JPH065515Y2 - Ladder - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a ladder provided on a wall surface of a manhole, a quay wall or other general buildings and used for elevating.

(Prior Art) A ladder used for lifting a manhole or the like is mainly made of iron, and as shown in FIGS. 7 and 8, upper and lower end portions of the inner wall and bottom of the stackable side block 2 of the manhole 1. Are attached along the inner surface of the side block 2 by being embedded therein. The ladder 3 is a pair of columns 4 made of round bars.
And a plurality of footrests 5 each made of a round bar whose ends are welded to and integrated with the column 4. This ladder 3 was easy to manufacture and construct, low in cost, strong at the time of installation, and widely used.

(Problems to be solved by the invention) Although the above-mentioned conventional ladder is easy to manufacture and construct, the corrosive gas in the manhole causes the corrosion of the ladder 3 to progress quickly, resulting in poor durability and poor durability. There was a problem. Also, the humidity in the manhole is high and the ladder 3
The footrest 5 made of a round bar is slippery, and although the pillar 4 is grasped by hand, the shoes slip on the footrest 5 when the foot is put on the footrest 5, and the shoe tends to fall when going up and down. There is a problem that the corroded portion of the hanging portion 5 is scraped off to further accelerate the corrosion of the corroded portion and further deteriorate the durability.

The object of the present invention is to solve the above-mentioned problems by forming the entire ladder with a synthetic resin mainly composed of fiber reinforced plastic, and by providing a non-slip on the foot part to make it easier to move up and down and the durability of the ladder. To provide an improved ladder.

(Means for Solving Problems) Therefore, according to the present invention, a rod-shaped footrest member having a thermoplastic material coated on the outer circumference of a core member is provided between two parallel fiber-reinforced plastic columns. In the ladder arranged by opening, a protrusion extending in the axial direction is formed on the outer periphery of the end portion of the footrest member, and a hole matching the end portion of the footrest member is formed in the strut, The side surface and the end portion of the footrest member are provided with a retaining hole for inserting a pin so that the pin penetrates the footrest member at a right angle, and the end portion of the footrest member is formed in the hole of the column. And the pin is inserted into the column and the footrest member.

(Operation) Therefore, the pillar and the footrest member have good corrosion resistance due to the property of plastic, and the anti-slip projections and finger wave lines can be formed on the footrest member. In addition, the protrusions and pins formed at the ends of the footrest members prevent the footrest members from rotating and falling off, and the protrusions can increase the end rigidity and firmly fix the footrest members.

(Embodiment) The present invention will be described below with reference to FIGS. 1 to 6.

As shown in FIGS. 1 and 2, side block blocks 11, 1
Insert the end of the upper end support member 18 of the ladder 17 into the ladder assembly hole 16 formed in the side block 14 located at the top of the manhole 15 formed by stacking 2, 13, and 14, The grip anchor 19 is fitted to the end portion of the upper end support member 18 from the outer peripheral side of the side block 14 to prevent slipping off,
Stand vertically from the bottom surface 20 of the manhole 15.

As shown in FIGS. 1 to 4, the pair of columns 21 of the ladder 17 are made of fiber reinforced plastic in the shape of an elongated rectangular tube in the axial direction, and the columns 21 have a pair of columns 21, 21 facing each other. From this, a hole 21a penetrating to the opposite side and a retaining hole 21b that is orthogonal to the axis of the hole 21a in the horizontal plane are formed. A long hole 21c is formed in the upper end portion of the support column 21 so that the pair of support columns 21, 21 penetrates from the opposite side to the opposite side, and has a length exceeding the position where the long hole 21c is provided from the upper end. Cap 22 formed into a rectangular tube shape
To fit. The cap 22 is provided with a long hole 23 having a position and a size that are substantially the same as those of the long hole 21c. Prop 2
The cap 22 is fitted on the upper end of the
21c and 23 are aligned with each other, and the upper end supporting member 18 having a substantially U-shaped planar shape is inserted into the elongated holes 21c and 23 that are overlapped at the same position up to the central straight line portion of the upper end supporting member 18. A water drainage hole 24 is bored on the side surface of the lower end of the support column 21, and a lower cap 25 is provided on the lower end of the support column 21 to make the support column 21 stand upright on the bottom surface of the manhole.

As shown in FIGS. 4 to 6, the foot portion of the ladder 17 is
It is formed by detachably attaching a plurality of footrest members 26 between the pair of columns 21. The foot member 26 is a substantially linear rod, and a round rod 26a serving as a core material made of fiber reinforced plastic having fibers arranged in the longitudinal direction is arranged at the center, and the outer peripheral portion is made of a thermoplastic such as polypropylene. It is covered and formed into a predetermined shape. The upper and lower surfaces of the central portion of the footrest member 26 are, as shown in FIG. 5, a footrest surface 28 that is substantially flat and has a non-slip projection 27 formed thereon. Further, on the footrest surface 28, in addition to the anti-slip protrusions 27, a reflector plate 29 in which a diamond prism reflector is formed in the shape of a small disc is disposed near both ends of the footrest surface 28. The shape of the non-slip protrusions 27 is illustrated as being approximately X-shaped, but the shape is not limited to this, and it is possible to prevent slipping in multiple directions such as a cross shape, and moreover, soil etc. does not remain inside the pattern. Is desirable. Further, the reflecting plate 29 is not limited to the small circular plate shape, but may have another shape.
An appropriate size can be selected.

