JP4038424B2 - Workbench with handrail - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work table with a handrail used for construction work sites, interior / exterior work such as ceilings and wall surfaces of buildings, and high work such as electrical wiring work.
[0002]
[Prior art]
As is well known in the art, a stepladder has been pivotally attached to the upper ends of a pair of ladder-like legs to which a plurality of steps, for example, are attached at appropriate intervals, as is well known, A tread is provided, and the pair of legs are opened and closed by rotating the pivoting portion, and at the same time, the tread is folded or opened for use or stored when not in use.
[0003]
The prior art is conventionally well known among those skilled in the art, and does not relate to a known literature invention.
[0004]
By the way, since the tread is provided at the top of the ladder located at the apex of the ladder-like legs located on the two sides of the triangle as described above, it can ensure only a small area that a person can stand. In addition, when standing on the tread, there is no clue such as a handrail, so you will be working in an unstable state, and there is a risk of falling off the tread, which may cause safety problems. there were.
[0005]
Therefore, for example, as shown in FIG. 6, the applicant previously proposed a stepladder provided with a fall prevention means as a work table as Japanese Patent Application No. 2001-262729. This is because a ladder frame 3 is formed by attaching a plurality of step bars 2 at appropriate intervals between a pair of column legs 1 with handrail columns 4 extended on the top, and a pair of the ladder frames 3 are opposed to each other and the upper ends are mutually connected. It is pivotally mounted, and the tread board unit 6 is foldably bridged between the ladder frames 3 at the upper position of the support leg 1 so as to prevent falling, and is directed to the outside of the ladder frame 3 at the upper part of the handrail support 4. The upper handrail frames 8 and 9 projecting in a substantially horizontal direction are attached.
[0006]
[Problems to be solved by the invention]
Since the upper handrail frames 8 and 9 are attached to the upper end of the handrail support column 4, the distance between the work floor of the tread board unit 6 and the upper handrail frames 8 and 9 may be 90 cm or more, for example. For this reason, although the handrail frames 8 and 9 are arranged in the upper part in the space between the handrail support columns 4 and 4, the space to be formed is never small, and there is still a possibility of falling from this space. In addition, the work floor of the tread board unit 6 may exceed 2 m, and in such a case, the risk of falling becomes large.
[0007]
By the way, the “Crash Protection Work Safety Standards” created by the Temporary Industrial Association, as a safety standard for handrails, “In the middle beam, the inner legal distance between the middle beam and the upper beam should not exceed 45 cm. If the distance between the work floor of the tread board unit 6 and the handrail frames 8 and 9 is 90 cm as described above, this safety standard cannot be satisfied.
[0008]
The object of the present invention is to eliminate the inconvenience of the conventional example, and even if a handrail frame is attached to the upper part of the handrail support column as a fall prevention means, it falls from the gap between the work floor of the treadle unit and the handrail frame. The object is to provide a work table with a handrail that can prevent this and improve safety.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, first, a ladder frame is formed by attaching a plurality of step bars at appropriate intervals between a pair of column legs each having a handrail column extending thereon, and a pair of the ladder frames is formed. At the work table where the upper ends are pivotably attached to each other and pivoted to each other so that the treadle unit can be folded between the ladder frames at the upper position of the column legs, at least one of the pair of ladder frames is mounted on the upper end of the handrail column. An upper handrail frame protruding in a substantially horizontal direction from the outside to the outside is attached to be foldable, and is positioned below the main body of the upper handrail frame so as to protrude outward in a substantially horizontal direction between the tread plate unit. The gist is that a lower handrail frame serving as an intermediate rail is foldably attached.
[0010]
Second, the upper handrail frame has a stay whose base end is pivotably pivoted up and down in the middle of the handrail strut, and a U-shaped opening end portion of the handrail strut. The gist of the present invention is that it comprises a handrail frame body that is detachably locked to the upper end.
