JP2017160766A - Balance cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balance cap easily installable even in a ladder of two legs by changing a size, and capable of adjusting vertical slide operation in a mm unit, and capable of respectively landing four legs in a well-balanced state even on a low irregular ground surface.SOLUTION: An aluminum step ladder column part of four legs is made in a similar type quadrangular pyramidal slide system as a prototype so as to wrap in an outer diameter quadrangular surface of its column part. In a balance cap for preventing lateral run-out of a step ladder, the length 50 mm is cut from a column right leg tip part of the step ladder, and a base shaft hole of a diameter 10 mm is made in a central position of a 110 mm side surface from the cutting tip, and the balance cap and a column part of the step ladder mutually make slide motion with this base shaft hole as a fulcrum. The balance cap is mainly constituted of a slide case, a saw fixing ratchet tool, a knob bolt and a corotation preventive nut board.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a balance cap that is attached to the lower end of one of the columns of a stepladder to prevent lateral shaking of the stepladder.

  Traditionally, a stepladder has been designed to be used on a horizontal ground with two or four columns, but for various stepladders for stable use on a bumpy ground. There is an adjustment device. These are leg length adjusting devices for a stepladder by raising and lowering two legs or four legs, respectively (for example, see Patent Document 1). In addition, there is a work table with a stability adjusting device that allows the legs of the stepladder to slide up and down (see, for example, Patent Document 2). Moreover, the four leg height adjustment leg which can adjust four legs of a stepladder (for example, refer patent document 3). Or there exists a stepladder with an expansion-contraction structure (for example, refer patent document 4).

  JP 2005-61033 A,   Utility model registration No. 3077382,   JP 2013-87490 A,   JP-A-10-231694,

The conventional step length adjusting device for a stepladder described in Patent Document 1 is a mounting method that has many mounting parts and is complicated to handle, and has a form that cannot be attached to a commonly used ready-made stepladder. It is a device that can be attached only to a specific stepladder due to its complicated installation.

The work table with a stability adjusting device described in Patent Document 2 has a risk that the contact surface between the stability adjusting device and the fixing lever may become worn and slippery when a heavy load is applied to it or during long-term use. was there. In addition, the attachment to the general spread type stepladder has a problem in form.

The four-leg height-adjusting stepladder described in Patent Document 3 has four height-adjusting holes aligned with the space value of the floating leg in order to ground the four legs of the stepladder on uneven ground. The work of inserting the fixing bracket is difficult and time-consuming. For some reason, when the distance between the height adjustment holes is wide and the uneven ground is forcibly aligned with the adjustment holes, the leg of the stepladder may float in the air due to the reverse procedure. Also, the vertical alignment intervals of the height adjustment holes are slightly wide, and final fine adjustment of the height difference is difficult on low uneven ground. Three legs can easily land on uneven ground, but only one leg is always floating, and the adjustment holes are created at equal intervals for all four legs. If the distance between the height adjustment holes does not match, overall balance adjustment is difficult.

  The four-leg height adjustment stepladder described in Patent Document 3 combines the height adjustment hole with the space value of the floating leg in order to ground the four legs on the uneven ground. The work of inserting the book fixing brackets is difficult because it takes time and effort. For some reason, the distance between the height adjustment holes is wide, and if the uneven ground is forcibly aligned with the adjustment holes, the legs may float slightly in the air. Also, the vertical alignment intervals of the height adjustment holes are slightly wide, and final fine adjustment of the height difference is difficult on low uneven ground. Since the height adjustment holes are created at equal intervals on all four legs, if the ground space value of one leg does not match the interval value of the height adjustment hole, the entire four legs are bonded to the pitter at the same time. There is a risk of rattling.

