JP2015175199A - stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stepladder capable of making a worker hardly stand or sit on a top board in use and capable of preventing the worker from falling from the top board.SOLUTION: In a stepladder 1, two ladder frames 5, which each have a plurality of rungs 3 arranged between two studs 2 and which each have a top board 4 attached to an upper end between the studs 2, are provided, and upper ends of the studs 2 of the two ladder frames 5 are pivotally attached by a hinge 6. An arc-shaped cross-section cushion member 7 is attached onto the top board 4 of one ladder frames 5 of the two ladder frames 5 in such a manner that an outer peripheral surface is directed upward.

Description

  The present invention relates to a stepladder used at various work sites used as a scaffold that can be easily handled at a building site.

Conventionally, a stepladder is a full-scale work that is performed at a new construction site, such as attaching equipment to the finished ceiling, finish painting work, inspection work in existing rooms and machine rooms, electrical wiring work, small-scale renovation work, etc. It is widely used because of its convenience as an easy-to-handle scaffold suitable for work at a slightly higher position, although it does not go up to work at high altitudes, in the case of construction that is not an environment where a single tube scaffold or rolling tower can be used ing.
Construction sites use temporary scaffolding materials certified by the Temporary Industry Association to prevent occupational accidents by setting necessary structural standards for temporary structures for construction work and their components, and stepladders are also in that category. belong to. The temporary industry association certified stepladder is an aluminum alloy stepladder with a durable structure that can withstand business use. At the construction site, a ladder stepladder is usually not used but a dedicated stepladder is used to prevent a crash caused by inappropriate use of temporary scaffolding.
In general, as shown in FIG. 8, a stepladder 1 used in various work sites has a plurality of step bars 3 disposed between two pedestals 2 and a top plate 4 attached to the upper end between the pedestals 2. The two ladder frames 5 are provided, and the upper ends of the leg posts 2 of the two ladder frames 5 are pivotally attached by a hinge 6.

  The top plate 4 is formed in a wide flat plate shape and can be used as a temporary storage place for work tools and the like. The safety of the use of the stepladder 1 is restricted due to the safety and safety of work at a height that does not go to the height work exceeding 2 m, which requires the convenience of the stepladder 1 and the safety belt at the construction site. Regarding the use of the stepladder 1 having a height exceeding 1.2 m, it is prohibited to work while standing on or straddling the top 4. In the case of the stepladder 1 without a handrail, it is assumed that the step frame 3 is used to support the body with the ladder frame 5 on the top, and the balance on the top 4 is lost. Because there is nothing to support. Therefore, the top plate 4 is limited to use of a temporary storage place such as a work tool.

  Also, a plurality of stepladders 1 are juxtaposed, and the stepladder 1 is mounted by placing a scaffolding plate (not shown) between the top plates 4 of the stepladders 1 arranged side by side or between the crosswalks 3. Sometimes used as a scaffold. The distance between the stepladders 1 is 1.8 m or less, a plywood scaffolding board with a thickness of 25 mm or more and a width of 24 cm or more is used, and the scaffolding board is used except for the case where it is passed over the stepping board 3 of three or more stepladders 1 Fix to 3 with a rubber band.

  In addition, there exists patent document 1 as a thing which shows the general technical level about the ladder combined steplader utilized in relation to the stepladder 1 of the structure as shown in FIG. This ladder combined stepladder is different from the dedicated stepladder shown in FIG. 8. When the ladder combined stepladder is used as a ladder, each ladder frame must be rotated so that the two ladder frames must be positioned in a straight line. The upper end of the channel is narrow and has an inverted U-shaped channel material, and the top plate is not affixed so that it does not interfere with the operation of opening the hinge. In patent document 1, when using as a stepladder, a top plate does not become horizontal, does not become a wide flat plate shape, and does not make the body of temporary storage places, such as a work tool.