[0011]
Thirdly, the lower handrail frame is combined with a lower handrail frame main body whose U-shaped open end is detachably locked in the middle of the handrail post, and the lower handrail frame main body is combined with the lower end of the lower handrail frame main body so that the base end is rotatable. The gist of the present invention is that it is composed of a stay pivotally attached to the lower part of the handrail support so as to be pivotable up and down .
[0012]
According to the first aspect of the present invention, since the lower handrail frame is attached between the upper handrail frame and the tread board unit, it falls from the space formed between the upper handrail frame and the tread board unit. Can be prevented.
[0013]
According to the second aspect of the present invention, in addition to the above-described function, the upper handrail frame is pivotally mounted in the middle of the handrail support so that the base end of the stay can be pivoted up and down. The upper handrail frame body that is pivotably combined with the tip of the stay pivots so as to be positioned at the lower portion of the handrail post. . Therefore, at this position, the entire upper handrail frame is located at a lower portion of the handrail post and is removed from the opening between the handrail posts. Thereby, when a crossing board is combined between a plurality of stepladders, the handrail frame does not get in the way when the stepladder and the crossing board come and go.
[0014]
According to the third aspect of the present invention, the lower handrail frame main body can be removed by removing the lower handrail frame main body from the handrail post and rotating the stay around the pivoting portion with the handrail post. And the entire stay moves downward and is removed from the opening between the handrail posts. Thereby, when a crossing board is combined between a plurality of work tables, the handrail frame does not get in the way when the work table and the crossing board come and go.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall perspective view showing an embodiment of a workbench with a handrail according to the present invention. The basic structure of the workbench is basically the same as the conventional example shown in FIG. The same components as those in FIG.
[0016]
The stepladder 5 as a workbench with a handrail of the present invention also has, as a basic structure, a pair of ladder frames 3, a step board unit 6 that is foldable between the ladder frames 3, and an upper portion of the pair of ladder frames 3. The upper handrail frames 8 and 9 are foldably attached.
[0017]
The ladder frame 3 spans a plurality of (seven in the illustrated example) traversing bridges 2 at appropriate intervals (in the illustrated example, approximately 300 mm in the height direction) between the pair of support legs 1 and 1. The handrail support 4 is extended upward from the upper end of the support leg 1, and both the support leg 1 and the handrail support 4 are made of, for example, an aluminum alloy and formed in a U-shaped cross section.
[0018]
In this embodiment, the support leg 1 is divided into an upper main leg 1a and a lower main leg 1b, and a lower end of the upper main leg 1a and an upper end of the lower main leg 1b are connected to each other by a connecting bracket 10 so as to be rotatable. 1b was combined so as to be rotatable upward with respect to the upper main leg 1a.
[0019]
Then, the length of the traverse 2 is set to be shorter as the lower main leg 1b becomes the upper one, and is formed so that the interval between the support legs 1 and 1 becomes narrower as it goes upward.
[0020]
The tread board unit 6 is rotatably mounted between the opposing support legs 1 and 1 at the upper end of the support legs 1. The tread board unit 6 includes a tread board 6a and a stay 6b that supports the tread board 6a from below, and the stay 6b is pivotally attached at one end to a substantially central position below the tread board 6a, and the other end. The upper end of the support leg 1 or the lower end of the handrail support 4 or the boundary between the support leg 1 and the handrail support 4 is pivotally attached by a mounting bracket.
[0021]
The tread board 6a is pivotally pivoted at the end where the stay 6b is not overlapped to the upper end of the support leg 1 or the lower end of the handrail support 4 or the boundary between the support leg 1 and the handrail support 4 with a mounting bracket. To wear.
[0022]
The upper end portions of the handrail support columns 4 and 4 are brought into contact with each other, and are coupled by a rectangular rotating metal fitting 11 so as to be rotatable. In the figure, reference numeral 14 denotes an extension leg attached to the lower part of the support leg 1 so as to be freely extendable.
