JP4050263B2 - Ladder with handrail - Google Patents

Description

  The present invention relates to a ladder with a handrail, and relates to an extendable ladder used for evacuation or the like.

As a conventional stretchable ladder, there is one disclosed in Patent Document 1 previously proposed by the present applicant. The general configuration is that the support portions on both sides have a telescopic structure, and the ladder is extended to be in use, and when it is shortened, it is in a storage state that is not bulky. At the time of extension, the distance between the crosspieces forming the ladder steps changes so as to increase, and the state approaches when shortening. It should be noted that in the extended use state, the locking means is acting so that the load is not shortened even if a load is applied to the cross rail.
Japanese Patent Publication No. 8-9938

Ladder has many uses. For example, there is also an application used when a passenger moves to the ground from a passenger vehicle stopped at a position where there is no platform due to failure or accident of a railway vehicle. In this case, the ladder is used for a passenger to safely get off the ground from a high vehicle, but often it is not so urgent. In such a case, even with an evacuation ladder, safety and ease of use are more important than urgency. Nonetheless, ladders for evacuation are usually not used unless there are special circumstances, and are generally stored so as not to get in the way. Required. And this kind of ladder is not something that the user is accustomed to using like a working ladder, so it needs to be easy to use to some extent, and it is conceivable to provide a handrail for one of them. However, when a handrail is provided on a ladder that can be folded small, there is a problem that the structure becomes complicated and becomes bulky during storage.
An object of the present invention is to provide a ladder with a handrail that can be applied for evacuation with a simple configuration that is not bulky during storage.

The ladder with a handrail according to the present invention comprises a plurality of basic members each consisting of a pair of support columns that are arranged in parallel with a space therebetween and that are hollow inside, and a horizontal beam provided between the upper ends of both support columns. The struts are sequentially formed with different thicknesses, and the thin base members of the struts are sequentially slidably fitted into the both struts of the thickest basic member of the struts from above. It is possible to change between a shortened state in which the horizontal crosspieces of the basic members are in contact with each other and an extended state in which the horizontal crosspieces of the basic members are appropriately separated and the support columns are fitted, except for the uppermost one. In a ladder in which a locking means for holding the extended state is provided in the horizontal beam portion of the basic member, one end of each of the support members of the uppermost basic member is rotatably fitted and bent above it. And the other end extended downward reaches the vicinity of the lower end of the ladder in a shortened state. Handrail rotation locking means provided on a horizontal rail portion of the uppermost basic member so that the handrail member is locked at a rotation position that is a predetermined use position; And a hook for supporting the ladder provided on the ladder back side of the basic member .

  The ladder with a handrail has a short vertical dimension in a shortened state for storage, and the handrail member can be rotated along the back or front of the ladder, so that it is not bulky. In order to enter the use state, when the locking means is actuated in the extended state, the state of the ladder is maintained and the state is maintained. The handrail member is rotated to the use position protruding to the front side of the ladder, and the handrail rotation mechanism is engaged. When the stop means is operated, the handrail is fixed to the ladder. As a result, the hook on the upper part of the back of the ladder can be used by being hooked on an appropriate transverse member at the place of use. In the state of use, there is a handrail near the top edge of the ladder, so the user can grab the handrail when placing his foot until the fifth step when the user starts to get off from a high place. It is easy to get off because you can feel the size of the steps.

Further, the handrail rotation locking means is configured to perform a rotation locking action even in the storage rotation position of the handrail, and the handrail member is in the shortened state at the storage rotation position. It has a restraining means for restraining to a shortened state (Claim 1). In this configuration, when the handrail member is in the retracted rotation position with the basic member in the shortened state, that is, when folded, the basic member is restrained in the shortened state, that is, restrained so as not to extend, and the handrail member Since it is locked so as not to rotate by the movement locking means, the basic member will not be inadvertently extended, and the handrail member will not rotate, making it easy to carry in a folded state. .

The locking means is a protruding member that protrudes by being spring-biased from the horizontal beam portion in a predetermined extended state of the basic member and is inserted into a small hole provided through the overlapping portion where the support column portion is inserted. It is preferable to have a configuration (Claim 2) having a release operation portion configured to retreat the protruding member of the locking means against a spring. In this configuration, when the ladder is extended and the locking means is operating, the projecting member is pushed by the spring and is inserted into the small hole. To change from the extended state to the shortened state for storage, the projecting member is retracted by the release operation part, and the release operation force that the projecting member is retracted is released after the corresponding column part is slightly displaced in the shortening direction. Then, the front end of the projecting member abuts on the outer peripheral surface of the inner support column, and the support column can be brought into a predetermined shortened state. On the contrary, in order to change from the shortened state to the extended state, if the suspended state is provided with a space for extending the ladder below, the extended state is caused by its own weight, and the protruding member of the locking means protrudes by the action of the spring. The locking means is activated. In other words, the ladder is in an extended state. This configuration is an advantageous configuration for quickly changing from the stored state to the use state.

