WO2005045172A1

WO2005045172A1 - A locating hinge for folding ladder

Info

Publication number: WO2005045172A1
Application number: PCT/CN2004/001290
Authority: WO
Inventors: Luhao Leng
Original assignee: Luhao Leng
Priority date: 2003-11-11
Filing date: 2004-11-11
Publication date: 2005-05-19

Abstract

A locating hinge for a folding ladder: comprises: a right connecting arm (2) and a left connecting arm (1), a circle crustiform body (200) provided at a end portion of the right connecting arm (2), a discoid body (100) with some locating notches (101, 102, 103) in its circumferential edge provided at a end portion of the left connecting arm (1), a locating piece (6) coupled with the locating notches, a crank (14) with a first end portion (1401) connected to a end portion of the locating piece (6 ) rotatablely, and a middle part (402) connected to the right connecting arm (2 ) by a pin (17), a torsional spring (16) which makes the first end portion (1401) of the crank (14) compressed tightly towards the discoid body (100), an additional connecting arm (15) of which a first end portion (1501) is connected with a second end portion (1403) of the crank (14) by flexible connection, a projecting portion (1503 ) extending outwardly from the second end portion of the connecting arm (15), a handwheel (3) which rotating round a main shaft (4) and driving the connecting arm .The locating hinge according to the present invention is more convenient and reliable than the departed hinge structure, and its service life is longer.

Description

Folding ladder positioning hinge

Technical field

The invention relates to a structural component of a folding ladder, in particular to a positioning hinge structure of a folding ladder.

Background technique

The existing folding ladder is usually composed of two ladder frames connected by a hinge on the top of the ladder frame. By adopting a specific structure for the hinge, the two ladder frames can be rotated to a certain angle and fixed at the position, so that People adjust the height and inclination of the folding ladder to meet the needs of different use occasions. At present, many attempts have been made on the design of the hinge structure, and there are roughly two basic structures:

The principle of the first structure is roughly as follows: the outer movable joint and the inner movable joint constitute a rotatable connection through a pin, a plurality of positioning gaps are provided on the circumferential surface of the inner movable joint, and a positioning block is correspondingly provided on the outer movable joint to engage the positioning. In the notch, a trigger capable of pulling the positioning block is provided. When the trigger is pulled, the positioning block can slide away from the positioning notch and rotate to another positioning notch under the action of the reset spring to be engaged therein. In order to adjust the height and inclination of the folding ladder. For example, Chinese patent "A positioning joint of a folding ladder", patent number 92219132.8, its main feature is that the positioning block is composed of two cuboid blocks fixed to each other, one of which can extend into the positioning gap. One of the other The side includes a flat surface and an inclined curved surface, and the end of the trigger abuts against the side. When the trigger is triggered, its end can slide between the flat surface and the inclined curved surface to pull the positioning block out of the positioning gap; , Chinese patent "Folding Ladder Positioning Joint", its patent number is 99240192.5, its main feature is the use of a fork set at one end on the bottom of the positioning block, through the rotation of the fork, push the positioning key out of the positioning gap, and the rotation axis of the fork A shaft hole with a keyway is provided therein, and a user can install a triggering device therein to rotate the fork. Other similar structures include: Chinese patent "multi-purpose folding ladder" with patent number 96245810.4; and Chinese patent "multi-purpose metal folding ladder" with patent number 88201354.8.

The disadvantages of the above-mentioned hinge structure are: first, during use, the friction between the wrench and the positioning block is frictional, so that the fit is not smooth and easy to wear; second, the wrench protrudes outside the hinge and is easy to hang on people's clothes; Third, during the operation, the wrench is subject to a large force and is easy to be damaged. Fourth, when the operator pulls the wrench, the hinge must be rotated by a certain angle so that the positioning block is separated from the position where the positioning gap overlaps, and then it can be released. Wrench, otherwise the positioning block will slide into the positioning gap again, hindering the rotation of the hinge.

