JP3004412U - Folding ladder joint device - Google Patents

Abstract

(57) [Abstract] [Purpose] A foldable type that prevents the ladder from becoming unusable due to damage to parts by installing multiple fitting stop structures at predetermined positions in each joint, and simplifies and makes the parts easier to manufacture. To provide a ladder joint device. [Structure] In a joint device used for a folding ladder, an outer shell body combination 1 and an inner shell body combination 2 are rotatably attached by rivets 10. The inner shell combination 2 has three small arc grooves 24 in the circumferential direction, and the smooth columns 8 are inserted into these small arc grooves 24. The slide blocks 3 attached to the outer shell combination 1 are fitted into the positioning recesses 231, 232, 233 provided radially outward of the small arc groove 24. Trigger 7
3 is rotated counterclockwise in FIG. 3, the tip portion of the trigger 7 pushes down the slide block 3 against the spring 5 and pushes the smooth column 8, and the outer shell combination 1 and the inner shell combination 2
The rotation position of and can be changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improved joint structure for a folding ladder, and more specifically, a simplification and improvement of a mechanism for locking and fixing a joint structure of a folding ladder.

[0002]

[Prior art]

 Ladder is an indispensable auxiliary equipment when working at height. The light metal folding ladders that are currently on the market are light and adjustable, and the folding angle is convenient. This lightweight metal folding ladder was able to have these characteristics because of the joints attached to it. Therefore, joint application is an extremely important technology for folding ladders.

There are quite a lot of patent documents on the improvement of the structure of the joint of the folding ladder, but the technique to which the structure having the fitting and positioning function is applied is a technique of utilizing the structure of the slide part and the fitting part to make the ladder fast. Opening and closing and positioning operations are being performed. Analyzing the joint structures of the folding ladder disclosed in these prior arts, the same function can be achieved by changing the structures of the transition slide part and the fitting stop part.

[0004]

[Problems to be solved by the device]

 A common drawback of these prior arts is that the anti-lock structure is composed of the related parts into an integral structural unit so that if some parts in the structural unit lose function, the anti-lock And the joints of the folding ladder completely lose their function. In other words, the folding ladder cannot be used. Another drawback of some of the prior art is that it is not only difficult to manufacture, because the parts are too complex and the overall non-fitting structural unit is made up of quite many parts. Opportunities to lose parts also increase.

An object of the present invention is to fold a plurality of fitting preventing structures at predetermined positions in each joint so as to prevent the ladder from being unusable due to damage to the parts and simplifying the parts to facilitate manufacturing. An object of the present invention is to provide an articulation device for a floating ladder.

[0006]

[Means for Solving the Problems]

 The structure for improving the joint of the folding ladder according to the present invention to solve the above-mentioned problems includes an outer shell combination, an inner shell combination, a slide combination, a trigger, a plurality of smooth columns, a plurality of springs, a shell positioning rivet and A trigger positioning rivet, the outer shell combination is composed of an outer shell upper plate and an outer shell lower plate, and the inner shell combination is composed of an inner shell upper plate and an inner shell lower plate, The slide combination comprises a slide block, a slide block seat, a spring pin and a spring, the shell positioning rivet is rotatably attached to the outer shell combination and the inner shell combination, and the trigger positioning rivet is Each smooth column is attached to a predetermined position of the outer shell combination so that the trigger can be turned, and radially inside the plurality of positioning recesses formed on the inner shell upper plate and the inner shell lower plate. A plurality of small arc grooves are provided, and the disk shape of the inner shell upper plate and the inner shell lower plate is below each small arc groove of one of the inner shell upper plate and the inner shell lower plate. A fixed seat plate is provided that extends vertically and inwardly from the upper plate, and both ends of the plurality of springs are hooked on the intermediate portions of the fixed seat plate and the smooth columns, respectively, and both ends of the smooth column are attached to the top end of the trigger. A lower concave arcuate end is provided, one of which is made slightly higher so that it can slide on it, and an outer convex arcuate end for pushing the slide combination near the lower concave arcuate end of the top end of the trigger. Is provided.

The plurality of springs are plate-shaped C-shaped springs. The diameter of the middle portion of the smooth column is made larger than that of both ends, and the length of the large diameter portion is made shorter than the distance between the inner surfaces of the disk-shaped upper plate of the inner shell combination. . The slide combination is mounted on the outer shell combination.