JP 2008-297705 A

  As mentioned above, it is well known at the construction site that standing on or straddling the top plate 4 is a prohibited matter in using a stepladder that allows work that does not use a safety belt and is not work at a height exceeding 2 m. In spite of this, with conventional stepladders, the operator stands on the top plate 4 formed into a wide flat plate for easy reasons such as not having a high alternative stepladder at hand or being careful. Since it is relatively easy to work or sit on the top plate 4 so as to straddle the top of the stepladder 1, the balance is lost when the operator stands out during work. It may fall from the plate 4 or fall with the stepladder, and a countermeasure has been desired.

  The present invention has been made in view of the above-described conventional problems, and provides a stepladder that makes it difficult for an operator to stand or sit on the top plate during use and prevents the operator from falling from the top plate. It is something to try.

The present invention includes two ladder frames in which a plurality of step bars are arranged between two pedestal columns and a top plate is attached to the upper end between the pedestal columns, and the upper ends of the pedestal columns of the two ladder frames are provided. In the stepladder that is pivotally attached to the hinge,
The stepladder is characterized in that a cushion member having an arc-shaped cross section is mounted on the top plate of one of the two ladder frames so that the outer peripheral surface faces upward.

  In the stepladder, the cushion member includes a bottom plate portion placed on the top plate, and a groove provided with a stopper portion that rises from both edge portions of the bottom plate portion and prevents the cushion member from expanding in the radial direction. It is preferable that it is fitted on the mold base and attached to the top plate together with the groove type base.

  In the stepladder, the hinge has an eye-shaped bracket that protrudes upward when the stepladder is used, and the groove-type pedestal is hooked on the bracket at one end and a step between the hinge and the pedestal at the other end It is preferable that the top plate is detachably attached by a fastening band attached to the pedestal.

  The fastening band includes a stretchable elastic band that presses the groove-type pedestal with the cushion member fitted thereto against the top plate with a force to shrink the pedestal toward the pedestal, and an elastic band provided at one end of the elastic band and above the hinge It is preferable to include a hook that is hooked to a bracket that projects to the outside, and a clamp that is provided at the other end of the elastic band and is attached to the pedestal.

  According to the stepladder of the present invention, it is possible to make it difficult for an operator to stand or sit on the top plate during use, and to achieve an excellent effect that the operator can be prevented from falling from the top plate.

It is a perspective view which shows the 1st Example of the stepladder of this invention. It is one side view which shows the 1st Example of the stepladder of this invention, Comprising: It is the II-II direction arrow line view of FIG. It is another side view which shows the 1st Example of the stepladder of this invention, Comprising: It is the III-III direction arrow directional view of FIG. It is a disassembled perspective view which shows the cushion member, groove type base, and fastening band in 1st Example of the stepladder of this invention. It is another side view which shows the state of the leg | foot at the time of standing on the top plate in the 1st Example of the stepladder of this invention. It is another side view which shows the state of the lower half body at the time of sitting on the top plate in 1st Example of the stepladder of this invention. It is a perspective view which shows the 2nd Example of the stepladder of this invention. It is a whole perspective view which shows an example of the conventional stepladder.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 6 show a first embodiment of a stepladder according to the present invention. In the figure, the same reference numerals as those in FIG. 8 denote the same parts, and the basic structure is the conventional one shown in FIG. The first embodiment is characterized in that a cushion member 7 having a circular arc cross section is placed on the top plate 4 of one ladder frame 5 as shown in FIGS. It is in the point where it was attached so that the surface might face up.

  In the case of the first embodiment, the cushion member 7 is fitted on the grooved base 8 as shown in FIGS. The groove-type pedestal 8 includes a bottom plate portion 8a placed on the top plate 4 and a stopper portion 8b that rises from both edges of the bottom plate portion 8a and prevents the cushion member 7 from expanding in the radial direction. I have. The cushion member 7 is attached to the top plate 4 together with the grooved base 8.

  The groove-type base 8 is hooked to an eye-shaped bracket 6 a that projects upward from the hinge 6 at one end side, and is attached to the leg pillar 2 at the other end using a step with the leg pillar 2 of the hinge 6. A fastening band 9 is detachably mounted on the top plate 4.

