TWM538078U - Anti-tilting A-frame ladder - Google Patents

Description

A-shaped ladder that can prevent roll

This creation is related to an A-type ladder, and more particularly to an A-shaped ladder that can prevent roll.

In order to facilitate handling, the existing A-shaped ladder is usually made of a lightweight aluminum alloy. When the person climbs the ladder, the overall center of gravity returns to the body and climbs up. Please refer to FIG. 1 . Although the A-shaped ladder has an angle of opening in one direction to help stabilize, the other side is only a stepped opening with a ladder width of about 60 cm. In an unsafe use, it is easy to have The risk of steady and sideways dumping.

In view of this, there is a need to propose a solution to solve the above problems.

The purpose of this creation is to provide an A-shaped ladder that can prevent roll, which can greatly improve the safety of work.

In order to achieve the above object, the A-shaped ladder of the present invention can include: a first support bar; a second support bar; a third support bar, the top end of the third support bar is connected to the first support bar a top end of the fourth support rod, the top end of the fourth support rod is connected to the top end of the second support rod; a plurality of first pedals, and the two ends of each of the first pedals are respectively fixed to the first support rod and the a second support rod; a plurality of second pedals, two ends of each of the second pedals are respectively fixed on the third support rod and the fourth support rod; two upper folding rails, one of the upper folding rails The two ends are respectively connected to the first support bar and the third support bar, and the other ends of the upper folding cross bar are respectively connected to the second support bar and the fourth support bar; and two diagonal brace bars, The top ends of the two diagonal struts are respectively connected to the two upper folding rails.

According to the creation of the A-shaped ladder which can prevent roll, the diagonal strut can be automatically extended laterally with the A-shaped ladder opening, and can be automatically retracted with the A-shaped ladder folding, which can be conveniently used and more conveniently Can greatly improve the safety of the work.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following detailed description will be made in conjunction with the accompanying drawings. In the description of the present invention, the same components are denoted by the same reference numerals and will be described above.

Referring to FIGS. 2a to 4b, the A-shaped ladder capable of preventing rollover of the present invention includes two vertical ladders, which are a first vertical ladder 110 and a second vertical ladder 120, respectively. The first ladder 110 has a first support rod 111, a second support rod 112 and a plurality of pedals 116. The first support rod 111 is parallel to the second support rod 112, and the plurality of pedals 116 are arranged from bottom to top. The two ends of each of the pedals 116 are fixed to the first support rod 111 and the second support rod 112, respectively. The second ladder 120 has a third support rod 123, a fourth support rod 124 and a plurality of pedals 126, wherein the third support rod 123 is parallel with the fourth support rod 124, and the plurality of pedals 126 are arranged from bottom to top. The two ends of each of the pedals 126 are respectively fixed to the third support rod 123 and the fourth support rod 124. The first ladder 110 and the second ladder 120 can be inclined to stand on the ground, and the top ends of the two ladders 110, 120 are connected to each other.

In addition, the anti-roll A-shaped ladder of the present invention further comprises two upper folding rails 130, two lower folding rails 140, two diagonal strut 150s, two pulling rods 160, and two first pivoting rods 171. Two second pivoting rods 172 and two third pivoting rods 173. The middle portion of the upper folding rail 130 can be folded upward, and the two ends of the folding rail 130 are pivotally connected to the first support rod 111 and the second vertical ladder 120 of the first vertical ladder 110, respectively. The two support rods 123 are respectively connected to the second support rods 112 of the first vertical ladder 110 and the fourth support rods 124 of the second vertical ladder 120, respectively.

The two lower folding rails 140 are respectively disposed below the two upper folding rails 130, and the middle portion of the lower folding rails 140 can also be folded upward. Two ends of the two lower folding rails 140 are pivotally connected to the first support rod 111 and the third support rod 123, respectively, and the two ends of the other lower folding rail 140 are respectively pivotally connected to the second support rod. 112 and the fourth support rod 124.

The two first pivoting rods 171 extend horizontally from the folding points of the center of the two upper folding rails 130, and the top ends of the two diagonally extending rods 150 are pivotally connected to the ends of the two first pivoting rods 171, respectively. The two second pivoting rods 172 extend horizontally from the folding points of the center of the two lower folding rails 140, respectively, and the two third pivoting rods 173 respectively extend from the middle sections of the two diagonally extending rails 150. The two ends of the two tie rods 160 are pivotally connected to the ends of the two second pivot rods 172 and the ends of the two third pivot rods 173, respectively.