The basic principle of the second structure is: it includes a hinge outer plate and a hinge inner plate rotatably connected by a pin, the end of the pin protruding from the outside of the hinge outer plate is threaded with a hand wheel, and the pin is protruding A circular pin gland is fixedly connected to the inner end of the hinge inner plate. A spring is sleeved on the pin between the pin gland and the hinge inner plate. The pin gland is opposite to the hinge inner plate. On the side, positioning protrusions distributed along the circumference of the afternoon are provided. Corresponding parts of the hinge inner plate and the hinge outer plate are provided with a plurality of positioning holes that cooperate with the positioning protrusions. The hinge is fixed to the hinges through the cooperation of the positioning protrusions and the positioning holes. At a certain angle, by rotating the hand wheel, the pin can be moved in the direction of the pin gland under the thread connection between the hand wheel and the pin, thereby pushing the positioning post out of the positioning hole, and the hinge is in a rotatable state. When the hinge is rotated to a desired position and the positioning holes of the hinge outer plate and the hinge inner plate overlap, the hand wheel is rotated in the other direction, so that the pin drives the positioning protrusion to be inserted into the positioning hole, so that the hinge Fixed. This kind of structure is adopted; Chinese patent "multifunctional aluminum alloy folding ladder", patent number 91206854.X; + national patent "multifunctional convenient folding ladder", patent number 02271377.8.

Because the above-mentioned hinge structure uses a hand wheel, it overcomes the disadvantages caused by the use of a wrench, but during use, the positioning protrusions are not easily aligned with the positioning holes on the hinge inner plate and the hinge outer plate; in addition, the hand wheel It will also experience strong sliding friction on the inside when turning.

In summary, the existing hinge structure of the folding ladder still has the disadvantage of needing improvement. Summary of the invention

The present invention provides a positioning hinge of a folding ladder, whose main purpose is to overcome the shortcomings of the hinge structure of the existing folding ladder.

The technical solution of the present invention includes: a hollow right connecting arm and a left connecting arm, a round shell-shaped body is provided at an end portion of the right connecting arm, and a disc-shaped body is provided at an end portion of the left connecting arm, and the disc-shaped body is matched with the round shell The shape body is rotatably connected with the shell-shaped body through the main shaft. The circumferential edge of the disc-shaped body is provided with a plurality of positioning notches, and a positioning block that can fit in the positioning notch is also included. A crank is also included. The first end of the crank is rotatably connected to the end of the positioning block, and the middle part of the crank is rotatably connected to the right connecting arm through a pin. The pin is sleeved so that the first end of the crank can be oriented toward the disc-shaped body. A compressed torsion spring; another connecting arm, the first end of the connecting arm is movably connected to the second end of the crank, the middle part of the connecting arm is rotatably sleeved on the main shaft, and the second end of the connecting arm is provided with a The convex portion extending outside is provided with an arc-shaped accommodating groove at a corresponding position on the circular shell-shaped body; a hand wheel that can be rotated around the main axis of rotation is also provided, and the hand wheel can pull the connecting arm to rotate together.

The inner side of the hand wheel is provided with a locking hole that engages with the protruding portion on the connecting arm, and the protruding portion on the connecting arm is engaged in the corresponding locking hole of the hand wheel. The preferred solution is that the hand wheel can be disengaged. The connecting arm rotates, that is, the hand wheel cannot drive the connecting arm to rotate in a fixed state, its positioning block is locked in the positioning gap, and the left and right connecting arms cannot rotate with each other to achieve the purpose of safety and reliability. In the rotating state, the hand wheel rotates to drive the connecting arm. Rotate the positioning block away from the positioning gap, and the left and right connecting arms can rotate with each other.

The positioning block is located in the hollow portion of the right connecting arm. Sliding grooves are provided at the corresponding parts of the two side walls of the right connecting arm, and the two sides of the positioning block are slid into the sliding groove. .

There are three positioning gaps. When the positioning block is fitted to the first positioning gap, the left connecting arm and the right connecting arm are aligned. When the positioning block is fitted to the second positioning gap, the left connecting arm and the right connecting arm are aligned. The positioning block is matched with When the third positioning gap is formed, the left connecting arm and the right connecting arm form an acute angle.

