TWI558908B - Can strengthen the support function of the work ladder - Google Patents

Description

Work ladder that can enhance support function

The invention relates to a climbing aid, in particular to a work ladder capable of strengthening a supporting function.

The existing common work ladder, such as the TW publication No. 319318 patent, mainly comprises two mutually connected ladder frames, each of which has two side struts and a plurality of side struts connected thereto. The ladder can change the angle between the ladders according to the required working height. For example, when the angle between the ladders is less than 90 degrees, the ladders pivot in an inverted V shape and stand up at the same time. On the ground, it is suitable for occasions with low working height. When the ladder frames are unfolded at 180 degrees to each other and one of the ladder frames is placed against the ground, the other ladder frame can be resisted at a high place, and can be used for occasions with a high working height.

Although such work ladders have been commonly used, because the width of the ladders is generally not so large that the ladders of the work ladder are simultaneously supported on the ground, corresponding to the two ladder frames The lateral stability of an inverted V-shaped side is poor. If an external force hits the lateral side of the working ladder or the operator standing on the top of the working ladder is biased to the side, the center of gravity of the working ladder is unstable, which may cause the working ladder to fall over. A staff member’s fall accident occurred. Furthermore, it may also be due to the unstable ground, resulting in stable branches of the ladders. The effect of the support is poor, and the above dangerous situation may also occur.

For example, in the TW publication No. 267756 patent, a support rod is pivotally connected to the top side of a ladder frame, and the two support points at the bottom of the ladder frame and the bottom end of the support rod can generate a three-point positioning effect. Although the work ladder can improve the stability, the operation mode is limited to the ladder frame and the support rod stand on the ground at the same time, and is only suitable for the occasion where the working height is low, when a higher working height is required. This kind of work ladder can't be used, so the scope of use is small and less practical.

Accordingly, it is an object of the present invention to provide a work ladder that can be adjusted to different use states for different use states and that has a more stable support.

Thus, the present invention can enhance the support function of the work ladder, including a pair of ladder frame units and a support rod. Each of the ladder units has a first vertical rod, a second vertical rod spaced apart from the first vertical rod, and a foot rod adjustably coupled to the second vertical rod and are spaced apart from each other and are respectively connected to a stepping bar between the first vertical rod and the second vertical rod, each of the first vertical rods having a first pivoting end pivotally connected to the corresponding first vertical rod and a first opposite to the first a first end of the pivoting end, each of the second vertical rods has a second pivoting end pivotally connected to the corresponding second vertical rod and a second end opposite to the second pivoting end and a a positioning portion on the inner side of the second end, a first length between the first pivot end and the first end is greater than a second length between the second pivot end and the second end, each of the legs has a connecting portion connected to the corresponding second vertical rod, an abutting portion opposite to the connecting portion, and a locking portion between the connecting portion and the abutting portion, the leg members being operable to position the locking portions in the first position of the corresponding positioning portion, and operating the locking portions away from the corresponding positions a second position of the positioning portion, wherein the total length between the second pivoting end and the abutting portion is substantially equal to the first pivoting end and the first end when the leg is in the first position The first length between. The support rod has a connecting end connected to the ladder unit and a positioning end opposite to the connecting end, and the supporting rod can be located away from the first end and located at the first end The supporting position of the same plane is operated such that the positioning end approaches the folding position of the first ends, and when the supporting rod is in the supporting position, the supporting rods can be located at the second position, and the supporting rod is located at the supporting position The legs can be located in the first position when the position is collapsed.

The effect of the invention is that the first position can be operated into the second position by using the foot rods, and the support rod can be operated by the support position to function as the folding position, which can be adjusted not only for different use heights but also for different uses. The state, and the support bar can provide better stable support for the work ladder when in the support position.

