TWM577895U - Improved two-pin press type ladder hinge - Google Patents

Abstract

An improved two-pin press type ladder hinge comprises two outer hinge shell pieces, two inner hinge pieces, a rivet pivot, a conical compression spring, a press knob with concave circumferential sides and a locating pin activating plate device; the rivet pivot is located at the center of the hinge, the compression spring and the press knob are disposed at one side of the rivet pivot, the locating pin activating plate device is disposed at the other side of the rivet pivot with a center shaft jointing the press knob and two locating pins parallel to the center shaft, each locating pin has a round end part with a round touch jut extending therefrom; the back side of the activating plate device has a long handle for being held and operated easily.

Description

Improved two-pin press type ladder joint

This creation is about a two-pin press-type ladder joint, and more specifically, an improved two-pin press-type ladder joint, which enables the ladder joint to perform simple and reliable non-deduction and deduction operations.

The patent No. 89211686 discloses a three-pin joint for a ladder, which mainly uses a fixing plate with three lock pins, three positioning holes of the joint shell piece and nine positioning holes of the joint inner shell piece to unlock the three lock pins. And the locking operation; not only the high production cost, the use of nine positioning holes in the joint shell, the small distance between the holes, resulting in low strength of the joint shell, the hole is easily deformed and damaged after being stressed; In addition, the aforementioned The circular push button knob of the three-pin ladder is not easy to grip and slips easily. In addition, the front ends of the three locking pins in the 89211686 patent are in the shape of rectangular parallelepiped ends, and Korean Patent Application Publication No. 95-9197 discloses a two-pin ladder joint, and the ends of the locking pins with an inclined taper also extend outward. The straight-shaped convex end can be moved to the locking hole of the joint housing sheet with a flat-shaped groove to form an unlocked state. Because the flat-shaped convex end and the flat-shaped groove are in surface contact, the friction generated is naturally greater than the point contact. Smoothness of movement in the direction of movement; In addition, the locking pin with inclined taper has low strength and high chance of fracture.

The main purpose of this creation "Improved Two-Pin Pressing Ladder Joint" is to The conventional three-locating pin type and two-locating pin type ladders have missing joints and improved; changing the three-locating pins to two-locating pins reduces the number of positioning holes in the joint inner shell piece, reduces the manufacturing cost, reduces the probability of damage, and improves positioning The pin structure allows the front end of the positioning pin to make point contact with a joint shell, reducing friction, improving sliding smoothness, and strengthening its strength.

In order to achieve the above purpose, the "improved two-pin press-type ladder joint" in this creation includes an outer joint portion combined by a first joint shell piece and a second joint shell piece, and an inner joint portion combined by a two-joint inner shell piece. A riveting shaft, a compression spring, a push button handle, and a positioning pin actuating plate device; wherein the arcuate end of the positioning pin on one side of the positioning pin actuating plate device extends a round head, and the back of the positioning pin actuating plate device is It has a long grip, which runs through the positioning pin to actuate the plate device; the positioning holes of the shell of the first joint shell piece respectively extend a long slot corresponding to the convexity of the round head along the centerline of the arc, so as to make the round head 扺The convex can slide into it, so that the arcuate end of the positioning pin can push the joint shell piece. In addition, the push button is set to have a periphery formed by multiple concave edges, which is convenient for holding without slipping.

1‧‧‧ positioning pin actuating plate device

11,12‧‧‧Positioning pins

13‧‧‧Linked central axis

14‧‧‧ Long Grip

111,121‧‧‧ round head

112,122‧‧‧Circular small groove

21,22‧‧‧Joint shell film

211,212,221,222‧‧‧ Housing positioning holes

2111,2121‧‧‧long card slot

31,32‧‧‧Joint inner shell

331,332,333,334,335,336‧‧‧Inner housing positioning hole

4‧‧‧ riveting shaft

5‧‧‧ Conical compression spring

6‧‧‧Press the knob

Figure 1 is an exploded perspective view of the creation of the "improved two-pin press-type ladder joint".

Figure 2 is a perspective view of the creation of the "improved two-pin press-type ladder joint".

Figure 3 is another perspective view of the creation of the "improved two-pin press-type ladder joint".

