JPH0522638Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a multi-stage folding step stool.

(Prior art) Conventionally, a multi-stage folding step stool is shown in Figs. 9 and 10.
As shown in the figure, a pair of left and right front columns 35 are arranged parallel to each other, a pair of left and right rear columns 36 are pivotally supported on the upper part of each front column 35, and a plurality of treads 3
7, and a link support 38 disposed in front of each front support 35. The rear portions on both sides of each treadle 37 are pivoted to the front strut 35 via a pivot shaft 39, and the intermediate portions on both sides are respectively pivoted to a link strut 38 via a pivot shaft 39. The pillars 38 constitute a parallel link mechanism.

Reference numeral 40 denotes a pair of left and right interlocking operating arms, the front end of which is pivotally connected to the link support 38 and the middle part to the front support 35, and a sliding body provided at the rear end is connected to the rear support 36. They are engaged in a relatively slidable manner in the longitudinal direction.

Therefore, the rotation operation about the pivot shaft 39 that pivots to both rear sides of the treadle 37 and the front and rear supports 35, 3 are performed.
The opening and closing operations of 6 can be operated in conjunction with each other, and the step stool has a usage position in which each step 37 protrudes forward when the lower side of the front and rear columns 35, 36 is opened, and the lower side of the front and rear columns 35, 36 is closed. At times, each treadle 37 is configured to be able to change its posture between a folded posture and a stowed state along the longitudinal direction of the front and rear supports 35, 36.

(Problem to be solved by the invention) According to the step stool of the above structure, the front and rear supports 35, 36
When the front and rear supports 35, 3 are in the open usage position,
6 from closing, there is a risk that the front and rear supports 35 and 36 may close unexpectedly, for example, if the rear support 36 leaves the ground when the user ascends or descends the step stool. It was very dangerous.

Further, in order to link the opening/closing operations of the front and rear columns 35, 36 and the rotating operation of the treadle 37, a pair of left and right interlocking operation arms 40 are required.

In view of the above-mentioned problems, it is an object of the present invention to provide a folding step stool that improves safety by preventing the front and rear supports from inadvertently closing during use, and reduces the number of parts.

(Means for solving the problems) The technical means taken by the present invention to achieve the above object are as follows.

A pair of left and right front columns 2 are pivotally connected to each other across the rear sides of both sides of the plurality of treadles 5, and a pair of left and right link columns 3 are arranged on the front side of each front column 2.
are pivotally connected across the middle portions of both sides of each treadle 5, and the upper portions of the pair of left and right rear columns 4 are connected to the upper side of the front column 2 so that the lower side can be opened and closed with respect to the front column 2. , when the front and rear columns 2, 4 are opened, each step 5 protrudes forward, and when the lower portions of the front and rear columns 2, 4 are closed, each step 5 is in the longitudinal direction of the front and rear columns 2, 4. In the folding step stool, which is in a folded position in a stowed state along A guide groove 13 provided along the longitudinal direction of the
The upper end portions of each rear strut 4 are pivotally connected to the front portions of both sides of the uppermost treadle 5, and can be released when the front and rear struts 2, 4 are in the open position. A locking means 20 that is engaged and restricts the closed state of the front and rear struts 2, 4 when engaged is attached to each of the struts 2, 4.
It is located at a point that spans three spaces.

(Function) According to the present invention, when the locking means 20 is brought into the engaged state in the usage position in which the lower end side of the front and rear columns 2, 4 is open and each treadle 5 protrudes forward, the front and rear columns 2, 4 are closed. Since the operation of the front and rear columns 2 and 4 is restricted, accidental closing of the front and rear columns 2 and 4 during use is prevented.

To put the front and rear struts 2, 4 in the folded position with their lower sides closed, the locking means 20 is released, and the treadle 5 is moved around the rear pivot parts on both sides that are pivotally supported by the front strut 2. Rotate upwards. With this rotational operation, each step 5 is placed into a storage shape along the longitudinal direction of the front support 2 by the parallel link mechanism of the step 5, the front support 2, and the link support 3. At this time, since the upper ends of each rear support 4 are pivotally connected to the front portions of both sides of the top step 5, the sliding body 10 moves along the guide groove 13 as the step 5 rotates. They slide relative to each other, and the lower sides of the front and rear columns 2 and 4 are closed.