[0023]
As shown in FIG. 1, the upper handrail frames 8 and 9 attached to the handrail support 4 at the upper part of the ladder frame 3 include a stay 13 whose base end is pivotably mounted in the middle of the handrail support 4, and the stay 13. The upper handrail frame body 12 is composed of an aluminum alloy or the like, and the upper handrail frame body 12 is a hollow cylinder. The mold material formed in the above was formed into a planar U-shape.
[0024]
The specific structures of the upper handrail frame body 12 and the stay 13 are those described in Japanese Patent Application No. 2001-262729, and detailed description thereof is omitted here.
[0025]
In addition to such a configuration, the present invention is positioned between the upper handrail frame main body 12 and the tread plate 6a of the upper handrail frames 8 and 9, and is a lower handrail frame serving as a middle rail that protrudes outward in a substantially horizontal direction. Attach 15 to be foldable. Similarly to the upper handrail frames 8 and 9, the lower handrail frame 15 is composed of a combination of a U-shaped lower handrail frame main body 16 and a stay 17, and the opening end of the lower handrail frame main body 16 is locked with a hook or the like. The stay 17 was removably locked to the handrail support column 4 via the means, and the stay 17 was pivotally attached to the lower handrail frame main body 16 at its upper end and pivotally attached to the lower end of the handrail support column 4 at its lower end.
[0026]
The upper handrail frames 8 and 9 and the lower handrail frame 15 may be attached to only one side of the handrail support column 4 as shown in FIG. 1, or may be attached to both sides as shown in FIG. Further, as shown in FIG. 3, the upper handrail frames 8 and 9 can be attached to both sides, and the lower handrail frame 15 can be attached to only one side.
[0027]
Next, the usage will be described. FIG. 4 shows a stowed state in which the stepladder 5 is folded. In this state, the lower main leg 1b is folded upward through the connecting bracket 10 and overlaps with the upper main leg 1a and the handrail support column 4. Further, the tread unit 6 has a stay 6b and a tread plate 6a that are connected to each other so that the stay 6b and the tread plate 6a are moved upwards with respect to the pivoted portion of the ladder frame 3, respectively. It rotates and is folded between the opposing ladder frames 3 in parallel therewith.
[0028]
As for the upper handrail frames 8 and 9, the upper handrail frame main body 12 that is pivotally connected to the stay 13 is moved downward by rotating the stay 13 downward about the pivot shaft attachment portion with the handrail support column 4. To turn. Thereby, the stay 13 and the upper handrail frame main body 12 are accommodated inside the handrail support column 4 in a state of being folded in parallel. In this state, the tread plate 6a fits inside the upper handrail frames 8 and 9. Furthermore, fit the lower handrail frame 15 is also open end of the lower handrail frame body 16 is removed from the handrail supports 4 are folded parallel lower handrail frame body 16 and the stay 17 on the inner side of the handrail posts 4.
[0029]
In order to carry the stepladder 5 into the use site and use it in a state of being folded flat and short in this way, the lower main leg 1b is rotated downward via the connecting bracket 10 and the upper main legs 1a and 1 As a book, the pair of ladder frames 3 and 3 are opened in a square shape around the upper rotating metal fitting 11 as an axis. In this state, in the tread unit 6, the tread plate 6a and the stay 6b are in a horizontal state in conjunction with the opening of the stepladder 5.
[0030]
In this state, the upper handrail frames 8 and 9 are still folded inside the handrail support column 4 in parallel therewith. In order to set the upper handrail frames 8 and 9 horizontally, the step rail 2 is raised, standing on the footboard 6a, and the upper handrail frame body 12 hanging downward is pulled up. As a result, the stay 13 rotates around the pivot shaft attachment portion with the handrail support column 4, and the stay 13 is pulled up while rotating upward. Therefore, the rotation shaft between the stay 13 and the upper handrail frame body 12 is rotated. If the landing part is pulled up to a position substantially horizontal with the upper end of the handrail support column 4, a notch formed at the front end of the upper handrail frame main body 12 with a locking pin protruding from the upper end of the handrail support column 4 The upper handrail frame main body 12 is locked to the handrail support column 4 by being inserted from below into the handrail.
