KR20210120667A - Ladder device - Google Patents

Abstract

The present invention provides a ladder apparatus. In the ladder apparatus of the present invention, a link means is installed between front and rear legs constituting a step-type footrest, so that an operation that the front and rear legs are unfolded outward or folded inward can be performed. A hinge device is installed at a joint portion of each link means to be able to induce stable unfolding and folding of the front and rear legs. Of course, it is possible to maintain a stable fixed state without shaking during the unfolding operation. The ladder apparatus of the present invention comprises: a work platform (10); the front leg (20); the rear leg (30); a first connection frame (42); a second connection frame (44); a center hinge device (200); a vertical bar (46); a shaft pin (90); and the link means (40).

Description

Ladder device

The present invention relates to a ladder device, and more particularly, to a ladder device in which folding and unfolding operations of the front and rear legs can be stably made through a link means installed between the front and rear legs.

In general, when work in high places is required, for example, in various work sites where work such as communication work, woodwork, painting, plastering, electricity, painting, film, tile, etc. I'm on the platform so I can get to work.

On the other hand, as a representative prior art related to such a step-type work scaffold, the Korean Patent Office Laid-Open Utility Model Publication No. 20-2014-0002358 (name: step step scaffolding device for work) can be given as an example.

In the prior art, in the stepped scaffolding device that an operator can climb up and down, a stationary frame disposed on both sides at a distance, and a scaffold fixed to the stationary frame in a structure arranged with a step between the both sides of the fixing frame, and the fixing A first guide pipe having a hollow structure formed on one side of the frame, a scaffolding means comprising a fastening fastener fastened to the first guide pipe, and the unit structure and The gist is that it is configured to include a pressure coupling means that is separably fixed, and a handle means that is coupled to the pressure coupling means so as to move up and down.

However, as the step scaffolding device having the same structure as in the prior art is used in a fixed state rather than a folded or stacked structure, the volume cannot be reduced when storing the scaffold device after work, so space necessary for storage is secured. has the disadvantage of being limited.

Document 1: Korean Intellectual Property Office Publication No. 20-2014-0002358

In order to solve the problems of the prior art, the present invention provides a ladder device capable of performing an operation of unfolding the front and rear legs outward or folding inward by installing a link means between the front and rear legs constituting the step-type footrest.

Provided is a ladder device capable of inducing stable unfolding and folding of the front and rear legs by installing a hinge device at the joint portion of each link means.

The present invention is a ladder device capable of unfolding and folding, a front leg consisting of a working scaffold, a pair of vertical frames supporting the working scaffold, and a scaffold installed between the vertical frames, located behind the front leg and said A rear leg consisting of a pair of vertical frames supporting the working scaffold and a scaffold installed between the vertical frames, a first connecting frame having one end connected to the vertical frame of the front leg by a first hinge device, and the vertical of the rear leg A second connecting frame having one end connected to the frame by a second hinge device, and connecting the first and second connecting frames with a hinge pin in a state located between the first and second connecting frames, and extending the front and rear legs and a center hinge device allowing the first and second connection frames to be unfolded or folded around the hinge pin according to a folding operation, and a long hole for passing the hinge pin of the center hinge device is formed, and the first and second connection frames are formed. A vertical bar positioned vertically between the connection frames to be movable up and down, a shaft pin coupled to the tip of the vertical bar, and a front and rear side with the shaft pin interposed therebetween, the other end of which is buttted to each other. A first that is connected to the outer diameter of the shaft pin in a state of being, one end of which is pin-coupled to the vertical frame of the front and rear legs, respectively, and is folded around the shaft pin according to the lifting operation of the shaft pin according to the lifting operation of the vertical bar , Ladder device, characterized in that it comprises a link means composed of two guide frames.

According to the present invention, by installing a link means between the front and rear legs, the front and rear leg members can be unfolded outwardly or folded inwardly, and a hinge device is installed at the joint portion of each link means to provide the front and rear legs. Provided is a ladder device that can induce stable unfolding and folding of the legs, as well as maintaining a stable fixed state without being shaken during the unfolding operation.

