JP2017193891A - Slip prevention tool for ladder, and ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip prevention tool for a ladder and a ladder that may be held stably on a roof side.SOLUTION: A slip prevention tool for a ladder includes a base member 2, a fulcrum pin 3 provided on the base member 2, a load transmission member 4 provided rotatably on the fulcrum pin 3, and pressing members 5, 5 provided on the load transmission member 4. The base member 2 has a base plate part 21 fixed on a support post 101. The fulcrum pin 3 is provided on a central part in a width direction of the base plate part 21. The load transmission member 4 has a flat plate part 41 rotatable around the fulcrum pin 3. Each pressing member 5 has a support member 6 provided on both sides of the fulcrum pin 3 on the flat plate part 41, a shoe member 7 provided on each support member 6, and a coil spring (energizing member) 8 that provides elastic force to each shoe member 7. Each support member 6 has a swinging support shaft 64, each shoe member 7 is connected rotatably with each swinging support shaft 64, and each coil spring 8 provides the elastic force to move a tip part of each shoe member 7 downward.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ladder anti-slip device and a ladder that prevent sliding along a roof edge.

  As this type of ladder anti-skid tool and ladder, for example, even when the ladder is leaned against the keraba side of the gable roof, the pressing member formed long in the direction along the edge of the roof automatically follows the slope of the roof. Since the pressing member is stably held on the upper surface of the roof, the upper part of the ladder to which the pressing member is attached is securely held at the site of the roof. What can prevent sliding along the edge of a roof is known (for example, patent documents 1).

  By the way, for the sake of safety, it is preferable that the ladder is leaned at a predetermined angle (for example, about 70 ° with respect to the ground) from the ground to the roof side, but the leaning angle varies depending on the use situation of the ladder. It will be. For this reason, when the pressing member is configured with a large dimension in the direction from the edge of the roof to the back, depending on the standing angle of the ladder, sometimes only the base end side portion of the pressing member hits the top surface of the roof, In some cases, only the front end portion of the pressing member hits the upper surface of the roof. Therefore, in the above-mentioned Patent Document 1, the portion where the pressing member hits the upper surface of the roof is configured with a small size in the direction from the edge side of the roof to the back, and the pressing member against the change in the standing angle of the ladder Has been devised to stably hit the roof.

  That is, in the conventional anti-skid tool for ladders and ladders, the portion of the pressing member that contacts the upper surface of the roof is sufficiently long in the direction along the edge of the roof, but in the direction from the edge of the roof to the back. Is extremely short.

Noto 3121473 gazette

  The present invention has been made in view of the above circumstances, and can be stably held on the roof side by contacting the roof with a sufficiently large dimensional interval in a direction along the edge of the roof, and Even in the direction from the edge side of the roof to the back, it can be stably held on the roof side by contacting the roof with a sufficiently large dimensional interval, and thus can be more stably held on the roof side. An object of the present invention is to provide a ladder slip prevention tool and a ladder.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a ladder anti-skid device that is detachably attached to at least one side of a virtual plane including each of the columns in a ladder having columns arranged in parallel. And a base member, a fulcrum pin provided on the base member, a load transmission member rotatably provided on the fulcrum pin, and a pressing member provided on the load transmission member. The base member is formed to have a width that can be spanned at least to both of the pillars, and has a base part fixed to the ladder with a back surface facing the pillar, and the fulcrum pin has an axis thereof Is arranged at the center in the width direction of the substrate portion in a state orthogonal to the substrate portion, and the load transmitting member rotates around the axis of the fulcrum pin with the back surface facing the surface of the substrate portion. Flat provided freely And the pressing member includes a support member provided on both sides of the fulcrum pin across the fulcrum pin on the surface of the flat plate part, and a shoe member provided swingably on each of these support members And an urging member for applying an elastic force to each of the shoe members, and each of the support members has a swing support shaft provided at a position linearly penetrating the same portion of each of the support members. Each shoe member has a base end portion rotatably connected to each of the swing support shafts, and the distal end portion thereof moves up and down in a state where the swing support shaft is oriented in the horizontal direction. Each biasing member acts on the shoe member with an elastic force in a direction in which a tip portion of each shoe member moves downward in a state where the swing support shaft is oriented in the horizontal direction. It is configured to be It is a ladder for the anti-slip device.

  According to a second aspect of the present invention, in the first aspect of the present invention, the back surface of the flat plate portion is supported on the substrate portion at positions on both sides in the width direction across the fulcrum pin on the front surface side. An anti-skid tool for a ladder, characterized in that a rail-shaped guide member is provided.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the shoe member includes a first member located at the base end portion and a second member located at the distal end side of the base end portion. And a folding rotation shaft that rotatably connects the first member and the second member, and a stopper pin that holds the first member and the second member fixedly, and the second The member is formed with a long hole extending in a direction to be in contact with the first member and movably guiding the stopper pin in the direction to be in contact with the first member. A ladder anti-slip device, wherein a concave portion is formed into which the stopper pin fits when the stopper pin moves toward the first member along the elongated hole.

  According to a fourth aspect of the present invention, in the invention according to the third aspect, the folding rotation shaft is disposed in parallel with the swing support shaft, and is a slip prevention tool for a ladder. .

  The invention according to claim 5 is the invention according to claim 3 or 4, wherein in the recess, the first member and the second member linearly extend from the base end portion to the tip end portion. The ladder anti-slip device, wherein the stopper pin is formed at a leading edge of the first member so that the stopper pin fits in the state.

