JPS6152494A - Stepladder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a foldable stepladder.

[Conventional technology]

A leg body is formed by constructing a plurality of horizontal beams at equal intervals between a pair of columns, and the pair of legs are opposed to each other, and the upper part of the column is rotatably connected to the upper part of the column of the other leg body. Stepladders have existed for a long time.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional stepladder, the pair of legs are folded close to each other when stored when not in use, so the stepladder is flat in the folded state and in the state, and a large space is secured for storage. There is an inconvenience in having to do so.

Therefore, the technical object of the present invention is to solve the above-mentioned disadvantages and to create a stepladder that can be folded into an extremely small size.

[Means for solving problems]

In order to solve the above problems, the present invention constructs a plurality of horizontal bars that can be folded in half at equal intervals between a pair of columns, and connects the central bent part of each horizontal column between the pair of columns. The legs are formed by connecting to connecting rods placed parallel to the pillars.
A pair of legs is arranged five-point oppositely, the upper part of the support is rotatably connected to the upper part of the support of the other leg, and a groove is provided with a limiting mechanism to limit the opening angle of the pair of legs. It is.

[Effect]

In the stepladder having the above configuration, after releasing the restriction mechanism that limits the opening angle of the pair of stepladders, the stepladder can be folded into a flat plate shape by bringing the pair of legs close to each other.

Next, when the connecting rods of the legs are pulled up, each of the horizontal bars is bent from the center and the pair of supports on both sides move toward each other, and when the horizontal bars are completely folded in half, the pair of horizontal bars are bent. The pillars collide with each other and the four pillars come together, allowing the stepladder to be folded into a small prismatic shape.

〔Example〕

As shown in FIG. 1, the stepladder according to the present invention includes a pair of legs 1.1 and a tread plate 20 supported between the upper parts of the legs 1.1.
It consists of a combination of

The leg body 1 is provided with a pair of columns 2.2 on both sides, and a horizontal bar storage groove 3 extending in the length direction of the columns 2 is formed on the opposing surfaces of the columns 2.

Moreover, a plurality of horizontal bars 4 which can be folded in half in the length direction are installed at equal intervals between the pair of columns 2.2, and both ends located in the horizontal bar storage groove 3 are attached to the columns 2 by pins 5. Rotatably connected.

Further, a connecting rod 6 is disposed between the pair of supports 2 in parallel to the supports 2, and the connecting rod 6 is inserted into a rod insertion hole 7 formed in the central bent edge of the horizontal beam 4, and the connecting rod 6 is inserted into a rod insertion hole 7 formed in the central bent edge of the horizontal beam 4. 8 connects the rod 6 and the bent portion of the horizontal beam 4.

As shown in FIG. 6, a cylindrical body 9 is fitted onto the outside of the connecting rod 6, and a pin 8 that fixes the cylindrical body 9 to the connecting rod 6 connects the cylindrical body and the bent portion of the horizontal bar 4. By connecting them, the peripheral edge of the rod insertion hole 7 can be supported by the upper edge of the cylindrical body 9, so that the leg body 1 with excellent stability can be obtained.

As shown in FIGS. 2 and 7, a support 11 is slidably fitted to the lower part of the connecting rod 6, and the support 11 is fixed to the lower part 1 of the pair of columns 2. The block 12 is connected to the block 12 by a pair of stays 13.13, and when the pair of supports 2 are moved apart to extend each horizontal bar 4 in a straight line, the center part of the lowest horizontal bar 4 is connected to the above-mentioned support. It is supported by the body 11, and each horizontal beam 4 is held in a straight (extended) state.

A pair of H-bodies with the above configuration], 1 are arranged so as to face each other, and the upper part of the pillar 2 is placed above the other leg 1. S is rotatably supported by a support pin 14. The columns 2 of the pair of chests 1.1 are connected and connected by links 15 that can be folded into two, and when the pair of legs 1 is opened, the links 15 extend linearly and the legs 1. The angle of the number of legs 1 is limited so that it does not open any further.

The step board 2o is placed on the uppermost horizontal beam 4 of the pair of legs 1. As shown in FIG. 6, this footboard 20 is made up of three plate bodies 21, 22, and 23 connected by pins 24 so that they can be folded into three parts. Guide groove 2 into which the upper part of the connecting rod 6 of the body 1 can be inserted
5 is provided, and the center portions of both side surfaces of the guide groove 25 and the upper part of the connecting rod 6 of the one leg 1 are connected by an arm 26 (see FIG. 4). An engagement hole 27 is formed in the center of this arm 26, and the upper part of the other connecting rod 6 can be fitted into the engagement hole 27 when the pair of legs 1.1 are folded close to each other. ing.