Furthermore, the present invention also includes two supplementary discs that can be rotated around the main axis of rotation, and the first and second supplementary discs are provided with arc-shaped sliding grooves that cooperate with each other on the circumference. A positioning rod is penetrated in the groove, and the positioning rods are fixed to the two side walls of the round shell-shaped body. The first supplementary disk is provided with a first and a second supplementary rod protruding in the radial direction, and a second supplementary rod. The disk is provided with a third supplementary lever and a connecting rod that protrude in a radial direction; when the positioning block is fitted to the first positioning gap, the arc-shaped chute of the first and second supplementary discs overlap each other. The compensation lever abuts on the upper side of the positioning block, and the lower edge of the first compensation lever projects beyond the peripheral edge of the disc-shaped body. The second compensation lever is located in a second positioning gap near the first positioning gap. Side, and the end of the second supplementary rod is an oblique arc surface, the side of the oblique arc surface close to the first positioning gap is flush with or located within the circumferential edge of the disc-shaped body, the oblique The side of the arc surface near the second positioning notch protrudes beyond the peripheral edge of the disc-shaped body, The third offset lever overlaps the third positioning notch, and the lower edge of the end of the third offset lever protrudes beyond the peripheral edge of the disc-shaped body; the connecting rod is located between the first offset lever and the second offset lever, A tension spring is provided between the first offset lever and the connecting rod.

The disc-shaped body at the end of the left connecting arm has a double-layered structure, and a circular body is sandwiched between the double-layered structure, the radius of the circular-shaped body is larger than the radius of the disc-shaped body, and the positioning block Corresponding to the n-shaped structure, the width of the opening is equal to the thickness of the torus, its two legs can be inserted into the positioning notches on both sides of the torus, the upper left side of the outer circumferential surface of the torus has an arc-shaped notch, and the right connecting arm A limiting block is pivotally arranged on the upper edge, and the limiting block is provided with a hook-shaped body, which can be fastened in a circular arc-shaped notch.

One of the structures of the hinged handwheel to drive the connecting arm may be a cylindrical body fixed on the outer surface of the round shell body against the handwheel. The cylindrical surface of the cylindrical body is provided with a plurality of stepped holes, and the stepped holes are close to The hand wheel has a small width. A sleeve is fixed on the inner side of the hand wheel. The sleeve is rotatably sleeved on the cylindrical body. The cylinder surface of the sleeve is provided with a plurality of hooks facing inward. Shaped body-corresponding to the smaller diameter portion of each stepped hole fitted to the cylindrical body, the round shell body and the inner bottom surface of the sleeve are connected by a spring, and a lug is provided on the outer cylindrical surface of the sleeve. A locking hole which is engaged with the protruding portion on the connecting arm is provided on the lug.

A bowl-shaped body is sleeved on the cylindrical outer periphery, and the bottom surface of the bowl-shaped body is fixedly connected to the outer surface of the circular shell-shaped body, and the bottom surface is also provided with a housing overlapping with the arc-shaped receiving groove on the circular shell-shaped body. A groove, and a side wall of the bowl is protruded into the hand wheel.

Another structure of the hinged hand wheel to drive the connecting arm is that a clutch disc is arranged in the hand wheel, the hand wheel and the clutch disc are both bowl-shaped, and the open ends of the clutch disc are facing each other, and the bottom surface of the clutch disc is fixed to the outer side of the circular shell, and An arc-shaped groove is provided which overlaps the circular-shaped accommodating groove on the circular shell, and the side edge of the side wall of the clutch plate is provided with an annular edge protruding outward. The outer diameter of the annular edge is slightly smaller than the inner diameter of the handwheel. There are several clutch grooves recessed to one side of the handwheel. The inner wall edge of the handwheel is provided with a number of inwardly protruding buckle portions that can abut against the outer wall of the clutch disc. The buckle portions can-correspondingly fit to the clutch. In the groove, a compression spring is provided between the clutch disc and the handwheel.

