JP2002089161A - Foldable lifting instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foldable lifting instrument which is excellent in functionality because it has a large top tread and allows its height to be changeable to a desired value, excellent in versatility because it can change its leg- opening angle and its leg setting locations, high in stability when erected, excellent in safety, and stably supports the position of the worker. SOLUTION: The foldable lifting instrument is formed of a pair of right and left front legs, a pair of rear legs, leg pivotal-connecting portions which each rotatably or detachably connect an upper portion of the rear leg to an upper portion of the front leg, the top tread which has its both frontal sides rotatably connected to predetermined portions of the front leg upper portions, respectively, at least one or more treads which each have their frontal sides connected to the front legs, a top tread support portion which is horizontally arranged on the upper portions of the rear legs, and a top tread engaging portion which is arranged on a lower surface of the top tread to engage with the top tread support portion, determines the leg-opening angle between the front legs and the rear legs, and horizontally holds the top tread.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable elevator having foldable legs and steps.

[0002]

2. Description of the Related Art Conventionally, a stepladder used for work at a high place or the like has a leg which can be opened in an inverted V shape, and a tread plate is horizontally attached to the leg. However, the treads that are used for lifting and lowering and working are thin bars,
Since the top tread only has an area of two thin bars,
Since the area of the tread plate facing the sole of the foot is small and the body cannot be stably supported, there has been a problem that the posture is unstable and work efficiency is deteriorated. 2. Description of the Related Art In recent years, a folding stepladder having a large step board and an upper step board has been proposed in order to increase the stability of a posture during lifting and lowering and working.

[0003] As a conventional folding stepladder, there is an actual open flat 7
Japanese Patent Publication No. 32199 (hereinafter referred to as "A") discloses a "foldable stepladder". The foldable stepladder disclosed in Japanese Patent Publication A is provided with a front leg, an upper step plate that is disposed above the front leg and that is connected to the front leg so that both front sides are rotatable, and that a plurality of folding stepladders are disposed between the front leg. A lower tread plate that is connected to the front leg and the front both sides are rotatably connected to each other, a link rod that connects between the rear portions of the upper tread plate and the lower tread plate and is disposed in parallel with the front leg, and an upper tread plate. And a rear leg that is rotatably connected at the upper end to the front portion or the front leg and that is disposed obliquely downward.

[0004] Other foldable stepladders include:
Japanese Patent Application Laid-Open No. 9-21285 (hereinafter referred to as "B")
Discloses a "foldable stepladder". The foldable stepladder disclosed in Japanese Patent Application Publication No. H06-26509 is a combination of a foldable elevator configured with a parallelogram link and a leg provided with a base on an upper stage, and an upper end pedestal and a leg of the foldable elevator. It is connected to the upper base so that it can be bent at the same height, the legs are equipped with extendable legs, and the upper part of the parallelogram link body is a tilt angle with a ratchet for fixing the inclination of the foldable elevator It has a fixing device. The folding stepladder disclosed in the publication No. B configured as described above has an upper end base corresponding to the area of two treads of the elevator, and the inclination of the folding elevator is adjusted by a tilt angle fixing device using a ratchet. Can be changed.

Further, as another folding stepladder, a "folding stepladder" is disclosed in Japanese Patent Application Laid-Open No. 9-88465 (hereinafter referred to as "Chapter 3"). The foldable stepladder disclosed in the publication No. C is a combination of a foldable elevator configured with a parallelogram link and a leg provided with a base on an upper stage, and the upper pedestal and the leg of the foldable elevator are combined. It has a configuration in which the upper end stand is connected so that it can be bent at the same height, and an extendable leg is attached to the leg, and an extendable support member is suspended from the upper end of the link of the foldable elevator to the lower end of the leg. are doing. The foldable stepladder disclosed in the publication No. C configured as described above has an upper end base corresponding to the area of two treads of the elevator, and the gradient of the foldable elevator is changed by an extendable support member. Can be done.

[0006]

However, the above-mentioned conventional folding stepladder has the following problems. (1) The foldable stepladder disclosed in Japanese Patent Publication No. A is unstable when a person goes up to the uppermost stepboard and performs work because the area of the uppermost stepboard is the same as the area of the lower stepboard. There was a problem that. (2) The foldable stepladder disclosed in Nos. B and C has an area of the uppermost tread plate only twice as large as that of the lower tread plate, and when a person works on the uppermost tread plate,
There was a problem that materials and tools could not be placed on the tread. (3) The uppermost tread is not provided with handrails or the like for supporting a body when a person works, and thus has a problem that the balance of the body is easily lost during the work. (4) There is a problem that the mechanism for fixing the elevator by changing the inclination angle is complicated and the manufacturing cost is increased. (5) Since no foldable stepladder can greatly change the reaching height, when the height at which work must be performed is lower than the reaching height of the foldable stepladder, a tread having a large area is provided at the top. Even if it has, it is impossible to work by climbing up to the top tread, in which case the posture becomes unstable, and there is a problem that the effect of the top tread having a large area is not exhibited. Was. (6) Even if there is a problem with the scaffolding and the position where the leg touches the ground is limited, it is not possible to greatly change the landing position of the leg by extending the opening angle of the stepladder. There was a problem that something could not be done. (7) Since there is no handrail that can hold and support the body when ascending and descending, there is a problem that the posture during ascending and descending is unstable. (8) Since there is only an arrival height of about 1 to 1.5 m, there is a problem that it is not suitable for work at a height of 2 to 3 m or more. (9) Since the depth of the step board is small, there is a problem that the posture is unstable when going up and down and working on the step board.

The present invention has been made to solve the above-mentioned conventional problems, and has a wide upper stepping plate which can stand up at the top and work, and a wide stepping plate which can be used at the time of lifting and lowering and at the time of work. It can be changed to the desired height greatly, so it is possible to change the reaching height of the worker and it is excellent in functionality, and the leg opening angle and the arrangement of the legs can be changed according to the installation location, so it is excellent in versatility It is another object of the present invention to provide a foldable elevator that is highly stable and highly stable when standing and standing.

[0008]

In order to solve the above-mentioned conventional problems, a folding elevator according to the present invention comprises a pair of left and right front legs, a pair of rear legs, and each upper portion of the front legs. A leg shaft attachment portion that is rotatably or detachably connected, an upper tread plate that is rotatably connected on both sides of a front portion to a predetermined portion of each upper portion of the front leg, and both end portions are connected to each of the front legs. At least one
More than one tread plate, the upper tread plate support part horizontally laid on the upper part of the rear leg, and the lower tread support part arranged on the lower surface of the upper tread plate locks and determines the opening angle of the front leg and the rear leg And an upper step board retaining portion for holding the upper step board horizontally. With this configuration, it is possible to have a wide upper tread plate that can stand up at the top and work, and a wide tread plate that can be used at the time of lifting and lowering and work, and can greatly change the height of the upper tread plate to a desired height. The height of the worker can be changed and the functionality is excellent, and the leg opening angle and the arrangement of the legs can be changed according to the installation location, so it is versatile and the posture of the worker and the stability at the time of standing It is possible to provide a foldable elevator that is highly safe and excellent in safety.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A folding elevator according to the first aspect of the present invention comprises a pair of left and right front legs, a pair of rear legs, and each upper portion of the rear leg rotatably or A leg shaft attachment portion detachably connected to each other, an upper tread plate rotatably connected to both sides of the front portion to a predetermined portion of each upper portion of the front leg, and at least one or more end portions connected to each of the front legs A tread plate, an upper tread plate support portion horizontally provided above the rear leg, and an upper tread plate support portion disposed on the lower surface of the upper tread plate to lock the upper tread plate support portion, and determine the leg opening angle of the front leg and the rear leg to determine the upper tread plate. And an upper tread engaging portion for horizontally holding the upper plate. With this configuration, the following operation can be obtained. (1) The upper foot plate locking portion disposed on the lower surface of the upper foot plate locks the upper foot plate support portion laterally provided on the rear leg, and the upper foot plate is held horizontally, so that the front leg, the rear leg, and the upper foot plate can be used. Since the angle of opening of the front leg and the rear leg is fixed by the formed triangle, when the person goes up to the upper tread and performs work, the force to fit the upper tread support portion into the upper tread engaging portion always acts, It is possible to prevent an accident that the locking portion of the upper foot plate is disengaged during the work and the foldable elevator is opened and falls down, thereby being excellent in safety. (2) Since the upper stepping plate engaging portion is formed on the lower surface of the upper stepping plate and is engaged with the upper stepping plate support portion provided on the rear leg to hold the upper stepping plate horizontally, the area of the upper stepping plate is increased. It is possible to take up a lot of footholds when people stand on the upper tread and work, so that the posture is stabilized and materials and tool boxes etc can be placed, which is not only excellent in workability But also with excellent safety and functionality. (3) The angle between the front leg and the rear leg can be changed by changing the position of the upper foot plate locking portion that locks the upper foot plate support portion. It is possible to select a grounding place without obstacles and to stably erected it, which is excellent in safety. (4) Further, by changing the opening angle of the front and rear legs,
The height of the upper tread can be changed according to the reaching height desired by the operator, and the functionality is excellent. (5) Since the rear legs are detachably fixed, when the rear legs are removed, a ladder-type folding elevator that can be locked to a horizontal rail or the like of a construction scaffold frame or the like at a construction site is obtained. Excellent.

