JP3130003U - Ladder fall prevention device - Google Patents

Abstract

[PROBLEMS] To provide a simple structure with a small number of parts and excellent mass productivity, and can be easily and reliably attached to an arbitrary height of an existing ladder post, and is excellent in mounting workability, reliability, and versatility. The ladder can be securely locked to the target object to prevent it from falling, and it is safe and can be easily removed or folded when not in use, which can be bulky when transporting or storing the ladder. Providing ladder fall prevention tools that are easy to handle.
A ladder overturn prevention device that is detachably disposed on a ladder that is used by leaning the back portions of the left and right columns on the corners of the top plate of the object, and which is one of the left and right columns of the ladder. A locking member having a base that contacts one back surface, a contact portion that extends to the base and that contacts and locks the top surface of the top plate of the object, and the base of the locking member is fixed to the column. And a fixing portion.
[Selection] Figure 1

Description

  The present invention relates to a ladder overturn prevention device that is detachably attached to an existing ladder column and prevents the ladder from overturning.

2. Description of the Related Art Conventionally, various studies have been made on a ladder falling prevention tool that is mounted on a ladder column and prevents the falling of the ladder and a ladder that includes the falling prevention tool.
For example, in (Patent Document 1), an arm that moves up and down along a column and rotates only in one direction is attached to one or both of a pair of columns that constitute a ladder, and the movement of the arm is associated with an arbitrary position. There is disclosed a ladder with a safety device characterized by having means for stopping.
In addition, (Patent Document 2) discloses a ladder characterized in that a fixing tool that is fixed to a member that leans the ladder on a support is attached.
Further, in (Patent Document 3) and (Patent Document 4), an anti-slip portion of an elastic body is provided on one side of an aluminum strip, and a post mounting bracket is provided on both sides of the other side of the aluminum strip. An anti-skid device for a ladder that is attached in a direction perpendicular to the column post or in a direction parallel to the ladder column is disclosed.
JP-A-52-138266 Japanese Utility Model Publication No. 02-72800 Japanese Utility Model Publication No. 04-127400 Japanese Utility Model Publication No. 01-132198

However, the above conventional technique has the following problems.
(1) (Patent Document 1) is a ladder in which a safety device is previously incorporated, and an arm moves up and down along a support column and rotates in one direction. Therefore, the structure is complicated and lacks mass productivity. At the same time, it cannot be attached to an existing ladder, and has a problem that it lacks versatility and handling.
(2) (Patent Document 2) is an arm (fixing tool) that is rotatably supported by a support column, and a nail projecting from the free end of the arm is driven and fixed to the upper end surface of a hook with a hammer or the like. Therefore, the fixing work is complicated, and the objects on which the ladder is leaned are limited, and there is a problem that the versatility and the handling are lacking.
(3) (Patent Document 3) and (Patent Document 4) are to press an anti-slip portion of an elastic body provided on one side of a flat aluminum strip against the corner of an object, and friction of the anti-slip portion. Since the fall is prevented only by the force, there is a problem that the fixing stability is lacking, the anti-slip portion is easily damaged due to wear or the like, and the durability and long life are lacking.
In addition, the structure of the metal fitting for supporting the column is complicated and lacks in mass productivity, the mounting work to the column is complicated, and there is a problem that the attaching / detaching workability to the ladder and the handling property are insufficient.

  The present invention solves the above-mentioned conventional problems, has a simple structure, has a small number of parts, is excellent in mass productivity, and can be easily and reliably attached to any height of the existing ladder column, mounting workability, Excellent in reliability and versatility, can securely lock the ladder to objects such as switchboards to prevent falling, and is excellent in safety, and can be easily removed or folded when not in use. An object of the present invention is to provide a ladder overturn prevention device which is not bulky when the ladder is transported or stored and has excellent handleability.

In order to solve the above conventional problems, the ladder overturn prevention device of the present invention has the following configuration.
The ladder overturn prevention device according to claim 1 of the present invention is a ladder overturn prevention device that is detachably disposed on a ladder that is used by leaning the back portions of the left and right posts on the corners of the top plate portion of the object. A base portion that contacts the back surface of one of the left and right columns of the ladder, and a contact portion that extends from the base portion and contacts and locks against the top surface of the top plate portion of the object. And a fixing portion that fixes the base portion of the locking member to the support column.
With this configuration, the following effects can be obtained.
(1) A locking member having a base that abuts on the back of one of the left and right pillars of the ladder, and an abutment that extends to the base and abuts on the top surface of the top plate of the object. And a fixing portion for fixing the base of the locking member to the support column, the contact of the locking member when the back surface of the ladder support unit is stood against the corner of the top plate portion of the object. The ladder can be fixed by locking the portion to the top plate portion of the object, and the ladder can be reliably prevented from sliding down or overturning, and the ladder can be stably fixed and can be reliably prevented from falling.
(2) Since it has a fixing part for fixing the base of the locking member to the support column, it can be easily and firmly fixed to the existing support column, and it can be easily attached according to the height of the ceiling of the object. It can be changed and has excellent versatility.
(3) Since the support and the locking member can be easily attached / detached by the fixing portion, they can be easily removed when not in use, and are not bulky at the time of transporting or storing the ladder, and are excellent in handleability.

