JPH0631118Y2 - Ladder and ladder - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a ladder that also serves as a stepladder.

(B) Conventional technology Conventionally, a ladder that also serves as a stepladder is provided with folding joint plates at the upper ends of a pair of left and right columns, and the joint plates are rotatably connected to each other so that the ladder can be folded. ing.

Further, by rotating the supporting column around the rotating portion of the folding joint plate, a stable stepladder or a long ladder is formed.

When working in a low position, a ladder that is also used as a stepladder is used stably as a stepladder, while when working in a high position, it is used as a ladder and vertically hung on a fence or the like.

In addition, the ladder combined with a ladder connects one end of the opening stop plate with a fixed length to one of the columns and pivotally connects the other end of the opening stop plate to the pin provided on the other column. Connected to.

When used as a stepladder or a ladder, such a stop plate keeps each strut in a fixed state, avoids the opening of each strut, and prevents a fall accident.

In addition, the opening stop plate is provided with a notch, the notch is locked to the pin, and a ring that engages with the pin is attached to the insertion hole so that the ring can be opened and removed. I try not to.

Furthermore, the ring is provided with an operating part at the bottom,
The operating portion is grasped by a finger, the ring is expanded, and the engagement between the ring and the pin is released.

In particular, the opening stop plate is connected to the other pillar so that each pillar does not come off when the ladder is in a ladder state.

(C) Problems to be Solved by the Invention However, the ladder and ladder as described above has the following drawbacks.

That is, when using the ladder as a ladder as the ladder state, the upper sides of the folding joint plates provided on the columns are joined to each other, but when used for many years, the upper end surface of the folding joint plate is worn. Therefore, when an operator uses the ladder, the upper end surface of the ladder may be easily displaced and the ladder may fall.

In addition, in order to solve the above problem, a stop plate is attached, but since the operation part of this stop plate is provided at the bottom of the ring, it is easy to release the engagement with the pin by the finger. It could not be done, thus reducing the maneuverability of this ladder.

An object of the present invention is to provide a ladder that can also be used as a stepladder that can solve the above problems.

(D) Means for Solving the Problems The present invention forms a pair of ladder main bodies by installing a plurality of cross rails between long columns that are arranged at parallel intervals. A rectangular flat plate-shaped folding joint plate is integrally attached to the upper outer surface of each of the columns of the main body, and a flat plate-shaped hinge is projected on one side of the folding joint plate, and the hinges are pivotally supported together. Pivotally supports the upper parts of the ladder body so that they can rotate freely at the maximum rotation angle until the upper end surfaces abut each other, and the opening-stopping metal fittings are detachably installed midway along the ladder body. In the ladder, on the upper end surface of the folding joint plate of the one-sided ladder main body, a flat plate-like fitting projection extending in the axial direction of the support column with a gap in the direction separating from the pivot pin, and a part of the upper end surface are provided. A protrusion fitting pocket formed by bulging outward is provided, while the ladder on the other side is provided. On the upper end surface of the folding joint plate of the main body, there is a gap in the direction away from the pivot pin, and a projection fitting pocket formed by bulging part of the upper end surface to the outside, and a flat plate extending in the axial direction on the column Stepladders, each of which is configured to be capable of abutting the upper end surfaces of the ladder bodies at the maximum rotation angle and to be fitted into a corresponding projection fitting pocket. It is related to a dual-purpose ladder.

(E) Action and effect In the present invention, a flat plate-like fitting protrusion extending in the axial direction of the column is provided on the upper end surface of the folding joint plate of the one-sided ladder body with a gap in the direction away from the pivot pin. , A projection fitting pocket formed by bulging a part of the upper end surface to the outside, on the other hand, on the upper end surface of the folding joint plate of the other side ladder main body, with a gap in the direction away from the pivot pin, A projection fitting pocket formed by bulging a part of the upper end surface to the outside and a flat plate-shaped fitting projection extending in the axial direction of the column are provided.

Therefore, at the maximum rotation angle for forming a ladder, the upper end surfaces of the ladder main bodies are brought into contact with each other, and the fitting projections provided on the upper end surfaces of the respective ladder main bodies correspond to the corresponding projections provided on the upper end surfaces of the respective ladder main bodies. It will be fitted in the fitting pocket.

Therefore, even if a large force is applied during use or the upper end surface of the joint plate is slightly deformed, it is possible to reliably prevent the occurrence of so-called'disagreement 'such that the end faces of the joint plates are not in contact with each other. .

Further, in the present invention, the joint plate can be manufactured very easily.
That is, it is possible to punch a hole with a single die by a press, then send it to punch out the outer shape, and then bulge a part of the upper end surface to the outside to form a projection fitting pocket.