Here, the upper part of the front leg is curved rearward, or the upper part of the rear leg is curved forward, so that when the front leg and the rear leg are closed for folding, the upper part of the front leg is laid sideways on the rear leg. This is preferable because it is possible to prevent the front leg or the rear leg from contacting the upper step plate or the step plate provided on the upper step plate support portion or the front leg, so that the leg cannot be closed flat.

[0011] In addition, a metal,
When an opening made of synthetic resin, rubber, or the like and through which a stake or the like can be penetrated is formed, the unevenness increases the friction coefficient of the contact surface to prevent the contact portion from slipping. Driving a stake, etc. to strengthen the fixation to the ground on the tread surface prevents the tread portion from slipping or floating,
This is preferable because the folding elevator can be prevented from overturning.

Further, if a hand-rail portion such as a bar or a ring which can be grasped by a person is fixed to a leg shaft attachment portion where the front leg and the rear leg are connected, it is possible for the person to grasp and stabilize the posture during work. It is preferable because it is possible. The handrail part is installed between the leg shaft attachment parts, or
It protrudes from one or both of the leg shaft attachment portions. In addition, the distance in the front leg between the leg shaft attachment portion to which the handrail portion is fixed and the upper foot plate pivot attachment portion where the front leg and the upper foot plate are connected is 100 to 150.
cm is preferred. If this distance is smaller than 100 cm, the person who climbs on the upper tread has a tendency to be unable to grasp the handrail unless the user stretches his hand to the side and bends down.
If it is larger than 0 cm, the body tends to extend upward when grasped, and the posture tends to become unstable. When a handrail is provided on the leg attachment portion, the distance between the upper tread plate pivoting portion and the leg axle attachment portion of the front leg is adjusted from the upper tread plate pivoting portion of the upper tread plate to the rear end of the upper tread plate. When the upper tread is rotated in the front leg direction around the upper tread pivot point, the upper tread is folded until it is parallel to the front legs without being disturbed by the handrails. It is preferable because it can be stored compactly. In addition, one or more upper tread engaging portions can be formed. Further, the length of the front leg and the length of the rear leg can be substantially the same or different. In particular, when the rear leg is formed to have a shorter length than the front leg, the area of the upper tread plate can be increased, and the upper tread plate can be brought closer to the work place, so that the stability is excellent. In addition, if a plurality of upper tread support portions are provided horizontally, different upper tread support portions are locked even when the opening angle of the foldable elevator having front and rear legs of different lengths is changed. It is preferable that the upper tread plate is held horizontally by locking at the portions.

According to a second aspect of the present invention, there is provided the foldable elevator according to the first aspect, wherein the front side of the step board is pivotally connected to each of the front legs so as to be rotatable on both front sides of the step board. And a pair of left and right link rods rotatably connected to the lower surface of the upper tread plate and the rear portion of the tread plate while holding the upper tread plate and the tread plate in parallel, and provided in parallel with the front legs. It has a configuration. With this configuration, the following operation is obtained in addition to the operation obtained in the first aspect. (1) Since the tread plate is disposed between the front leg and the link rod and has a depth, the foot can be firmly put on the tread plate, and the posture is stabilized as if going up and down stairs, and the safety is excellent. (2) Since the upper step board, the step board, the front legs, and the link rod form a parallelogram link body, when the upper step board is horizontal, the link board can also make the step board horizontal at the same time, and when the upper step board is closed, the step board is closed. It can be folded at the same time and has excellent functionality.

[0014] Here, if the distance between the adjacent step plate front pivot portions of the front legs is longer than the distance from the step plate front pivot portion to the rear end of the step plate, the step plate is folded to fold the foldable elevator. When the footboard is rotated in the direction of the front leg around the front part pivot joint, the footboard is folded until it is parallel to the front leg without being disturbed by the adjacent footplate, and is stored compactly, which is preferable.

According to a third aspect of the present invention, there is provided the foldable elevator according to the first or second aspect, wherein a protruding support portion protruding from both sides of a rear portion of the upper tread plate; And a rear leg locking portion formed on the back side of the front leg to lock the projecting support portion. According to this configuration, claim 1 or claim 2
In addition to the effects obtained in the above, even when the opening angle of the front leg and the rear leg is changed, the upper stepping plate and the stepping plate can be held horizontally, and an effect of excellent workability is obtained.

The shape of the rear leg locking portion is not limited as long as it is formed on the rear side of the rear leg and can support the projecting support portion. A plurality of plate-like members, rod-like members, or the like, which are formed in a shape or the like and are engaged with the projecting support portions, are used.

According to a fourth aspect of the present invention, there is provided the foldable elevator according to any one of the first to third aspects, wherein a pair of rear legs is replaced with a leg shaft attachment portion. It has a configuration that includes a shaft portion that is coupled above the upper tread plate, and a leg portion that extends downward from the center of the shaft portion and penetrates a long hole of the upper tread plate formed in the upper tread plate. With this configuration, the following operation is obtained in addition to the operation obtained in any one of the first to third aspects. (1) Since the legs are connected above the upper step board and penetrate through the long hole of the upper step board provided on the upper step board, at least three grounding portions are required when the foldable elevator is erected. Therefore, even when it is difficult to stably stand the ground surface such as a garden or an orchard with many undulations, all the ground parts can be grounded, and the stability is excellent. (2) Since the shaft portion that connects the shaft pivot portion is provided above the upper tread plate, the shaft portion can be gripped when a person works on the upper tread plate. The posture can be kept stable and the safety is excellent.

Here, the long hole of the upper step board provided in the upper step board may be closed or opened in the upper step board, but when closed, the strength of the upper step board can be secured. preferable. Also, when opened, each of the plurality of upper tread support members formed on the upper tread can be locked by the upper tread lock portion, and the folding type lift having the front legs and the rear legs having different lengths is provided. Even when the leg opening angle is changed, it is preferable that the upper footboard can be held horizontally by locking different upper footboard support portions with the upper footboard locking portions. Also,
It is preferable to provide a detachable lid-like member that covers the long hole portion of the upper tread plate in order to prevent a person from being caught in the long hole portion of the tread plate and to improve safety.

According to a fifth aspect of the present invention, there is provided a foldable elevator according to any one of the first to fourth aspects, comprising: a. A telescopic adjuster disposed on the rear leg or the leg for adjusting the leg length; b. A pair of left and right holding portions disposed on the rear side of the rear leg above the upper foot plate support portion, and the upper foot plate is detachably mounted on the holding portion and is locked by the upper foot plate locking portion. It has a configuration provided with any one or more of the rear leg erection support portions that hold horizontally. With this configuration, in addition to the function obtained in any one of claims 1 to 4, the rear leg is provided with a telescopic adjustment portion that can greatly expand and contract the length of the rear leg, so that the reaching height of the upper tread plate is a desired height. Can be greatly changed, and the upper footboard can be held horizontally, so that the worker can work in a stable posture by climbing to the uppermost upper footboard adjusted to a desired height. And an effect of being excellent in safety and functionality can be obtained.

Here, the expansion / contraction adjusting section is (a) an outer cylinder having at least one or at least two holes, and an outer cylinder having at least two or more or at least one hole inserted into the outer cylinder. (B) an outer cylinder screwed on the inner peripheral surface, and an inner cylinder screwed on the outer peripheral surface. (C) an outer cylinder or an inner cylinder having a locking member formed in irregularities such as a saw blade, and a locking member such as a saw blade or a projection locked by the locking member. (Button latch) or the like having an inner cylinder or an outer cylinder having

The shape of the holding portion is limited as long as the holding portion can support the rear leg erection support portion between the rear legs on the rear side above the upper step support portion of the pair of left and right rear legs. Instead, a holding portion having a pair of left and right protrusions, which is formed into a substantially J-shape or a substantially U-shape, and to which the rear leg erection support portion is locked, both ends of the rear leg erection support portion are inserted. A pair of left and right plate-shaped holding portions formed with a plurality of holes and grooves, and opposing sides formed with a substantially comb-shaped groove portion in which both end portions of the rear leg supporting portion slide freely and are locked by predetermined portions. A box-shaped holding portion or the like having a surface to be used is used. Among them, a box-shaped holding portion formed with a substantially comb-shaped groove portion that facilitates movement and locking of the rear leg erection supporting portion is preferably used.