Here, as a material of the locking member and the fixing portion, in addition to a metal such as stainless steel, chrome steel, steel, cast steel, cast iron, carbon steel, aluminum alloy, carbon fiber, boron fiber, glass fiber, metal fiber, etc. Those formed by molding with organic or inorganic fibers and synthetic resin are preferably used. In the case of a metal, a rust-proofed one is preferred because of its excellent handling properties.
The base portion and the contact portion of the locking member can be formed in a flat plate shape or a substantially U-shaped cross section. By forming the cross section of the base part and the contact part into a substantially U-shaped cross section, or by arranging ribs at important points to reinforce, the rigidity and durability of the entire locking member can be improved, It is possible to reduce the weight by reducing the thickness of the base portion and the contact portion.

The ladder overturn prevention device may be attached to only one of the left and right pillars of the ladder, or may be attached to the left and right pillars in pairs. In particular, when it is mounted on the left and right columns, the fixing stability can be improved, and the rollover of the ladder can be prevented more reliably. If a sufficient contact area can be ensured by, for example, forming the contact portion of the locking member wide, it is only necessary to attach one ladder fall prevention tool to either one of the left and right columns of the ladder. Almost the same fixing stability can be obtained.
The angle formed by the base portion of the locking member and the contact portion is preferably set to 100 degrees to 110 degrees. As a result, when the ladder is leaned against the object, the angle formed by the ground contact surface and the support of the ladder is 70 degrees to 80 degrees, which is excellent in stability when the ladder is raised and lowered or when working on the ladder.

  The fixing portion may be any member that can fix the base portion of the locking member to the support column of the ladder. However, a fixing portion that is fixed by sandwiching the support column between the fixing portion and the base portion is preferably used. In particular, those fixed with screws are easy to attach and detach, and can be firmly fixed, so that the workability is excellent.

Invention of Claim 2 is the ladder fall prevention tool of Claim 1, Comprising: The said fixing | fixed part has the structure provided with the clamping part which clamps the said support | pillar between the said base parts. .
With this configuration, in addition to the operation obtained in the first aspect, the following operation can be obtained.
(1) Since the fixing portion has a holding portion that holds the support column with the base portion, the interval between the base portion and the holding portion can be easily adjusted, regardless of the shape of the support column or the thickness of the member. It can be fixed securely and has excellent versatility and fixing stability.

Here, the clamping unit may sandwich the entire support column or a part of the support column. In particular, when the ladder support is formed in a substantially U-shaped cross section, it is firmly fixed by being clamped between the base disposed on the back surface and the clamping portion disposed on the U-shaped opening. It can be used and has excellent fixation stability.
The clamping part may be formed in a flat plate shape. However, if an engagement convex part that engages with the column is provided on the contact surface side with the column, the clamping force of the clamping unit can be reliably transmitted to the column. It is excellent in fixing stability. In particular, in the case where there are irregularities or steps in the column, it is possible to avoid the irregularities and steps and fix the engagement convex part in contact with the flat part of the column, which is excellent in versatility and fixing reliability. In addition, as an engaging convex part, a pin-shaped protrusion may be formed in the important point, and a convex line | wire of desired length etc. may be formed.

The invention according to claim 3 is the ladder overturn prevention device according to claim 2, wherein the fixing portion is formed in a fixing screw inserted into a fixing hole drilled in the base portion, and the clamping portion. And a female screw portion to which the fixing screw is screwed.
With this configuration, in addition to the operation obtained in the second aspect, the following operation can be obtained.
(1) The fixing portion has a fixing screw inserted through a fixing hole drilled in the base portion and a female screw portion formed in the clamping portion and screwed into the fixing screw, so that the fixing screw can be loosened or tightened. It is possible to easily adjust the distance between the base portion and the sandwiching portion by simply attaching the locking member to the support column.

  Here, by disposing the fixing screws at least at two locations in the longitudinal direction of the base portion, the struts can be tightened evenly and firmly at the holding portion, and the fixing stability of the base portion is excellent. In addition, when the fixing screw is a wing screw, it can be easily attached and detached manually without using a tool such as a screwdriver, and is excellent in workability.

Invention of Claim 4 is the ladder fall prevention tool of Claim 2 or 3, Comprising: The surface of the said clamping part side of the said base part of the said locking member, or the said base part of the said clamping part of the said fixing part And a support protrusion that projects from at least one of the side surfaces and comes into contact with the base side surface of the clamping part or the base side surface of the clamping part.
With this configuration, in addition to the operation obtained in the second or third aspect, the following operation can be obtained.
(1) A base-side surface of the clamping part or a base-side surface of the clamping part that protrudes from at least one of the base-side surface of the locking member and the base-side surface of the fixing part By having the supporting projections that come into contact with the pin, it is possible to prevent the pinching part from coming into contact with each other, the clamping force of the pinching part can be reliably and uniformly transmitted to the column, and the fixing stability can be improved.

