JPH0624560Y2 - Folding ladder joint - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a folding ladder, and more particularly to a joint used for the folding ladder.

[Conventional technology]

Traditionally, folding ladders are considered very convenient when stored, transported or used.

[Problems to be solved by the device]

However, when the folding ladder is unfolded, the operation procedure is very complicated, and the adjustment of the opening angle is extremely inconvenient, so improvement has been awaited.

The present invention has been made in view of the above problems of the prior art, and provides a joint for a folding ladder that has a very simple structure and can stably hold the ladder at various spread angles. The purpose is to do.

[Means for Solving the Problems]

According to the present invention, in order to solve the above-mentioned problems, according to the present invention, a first member and a second member axially attached to each other are provided. The second member has a main body made of a pair of parallel disks and a ladder leg connecting portion projecting to one side of the main body. , And the first member and the second member are
A folding ladder joint configured such that the first member is integrally attached to the second member so as to be integrally pivoted,
On each disc of the second member, a slide slot is opened in a portion close to the ladder leg connecting portion, and a pair of slide slots face each other, and their one side opposite hole edges. Each of them has a stepped portion; an arched sheet is fixed between one ends of the pair of slide slots, and the push rod is surrounded by the coil spring inside the sheet. It is elastically movable along its length; the front end of this push rod is provided with a projection on one side that allows it to be lightly engaged with the staircase, and on the other side with a projection. A lock member provided with a portion is provided; at the connecting portion between the main body of the second member and the ladder leg connecting portion thereof, the lock member is brought into contact with the lock member in the vicinity of the front portion to apply the elastic force of the coil spring. Against and backwards backwards Obtained before the edge portion, the inclined edge portion,
A trigger having a rear edge portion is pivotally mounted; when the folding ladder is held in a predetermined unfolded state, the locking member enters the notch and engages the notch. Due to this, the expanded state can be maintained, and when the expanded state is to be changed, the trigger is actuated so that the front edge portion, the inclined edge portion and the rear edge portion of the lock member project. The lock member is pushed out of the notched portion and the front end face to withdraw the lock member from the cut portion by retracting the lock member against the elastic force of the coil spring so that the protrusion thereof is lightly engaged with the step portion. The front end face allows the slide member to slide along the peripheral edge of the first member, and when the slid lock member reaches the next cut portion, the elastic force of the coil spring causes a light engagement at the stairs. Characterized in that the off and to allow engagement with 該切 write unit enters into 該切 write unit.

[Action]

When trying to change the unfolded angle of the folding ladder with the above structure, simply by actuating the trigger to rotate the legs of the ladder connected to the connecting portion, when the predetermined angle is reached, the locking member will It naturally engages the notch in the second member of the ladder to keep the ladder open.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the folding ladder joint according to the present invention mainly includes a first member 10, a second member 20,
It is composed of a trigger 30, an arched sheet 40, and a lock member 50. The first member 10 has a hollow disk-shaped main body, and a ladder leg connecting portion 11 is projectingly provided on one side of the main body, and a peripheral edge thereof with respect to the axial direction of the ladder leg connecting portion 11 is formed. There are three notches 13 that form an angle of 45 ° and are equally spaced (90 ° difference), and the shaft hole is in the center.
12 is open. The second member 20 has a main body made of a pair of parallel disk-shaped members, and a ladder leg connecting portion 21 is projectingly provided on one side of the main body and the ladder leg connecting portion 21. A slide slot 24 is formed in the place where and are integrally connected, and a shaft hole 22 is formed in the center of the body.
Is open. The trigger 30 is pivotally attached to one side of the second member 20 so as to be located between the ladder leg connection portions 11 and 12. Further, the arched sheet 40 is provided with the slide slot so as to be located inside the second member 20.
It is stuck to 24. The lock member 50 is located on the hole edge 26 side opposite to the hole edge 25 to which the arched sheet 40 is fixed, and is movably arranged inside the slide slot 24.

The first member 10 is fitted inside the second member 20, and the rivet is rotatably inserted and fixed in the shaft hole 12 of the first member 10 and the shaft hole 22 of the second member 20 so that the two members are integrated. It is pivoted.