This height-adjusting stepladder always has one leg floating in the air on the uneven ground that is lower than the height adjustment hole interval. If the ground contact surface of the stepladder is finely adjusted in millimeters and is not fixed, lateral blurring will occur in the left and right and front and rear, especially when working on a high place with a high stepladder may be dangerous. The four-leg height-adjusting stepladder seems to be designed with a cylindrical quadrangular pyramid, and the shape of the step is different from the popular aluminum stepladder where the column is designed with C-shaped steel. It cannot be installed.

The stepladder with a stretchable structure described in Patent Document 4 has a slightly wide gap between engagement grooves, and it is difficult to cope with fine adjustment in mm units. There is a risk that working at a high altitude may be dangerous due to a slight lateral movement. Since the compression spring is installed, the engaging claws cannot be removed easily even if the bundling bolts are loosened slightly, so it takes time and effort to extend and retract. Also, since the engaging claw is designed to pass under the tip of the support leg, when the telescopic leg is extended to the maximum, the contact surface with the support leg becomes very narrow and a heavy load is applied to the stepladder. In some cases, slack occurs and the stepladder becomes unstable. Further, the engaging claw is designed to engage with the engaging groove from the back surface of the support leg, and it takes a lot of time and effort to adjust each other's coalescence. Also, it is good to use the stepladder for a long time at a certain place, but it is inconvenient when it is used while moving constantly.

When the stepladder is used outdoors, the ground contact surface is not always horizontal.On stepped ground, the stepladder becomes unstable due to sideways blurring in the front, rear, left, and right. In order to stabilize, it is indispensable to help the assistant or to bite the plate unevenness in the bottom of the leg floating in the air. In any case, it takes a lot of time and effort.

The present invention is intended to solve the problems of such a conventional configuration, and can be easily attached to a general spread type stepladder or a used stepladder. In addition, it can be easily attached to the ladder by changing the size, and fine adjustment in mm units is possible even on low uneven ground. Therefore, the stability of the stepladder, safety, functionality, convenience, etc. are ensured. In addition, lateral blurring of the front, back, left, and right of the stepladder and rattling of the leg will stop after a few seconds of adjustment work, and the stepladder will be stable. Even with a high stepladder of 3 to 4 meters, stable safety is ensured by attaching and adjusting the balance cap.

The balance cap according to the present invention is a device that is attached to a support column of a stepladder composed of two legs or four legs, and is a base shaft provided at the lower end portion of the stepladder support column that is located on the right side from the front side of the stepladder. It slides up and down through the hole. A long hole was provided in the center of the long slide case having a channel cross section, and a number of saw teeth were formed along the side surface of the long hole. The saw blades provided in the long holes of the slide case and the saw tooth stoppers provided in the saw fixing pawls mesh with each other. The balance cap is mainly composed of a slide case, a saw-fixed pawl bolt, and an anti-rotation nut board, and its function is established depending on the combination with the stepladder strut. When handling the balance cap, set the slide case and the saw fixing pawl to the lower end of the right column of the stepladder. Next, temporarily fix the Noboru bolt, which is inserted through the base hole provided in the stepladder column, to the anti-rotation nut board, and adjust the slide case up and down in the temporarily fixed state. Stable landing on each leg of the stepladder At that time, the saw blade provided in the long hole of the slide case and the saw tooth stopper provided in the saw fixing tooth stopper are engaged with each other, the engagement portion is covered with the fixing tool, and tightened and fixed with the bolt of the fastener. .

As described above, the balance cap for preventing lateral shaking of the stepladder of the present invention can be easily attached to a two-legged ladder by changing the size. In addition, the vertical slide operation can be adjusted in mm units, and even with low uneven ground, the four legs can land stably with good balance. The inner surface of the square cap of the balance cap is created so as to wrap the outer diameter square surface of the stepladder strut, and when it is attached to the stepladder strut, adhesion to each other's contact surface is secured, so external impact And withstand lateral loads. One step of the stepladder A load test of 300 kg was performed step by step, and as a result, it was clear that there were no abnormalities such as damage and deformation of the balance cap parts and meshing parts. The balance cap wraps around the square surface of the stepladder strut, the close contact between each other, the coupling between the sawtooth of the slide case and the saw fixing of the saw fixing pawl, and the contact between the balance cap and the post of the stepladder It is possible to install it in a stable state by securing it in three places, such as tightness fixing with the bolts held down with a fixing tool. By attaching the balance cap to the stepladder and adjusting it, the work effect can be demonstrated safely and securely.