According to a sixth aspect of the present invention, there is provided the foldable elevator according to the fourth or fifth aspect, wherein an upper stepping plate projecting support portion projecting from both sides of the leg portion, or An upper tread hole formed at the center of the upper tread from the rear to the front and having a leg penetrated, an upper tread locking portion formed at both sides of the upper tread plate, and an upper tread long hole And an elongated hole supporting portion disposed at the rear end portion, and a leg portion protruding from the rear side above the upper step plate supporting portion and locking the elongated hole supporting portion to hold the upper step board horizontally. And a rear leg locking portion. With this configuration, the following operation is obtained in addition to the operation obtained in the fourth or fifth aspect. (1) Since the upper tread plate locking portions are formed on both sides of the upper tread plate long hole portion, the upper tread plate projecting support portions projecting from both sides of the leg portions are locked in a well-balanced manner, and the stability is excellent. (2) Since the rear leg locking portion locks the elongated hole support portion and holds the upper tread plate horizontally, the worker can work in a stable posture on the upper tread plate, and is excellent in safety.

According to a seventh aspect of the present invention, there is provided the foldable elevator according to any one of the second to sixth aspects, wherein the link rod has a grounding portion at a lower end portion. are doing. With this configuration, in addition to the effect obtained in any one of claims 2 to 6, when the folding elevator is erected, the link rod having the ground contact portion in addition to the front leg and the rear leg can be folded. And, to support the load of the person, the stability of the foldable elevator is increased, the load is dispersed and the load-bearing capacity of one leg can be reduced, and the weight of the members constituting the leg can be reduced, The effect of being excellent in stability and lightness is obtained.

[0024] Here, when an uneven portion made of metal, synthetic resin, rubber or the like and / or an opening through which a pile or the like can be penetrated are formed on the ground surface of the ground portion, the uneven portion is formed to have a friction coefficient of the ground surface. To prevent the grounding part from slipping, and the opening is driven into the grounding surface with a stake, etc. to strengthen the fixation to the ground, preventing the grounding part from slipping or floating, and a folding elevator Is preferable because it can be prevented from falling down.

Further, if a link rod extension mechanism capable of raising and lowering the grounding portion is provided at a predetermined portion near the lower end portion of the link rod, the grounding portion can be connected to the ground or floor even if the ground or floor surface is not flat. This is preferable because it can be brought into close contact with the surface, the step board and the upper step board can be kept horizontal, and the folding elevator can be stably erected. The telescopic mechanism includes (a) an outer cylinder screwed on the inner peripheral surface, an inner cylinder screwed on the outer peripheral surface,
(B) An outer cylinder or an inner cylinder having a locking member formed in irregularities such as a saw blade, and an inner cylinder having a saw blade or a protrusion locking by the locking member. One having a cylinder or an outer cylinder (button latch) or the like is used.

An eighth aspect of the present invention is the foldable elevator according to any one of the first to seventh aspects, wherein the foldable elevator is provided at a rear portion of the upper step board and an upper portion of the front leg or the rear leg. ,
An engaging member for engaging a tension member such as a wire or a chain,
And a stretching member such as a wire or a chain stretched between the engaging members. With this configuration, the following operation is obtained in addition to the operation obtained in any one of the first to seventh aspects. (1) Since a tension member such as a wire or a chain surrounds the upper tread plate, it is possible to prevent a person from stepping off his / her foot or to protrude to the left and right and to fall down, thereby being excellent in safety. (2) Even when the upper tread support portion is disengaged from the upper tread retaining portion that holds the upper tread horizontally, and the upper tread cannot be held horizontally, a tension member such as a wire or a chain stretches the upper tread. Therefore, the level of the upper tread can be kept horizontal, and the safety is excellent.

According to a ninth aspect of the present invention, there is provided a foldable elevator according to any one of the first to eighth aspects, wherein the foldable elevator is formed on a side portion or a rear portion of a front leg and / or a rear leg. And an auxiliary leg having one end portion detachably fixed by a fixing member and the other end portion formed to be extendable and contractible. According to this configuration, claims 1 to 8
In addition to the function obtained by any one of the above, the following function is obtained. (1) It is possible to prevent the foldable elevator that has been erected from falling over in the lateral direction, and it is excellent in safety. (2) The location where the auxiliary leg is fixed and the length of the auxiliary leg can be changed according to the undulation of the installation location, obstacles, and the like, and the versatility is excellent.

Here, the mechanism for making the auxiliary leg extendable and contractable includes (a) an outer cylinder screwed on the inner peripheral surface and an inner cylinder screwed on the outer peripheral surface. An outer cylinder or an inner cylinder having a locking member formed in an uneven shape such as a blade, and an inner cylinder or an outer cylinder having a locking tool such as a saw blade or a projection locked by the locking member. (A button latch) or the like.

According to a tenth aspect of the present invention, there is provided the foldable elevator according to any one of the first to ninth aspects, wherein the front leg and / or the rear leg or the leg portion is one of the following. 1 is formed. (A) A hollow tube having a J-shaped cross section and a thick front portion. (B) A cross-shaped or spoke-shaped reinforcing member is formed or arranged in a hollow portion having a hollow circular or hollow square shape. This hollow tube has the following effects in addition to the effects obtained in any one of the first to ninth aspects. (1) The front leg, which has a J-shaped cross section and a thick front portion, can be easily gripped, so that even if the front leg is gripped by a hand with oil, the finger is hardly caught and slips, so that the safety is excellent. (2) The hollow tube on which the reinforcing member is formed or disposed is lightweight, easy to carry, and has high strength, so that it can be used for carrying heavy objects, and is lightweight and safe. Excellent.

Here, the hollow tube is made of a lightweight and high-strength metal material such as aluminum by pulling out the reinforcing member and the tube integrally, or by inserting the reinforcing member into the inside of the tube or welding. It is manufactured by fixing.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a perspective view of a foldable elevator according to Embodiment 1, FIG. 2 is a side view of the foldable elevator according to Embodiment 1, and FIG. FIG. 4 is a side view of the upper step board, FIG. 5 is a perspective view of a pivot portion of the auxiliary leg, FIG. 6 is a side view showing a folding state of the foldable elevator, and FIG. It is a side view which shows the state in which the height of the foldable elevator was made substantially half.

In FIG. 1, reference numeral 1 denotes a folding elevator formed in the form of a stepladder according to the first embodiment, 2 denotes a pair of left and right front legs, and 3 denotes an outer side of the front legs 2 and the upper portion faces forward. A pair of right and left rear legs 4 formed in a curved shape are leg shaft attachment portions connecting the upper portions of the front legs 2 and the upper portions of the rear legs 3 rotatably.
Reference numeral 6 denotes an upper tread plate which is disposed horizontally and allows a person to stand on the upper surface to perform work or the like, 6 denotes an upper tread plate pivoting portion which rotatably connects the front sides of the upper tread plate 5 to the front leg 2, 7. Reference numeral 8 denotes a tread plate which serves as a foothold for raising and lowering and work, 8 denotes a tread plate front pivoting portion which rotatably connects the front sides of the tread plate 7 to the front leg 2, and 9 denotes a pivot at the lower end of the front leg 2. The front leg grounding portion, which is movably pivotally mounted and has a trapezoidal side surface having unevenness on the grounding surface against sliding in the front-rear direction, is connected to the lower surface of the upper stepping plate 5 and the rear end of the stepping plate 7. The upper stepping plate 5 and the stepping plate 7 are arranged in parallel, and a pair of right and left link rods 11 arranged in parallel with the front leg 2 are pivotally attached to the lower end of the link rod 10 so as to be rotatable. A link rod grounding portion 17 having a trapezoidal side surface having irregularities against sliding in the front-rear direction. A fastening member that is.

Reference numeral 19 denotes a rear leg outer cylinder constituting the upper part of the rear leg 3, 20 denotes a rear leg inner cylinder constituting the lower part of the rear leg 3 slidably fitted in the rear leg outer cylinder 19, 21a 'and 21a are holes formed in the rear leg outer cylinder 19 and the rear leg inner cylinder 20, respectively 21b, 21c and 21d are holes formed in the rear leg inner cylinder 20 and 22 is a rear hole. The rear leg outer cylinder 1 penetrates through the holes 21a 'and 21a formed in the leg outer cylinder 19 and the rear leg inner cylinder 20.
9 is a lock pin for fixing the rear leg inner cylinder 20 so as not to slide inside. Outer cylinder 19 for rear legs, inner cylinder 20 for rear legs,
The holes 21a ', 21a, 21b, 21c, 21d and the lock pin 22 constitute a telescopic adjustment portion of the rear leg 3, and the combination of the holes 21a', 21a, 21b, 21c, 21d forms the following three stages (a) to (c). The length can be varied. (A) The lock pin 22 is inserted into the hole 21a 'of the rear leg outer cylinder 19.
And the hole 21b of the rear leg inner cylinder 19, the length of the rear leg 3 is reduced by the distance between the hole 21a and the hole 21b formed in the rear leg inner cylinder 20, The length from the upper end of the rear leg outer cylinder 19 to the hole 21a 'drilled in the rear leg outer cylinder 19 and the hole 21b drilled in the rear leg inner cylinder 20 from the rear leg inner cylinder 20 (The length of the rear leg 3 at this time is referred to as A). (B) The lock pin 22 is inserted into the hole 21a 'of the rear leg outer cylinder 19.
And through the hole 21 c of the rear leg inner cylinder 20, the length of the rear leg 3 becomes the hole 2 drilled from A into the rear leg inner cylinder 20.
The length is calculated by subtracting the length from 1b to the hole 21c (hereinafter, the length of the rear leg 3 at this time is referred to as B). (C) Insert the lock pin 22 into the hole 21 a ′ of the rear leg outer cylinder 19.
And through the hole 21 d of the rear leg inner cylinder 20, the length of the rear leg 3 becomes the hole 2 formed in the rear leg inner cylinder 20 from B.
The length is obtained by subtracting the interval between the hole 1c and the hole 21d (hereinafter, the length of the rear leg 3 at this time is referred to as C). Arrows a and b indicate the directions of rotation of the open / closed legs.

