JPH0732198U - Tripod ladder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tripod ladder with easy leg length adjustment and excellent lift safety. [Structure] A plurality of horizontal rails 3 are provided between a pair of left and right front legs 2 and 2.
To provide. The auxiliary leg 11 is inserted into the lower end of the front leg 2 so as to be able to move back and forth. A fixture 12 for fixing the position of the auxiliary leg 11 is provided. [Effect] Since the length of the front leg 2 can be adjusted by the fixing tool 12, the horizontal rail 3 can be installed horizontally even in a place where irregularities are complicated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tripod ladder made of aluminum or the like in which a supporting leg is connected to the tip of a long ladder.

[0002]

[Prior art]

 Conventionally, this type of tripod has been widely used for afforestation, construction, civil engineering or landscaping, and for example, the tripod stepladder of Japanese Utility Model Publication No. 52-25633 is known. In this tripod stepladder, horizontal ladders are provided in a plurality of stages between a pair of left and right front legs to form a long ladder, and a support leg is rotatably pivoted to the upper end of the long ladder to open the long ladder and the support leg. It is lifted up and down by legs, and telescopic legs are provided at the lower end of its supporting legs so that it can move back and forth. Further, Japanese Utility Model Laid-Open No. 3-108797 discloses a tripod ladder in which a lower pipe is provided at the lower end of a support leg in a forward / backward direction by way of a fastening metal member.

[0003]

[Problems to be solved by the device]

 In both of the above-mentioned prior arts, the heights of the long ladder side and the fulcrum side can be adjusted by extending and contracting the fulcrum, but it may be difficult to install in a place where irregularities are complicated. When installing in a place where the left and right heights are different, adjusting the length of only the supporting legs will cause the horizontal rail on the long ladder side to tilt, and it will become unstable when the user steps on the horizontal rail and goes up and down. There was a risk of becoming. Further, in the conventional one in which the length of the lower pipe or the like is adjusted by a fastener or the like, the adjustment work is complicated.

Therefore, an object of the present invention is to provide a tripod ladder in which leg lengths can be easily adjusted and which is excellent in lifting and lowering safety.

[0005]

[Means for Solving the Problems]

 According to a first aspect of the present invention, in a tripod ladder in which a supporting leg is provided so as to face a long ladder having a pair of left and right front legs, an auxiliary leg is movably inserted into at least one lower end of the front leg and the auxiliary leg is provided. Is provided between the upper and lower plates, and a U-shaped frame provided with upper and lower plates for inserting the auxiliary legs above and below the side plate. A tilt locking plate having a locking hole for loosely inserting the stopper, a stopper provided on the inner surface of the side plate, with which one upper surface of the tilt locking plate can come into contact, and between the tilt locking plate and the lower plate. And a bullet for biasing the tilting locking piece upward to press the corner portion of the locking hole against the auxiliary leg, and fixing the upper plate to the lower end of the front leg. is there .

Further, in the invention of claim 2, in a tripod ladder in which a supporting leg is provided facing a long ladder having a pair of left and right front legs, an auxiliary leg that can move back and forth is arranged along at least one of the front legs. A fixture for fixing the auxiliary leg is provided, and the fixture is provided between the upper and lower plates and a U-shaped frame provided with upper and lower plates for inserting the auxiliary leg above and below a side plate. A tilt locking plate having a locking hole for loosely inserting a leg, a stopper provided on the inner surface of the side plate and capable of contacting one side upper surface of the tilt locking plate, and the tilt locking plate and the lower plate. And an ammunition machine which is provided between the plates and urges the tilting locking piece upward to press the corner portion of the locking hole against the auxiliary leg, and the U-shaped frame is fixed to the outer periphery of the front leg. It will be.

[0007]

[Action]

 According to the structure of claim 1, the plurality of tilt locking plates biased upward by the ammunition are tilted by the upper surface of one side thereof contacting the stopper, and the tilt locking plates are formed with the locking holes. The corners are pressed against the outer surface of the auxiliary leg in a wedge shape, which fixes the auxiliary leg in the U-shaped frame. When the other side of the tilting plate is pushed down against the ammunition, the pressure contact state is released, and the auxiliary leg can be moved up and down.

