JP3041055U - A stepladder that imitates the unevenness of the ground surface - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a stepladder that imitates unevenness on the ground surface, and more specifically, the leg ends stably imitate the height difference of the installation ground, and the operator uses the imitative leg as a stepladder. The purpose is to develop a stepladder that imitates the unevenness of the ground surface that is configured to be fixed by riding. [Structure] A holding roller that is movable vertically in a diagonal direction via springs is installed on the mounting plates at both ends of the first horizontal rod of the stepladder, and a supporting roller is provided as an axis in the fixed portion that hangs from the center of the second horizontal rod. And a semi-circular copying leg having a rack gear-shaped positioning recess at the center upper part is slidably mounted in the horizontal and vertical directions along the pressing roller and the supporting roller, and at the same time, the pressing roller If the load is not loaded on the stepladder, it is configured so that the copying leg is pushed down diagonally by the action of the spring by the action of the spring so that the copying leg is in the free state. The positioning convex portion provided on the upper portion of the fixing portion of the second horizontal rod is configured to rise against the spring and mesh with the positioning concave portion to fix the copying leg.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a stepladder that imitates unevenness on the ground surface. Specifically, the leg end stably follows the height difference of the installation ground, and the copying leg is fixed by an operator riding on the stepladder. The present invention relates to a stepladder that imitates the unevenness of the ground surface.

[0002]

[Prior art]

 Conventionally, there are various types of stepladders on the market that allow the legs to be hinged at the upper end to open and close, but most of these stepladders are intended for installation on a flat ground, and there are differences in height. When installed on the top, there is a drawback in that all the leg ends are not stable on average, and work on an unstable stepladder is extremely dangerous, so it was often difficult to install it stably. In order to solve such problems, some products with a drawer leg at the leg end and those with a screw adjuster at the leg end are commercially available. However, although the extension leg has a large extension length, the extension leg must be adjusted individually, and the screw adjuster has the advantage that it can be finely adjusted, but the extension length is small, and it is the same as the extension leg. Each leg had to be adjusted, and there was a problem that the expansion and contraction operations were not quick. In order to solve such a problem, the applicant firstly proposed the grounding leg structure of the stepladder, the practical application 5-32221, the grounding adjustable leg structure of the stepladder, the practical application 5-67549, and the grounding height adjusting leg of the stepladder. Although we have applied for a braking structure, registration No. 301 3165, etc., it has a very excellent effect in that the grounding feet follow the unevenness of the ground surface, but the grounding feet are free and the unevenness of the ground surface There was a problem that the worker had to operate the lever to immobilize it, following the above.

[0003]

[Problems to be solved by the device]

 Therefore, this is a stepladder that allows the legs to quickly follow the unevenness on the ground where there is a difference in height, and that the work on the stepladder can be performed safely.In addition, it automatically follows the unevenness without operating the lever. , The development of a stepladder that can fix this is an issue.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention aims to fix a follower leg configured to follow the unevenness of the ground ground by applying a load on the stepladder, that is, by fixing an operator on the stepladder in a state of following the ground surface. It is a stepladder that imitates the unevenness of the ground surface that is configured.Furthermore, a presser roller that is movable diagonally up and down via springs is installed on the mounting plates at both ends of the first horizontal rod of the stepladder. A supporting roller is mounted on the fixed part that hangs from the center of the horizontal rod, and a semi-circular copying leg with a rack gear-shaped positioning recess at the center upper part is placed horizontally and vertically along the pressing roller and the supporting roller. The presser roller is configured so that it can be freely moved by pushing down the copying leg diagonally downward with the use of a spring when the load roller is not loaded with load. Load on the stepladder When the horizontal rod lowers, the presser roller rises against the spring, and the positioning convex portion provided on the upper fixing portion of the second horizontal rod is configured to mesh with the positioning concave portion to fix the copying leg. The stepladder that imitates the irregularities on the surface is not provided.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a stepladder, and an inverted U-shaped mounting portion 2 is provided at the lower end of each leg 1, and the mounting portion 2 is provided with A mounting plate 3 consisting of two plates is fixed. The mounting plate 3 is provided with a groove 5 penetrating diagonally in the vertical direction, and the pressing roller 4 mounted on the sliding plate 6 is movable in the diagonal vertical direction along the groove 5 via the spring 7. It is configured. The spring 7 is attached to a support 8 attached to the sliding plate 6 via a guide bar 9. Reference numeral 10 denotes a fixing pin of the mounting plate 3 composed of two plates, which is also configured to press a copying leg which will be described later. The first horizontal rod 11 is arranged so as to bridge both the mounting plates 3 and 3. Reference numeral 12 is a fixed portion composed of two plate bodies arranged in a suspended state from the center of the second horizontal rod 13, and two support rollers 14 are axially attached below the fixed portion 12. In addition, the positioning convex portion 15 is arranged downward from the upper portion of the fixed portion 12, that is, the lower surface of the second horizontal rod 13. The copying leg 16 has a semicircular shape, and has a rack gear-shaped positioning recess 17 that meshes with the positioning projection 15 at the upper center thereof. The copying leg 16 is inserted between the pressing roller 4 and the supporting roller 14 and is slidable in the vertical direction. The copying leg 16 is inserted between the pressing roller 4 and the support roller 14, but when the load is not applied to the stepladder, the pressing roller 4 is pressed by the spring 7 and pushes the copying leg 16 downward, that is, When the stepping body is raised, the positioning projection 15 provided on the lower surface of the second horizontal rod 13 is separated from the positioning recess 17 provided on the upper surface of the copying leg 16, and the copying leg 16 is free. It is configured to imitate the unevenness of the ground surface. When the copying leg 16 follows the unevenness, the main body of the stepladder is straightened, and the operator puts his foot on the first horizontal rod 11 and the load is applied. If this happens, the stepping main body that has floated will sink, so that the positioning projection 15 and the positioning recess 17 mesh with each other to fix the copying leg 16. At this time, the pressing roller 4 is configured to be pushed up against the spring 7. Further, grounding portions 18 are provided at both ends of the copying leg 16 so as to be bent in an inverted U shape in the front-rear direction and have a bottom portion in an arc shape in the left-right direction. A support plate 19 is provided inside the ground portion 18. Reference numeral 20 is a copy leg fixing portion when the stepladder is not used, and comprises a conical pin 21 and a spring 22 which are slidable in the front-rear direction on the fixing portion 12. When not in use, the knob 23 is pulled to fix the locking portion 24. When locked to the outside of the portion 12, the conical pin 21 is configured to press the copying leg 16 against the spring 22 and prevent the copying leg 16 in the free state from sliding unnecessarily. doing. However, the copy leg fixing portion 20 is not limited to being provided in the portion shown in this embodiment, and the fixing structure is not limited to the embodiment.