  The fastening band 9 includes a stretchable elastic band 9a that presses the groove-type pedestal 8 with the cushion member 7 fitted to the top plate 4 with a force of contracting toward the leg column 2, and one end of the elastic band 9a. And a hook 9b that is hooked on an eye-shaped bracket 6a that extends above the hinge 6 and a clamp 9c that is provided at the other end of the elastic band 9a and is attached to the pedestal 2. It is.

  2 and 4, the hook 9b is formed by attaching a first hook member 9e made of steel and a second hook member 9f to a mounting seat 9i of a buckle 9d by fastening members 9g such as bolts and nuts. It has a configuration. The buckle 9d is formed in a rectangular metal plate with two holes 9h into which one end portion of the elastic band 9a can be inserted and turned back, and a mounting seat for the fastening member 9g at the center of the bottom of the metal plate. 9i is projected. One end of the elastic band 9a is inserted and sewed into the two holes 9h of the buckle 9d so that the buckle 9d is attached to one end of the elastic band 9a. The first hook member 9e includes a cylindrical pivotal support portion 9j through which the shaft portion of the fastening member 9g penetrates, and a strip plate portion 9k formed to bend and project from the outer surface of the pivotal support portion 9j in the radial direction. A projection 9u protruding upward is provided in the vicinity of the pivot portion 9j of the band plate portion 9k, and the second hook member 9f has a shaft portion of the fastening member 9g penetrated and the first hook member 9e. A cylindrical pivot portion 9m disposed on the pivot portion 9j of the first hook member 9e and projecting in the radial direction from the outer surface of the pivot portion 9m and bending to the opposite side of the band plate portion 9k of the first hook member 9e. 9n, and a projection 9u protruding above the band plate portion 9k of the first hook portion 9e hits the side surface below the pivotal support portion 9m of the bent band plate portion 9n. And the second plate member 9e of the first hook member 9e and the second hook member 9e Click member 9f belt portions 9n and the protrusion 9u of the strip portion 9k like being always on the side where the bent portion overlaps with another plane of has the role of a stopper. The width dimension of the hook 9b is such that the projection 9u of the band plate portion 9k of the first hook member 9e is in contact with the side surface of the band plate portion 9n of the second hook member 9f. The arrangement with 9f is the largest, and the width dimension becomes smaller as the band plate portion 9k and the band plate portion 9n are arranged so as to overlap in plan view. The strip plate portion 9k of the first hook member 9e and the strip plate portion 9n of the second hook member 9f are overlapped with each other in a plan view with respect to the rectangular opening 6b provided in the eye-shaped bracket 6a of the hinge 6. By inserting the first hook member 9e and the second hook member 9f so that the projection 9u of the band plate portion 9k is in contact with the side surface of the band plate portion 9n. The front end of the strip plate portion 9k of the first hook member 9e and the front end portion of the strip plate portion 9n of the second hook member 9f are hooked on the side member of the bracket 6a. In the arrangement of the first hook member 9e and the second hook member 9f in which the projection 9u of the band plate portion 9k contacts the side surface of the band plate portion 9n, the first hook member 9e and the second hook member 9f are more Since it does not spread, the hook 9b is firmly fixed to the bracket 6a in the direction in which the elastic band 9a contracts.

  As shown in FIGS. 3 and 4, the clamp 9c has a configuration in which a lock clamp member 9q is pivotally attached to a base clamp member 9p so as to be freely opened and closed. The base clamp member 9p is a metal plate that is bent so as to follow the three outer peripheral surfaces of the pedestal 2 and has a hinge portion 9r. The other end of the elastic band 9a is inserted into a hole 9s formed in the metal plate. The base clamp member 9p is attached to the other end of the elastic band 9a by inserting and folding the portion and sewing it. As shown in FIG. 3, the upper end portion of the base clamp member 9 p is in contact with the lower end portion of the hinge 6, and is caught by a step corresponding to the plate thickness of the hinge 6 that is riveted to the outside of the pedestal 2. The upward movement of the pedestal 2 is prevented. The lock clamp member 9q includes a hinge portion 9t that is pin-coupled to the hinge portion 9r of the base clamp member 9p. The lock clamp member 9q projects in the radial direction from the outer surface of the hinge portion 9t, and the pedestal 2 together with the base clamp member 9p. Is a metal plate that is bent so that it can be gripped and released.

