Fall prevention pole for step ladder

Abstract

To provide a safety auxiliary device to solve the problem that working on the top level of a step ladder 8 involves danger.SOLUTION: A fall prevention pole is set on a support 6 of a four-legged aluminum step ladder 8, and is composed of a slide pole 1, a fixed pipe 2, a gap prevention cap 2a, a first fixing device 3, a second fixing device 4, and a third fixing device 5. The fixed pipe 2 is fixed to the support 6 by the first fixing device 3 and the second fixing device 4. The slide pole 1 slides up and down through the fixed pipe 2, and a knob bolt 1a is attached to the lower end. The slide pole 1 is operated by the knob bolt 1a. A hook-shaped groove 4a2 through which the knob bolt 1a passes is provided in the fixing device 4, and extension and fixing are performed via this groove. When the legs of the step ladder 8 are opened, the slide pole 1 extends and becomes a catch rod that prevents falls, ensuring safety when working at height, and when the legs are closed, the lower end of the slide pole 1 is tightened and fixed at the recessed position of a hook-shaped groove 5a2 of a third fixing device 5 by the knob bolt 1a, forming a safety auxiliary device for the step ladder 8.SELECTED DRAWING: Figure 17

Description

[Technical field]

[0001] This invention relates to a stepladder fall prevention pole, which is a device attached to the upper part of a stepladder's support pole to prevent falls that occur when working on the upper level of the stepladder. [Background technology]

[0002] Conventionally, stepladders have three or four supports and are designed to be used on a horizontal surface. When using stepladders, it is prohibited to climb onto the upper section or top plate of the stepladder to work, but depending on the work site, it may be unavoidable to do so. If the object to be worked on is lower than the top plate, the supports provide support and safety is ensured, but if it is higher, there is nothing to hold on to, which is dangerous. As a prior example, there is a safety bar on the top step of a stepladder (see, for example, Patent Document 1) that was devised to make working at heights safer by climbing onto the top step of the stepladder. [Prior art documents]

[0003] [Patent Document 1] Patent Publication No. 9-189185 Summary of the Invention [Problem to be solved by the invention]

[0004] In the safety bar at the top of the stepladder described in Patent Document 1, the fixing devices and attachment belts are simple and lack safety and convenience, making it unsafe to use when working at heights.In addition, when the legs of the stepladder are closed, the safety bar feels uncomfortable and lacks integration with the stepladder support.

[0005] The present invention seeks to solve the problems associated with such conventional configurations, and aims to make it possible to work at heights safely by attaching a fall prevention pole to a stepladder, which can be easily attached to a commonly available type of stepladder (used type), thereby ensuring safety when working on objects that are higher than the top plate of the stepladder. [Means for solving the problem]

[0006] The fall prevention pole of the stepladder in the present invention is a device that is attached to the upper part of the support posts of a stepladder consisting of three or four legs, and is also attached to the support posts at two or more points. The fall prevention pole of the stepladder is mainly composed of a fixed pipe, a first fixing device, a second fixing device, a third fixing device, a slide pole, and a gap prevention cap, and is formed by attaching the first fixing device, the second fixing device, and the third fixing device to the side of the support pole of the stepladder, and the fixed pipe is set to the top of the support pole by the first fixing device and the second fixing device. A single slide pole slides freely around the fixed pipe as an axis, and a knob bolt is provided at the lower end of the slide pole for operation and fixing, and a hook-shaped groove on the back of the second fixing device is passed through by the knob bolt. By extending the slide pole higher than the top plate of the stepladder, the lower end of the slide pole simultaneously fits into the hook-shaped groove of the second fixing device, and this shape is characterized in that it is tightened and fixed by the knob bolt.

[0007] In addition, when the slide pole is extended higher than the top plate of the stepladder, the knob bolt at the lower end of the slide pole passes through a hook-shaped groove formed on the back of the second fixing device, and when the lower end of the slide pole stops at the position of the depression formed by the hook-shaped groove, the contact point with the second fixing device is tightened and fixed by the knob bolt, thereby stabilizing the tip of the slide pole.

