KR19990016744A - Folding Ladder Hinge - Google Patents

Abstract

The present invention relates to a hinge for a folding ladder for folding and folding the folding ladder at a predetermined angle. According to the present invention, the center pin 41 is moved to the free portion 21b of the second hinge plate 20 by holding the post connecting portions 10b and 20b with both hands, and the post connecting portions 10b and 20b are opened. The first hinge plate 10 and the second hinge plate 20 at the same time as the second connecting pins 42 and 43 move along the guide holes 12 and 31 of the first hinge plate 10 and the clamping plate 30. The rotating parts 10a and 20a of the rotating parts are rotated in opposite directions, and the first and second connecting pins 42 and 43 are formed in the guide holes 12 and 31 of the first hinge plate 10 and the lock chain 30. The center pin 41 is positioned in the locking portions 12b and 31b, respectively, and is fixed in a state of being opened at 30 degrees or 180 degrees by being positioned at the fixing portion 21b of the second hinge plate 20. Thus, the folding ladder hinge according to the present invention has the advantage that the structure is very simple, and can be folded and folded in a single operation, very convenient to use.

Description

Folding Ladder Hinge

The present invention relates to a hinge for a folding ladder for folding and folding the folding ladder at a predetermined angle, and in particular, a folding ladder hinge that is easy to use because it can be folded and folded in a single operation while having a very simple structure. It is about.

In general, the folding ladder is used to expand the 'A' form or '-' form according to the purpose to use, by adjusting the rotation angle of the hinge. Various types of hinges are now well known for adjusting the deployment angle of such folding ladders. For example, Korea Utility Model Publication No. 9124, 1991. The hinge for a folding ladder disclosed in Republic of Korea Utility Model Publication No. 9124 in 1991 is shown as an exploded perspective view in FIG. Referring to Figure 5 briefly described the structure of a hinge for a conventional folding ladder as follows.

As shown, the inner disc 1 and the outer disc 2 and 2 'having the strut connection portions 1a and 2a connected to the ladder are each formed with central holes 1b and 2b at the center thereof. It is coupled by a bushing 3 through the balls 1b and 2b. The outer discs 2 and 2 'have a pair of through holes 2c symmetrical with respect to the center hole 2b, and the inner disc 1 has three pairs of through holes symmetrical with respect to the center hole 1b. Has a ball 1c. The bushing 3 has a center pin 5 provided with a spring 4 therethrough, and a fixture 6 is provided at one side of the center pin 5. Both ends of the spring 4 are fixed to the handle 5a and the outer disc 2 'of the center pin 5, respectively. In addition, fixing pins 6a inserted into the through holes of the disc 2 are attached to both sides of the fastener 5. A locking groove 6b is formed at the end of the fixing pin 6a.

In this way, by pressing the handle (5a) of the center pin (5) so that the locking groove (6b) of the fixing pin (6a) is caught on one side of the through hole (2c) of the outer disc (2), holding with both hands Holding the connecting portions 1a and 2a apart, the fixing pin 6a is positioned at the position where the through holes 2c of the outer discs 2 and 2 'coincide with one of the three pairs of through holes 1c of the inner disc 1. ) Is inserted into the through holes 1c and 2c of the outer discs 2 and 2 'and the inner disc 1 so that the ladder is fixed while maintaining the open angle.

However, the conventional folding ladder hinge has the following disadvantages. That is, in order to develop the ladder, first, the external disk must be grasped by one hand, and the handle of the center pin must be pressed by the other hand. In other words, it is necessary to remove the fixing pin from the through hole of the inner disc. Then hold the props of the ladder with both hands and deploy the ladder. Therefore, there is a disadvantage in that it is inconvenient to use because it undergoes two steps of operation when the ladder is deployed. In addition, the number of components has a disadvantage of complicated structure and high manufacturing cost.

The present invention has been made to solve the disadvantages of the conventional hinges for ladders, and has a very simple structure and can be used to unfold the ladder in a single operation to provide a folding ladder hinge easy to use its purpose There is this.

