JP2010285779A - Folding type ladder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate handling by enclosing hooks within a range of thickness formed by a pair of support legs in the closed state of the pair of support legs. <P>SOLUTION: The pair of support legs 11, 12 are connected at one end with a hinge 13 so as to be openable/closable, and both support legs 11, 12 are provided with a plurality of rungs 16, 18 at required spaces between a pair of posts 15, 17. The rung 16 on the other end side of the support legs 11 is provided with the hooks 14 having shaft parts 20, inside the outer surfaces of the support legs 12 and in a state of facing the support leg 12 side. The shaft parts 20 are slidable along the posts 15 by guide bodies 21 provided at two parts of the rung 16. The guide body 21 is provided with a locking implement 23 for regulating sliding of the shaft part 20 in the state of the hook 14 being located at the rung 16. When the support legs 11, 12 are closed, the hooks 14 are located inside the outer surfaces of the support legs 12 and compactly settled with the shaft parts 20 within the range of thickness formed by the pair of support legs 11, 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a folding ladder that is used by being hung on a lap provided on a wall surface of a building when inspecting a cubicle, a water supply facility, or the like installed on a roof of a building such as a factory, an apartment, or a store.

  In general, on the rooftops of buildings such as factories, condominiums, stores, etc., management equipment such as cubicles, water supply facilities, and elevators are installed at higher heights, and when inspecting these facilities, climb to the rooftop, etc. A trap is attached to the outer wall of the building.

  As the wrapping, a ladder-like one or a plurality of U-shaped iron bars arranged in a vertical direction with a horizontally protruding bar is used. This trap is used only once a month when a cubicle or the like is inspected or once every several months. For this reason, it is often provided at a position higher than the height of the person so that it cannot be easily lifted for reasons of obstructing traffic or for security reasons.

  Therefore, when inspecting a trap such as an upward cubicle, a foldable ladder having a hook that is hooked on the trap is used (for example, see Patent Document 1). In this folding ladder, a pair of support legs are connected to each other by a hinge bracket so that the support legs can be opened and closed, and each support leg is provided with a plurality of steps in a vertical direction between a pair of support columns. The hooks (hooks) are fixed in the same direction to the other end portions of both support columns of one support leg.

  The pair of support legs are opened to ground the other support leg, and the hook of one support leg is hooked on the lap. Thereby, since a folding ladder is attached between the ground and the trap, it is possible to go up the trap and check the cubicle and the like.

JP 2002-227575 A

  By the way, the folding ladder described in Patent Document 1 has hooks fixed to the other ends of both columns. When the pair of support legs of the foldable ladder is closed, the fixed hook protrudes outward (outside in the opening / closing direction) from the other end of the pair of support legs (see Patent Document 1 FIG. 2). ).

  If the hook protrudes, when the folding ladder loaded in the cargo space such as an automobile trunk space or a truck is taken out, the hook is caught in the luggage and materials loaded together, and it is difficult to handle. Further, the thickness in the folded state is increased by the amount of protrusion of the hook, and it is necessary to secure an extra storage space.

  Accordingly, an object of the present invention is to facilitate handling by allowing a hook to be accommodated within a thickness range formed by a pair of support legs in a closed state.

  In order to solve the above-described problem, in the present invention, a pair of support legs are connected at one end thereof so as to be openable and closable, and the pair of support legs has a plurality of step bars between the pair of support columns. In the folding ladder provided with a hook on the other end of the one support leg, the hook is supported on the other side of the other support leg on the other side. It is possible to employ a configuration in which the hooks are positioned on the inner side of the outer surface of the other support leg with the pair of support legs closed, provided in a state facing the leg side.

  If it does in this way, the hook provided in the pedestal of one support leg will be located inside the outer surface (surface which faces the outside of the opening-and-closing direction of a pair of support legs) of the other support leg. For this reason, in a state where the pair of support legs is closed, the hook does not protrude from the outer surface of the other support leg and is accommodated within the thickness range formed by the pair of support legs. For this reason, even when the folding ladder is loaded on an automobile, a truck or the like, the hook does not get in the way, and handling at the time of loading and unloading becomes easy.