1 is a view showing the configuration of the ladder device three-dimensionally.
Figure 2 is an exploded view showing the configuration of the ladder device of Figure 1;
Figure 3 is an exploded view showing the first hinge device extracted from the ladder device of Figure 1.
4 to 8 are views sequentially illustrating the operating state of the first hinge device.
Figure 9 is a view showing a state in which the ladder device in Figure 1 is folded into one stage.
Figure 10 is a view showing a fully folded state of the ladder device of Figure 9.

Figure 1 is a three-dimensional view showing the configuration of the ladder device, Figure 2 is a diagram showing the disassembled configuration of the ladder device of Figure 1.

As shown in Figures 1 and 2, the work platform 10 is a plate type of flat plate so that workers can perform work such as woodworking, painting, plastering, electricity, painting, film, tile, etc. do. The working platform 10 rotates in the forward and reverse directions with the hinge as a starting point in a state in which it is hinged to the upper surface of the vertical frame 32 of the rear leg 30 and is placed on the upper surface of the front and rear legs 20 and 30 When losing or storing, it should be closely attached to the rear leg (30).

The front leg 20 is composed of a pair of vertical frames 22 supporting the lower front of the working scaffold 10 and a scaffold 24 installed between the vertical frame 22 .

The rear leg 30 has the same shape as the front leg 20, and the lower back of the working platform 10 is connected to a pair of vertical frames 32, spaced apart from each other by a predetermined distance between the vertical frames 32. It is composed of at least one or more scaffolding frame (34).

The link means 40 connects the front leg 20 and the rear leg 30 to each other, and the front and rear legs 20 and 30 are spread outward using the link means 40 as a guide, or It reduces the volume of the ladder device by guiding it to be folded inward, and at the same time, when in use, firmly fix the lower and rear legs (20, 30) in an unfolded state.

A plurality of such link means 40 are arranged in the same structure on both sides of the front leg 20 and the rear leg 30, and the structure of one link means will be described below.

The link means 40 includes first and second connecting frames 42 and 44, vertical bars 46, first and second guide frames 92 and 98, and first and second hinge devices 50 and 90, and a center hinge. The device 200 is included and configured.

The first hinge device 50 is a device configured to rotatably connect the first connecting frame 42 and the vertical frame 22 of the front leg 20 as shown in FIG. 3 .

The first hinge device 50 includes a pair of second frames 56 coupled to the vertical frame 22 of the front leg 20 , and a pair of first frames coupled to the first connection frame 42 . It is composed of a frame 52, and first and second hinge frames 54 and 58 which are buttted to each other and overlapped are provided integrally with the front end of the first frame 52 and the front end of the second frame 56, respectively. do.

A rotating plate 60 is internally installed between the first and second hinge frames 54 and 58 , and a shaft 80 is provided at the center of the first and second hinge frames 54 and 58 , and the rotating plate 60 . It is installed through, and the first and second hinge frames 54 and 58 and the rotating plate 60 rotate around the shaft 80 .

A pressing lever 72 is installed through the outside of the second frame 56 , a locking block 76 is installed at an end of the pressing lever 72 , and the pressing lever 72 has an outer diameter of the pressing lever 72 . A spring 74 for elastically supporting the pressing operation of the lever 72 is installed.

An inclined surface portion 78 is formed on the bottom surface of the locking block 76, and the inclined surface portion 78 is provided with the locking block 76 in the first and second locking grooves 64 and 66 of the rotating plate 60. Without being caught, the first and second locking grooves 64 and 66 are guided so that they can ride and pass as needed, a description of which will be described in more detail below.

First and second fastening grooves 68 and 70 are respectively formed in the outer diameter of the first hinge frame 54 so that the lock block 76 can be selectively hung according to the pressing operation of the pressing lever 72, The first and second locking grooves 64 and 66 are respectively formed so that the locking block 76 can be selectively caught even on the outer diameter of the rotating plate 60 .

A return spring 62 is installed on the rotating plate 60 , and the return spring 62 elastically supports the rotation of the rotating plate 60 and returns to an initial state.

