JP2007186898A - Expansion ladder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion ladder which can protect the finger of the operator from being pinched at the time of contracting the same, and provides safe expansion/contraction work of the ladder. <P>SOLUTION: The expansion ladder is formed of portal ladder members 1<SB>1</SB>to 1<SB>n</SB>which are formed of a pair of cylindrical side frame members 2<SB>1</SB>to 2<SB>n</SB>, 2<SB>1</SB>to 2<SB>n</SB>arranged on both sides thereof, and rungs 3<SB>1</SB>to 3<SB>n</SB>which are horizontally extended between upper edges of both the side frame members 2<SB>1</SB>to 2<SB>n</SB>, 2<SB>1</SB>to 2<SB>n</SB>shown in Fig. 6, and set up by fitting the side frame members 2<SB>1</SB>to 2<SB>n</SB>to each other like a nested structure. In order to protect the finger of the operator from being pinched by the rungs 3<SB>1</SB>to 3<SB>n</SB>of the portal ladder members 1<SB>1</SB>to 1<SB>n</SB>, the expansion ladder is comprised of space retaining means 6 for holding spaces S between the rungs 3<SB>1</SB>to 3<SB>n</SB>, that are necessary for preventing finger pinching. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a side frame member of a gate-type ladder member which is formed in a gate shape by a pair of cylindrical side frame members on both sides and a step bar horizontally mounted between upper end portions of both side frame members and arranged in a plurality of upper and lower stages. The present invention relates to an improvement of a telescopic ladder that can be telescopically fitted with each other in a nested manner.

6 (a) is a perspective view showing a conventional aluminum telescopic ladder B in an expanded state, FIG. 6 (b) is a perspective view showing the telescopic ladder B in a contracted state, and FIG. 7 is a telescopic ladder B in the contracted state. FIG. _{5 is} a partially enlarged cross-sectional view of the second to fourth portal ladder members 1 ₂ to 14 from the bottom, for example. In this telescopic ladder B, each of the portal ladder members 1 ₁ to 1 _n is a pair of cylindrical side frame members 2 ₁ to 2 _n and 2 ₁ to 2 _n and both side frame members 2 ₁ to 2 _n and 2 ₁ to 2. It consists of a _{to n} upper ends laterally placed linked stepping crosspiece 3 ₁ to 3 _n of the opposite ends of each stepping bar 3 ₁ to 3 _n are each side frame member _{2 1 ~2 n, 2 1 ~2} n Are integrally connected to the treadle-mounting short pipe members 4 ₁ to 4 _n that are fitted and fixed to the upper end of each of the treadles, and at the lower end side of each of the treadle-mounting short pipe members 4 ₁ to 4 _n , Rubber shock-reducing rings 5 _{1 to} 5 _n are formed on the side frame members 2 ₁ to 2 _n to relieve shock when the short pipe members 4 ₁ to 4 _n adjacent to each other collide with each other when the ladder contracts. It is fitted and attached. Incidentally, crosspiece 3 ₀ stepping to the lower end of each side frame member 2 _1, 2 ₁ are attached to the portal ladder member 1 ₁ of the bottom.

Each gate-shaped ladder member 1 ₁ to 1 _n is provided at both ends of each of the step bars 3 _{1 to} 3 _n to hold the step bars of the upper ladder member and the lower step bars at regular intervals when the ladder is extended. Stopper means 9 is provided. The stopper means 9 has a stopper pin 12 integrally attached to a slider 11 that slides inside each of the step bars 3 _{1 to} 3 _n , and a tip portion 12a of the pin 12 is an opening of each short tube member 4 ₁ to 4 _n . 13, a coil spring 15 that urges the side frame members 2 ₁ to 2 _n so as to protrude from the pin insertion holes 14 of the side frame members 2 ₁ to 2 _n , a slider 11, and a pin guide 16 fixed to each of the step bars 3 _{1 to} 3 _n An operation piece 17 (shown in phantom line) is provided on the front side of each of the step bars 3 _{1 to} 3 _n to slide the slider 11 against the urging force of the coil spring 15. The operating piece 17 is attached to the slider 11 by an attachment shaft 18 (illustrated phantom line). The attachment shaft 18 is a long hole 19 (illustrated imaginary line) that is provided in the front side wall of each of the step bars 3 _{1 to} 3 _n. Is inserted.