  Here, as the support protrusion, a pin-like protrusion may be formed at a key point, or a protrusion having a desired length may be formed. In particular, when the sandwiching portion has an engagement convex portion, when the engagement convex portion comes into contact with the support column, the support protrusion is high so that it comes into contact with the base-side surface of the sandwiching portion or the base-side sandwiching portion-side surface. If the thickness is set, the base portion and the sandwiching portion are substantially parallel to each other, and can be securely and firmly fixed, and the fixing stability is excellent.

The invention according to claim 5 is the ladder overturn prevention device according to any one of claims 2 to 4, wherein the locking member protrudes from a surface of the base portion on the side of the clamping portion. It has the structure provided with the support | pillar guide part contact | abutted to the outer surface of the said support | pillar.
With this configuration, in addition to the action obtained in any one of claims 2 to 4, the following action is obtained.
(1) Since the locking member has a column guide portion that protrudes from the surface of the base portion on the clamping portion side and abuts on the outer surface of the column, tilting of the locking member with respect to the column and displacement in the left-right direction can be prevented. The contact portion of the locking member can be reliably brought into surface contact with the upper surface of the top plate portion of the object, and the fall prevention reliability is excellent.

  Here, the support | pillar guide part should just contact | abut on the outer surface of a support | pillar, and can be positioned. For example, it may be formed as pin-like protrusions at least at two locations in the longitudinal direction of the base portion, or may be formed on a convex line so as to be in surface contact with the outer side surface of the support column.

Invention of Claim 6 is the ladder fall prevention tool of any one of Claims 1 thru | or 5, Comprising: The said base parts of the said locking member fixed to each of the said right and left support | pillars, or It has the structure provided with the connection part which connects at least any one of the said contact parts of the said locking member fixed to the said right and left support | pillar.
With this configuration, in addition to the action obtained in any one of claims 1 to 5, the following action is obtained.
(1) By having a connecting portion that connects at least one of the base portions of the locking members fixed to the left and right support columns or the contact portions of the locking members fixed to the left and right support columns, The locking member fixed to each of the pillars can be handled in an integrated manner, and when it is mounted not in the upper end of the ladder but in the middle, the right and left height adjustment is unnecessary, and the workability and handleability are excellent.

  Here, the connecting portion may be formed integrally with the locking member in advance, or may be formed integrally with another member formed by welding or screwing.

Invention of Claim 7 is the ladder fall prevention tool of any one of Claim 1 thru | or 6, Comprising: The said locking member contact | abuts the upper surface of the said top-plate part of the said target object. It has the structure provided with the elastic member stuck on the contact surface of the said contact part.
With this configuration, in addition to the action obtained in any one of claims 1 to 6, the following action is obtained.
(1) Since the locking member has an elastic member attached to the contact surface of the contact portion that contacts the upper surface of the top plate portion of the object, the contact portion of the locking member and the top of the object The plate part is not in direct contact, and it is possible to reliably prevent the top plate part from being scratched or the paint on the top plate part from being peeled off, and the handleability is excellent.
(2) Due to the friction of the elastic member attached to the contact surface of the contact portion, the ladder can be prevented from slipping or rotating in a horizontal plane, and the fixing stability is excellent.

  Here, as a material of the elastic member, synthetic rubber such as chloroprene rubber, styrene-butadiene rubber, and nitrile rubber, or synthetic resin such as polyethylene, polypropylene, polyurethane, urea resin, and cross-linked polyethylene is preferably used.

The invention according to claim 8 is the ladder overturn prevention device according to any one of claims 1 to 7, wherein the base portion and the contact portion of the locking member are rotatably held. It has the structure provided with the rotation support part.
With this configuration, in addition to the action obtained in any one of claims 1 to 7, the following action is obtained.
(1) By having a rotation support portion that rotatably holds the base portion and the contact portion of the locking member, the contact portion can be folded with respect to the base portion when not in use, and the ladder can be transported or stored. Since it does not become bulky sometimes, it is not necessary to remove the locking member from the support column, and the handleability is excellent.

  Here, a hinge etc. are used suitably as a rotation support part. When the stopper portion is provided so that the angle formed by the base portion and the contact portion does not open more than a predetermined angle when the contact portion of the locking member is locked to the top plate portion of the object, the ladder is provided. Can be surely prevented, and has excellent fixing stability. As the stopper portion, one that extends from the upper end side of the base portion and contacts the upper surface of the contact portion is preferably used. Moreover, the same effect | action is acquired also when an inclined stopper part is formed in each edge part so that the end surfaces of a base part and a contact part may engage at a predetermined angle.

