JPH074799U - Safety rod for stepladder - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In order to prevent the danger of working at height using a stepladder, by combining a safety rod as an auxiliary tool with the stepladder, it can be securely fixed and Make it safe and easy to work with. [Structure] The safety rod A is a rod-shaped member that is separate from the stepladder and has a single or a plurality of upright portions and bent legs, and is used in combination with the stepladder. The upright part must be in contact with the upper two steps adjacent to the stepladder, and the foot part must be in contact with the lower step of the stepladder to securely fix the stepladder and the safety rod A by the lever principle. And
Depending on the case, chains, strings, and fittings are used together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention combines a main body of a stepladder and a safety rod to expand and secure the safety area and work area of stepladder work in high-altitude work such as fluorescent lamp replacement, signboards, and electrical wiring.

[0002]

[Prior art]

 As shown in Fig. 2, the conventional stepladder has the legs contacting at four points on the floor without a safety rod, the angle between the leg and the horizontal plane is 75 degrees or less, and the folding type has the angle between the leg and the horizontal plane. In order to keep work accurately, we use one with a metal fitting to prevent opening. To perform the work safely, prepare a stepladder that matches the height, and the second step from the top is the appropriate work position. Therefore, I have been prohibited from climbing to the top.

[0003]

[Problems to be solved by the device]

 The work area for work in high places is not constant in height depending on the structure and the object, and even if it is prepared in advance, the stepladder will be a little taller, or if it goes up to the top plate of the stepladder, the work can be done without problems. It is often the case that you don't prepare a stepladder that suits your height, and you climb up to the top, causing a crash at that moment. Even if you climb up to the top, it is unstable to work as shown in Fig. 8. There was a problem of causing a crash. Therefore, as a simple means, one or a plurality of safety rods in Fig. 1 are used, and as shown in Fig. 9, the above-mentioned drawbacks are eliminated by supporting them.

[0004]

[Means for Solving the Problems]

 Generally, when working on scaffolding, etc., a safety belt is used to prevent the fall. However, even with this stepladder, a safety rod is used instead of the safety belt, and it is inserted into the main body of the stepladder to keep it in place. By using the principle of leverage, it is designed so that it can be safely and easily moved up and down to the top plate, working position, and work on the top plate by simply fixing it. The structure is simple and the upright part and legs are It is composed of parts and is lightweight, not bulky, and easy to carry.

Whether the safety rod is a single rod or a plurality of safety rods, it can be sufficiently fixed only by contacting it with the stepladder main body drawings 2 (1) (2) (3). First, insert a safety rod between (1) and (2), stand vertically as shown in Fig. 2, and place the foot on (3) while making close contact with the tread of Figs. 2 to 4 (1) and (2). Put it on the tread. 3 and 4, in the case of the safety rod alone, the safety rod and the stepladder are connected by chains, strings, fittings, etc., so that the fixing is more complete. In the case of multiple pieces, they are completely fixed, so no chains, strings or fittings are required. Therefore, it becomes easy to raise and lower the top plate of the stepladder, and the safety rod can be used instead of the handrail when moving up and down, and when it is about to fall, the safety rod can be prevented from falling.

To release the fixation, the safety rod can be easily removed by pushing the fixing body on the opposite side of the foot upward with the lever. For those with low frictional resistance, you only have to push by hand.

[0007] Thus, the structure is simple and the material can be selected from common ones, so that it can be compactly stored together with the stepladder. In the example of Fig. A-1, a pipe with a substantially square iron cross-section is used, a mosquito-shaped hole is made in the upright portion, and it is fitted to the protrusion of the existing stepladder stopper, and the end is wound with a chain. Although it is stored, the safety rod can be stored neatly by simply hooking the foot on the bottom of the stepladder.

[0008]

[Action]

 The safety rod is fixed by placing its fixed body in a fixed position on the stepladder.

In FIG. 4, if the safety rod attempts to rotate to the right with (1) as the fulcrum, the location of (2) will obstruct the rotation and to rotate to the left with (2) as the fulcrum. If this is done, the legs of (3) hinder the rotation. Moreover, since it is better for the contact portion to have a higher frictional resistance, a square or a circle is better than a circle for better fitting or multi-face contact.

