JP2007031981A - Overturn preventing apparatus for ladder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose an overturn preventing apparatus for surely supporting the upper end of a long size ladder used for roof work. <P>SOLUTION: This overturn preventing apparatus has a base board 10 installed on the ladder L via a fixing means and a movable plate 20 slidably installed on the base board. While arranging a bending part 22 capable of abutting on an edge upper surface of a roof in an upper end part of the movable plate, a vertical hole 11 is arranged in the base board, and a horizontal hole 27 is arranged in the movable plate. The movable plate is fixed to the base board so that an angle can be adjusted by inserting a screw into the vertical hole and the horizontal hole. The base board 10 is fixed in an upper part of the ladder L, and the edge upper surface of the roof is pressed down by the movable plate 20 sliding to the base board so that the angle can be adjusted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an instrument that prevents a ladder from falling over.

  Since there are many ladders, especially aluminum ladders, which are lightweight and can be freely stretched, they are used for various roof constructions. However, because of its light weight, it is easy for a ladder to fall over when weight is applied upward or when there is weight shift.

For this reason, various proposals have been made to prevent the ladder from falling over. For example, Japanese Patent Application Laid-Open No. 2005-139812 or Japanese Patent Application Laid-Open No. 2003-013682 proposes an instrument that prevents a fall by supporting the lower end portion of a ladder.
JP-A-2005-139812 JP2003-013682A

  The problem is that, in the case of a long aluminum ladder used for roof construction or the like, if an instrument for preventing the fall is arranged at the lower end of the ladder, the instrument tends to be large.

  A fall accident in a long aluminum ladder used for roof construction is likely to occur at the time of weight load or weight transfer when an operator gets off the ladder, but as in the inventions of Patent Document 1 and Patent Document 2 described above. In addition, in the structure where the fall prevention device is arranged at the lower end of the ladder, the upper end of the ladder may swing, so the worker feels fear psychologically and considering the moment of force, It is difficult to obtain sufficient stability unless the supporting equipment is considerably enlarged.

  SUMMARY OF THE INVENTION An object of the present invention is to propose a tipping prevention device that can reliably support the upper end of a long ladder used for roof construction or the like.

  In order to achieve the above object, a ladder overturn prevention device according to the present invention includes a board mounted on a ladder via a fixing means, and a movable plate slidably attached to the board, and is provided at the upper end of the movable plate. A bent part that can contact the upper surface of the edge of the roof is provided, while a vertical hole is provided in the substrate, a horizontal hole is provided in the movable plate, and a screw is inserted into the vertical hole and the horizontal hole, thereby moving relative to the substrate. The plate is fixed so that the angle can be adjusted (Claim 1).

  According to such a configuration, the upper surface of the edge of the roof can be suppressed by the movable plate that fixes the substrate to the upper portion of the ladder and slides with respect to the substrate so that the angle can be adjusted. By adjusting the angle of the movable plate that suppresses the top edge of the roof edge according to the position of the ladder relative to the roof slope and the angle of the roof, it can be moved regardless of whether the ladder is placed on the wife surface or on the windbreak surface. The board holds the top edge of the roof from above.

  In this case, the upper surface of the end edge of the roof and the roof has contact resistance due to the contact of the bent portion of the movable plate and prevents the ladder from falling over. When it is necessary to further improve the properties, it is desirable to employ appropriate fixing support means. The fixing support means may be provided in the fall prevention device as in claim 2, or a plurality of magnets are fixed to the metal plate of the roof, and the magnet and the fall prevention device are connected with a string, a metal wire or the like. You may contact us via

  According to a second aspect of the present invention, the state of connection between the fall-preventing device and the roof is improved, and a pair of left and right fixed support portions that support the edge of the roof from below are arranged on the fall-preventing device.

  According to this configuration, not only the pressing of the upper surface of the roof edge by the bent portion of the movable plate whose angle can be adjusted, but also sandwiching the edge of the roof via the fixed support portion, the fall prevention device and the roof The state of connection or connection (fixed state) can be strengthened. By providing the fixed support portions as a pair of left and right, it is possible to improve the balance stability of the upper portion of the ladder.