  The invention according to claim 6 is the invention according to any one of claims 3 to 5, wherein a stopper member for preventing the stopper pin from falling off is provided at both ends of the stopper pin. One of the retaining members is provided with a brake urging member that applies an elastic force to the second member from the one retaining member.

  A seventh aspect of the present invention is a ladder comprising the ladder antiskid device according to any of the first to sixth aspects.

  According to the first aspect of the present invention, by fixing the base plate portion of the foundation member to the ladder, the ladder anti-skid device of the present invention can be attached to, for example, one side of the virtual surface of the ladder. In this state, it may be necessary to place the ladder against the keraba side of the gable roof, for example, with the anti-skid tool for the ladder directed to the building side. In this case, first, the leaning angle of the ladder is adjusted so that each shoe member hits each of the upper and lower positions of the inclined roof. At this time, the load transmitting member automatically rotates around the axis of the fulcrum pin, and each shoe member is in a state of being surely in contact with each height position on the upper surface of the roof. That is, each shoe member is brought into contact with a position along the edge of the roof with a sufficiently large dimensional interval that can be taken as a dimension between the one shoe member and the other shoe member based on the width dimension of the substrate portion. Can do.

  Moreover, each shoe member pivots up and down around the swing support shaft in accordance with the leaning angle of the ladder, so that the lower surface of each shoe member comes into contact with the upper surface of the roof as a whole. . Further, each shoe member receives an elastic force from the urging member and comes into contact with the upper surface of the roof with a predetermined pressure. For example, when the ladder is leaned at an angle of 70 ° with respect to the ground, the shoe member is brought into contact with the upper surface of the roof by rotating approximately 20 ° with respect to the horizontal direction. That is, each shoe member can be brought into contact with a position along the direction from the edge side of the roof to the back with a sufficiently large distance from the base end side to the tip end side of each shoe member.

  From the above, even when the ladder is leaned against the keraba side, the shoe members abut against the top surface of the roof with a sufficiently long dimensional interval both in the direction along the edge of the roof and in the direction from the edge of the roof to the back. Each shoe member can be brought into contact with the upper surface of the roof with a predetermined pressure (that is, with a predetermined frictional force). Therefore, the ladder can be held very stably on the roof side. That is, it is possible to reliably prevent the ladder from sliding along the edge of the roof or falling down in a direction away from the edge of the roof.

  When the ladder is leaned against the eaves side, the shoe members are in contact with the upper surface of the roof at a predetermined interval in the horizontal direction. Further, each shoe member rotates around the swing support shaft in accordance with the inclination angle of the roof, and the lower surface of each shoe member comes into contact with the upper surface of the roof as a whole. That is, each shoe member can be brought into contact with the upper surface of the roof with a sufficiently large dimensional interval in both the direction along the edge of the roof and in the direction from the edge side of the roof to the back side. It can be brought into contact with the upper surface of the roof with a predetermined pressure. That is, it is possible to reliably prevent the ladder from sliding along the edge of the roof or falling down in a direction away from the edge of the roof.

  According to the second aspect of the present invention, the rail-shaped guide members that support the back surface of the flat plate portion are provided at positions on both sides in the width direction across the fulcrum pin on the front surface side of the substrate portion. An external force acting on the flat plate portion from the shoe member via the swing support shaft and the support member can also be received by the guide member, and the ratio of the external force acting on the fulcrum pin can be reduced as much as possible. Therefore, the load transmitting member can be smoothly rotated around the axis of the fulcrum pin. Further, even when a convex portion such as a rivet exists on the surface side of the substrate portion, there is an advantage that the rotation of the load transmitting member is not hindered.

  According to the third aspect of the present invention, the folding member is a folding rotation shaft in which the shoe member rotatably connects the first member, the second member located on the distal end side thereof, and the first member and the second member. Therefore, the amount of the shoe member protruding from the substrate portion can be reduced by tilting the second member to the substrate portion side of the base member via the folding rotation shaft. Therefore, the efficiency at the time of conveyance and storage of the slip prevention tool for ladder can be improved.

  On the other hand, by fitting the stopper pin into the recess of the first member, the first member and the second member are connected by the two shafts of the swing support shaft and the stopper pin. It is possible to obtain a shoe member that is firmly integrated with the two members and is relatively undisplaceable.

  According to the fourth aspect of the present invention, since the folding rotation shaft is disposed in parallel with the swing support shaft, the folding support shaft and the swing support acting on the first member and the second member are supported. The direction of the bending moment around the axis is the same. Accordingly, there is an advantage that the strength of the first member, the second member, etc. can be easily calculated, and a highly safe one can be easily designed.

  According to the fifth aspect of the present invention, in the state where the first member and the second member extend linearly from the base end portion to the tip end portion, the concave portion of the first member is fitted so that the stopper pin fits. Since it is formed at the leading edge, it is possible to obtain a long shoe member extending linearly in which the first member and the second member are integrated, and the shoe member can be folded compactly. There is an advantage.

  According to the sixth aspect of the present invention, the stopper pin is provided at both ends of the stopper pin to prevent the stopper pin from falling out of the elongated hole, and one of the retaining members is provided with the second from the one retaining member. Since the urging member for braking which gives elastic force to the member is provided, the stopper pin is moved in a predetermined direction in the direction along the long hole by the frictional force generated in a portion such as between the other retaining member and the second member. It can be securely held in position. Therefore, the stopper pin can be reliably held in the state fitted in the recess of the first member. Further, when the first member and the second member are folded, the stopper pin can be held out of the recess.