[0031]
For even lower handrail frame 15, raising the lower handrail frame body 16 and the stay 17 may be fixed to the open end of the lower handrail frame body 16 to the handrail posts 4.
[0032]
Since both the upper handrail frames 8 and 9 and the lower handrail frame 15 are opened on both sides of the handrail support column 4 by the same operation, the work is performed on the tread 6a in this state. In this state, since the upper handrail frames 8 and 9 and the lower handrail frame 15 exist in the space formed between the handrail support columns 4 and 4 as described above, the space between the step board 6a and the upper handrail frames 8 and 9 is present. Even if the interval is 90 cm or more, for example, there is no possibility of falling from this gap.
[0033]
It is also possible to use a work board by spanning a plurality of crossing plates between at least a pair of stepladders 5. In this case, the upper handrail frames 8, 9 and the lower handrail frame 15 are attached to both sides. Only one of them, for example, one upper handrail frame 9 is opened, the other upper handrail frame 9 is kept in the stowed state, and the lower handrail frame 15 on the side of the upper handrail frame 9 in the stowed state is also put in the stowed state. Then, the cross board may be connected to the tread board 6a.
[0034]
【The invention's effect】
As described above, the workbench-equipped workbench according to the present invention can prevent falling from the gap between the work floor of the tread board unit and the handrail frame when the handrail frame is provided as a fall prevention means. In addition, it is easy to use without restricting the installation direction of the stepladder at the work site. Also, when using a span plate between multiple stepladders as a work table, the stepladder and the span plate The handrail frame does not get in the way when coming and going, and there is no risk of hindering work.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a first embodiment of a workbench with a handrail according to the present invention.
FIG. 2 is a perspective view of an essential part showing a second embodiment of a handrail workbench according to the present invention.
FIG. 3 is a side view showing a third embodiment of the handrail workbench according to the present invention.
FIG. 4 is a side view showing a folded working table with a handrail according to the present invention.
FIG. 5 is a side view of a main part of the workbench with a handrail according to the present invention.
FIG. 6 is an overall perspective view of a conventional handrail with a handrail.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Post leg 2 ... Step rail 1a ... Upper main leg 1b ... Lower main leg 3 ... Ladder frame 4 ... Handrail support 5 ... Stepladder 6 ... Tread board unit 6a ... Tread board 6b ... Stay 8 ... Upper handrail frame 9 ... Upper handrail frame
10 ... Connecting bracket 11 ... Rotating bracket
12… Upper handrail frame body
13 ... stay
14 ... Extension leg 15 ... Lower handrail frame
16 ... Lower handrail frame body 17 ... Stay

Claims (3)

  A plurality of steps are attached at appropriate intervals between a pair of strut legs with handrail struts extended on the top to form a ladder frame, and a pair of the ladder frames are opposed to each other, and the upper ends are pivotably attached to each other. The upper handrail that protrudes in a substantially horizontal direction outward from at least one of the pair of ladder frames at the upper end of the handrail support column in a workbench that folds the tread unit between the ladder frames at the upper position of the support legs. The frame was foldably attached, and the lower handrail frame serving as a middle rail protruding in the substantially horizontal direction toward the outside between the treadle unit and the lower handrail frame was foldably attached. A workbench with a handrail characterized by.   The upper handrail frame is combined with a stay whose base end pivots vertically in the middle of the handrail post and a stay that is pivotally attached to the tip of the stay, and the U-shaped opening end is detachable from the upper end of the handrail post. The workbench-equipped workbench according to claim 1, comprising a handrail frame main body that is locked to the handrail. The lower handrail frame is composed of a lower handrail frame main body whose U-shaped opening end is detachably locked in the middle of the handrail post, and the lower handrail frame main body is combined with the lower end of the handrail frame so that the base end is the lower part of the handrail post. The workbench-equipped workbench according to claim 1, wherein the workbench is provided with a stay pivotally attached to the upper and lower parts.

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