[0010] As for the roll prevention in Fig. 3, if chains or strings and fittings as shown in Fig. 5 are used, they can be easily fixed at any position between columns, but metal fittings such as a commercially available umbrella stand are used. In this case, metal fittings are attached to the stepladder fixed part, so it is limited to a fixed position between the columns. In the case of multiple safety rods, there is no rolling due to the large frictional resistance, and there is no need for chains, strings or fittings.

In this way, since the safety rod is firmly fixed, it is not easy to release the fixing. To remove it, remove the fitting or remove the chain or string wrapped around the stepladder. If the fixed body on the opposite side of the foot is lifted with a lever, the stairs in the middle serve as a fulcrum and can be easily removed. In Fig. A-1, the foot is increased by one, and it has two functions of fixing and unlocking, but in Fig. 3 and Fig. 4, if the foot is lifted up, the safety rod can be easily fixed. Can be removed.

[0012] Thus, the structure is extremely simple, and materials such as common metal, wood, bamboo, synthetic resin, etc. can be selected, and since it is not bulky, it can be carried on the stepladder at any time and can be carried at any time. .

[0013]

【Example】

 Example 1 Example 1 will be described with reference to the drawings. 1 to 4, the safety rod has a length of 1500 mm and a wall thickness of about 0.5 to 1.0 mm formed by sheet metal processing using, for example, an iron metal plate, and has a square cross section of 40 mm on a side. It has a cylindrical shape and is made up of an upright part and two legs, but it may have one leg. In the example, the feet are open at right angles to each other, and there is a chain-tethered hole cut in an inverted T shape at each tip that is off the stepping surface. There is also a mossy-shaped hole in the upright part in the longitudinal direction that is continuous with the foot part. Each of these is a part that connects the chain, but it is connected to the stepladder, and the convex part of the stepladder stopper is used. It is also used when locking.

(Fixing) In this method of use, the safety rod diagram 1 is inserted into the gap between the top plate of FIG. At the tread of step (3), secure the parts so that the safety rod and the stepping tread are alternately combined. Therefore, if there are two adjacent upper stairs and one lower step, the combination is free. Then, a chain is stretched to further secure the fixation. Insert the hinge-shaped metal fitting at the end of the chain into the notches shown in Fig. 1 (a) and (b), and wind the opposite end of the chain around the stepladder column as shown in Figs.

(Release) Remove the wound chain, lift the foot part that is not in contact with the tread surface, and press the upright part in the direction of the counterclockwise arrow shown in FIG. 4 to release the fixation. .

(Storing) Since the safety rod is provided with a comb-shaped hole in the slit (b) of FIG. 1, the protrusion of the existing opening stop metal fitting is connected to this hole in FIGS. 2 and 4. To do. Then, the upright part of the safety rod is placed along the prop of the stepladder, and is connected by chain winding. The chains are stored by connecting them using the inverted T-shaped holes and the kokeshi-shaped holes shown in FIG.

Second Embodiment FIG. B-2 is a perspective view showing a second embodiment. In the case of two safety rods, a round iron pipe is used for fixing to the stepladder, but the chains, strings, and fittings described in the first embodiment are not necessary because they are in multiple contact. When using the top 3 steps of a stepladder to climb up to the top plate, the bar next to the top of the safety rod is located on the abdomen of the body, and both hands can be used freely. In Figure A-2, a horizontal bar is attached and used as a scaffold or a backrest when climbing to a position higher than the top plate. As shown in Figure 6, an annular stopper and a horizontal bar are alternately placed on the upright portion. It can also be combined and slid to make a detachable assembly type, and if the horizontal bar is removed, it can be disassembled into a single safety rod as shown in Figure A-1. In the assembly type, the safety rods on both sides of the stepladder interfere in the case of climbing to a position higher than the top plate of the third embodiment, so that one side is released to facilitate climbing from one side. The safety rod in Figure B-2 is stored for convenience in carrying around by putting the foot on the inside of the stepladder, closing the stepladder as it is, and forming a sandwich.

Third Embodiment FIG. 7 is a perspective view showing a third embodiment. Since a stepladder without a top plate will use the lower three steps, if the safety bar diagram A-2 of Example 2 is inserted into the stepladder and the horizontal bar and the apex of the stepladder are aligned, it is the same as the stepladder with the top plate. You can work like Furthermore, when climbing above the top plate, insert another safety rod shown in Figure A-2 on the opposite side of the stepladder into which the safety rod was inserted, and adjust the height of the horizontal bars to the left and right. If you set them so that they face each other, you can use the horizontal bar to climb to a position above the top plate, with the same effect as raising the stepladder. In the work, a 2.7-meter-high stepladder is used, and the 5-meter-high fluorescent lamp is replaced.