2, 3 and 4, reference numeral 10a denotes an upper portion of the link rod 10, and an outer cylinder for a link rod in which a screw or a button latch is formed on an inner peripheral surface of the lower portion, and 10b denotes an outer peripheral portion of the upper portion. A link rod 10 having a threaded surface and an insertion hole for a button latch formed on its surface and inserted into a lower portion of a link rod outer cylinder 10a.
Of the link rod constituting the lower part of the link rod, 12 is the link rod 10
Is a link rod pivoting portion whose upper end is rotatably connected to the lower surface of the upper tread plate 5, 13 is a tread plate rear pivoting portion where the link rod 10 is pivotally pivotally connected to the rear portion of the tread plate 7, and 14 is An upper stepping plate locking portion 15 comprising a plurality of recesses for locking and fixing an opening angle of the front leg 2 and the rear leg 3 provided on the lower surface of the upper stepping plate 5;
Reference numeral denotes an upper tread support portion which is provided horizontally on the upper portion of the rear leg 3 and is fitted and locked in one of the recesses of the upper tread locking portion 14. Reference numeral 16 denotes an engaging member protruding from a rear portion of the upper tread plate 5,
Reference numeral 18 denotes a stretching member formed of a wire, a chain, or the like stretched between the engaging members 16 and 17.

In FIGS. 1 and 7, reference numeral 23 denotes the upper step board 5.
Projecting support portions 24a, 24b, and 24c are provided on both sides of the rear portion in parallel with the upper tread support portion 15.
When the length of the rear leg 3 is set to the above-mentioned A, B or C by locking the protruding support portion 23 and projecting from the rear side of the rear leg 3 above the upper leg 5, Is a rear leg locking portion for holding the horizontal. When the length of the rear leg 3 is A, the rear leg locking portion 24a is protruded at a position associated with the upper stepping plate 5 and the stepping plate 7 so as to be held horizontally. When the length of the leg 3 is B, it is protrudingly provided at an associated position so as to hold the upper tread plate 5 and the tread plate 7 horizontally. Sometimes, the upper and lower steps 5 and 7 are protrudingly provided at associated positions so as to keep the steps horizontally. Reference numeral 25 denotes a rear leg contact portion which is rotatably connected to the lower end of the rear leg 3 and has a concave and convex surface on the contact surface which resists sliding in the front-rear direction, and has a trapezoidal side surface. Reference numeral 26 denotes a reinforcing bar which is laid between the rear legs 3 below the rear legs 3 and keeps a space between the pair of rear legs 3.

1 and 5, reference numeral 27 denotes a pair of left and right auxiliary legs provided on the side of the rear leg 3, and reference numeral 28 denotes a fixing portion which is bent in a substantially rectangular shape and fixed to one end of the auxiliary leg 27. , 29 are elongated holes formed in the center of the fixing portion 28, and 29a is the fixing portion 2
8, an upper slot, which is a slot 29 above the bent portion of FIG.
9b is a lower slot which is an elongated hole 29 below the bent portion of the fixing portion 28, 30 is a bolt protruding from a predetermined portion on both side surfaces of the front leg 2 or the rear leg 3 and penetrating the elongated hole 29. A fixing member 31 composed of a nut or the like to be screwed in, an auxiliary leg outer cylinder having an upper portion of the auxiliary leg 27 and a screw or a button latch formed on the lower inner peripheral surface, and a screw 32 on the upper outer peripheral surface An auxiliary leg inner cylinder which is inserted into a lower portion of the auxiliary leg outer cylinder 31 and has a lower portion formed therein for adjusting the length of the auxiliary leg 27, and 33 is an auxiliary leg An auxiliary leg grounding portion which is rotatably fixed to the lower end of the inner cylinder 32 and has a circular grounding surface.

Here, in the first embodiment, the leg axle attachment portion 4 has openings formed in the upper portions of the front leg 2 and the rear leg 3, and has an opening, and the front leg 2 and the rear leg 3 have the openings. A spacer, a bolt penetrating through the opening of each of the front leg 2, the rear leg 3, and the spacer; a front leg 2, a rear leg 3 screwed to the bolt;
And a nut for holding the spacer. With this configuration, even if the spacer is worn due to friction when opening and closing the front leg 2 and the rear leg 3 and a gap is generated between the front leg 2 and the rear leg 3, the gap can be eliminated by tightening the nut, and the wear can be reduced. It is possible to prevent the front leg 2 and the rear leg 3 of the foldable elevator, which is erected from standing, from rattling due to the gap and causing the body to become unstable during lifting and lowering and work. Also, since the spacer is removable,
When the wear is remarkable, it is possible to form a foldable elevator that is stably provided by replacing the spacer.
Further, the distance from the upper footboard pivoting portion 6 of the front leg 2 to the upper end of the front leg 2 and the rear leg 3 is shorter than the distance from the upper footboard pivoting portion 6 of the upper footboard 5 to the projecting support portion 23, and , Front pivot joint 8 of the adjacent tread on the front leg 2
Is formed so as to be larger than the distance from the front plate pivot portion 8 to the rear plate pivot portion 13 of the step board 7. Thus, when the foldable elevator 1 is folded, the upper stepping plate 5 and the stepping plate 7 can be rotated until they are parallel to the front legs 2 and can be folded flat. do not do.

With respect to the foldable elevator according to the first embodiment configured as described above, a. During storage (when folded) b. When the legs are open (when standing up) c. The operation at the time of changing the height (at the time of standing use) will be described below.

A. At the time of storage (at the time of folding) The rear end of the upper step board 5 of the foldable elevator 1 erected near the engaging member 16 is lifted upward, and the upper step is locked by the concave portion of the upper step board locking portion 14. After the step board support part 15 is removed, when the upper step board 5 is turned around the upper step board pivot part 6 in the direction a, the link rod pivot part 12 is attached to the lower surface of the upper step board 5.
The link rod 10 connected by the closing is closed while keeping the front leg 2 parallel. At the same time, the tread plate 7 connected to the link rod 10 by the tread plate rear connection portion 13 is rotated in the direction a around the tread plate connection portion 8 connected to the front leg 2, and extends parallel to the upper tread plate 5. The footboard 7 is folded inside the front leg 2 while keeping it. When the rear leg 3 is further rotated in the direction b around the leg shaft attaching portion 4, the rear leg 3 is folded to the outside of the front leg 2.

B. When the leg is opened (when standing up) When the rear end of the upper stepping plate 5 near the engaging member 16 is rotated in the direction b around the upper stepping plate connecting portion 6, the link rod connecting portion is attached to the lower surface of the upper stepping plate 5. Since the link rod 10 connected by the link 12 is opened while maintaining the parallelism with the front leg 2, the tread plate 7 connected to the link rod 10 by the tread plate rear pivot portion 13 is changed to the tread plate front pivot portion 8 connected to the front leg 2. And is opened in the direction b with the upper tread plate 5 kept parallel. Next, the rear leg 3 is rotated in the direction a around the leg shaft attaching portion 4, and the upper leg disposed on the lower surface of the upper tread plate 5 so that the opening angle of the front leg 2 and the rear leg 3 becomes a desired angle. When the upper tread support portion 15 provided on the rear leg 3 is locked in one of the recesses of the tread locking portion 14, the front leg 2 and the rear leg 3 are opened at a desired angle, and the upper tread 5 and the tread plate are opened. A folding elevator 1 in which 7 is kept horizontal is formed. According to the flatness of the contact surface, the link rod contact portion 1
The length of the link rod 10 is screwed into the link rod outer cylinder 10a or the amount of screwing of the link rod inner cylinder 10b fixed by a button latch or the like, or the insertion position of the button latch so that 1 is completely grounded. Adjust by the following. Further, the auxiliary legs 27
The elongated hole 29 of the fixing portion 28 fixed to one end of the rear leg 3
Fixing members 30 such as bolts provided at predetermined portions on both side surfaces of the
And then fixed with a nut or the like,
When the screwing amount of the auxiliary leg inner cylinder 32 inserted into the auxiliary leg outer cylinder 31 or the insertion position of the button latch, etc. is adjusted so that the grounding is completely grounded, the folding type grounded at the eight grounding portions. The elevator 1 is erected. Since the fixing portion 28 fixed to one end of the auxiliary leg 27 is formed to be bent in a substantially elliptical shape and has the elongated hole portion 29, the fixing member 30
By loosening the fixing member 28, the fixing member 28 can be rotated at an arbitrary angle around the fixing member 30, and the fixing member 30 is
If tightened at 9a, the auxiliary leg 27 is fixed diagonally downward at an arbitrary rotation angle and at an angle corresponding to the bending angle of the fixing portion 28. Further, if the fixing member 30 is loosened and the fixing portion 28 is moved upward, and the fixing member 30 is fastened with the lower slot 29b, the fixing portion 28 can be fixed so that the auxiliary leg 27 is attached to the rear leg 3. Since the auxiliary leg 27 can be removed by removing the fixing member 30 from the elongated hole portion 29, the auxiliary leg 27 which is opened to the side is folded and removed, and the folding elevator 1 and the auxiliary leg 27 are removed. It is stored compactly.

