JP7635959B2 - Tilt prevention device - Google Patents

Description

The present invention relates to a tilt prevention device.

Work platforms for working at height have been known for some time.

JP 2011-84944 A

When a user stands on such a work platform to perform work at a height, there is a problem that the work efficiency cannot be improved if the work platform tilts.
The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a tipping prevention device that prevents a workbench from tipping over.

The present invention is an anti-tip device comprising a detachable part that can be attached and detached to a workbench, legs extending from the detachable part toward a ground surface, and a ground contact part connected to the legs, wherein the ground contact part has a seat portion that, when placed on the ground surface, has a shape in a planar view in which a long shape extending along one direction parallel to the ground surface intersects with a long shape extending along a direction different from the one direction .

This invention makes it possible to prevent the workbench from tipping over.

FIG. 1 is a front view showing an example of the configuration of a portable workbench equipped with a tipping prevention device. FIG. 1 is a side view showing an example of the configuration of a portable workbench equipped with a tipping prevention device. FIG. 1 is a plan view showing an example of the configuration of a portable workbench equipped with a tipping prevention device. FIG. 13 is a perspective view showing an example of a configuration of a tipping prevention device. FIG. 13 is a diagram showing an example of the configuration of a tilt prevention tool. FIG. 4 is a diagram illustrating an example of a configuration of a ground portion.

Hereinafter, the tipping prevention device 10 according to this embodiment and the portable workbench 100 to which the tipping prevention device 10 is attached will be described with reference to the drawings.
Fig. 1 is a front view showing an example of the configuration of a portable work platform 100 equipped with a tipping prevention device 10. Fig. 2 is a side view showing an example of the configuration of a portable work platform 100 equipped with a tipping prevention device 10. Fig. 3 is a plan view showing an example of the configuration of a portable work platform 100 equipped with a tipping prevention device 10. For ease of explanation, in each figure, the front side is indicated as Fr, the rear side as Rr, the right side as R, and the left side as L, as necessary.

First, the portable workbench 100 will be described.
The portable work platform 100 is a work platform for a worker to work at height. The portable work platform 100 of this embodiment (hereinafter referred to as the work platform 100) is assumed to have a height of, for example, about 620 mm to about 1910 mm from the floor surface to a top plate portion 110 described later.
The workbench 100 has a top panel portion 110 , legs 130 , an enclosure portion 140 , a rotating portion 150 , and a rotation restricting portion 160 .

The top plate portion 110 functions as a foothold for workers working at height. The top plate portion 110 is rectangular in shape with the longitudinal direction being the front-rear direction and the transverse direction being the short side direction in a plan view. The length in the front-rear direction is, for example, approximately 1500 mm, and the length in the transverse direction is, for example, approximately 500 mm. The top plate portion 110 is formed by connecting a plurality of long top plate members. Each top plate member is, for example, made of an aluminum alloy, and is formed by extrusion molding.
The top plate portion 110 has a plurality of projections 112 as anti-slip surfaces on the upper surface, which serves as a work surface (see FIG. 3). The projections 112 are formed at intervals across the entire surface of the top plate portion 110. The projections 112 protrude upward and have a hole formed in the center.
The top plate 110 also has a plurality of (here, two) insertion holes 113 at each of the right and left ends for attaching the tilt prevention device 10 (see FIG. 3 and FIG. 4 described later). The insertion holes 113 are holes that penetrate the top plate 110 in the vertical direction. The insertion holes 113 correspond to an example of a detachable portion.

The legs 130 have a function of supporting the weight of the top plate 110 and the weight of a worker working on the top plate 110. The legs 130 are connected to the front and rear ends of the top plate 110 and are rotatable relative to the top plate 110. When the legs 130 rotate, the legs 130 are folded so as to overlap the top plate 110.
Specifically, the leg section 130 has a pair of legs 131A and 131B. The leg 131A is located at the rear in the front-rear direction and extends from the top plate section 110 toward the floor surface. The leg 131B is located at the front-rear direction of the top plate section 110 and extends from the top plate section 110 toward the floor surface. As shown in FIG. 1, the leg 131A and the leg 131B face each other at positions separated in the front-rear direction and are inclined so as to move away from each other toward the lower end. The leg 131A and the leg 131B are so-called ladder-shaped, and allow the worker to ascend and descend between the top plate section 110 and the floor surface.