The annular side of the clutch plate is also provided with a plurality of assembling openings corresponding to the buckles in the hand wheel. Compared with the prior art, the present invention has the following advantages: firstly, the present invention uses a hand wheel, there is no triggering device protruding to the outside, and it does not catch on people's clothing; secondly, between the positioning block and the crank of the present invention For the rotary connection, it is different from the sliding friction between the trigger device and the positioning block in the past, thereby reducing the wear of the moving parts and prolonging its service life. Third, due to the use of a supplementary disk, when the hand wheel is turned to make the positioning block When leaving the positioning gap, even if the hand wheel is immediately released, the padding lever on the pad can prevent the positioning block from sliding into the positioning gap immediately. At this time, people can easily adjust the angle between the left connecting arm and the right connecting arm. Fourth, compared with the existing folding ladder hinge having a hand wheel structure, the present invention only needs to rotate the hand wheel during adjustment to disengage the positioning block from the positioning gap, and rotate the hinge to a certain position, and the positioning block automatically engages in positioning. In the notch, there is no problem that the positioning protrusion and the positioning hole are not easy to align in the past. Fifth, the hand wheel of the present invention is non-rotatable when it is not working, and only the hand wheel Before the rotation of the internal pressure, 'thus making the operation safer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of the present invention;

FIG. 2 is a view from A to A in FIG. 1;

3 is a schematic diagram of the internal three-dimensional structure of the front of the present invention; 4 is a schematic diagram of the internal three-dimensional structure on the back of the present invention;

FIG. 5 is a schematic diagram of a three-dimensional structure of a connecting arm of the present invention; FIG.

FIG. 6 is a schematic view of the three-dimensional structure of the crank of the present invention; FIG.

FIG. 7 is a schematic perspective structural diagram of a front side cover of a right connecting arm according to the present invention; FIG.

FIG. 8 is a schematic perspective structural view of a front side cover of a left connecting arm according to the present invention; FIG.

FIG. 9 is a schematic view of the three-dimensional structure of the first half of the torus of the present invention; FIG.

FIG. 10 is a schematic diagram of a three-dimensional structure of a hand wheel according to the present invention; FIG.

FIG. 11 is a schematic diagram of a three-dimensional structure of a cylindrical body according to the present invention; FIG.

Figure 12 is a schematic view of the three-dimensional structure of the fixing sheet of the present invention;

FIG. 13 is a schematic view of the three-dimensional structure of the sleeve of the present invention;

14 is a bottom view of the sleeve of the present invention;

FIG. 15 is a schematic diagram of a three-dimensional structure of a bowl-shaped body according to the present invention; FIG.

FIG. 16 is a schematic view of the three-dimensional structure of the first replacement disc of the present invention; FIG.

FIG. 17 is a schematic diagram of the three-dimensional structure of the second replacement disc of the present invention; FIG.

FIG. 18 is a schematic diagram of the three-dimensional structure of the limiting block of the present invention.

FIG. 19 is a schematic structural diagram of Embodiment 2 of the present invention.

20 is a cross-sectional view taken along the line A--A in FIG. 19 according to Embodiment 2 of the present invention.

FIG. 21 is a structural diagram of a hand wheel according to the second embodiment.

Fig. 22 is a structural diagram of the internal components of the handwheel of the second embodiment.

FIG. 23A is a structural diagram of a clutch wheel in Embodiment 2, and 23B is a cross-sectional view in the direction of rotation A-A.

