Step ladder fall prevention pole
The fall prevention pole for step ladders, with a fixed pipe and sliding mechanism, addresses the safety and convenience issues of conventional safety bars by providing a stable grip for high-altitude work, ensuring balance and safety.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- 菅原長一
- Filing Date
- 2023-11-09
- Publication Date
- 2026-06-29
AI Technical Summary
Conventional safety bars on step ladders lack safety, convenience, and unity with the support column, causing discomfort and uneasiness during high-altitude work, especially when there is no object to hold onto.
A fall prevention pole is attached to the support column of a step ladder, comprising a fixed pipe, sliding pole, and multiple fixing devices, allowing the pole to extend beyond the top plate and be securely fixed, providing a stable grip for high-altitude work.
The fall prevention pole ensures balance and safety during high-altitude work by allowing a secure grip, addressing the shortcomings of conventional safety bars and enhancing user confidence.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention is a device that is attached to the upper part of the support column of a step ladder and is for preventing a fall accident that occurs during work on the upper stage of the step ladder, and relates to a fall prevention pole for a step ladder.
Background Art
[0002] Conventionally, a step ladder has three or four support columns and is provided to be used on a horizontal plane. When using a step ladder, working on the upper part or the top plate is prohibited, but depending on the work site, there are cases where it is inevitable to deal with it. When the object to be worked on is lower than the top plate, the support column serves as a support and safety is ensured, but when it is high, there is no object to hold on to, so it is dangerous. As a prior example, there is a safety bar at the uppermost stage of a step ladder (for example, see Patent Document No.) devised to make high-altitude work safe on the uppermost stage of a step ladder.
Prior Art Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the safety bar at the uppermost stage of the step ladder described in Patent Document 1, fixtures, attachment belts, etc. are simple and lack safety and convenience, and there is a feeling of uneasiness in high-altitude work. Also, when the step ladder is closed, there is a sense of discomfort with the safety bar, and it lacks unity with the step ladder support column.
[0005] The present invention aims to solve the problems of such a conventional configuration, and by attaching a fall prevention pole that can be easily attached to a general-purpose popular step ladder (used step ladder), work on an object higher than the top plate of the step ladder can also be ensured safe, and it is possible to perform high-altitude work with confidence. [Means for solving the problem]
[0006] In the present invention, the fall prevention pole for a stepladder is a device that is attached to the top of the support column of a stepladder, consisting of three or four legs, and is attached to two or more support columns. The aforementioned fall prevention pole for the stepladder mainly consists of a fixed pipe, a first fixing device, a second fixing device, a third fixing device, a sliding pole, and a gap prevention cap. The first, second, and third fixing devices are attached to the side of the support column of the stepladder, and the fixed pipe is set on the top of the support column by the first and second fixing devices. A single sliding pole slides freely within the fixed pipe as its axis, and the lower end of the sliding pole is equipped with a knob bolt that serves to operate and fix it, and the hook-shaped groove on the back of the second fixing device is through which the knob bolt passes. By extending the sliding pole higher than the top plate of the stepladder, the lower end of the sliding pole simultaneously fits into the hook-shaped groove of the second fixing device, and this shape is tightened and fixed with the knob bolt.
[0007] Furthermore, when the slide pole is extended higher than the top of the stepladder, the knob bolt at the lower end of the slide pole passes through a hook-shaped groove on the back of the second fixing device. When the lower end of the slide pole stops at the recess of the hook-shaped groove, the contact point with the second fixing device is tightened and secured by the knob bolt, thereby stabilizing the tip of the slide pole.