According to the structure of claim 2, the auxiliary leg can be attached to the outside of the front leg without inserting the auxiliary leg into the front leg.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 4 show a first embodiment of the present invention, in which a long ladder 1 made of aluminum or the like is provided with a plurality of horizontal rails 3 between a pair of left and right front legs 2 and 2, and the front legs thereof are provided. 2 is formed from a hollow pipe. An upper part of the support leg 4 made of aluminum or the like is connected to the upper horizontal rail 3 of the long ladder 1. In this connection, the turning pipe 5 is rotatably fitted on the upper horizontal rail 3 and the intermediate pipe 6 orthogonal to the turning pipe 5 is fixed to the lower part of the turning pipe 5. An upper portion of the support leg 4 is fixed orthogonally to a base end of a mounting pipe 7 rotatably inserted in the intermediate pipe 6. Further, a large-diameter retaining portion 8 is fixed to the tip of the mounting pipe 7 so as to come into contact with the end face of the intermediate pipe 6 to prevent the retaining. The support leg 4 can be rotated in the vertical direction by the rotation of the rotation pipe 5, and the support leg 4 can be rotated in the left and right directions by the lower insertion pipe 7 inserted into the intermediate pipe 6.

Further, an auxiliary leg 11 made of aluminum or the like is inserted into the lower ends of the front leg 2 and the support leg 4 so as to be able to move back and forth, and the auxiliary leg 11 is attached to the front leg 2 and the front leg 2 via a fixture 12 made of aluminum or the like. The position is fixed to the supporting leg 4. As shown in FIG. 4, the fixture 12 has a U-shaped frame 13, which is formed by bending an upper plate 15 and a lower plate 16 above and below a side plate 14. The upper surface of the upper plate 15 is fixed to the lower ends of the front leg 2 and the support leg 4, and the upper and lower plates 14 and 15 are provided with circular upper and lower holes 15A and 16A through which the auxiliary leg 11 can be inserted. Has been drilled. A plurality of tilt locking plates 17 are arranged between the upper and lower plates 15 and 16, and the tilt locking plates 17 have a width substantially equal to that of the side plate 14 and the upper and lower plates 15 are provided. , 16 and is formed in a length longer than that of the tilting locking plate 17, and has a circular locking hole 18 into which the auxiliary leg 11 is loosely inserted at a position where one side edge thereof is substantially along the inner surface 14A of the side plate 14. Has been drilled. In the figure, 18A is a lower corner of one side of the locking hole 18, and 18A is an upper corner of the other side. Further, a stopper 19 made of a round bar or the like is fixed to the inner surface 14A of the side plate 14 in the width direction of the side plate 14, and the stopper 19 is in line contact with one upper surface of the uppermost tilt locking plate 17. Abut. The stopper 19 has a length substantially equal to the width of the side plate 14, and is fixed to the inner surface 14A of the side plate 14 by a fixing portion 19A by welding or the like. Furthermore, a coil spring 20 which is an ammunition is provided outside the auxiliary leg 11 between the lowermost tilt locking plate 17 and the lower plate 16, and the coil spring 20 is used for the plurality of tilt members. The stop plate 17 is biased upward. Reference numeral 21 in the figure is a substantially L-shaped grounding member fixed to the lower end of the auxiliary leg 11.