The leg body 131A has leg members 132a and 132b and multiple cross members 138a to 138d (see FIG. 2). The leg members 132a and 132b are located at both ends in the left-right direction of the tabletop portion 110. The leg members 132a and 132b face each other with a gap between them in the left-right direction, and are inclined so as to move away from each other toward the bottom end.
Each of the leg members 132 a and 132 b has a main leg 133 and an extendable leg 134 .
The main leg 133 is a main component of the leg members 132a and 132d. The main leg 133 is made of, for example, an aluminum alloy and is formed by extrusion molding. The main leg 133 is, for example, a hollow or solid member having a substantially rectangular cross section.

The telescopic leg 134 is a member that telescopically extends and retracts the leg members 132a and 132b along the longitudinal direction. The telescopic leg 134 fits inside the main leg 133 and can slide along the longitudinal direction of the main leg 133. The telescopic leg 134 is made of, for example, an aluminum alloy and is formed by extrusion molding. The telescopic leg 134 is, for example, a hollow or solid member with a substantially rectangular cross section that is a reduced cross section of the main leg 133. The telescopic leg 134 extends and retracts the length of the leg members 132a and 132b by changing the length that protrudes from the lower end of the main leg 133. In FIG. 1, the shortened state of the leg member 132a is shown by a two-dot chain line. The telescopic leg 134 also has a leg seat 135 at its lower end. The leg seat 135 is a member that stably grounds the lower ends of the leg members 132a and 132b on the ground surface. The leg seat 135 is, for example, made of soft synthetic resin.

The height position of the top plate 110 can be adjusted by extending and retracting the leg members 132a, 132b using the extendable legs 134. The workbench 100 of this embodiment can adjust the height position from the ground surface to the top plate 110 stepwise from H1 = approximately 1,350 mm to H2 = approximately 1,750 mm at intervals of, for example, a pitch P = approximately 67 mm in the height direction by a locking mechanism 136 described later (see FIG. 1). Also, the workbench 100 of this embodiment has an adjustment range R of the height position of the top plate 110 of R = approximately 400 mm from H2-H1.
The main leg 133 also has a locking mechanism 136. The locking mechanism 136 locks in stages the length that the extendable leg 134 projects from the lower ends of the leg members 132a and 132b. The locking mechanism 136 is attached to the opposing side surfaces of the leg members 132a and 132b.

The cross members 138a to 138d are so-called step bars on which an operator places his/her feet when ascending or descending. The cross members 138a to 138d are horizontally disposed between the main leg 133 of the leg member 132a and the main leg 133 of the leg member 132b. The cross members 138a to 138d can also improve the rigidity of the leg body 131A. The cross members 138a to 138d are made of, for example, an aluminum alloy, and are formed by extrusion molding.
Here, the leg 131A has been described, but the leg 131B has the same configuration, so it is given the same reference numerals and the description thereof is omitted.

The enclosure 140 has the function of surrounding the working area of the top plate 110. The enclosure 140 has pillars 141a-141d, a pair of long side rail members 142, and a pair of short side rail members 143. The pillars 141a-141d are arranged along the corners of the top plate 110 in a substantially vertical direction. The pillars 141a-141d are rotatably connected to the upper ends of the leg members 132a-132d, respectively. The pair of long side rail members 142 are bridged between the pillars 141a and 141c and between the pillars 141b and 141d on the upper side of the long side end of the outer periphery of the top plate 110. The long side rail members 142 are divided at substantially the center in the longitudinal direction and are rotatably connected to the upper ends of the pillars 141a-141d, respectively. A pair of short side rail members 143 are bridged between a pair of long side rail members 142 above the short end of the outer periphery of the top plate portion 110.

