JPH06248865A - Ceiling housing type ladder device - Google Patents

Abstract

PURPOSE:To secure speedy lifting performance and safety by laying out an upper part ladder, a middle part ladder and a lower part ladders each of which is in a working state on a straight line and eliminating the formation of an offset portion in a continuous bordering area in terms of a ceiling ladder device which forms a working state and a housing state with a motor drive means. CONSTITUTION:A cover 2 is single swing with a housing frame 1. An underframe 4 fixed with the top of the cover and the housing frame 1 are connected with an opening angle regulation lever 5 where an upper part ladder 7 is fixed with the underframe and a middle part ladder 8 is stacked on the top while a lower part ladder 9 is stacked on the top respectively, thereby connecting the underframe and the middle part ladder a parallel link which comprises a short link 10 and a long link 11. The lower part ladder is connected to the lower end of the middle part ladder with a hinge 14 while a free end of the long link and a folding link 13 are pivot-jointed at the same time. A rotary motor 15 is fixed with the inside of the upper part housing frame at the pivoting position of the cover. The tip of a belt 16 sent from each winding drum is spanned to a first rotator 17 and a second rotator 18 and fixed at the middle part of the short link.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling storage ladder device for opening and closing a lid and extending and shortening a ladder by electric drive means.

[0002]

2. Description of the Related Art A conventional ceiling storage ladder device of this type is disclosed in Japanese Patent Laid-Open Nos. 63-300195 and 1-15.
As disclosed in Japanese Patent Publication No. 4988 and the like, one end edge portion of the storage frame provided at the ceiling opening is pivotally attached to the lower edge of the storage frame so that the cover body can be opened, and the storage frame and the cover body are attached. And an upper ladder is fixed to the upper surface of the lid, an intermediate ladder is slidably stacked on the upper surface of the upper ladder, and a lower ladder is slidably stacked on the upper surface of the intermediate ladder. A flexible member such as a rope or a belt is laid over the lower ladder, the upper ladder, and the storage frame, and the flexible member is wound or unwound by an electric drive means to extend each staircase or to store it in a stacking state. There is known a device that does.

[0003]

The above-mentioned conventional ladder device for ceiling storage is provided with an intermediate ladder and a lower ladder, which slide on the upper ladder fixed to the lid by the tightening and tightening of the ropes. In particular, in use, a discontinuous step difference or a landing-like wide tread surface is formed at the continuous boundary portion between the upper ladder, the intermediate ladder and the lower ladder. Therefore, when the stairs are raised and lowered with the same rhythm, the rhythm is disturbed due to the discontinuous step difference or the wide foot plate portion, there is a risk of catching or stepping off the foot, and it is not possible to move up and down quickly and safely. There was a task to be done.

An object of the present invention is to provide a ceiling storage ladder device which forms a use state and a storage state by an electric drive means, and the upper ladder, the intermediate ladder and the lower ladder in the use state are arranged in a straight line. Thus, it is an object of the present invention to provide a ladder device for ceiling storage in which no step difference is formed at each continuous boundary portion and a quickness and safety of ascent and descent are ensured.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a lid is provided so as to be capable of being opened on one side of the lower surface of a storage frame provided in a ceiling opening. Along with pivoting one edge, an opening angle regulating means for the storage frame and the lid is provided, and an upper ladder is fixed to the upper surface of the lid, and an intermediate ladder and a lower ladder are attached to the upper surface of the upper ladder. Stacking, a flexible member such as a rope or a belt is stretched over any one of the lower ladder and the intermediate ladder, the upper ladder and the storage frame, and the flexible member is wound and unwound by an electric drive means. In this ladder device for ceiling storage, the upper ladder is fixed to the lid through the underframe, and the underframe and the intermediate ladder are formed on the upper side and the short link is formed on the lower side by the long link to form a parallel link mechanism. Also, at the lower end of the middle ladder, The lower ladder having links is connected by a hinge, and the free end of the long link and the bending link are pivotally connected, and the flexible member is extended from the housed state of each ladder to open the lid partly. And the parallel movement of the middle ladder by swiveling and lowering, and the opening of the lower ladder by the operation of the long link and the bending link as the fulcrum, thereby forming each ladder in a linearly extended state. By winding the flexible member from the extended state, the lower ladder and the intermediate ladder are operated in the opposite manner to the above operation so that the upper ladder and the upper ladder are overlapped with each other, and a ladder storage state is formed by closing the lid body. The gist is a ladder device for ceiling storage.