As described above, according to the ladder overturn prevention device of the present invention, the following advantageous effects can be obtained.
According to the device of the first aspect, the following advantageous effects can be obtained.
(1) Since the locking member has a base that abuts on the back surface of the ladder column and a contact portion that extends to the base, the base of the locking member is detachably fixed to the column by the fixing unit. When the back of the ladder column is used while leaning against the corner of the top plate of the object, the abutment part of the locking member is locked to the top plate of the object. It is possible to provide a ladder overturn prevention device that can be fixed and that can reliably prevent the ladder from sliding down or overturning, and has excellent ladder fixing stability and fall prevention reliability.
(2) Since the support and the locking member can be easily attached / detached by the fixing portion, the attachment position can be changed or removed when not in use, depending on the height of the ceiling of the object. It is possible to provide a ladder overturn prevention device which is not bulky when the ladder is transported or stored, and has excellent versatility and handling.

According to the invention described in claim 2, in addition to the effect described in claim 1, the following advantageous effects can be obtained.
(1) By simply adjusting the distance between the base and the clamping part, the locking member can be securely fixed to the column regardless of the shape of the column and the thickness of the member. A ladder overturn prevention device can be provided.

According to the invention described in claim 3, in addition to the effect described in claim 2, the following advantageous effects can be obtained.
(1) By simply screwing the fixing screw inserted into the fixing hole of the base portion into the female screw portion of the holding portion, the supporting member can be fixed to the supporting post by holding the supporting post between the base portion and the holding portion. It is possible to easily adjust the distance between the base portion and the sandwiching portion according to the amount, and to provide a ladder overturn prevention tool excellent in workability and versatility that can easily attach and detach the locking member to the support column. it can.

According to the invention described in claim 4, in addition to the effect described in claim 2 or 3, the following advantageous effect can be obtained.
(1) Holding the support protrusion projectingly provided on at least one of the surface on the clamping portion side of the base portion of the locking member or the surface on the base side of the clamping portion of the fixing portion, or clamping the surface on the base side of the clamping portion or the base portion The ladder overturn prevention tool with excellent fixing stability that can prevent the clamping part from hitting one side by contacting the part side surface, and can securely and uniformly transmit the clamping force of the clamping part to the column. Can be provided.

According to the invention described in claim 5, in addition to the effect described in any one of claims 2 to 4, the following advantageous effects can be obtained.
(1) By making the column guide portion projecting from the surface on the clamping portion side of the base portion of the locking member abut on the outer surface of the column, it is possible to prevent the locking member from tilting with respect to the column and the horizontal displacement. In addition, it is possible to provide a ladder overturn prevention tool excellent in fall prevention reliability that can reliably bring the contact portion of the locking member into surface contact with the upper surface of the top plate portion of the object.

According to the invention described in claim 6, in addition to the effect described in any one of claims 1 to 5, the following advantageous effects can be obtained.
(1) Two members fixed to each of the left and right columns by connecting at least one of the bases of the locking members fixed to each of the left and right columns or the contact parts by a connecting unit. The stop member can be handled in an integrated manner, and it is possible to provide a ladder overturn prevention tool that is superior in workability and handleability because it is not necessary to adjust the left and right heights when mounted in the middle of the ladder instead of the upper end. .

According to the invention described in claim 7, in addition to the effect described in any one of claims 1 to 6, the following advantageous effects can be obtained.
(1) Since the elastic member is attached to the contact surface of the contact portion of the locking member, the contact portion of the locking member and the top plate portion of the object do not directly contact each other, and the top plate portion No scratches or peeling of the top plate paint, excellent handleability, and excellent fixing stability that can reliably prevent ladder slipping or rotation in a horizontal plane by friction of elastic members A ladder fall prevention device can be provided.

According to the invention described in claim 8, in addition to the effect described in any one of claims 1 to 7, the following advantageous effects can be obtained.
(1) Since the base portion and the contact portion of the locking member are rotatably held by the rotation support portion, the contact portion can be folded with respect to the base portion when not in use. It is not bulky at the time of conveyance or storage, and it is not necessary to remove the locking member from the support column, and it is possible to provide a ladder overturn prevention tool with excellent handleability.

Hereinafter, a ladder overturn prevention device according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a main part perspective view showing a use state of a ladder provided with a ladder overturn prevention device in the first embodiment.
In FIG. 1, 1a and 1b are symmetrically formed, and the ladder overturn prevention device in the first embodiment, which is detachably arranged in pairs on the left and right support columns 16a and 16b of the ladder 15, 2 is substantially L-shaped. Locking members of the ladder overturn prevention devices 1a and 1b formed in the mold, 3 is a base portion of the locking member 2 that comes into contact with one of the back portions 17b of the left and right support columns 16a and 16b of the ladder 15, and 4 is a base portion 3 Are attached to the contact surfaces of the base 3 and the contact portion 4. The contact portions 5 of the locking member 2 are attached to the top surface 22 of the top plate 22 of the object 20 such as a distribution board and locked. The fixed elastic member of the locking member 2, 6 is a fixing part of the ladder overturning prevention tools 1 a and 1 b for fixing the base 3 of the locking member 2 to the left and right columns 16 a and 16 b, and 15 is the back of the left and right columns 16 a and 16 b. Ladder 16a, 16 which uses part 17b leaning on corner 22a of top plate part 22 of subject 20, Is the left and right columns of the ladder 15 formed in a lip groove shape, 17a is the outer surface of the columns 16a and 16b, 17b is the back surface of the columns 16a and 16b, 17c is the front surface of the columns 16a and 16b, and 17d is the column 16a, Lips formed at the end portions of the back surface portion 17b and the front surface portion 17c of 16b, 17e is an inner surface of the back surface portion of the columns 16a and 16b, 18 is a stepping rail for the ladder 15 provided between the left and right columns 16a and 16b, Reference numeral 21 denotes a peripheral wall portion of the object 20.