  On the other hand, as the cushion member 7, for example, a commercially available protective material for a single pipe called a tiger pipe can be used. The tiger pipe is a protective material in which a polyvinyl chloride film having black and yellow stripes is attached to the surface of a cylindrical polyethylene foam, and is attached to a scaffolding pipe at a construction site, a parking lot pole, etc. It is intended to alert the user and to alleviate the impact at the time of contact. If the cylindrical trappipe is halved, it can be used as the cushion member 7.

  Next, the operation of the first embodiment will be described.

  First, the bottom plate portion 8a of the groove type pedestal 8 to which the cushion member 7 is fitted is placed on the top plate 4 of one ladder frame 5, and in the space formed by the cushion member 7 and the groove type pedestal 8. A hook 9 b provided at one end of the fastening band 9 through which the elastic band 9 a is passed is hooked on a bracket 6 a that extends above the hinge 6. Here, the band plate portion 9k of the first hook member 9e of the hook 9b and the band plate portion 9n of the second hook member 9f are overlapped with each other in a plan view on the opening 6b provided in the bracket 6a of the hinge 6. By reducing the width and inserting it into the opening 6b, and then arranging the first hook member 9e and the second hook member 9f in which the projection 9u of the strip plate portion 9k contacts the side surface of the strip plate portion 9n, It is possible to hook the end of the band plate portion 9k of the first hook member 9e and the end of the band plate portion 9n of the second hook member 9f on the side member of the eye-shaped bracket 6a. .

  Subsequently, a clamp 9 c provided at the other end of the fastening band 9 is attached to the pedestal 2. Here, in a state where the lock clamp member 9q is opened with respect to the base clamp member 9p of the clamp 9c, the elastic band 9a is stretched, and the upper end portion of the base clamp member 9p is the lower end of the hinge 6 as shown in FIG. When the lock clamp member 9q is closed while being applied to the outer periphery of the pedestal 2 so as to be in contact with the portion, the lock clamp member 9q and the base clamp member 9p are configured to grip the pedestal 2 and above the pedestal 2 It is held in that position without moving to.

  Thereby, as shown in FIGS. 1 to 3, the mounting of the cushion member 7 having a circular arc shape on the top plate 4 of one of the ladder frames 5 is completed.

  When the worker tries to work while standing on the top plate 4 formed in a flat plate shape, the cushion member 7 is stepped on the feet of the worker and crushed as shown in FIG. The stopper portion 8b prevents expansion in the radial direction and does not become completely flat, so that the operator's feet become unstable and become unstable.

  Further, when the operator sits on the top plate 4 formed in a flat plate shape, the cushion member 7 is laid on the buttocks of the operator and crushed as shown in FIG. The stopper portion 8b prevents the spread in the radial direction and does not become completely flat, so that the operator's body is tilted from the waist and is still unstable.

  As a result, compared with the conventional stepladder, the worker can work while standing on the top plate 4 formed in a wide flat plate shape, or can sit on the top plate 4 so as to straddle the top of the stepladder 1. Therefore, the operator will not lose balance and fall off the top plate 4.

  Incidentally, since the cushion member 7 is attached only on the top plate 4 of one ladder frame 5, it does not interfere with the operation of the hinge 6, and for example, the two top plates 4 are temporarily covered with one flexible resin sheet. As in the case where the hinges 6 of the two top plates 4 are rotated, the cushion member 7 is not stretched and bent so as to follow a change in which the distance between the hinges 6 is rotated. There is no hindrance to opening and closing.

