth.

[0026] A cam rail 5 is further attached to the side surface of the lifting column 31. The cam rail 5 in the exemplary embodiment is a member formed by bending a metal plate having substantially the same thickness as the cam 4 into a substantially U-shaped in top view, with a large opening in a frame shape at its central portion. It is overlapped on the side surface of the lifting column 31 so as to surround the vertical long holes 38 and the cam 4 with the opening, and is fixed to the lifting column 31 with fixing screws 51. The two bent vertical edge portions 52 face outward of the lifting column 31. Cam rails 5 with openings in a mirror-symmetric shape are also attached to the opposing side surfaces of the lifting column 31.

[0027] On the inner peripheral edge of the cam rail 5 with an opening in a frame shape, a vertical guide edge 53, a protruding piece 54, and an engaging piece 55 that engage and disengage with the peripheral edge of the cam 4 are formed one by one according to the rotational posture of the cam 4.

[0028] The vertical guide edge 53 is a linear portion extending in the vertical direction, formed at the upper left of the vertically long hole 38 in FIG. 3. When the lifting column 31 is in the lowered position shown in FIG. 3 (when the support shaft member 24 is located near the upper end of the vertically long hole 38), the vertical guide edge 53 gently abuts against the left long side 41 of the cam 4 and functions to hold the cam 4 in a vertical posture (a posture in which the long side 41 stands upright).

[0029] The protruding piece 54 is a substantially V-shaped portion protruding upward, formed slightly to the right below the vertically long hole 38 in FIG. 3. As shown in FIG. 6(b), when the lifting column 31 ascends (when the support shaft member 24 approaches the lower end of the vertically long hole 38), the protruding piece 54 pushes up the right side of the lower cut portion 42 of the cam 4 in the vertical posture and functions to tilt the cam 4 counterclockwise as shown in the figure.

[0030] The engaging piece 55 is a corner-like portion continuous from the vertical guide edge 53, formed to the left near the midpoint of the vertically long hole 38 in FIG. 3. As shown in FIG. 6(c), when the lifting column 31 descends slightly from the position where it has ascended the most, the engaging piece 55 engages with the upper cut portion 42 while further tilting the cam 4 and functions to restrain the cam 4 from rotating at that position.

[0031] In addition, the shape of the portion of the inner peripheral edge of the cam rail 5 other than the above three locations is not particularly limited as long as it does not prevent the rotation of the cam 4. Therefore, the cam rail 5 may be, for example, in a form combining a plurality of portions where the inner peripheral edge is not continuously framed.

[0032] Further outside the cam rail 5, there is provided a cam reverse prevention means 6 for regulating the rotation direction of the cam 4 so that it can only rotate in one direction. As shown in FIG. 3, the cam reverse prevention means 6 of the exemplary embodiment includes a ratchet plate 61 attached to the outside of the cam rail 5 with a support shaft member 24 loosely inserted, a pawl wheel 63 coaxially coupled to the cam 4 via a shaft collar 62 through which the support shaft member 24 is loosely inserted and rotating integrally with the cam 4, and a swing lever 65 pivotally attached via a pin 64 near the pawl wheel 63 on the ratchet plate 61. A retaining pawl 66 for engaging with the pawl wheel 63 is formed on the swing lever 65, and when the retaining pawl 66 engages with the pawl wheel 63, the cam 4 is restricted so that it can only rotate counterclockwise as shown in the figure. The ratchet plate 61 is held in a state where both side edges are sandwiched between the two vertical edges 52 of the cam rail with a minute gap therebetween so as not to rotate together with the cam 4 and the pawl wheel 63 and not to interfere with the raising and lowering of the cam rail.

[0033] The operation method of the movable support base 1 and the operation of the lifting mechanism configured as described above will be described again with reference to FIG. 2, FIG. 6, and FIG. 7. The states (a) to (d) shown in FIG. 2 are consistent with the states (a) to (d) shown in FIGS. 6 and 7. Note that the cam reverse prevention means 6 is not shown in FIGS. 6 and 7 in order to make the posture of the cam 4 easier to see.

[0034] FIG. 2(a) and FIG. 6(a) show a stationary state where the lifting part 3 has descended and both the bottom edge 36 of the outer housing 33 and the caster 21 of the base part 2 are in contact with the ground. At this time, the support shaft member 24 attached to the base column 23 is located near the upper end of the vertically long hole 38 formed in the lifting column 31, and the cam 4 is held in a vertical posture with the long side 41 along the vertical guide edge 53 of the cam rail 5.

[0035] Figures 2(b) and 6(b) show the state where the mobile support base 1 in the stationary state is tilted. When the entire mobile support base 1 is tilted with the bottom edge 36 of the outer housing 33 grounded, the base portion 2 inside the grounded portion slides down while some of the casters 21 remain grounded, so that the lifting portion 3 relatively rises with respect to the base portion 2. This lifting height is set to about 3 cm. Then, the protruding piece 54 of the cam rail 5 attached to the lifting column 31 pushes up the lower cut portion 42 of the cam 4, tilting the cam 4 counterclockwise as shown in the figure. If a swivel caster is adopted for the caster 21, no matter which direction the mobile support base 1 is tilted, the wheels of the swivel caster escape to the side away from the grounded portion of the outer housing 33, so that the lifting height of the lifting portion 3 can be obtained at a small tilting angle.

