JP3167424U - Stepladder with support legs for movement - Google Patents

Abstract

An object of the present invention is to provide a stepladder with a movable supporting leg that can be easily moved and turned without bearing the entire weight of the stepladder main body. The apparatus includes a fixed ladder leg, a rotating supporting leg, a moving supporting leg, and a moving supporting leg storage device. The fixed ladder leg has a ladder shape in which an upper end portion is fixed to a top plate and stands upright. The upper end of the rotation support leg is pivotally supported by the top plate and stands up and down in an inverted V-shape. The support leg for movement is pivotally supported at the upper end to the bottom of the top plate so as to be rotatable in a pendulum shape, and a movable caster is provided at the lower end. In the moving support leg storage device, the fixed ladder leg and the rotating support leg are opened from the contact position with the fixed ladder leg by the operating lever, the universal joint, the rotating shaft stopper, and the lock mechanism. Move and fix between the center position in the state. [Selection diagram] Fig. 1

Description

  The present invention relates to a stepladder with a supporting leg for movement that can be easily moved and turned without burdening the entire weight of the stepladder body.

  Conventionally, the movement of a foldable stepladder used indoors or outdoors has to be shifted laterally with the stepladder open, or the stepladder body must be lifted and moved, which is cumbersome. It required labor.

  On the other hand, moving and changing the direction of a large stepladder with a height of 3m or more requires lighter work and operability when there are obstacles in the vicinity or the grounding surface is not flat. And stability was required.

  Conventionally, a stepladder for movement that attempts to solve the above-described problems has been proposed. For example, the ladder leg is formed in a substantially stepladder with a top board, a ladder leg pivotally supported on the top board and attached to the top board so as to be openable and closable, and a support leg having an upper end fixed to the top board. And the support legs are formed to be extendable so that the length can be changed. A ceiling handrail is rotatably attached to the top plate, and an opening stopper is provided between the ladder legs and the support legs. A “working scaffold that can be expanded and contracted” (see Patent Document 1), which is detachably provided, has been proposed and is a known technique.

  However, the above-mentioned “work platform that can be expanded and contracted” (see Patent Document 1) has a compact structure in which the ladder legs and the support legs are formed to be extendable and detachable, and moved to the main points of the support legs. Although it is a working scaffold that makes it easy to carry and move in a narrow place with a caster for transportation, it has moving means when there are obstacles around the work and the grounding surface is not flat In addition, a large space is required to change the direction of steering.

  In addition, a base is provided on the inside upper part of the stepladder body on the left and right, a direction snake linked to a caster that is pivotally attached to each of the left and right bases, which is attached to the right and left bases, a brake rod is provided, and a traveling handle is provided. A “running stepladder” (see Patent Document 2), in which a footrest is suspended, is a known technique.

  However, the above “traveling stepladder” (see Patent Document 2) employs means for moving the stepladder by operating the traveling handle while the worker is on the stepladder, but the worker is on the stepladder. It is dangerous from the viewpoint of safety, and the traveling handle to be operated has a complexity that exceeds the purpose of using the stepladder, and if the grounding surface is inclined, uneven, or soft It became unnecessary, and it was hard to say that it was a stepladder that was easy to use.

  In view of the current situation of stepladders for movement as described above, the present applicant has a high degree of freedom in changing the direction, and even with a large stepladder of 3 m or more, the weight burden during movement is small, and the traveling ground plane is We have developed and researched a folding stepladder that is easy to carry and move even on slopes, bumps, and soft grounds, leading to the proposal of a stepladder with support legs for movement in the present invention.

JP-A-5-98795 JP-A-6-288168

  In view of the above problems, the present invention aims to provide a stepladder with a supporting leg for movement that can easily move and turn without burdening the entire weight of the stepladder body.