Next, the operation of the above configuration will be described. First, the position fixing state of the auxiliary leg 11 will be described. As shown in FIG. 4, the plurality of tilt locking plates 17 biased upward by the coil spring 20 have one upper surface thereof abutting the stopper 19. The tilted locking plate 17 has one lower corner 18A and the other upper corner 18B pressed against the outer surface of the auxiliary leg 11 in a wedge shape. In this state, the U-shaped frame 13 and the front leg 2 When a force is applied from above via the support leg 4 and the support leg 4, all this force is applied to only one upper surface of the tilt locking plate 17 via the stopper 19, and the tilt locking plate 17 is further rotated in a direction inclining the tilt locking plate 17. Works, and both corners 18A and 18B bite into the auxiliary leg 11 to increase the fixing force. When the auxiliary leg 11 is moved back and forth, the tilt locking plate 17 is attached to the auxiliary leg 11 by pushing down the other side upper surface of the tilt locking plate 17 as shown by the white arrow in FIG. On the other hand, if it is made horizontal, the above pressure contact state is released and the auxiliary leg 11 can be moved up and down. On the other hand, when the auxiliary leg 11 is extended, pulling it down while holding the auxiliary leg 11 causes the coil spring 20 to slightly contract due to the pressure contact resistance of the one side lower corner portion 18A and the other side upper corner portion 18B to the auxiliary leg 11. However, since the tilt locking plate 17 rotates slightly in the direction to release the pressure contact state, that is, in the horizontal direction, the auxiliary leg 17 can be pulled down. When an upward force is applied to the lower plate 16 of the frame 13, this force is transmitted to the tilt locking plate 17 only via the coil spring 20, and the elastic coil spring 20 contracts slightly, so that both angle Since the portions 18A and 18B slide without biting into the outer surface of the auxiliary leg 11, the auxiliary leg 11 can be pulled down.

As described above, in this embodiment, in the tripod ladder in which the supporting leg 4 is provided so as to face the long ladder 1 having the pair of left and right front legs 2 and 2, the auxiliary leg 11 is provided at the lower end of at least one of the front legs 2 and 2. And a fixture 12 for fixing the auxiliary leg 11 in position. The fixture 12 has upper and lower plates 15 and 16 for inserting the auxiliary leg 11 above and below the side plate 14, respectively. A U-shaped frame 13, a tilting locking plate 17 provided between the upper and lower plates 15 and 16 and having a locking hole 18 for loosely inserting the auxiliary leg 11, and a tilting locking plate 17 provided on the inner surface 14A of the side plate 14 for tilting. A stopper 19 with which the upper surface of one side of the locking plate 17 can abut, and the tilt locking plate 17 and the lower plate 16 are provided, and the tilt locking piece 17 is biased upward to lock the hole. Since the upper part 15 is fixed to the lower end of the front leg 2 with the coil spring 20 as an elastic body for pressing the corners 18A and 18B of the 18 to the auxiliary leg 11, the tilting locking of the fixture 12 is performed. The length of the auxiliary leg 11 can be easily adjusted by operating 17 and the position can be fixed, and at least one length of the front leg 2 can be adjusted by the fixing tool 12, so that even when the unevenness is complicated, the cross rail is crossed. 3 can be installed horizontally, which allows the user to safely ascend and descend, and work in an ascended state can be carried out safely with reasonable posture.

Further, as an effect of the embodiment, by using a plurality of tilt locking plates 17 for the fixing tool 12, the corner portions 18A and 18B of the plurality of tilt locking plates 17 of the auxiliary leg 11 are formed. It acts like a wedge on the outer surface, and a strong fixed state can be obtained.

5 and 6 show a second embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The pair of left and right front legs 2A, 2A are curved so that the distance between the front legs 2A, 2A expands downward, and at the upper part of the long ladder 1, a flat portion 31 is integrally provided. A rotary pipe 32 is rotatably fitted on the rear horizontal rail 3A, and the upper portion of the support leg 4 is fixed to the rotary pipe 32 so that the long ladder 1 and the support leg 4 can be freely opened.

Further, in this example, the fixing tool 12 is provided on the outer circumference of the lower portion of the front leg 2A, and the fixing tool 12 fixes the outer surface of the side plate 14 of the U-shaped frame 13 to the outer circumference of the front leg 2A. Then, similarly to the first embodiment, the tilt locking plate 17 of the fixture 12 can be operated to adjust the length of the auxiliary leg 11 and fix it.

