JP2545147Y2 - Telescopic strut fixing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for fixing a telescopic support such as a ladder by one-touch operation.

[0002]

2. Description of the Related Art Conventionally, as a ladder or the like for ascending to a high place and performing work or the like, for example, a ladder having a number of horizontal rods mounted between two long columns, or a ladder provided on the left and right. A stepladder or the like is generally known in which the ladder pieces are pivotally connected and placed on the ground in a substantially C shape for use.

Some ladders have a lower end portion of each column formed so as to be stretchable so that the ladder can be used even on a place with poor scaffolding such as a staircase or uneven ground.

In such a telescopic structure such as a ladder, for example, a telescopic strut is slidably attached to the lower end of a strut, and a plurality of communication holes are provided at a constant interval in each strut. The ladder strut and the telescopic strut are connected and fixed via pins, and the length is adjusted.

[0005]

However, the above-mentioned telescopic ladder and the like still have the following problems.

That is, when adjusting the length of a ladder or the like, a pin to which a support is fixed is once removed from a communication hole, the length of each support and the extension support is adjusted, and then the corresponding communication hole is re-inserted. Such an operation was very complicated because the operation had to be performed by inserting a pin.

[0007] Further, since the communication holes provided in the pillars are spaced at a fixed interval, the length of each pillar such as a ladder cannot be finely adjusted, and the communication holes formed on the ground or the like remain unstable. When placed, the ladder could fall over and cause an accident.

An object of the present invention is to provide a fixing device for a telescopic strut capable of solving the above-mentioned problems.

[0009]

According to the present invention, a telescopic strut is slidably fitted to a strut, and a rack shoe is disposed in a case formed in the strut, and the rack shoe is formed on the telescopic strut. Along with the rack surface, an operating rod is protruded from the rack shoe, and the operating rod is inserted into a long guide hole formed in the case. The knob is slidably mounted in the protruding direction, and is configured such that the base end of the knob can be fitted into the guide hole.

Furthermore, a lock plate is slidably interposed between the case and the base end of the knob along the case,
A guide communication hole through which the operating rod is inserted is formed in the lock plate, and a lock hole fitted into the guide communication hole is formed to have a larger diameter than the guide communication hole.

The operating rod is locked by fitting the base end of the knob into the fitting lock hole to prevent the rack shoe from sliding.

[0012]

[Effect of the Invention] In the present invention, a telescopic support is slidably and loosely fitted to a support, and a rack shoe is disposed in a case formed on the support. Along with the urging, an operating rod is protruded from the rack shoe, and the operating rod is inserted through a long guide hole formed in the case, and a knob is slid at the tip of the operating rod in the projecting direction of the operating rod. It is movably mounted, and the base end of the knob is configured to fit into the guide hole. Therefore, by releasing the fitting between the rack shoe of the column and the rack surface of the telescopic column, it can be expanded and contracted with respect to the column. The length can be easily adjusted by sliding the column.

Moreover, a lock plate is slidably interposed between the case and the base end of the knob along the case,
A guide communication hole through which the operation rod is inserted is formed in the lock plate, and a fitting lock hole is formed in the guide communication hole to have a larger diameter than the guide communication hole. By inserting the base end of the knob into the lock, the operating rod can be locked, the sliding of the rack shoe can be prevented, and the telescopic strut can be securely fixed to the strut.

Further, by lifting the knob and sliding the lock plate, the operating rod can be brought into the unlocked state, and the length of the column can be easily adjusted.

Further, the provision of the lock means for locking the operation of the operation section eliminates the possibility that the telescopic strut unexpectedly slides due to erroneous operation of the fixing device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 telescopic ladder including a telescopic column fixing device according to the present invention, and the ladder A is as follows. Is configured.

That is, the ladder A is provided on the right and left with the columns 1, 1
Are arranged at regular intervals, and a short step 2 is erected between the columns 1 and 1. Further, in the present embodiment, a joint fitting (not shown) that is rotatable in the middle of the columns 1, 1 is provided.
Is attached, and the columns 1 and 1 are formed to be bendable from the joint fitting, and are used as a stepladder having stability with respect to the ground or the like.