  According to a third aspect of the present invention, a pair of left and right fixed support portions sandwiching the edge of the roof is provided as a screw member having a substantially J-shaped side surface or a substantially L-shaped side surface at the bent portion at the top of the movable plate.

  The structure of the fixing support portion described in claim 2 is not particularly limited. However, in order to reduce the cost in the simplest manner, a screw member having a substantially J-shaped side surface or a substantially L-shaped side surface is used, and the tip of the screw member is used. This is because it is preferable to suppress the lower surface of the edge of the roof.

  In claim 3, the screw member having a substantially J-shaped side surface or a substantially L-shaped side surface is arranged on the movable plate, but a pair of left and right fixed support portions sandwiching the edge of the roof together with the bent portion. Since it is arranged in the fall prevention device (claim 2), it is needless to say that it may be arranged on the substrate side.

  According to the fall-preventing device according to the present invention, after fixing the substrate to the upper part of the ladder, the movable plate is adjusted by sliding, and the upper surface of the edge of the roof is firmly held from above using the bent portion, thereby the ladder. The wobble can be prevented. It is desirable to arrange an elastic resin such as rubber on the back surface of the bent portion in order to increase resistance. It can also prevent damage to the edge of the roof.

  FIG. 1 illustrates a ladder overturn prevention device according to the present invention. This overturn prevention device is constituted by a substrate 10 fixed to an upper portion of a ladder, for example, an aluminum ladder L, and a movable plate 20 slidably fixed to the substrate 10, and a bent portion 22 provided on the upper portion of the movable plate 20. The upper surface of the edge of the roof R is suppressed from above.

  The substrate 10 is fixed to, for example, the back surface side of the leaning aluminum ladder L, and the movable plate 20 is disposed on the inner side (roof side) of the substrate 10. Incidentally, when the aluminum ladder L is stood on the flat side of the roof R, it is not necessary to incline the movable plate 20 with respect to the substrate 10 as shown in FIG. However, when the aluminum ladder L is stood on the side of the roof R for the convenience of construction, the movable plate 20 is inclined with respect to the substrate 10 as shown in FIG.

  FIG. 4 exemplifies specific shapes of the substrate 10 and the movable plate 20. The substrate 10 and the movable plate 20 are preferably formed using a light rust-resistant metal such as aluminum or a hard resin that is hard to rust.

  The substrate 10 fixed to the aluminum ladder L is formed so as to exhibit, for example, a horizontally long substantially rectangular shape. The lateral width is at least a dimension equal to or greater than the lateral width of the aluminum ladder L so that it can be fixed to the left and right vertical members of the aluminum ladder L.

  It is desirable that the movable plate 20 is also shaped so as to exhibit a horizontally long substantially rectangular shape like the substrate 10. The left-right width of the movable plate 20 may be smaller than that of the substrate 10. However, in order to enhance the functionality of suppressing the upper surface of the edge of the roof R from above, it is preferably set to be equal to or greater than the left-right width of the substrate 10. This is because the gripping force that increases the area of the bent portion 22 and suppresses the upper surface of the edge of the roof R from above is increased.

  The board 10 is provided with screw holes 19 for fixing to the vertical members of the aluminum ladder L on the left and right, and a pair of left and right vertical holes 11 are provided at positions inside the screw holes 19. Since the screw hole 19 is for driving a screw into the vertical member of the aluminum ladder L, the separation distance is set according to the width of the vertical member of the aluminum ladder L.

  The pair of left and right vertical holes 11 provided in the substrate 10 is for allowing the movable plate 20 to move in the vertical direction. Since the vertical movement distance of the movable plate 20 is normally 3 to 8 cm, it can be practically used. Therefore, the vertical dimension of the vertical hole 11 is, for example, 5 to 10 cm with a slight margin.