The configuration of the first hinge device 50 configured as described above will be described with reference to FIGS. 4 to 8 .

In the state in which the front leg 20 of the ladder device is unfolded, the locking block 76 has a first fastening groove 68 of the first hinge frame 54 and a first locking groove of the rotating plate 60 as shown in FIG. 64), and in this state, the rotation of the first hinge frame 56 and the rotating plate 60 is restrained to prevent the front leg 20 from being unintentionally folded.

Next, when the front leg 20 needs to be folded as shown in FIG. 5 , if the pressing lever 72 is pressed, the lock block 76 is formed with the first fastening groove 68 of the first hinge frame 54 and the rotating plate 60 ) comes out from the first locking groove 64 of the The rotating plate 60 returns to its initial state.

Next, as in FIG. 6 , when the pressing of the pressing lever 72 is released, the locking block 76 is in a state in close contact with the outer surface of the rotating plate 60, and then, when the locking block 76 comes out, the front leg 20 The vertical frame 22 is rotated without being constrained any more and is folded inward.

Next, as shown in FIG. 7 , the locking block 76 passes through the second locking groove 66 in the process of riding over the outer surface of the rotating plate 60 . At this time, the inclined surface formed at the lower end of one side of the locking block 76 . By the part 78, the locking block 76 is not caught in the second locking groove 66, but passes over the second locking groove 66.

Next, as in FIG. 8 , when the front leg 20 is pulled slightly in the opposite direction, that is, from the inside to the outside, the lock block 76 rotates while being caught in the second locking groove 66 of the rotary plate 60 . and the rotating plate 60 is rotated in the opposite direction, and then, when the second locking groove 66 of the rotating plate 60 and the second fastening groove 70 of the first hinge frame 54 are located on the same line, the lock The block 76 is caught in the second locking groove 66 of the rotating plate 60 and the second fastening groove 70 of the first hinge frame 54 by the tension force of the spring 74 and the front leg folded inward. (20) will be fixed again.

The second hinge device 150 is manufactured in the same configuration as the above-described first hinge device 50 and is connected and installed between the second connection frame 44 and the vertical frame 32 of the rear leg 30, the rear leg The hinge function is performed so that the inner folding and outer unfolding of the 30 are performed, and the detailed structure and operation of the second hinge device 150 is performed in the same manner as the above-mentioned first hinge device 50 . However, a description thereof will be omitted.

The center hinge device 200 is installed between the first and second connecting frames 42 and 44 to rotatably connect the first and second connecting frames 42 and 44 .

9 and 10 are views showing a process in which the ladder device is folded by the link means.

As shown, the first and second connection frames 42 and 44 are centered on the center hinge device 200 according to the operation of unfolding the front and rear legs 20 and 30 outward or tucking them inward. It rotates and performs the motion of lying down horizontally or standing up in an oblique direction.

The center hinge device 200 includes a first center frame 210 coupled to the other end of the first connection frame 42 , and the other end of the second connection frame 44 coupled to the first center frame 210 . It consists of a second center frame 220 coupled to the hinge pin 230 in a state superimposed on the .

In the center hinge device 200, when the front and rear legs 20 and 30 are spread outward, the first and second connection frames 40 and 42 lie horizontally, and the front and rear legs 20 and 30 are inside. When folded, the first and second connection frames 42 and 44 are erected in an oblique direction, and guides the operation to be possible at this time.

The vertical bar 46 is positioned vertically between the first and second connection frames 42 and 44, and a long hole 48 is formed through the lower end of the vertical bar 46, and the long hole ( 48), the hinge pin 230 of the center hinge device 200 installed between the first and second connection frames 42 and 44 is fitted.

The tip of the vertical bar 46 is coupled to and supported by the end of the shaft rod 90 installed between the first and second guide frames 92 and 98 .

The vertical bar 46 is an operation in which the front and rear legs 20 and 30 are completely folded inward, and when the first and second connection frames 42 and 44 are erected at an angle close to the vertical, The hinge pin 230 collides with the long hole 52 and pushes the vertical frame 46 upward.

