Folding ladder and bed with folding ladder

Abstract

To divert a ladder foldable into a bar shape as a handrail or a protection fence.SOLUTION: A folding ladder of this invention is a folding ladder that can be folded into a single bar shape in which a pair of frames consisting of a wide head through a notch-shaped step on a side of one end of top and bottom and a narrow long rod extending from a step toward the other end, which are vertically and horizontally reversed, are connected in a form of parallel links with multiple crosspieces serving as treads, and the long rods are overlapped with each other. It can be used as a handrail or protective fence by forming a mortise-shaped recess that opens to the side of the step where it abuts against the end face of the long rod of the head and is positioned and fixed in the front, back, left, and right directions by a mortise. In addition, a peripheral wall of the recess is composed of an inner surface of an U-groove-shaped or square-groove-shaped recess formed in the step of the head of one frame in plan view, and the end face of the long rod facing the recess.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] This invention relates to a folding ladder that is suitable for use as a bed ladder for climbing up and down to beds that are placed at a high position, such as beds in campers, the second or higher levels of a multi-tier bed, and in particular can be converted into a protective fence or handrail to prevent people or objects from falling from the bed when folded, and can also be used for other general purposes, and a folding ladder bed equipped with said ladder. [Background technology]

[0002] Conventionally, a ladder for climbing up and down a bunk bed that is designed to prevent people or objects from falling off the bed is known as disclosed in Patent Document 1, and ladders whose left and right main posts (frames) can be folded into parallel links are known from Patent Document 2 and other ladders that have been known for a long time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2631176 [Patent Document 2] Japanese Utility Model Application Publication No. 49-115228 Summary of the Invention [Problem to be solved by the invention]

[0004] The bed ladder shown in Patent Document 1 has the upper end of one of the frames bent backwards into an L shape, and the bent end is rotatably supported on the side of the bed frame.It is used as a ladder when facing up or down, and when rotated horizontally and set up, it is used as a protective fence (circle) to prevent falls.

[0005] However, in this example, the ladder has left and right frames of different lengths, and one side is bent and protruding, making it difficult to repurpose as a ladder for other purposes. In addition, since the ladder does not require electrical wiring or storage space when not in use, it is considered to be fixedly attached to the bed frame.

[0006] Furthermore, in order to fix and support the ladder as a protective fence, a protective circle 2c for attaching the ladder and a removable sleeve 5 are required in advance, which has the disadvantage of being expensive in terms of cost.

[0007] On the other hand, the portable ladder that can be folded into a rod as described in Patent Document 2 requires less storage space when folded, but even if it is improved and used as in Patent Document 1, the problems with the invention in that document remain. In addition, when using the ladder as a protective fence in either the folded or unfolded position, it has the disadvantage that it lacks stability as a protective fence because it can be freely transformed into both positions. [Means for solving the problem]

[0008] The ladder of the present invention for solving the above problems is, firstly, a folding ladder in which a pair of frames facing up, down, left and right are connected in the form of parallel links by a plurality of rungs serving as treads, the pair of frames being made up of a wide head section and a narrow long rod section extending from a notched step section on the side of one of the upper and lower ends toward the other end, the long rod sections being overlapped on top of each other to form a single rod-like foldable ladder, the ladder having a mortise hole-like opening on the side where the step section butts the end face of the long rod section of the head section, and the ladder being fixed in position in the front, back, left and right directions by a mortise hole-like opening. Recess It is characterized in that it can be converted into a handrail or protective fence formed by the above method.

[0009] Next, the bed with a folding ladder is attached to the bed frame of a bed that is placed at a high position, and is characterized by the fact that the ladder is positioned and supported by fitting a recess downward into a tenon that protrudes upward from a receiving member that receives the ladder laterally in the folded state along the side edge of the bed, thereby creating a mechanism that can also be used as a protective fence for the bed.

[0010] Secondly, when the ladder is supported laterally along the side edge of the bed, the receiving surface formed on the base end side of the tenon of the receiving member is supported by simultaneously abutting against the side of the head portion of one folded frame and the peripheral end surface of the long rod portion of the other frame.