[0008] Furthermore, when storing the slide pole, the knob bolt at the lower end of the slide pole passes through a hook-shaped groove on the back of the third fixing device, and when the lower end of the slide pole stops at the recess of the hook-shaped groove, the contact point with the third fixing device is tightened and secured with the knob bolt, which is a feature of this fall prevention pole for a stepladder. [Effects of the Invention]
[0009] As described above, in the ladder fall prevention pole of the present invention, the sliding pole, which is set on the upper part of the ladder's support column and moves up and down around a fixed pipe as its main axis, extends its tip higher than the top plate of the ladder and fixes its lower end. As a result, when working at height, one can grab onto this pole, thus ensuring balance and allowing work to be performed safely and with peace of mind, thus achieving its intended effect. [Brief explanation of the drawing]
[0010] [Figure 1] Side view of the slide pole [Figure 2] 2. Side view of the fixing pipe [Figure 3] 3. Exploded oblique view of the first fixing device [Figure 4] 4. Disassembled oblique view of the second fixing device. [Figure 5] 5. Exploded oblique view of the third fixing device. [Figure 6] Plan view of the first fixing device after disassembly. [Figure 7] Deconstructed plan view of the second fixing device [Figure 8] Decomposed plan view of the third fixed drawing [Figure 9] 3. Plan view, side view, and overhead view of the first fixing device. [Figure 10] 4. Plan view, side view, and overhead view of the second fixing device. [Figure 11] 5. Plan view, side view, and overhead view of the third fixing device. [Figure 12] 4. Plan view showing the fixed pipe, sliding pole, and second fixing device as a set on the support column of the stepladder. [Figure 13] 4. Cross-section of a stepladder where the support column, fixing pipe, sliding pole, and second fixing device are set together. [Figure 14] Plan view showing the set of fixing pipes, sliding poles, and second fixing devices attached to the support column of a stepladder, secured by tightening with knob bolts. [Figure 15] Similarly, cross-sectional view [Figure 16] Diagram showing a stepladder with a fall prevention pole attached to the support column and a sliding pole lowered for storage. [Figure 17] Schematic diagram of a ladder with a fall prevention pole set on the support column of the ladder and the slide pole extended upward Mode for carrying out the invention
[0011] The fall prevention pole of the ladder according to the present invention is a device attached to the support column of the ladder composed of three legs or four legs. In the fall prevention pole, through a fixed pipe provided at the upper front part of the support column of the ladder, one slide pole can slide up and down. By extending the slide pole higher than the top plate of the ladder and fixing the lower end, its function is established. The fall prevention pole of the ladder is composed of a fixed pipe, a slide pole, a knob bolt, a first fixture, a second fixture, a third fixture, and a gap prevention cap.
[0012] The fixed pipe is set at the upper right front of the ladder support column. With the fixed pipe as the axis, one slide pole passes through the fixed pipe and slides up and down. Also, the front width of the ladder support column and the thickness of the fixed pipe are of the same size.
[0013] The fixed pipe is composed of a metal pipe with a diameter of 24 mm and a length of 600 mm. At the tip of the fixed pipe, a gap prevention cap is provided to minimize the contact surface gap with the slide pole. Its function is to prevent rattling of the contact surfaces when the slide pole is extended upward. Also, the tip of the fixed pipe is fixed to the support column of the ladder by a first fixture, and the lower end is fixed to the support column of the ladder by a second fixture. It is the axis of the up and down movement of the slide pole, and the fixed pipe plays an important role thereby.
[0014] The slide pole slides up and down through a fixed pipe attached to the upper right front of the ladder post as the axis. A knob bolt is provided at its lower end. When the slide pole is extended upward when the ladder is opened, the knob bolt tightens the contact surface between the lower end of the slide pole and the second fixture with the knob bolt through the hook-shaped groove on the back of the second fixture, so that its movement stops and is fixed, and the tip of the slide pole is stabilized. When the ladder is closed and the slide pole is extended downward, the knob bolt tightens and fixes the contact surface between the lower end of the slide pole and the third fixture with the knob bolt through the hook-shaped groove on the back of the third fixture, so that its movement stops and it becomes integrated with the ladder.
[0015] The slide pole is a metallic pipe with a diameter of 22 mm and a length of 1,300 mm. A knob bolt is set at the lower end of the slide pole. It moves simultaneously based on the hook-shaped groove, and its operation is performed by the knob bolt, which is the main part of the anti-fall pole.
[0016] The first fixture is composed of a semi-cylindrical fitting and a U-shaped fitting. A fixed pipe is set on the upper right front of the ladder post, and the U-shaped fitting is fitted through the support on its side, and then wrapped with the semi-cylindrical fitting from above. Two holes with a diameter of 6 mm are provided at the two joint parts respectively. Through these holes, the upper part of the fixed pipe is fixed to the support part by tightening with bolts and nuts. The semi-cylindrical fitting is a semi-cylindrical fitting with a circumference of 110 mm, a height of 45 mm, and a lower end width of 28 mm. It becomes integrated by wrapping the fixed pipe from above and combining with the U-shaped fitting. Two holes with a diameter of 6 mm are provided at two lower contact surfaces.