Further, in the present invention, the protrusion and the protrusion fitting pocket are formed by slightly extending a part of the upper end surface of the joint plate in the axial direction and swelling the other part to the outside. When the ladder is used, it is possible to completely eliminate the inconvenience that an object hits the projection or the projection fitting pocket and is deformed, and it is possible to reliably use the stepladder as the ladder and the ladder as the stepladder.

(F) Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. In the side view of FIG. 1, A indicates a ladder for ladder use according to the present invention, and the ladder A is constructed as follows. There is.

That is, a pair of left and right struts 1 and 1 are arranged at regular intervals, and a short step rail 2 is installed between the struts 1 and 1 to form a ladder main body a.

Further, in this embodiment, the folding joint plates 3 and 4 are attached to the upper ends of the columns 1 and 1, and the columns 1 and 1 are rotated on the joint plates 3 and 4 via the pivot pins 5. The ladder body a is foldable.

In the ladder main body a, the left and right struts 1, 1 are formed in a substantially C-shape to form a stepladder having stability with respect to the ground or the like, or the folding joint plates 3, 4 are rotated to form the struts 1, 1 It can be used as a ladder with the two connected.

Further, in the ladder body a, the folding joint plates 3 and 4 attached to the columns 1 and 1 are configured as follows.

That is, in this embodiment, the folding joint plates 3 and 4 have a substantially rectangular shape and are attached to the upper side surfaces of the columns 1 and 1, and the hinges 6 project from the inner upper portions of the folding joint plates 3 and 4, respectively. The hinge 6 is rotatably connected to the hinge 6 via a pivot pin 5.

Further, as shown in FIG. 1, concave-convex fitting portions 7 are provided on the upper end surfaces 3a and 4a of the folding joint plates 3 and 4, and the ladder main body a is elongated by the fitting portions 7. When forming a ladder, the folding joint plates 3 and 4 are securely joined.

In this embodiment, the upper end surfaces 3a, 4a of the folding joint plates 3, 4 are partially bent laterally to provide projection fitting pockets 8 respectively, and the upper end surfaces 3a, 4a are fitted with projections 9a. Is protruding.

Moreover, the upper end surface 3a of the folding joint plates 3 and 3 of the one-side ladder body a
In addition, a flat plate-like fitting projection 9 extending in the axial direction of the column 1 and a projection fitting pocket 8 formed by bulging a part of the upper end surface 3a to the outside are provided in a direction away from the pivot pin 5. And the folding joint plates 4 and 4 of the other side ladder body 4 are provided.
A protrusion fitting pocket 8 formed by bulging a part of the upper end surface 4a outwardly on the upper end surface 4a of the support pin 5 in a direction away from the pivot pin 5, and a flat plate shape extending in the axial direction of the column 1. And the projection 9 of the
The upper end surfaces 3a, 4a of a can be brought into contact with each other, and the fitting projections 9, 9 can be fitted into the corresponding projection fitting pockets 8, 8, respectively.

FIG. 2 shows a state in which the folding joint plates 3 and 4 are joined,
The concave-convex fitting portion 7 including the projection fitting pocket 8 and the fitting projection 9 can prevent the joined folding joint plates 3 and 4 from coming off.

Further, in FIG. 1, the folding joint plates 3 and 4 are provided with the opening preventing metal fittings 10 of the respective pillars 1 and 1 in a erected state, and one of the pillars 1 can freely rotate one end of the metal fitting 10. The metal fittings are attached to the retaining pin 11
The other end of 10 is detachably connected.

Reference numeral 12 denotes a pin that pivotally supports the opening prevention metal fitting 10.

Further, in the present embodiment, the left side of the opening stopper 10 is
The locking portion 13 for the locking pin 11 is provided, and the locking portion 13 is locked to the locking pin 11 projectingly provided on the column 1, and the opening locking metal fitting 10 is mounted.

The locking portion 13 is formed by providing a cutout portion in the up-down direction on the opening stopper fitting 10, and is configured to be locked with the stop pin 11 by operating it from above.

Further, as shown in FIGS. 1 and 3, an engagement plate 14 for engaging with the stop pin 11 is attached to the opening stop metal fitting 10, and the engagement plate 14 is provided with a pin insertion hole 15. ing.

Then, the opening stop metal fitting 10 is fixed to the stop pin by the locking portion 13.
When the 11 is locked, the pin insertion hole 15 is attached to the stop pin 11 to ensure the connection.

Further, the engagement plate 14 is attached to the locking metal fitting 10 by a mounting pin 16
Is attached to the same pin 16 and
A spring 17 is attached to the and the metal fitting is urged in the direction of the metal fitting 10.

Further, a guide plate 18 that curves outward is provided below the pin insertion hole 15 of the engaging plate 14, and when the opening stopper fitting 10 is attached to the stopper pin 11, the pin 11 guides the same. The plate 18 is pressed so that the pin 11 can be easily inserted into the pin insertion hole 15.