Next, details of the ladder overturn prevention tool will be described.
FIG. 2A is a plan view of the ladder overturn prevention tool in the first embodiment, FIG. 2B is a side view of the ladder overturn prevention tool in the first embodiment, and FIG. It is a principal part sectional top view which shows the attachment state to the support | pillar of a ladder fall prevention tool.
Since the ladder overturn prevention devices 1a and 1b in Embodiment 1 used in pairs are symmetrical, the ladder overturn prevention device 1b will be described.
In FIG. 2, reference numeral 5 a denotes a notch portion of the elastic member 5 formed so as to avoid a head 8 a of a fixing screw 8 to be described later, and 7 denotes a fixing portion for sandwiching the back surface portion 17 b of the columns 16 a and 16 b with the base portion 3. Reference numeral 6 denotes a clamping portion, 7 b is an engaging convex portion that protrudes at two locations on the base 3 side surface of the clamping portion 7 and engages with the back surface inner surface 17 e (see FIG. 3) of the support column 16 b, and 8 denotes the base 3. The fixing screw of the fixing portion 6 inserted into the fixing hole 3a and screwed into the female screw portion 7a formed in the holding portion 7, 8a is the head of the fixing screw 8, and 9 is the surface of the base 3 on the holding portion 7 side. Pin-shaped support protrusions 10 projecting at two upper and lower portions and abutting on the surface of the sandwiching portion 7 on the base 3 side, and 10 are projecting at two locations on the upper and lower surfaces of the sandwiching portion 7 side of the base 3 and are external surfaces of the support columns 16b It is a support | pillar guide part contact | abutted to 17a (refer FIG. 3).

As a material of the locking member 2 and the fixing portion 6, in addition to a metal such as stainless steel, chrome steel, steel, cast steel, cast iron, carbon steel, aluminum alloy, carbon fiber, boron fiber, glass fiber, metal fiber, etc. The one molded with organic or inorganic fibers and synthetic resin can be used.
As a material of the elastic member 5, synthetic rubber such as chloroprene rubber, styrene-butadiene rubber, nitrile rubber, or synthetic resin such as polyethylene, polypropylene, polyurethane, urea resin, cross-linked polyethylene, or the like can be used.

A method of using the ladder overturn prevention tool according to Embodiment 1 configured as described above will be described.
FIG. 4 is a side view of an essential part showing a use state of the ladder provided with the ladder overturn prevention device in the first embodiment.
First, as shown in FIG. 2, the fixing screw 8 of the fixing part 6 is loosened to widen the distance between the base part 3 and the clamping part 7, and then the back part 17b of the column 16b of the ladder 15 is inserted therebetween. At this time, the column guide portion 10 is brought into contact with the outer side surface 17a of the column 16b, thereby preventing the locking member 2 from being inclined with respect to the column 16b and the lateral displacement.
Next, by tightening the fixing screw 8, the distance between the base portion 3 and the sandwiching portion 7 is narrowed, and as shown in FIG. 3, the engaging convex portion 7b of the sandwiching portion 7 is engaged with the back surface inner surface 17e of the column 16b. At the same time, the support protrusion 9 of the base 3 abuts against the surface of the clamping part 7 on the base 3 side, and the ladder overturn prevention tool 1b is fixed to the support 16b.
Similarly, the ladder overturn prevention device 1a is also fixed to the column 16a.

By providing the engagement convex portion 7b that engages the back surface inner surface 17e of the support column 16b on the surface of the fixed portion 6 on the base portion 3 side of the support portion 7, the clamping force of the support portion 7 is reliably transmitted to the support column 16b. It is excellent in fixing stability. In particular, it is possible to avoid the lip 17d formed on the end portion of the back surface portion 17b of the support column 16b and fix the engagement convex portion 7b by contacting the flat portion of the back surface inner surface 17e of the support column 16b. Excellent fixing reliability. The height is set so that the support protrusion 9 comes into contact with the surface on the base 3 side of the sandwiching portion 7 when the engagement convex portion 7b comes into contact with the back surface inner surface 17e of the support column 16b. The clamping part 7 becomes substantially parallel, can be fixed securely and firmly, and is excellent in fixing stability.
In addition, by disposing the fixing screws 8 at two positions above and below in the longitudinal direction of the base portion 3, the back portion 17 b of the support column 16 b can be tightened evenly and firmly by the sandwiching portion 7, and the fixing stability of the base portion 3 is excellent.

