WO2008052433A1

WO2008052433A1 - A connecting structure for ladders

Info

Publication number: WO2008052433A1
Application number: PCT/CN2007/003066
Authority: WO
Inventors: Zhengping Su
Original assignee: Zhengping Su
Priority date: 2006-10-31
Filing date: 2007-10-29
Publication date: 2008-05-08
Also published as: CN200975210Y

Abstract

A connecting structure for ladders, which is used to combine single ladders into a stepladder, comprises a connecting block (2) to be fixed on one single ladder (1) and a locking member (4) to be fixed on the other single ladder (3). The connecting block (2) and the locking member (4) are respectively provided with a protruding member (23) and a recess (24) which are pivoted together by a stairstepping hinge shaft (5), and a location pin (10) is set at the step (15) of the hinge shaft (5) for fixing.

Description

A ladder connection structure Technical field:

The utility model relates to a connection structure of a ladder, which is used for connecting two single ladders to an adult word ladder. Background technique:

The ladder is divided into a single ladder and a ladder. It is a common tool for construction and warehouse. When working on the side wall, the single ladder is convenient to use. When there is no side wall to lean on, the ladder is convenient to use. People often need to purchase two ladders at the same time to meet the requirements of use. Recently, a dual-purpose ladder has been developed for folding a single ladder as a ladder, but the length of the ladder cannot be too long for the rigidity of the single ladder, and its height is more restricted when used as a ladder. It is. If you can connect two single ladders together as a ladder, you can make full use of the cost, and the height of the ladder can be higher. Utility model content:

The purpose of the utility model is to provide a connection structure of a ladder, by which two single ladders can be connected into a ladder.

The connecting structure of the ladder of the utility model comprises a connecting block which can be fixed on a single ladder, and a locking block which can be fixed on the other single ladder, the connecting block has a convex key, and the locking block has a concave The table has a corresponding shaft hole on the concave table and the convex key. When the convex hole is inserted into the concave table, the two shaft holes are connected into a long hole, and the hinge shaft inserted in the long hole can move axially, and the hinge shaft has a step at one end, and the step is outward. The finite line pin of the hinge axis tangentially pinches the step on the hinge shaft to limit the axial movement of the hinge shaft.

When it is necessary to connect the two single ladders to the adult ladder, the convex key of the connecting block fixed on the two single ladders is inserted into the concave platform of the locking block, so that the corresponding shaft hole becomes a long hole, and the hinge shaft is pressed hard. In the long hole, the step surface on the hinge shaft moves into the shaft hole, inserts the limit pin, and blocks the step on the hinge shaft to prevent the axial movement of the hinge, and the hinge shaft fixes the locking block and the connecting block. Together, the connection function of the utility model is realized. When the ladder is to be disassembled into a single ladder, the limit pin is taken out, and then the hinge shaft is taken out, and the connecting block and the locking block can be separated to realize the disassembling function of the utility model. The utility model has the advantages of simple structure, convenient operation and stable and reliable connection.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 to 2 are schematic views of Embodiment 1 of the present invention;

Figure 3 is a schematic view of Embodiment 2 of the present invention

Figure 4 is a schematic view showing the locked state of Embodiment 3 of the present invention;

Figure 5 is a schematic view showing the released state of Embodiment 3 of the present invention;

Figure 6 is a schematic view of a hinge shaft of Embodiment 3 of the present invention; Figure 7 is a schematic view of a limit pin of Embodiment 3 of the present invention;

8 to FIG. 9 are schematic cross-sectional views showing the hinge shaft hole and the limit pin hole of the locking block of the embodiment 3 of the present invention; FIG. 10 is a partial schematic view showing the use state of the utility model connecting the two single ladders into a ladder. ;

Figure 11 is a schematic view showing the state of use of the two single ladders connected into a ladder. detailed description:

Example 1

As shown in FIG. 1, the connecting block 2 connected to the single ladder 1 has a convex key 23 with a shaft hole 6, and the locking block 4 connected to the single ladder 3 has a concave table 24 with a shaft hole 7, convex When the nut is inserted into the recess, the shaft hole 6 and the shaft hole 7 are connected into a long hole 16 in which the hinge shaft 5 can move axially. The hinge shaft 5 has a step 15 at one end and a stepped end of the hinge shaft 5. Looking outward, the limit pin 10 of the hinge axis 5 tangentially engages the step on the hinge shaft to limit the axial movement of the hinge shaft.

The two single ladders can be extension ladders. The telescopic ladder is a prior art, and the ladder frame is formed by a plurality of sleeves, and each layer has a corresponding spring pin and a pin hole between the sleeves, and the sleeve is pulled out to make the spring pin come to the adjacent sleeve. At the pin hole, the spring pin is ejected, which can be fixed, and the ladder frame is stretched; the operator presses the spring pin from the pin hole, and presses the corresponding sleeve into the adjacent sleeve to achieve the shrinkage. The telescopic function of the single ladder can be realized by multiple sleeves. The utility model can also be applied to the connection of two telescopic single ladders.

As shown in Fig. 2, the household jf is fixed at the end of the hinge shaft without a step, and the elastic member 8 is fixed to apply a force to the axial direction of the hinge; the elastic member 8 can be a spring, and one end of the elastic member 8 is placed at the end of the hinge shaft 5 without a step. On the 12th, the other end is placed on the latch 14 of the shaft hole 6. Since the spring 8 urges the hinge shaft 5 toward the step direction, and the step of the hinge shaft 5 faces outward, the hinge shaft keeps moving outward. After the limit pin 10 is pulled out, the hinge shaft can be ejected by itself, which is more convenient to operate.

