JP2564331Y2 - Telescopic ladder 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 a telescopic ladder fixing device which can be locked and unlocked by one-touch operation.

[0002]

2. Description of the Related Art Conventionally, a ladder for climbing a high place to perform work or the like is, for example, one having a large number of steps installed between two long columns, or a ladder provided on the left and right. A common stepladder is formed by pivotally connecting pieces and placing the pieces on the ground in a substantially C shape. In addition, such a ladder is formed so that the lower ends of the struts can be extended and contracted so that it can be used even on a place with poor scaffolding, such as steps or uneven ground.

[0003] In such a telescopic structure of a ladder, for example, a telescopic strut is slidably attached to a lower end portion of a main strut, and a plurality of communication holes are provided at regular intervals in each main strut. Fix the telescopic strut to the main strut of the ladder via a pin,
The length is adjusted.

[0004] However, in the telescopic ladder having the fixing device as described above, when adjusting the length of the ladder, once the pin fixing the main strut and the telescopic strut is pulled out from the communication hole, and the telescopic ladder is stretched from the main strut. After the extraction and adjustment of the length of the column, a series of operations of inserting the pin again into the corresponding communication hole was performed, which was very complicated.

[0005] Further, since the communication holes provided in the main support are provided at regular intervals, the length of each support of the ladder cannot be finely adjusted, and the ground remains unstable. When placed on a ladder or the like, the ladder could fall and cause an accident.

[0006] Therefore, in order to solve such a problem, the present inventor has filed an application for an improved one-touch mountable telescopic ladder fixing device in Japanese Patent Application No. 3-99593.

That is, the improved fixing device is shown in FIG.
As shown in the figure, a telescopic strut 4 is attached to each of the main struts 1 of the ladder so as to be slidable in the vertical direction, and a rack 4a is formed on a side surface of the telescopic strut 4 that slides.
A rack shoe 8 that slides in the vertical direction is attached via a spring 21, and the telescopic strut 4 is fixed to the main strut 1 by fitting the rack shoe 8 with the rack 4 a. The conventional drawbacks have been solved by attaching the operation unit 20 for engaging and disengaging with the rack 4a.

[0008]

However, in such a fixing device capable of one-touch operation, since the operating part is disposed at the corner between the step of the ladder and the lower end of the main support of the ladder, The telescopic operation must be performed at the lower end of the main support while bending down, and it is difficult to perform the telescopic operation while checking the height of the ladder.

[0009] Therefore, it is necessary to repeat the operation of standing up and completing the extension / retraction operation, and then standing up to confirm the height, and if the height is not appropriate, crouching and adjusting again. Was complicated.

[0010] Further, since the operating portion projects at the corner between the step of the ladder and the lower end of the main support, it becomes an obstacle during work,
There was also a danger of tripping.

An object of the present invention is to provide a telescopic ladder fixing device which solves the above problems.

[0012]

According to the present invention, a telescopic strut is freely slidably fitted to a main strut arranged on the left and right sides of a ladder, a rack is formed on an inner surface of the telescopic strut, and an inner surface of the main strut is formed. An operation mechanism in which a shoe guide case is fixed and the rack shoe is housed in the shoe guide case so as to be able to move forward and backward in the direction of the rack on the inner surface of the telescopic strut. And the rack shoe is moved forward and backward, and the retractable ladder is fixed through a sliding operation between an inclined surface provided on the rack shoe and an operating surface abutting on the inclined surface. It concerns the device.

Further, in the present invention, in the above-mentioned fixing device, a case guide groove is formed on the side surface of the shoe guide case in the vertical direction, and the side wall of the rack shoe is fixed at a position substantially opposed to the case guide groove. An operating rod that forms an inclined sliding groove and also functions as an operating surface is loosely fitted in common to the case guide groove and the sliding groove as the inclined surface, and the operating mechanism is interlocked with the operating groove. And a fixing device for a telescopic ladder configured such that a rack shoe engages with and disengages from a rack of a telescopic strut via a sliding hole in response to the operation of an operating rod that moves up and down along a case guide groove by an operation mechanism. Things.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on an embodiment shown in the accompanying drawings.

The present invention relates to a device for fixing a telescopic ladder. The basic structure of the telescopic ladder is as shown in FIG. Then, a short stairway 2 is erected between the same support pillars 1 and 1 to form a ladder piece. The upper end of each of the two sets of ladder pieces is pivotally connected to each other by a fitting 3 so that the legs can be freely opened.

As shown in FIG. 3, the main struts 1 arranged on the left and right sides of the ladder are formed to have a substantially U-shaped cross section opened toward the inside, and the inside of the same main strut 1 is directed outward. The openable telescopic strut 4 is slidably fitted in the internal space of the main strut 1 so that the opening directions thereof face each other.

Further, as shown in FIG.
Are slidable up and down, and the telescopic strut 4 is extracted from the main strut 1 by a required length, and is fixed by the fixing device 6.
The fixing device 6 is operated by an operation mechanism 5 provided in the main support 1. At the lower end of the telescopic strut 4, a mounting table 4a for supporting the ladder A on the ground or the like is provided.

