WO2011113183A1

WO2011113183A1 - Connecting sleeve for extension ladder

Info

Publication number: WO2011113183A1
Application number: PCT/CN2010/000909
Authority: WO
Inventors: 王万兴
Original assignee: 宁波兴富工具有限公司
Priority date: 2010-03-17
Filing date: 2010-06-22
Publication date: 2011-09-22
Also published as: EP2549054A1; CN101798902A; EP2549054B1; CN101798902B; EP2549054A4

Abstract

A connecting sleeve for an extension ladder is provided, which includes a connecting ring (1) and a connecting block (2). A rotary seat (3) and a rotary panel (4) are set on the joint surface between the connecting block (2) and the connecting ring (1). The rotary seat (3) is fixed relative to the connecting ring (1), and a socket (31) is set in the centre of the rotary seat (3). A rotating shaft (32) extends to the centre of the socket (31) from two sides of the socket (31) respectively, and a vertical part (41) of the rotary panel (4) is inserted into the socket (31); furthermore, a torque spring (5) is installed outside the rotating shaft (32) so that the horizontal part (42) of the rotary panel (4) can be rotated towards the connecting block (2) about the rotating shaft. When the extension ladder is folded, a fixed safe space between the rungs of the ladder is provided by the rotary panels (4) for preventing fingers from being clamped, meanwhile, the integral height of the ladder can be reduced so as to facilitate package and transportation of the ladder when the horizontal part (42) of the rotary panel (4) is folded.

Description

Connecting sleeve for extension ladder

Technical field

The invention relates to the technical field of an extension ladder, and in particular to a connection sleeve for an extension ladder. Background technique

Ladders have been used extensively in the construction, renovation, advertising, and home residential sectors. At present, the most popular on the market is a telescopic ladder that can be stretched up and down. When it is not in use, it can be shortened and easily stored and transported. For example, the prior patent "A Retractable Ladder" of the patent number ZL200420091638.2 (publication number CN2716479Y) discloses such an extension ladder, which comprises a crossbar and a vertical rod, and the vertical rod is a number of sleeves. Telescopically sleeved, a plurality of crossbars are disposed between the opposite two vertical rods, and retractable axle pins are respectively disposed at two ends of each crossbar, and the axle pins are respectively opened in the sleeve The corresponding positioning jacks are adapted to have an annular connecting sleeve at the upper end of each of the sleeves, and the connecting sleeve is connected with the cross bar. When the telescopic ladder is in use, there is no fixed gap between the upper and lower rails, and the user's hands are generally supported on a crossbar. When the telescopic ladder is closed, the upper crossbar is pressed to rest below. The fingers on the crossbar have hidden dangers. Summary of the invention

The technical problem to be solved by the present invention is to provide a connecting sleeve for an extension ladder for the current state of the art, which has a fixed spacing between the upper and lower rails, and effectively prevents the crossbar from being pressed to the fingers when the telescopic ladder is closed. And when the product is packaged and transported, the overall height is not too high, which is very suitable for practical use.

The technical solution adopted by the present invention to solve the above technical problem is that the connecting sleeve for the extension ladder comprises a connecting ring and a connecting block which are integrally connected, and is characterized in that: on the surface of the joint between the connecting ring and the connecting block Providing a rotating seat and a rotating plate;

Wherein, the rotating seat is fixed with respect to the connecting ring, the center of the rotating seat is provided with a socket, and the two sides of the socket respectively extend to the center to have a rotating shaft;

The rotating plate is substantially T-shaped, the vertical portion thereof is inserted into the socket of the rotating seat, the lateral portion thereof is located above the rotating seat, and the two rotating shafts on the rotating seat are laterally inserted into the shaft hole of the vertical portion;

Moreover, a torsion spring is disposed in the shaft hole of the vertical portion of the rotating plate and outside the rotating shaft, and one end of the torsion spring is connected to the inner side of the shaft hole of the rotating plate, and the other end is connected with the rotating seat, so that the lateral portion of the rotating plate can Rotating in the direction of the connecting block centering on the rotating shaft and always having a tendency to rise above the rotating seat.

The connecting ring is sleeved outside the sleeve of the corresponding vertical rod and connected to the vertical rod, and the end of the connecting block is inserted into the cross rod

- 1 a confirmation And connected to the crossbar.

In order to further ensure that the setting of the swivel and the rotating plate can effectively protect the hands of the user, the height of the rotating plate is greater than the thickness of the finger.

In order to facilitate assembly of the components, the swivel can be formed by splicing the left and right transfer seats, and the bottom of the transfer seat is inserted through the protrusions to the joint between the connection ring and the connection block.

As a further improvement, the lateral portion of the rotating plate may have a trapezoidal shape, such that the top portion of the lateral portion has a horizontal surface to facilitate the abutment of the bottom of the upper crossbar, and the thickness of the rotating plate is adapted to the thickness of the rotating seat, so that the rotating plate When erected, it is integral with the rotating seat, and the surface is neat. After the lateral portion of the rotating plate is folded over the side of the rotating seat, the surface of the rotating plate is substantially flush with the top surface of the rotating seat. In order to ensure that the rotating plate can protect the finger when it is erected, the overall height of the rotating plate is preferably 2 cm or more. Compared with the prior art, the invention has the advantages that: by the rotation of the rotating seat, the rotating plate and the torsion spring therebetween, the lateral portion of the rotating plate can be centered on the rotating shaft, and the rotating seat and the connecting sleeve itself rotate. When the extension ladder is in normal use, since the rotating plate always stands up relative to the rotating seat, the upper and lower horizontal bars are separated by the rotating plate, and the spacing can accommodate the fingers, effectively preventing the extension ladder from being folded, the upper horizontal The rod is pressed to the finger on the lower crossbar, and when the telescopic ladder package is transported, the lateral portion of the rotating plate can be folded down on one side of the rotating seat, so that there is only the height of the rotating seat between the upper and lower crossbars. The spacing, when the product is packaged and transported, the overall height is not too high, which is very suitable for practical use. DRAWINGS