Example 2

As shown in Fig. 3, there are two limit pins in the shaft hole, which can respectively clamp the steps of the hinge shaft to restrict the axial movement of the hinge shaft, one of which is away from the convex key, which is a fixed limit pin 17; the other is close to the convex The key is the activity limit pin 18. When the ladder is to be disassembled into a single ladder, the activity limit pin is pulled out, the hinge shaft is ejected, and the connecting block and the locking block can be separated, and the fixed limit pin can restrain the hinge shaft from coming out of the shaft hole. . The operation of the utility model is more convenient.

The rest is the same as in the first embodiment.

Example 3

As shown in FIG. 6, the step on the hinge shaft 5 includes two steps (a first step 21, a second step 22), and the smaller step of the step faces outward, as shown in FIG. 7: the limit pin 10 also includes a separable portion The two steps 19, 20 of the two steps are stuck. Refer to Figures 8 and 9 for the mounting position of the limit pin. The reference numeral 9 in the figure is the mounting hole of the limit pin. As shown in Figure 4: When two single ladders need to be connected to the adult ladder, the convex keys of the connecting blocks fixed on the two single ladders are inserted into the concave platform of the locking block, so that the corresponding shaft hole becomes a long hole. Pressing the hinge shaft into the long hole, and the step surface on the hinge shaft moves into the shaft hole. The limit pin is inserted, and the first step 19 catches the second step 22 on the hinge shaft to prevent the axial movement of the hinge. The hinge shaft fixes the locking block and the connecting block together to realize the connection function of the utility model. As shown in Fig. 5, when the ladder is to be disassembled, the limit pin is adjusted to make the hinge shaft pop out, and the second step 20 is stuck to the first step 22 of the hinge shaft, so that the connecting block and the locking can be The blocks are separated and the hinge axis does not come out.

The limit pin is provided with an elastic member 11 to bias the limit pin in the first step direction. In this way, when the hinge is axially pressed internally, since the first step 21 comes to the limit pin, the space increases here, and under the elastic force of the elastic member 11, the limit pin is ejected, and the second step 20 and the hinge are The first step 21 of the shaft 5 is in contact, and the hinge shaft is caught in the locked position. Pressing the limit pin forcefully, the first step 19 of the limit pin comes to the hinge shaft, where the space is increased. Under the elastic force of the elastic member 8, the hinge shaft 5 is ejected, and the second step of the hinge shaft 5 22 contact, the hinge shaft is stuck in the released position. The operation of the present invention is thus simpler.

The elastic member 11 may be a spring having one end mounted on the secondary step of the limit pin and one end of which is placed on the defining pin 13 in the pin hole.

The limit pin hole 9 is a stepped hole, which can limit the axial movement of the second step of the limit pin. In order to avoid the limit pin being ejected outside the hole.

Claims

Claim

A connecting structure for a ladder, comprising: a connecting block (2) fixed to a single ladder (1), and a locking block (4) fixed to the other single ladder (3) , the connecting block (2) has a convex key (23), the locking block has a concave table (24), the concave table (24) and the convex key (23) have corresponding shaft holes, and the convex (23) is inserted into the concave In the table (24), the two shaft holes are connected into a long hole (16), the hinge shaft (5) inserted in the long hole (16) is axially movable, and the hinge shaft (5) has a step (15) at the end, the step (15) Looking outward, the hinge shaft (5) tangential direction pin (10) catches the step (15) on the hinge shaft (5) to limit the axial movement of the hinge shaft.

2. The connection structure of a ladder according to claim 1, wherein: the two single ladders are extension ladders.

3. The ladder connection structure according to claim 1, wherein: the elastic member (8) is fixed at one end of the hinge shaft (5) without a step, and the axial direction of the hinge is biased.

4. The ladder connection structure according to claim 3, wherein: the elastic member (8) is a spring, and one end thereof is placed on the hinge shaft ( ₅₎ without a stepped end ( ₁₂₎ Upper, the other end is in the shaft hole

(6) on the card position (14).

5. A ladder connection structure according to claim 1 or 2 or 3 or 4, characterized in that the shaft hole (16) has two steps (15) which can catch the hinge shaft (5) to limit The hinge pin (5) axially moves the limit pin, one of which is away from the male key (23) and is a fixed limit pin (17); the other is close to the male key (15), which is an active limit pin (18).

6. A ladder connection structure according to claim 1 or 2 or 3 or 4, characterized in that the step on the hinge shaft (5) comprises two step steps (21), two steps (22) The smaller step (21) of the step faces outward, the length of the second step (22) is greater than the thickness of the convex key (23), and the limit pin (10) also includes two steps which can respectively clamp the two steps. Step (18), two steps (19).

7. A ladder connecting structure according to claim 6, characterized in that: the limiting pin (10) is provided with an elastic member (11) for biasing the limiting pin in the direction of the first step (18). '

8. The ladder connecting structure according to claim 7, wherein: the elastic member (11) is a spring, one end of which is placed on the second step (19) of the limiting pin, and one end is placed on the pin. On the limiting pin (13) in the hole.

9. The ladder connection structure according to claim 6, wherein: the hole (9) of the limiting pin is a stepped hole, and can limit the axial movement of the second step of the limiting pin.