Example 4 If a joint metal fitting is attached to the upright portion of the safety rod or a horizontal bar, and a long rod is combined with this, it becomes a ceiling, a wall, or a tree retainer, and it is possible to prevent the stepladder from falling.

Example 5 As for the shape of the safety rod, when viewed from the front, Example 1 is a square and linear type, and Example 2 is a round type and a rectangular type with a horizontal bar attached. It is also possible to integrally form a triangular shape, an inverted triangle shape, a U-shape, a Y-shape, an O-shape, etc., and various foot shapes such as single or multiple endless shapes can be selected depending on the case.

Advantages In the conventional stepladder work, the working position shown in FIGS. 2 to 4 is the limit of the work area, and the climbing to the top plate is prohibited, and unless the stepladder corresponding to the height is prepared, it is a safe work. I couldn't. For example, building companies, etc., have many elderly people and have always been at risk of crashing, such as replacing fluorescent lamps at high altitudes, window cleaning work, and roof gutter cleaning. Therefore, to prevent this, a safety rod that is easy to handle, can be compactly stored, and can be carried is created as a stepladder assisting device, and is attached to the stepladder during high-altitude work to eliminate unreasonable postures and work operations. By making it easier and preventing a fall accident, you can work with peace of mind.

Effect of the Invention Since the present invention is configured as described above, it has the following effects.

Anyone can easily go up and down to the stepladder top plate.

Work on the top plate, work at the work position, and work of transferring articles can be performed easily.

The safety of work in high places using a stepladder is increased (a safety belt can be substituted).

It is possible to prevent a fall.

It is not necessary to prepare an extra stepladder because one stepladder can perform work with a spread of three steps.

Since it is not bulky, it is convenient to carry alone or stored in a stepladder, and the work area in the time space is expanded.

It is easy to attach, remove, and store, and can be securely attached.

Since the structure is simple, common materials can be selected and the cost is low.

The ban on the top plate can be lifted.

Applicable to any type of stepladder.

It is expected that a new stepladder will be integrated into a process as a necessity and commercialized as a stepladder with a safety rod.

The conventional two-person work can be performed by one person.

Since one safety rod can be assembled into two safety rods, it can be used properly according to the purpose of use.

The top three steps of the stepladder, which are frequently used, can be effectively used.

A plurality of safety rods having horizontal bars can be combined in pairs to form a scaffold above the top board.

If a commercially available joint fitting is added to the safety rod, the rod can be used to prevent the stepladder from falling.

Since the stepladder can be moved while the safety rod is set, continuous work can be performed on the adjacent land.

The tip of the safety rod having the protrusion can be used for loading.

[Brief description of drawings]

FIG. 1 is a perspective view of a safety rod only.

FIG. 2 is a perspective view in which a safety rod is fixed to a stepladder.

FIG. 3 is a front view in which one safety rod is fixed to the stepladder.

FIG. 4 is a side view in which one safety rod is fixed to the stepladder.

FIG. 5 is a reference view of a fitting.

FIG. 6 is a reference diagram of disassembling and assembling when the safety rod as in FIG.

FIG. 7 is a reference diagram showing Example 3.

[Explanation of symbols] A Safety rod, upright foot, side horizontal bar, b Chain connection part Chain, B stepladder 1 Top plate 2 Working position 3 Tread 4 Opening stop 5 Convex 6 of opening stop 6 Strut

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 23, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 8

[Correction method] Added

[Correction content]

[Fig. 8] Fig. 8 is a diagram showing a state in which the fluorescent lamp is replaced due to an unavoidable posture while climbing up to the top plate in a high place work using a stepladder without using a safety rod, but the foot is wobbling in an unnatural posture.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Figure 9

[Correction method] Added

[Correction content]

[Fig. 9] Fluorescent lamps are replaced on the top plate by the method of Fig. B-2 using a safety rod, but I am satisfied because my body is stable and I can use both hands freely. It is a diagram of safe work.

Claims (1)

[Scope of utility model registration request] 1. A safety rod, which is formed separately from a stepladder, has a single or a plurality of long rods, has an upright portion and bent legs, and is a combination set with a stepladder.