TWI700426B - Anti-tilt device for ladder - Google Patents

Abstract

The present invention is an anti-tilting device for ladders, which comprises: a first extension part and a second extension part. A position of the first extension part in the longitudinal direction is combined with at least one ladder foot to make the first extension part A part of the length of the second extension is parallel to the bearing surface; a part of the length of the second extension is combined with the first extension so that a part of the length of the second extension is perpendicular to the bearing surface, and the first extension The position where the two extension parts contact the bearing surface is located outside the area surrounded by the projection of the ladder foot on the bearing surface. The invention can prevent the working ladder from tilting during use, which may endanger users.

Description

Anti-tilt device for ladder

The present invention relates to an anti-tilt device for ladders, in particular to an additional anti-tilt device for ladders with at least two extension parts.

In the implementation of the ladders of the prior art, the ladders of the prior art have no other support means except for the feet of the ladder, or only a long object extends from the feet of the ladder to contact the ground. However, since the elongated object is obviously only inclined to the ground and its oblique angle is very large, its horizontal extension is actually insufficient compared with its length, and the supporting force is insufficient. If the elongated object is designed to slide from the ladder foot to When expanding the horizontal extension range, it is also easy to move along the sliding path under force. As a result, the personnel on the ladder are likely to fall from a height due to the center of gravity exceeding the horizontal extension range when moving laterally, which may cause serious injury. This shortcoming is especially worse for ladders without other support means.

In view of this, the present invention proposes an anti-tilt device for ladders with at least two extensions to increase the extension range and support force, improve stability, and be easily adjusted to adapt to different environments.

The present invention provides an anti-tilt device for a ladder, which includes a first extension portion and a second extension portion. One point in the length direction of the first extension portion is combined with at least one ladder foot so that the first extension portion A part of the length is parallel to the bearing surface; a part of the length of the second extension is combined with the first extension so that a part of the length of the second extension is perpendicular to the bearing surface, and the second extension The extension part contacts the bearing surface and is located outside the area surrounded by the projection of the ladder foot on the bearing surface.

According to the anti-tilting device for a ladder of the present invention, the first extension part further includes a first movable part to be combined with at least one of the ladder legs to move the first extension part.

In the anti-tilt device for a ladder of the present invention, at least one of the first movable portion and the first extension portion further includes a first locking portion to fix the first extension portion.

In the anti-tilt device for a ladder of the present invention, the included angle of the maximum movable range of the projection of the length direction of the first extension portion on the bearing surface is less than 270 degrees.

In the anti-tilt device for ladders of the present invention, the included angle between the length direction of the first extension part and the direction perpendicular to the bearing surface is less than or equal to 120 degrees.

The anti-tilt device for a ladder of the present invention, wherein the included angle of the length direction of the first extension part projected on the maximum movable range of the bearing surface is less than 270 degrees, and the length direction of the first extension part is perpendicular to The angle between the maximum range of movement in the direction of the bearing surface is less than or equal to 120 degrees.

In the anti-tilting device for a ladder of the present invention, the second extension part further includes a second movable part to be combined with the first extension part to move the second extension part.

In the anti-tilting device for a ladder of the present invention, at least one of the second movable portion and the second extension portion further includes a second locking portion to fix the second extension portion.

The anti-tilt device for ladders of the present invention, wherein the maximum range of movement in the longitudinal direction of the second extension is less than or equal to π in the solid angle of the cone formed by the junction with the first extension.

The anti-tilting device for ladders of the present invention, wherein the first extension part is telescopic.

The anti-tilting device for a ladder of the present invention, wherein the second extension part is telescopic.

Compared with the prior art, the present invention can provide additional support and extension, support force and/or stability, thereby improving user safety. In addition, the present invention can be easily adjusted to different environments through multiple movable and locking mechanisms.

In order to fully understand the purpose, features and effects of the present invention, the following specific embodiments are used in conjunction with the accompanying drawings to give a detailed description of the present invention. The description is as follows:

An anti-tilt device 1 for a ladder of the present invention may include a first extension part 121 and a second extension part 122.