  In the above-described configuration, the hook includes a shaft portion at one end portion, and the shaft portion is provided to be slidable along the support column at two locations on the step rail of the one supporting leg, and the hook is connected to the shaft portion. It is arranged on the other end side of the one support leg, and adopts a configuration in which the slide of the shaft part moves from the inside of the other end of the one support leg to the outside of the other end. can do.

  According to this configuration, the shaft portion of the hook can be slid along the support column, and the hook can be positioned outside the other end portion of the one support leg. For this reason, the folding ladder in the open state can hook the hook against the trap at a higher position.

  Moreover, if a hook slides a shaft part, it can be located inside the other end part of one support leg (on the hinge side with respect to the other end part). At this time, since the hook is positioned inward of the outer surface of the other support leg with the pair of support legs closed, the hook is formed with the thickness formed by the pair of support legs together with the shaft portion. It can fit in a compact range.

  Two guide bodies are provided on the crosspiece at the other end of the one support leg, and the guide body allows the shaft portion of the hook to slide along the support column. It is possible to adopt a configuration including a lock unit that restricts the sliding of the shaft portion in a state of being located inside the other end portion of the one support leg.

  With this locking means, the hook is held in a state where the pair of support legs are closed and located on the inner side of the other end portion of the one support leg. The held hook does not protrude from the other end of one of the support legs, and is securely stored within the thickness range formed by the pair of support legs.

  Also, when using as a stepladder, when tilting the folding ladder or opening a pair of support legs, the shaft part slides and the hook protrudes from the other end part of one support leg, making handling difficult Can be prevented.

  In the present invention, the hook provided in the state in which the other support leg faces the step rail of one support leg is positioned inside the outer surface in the opening / closing direction of the other support leg. When both the support legs are closed, the support legs do not protrude from the outer surface of the support legs of the other support legs, and can be accommodated within the thickness range formed by the pair of support legs.

The perspective view which shows the self-supporting state of the folding ladder in Example 1 Front view showing the self-supporting state Rear view showing the self-supporting state Longitudinal sectional view showing the self-supporting state Top view showing the self-supporting state Bottom view showing the self-supporting state Side view showing the closed state Sectional drawing showing locking means Side view showing the self-supporting state Enlarged side view showing the hinge Side view showing the unfolded state Front view showing the unfolded state Rear view showing the unfolded state Rear view showing the sliding state of the shaft in the expanded state Enlarged rear view showing the shaft part The perspective view which shows the use condition same as the above

  1 to 15 show a folding ladder according to a first embodiment of the present invention.

  In the folding ladder according to the first embodiment, as shown in FIG. 1, a pair of support legs 11 and 12 are connected to each other by a hinge 13 at one end portion thereof, and a hook 14 is connected to the other end of one support leg 11. It is provided in the part.

  As shown in FIG. 2, the support leg 11 is provided with a plurality of step bars 16, 16... A pair of support | pillar 15 is formed from the metal frame, and the earthing | grounding end tool 19 with respect to the ground, a floor surface, etc. is provided in the other end part so that rotation is possible.

  Each crosspiece 16 is formed of a metal pipe, and as shown in FIG. 4, the surface facing one end side (the hinge 13 side) of the support column 15 is horizontal when used in a self-supporting state of the folding ladder. Provided. Further, the surface (the lower surface of the crosspiece 16 in FIG. 4) facing the other end portion side (the opposite side to the hinge 13 side) of the support column 15 is the folding ladder in the unfolded state of the pair of support legs 11 and 12. Provided to be horizontal when in use. Of the plurality of steps 16, the step 16 a closest to one end of the support leg 11 is the top plate in the self-standing state (see FIG. 5).

  As shown in FIG. 3, the support leg 12 is provided with a plurality of step bars 18, 18.. Yes. The pair of support pillars 17 are formed of a metal frame, like the support pillars 15, and the other end portions are provided with the grounding end pieces 19 so as to be rotatable with respect to the ground surface, the floor surface, and the like (see FIG. 6).