[0008] In addition, 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 depression formed by the hook-shaped groove, the contact point with the third fixing device is tightened and fixed by the knob bolt. Effect of the Invention

[0009] As described above, in the stepladder fall prevention pole of the present invention, the slide pole is set on the top of the stepladder support and moves up and down around a fixed pipe as the main axis. By extending its tip higher than the top plate of the stepladder and fixing the lower end, when working at heights, the worker can hold on to the pole, ensuring body balance and allowing work to be carried out safely with peace of mind, which is the effect achieved by the device. [Brief description of the drawings]

[0010] [Figure 1] Side view of the slide pole [Diagram 2] 2 Side view of fixed pipe [Diagram 3] 3 Exploded view of the first fixture [Figure 4] 4 Exploded view of the second fixing device [Diagram 5] 5 Exploded view of the third fixing device [Figure 6] Exploded plan view of the first fixture [Figure 7] Exploded plan view of the second fixture [Figure 8] Exploded plan view of the third fixed view [Figure 9] 3 Plan, side and overhead views of the first fixture [Figure 10] 4 Plan, side and overhead views of the second fixture [Figure 11] 5 Plan, side and overhead views of the third fixture [Figure 12] 4 Plan view of the stepladder support with the fixed pipe, slide pole and second fixing device as a set [Figure 13] 4. A cross section in which a fixed pipe, a slide pole, and a second fixing device are attached to the support of a stepladder [Figure 14] A plan view of the stepladder support with the fixed pipe, slide pole, and second fixture set fastened with a knob bolt. [Figure 15] Similarly, cross section [Figure 16] A diagram showing the fall prevention pole set on the stepladder's support and the slide pole lowered and stored. [Figure 17] A diagram showing a stepladder with a fall prevention pole attached to the support and a slide pole extended high MODE FOR CARRYING OUT THEINVENTION

[0011] The stepladder fall prevention pole of the present invention is a device attached to the support part of a stepladder consisting of three or four legs. In the fall prevention pole, a single slide pole slides up and down via a fixed pipe provided at the upper front part of the stepladder support. The slide pole is extended higher than the top plate of the stepladder and its lower end is fixed, thereby achieving its function. The stepladder fall prevention pole is composed of the fixed pipe, the slide pole, a knob bolt, a first fixing device, a second fixing device, a third fixing device and a gap prevention cap.

[0012] The fixed pipe is set at the upper right side of the front of the stepladder support, and the single sliding pole slides up and down through the fixed pipe, with the fixed pipe as its axis. The front width of the stepladder support and the thickness of the fixed pipe are the same size.

[0013] The fixed pipe is made of a metal pipe with a diameter of 24 mm and a length of 600 mm, and a gap prevention cap is provided at the tip of the fixed pipe to minimize the gap at the contact surface with the slide pole. Its role is to prevent rattling of the contact surfaces when the slide pole is extended upward. The tip of the fixed pipe is fixed to a support pole of the stepladder with a first fixing device, and the lower end is fixed to a support pole of the stepladder with a second fixing device. It is the axis for the up and down movement of the slide pole, and as such the fixed pipe plays an important role.

[0014] The slide pole is a member that slides up and down through a fixed pipe attached to the upper right front part of the stepladder support, and has a knob bolt attached to its lower end. When the slide pole is extended upwards to open the stepladder, the knob bolt tightens the contact surface between the lower end of the slide pole and the second fixing device with the knob bolt through a hook-shaped groove on the back of the second fixing device, thereby stopping its movement and fixing the tip of the slide pole. When the stepladder is closed, when the slide pole is extended downwards, the knob bolt tightens the contact surface between the lower end of the slide pole and the third fixing device with the hook-shaped groove on the back of the third fixing device, thereby stopping its movement and becoming one with the stepladder.

[0015] The slide pole is a metal pipe with a diameter of 22 mm and a length of 1,300 mm, with a knob bolt set at the lower end of the slide pole, and it moves together with a hook-shaped groove as a base point.The operation is performed by the knob bolt, and it is the main function of the fall prevention pole.

[0016] The first fixing device consists of a semi-cylindrical metal fitting and a U-shaped metal fitting. The fixed pipe is set at the upper right front part of the stepladder support, the U-shaped metal fitting is fitted to the side of the stepladder support via the support, and then the semi-cylindrical metal fitting is wrapped around that from above. There are two 6mm diameter holes at each joint, and the top of the fixed pipe is fixed to the support by tightening bolts and nuts through these holes. The semi-cylindrical metal fitting is a semi-cylindrical metal fitting with a circumference of 110 mm x height of 45 mm x width at the bottom end of 28 mm, which is formed into a single piece by wrapping the fixed pipe from above and combining it with the U-shaped metal fitting, and has two 6 mm diameter holes on the lower contact surface.