  According to the seventh aspect of the present invention, since the ladder slip prevention device according to any one of the first to sixth aspects is provided, it is possible to reliably prevent slippage in the upper part on the roof side. . Therefore, even when leaning on the keraba side of the gable roof, it is possible to safely ascend and descend, and it is also possible to work safely while staying on, for example, a step rail spanned between columns.

It is a figure which shows the slip prevention tool for ladders shown as one Embodiment of this invention, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows the slip prevention tool for ladders, Comprising: (a) is the IIA arrow directional view of Fig.1 (a), (b) is a figure corresponding to the IIA arrow directional view of Fig.1 (a). 2 is a view showing a state in which the shoe member is rotated upward with the swing support shaft as a fulcrum, and FIG. 2C is a view corresponding to the view taken along the arrow IIA in FIG. It is a figure which shows the state which folded the 2nd member to the base member side with respect to the 1st member. It is a figure which shows the slip prevention tool for ladders, Comprising: (a) is a principal part enlarged front view which shows the IIIA part in FIG.1 (b), (b) is a cross section in alignment with the IIIB-IIIB line | wire in (a). FIG. It is a figure which shows the slip prevention tool for ladders, Comprising: (a) is explanatory drawing which shows the state which deleted the shoe member and the coil spring among what is shown to Fig.3 (a), (b) is (a). (C) is an IVC arrow view of (a), (d) is an explanatory view in which a first member and a coil spring are added to (a), (e) [FIG. 4] It is explanatory drawing which added the 2nd member and the folding rotational axis with respect to (d). It is a figure which shows the slip prevention tool for ladders, Comprising: (a) is sectional drawing which follows the VA-VA line in Fig.3 (a), (b) is along the VA-VA line in Fig.3 (a). It is a figure corresponding to sectional drawing, Comprising: It is a figure which shows the state by which the stopper pin was engage | inserted by the recessed part of the 1st member, (c) respond | corresponds to sectional drawing in alignment with the VA-VA line in Fig.3 (a). It is a figure which is a figure, Comprising: A stopper pin is engage | inserted by the recessed part of a 1st member, and it is a figure which shows the state which the shoe member rotated upwards the predetermined angle about the rocking | fluctuation support shaft. It is a figure which shows the slip prevention tool for ladders, Comprising: It is a figure corresponding to sectional drawing in alignment with the VA-VA line in Fig.3 (a), Comprising: The 2nd member of a shoe member is folded with respect to a 1st member It is a figure which shows the state folded over and turned to the base member side by using a rotating shaft as a fulcrum. It is a rear view which shows the slip prevention tool for ladders. It is a figure which shows the state which leaned the ladder which attached the slip prevention tool for ladders on the keraba side of the gable roof, Comprising: (a) is explanatory drawing shown from the back side of the said slip prevention tool for ladders, (b ) Is an explanatory view showing the relationship between the ladder slip prevention tool and the roof.

  A ladder anti-skid device and a ladder provided with the same shown as an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 8, the ladder anti-skid device 1 shown in this embodiment has each column in a ladder 100 having a plurality of stepped rails 102 spanned between columns 101 and 101 arranged in parallel. 101, 101 is configured to be detachably attached to one side or the other side of the virtual plane including 101. In this example, the support columns 101 and 101 are arranged in parallel with a predetermined interval, and each traverse 102 is provided with a certain interval in the longitudinal direction of the support column 101. Show.

  The ladder slip prevention tool 1 includes a base member 2, a fulcrum pin 3 provided on the base member 2, a load transmission member 4 provided rotatably on the base member 2 via the fulcrum pin 3, And a pressing member 5 provided on the load transmission member 4.

  As shown in FIGS. 1 to 3, the base member 2 is formed to have a width that can be passed over at least both the columns 101 and 101, with the back surface facing the columns 101 and 101 and both sides of the back surface in the width direction. It has the board | substrate part 21 fixed to the ladder 100 in the state which applied the part to each support | pillar 101. FIG. That is, the base member 2 is formed based on a right-angled rectangular aluminum plate having a predetermined length in the width direction and the length direction, and each edge in the length direction has a constant width. Reinforcing ribs 22 and 22 are formed by being bent at right angles to the surface side, and the above-described substrate portion 21 is formed between the reinforcing ribs 22 and 22. Thereby, the board | substrate part 21 is formed in the right-angled square-shaped flat plate shape. In addition, it is preferable that the width | variety of the base member 2 shall be a bigger dimension than the dimension between the outer edges of each support | pillar in the ladder marketed normally. However, the width of the foundation member 2 may be a dimension that is simply larger than the dimension between the outer edges of each column in a predetermined ladder that is commercially available.

  As shown in FIGS. 1B and 7, the substrate portion 21 is formed with long holes 21 a extending in the width direction at the four corner portions. Each of the long holes 21a can be fixed to the columns 101 and 101 having different intervals by the clamp 23 by making it possible to adjust the mounting position of the clamp 23 for fixing the base member 2 to the columns 101 and 101 in the width direction. Is possible. In this case, the clamp 23 clamps the main part of the column 101 between the clamp 23 and the back surface of the substrate part 21 based on the tightening force of the bolt 24, and thereby the base member 2 is attached to the columns 101 and 101. It is designed to be fixed at an arbitrary position in the longitudinal direction.

  The bolt 24 is formed to have a diameter movable along the long hole 21 a in a state in which a shaft portion having a screw is inserted into the long hole 21 a, and the nut 25 is welded to the clamp 23. It is designed to be screwed onto. That is, the clamp 23 is moved along the long hole 21 a along with the bolt 24, and by tightening the bolt 24, the main part of the support column 101 is strongly clamped between the clamp 23 and the back surface of the substrate part 21. ing.