The handrail rotation locking means protrudes by being spring-biased from the horizontal beam portion of the uppermost basic member, and penetrates the overlapping portion between the column portion and the portion of the handrail member fitted in the column portion. A second projecting member that fits into the small hole provided, and the small hole provided in the handrail member corresponds to a use pivot position and a storage pivot position of the handrail member, and the second projecting member It is preferable to have a structure having an unlocking operation portion that retreats the spring against the spring (claim 3) .

The inventions according to the first and third aspects are provided with handrails that are stretchable and easy to use, but have an effect that the entire structure of the ladder is simple and not bulky in the stored state. Furthermore, since the handrail member is locked so as not to rotate by the handrail rotation locking means, the basic member does not extend carelessly. Also, the handrail member does not rotate, and there is an effect that it is easy to carry in the folded state. The invention according to claim 2 has an advantageous effect when the storage state is quickly changed to the use state.

  A plurality of basic members including a pair of support columns that are arranged in parallel with a space therebetween and that are hollow inside and a horizontal beam provided between the upper ends of both support columns are used. The basic members are formed by sequentially changing the thickness of the struts, and the thin basic members of the struts are slidably inserted from above into both struts of the thickest basic member of the struts. It is formed so as to be changeable between a shortened state in which the crosspieces of the members sequentially contact each other and an extended state in the form of a ladder in which the horizontal crosspieces of the respective basic members are appropriately separated and the support columns are fitted. Locking means for holding the extended state of the basic member is provided on the crosspiece of the basic member except the uppermost one. A handrail member is provided in which both ends of the uppermost basic member are rotatably fitted, bent at the upper end thereof, and extended downward to reach the lower end portion in the shortened state. Handrail rotation locking means is provided on the horizontal rail portion of the uppermost basic member so that the handrail member is locked at the rotation position at which the handrail member is at a predetermined use position. Also, a hook for supporting the ladder provided on the ladder back side of the uppermost basic member is provided.

  One embodiment of the present invention will be described with reference to FIGS. This ladder 1 with a handrail includes a plurality of basic members 2a, 2b, 2c, 2d,... 2m, 2n, a locking means 3, a release operation section 4, a handrail member 5, a handrail rotation locking means 6, and a restraining means. 7, a second release operation unit 8, a hook 9, and the like.

  The basic members 2a, 2b, 2c,..., 2m, 2n (hereinafter abbreviated as 2 when not specified) are arranged in parallel and spaced apart from each other as shown in FIGS. Is a hollow column (aluminum extraction pipe) 11a, 11b, 11c,... 11m, 11n (hereinafter abbreviated as 11 when not specified) and a horizontal beam provided between the upper ends of both columns. 12a, 12b, 12c,... 12m, 12n (hereinafter abbreviated as 12 when not specified), and a plurality of the basic members (a number substantially corresponding to the number of steps of the ladder) The base members 2b, 2c, 2d,..., 2m, and 2n with the narrower strut portions are sequentially slid onto both strut portions 11a of the thickest basic member 2a of the strut portion. Each of the basic members is movably fitted from above. Appropriately, each of the horizontal beam portions 12 of the basic members 2 has a size corresponding to one stage of the ladder so that the horizontal beam portions 12 are in a shortened state in which the horizontal beam portions 12 sequentially contact each other vertically (as shown in FIG. 1). It forms so that it may be in the expansion | extension state (state shown in FIG. 2, FIG. 3) in which each support | pillar part 11 fits sequentially. Each of the basic members 2 is firmly coupled and formed so that each pair of column portions 11 and 11 and the corresponding horizontal beam portion 12 provided for each column portion 11 and 11 are integrated. The lowermost support column part 11a is formed to be a little longer downward, and in addition to the horizontal beam part 12a, a similar horizontal beam part 12a 'is provided at a position one dimension below the lower part. In FIG. 1 and FIG. 2, reference numeral 13 shown at the lower end of the support 11a is a rubber stopper-like anti-slip member.