The ladder 3 as described above may include a support member and a plurality of pedals 31. In particular, the support member may be called a ladder frame or foot 30, and one end of its length direction can be used to contact a bearing surface 2 such as the ground, as shown in FIG. 1 Shown. The ladder 3 can be any kind of ladder. Specifically, the ladder 3 can be a work ladder.

Taking a two-legged ladder as an example, a plurality of pedals 31 as described above can be connected to at least two ladder legs 30 so that a part of the ladder legs 30 between the adjacent pedals 31 and the connection point forms a closed shape. Specifically, the closed shape may be a square, but the present invention is not limited to this, and the closed shape may be a parallel triangle, quadrilateral, trapezoid, or the like. Alternatively, when the pedal 31 and/or the foot 30 have a zigzag shape, the closed shape may be a polygon. Alternatively, the pedal 31 and/or the ladder foot 30 may have an arc shape.

The anti-tilt device 1 for a ladder as described above may include a first extension part 121 and a second extension part 122. A position in the length direction of the first extension part 121 can be combined with at least one ladder foot 30 to make the first A part of the length of the extension part 121 is parallel to the bearing surface 2. A part of the length of the second extension part 122 can be combined with the first extension part 121 so that a part of the length of the second extension part 122 is perpendicular to the bearing surface 2, and the position where the second extension 122 contacts the bearing surface 2 can be located outside the area surrounded by the projection of the ladder feet 30 on the bearing surface 2. More specifically, the position where the second extension portion 122 contacts the bearing surface 2 may be located outside the area surrounded by the ladder feet 30 and the pedals 31 projected on the bearing surface 2.

In detail, a position in the longitudinal direction of the first extension 121 can be combined with at least one ladder leg 30 may mean that the combination of the first extension 121 and the ladder leg 30 is not limited to one end of the first extension 121 in the longitudinal direction. A part of the length of the first extension 121 is parallel to the bearing surface 2 can mean that the extension direction of the length of the first extension 121 can be at an angle with the bearing surface 2, so the length of the first extension 121 is projected on the parallel bearing surface 2. The length of the direction (specifically, the horizontal direction relative to the ground surface) may be a part of the length of the first extension portion 121. In addition, that a location in the length direction of the second extension portion 122 may be combined with the first extension portion 121 may mean that the location where the second extension portion 122 and the first extension portion 121 are combined is not limited to one end in the length direction of the second extension portion 122. A part of the length of the second extension 122 is perpendicular to the bearing surface 2 may mean that the extension direction of the length of the second extension 122 can be at an angle to the normal of the bearing surface 2, so the length of the second extension 122 is projected to be perpendicular The length of the bearing surface 2 in the direction (specifically, the vertical direction relative to the ground surface) may be a part of the length of the second extension portion 122. Furthermore, the contact of the second extension portion 122 with the bearing surface 2 may be at least outside the area surrounded by the projection of the ladder feet 30 on the bearing surface 2, which may mean that when the two-legged ladder is leaning against something and standing up The enclosed area can be the two ladder feet 30 and the pedals 31 (more specifically, the two ladder feet 30 and the pedals 31) projected downward on the area enclosed by the bearing surface 2, and as shown in FIG. When a foot ladder (such as a herringbone ladder) is erected, the enclosed area can be the area surrounded by four ladder legs 30 and the steps 31 projected downward on the bearing surface 2, and the remaining number of multi-leg ladders By analogy, I won't repeat it.

As shown in Figure 3, the first extension 121 and/or the second extension 122 can be implemented in a single section of sticks, rods, rods, tubes, etc., but can also be implemented in multiple sections of sticks, rods, rods, tubes, etc. In particular, the first extension portion 121 and/or the second extension portion 122 may be composed of a plurality of telescopic pipes 1211 and 1221. In detail, the pipes 1211 can be hollow pipes, and the adjacent pipes 1211 can be sleeved with each other for the option of expansion and contraction. In addition, the single pipe 1211 or each section of the pipe 1211 may have a fixing opening 12111 for fixing the locking member 1212 such as a pin. However, the pipe 1211 may not have the fixing opening 12111. For example, a locking member 1212 such as a clamp and/or a pressing fastener is provided on the outer pipe 1211 for fixing each section of the pipe 1211, but the present invention is not limited to this. The specific implementation of the second extension portion 122 can also be similar to the first extension portion 121, which will not be repeated.