  As shown in FIG. 1, the fulcrum pin 3 has a center position (center portion) in the width direction of the substrate portion 21 and a substantially center position (center position) in the width direction of the substrate portion 21 in a state where the axis is orthogonal to the substrate portion 21. Part). That is, a through hole is formed in the substrate portion 21 at the center position in the width direction and substantially at the center position in the vertical direction, and the fulcrum pin 3 is inserted into the through hole. Particularly in this example, the fulcrum pin 3 is formed of a bolt, and is configured to support the load transmission member 4 so as to be rotatable about its axis.

  The load transmission member 4 has a flat plate portion 41 provided so as to be rotatable around the axis of the fulcrum pin 3 with the back surface thereof facing the surface of the substrate portion 21. That is, the load transmitting member 4 includes a flat plate portion 41 having a predetermined width extending linearly and a straight plate portion 42 formed so as to rise perpendicularly from one edge portion in the width direction of the flat plate portion 41 to the surface side. Are formed in an L-shaped cross section. The flat plate portion 41 is formed with a through hole into which a shaft portion having a screw in the fulcrum pin 3 is inserted at a central position in the longitudinal direction and at a substantially central position in the width direction.

  The fulcrum pin 3 has a shaft portion inserted into the through hole of the flat plate portion 41 and the through hole of the substrate portion 21 from the front surface side of the flat plate portion 41 and protrudes from the back surface of the substrate portion 21. The nut 3b is screwed to the shaft portion. (The shaft portion of the fulcrum pin may be inserted from the back surface side of the substrate portion 21 and screwed into the nut 3b provided on the front surface side of the flat plate portion 41.) The nut 3b has a function of preventing looseness. It has become.

  Further, a flat washer 3 c is provided on the shaft portion of the fulcrum pin 3 between the hexagonal head portion 3 a and the flat plate portion 41 of the fulcrum pin 3 and between the nut 3 b and the substrate portion 21. Further, a predetermined number of plain washers 3 c are provided between the substrate portion 21 and the flat plate portion 41 at the shaft portion of the fulcrum pin 3. The flat washer 3c between the substrate portion 21 and the flat plate portion 41 has a characteristic of functioning as a spacer capable of adjusting the distance between the substrate portion 21 and the flat plate portion 41 in stages, and as a friction reducing means during rotation. Has functional characteristics.

  The board portion 21 is provided with rail-shaped guide members 26 that slidably support the back surface of the flat plate portion 41 at both positions in the width direction across the fulcrum pin 3 on the front surface side. Each guide member 26 is fixed to the substrate portion 21 with a rivet R in a state of extending in the vertical direction. Each guide member 26 is located at the same position from the fulcrum pin 3.

  The pressing member 5 includes support members 6 and 6 provided on both sides of the fulcrum pin 3 across the fulcrum pin 3 on the surface of the flat plate portion 41, and at the same position from the fulcrum pin 3. 6 is provided with a shoe member 7 that is swingably provided, and a coil spring (biasing member) 8 that imparts an elastic force to each shoe member 7.

  As shown in FIG. 4, each support member 6 includes a connecting plate portion 61 formed in a right-angled square shape, and a support wall that rises at a right angle from a pair of parallel sides of the connecting plate portion 61 and faces each other in parallel. The shape is provided with the parts 62 and 62. The support member 6 is configured so that each support wall portion 62 is directed in a direction orthogonal to the straight plate portion 42 of the load transmitting member 4 and the connecting plate portion 61 is placed on the surface of the flat plate portion 41. The connecting plate portion 61 is fixed to the flat plate portion 41 with rivets R. Further, the support member 6 has flange portions 63 formed at right angles from the support wall portions 62 so as to follow the straight plate portions 42, and the flange portions 63 are fixed to the straight plate portions 42 with rivets R. Yes.

  The straight plate portion 42 is provided with a sliding stabilization member 43 on the back side of the portion where the support members 6 are provided. The sliding stabilizing member 43 is formed in a cross-sectional L shape by a flat plate 43a and a straight plate 43b narrower than the flat plate portion 41, and the lower surface of the flat plate 43a is flush with the lower surface of the flat plate portion 41. The straight plate 43b is fixed to the straight plate portion 42. In this case, the straight plate 43 b is fixed to the straight plate portion 42 using a rivet R that fixes each flange portion 63 of the support member 6 to the straight plate portion 42. The sliding stabilizing member 43 slides on the guide member 26 together with the flat plate portion 41 to assist the load transmitting member 4 to smoothly rotate around the fulcrum pin 3. The sliding stabilization member 43 also has a characteristic of reinforcing a portion where the support member 6 is attached in the load transmission member 4.

  Further, a locking portion 4a for hooking one hook 8a of a coil spring 8 to be described later is formed at a portion of the load transmitting member 4 where the straight plate portion 42 and the straight plate 43b are overlapped. The latching | locking part 4a is formed of the part between the small through-hole 4b and the large through-hole 4c which penetrate the straight plate part 42 and the straight plate 43b. In this case, the small through hole 4b is formed to have a diameter that is at least larger than the wire diameter of the hook 8a, and the large through hole 4c is formed to have a diameter that allows at least the hook 8a to be inserted.