With the shaft pin 90 coupled to the front end of the vertical bar 46 interposed therebetween, first and second guide frames 92 and 98 are mounted on the outer diameter of the shaft pin 90 in front and rear of the shaft pin 90. 96, 102) are connected.

One end of the first guide frame 92 is coupled with a pin 94 to the vertical frame 22 of the front leg 20, and the other end is connected to the outer diameter of the shaft rod 90 by a bracket 96, One end of the second guide frame 98 is coupled with a pin 100 to the vertical frame 32 of the rear leg 30 , and the other end thereof is connected to the outer diameter of the shaft rod 90 by a bracket 102 .

The first and second guide frames 92 and 98 stably guide the folding of the front and rear legs 20 and 30, that is, the front and rear legs 20 and 30 of the first step as shown in FIG. When folded, the first and second guide frames 92 and 98 maintain the unfolded state and support the front and rear legs 20 and 30. The folded is the angle when the ladder device needs to be moved to another place by pushing it, and if the ladder device is pushed in this state, the front and rear legs 20 and 30 can be easily moved to a desired position through the wheels at the bottom. In the process of movement, the first and second guide frames 92 and 98 are supported and guided in an unfolded state so that the front and rear legs 20 and 30 do not shake and the first step folding can be performed stably.

On the other hand, when the front and rear legs (20, 30) of the ladder device are completely folded to the inside, the first and second connection frames (42, 44) are erected at an angle close to the vertical as shown in FIG. 10, and together with the center hinge The hinge pin 230 of the device 200 raises the vertical bar 46 at the same time as it hits the upper surface of the long hole 48 . When the shaft rod 90 is lifted up by the lifting operation of the vertical bar 46, the first and second guide frames 92 and 98 are lifted together with the shaft rod 90 together with the bracket 96, 102) rotates about the respective pins 94 and 100 and lifts them together with the shaft rod 90, and then the first and second guide frames 92 and 98 are superimposed on each other in a completely vertical state. do. When the first and second guide frames 92 and 98 are superimposed on each other, it is possible to reduce the volume of the ladder device when storing the ladder device.

Ladder device having such a configuration is used to spread the front and rear legs (20, 30), or when moving, fold the front and rear legs (20, 30) in one step, and also when stored, the front and rear legs (20, 30) is folded and stored so that it is completely overlapped inward.

First, for the movement of the ladder device 200, the operation of folding the front and rear legs (20, 30) inward in one step is the front and rear legs (20, 30) and the first and second connection frames (42, 44) ) to first release the lock of the first and second hinge devices 50 and 150 connecting them.

That is, when the push button 72 of the first hinge device 50 is pressed as shown in FIGS. 4 to 8 , the lock lever 76 includes the first fastening groove 68 of the first hinge frame 54 and the rotating plate. (60) comes out of the first locking groove (64), and at the same time, the tension force of the return spring (62) is applied to rotate the rotating plate (60) so that the first fastening groove (68) is locked to the lock lever (76) to get out of

Next, when the pressing of the pressing lever 72 is released, the locking block 76 is in close contact with the outer surface of the rotating plate 60 according to the tension force of the spring 74 , and thereby the vertical frame of the front leg 20 . (22) is no longer constrained, rotates and folds inward.

Next, with the continuous folding operation of the front leg 20, the locking block 76 passes through the first locking groove 64 again in the process of riding over the outer surface of the rotating plate 60. At this time, the locking block 76 ) by the inclined surface portion 78 formed at the lower end of the one side, the lock block 76 is not caught in the first locking groove 64, but rides over the first locking groove 64.

Next, after the front leg 20 is completely folded, if the front leg 20 is pulled slightly in the opposite direction, that is, from the inside to the outside direction, the lock block 76 is the second locking groove of the rotating plate 60 ( 66) and rotates the rotating plate 60 in the opposite direction, and then the second engaging groove 70 of the rotating plate 60 and the second fastening groove 70 of the first hinge frame 54 When positioned on the same line, the locking block 76 is a second locking groove 70 of the rotating plate 60 and a second fastening groove 70 of the first hinge frame 54 by the tension force of the spring 74 . It is to be hung on the inside and to fix the front leg 20 folded inward again.