Specific embodiment

Embodiment 1, referring to FIGS. 1 to 4, includes a hollow left connecting arm 1 and a right connecting arm 2, a circular shell-shaped body 200 is provided at an end of the right connecting arm 2, and a disc-shaped body is provided at an end of the left connecting arm 1. 100. The disc-shaped body 100 is fitted in the disc-shaped body 200, and is rotatably connected to the disc-shaped body 200 through the main rotating shaft 4. Referring to FIG. 8, a circumferential edge of the disc-shaped body 100 is provided with a first positioning gap. 101. The second positioning gap 102 and the third positioning gap 103 are further provided with a positioning block 6 that can fit in the positioning gap. The positioning block 6 is located in the hollow portion of the right connecting arm 2. Referring to FIG. The corresponding part of the side wall is provided with a sliding groove 202, and the two sides of the positioning block 6 are slidably disposed in the sliding groove 202. A crank 14 is also included. Referring to FIG. 6, a first end 1401 of the crank 14 is rotatably connected to the positioning block 6. At the end, the middle part 1402 of the crank 14 is rotatably connected to the right connecting arm 2 through a pin 17. The second end 1403 of the crank 14 is provided with a set of holes 1404, and the pin 17 is provided with a torsion spring 16. Spring 16—The extended end is fastened to the upper part of one end of the crank 14 笫 1401, and the other end is crested. To the inner bottom surface of the right connecting arm 2, so that the first end 1401 of the crank 14 can be pressed in the direction of the disc-shaped body 100, so that the positioning block 6 can be pressed and engaged in any positioning notch, and there is another connecting arm 15 Referring to FIG. 5, the first end 1501 of the connecting arm 15 is an upward circular convex portion 1501. The circular convex portion 1501 is sleeved in the sleeve hole 1404 of the second end 1403 of the crank 14. The middle part 1502 is rotatably sleeved on the main rotating shaft 4. The second end of the connecting arm 15 is provided with a protruding part 1503 extending outwardly. The corresponding part of the circular shell 200 is provided with an arc-shaped receiving groove 201. When the arm 15 rotates, its convex portion 1503 can move in the arc-shaped accommodation groove 201.

There is also a hand wheel 3 that can be rotated around the main shaft 4 as a center. A cylindrical body 10 is fixed on the outer surface of the round body 200 near the hand wheel. Referring to FIGS. 11 and 12, the cylindrical surface of the cylindrical body 10 Three stepped holes 1001 are provided. The width of the stepped hole 1001 near the hand wheel 3 It is relatively small. The cylindrical body 10 is fixed by three pins 1002 on its end surface and three notches 1102 on the circumferential surface of a fixing piece 11. The fixing piece 11 is provided with an outer buckle portion 1101 protruding from the circumference.

A sleeve 7 is fixed on the inner side of the hand wheel 3, and the sleeve 7 is rotatably sleeved on the outer periphery of the cylindrical body 10. Referring to FIGS. 13 and 14, a cylindrical surface of the sleeve 7 is provided with hooks facing inward in three directions. Shaped body 701, each hooked body 701-corresponding to a smaller diameter portion of each stepped hole 1001 fitted to the cylindrical body 10. The above-mentioned hand wheel 3 is fixed by being fitted with the projection 301 on the inner side thereof and the through hole 704 on the bottom surface of the sleeve 7.

A cylindrical body 12 is sleeved on the outer periphery of the cylindrical body 10. Referring to FIG. 15, the bottom surface of the bowl body 12 is also provided with an accommodation groove 1202 overlapping with the arc-shaped accommodation groove 201 on the circular shell 200. When it rotates, its convex portion 1503 can pass through and move in the arc-shaped receiving groove 201 and the receiving groove 1202. The side wall of the bowl 12 projects into the hand wheel 3, and the inner circumference of the bowl 12 is provided. There is an opening 1203, the buckle portion 1101 of the fixing piece 11 protruding outside its circumference is received in the bayonet 1203, and the front side wall of the round shell 200 is provided with a buckle hole 203 that cooperates with the buckle portion 1101. Therefore, The cylindrical body 10 and the bowl body 12 are fixed to the front side wall of the circular shell body 200. The bottom edge of the bowl-shaped body 12 is also provided with a notch 1204 corresponding to the sliding groove 202 on the front side wall of the round-shaped body 200.

The fixing piece 11 and the inner bottom surface of the sleeve 7 are connected by a spring 9. The outer cylindrical surface of the sleeve Ί is provided with a lug 702, a lug 703 is provided on the lug 702, and a protruding portion on the connecting arm 15 1503 is inserted into the card hole 703.