(Example) Embodiments of the present invention will be described based on the drawings.

In Figs. 1 to 8, reference numeral 1 denotes a multi-stage folding step stool made of aluminum alloy, which includes a rectangular cylindrical front support 2, a link support 3, a rear support 4, each made of a pair of left and right extruded members, and a plurality of It is equipped with 5 steps.

Step end fittings 6 made of a hard synthetic resin material such as ABS are fitted to both ends of each step 5, and a non-slip rubber sheet (not shown) is fixed to the upper surface of the tread 5a of the step 5. has been done. The rear portions on both sides of each treadle 5 are pivotally connected to the front support 2 by a connector 8. Reference numeral 7 denotes an end fitting that is fitted and fixed to the upper end of the front support 2, and this end fitting 7 is pivotally connected to the uppermost treadle 5 by the connecting tool 8.

The link support 3 is disposed on the front side and parallel to the support support 2, and the intermediate portions of both sides of the step foot 5 are pivotally connected to the link support 3 by a pipe-shaped pivot fitting 9 that spans both sides of the step foot 5. has been done. the result,
The front strut 2, treadle 5, and link strut 3 constitute a parallel link mechanism.

Reference numeral 10 denotes a pair of left and right rectangular parallelepiped-shaped sliding bodies, which are pivotally connected to the upper outer side of each of the front columns 2 by stepped pins 11. Engagement recesses 12 are formed in the front and rear of the sliding body 10 in the vertical direction.

The rear strut 4 is arranged on the outside of each front strut 2,
A guide groove portion 13 is formed on the inner surface 4a side of the rear column 4 (front column 2 side) from the upper end to the middle part in the longitudinal direction. The engagement recess 12 of the sliding body 10 is slidably fitted along the guide groove 13. An end fitting 15 is fitted and fixed to the upper end of the rear column 4, and this end fitting 15 is pivotally connected to both front portions of the uppermost treadle 5 by means of connectors 17. 16 is a collar fitted onto the connector 17.

Therefore, the opening/closing operations of the front and rear columns 2, 4 and the rotating operations of each treadle 5 are linked, as shown in FIG.
When the front and rear struts 2, 4 are opened, the treadles 5 are in a usage position in which they mutually protrude forward parallel to the ground at the lower contact position of the link strut 3 with respect to the front strut 2. From this usage posture, each treadle 5 is rotated in the direction of arrow A by the parallel link mechanism of the treadle 5.
is stored along the longitudinal direction of the front column 2, and the link column 3 is in an upper contact position with respect to the front column 2. At this time, as the treadle 5 rotates, the sliding body 10 relatively slides along the guide groove 13,
The lower sides of the front and rear struts 2 and 4 are brought close together and finally the fifth
As shown in the figure, a folded position is obtained in which the front and rear struts 2 and 4 are overlapped inside and out, and the treadle 5 is stored along the longitudinal direction of the front and rear struts 2 and 4.

20 is a stopper (locking means) made of a substantially triangular plate-shaped metal material for releasably restricting the front and rear supports 2, 4 from closing in the usage position;
They are provided on the inner surfaces of the front struts 2 and link struts 3 on the left and right sides of the step stool 1. One end of this stopper 20 is pivotally connected to the link support 3 by a pin 21 via a washer 22 made of resin material. From the middle part of this stopper 20 to the other end, the sliding body 1
An elongated hole 23 is formed into which a stepped pin 11 that pivots 0 is slidably inserted. This elongated hole 23 consists of an arc-shaped lock guide portion 24 and a sliding permitting portion 24a, and an end of this lock guide portion 24 (one end of the elongated hole 23) is set at a lock position 24b.
Further, a knob piece 25 is formed inwardly at the lower part of the stopper 20.