[0017] The U-shaped fitting is a rectangular fitting with an inner diameter of 24 mm at the base, a height of 68 mm, and a width of 30 mm, with two 6 mm diameter holes at its tip. The U-shaped fitting is fitted onto the side of the support column with the fixing pipe set on the upper right front of the stepladder column, and then wrapped over with a semi-cylindrical fitting to form a single integrated unit.
[0018] The second fixing device consists of a semi-cylindrical fitting and a U-shaped fitting. A fixing pipe is set on the upper right front of the stepladder support column, and the U-shaped fitting is fitted to the lower end of the pipe via the side of the support column. The semi-cylindrical fitting then encloses the U-shaped fitting, and there are two holes with a diameter of 6 mm at the joint of each component. By tightening bolts and nuts through these holes, the lower end of the fixing pipe is secured to the support column.
[0019] The semi-cylindrical fitting has a circumference of 110 mm, a height of 45 mm, and a lower end width of 28 mm. It encloses the fixing pipe from above and is combined with the U-shaped fitting to form a single unit. The back of the semi-cylindrical fitting has a hook-shaped groove, which is for the knob bolt on the slide pole to pass through. This allows the lower end of the slide pole to be set in the hook-shaped groove, thereby facilitating the operation of the knob bolt. Additionally, there are two 6 mm diameter holes on the contact surface at the bottom.
[0020] The U-shaped fitting is a rectangular fitting with an inner diameter of 24 mm at the base, a height of 68 mm, and a width of 50 mm. It has two holes with a diameter of 6 mm at its tip. The fixing pipe is set on the upper right front of the stepladder support column, and the U-shaped fitting is used to secure it to the column. The semi-cylindrical fitting then wraps around it, creating a single, integrated unit.
[0021] The third fixing device consists of a semi-cylindrical fitting and a U-shaped fitting, and is set in the central part on the front right side of the stepladder support column. Its role is to house and secure the lower end of the slide pole and the knob bolt.
[0022] The semi-cylindrical fitting is a semi-cylindrical fitting with a circumference of 110 mm, a height of 45 mm, and a lower end width of 28 mm. It is formed by enclosing the fixing pipe from above and combining it with the U-shaped fitting to create a single unit. The back of the semi-cylindrical fitting has a hook-shaped groove through which a knob bolt, which is provided at the lower end of the slide pole, passes. The lower contact surface has two holes with a diameter of 6 mm.
[0023] The U-shaped bracket is a rectangular bracket with an inner diameter of 24 mm at the base, a height of 68 mm, and a width of 40 mm. It has two 6 mm diameter holes at its tip and is set in the center of the front right side of the stepladder support. It is then wrapped and joined with a semi-cylindrical bracket, and its function is achieved by tightening and fixing it with bolts and nuts through the holes at the tip.
[0024] The following describes an embodiment of the fall prevention pole for a stepladder, based on Figures 1 to 17.
[0025] The fall prevention pole for the stepladder consists of a sliding pole (Figure 1), a fixing pipe (Figure 2), a first fixing device (Figure 3), a second fixing device (Figure 4), a third fixing device (Figure 5), a knob bolt (Figure 1-1a), and a gap prevention cap (Figure 2-2a).
[0026] When setting up the fall prevention pole for a stepladder, it is preferable to set it on the upper right side of the front of the stepladder's support column.
[0027] The first fixing device, Figure 3, consists of a U-shaped bracket, Figure 3-3b, which is attached to the top of the stepladder support column. Next, the second fixing device, Figure 4, consists of a U-shaped bracket, Figure 4-4b, which is attached to the second step of the top of the support column, at the point where it contacts the step. The fixing pipe, Figure 17-2, is then set at these two fixing device positions. The fixed pipe, Figure 13-2, in its set form, is then wrapped from above by a semi-cylindrical bracket, Figure 13-4a, and combined with the U-shaped bracket, Figure 13-4b. The fixing pipe is then secured to the support column, Figure 13-6, by fastening it with bolts, Figure 5c and nuts, Figure 5d, through two holes, Figures 5a1 and 5b1, which are provided in the support column section, Figure 12. The fixing pipe is then secured to the support column section, Figure 13-6, by the fixing devices shown in Figures 17-3 and 17-4.