10‧‧‧ ladder unit

11‧‧‧First vertical rod

111‧‧‧First pivot end

112‧‧‧ first end

113‧‧‧Locks

L1‧‧‧ first length

12‧‧‧Second vertical rod

121‧‧‧Second pivotal end

122‧‧‧second end

123‧‧‧ Positioning Department

124‧‧‧ joints

L2‧‧‧ second length

13‧‧‧foot

131‧‧‧Connecting Department

132‧‧‧Apartment

133‧‧‧Locking Department

134‧‧‧Perforation

14‧‧‧Steps

L‧‧‧ total length

20‧‧‧Support rod

21‧‧‧Connecting end

22‧‧‧ Positioning end

30‧‧‧Importing unit

31‧‧‧Flexible parts

311‧‧‧ fixed end

312‧‧‧ hooked end

32‧‧‧Hook

Θ‧‧‧ elevation angle

10’‧‧‧ ladder unit

11’‧‧‧first vertical pole

12’‧‧‧Second vertical rod

121’‧‧‧Second pivotal end

122’‧‧‧second end

123’‧‧‧ Positioning Department

125’‧‧‧ casing

13’‧‧‧foot

131’‧‧‧Connecting Department

132’‧‧‧Apartment

133’‧‧‧Locking Department

134’‧‧‧Carding Department

135’‧‧‧Latch

The other features and advantages of the present invention will be apparent from the detailed description of the preferred embodiments of the accompanying drawings, wherein: FIG. 1 is a three-dimensional combination diagram illustrating the first step of the work ladder capable of strengthening the support function of the present invention. Figure 2 is a schematic plan view of a preferred embodiment of the present invention, illustrating that the two ladder frame units are simultaneously supported on the ground and a support rod is located at a support position; Figure 3 is a cross-sectional view taken along line III-III of Figure 2; Figure 4 is a partial enlarged view of Figure 2, showing a coupling unit connected between the support rod and the ladder unit; Figure 5 is Another perspective view of the preferred embodiment of the present invention is shown in an unfolded state of use; FIG. 6 is another plan view of the above preferred embodiment of the present invention, illustrating that the ladder units are unfolded and supported. The rod is located at a folding position; FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6; and FIG. 8 is a perspective assembled view showing the second preferred embodiment of the working ladder capable of strengthening the supporting function of the present invention. Figure 9 is a partially exploded perspective view of a second preferred embodiment of the present invention, illustrating a foot bar slidably inserted into the interior of the sleeve; and Figure 10 is a second preferred embodiment of the present invention Another three-dimensional combination diagram illustrates that the work ladder is in an unfolded use state.

Referring to FIG. 1 and FIG. 2, a first preferred embodiment of the work ladder capable of strengthening the support function of the present invention comprises a pair of ladder frame units 10, a support rod 20 and a tie unit 30.

Each of the ladder frame units 10 has a first vertical rod 11 , a second vertical rod 12 spaced apart from the first vertical rod 11 , and a foot rod 13 adjustably pivotally connected to the second vertical rod 12 . A plurality of spaced apart and respectively connected to the step 14 between the first vertical rod 11 and the second vertical rod 12.

The first vertical rods 11 each have a first pivoting end 111 pivotally connected to the corresponding first vertical rod 11 and a first pivoting end 111 opposite to the first pivoting end 111. The first end 112 and a lock 113 are locked to the first end 112.

The second vertical rods 12 each have a second pivoting end 121 pivotally connected to the corresponding second vertical rod 12, and a second end 122 opposite to the second pivoting end 121. a positioning portion 123 on the inner side of the second end 122 and a joint portion 124 disposed on one side of the positioning portion 123, and a first length L1 between the first pivot end 111 of the first vertical rod 11 and the first end 112 The second length L2 is greater than the second length between the second pivot end 121 and the second end 122. In this embodiment, the positioning portion 123 is located between the joint portion 124 and the second end portion 122.

With reference to FIG. 3, the leg members 13 each have a connecting portion 131 rotatably pivotally connected to the engaging portion 124 of the corresponding second vertical rod 12, and an abutting portion 132 opposite to the connecting portion 131. A locking portion 133 between the connecting portion 131 and the abutting portion 132, a through hole 134 corresponding to the locking member 113, and a latch 135 inserted into the positioning portion 123 and passing through the locking portion 133.

The support rod 20 has a connecting end 21 pivotally connected to the ladder unit 10 and a positioning end 22 opposite to the connecting end 21.

With reference to FIG. 4, the tying unit 30 has at least one flexure 31 and three fixed between the support rod 20 and the second vertical rod 12 of the ladder unit 10, respectively. A hook 32 corresponding to the position of the second vertical rod 12. The number of the flexures 31 of the present embodiment is three, in the form of a strip, and is a chain shape in which a plurality of loops are fastened, and each has a fixing rod 20 and the second vertical rods 12 fixed thereto. The fixed end 311 and a hook end of the hook 32 that can be hooked on the adjacent support rod 20 or the second vertical rod 12 312.

As shown in FIG. 1 and FIG. 2, when the work ladder is to be used in a situation where the working height is low, the foot bars 13 of the ladder unit 10 are first operated into a second position. The locking portion 133 is away from the corresponding positioning portion 123. The abutting portions 132 are respectively positioned inside the first end 112 of the first vertical rods 11, and as shown in FIG. 3, the abutting portions 132 are perforated. The 134 passes through the lock members 113 respectively, so that the abutting portions 132 are locked and disposed on the first vertical rods 11.