FIG. 4A is an enlarged perspective view of the positioning pin actuating plate device in the “improved two-pin push-type ladder joint” of the present invention shown in FIG. 1. FIG.

FIG. 4B is a schematic perspective view of the other surface (rear surface) of the fixed pin actuating plate device shown in FIG. 4A.

FIG. 5 is a schematic cross-sectional view of the creation of the “improved two-pin push-type ladder joint” in a locked state.

FIG. 6 is a schematic cross-sectional view of the creation of the “improved two-pin push-type ladder joint” in an unfastened state.

FIG. 7 is a schematic diagram of the creation of the “improved two-pin push-type ladder joint” in a locked state without being opened.

FIG. 8 is a schematic diagram of the creation of the “improved two-pin push-type ladder joint” in a locked state and opened at a 30-degree angle.

FIG. 9 is a schematic diagram of the creation of the “improved two-pin push-type ladder joint” in a locked state and opened at an angle of 105 degrees.

FIG. 10 is a schematic diagram of the creation of the “improved two-pin push-type ladder joint” in a locked state and opened at an angle of 180 degrees.

Please refer to FIG. 1, FIG. 2, and FIG. 3. The “improved two-pin push-type ladder joint” in this creation basically includes an outer joint part and a second joint which are combined by a first joint shell piece 21 and a second joint shell piece 22. The inner joint part combined by the inner shell pieces 31 and 32 is a rivet shaft 4 located at the center of the outer joint part and the inner joint part and making the two joint parts pivotally fixed relative to each other, and a rivet shaft 4 and the joint shell A conical compression spring 5 on the outside of the plate 22, a push button handle 6 located beside the conical compression spring 5, and a positioning pin actuating plate device 1 located outside the joint housing plate 21; wherein the positioning pin actuating plate device 1 has a linkage center The shaft 13 protrudes in the direction of the two joints. The riveting shaft 4 and the conical compression spring 5 are used to fix the distal end of the shaft 13 with the pressing button 6. The positioning pin actuating plate device 1 is further provided with two parallel to the central axis 13 of the linkage. Positioning pins 11,12, both positioning Pins 11, 12 are symmetrically located on both sides of the central axis 13 of the linkage; the first joint shell sheet 21 has two shell positioning holes 211,212 and the second joint shell sheet 22 has two shell positioning holes 221,222 corresponding to the positioning pins of the central axis 13 respectively 11,12; The joint inner shell pieces 31,32 are respectively provided with three pairs of inner shell positioning holes (331,332), (333,334), (335,336), corresponding to the shell positioning holes 211,212,221,222.

Please refer to FIG. 4A and FIG. 4B and with the explanation of FIG. 1 and FIG. 2 and FIG. 3, the main feature of the “improved two-pin push-type ladder joint” is the positioning pin actuation plate device 1 and the push button handle 6. 4A and 4B are respectively an enlarged schematic view of the positioning pin actuation plate device 1 in FIG. 1 and a schematic view of the rear side of the positioning pin actuation plate device 1; wherein the positioning pins 11 and 12 in the positioning pin actuation plate device 1 are far away. The end is a circular arc end, and a round head bulge 111,121 is extended outward from the circular arc end; the positioning pin actuating plate device 1 faces away from the linkage central shaft 13 and the positioning pins 11, 12 with an elongated grip 14, The positioning pin actuates the back surface of the plate device 1. In the housing positioning holes 211 and 212 of the joint housing sheet 21 in FIG. 1, along the center line of the arc, respectively, a long slot 2111,2121 corresponding to a round head ridge 111,121 is formed, and the width and the round end of the long slot 2111,2121 The ridges have the same diameter so that the round head ridges 111,121 can slide into it, so that the arc ends of the positioning pins 11,12 can ridge the joint shell sheet 21. Because the round head ridges 111,121 are not straight and do not have a flat surface And the right angle, point contact with the long card slot 2111,2121, smooth sliding, and the strength is better than the conventional I-shaped convex end. In addition, the surface of the positioning pins 11, 12 is provided with a plurality of spaced-apart annular small grooves 112, 122. The portion between each of the two small annular grooves 112, 122 has a larger diameter, and has the effect of strengthening the strength of the positioning pins 11, 12. The periphery of the push button handle 6 is formed by multiple concave sides (the periphery shown in FIGS. 1 and 2 is eight concave sides, which is purely an example and is not limited), so that the user can hold it tightly without slipping.

