JPH0656495U - Stepladder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a stepladder capable of standing the stepladder in a stable manner even if there is a difference in height on the standing surface of the standing step type stepladder. [Structure] In a stepladder a in which two legs 2 and 3 are hung vertically on the front side and right side of the top part 1 and one fulcrum 4 is hung on the opposite rear side, the fulcrum 4 is placed on an outer cylinder 5 and an inner cylinder 6 Is formed on the expandable / contractible support leg 4, a plurality of locking holes 7 are formed near the upper part of the vertically movable inner cylinder 6, and a bearing part 8 is attached near the lower part of the outer cylinder 5. A handle rod 10 is axially attached to a support shaft 9 erected on the bearing portion 8, and a lower portion of the handle rod 10 is provided with a locking rod 11 which is fitted in the locking hole 7 so as to project in the horizontal direction. The spring rod 12 is constantly interposed between the bearing portion 8 and the handle rod 10 so that the locking rod 11 can be pulled out from the locking hole 7 of the inner cylinder 6 against the spring rod 12 when gripped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a standing step type stepladder.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, the stance-type stepladder is unstable when the horizontal height of the erection surface on which the fulcrum is raised is different from the height of the shoe part of the leg, so the stepladder is tilted and unstable. A height adjustment block and wood pieces were laid on the shoe part of the body, and the top part of the stepladder was erected so that the top part of the stepladder was placed in a substantially horizontal state so that uniform load was applied to the legs and supporting legs. However, this work was inconvenient because it was difficult to find an adjustment piece with an appropriate height in the vicinity.

The present invention solves the above problems and provides a stepladder that can easily and stably stand in different heights.

[0004]

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

In a stepladder a in which two legs 2 and 3 are provided on the front left and right of the top part 1 and one support leg 4 is provided on the opposite rear side, the support leg 4 is attached to an outer cylinder 5 and an inner cylinder 6 Is formed on the expandable and retractable support leg 4, a plurality of locking holes 7 are formed near the upper part of the vertically movable inner cylinder 6, and a bearing portion 8 is provided near the lower part of the outer cylinder 5. The handle rod 10 is rotatably mounted on the support shaft 9 which is erected on the bearing portion 8, and the lock rod 11 which is fitted into the lock hole 7 is horizontally provided at the lower portion of the handle rod 10 so as to project in the horizontal direction. It is characterized in that the bearing rod 8 constantly presses the handle rod 10 against the bearing 8 so that the retaining rod 11 can be pulled out from the retaining hole 7 of the inner cylinder 6 against the protrusion 12 when grasped. It relates to the stepladder.

[0006]

[Operation] When the stepladder a is erected and the base of the handle rod 10 is grasped, the locking rod 11 is pulled out from the locking hole 7 of the inner cylinder 6 around the support shaft 9 installed on the bearing portion 8 as an axis. Adjust the top part 1 of the stepladder a standing up and down with respect to the outer cylinder 5 to be almost horizontal, and release the hand from the base of the handle bar 10 to release the locking rod 11 from the spring 12. The outer cylinder 5 and the inner cylinder 6 are locked by being inserted into the locking hole 7 of the inner cylinder 6 by the urging force, and the top portion 1 is held in a substantially horizontal state, so that the step a can be erected in a stable manner.

[0007]

【Example】

 The drawings show a preferred embodiment of the present invention.

Two legs 2 and 3 are provided vertically on the front, rear, left and right of the top part 1, and one support column 4 is provided on the opposite rear side.

The outer cylinder 5 on the upper part of the support column 4 is formed of a kamaboko-shaped hollow tube, and the inner tube 6 of the kamaboko-shaped hollow tube is inserted into the inner surface of the outer cylinder 5 to form the inner tube 6. The outer tube 5 is made non-rotatable so that the slide can be moved up and down. A plurality of locking holes 7 are formed near the upper part of the vertically movable inner cylinder 6, and an opening is formed near the lower part of the outer tube 5. A channel type bearing portion 8 having an opening on the outer cylinder 5 side is attached, and a support shaft 9 is provided slightly above the facing side plates 8 ', 8'of the bearing portion 8 and the handle rod 10 is provided on the support shaft 9 in the middle thereof. Is attached to the shaft, and a locking rod 11 that fits into the locking hole 7 is provided at the lower part of the handle rod 10 so as to project horizontally.