[0008] When the outer convex arcuate end of the trigger top pushes the slide block away from any of the positioning recesses of the inner shell combination, a plurality of smooth contacting lower concave arcuate ends of the trigger top. Push one of the pillars up into one of the multiple arcuate grooves and over a little higher on one side of the bottom concave arcuate end into one of the multiple springs that returns it to its original position. It is characterized in that it is bounced back, so that both ends of the upper part of the trigger are restrained by the slide block and the smooth column, respectively, and are formed at a large angle with one side of the outer shell combination.

[0009]

[Action]

 According to the joint device of the folding ladder of the present invention, the tip of the trigger hits each slide combination and each smooth column, and the restoring force of each spring pulls the trigger to combine the outer shell and the inner shell. By fitting the relative rotation of the, it is possible to perform the fitting operation of opening and closing.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. An embodiment of the present invention is shown in FIGS. First, the structure of each part of the joint of the present invention and the related combined state will be described with reference to FIG.

The structure for improving the joints of the folding ladder is shown in FIG. 2 as an outer shell body combination 1, an inner shell body combination 2, a slide block 3, a slide block seat 4, a spring 5, a spring pin 6, a trigger 7. It is composed of three smooth columns 8, three C-shaped springs 9, a shell positioning rivet 10 and a trigger positioning rivet 74. The outer shell combination 1 is composed of an outer shell upper plate 11 and an outer shell lower plate 12, and its outer shape is basically similar to that of the prior art outer shell. The upper part of the outer shell upper plate 11 and the outer shell lower plate 12 are formed in a disk shape, and the lower part is formed in a hollow rectangle, and slide grooves 13 are provided at predetermined intermediate positions, respectively. The slide grooves 13 face each other and are aligned in the radial direction of the upper disc portion. The outer shell upper plate 11 and the outer shell lower plate 12 are provided with central holes in the upper center thereof, respectively, so that they are rotatably attached to the inner shell plates 21 and 22.

Trigger positioning holes 16 are provided at opposing positions inside the middle portion of the outer shell upper plate 11 and the outer shell lower plate 12, respectively, whereby the trigger 7 is attached to the positioning hole 16 so as to be rotatable. To be Two coupling holes are provided at predetermined positions below the outer shell upper plate 11 and the outer shell lower plate 12 so as to face each other, and the outer shell upper plate 11 and the outer shell lower plate 12 are provided by rivets or the like not shown. And the folding ladder is fixed.

The outer shell lower plate 12 is provided with an angled spring seat 14, and the spring seat 14 is arranged at a predetermined lower position along the longitudinal direction of the slide groove 13. A pin hole 141 is provided in the central portion of the plate surface of the spring seat 14 and when the outer shell upper plate 11 and the outer shell lower plate 12 are integrally combined, the spring seat 14 is located on the outer shell body. Since the pin hole 141 is located in the space between the plate 11 and the outer shell lower plate 12, and the lower end of the spring pin 6 is inserted into the pin hole 141, The flange pin 6 can push the slide block 3 in a balanced manner.

Further, when the outer shell upper plate 11 and the outer shell lower plate 12 are integrally combined, a hollow portion is formed in the upper portion thereof, and the inner shell combination 2 is inserted therein. The inner shell combination 2 is composed of an inner shell upper plate 21 and an inner shell lower plate 22, and the outer shapes of both are basically similar to those of the prior art inner shell plate. Three positioning recesses 231, 232 and 233 for accommodating the slide block 3 are provided at the disc-shaped upper end edges of the inner shell upper plate 21 and the inner shell lower plate 22. The lower edge is provided with a mating part that is perpendicular to the disk-shaped surface and is opposed to each other. Small arc grooves 24 for accommodating both ends of each smooth column 8 are provided near the lower ends of the respective positioning recesses 231, 232, 233. Further, near the lower end of each small arc groove 24 of the inner shell upper plate 21 in the counterclockwise direction, one end of each C-shaped spring 9 is hooked to each fixed seat 25, and a tongue perpendicular to the disk-shaped surface is formed. A shape fixing seat 25 is provided. Further, one end of the C-shaped spring 9 is hooked on the intermediate portion of each smooth column 8.

A central hole that is aligned with the central holes of the outer shells 11 and 12 is provided in the upper center of each of the inner shell upper plate 21 and the inner shell lower plate 22, and the shell positioning rivet is provided in this central hole. After passing through 10, the outer shell combination 1 and the inner shell combination 2 are rotatably connected. In addition, since two opposing coupling holes are provided at predetermined positions below the inner shell upper plate 21 and the inner shell lower plate 22, the inner shell upper plate 21 and the inner shell lower plate 22 are After mating, they are fixed to the folding ladder with rivets.