When the ladders B is stretchable is, to describe the stopper pin 12, for example, a ladder member 1 ₃ side of FIG. 7, the distal end portion 12a of the stopper pin 12 is protruded from the pin insertion hole 14 of the side frame member 2 ₃ , the side frame member 2 ₄ of the upper side ladder member 1 ₄ in contact with the state. Thus, when the ladder 3 _n of the uppermost portal ladder member 1 _n is pulled up when the ladder is extended, the tip end portion 12a of the stopper pin 12 of the second ladder member from the top becomes the upper ladder member 1 _n. Is inserted into a locking pin hole (not shown) provided at the lower end of the side frame member 2 _n and locked, whereby the second-stage ladder member is pulled from the top, and the third-stage ladder from the top. The distal end portion 12a of the stopper pin 12 of the member enters and locks into a locking pin hole (not shown) at the lower end portion of the side frame member of the ladder member in the second stage from the top. It will be in the extended state as shown in a).

When folding the contracted state shown from the extended state shown in FIG. 6 (a) to (b) is an operation piece 17 in the stepping crosspiece 3 ₁ of the bottom side ladder member 1 ₁ is slid against the coil spring 15 Te, when unlocking the stopper pin 12, the second lowest depressed to the second ladder member 1 ₂ of the side frame member 2 ₂ is lowermost side ladder member 1 ₁ of the side frame member 2 in ₁ from the bottom ladder member 1 ₂ is folded in a ladder member 1 ₁ of the bottom. Thereafter, similar contraction is performed to sequentially fold, and the contracted state shown in FIG.

As shown in FIG. 7, the conventional telescopic ladder B has a narrow space s between the step bars 3 _{2 to} 3 _{4 of the} portal ladder members 1 ₁ to 1 _n adjacent to each other when the ladder is contracted, as narrow as 6 mm. Fig. 6 (a)
When performing the folding and shrinking work from the stretched state shown in (b) to the contracted state shown in (b), the operator's fingers may be pinched between the stepped bars adjacent to each other, particularly the lower side The work was extremely dangerous because a considerable load was applied by the multi-stage portal ladder members on the upper side.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a telescopic ladder capable of preventing finger padding when the ladder contracts and performing a ladder telescopic work safely.

Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is a pair of cylindrical side frame members 2 ₁ to 2 _n and 2 ₁ to 2 on both sides. portal ladder arranged in a plurality of vertical stages are formed in a gate shape in stepping crosspiece 3 ₁ to 3 _n are laterally placed between _n and both side frame members 2 ₁ to 2 _n, 2 ₁ to 2 _n of the upper portion in telescopic ladder fitted comprising were what member 1 ₁ to 1 _n side members 2 ₁ to 2 _n of the telescopically,
Portal ladder members 1 ₁ to 1 _n which are adjacent to each other when the ladder is contracted 11 ₁ to 1 _n step bars 3 _{1 to} 3 _{n In} order to prevent the operator's fingers from being packed, the step bars 3 ₁ to 3 It is characterized in that an interval holding means 6 for holding an interval S between 3 _n is provided.

In a second aspect of the present invention, in the telescopic ladder according to the first aspect, the distance holding means 6 is a stepping step that is fitted and fixed to the upper ends of the side frame members 2 ₁ to 2 _{n of the} portal ladder members 1 ₁ to 1 _n. Extend the upper or lower part of the short pipe member 4 ₁ to 4 _{n by} the required length upward or downward so that the space S between the step bars 3 _{1 to} 3 _n necessary to prevent finger filling is secured. It consists of the extension pipe part 7 formed by doing.

According to a third aspect of the present invention, in the telescopic ladder according to the first aspect, the distance holding means 6 is a stepping step fitted and fixed to the upper end portions of the side frame members 2 ₁ to 2 _{n of the} portal ladder members ₁₁ to 1 _n. as one end to the short tube member 4 ₁ to 4 _n lower or upper end for with桟取contacts a respective side members 2 ₁ to 2 fitted to _n together are shock-absorbing ring 15 ₁ to 15 _n, pinched fingers ring width so that the distance S between the tread crosspiece 3 ₁ to 3 _n required for prevention is secured, characterized in that it consists expanded cushioning rings 15 ₁ to 15 _n.