  For example, as shown in FIGS. 5 (a) and 5 (b), the structure in which the support column portion 11 and the cross beam portion 12 constituting the basic member 2 are coupled to the upper end of the support column portion 11 is fitted. The ring member 16 and the step member 17 fixed by the set screw 15 screwed into the set screw screwed portion 14 are coupled and fixed. That is, the aluminum extrusion molded product in which the ring member 16 is integrally formed with the step member supporting projection 18 projecting inward, that is, the cross-sectional molded product seen in FIG. 5A is cut at right angles to the extrusion direction. The step member support protrusion 18 is obtained by fitting and fixing the step member 17 obtained by cutting the aluminum extruded shaped article having a cross-sectional shape shown in FIG. 5C into a predetermined length. . The fitting is press-fitting and has a retaining structure with minute engagement protrusions and is firmly fixed. The step member 17 is slightly different in length for each basic member 2 but has the same cross-sectional dimension. This configuration is advantageous in production. In the figure, reference numeral 19 denotes a cap member for closing the hole on the upper surface.

  The locking means 3 holds the extended state of each basic member 2, and the release operation part 4 releases the operating state of the locking means. As shown in FIGS. 1 and 5, the locking means 3 is a step member in which the step members 17 of the basic members 2b, 2c, 2d,..., 2m, 2n except the uppermost basic member 2n are fitted. It is provided inside the support protrusion 18. The locking means 3 advances and retreats so that the small columnar protruding member 20 protrudes into the hollow portion 22 through the small hole 21 provided in the step support protrusion 18 through the overlapping portion of the column portions 11 and 11. It is supported so as to be urged in the protruding direction by urging means 23 comprising a coil spring. The release operation unit 4 has a configuration in which an operation knob 24 provided at the rear end of the protruding member 20 is protruded from a long hole 25 formed on the back surface of the step member 17. By operating the operation knob 24 against the biasing means 23 to retract the protruding member 20, the locking of the locking means 3, that is, the operating state can be released.

  As shown in FIGS. 1 and 3, the handrail member 5 has one end rotatably fitted to both column portions 11n of the uppermost basic member 2n, bent above and extended downward, The other end reaches the vicinity of the lower end of the shortened state of the ladder, and is formed of an aluminum pipe so as to form a restraint portion 7 by being slightly bent within the bending surface of the shape portion at a position slightly above the lower end. The part 26 is a rubber member. At the rotation position where the handrail member 5 is at a predetermined use position (see FIG. 3), the handrail rotation locking means 6 is provided on the horizontal rail portion 12n of the uppermost basic member 2n so that the rotation is locked. It is. The handrail rotation locking means 6 has the same configuration as the locking means 3 and is provided inside the step member support protrusion 18 to which the step member 17 is fitted. That is, although not shown again, as described in FIG. 5, the small cylindrical second projecting member is provided in the step support projection 18 so as to pass through the overlapping portion of the column 11 and the handrail member 5. It is supported so as to be able to advance and retract so as to protrude into the hollow portion through the small hole, and is urged in the protruding direction by urging means comprising a coil spring. The handrail second release operation portion 8 of the handrail rotation locking means 6 has the same configuration as the release operation portion 4 of the lock means 3, and is provided with an operation knob 24 that protrudes from the long hole 25.

  As shown in FIG. 4 (a), each of the support portions 11 and the fitting portion of the support portion 11 and the fitting portion of the uppermost support portion 11n and the handrail member 5 have the same configuration. A rattling prevention structure is provided, and an inner peripheral surface convex portion 27 is formed on the hole side, and an outer peripheral surface convex portion 28 is provided on the shaft side that is fitted in this, and both are engaged and come off. In a stopped state, two polygonal anti-rattle rings 29 shown in FIG. 4B are mounted on the shaft side at an appropriate interval. As a result, it is possible to obtain a configuration that is slidable and rotatable in the axial direction without rattling.

  The hook 9 is provided on the ladder back side of the uppermost basic member, and the ladder 1 can be hooked and supported on a suitable lateral member in the use state.