The enclosure 140 can move from a state in which the short-side rail member 143 is suspended across one of the long-side rail members 142 to a first state in which the short-side rail member 143 is aligned with the other long-side rail member 142. In the first state, the worker can move between the tabletop 110 and the legs 131A, or between the tabletop 110 and the legs 131B.
Moreover, the enclosure 140 can transition from the first state to a second state along the supports 141a to 141d by rotating each of the divided long side rail members 142. Furthermore, the enclosure 140 can transition from the second state to a third state along the leg members 132a to 132b by rotating each of the supports 141a to 141d. In the third state, the long side rail members 142 overlap with the main leg 133 in the left-right direction. In this way, by transitioning to the third state, when the leg body 131A and the leg body 131B are rotated to fold them relative to the top plate 110, the members constituting the enclosure 140, including the supports 141a to 141d, also rotate together with the leg body 131A and the leg body 131B.

The pivoting unit 150 has a function of pivoting the leg unit 130 relative to the top plate unit 110. By pivoting the leg unit 130 via the pivoting unit 150, the leg unit 130 changes between an open-leg posture in which the leg unit 130 supports the top plate unit 110 and a closed-leg posture in which the leg unit 130 overlaps the top plate unit 110 and is folded.
Specifically, the rotating section 150 has rotating bodies 151a to 151b. The rotating bodies 151a to 151b are disposed between the leg members 132a to 132b and the top panel section 110, respectively. That is, the rotating bodies 151a to 151b are located close to the corners of the top panel section 110, respectively.

The rotation restricting portion 160 has a function of restricting the rotation of the leg portion 130 relative to the top plate portion 110 .
Specifically, the rotation restricting portion 160 has rotation restricting bodies 161A and 161B (see FIG. 1). The rotation restricting body 161A is located at the rear in the front-rear direction and is connected to the top plate portion 110 and the leg body 131A. Therefore, the rotation restricting body 161A restricts the rotation of the leg body 131A. The rotation restricting body 161B is located at the front in the front-rear direction and is connected to the top plate portion 110 and the leg body 131B. Therefore, the rotation restricting body 161B restricts the rotation of the leg body 131B.

Two anti-tilt devices 10 are removably attached to the ends of the top plate 110 of the workbench 100. The two anti-tilt devices 10 have the same configuration.

Next, the tipping prevention device 10 will be described.
Fig. 4 is a perspective view showing the state immediately before the tipping prevention device 10 is attached to the top plate portion 110 of the workbench 100. Fig. 5(a) is a side view of the tipping prevention device 10, and Fig. 5(b) is a front view of the tipping prevention device 10.
The tipping prevention device 10 has a function of preventing tipping of the workbench 100. The tipping prevention device 10 includes a detachable part 20, a leg part 30, and a ground part 40.

The detachable part 20 attaches and detaches the tipping prevention device 10 to and from the workbench 100. The detachable part 20 is made of metal, for example, and is formed by bending a metal plate with a press or the like. The detachable part 20 has an upper part 21, a lower part 22, and an intermediate part 23, each of which is substantially plate-shaped, and has a substantially U-shaped cross section when viewed from the front-rear direction. Between the upper part 21 and the lower part 22, a gap is formed through which the end of the top plate part 110 can enter from the horizontal direction. In addition, the upper part 21 is formed with insertion holes 26a, 26b into which the removal prevention pin 25 connected to the upper end of the leg part 30 via the wire 24 is inserted. The insertion holes 26a, 26b are formed at intervals in the front-rear direction. In addition, the lower part 22 is formed with insertion holes 27a, 27b that communicate with the insertion holes 26a, 26b.

The leg 30 extends diagonally downward from the detachable part 20 towards the ground surface. As shown in FIG. 5(a), the inclination angle of the leg 30 (the inclination angle α on the acute side between the ground surface and the leg 30) is 65 degrees to 85 degrees (75 degrees here) when viewed from the front-to-rear direction. The detachable part 20 is connected to the upper end of the leg 30 via a connecting member 31. The leg 30 has a main leg 32 and an extendable leg 33.