Further, the guide plate 18 can be gripped by a hand and pressed outward to be attached / detached to / from the stop pin 11.

Reference numeral 19 indicates a receiving plate of the guide plate 18 provided on the opening stop fitting 10.

Furthermore, in the present embodiment, a stop pin is provided on the side of the engagement plate 14.
An operation part 20 for attaching to and detaching from the 11 is provided in a protruding manner. The operation part 20 is provided along the opening stop metal fitting 10, and further, the opening stop metal fitting 10 is bent outward so that the operation fulcrum portion 21 Is formed, and a fixed space is provided between the metal fitting 10 and the operating portion 20.

Then, by pressing the operation portion 20 via the operation fulcrum portion 21, the engagement plate 14 is floated up and easily attached to and detached from the stop pin 11.

As described above, the embodiment of the present invention has the following effects.

In the present invention, when the ladder A that is also used as a ladder is used as a ladder, the folding joint plates 3 and 4 attached to the upper ends of the columns 1 are rotated to make the columns 1 elongated, and at that time,
Fit the concave-convex fitting portion 7 provided on the upper side of each folding joint plate 3 and 4, and further attach the stop stopper plate 10 to each strut 1,
The columns 1 can be firmly connected.

At this time, the concave-convex fitting portion 7 is formed on the upper end surface of each folding joint plate 3, 4.
3a and 4a respectively include symmetrically provided fitting projections 9 and projection fitting pockets 8. When the upper end surfaces 3a and 4a come into contact with each other, the projection fitting pockets 8 to which the respective projections 9 correspond.
Since the folding joint plates 3 and 4 are fitted into the housing, the displacement of the folding joint plates 3 and 4 can be surely prevented, and a fall accident of the ladder can be avoided.

Further, in the present invention, one end of the opening stop plate 10 of one of the columns 1 is engaged with the stop pin 11 provided on the other column 1 to connect the columns 1, but when the ladder is folded up, In, the operation portion 20 of the engagement plate 14 provided in the same opening stop plate 10 is pressed to release the engagement between the pin insertion hole 15 of the engagement plate 14 and the stop pin 11,
The stop plate 10 can be removed from the column 1.

Therefore, according to the present invention, the operability of this ladder can be improved because the engagement of the opening stop plate 10 can be released by simply pressing the operating portion 20 of the engagement plate 14 provided along the opening stop plate 10. Can be improved.

[Brief description of drawings]

FIG. 1 is a side view of the stepladder / ladder according to the present invention as a stepladder, and FIG. 2 is a perspective view of the stepladder as a ladder.
Fig. 3 is a sectional view taken along the line I-I of Fig. 1, and Fig. 4 is Fig. 1 II-.
It is a II sectional view. In the figure, A: ladder combined with ladder, 1: strut 3, 4: folding joint plate, 7: concave and convex fitting part 8: projection fitting pocket, 9: fitting projection 10: opening stop plate, 11: stop pin 13: engagement Stop, 14: Engagement plate 15: Pin insertion hole, 20: Operation part

Claims (1)

[Scope of utility model registration request] 1. A plurality of cross rails are provided between long columns (1) (1) in which a pair of ladder bodies (a) (a) are arranged at parallel intervals.
Formed by erection (2), each ladder body (a) (a)
Attach the rectangular flat plate-shaped folding joint plates (3) (3) (4) (4) to the upper outer surfaces of the columns (1) (1) of the
(3) (3) (4) (4) with one side flat hinge (6) (6) (6) (6)
The hinges (6), (6), (6), (6) are pivotally supported by the pivot pin (5), and the upper parts of the ladder bodies (a) and (a) are rotated at the maximum rotation angle. The upper end surfaces (3a) (3a) (4a) (4a) are rotatably connected until they come into contact with each other, and the opening stop metal fitting (10) can be attached and detached midway along the ladder body (a) (a). In the erected ladder / combined ladder, the upper end faces (3a) (3a) of the folding joint plates (3) (3) of the one-sided ladder body (a)
, A flat plate-like fitting protrusion (9) extending in the axial direction of the column (1) (1) with a gap in the direction away from the pivot pin (5).
And a projection fitting pocket (8) formed by bulging part of the upper end surface (3a) (3a) to the outside, while the other side ladder body (a)
On the upper end face (4a) (4a) of the folding joint plate (4) (4), the pivot pin (5)
A projection fitting pocket (8) formed by bulging a part of the upper end surface (3a) (3a) outward with a space in a direction away from
And a flat plate-like fitting protrusion that extends in the axial direction of the columns (1) (1)
(9) is provided, and at the maximum rotation angle, the upper end surfaces (3a) (3a) (4a) (4a) of the ladder main body (a) (a) can be brought into contact with each other, and the fitting protrusion (9) ( 9), the corresponding projection fitting pocket
(8) A ladder that can also be used as a stepladder, which can be fitted in (8).