As described above, in the present embodiment, in the tripod type ladder in which the supporting leg 4 is provided so as to face the long ladder 1 having the pair of left and right front legs 2A, 2A, it is possible to move back and forth along at least one of the front legs 2A, 2A. The auxiliary leg 11 is arranged, and a fixing tool 12 for fixing the auxiliary leg 11 in position is provided. The fixing tool 12 has upper and lower plates 15 and 16 for inserting the auxiliary leg 11 above and below the side plate 14, respectively. The tilt frame 17 is provided between the upper and lower plates 15 and 16 and the tilt lock plate 17 provided with a lock hole 18 for loosely inserting the auxiliary leg 11, and is provided on the inner surface 14A of the side plate 14. A stopper 19 with which the upper surface on one side of the stop plate 17 can abut, and a tilt locking plate 17 and a lower plate 16 which are provided between the tilt locking plate 17 and the tilting locking plate 17 are urged upward to corner the locking hole 18. Since the U-shaped frame 13 is fixed to the outer periphery of the front leg 2 and is provided with the coil spring 20 as a bullet that presses the portions 18A and 18B against the auxiliary leg 11, the tilting member of the fixture 12 is fixed. It is possible to easily adjust the length and fix the position of the auxiliary leg 11 by operating the plate 17, and the horizontal rail 3 can be installed horizontally even in a place where the unevenness is complicated. As with the first embodiment. In this example, since the fixing tool 12 is fixed to the outer periphery of the front leg 2A, it is not necessary to insert the auxiliary leg 11 into the front leg 2A. For example, as shown in the embodiment, The front leg 2A that is curved and the front leg that is thinner than the auxiliary leg 11 can be provided with the auxiliary leg 11 that can move back and forth, and the legs of various tripod ladders can be configured to extend and retract.

7 to 9 show a third embodiment of the present invention, in which the same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. A modified example of a fixture of the auxiliary leg 11A provided on the support leg 4 is shown. As shown in FIGS. 7 and 9, the auxiliary leg 11A is inserted into the lower end of the support leg 4 so that the auxiliary leg 11A can move forward and backward. A plurality of through holes 41 are bored at equal intervals in the vertical direction, and an outer hole 42 is bored in the lower portion of the auxiliary leg 11A corresponding to the inner hole 41, and inserted into these inner holes 41, 42. A fixing pin 43 for fixing the supporting leg 11A is provided, and a ring portion 44 is integrally provided on the base end side of the fixing pin 43. A chain 45 having one end connected to the ring portion 44 is provided with a mounting portion 46. Is connected to the support leg 4, and a notch-shaped vertical groove 47 is formed at the tip of the fixing pin 43, and the base end side is inserted into this vertical groove 47. Retainer pieces 48 that location has been through a pivot 49 mounted rotatably on the fixed pin 43.

The front legs 2 and 2 operate the tilt locking plate 17 of the fixture 12 to adjust the length and fix the position of the auxiliary leg 11, while the supporting leg 4 moves the auxiliary leg 11A back and forth to move the inner hole. Adjust the length by fitting the outer hole 42 into 41, insert the fixing pin 43 into the inner and outer holes 41, 42 from the tip side of the retaining piece 48, and rotate the retaining piece 48 at the tip. Fix it. The rotation of the retaining piece 48 prevents the fixing pin 43 from coming out. On the other hand, when removing the fixing pin 43, the retaining piece 48 is rotated in the lengthwise direction of the fixing pin 43 to remove the fixing pin 43. Can be removed. As described above, also in this embodiment, the lengths of the front legs 2 and 2 can be easily adjusted by inserting the front legs 2 and 2 in such a manner that the front legs 2 and 2 can move back and forth, and by using the auxiliary leg 11 attached via the fixture 12. The operation and effect are similar to those of the first embodiment, and further, the supporting leg 4 can easily adjust the length and fix the auxiliary leg 11A by inserting and removing the fixing pin 43.

FIG. 10 shows a fourth embodiment of the present invention, in which the same parts as those in the above-mentioned embodiments are designated by the same reference numerals and detailed description thereof will be omitted. The auxiliary leg 11A is attached to the stepped support leg 4 shown by (4) through the fixing pin 43 shown in the third embodiment.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the number of tilt locking plates 17 can be appropriately selected. Is. Also, a leaf spring or the like can be used as an ammunition instead of the coil spring.