The main leg 32 is a main component of the leg section 30. The main leg 32 is made of, for example, an aluminum alloy and formed by extrusion molding. The main leg 32 is, for example, a hollow or solid member that extends linearly and has a generally rectangular cross section.
The telescopic legs 33 are members that extend and retract the legs 30 in the longitudinal direction. The telescopic legs 33 are fitted inside the main legs 32 and can slide along the longitudinal direction of the main legs 32. The telescopic legs 33 are made of, for example, an aluminum alloy and are formed by extrusion molding. The telescopic legs 33 are, for example, hollow or solid members with a substantially rectangular cross section that are a reduced cross section of the main legs 32. The telescopic legs 33 extend and retract the length of the legs 30 by changing the length that protrudes from the lower end of the main legs 32. In FIG. 5, the shortened state of the legs 30 is shown by a two-dot chain line.

The height position of the detachable part 20 can be adjusted by extending and retracting the legs 30 using the extendable legs 33. The tipping prevention device 10 of this embodiment can adjust the height position from the ground surface to the detachable part 20 stepwise in the height direction at intervals of, for example, a pitch p of approximately 33.5 mm from h1 = approximately 1200 mm to h2 = approximately 1910 mm according to the height position of the top plate 110. Furthermore, the tipping prevention device 10 of this embodiment has an adjustment range r of the height position of the detachable part 20 of approximately 710 mm, calculated by h2-h1.

In this way, the pitch p when adjusting the height position of the detachable part 20 in the height direction is smaller than the pitch P when adjusting the height position of the top plate part 110 in the height direction, and here p = approximately P/2. Therefore, the user can adjust the height position of the detachable part 20 at a fine pitch p depending on the conditions of the ground surface, etc. The pitch p may be p = approximately P/n (n is a natural number).
In addition, the adjustment range r of the height position of the detachable part 20 is larger than the adjustment range R of the height position of the top plate part 110. Therefore, the user can adjust the height position of the detachable part 20 beyond the upper limit or lower limit of the adjustment range R of the height position of the top plate part 110 depending on the situation of the ground surface, etc. In addition, since the adjustment range r of the height position of the detachable part 20 is larger than the adjustment range R of the height position of the top plate part 110, the same tilt prevention device 10 can be attached to a workbench of a type having a different height position of the top plate part 110. Specifically, the tilt prevention device 10 can be attached to a workbench in which the height position from the ground surface to the top plate part 110 can be adjusted, for example, from H1 = approximately 1200 mm to H2 = approximately 1600 mm, or can be attached to a workbench in which the height position from the ground surface to the top plate part 110 can be adjusted, for example, from H1 = approximately 1510 mm to H2 = approximately 1910 mm.

The main leg 32 also has a locking mechanism 34. The locking mechanism 34 locks in stages the length that the telescopic leg 33 protrudes from the bottom end of the main leg 32. The locking mechanism 34 is attached to the side of the main leg 32. The locking mechanism 34 locks the telescopic leg 33 to the main leg 32 by engaging a locking claw with one of a number of locking holes 35 (see FIG. 5(a)) formed at intervals along the longitudinal direction of the telescopic leg 33. The pitch p when adjusting the height position of the detachable part 20 in the height direction is the same as the height pitch of the locking holes 35.

The grounding portion 40 is connected to the leg portion 30 and is grounded to the ground surface.
Fig. 6 is a diagram showing an example of the configuration of the grounding portion 40. Fig. 6(a) is a right side view of the grounding portion 40, Fig. 6(b) is a plan view of the grounding portion 40, and Fig. 6(c) is a front view of the grounding portion 40.
The ground contact portion 40 has a swing portion 41 and a seat portion 45 .
The swinging part 41 is connected to the lower end of the leg 30 via a swinging shaft 44 and swings with respect to the leg 30. The swinging part 41 is made of metal, for example, and is formed by bending a metal plate with a press or the like. The swinging part 41 has a pair of side parts 42 and a bottom part 43, and has a substantially U-shaped cross section when viewed from the left and right direction. A gap is formed between the pair of side parts 42 into which the lower end of the leg 30 can enter. In addition, a swinging shaft 44 is inserted between the pair of side parts 42 and the lower end of the leg 30 along the front-rear direction. Therefore, the swinging part 41 can swing around the swinging shaft 44. When the grounding part 40 is grounded on the ground surface, the swinging part 41 swings according to the condition of the ground surface, etc., so that the grounding part 40 can be grounded stably.