  A stepladder with a support leg for movement according to the present invention is a stepladder with a support leg for movement having a support leg for movement at the center of a stepladder that is opened in an inverted V shape, and includes a fixed ladder leg, a rotating support leg, The fixed ladder leg has a ladder shape in which an upper end portion is fixed to a top plate, and has a ladder shape, and is located between the ladder steps of the fixed ladder leg. The swing support leg is pivotally supported by an open leg width adjusting member that is arranged horizontally with a drop groove for adjusting the open leg width. The upper end of the pivot support leg pivots on the top plate. It is supported so that it can be opened and closed in an inverted V shape, and is provided with a latching rod for latching a dropping groove of the opening leg width adjusting member at the middle position and the lower position of the rotation support leg, The support leg for movement is pivotally supported by the bottom part of the top plate so as to be pivotable in a pendulum manner. The intermediate portion is loosely fitted into a guide opening provided in the opening leg width adjusting member, and a lower end is provided with a movable caster for movement, and the total length is shorter than the fixed ladder leg and the rotation support leg, In addition, the movable support leg storage device has a structure that is longer than the height from the ground surface to the top plate at the time of opening the leg, and the movable support leg storage device includes the movable lever, the operation lever, the universal joint portion, and the rotating shaft. The fixed ladder includes a mechanism for moving and fixing between the fixed ladder leg and the pivot support leg between the contact position with the fixed ladder leg and a center position in the open leg state by a stop portion and a lock mechanism. Means that allows the leg and the pivot support leg to easily move and turn even in the open leg state are adopted.

  Further, the stepladder with a supporting leg for movement of the present invention adopts a means in which the rotating supporting leg has substantially the same shape as the fixed ladder leg.

  Further, the stepladder with a support leg for movement of the present invention adopts a means in which a length adjusting mechanism is provided at the lower end portion of the support leg for movement to facilitate movement during storage.

  According to the stepladder with the support leg for movement of the present invention, the support leg for movement is provided at the center of the stepladder that is opened in an inverted V shape, and the upper end is pendulum-like at the center of the lower part of the top plate perpendicular to the ladder step. Pivotable at the lower end, and a movable caster at the lower end (the movable caster 31 in this document includes a free wheel with a caster angle, a free wheel without a caster angle, and a fixed car) And the overall length is slightly shorter than that of the fixed ladder legs and the rotating ladder legs, so that it is possible to easily perform traveling operations such as forward movement, backward movement, meandering, and turning.

  Further, according to the stepladder with a supporting leg for movement of the present invention, by standing in a state where the stationary ladder leg and the rotating ladder leg are opened in an inverted V shape around the supporting leg for movement, Since the entire weight of the stepladder body is applied to the free caster provided at the lower end of the moving support leg, an excellent effect of being able to easily move without burdening the weight of the stepladder body is achieved.

  Further, according to the stepladder with a support leg for movement of the present invention, by running with a balance in a state where the fixed ladder leg and the rotating ladder leg are opened in an inverted V shape around the support leg for movement, Stable running performance is maintained even when the ground contact surface is sloped, uneven, or soft, and when the slope angle is steep, the rotation support leg can be removed from the opening width adjustment drop groove of the opening leg width adjusting member. By removing the latching rod and increasing the open leg state, there is an excellent effect that the free caster can easily move away from the ground contact surface.

  In addition, according to the stepladder with a support leg for movement of the present invention, the stepladder with a support leg for movement is composed of a very simple structure of a fixed ladder leg, a rotating ladder leg, and a support leg for movement. It is easy to use at the time of installation and has the excellent effect of being easy to carry and move.

It is a whole perspective view which shows embodiment of Claim 1 to the stepladder with the support leg for a movement of this invention. It is explanatory drawing which shows the operating state of the support leg storage apparatus in the stepladder with the support leg for a movement of this invention. It is expansion explanatory drawing which shows the operation state of the support leg storage apparatus in the stepladder with a support leg for a movement of this invention. It is explanatory drawing which shows the retracted state in the stepladder with the support leg for a movement of this invention. It is a whole perspective view which shows embodiment of Claim 2 in the stepladder with the support leg for a movement of this invention. It is a whole perspective view which shows embodiment of Claim 3 in the stepladder with the support leg for a movement of this invention.

  The stepladder with a support leg for movement of the present invention is provided with a support leg for movement at the center of the stepladder that is opened in an inverted V shape, so that the fixed ladder leg and the rotation support leg can be easily moved and moved even in the open leg state. Hereinafter, an embodiment will be described with reference to the drawings, which is characterized by the fact that the stepladder with a supporting leg for movement that can turn is adopted.

FIG. 1 is an overall perspective view showing an embodiment of claim 1 in a stepladder with a supporting leg for movement of the present invention.
The stepladder 1 with a movement support leg is a stepladder with a movement support leg 30 having a movement support leg 30 at the center of a stepladder that is opened in an inverted V shape, and includes a stationary ladder leg 10 and a rotation support leg 20. The moving support leg 30 and the moving support leg storage device 40 are configured so that the fixed ladder leg 10 and the rotating support leg 20 can be easily moved and turned even in the open leg state.