The slide block 3 has a rectangular block shape, and both ends in the long side direction are arranged in the slide grooves 13 on the outer shell upper plate 11 and the outer shell lower plate 12. A blind hole used for inserting the top end of the spring pin 6 is provided at the center of the bottom of the slide block 3. Since the thickness of the slide block 3 is slightly narrower than the width of the positioning recesses 231, 232, 233 on the slide groove 13 and the inner shell upper plate 21 and the inner shell lower plate 22, the slide block 3 slides on the slide groove 13. Can be slid and fitted into the positioning recesses 231, 232, 233. Further, since the height of the slide block 3 is higher than the height of the positioning recesses 231, 232, 233, the slide block seat 4 properly supports the lower side of the slide block 3 and is provided around the upper portion of the inner shell combination 2. Not hit

The slide block seat 4 is basically a U-shaped plate body, both ends of the top part of which extend horizontally outward, and the width of the recessed portion is slightly wider than the thickness of the slide block 3 and is high. The length and length are lower than the slide block 3. Since a hole is provided at the center of the bottom, the slide block 3 can be stably supported, and the operation to fit the positioning recesses 231, 232 and 233 smoothly can be performed.

A large diameter portion is provided on the upper portion of the spring pin 6. Therefore, the lower part of the spring pin 6 is inserted into the spring 5, the top end is inserted into the bottom central hole of the slide block seat 4, and the bottom end of the slide block 3 is inserted into the central blind hole, and the bottom end is inserted into the outer shell lower plate. 12 through the pin hole 141 of the spring seat 14, the top end of the spring 5 abuts the bottom surface of the large diameter portion of the spring pin 6 and the bottom end of the spring 5 abuts the top surface of the spring seat 14 to cause the slide block. 3 can slide under a biased pressure between the slide grooves 13.

The upper part of the trigger 7 is composed of two parallel and symmetrical plates, and the lower part thereof is a bent plate. A pair of trigger positioning holes 73 are provided facing each other at a position near the middle portion of the trigger 7. When assembling the trigger 7, the trigger positioning hole 73 is aligned with the relative trigger position determining hole 16 on the outer shell combination 1, and the trigger 7 is moved by the trigger positioning rivet 74 to the outer shell upper plate 11 and the outer shell lower plate. It is mounted rotatably between 12 pieces. In this case, the upper parts of the two plates of the trigger 7 are placed outside the inner shell assembly 2 so that the slide block 3 and the smooth column 8 can be held.

The tops of the two plates of the trigger 7 are formed to have a concave shape in the middle, a slightly higher outer convex arc-shaped end 71 is formed at the tip, and a lower end protruding slightly rearward from the tip. It is formed at the concave arc end 72. When the slide block 3 is fitted in one of the positioning recesses 231, 232, 233, the lower part of the trigger 7 can be pushed and moved in an appropriate direction, and the outer convex arcuate end 72 and the lower part 72 can be moved. The concave arc-shaped end 71 performs an operation of pushing the both ends of the slide block 3 and the smooth column 8 to separate the slide block 3 from the positioning concave portion 231, 232 or 233.

The smooth column 8 is basically cylindrical, and its length is wider than the width of the upper part of the inner shell combination 2, but smaller than the interval between both inner side surfaces of the upper part of the outer shell combination 1. The diameter of the middle portion of the cylindrical body 8 is slightly large, but the diameter of the other portion that encloses both ends is formed to be equal to or slightly smaller than the width of each small arc groove 24 in the inner shell combination 2. As a result, both ends of each smooth column 8 are fitted into the opposing small arc grooves 24, and can be projected to the outside of the inner shell combination 2. Further, since the length of the large diameter portion of the intermediate portion of each smooth column 8 is substantially equal to the distance between both inner side surfaces of the upper portion of the inner shell combination 2, each smooth column 8 is fitted into the small arc groove 24. If it happens, do not drop it from the inner shell combination 2. Further, since the lengths of both ends of each smooth column 8 protruding to both sides of the inner shell combination 2 are equal, the two plates of the trigger 7 can push the both ends, respectively, and the operation of the fitting stop can be performed. It will be possible.

The C-shaped spring 9 is composed of a spring plate having an appropriate thickness, and its cross-sectional width is substantially equal to the length of the large diameter portion of the middle portion of each smooth column 8. One end of each C-shaped spring 9 is hooked on the intermediate portion of each smooth column 8, and the other end is hooked on the fixed seat 25 of the inner shell lower plate 22. This allows each smooth post 8 to return to its original position if it is moved to the top end of the trigger 7.