In a plan view, the seat portion 45 has a first seat portion 46 which is elongated along the left-right direction, and a second seat portion 49 which is elongated along the front-to-back direction, and the first seat portion 46 and the second seat portion 49 intersect to form an approximately cross shape.
The first seat 46 is a generally rectangular plate that is long in one direction (here, the left-right direction) parallel to the ground surface. The first seat 46 is made of, for example, an aluminum alloy and is formed by extrusion molding. The first seat 46 is fixed to the bottom 43 of the swinging part 41.
As shown in Fig. 6(b), the first seat portion 46 has a longitudinal length L1 (the length of the longest portion) which is 3 times or more and 10 times or less than a lateral width W1 (the width W1 of the longest portion among the widths in the direction perpendicular to the longitudinal direction). Specifically, the length L1 is approximately 350 mm, and the width W1 is approximately 47 mm. The length L1 of the first seat portion 46 is a length that allows stable contact with the ground even if the ground contact surface is a deck plate.

Fig. 6(a) shows the state where the grounding portion 40 is grounded to the deck plate 60. Here, the deck plate is a building material for floors and roofs, and is a plate on which concaves and convexes are formed in a continuous alternating pattern. The deck plate 60 shown in Fig. 6(a) is suitable for heavy loads, and the width S1 of the concave portion is 155 mm, and the width S2 of the flat portion of the convex portion is 95 mm.
Here, the length L1 of the first seat portion 46 is greater than the width S1 of the recess of the deck plate 60. Therefore, even on a deck plate with alternating unevenness in the left-right direction, the first seat portion 46 can stably land on the ground without entering the recess. Also, the length L1 of the first seat portion 46 is smaller than the combined width S3 of two adjacent convex portions of the deck plate 60. In this way, the reason why the length L1 of the first seat portion 46 is smaller than the width S3 is because the contribution to improving stability when landing is small even if the length L1 is made larger than the combined width S3 of the two convex portions. On the other hand, the width W1 of the first seat portion 46 is smaller than the width S1 of the recess of the deck plate 60 and is greater than 0 mm. In this way, the reason why the width W1 of the first seat portion 46 is smaller than the width S1 of the recess of the deck plate 60 is to reduce the weight of the first seat portion 46.

Here, the longitudinal direction of the first seat portion 46 is along the left-right direction. Therefore, when the grounding portion 40 touches the ground surface, the first seat portion 46 contacts the ground surface along the left-right direction. Also, when the tip-over prevention device 10 is attached to the workbench 100, the first seat portion 46 contacts the ground surface along a direction parallel to the short side direction of the top plate portion 110.
In this embodiment, the first seat portion 46 is formed separately from a left seat member 47a located on the left side of the swing shaft 44 and a right seat member 47b located on the right side of the swing shaft 44, and is integrated by fixing them to the swing part 41. However, the first seat portion 46 may be formed integrally from the left seat member 47a and the right seat member 47b. In addition, the first seat portion 46 is not limited to a rectangular shape that is long in one direction, and may be another shape, such as an oval shape that is long in one direction.

An anti-slip member 48, for example made of rubber, is attached to the underside of the first seat portion 46, specifically, the underside of the left seat member 47a and the right seat member 47b. The anti-slip member 48 has multiple protrusions that protrude toward the ground surface, preventing the ground contact portion 40 from slipping on the ground surface due to friction generated between the ground surface and the anti-slip member 48.

The second seat portion 49 is a generally rectangular plate that is long along one direction (here, the front-rear direction) parallel to the ground surface. The second seat portion 49 is made of, for example, an aluminum alloy and formed by extrusion molding. The second seat portion 49 is fixed to mounting portions 52 that are joined to the front and rear of the swinging portion 41. The mounting portions 52 are made of, for example, metal and formed by bending a metal plate with a press or the like. The mounting portions 52 have a generally U-shaped cross section when viewed from the front-rear direction.
As shown in Fig. 6(b) , the second seat portion 49 has a longitudinal length L2 (the length of the longest part) that is 3 times or more and 10 times or less than a lateral width W2 (the width W2 of the longest part of the width in the direction perpendicular to the longitudinal direction). Specifically, the length L2 is approximately 350 mm, and the width W2 is approximately 47 mm. In this embodiment, the length L1 of the first seat portion 46 and the length L2 of the second seat portion 49 are approximately the same, and the width W1 of the first seat portion 46 and the width W2 of the second seat portion 49 are approximately the same. Therefore, even on a deck plate with alternating concaves and convexes in the front-rear direction, the second seat portion 49 can stably come into contact with the ground without entering into any concaves.