  On the other hand, each support member 6 is provided with a swing support shaft 64. Each swing support shaft 64 is constituted by a bolt, and the shaft portion having the screw is at the same position of each support wall portion 62 in each of the left and right support members 6, and the support wall portion 62 has the same position. It arrange | positions in the position extended linearly in the orthogonal direction. That is, each swing support shaft 64 is disposed at a coaxial position in each support member 6 and is in a direction orthogonal to the axis of the fulcrum pin 3 and in a direction parallel to the longitudinal direction of the flat plate portion 41. It is provided to extend.

  In this case, each support wall portion 62 is formed with a coaxially formed through hole, and the shaft portion of the swing support shaft 64 is inserted into the through hole. In this case, in the swing support shaft 64, the hexagonal head 64a of the swing support shaft 64 is disposed outside one of the support wall portions 62, 62 disposed in parallel, and the swing support shaft 64 is disposed outside the other. A nut 64b having a loosening prevention function that is screwed into the shaft portion of the support shaft 64 is arranged. That is, the swinging support shaft 64 is reliably prevented from dropping from the support wall portions 62 and 62 by the head portion 64a and the nut 64b in a state where the shaft portion is spanned over the support wall portions 62 and 22. It is in a state. A flat washer 64 c is provided on the shaft portion of the swing support shaft 64 between the head portion 64 a and the one support wall portion 62, and between the nut 64 b and the other support wall portion 62.

  As shown in FIGS. 2 to 6, the shoe member 7 has a base end portion rotatably connected to the swing support shaft 64, and the swing support shaft 64 is oriented in the horizontal direction. The tip portion is configured to move up and down.

  The shoe member 7 rotates the first member 71 located at the base end portion, the second member 72 located at the distal end side of the first member 71, and the first member 71 and the second member 72. A folding rotation shaft 73 that is freely connected and a stopper pin 74 that holds the first member 71 and the second member 72 in a fixed manner are provided.

  The first member 71 is a flat aluminum plate formed in a U-shaped cross-section, and has a shape having parallel plate portions 71a and 71a opposed in parallel and a lower surface portion 71b connecting these lower edges. It has become. The parallel plate portions 71a and 71a are set so that the interval thereof fits between the support wall portions 62 and 62 of the support member 6, and penetrate the shaft portion of the swing support shaft 64 so as to be freely rotatable. It has a hole. Further, a concave portion 71c for fitting a stopper pin 74 described later is formed at each end edge of the parallel plate portions 71a and 71a.

  Further, as shown in FIG. 3 (b), a U-shaped notch 71d is formed at the base edge of the lower surface 71b, and penetrates at a predetermined interval with respect to the bottom of the notch 71d. A hole 71e is formed. And the part between this notch 71d and the through-hole 71e becomes the latching | locking part 71f which latches the other hook 8a of the coil spring 8 mentioned later. In this case, the notch 71d is formed to have a width that is at least larger than the wire diameter of the hook 8a, and the through hole 71e is formed to have a diameter that is at least larger than the wire diameter of the hook 8a.

  Further, as shown in FIGS. 3B and 5, the lower surface portion 71 b has a stopper 71 g that stops the rotation of the first member by abutting the base end of the lower surface portion 71 b against the connecting plate portion 61 of the support member 6. It has become. That is, the stopper 71g contacts the connecting plate portion 61 with the lower surface portion 71b of the first member 71 being substantially perpendicular to the connecting plate portion 61, and the elastic force of the coil spring 8 causes the first member 71 to move. The tip side is prevented from being further displaced downward.

  The second member 72 is a planar aluminum plate formed in a U-shaped cross section, and has a shape having parallel plate portions 72a and 72a facing each other in parallel and a lower surface portion 72b connecting the lower edges thereof. ing. The parallel plate portions 72 a and 72 a are set so that the distance between them is located outside the support wall portions 62 and 62 of the support member 6.

  Further, as shown in FIG. 3B, each parallel plate portion 72 b is rotated around each parallel plate portion 71 a of the first member 71 arranged so that the base end portion thereof is overlapped by a folding rotation shaft 73. It is connected freely. The folding rotation shaft 73 is constituted by a bolt, and is provided in each of a portion connecting one parallel plate portion 71a, 72a and a portion connecting the other parallel plate portion 71a, 72a.

  That is, one folding rotation shaft 73 has a shaft portion having a screw inserted into a through hole formed in each of the parallel plate portions 72a and 71a, and is loosened by a shaft portion protruding from the parallel plate portion 71a. A nut 73b having a prevention function is screwed together. Thereby, the one folding rotation shaft 73 is in a state in which the hexagonal head 73a and the nut 73b are arranged outside the one parallel plate portions 72a and 71a, and the fall off from these through holes is prevented. It is to be prevented. The folding rotation shaft 73 is arranged in parallel with the swing support shaft 64.

  Further, a predetermined number of plain washers 73c are provided between the parallel plate portions 72a and 71a on the shaft portion of the one folding rotation shaft 73. These flat washers 73c have a characteristic that functions as a spacer for holding one parallel plate portion 72a so as to be positioned outside the one support wall portion 62 of the support member 6 at a predetermined interval. ing.

  Similarly to the one folding rotation shaft 73, the other folding rotation shaft 73 is provided on the other parallel plate portion 72a, 71a, and therefore, the same reference numeral is given in FIG. The description is omitted.