  The fixed ladder leg 10 has a ladder shape with an upper end fixed to the top plate 50 and has a standing leg, and an intermediate leg of the ladder step part 11 is horizontally mounted on the hanging rod 21 of the rotation support leg 20 and is opened. An opening leg width adjusting member 12 for adjusting the width is pivotally fixed to be formed.

  The opening leg width adjusting member 12 is pivotally supported by the intermediate part of the ladder step part 11 of the fixed ladder leg 10 and is horizontally mounted on the hanging rod 21 of the rotation support leg 20. The width of the leg 14 is adjusted by dropping the groove 14, the support leg 30 for movement is loosely fitted and supported by the guide opening 13 provided on the upper surface, and the lateral strength of the rotating support leg 20 is reinforced. It is. The position is not limited to the position on the drawing, and the operator sets the moving support leg storage device 40 at a position where the operator can easily work according to the total length of the stepladder 1 with the moving support leg, and the moving support leg. The positional relationship of the storage device 40 is determined so as not to interfere with each other. Furthermore, it is desirable to consider the moment applied to the fixed ladder leg 10 and the rotation support leg 20 in the cantilever state below the open leg width adjusting member 12.

  The pivot support leg 20 is pivotally supported by a top plate 50 so that it can be opened and closed in an inverted V-shape, and an intermediate leg of the ladder step portion 11 has an opening width adjustment member 12 for adjusting the opening leg width. A latching rod 21 that is dropped into the dropping groove 14 and is latched is provided in the horizontal position of the opening leg width adjusting member 12 and in the vicinity of the lower end that is latched during storage.

  The upper end of the moving support leg 30 is pivotally supported on the bottom of the top plate 50 so as to be pivotable in a pendulum manner, and is provided on the opening leg width adjusting member 12 at the intermediate part of the moving support leg 30. A free caster 31 for movement is provided at the lower end of the guide opening 13, and the total length is shorter than the fixed ladder leg 10 and the rotating support leg 20, and from the ground surface T to the top plate 50 at the time of opening. It is formed in the structure which becomes in the range longer than the height of. In addition, it is also effective to allow the side of the top plate 50 to be recessed in an arch shape so that it can be stably installed on a suspended object having a circular cross-sectional view such as a tree.

  The free caster 31 is provided at the lower end portion of the moving support leg 30, thereby moving the fixed ladder leg 10 and the rotating support leg 20 in an inverted V shape around the moving support leg 30. The stepladder 1 with supporting legs is supported at one point on the ground surface T and the fulcrum O, so that movement and turning are easy.

  The moving support leg storage device 40 is configured to move the moving support leg 30 from the contact position with the fixed ladder leg 10 by the operation lever 41, the universal joint part 42, the rotation shaft stopping part 43, and the lock mechanism 44. And the pivot support leg 20 can be easily moved and turned between the center position in the open leg state. However, the structure is not limited to this, and any structure that can operate the moving support leg 30 forward and backward is acceptable. Moreover, it is not limited to the position on the drawing, and the operator may set the operation lever 41 at a position where the operator can easily work according to the total length of the stepladder 1 with the supporting legs for movement.

  The lock mechanism 44 includes a support ring 45 and a lock piece 46, and is interlocked with the operation lever 41 and the universal joint portion 42 of the moving support leg storage device 40. It operates by operation (see FIG. 3 for detailed description).

FIG. 2 is an explanatory view showing an operating state of the support leg storage device in the stepladder with a moving support leg of the present invention, and FIG. 2 (a) is an explanatory view showing a moving state of the stepladder 1 with the moving support leg. is there.
A state where the operation lever 41 of the moving support leg storage device 40 is extended to the maximum and locked by the lock mechanism 44 is shown.
The moving step of the stepladder 1 with the supporting leg for movement is such that the fixed ladder leg 10 and the rotating supporting leg 20 are maximally opened in an inverted V shape, and the supporting leg 30 for movement is provided at the center of the stepladder. It is fixed at the center position by the support leg storage device 40 and further moved while being locked by the lock mechanism 44.