  It is a disassembled perspective view of the balance cap which shows embodiment of this invention.   Front view of the present invention in which a saw fixing tooth stopper is mounted on a slide case   Similarly, it is a rear view of the present invention.   Similarly, it is a plan view of the present invention   Saw fixed pawl, top view of the present invention   Similarly, it is a rear view of the present invention.   Slope view of the present invention showing the assembled state of the balance cap   Similarly, it is a front view   Similarly, it is a rear view   Similarly, it is a sectional view   The balance cap of the present invention attached to the tip of the stepladder strut   Similarly, it is a perspective view of a slide case attached to the tip of a stepladder column.   Similarly, it is a slope view of the balance cap attached to the tip of the stepladder strut

Hereinafter, embodiments of a balance cap according to the present invention will be described with reference to FIGS.

As shown in FIG. 11, the balance cap according to the present invention is attached to any one of the stepladder struts 10 mainly composed of two legs or four legs made of aluminum, and prevents lateral shaking of the stepladder. It is an instrument to do.

As shown in FIG. 1, this balance cap is composed of a slide case 1, a saw fixing pawl 12, a bolt 5 and a rotation prevention nut board 6.

When attaching the balance cap to the stepladder 15, it is drilled in one of the stepladder struts 10, preferably on the lower side of the stepladder strut 10, which is preferably located on the right side from the front side, in order to facilitate operation and handling. It is attached via the base hole 11.

As shown in FIG. 1, the slide case 1 has a long shape of a cross-sectional channel and is provided with a long hole 7 having a number of saw teeth 8 in the central length direction of one surface thereof, and slides toward the lower end of the step column 10. It can be installed as possible.

The saw fixing tooth stopper 12 is formed by bonding and fixing the saw tooth stopper 2 to the fixing tool 3. The saw fixing tooth stopper 12 is attached to the back side of the slide case and meshed with the saw tooth 8 that is bored in the long hole 7 of the slide case 1. It is prepared so that both sides of the slide case 1 are provided so as to be in close contact with each other, and the function of this embodiment also serves to assist the accuracy during the meshing operation. Further, a handle 17 for adjusting the setting position of the meshing portion is provided.

The Noboru bolt 5 is positioned on the back surface of the stepladder column 10 through the base hole 11 in a state where the saw fixing tooth stopper 12 is set on the slide case 1 attached to the lower end of the stepladder column 10. Temporarily fix to 6 and land each leg of the stepladder 15 and tighten and fix it when lateral blurring or rattling stops and stabilizes.

The anti-rotation nut board 6 is bonded and fixed to the back surface of the stepladder column 10. As shown in FIG. 10, the nut is welded to the anti-rotation nut board 6 so as not to run idle when the head bolt 5 is tightened. It is fixed. Another operational role is to loosen the fastening bolt 5 and the saw teeth 8 are disengaged from each other, and the saw fixing tooth stopper 12 is also lifted, and a space is created on the contact surface with the slide case 1. As a result, there is no obstacle to contact with each other, and the sliding motion of the slide case 1 can be facilitated.

As shown in FIG. 1 or FIG. 13, the balance cap configured as described above is configured such that the slide case 1 with the anti-slip socks 9 is attached to the lower end of the stepladder column 10, and the saw fixing tooth stopper 12 is set on the slide case 1. To do. The washer 4 is fitted to the nose bolt 5, inserted into the base shaft hole 11 of the step column 10, temporarily fixed with the anti-rotation nut board 6, and in this temporarily fixed state, the slide case 1 is adjusted to move up and down. To stably land each leg of the stepladder 15. Next, the saw tooth stopper 2 provided in the saw fixing tooth stopper 12 is engaged with the saw tooth 8 provided in the long hole 7 of the slide case 1. The stable state of the stepladder 15 is confirmed and fastened with the bolt 5 to fix it.