In the ladder A, as shown in FIG. 1, each of the columns 1, 1 is configured to be extendable and contractible, and the structure thereof will be described below in detail.

That is, in this embodiment, the column 1 is formed to have a substantially C-shaped cross section, the telescopic column 5 is nested in the column 1, and the telescopic column 5 is slid up and down. Further, a mounting table 6 for supporting the ladder A on the ground or the like is provided at the lower end of the telescopic strut 5.

Then, the ladder A is stabilized when the ladder A is placed on the stairs B as shown in FIG. .

In the present invention, as shown in FIG.
The fixing device 7 of the telescopic strut 5 is attached to the strut 1 of
The configuration of the fixing device 7 is configured as follows.

That is, the fixing device 7 has an uneven rack surface 8 formed on the inner surface of the telescopic strut 5, and a rack shoe 9 having an uneven engagement surface attached to each of the struts 1, 1. It is composed of Then, the rack shoe 9 of the column 1 is fitted to the rack surface 8 of the telescopic column 5 to fix the column 1 to the telescopic column 5.

In this embodiment, as shown in FIG. 2, a rack surface 8 is provided along the vertical direction of the telescopic strut 5,
A case 10 having a triangular shape in a side view is attached to the groove 1a of the column 1 formed in a C-shape and above the lowermost step 2. The rack surface of the telescopic column 5 is placed in a space 10a in the case 10. The rack shoe 9 engaging with the rack shoe 8 is housed.

The rear surface of the rack shoe 9 is tapered 9a.
The case 10 is provided with an inclined surface 10b as a guide portion for guiding the operation of bringing the rack shoe 9 into and out of contact with the rack surface 8 and moving the rack shoe 9 forward and backward along the inclined surface 10b. The engagement with the rack surface 8 and the release thereof are performed.

Further, a spring housed in a space 10a between the case 10 and the step bar 2 is provided under the rack shoe 9.
11, the spring 11 and the inclined surface 10b
This urges the rack shoe 9 in the direction of engaging with the rack surface 8. 9b indicates a mounting portion of the spring 11 provided on the lower surface of the rack shoe 9, and 2b indicates a mounting portion of the spring 11 provided on the step bar 2.

The rack shoe 9 has an operation section a for engaging and disengaging with the rack surface 8.
As shown in FIG. 3, a vertically long guide hole 12 is provided on the inclined surface 10b of the case 10, a fitting hole 12a is provided above the guide hole 12, and the rack shoe is inserted through the guide hole 12. The operation rod 13 projects from the tapered surface 9a of the
Is operated up and down to move the rack shoe 9.

A knob 15 is attached to the upper part of the operating rod 13 so as to be vertically movable.
The guide 14 is urged by the spring 14 so that the fitting projection 15a provided at the lower end of the knob 15 is fitted into the fitting hole 12a of the guide hole 12. Then, the rack shoe 9 is attached to the rack surface 8.
The operation rod 13 is locked in a state in which the operation rod 13 is fitted.

Moreover, the knob 15 is lifted upward,
The fitting rod 15 is removed from the fitting hole 12a of the guide hole 12 so that the operating rod 13 can be operated.

With the fixing device 7, the support 1 and the extendable support 5 are fixed, and each support 1 of the ladder A can be expanded and contracted.

The operation unit a of the fixing device 7 includes:
A lock plate 16 for easily locking and unlocking the operation unit a is attached, and the operation unit a is locked by the plate 16. The configuration of the lock plate 16 will be described in detail below. .

That is, a U-shaped lock plate 16 that slides along the inclined surface 10b of the case 10 is provided, and a central guide surface 16a of the plate 16 Hole 17 is provided and the guide communication hole
A large-diameter fitting lock hole 17a into which the fitting projection 15a of the knob 15 fits is provided below the 17. In addition, the guide projection hole 15a of the knob 15 engages with the guide communication hole 17, and
15 slides along the communication hole 17.

Then, as shown in FIGS. 2 and 3, the lock plate 16 is slid so that the fitting lock hole 17a of the guide communication hole 17 and the fitting hole 12a of the guide hole 12 are overlapped with each other. The fitting projection 15 of the knob 15 is inserted into the fitting hole 12a.
a is fitted, and the operation part a is locked to make the operation impossible.