[0021]

[Effect of device]

 According to a first aspect of the present invention, in a tripod ladder in which a supporting leg is provided so as to face a long ladder having a pair of left and right front legs, an auxiliary leg is movably inserted into at least one lower end of the front leg, and the auxiliary leg is inserted. Is provided between the upper and lower plates, and a U-shaped frame provided with upper and lower plates for inserting the auxiliary legs above and below the side plate. A tilt locking plate having a locking hole for loosely inserting the stopper, a stopper provided on the inner surface of the side plate, with which one upper surface of the tilt locking plate can come into contact, and between the tilt locking plate and the lower plate. And a bullet for biasing the tilting locking piece upward to press the corner portion of the locking hole against the auxiliary leg, and fixing the upper plate to the lower end of the front leg. Yes, it is possible to provide a tripod ladder with easy leg length adjustment and excellent lift safety.

According to a second aspect of the present invention, in a tripod ladder in which a supporting leg is provided so as to face a long ladder having a pair of left and right front legs, an advancing / retreating auxiliary leg is arranged along at least one of the front legs. A fixture for fixing the auxiliary leg in position is provided, and the fixture is provided between the upper and lower plates and a U-shaped frame having upper and lower plates for inserting the auxiliary leg above and below the side plate. A tilt locking plate having a locking hole for loosely inserting the auxiliary leg, a stopper provided on the inner surface of the side plate, with which one upper surface of the tilt locking plate can come into contact, the tilt locking plate and the lower part. And an armor which is provided between the plates and presses the tilting locking piece upward to press the corner portion of the locking hole against the auxiliary leg. The U-shaped frame is fixed to the outer periphery of the front leg. The auxiliary leg can be attached regardless of the shape of the leg, the leg length can be easily adjusted, and the lifting and lowering is safe. It is possible to provide a tripod type ladder having excellent properties.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 3 is a front view showing a first embodiment of the present invention.

FIG. 4 is a partially enlarged cross-sectional view of a fixture showing a first embodiment of the present invention.

FIG. 5 is a perspective view showing a second embodiment of the present invention.

FIG. 6 is a front view showing a second embodiment of the present invention.

FIG. 7 is a perspective view showing a third embodiment of the present invention.

FIG. 8 is a sectional view of a supporting leg showing a third embodiment of the present invention.

FIG. 9 is a perspective view of a fixing pin showing a third embodiment of the present invention.

FIG. 10 is a perspective view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Long ladder 2 Front leg 4 Support leg 11 Auxiliary leg 13 U-shaped frame 14 Side plate 14A Inner surface 15 Upper plate 16 Lower plate 17 Tilt locking plate 18 Locking hole 18A Lower corner of one side 18B Upper corner of the other side 19 Stopper 20 Coil spring

Claims (2)

[Scope of utility model registration request] 1. A tripod ladder in which a supporting leg is provided so as to face a long ladder having a pair of left and right front legs, an auxiliary leg is movably inserted into the lower end of at least one of the front legs, and the auxiliary leg is fixed in position. Is provided between the upper and lower plates and a U-shaped frame having upper and lower plates through which the auxiliary legs are inserted above and below a side plate, and the auxiliary legs are loosely inserted. A tilt locking plate having a locking hole formed therein, a stopper provided on the inner surface of the side plate and capable of contacting one side upper surface of the tilt locking plate, and provided between the tilt locking plate and the lower plate, A tripod comprising an ammunition for biasing the tilting locking piece upward to press the corner portion of the locking hole against the auxiliary leg, and fixing the upper plate to the lower end of the front leg. Type ladder. 2. A tripod ladder in which a supporting leg is provided so as to face a long ladder having a pair of left and right front legs, and an advancing / retreating auxiliary leg is arranged along at least one of the front legs, and the auxiliary leg is fixed in position. A fixture is provided, and the fixture is provided between the upper and lower plates and a U-shaped frame provided with upper and lower plates for inserting the auxiliary legs above and below a side plate, and a member for loosely inserting the auxiliary leg. A tilt locking plate having a stop hole, a stopper provided on the inner surface of the side plate and capable of contacting one side upper surface of the tilt locking plate; and a stopper provided between the tilt locking plate and the lower plate, A tripod comprising an ammunition for biasing the tilting locking piece upward to press the corner portion of the locking hole against the auxiliary leg, and fixing the U-shaped frame to the outer periphery of the front leg. ladder.