  On the other hand, the movable plate 20 is provided with a pair of left and right lateral holes 27 corresponding to the longitudinal holes 11 of the substrate 10. This is because a screw (for example, a thumbscrew) 28 is inserted into the vertical hole 11 of the substrate 10 and the horizontal hole 27 of the movable plate 20 to fix the movable plate 20 to the substrate 10 so that the angle can be adjusted.

  Since the substrate 10 has the vertical holes 11, the movable plate 20 can move in the vertical direction with respect to the substrate 10, and the movable plate 20 has the lateral holes 27, so that the movable plate 20 is in contact with the substrate 10. Thus, the inclination angle of the movable plate 20 can be freely set and fixed via the screw 28.

  The vertical holes 11 are provided in the substrate 10 and the horizontal holes 27 are provided in the movable plate 20. When the movable plate 20 is inclined in accordance with the inclination of the roof R, a pair of left and right screws for fixing the substrate 10 and the movable plate 20 are provided. This is because the separation distance of 28 changes. If the screw hole (27) of the movable plate 20 is a circular hole, the variation in the distance of the screw 28 accompanying the inclination of the movable plate 20 cannot be absorbed. On the other hand, if the movable plate 20 is provided with a lateral hole 27, the movable plate 20 can be adjusted to a preferred angle, and even if there is a slight error in the mounting position of the substrate 10, the error is absorbed and bent. The upper surface of the edge of the roof R can be suppressed without gaps by the portion 22. The dimension in the longitudinal direction of the lateral hole 27 is preferably about 5 cm, for example. Further, in order to prevent damage to the metal plate of the roof R due to the contact between the movable plate 20 and the edge of the roof R, rubber or It is desirable to provide a cushion material 29 such as a foamed resin material.

  It is desirable to increase the ability of the bent portion 22 to increase the left and right dimensions as much as possible to suppress the edge of the roof R. For this reason, in this embodiment, the three bending parts 22 are provided in the center and right and left. The central bent portion 22 (C) located inside the vertical member of the aluminum ladder L has the largest left-right width, and the left and right bent portions 22 (R), 22 ( L) has a smaller left-right width than that. This is because the left and right dimensions of the movable plate 20 are made compact and high grip performance is ensured by three-point support. The concave portion V between the central bent portion 22 (C) and the left and right bent portions 22 (R) and 22 (L) contributes to weight reduction of the fall prevention device.

  The bending angle of the bent portion 22 in the front-rear direction is set in accordance with the angle of an inclined roof such as a gable (for example, 20 to 40 degrees). The inclination angle of the roof is not unclear because it follows the amount of snowfall and the traditional style, but the angle of the bent portion 22 with respect to the general surface of the movable plate 20 is, for example, 20 to 35 degrees.

  In this embodiment, in order to increase the contact strength between the movable plate 20 and the edge of the roof R, the left and right bent portions 22 (R) and 22 (L) are provided with substantially J-shaped screw members 30, The lower surface of the edge of the roof R is suppressed at the tip. If the contact area of the bent portion 22 is sufficiently large, such a screw member 30 may not be necessary. However, in order to reliably prevent the aluminum ladder L from shaking with a simple structure, it is effective to support the roof R from below using the screw member 30. If the roof R is a tin roof, for example, a strong magnet or the like can be used to connect the fall prevention device and the roof R, but there are times when it is difficult to use the magnet, such as during snowfall. It is desirable to firmly connect the fall prevention device and the roof R using the L-shaped screw member 30.

  Therefore, according to such a fall-preventing device, after fixing the substrate 10 to the aluminum ladder L with screws or the like, the movable plate 20 is slid up and down, and when necessary, the movable plate 20 is inclined in accordance with the inclination of the roof R. By setting the angle and tightening the screw 28 to fix the movable plate 20, the upper part of the aluminum ladder L and the roof R are in close communication, and the swinging movement of the aluminum ladder L is suppressed and the occurrence of a fall accident is prevented. I can do it.