[0011] Thirdly, a tenon is inserted and fitted into the recess, restricting the upper frame from moving parallel to the lower frame and unfolding, thereby maintaining the folded position of the pair of frames. Effect of the Invention

[0012] The folding ladder for high beds of the present invention, configured as described above, can be used as a bed climbing ladder or for other purposes when unfolded, and when stored in the folded state it can be attached to the side edge of the bed as a fall prevention fence, so no special storage space is required, and as a protective fence it can be positioned and fixed while maintaining a stable folded position.

[0013] In particular, when used as a bed in a camper van, it has the advantage that it does not require storage space inside the vehicle and can be used for other purposes, such as for lifting and lowering luggage on shelves inside the vehicle or on the roof, as a bridge (plank) over uneven ground, or as a luggage rack. [Brief description of the drawings]

[0014] [Figure 1] 1 is a partial cross-sectional overall front view showing the ladder of the present invention in the folded and unfolded states. FIG. [Diagram 2] FIG. 2 is an enlarged cross-sectional view taken along line II-II of FIG. [Diagram 3] This is a front view showing the folded state in which it can be used as a protective fence for a bed, and the unfolded state in which it can be used as a normal climbing ladder (shown in phantom lines). [Figure 4] (A) is an enlarged view of the end of the frame in the folded state, and (B) is an enlarged view of the end of the frame in the unfolded state. [Diagram 5] 13 is an enlarged perspective view showing an example of a receiving member for a protective fence attached to the bed side. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Figures 1 to 5 show one embodiment of the present invention, and Figures 1 and 2 are partial cross-sectional front views of a ladder L in a folded position in which a pair of left and right frames (parent pillars) 1,1 are stacked on top of each other to form a single rod, and the imaginary lines indicate the deployed position in which the ladder is unfolded like parallel links.

[0016] The frame 1 is not particularly limited in material, but in this example it is made of wood and has the same structure and rotational symmetry, and the frames 1, 1 are connected rotatably by a plurality (four) rungs 2 of the same size and shape that make up the rungs, which are supported at both ends by pins 3. As shown in Figure 1, the rungs 2 can be used as a ladder by rotating (swinging) them 90° clockwise from the folded up-down position to stand them up.

[0017] Each frame 1 is formed into a hook shape as a whole when viewed from the front, with a wide head 1a at one end of a rod-shaped (prism-shaped) member with a rectangular cross section in the left-right direction, a right-angled step S of about 1 / 2 the width formed halfway through the head 1a, and a narrow long rod 1b extending from the step S to the other end with a cross section of about 1 / 2 the width. The two frames 1 are folded in a folded position when overlapped with each other in opposite directions up and down and left and right, with each long rod 1b fitting into the other step S. At this time, a parallel gap G of a predetermined distance is formed between the end face of the step S and the end face of the long rod 1b so that the end faces and corners do not interfere with each other when folding and opening.

[0018] 1 and 2, a multi-step storage groove M with a sawtooth bottom is formed on the overlapping surface between the long rods 1b of each frame 1, into which the ends of the crossbars 2 are inserted and supported, and which stores the crossbars 2 by half their width in a fallen position in which the ends of adjacent crossbars 2 are overlapped at an angle when folded. Furthermore, on the head 1a side of the step S of each frame 1, a mortise-shaped recess 4 is formed, which is a vertical square groove in side view, into which one end of the crossbars 2 at the top and bottom ends of the ladder L is inserted and supported so that it can be erected at a right angle or folded and stored.

[0019] As mentioned above, the left and right frames 1 can be folded and unfolded into a parallel link shape by rotating the crossbar 2 by 90 degrees, but because the recesses 4 are formed at right angles to the horizontal direction, the ladder shape is maintained by restricting the crossbar 2 at the 90° rotated and unfolded position (see Figures 1 and 4). In this unfolded state, the left and right frames 1 are aligned in length to form a rectangle, and their bottom ends are placed on a horizontal floor surface to be used as a ladder. When the left and right frames 1 are stacked together, they are folded into a single rod, and when placed horizontally, the recesses 4 open into a mortise-like shape on the bottom side.