As shown in FIG. 2, the second extension portion 122 may further include a pressure divider 123 where it contacts the bearing surface 2, and its contact area with the bearing surface 2 may be larger than the area where only the second extension portion 122 contacts the bearing surface 2 , In order to distribute the pressure applied to the bearing surface 2 and/or provide a more stable center of gravity distribution. The pressure divider 123 can be fixedly combined with the second extension portion 122, but the pressure divider 123 can be movably combined with the second extension portion 122 for adjusting the posture of the pressure divider 123 and the second extension portion 122 relative to the bearing surface 2 to provide a more stable The portion where the second extension portion 122 and/or the pressure dividing member 123 is movably combined with the second extension portion 122 of the pressure dividing member 123 may further include another locking member.

As shown in FIG. 4, the first extension part 121 of the anti-tilt device 1 for a ladder of the present invention may further include a first movable part 1212 to be combined with at least one ladder foot 30 to move the first extension part 121. Specifically, the first movable portion 1212 can be a universal joint, a spherical bearing set with at least a part of an arc-shaped surface (as shown in FIG. 3), etc. However, the purpose of the present invention is not exhaustive, so the present invention is not limited thereto.

As shown in FIG. 2, the included angle θ ₁ of the length direction of the first extension part 121 of the anti-tilt device 1 for a ladder of the present invention projected on the bearing surface 2 can be less than 270 degrees. Alternatively, the first extension part 121 may be directly fixed to the foot 30 of the ladder, for example, the fixing member 13 in FIG. 5, or the first movable part 1212 may be fixed to the foot 30 of the ladder 30 by the fixing member 13. One of the many implementations of the fixing member 13 can be to fix the fixing member 13 to the foot 30 of the ladder 30 by combining the bonding plate 131, the clasp 132, and a pair of bolt clips 133, but the purpose of the present invention is not exhaustive. Therefore, the fixed implementation of the present invention is not limited to this.

As shown in FIG. 3, the first movable portion 1212 and/or the first extension portion 121 of the anti-tilt device 1 for a ladder of the present invention may further include a first locking portion 1213 to fix the first extension portion 121. For example, the limiting member 12121 of a spherical bearing set with at least part of an arc-shaped surface may have an opening 12121a for the first locking portion 1213 such as screws, bolts, etc. to be locked into the fixed spherical bearing 12122, and the fixed spherical bearing 12122 It may also have a recess or a through hole (which may have a thread) for the first locking portion 1213 to be locked in and fixed. Alternatively, the first locking portion 1213 may be another locking member such as a clamp and/or a pressing fastener, but the purpose of the present invention is not exhaustive, so the implementation of locking the first movable portion 1212 of the present invention is not limited to this.

In addition, as shown in FIG. 1, the included angle θ ₂ of the length direction of the first extension part 121 of the anti-tilt device 1 for a ladder of the present invention projected to the direction perpendicular to the bearing surface ₂ can be less than or equal to 120. Degree angle.

Furthermore, the included angle θ ₁ of the maximum range of motion of the first extension 121 projected on the bearing surface 2 can be less than 270 degrees, and the length of the first extension 121 is the maximum motion of the direction perpendicular to the bearing surface 2 The included angle θ _{2 of the} range may be less than or equal to an angle of 120 degrees. In addition, the first extension 121 can rotate 360 degrees in its axial direction.

As shown in FIG. 3, the second extension portion 122 of the anti-tilt device 1 for a ladder of the present invention may further include a second movable portion 1222 to be combined with the first extension portion 121 to move the second extension portion 122. In addition, the second movable portion 1222 and/or the second extension portion 122 may further include a second locking portion 1223 to fix the second extension portion 122. In addition, the maximum movement range of the second extension portion 122 in the longitudinal direction may be less than or equal to π at the solid angle of the cone formed by the junction with the first extension portion 121. Specifically, the maximum range of movement in the length direction of the second extension portion 122 may be equal to 0 at the solid angle of the cone formed by the junction with the first extension portion 121. In addition, the second movable portion 1222 can rotate 360 degrees in the axial direction.