  Each step bar 18 is formed of a metal pipe, like the step bar 16, and is provided such that a surface facing one end of the support column 17 is horizontal when the folding ladder is used in a self-supporting state. Further, the surface of the support column 17 facing the other end side is provided so as to be horizontal when the folding ladder is used in the unfolded state of the pair of support legs 11 and 12. Of the plurality of step bars 18, the step bar 18 a closest to one end of the support leg 12 is the top plate in the self-standing state (see FIG. 5).

  Further, the standing tool 30 can be rotatably provided on the step rail 18c closest to the other end of the support leg 12 as necessary. The standing tool 30 is formed of a hard synthetic rubber having a ground curved portion along the outer surface of the utility pole, and stably stands the folding ladder in a deployed state of the pair of support legs 11 and 12 against the utility pole. Can do.

  Of the pair of support legs 11 and 12, the support leg 11 includes a hook 14 on the inner side of the tread bar 16 (inside the opening and closing direction of the pair of support legs 11 and 12), as shown in FIG. The hook 14 is formed by forming a metal rod in a bowl shape, and includes a shaft portion 20 made of a metal pipe fixed to one end portion.

  The shaft portion 20 of the hook 14 is held so as to be slidable along the support column 15 by a guide body 21 provided on the step rail 16 of the support leg 11. The guide body 21 is formed of a metal pipe into which the shaft portion 20 can be inserted, and is stretched between the step rail 16c closest to the other end of the support leg 11 and the step rail 16b adjacent thereto. It is provided in two places.

  As shown in FIG. 1 and FIG. 2, the guide bodies 21 are fixed in parallel to each other along the support column 15 by fixing brackets 22 on the insides of the tread bars 16 b and 16 c. The shaft body 20 is held by the guide body 21 in a state where the hook 14 is located on the other end side of the support leg 11.

  In addition, the hook 14 slides from the step rail 16 c of the support leg 11 to the outside of the other end of the support leg 11, that is, other than the support leg 11, as the shaft portion 20 slides in the guide body 21. It is located from the inner side of the end part to the outer side of the other end part.

  Further, as shown in FIG. 7, the tip end portion of the hook 14 is directed to the support leg 12 side with the pair of support legs 11 and 12 closed, and is located inside the outer surface of the support column 17 of the support leg 12. is doing. For this reason, the hook 14 is accommodated within the thickness range formed by the pair of support legs 11, 12 without protruding from the outer surface of the support legs 12 with the pair of support legs 11, 12 closed.

  As shown in FIG. 2, each guide body 21 includes a locking device 23 (locking means) that restricts the sliding of the shaft portion 20 of the hook 14 on the opposing surfaces. As shown in FIG. 8, the locking device 23 includes a bottomed inner cylindrical body 24 and an outer cylindrical body 25 that form a cylindrical shape that fits into each other, and a latch integrally formed with the outer cylindrical body 25. It consists of a pin 26 and a coil spring 27 attached to the locking pin 26.

  The inner cylinder 24 is fixed to a part of the fixing bracket 22 located on the facing surface of the guide body 21 and the guide body 21. The outer cylindrical body 25 has a locking pin 26 standing at the center of the bottom, and the locking pin 26 penetrates the center of the bottom of the inner cylindrical body 24. A ring 28 is fitted and fixed at the center in the axial direction of the locking pin 26, and a compressed coil spring 27 is mounted between the ring 28 and the inner surface of the bottom of the inner cylinder 24.

  The locking pin 26 of the outer cylindrical body 25 passes through the bottom portion of the inner cylindrical body 24, the fixing bracket 22 and the guide body 21, and is locked in a hole 29 provided in the shaft portion 20 of the hook 14. When the outer cylindrical body 25 is pulled out, the locking pin 26 is also pulled out, the locked state with the hole 29 of the shaft portion 20 is released, and the shaft portion 20 can slide within the guide body 21 (FIG. reference).