Please refer to FIG. 5 and FIG. 6 and the explanation of FIG. 1. The person shown in FIG. 5 is the “improved two-pin press-type ladder joint” for this creation, and the positioning pin 11 is located in the positioning plate actuating plate device 1, 12 One of the three joint positioning holes (331,332), (333,334), (335,336) of the first joint shell sheet 21 and the second joint shell sheet is sequentially extended through the shell positioning holes 211,212 of the first joint shell sheet 21, The housing positioning holes 221, 222 of 22; at this time, the compression spring 5 is not compressed. The one shown in FIG. 6 is a round head with convex ends protruding from the arc ends of the positioning pins 11 and 12 in the positioning pin actuating plate device 1 for the "improved two-pin press-type ladder joint" in this creation. 111, 121 slide into the long slot 2111,2121 of the housing positioning holes 211,212 of the joint housing sheet 21, respectively, so that the arc ends of the positioning pins 11,12 are the top joint housing sheet 21; at this time, the compression spring 5 is compressed .

Please refer to FIG. 5 and FIG. 6 again and cooperate with the explanations of FIG. 2 and FIG. 3. When the operation of changing from the detented state shown in FIG. 5 to the non-detained state of FIG. Push the elastic force of the compression spring 5 toward the outer joint and the inner joint, until the round heads 111, 121 of the positioning pins 11, 12 reach the housing positioning holes 211, 212 of the joint housing sheet 21, and simultaneously press toward the face shown in FIG. 2 Turn the knob 6 clockwise when pressing the outside of the knob 6, and rotate the positioning pins 11, 12 by the torsion of the compression spring 5, so that the round head 111, 121 slides into the long slot 2111 of the positioning holes 211, 212 of the housing, In 2121, an unfixed state is formed. When the operation from the non-detented state shown in FIG. 6 to the detained state of FIG. 5 is performed, the positioning pin can be used to actuate the elongated grip 14 on the back of the plate device 1 and resist the torsion of the compression spring 5 to as shown in FIG. 3. The clockwise rotation of the positioning pins 11 and 12 as shown in the clockwise direction facing the back of the positioning pin actuating plate device 1 is moved away from the long slots 2111,2121 of the positioning holes 211,212 of the housing. The spring 5 is in a compressed state, and the housing positioning holes 211,212, In the case where 221,222 is aligned with one of the three pairs of inner casing positioning holes (331,332), (333,334) and (335,336), the positioning pins 11,12 extend through the positioning holes of the first joint shell by the rebound force of the compression spring 5. 211,212, one of three pairs of inner casing positioning holes (331,332), (333,334) and (335,336) and the second joint casing positioning holes 221,222 form a buckled state.

Please refer to FIG. 7, FIG. 8, FIG. 9, and FIG. 10. In each figure, only the joint shell sheet 22 and the joint inner shell sheet 32 represent the outer joint portion and the inner joint portion, respectively, and are first shown; This is a schematic diagram of the fastening state of the second joint shell sheet 22 relative to the joint inner shell sheet 32 when the angle is not expanded. The positioning pins 11, 12 respectively extend through the shell positioning holes 221, 222 and the inner shell positioning holes 331, 332. At this time, the ladder is at Collapsed but not used; Figure 8 is a schematic diagram of the fastening state when the joint shell sheet 22 is opened at an angle of 30 degrees relative to the joint shell sheet 32. The positioning pins 11, 12 extend through the positioning holes 221, 222 and Inner housing positioning holes 333,334, at this time the ladder can be used as A-shaped ladder; Figure 9 is a schematic diagram of the fastening state when the joint shell piece 22 is opened at an angle of 105 degrees with respect to the joint inner shell piece 32, the positioning pin 11, 12 Extend through the housing positioning holes 221,222 and the inner housing positioning holes 335,336, respectively. At this time, the ladder can be used as a platform ladder; Figure 10 shows the buckle when the joint shell sheet 22 is opened 180 degrees relative to the joint shell sheet 32. Fixed state diagram, positioning pins 11, 12 extend through housing positioning holes 222, 221 and inner housing positioning holes 331, 332, respectively At this time, the ladder can be used as a straight ladder.