1 is an exploded perspective view of a hinge for a folding ladder according to the present invention,

Figure 2 is an assembled state of the hinge hinge for folding according to the present invention,

3 and 4 shows an example of the use of the present invention,

Figure 3 shows the state stretched to 30 degrees,

Figure 4 shows the expanded state 180 degrees. And,

5 is an exploded perspective view showing an example of a conventional folding ladder.

* Explanation of symbols for the main parts of the drawings

DESCRIPTION OF SYMBOLS 10 1st hinge board, 10a: rotation part, 10b: strut connection part, 11: center ball, 12: guide ball, 12a: guide part, 12b: locking part, 13: rivet ball, 20: 2nd hinge board, 20a: Rotating part, 20b: Shoring connection part, 21: center hole, 21a: fixing part, 21b: free part, 22: fixing hole, 23: rivet ball, 30: clasp, 31: guide ball, 31a: guide part, 31b: locking part 32: fixing hole, 41: center hole, 42: first connecting pin, 43: second connecting pin, 44: rivet

In order to achieve the above object, it is composed of a strut connecting portion connected to the strut of one side ladder, and a rotating portion having a rhombus-shaped center hole, the strut connecting portion is formed at a right angle in the longitudinal direction of the guide portion and the upper end of the guide portion The first hinge plate having a guide hole consisting of a locking portion extended to the support, a support connecting portion connected to the support of the other ladder, and the rotating portion, the rotating portion is a rhombic fixing portion corresponding to the center hole of the first hinge plate And a circular free portion formed on an upper portion of the fixing portion, wherein the support connecting portion penetrates through a second hole of the second hinge plate having a fixing hole on one side thereof, and a center hole of the first hinge plate and the second hinge plate. A center pin for hinge connecting the first hinge plate and the second hinge plate, and the rotation angle of the first hinge plate and the second hinge plate, restricting the rotation angle, A guide hole formed of a guide portion elongated in a direction and a locking portion extending at right angles from an inner end of the guide portion, and a lock portion having a circular fixing hole formed at the other end thereof, and fixing the guide hole and the clamping portion of the first hinge plate. The present invention includes first and second connecting pins connecting the first hinge plate and the clasp through the ball, and connecting the second hinge plate and the clasp through the fixing hole of the second hinge plate and the guide hole of the clasp. According to this there is provided a hinge for a folding ladder.

The hinge for folding ladder according to the present invention as described above, the first and second connection pins of the first hinge plate and the clamp when the center pin is moved to the free portion of the second hinge plate while holding the support connecting portion with both hands, and the support connecting portion is opened. The rotary parts of the first hinge plate and the second hinge plate are rotated in opposite directions simultaneously with the movement along the guide ball, and the first and the second connecting pins are respectively located in the locking part formed in the guide hole of the first hinge plate and the catch. The center pin is fixed in a state of being opened at 30 degrees or 180 degrees by being located at the fixing portion of the second hinge plate. The hinge for the folding ladder according to the present invention has the advantage that the structure is simple, very easy to use because the ladder can be unfolded in a single operation.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 a hinge for a folding ladder according to the invention is shown. Figure 1 is an exploded perspective view showing the configuration of the present embodiment, Figure 2 is an assembled state diagram showing the present embodiment assembled, Figures 3 and 4 are 30 degrees ('A' shape) and 180 degrees ('-', respectively) It is a use state diagram of the present Example which showed the expanded state.

First, the hinge for folding ladder according to the present invention is the first hinge plate 10, the second hinge plate 20, the clamp 30, and the first hinge plate 10 and the second hinge plate 20 And a center pin 31 and a pair of connecting pins 42 and 43 for coupling the lock 30 with each other.