The effect of the invention by the above-described solution means will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, when the ladder contracts, the portal ladder members 1 ₁ to 1 _n adjacent to each other vertically stepping crosspiece 3 ₁ to 3 _n to prevent the pack operator's fingers between stepping required for its pinched fingers prevent flying bridge 3 ₁ to 3 _n each portal apart holding means 6 for holding the spacing S between each other Since the ladder members 1 ₁ to 1 _n are provided, when the ladder A is folded from the extended state to the contracted state and the contraction operation is performed, the fingers of the operator are placed between the step bars 3 _{1 to} 3 _n adjacent to each other vertically. And the folding contraction work can be performed safely.

According to the second aspect of the present invention, the distance holding means 6 is a short pipe for mounting a stepping bar that is fitted and fixed to the upper end portions of the side frame members 2 ₁ to 2 _{n of the} portal ladder members 1 ₁ to 1 _n. member 4 ₁ to 4 _n extension pipe portion 7 the upper end portion or a lower end portion formed by extending by a required length upward or downward so that the distance S of桟間stepping necessary pinched fingers prevention is assured of since consisting stepping the short pipe member 4 ₁ to 4 _n during fabrication for with桟取because may be extended to the required length above the upper end of the short pipe member 4 ₁ to 4 _n for with each stepping桟取, manufacture It becomes easy.

According to the invention of claim 3, the interval holding means 6, a short pipe with stepping桟取fitted and secured to each side frame member 2 ₁ to 2 _n upper ends of the portal ladder member 1 ₁ to 1 _n member 4 a ₁ to 4 _n lower end or upper end cushioning ring 15 ₁ to 15 _n which are fitted to each side frame member 2 ₁ to 2 _n to end contact, crosspiece stepping necessary pinched fingers prevent According to what spacing S between 3 ₁ to 3 _n is from the expanded cushioning rings 15 ₁ to 15 _n of the ring width to be ensured, the expansion of the ring width to stretch ladder used conventionally since the impact may be attached relaxing ring 15 ₁ to 15 _n has an advantage of a conventional telescopic ladder available as it is.

A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a telescopic ladder A according to the present invention in a contracted state, and FIG. FIG, (b) is an arrow Y enlarged view of a portion indicated by, 3 second to 4 th portal ladder member 1 part of _{2-1 4} from the bottom for example telescopic ladder a in the contraction state of (a) It is an expanded sectional view.

In this telescopic ladder A, as in the conventional telescopic ladder B shown in FIGS. 6 and 7, each of the portal ladder members 1 ₁ to 1 _n includes a pair of cylindrical side frame members 2 ₁ to 2 _n and 2 _1. to 2 _n and, made of the linked stepping crosspiece 3 ₁ to 3 _n laterally placed on the upper end of each side frame member _{2 1 ~2 n, 2 1 ~2} n, both ends of each stepping bar 3 ₁ to 3 _n Are integrally connected to the short beam members 4 ₁ to 4 _n for attaching the step bars, which are fitted and fixed to the upper ends of the two side frame members 2 ₁ to 2 _n and 2 ₁ to 2 _n , respectively. On the lower end side of the short pipe members 4 ₁ to 4 _n for mounting the rails, a rubber shock buffer is used to reduce the shock when the short pipe members 4 ₁ to 4 _n adjacent to each other hit the top and bottom when the ladder contracts. The rings 5 _{1 to} 5 _n are fitted and attached to the side frame members 2 ₁ to 2 _n .

And this telescopic ladder A is different from the conventional telescopic ladder B in that the operator's fingers are packed between the stepped bars 3 _{1 to} 3 _{n of the} portal ladder members 11 ₁ to 1 _n adjacent to each other when the ladder is contracted. In order to prevent this, the gate-type ladder members 11 ₁ to 1 _n are provided with the interval holding means 6 for maintaining the interval S between the step bars 3 _{1 to} 3 _n necessary for preventing the finger padding.

As shown in FIG. 3, each interval holding means 6 is a short pipe member 4 for attaching a tread bar that is fitted and fixed to the upper ends of the side frame members 4 ₁ to 4 _{n of the} portal ladder members ₁₁ to 1 _{n. It} consists of an extension pipe portion 7 formed by extending the upper ends of ₁ to 4 _n upward by a required length δ so as to ensure the spacing S between the treads necessary for preventing finger filling. In this case, the distance S between the step bars 3 _{1 to} 3 _n necessary for preventing finger filling is about 15 mm. Accordingly, the ring width w (axial length) of each of the impact mitigating rings 5 _{1 to} 5 _n is set to 4 mm, and the upper ends of the short bar members 4 ₁ to 4 _n (excluding the extension pipe portion 7) for attaching the tread bars If the distance η with respect to the upper ends of the step bars 3 _{1 to} 3 _n is 2 mm, the axial length η of the extension pipe portion 6 is 15 mm−4 mm−2 mm = 9 mm.