The angle between the ladder units 10 is less than 90 degrees, and the positioning end 22 of the support rod 20 is operated away from the first ends 112 and is in the same plane as the first ends 112, so that the support rods 20 is located at a support position. Then, as shown in FIG. 4, the flexures 31 of the tying unit 30 are respectively interposed between the support rod 20 and the second vertical rods 12, that is, the flexures 31 are The hooking end portion 312 is hooked on the hooks 32 of the adjacent support rod 20 and the second vertical rod 12.

At this time, the first ends 112 of the ladder unit 10 and the positioning end 22 stand on the ground at the same time, and form a three-point positioning function, and in actual use, the ladder units 10 can be relative to the horizontal plane. The slanting arrangement, that is, the pedals 13 and the horizontal plane have an elevation angle θ, and the supporting rod 20 is supported on the other side opposite to the elevation angle θ, so that the working ladder can obtain a stable fixed position. Even if there is external force from the lateral impact of the work ladder or the operator's center of gravity deviates, the work ladder will not cause dumping, and there will be no accidental fall of the staff. Moreover, even if the ground is not stable, the three-point positioning effect of the working ladder can produce a stable supporting effect, and can be prevented. Stop dangerous situations.

As shown in FIG. 5, FIG. 6 and FIG. 7, when the working ladder is to be used in a situation where the working height is high, the leg 13 can be first operated from the second position to a first position, and The lock members 113 are detached from the through holes 134 of the abutting portions 132, and the leg portions 13 are pulled, and the connecting portions 131 are respectively rotated by the joint portions 124 of the second vertical rods 12. When the locking portions 133 are corresponding to the positioning portions 123, the locking portions 135 are passed through the locking portions 133 and the positioning portions 123, and the locking portions 133 are positioned at the corresponding positioning portions 123. The leg members 13 are located at the first position, that is, the leg members 13 are overlapped with the second ends 122 of the second vertical rods 12, and the length of support of the second vertical rods 12 is extended, that is, When the leg 13 is in the first position, a total length L between the second pivoting end 121 and the abutting portions 132 is substantially equal to the first pivoting end 111 and the first end 112. The first length L1 between.

Then, the ladder units 10 are further developed to each other at 180 degrees, and the support rod 20 is operated to bring the positioning end 22 closer to the folding position of the first ends 112, and then one of the ladder units The first end 112 of the 10, the abutting portion 132 abuts against the ground, and the other ladder unit 10 can resist the height, so that the work can be performed at a height.

Therefore, in the working ladder of the present invention, as shown in FIGS. 1 and 2, in the state in which the leg members 13 are operated in the second position, the ladder unit 10 is pivoted in an inverted V shape, and the When the support rod 20 is operated as a support position, it can be used not only in the case where the working height is low, but also the first end 112 and the positioning end 22 are simultaneously supported on the ground and form three points. The positioning function can make the work ladder obtain a stable fixed position, which can ensure the safety of the work of the high-level work personnel.

In addition, as shown in FIG. 5 and FIG. 6, in the state in which the leg members 13 are operated in the first position, and the ladder units 10 are mutually deployed at 180 degrees, one of the ladder units 10 is utilized. The first end 112 and the abutting portion 132 abut against the ground, and the other ladder unit 10 can resist the height, so that the work can be performed at a height. Therefore, the type of the work ladder can be changed according to actual needs, and the use range is wider and more practical, and the problem of the existing work ladder can be solved.

8 , FIG. 9 and FIG. 10 , the second preferred embodiment of the work ladder capable of strengthening the support function of the present invention is substantially the same as the first embodiment, the difference being: the same of the ladder unit 10 ′ The first vertical rod 11' omits the locking members, and the second vertical rods 12' each have a hollow sleeve 125' opposite to the second pivot end 121'. The second end 122' The positioning portion 123' is disposed on the sleeve 125', and the leg members 13' each have a connecting portion 131' slidably disposed in the sleeve 125', and a portion opposite to the connecting portion 131' Abutting portion 132', a locking portion 133' between the connecting portion 131' and the abutting portion 132' and approaching the abutting portion 132', and a locking approaching the connecting portion 131' a portion 134' and a latch 135' inserted through the locking portion 133' or the locking portion 134'. When the leg 13' is in the first position, the locking The portion 133' is positioned at the positioning portion 123' (see FIG. 8) through the latch 135'. When the leg 13' is in the second position, the locking portions 134' are positioned through the latch 135'. The positioning portion 123' (see Fig. 10).