[0017] The U-shaped metal fitting is a square fitting with an inner base diameter of 24 mm, height of 68 mm and width of 30 mm, with two 6 mm diameter holes at the tip. With a fixed pipe set at the top right front of the stepladder support, the U-shaped fitting is fitted onto the side of the support and then wrapped around with a semi-cylindrical fitting from above to form a one-piece unit.

[0018] The second fixing device is made up of a semi-cylindrical metal fitting and a U-shaped metal fitting, and consists of a fixed pipe set at the upper right front part of the stepladder support, with the U-shaped metal fitting fitted into the lower end of the pipe via the side of the support, and then wrapped in the semi-cylindrical metal fitting from above. Two 6mm diameter holes are provided at each joint, and the lower end of the fixed pipe is fixed to the support by tightening bolts and nuts through these holes.

[0019] The semi-cylindrical metal fitting has a circumference of 110 mm, height of 45 mm and bottom width of 28 mm, and is formed into a single unit by wrapping the fixed pipe from above and combining it with the U-shaped metal fitting. A hook-shaped groove is provided on the back of the semi-cylindrical metal fitting, and this groove is for the knob bolt attached to the slide pole to pass through. The lower end of the slide pole is set into the hook-shaped groove, thereby facilitating operation of the knob bolt. There are also 6 mm diameter holes provided in two places on the contact surface at the bottom.

[0020] The U-shaped metal fitting is a square fitting with an inner base diameter of 24 mm, height of 68 mm and width of 50 mm, with two 6 mm diameter holes at the tip. A fixed pipe is set at the top right front of the stepladder support and fixed to the support with the U-shaped fitting, and then it is wrapped around the semi-cylindrical fitting to form a one-piece unit.

[0021] The third fixing device consists of a semi-cylindrical metal fitting and a U-shaped metal fitting, and is set in the center of the front right side of the stepladder support, and its role is to store and fix the lower end of the slide pole and the knob bolt.

[0022] The semi-cylindrical metal fitting is a semi-cylindrical metal fitting with a circumference of 110 mm, height of 45 mm, and width at the bottom of 28 mm, which is formed into a single piece by wrapping the fixed pipe from above and combining it with the U-shaped metal fitting. The back of the semi-cylindrical metal fitting has a hook-shaped groove which is provided at the bottom end of the slide pole and through which the knob bolt passes, and there are two 6 mm diameter holes on the contact surface at the bottom.

[0023] The U-shaped metal fitting is a square fitting with an inner base diameter of 24 mm, height of 68 mm and width of 40 mm, with two 6 mm diameter holes at the tip. It is set in the centre of the right front part of the stepladder support and then wrapped around and combined with a semi-cylindrical fitting; it functions by being fixed in place using bolts and nuts that are fastened through the holes at the tip.

[0024] Hereinafter, an embodiment of a fall prevention pole for a stepladder will be described with reference to Figs.

[0025] The fall prevention pole of the stepladder is composed of a slide pole (Fig. 1), a fixed pipe (Fig. 2), a first fixing device (Fig. 3), a second fixing device (Fig. 4), a third fixing device (Fig. 5), a knob bolt (Fig. 1-1a), and a gap prevention cap (Fig. 2-2a).

[0026] When setting up a stepladder's fall prevention pole, it is preferable to set it on the upper right front part of the ladder support.

[0027] The U-shaped metal fitting (Fig. 3-3b) which is the first fixing tool (Fig. 3) is attached to the top of the stepladder support, and then the U-shaped metal fitting (Fig. 4) which is the second fixing tool (Fig. 4) is attached to the step and contact point which is the second step of the top of the support. The fixing pipe (Fig. 17-2) is set at these two fixing tool positions. The fixing pipe (Fig. 13-2) in the set form is wrapped from above with the semi-cylindrical metal fitting (Fig. 13-4a) and combined with the U-shaped metal fitting (Fig. 13-4b) to form the support part (Fig. 12) in the embraced state. 1 and Figure 5b 1By tightening the bolt (Fig. 5c) and nut (Fig. 5d) through the fixing pipe, the fixed pipe is fixed to the support part (Fig. 13-6) by the fasteners (Fig. 17-3 and Fig. 17-4).