  Further, the outer cylindrical body 25 having an elliptical cross section can be pulled out and rotated about 90 degrees so that the outer cylindrical body 25 is not engaged with the inner cylindrical body 24. In the hooked state, the shaft portion 20 of the hook 14 can slide in the guide body 21. Thereby, as shown in FIGS. 13 and 14, the position of the hook 14 can be adjusted in accordance with the position of the target object T (for example, the wire stretched around the above-mentioned trap or cubicle). It becomes possible.

  Thereby, both the hooks 14 can be reliably hooked with respect to the target object T, and the folding ladder in the unfolded state can be fixed (see FIG. 15). Further, the shaft portions 20 of the hooks 14 respectively held by the pair of guide bodies 21 can slide independently of each other. For this reason, it is possible to cope with the case where the object to be hooked by the hook 14 is not horizontal.

  Here, the length of the shaft portion 20 of the hook 14 is not particularly limited, but may be at least as long as the length of the guide body 21. For example, as shown in FIG. The length from the side rail 16c closer to the one end to the side rail 16a closest to the one end is preferable because the hook 14 can be hooked on a higher level lap.

  In a state where the locking pin 26 of the outer cylindrical body 25 is locked in the hole 29 of the shaft portion 20, the coil spring 27 in the compressed state urges the locking pin 26 toward the guide body 21 via the ring 28. . Thereby, the locked state of the locking pin 26 and the hole 29 is maintained. Therefore, the hook 14 is held in a state where it is located on the inner side of the other end portion of the one support leg 11 (closer to the hinge 13 than the other end portion of the support leg 11).

  The hook 14 does not protrude from the support leg 11 due to the locking of the locking pin 26 and the hole 29 of the shaft portion 20, and is securely within the thickness range formed by the pair of support legs 11 and 12 in the closed state. (See FIG. 7). The position of the hole 29 of the shaft portion 20 is related to the locking pin 26 in a state where the hook 14 is closer to the hinge 13 than the other end portion of the support leg 11, for example, the hook 14 is closest to the step rail 16c. Any position that can be stopped is acceptable. It is also possible to form a plurality of holes 29 at a required interval. In this case, the shaft portion 20 can be slid to a required position, and the hook 14 can be held at that position.

  In this embodiment, when it is not necessary to change the position of the hook 14 or when the position of an object to be hooked is determined in advance, only the hook 14 having a hook shape without the shaft portion 20 is supported. It can be provided in the state which faces the support leg 12 side at the step 16 of the leg 11. In this case, the hook 14 may be positioned inside the outer surface of the support column 17 of the support leg 12 with the pair of support legs 11 and 12 closed. Thereby, the structure of the hook 14 becomes simple, the storage property of the hook 14 is ensured, and the weight is reduced.

  As shown in FIG. 9A, the hinge 13 that connects the pair of support legs 11 and 12 so as to be openable and closable includes a pair of hinge pieces 31 and 31 and a hinge pin 32 that connects them. The pair of hinge pieces 31, 31 are respectively fixed to the outer surface of one end of one of the columns 15, 17 (the surface opposite to the installation surface of the treads 16, 18), and from one end of the columns 15, 17. The ears 33 are formed integrally so as to face inward. In a state where the ears 33 are overlapped with each other, a bolt as a hinge pin 32 is inserted into a hole provided in the ear part 33, and a nut is fastened to couple the pair of hinge pieces 31 to each other so as to be rotatable.

  Moreover, the well-known engagement metal fitting 34 which consists of two metal pieces is attached to one hinge piece 31 of the hinge 13 so that rotation is possible. By engaging the engaging metal fitting 34 with the pin 31a provided on the other hinge piece 31, the self-standing folding ladder is prevented from opening more than necessary.

  Further, as shown in FIGS. 11 and 12, in a deployed state of the pair of support legs 11 and 12, the engagement fitting 34 can be engaged with a pin 31 b provided on the other hinge piece 31, and the pair of support legs is supported. It is considered as a safety device that prevents the legs 11 and 12 from being closed during use (see the dashed line in FIG. 9B).