Each gate-shaped ladder member 1 ₁ to 1 _n has both the end of each step bar 3 _{1 to} 3 _n and the same as the conventional telescopic ladder B. An interval holding means 6 is provided for holding the crosspieces at a constant interval. Since this stopper means 9 has the same structure as the conventional telescopic ladder B described in FIG. 7, the same reference numerals as those of the conventional ladder B shown in FIG.

According to the telescopic ladder A according to the present invention having the above-described configuration, the operator's fingers are packed between the stepping bars 3 _{1 to} 3 _{n of the} portal ladder members ₁₁ to 1 _n adjacent to each other when the ladder contracts. In order to prevent this, the gate-type ladder members 1 ₁ to 1 _n are provided with interval holding means 6 for maintaining the distance S between the step bars 3 _{1 to} 3 _n necessary for preventing finger filling, for example, 15 mm. When the ladder A is folded from the extended state (see FIG. 6 (a)) to the contracted state (see FIG. 6 (b)), the ladders 3 _{1 to} 3 _n adjacent to each other in the vertical direction are mutually connected. The operator's fingers are not sandwiched between them, and the folding and contracting work can be performed safely.

4 (a) is a front view showing the contracted state of the improved telescopic ladder A according to the present invention, (b) is a front view showing the contracted state of the conventional telescopic ladder B, and (a) and (b) are shown. As can be seen from comparison, the improved telescopic ladder A is slightly higher in height than the conventional telescopic ladder B in the contracted state, but the step bars 3 _{1 to} 3 _{n of the} portal ladder members ₁₁ to 1 _n adjacent to each other in the vertical direction. Since the gap is held at the gap S necessary for preventing finger filling by the gap holding means 6, the operator's fingers are not caught.

As shown in FIGS. 2 and 3, the gap holding means 6 is a short tread bar mounting short that is fitted and fixed to the upper end portions of the side frame members 2 ₁ to 2 _{n of the} portal ladder members 1 ₁ to 1 _n. formed by the upper end portion or a lower end portion of the tubular member 4 ₁ to 4 _n is extended by the required length upward or downward as the spacing S between the tread crosspiece 3 ₁ to 3 _n required pinched fingers prevented is ensured 3. When the ladder is contracted, as shown in FIG. 3, a short pipe member for attaching a stepping bar to upper ladder members 11 ₁ to 1 _n adjacent to each other in the vertical direction when the ladder is contracted. The impact mitigating rings 5 _{1 to} 5 _n attached to the lower ends of 4 ₁ to 4 _n come into contact with the extension pipe portion 7 at the upper end of the short beam member 4 ₁ to 4 _n of the lower ladder member. and state will have, Thus the spacing S between the stepping vertically adjacent crosspiece 3 ₁ to 3 _n mutually from 15mm about a wide, enable pinched fingers proof It can be.

When such consist extension pipe portion 7 which is formed by extending the upper end of the short pipe member 4 ₁ to 4 _n for the stepping with桟取interval holding means 6 by a required length upwardly, for with stepping桟取When the short pipe members 4 ₁ to 4 _n are manufactured, the upper ends of the short pipe members 4 ₁ to 4 _n for attaching the tread bars only need to be extended upward by a required length, so that the manufacture becomes easy. Incidentally, the extension pipe unit 7 may be formed by extending by a required length of the lower end of the short pipe member 4 ₁ to 4 _n for with each stepping桟取downward.

In the embodiment shown in FIGS. 1 to 3, each interval holding means 6, with stepping桟取fitted and secured to each side frame member 2 ₁ to 2 _n upper ends of the portal ladder member 1 ₁ to 1 _n The upper end portions (or lower end portions) of the short tube members 4 ₁ to 4 _n are formed to extend upward (or downward) by a required length so as to ensure the space S between the tread bars necessary for preventing finger filling. However, as shown in FIG. 5, the other gap holding means 6 is provided at the upper end of each side frame member 2 ₁ to 2 _{n of} each of the portal ladder members 1 ₁ to _1. met each side frame member 2 ₁ a fitted are cushioning in to 2 _n ring 15 ₁ to 15 _n as one end is in contact with the lower end of the fitting fixed is depressed桟取short pipe member 4 ₁ to 4 _n for w Te, (shows an expanded ring width W) of the ring width to the spacing S between桟間stepping necessary pinched fingers prevention is secured is expanded cushioning ring 15 ₁ It may consist of ˜15 _n . The撃緩sum ring 15 ₁ to 15 _n may be one fitted to each side frame member 2 ₁ to 2 _n as one end is in contact with the upper end of the short pipe member 4 ₁ to 4 _n for w桟取stepping.