C. When the height is changed (when standing up) The lock pin 22 penetrated through the holes 21a 'and 21a formed in the rear leg 3 is removed, and the inner cylinder 20 for the rear leg is replaced with the outer cylinder 1 for the rear leg.
9, and a hole 21 a formed in the rear leg outer cylinder 19.
′ And the position of the hole 21 b or 21 c or 21 d formed in the rear leg inner cylinder 20, and then the lock pin 22 is inserted into the hole 21 a ′ formed in the rear leg outer cylinder 19. When penetrated, a rear leg 3 of length A, B or C is formed. Thereafter, when the length of the rear leg 3 is A, the projecting support portion 23 is locked by a rear leg locking portion 24a, and when the length of the rear leg 3 is B, it is locked by a rear leg locking portion 24b. When the length of the rear leg 3 is C, the rear leg 3 is locked by the rear leg locking portion 24c.
Are held horizontally, and the reaching height of the upper step board 5 is reduced to form the foldable elevator 1. Note that the footboard 7
Is pivotally connected to the link rod 10 at a rear pivoting portion 13 of the tread plate while keeping it parallel to the upper tread plate 5, and the link rod 10 is pivotally pivotally rotatable between the upper tread plate 5 and the link rod pivoting portion 12. Since it is worn, when the upper step board 5 is held horizontally, the step board 7 is also held horizontally.

Here, in the first embodiment, the leg shaft attaching portion 4
Although the description has been given of a case where a handrail that can be grasped by a person is not fixed to the inside of the handrail, the handrail such as a bar or an annular member is attached to the
In some cases, it may be erected between them or protruded from one or both of the leg attachment portions 4. Thereby, the worker who has climbed to the upper step board 5 can grasp the handrail portion and stabilize the posture during the work. In some cases, openings may be provided in the grounding surfaces of the front leg grounding portion 9, the link rod grounding portion 11, the rear leg grounding portion 25, and the auxiliary leg grounding portion 33 so that the pile can be penetrated. Thus, when the pile is penetrated through the opening, the fixation between the ground contact surface and the ground is strengthened, and it is possible to prevent the contact surface from slipping or floating and the folding elevator 1 from tipping over.

In the first embodiment, the length of the rear leg 3 is A, B, C (the rear leg locking portions 24a, 24b, 24c).
Although the case where the number of steps is variable has been described, the present invention is not limited to this, and the number of steps may be two or four or more.

As described above, the foldable elevator according to the first embodiment has the following functions. (1) The upper foot plate locking portion disposed on the lower surface of the upper foot plate locks the upper foot plate support portion laterally provided on the rear leg, and the upper foot plate is held horizontally, so that the front leg, the rear leg, and the upper foot plate can be used. Since the angle of opening of the front leg and the rear leg is fixed by the formed triangle, when the person goes up to the upper tread and performs work, the force to fit the upper tread support portion into the upper tread engaging portion always acts, It is possible to prevent an accident in which the upper foot plate locking portion is disengaged during operation and the foldable elevator is opened and falls down, thereby being excellent in safety. (2) The upper footboard is held horizontally by engaging the upper footboard locking portion formed on the lower surface of the upper footboard and the upper footboard support portion provided on the rear leg, thereby increasing the area of the upper footboard. It is possible to take a lot of scaffolding when people stand on the upper tread and work, so that the posture is stabilized and the materials and tool boxes can be placed,
Not only excellent workability but also safety and functionality. (3) The angle between the front leg and the rear leg can be changed by changing the position of the upper foot plate locking portion that locks the upper foot plate support portion. It is possible to select a grounding place without obstacles and to stably erected it, which is excellent in safety. (4) Further, the height of the upper tread can be changed according to the reaching height desired by the operator, and the functionality is excellent. (5) Since the tread plate is disposed between the front leg and the link rod and has a depth, the foot can be firmly put on the tread plate, and the posture at the time of elevating and lowering and working is stabilized, and the safety is excellent. (6) Since the upper step board, the step board, the front legs, and the link rod form a parallelogram link body, when the upper step board is horizontal, the link board can also make the step board horizontal at the same time, and when the upper step board is closed, the step board is closed. It can be folded at the same time and has excellent functionality. (7) Since the rear leg is provided with a telescopic adjustment unit, the reaching height of the upper tread can be greatly changed to a desired height,
And since it has a rear leg locking part and can hold the upper step board horizontally, the worker can work on the upper step board adjusted to a desired height and work in a stable posture, Excellent safety and functionality. (8) Since the link rod having the ground contact portion in addition to the front leg and the rear leg supports the load of the foldable elevator and the person, the stability of the foldable elevator is increased, and the load is dispersed to withstand the resistance of each leg. The load can be reduced, the weight of the members constituting the legs can be reduced, and stability and lightness are excellent. (9) Since the length of the link rod can be adjusted according to the flatness of the grounding surface so that the link rod grounding portion is completely grounded, the stability is excellent. (10) Since a tension member such as a wire or a chain surrounds the upper tread plate, it is possible to prevent a person from stepping off the foot or to protrude to the left and right and to fall down, and to provide a tension member such as a wire or a chain. However, since the upper step board is stretched, even when the support portion for holding the upper step board horizontally is disengaged and the upper step board cannot be held horizontally, the upper step board can be kept horizontal and excellent in safety. (11) Since the auxiliary leg prevents the folding elevator from falling down in the lateral direction, the safety is excellent. (12) The location where the auxiliary leg is fixed and the length of the auxiliary leg can be changed according to the ups and downs of the installation location, obstacles, etc., and the versatility is excellent.

(Embodiment 2) FIG. 8 is a side view of a main part of an upper part of a foldable elevator according to Embodiment 2 using the foldable elevator according to Embodiment 1, and FIG. It is a principal part perspective view of the rear leg upper part of the folding type elevator in form 2. Note that the same components as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the figure, 1a is a foldable elevator according to the second embodiment,
3a is a holding portion 34 instead of the rear leg locking portions 24a, 24b, 24c formed on the rear leg 3 described in the first embodiment.
The rear leg 5a of the foldable elevator 1a on which the below-described (formed later) is formed is a foldable type in which the projecting support portion 23 of the upper foot plate 5 of the foldable elevator 1 of the first embodiment is not formed. The upper stepping plate 34 of the elevator 1a is a box-shaped holding portion formed on the rear side above the upper stepping plate supporting portion 15 of the rear leg 3a, and a pair of left and right is formed of a pair of holding portions 34a, 34b, 34c, 34d. Grooves formed on the opposing surfaces and formed in a substantially comb shape, 35 are substantially comb-shaped grooves 34a, 34b, 3
4 c and 34 d are rod-shaped rear leg bridge supporting portions which are detachably attached to both ends and are slidably attached to each other, and are fitted and locked in recesses of the upper step board locking portion 14. The groove 34a
When the length of the rear leg 3a is A, the upper tread plate 5a in which the rear leg erection support portion 35 slidably locked in the groove portion 34a is locked by the upper tread plate locking portion 14 is held horizontally. Is formed at the position associated with. When the length of the rear leg is B, the groove 34c is provided with the upper foot plate 5 that locks the rear leg erection support portion 35 locked in the groove 34c with the upper foot plate locking portion 14.
a is formed at an associated position so as to be held horizontally. Further, when the length of the rear leg is C, the groove 34d is configured such that the upper tread plate 5a in which the rear leg erection support portion 35 locked in the groove 34d is locked by the upper tread plate locking portion 14 is horizontally held. Formed at the associated location.