The pair of parallel discs 23, 23 of the second member 20 have the same shape, that is, on the two discs 23, 23,
Slide slots 24, 24 facing each other are opened. The shape of each slide slot 24 is such that the arched sheet 40 can be secured by its pair of lugs 41, 41 to the hole edge 25 behind it and the locking member 50 can slide along the length of the slot. Has been formed.
The hole edge on one side in the length direction of each slide slot 24 is formed in the step portion 27, and the hole edge 26 is formed at the farthest position from the hole edge 25.
Has been formed.

As shown in the figure, the trigger 30 has a handle 31 and two parallel wings 32, 32. The trigger 30 is axially attached to the inside of the second member 20 by a shaft hole formed on each wing portion 32 and a rivet. In addition, each wing 32 is
It is formed in a substantially triangular shape, and a front edge portion 33, a rear edge portion 35, and an inclined edge portion 34 located between the pair of edge portions 33, 35 are formed in the front portion thereof. As will be described below, this trigger 30 can actuate the following locking member 50.

A through hole 42 is formed in the arch portion of the arched sheet 40, and a push rod 54 is provided in the through hole 42. The rear end of the push rod 54 is elastically held against the force of a coil spring 55 formed inside the arched sheet 40 so as to surround the push rod 54. Can be extended to the outside from the through hole 42. The head of the push rod 54 is fitted in a hole provided near the center of the rear surface 56 of the lock member 50.

The lock member 50 has a substantially rectangular parallelepiped shape, and the rear portion of the side surface corresponding to the step portion 27 is formed so that it can be lightly engaged with the step portions 27 and 27 (upper and lower), respectively. The protrusions 52, 52 are provided so as to project. The lock member 50
A protrusion 53 is formed on one side of the rear surface opposite to the protrusion 52. The protrusion 53 is affected by the rear edge portion 35 of the trigger 30 by operating the trigger 30.

In the state shown in FIG. 2, the ladder is completely folded and the front part of the locking member 50 enters into the notch 13a of the first member 10 and engages with it. In this state, the ladder leg connection parts 11 and 21 are parallel to each other.

When trying to change the included angle between the ladder leg connection portions 11 and 21 (the angle at which the ladder is spread), the edge portion 35 is rearwardly protruded by the protrusion of the lock member 50 by pulling the trigger 30 clockwise.
The lock member (50) is brought into contact with (53) and retracted against the elastic force of the coil spring (54). When retracted to a certain degree,
As the rear edge portion 35 and the protrusion 53 of the lock member 50 are no longer in contact with each other, the inclined edge portion 34 is then moved to the lock member.
Abut the front surface 51 of 50 to retract it further. When retracted to the abutment, the protrusion 52 of the lock member 50 resists the elastic force of the coil spring 55 and the slide slot 24.
Enter the last step of the staircase 27 and temporarily lightly engage with it (Fig. 3). In this state, when the ladder leg (not shown) connected to the ladder leg connection portion 21 of the second member 20 is rotated, the front surface 51 of the lock member 50 slides along the peripheral edge of the first member 10 and is cut off. When reaching the notch 13b, the protrusion 52 is separated from the engagement of the stepped portion 27, and the lock member 50 is moved to the notch 13b.
When it enters the inside and engages with the notch 13b, it simultaneously fits in the position of the hole edge 26 (FIG. 4).

From the state shown in FIG. 4, by operating the trigger 30 as described above and rotating the ladder leg connected to the ladder leg connection portion 21 of the second member 20, the lock member 50 is similarly moved to the cut portion 13c. By entering, it is possible to maintain the straight-line relationship between the ladder leg connection portions 21 and 11 (Fig. 5).

As shown in FIG. 6, when the lock member 50 is retracted to the abutment and the protrusion 52 thereof is lightly engaged with the step portion 27, the rear edge 35 of the trigger 30 is disengaged from the protrusion 53 (FIG. 6). (Two-dot chain line in). At this time, if the trigger 30 is pushed counterclockwise, the edge 35 can be moved back toward the front of the protrusion 53. Thereby, when the locking member 50 is sent to the next cut portion and engaged therewith, the jumping up of the trigger 30 caused by the lock member 50 momentarily engaging in the cut portion can be prevented. When the trigger jumps up, it often injures the user's hand.