  Since the substrate 10 includes the vertical holes 11 and the movable plate 20 includes the horizontal holes 27, the movable plate 20 has a free angle adjustment function, and the back surface of the bent portion 22 fits the upper surface of the edge of the roof R, The left and right swinging movement of the upper part of the aluminum ladder L is surely prevented.

  The fall prevention device according to the present invention is not limited to the above embodiment. For example, the shapes of the substrate 10 and the movable plate 20 are not necessarily rectangular. When the board 10 is fixed to the aluminum ladder L, not only screwing, but, for example, a holder member that holds the vertical member of the aluminum ladder L, a flange or a horizontal member that is fixed to the horizontal member of the aluminum ladder L, is held. A holder member or the like may be used.

  The vertical hole 11 provided in the substrate 10 and the horizontal hole 27 provided in the movable plate 20 do not need to be a pair of left and right. For example, even if only one vertical hole (11) and one horizontal hole (27) are provided at the central portion, as long as a screw with high tightening strength is used, functions such as angle adjustment of the movable plate 20 can be achieved. The bending part 22 provided in the upper part of the movable plate 20 does not have a recessed part (V), and is good also as a structure continuous on either side.

  The fixed support portion that supports the edge of the roof R from below is not limited to a J-shaped screw or an L-shaped screw. For example, as shown in FIG. 5, a vertical hole 40 may be provided on both sides of the movable plate 20, and a support member 48 constituted by a thumbscrew 41 and a support plate 43 may be disposed in the vertical hole 40. The support member 48 supports the edge of the roof R from below by the bent portion 44 of the support plate 43. Reference numeral 42 denotes a leg portion of the thumbscrew. The leg portion 42 is screwed so as to be able to advance and retreat, for example, through substantially the center of the support plate 43.

  Compared with the case where the J-shaped or L-shaped screw member 30 is arranged in the bent portion 22 of the movable plate 20, when the vertical holes 40 are provided on both sides of the movable plate 20 and the support plate 43 is fixed, the end of the roof R Since it is not necessary to insert a screw into the bent portion 22 of the movable plate 20 that suppresses the upper edge, the working efficiency required for screwing is increased. Moreover, since the area of the bending part 44 of the support plate 43 can be designed large, the effect of the downward support of the edge of the roof R can be enhanced, and the effect of preventing the aluminum ladder L from falling can be improved. In addition, since a fixed support part should just support the lower surface of the edge of a roof, it is good also as a clip structure integrated with the bending part which suppresses the upper surface of a roof.

It is a figure which illustrates the attachment state of the fall prevention device concerning the present invention from the side. It is a figure which illustrates the case where the fall prevention instrument concerning the present invention is arranged on the flat side. It is a figure which illustrates the case where the fall prevention instrument concerning the present invention is arranged on the wife side. It is a figure which illustrates the board | substrate and movable plate which concern on this invention. It is a figure which shows other embodiment of the fixed support part which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Board | substrate 11 Vertical hole 19 Screw hole 20 Movable plate 22 Bending part 27 Horizontal hole 28 Screw 29 Cushion material 30 Screw member (fixed support part)
40 vertical hole 41 thumbscrew 42 thumbscrew leg 43 support plate 44 bent portion of support plate L aluminum ladder R roof

Claims (3)

A board to be attached to the ladder via fixing means;
This board is equipped with a movable plate slidably attached,
While the upper end of the movable plate is provided with a bent portion that can contact the upper surface of the edge of the roof,
A vertical hole is provided in the substrate and a horizontal hole is provided in the movable plate. Screws are inserted into the vertical hole and the horizontal hole, and the movable plate is fixed to the substrate so that the angle can be adjusted. Instruments.   The ladder overturn prevention device according to claim 1, further comprising a pair of left and right fixed support portions for supporting the edge of the roof from below. The fixed support part
Attach a screw member having a substantially J-shaped side surface or a substantially L-shaped side surface to the bent portion at the top of the movable plate
3. The ladder overturn prevention device according to claim 2, wherein the lower surface of the edge of the roof is suppressed by the tip of the screw member while the upper surface of the edge of the roof is suppressed by the bent portion.

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