With respect to the foldable elevator 1a according to the second embodiment having the above configuration, a. During storage (when folded) b. The operation at the time of opening the legs (at the time of standing use) is the same as that described in the first embodiment, and the description is omitted.

Next, the folding elevator according to the second embodiment will be described with reference to c. The operation at the time of changing the height (at the time of standing use) will be described below. c. When the height is changed (when standing up) The lock pin 22 penetrated through the holes 21a 'and 21a formed in the rear leg 3a is removed, and the inner cylinder 20 for the rear leg is slid into the outer cylinder 19 for the rear leg. The hole 21 formed in the rear leg outer cylinder 19
After matching the position of a 'with the position of the hole 21b or 21c or 21d formed in the inner cylinder 20 for the rear leg, the lock pin 22 is inserted into the hole 21a' formed in the outer cylinder 19 for the rear leg. When penetrated, a rear leg 3a having a length of A, B or C is formed. Next, the grooves 34a, 34b,
The rear leg erection support portion 35 mounted in 34c, 34d is
When the length of the rear leg 3a is A, it slides and locks in the groove 34a, and when the length of the rear leg 3a is B, it slides and locks in the groove 34c, and the length of the rear leg 3a is C. At this time, the upper slide plate is slid into the groove 34d and locked.
When the rear leg erection support portion 35 locked to a or 34c or 34d is locked, the upper tread plate 5a and the tread plate 7 are held horizontally, and the foldable elevator 1a in which the reaching height of the upper tread plate 5a is reduced is provided. It is formed.

Here, in the foldable elevator 1a according to the second embodiment, the holding portion 34 is provided with the rear leg supporting portion 35.
Has been described in the case of a box shape in which both ends are freely slid and substantially comb-shaped grooves are formed which are locked by the grooves 34a, 34c, 34d. The shape is not limited as long as it can support the rear leg erection supporting portion 35 between the rear legs 3a on the rear side above the portion 14, and is formed into a substantially J shape, a substantially U shape, or the like. A holding portion having a plurality of left and right paired projections into which the rear leg bridge support portion 35 is fitted, a pair of left and right holes formed with a plurality of holes and grooves into which both ends of the rear leg bridge support portion 35 are inserted. It may be a plate-like holding part. When changing the opening angle of the front leg 2 and the rear leg 3a when the lengths of the front leg 2 and the rear leg 3a are different, one of the plurality of upper foot plate support portions 15 may be connected to the upper foot plate locking portion 14. To hold the upper step board 5a horizontally.

As described above, the foldable elevator according to the second embodiment is configured, and thus has the following operation in addition to the operation of the first embodiment. (1) A substantially comb-shaped groove is formed on one surface of the box-shaped holding portion, and both ends of the slidable rear leg erection support portion are mounted in the groove portion, so that the rear leg erection support portion falls off. There is no danger and the safety is excellent, and the operability is excellent because the rear leg erection support portion can be easily moved. (2) Since the holding portion for holding the rear leg erection supporting portion has a simple configuration, it can be manufactured at low cost and is excellent in cost performance. (3) Since a plurality of upper tread support portions are provided, even when the opening angle of the front leg and the rear leg is changed when the length of the front leg and the rear leg is different, any one of the upper tread support portions is used as the upper tread plate. It can be locked by the locking part and the upper tread can be held horizontally,
Excellent stability.

(Embodiment 3) FIG. 10 shows Embodiment 3 of the present invention.
It is a perspective view of the folding type elevator in. Note that the same components as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the figure, 1b is a foldable elevator in the third embodiment, 2a is a pair of left and right front legs formed of a hollow tube having a thicker cross section at the front side, and 36 is a pair of left and right legs. A shaft portion erected between the shaft mounting portions 4;
Reference numeral 3b denotes a leg which is provided downward from the center of the shaft portion 36 and has a rear leg contact portion 25 at the lower end, and 5b has an outer edge inside a triangle formed by the front leg contact portion 9 and the rear leg contact portion 25. The upper foot plate is widened from the rear portion toward the front portion, and both sides of the front end portion are connected to the front leg 2a by the upper foot plate pivoting portion 6.
Reference numeral 15a denotes an upper stepping plate projecting support portion which is provided on both sides of a predetermined portion above the leg portion 3b and is fitted and locked in one of the concave portions of the upper stepping plate locking portion 14, and 19a is an upper portion of the leg portion 3b. The leg outer cylinder 20a is slidably fitted into the leg outer cylinder 19a and constitutes the lower part of the leg 3b.
Is a central portion of the upper tread plate 5b, formed from the rear to the front, and
b is penetrated in the upper tread slot 37 in a direction parallel to the upper tread projecting support portion 15a, and the length of the leg 3b is A (the lock pin 22 is used for the leg). Hole 21a 'of outer cylinder 19a and hole 21b of inner cylinder 20a for leg
B (when the lock pin 22 is penetrated through the hole 21a 'of the leg outer cylinder 19a and the hole 21c of the leg inner cylinder 20a) or C (lock pin 22).
With the hole 21a 'of the outer cylinder 19a for the leg and the inner cylinder 20a for the leg.
(When penetrated through the hole 21d), the elongated hole support that is fitted and locked to the rear leg locking portions 24a, 24b, 24c protruding from the leg 3b and holds the upper tread plate 5b horizontally. Department. The auxiliary leg 27 is fixed by a holding member 30 fixed to the side of the leg 3b.

With respect to the foldable elevator according to the third embodiment having the above-described configuration, a. During storage (when folded) b. The operation at the time of opening the legs (at the time of standing use) is the same as that described in the first embodiment, and the description is omitted.

Next, the folding elevator according to the third embodiment will be described with reference to c. The operation at the time of changing the height (at the time of standing use) will be described below. c. When the height is changed (when standing up) When the lock pin 22 penetrated through the holes 21a 'and 21a formed in the leg 3b is removed, the inner cylinder 20a for the leg is slid into the outer cylinder 19a for the leg. After the position of the hole 21a 'drilled in the leg outer cylinder 19a and the position of the hole 21b or 21c or 21d drilled in the leg inner cylinder 20a are matched, the lock pin 22 is moved. Through the hole 21a 'drilled in the leg outer cylinder 19a, the length of the leg 3b can be changed. Then, the elongated hole erection support part 38 is
When the length of the leg 3b is A, the fitting and locking is performed by the rear leg locking portion 24a. When the length of the leg 3b is B, the fitting and locking is performed by the rear leg locking portion 24b. When the length of 3b is C, the rear leg locking portion 2
When fitted and locked at 4c, the upper step board 5b is held horizontally, and the foldable elevator 1b in which the reaching height of the upper step board 5b is reduced is formed.

As described above, since the foldable elevator according to the third embodiment is configured, it has the following operation in addition to the operation of the first embodiment. (1) The shaft portion provided between the pair of left and right leg shaft attachment portions serves as a handrail when a person works on the upper tread plate, and the posture during the work can be kept stable, and the safety is excellent. (2) It is a tripod with two front legs and one leg, and the length of the auxiliary legs is adjustable, so it is difficult to stand stably on a ground contact surface such as a garden or orchard because there are many undulations. Even in this case, all the grounding portions can be grounded, and the stability is excellent. (3) The upper footboard is widened from the rear part to the front part so that the outer edge is inside the triangle formed by the grounding part of the two front legs and the grounding part of the rear leg. The center of gravity of the foldable elevator is stable even when it gets on the edge of the tread plate, and it does not fall over and is excellent in safety.

(Embodiment 4) FIG. 11 shows Embodiment 4 of the present invention.
It is a perspective view of the folding type elevator in. Note that the same components as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the figure, 1c is a foldable elevator in the fourth embodiment, and 3c is different from the rear leg 3 described in the first embodiment in that the telescopic adjustment portion is not formed and the front leg 2 and the rear leg 3c have substantially the same length. A pair of left and right rear legs 7a formed at a fixed length is a tread plate having both ends fixed to the front leg 2.

As described above, since the foldable elevator according to the fourth embodiment is configured, the number of constituent members is small, so that the manufacturing cost can be reduced and the cost is excellent.

In this embodiment, the case where a plurality of upper foot plate locking portions 14 are formed has been described. However, since the lengths of the front leg 2 and the rear leg 3c are fixed, the upper foot plate locking portion 14 is fixed. The portion 14 may be formed at one place. Further, the case where the front leg 2 and the rear leg 3c are formed to have substantially the same length has been described, but they may be formed to have different lengths. In particular, when the rear leg 3c is formed to have a shorter length than the front leg 2, the area of the upper step plate 5 can be increased, and the upper step plate 5 can be brought closer to the work place, so that the stability is excellent. The distance between the leg attachment portion 4 and the upper surface of the upper tread plate 5 is preferably 80 to 140 cm. When this distance is 80 to 140 cm,
Is located in the vicinity of the waist of the worker who has risen to the upper step board 5, which can prevent the worker from falling left and right, which is preferable. 80
cm, it depends on the height of the worker,
The leg axle 4 is lower than the waist of the worker, and the posture of the worker tends to be unstable. If it is larger than 140 cm, the leg axle 4 tends to obstruct the work. Is also not preferred.