Next, with reference to FIG. 2, FIG. 3 and FIG. 4, the joint fitting stopping operation and the joint releasing operation of the present invention will be described. FIG. 2 shows a state in which the slide block 3 is fitted in the positioning recess 231. In this figure, the outer shell upper plate 11 is removed. The slide block 3 is fitted in the positioning recess 231 by the biasing force of the spring 5. The outer convex arcuate end 72 of the trigger 7 is above the top surface of the slide block 3, and the lower concave arcuate end 71 is behind the smooth column 8 in the clockwise direction. When the folding ladder requires a large deployment angle, for example, the slide block 3 is detached from the positioning recess 231 which is currently in the fitting stop state, and is fixed to another positioning recess 232. In this case, when the lower part of the trigger 7 is pulled in the counterclockwise direction, the outer convex arcuate end 72 pushes the slide block 3 and slides the slide block 3 downward along the slide groove 13, and at the same time, the lower concave arc. The shaped end 71 presses the smooth column 8 and slides it upward from the state shown by the broken line in FIG. 3 along the small arc groove 24 as shown by the solid line. FIG. 3 mainly shows a state in which the slide block 3 is pressed by the outer convex arcuate end 72 and is separated from the original positioning recess 231.

At the same time, the smooth pillar 8 is returned to the original position where it is not urged by the C-shaped spring 9 hooked along the right side of the lower concave arc end 71 and is not pressed by the lower concave arc end 71. It returns and contacts the upper right side of the trigger 7. Since the outer convex arcuate end 72 on the upper part of the trigger 7 is biased by the spring 5 of the slide block 3, the lower part of the trigger 7 does not receive the force in the counterclockwise direction, but the slide block 3 does not move. The positioning recess 231 is maintained so that it does not stop. The top of the trigger 7 is pushed by the slide block 3 and the smooth column 8, respectively, so that the lower part of the trigger 7 and the inner part of the lower part of the outer shell combination 1 have a large opening angle. This opening angle is visually inspected by the user of the folding ladder so that the slide block 3 of the joint is not yet fitted in any of the positioning recesses 231, 232 and 233, so that the ladder cannot be lifted yet. You can easily detect that there is. In other words, the opening angle has the effect of giving a warning and notice that the user cannot climb quickly.

FIG. 4 shows a state in which the outer shell combination 1 is rotated clockwise around the shell positioning rivet 10 as an axis, and the slide block 3 is separated from the positioning recess 231. At this time, the slide block 3 receives the action of the spring 5 and pushes the disk-shaped upper outer periphery of the inner shell combination 2. The outer convex arcuate end 72 of the trigger 7 is not pressed by the slide block 3 and is not in contact with the smooth column 8 and is in a loose state.

In order to fit the slide block 3 into the positioning recess 232 adjacent to the positioning recess 231, the outer shell combination 1 is continuously rotated clockwise so that the slide block 3 is positioned in the positioning recess 232. When it reaches the position, the slide block 3 is pushed into the positioning recess 232 by the urging force of the spring 5. When the slide block 3 is fitted from the positioning recess 231 over the positioning recess 232 and fixed in the positioning recess 233, when the outer shell combination 1 passes over the second positioning recess 232, the lower part of the trigger 7 is rotated clockwise. The outer shell body combination 1 is rotated counterclockwise while pressing the slide block 3 so that the outer convex arcuate end 72 is not fitted into the positioning recess 232 by pushing, and the slide block 3 passes the positioning recess 232. After that, release the pressure of the trigger 7. Then, when the outer shell combination 1 is further rotated in the clockwise direction, when the slide block 3 reaches the positioning recess 233, it is fitted into the positioning recess 233 by the biasing force of the spring 5. In this order, when the folding ladder is unfolded, the fitting and separation operations between the outer shell body combination 1 and the inner shell body combination 2 are performed.

When the ladder is folded, that is, when the outer shell combination 1 and the inner shell combination 2 of the joint are rotated so as to overlap with each other, first, as shown in FIG. 3, the lower portion of the trigger 7 is counterclocked. The outer shell body combination 1 is turned counterclockwise by turning the slide block 3 away from the positioning recess 233. In this case, when the slide block 3 passes through the positioning recess 232 and the positioning recess 231, the lower concave arc end 71 of the trigger 7 is restrained by the smooth column 8 in the small arc groove 24 and the outer convex arc end 72 respectively. Since the slide block 3 presses the slide block 3, the outer shell combination 1 smoothly rotates counterclockwise without being fitted into the positioning recess 232 and the positioning recess 231, and the outer shell combination 1 and the inner shell are combined. The body combination 2 reaches the facing position.