As shown in FIGS. 7 and 8, the arched sheet 40
Is fixed to the rear hole edge 25 of the slide slot 24, and the lock member 50 is associated with the arched seat 40 via the coil spring 55 and the push rod 54. Lock member 50 is notched 13
The state of engagement with the lock member is shown in FIG.
The state in which 50 is not engaged with the notch 13 is shown in FIG.

[Effect of device]

As described above, according to the present invention, since it can be folded, it is convenient for storage and transportation, and when the ladder is unfolded, the operation operation is very simple, and the ladder can be surely opened at a predetermined angle. Since it can be held, it is extremely useful.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the structure of the present invention, FIG. 2 is an explanatory view showing a first operating state of the present invention, and FIG. 3 is an explanatory view showing a second operating state of the present invention. FIG. 4 is an explanatory view showing a third operation state of the present invention, FIG. 5 is an explanatory view showing a fourth operation state of the present invention, and FIG. 6 is a state in which the trigger of the present invention returns to its original position. FIG. 7 is a sectional view showing a state before the lock member of the present invention is engaged in the notch, and FIG. 8 is a sectional view after the lock member of the present invention is engaged in the notch. It is sectional drawing which shows a state. 10 ... First member, 11 ... Ladder leg connection part 12 ... Shaft hole, 13 ... Notch part 20 ... Second member, 21 ... Ladder leg connection part 22 ... Shaft hole, 23 ... Disc 24 ... Slide slot, 27 ... Step part 30 ... Trigger, 31 ... Handle part 32 ... Wing part, 33 ... Front edge part 34 ... Inclined edge part, 35 ... Rear edge part 40 ... Arched sheet, 42 ... Through hole 50 ... Lock member, 51 ... Lock member Front end face 52 ... Protrusion, 53 ... Projection 54 ... Push rod, 55 ... Coil spring

Claims (1)

[Scope of utility model registration request] 1. A first member and a second member axially mounted, the first member comprising: a hollow disk-shaped main body, a ladder leg connecting portion projecting from one side of the main body, and a plurality of portions provided on the peripheral portion of the main body. The second member has a main body made of a pair of parallel discs and a ladder leg connecting portion projecting from one side of the main body, and the first member and the second member. The member is a folding ladder joint configured so that the first member is integrally pivoted so as to be housed in the second member, and on each disk of the second member,
A slide slot is opened in a portion close to the ladder leg connection portion, respectively, and a pair of slide slots face each other, and a step portion is formed on each of the opposite hole edges on one side, An arched sheet is fixed between one ends of the pair of slide slots. Inside the sheet, a push rod is elastically movable in its length direction so as to be surrounded by a coil spring. At the front end of this push rod, there is provided a protrusion on one side so that it can be lightly engaged with the above-mentioned staircase, and on the other side, a lock member having a protrusion is arranged. ,
In the connecting portion of the main body of the second member and the ladder leg connecting portion thereof, a front edge portion which abuts on the lock member in the vicinity of the front portion and can retract the lock member backward against the elastic force of the coil spring, A trigger having an inclined edge portion and a rear edge portion is pivotally attached, and when the folding ladder is held in a predetermined unfolded state, the lock member enters into the notch portion and the notch portion. It is possible to hold the expanded state by being engaged, and when trying to change the expanded state, the trigger is actuated to move its front edge portion,
The inclined edge portion and the rear edge portion push the protrusion and the front end surface of the lock member to retract the lock member against the elastic force of the coil spring so that the protrusion lightly engages with the step portion. By allowing the lock member to escape from the cut portion and slide along the peripheral edge of the first member by the front end face thereof, when the slid lock member reaches the next cut portion, The collapsible ladder joint as described above, characterized in that the elastic force of the coil spring releases the light engagement at the stairs so that it can enter into the notch and engage with the notch.