[0006]

According to the above construction, when the flexible member is extended, the middle ladder is rotated with respect to the upper ladder by the parallel link mechanism by the long and short links connecting the underframe and the middle ladder. The upper ladder, the middle ladder and the lower ladder form a straight line as they move parallel to each other and are located on the extension line of the lower end of the upper ladder, and the lower ladder opens around the hinge. A discontinuous step or a landing-like wide tread surface is not formed at the boundary. Therefore, the stairs can be moved up and down with the same rhythm, and the risk that the rhythm is distorted due to the discontinuous step difference or the wide tread plate portion and the foot is caught or stepped off unlike the conventional product is eliminated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the ladder device for ceiling storage according to the present invention will be described. FIG. 1 is a schematic side view showing a storage state of the ladder by breaking the storage frame, and FIG. The schematic side view and FIG. 3 are schematic side views in use, but only one side is shown, but both sides have the same configuration. The description will be given based on the above figures. The lid 2 is pivotally attached to the lower end of the storage frame 1 provided in the ceiling opening by a pivot shaft 3 so that the lid 2 can be opened, and the storage frame 1 and the lid 2 are connected to each other. As an opening angle regulation means, an underframe 4 fixed to the upper surface of the lid body 2 and the storage frame 1 are connected by an opening angle regulation lever 5 that bends, and the underframe 4 on the upper surface of the lid body 2 has a lower end portion. The upper ladder 7 is fixed while leaving the intermediate ladder supporting surface 6, and the upper ladder 7 is overlaid with the intermediate ladder 8 and the upper surface of the intermediate ladder 8 is overlaid with the lower ladder 9 to form the underframe 4. Intermediate link 8 and short link 10
And the long links 11 are used for the connection.
This connection is set so that when the intermediate ladder 8 is swung down, the upper end of the intermediate ladder 8 abuts the lower end surface of the upper ladder 7 while being supported by the intermediate ladder support surface 6. Is done. Further, at the lower end of the intermediate ladder 8, a support stand 12 and a lower ladder 9 having a bending link 13 are connected by a hinge 14, and the free end of the long link 11 and the bending link 13 are pivotally attached. Join. Then, a forward / reverse rotation motor 15 having winding drums on both sides is fixed to the inner surface of the storage frame 1 at the upper part of the lid 2 at the pivot position, and the tip of the belt 16 fed from each winding drum is fixed to the storage frame 1. It is a structure in which the first rotor 17 provided on the inner surface and a second rotor 18 provided at an upper position of the upper ladder 7 are bridged and fixed to an intermediate portion of the short link 10.

The ladder device having the above-described structure is provided with a switch (not shown) when changing from the housed state to the ladder installed state.
When the forward / reverse rotation motor 15 is driven by the operation in the direction in which the belt 16 is unwound from the winding drum, the lid body 2 that supports the upper, middle, and lower ladders 7, 8, and 9 moves in accordance with the unwinding of the belt 16. It rotates about the pivot shaft 3 by its own weight, and the opening angle regulating lever 5 is brought into a straight state. When the belt 16 is further unwound, the own weight of the intermediate ladder 8 acts on the center of gravity of the intermediate ladder 8 located to the right of the pivotal connection position between the underframe 4 and the intermediate ladder 8, and the intermediate ladder 8 moves toward the upper ladder 7. It floats from above and turns to the lower right direction, and the upper end of the intermediate ladder 8 is supported on the lower ladder support surface 6 formed on the lower end of the underframe 4 and is intermediate on the lower end surface of the upper ladder 7. Part ladder 8
The upper end of the upper ladder 7 is in an abutting state, and the intermediate ladder 8 is continuous with the extension of the upper ladder 7. Then, the bending link 1 connected to the long link 11 by turning the long link 11
3 move at the same time, the lower ladder 9 turns around the hinge 14, and its lower end and the support stand 12 come into contact with the floor surface.
In this state, a limit switch (not shown) operates to stop the forward / reverse rotation motor 15 and form the ascending stage state. Further, when each ladder is stored, it operates in the reverse manner of the above-mentioned ladder installation state and is stored. That is, when the forward / reverse rotation motor 15 is rotated in the direction in which the belt 16 is wound up, the intermediate portion ladder 8 is pulled by the belt 16 so that the long link 1
As a result of the steps 1 and 10, the upper ladder 7 is swung up so that the upper ladder 7 and the lower ladder 9 are folded onto the intermediate ladder 8.
After that, the lid 2 is rotated in the closing direction about the pivot shaft 3, and the upper, middle, and lower ladders are stored in the storage frame 1 in a stacked state, and the opening of the storage frame 1 is covered with the lid. It is closed at 2. Then, when closed, the limit switch (not shown) stops the forward / reverse rotation motor 15 to end the winding.