Now, when the pair of supports 2 of each leg body 1.1 are moved in the direction of separation, each horizontal bar 4 is extended, and by extending the horizontal bar 4 in a straight line, the horizontal bar 4 of the lowest level is extended.

is supported by a support body 11, and the pair of legs 1 is held in an expanded state. Then, the pair of legs 1 is rotated around the support bin 14 to open it, and the link 15 provided between the sides of the legs 1 is extended linearly, and the link 15 is placed on the second horizontal bar 4. Treadboard 20
By spanning the steps, the stepladder can be assembled as shown in FIG.

In addition, the central part of the link 15 that spans between the sides of the legs 1 is pushed up to move the pair of legs I in the direction of approaching each other so that they overlap each other as shown by the chain lines in FIG. When the connecting rod 6 of the body 1 is pulled up, each of the horizontal bars 4 is folded in half, as shown by the chain line in FIG. bi-fold horizontal beam 4
are mated.

In the state where the supports 2 of the leg body 1 are assembled, the chain in Fig. 4,
As shown by the lines, the connecting rod 6 of one leg 1 and the footboard 20
The other 111 body 1 is inserted into the engagement hole 27 of the arm 26 connecting the
By fitting the upper part of the connecting rod 6 of each column 2
are held in a state of gathering.

Then, rotate the treadboard 20 around the joint between the arm 26 and the treadboard 20, stand the treadboard 20 upright as shown by the chain line in FIG. By rotating the connecting portion to the plate body 22 about the center Q and superimposing it on the side of each leg body 1, a folded state as shown in FIG. 8 can be obtained.

In addition, in the case of the Example, although the stepladder which provided the step board 20 on the uppermost horizontal crosspiece 4 was shown, the step board 20 may be omitted.

In addition, in the case of the embodiment, when the stepladder is in the unfolded state, the lowermost horizontal bar is supported by a support slidably fitted to the lower part of the connecting rod to prevent the connecting rod from moving downward. However, by regulating the length of the connecting rod so that the lower end of the connecting rod is supported on the floor surface when the legs are in the unfolded state, the support body can be omitted.

〔effect〕

As described above, this invention (according to this invention) can be achieved by overlapping a pair of legs into a flat plate shape, pulling up the connecting rod, and folding the horizontal beam installed between the pair of supports into two. A small and compact folded state is obtained in which each support column is assembled, and it does not take up much space to store when not in use, making it convenient to carry.

In addition, by installing a tread on the top horizontal rail, it is possible to obtain a stable working posture, and the tread and one side! An engagement hole is provided in the arm that connects the connecting rods of the # bodies, and by fitting the upper part of the connecting rod of the other side into the retaining hole, the pair of legs are held in a folded state where they overlap each other. Therefore, a stable folded state can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of a stepladder according to the present invention, FIG. 2 is a front view of the same, FIG. 3 is a side view of the same, and FIG.
The figure is an enlarged sectional view of the tread support portion of the same as above, FIG. 5 is a sectional view taken along line V-V of FIG. 4, FIG. 6 is an exploded perspective view of the tread support portion of the same as above, and FIG. 7 8 is an exploded perspective view of a part of the lowermost horizontal beam and a support supporting the same, and FIG. 8 is a perspective view showing the same in a folded state. 1... Leg body, 2. Support, 4 Horizontal beam, 6... Connecting rod, 20... Treadboard, 26... Arm, 27... Engagement hole 2 Figure 3

Claims (1)

[Scope of Claims] 1. A plurality of horizontal bars that can be folded in half are installed at equal intervals between a pair of supports, and the central bending part of each of the horizontal bars is connected to a connecting rod placed between the pair of supports. A pair of legs are formed by forming legs, a pair of the legs are opposed to each other, the upper part of the support is rotatably connected to the upper part of the support of the other leg, and a restriction mechanism is provided to limit the opening angle of the pair of legs. A stepladder. 2. A plurality of horizontal bars that can be folded in half are installed at equal intervals between a pair of columns, and the central bent part of each horizontal bar is connected to a connecting rod placed between a pair of columns to form a leg body. , the pair of legs are arranged opposite to each other, the upper part of the support is rotatably connected to the upper part of the support of the other leg, and a restriction mechanism is provided to limit the opening angle of the pair of legs, and the upper part of the connecting rod is protrudes from the top horizontal bar, and connects the upper part of one of the connecting rods with the center part of the bottom surface of the tread placed on the top horizontal bar by an arm.
The stepladder is provided with an engagement hole in the middle of the arm into which the upper part of the other connecting rod can be fitted when the pair of legs are folded close to each other. 3. The stepladder according to claim 2, wherein the stepboard can be folded into three in the direction of the pair of support columns.