As shown in FIG. 1, when the ladder 15 to which the ladder overturn prevention devices 1a and 1b are mounted as described above is leaned against the corner portion 22a of the top plate portion 22 of the object 20, the abutment of the locking member 2 occurs. The portion 4 is brought into surface contact with the top surface of the top plate portion 22 and is locked and fixed.
In FIG. 4, α is an angle formed by the contact portion 4 of the locking member 2 of the ladder overturn prevention device 1 a and the column 16 a of the ladder 15, and this angle α is formed by the ground plane and the columns 16 a and 16 b of the ladder 15. Equal to the corner. By setting the angle α to 70 to 80 degrees, the stability when the ladder 15 is raised and lowered or when working on the ladder 15 is excellent.

In the present embodiment, the ladder fall prevention tools 1a and 1b are mounted in pairs on the left and right support columns 16a and 16b, respectively, thereby improving the fixing stability of the ladder 15 and ensuring that the ladder 15 rolls over. However, the ladder overturn prevention devices 1a and 1b may be attached to only one of the left and right support columns 16a and 16b of the ladder 15. In this case, when at least the width of the contact portion 4 is increased, the stability is excellent due to friction.
Moreover, in this Embodiment, although the engagement convex part 7b, the support protrusion part 9, and the support | pillar guide part 10 were arrange | positioned at two places up and down as a pin-shaped protrusion, these shapes and arrangement | positioning are not limited to this. And can be selected as appropriate. Note that the same effect can be obtained by projecting the support protrusion 9 on the surface of the base 3 on the side of the sandwiching part 7 instead of projecting on the surface of the base 3 on the side of the base 3.

As described above, since the ladder overturn prevention device according to Embodiment 1 is configured, the following operation is obtained.
(1) The base 3 that abuts on the back surface portion 17b of either one of the left and right columns 16a and 16b of the ladder 15 and the top surface of the top 20 of the object 20 that is extended to the base 3 and locked. Since the locking member 2 having the contact portion 4 and the fixing portion 6 for fixing the base 3 of the locking member 2 to the support columns 16a and 16b are provided, the back surface portion 17b of the support columns 16a and 16b of the ladder 15 is targeted. When leaning on the corner portion 22a of the top plate portion 22 of the object 20, the abutment portion 4 of the locking member 2 can be locked to the top plate portion 22 of the object 20 to fix the ladder 15. Thus, the ladder 15 can be reliably prevented from slipping or side-sliding, and the ladder 15 can be fixed stably and has excellent reliability in preventing overturning.
(2) Since the fixing portion 6 for fixing the base portion 3 of the locking member 2 to the support columns 16a and 16b is provided, it can be easily and firmly fixed to the existing support columns 16a and 16b, and the ceiling portion 22 of the object 20 is obtained. The mounting position can be easily changed according to the height of the lens, which is highly versatile.
(3) Since the columns 16a and 16b and the locking member 2 can be easily attached and detached by the fixing portion 6, they can be easily removed when not in use, and are not bulky when the ladder 15 is transported or stored. (4) Since the fixing portion 6 has the holding portion 7 that holds the support columns 16a and 16b between the fixing portion 6 and the base portion 3, the interval between the base portion 3 and the holding portion 7 can be easily adjusted. Regardless of the shape of the columns 16a and 16b and the thickness of the members, the columns 16a and 16b can be reliably fixed, and are excellent in versatility and fixing stability.
(5) The fixing portion 6 has a fixing screw 8 inserted through the fixing hole 3a drilled in the base portion 3 and a female screw portion 7a formed in the holding portion 7 and screwed with the fixing screw 8. By simply loosening or tightening the fixing screw 8, the distance between the base portion 3 and the clamping portion 7 can be adjusted easily, and the locking member 2 can be easily attached to and detached from the support columns 16a and 16b.
(6) By having the support protrusion 9 that protrudes from the surface of the base 3 of the locking member 2 on the side of the sandwiching part 7 and contacts the surface of the base of the sandwiching part 7 on the side of the base 3, The clamping force of the clamping part 7 can be reliably and uniformly transmitted to the columns 16a and 16b, and the fixing stability can be improved.
(7) Since the locking member 2 has the column guide portion 10 that protrudes from the surface of the base portion 3 on the side of the sandwiching portion 7 and contacts the outer surface 17a of the columns 16a and 16b, the locking member for the columns 16a and 16b 2 can be prevented, and the abutting portion 4 of the locking member 2 can be reliably brought into surface contact with the upper surface of the top plate portion 22 of the object 20, and the fall prevention reliability is excellent. .
(8) Since the locking member 2 has the elastic member 5 attached to the contact surface of the contact portion 4 that contacts the upper surface of the top plate portion 22 of the object 20, the contact of the lock member 2 The top plate portion 22 of the object 4 and the top plate portion 22 of the object 20 are not in direct contact with each other, and the top plate portion 22 can be reliably prevented from being scratched or the coating of the top plate portion 22 being peeled off.
(9) By the friction of the elastic member 5 attached to the contact surface of the contact portion 4, the ladder 15 can be prevented from slipping or rotating in a horizontal plane, and the fixing stability is excellent.