  FIGS. 2 to 4 show a configuration in which the saw fixing pawl 12 is mounted on the slide case 1, and the saw pawl 2 provided in the long hole 7 of the slide case 1 and the saw fixing pawl 12. And the saw-fixed pawl 12 also covers the meshing portions of each other. The other role of the saw fixing pawl 12 is to hold the side of the slide case 1 so that the position of the meshing surface of the saw pawl 8 and the saw pawl 2 does not go wrong during slide adjustment. These operations are performed by the handle 17 of the fixture.

As shown in FIGS. 5 and 6, the saw fixing pawl 12 is obtained by adhering and fixing the saw pawl 2 to the fixture 3 by welding and further fastening and fixing with two screws 16. In addition, when the teeth of the saw-tooth stopper 2 protrude slightly upward from the edge of the fixture 3, the engagement between the saw-tooth 8 provided in the long hole 7 and the saw-tooth stopper 2 is instantly visually confirmed.

  FIG. 10 is a cross-sectional view of the balance cap, and the engagement portion between the saw tooth 8 provided in the long hole 7 of the slide case 1 and the saw tooth stopper 2 provided in the saw fixing tooth stopper 12 is covered with the fixing tool 3, and the upper part thereof is covered. The washer 4 holds it down. Further, the anti-rotation nut board 6 is adhered and fixed in accordance with the back side of the base shaft hole 11 of the step column 10, and its function is to release the fixing bolt 5 and loosen the tightening so that the saw blade 8 and the saw blade stopper 2 are used. At the same time, the meshing part is also loosened, the meshing is released, the contact surface is lifted, a space is created between them, and the sliding operation of the slide case 1 can be performed smoothly. Further, the wing claw 13 provided on the slide case 1 serves to hold the square surface of the stepladder support column 10 and at the same time, the slide case 1 wraps around the square surface of the stepladder support column 10. The backlash of the contact surface can be minimized. Therefore, during stepladder work, there is no lateral blurring and stability and safety are ensured.

FIG. 11 shows a balance cap attached to an aluminum stepladder post 10.

FIG. 12 shows the slide case 1 mounted on a stepladder post 10 that has been cut. The contact gap between each other is very small, and a hole for inserting the head bolt 5 is provided in the center of the lower end of the stepladder column 10 with the emphasis on adhesion and comfort in order to minimize lateral shaking and rattling of the stepladder. Let the hole be a base hole 11. The slide case 1 is slid up and down around the base hole 11 provided in the stepladder column 10.

FIG. 13 is a perspective view of the balance cap mounted on the stepladder column 10.

The slide case 1 is preferably made of an aluminum material of the same quality as the stepladder column 10 and is designed in the shape of a similar quadrangular pyramid that wraps around the square surface of the stepladder column 10 in order to ensure the strength and rationality of the processed material. Is. The slide case 1 is attached to the stepladder column 10, and the contact gap during sliding movement is made small, and the slide operation is made with emphasis on the adhesion and comfort of the slide operation.

When cutting the stepladder support column 10, the lower end of the stepladder support column 10 located on the right side from the front side is cut according to the length value of the long hole 11 provided in the slide case 1. Next, a base shaft hole is formed in the center position of the lower end of the stepladder column 10 so that the head bolt 5 can be inserted therethrough, and the sliding movement is performed with the base shaft hole 11 as a fulcrum. Moreover, the cutting time for the lower end of the stepladder column 10 and the work time until the creation and attachment of the base hole are completed in a few minutes.