The structure of the second extending portion 122, the locking member, the structure of the second locking portion 1223, the second movable portion 1222, etc. can be deduced from the related content of the first extending portion 121 by analogy, and will not be repeated.

To sum up, the present invention greatly increases the area of the foot of the ladder by using the accessory device that can be installed on the work ladder to match the actual ground conditions, and avoids the work ladder from toppling. In addition, the present invention solves the problem of insufficient extension range, insufficient support force, and/or insufficient extension range, insufficient support force, and/or lack of extension of the prior art ladder without additional support or diagonal ladder legs under the same size by adjusting the first extension portion and the second extension portion to be perpendicular to each other. It is easy to slide along the foot of the ladder, causing the user to fall. Furthermore, the present invention can be easily adjusted to different environments through a variety of movable and locking mechanisms, and effectively maintains a high degree of safety.

The present invention has been disclosed in a preferred embodiment above, but those skilled in the art should understand that the embodiment is only used to describe the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to this embodiment should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the scope of the patent application.

1: Anti-tilt device for ladder

121: first extension

1211: pipe fittings

12111: opening

1212: The first activity department

12121: limit piece

12121a: opening

12122: Class spherical bearing

1213: The first locking part

122: second extension

1221: pipe fittings

1222: The second activity department

1223: second locking part

123: pressure divider

13: fixed parts

131: Plywood

132: Clasp

133: Bolt Clip

2: bearing surface

3: ladder

30: Ladder foot

31: Pedal

θ ₁ , θ ₂ : included angle

Fig. 1 is a schematic diagram of the anti-tilting device for a ladder of the present invention in a two-legged ladder configuration. Figure 2 is a schematic diagram of the anti-tilt device for a ladder of the present invention in a herringbone ladder configuration. Fig. 3 is a schematic diagram of the extension piece of the anti-tilt device for a ladder of the present invention. Fig. 4 is a schematic diagram of one aspect of the first movable part of the anti-tilt device for a ladder of the present invention. Fig. 5 is a schematic diagram of a mode of combining the extension piece and the foot piece of the anti-tilt device for a ladder of the present invention.

1: Anti-tilt device for ladder

121: first extension

1212: The first activity department

1213: The first locking part

122: second extension

1222: The second activity department

1223: second locking part

123: pressure divider

2: bearing surface

3: ladder

30: Ladder foot

31: Pedal

Claims (8)

An anti-tilt device for a ladder includes: a first extension part, one of which is combined with at least one ladder foot in the length direction, so that a part of the length of the first extension part is parallel to the bearing surface; and a second extension Part, a part of the length direction of which is combined with the first extension part, so that a part of the length of the second extension part is perpendicular to the bearing surface, and the second extension part contacts the bearing surface at the projection of the ladder foot Outside the area enclosed by the carrying surface; and a first movable portion included in the first extension portion to be combined with at least one of the ladder legs to move the first extension portion, and the length direction projection of the first extension portion The included angle between the maximum range of motion on the bearing surface is less than 270 degrees, and the included angle between the length direction of the first extension and the maximum range of motion perpendicular to the bearing surface is less than or equal to 120 degrees, the second The maximum range of movement in the length direction of the extension is less than or equal to π in the solid angle of the cone formed by the junction with the first extension. According to the anti-tilting device for a ladder according to claim 1, at least one of the first movable portion and the first extension portion further includes a first locking portion to fix the first extension portion. The anti-tilt device for a ladder according to claim 1, wherein the included angle of the maximum movable range of the projection of the length direction of the first extension portion on the bearing surface is less than 270 degrees. The anti-tilt device for a ladder according to claim 1, wherein the included angle between the length direction of the first extension part and the direction perpendicular to the bearing surface is less than or equal to 120 degrees. According to the anti-tilting device for a ladder according to claim 1, the second extension part further includes a second movable part to be combined with the first extension part to move the second extension part. According to the anti-tilting device for a ladder according to claim 1, at least one of the second movable portion and the second extension portion further includes a second locking portion to fix the second extension portion. The anti-tilt device for a ladder according to claim 1, wherein the first extension part is telescopic. The anti-tilt device for a ladder according to claim 1, wherein the second extension part is telescopic.

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