[0006]

[Effect of the invention]

 As described above, the present invention is configured so that the copying leg 16 configured to follow the unevenness of the ground contacting ground is fixed in a state of following the ground surface by applying a load to the stepladder, that is, an operator riding on the stepladder. It is a stepladder that follows the unevenness of the ground surface, and further, on the mounting plates 3 at both ends of the first horizontal rod 11 of the stepladder, presser rollers 4 that are movable diagonally up and down via springs 7 are provided. A support roller 14 is pivotally attached to the fixed portion 12 that hangs from the center of the second horizontal rod 13, and a substantially semicircular copying leg 16 provided with a rack gear-shaped positioning recess 17 in the upper center portion is provided with the pressing roller 4. The support rollers 14 are slidably mounted in the horizontal and vertical directions along the support rollers 14, and when the pressing roller 4 has no load on the stepladder, the spring 7 acts to move the copying leg 16 obliquely downward. Push it down and the copy leg 16 When the horizontal rod is lowered due to a load on the stepladder, the pressing roller 4 rises against the spring 7, and the positioning convex portion provided on the upper portion of the fixed portion 12 of the second horizontal rod 13 is arranged. Since 15 is a stepladder that follows the unevenness of the ground surface configured to mesh with the positioning recess 17 and fix the copying leg 16, most conventional stepladders are intended for installation on a flat ground. However, when installing on a ground with height differences, there is a drawback that all the leg ends are not stable on average, and work on an unstable stepladder is very dangerous, so be careful about stable installation. The one with a drawer leg that was developed to solve such a problem has a large expansion and contraction length, but the drawer leg must be adjusted individually, and the one with a screw adjuster does not allow fine adjustment. There is an advantage that you can The length of expansion and contraction is small, and each leg must be adjusted individually as with the above-mentioned drawer leg, and there is a problem in that the expansion and contraction operation is not fast enough. The operation of releasing and fixing 16 requires a lever operation, but after the copying leg 16 follows the unevenness of the ground surface, the operator can place the foot on the first horizontal rod 11 simply by making the stepping body upright. Since the positioning projection 15 and the positioning recess 17 mesh with each other when the load is applied to fix the copying leg 16, the leg portion of the stepladder can very easily follow the unevenness of the ground surface and can be fixed quickly. Further, in a stepladder having this kind of copying leg, the first horizontal rod 11 is provided in a state of bridging the mounting plates 3 and 3, whereby the height of the first horizontal rod is provided at an appropriate portion, and By bridging the lower end of the stepladder, the strength of the stepladder can be improved and other practical effects can be achieved.

[Brief description of the drawings]

FIG. 1 is a partial front view of the device of the present invention.

FIG. 2 is a partially sectional front view of a mounting plate portion of the present invention.

FIG. 3 is a partially sectional side view of a mounting plate portion of the present invention.

FIG. 4 is a partially sectional front view of the fixing part of the present invention.

FIG. 5 is a partially sectional side view of the fixing part of the present invention.

[Explanation of symbols] 1 leg 2 mounting portion 3 mounting plate 4 presser roller 5 groove 6 sliding plate 7 spring 8 support 9 guide bar 10 fixing pin 11 first horizontal rod 12 fixing portion 13 second horizontal rod 14 support roller 15 Positioning convex part 16 Copying leg 17 Positioning concave part 18 Grounding part 19 Support plate 20 Copying leg fixing part 21 Conical pin 22 Spring 23 Knob 24 Locking part

Claims (2)

[Utility model registration claims] 1. A ground surface configured to imitate a copying leg configured to follow the irregularities of the ground contacting ground by imposing a load on the stepladder, that is, by an operator riding on the stepladder in a state of following the ground surface. A stepladder that imitates the unevenness of. 2. A holding roller movable diagonally up and down via springs is provided on the mounting plates at both ends of the first horizontal rod of the stepladder, and a supporting roller is provided at a fixed portion hanging from the center of the second horizontal rod. And a semi-circular copying leg provided with a rack gear-shaped positioning recess at the center upper part, along with the pressing roller and the supporting roller, is slidably inserted in the horizontal and vertical directions, and If there is no load on the stepladder, the presser roller is configured so that the copying leg is pushed down diagonally by the action of the spring so that the copying leg is free, and if the stepladder is loaded and the side lever lowers, the presser foot is depressed. The roller rises against the spring, and the positioning projection provided on the fixed part of the second horizontal rod is configured to mesh with the positioning recess to fix the copying leg.