FIG. 2B is an explanatory diagram showing a usage state of the support leg operating device.
A state where the operation lever 41 of the moving support leg storage device 40 is folded by the rotation shaft stopping portion 43 and locked by the lock mechanism 44 is shown.
When the stepladder 1 with a moving support leg is used, the fixed ladder leg 10 and the rotating support leg 20 are opened in an inverted V shape, and the moving support leg 30 is provided at the center of the stepladder. The storage device 40 is used in a state of being pulled toward the fixed ladder leg 10 and further locked by the lock mechanism 44.

FIG. 3 is an enlarged explanatory view showing the operating state of the support leg storage device in the stepladder with a support leg for movement of the present invention. FIG. 3 (a) is for movement when the support leg 30 for movement is located in the center. It is explanatory drawing which shows the locked state of the support leg storage apparatus.
An operation lever 41 having a universal joint portion 42 of a moving support leg storage device 40 is provided on a pivot shaft stopping portion 43 projecting in the direction of the fixed ladder leg 10 in the middle of the moving support leg 30. 45, the operation lever 41 is turned counterclockwise to be fitted into the lock piece 46 and locked, and the moving support leg 30 is opened by the fixed ladder leg 10 and the rotating support leg 20. By being locked at the center position of the state, the moving support leg 30 can be easily moved and turned by being grounded to the ground surface T with one point support of the fulcrum O.

FIG. 3B is an explanatory diagram showing a locked state of the support leg storage device 40 when the movement support leg 30 is stored.
An operation lever 41 having a universal joint portion 42 of a moving support leg storage device 40 is supported in a U-shape on a rotation shaft stopping portion 43 that protrudes in the direction of the fixed ladder leg 10 in the middle of the moving support leg 30. The movement support leg 30 is locked at a position close to the fixed ladder leg 10 because it is loosely fitted to the ring 45 and supported, and the operation lever 41 is tilted downward and fitted into the lock piece 46 to be locked. Thus, the moving support leg 30 can be easily accommodated by moving the support leg 30 shorter than the fixed ladder leg 10 and the rotating support leg 20 and away from the grounding surface.

In the case of changing from the open leg state to the closed leg state, if the operation lever 41 is operated while lifting the fixed ladder leg 10 slightly, the end of the moving support leg 30 becomes a fulcrum, and the fixed ladder leg is based on the pendulum principle. The leg can be easily closed by 10 dead weights. On the other hand, in the case of changing from the closed leg state to the open leg state, if the end of the fixed ladder leg 10 is used as a fulcrum and the operator is slightly pulled and the operation lever 41 is operated, the end of the support leg 30 for movement The free caster 31 provided on the ground is grounded to the ground surface T, and thereafter, the rotary support leg 20 and the fixed ladder leg 10 can be easily opened with the free caster 31 as a fulcrum.

  Further, the opening leg width adjusting member 12 is pivotally supported at the intermediate part of the ladder step part 11 of the fixed ladder leg 10, is horizontally mounted on the latching rod 21 of the rotating support leg 20, and is dropped into the opening leg width adjusting dropping groove 14. The width of the opening leg is adjusted, and the supporting leg 30 for movement is loosely fitted and supported by the guide opening 13 provided on the upper surface, and further the strength of the rotating supporting leg 20 is strengthened in the lateral direction. .

  Then, the opening width adjustment operation of the fixed support leg 10 and the rotation support leg 20 is performed on the rotation support leg 20 in the opening leg width adjustment drop groove 14 arranged below the opening leg width adjustment member 12. The stop rod 21 is dropped and adjusted to a predetermined leg width.

Next, the movement state in the stepladder with the supporting leg for movement of this invention is demonstrated.
The moving support leg 30 is moved by being locked at the center position of the stepladder which is opened in an inverted V shape by the moving support leg storage device 40 in a state where the fixed ladder leg 10 and the rotating support leg 20 are opened. Since the supporting leg 30 is supported at one fulcrum O with respect to the ground surface T, the stepladder can be easily moved by applying a force from the lateral direction.

Next, the turning state of the stepladder with the supporting legs for movement of the present invention will be described.
The movement support leg 30 is locked at the center position where the fixed ladder leg 10 and the rotation support leg 20 are opened in the inverted V shape by the movement support leg storage device 40 in the open leg state. Since the leg 30 is supported at one fulcrum O with respect to the ground surface T, it is possible to easily turn the stepladder by applying a force in the rotational direction.