The second hinge device 150 connecting the rear leg 30 and the second connection frame 44 proceeds in the same manner as the first hinge device 50, and the front and rear legs 20 and 30 are completely moved inward. It can be folded to store the ladder device.

Meanwhile, according to the folding operation of the front and rear legs 20 and 30, the vertical bar 46 and the first and second guide frames 92 and 98 guide the folding operation of the front and rear legs 20 and 30. Preferably, when the front and rear legs 20 and 30 begin to fold, the hinge pins 230 of the center hinge device 200 that connect the first and second connection frames 42 and 44 in a butt-to-face state. ) rides up on the long hole 48 of the vertical bar 46 and guides the first-step inner folding of the front and rear legs 20 and 30.

At this time, the folding of the front and rear legs 20 and 30 in step 1 is not for the purpose of storing the ladder device, but is an angle folded to push the ladder device through the wheels 300 when moving, and at this angle, the vertical bar 46 does not elevate, and the first and second guide frames 92 and 98 also maintain an unfolded state.

And, when the work is completely finished and the ladder device needs to be folded, if the front and rear legs 20 and 30 are completely folded inward as shown in FIG. 10, the center connecting the first and second connecting frames 42 and 44 The hinge pin 230 of the hinge device 200 hits the upper surface of the long hole 48 and pushes up the vertical bar 46 with the long hole 48 upward, and thus is coupled to the tip of the vertical bar 46 . The shaft rod 90 is lifted upward, and at the same time, the first and second guide frames 92 and 98 are lifted together with the shaft rod 90 through the brackets 96 and 102) through the respective pins 94. , 100) and being lifted together with the shaft rod 90, the first and second guide frames 92 and 98 are superimposed on each other in a state of being completely erected vertically to minimize the volume when storing the ladder device. will reduce

10: work platform
20: front leg 22: vertical frame
30 rear leg 32: vertical frame
40: link means 42: first connection frame
44: second connection frame 46: vertical bar
48: long hole 50: first hinge device
52: first frame 54: first hinge frame
56: second frame 58: second hinge frame
60: rotary plate 62: return spring
64: first engaging groove 66: second engaging groove
68: first fastening groove 70: second fastening groove
90: shaft rod 92: first guide frame
98: second guide frame 200: center hinge device
210: first center frame 220: second center frame

Claims (1)

In the ladder device that can be unfolded and folded,
working platform (10);
a pair of vertical frames 22 supporting the working scaffold 10 and a front leg 20 composed of a scaffold 24 installed between the vertical frame 22;
A pair of vertical frames 32 positioned behind the front leg 20 and supporting the working scaffold 10 and a rear leg 30 composed of a scaffold 34 installed between the vertical frame 32. ;
a first connection frame 42 having one end connected to the vertical frame 22 of the front leg 20 by a first hinge device 50;
a second connection frame 44 having one end connected to the vertical frame 32 of the rear leg 30 by a second hinge device 150;
The first and second connection frames 42 and 44 are connected with a hinge pin 230 in a state located between the first and second connection frames 42 and 44, and the front and rear legs 20 and 30 are connected to each other. a center hinge device 200 for allowing the first and second connection frames 42 and 44 to be unfolded or folded around the hinge pin 230 according to the unfolding and folding operations of the ;
A long hole 48 is formed for the hinge pin 230 of the center hinge device 200 to pass through, and it is vertically erected between the first and second connection frames 42 and 44 so as to be movable up and down. Positioned vertical bar (46);
a shaft pin 90 coupled to the tip of the vertical bar 46;
The shaft pin 90 is positioned at the front and rear respectively, the other end is connected to the outer diameter of the shaft pin 90 in a butt-butted state, and one end of the vertical frame of the front and rear legs 20 and 30 The first and second guide frames 92 which are respectively pin-coupled to 22 and 32 and are folded around the shaft pin 90 according to the lifting operation of the shaft pin 90 according to the lifting operation of the vertical bar 46 . , 98) Ladder device, characterized in that it comprises a link means 40 consisting of.

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