Therefore, in the second preferred embodiment of the present invention, the leg members 13 can also be operated from the first position to the second position, and the type of the working ladder can be changed according to actual needs, and the first embodiment can also be achieved. The same purpose and efficacy.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

10‧‧‧ ladder unit

11‧‧‧First vertical rod

111‧‧‧First pivot end

112‧‧‧ first end

113‧‧‧Locks

12‧‧‧Second vertical rod

121‧‧‧Second pivotal end

122‧‧‧second end

123‧‧‧ Positioning Department

124‧‧‧ joints

13‧‧‧foot

131‧‧‧Connecting Department

132‧‧‧Apartment

133‧‧‧Locking Department

134‧‧‧Perforation

135‧‧‧ latch

14‧‧‧Steps

20‧‧‧Support rod

21‧‧‧Connecting end

22‧‧‧ Positioning end

30‧‧‧Importing unit

31‧‧‧Flexible parts

Claims (10)

A work ladder capable of strengthening a supporting function, comprising: a pair of ladder frame units each having a first vertical rod, a second vertical rod spaced apart from the first vertical rod, and an adjustable connection to the second vertical rod a foot rod of the rod and a plurality of spaced apart and respectively connected to the stepping rod between the first vertical rod and the second vertical rod, the first vertical rods each having a pivotal connection with the corresponding first vertical rod a first pivoting end and a first end opposite to the first pivoting end, the second vertical rods each having a second pivoting end pivotally connected to the corresponding second vertical rod, and opposite to the a second end of the second pivot end and a positioning portion located inside the second end, the first length between the first pivot end and the first end is greater than the second pivot end and the second end a second length of the legs, each of the legs having a connecting portion connected to the corresponding second vertical rod, an abutting portion opposite to the connecting portion, and a portion interposed between the connecting portion and the abutting portion a locking portion, the pedals being operable in a first position for positioning the locking portions in the corresponding positioning portions The locking portion is away from the second position of the corresponding positioning portion. When the leg is in the first position, a total length between the second pivoting end and the abutting portion is substantially equal to the first pivot. a first length between the terminal end and the first end; and a support rod having a connection end connected to the ladder frame unit and a positioning end opposite to the connection end, the support rod being configurable by the positioning end a support position away from the first ends and in the same plane as the first ends, operating to bring the positioning end closer to the folding position of the first ends, when the support rod is located at the support position These feet can be In the second position, when the support rod is in the folded position, the foot bars can be located in the first position. The work ladder of the reinforced support function according to claim 1, wherein the connecting portions of the foot bars of the ladder frame unit are rotatably pivotally connected to the corresponding second vertical rods, and the same The connecting portion is a center of rotation and is pivoted from the first position to the second position. The working ladder of the reinforced support function of claim 1, wherein the second vertical rods of the ladder unit further have a hollow sleeve opposite to the second pivot end, the second end The positioning portion is disposed on the sleeve, the connecting portion of the leg is slidably disposed in the sleeve, and is operable from the first position to the second position, the legs further having a proximity a locking portion of the connecting portion, wherein the locking portions are positioned at the positioning portion when the leg is in the second position. The work ladder of claim 2 or claim 3, further comprising a tying unit, the tying unit having at least one of the support rods and the ladder when the support rod is at the support position A flexure between the second vertical bars of the frame unit. The working ladder capable of strengthening the supporting function according to claim 4, wherein the flexible member of the tying unit has a strip shape and the number is three, and the tying unit further has three fixed fixing rods and the supporting rod a hook member corresponding to the corresponding position of the second vertical rod, each of the flexible members having a fixed end fixed to the support rod, the second vertical rod, and a hook that can be hooked on the adjacent support rod or the second vertical The hook end of the hook of the rod. The work ladder capable of strengthening the supporting function as claimed in claim 5, wherein The flexible member of the tying unit is a chain shape in which a plurality of loops are fastened. The work ladder of the reinforced support function of claim 2, wherein the second vertical rods of the ladder unit each have a side disposed on the positioning portion and can be respectively connected to the connecting portions of the foot rods. And the abutting portions are respectively positioned inside the first ends of the first vertical rods when the legs are in the second position. The working ladder capable of strengthening the supporting function according to claim 7, wherein when the legs of the ladder unit are in the second position, the abutting portions are respectively located at the first position with a lock lock The first end of the vertical rod. The working ladder capable of strengthening the supporting function according to claim 1, wherein when the supporting rod is located at the supporting position, the ladder unit can stand on the ground at the same time and the angle between the ladder units is less than 90 degrees. . The working ladder capable of strengthening the supporting function according to claim 9, wherein when the supporting rod is located at the folding position, the ladder units are mutually deployed and an angle between the ladder units approaches 180 degrees.