(Embodiment 2)
FIG. 5 (a) is a side view of the ladder overturn prevention device according to the second embodiment, and FIG. 5 (b) is a side view showing a folded state of the ladder overturn prevention device according to the second embodiment. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
In FIG. 5, the ladder overturn prevention device 1c in the second embodiment is different from the first embodiment in that the base portion 3 and the contact portion 4 of the locking member 2a are rotatable by a rotation support portion 11 using a hinge. It is a point that is held in. Reference numeral 3b denotes a stopper portion that extends to the upper end side of the base portion 3 and abuts against the upper surface of the contact portion 4 when in use, thereby preventing the angle between the base portion 3 and the contact portion 4 from opening beyond a predetermined angle. It is.
The stopper portion 3b may be any one that can prevent the angle between the base portion 3 and the contact portion 4 from opening more than a predetermined angle, so that the end portions of the base portion 3 and the contact portion 4 are engaged with each other at a predetermined angle. In addition, when the inclined stopper portion is formed, the same action can be obtained.

As described above, since the ladder overturn prevention device according to the second embodiment is configured, in addition to the same operation as that of the first embodiment, the following operation can be obtained.
(1) By having the rotation support portion 11 that rotatably holds the base portion 3 and the contact portion 4 of the locking member 2a, the contact portion 4 can be folded with respect to the base portion 3 when not in use. Since the ladder 15 is not bulky when the ladder 15 is transported or stored, it is not necessary to remove the locking member 2a from the support columns 16a and 16b, and the handleability is excellent.

(Embodiment 3)
FIG. 6A is a perspective view of the ladder overturn prevention device according to Embodiment 3, and FIG. 6B is a cross-sectional view taken along line AA in FIG. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
In FIG. 6, the ladder overturn prevention device 1 d in the third embodiment is different from the first embodiment in that ribs 3 c and 4 a protrude from both sides of the base portion 3 and the contact portion 4 of the locking member 2 b, respectively. Is formed in a substantially U-shape, a point having a protrusion engaging projection 7c formed integrally by bending one side portion of the holding portion 7, and a fixing screw 8 having a butterfly shape. This is a point having a head 8b. The ribs 3c on both sides of the base part 3 reinforce the base part 3, and can also serve as the support projection part 9 and the column guide part 10 in the first embodiment, thereby reducing the number of parts and the number of manufacturing steps, thereby achieving mass productivity. Excellent.
Moreover, since the head 8b of the fixing screw 8 has a butterfly shape, it can be easily attached and detached manually without using a tool such as a screwdriver, and is excellent in workability.

As described above, since the ladder overturn prevention device according to the third embodiment is configured, in addition to the same operation as that of the first embodiment, the following operation can be obtained.
(1) The ribs 3c and 4a are disposed on both sides of the base 3 and the abutting part 4, and the rigidity and durability of the entire locking member 2b are improved by reinforcing the section by forming a substantially U-shaped cross section. It is possible to reduce the thickness of the base portion 3 and the contact portion 4 to reduce the weight, and the handleability is excellent.

(Embodiment 4)
FIG. 7 is a perspective view of a ladder overturn prevention device in the fourth embodiment. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
In FIG. 7, the ladder overturn prevention device 1e in the fourth embodiment is different from the first embodiment in that the base portions 3 of the two locking members 2 fixed to the left and right support columns 16a and 16b are connected to each other. This is a point having a part 12.
In the present embodiment, only the base portions 3 of the locking member 2 are connected by the connecting portion 12, but only the contact portions 4 may be connected, or both the base portions 3 and the contact portions 4 may be connected. You may connect.

As described above, since the ladder overturn prevention device in the fourth embodiment is configured, in addition to the same operation as in the first embodiment, the following operation can be obtained.
(1) At least one of the base portions 3 of the locking members 2 fixed to the left and right support columns 16a and 16b or the contact portions 4 of the locking members 2 fixed to the left and right support columns 16a and 16b. By having the connecting portion 12 to be connected, the locking member 2 fixed to each of the left and right support columns 16a, 16b can be handled in an integrated manner. When mounting the tool 1e, it is not necessary to adjust the left and right heights and is excellent in workability and handling.

(Embodiment 5)
FIG. 8 is a perspective view of the ladder overturn prevention device in the fifth embodiment. In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
In FIG. 8, the ladder overturn prevention device 1 f in the fifth embodiment is different from that in the first embodiment in that the contact portion 4 of the base portion 2 c is extended to a length substantially equal to the width of the ladder 15. It has a portion 4b and is attached only to the right column 16b.
In addition, the shape and arrangement | positioning of the extension part 4b are not limited to this, What is necessary is just to be able to ensure sufficient contact area. Moreover, the same effect | action is acquired even if it forms the contact part 4 wide instead of providing the extended part 4b.
Further, in the present embodiment, the ladder overturn prevention device 1f is mounted on the right column 16b, but the same may be applied to the left column 16a that is formed symmetrically with the ladder overturn prevention device 1f.