  Hinge pieces 31 and 31 are also fixed to one end portion of the other struts 15 and 17 as well as one end portion of the one struts 15 and 17, and are connected to holes of the ear portions 33 by bolts and nuts. Engagement fittings 34 are also provided on the hinge pieces 31, 31.

  The pair of support legs 11 and 12 connected by the hinge 13 are developed in such a manner that, for example, the support leg 11 is rotated upward from the self-standing state shown in FIG. It becomes possible to be in a state (one-dot chain line in FIG. 9B). Further, in this unfolded state, as shown in FIG. 10, the pair of support legs 11 and 12 are positioned on a straight line, and from this state, the support legs 11 and 12 of the both support legs 11 and 12 are folded and closed. It is.

  As shown in FIGS. 11 and 12, the foldable ladder in this embodiment has a pair of support legs 11 and 12 in an unfolded state by the hinge 13 and the engagement fitting 34. In this unfolded state, the ladder is usually It can be used as

  Here, when the trap T is provided at a position higher than the full length of the folding ladder in the unfolded state, the shaft portion 20 of the hook 14 may be slid upward and hooked on the trap T as shown in FIG. it can.

  When the hook 14 is hooked on the trap T, as shown in FIG. 15, the folding ladder is stabilized, and it is possible to go up the trap and inspect equipment such as a cubicle.

  Further, the folding ladder of this embodiment can be used as a stepladder as shown in FIG. In this case, the slide of the shaft portion 20 of the hook 14 is regulated by the lock member 23 of the guide body, and the hook 14 is held by the step rail 16 c of the support leg 11. For this reason, the hook 14 does not get in the way even when used as a stepladder.

  After the folding ladder is used, the pair of support legs 11 and 12 are completely closed as shown in FIG. When the support legs 11 and 12 are closed, the locking member 23 restricts the sliding of the shaft portion 20 of the hook 14. At this time, the tip of the hook 14 does not protrude from the outer surface of the support leg 12. For this reason, the hook 14 can be accommodated in the thickness range formed by the pair of support legs 11 and 12 in the closed state.

DESCRIPTION OF SYMBOLS 11 Support leg 12 Support leg 13 Hinge 14 Hook 15 Support | pillar 16,16a, 16b, 16c Foot cross 17 Support post 18, 18a, 18c Foot cross 19 Grounding edge tool 20 Shaft part 21 Guide body 22 Fixing bracket 23 Locking tool 24 Inner cylinder 25 Outer cylindrical body 26 Locking pin 27 Coil spring 28 Ring 29 Hole 30 Standing tool 31 Hinge piece 31a Pin 31b Pin 32 Hinge pin 33 Ear part 34 Engagement fitting T Target (talp)

Claims (3)

  A pair of support legs are connected at one end thereof so as to be openable and closable via a hinge, and the pair of support legs is provided with a plurality of step bars provided at a predetermined interval between a pair of support columns. In the folding ladder in which a hook is provided at the other end of the support leg, the hook is provided in a state in which the hook is directed to the side of the other support leg on a step rail on the other end side of the one support leg. The folding ladder according to claim 1, wherein the hook is positioned inside the outer surface of the other support leg in a state where the support leg is closed.   The hook includes a shaft portion formed at one end portion, and the shaft portion is provided to be slidable along the support column at two places on the step rail of the one supporting leg, and the hook is configured so that the hook includes the shaft portion. It is arrange | positioned at the other end part side of one support leg, and it is made to move from the inner side rather than the other end part of said one support leg to the outer side from the other end part by the slide of the said shaft part. Item 2. The folding ladder according to item 1.   Two guide bodies are provided on the crosspiece at the other end of the one support leg, and the guide body allows the shaft portion of the hook to be slidable along the support column. The foldable ladder according to claim 2, further comprising a lock unit that regulates sliding of the shaft portion in a state of being positioned inside the other end portion of the one support leg.

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