[0028] The slide pole Fig. 12-1 is set via a fixed pipe Fig. 12-2, and slides up and down inside this pipe, with this fixed pipe as the axis. A gap prevention cap Fig. 2a or Fig. 17-2a is attached to the tip of the fixed pipe Fig. 2, which is intended to minimize rattling of the contact surfaces when the slide pole Fig. 17-1 is extended high. A knob bolt Fig. 1-1a is attached to the lower end of the slide pole Fig. 1-1, and they are an integrated unit that move simultaneously in the same direction. The movement of the slide pole is controlled by the knob bolt.

[0029] The second fixing device (Fig. 4) is a semi-cylindrical metal fitting (Fig. 4-4a) with a hook-shaped groove on the back (Fig. 4-4a) 2 It is composed of the following: This groove is for the knob bolt (Fig. 1-1) to pass through. When the slide pole (Fig. 1) is extended upward, the knob bolt (Fig. 1-1a) passes through the hook-shaped groove (Fig. 4-4a). 2 By turning it to the right it stops at the depression which is the end of the groove, and by tightening the knob bolt Fig. 15-1a at this point the movement of the slide pole Fig. 17-1 stops and its tip becomes stationary. Therefore, when working at heights, the extended slide pole Fig. 17-1 can be used as an auxiliary device to prevent falls, and by holding on to it the body balance can be maintained, allowing work to be done safely with peace of mind.

[0030] When closing the stepladder, lower the slide pole (Fig. 16-1) to the third fixing device (Fig. 16-5) position, and the knob bolt (Fig. 1-1a) at the bottom end is inserted into the hook-shaped groove (Fig. 5-5a). 2 When the ladder stops in a depression, the knob bolt (Figure 16-1a) can be tightened to make the fall prevention pole one piece with the stepladder. [Explanation of symbols]

[0031] 1 Slide pole 1a Knob bolt 1b Knob bolt insertion hole 2 Fixed pipe 2a Gap prevention cap 3 First fixture 3a Semi-cylindrical fitting 3a 1 Semi-cylindrical metal fitting hole 3b U-shaped fitting 3b 1 U-shaped bracket hole 3c Similarly, Bolt 3d Similarly, nuts 4 Second fixture 4a Semi-cylindrical metal fitting 4a 1 Semi-cylindrical metal fitting hole 4a 2 Hook-shaped groove in semi-cylindrical metal fitting 4b U-shaped bracket 4b 1 U-shaped bracket hole 4c Similarly, Bolt 4d Similarly, nut 5 Third fixture 5a Semi-cylindrical fitting 5a 1 Hole in semi-cylindrical fitting 5a 2 Hook-shaped groove in semi-cylindrical metal fitting 5b U-shaped bracket 5b 1 U-shaped bracket hole 5c Similarly, Bolt 5d Similarly, nut 6. Stepladder Support 7 Stepping on a stepladder 8. Stepladder

Claims

1. The fall prevention pole of the stepladder in the present invention is a device attached to the upper part of the support posts of a stepladder consisting of three or four legs, and is also attached to the support posts at two or more points. The stepladder fall prevention pole is mainly composed of a fixed pipe, a first fixing device, a second fixing device, a third fixing device, a slide pole, and a gap prevention cap, and is formed by attaching the first fixing device, the second fixing device, and the third fixing device to the side of the support pole of the stepladder, and the fixed pipe is set to the top of the support pole by the first fixing device and the second fixing device. A single slide pole slides freely around the fixed pipe as an axis, and a knob bolt is provided at the lower end of the slide pole for operation and fixing, and a hook-shaped groove on the back of the second fixing device is through which the knob bolt passes. By extending the slide pole higher than the top plate of the stepladder, the lower end of the slide pole simultaneously fits into the hook-shaped groove of the second fixing device, and this shape is tightened and fixed by the knob bolt.

2. This fall prevention pole for a stepladder is characterized in that when the slide pole is extended higher than the top plate position 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 depression formed by the hook-shaped groove, the contact point with the second fixing device is tightened and fixed by the knob bolt, thereby stabilizing the tip of the slide pole.

3. This fall prevention pole for a stepladder is characterized in that, 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 depression formed by the hook-shaped groove, the contact point with the third fixing device is tightened and fixed by the knob bolt.

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