[0036] Figures 2(c) and 6(c) show the state where the tilted mobile support base 1 is returned to the upright position. When the mobile support base 1 is made upright by placing the weight of the mobile support base 1 on some of the grounded casters 21, the lifting portion 3 descends due to its own weight, and the engaging piece 55 of the cam rail 5 contacts the upper cut portion 42 of the tilted cam 4 from above, engages with the cut portion 42 while further tilting the cam 4, and restrains the cam 4 from rotating. As a result, the lifting portion 3 stops at a position higher than the stationary state, and the casters 21 protrude below the bottom edge 36 of the outer housing 33 to be in a movable state. The descent stroke from the position in Fig. 6(b) to the position in Fig. 6(c) is about several millimeters.

[0037] Figure 7(c) shows the same movable state as Figure 6(c). Figures 2(d) and 7(d) show the state where the movable support base 1 in the movable state is tilted again at the place where it is desired to be fixed. When the movable support base 1 is tilted until the bottom edge 36 of the outer housing 33 touches the ground, the base portion 2 slides down slightly while some of the casters 21 are in contact with the ground, and the lifting portion 3 rises about several millimeters with respect to the base portion 2. Then, the protruding piece 54 of the cam rail 5 attached to the lifting column 31 pushes up the lower long side 41 of the cam 4, tilting the cam 4 counterclockwise as shown in the figure. At this time, the engaging piece 55 engaged with the cutout portion 42 of the cam 4 also rises and disengages from the cutout portion 42, so that the cam 4 becomes rotatable.

[0038] When the movable support base 1 is returned to the upright position with the engagement of the cam 4 released, as shown in Figure 7(e), the lifting portion 3 descends due to its own weight, and the engaging piece 55 of the cam rail 5 pushes down the upper long side 41 of the cam 4. Then, the cam 4 rotates further counterclockwise, and as shown in Figure 7(a), it returns to the vertical position with the long side 41 along the vertical guide edge 53 of the descending cam rail 5. The descent of the lifting portion 3 stops when the bottom edge 36 of the outer housing 33 touches the ground. Figure 7(a) shows the fixed state where the casters 21 are housed inside the outer housing 33, similar to Figures 2(a) and 6(a). At this time, the cam 4 has rotated 180 degrees and is in an upside-down posture, as indicated by the black circles in Figures 6 and 7.

[0039] In this way, the movable support base 1 disclosed in the present application can easily make the casters 21 appear and disappear below the outer housing 33 with a very simple operation of simply tilting the entire movable support base 1 once with the bottom edge 36 of the outer housing 33 touching the ground and then raising it again. That is, there is no need to perform other operations such as pressing pins, buttons, or turning levers while tilting the outer housing 33. Therefore, even if the weight of the outer housing 33 is large, the fixing and moving of the movable support base 1 can be easily performed without imposing a large burden on the operator.

[0040] The lifting mechanism is simply and reasonably configured, which is advantageous for compactification, has high operating reliability, and is easy to maintain. By providing the cam reverse prevention means 6 for restricting the rotation of the cam 4 in one direction, no matter in which direction the movable support base 1 is tilted, the cam 4 can be surely rotated in a predetermined engaging and disengaging direction without irregularly swinging due to its own weight. Further, since there is no need to provide operating parts such as buttons and levers on the side surface portion 34 and the top surface portion 35 of the outer housing 33, the appearance design of the outer housing 33 can be neatly finished. With a higher degree of freedom in the appearance design, a design that harmonizes with the installation environment can also be appropriately adopted. Furthermore, since no buttons or levers appear on the outer housing 33, it becomes difficult for outsiders to imagine the internal structure and operation method, enhancing the effect of preventing mischief.

[0041] It should be noted that the technical scope of the invention disclosed in this application should not be construed in a limited manner by the exemplified embodiments, but should be conceptually construed based on the description in the claims. When implementing the invention disclosed in this application, details such as the specific shape, dimensions, structure, material, quantity, form of combination with other elements, relative positional relationship, etc. of the components not specifically specified in the claims can be appropriately modified within the scope of using the operating principle substantially equivalent to the exemplified embodiments.

[0042] For example, in the foregoing embodiment, the lifting mechanism is provided on the two opposite side surfaces of the mating portion between the base column 23 and the lifting column 31, but it may be provided only on one side surface. The cam 4 constituting the lifting mechanism and the vertical guide edge 53, the protruding piece 54, and the engaging piece 55 that engage with and disengage from the cam 4 may be incorporated with an appropriate gap provided between the base column 23 and the lifting column 31, or may be incorporated inside the base column 23 made of a hollow material. Further, the base column 23 and the lifting column 31 may be inserted in opposite inner and outer directions. The vertical guide edge 53, the protruding piece 54, and the engaging piece 55 that engage with and disengage from the peripheral edge of the cam 4 may be constituted by pin-shaped members instead of plate pieces.