The first hinge plate 10 is composed of a rotating portion 10a and a strut connection portion 10b. The center hole 11 of the rhombus shape is formed in the middle one side of the rotating part 10a. The strut connection portion 10b is connected to a strut (not shown) of the ladder by riveting as a rectangular plate. And the guide hole 12 is formed in this strut connection part 10b. The guide hole 12 extends perpendicularly from the upper end of the guide portion 12a to the right side, that is, outward from the upper end of the guide portion 12a, which is formed vertically from the lower one side of the support connecting portion 10b to the upper side. It is made of a locking portion 12b formed.

Like the first hinge plate 10, the second hinge plate 20 includes a rotating part 20a and a support connecting part 20b. The rotating part 20a of the 2nd hinge board 20 also has the center hole 21 similarly to the rotating part 10a of the 1st hinge board 10. As shown in FIG. The center hole 21 formed in the rotating part 20a of the second hinge plate 20 has a fixing part formed in the same shape at the same position as the center hole 11 formed in the rotating part 10a of the first hinge plate 10 ( 21a) and a circular free portion 21b formed to communicate with the fixing portion 21a at an upper side of the fixing portion 21a. Here, the circular free 21b is formed to a size larger than the rhombus fixing 21a. In addition, the strut connection portion 20b of the second hinge plate 20 is also connected to the strut of the ladder through riveting, similarly to the strut connection portion 10b of the first hinge plate 10, and a circular fixing hole is formed at an upper side thereof. 22) is formed.

The first hinge plate 10 and the second hinge plate 20 formed as described above are assembled to each other by a center pin 41 fastened through the center holes 11 and 21. Thus, the center pin 41 has a fixing portion of a shape corresponding to the rhombic center hole 11 of the first hinge plate 10, and the fixing portion 21a of the second hinge plate 20 and It can be moved between the free portions 21b. When the center pin 41 is positioned at the fixing portion 21a of the second hinge plate center hole 21, the first hinge plate 10 and the second hinge plate 20 are fixed to each other and do not move. In a state in which 41 is positioned at the free portion 21b of the second hinge plate center hole 21, the first hinge plate 10 and the second hinge plate 20 may be rotated with each other. The center pin 41 is screwed to its end as shown in the figure can be fastened with a nut, or may be fastened by a riveting process.

Meanwhile, the clamp 30 is a member assembled to the guide hole 12 of the first hinge plate 10 and the fixing hole 22 of the second hinge plate 20 through connecting pins 42 and 43, respectively. It has an elongated plate shape. At one end of the clamp 30, a guide hole 31 having a shape similar to the guide hole 12 of the first hinge plate 10 is formed. That is, the guide part 31a is formed long and thin in the longitudinal direction of the clamp 30, and the lock part 31b is extended upward from one side end of the said guide part 31a. At the other end of the clamp 30, a circular fixing hole 32 is formed. As such, the clamp 30 having the guide hole 31 and the fixing hole 32 has a second connection pin 43 passing through the fixing hole 22 of the guide hole 31 and the second hinge plate 20. The first hinge plate 10 and the second hinge plate (2) are fastened by being fastened through the fixing hole 32 and the guide hole 12 of the first hinge plate 10. 20) is assembled to connect. At this time, the connecting pins 42 and 43 for assembling the clamp 30 and the first and second hinge plates 10 and 20 are guide holes 12 and guides of the clamp 30 of the first hinge plate 20. Can be moved along the ball 31. The first connecting pin and the second connecting pin are also fastened by a nut or by riveting like the center pin.

For reference, reference numerals 13 and 23, which are not described, are rivet balls, and 44 are penetrated and fastened through the rivet balls (not shown) formed in the rivet balls 13 and 23 and the struts of the ladder to support the strut connection parts 10b and 20b. It is a rivet to connect the prop of the ladder with.

Folding hinge hinge according to the present invention having the configuration as described above is operated as follows.

First, as shown in FIG. 2, the center pin 41 is positioned at the fixing portion 21a of the second hinge plate center hole 21 in a state where the hinge is completely folded. In addition, the first connecting pin 42 is positioned below the guide hole 12 formed in the support connecting portion 12 of the first hinge plate 10, and the second connecting pin 43 is formed of the clamp guide hole 31. It is located in the lock 32. Therefore, the first hinge plate 10 and the second hinge plate 20 are kept fixed so as not to move with each other.