(Embodiment 5) FIG. 12 shows Embodiment 5 of the present invention.
FIG. 13 is a perspective view of a foldable elevator according to a fifth embodiment of the present invention, from which a detachable rear leg 3 of the foldable elevator 1 is removed. Note that the same components as those described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
In the drawing, 1d is a ladder-type folding elevator in the fifth embodiment, 9a is a rotatable pivotally attached to the lower end of the front leg 2, and is uneven on the ground contact surface against sliding in the front-rear direction. A front leg grounding portion having an opening 9b through which a stake can be penetrated and having a trapezoidal side surface;
Link rod grounding, which has an opening 10c which is rotatably pivotally attached to the lower end portion of the camshaft 0 and is provided on the grounding surface so as to resist slippage in the front-rear direction, and which can penetrate a pile, and has a trapezoidal side surface. Reference numeral 39 denotes a horizontal rail such as a construction scaffolding frame at a construction site or the like, which is fitted into a concave portion of the upper step board engaging portion 14 provided on the lower surface of the upper step board 5.

The operation of the foldable elevator 1d according to the fifth embodiment configured as described above when standing up on an erecting scaffold frame or the like at a construction site will be described below. After the horizontal rail 39 such as a construction scaffold frame at a construction site or the like is locked by the upper tread plate locking portion 14 on the lower surface near the rear end of the upper tread plate 5, the upper tread plate 5
And the positions of the front leg grounding portion 9a and the link rod grounding portion 11a respectively provided at the lower ends of the front leg 2 and the link rod 10 in consideration of the inclination angles of the front leg 2 and the link rod 10 so that the tread plate 7 is horizontal. To determine. Next, when the stakes are driven into the openings 9b and 10c and fixed so that the front leg contact portion 9a and the link rod contact portion 11a do not rise from the ground, the foldable elevator 1d grounded at the four contact portions.
Is formed.

Here, the horizontal rail 39 is locked by the upper stepping plate locking portion 14 on the lower surface near the rear end of the upper stepping plate 5, even if a person gets on any part of the upper stepping plate 5. Is stably held horizontally between the upper step board pivoting portion 6 and the horizontal rail 39. The auxiliary leg may be fixed to the fixing member 30 protruding from the side surface of the front leg 2. Thereby, the stability of the foldable elevator 1d can be increased.

As described above, the foldable elevator according to the fifth embodiment has the following functions. (1) The foldable elevator is supported by the front foot landing portion fixed to the ground and the upper tread plate retaining portion which retains the link rod grounding portion and the horizontal rail, and thus is excellent in stability. (2) Since the area of the upper tread is large, a large number of scaffolds can be taken when a person works or walks on the upper tread, which stabilizes the posture and places materials and tool boxes. It is not only excellent in workability but also excellent in safety and functionality. (3) Since the tread plate is disposed between the front leg and the link rod and has a depth, the foot can be firmly put on the tread plate, and the posture at the time of ascending and descending and work is stable, and the safety is excellent. (4) The parallelogram link body is formed by the upper step board, the step board, the front leg, and the link rod, and the reaching height of the upper step board can be set arbitrarily. It can be installed on a horizontal rail, and is excellent in safety and versatility.

(Embodiment 6) FIG. 13 is a sectional view taken along line X--X in FIG.
FIG. 14 is a cross-sectional end view taken along line YY of FIG. 10. In the figure, a front leg 2a is formed of a hollow tube having a J-shaped cross section and a thick front portion, and a leg inner cylinder 20a constituting a leg 3b has a hollow circular cross section and a hollow portion. (A) a cross-shaped or (b) spoke-shaped reinforcing member is formed or arranged in a hollow tube. In addition, the circular pipes such as the upper step board pivot portion 6 and the step plate front pivot portion 8 are also hollow tubes having a hollow circular cross section and a cross-shaped or spoke-shaped reinforcing member formed in the hollow portion. May be formed. Further, not only the leg portion 3b but also the inner cylinder 20 of the rear leg 3 has a hollow circular or hollow square cross section, and a cross-shaped or spoke-shaped reinforcing member is formed or disposed in the hollow portion. It may be formed of a tube.

As described above, the foldable elevator according to the sixth embodiment has the following functions. (1) The front leg, which has a J-shaped cross section and a thick front portion, can be easily gripped, so that even if the front leg is gripped by a hand with oil, the finger is hardly caught and slips, so that the safety is excellent. (2) The hollow tube on which the reinforcing member is formed or disposed is lightweight, easy to carry, and has high strength, so that it can be used for carrying heavy objects, and is lightweight and safe. Excellent.

[0063]

As described above, according to the folding elevator of the present invention, the following advantageous effects can be obtained. Claim
According to the invention described in (1), (1) the upper tread plate locking portion disposed on the lower surface of the upper tread plate locks the upper tread plate support portion laterally provided on the rear leg, and the upper tread plate is held horizontally, The open angle of the front leg and the rear leg is fixed by the triangle formed by the front leg, the rear leg, and the upper tread, so that when a person goes up to the upper tread and performs work, the upper tread support is always locked by the upper tread. Provided is a highly safe foldable elevator that can prevent accidents in which the upper footplate locking part is released during operation and the foldable elevator can be opened and fall down due to the force of fitting into the part. can do. (2) Since the upper stepping plate engaging portion is formed on the lower surface of the upper stepping plate and is engaged with the upper stepping plate support portion provided on the rear leg to hold the upper stepping plate horizontally, the area of the upper stepping plate is increased. It is possible to take up a lot of footholds when people stand on the upper tread and work, so that the posture is stabilized and materials and tool boxes etc can be placed, which is not only excellent in workability Instead, a foldable elevator with excellent safety and functionality can be provided. (3) The angle between the front leg and the rear leg can be changed by changing the position of the upper foot plate locking portion that locks the upper foot plate support portion. Therefore, a foldable elevator with excellent safety can be provided which can select a grounding place without obstacles and stably stand it. (4) Further, by changing the opening angle of the front and rear legs,
The height of the upper step board can be changed according to the reaching height desired by the operator, and a folding type elevator with excellent functionality can be provided. (5) Since the rear legs are detachably fixed, when the rear legs are removed, a ladder-type folding elevator that can be locked to a horizontal rail or the like of a construction scaffold frame or the like at a construction site is obtained. And a folding type elevator which is excellent in quality can be provided.

According to the invention described in claim 2, according to claim 1
In addition to the effects of (1), since the tread is disposed between the front leg and the link rod and has a depth, the foot can be firmly placed on the tread, and the posture is stable as going up and down the stairs, and the safety is excellent. A collapsible elevator can be provided. (2) Since the upper step board, the step board, the front legs, and the link rod form a parallelogram link body, when the upper step board is horizontal, the link board can also make the step board horizontal at the same time, and when the upper step board is closed, the step board is closed. Can be folded at the same time, and a folding elevator with excellent functionality can be provided.

According to the invention described in claim 3, according to claim 1
Or in addition to the effect of 2, the upper footboard and the footboard can be held horizontally even when the opening angle of the front leg and the rear leg is changed,
A foldable elevator with excellent workability can be provided.

According to the fourth aspect of the present invention, the first aspect is provided.
In addition to the effects of any one of (1) to (3), (1) Since the legs are connected above the upper stepping plate and penetrate through the long hole of the upper stepping plate provided in the upper stepping plate, the legs of the folding type elevator are set up. At least three grounding parts are required at the time of installation, so even if it is difficult to stand stably because there are many undulations on the grounding surface such as a garden or orchard, all the grounding parts can be grounded and stable It is possible to provide a foldable elevator with excellent performance. (2) Since the shaft portion that connects the shaft pivot portion is provided above the upper tread plate, the shaft portion can be gripped when a person works on the upper tread plate. It is possible to provide a folding elevator capable of maintaining a stable posture and having excellent safety.

According to the invention set forth in claim 5, according to claim 1,
In addition to the effects of any one of (1) to (4), since the rear leg is provided with a telescopic adjustment portion capable of greatly expanding and contracting the length of the rear leg, the reaching height of the upper tread can be changed greatly to a desired height. , Because the upper tread can be held horizontally, the worker can work in a stable posture by climbing to the top upper tread adjusted to the desired height, which is excellent in safety and functionality A collapsible elevator can be provided.

According to the invention of claim 6, according to claim 4,
Or (5) In addition to the effects described in (5), (1) Since the upper step board locking portions are formed on both sides of the upper step board long hole portion, the upper step board projecting support portions projecting from both sides of the legs are balanced. It is possible to provide a foldable elevator that is well locked and has excellent stability. (2) Since the rear leg locking portion locks the elongated hole support portion and holds the upper tread plate horizontally, the worker can work in a stable posture on the upper tread plate and is excellent in safety. A foldable elevator can be provided.