[0009]

According to the above-described ceiling storage ladder device of the present invention, when a flexible member such as a belt is fed out, the lid body is opened to a predetermined angle by the weight of the ladder device, The weight of the middle ladder acts on the long and short links connecting the underframe to the middle ladder, which is in a swiveling state with respect to the upper ladder and translates downward to be positioned on the extension line of the lower end of the upper ladder. , Folding link 13 connected with long link 13
As a result, the lower ladder is positioned on the extension line of the lower end of the intermediate ladder, and the upper ladder, the intermediate ladder and the lower ladder are aligned with each other, and in the use state each continuous boundary portion between the upper ladder, the intermediate ladder and the lower ladder. There is no discontinuous step difference or landing wide footboard surface, so it is possible to move up and down the stairs with the same rhythm. It is possible to provide a ladder device for a ceiling storage that eliminates the danger of getting out of order and getting caught or stepping off, and that secures the quickness of raising and lowering and safety.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a ladder storage state by breaking a storage frame of a ladder device for ceiling storage of the present invention.

FIG. 2 is a schematic side view showing a state in which the lid body is open.

FIG. 3 is a schematic side view of a usage state in which the upper, middle and lower ladders are straightened.

[Explanation of symbols]

1 Storage Frame 2 Lid Body 3 Pivot Shaft 4 Base Frame 5 Opening Angle Control Lever 6 Middle Ladder Support Surface 7 Upper Ladder 8 Middle Ladder 9 Lower Ladder 10 Short Link 11 Long Link 12 Support Stand 13 Bending Link 14 Hinge 15 forward / reverse rotation motor 16 belt 17 first trochanter 18 second trochanter

Claims (2)

[Claims] 1. A lid body is pivotally attached to a lower edge of a storage frame provided at a ceiling opening so that the lid body can be opened one-sided, and an opening angle regulating means for the storage frame and the lid body is provided. An upper ladder is fixed to the upper surface of the lid, an intermediate ladder and a lower ladder are stacked on the upper surface of the upper ladder, and one of the lower ladder and the intermediate ladder and the upper ladder and the storage frame are provided with ropes and belts. In a ladder device for a ceiling storage in which a flexible member such as the above is spanned, and the flexible member is wound and unwound by an electric drive means, the upper ladder is fixed to a lid through an underframe. At the same time, the underframe and the intermediate ladder are connected to each other by the parallel link mechanism using the short links on the upper side and the long links on the lower side, and the lower ladder with the bending link is hinged on the lower end of the intermediate ladder. Combined, the free end of the long link and the bend The link is pivotally connected, and the flexible member is extended from the stored state of each ladder to open the lid partly, the middle ladder moves in parallel by turning down, and the long link and the bending link operate. The hinge of the lower ladder is used as a fulcrum to open each ladder in a linearly extended state, and by winding the flexible member from the extended state, the lower ladder and the intermediate ladder are operated as described above. Is operated in reverse to overlap the upper ladder and form a ladder storage state by closing the lid body. 2. The ladder device for ceiling storage according to claim 1, wherein a support stand is fixed to the lower ladder.