[0043] Furthermore, the cross-sectional shape of the entire movable support base 1 may be a shape extending in one direction, such as a rectangle or an ellipse, and a plurality of base columns 23 and lifting columns 31 coaxially inserted into each of them may be provided on the long axis center line thereof. When the entire movable support base 1 is tilted in the short side direction, the plurality of lifting columns 31 may be configured to move up and down simultaneously.

Industrial Applicability

[0044] This movable support base 1 can be installed as needed on the site areas and road surfaces of various facilities, for example, as an obstacle for restricting the passage of vehicles or pedestrians, or as a bench, a guide display board, or other street furniture. In addition, it can also be used in various fields such as mechanical equipment and furniture as a means for making a heavy object installed on a substantially flat surface movable.

Explanation of Reference Numerals

[0045] 1 Movable support base 2 Base part 21 Caster 22 Base bottom plate 23 Base column 24 Support shaft member 3 Lifting part 31 Lifting column 32 Support frame 33 Outer housing 34 Side part 35 Top part 36 Bottom edge part 37 Annular recess 38 Vertically long hole 4 Cam 41 Long side 42 Cut-in part (short side) 5 Cam rail 51 Fixing screw 52 Vertical edge part 53 Vertical guide edge 54 Protruding piece 55 Engaging piece 6 Cam reverse prevention means 61 Ratchet plate 62 Shaft collar 63 Pawl wheel 64 pins 65 swing lever 66 detent pawl

Claims

1. A mobile support stand comprising a base portion with a plurality of casters attached to the bottom surface, and a lifting portion that is held on the base portion so as to be movable up and down, wherein in the lifting portion, a mobile support stand to which an outer housing is coupled that surrounds the entire base portion and grounds the bottom edge portion when the lifting portion descends, the base portion includes a base plate and base columns erected on the upper surface of the base plate to support the lifting portion, the lifting portion is provided with a lifting column that is coaxially inserted into the base column so as to be insertable and removable, at the mating portion between the base column and the lifting column, a lifting mechanism is provided that includes a cam that rotates along the side surfaces of the base column and the lifting column, and three portions that engage and disengage with the periphery of the cam according to the rotational posture of the cam, when the mobile support stand in a stationary state is tilted and then returned to an upright posture, the cam is constrained in a predetermined posture, and the lifting portion stops at a position raised relative to the base portion, so that the casters protrude below the outer housing to enter a movable state, when the mobile support stand in a movable state is tilted and then returned to an upright posture, the cam rotates and the lifting portion descends, and the outer housing contacts the ground to enter a stationary state, characterized in that it is configured as described above. A mobile support stand.

2. In the mobile support stand according to Claim 1, a cam having two parallel linear opposing long sides and two opposing short sides with a V-shaped cut portion formed thereon is rotatably axially mounted on the base column via a support shaft member arranged in a direction perpendicular to the axis of the base column, while in the lifting column, as the three portions, a vertical guide edge that contacts one long side of the cam and holds the cam in a vertical posture when the lifting column is in the lowered position, a pushing-up piece that pushes up the cam from below and tilts the cam by a predetermined angle when the lifting column rises relative to the base column, an engaging piece that engages with the cut portion of the tilted cam from above and restrains the rotation of the cam when the lifting column descends from the raised position, are provided, when the mobile support stand in a stationary state is tilted to raise the lifting portion relative to the base portion, the cam is pushed up by the pushing-up piece and rotates, when the tilted mobile support stand is returned to an upright posture, the engaging piece engages with the cut portion to restrain the rotation of the cam, so that the lifting portion stops at the raised position. When the movable support base in the movable state is tilted, the engagement of the engagement piece with the cam is released and the cam becomes rotatable. When the tilted movable support base is returned to the upright position, the cam assumes a vertical posture and the elevating part descends. A movable support base characterized by the above.

3. In the movable support base according to Claim 2, A vertically long hole is formed in the elevating column, The elevating column is inserted outside the base column with the support shaft member loosely inserted into the vertically long hole, A cam rail surrounding the vertically long hole in a frame shape is attached to the side surface of the elevating column, The cam is rotatably housed within the frame of the cam rail, The vertical guide edge, the protruding piece, and the engagement piece are formed on the inner peripheral edge of the cam rail. A movable support base characterized by the above.

4. In the movable support base according to Claim 1, 2, or 3, When the movable support base in the stationary state is tilted and when the movable support base in the movable state is tilted, in either case, cam reverse rotation prevention means for restricting the rotation direction so that the cam rotates only in one direction regardless of the tilting direction is provided. A movable support base characterized by the above.

5. In the movable support base according to Claim 4, The cam reverse rotation prevention means is a ratchet mechanism including a pawl wheel that rotates integrally with the cam, and a swing lever pivotally attached in the vicinity of the pawl wheel and having a stop pawl that engages with the pawl wheel. A movable support base characterized by the above.

Images