On the other hand, as shown in FIGS.
The guide 15 is lifted upward, the lock plate 16 is slid downward, and the guide communication hole 17 and the fitting hole 12a of the guide hole 12 are overlapped with each other. 15a are engaged, and in this state, the operation part a is unlocked to be in an operable state, and the operating rod 13 is operated along the guide hole 12 and the guide communication hole 17, so that the rack shoe 9 and the rack surface 8 is released.

In this embodiment, the lock plate 16 of the fixing device 7 is arranged on the inclined surface 10b of the case 10, and the plate 16 is slid upward to lock the operating portion a and to hold the knob. 15 is lifted, the plate 16 is slid along the inclined surface 10b, and the operation part a is automatically unlocked, so that the operation can be easily performed.

Next, the operation of the ladder A provided with the fixing device 7 will be described in detail. As shown in FIG. 1, when the ladder A is placed on the stairs B, each of the struts 1, 1 of the ladder A, By sliding the telescopic strut 5 provided at the lower end, each strut 1, 1
Ladder A is stabilized by adjusting the length of the ladder A.

Further, the rack shoe 9 in the case 10 is moved by the urging of the spring 11 of the fixing device 7,
Then, the lock plate 16 of the case 10 is slid, and the fitting protrusion 15a of the knob 15 is fitted into the fitting lock hole 17a on the plate 16.

At this time, the fitting projection 15a of the knob 15 also fits into the fitting hole 12a on the case 10 and the operating part a is locked, so that the fixing device 7 is made inoperable. Work can be performed safely.

On the other hand, when the telescopic operation of each column 1 is performed,
When the knob 15 of the fixing device 7 is lifted upward, the fitting projection 15a is removed from the lock hole 17a of the lock plate 16,
Next, the plate 16 is slid along the inclined surface 10b of the case 10 so that the plate
Is engaged. In that state, the guide hole of case 10
By operating the knob 15 along the guide communication hole 17 of the plate 16 and the guide 16, the fitting between the rack shoe 9 and the rack surface 8 is released, and the columns 1 are expanded and contracted.

As described above, by sliding the lock plate 16, the operation portion a can be easily locked and unlocked, and the danger due to erroneous operation of the fixing device 7 can be eliminated.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a telescopic ladder including a telescopic strut fixing device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the telescopic strut fixing device.

FIG. 3 is an explanatory view showing a locked state of the fixing device.

FIG. 4 is an enlarged cross-sectional view showing a telescopic operation of the fixing device.

FIG. 5 is an explanatory diagram showing an unlocked state of the fixing device.

FIG. 6 is an enlarged cross-sectional view showing a telescopic operation of the fixing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 5 Telescopic column 7 Fixing device 8 Rack surface 9 Rack shoe 10 Case 10b Inclined surface 11 Spring 12 Guide hole 13 Operation rod 15 Knob 16 Lock plate 17 Guide communication hole a Operation part

Claims (1)

(57) [Scope of request for utility model registration] (1) A telescopic strut (5) is freely slidably supported on a strut (1).
And fit into the case (10) formed on the strut (1).
Rack shoe (9), and extend and retract the rack shoe (9).
While urging the rack surface (8) formed on the support (5),
An operating rod (13) is protruded from the rack shoe (9), and the operating rod (13) is
Into the elongated guide hole (12) drilled in the case (10).
The knob (15) at the tip of the operating rod (13).
(13) Install slidably in the protruding direction of (13).
Extension configured so that the portion can fit into the guide hole (12).
In the device for fixing the collapsible strut , the lock plate is placed between the case
(16) is slidably interposed along the case (10).
Guide plate through which the operating rod (13) is inserted
Drill a through hole (17) and fit it into the guide communication hole (17).
The inlet lock hole (17a) has a larger diameter than the guide communication hole (17).
And insert the base end of the knob (15) into the lock hole (17a).
To lock the operating rod (13)
A telescoping strut fixing device, characterized in that the shoe (9) is prevented from sliding .