According to the creation of the anti-roll A-shaped ladder in use, the first ladder 110 and the second ladder 120 are extended in an A-shape on the ground, and the upper folding rail 130 and the lower folding rail 140 are at this time. The system is stretched straight, and the diagonal struts 150 on both sides are extended to form a figure-eight shape and stand on the ground. When the A-shaped ladder is deployed, the personnel can climb up on the pedals 116, 126. At this time, the diagonal strut 150 protruding outwardly can provide stable support, prevent the A-shaped ladder from rolling, and greatly improve the safety of the work.

Referring to FIG. 5, in order to prevent the upper folding rail 130 and the lower folding rail 140 from being folded during use of the A-shaped ladder, a positioner 182 may be mounted on the upper folding rail 130 to prevent the diagonal strut 150 from being used. During the process of the lateral force, the upper and lower folding rails 130, 140 are folded back, causing the A-shaped ladder to be unstable. In addition, referring to FIG. 6, the bottom end of the diagonal strut 150 can be provided with a foot pad 184 to increase the contact floor area, and the foot pad 184 can be provided to have a universal adjustment function to increase stability.

In addition, referring to FIG. 7 , the present invention can also be provided with an angle fixer 186 at a pivotal connection between the diagonal strut 150 and the first pivotal lever 171, so that the diagonal strut 150 and the first The pivoting rod 171 is topped at a fixed angle to improve stability.

This creation is designed to open the diagonal bracing device that automatically extends with the A-shaped ladder when it is opened and closed like a rib. The upper folding rail 130 of the A-shaped ladder of the present invention is not equal in length to the lower folding rail 140, and is respectively disposed on the side of the A-shaped ladder in the non-opening direction, and the folding openings of the two are downward. The upper and lower folding rails 130 and 140 are respectively fixed at upper and lower positions, and the two positions are separated by a specific distance. When the A-shaped ladder is opened and closed, this specific distance will cause the center folding points of the upper and lower folding rails 130, 140 of the non-equal length to move up or down, and the effect of unequal stroke is produced.

According to the creation of the anti-roll A-shaped ladder, the first pivoting rod 171 is coupled to the fulcrum on the folding rail 130 and the diagonal strut 150, and the second pivoting rod 172 is coupled to the lower folding rail 140 and the rod 160. The pivoting rods 171 and 172 will move in a simple up and down unequal stroke when the A-shaped ladder is opened and closed. The third pivoting rod 173 connects the intermediate fulcrum of the tie rod 160 and the diagonal strut 150, thus forming a relative four-bar linkage mechanism.

In the above-mentioned four-bar linkage mechanism, when the A-shaped ladder is deployed, the first pivoting lever 171 and the second pivoting lever 172 are simply moved to the unequal stroke, wherein the second pivoting lever 172 moves more than the first stroke. The pivot lever 171 moves the stroke. During the simultaneous movement of the first two pivoting rods 171, 172, the first pivoting rod 171 limits the fulcrum moving stroke of the diagonal strut 150, but the second pivoting rod 172 still has more moving strokes, and the excess stroke will force The pull rod 160 pushes the middle fulcrum of the diagonal strut 150 to expand outward, and the rib surface opens the umbrella surface; otherwise, when the A-shaped ladder is folded, the diagonal struts 150 are retracted. Fig. 8 shows the state of the A-shaped ladder which can prevent the roll from being folded.

According to the creation of the anti-roll A-type ladder, the use of the process diagonal strut can automatically extend laterally with the A-shaped ladder open, and can also be folded with the A-shaped ladder, which has no space and can be conveniently used. The advantages. In addition, the creation of the anti-roll A-shaped ladder can provide a stable support anti-roll function, greatly improving the safety of the work.

Although the present invention has been disclosed in the foregoing examples, it is not intended to limit the present invention, and any one of ordinary skill in the art to which the present invention pertains can be modified and modified without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application attached.