For example, as shown in FIG. 1, in the operating position of the step stool 1, the stepped pin 11 is located at one end of the elongated hole 23, that is, at the lock position 24b of the lock guide portion 24.
is engaged with. In this engaged state, the distance between the stepped pin 11 and the pin 21 is maintained constant, so that the link strut 3 is prevented from separating from the front strut 2 while the link strut 3 is in contact with the front strut 2. , rotation of the treadle 5 is restricted. Therefore, the front and rear struts 2,
4 is prevented from closing.

When folding, rotate the stopper 20 around the pin 21 to move the stepped pin 11 to the lock position 24b.
to separate from Thereafter, when the treadle 5 is rotated, the front and rear struts 2 and 4 are placed in a folded position. At this time, the stepped pin 11 relatively slides along the elongated hole 23, and finally, as shown in FIG.
Located in

When changing the posture from the folded posture to the use posture, the stepped pin 11 is allowed to slide freely within the elongated hole 23, and the front and rear struts 2, 4 can be opened independently of the stopper 20.

In addition, 27 is a cap made of synthetic resin, and 28 is a reinforcing plate that is installed between the rear columns 4 and comes into contact with the front columns 2 in the folded position.

Note that the present invention is not limited to this embodiment, and in this embodiment, the stopper 20 (locking means) is
Although an example of a structure in which the structure is provided between the link column 3 and the link column 3 is illustrated, it may be provided between the front column 2 and the rear column 4 or between the link column 3 and the rear column 4. Further, the stoppers 20 may be provided on both the left and right sides of the step stool 1.

(Effect of the invention) The present invention allows the front and rear supports 2 and 4 of the folding step stool 1 to be releasably engaged in the open usage position, and also to prevent the front and rear supports 2 and 4 from closing when engaged. Since the locking means 20 is provided between each strut 2, 3, the front and rear struts 2, 4 will not be closed accidentally during use, improving safety.

Further, a sliding body 10 pivotally connected to one side of the upper part of each front column 2 is relatively slidably engaged with a guide groove 13 provided in the longitudinal direction on a side surface of the rear column 4 corresponding to the front column 2. Since the upper end of each rear column 4 is pivotally connected to the front portions of both sides of the top step 5, the front and rear columns 4 do not need to be provided with a pair of interlocking operating arms on the left and right sides of the step 1 as in the past. The opening/closing operations of 3 and 4 and the rotating operation of the treadle 5 can be performed in conjunction with each other, and the number of parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the main part showing an embodiment of the present invention;
Figure 2 is a side view of the whole in the same usage position, Figure 3 is a front view of the same, Figure 4 is an enlarged view of the main parts, Figure 5 is a side view of the whole in the same folded position, and Figure 6 is the front view of the same. Figure 7 is a rear view of the figure, Figure 8 is a view taken along arrow B in Figure 1, Figure 9 is an overall side view of the conventional example in the usage position, and Figure 10 is the same folded FIG. 3 is an overall side view of the posture. 2...Front column, 3...Link column, 4...Rear column, 5...Stepper, 10...Sliding body, 13...Guide groove, 20...Lock means (stopper).

Claims (1)

[Claims for Utility Model Registration] A pair of left and right front columns 2 are pivotally connected to each other across the rear sides of both sides of a plurality of treadles 5, and a pair of left and right link columns are arranged on the front side of each front column 2. 3
are pivotally connected across the middle portions of both sides of each treadle 5, and the upper portions of the pair of left and right rear columns 4 are connected to the upper side of the front column 2 so that the lower side can be opened and closed with respect to the front column 2. , when the front and rear columns 2, 4 are opened, each step 5 protrudes forward, and when the lower portions of the front and rear columns 2, 4 are closed, each step 5 is in the longitudinal direction of the front and rear columns 2, 4. In the folding step stool, which is in a folded position in a stowed state along A guide groove 13 provided along the longitudinal direction of the
The upper ends of each rear strut 4 are pivotally connected to the front portions of both sides of the uppermost step 5, and can be released when the front and rear struts 2 and 4 are in the open position. A locking means 20 that is engaged and restricts the closing operation of the front and rear struts 2, 4 when engaged is attached to each of the struts 2, 4.
A folding step stool that is characterized by being installed over three rooms.