JPS5838879Y2 - stepladder - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a stepladder, and its purpose is to simplify the structure of the steps and step caps attached to the legs of the stepladder, making them easy and inexpensive to manufacture. Moreover, it is an object of the present invention to provide a stepladder which can be easily assembled and opened/closed.

The present invention will be described in detail below with reference to the accompanying drawings.

In Figures 1 to 6, 1 is a stepladder, which has a pair of left and right legs 2, 2' and an identical shape that connects and fixes the upper ends of each pair of legs 2, 2' at a predetermined interval. has
and a pair of upper rungs 3 disposed in left and right opposite directions,
3', and a pair of lower rungs 4, 4' having the same shape and arranged in mutually opposite directions, connecting and fixing each pair of legs 2, 2' at a predetermined intermediate position at a predetermined interval. , a connecting rotation shaft 5 that connects the pair of upper treadles 3, 3' to each other in an openable and closable manner at each back surface, and the pair of lower treadles 4, 4.
It is composed of an opening/closing fitting 6, an upper treadle cap 7, and a lower treadle cap 8, which are connected to each other at each back surface so as to be able to approach and separate from each other.

The attachments extending parallel to both sides of the legs of the upper step bars 3, 3' are bent from the bases 9, 10, the front part extending in an inclined manner from one of the bases 9, and the ends thereof, and are bent when the legs are opened. an upper surface 11 that forms a contact surface 11; a back surface 12 for forming a contact surface that hangs downward at right angles from the rear end of the upper surface; A shaft detachment prevention part 14, a coupling part 16 having an opening 15 for inserting the rotating shaft coupling part formed between the upper surface of the detachment prevention part 14 and the lower end of the back surface, and a base 10 for mounting on the lower surface and inside of the coupling part.
As shown in FIG. After inserting
By caulking both ends of the connecting part, a pair of upper treadles 3
, 3' are connected to each back surface portion 12 so as to be able to come into contact with and separate from each other.

The upper treadle cap 7 is formed so that the upper treadle can be attached to the outer surface of both ends of the upper side excluding the base, and a fitting part 20 for inserting the upper end of the leg is formed at a predetermined position on the inner wall thereof. After inserting the upper end of the leg into the fitting part 20 of the upper rung cap as shown in FIG. The upper treadle caps 3, 3' are fitted together by fitting between them, and then the legs 2, 2' and the upper treadle 3 are connected by rivets 21.
, 3' are connected and fixed.

The lower rungs 4 and 4' are connected to the upper rungs 3 as shown in Figures 3 and 4.
．． 3' is formed in exactly the same shape except that it has notches 22 for fitting inside the leg part at predetermined positions on both ends of the upper surface and is different in length.

That is, the lower treadles 4, 4' are attached to the bases 9, 10, which have the same structure as the upper treadles 3, 3'. Upper surface tread portion 11. A back surface portion 12 and a connecting portion 16 are provided, respectively.

Both ends of the lower treadle cap 8 are formed so as to be able to fit onto the upper side fitting portions of the lower treadles 4, 4', and the central portion continuing from both ends has a cross-sectional area larger than the notch 22. A concave fitting portion 25 is formed to be able to fit into the lower treadles 4, 4', and a lower treadle cap 8 is attached to the lower treadles 4, 4'.
After inserting it as shown in the arrow in Figure 5, attach it to the base 9, 1.
The legs 2 and 2' are passed through the grooves and the concave notches 22 and positioned at the dotted line positions, and the legs and the lower step are connected and fixed with rivets.

Reference numeral 6 designates an opening/closing fitting that connects the lower rungs 4, 4' so as to be openable and closable. Axis 30°30
One end is connected and fixed to each rotating shaft 30, 30 through the opening 15, and the other end is composed of an arm 32, 32 and a handle 33, each of which is rotatably pivoted to a handle support shaft 31, The stepladder can be opened and closed by operating the handle in the direction of the arrow.

Reference numeral 40 denotes a shoe made of soft synthetic resin that is removably fitted into the lower end of each leg, and at a predetermined position on the outside thereof, an engaging hole 41 formed in each leg 2, 2' is inserted when the shoe is in the state of the person wearing the shoe. An engaging protrusion 42 is formed, so that it can be easily fixed to the lower end of the leg without using any connecting means such as screws or rivets.

As mentioned above, this device has a pair of upper and lower treadles, each treadle cap, etc. made of the same extruded material, and a connecting part with a bearing part of the same structure on the back of each treadle. The upper and lower treadles are connected via a pair of rotary diagrams so that they can be opened and closed.
It can be mass-produced at an extremely low manufacturing cost, is easy to assemble, has a clean structure, and has many practical benefits such as easy opening and closing operations.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention, where A is a top view, the mouth is a side view, C is a front view, and Figure 2 is an enlarged view of the main parts of the present invention, where A is an upper treadle. 3 is an enlarged side view showing the connection structure between the lower step and the opening/closing fitting. 9 is a schematic perspective view illustrating the method of assembling the stepladder, FIG. 5 is a perspective view showing the structure for securing the lower end of the leg and the shoe, and 9 is a vertical sectional view. 1: Stepladder, 2.2': Legs, 3.3': Upper stepladder, 4.
4': Lower step, 5: Connecting rotating shaft, 6: Opening/closing fitting, 7:
Upper treadle cap, 8: Lower treadle cap, 13: Bearing portion, 30: Rotating shaft, 40 Ni.

Claims (1)

[Scope of utility model registration request] The pair of left and right legs are connected at predetermined positions facing each other at the upper end and the middle part, respectively, and have upper and lower rungs formed by extruded sections, and each rung has a tread section when the legs are opened. a connecting portion having an opening extending in the longitudinal direction at a predetermined position on the lower end side of the back surface, and a bearing portion communicating with the opening; The upper treadle passes through each of the openings, and its back surface is connected to each other so as to be openable and closable via a connecting rotating shaft whose both ends are inserted into each of the bearing parts, and the pair of lower treadles are connected to each bearing part, respectively. A stepladder characterized in that it is connected to an opening/closing fitting via a rotating shaft inserted therethrough.