The balance cap can be attached to a ready-made stepladder 15 made of aluminum or the like, and its role is a device for preventing the horizontal stepping and backlash of the stepladder 15. The size may change depending on the material and shape.

  For the safe handling of a four-legged aluminum stepladder, the maximum load mass applied to the entire stepladder is specified as 100 kg or less. In measuring the load on the balance cap, on October 20, 2017, the balance cap was attached to the stepladder column 10 and a load of 300 kg was applied to the stepping step 14 on one side of the stepladder 15. This proves that no deformation or damage occurred.

  It is description about the operation method of the balance cap of this invention with which the stepladder support | pillar 10 was mounted | worn. When the ground contact surface of the right leg or the diagonal line of the stepladder 15 is high, the leg on the left leg or the diagonal line floats and the stepladder 15 becomes unstable. In this case, the four legs stably land by sliding the slide case 1 upward by the space value where the left leg is lifted. When the lateral movement of the stepladder 15 stops, the sawtooth 8 provided in the elongated hole 7 of the slide case 1 and the sawtooth stopper 2 provided in the saw fixing tooth stopper 12 are engaged with each other, and are supplied through the base shaft hole 11. The adjustment bolt is fixed by tightening the bolt 5 that is temporarily fixed to the prevention nut board 6. Further, when the ground contact surface of the left leg or the diagonal line of the stepladder 15 is high, the leg on the right leg or the diagonal line floats and the stepladder 15 becomes unstable. In this case, the four legs stably land by sliding the slide case 1 downward by the space value where the right leg is lifted. When the lateral movement of the stepladder 15 stops, the saw blade 8 provided in the long hole 7 of the slide case 1 and the saw blade stopper 2 provided in the saw fixing tooth stopper 12 are engaged with each other to prevent the rotation through the base shaft hole 11. The bolt 5 that is temporarily fixed to the nut board 6 is tightened and fixed, and the adjustment work is completed. For example, when working at high places on uneven ground with poor environment. By attaching the balance cap to the stepladder 15 and sliding it up and down, the stepladder 15 can be prevented from lateral blurring and rattling, and the stepladder becomes stable in an instant.

DESCRIPTION OF SYMBOLS 1 Slide case 2 Saw-tooth stop 3 Fixing tool 4 Washer 5 Head bolt 6 Rotation prevention nut board 7 Elongated hole 8 provided in center part of slide case Saw tooth 9 Non-slip socks 10 Standing support column 11 Base hole 12 Saw fixing tooth stopper 13 Wing claw 14 provided in slide case Stepladder 15 Aluminum stepladder 16 Tightening screw 17 for fixing the saw tooth stopper to the fixing knob 17 Adjusting the meshing position Handle 18 Balance cap

Claims (2)

  The balance cap according to the present invention is a device attached to a stepladder strut composed of two legs or four legs, and is provided at the lower end of the stepladder strut positioned on the right side when viewed from the front side of the stepladder. It slides up and down through the base hole. A long hole was provided in the center of the long slide case having a channel cross section, and a number of saw teeth were formed along the side surface of the long hole. The saw blades provided in the long holes of the slide case and the saw tooth stoppers provided in the saw fixing pawls mesh with each other. The balance cap mainly consists of a slide case, a fixed bolt for the saw fixing pawl, and an anti-rotation nut board, and its function is established by the combination with the stepladder strut. When handling the balance cap, set the slide case and the saw fixing pawl to the lower end of the right column of the stepladder. Next, temporarily fix the Noboru bolt that is inserted through the base hole provided in the stepladder to the rotation prevention nut board, and adjust the slide case up and down in the temporarily fixed state. Each leg of the stepladder is stably landed. At this point, the saw blade provided in the long hole of the slide case is engaged with the saw tooth stopper provided in the saw fixing tooth stopper. . The balance cap according to claim 1, wherein a wing claw is provided on the slide case of the cross-sectional channel so as to wrap around the square surface of the stepladder column.