  Further, as shown in FIGS. 5 and 6, the lower surface portion 72 b is formed with a notch portion 72 c at the base end side portion. As shown in FIG. 6, the notch portion 72 c is configured such that when the second member 72 is rotated downward around the folding rotation shaft 73, the lower surface portion 72 b is the lower surface portion 71 b of the first member 71 and the support member. By hitting 6 etc., the rotation range is prevented from being restricted. However, as shown in FIG. 5, the base end side portion of the lower surface portion 72 b is formed so as to contact the distal end portion of the lower surface portion 71 b of the first member 71, and by this contact, the second member 72 is formed. The lower surface portion 72 b of the first member 71 is maintained so as to face the same direction as the lower surface portion 71 b of the first member 71, and the second member 72 is further transmitted to the first member 71 to rotate upward. Further, as shown in FIGS. 1 and 3, a plurality of lightening holes 72 d are formed in the lower surface portion 72 b of the second member 72.

  Further, as shown in FIGS. 2, 5, and 6, the second member 72 extends to the parallel plate portions 72a and 72a in the direction of separating from and coming into contact with the first member 71, and the direction in which the stopper pin 74 is separated from and brought into contact therewith. A long hole 72e is formed so as to be freely movable. The long hole 72e is in a state where the base end portion of the lower surface portion 72b is in contact with the distal end portion of the lower surface portion 71b of the first member 71 (that is, the lower surface portion 72b is in the same direction as the lower surface portion 71b of the first member 71). When the stopper pin 74 is guided to the first member 71 side, the position and the extending direction in each parallel plate portion 72a are such that the stopper pin 74 can be fitted into the recess 71c. Is set. In other words, the recess 71c in the first member 71 is fitted with the stopper pin 74 in a state where the first member 71 and the second member 72 linearly extend from the base end portion to the tip end portion. It is formed at the leading edge of the first member 71. In this example, the long hole 72e extends in a straight line parallel to the lower surface portion 72b.

  As shown in FIG. 3B, the stopper pin 74 is configured by a bolt, and the shaft portion having the screw extends from the long hole 72e of one parallel plate portion 72a to the length of the other parallel plate portion 72a. A nut 74b having a function of preventing loosening is screwed into a shaft portion inserted into the hole 72e and protruding from the other long hole 72e. The shaft portion of the stopper pin 74 is provided with two plain washers 74c and 74c between the other parallel plate portion 72a and the nut 74b, and a compression coil between the plain washers 74c and 74c. A spring 74d is provided. A flat washer 74d is also provided between the hexagonal head portion 74a of the stopper pin 74 and one parallel plate portion 72a.

  The compression coil spring 74d applies an elastic force to the plain washers 74c and 74c in a direction to widen the distance between them, so that the flat washer 74d on the head 74a side of the stopper pin 74 has a predetermined elasticity on one parallel plate portion 72a. While being brought into contact with force, one plain washer 74c on the nut 74b side is brought into contact with the other parallel plate portion 72a with a predetermined elastic force. That is, the stopper pin 74 has a frictional force between the flat washer 74d on the head 74a side and the one parallel plate portion 72a, and a frictional force between the flat washer 74c on the nut 74b side and the other parallel plate portion 72a. By this, it is held at an arbitrary position in the long hole 72e. Thereby, the stopper pin 74 can be maintained in a state of being fitted into the recess 71c of the first member 71, or can be maintained in a state of being pulled out of the recess 71c.

  The head 74a and the nut 74b are retaining members provided at both ends of the stopper pin 74 in order to prevent the stopper pin 74 from falling out of the long hole 72e. The compression coil spring 74d is a braking urging member that applies an elastic force to the second member 72 from at least one retaining member.

  The coil spring 8 is configured to act on the shoe member 7 with an elastic force in a direction in which the distal end portion of the shoe member 7 moves downward in a state where the swing support shaft 64 is oriented in the horizontal direction. That is, the coil spring 8 is constituted by a tension spring provided with hooks 8 a and 8 a at both ends in the expansion / contraction direction, and one hook 8 a is hooked on a locking portion 4 a formed on the load transmission member 4. The other hook 8 a is provided in a state of being hooked on a locking portion 71 f formed on the lower surface portion 71 b of the first member 71. As a result, the coil spring 8 acts on the base end portion of the first member 71 located on the base end side of the swing support shaft 64 by applying an elastic force in a direction to be always pulled upward, whereby the swing support shaft 64 An elastic force in a downward direction is applied to the distal end portion of the second member 72 located on the distal end side.

  However, since the stopper 71g hits the connecting plate portion 61, the lower surface portion 71b of the first member 71 does not rotate further downward from the state of being substantially perpendicular to the connecting plate portion 61. That is, with respect to the shoe member 7 in which the first member 71 and the second member 72 are integrated by the stopper pin 74, the lower surface portion 72b of the second member 72 is substantially perpendicular to the connecting plate portion 61. Further, it does not rotate downward. However, it is possible to rotate around the swing support shaft 64 upward from this state while resisting the elastic force of the coil spring 8.

  In addition, about the 1st member 71, the dimension from a base end to a front-end | tip is comprised by what is as small as possible. On the other hand, the second member 72 has a long length from the proximal end to the distal end so that the second member 72 can abut on the upper surface of the roof 200 with a sufficiently large dimension in the direction from the edge side of the roof 200 to the inner side. It is made up of. That is, the second member 72 is configured to be sufficiently longer than the first member 71.

  And the ladder 100 provided with the said slip prevention tool 1 for ladders becomes a ladder provided with the structure and characteristic of the said slip prevention tool 1 for ladders.