110‧‧‧First ladder
111‧‧‧First support rod
112‧‧‧second support rod
116‧‧‧ pedal
120‧‧‧Second ladder
123‧‧‧third support rod
124‧‧‧fourth support rod
126‧‧‧ pedal
130‧‧‧Upper folding rail
140‧‧‧Lower folding rail
150‧‧‧ diagonal strut
160‧‧‧ lever
171‧‧‧First pivot rod
172‧‧‧Second pivot lever
173‧‧‧The third pivoting pole
182‧‧‧ Locator
184‧‧‧ foot pads
186‧‧‧Angle holder

1 is a perspective view of a conventional A-shaped ladder. Fig. 2a is a perspective view of the A-shaped ladder capable of preventing roll. Fig. 2b is another perspective view of the A-shaped ladder capable of preventing roll. Figure 3a is a right side view of the A-shaped ladder that prevents the roll from being created. Figure 3b is a left side view of the A-shaped ladder that prevents the roll from being created. Figure 4a is a front elevational view of the A-shaped ladder of the anti-rolling of the present invention. Fig. 4b is a rear view of the A-shaped ladder which can prevent roll. Figure 5 is a partial enlarged view of a portion A of Figure 2a. Figure 6 is a partial enlarged view of a portion C of Figure 2a. Figure 7 is a partial enlarged view of a portion B of Figure 2a. Fig. 8 is a perspective view of the A-shaped ladder which can prevent the roll from being folded.

110‧‧‧First ladder

111‧‧‧First support rod

112‧‧‧second support rod

116‧‧‧ pedal

120‧‧‧Second ladder

123‧‧‧third support rod

124‧‧‧fourth support rod

126‧‧‧ pedal

130‧‧‧Upper folding rail

140‧‧‧Lower folding rail

150‧‧‧ diagonal strut

160‧‧‧ lever

171‧‧‧First pivot rod

172‧‧‧Second pivot lever

173‧‧‧The third pivoting pole

Claims (9)

An A-shaped ladder capable of preventing roll, comprising: a first support rod; a second support rod; a third support rod, the top end of the third support rod is connected to the top end of the first support rod; a support rod, a top end of the fourth support rod is connected to the top end of the second support rod; a plurality of first pedals, two ends of each of the first pedals are respectively fixed on the first support rod and the second support rod; a plurality of second pedals, wherein two ends of each of the second pedals are respectively fixed on the third support rod and the fourth support rod; two upper folding rails, wherein two ends of the upper folding rail are respectively connected to the a first support bar and the third support bar, and the other ends of the upper folding cross bar are respectively connected to the second support bar and the fourth support bar; and two diagonal brace bars, the top ends of the two diagonal brace bars They are connected to the two upper folding rails respectively. The anti-roll A-shaped ladder as described in claim 1 further comprises: two folding crossbars respectively disposed under the two upper folding rails, wherein one of the two ends of the lower folding rail Connected to the first support bar and the third support bar respectively, and the other ends of the other lower folding bar are respectively connected to the second support bar and the fourth support bar; and two pull rods, one of the pull rods The two ends are respectively connected to one of the lower folding rails and one of the diagonal struts, and the other ends of the other rods are respectively connected to the other of the lower folding rails and the other of the diagonal struts. The anti-roll A-type ladder according to claim 2, further comprising: two first pivoting rods respectively extending from the two upper folding rails, wherein the two diagonal braces are respectively pivotally connected The two first pivoting rods are respectively protruded from the two lower folding rails, wherein the two second pivoting levers are respectively pivotally connected to the two pulling rods; and the two third pivoting joints The rods respectively extend from the two diagonal strut rods, wherein the two third pivot rods are respectively pivotally connected to the two rods. The anti-roll A-type ladder of claim 3, wherein the folding flaps of the two upper folding rails and the folding rails of the two lower folding rails are downward. The anti-roll A-type ladder according to claim 4, wherein the two first pivoting rods respectively protrude from the folding points of the two upper folding rails, and the two second pivoting rods respectively The folding points of the two folding rails extend. The anti-roll A-type ladder according to claim 5, wherein the two tie rods are respectively rotatable upward relative to the two second pivot rods. The anti-roll A-type ladder according to any one of claims 1 to 6, further comprising: a positioner mounted on one of the upper folding rails to prevent it from being folded back. The anti-roll A-type ladder according to any one of claims 1 to 6, further comprising: two foot pads respectively installed at the lower ends of the two diagonal braces to increase contact with the ground area. The anti-roll A-type ladder according to any one of claims 3-6, further comprising: two angle fixers respectively mounted on the two diagonal brace bars and the two first pivot bars a pivotal connection to fix the angle between the two diagonal braces and the two first pivotal bars, respectively.