Here, the longitudinal direction of the second seat portion 49 is along the front-rear direction. Therefore, when the grounding portion 40 touches the ground surface, the second seat portion 49 contacts the ground surface along the front-rear direction. Also, when the tip-over prevention device 10 is attached to the workbench 100, the second seat portion 49 contacts the ground surface along a direction parallel to the longitudinal direction of the top plate portion 110.
In this embodiment, the second seat portion 49 is formed separately from a front seat member 50a located in front of the pivot shaft 44 and a rear seat member 50b located behind the pivot shaft 44, and is integrated by fixing them to the mounting portion 52. However, the second seat portion 49 may be formed integrally from the front seat member 50a and the rear seat member 50b. The second seat portion 49 is not limited to a rectangular shape that is long in one direction, and may be another shape, such as an oval shape that is long in one direction.

An anti-slip member 51, for example made of rubber, is attached to the underside of the second seat portion 49, specifically, the underside of the front seat member 50a and the rear seat member 50b. The anti-slip member 51 has multiple protrusions that protrude toward the ground surface, preventing the ground contact portion 40 from slipping on the ground surface due to friction generated between the ground surface and the anti-slip member 51.

In addition, the area of the seat 45 that overlaps with the ground surface in a plan view is larger than the cross-sectional area of the leg 30. Here, the area of the seat 45 that overlaps with the ground surface is L1×W1+L2×W2-W1×W2. Meanwhile, the cross-sectional area of the leg 30 is the cross-sectional area A when cut in a direction perpendicular to the longitudinal direction of the main leg 32, as shown in FIG. 4. In this embodiment, the area of the seat 45 that overlaps with the ground surface is 10 times or more and 20 times or less than the cross-sectional area A of the leg 30. The cross-sectional area A is, for example, W1×W2.

Next, a case where the tipping prevention device 10 configured as described above is attached to the workbench 100 will be described.
First, the worker adjusts the height position of the detachable part 20 of the tipping prevention device 10 according to the height position of the top plate part 110 of the workbench 100. Specifically, the telescopic legs 33 are extended and retracted relative to the main legs 32 and locked by the locking mechanism 34 so that the height position from the ground surface to the top plate part 110 and the height position from the ground surface to the detachable part 20 are the same. Next, the worker abuts the detachable part 20 against the top plate part 110 so that the left or right end of the top plate part 110 of the workbench 100 is inserted between the upper part 21 and the lower part 22 of the detachable part 20. Finally, the worker inserts the removal prevention pin 25 after communicating one of the insertion holes 26a and 26b formed in the upper part 21 of the detachable part 20 with the insertion hole 113 of the top plate part 110. The anti-tip device 10 can be attached to the workbench 100 by inserting the anti-detachment pin 25 into the corresponding one of the insertion holes 27 a, 27 b formed in the lower part 22 of the attachment/detachment part 20 .

The operator selects the insertion holes 26a, 26b to be connected to the insertion hole 113 of the tabletop 110 depending on the condition of the ground surface, etc. In other words, even if the tipping prevention device 10 is shifted slightly in the front-to-rear direction so that it can be placed on a stable ground surface, it is possible to connect either of the insertion holes 26a, 26b to the insertion hole 113 of the tabletop 110. The operator can also detach the tipping prevention device 10 from the workbench 100 by performing the reverse operation to that used to attach the tipping prevention device 10.