1 is a schematic structural view of an embodiment of the present invention;

2 is a schematic structural view of a rotating plate in a folded state according to an embodiment of the present invention;

Figure 3 is an exploded perspective view of an embodiment of the present invention. detailed description

The invention will be further described in detail below with reference to the embodiments of the drawings.

The extension ladder to which the embodiment of the invention is applied includes two opposite vertical rods and a plurality of cross bars fixed between the two vertical rods, and the vertical rod comprises two telescopic inner and outer sleeves sleeved, A cross bar is fixed between the two opposite sleeves of the same section, and the two ends of each crossbar are relatively fixed by the connecting sleeve of the embodiment of the invention and the sleeve of the corresponding vertical rod;

As shown in FIG. 1, FIG. 2 and FIG. 3, the connecting sleeve for the extension ladder comprises an integral connecting ring 1 and a connecting block 2, which are arranged on the surface of the joint between the connecting ring 1 and the connecting block 2. a rotating seat 3 and a rotating plate 4;

Wherein, the connecting ring 1 is sleeved and fixed with the corresponding vertical rod, and the connecting block 2 is inserted into the end of the corresponding cross bar; The rotating base 3 is formed by splicing the left and right two rotating seats 3a, and the rotating base 3a is inserted into the side of the connecting ring 1 through the bottom protruding post 33, so as to be fixed relative to the connecting ring 1, and the socket 3 has a socket in the center. 31, and the two sides of the socket 31 respectively extend toward the center with a rotating shaft 32;

The rotating plate 4 is substantially T-shaped and has an overall height of 3 cm. The vertical portion 41 is inserted into the socket 31 of the swivel 3, and the lateral portion 42 is trapezoidal and located above the rotating base 3, and the thickness of the rotating plate 4 is It is basically the same thickness as the transposition 3; ■

The two rotary shafts 32 on the rotary base 3 are laterally inserted into the shaft holes 41a of the vertical portion 41, so that the lateral portion 42 of the rotary plate 4 can be rotated about the rotary shaft 32, and the lateral portion 42 of the rotary plate 4 is rotated. To the side of the transposition 2, that is, to the opposite connection block 2;

Further, a torsion spring 5 is disposed in the shaft hole 41a of the vertical portion 41 of the rotating plate 4 and outside the rotating shaft 32. One end 51 of the torsion spring 5 is connected to the inner side of the shaft hole 41a of the rotating plate 4, and the other end 52 and the rotating seat are provided. 3 is connected, so that the lateral portion 41 of the rotating plate 4 can be rotated in the direction of the connecting block 2 around the rotating shaft 32 and always has a tendency to rise above the rotating base 3, that is, in the case where no external force is applied, the rotating plate The lateral portion 41 of the 4 is always facing upward, and in practice, the upper and lower rails of the extension ladder are separated from the entire rotating plate 4 and the rotating base 3, and only the lateral portion 41 of the rotating plate 4 can be applied with an external force. Folded toward the connecting block 2 so that the upper and lower rails are separated from each other only by the swivel 3.

Claims

Rights request

A connecting sleeve for an extension ladder, comprising an integral connecting ring (1) and a connecting block (2), characterized in that: a joint between the connecting ring (1) and the connecting block (2) a rotating seat (3) and a rotating plate (4) are disposed on the surface;

Wherein, the rotary seat (3) is fixed relative to the connecting ring (1), the socket (3) has a socket (31) in the center, and the two sides of the socket (31) respectively extend to the center with a rotating shaft (32;) ;

The rotating plate (4) is substantially T-shaped, the vertical portion (41) is inserted into the socket (31) of the rotary seat (3), and the lateral portion (42) is located above the rotary seat (3), and is rotated Two rotating shafts (32) on the seat (3) are laterally inserted into the shaft holes (41a) of the vertical portion (41);

And a torsion spring (5) is disposed outside the shaft hole (41a) of the vertical portion (41) of the rotating plate (4), and the rotating shaft (5) is opposite to the rotating shaft (5). (4) The shaft hole (41a) is connected inside, and the other end (52) is connected to the rotating seat (3), so that the lateral portion (41) of the rotating plate (4) can be oriented toward the connecting block (2) with the rotating shaft as the center. Rotate and always have a tendency to rise above the swivel (3).

2. The connecting sleeve for an extension ladder according to claim 1, wherein: the rotating seat (3) is formed by splicing the left and right two rotating seats (3a), and the rotating seat (3a) passes through the bottom. The studs (33) are inserted into the joint between the connecting ring (1) and the connecting block (2).

3. Connecting sleeve for an extension ladder according to claim 1 or 2, characterized in that the thickness of the rotating plate (4) is adapted to the thickness of the swivel (3).

The connecting sleeve for an extension ladder according to claim 1 or 2, characterized in that: the overall height of the rotating plate (4) is greater than or equal to 2 CM.