  In the ladder anti-skid device 1 configured as described above, the base member 2 substrate portion 21 is fixed to the columns 101 and 101 of the ladder 100 by the clamps 23, so that the ladder anti-skid device 1 is attached to the ladder 100. Can be attached to one side, the other side, or both sides of the above-described virtual surface. In addition, about each shoe member 7, the 1st member 71 and the 2nd member 72 are integrated by inserting the stopper pin 74 in the recessed part 71c of the 1st member 71. FIG. In this state, as shown in FIG. 8, the ladder anti-skid tool 1 is directed toward the building, and the ladder 100 is leaned against, for example, the gable roof 201 side of the gable roof. In this case, the leaning angle of the ladder 100 is adjusted so that each of the shoe members 7 and 7 hits the upper and lower positions of the inclined roof 200. At this time, the load transmitting member 4 automatically rotates around the axis of the fulcrum pin 3, and each shoe member 7 is in a state of being surely in contact with each height position on the upper surface of the roof 200. That is, each shoe member 7 can be brought into contact with the position along the edge of the roof 200 with a sufficiently large dimensional interval set based on the interval between the shoe members 7, 7.

  In addition, each shoe member 7 receives an angular displacement in the vertical direction from the roof 200 according to the leaning angle of the ladder 100, and thus rotates up and down around the swing support shaft 64. The lower surface of each shoe member 7 (particularly, the lower surface of the lower surface portion 72b of the second member 72) comes into contact with the upper surface of the roof 200 as a whole. At this time, each shoe member 7 receives the elastic force from the coil spring 8 and comes into contact with the upper surface of the roof 200 with a predetermined pressure. For example, when the ladder 100 is leaned at an angle of 70 ° with respect to the ground, the shoe member 7 is rotated by approximately 20 ° with respect to the horizontal direction (20 ° upward from a state orthogonal to the connecting plate portion 61). Each shoe member 7 comes into contact with the upper surface of the roof 200 by the elastic force of the coil spring 8 based on the rotation angle. Thus, each shoe member 7 can be brought into contact with a position from the edge side of the roof 200 toward the back with a sufficiently large dimension interval set based on the length from the base end side to the tip end side of each shoe member 7. it can.

  Therefore, even when the ladder 100 is leaned against the keraba 201 side, each shoe member 7 is attached to the roof 200 with a sufficiently long dimensional interval both in the direction along the edge of the roof 200 and in the direction from the edge side of the roof 200 to the back. The shoe members 7 can be brought into contact with the upper surface of the roof 200 with a predetermined pressure (that is, with a predetermined frictional force). Therefore, the ladder 100 can be held extremely stably on the roof 200 side. In other words, it is possible to reliably prevent the ladder 100 from sliding along the edge of the roof 200 or falling in a direction away from the edge of the roof 200.

  In addition, when the ladder 100 is leaned against the eaves side, the shoe members 7 are in contact with the upper surface of the roof 200 at a predetermined interval in the horizontal direction. In addition, each shoe member 7 rotates around the swing support shaft 64 according to the inclination angle of the roof 200, and the lower surface of each shoe member 7 comes into contact with the upper surface of the roof 200 as a whole. That is, each shoe member 7 can be brought into contact with the upper surface of the roof 200 with a sufficiently large dimensional interval both in the direction along the edge of the roof 200 and in the direction from the edge side of the roof 200 to the back. Each shoe member 7 can be brought into contact with the upper surface of the roof 200 with a predetermined pressure.

  In addition, rail-like guide members 26 that slidably support the back surface of the flat plate portion 41 are provided at positions on both sides in the width direction across the fulcrum pin 3 on the front surface side of the substrate portion 21. The external force acting on the flat plate portion 41 from the member 7 through the swing support shaft 64 and the support member 6 can be received by the guide member 26, and the external force acting directly on the fulcrum pin 3 is reduced as much as possible. Can do. Therefore, the load transmitting member 4 can be smoothly rotated around the axis of the fulcrum pin 3. Further, even when a convex portion such as a rivet exists on the surface side of the substrate portion 21, there is no hindrance to the rotation of the load transmission member 4.

  Furthermore, since the shoe member 7 is configured to include the first member 71, the second member 72, and the folding rotation shaft 63 that rotatably couples them, the second member 72 is folded. By tilting the base member 2 toward the substrate portion 21 via the rotation shaft 63, the amount of the shoe member 7 protruding from the substrate portion 21 can be reduced. Therefore, the efficiency at the time of conveyance and storage of the ladder slip prevention tool 1 can be improved.

  On the other hand, by fitting the stopper pin 74 into the recess 71 c of the first member 71, the first member 71 and the second member 72 are connected by the two shafts of the swing support shaft 64 and the stopper pin 74. Therefore, the first member 71 and the second member 72 become an integrated shoe member 7 that is relatively undisplaceable.

  Further, since the folding rotation shaft 63 is disposed in parallel with the swing support shaft 64, the folding rotation shaft 63 and the swing support shaft 64 around the folding rotation shaft 63 acting on the first member 71 and the second member 72 are arranged. Since the directions of the bending moments are the same, the strength of the first member 71, the second member 72, etc. can be easily calculated, and there is an advantage that a highly safe one can be easily designed.

  Further, in a state where the first member 71 and the second member 72 extend linearly from the base end portion to the tip end portion, a recess 71 c is formed at the tip edge of the first member 71 so that the stopper pin 74 is fitted. Therefore, the long shoe member 7 extending linearly in which the first member 71 and the second member 72 are integrated can be obtained, and the shoe member 7 can be folded compactly. There is an advantage.