The above embodiment of the "improved two-pin press-type ladder joint" of this creation is explained in detail, the purpose is to make those familiar with the technology understand that this creation can achieve the aforementioned purpose, not to limit this creation, the replacement of ordinary equivalent components , Changes, etc. should still fall within the scope of this creation. In addition, the creation of the "stepped stepped platform with retractable rear caster device" is in line with the utility, novelty, and progress of the industries referred to in the Patent Law. Please, I sincerely welcome the formal examination and grant the patent.

Claims (8)

An improved two-pin push-type ladder joint includes: an outer joint portion formed by combining a first joint shell piece and a second joint shell piece; an inner joint portion formed by combining two joint inner shell pieces; A riveting shaft is located at the center of the outer joint portion and the inner joint portion and allows the two joint portions to be pivoted relative to each other and fixed together; a conical compression spring is located beside the riveting shaft and the second joint shell piece side; The push button handle is located next to the conical compression spring; and the positioning pin actuating plate device is located on the side of the first joint shell piece, and one side is provided with a linked central axis that protrudes in the direction of the two joints, and passes through the riveting shaft and the conical compression spring. , Fixed with the push button handle; the positioning pin actuating plate device is provided with two positioning pins parallel to and symmetrical to the linking central axis on the same surface of the linking central axis, and the distal end of each positioning pin is an arc end And a round head protrudes outward from the arc end; the other side of the positioning pin actuating plate device is provided with a long grip back to the linkage central axis and the positioning pin, penetrating the positioning pin actuating plate device. The improved two-pin push-type ladder joint as described in claim 1, wherein the push button handle has a multi-concave-shaped perimeter, which is convenient for gripping and does not slip. The improved two-pin push-type ladder joint described in claim 1, wherein the first joint shell piece and the second joint shell piece are respectively provided with two shell positioning holes, corresponding to the aforementioned two positioning pins and the two joint pins of the first joint shell piece. The positioning hole of the housing extends a long slot along the arc to the centerline, corresponding to the two positioning pins of the positioning pin actuation plate device. The width of the long slot is equal to the diameter of the round head of the positioning pin, which makes the round head convex You can slide into it. The improved two-pin push-type ladder joint described in claim 1, wherein the two joint inner shell pieces are respectively provided with a first pair of inner shell positioning holes, a second pair of inner shell positioning holes, and a third pair of inner shell positioning holes. , Corresponding to the two housing positioning holes of the first joint housing sheet and the second joint housing sheet, respectively, where the first pair of inner shell positioning holes and the second pair of inner shell positioning holes are 30 degrees apart, and the first pair of inner shell positioning holes and the third The positioning holes of the inner shell are separated by 105 degrees. The improved two-pin push-type ladder joint according to claim 4, wherein when the two positioning pins of the positioning pin actuating plate device extend through the first pair of inner casing positioning holes and the first joint casing sheet and the second joint casing sheet When the positioning holes of the two shells form a buckled state, at this time, the outer joint part is not opened relative to the inner joint part, and the ladder is not in use. The improved two-pin push-type ladder joint according to claim 4, wherein when the two positioning pins of the positioning pin actuating plate device extend through the second pair of inner casing positioning holes and the first joint casing sheet and the second joint casing sheet In the fastening state formed by the positioning holes of the two shells, at this time, the outer joint part is opened at an angle of 30 degrees relative to the inner joint part, and the ladder can be used as an A-shaped ladder. The improved two-pin push-type ladder joint described in claim 4, wherein when the positioning pins actuate the plate device, the two positioning pins extend through the third pair of inner casing positioning holes, the first joint casing sheet, and the second joint casing sheet. In the fastening state formed by the positioning holes of the two shells, at this time, the outer joint part is opened at an angle of 105 degrees with respect to the inner joint part, which can be used as a platform ladder. The improved two-pin push-type ladder joint according to claim 4, wherein when the two positioning pins of the positioning pin actuating plate device extend through the first pair of inner casing positioning holes and the first joint casing sheet and the second joint casing sheet Two outer casing positioning holes, but when the positions of the first pair of inner casing positioning holes are reversed to form a fixed state of the buckle, the outer joint portion is opened at an angle of 180 degrees with respect to the inner joint portion, and the ladder can be used as a straight ladder.