A bolt 13 is screwed on the bottom portion of the bottom plate 8 ″ of the bearing portion 8 so that its tip projects from the inner wall of the bottom plate 8 ″, and the inner diameter of the spring 12 is loosely fitted to the tip of the bolt 13. The front and rear end surfaces of the spring 12 are provided so as to contact the inner wall of the bottom plate 8 "and the handle rod 10 so that the locking rod 11 of the handle rod 10 always presses the inner cylinder 6.

Since the present invention is configured as described above, when the stepladder a is set up and the base of the handle rod 10 is gripped, the locking rod 11 comes out from the locking hole 7 of the inner cylinder 6, so that the inner cylinder 6 is removed from the outside. After adjusting the top part of the stepladder a which is vertically moved up and down with respect to the cylinder 5 to be substantially horizontal, the locking rod 11 is fitted into the locking hole 7 by the urging force of the spring 12 and the outer cylinder. 5 and the inner cylinder 6 are locked, and the stepladder a is erected in a stable manner.

When the handle rod 10 is gripped, the front portion of the handle rod 10 in the bearing portion 8 abuts on the tip of the bolt 13 and the tip of the locking rod 11 locks the locking hole 5 of the outer cylinder 5. 'Set the length of bolt 13 so that it will not come out more.

In addition, FIG. 4 shows that the support leg 4 is fixed to the engagement bottom plate 14 ′ of the channel-type engagement body 14 that is opened upward toward the upper part of the support leg 4 with the support leg 4 inserted therethrough. The mounting plates 15 'and 15' protruding from the base of the footrest body 15 are inserted inside the facing side plates 14 "and 14", and the mounting plates 15 'and 15' are locked to the locking body 14. The footrest body 15 is pivotally attached to the pivot shaft 16 erected on the front side of the opposite side plates 14 "and 14" so that the footrest body 15 can be vertically slidable with respect to the locking body 14, and the footrest pair 15 is attached to the support leg 4. It shows a stepladder a that is firmly and slidably provided.

Reference numeral 17 is an expansion preventing chain.

[0015]

[Effect of device]

 As described above, the present invention is a stepladder in which two legs are hung vertically on the front side and right side of the top part and one fulcrum is hung vertically on the opposite rear side. The inner cylinder that can be moved up and down has a plurality of locking holes formed near it, and a bearing is attached to the lower part of the outer cylinder.The handle rod is attached to the spindle installed on this bearing. When a handle rod is gripped, a lock rod is inserted from the lock hole of the inner cylinder when the handle rod is gripped. Since there is a spring that constantly presses the handle rod against the bearing so that it will come out against the support, even if the horizontal height at which the support leg is raised is different from the height of the shoe of the leg, the support leg is not supported. Stabilize the stepladder by sliding the inner tube of the sled up and down with respect to the outer tube to easily adjust the top of the stepladder to a substantially horizontal position. And can be erected in the figure becomes a practical and convenient stepladder.

[Brief description of drawings]

FIG. 1 is a perspective view of the present embodiment.

FIG. 2 is a side sectional view showing a main part of the present embodiment.

FIG. 3 is a plan sectional view of a main part of this embodiment.

FIG. 4 is a perspective view of a footrest according to the present embodiment.

[Explanation of symbols]

 1 Top 2, 3 Legs 4 Support leg 5 Outer cylinder 6 Inner cylinder 7 Locking hole 8 Bearing 9 Support shaft 10 Handle rod 11 Locking rod 12 Spring

Claims (1)

[Scope of utility model registration request] 1. Two legs are hung vertically on the left and right of the front of the top,
In a stepladder in which one support leg is hung vertically on the opposite rear side, the support leg is formed as an extendable and retractable support leg in which an inner cylinder is inserted into an outer cylinder, and a plurality of locking holes are provided near the upper part of the vertically movable inner cylinder. A bearing part is attached to the lower part of the outer cylinder, the handle rod is attached midway to the support shaft installed on this bearing part, and the locking rod that fits into the locking hole is attached to the lower part of the handle rod. There is a ridge that protrudes in the horizontal direction and constantly presses the handle rod against the bearing so that when the handle rod is gripped, the locking rod comes out from the locking hole of the inner cylinder against the ridge. A stepladder characterized by.