Thus, according to this embodiment, by attaching the anti-tip device 10 to the workbench 100, the anti-tip device 10 is grounded on the side on which the workbench 100 is likely to tilt, thereby preventing the workbench 100 from tipping over.
According to this embodiment, the grounding portion 40 has a seat portion 45 that is elongated along one direction parallel to the ground surface. Therefore, even if the ground surface has, for example, an uneven surface, the seat portion 45 can be grounded to the ground surface so as to straddle the concave portion, thereby improving the stability when the grounding portion 40 is grounded to the ground surface and preventing the workbench 100 from tipping over.

In addition, according to this embodiment, the seat 45 is substantially cross-shaped, with the first seat 46, which is elongated along one direction, intersecting with the second seat 49, which is elongated along a direction perpendicular to the one direction. Therefore, even if the contact surface has continuous unevenness in any direction, either the first seat 46 or the second seat 49 can contact the contact surface so as to straddle the recess. This improves the stability when the contact surface 40 contacts the contact surface, and prevents the workbench 100 from tipping over.

Although the present invention has been described above with reference to the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment, and modifications and the like are possible within the scope of the present invention.
In the above embodiment, the tilt prevention device 10 is attached to the left end of the tabletop 110, but the present invention is not limited to this, and the device may be attached to the right end, or to both the left and right ends. Also, the present invention is not limited to this, and two tilt prevention devices 10 are attached to the end of the tabletop 110, spaced apart in the front-rear direction, but one or three or more tilt prevention devices 10 may be attached.

In the above embodiment, the leg portion 30 has the extendable leg 33, but this is not limited to this, and the leg portion 30 does not necessarily have to have the extendable leg 33.
In the above-described embodiment, a case has been described in which the seat portion 45 has a first seat portion 46 that is elongated along one direction and a second seat portion 49 that is elongated along a direction perpendicular to the one direction, but the directions need only intersect and do not have to be perpendicular.

In this embodiment, the ground contact portion 40 has a seat portion 45 that is elongated along one direction parallel to the ground contact surface in a plan view when the ground contact portion 40 is placed on the ground contact surface. However, this is not limited to this case, and can be modified as appropriate depending on the problem, etc.

10: Anti-tilt device 20: Detachable part 30: Legs 40: Grounding part 45: Seat 46: First seat 49: Second seat 100: Portable workbench (workbench) 110: Top plate

Claims (9)

A detachable part that is detachable from the workbench;
A leg portion extending from the detachable portion toward a ground surface;
A tipping prevention device comprising: a grounding portion connected to the leg portion,
The ground portion is
This tipping prevention device is characterized in that, when placed on a ground surface, it has a seat portion that, when viewed in a plane , has a shape in which a long shape extending along one direction parallel to the ground surface intersects with a long shape extending along a direction different from the one direction . The seat portion is
The tipping prevention device according to claim 1, characterized in that it has a substantially cross shape in a plan view. The tip-over prevention device according to claim 1 or 2, characterized in that the one direction is, in a plan view, a direction parallel to a direction in which the leg portion extends from the attachment/detachment portion toward the ground surface . The tip-over prevention device according to claim 1 or 2, characterized in that the one direction is, in a plan view, a direction perpendicular to a direction in which the leg portion extends from the attachment/detachment portion toward the ground surface . The one direction is a direction parallel to a direction in which the leg portion extends from the detachable portion toward a ground surface in a plan view,
The tip-over prevention device according to claim 1 or 2, characterized in that the different direction is, in a plan view, a direction perpendicular to a direction in which the leg portion extends from the attachment/detachment portion toward the ground surface. The leg portion is
A main landing gear extending from the detachable portion toward a ground surface;
The tilt prevention device according to any one of claims 1 to 5, further comprising an extendable leg that extends or shortens the length of the leg by gradually changing the length that protrudes from the lower end of the main leg. The tipping prevention device according to any one of claims 1 to 6, characterized in that the inclination angle of the leg on the acute angle side with respect to the ground surface is 65 degrees to 85 degrees. The seat portion is
The tipping prevention device according to any one of claims 1 to 7, characterized in that it is swingable relative to the leg portion via a swing shaft. The seat portion is
9. The tipping prevention device according to claim 1, wherein when the device is placed on a ground surface, an area overlapping with the ground surface in a plan view is larger than a cross-sectional area of the leg portion.

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