  In the state where the ladder is folded in a shortened manner, as shown in FIG. 1, each crosspiece 12 abuts up and down, one handrail member 5 is on the front side of the ladder 1, and the other handrail member 5 is on the back side. It is the state which exists in the position which follows Further, in the extended state, as shown in FIG. 2, the crosspiece 12 separates to form the steps of the ladder 1, and the locking means 3 as shown in FIGS. 5 (a) and 5 (b). The protruding member 20 protrudes and engages with the small hole 21, the unlocking operation portion 4 moves to the end portion side of the horizontal rail portion 12, and the handrail member 5 protrudes to the front side of the ladder. In order to change from the extended state to the shortened state, if the knob 24 of the unlocking operation part 4 of the horizontal beam part 12 of the basic member 2 is pushed inward, the locking of the column part 11 of the basic member 2 is released respectively. Therefore, in this state, the basic member 2 can be moved relative to each other to be in a shortened state in which each crosspiece 12 is in contact. Similarly, the handrail rotation locking means 6 is also unlocked by the second release operation unit 8 and rotated along the front and back surfaces of the ladder, and the handrail rotation locking means 6 is moved to the rotation position. Can be brought into the storage state (folded state) shown in FIG. At this time, the restraining means 7 formed by bending at the lower end of the handrail member 5 is engaged with the horizontal rail portion 12a 'at the lower end, restraining the freedom in the direction in which the basic member 2 extends, and lifting the folded ladder 1 Prevents the inadvertent extended state at times.

  It is installed in a railway vehicle and can be used when a passenger is moved from a stopped vehicle to the ground.

It is a rear view of the Example of this invention. It is a partial omission rear view which shows the expansion | extension state of the Example. It is the upper side view made into the handrail use state in the expansion | extension state of the Example. The part of the Example is shown, (a) is a cross-sectional enlarged view of the fitting state of a support | pillar part, (b) is a top view of a rattling prevention ring. The horizontal crosspiece | unit part of the Example is shown, (a) is a partially broken part abbreviation top view, (b) is a rear view corresponding to (a), (c) is an end surface enlarged view of a step member.

Explanation of symbols

1 Ladder 2 Basic members (unspecified)
2a, 2b, 2c, 2d,..., 2n Basic member 3 Locking means 4 Release operation part 5 Handrail member 6 Handrail rotation locking means 7 Restraint means 8 Second release operation part 9 Hook 11 Strut part (unspecified) )
11a, 11b, 11c, 11d,..., 11n Supporting column 12 Horizontal beam (unspecified)
12a, 12b, 12c, 12d,..., 12n Crosspiece 13 Non-slip member 14 Screw-in portion 15 Set screw 16 Ring member 17 Step member 18 Step support protrusion
DESCRIPTION OF SYMBOLS 19 Cap member 20 Protruding member 21 Small hole 22 Hollow part 23 Energizing means 24 Knob 25 Long hole 26 Spherical part 27 Inner peripheral surface convex part 28 Outer peripheral surface convex part 29 Shaking prevention ring

Claims (3)

A plurality of basic members each consisting of a pair of support pillars arranged in parallel with an interval and hollow inside and a horizontal crosspiece provided between the upper ends of both of the support pillars are sequentially added to the thickness of the support pillars. The thin base members of the struts are slidably fitted from above into the both struts of the thickest basic member of the struts, and the horizontal rails of the basic members are sequentially It is formed so that it can be changed between a shortened state in contact and an extended state in which the horizontal beam portion of each basic member is appropriately separated and the column portion is fitted, and the horizontal beam portion of the basic member excluding the uppermost one is formed. In the ladder provided with the locking means for holding the extended state, one end of each of the uppermost basic members is rotatably fitted, bent at the upper end thereof, and extended at the lower end. A handrail member that has reached the vicinity of the lower end of the ladder in a shortened state, and the handrail member has a predetermined A handrail rotation locking means provided on a horizontal rail portion of the uppermost basic member so that the rotation is locked at a rotation position which is a use position, and provided on the ladder back side of the uppermost basic member. A hook for supporting the ladder ,
The handrail rotation locking means is configured to rotate and lock even in the storage rotation position of the handrail, and the basic member in which the handrail member is in the shortened state at the storage rotation position is in the shortened state. A ladder with a handrail, characterized by having a restraining means for restraining to a rail.   2. The ladder with a handrail according to claim 1, wherein the locking means protrudes by being spring-biased from the horizontal rail portion in a predetermined extended state of the basic member and penetrates an overlapping portion where the support column portion is fitted. A ladder with a handrail, which is constituted by a projecting member that fits into a small hole provided, and has a release operation portion that retreats the projecting member of the locking means against a spring.   The ladder with a handrail according to claim 1 or 2, wherein the handrail rotation locking means protrudes by being spring-biased from the horizontal rail portion of the uppermost basic member and is fitted into the support column and the support column. A second projecting member that fits into a small hole that penetrates the overlapping portion of the handrail member, and the small hole provided in the handrail member defines the use rotation position of the handrail member and the storing rotation. A ladder with a handrail, which corresponds to a moving position, and has a handrail locking release operation section for retracting the second projecting member against a spring.

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