As described above, according to the structure and operation of the above-described embodiment, each small arc groove 24 of each inner shell combination 2, each smooth column 8, each fixed seat 25, each C-shaped spring 9, and the top of the trigger 7. The outer convex arcuate end 72 and the lower concave arcuate end 71 in FIG. 2 play a very important investment when the slide block 3 is fitted into or disengaged from the positioning recess 231, 232, or 233. It can be seen that the anti-locking components that play these extremely important roles are considerably simplified as compared with those of the prior art anti-locking mechanisms. Further, since the small arc groove 24 and the smooth column 8 each having a pressing mechanism are installed below the positioning recesses 231, 232, 233, the slide block 3 and the positioning recesses 231, 232, and The locking and unmating of 233 are independent of each other, and even if the C-shaped spring 9 loses its function or the smooth column 8 is locked and cannot be fixed, the slide block 3 in one positioning recess is locked. Alternatively, it only affects the function of detaching, and does not lose the function of stopping or fitting the slide block 3 at another place. Also in this respect, since the anti-lock mechanism of the prior art is concentrated on the anti-lock mechanism unit, if the parts in the anti-lock unit lose their functions or are damaged, the slide block cannot be completely locked. In comparison, the joint of the present invention certainly has the advantage of having better utility.

That is, the feature that the joint-improving structure of the folding ladder of the present invention emphasizes is simplification and a combination of independent fitting parts. Its features are certainly not present in each prior art and have the property of promoting the creativity and function of the structure.

[0030]

According to the folding ladder articulating device of the present invention, the upper part of the trigger is pressed against each slide combination and the smooth column, and the elastic force of the spring pulls the trigger to form an outer shell pair combination and an inner shell. Since the fitting function of opening and closing can be performed simply by matching the relative rotation of the body combination, it is possible to reduce the number of parts and prevent the ladder from being unusable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a joint device of a folding ladder according to an embodiment of the present invention.

FIG. 2 is a side view for explaining the operation of the joint device shown in FIG.

FIG. 3 is a side view for explaining the operation of the joint device shown in FIG.

FIG. 4 is a side view for explaining the operation of the joint device shown in FIG.

[Explanation of symbols]

 1 Outer shell combination 2 Inner shell combination 3 Slide block 4 Slide block seat 5 Spring 6 Spring pin 7 Trigger 8 Smooth column 9 C-shaped spring 10 Shell positioning rivet 74 Trigger positioning rivet

Claims (5)

[Scope of utility model registration request] 1. An outer shell combination, an inner shell combination, a slide combination, a trigger, a plurality of smooth columns, a plurality of springs, a shell positioning rivet and a trigger positioning rivet, wherein the outer shell combination is an outer shell. The inner shell body combination is composed of an inner shell body upper plate and an inner shell body lower plate, and the slide combination is composed of a slide block, a slide block seat, a spring pin and a spring. The shell positioning rivet is rotatably attached to the outer shell combination and the inner shell combination, and the trigger positioning rivet is attached to a predetermined position of the outer shell combination so that a trigger can be turned. A plurality of small arc grooves on which the smooth columns are bridged are provided radially inward of the plurality of positioning recesses formed in the upper body plate and the inner shell lower plate. A fixed seat plate that extends vertically and inwardly from the inner shell upper plate and the disc-shaped upper plate of the inner shell lower plate is provided on the lower side of each of the small arc grooves of the shell lower plate. Both ends of the spring are hooked on the intermediate part of the fixed seat plate and each smooth column, and the lower end of the trigger has a lower concave arc-shaped end on which one end is slightly slidable so that both ends of the column can slide on it. And an outer convex arcuate end for pushing a slide combination near the lower concave arcuate end of the top end of the trigger. 2. The joint device for a folding ladder according to claim 1, wherein the plurality of springs are plate-shaped C-shaped springs. 3. The diameter of the middle portion of the smooth column is made larger than both ends thereof, and the length of the large diameter portion is made shorter than the distance between the inner surfaces of the disk-shaped upper plate of the inner shell combination. The folding ladder joint device according to claim 1. 4. The foldable ladder articulation device of claim 1, wherein the slide combination is mounted on the outer shell combination. 5. A plurality of contacting lower concave arcuate ends of the trigger top when the outer convex arcuate end of the trigger top pushes the slide block away from any of the positioning recesses of the inner shell combination. Push one of the smooth columns up into one of the multiple arcuate grooves and over a little higher on one side of the bottom concave arcuate end, in one of the multiple springs, where it was in its original position. The joints of a folding ladder characterized in that both ends of the upper part of the trigger are restrained by the slide block and the smooth column, respectively, and are formed at a large angle with one side of the outer shell combination. apparatus.