Then, from each of the front and rear parent struts 1, 1 and the telescopic strut,
By expanding and contracting 4,4 and adjusting its length,
As shown in (2), when the ladder A is placed on the stairs B, the ladder A is stabilized. In addition, since the length of each of the main columns 1 is adjustable, the main columns 1 can be stably mounted on a scaffold of any shape such as uneven ground.

In the above basic structure of the telescopic ladder A,
According to the present invention, as described below, a fixing device 6 is further provided inside the main support 1, and an operation mechanism 5 for operating the fixing device 6 is provided at a required portion of the main support to facilitate operation. Has features.

That is, as shown in FIG. 3, the main structure of the fixing device 6 includes a shoe guide case 7 fixedly formed on the inner side surface of the main support column 1 and a rack shoe 8 housed in its internal space. The shoe guide case 7 opens in the direction of the telescopic support column, and is formed of a substantially rectangular case formed in a cylindrical shape. A substantially square rack shoe 8 is provided in the internal space of the substantially square case. It is housed so that it can move forward and backward in the direction of the telescopic strut.

9 is a female screw hole for mounting formed in the upper and lower parts of the internal space of the shoe guide case 7;
10 is a shoe guide case 7 penetrating the side wall of the main support 1.
2 shows a fixing bolt screwed into the female screw hole 9 of FIG.

An engaging rack 11 is formed on the front end surface of the rack shoe 8, that is, on the side surface on the side of the telescopic strut. On both side surfaces of the shoe guide case 7, a case guide groove 12 is provided at a constant width in the longitudinal direction, and the rack shoe 8 is further provided with a sliding groove at a position substantially opposed to the case guide groove 12.
13 are drilled.

Further, a rod-shaped operating rod 14 is commonly inserted into the case guide groove 12 of the shoe guide case 7 and the sliding groove 13 of the rack shoe 8, and the operating rod 14 is When the rack shoe 8 moves up and down along the case guide groove 12 of 7, the rack shoe 8 slides in the shoe guide case 7 in the direction of the telescopic support column via the sliding groove 13 having a constant inclination.

At both ends of the operating rod 14, a bracket 15 is provided.
An operation lot 16 is connected to the bracket 15, and the other end of the operation lot 16 is bent at right angles to form a hand operation section 16a as shown in FIG. It extends to below bar 2.

Therefore, the hand operation section 16a can be arranged at a position separated from the fixing device 6 portion composed of the shoe guide case 7 and the rack shoe 8. Further, the middle of the operation lot 16 is held by guide brackets 17 continuously provided at several places on the inner side surface of the main support column 1, and the guide bracket 17 and the operating rod 14 provided at the lowermost end. The operating rod 14 is constantly urged to be positioned at the lower end of the groove 12 and the sliding groove 13 of the case guide by interposing a spring 18 between the bracket 15 and the bracket 15 provided continuously.

In the fixing device 6 for the telescopic ladder A thus configured, the inclination of the sliding groove 13 is such that the upper end of the sliding groove 13 is close to the engaging rack 11 and the lower end is separated from the engaging rack 11. The inclination is as follows.

Therefore, by pulling the operation section 16a at the upper end of the operation lot 16 upward from the state shown in FIG. 4, the operating rod 14 can be slid upward against the bias of the spring 18. For example, the operating rod 14 slides from the lower end to the upper end while contacting the case guide groove 12, and also slides from the lower end to the upper end while contacting the sliding groove 13 of the rack shoe 8. Since the sliding groove 13 has an inclination such that the upper end is close to the engaging rack 11 and the lower end is separated from the engaging rack 11,
Due to the contact between the operating rod 14 and the sliding groove 13, the rack shoe 8 moves in the direction of retreating from the rack 4a of the telescopic strut 4, and the engagement between the engaging rack 11 and the rack 4a as shown in FIG. Is released. The fixing operation of the fixing device 6 is released by the above operation.

On the other hand, if the bracket 15 and the operating rod 14 are moved downward as shown in FIG. 4 according to the bias of the spring 18, the rack 4a and the engaging rack 11 It becomes engaged and fixed by urging,
As shown in FIG. 4, the telescopic strut 4 extracted with respect to the main strut 1 is extracted and combined and fixed at the position.

As described above, the telescopic ladder A fixed by the fixing device 6 can securely fix the main support 1 and the telescopic support 4 and can freely fix the position.
The fixing and the release of the fixing can be easily performed by the operation mechanism 5.

Next, the operation of the telescopic ladder A having the fixing device 6 will be described in detail.
When the ladder A is placed on the stairs B as shown in FIG.
By sliding the telescopic strut 4 provided at the lower end of each main strut 1 to adjust the length of each strut 1 and stabilize the ladder A. Further, the rack shoe 8 in the shoe guide case 7 is fitted and fixed to the rack 4a of the telescopic support 4 by the urging of the spring 18 of the fixing device 6, and the ladder A
Do your work safely.