[0020] Figure 3 shows a state in which a bed frame 8 constituting a bed 7 is supported horizontally on bed mounting parts 6 at the front and rear ends, which are formed, for example, by the side walls inside a camper van, with the ladder hung ready for use (shown by phantom lines), and a state in which the folded ladder L forms a fall protection fence supported parallel to the bed frame 8 in the transverse direction (horizontal direction).

[0021] In this example, vertical columnar receiving members 9, 11 are detachably attached facing upward in correspondence with the step S and recessed portion 4 of the folded ladder L. In the example shown, natural wood that branches into a Y-shape is used for the receiving members 9, 11, and the ladder L is supported horizontally between the two forks. However, the receiving members 9, 11 do not necessarily have to be made of naturally shaped forked wood, and they may be made of processed rectangular columnar material or made of pipe material.

[0022] One of the two forks of the receiving member 9 on the mortise-hole-shaped recess 4 side is provided with a tenon 12 that fits removably from the bottom of the recess 4 by joint processing, and a horizontal receiving surface 13 is formed on the lower end side of the tenon 12, which is a flat surface that receives both the head 1a of one frame 1 and the bottom surface of the long rod 1b of the other frame 1 at the step S, and the folded state is fixedly held in a fixed position when the ladder L is received. Incidentally, the side shape of the recess 4 corresponding to the tenon 12 is a square groove, but in this example, it forms a mortise hole together with the end surface of the other long rod 1b, which is one side of the gap G. The recess 4 and the tenon 12 are a square-shaped wooden insert structure that fits together, but the cross-sectional shape of the concave and convex parts can be circular or other cross-sectional shapes.

[0023] As configured as described above, when ladder L is used as a ladder, it is leaned against bed 7 as shown by the imaginary lines in Figure 2. However, when the bed is in use or the ladder is not in use, it can be kept on the side end of bed 7 and used to store the ladder. This has the advantage of not requiring space to store the ladder. In addition, when the ladder is used inside or outside the camper, it can be freely carried to the location of use and can be used for purposes other than as a ladder (for example, as a storage stand or a boardwalk in a mountain valley).

[0024] Furthermore, the folding ladder of the present invention has many advantages, particularly in terms of its versatility and storage space, when used as a bed in a camper van; however, it can also be widely used for bunk beds at home, beds for ships and other commercial use, as well as a ladder for general business and domestic use. [Explanation of symbols]

[0025] 1 Frame 1a Head section 1b Long rod part 2 Crossbar 3-pin 4 Recess 6 Bed storage area 7 Bed 8 Bed Frame 9,11 Support member 12 Tenon 13 Receiving surface L ladder S step part G Gap M Storage Groove

Claims

1. A folding ladder which can be converted into a handrail or protective fence, having a pair of frames which are opposite in the vertical and horizontal directions and which are composed of a wide head portion and a narrow long rod portion extending from the wide head portion to the other end via a notched step on the side at one of the upper and lower ends, and which are connected in the form of parallel links by multiple crosspieces which serve as treads, and which can be folded by overlapping the long rod portions together.The folding ladder can be converted into a handrail or protective fence, having a mortise-hole-shaped recess which opens on the side at the joint where the head portion meets the end face of the long rod, and which uses a mortise-hole to position and fix the ladder in the front-to-back and left-to-right directions.

2. A bed with a folding ladder equipped with the folding ladder described in claim 1, which is attached to the bed frame of a bed placed at a high position, and which has a receiving member that protrudes upward into a tenon that receives the ladder in the folded state laterally along the side edge of the bed, and which positions and supports the ladder by fitting a recess downward into the tenon, thereby creating a mechanism that can also be used as a protective fence for the bed.

3. A bed with a folding ladder equipped with a folding ladder as described in claim 2, in which, when the ladder is supported laterally along the side edge of the bed, the receiving surface formed on the base end side of the tenon of the receiving member is supported by simultaneously abutting against the side of the head portion of one folded frame and the peripheral end surface of the long rod portion of the other frame.

4. A folding ladder bed equipped with a folding ladder as described in claim 3, in which a tenon is inserted and fitted into the recess to restrict the upper frame from moving parallel to the lower frame and unfolding, thereby maintaining the folded position of the pair of frames.

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