It can be seen from the above that the hand wheel 3 and the sleeve 7 are fixed to each other, and the sleeve 7 is fastened to the smaller diameter portion of each of the stepped holes 1001 of the cylindrical body 10 through its hook-shaped body 701, so the sleeve 7 is in non-working state. In the state, it is relatively fixed to the cylindrical body 10, and the cylindrical body 10 is relatively fixed to the outer wall of the circular shell 200 through the fixing piece 11, so the hand wheel cannot rotate relative to the circular shell 200; When the shell 200 presses down the handwheel 3, the hook body 701 on the sleeve 7 extends to the larger diameter portion of the stepped hole 1001, so the sleeve 7 can rotate within the range of the larger diameter portion of the stepped hole 1001. At this time, the protruding portion 1503 of the connecting arm 15 can be driven to move, so that the crank 14 is driven to move, and the positioning block 6 is released from the positioning gap.

When the positioning block 6 is fitted to the first positioning gap 101, the left connecting arm 1 and the right connecting arm 2 are aligned, and when the positioning block 6 is fitted to the second positioning gap 102, the left connecting arm 1 and the right connecting arm 2 are aligned at a right angle. 6 When the third positioning gap 103 is fitted, the left connecting arm 1 and the right connecting arm 2 form an acute angle.

It also includes a first compensation plate 18 and a second compensation plate 19 that can be rotated around the main rotating shaft 4 as a center. Referring to FIGS. 16 and 17, the first compensation plate 18 and the second compensation plate 19 are respectively provided on the circumference. Coordinated arc-shaped chute 1802 and 1902, a positioning rod 20 is penetrated in the arc-shaped chute 1802 and 1902, and the positioning rod 20 is fixed between two side walls of the circular shell 200, and the first supplementary disk 18 A first supplementary rod 1803 and a second supplementary rod 1804 protruding in a radial direction are provided, and a third supplementary rod 1904 and a connecting rod 1903 protruding in a radial direction are provided on the second supplementary disc 19; a positioning block When mating with the first positioning notch 101, the arc-shaped sliding grooves 1802 and 1902 of the first and second filling plates 18 and 19 overlap each other, and the first filling rod 1803 abuts on the upper side of the positioning block 6, In addition, the lower edge of the first compensation lever 1803 protrudes beyond the peripheral edge of the disc-shaped body 100, the second compensation lever 1804 is located on the side of the second positioning gap 102 near the first positioning gap 101, and the second compensation Rod 1804 end The part is an oblique arc surface, the side of the oblique arc surface close to the first positioning gap 101 is flush with or located within the circumferential edge of the disc-shaped body 100, and the oblique arc surface is close to the second positioning One side of the notch 102 protrudes beyond the peripheral edge of the disc-shaped body 2, the third positioning lever 1904 overlaps with the third positioning notch 103, and the lower edge of the end of the third positioning lever 1904! ¾ extends outside the peripheral edge of the disc-shaped body 100; the connecting rod 1903 is located between the first and second complementary rods 1803 and 1804, and a tension spring 21 is provided between the first and second complementary rods 1803 and 1903, The two ends of the tension spring 21 are hung on the hanging holes 1805 on the first compensation rod 1803 and the hanging holes 1905 on the connecting rod 1903, and the circumferences of the first compensation disk 18 and the second compensation disk 19 are respectively. Straight faces 1806 and 1906 are provided to give way to the tension spring 21.

The disc-shaped body 100 at the end of the left connecting arm 1 has a double-layered structure, and a circular body 13 is sandwiched between the double-layered structures. The radius of the circular-shaped body 13 is larger than the radius of the disc-shaped body 100. The positioning block 6 corresponds to a Π-shaped structure, the opening width of which is equal to the thickness of the ring body 13, the two legs can be inserted into the positioning gaps on both sides of the ring body 13, the ring body 13 is a double layer structure, and the single layer body is shown in the figure 9. The upper left side of the outer circumferential surface is provided with a circular arc-shaped notch 1301, three positioning projections 1302 are provided on the inner circumference, and three positioning holes 104 corresponding to the double-layer structure of the disc-shaped body 100 are matched with each other. A disc-shaped body 100 is fixed to it.