FIG. 4 is an explanatory view showing a retracted state in the stepladder with a supporting leg for movement of the present invention.
The operating lever 41 of the moving support leg storage device 40 is locked by the lock mechanism 44, and the opening leg width adjustment drop groove 14 arranged in the lower part of the opening leg width adjusting member 12 is arranged below the rotating support leg 20. The fixed ladder leg 10, the moving support leg 30, and the rotation support leg 20 are closed and stored by being hooked on the provided latching rod 21.

FIG. 5 is an overall perspective view showing an embodiment of claim 2 in the stepladder with a supporting leg for movement of the present invention.
The rotation support leg 20 is formed to have a ladder shape substantially the same shape as the fixed ladder leg 10 according to claim 1, and is moved to the center of a stepladder that is opened in an inverted V shape. A stepladder with a supporting leg for movement which can be easily moved and turned even when the fixed ladder leg 10 and the rotating supporting leg 20 are in the open leg state is provided with the supporting leg 30.

FIG. 6 is an overall perspective view showing an embodiment of claim 2 in the stepladder with a supporting leg for movement of the present invention. A length adjusting mechanism 47 is provided at the lower end portion of the moving support leg 30 of the stepladder 1 with the moving support leg to facilitate the movement during storage. For example, by freely changing the overall length of the moving support leg 30 according to the hole position of the lock pin 48 of the length adjusting mechanism 47, the free caster 31 is grounded to the ground surface T even when the moving support leg 30 is stored. To be movable.

  The stepladder with supporting legs for movement of the present invention has been described with examples of large three-legged and four-legged stepladders having a total height of 3 m or more that are opened in an inverted V shape. Since it can be widely used as a comparatively small stepladder for construction and horticulture, it is understood that the industrial applicability of the stepladder with a supporting leg for movement in the present invention is great.

DESCRIPTION OF SYMBOLS 1 Stepladder 10 with a supporting leg for movement Fixed ladder leg 11 Ladder step part 12 Opening leg width adjusting member 13 Guide opening part 14 Opening leg width adjusting drop groove 20 Rotating support leg 21 Hanging rod 30 Moving support leg 31 Free caster 40 Movement Support leg storage device 41 Operation lever 42 Universal joint portion 43 Rotating shaft stop portion 44 Lock mechanism 45 Support ring 46 Lock piece 47 Length adjustment mechanism 48 Lock pin 50 Top plate T Ground surface

Claims (3)

A stepladder with a support leg for movement comprising a support leg for movement at the center of a stepladder that is opened in an inverted V shape,
It is composed of a fixed ladder leg, a rotating support leg, a moving support leg, and a moving support leg storage device.
The fixed ladder leg has a ladder shape with an upper end fixed to the top plate and standing upright,
In the middle of the ladder step portion of the fixed ladder leg, an open leg width adjusting member that is arranged horizontally with a dropping groove for adjusting the open leg width is formed by pivotally supporting the rotating support leg,
The rotating support leg is erected such that its upper end is pivotally supported by the top plate and can be opened and closed in an inverted V shape,
At the middle position and the lower position of the rotation support leg, a latching rod for latching the dropping groove of the open leg width adjusting member is provided,
The support leg for movement is pivotally supported in a pendulum-like manner so that its upper end is pivotable to the bottom of the top plate,
An intermediate portion of the moving support leg is loosely fitted into a guide opening provided in the open leg width adjusting member,
The lower end is provided with a movable caster for movement,
The total length consists of a structure that is shorter than the fixed ladder leg and the pivot support leg, and within a range longer than the height from the ground surface to the top plate at the time of opening,
The moving support leg storage device is configured such that the moving support leg is rotated from the contact position with the fixed ladder leg by an operation lever, a universal joint part, a rotation shaft stopping part, and a lock mechanism. The support leg has a mechanism for moving and fixing between the center position in the open leg state,
A stepladder with a support leg for movement, wherein the fixed ladder leg and the pivot support leg can be easily moved and turned even in an open leg state. The stepladder with a supporting leg for movement according to claim 1, wherein the rotating support leg has a ladder shape substantially the same shape as the fixed ladder leg. The stepladder with a support leg for movement according to claim 1 or 2, wherein a length adjusting mechanism is provided at a lower end portion of the support leg for movement to facilitate movement during storage.

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