  Furthermore, a head 74a and a nut 74b are provided at both ends of the stopper pin 74 to prevent the stopper pin 74 from coming off from the long hole 72e. A flat washer 74c is provided from the nut 74b to the second member 72 on the nut 74b side. Since the compression coil spring 74d that provides an elastic force is provided through the stopper pin 74, the stopper pin 74 is formed into a long hole by a frictional force generated in a portion such as between the flat washer 74c on the head 74a side and the second member 72. 72e can be reliably held at a predetermined position. Therefore, the stopper pin 74 can be reliably held in a state of being fitted into the recess 71 c of the first member 71. Further, when the first member 71 and the second member 72 are folded, the stopper pin 74 can be held in a state of being pulled out from the recess 71c.

  And in the ladder 100 provided with the ladder slip prevention tool 1, it can prevent reliably that a slip arises in the upper part by the side of the roof 200. FIG. For this reason, even when leaning on the side of the gable roof 201 on the gable roof, it is possible to safely go up and down, and it is also possible to work safely while staying on the crosswalk 102.

  Further, the leaning angle of the ladder 100 is preferably 70 ° with respect to the ground as described above, but this angle may be 70 ° ± 10 ° depending on the situation of the construction site or the like. possible. That is, the leaning angle may be 60 ° to 80 °. In the case of 60 °, the shoe member 7 is rotated 30 ° upward from a state orthogonal to the connecting plate portion 61. Therefore, the shoe member 7 is preferably configured to rotate upward by at least 30 °.

  In the above-described embodiment, the ladder provided with the two support columns 101 arranged in parallel is shown. However, the support columns may be arranged in parallel, and always be in parallel. It does not have to be arranged. That is, the support columns arranged in parallel may be formed such that the interval gradually narrows upward, for example. Even in this case, the ladder 23 can be securely fixed to the column by the clamp 23. Further, the ladder may be provided with two or more support columns in parallel. Also in this case, the ladder anti-skid tool 1 can be fixed to any two struts by the clamps 23.

  In the above embodiment, an example in which each member is connected by the rivet R has been described. However, these members may be connected by welding. That is, the board portion 21 and the guide member 26, the flat plate portion 41 and the connecting plate portion 61, the straight plate portion 42 and the flange portion 63, and the straight plate portion 42 and the straight plate 43b may be connected by fillet welding or butt welding. Good. In this case, it is preferable to use argon welding because an aluminum member is to be welded. In addition, the welding is preferably performed by continuous welding or intermittent welding in consideration of the connection strength and the like.

DESCRIPTION OF SYMBOLS 1 Ladder prevention tool 2 Ladder member 3 Support pin 4 Load transmission member 5 Press member 6 Support member 7 Shoe member 8 Coil spring (biasing member)
21 substrate part 26 guide member 41 flat plate part 64 swing support shaft 71 first member 71c recess 72 second member 72e long hole 73 folding rotation shaft 74 stopper pin 74d compression coil spring (braking biasing member)
100 Ladder 101 Post

Claims (7)

An anti-skid tool for a ladder that is detachably attached to at least one side of a virtual surface including each of the columns in a ladder having columns arranged in parallel,
A base member, a fulcrum pin provided on the base member, a load transmission member provided rotatably on the fulcrum pin, and a pressing member provided on the load transmission member.
The base member is formed to have a width that can be spanned at least to both of the columns, and has a substrate portion that is fixed to the ladder with a back surface facing the column,
The fulcrum pin is arranged at the center in the width direction of the substrate portion with its axis orthogonal to the substrate portion.
The load transmitting member has a flat plate portion that is rotatably provided around the axis of the fulcrum pin in a state where the back surface faces the surface of the substrate portion.
The pressing member includes a support member provided on both sides of the fulcrum pin across the fulcrum pin on the surface of the flat plate portion, a shoe member provided swingably on each of these support members, and each of these An urging member for applying elastic force to the shoe member,
Each of the support members has a swing support shaft provided at a position that linearly penetrates the same portion of each of the support members,
Each shoe member has a base end portion rotatably connected to each swing support shaft, and a tip portion thereof moves up and down in a state where the swing support shaft is oriented in the horizontal direction. Configured,
Each of the urging members is configured to act on the shoe member with an elastic force in a direction in which a distal end portion of each shoe member moves downward in a state where the swing support shaft is oriented in the horizontal direction. An anti-skid tool for ladders,   The rail-like guide member which supports the back of the flat plate part is provided in the board part on both sides of the width direction across the fulcrum pin on the surface side. The anti-skid tool for ladders according to 1. The shoe member includes a first member located at the base end portion, a second member located at the distal end side of the base end portion, and a fold that connects the first member and the second member rotatably. A rotation shaft, and a stopper pin that holds the first member and the second member fixedly,
The second member is formed with a long hole extending in a direction to be in contact with the first member and movably guiding the stopper pin in the direction to be in contact with the separation.
The first member is formed with a concave portion at a tip edge thereof into which the stopper pin is fitted when the stopper pin moves toward the first member along the elongated hole. The ladder anti-skid device according to claim 1 or 2.   The ladder anti-slip device according to claim 3, wherein the folding rotation shaft is disposed in parallel with the swing support shaft.   The concave portion is formed at the distal end edge of the first member so that the stopper pin fits in a state where the first member and the second member linearly extend from the proximal end portion to the distal end portion. The ladder slip prevention tool according to claim 3 or 4, wherein the ladder slip prevention tool is provided. At both ends of the stopper pin, a retaining member that prevents the stopper pin from falling off is provided,
6. The braking biasing member for applying an elastic force to the second member from the one retaining member is provided on one of the retaining members. 6. Anti-skid tool for ladders. A ladder comprising the ladder antiskid device according to any one of claims 1 to 6.

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