As described above, since the ladder overturn prevention device according to the fifth embodiment is configured, in addition to the same operation as that of the first embodiment, the following operation can be obtained.
(1) By forming the extending portion 4b on the contact portion 4 of the locking member 2c to ensure a sufficient contact area, one ladder fall prevention tool 1f can be attached to the left and right support columns 16a, 16b of the ladder 15. By simply attaching to either one of the ladders, the stability of fixing the same as when the ladder overturning prevention tools 1a and 1b are respectively attached to the left and right columns 16a and 16b of the ladder 15 can be obtained.

  The present invention has a simple structure, few parts, excellent mass productivity, can be easily and securely attached to any height of existing ladder supports, has excellent workability and versatility, and has a ladder on the object. Can be securely locked to prevent overturning, has excellent reliability, can be easily removed and folded when not in use, and is not bulky when transporting or storing the ladder, making it easy to handle An excellent ladder overturn prevention tool can be provided, and the stability of work on the ladder can be improved.

The principal part perspective view which shows the use condition of the ladder provided with the ladder fall prevention tool in Embodiment 1. FIG. (A) Top view of the ladder overturn prevention tool in Embodiment 1 (b) Side view of the ladder overturn prevention tool in Embodiment 1 (A) Schematic front view showing the initial state of the filter paper feeding mechanism in the first embodiment (b) Schematic front view showing the filter paper feeding state of the filter paper feeding mechanism in the first embodiment (c) Filter paper feeding in the first embodiment Schematic front view showing the winding state of the filter paper of the mechanism The principal part side view which shows the use condition of the ladder provided with the ladder fall prevention tool in Embodiment 1 (A) Side view of the ladder overturn prevention device in Embodiment 2 (b) Side view showing the folded state of the ladder overturn prevention device in Embodiment 2 (A) Perspective view of ladder overturn prevention device in embodiment 3 (b) AA cross-sectional view taken along line AA in FIG. 6 (a) The perspective view of the ladder fall prevention tool in Embodiment 4 The perspective view of the ladder fall prevention tool in Embodiment 5

Explanation of symbols

1a, 1b, 1c, 1d, 1e, 1f Ladder overturn prevention tool 2 Locking member 3 Base part 3a Fixing hole 3b Stopper part 3c, 4a Rib 4 Contact part 4b Extension part 5 Elastic member 5a Notch part 6 Fixing part 7 Clamping part 7a Female thread part 7b Engaging convex part 8 Fixing screw 8a, 8b Head part 9 Support projection part 10 Supporting part 11 Rotating support part 12 Connection part 15 Ladder 16a, 16b Posting part 17a Outer side surface 17b Rear surface part 17c Front part 17d Lip 17e Back side inner surface 18 Step rail 20 Target object 21 Peripheral wall part 22 Top plate part 22a Corner part

Claims (10)

A ladder overturn prevention device that is detachably disposed on a ladder that is used by leaning the back surfaces of the left and right pillars against the corners of the top plate portion of the object, the one of the left and right pillars of the ladder A locking member having a base that is in contact with the back surface and a contact portion that is extended to the base and is locked in contact with the top surface of the top plate portion of the object; and A ladder overturn prevention device comprising: a fixing portion that fixes a base portion. The ladder overturn prevention tool according to claim 1, wherein the fixing portion includes a clamping portion that clamps the support column with the base portion. The ladder overturn prevention tool according to claim 2, wherein the fixing portion includes an interval adjusting portion that adjusts an interval between the base portion and the clamping portion. 4. The ladder according to claim 2, wherein the locking member includes a stopper portion that protrudes from a surface of the base portion on the holding portion side and contacts the surface of the holding portion on the base portion side. Fall prevention tool. 4. The ladder overturn according to claim 2, wherein the fixing portion includes a stopper portion that protrudes from a surface of the clamping portion on the base portion side and abuts on a surface of the base portion on the clamping portion side. Prevention tool. 6. The device according to claim 2, wherein the locking member includes a displacement prevention portion that protrudes from a surface of the base portion on the side of the clamping portion and contacts an outer surface of the support column. The ladder overturn prevention device described in 1. The said fixing | fixed part was provided with the engagement convex part protrudingly provided on the surface of the said base part side of the said clamping part, and engaging with the said support | pillar, The inside of any one of Claim 2 thru | or 6 characterized by the above-mentioned. Ladder fall prevention device The base connecting portion that connects between the base of the locking member fixed to the left column and the base of the locking member fixed to the right column. The ladder overturn prevention tool according to any one of 1 to 7. A contact portion connecting portion that connects between the contact portion of the locking member fixed to the left column and the contact portion of the locking member fixed to the right column; The ladder overturn prevention tool according to any one of claims 1 to 8, characterized in that: The said locking member is provided with the elastic member stuck on the contact surface of the said contact part contact | abutted on the said upper surface of the said top-plate part of the said object, The inside of Claim 1 thru | or 9 characterized by the above-mentioned. The ladder overturn prevention tool according to any one of claims.

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