[0028] The slide pole (Figure 12-1) is set via the fixed pipe (Figure 12-2), and the slide pole (Figure 12-1) slides up and down within this pipe, with the fixed pipe as its axis. The tip of the fixed pipe (Figure 2) is equipped with a gap prevention cap (Figure 2a) or (Figure 17-2a), which minimizes play at the contact surfaces when the slide pole (Figure 17-1) is extended to its full height. The lower end of the slide pole (Figure 1-1) is equipped with a knob bolt (Figure 1-1a), which is an integrated unit that moves simultaneously in the same direction. The movement of the slide pole is controlled by the knob bolt.
[0029] The second fixing device, a semi-cylindrical metal fitting (Figure 4-4a), has a hook-shaped groove (Figure 4-4a2) on its back. This groove is through which the knob bolt (Figure 1-1) passes. When extending the slide pole (Figure 1) upwards, the knob bolt (Figure 1-1a) passes through the hook-shaped groove (Figure 4-4a2) and rotates to the right, stopping at the indentation at the end of the groove. At this point, tightening it with the knob bolt (Figure 15-1a) stops the movement of the slide pole (Figure 17-1), and its tip becomes stationary. Therefore, when working at heights, the extended slide pole (Figure 17-1) can be used as a fall prevention aid, allowing for balance and safe work by holding onto it.
[0030] When closing the legs of the stepladder, slide the pole (Figure 16-1) down to the position of the third fixing device (Figure 16-5). The knob bolt (Figure 1-1a) at the lower end is tightened with the knob bolt (Figure 16-1a) when it stops in the recess formed by the hook-shaped groove (Figure 5-5a2), thereby integrating the fall prevention pole with the stepladder. [Explanation of Symbols]
[0031] 1. Slide pole 1a Knob bolt 1b Knob bolt insertion hole 2 Fixing pipes 2a Gap prevention cap 3 First fixture 3a Semi-cylindrical fitting 3a1 Hole in semi-cylindrical metal fitting 3b U-shaped bracket Hole in 3b1U type metal fitting 3c Similarly, bolt 3d Similarly, nuts 4 Second fixture 4a Semi-cylindrical fitting 4a1 Hole in semi-cylindrical metal fitting 4a2 Semi-cylindrical fitting with hook-shaped groove 4b U-shaped fitting Hole in 4b1U type metal fitting 4c Similarly, bolt 4d Similarly, nuts 5 Third fixture 5a Semi-cylindrical fitting 5a1 Hole in semi-cylindrical metal fitting 5a2 Semi-cylindrical fitting with hook-shaped groove 5b U-shaped fitting Hole in 5b1U type metal fitting 5c Similarly, bolt 5d Similarly, nuts 6. Ladder support poles 7 Steps on a stepladder 8 step ladders
Claims
1. In the present invention, the fall prevention pole for a stepladder is a device that is attached to the top of the support column of a stepladder, consisting of three or four legs, and is attached to two or more support columns. The aforementioned fall prevention pole for a stepladder mainly consists of a fixed pipe, a first fixing device, a second fixing device, a third fixing device, a sliding pole, and a gap-preventing cap to minimize the gap at the contact surface with the sliding pole. The first, second, and third fixing devices are attached to the side of the support column of the stepladder, and the fixed pipe is set on the top of the support column by the first and second fixing devices. A single sliding pole slides freely within the fixed pipe as its axis, and the lower end of the sliding pole is equipped with a knob bolt for operation and fixing, and the hook-shaped groove on the back of the second fixing device is through which the knob bolt passes. By extending the sliding pole higher than the top plate of the stepladder, the lower end of the sliding pole simultaneously fits into the hook-shaped groove of the second fixing device, and this shape is tightened and fixed with the knob bolt.
2. The fall prevention pole for a stepladder according to claim 1, wherein when the slide pole is extended higher than the top of the stepladder, the knob bolt at the lower end of the slide pole passes through a hook-shaped groove provided on the back of the second fixing device, and when the lower end of the slide pole stops at the position of the recess in the hook-shaped groove, the contact point with the second fixing device is tightened and fixed with the knob bolt, thereby stabilizing the tip of the slide pole.
3. The fall prevention pole for a stepladder according to claim 1 or 2, wherein when the slide pole is stored, the knob bolt at the lower end of the slide pole passes through a hook-shaped groove on the back of the third fixing device, and when the lower end of the slide pole stops at the position of the recess in the hook-shaped groove, the contact point with the third fixing device is tightened and fixed with the knob bolt.