Second, when the ladder is unfolded at an angle of 30 degrees, that is, to be used in the form of 'A', while holding the strut (not shown) of the ladder with both hands in the state of FIG. 2, the center pin 41 has a second hinge plate. The first hinge plate 10 is lifted up so as to move to the free portion 21b of the center hole 21 of 20, and spreads outward. As the first hinge plate 10 is opened, the first connecting pin 42 moves upward along the guide portion 10a of the first hinge plate guide hole 12. The first connecting pin 42 is moved to the upper end of the guide 12a, and then slightly lowers the first hinge plate 10 so that the center pin 41 is fixed to the center hole 21 of the second hinge plate 20. When inserted into (21a), the first connecting pin 42 is located in the locking portion 12b of the guide hole 12, the hinge is fixed in a state opened in 30 degrees, as shown in FIG. In other words, it is possible to use the ladder fixed in the 'A' form.

Third, when the ladder is to be rotated 180 degrees, that is, in the form of '-', the center pin 41 is opened in the 'A' form in the fixing portion of the second hinge pin center hole 21 ( Instead of inserting into 21a), slightly lift the second hinge plate 20 so that the second connecting pin 43 escapes from the locking portion 31b of the clamping guide hole 21 to the guide portion 31a. Continue to open both struts of the ladder. Then, the first connecting pin 42 is moved along the guide portion 12a of the first hinge plate guide hole 12, and the second connecting pin 43 is the guide portion 12a of the clamping guide hole 31. And the second connection pin 43 is moved along the guide portion 31a of the clamping guide hole 31 so that the hinge can be fully opened by 180 degrees. After the hinge is fully opened, the second connecting pin 43 is inserted into the locking portion 31b of the clamp guide hole 31 and the center pin 41 is fixed to the fixing portion 21a of the second hinge plate center hole 21. When inserted into the hinge, the hinge is fixed so as not to move in a state of 180 degrees apart. Therefore, the ladder can be used in the form of '-'.

The folding ladder hinge according to the present invention as described above is operated only once by opening both sides of the strut connection while holding both strut connection portions with both hands and removing the center pin from the fixing portion of the second hinge plate center hole freely. Since the ladder can be easily developed into a desired shape, the inconvenience of having to deploy the ladder through various steps as in the prior art is eliminated, and thus there is an advantage that it is very convenient to use. In addition, the hinge for folding ladder according to the present invention consists of two hinge plates and one clasp and several rivets has the advantage that the structure is very simple compared to the prior art.

Claims (3)

It consists of a supporting portion connected to the support of the ladder of the one side, and a rotating portion having a rhombus-shaped center hole, the support connecting portion is a guide hole consisting of a guide portion formed in the longitudinal direction and the locking portion extending at right angles from the upper end of the guide portion Branch having a first hinge plate; It consists of a strut connection part connected to the strut of the other ladder, and the rotating part, the rotating part is composed of a rhombus-shaped fixing part corresponding to the center hole of the first hinge plate and a circular free part formed on the upper part of the fixing part, The second hinge plate having a fixing hole on the upper one side of the support connecting portion: A center pin penetrating the center hole of the first hinge plate and the second hinge plate to hinge the first hinge plate and the second hinge plate; To limit the rotation angle of the first hinge plate and the second hinge plate, one end portion is formed with a guide hole formed in the longitudinal direction and a locking portion extending at right angles from the inner end of the guide portion, the other end The locking portion is formed with a circular fixing hole; And The first hinge plate and the clamping hole through the guide hole of the first hinge plate and the clamping hole, and the first hinge plate and the clamping hole through the guide hole of the fixing hole of the second hinge plate and the first hinge plate And a second connecting pin, wherein the hinge for the folding ladder The hinge of claim 1, wherein the center pin and the first and second connection pins are fastened by nuts, respectively. The hinge of claim 1, wherein the center pin and the first and second connection pins are fastened by riveting, respectively.