A limiting block 5 is pivotally provided on the upper edge of the right connecting arm 2. Referring to FIG. 18, the limiting block 5 is provided with a hook-shaped body 501 and two downwardly extending ear-shaped bodies 502. A recess 503 is provided in the middle of the hook-shaped body 501. The hook-shaped body 501 is buckled into the arc-shaped notch 1301 on the upper left side of the aforementioned annular body 13 through its notch 503. When the left connecting arm 1 and the right connecting arm 2 are aligned, the limiting block 5 can play a role of restricting the folding of the hinge.

It can be known from the above structure that when the hand wheel 3 is pressed and turned, the positioning block 6 is disengaged from the first positioning gap 101, and the first offset lever 1803 is rotated by the tension spring 21 within the range allowed by the arc-shaped slide groove 1802. At a small angle, the first positioning lever 1803 overlaps the first positioning gap 101. At this time, even if the hand wheel 3 is released, the positioning block 6 still cannot enter the first positioning gap 101, so the hinge can be easily turned. 6 Slide along the circumference of the disc-shaped body 100, slide over the inclined arc surface of the end of the second offset rod 1804, and snap into the second positioning gap 102, so that the left connecting arm 1 and the right connecting arm 2 form a right angle. When you press and turn the hand wheel 3 again, the walking block 6 is released from the second positioning gap 102, and the hinge is turned to make an acute angle. The positioning block 6 slides along the circumference of the disc-shaped body 100 to push the third complement lever 1904, and enters the first In the three positioning notches 103, at this time, the third offset lever 1904 abuts on the upper side of the positioning block 6.

Embodiment 2: This embodiment differs from Embodiment 1 only in the clutch mechanism of the handwheel, which is specifically described as follows:

Referring to FIG. 19 and FIG. 20 and FIG. 21, FIG. 22, and FIG. 23, a handwheel 3 is provided on the side of the circular housing 200. The handwheel 3 is embedded with an embedded piece 305 ', and a clutch disc is provided in the handwheel 3. 7 ', the handwheel 3 and the clutch disc 7' both have a bowl shape, and the open ends of the clutch disc 7 'are opposed to each other. The bottom surface of the clutch disc 7' is matched with the positioning hole 203 on the circular housing 200 by the positioning protrusion 77 'and does not match. The circular casing 200 is relatively rotated, and the clutch disc 7 'is provided with an arc-shaped groove 78' which overlaps with the arc-shaped receiving groove 201 on the circular casing 200, and the side edge of the clutch disc 7 'is provided with a convex protrusion. The annular edge 79 'has an outer diameter slightly smaller than the inner diameter of the handwheel 3. The annular edge 79' is provided with three clutch grooves 7, 72 ', and 73' recessed toward the side of the handwheel 3, the handwheel The inner wall edge of 3 is provided with three inwardly protruding buckle portions 302 ', 303', and 304 'that can abut against the outer wall of the clutch disc 7', and the buckle portions 302 ', 303', and 304 'can-correspondingly Fitted in the clutch grooves 7, 72 'and 73', a compression spring 8 'is also provided between the clutch disc 7' and the hand wheel 3 '. When the buckle portions 302 ', 303', and 304 'fit in the clutch grooves 7, 72', and 73 ', the handwheel 3' and the clutch disc 7 'are relatively fixed and cannot be rotated, and the handwheel 3' is pressed to make the buckle portion 302 ', 303', and 304 'can be separated from the clutch slots 7, 72, and 73', and the handwheel 3 'can be rotated. A set of holes 30 is provided on the inner side of the bottom surface of the hand wheel 3 ', and a protruding portion 1503 extending outward of the second end of the connecting arm 15 is inserted into the set of holes 301' through an arc-shaped groove 7g '. The rotation can drive the protruding portion 1503 to rotate, thereby driving the positioning block 6 to move. The ring side 79 'of the clutch plate 7' is also provided with three buckle portions 302 ', 303', and _{304 in the} handwheel 3, corresponding to the fitting ports 74 ', 75', and 76 'for the handwheel 3 Used when assembling with clutch disc 7 '.