According to the invention of claim 7, according to claim 2,
In addition to the effect of any one of the above, the link rod having the ground contact portion in addition to the front leg and the rear leg supports the load of the foldable elevator and the person, so that the stability of the foldable elevator is increased and the load is reduced. It is possible to reduce the load-bearing capacity of each leg that is dispersed, to reduce the weight of the members constituting the leg, and to provide a foldable elevator that is excellent in stability and lightweight.

According to the invention of claim 8, according to claim 1,
In addition to the effects of any one of (1) to (7), (1) Since a tension member such as a wire or a chain surrounds the upper tread, it is possible to prevent a person from stepping off the foot or falling off the body from side to side and falling. Thus, it is possible to provide a foldable elevator with excellent safety. (2) Even when the upper tread support portion is disengaged from the upper tread retaining portion that holds the upper tread horizontally, and the upper tread cannot be held horizontally, a tension member such as a wire or a chain stretches the upper tread. Therefore, it is possible to provide a foldable elevator capable of maintaining the level of the upper step board and having excellent safety.

According to the ninth aspect of the present invention, the first aspect is provided.
In addition to the effects described in any one of (1) to (8), (1) To provide a foldable elevator with excellent safety that can prevent the erected elevator from falling down in the lateral direction. Can be. (2) The location where the auxiliary leg is fixed and the length of the auxiliary leg can be changed according to the undulation of the installation location, obstacles, and the like, and a folding elevator with excellent versatility can be provided.

According to the tenth aspect of the present invention, in addition to the effects of any one of the first to ninth aspects, (1) the front leg having a J-shaped cross section and a thick front portion is easily gripped. Since it can be held, even if it is gripped with a hand to which oil is attached, a finger is hardly caught and slips, so that a foldable elevator with excellent safety can be provided. (2) The hollow tube on which the reinforcing member is formed or disposed is lightweight, easy to carry, and has high strength, so that it can be used for carrying heavy objects, and is lightweight and safe. An excellent foldable elevator can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a foldable elevator according to a first embodiment of the present invention.

FIG. 2 is a side view of the foldable elevator according to the first embodiment.

FIG. 3 is a side view of a tread plate.

FIG. 4 is a side view of the upper step board.

FIG. 5 is a perspective view of a pivot portion of the auxiliary leg.

FIG. 6 is a side view showing a folded state of the foldable elevator.

FIG. 7 is a side view showing a state in which the height of the foldable elevator is reduced to approximately half;

FIG. 8 is a side view of a main part of an upper part of the foldable elevator according to the second embodiment using the foldable elevator according to the first embodiment.

FIG. 9 is a perspective view of the main part of the upper part of the rear leg of the foldable elevator according to the second embodiment.

FIG. 10 is a perspective view of a foldable elevator according to the third embodiment.

FIG. 11 is a perspective view of a foldable elevator according to the fourth embodiment.

FIG. 12 is a perspective view of a foldable elevator according to the fifth embodiment.

13 is a sectional end view taken along line XX of FIG.

FIG. 14 is a sectional end view taken along line YY of FIG. 10;

[Explanation of symbols]

 1, 1a, 1b, 1c, 1d Folding type elevator 2, 2a Front leg 3, 3a, 3c Rear leg 3b Leg 4 Leg shaft attachment 5, 5a, 5b Upper tread plate 6 Upper tread plate pivotal joint 7, 7a Tread plate 8 Tread plate front pivoting part 9, 9a Front leg grounding part 9b, 10c Opening 10 Link rod 10a Link rod outer cylinder 10b Link rod inner cylinder 11, 11a Link rod grounding part 12 Link rod pivoting part 13 Tread plate rear pivoting Part 14 Upper Step Board Locking Section 15 Upper Step Board Supporting Section 15a Upper Step Board Protruding Support Section 16, 17 Engagement Member 18 Stretching Member 19 Rear Leg Outer Cylinder 19a Leg Outer Cylinder 20 Rear Leg Inner Cylinder 20a Leg Inner cylinder for use 21a, 21a ', 21b, 21c, 21d Hole 22 Lock pin 23 Protrusion support 24a, 24b, 24c Rear leg lock 25 Rear leg ground 26 Reinforcement bar 27 Auxiliary leg 28 Fixing 29 Elongate hole Department 9a Upper long hole portion 29b Lower long hole portion 30 Fixing member 31 Auxiliary leg outer cylinder 32 Auxiliary leg inner cylinder 33 Auxiliary leg grounding portion 34 Holding portions 34a, 34b, 34c, 34d Groove portion 35 Rear leg bridge support portion 36 Shaft portion 37 Upper step board long hole 38 Long hole erection support part 39 Cross rail

Continuation of the front page (71) Applicant 300042856 Kenji Matsui 3-14-39 Yukawashinmachi, Kokura-minami-ku, Kitakyushu-shi, Fukuoka Prefecture (71) Applicant 300042867 Kazuyoshi Kawakami 103-5 Keiko Nakagawacho, Chikushi-gun, Fukuoka Prefecture (72) Inventor Matsuyuki Hiroyuki 3-14-39 Yukawashinmachi, Kokuraminami-ku, Kitakyushu-shi, Fukuoka F-term (reference) 2E044 AA06 BA04 BC07 CA05 CA07 CB04 CC01 DA04 DB01 DC09 EA05 EB01 EC04 EC06 EC09

Claims (10)

[Claims] 1. A pair of left and right front legs, a pair of rear legs, a leg axle attachment portion for connecting the respective upper portions of the rear legs to the respective upper portions of the front legs rotatably or detachably, and An upper tread plate rotatably connected to both sides of a front portion at a predetermined portion of each upper portion, at least one or more tread plates having both ends connected to each of the front legs, and horizontally disposed above the rear legs. An upper tread plate supporting portion, and an upper tread plate disposed on a lower surface of the upper tread plate to lock the upper tread plate supporting portion, determine an opening angle of the front leg and the rear leg, and hold the upper tread plate horizontally. A locking part,
A foldable elevator comprising: 2. A step plate front pivoting portion rotatably connecting front sides of the step plate with each of the front legs, and the lower surface of the upper step plate while holding the upper step plate and the step plate in parallel. And a pair of right and left link rods rotatably connected to the front leg and a rear portion of the tread plate, and provided in parallel with the front leg. . 3. A protruding support portion protruding from both sides of a rear portion of the upper tread plate, and a rear leg locking portion formed on the back side of the rear leg to lock the protruding support portion. The foldable elevator according to claim 1 or 2, wherein: 4. In place of the pair of rear legs, a shaft portion that connects the leg shaft attachment portions above the upper step plate, and a shaft that is vertically provided downward from a center portion of the shaft portion to form the upper step plate. The foldable elevator according to any one of claims 1 to 3, further comprising a leg portion penetrating the provided upper tread plate slot. 5. A method according to claim 1, wherein: a. A telescopic adjuster disposed on the rear leg or the leg for adjusting the leg length; b. A pair of left and right holding portions disposed on the rear side of the rear leg above the upper foot plate support portion, and the upper foot plate is detachably mounted on the holding portion and is locked by the upper foot plate locking portion. The foldable elevator according to any one of claims 1 to 4, further comprising at least one of a rear leg erection support portion that holds horizontally. 6. An upper tread plate projecting support portion protruding on both sides of the leg portion, or an upper tread plate long hole portion formed at a center portion of the upper tread plate from a rear portion to a front portion and penetrating the leg portion. And an upper tread engaging portion formed on both sides of the upper tread elongated hole portion,
A long hole support portion provided at a rear end of the long hole portion of the upper tread plate; and a rear portion of the leg portion protruding from a rear side above the upper step plate support portion to lock the long hole support portion. The foldable elevator according to claim 4 or 5, further comprising a rear leg locking portion that holds the upper step board horizontally. 7. The link rod according to claim 2, wherein the link rod has a grounding portion at a lower end.
4. The foldable elevator according to claim 1. 8. A fastening member for fastening a stretching member such as a wire or a chain to a rear portion of the upper step board and an upper portion of the front leg or the rear leg, and is stretched between the fastening members. The foldable elevator according to any one of claims 1 to 7, further comprising a tension member such as a wire or a chain. 9. An auxiliary leg fixing member formed on a side or rear portion of the front leg and / or the rear leg, one end portion is detachably fixed by the fixing member, and the other end portion is formed to be stretchable. The foldable elevator according to any one of claims 1 to 8, further comprising an auxiliary leg. 10. The foldable lift according to claim 1, wherein the front leg and / or the rear leg or the leg is formed of one of the following. vessel. (A) A hollow tube having a J-shaped cross section and a thicker front portion. (B) A cross-shaped or spoke-shaped reinforcing member is formed or disposed in a hollow portion having a hollow circular or hollow square shape. Hollow tube