In the case of the ladder A shown in FIG. 5, the distance S between the step bars 3 _{1 to} 3 _n necessary for preventing finger jamming is set to 15 mm, and the upper ends of the short pipe members 4 ₁ to 4 _n for each step bar and the respective step bars If the distance η with respect to the upper ends of 3 _{1 to} 3 _n is 2 mm, the expanded ring width W of each of the impact relaxation rings 15 ₁ to 15 _n is 15 mm−2 mm = 13 mm.

Interval holding means 6 in this manner, each portal ladder member 1 ₁ to 1 _n each side frame member 2 ₁ to 2 _n upper end portion to the fitting fixed to the tread short pipe member 4 ₁ to 4 _n for w桟取of a lower or upper end cushioning ring 15 ₁ to 15 _n which are fitted to each side frame member 2 ₁ to 2 _n as an end in contact, stepping necessary pinched fingers prevent crosspiece 3 ₁ between to 3 _n According to the structure comprising the impact relaxation rings 15 ₁ to 15 _n whose ring width is expanded so as to ensure the space S, the impact relaxation ring 15 whose ring width is expanded to the conventionally used telescopic ladder. since it may be attached to ₁ to 15 _n, can be used a conventional telescopic ladder as it is.

It is a front view which shows the expansion-contraction ladder A which concerns on this invention in a contracted state. (a) is the XX sectional drawing of FIG. 1, (b) is an enlarged view of the part shown by the arrow Y of (a). FIG. _{4 is} a partially enlarged cross-sectional view of members 1 ₂ to 14, for example, the second to fourth portal ladders from the bottom of the telescopic ladder A in the contracted state. (a) is a front view which shows the contraction state of the improved expansion-contraction ladder A which concerns on this invention, (b) is a front view which shows the contraction state of the conventional expansion-contraction ladder B. It is sectional drawing similar to FIG. 3 which shows other embodiment of the space | interval holding means. (a) is a perspective view showing a conventional aluminum telescopic ladder B in an expanded state, and (b) is a perspective view showing the telescopic ladder B in a contracted state. Is a partially enlarged cross-sectional view from below eg telescopic ladder B in a contracted state the second to 4 th portal ladder member 1 _{2-1 4.}

Explanation of symbols

A Improved telescopic ladder of the present invention B Conventional telescopic ladder 1 ₁ to 1 _n Gate-shaped ladder member 2 ₁ to 2 _n Side frame member 3 _{1 to} 3 _n Step bar 4 ₁ to 4 _n Short pipe member finger for mounting the step bar Packing 5 _{1 to} 5 _n Impact mitigating ring 6 Interval holding means 7 Extension pipe portion 9 of short pipe member for stepping bar attachment Stopper means 15 ₁ to 15 _n Impact mitigating ring

Claims (3)

Nested side frame members of a portal ladder member that is formed in a gate shape with a pair of cylindrical side frame members on both sides and a step bar that is placed between the upper ends of both side frame members and arranged in multiple stages above and below. In the telescopic ladder that is fitted to
In order to prevent clogging of the operator's fingers between the steps of the portal ladder members that are adjacent to each other when the ladder is contracted, an interval holding means for holding the interval between the steps is required. Telescopic ladder characterized by.   Spacing means secures the space between the tread bars necessary to prevent finger jamming at the upper or lower end of the short pipe member for mounting the tread bar that is fitted and fixed to the upper end of each side frame member of each portal ladder member 2. The telescopic ladder according to claim 1, further comprising an extension pipe portion formed by extending a predetermined length upward or downward. The interval holding means is an impact that is fitted to each side frame member so that one end is in contact with the lower end or the upper end of the short pipe member for mounting the stepping bar that is fitted and fixed to the upper end portion of each side frame member of each portal ladder member. The telescopic ladder according to claim 1, wherein the telescopic ladder is a shock-reducing ring, wherein the shock-reducing ring has an expanded ring width so as to ensure a space between the treads necessary for preventing finger jamming.

Images