As shown in FIGS. 4 and 5, on the surface of the footrest member 26 located on the wall surface side of the manhole in the center thereof, as shown in FIGS. To form.

As shown in FIGS. 4 and 6, the end portion of the footrest member 26 has a round cross section, and axially extending ridges 31, 31 are provided at opposing positions on the outer circumference of the end portion. A pair of columns 21, 21
It is a fitting part for. The protrusion 31 is a detent when it is fitted into the column 21. Alternatively, the end may be formed in a polygonal column shape and fitted into a hole that fits the end to serve as a detent. A retaining hole 32 is formed at a position corresponding to the retaining hole 21b of the column 21 at a portion of the end of the footrest member 26 which is fitted to the column 21.

As shown in FIG. 4, the pair of support columns 21, 21 of the ladder 17 and the plurality of footrest members 26 are inserted into the holes 21a into which the ends of the footrest members 26 are fitted, and the retaining holes 21b of the support columns 21 are formed. It is fixed integrally by driving the retaining pin 33 across the retaining hole 32 of the footrest member 26.

When such an embodiment is used, the reflecting plate 29 can reflect the light when moving up and down, and the position of the footrest member 26 can be confirmed. The hand can be firmly gripped in the axial direction of the hanging member 26 without slipping, and when the foot is put on the foot surface 28 of the foot member 26, the anti-slip projection 27 can surely ascend and descend the foot without slipping. Become.

Therefore, in this embodiment, the entire ladder 17 can be formed of a non-metallic material to improve the corrosion resistance and reduce the weight, and the support column 21 and the footrest member 26 can be easily connected by the retaining pin 33. The external force for rotating 26 can be dispersed in the ridges 31, and the footrest member 26 is firmly connected. Further, at the time of transportation, it can be disassembled by pulling out the retaining pin 33, so that the work is easy. Further, the foot member 26 has a fiber-reinforced plastic core material (round bar 26a) whose outer periphery is covered with thermoplastic to easily form a plurality of shapes such as the anti-slip protrusion 27 and the finger wave line 30. In addition to making it easy to hold by hand, it is possible to prevent slippage of the foot, and also to make it possible to confirm the position of the footrest member by disposing the reflection plate 29, thereby facilitating the lifting and lowering of the ladder. be able to.

(Effect of the Invention) As described above, according to the present invention, the ladder is formed mainly of plastic to improve the durability, and the pillar and the foot member of the ladder can be easily disassembled and assembled by the retaining pin, and can be transported. To make it easier. Further, it becomes easy to form the anti-slip projections and the finger wave lines on the surface of the footrest member, and it is possible to prevent the footrest surface from slipping and prevent the foot from slipping off when moving up and down. Further, with respect to the external force applied at the time of stepping off, the end portion of the footrest member has a high rigidity due to the projecting shape, which reduces damage to the ladder and improves durability.

[Brief description of drawings]

1 is a longitudinal sectional view showing a state where the ladder according to the present invention is installed in a manhole, FIG. 2 is a front view showing a state where the ladder according to the present invention is installed in a manhole, and FIG. 3 is according to the present invention. FIG. 4 is a partially enlarged side view showing an upper end portion (III in FIG. 1) of the ladder, and FIG. 4 is a partially enlarged plan sectional view showing an assembly portion (IV in FIG. 2) of the handrail and the footrest member according to the present invention, 5 is a cross-sectional view of the footrest member taken along the line VV of FIG. 4, FIG. 6 is a cross-sectional view of the footrest member taken along the line VI-VI of FIG. 4, and FIG. FIG. 8 is a vertical cross-sectional explanatory view showing the ladder installed in the manhole, and FIG. 8 is a front explanatory view showing the ladder installed in the conventional manhole. 17 ... Ladder, 18 ... Upper end support member 19 ... Grip anchor, 21 ... Strut 21a ... Hole, 21b ... Stop hole 21c ... Slot, 22 ... Cap 23 ... Slot, 26 ... Footrest member 26a …… Round bar, 27 …… Slip prevention protrusion 28 …… Footrest surface, 29 …… Reflector plate 30 …… Finger wave line 32 …… Prevention hole, 33 …… Prevention pin

Claims (1)

[Scope of utility model registration request] 1. A ladder in which rod-shaped footrest members coated with thermoplastic around the outer periphery of a core material are arranged at intervals between two fiber-reinforced plastic struts arranged in parallel. A protrusion extending in the axial direction is formed on the outer periphery of the end of the column, and a hole is formed in the strut to match the end of the footrest member, and the side surface of the strut and the end of the footrest member are
A retaining hole through which a pin is inserted is formed so that the pin penetrates the footrest member at right angles, the end of the footrest member is inserted into the hole of the column, and the pin is inserted into the column and the column. A ladder characterized by being inserted into a foot rest member.