On the other hand, in the case of performing the expansion and contraction operation of each of the main columns 1, when the hand operation portion 16a which is a part of the operation mechanism 5 connected to the fixing device 6 is pulled upward, the engagement rack 11 and the rack 4a are pulled.
Is released, the telescopic strut 4 can be freely extracted from the main strut 1, and when the hand operation part 16 a is released at an appropriate position, the engaging rack 11 and the rack 4 a are biased by the spring 18. The engagement is fixed.

The telescopic operation as described above is performed by the operation unit 16a at hand.
However, since it can be set at a position away from the fixing device 6, it can be mounted at a position that is easy to operate.
It is possible to perform the expansion and contraction operation even when using.

Further, the fixing device 6 and the operating mechanism 5
Since it is stored compactly in the main support column 1, it is possible to eliminate the danger at the time of operation due to the fact that the fixing device and the operating mechanism 5 protrude outside the step bar 2 as in the related art. .

In the above-described embodiment, the rack shoe 8 in the fixing device 6 is moved forward and backward by forming a sliding groove 13 having a constant inclination on the side surface of the rack shoe 8. The operating rod 14 is loosely fitted in common with the case guide groove 12 provided on the side surface of the guide case 7 in the longitudinal direction, and the operating mechanism 5 is connected to the operating rod 14 in an interlocking manner. Although the operation is performed by vertically moving along the guide groove 12, the present invention is not limited to such a configuration, and the sliding operation between the inclined surface provided on the rack shoe 8 and the operating surface abutting on the inclined surface is performed. What is necessary is just to be comprised so that it may be performed.

[0035]

[Effects of the Invention] As described above, in the present invention,
When placing the ladder on stairs or uneven ground, slide the telescopic support provided at the lower end of each support of the ladder,
Adjust the length of each column, fit the rack shoe of the fixing device to the rack of the telescopic column, fix it,
By operating the operation lot of the operation mechanism, the fitting between the rack shoe of the main support and the rack of the telescopic support can be released, and the telescopic support can be slid up and down with respect to the main support.

Further, according to the fixing device of the present invention, it is possible to extract and adjust the length of each telescopic strut while confirming the height of the ladder by himself, and the operability is greatly improved.

Further, since the fixing device and the operating mechanism are housed inside the main support of the ladder, when the user works on the ladder like a conventional fixing device protruding from the step of the ladder, the operation is disturbed. The safety was improved without becoming.

[Brief description of the drawings]

FIG. 1 is an overall view of a telescopic ladder.

FIG. 2 is an explanatory view of use of a telescopic ladder.

FIG. 3 is an exploded perspective view of the telescopic ladder fixing device according to the present invention.

FIG. 4 is an enlarged explanatory view of a main part of a fixing device in which a part of the telescopic ladder according to the present invention is cut away.

FIG. 5 is a sectional view of the telescopic ladder fixing device according to the present invention.

FIG. 6 is an explanatory view of a conventional fixing device for a telescopic ladder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main support column 4 Telescopic support column 4a Rack 5 Operation mechanism 7 Shoe guide case 8 Rack shoe 12 Case guide groove 13 Sliding groove 14 Operating rod

Claims (2)

(57) [Scope of request for utility model registration] 1. A telescopic strut (4) is slidably and loosely fitted to a main strut (1) disposed on the left and right sides of a ladder, and a rack (4a) is formed on an inner side surface of the telescopic strut (4). Fix the shoe guide case (7) on the inner surface of the support (1), and
The rack shoe (8) is housed inside the telescopic strut (4) in the direction of the rack (4a) on the inner surface so that it can move forward and backward, and the movement of the rack shoe (8) is required by the main strut (1). The rack shoe (8) is moved forward and backward by sliding between an inclined surface provided on the rack shoe (8) and an operating surface in contact with the inclined surface. Telescopic ladder configured to be performed via a dynamic operation. 2. A telescopic strut (4) is slidably and loosely fitted to a main strut (1) disposed on the left and right sides of a ladder, and a rack (4a) is formed on an inner surface of the telescopic strut (4). Fix the shoe guide case (7) on the inner surface of the support (1), and
The rack shoe (8) is housed inside the telescopic support (4) in the direction of the rack (4a) on the inner surface so that it can freely move forward and backward, and the case guide is vertically arranged on the side of the shoe guide case (7). A groove (12) is formed, and a sliding groove (13) with a constant inclination is formed on the side wall of the rack shoe (8) at a position almost opposite to the case guide groove (12), and it also functions as an operating surface The operating rod (14) is loosely fitted in common to the case guide groove (12) and the sliding groove (13) as an inclined surface, and the operating mechanism (5) is interlocked with the operating rod (14). Then, according to the operation of the operating rod (14) which moves up and down along the case guide groove (12) by the operating mechanism (5), the rack shoe (8) is extended and retracted through the sliding groove (13).
A telescopic ladder configured to be disengaged from the rack (4a) of (4).