  Alternatively, the stepladder 1 can be used as a scaffold by placing a plurality of the stepladders 1 side by side and placing a scaffolding plate (not shown) between the top plates 4 of the stepladders 1 arranged side by side. However, if the clamp 9c of the fastening band 9 is opened and removed from the pedestal 2 and the hook 9b is pulled out from the opening 6b of the bracket 6a of the hinge 6, the cushion member 7 can be easily removed from the top plate 4. Therefore, there is no fear that the workability when the scaffolding plate is placed between the top plates 4 of the stepladder 1 arranged in parallel is hindered. In a large-scale construction site, there are many scenes where one company is in charge of each foreman's unit and a plurality of companies gather together for construction, and each company often brings a stepladder 1 according to its own process. The construction management may be another company, but the construction management company lends the cushion member 7, the groove-type pedestal 8 and the fastening band 9 as a set, and when the construction on that day is completed Management of collection is also easy.

  Thus, it is difficult for the operator to stand or sit on the top plate 4 during use, and the operator can be prevented from falling from the top plate 4.

  FIG. 7 shows a second embodiment of the stepladder according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 6 denote the same components, and the basic configuration is shown in FIGS. However, the second embodiment is characterized in that the cushion member 7 fitted on the grooved base 8 is placed on the top of one ladder frame 5 as shown in FIG. It is in that it is fixed on the plate 4 with a hook-and-loop or adhesive tape 10.

  If configured as in the second embodiment, the stepladder 1 does not have the bracket 6a (see FIG. 1) protruding above the hinge 6, and the hook 9b of the fastening band 9 in the first embodiment cannot be used. In this case, the cushion member 7 can be fixed with the tape 10, and the worker can stand on the top plate 4 formed in a wide flat plate shape or work on the stepladder 1 as compared with the conventional stepladder. Therefore, it is possible to avoid sitting on the top plate 4 so as to straddle the top of the top plate 4 so that the operator does not lose balance and fall off the top plate 4.

  Thus, in the second embodiment, as in the first embodiment, it is difficult for the worker to stand on the top plate 4 or sit down during use, and the worker can be prevented from dropping from the top plate 4.

  It should be noted that the stepladder of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Stepladder 2 Pillar 3 Foot 4 Top plate 5 Ladder frame 6 Hinge 6a Bracket 6b Opening part 7 Cushion member 8 Groove type base 8a Bottom plate part 8b Stopper part 9 Fastening band 9a Elastic band 9b Hook 9c Clamp

Claims (4)

There are two ladder frames, each of which has a plurality of pedestals between two pedestals and a top plate attached to the upper end between the pedestals. The upper ends of the two pedestal columns are pivoted by hinges. In the stepladder you wore,
A stepladder characterized in that a cushion member having a circular arc cross section is mounted on the top plate of one of the two ladder frames so that the outer peripheral surface faces upward.   The cushion member has a bottom plate portion placed on the top plate and a groove-type pedestal provided with a stopper portion that rises from both edges of the bottom plate portion and prevents the cushion member from expanding in the radial direction. The stepladder according to claim 1, wherein the stepladder is fitted and attached to the top plate together with the grooved base.   In the stepladder, the hinge has an eye-shaped bracket that protrudes upward when the stepladder is used, and the groove-type pedestal is hooked on the bracket at one end and uses a step between the hinge and the pedestal at the other end. The stepladder according to claim 2, wherein the stepladder is detachably attached to the top plate by a fastening band attached to the pedestal.   The fastening band includes a stretchable elastic band that presses the groove-type pedestal with the cushion member fitted thereto against the top plate with a force to shrink the pedestal toward the pedestal, and an elastic band provided at one end of the elastic band and above the hinge The stepladder according to claim 3, further comprising: a hook that is hooked to a bracket that projects to the outside, and a clamp that is provided at the other end of the elastic band and is attached to the pedestal.

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