The above is the adjustment of the hinge from a straight line to a right angle to an acute angle, and the adjustment process from an acute angle to a right angle to a straight line is the opposite. The principle is similar and will not be described again.

The above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial equivalent changes or simple substitutions made by using this concept should belong to the protection scope of the present invention.

Industrial applicability

The hinge of the folding ladder of the present invention uses a hand wheel, and there is no triggering device protruding from the outside, and it will not hook to people's clothing. Secondly, the positioning block and the crank of the present invention are rotationally connected, which is different from the conventional triggering device and The sliding friction between the positioning blocks reduces the wear of the moving parts and prolongs its service life. Third, because of the use of a supplementary disc, when the positioning block is turned away from the positioning gap by turning the hand wheel, even if the hand wheel is immediately released, The padding lever on the padding pad can also prevent the positioning block from sliding into the positioning gap immediately. At this time, people can easily adjust the angle between the left connecting arm and the right connecting arm. Fourth, it is similar to the existing handwheel structure. Compared with a folding ladder hinge, the hand wheel of the present invention pulls the connecting arm through a clutch device. Therefore, inadvertently touching the hand wheel cannot drive the hinge to rotate. Only when the hand wheel is intentionally depressed to leave the hand wheel lock position, the hand wheel Only by turning can the hinge be rotated to achieve safety and reliability.

Claims

Rights request

1. A folding ladder positioning hinge, comprising a hollow right connecting arm and a left connecting arm, a round shell-shaped body is provided at an end portion of the right connecting arm, and a disc-shaped body is provided at an end portion of the left connecting arm, and the disc-shaped body is matched with The circular shell-shaped body is rotatably connected with the circular shell-shaped body through the main shaft. The circumferential edge of the disk-shaped body is provided with a plurality of positioning notches, and a positioning block that can fit in the positioning notch is characterized by: A crank is also included, the first end of the crank is rotatably connected to the end of the positioning block, the middle of the crank is rotatably connected to the right connecting arm through a pin, and the pin is sleeved with the first end of the crank. 'A torsion spring compressed in the direction of a disc-shaped body; there is another connecting arm, the first end of the connecting arm is movably connected to the second end of the crank, and the middle part of the connecting arm is rotatably sleeved on the main shaft, the connecting arm The second end is provided with a protruding portion extending outward, a corresponding portion on the circular shell body is provided with an arc-shaped receiving groove; and a hand wheel that can be rotated around the main axis of rotation is provided. The hand wheel can drive the connecting arm.

2. The positioning hinge according to claim 1, wherein the inner side of the hand wheel is provided with a locking hole that engages with the protruding portion on the connecting arm, and the hand wheel can drive the connecting arm in a disengageable manner.

3. The positioning hinge according to claim 1, characterized in that the positioning block is located in the hollow portion of the right connecting arm, the corresponding parts of the two side walls of the right connecting arm are provided with sliding grooves, and the two sides of the positioning block are slid into the sliding grooves. ;

4. A folding ladder positioning hinge according to claim 1, wherein: there are three positioning notches, and the left connecting arm and the right connecting arm form a straight line when the positioning block is matched with the first positioning notch, and the positioning block cooperates When the second positioning gap is formed, the left connecting arm and the right connecting arm form an angle, and when the positioning block is matched with the third positioning gap, the left connecting arm and the right connecting arm form an acute angle.

5. The positioning hinge of a folding ladder according to claim 4, further comprising two supplementary discs rotatable around a main rotation axis, and the first and second supplementary discs are provided on the circumference of the disc. There is a matching arc-shaped chute, and a positioning rod is passed through the arc-shaped chute. The positioning rods are fixed to the two side walls of the circular shell-shaped body. A second paddle and a second paddle, the second paddle is provided with a third paddle and a connecting rod protruding in the radial direction; when the positioning block is fitted to the first positioning gap, the first paddle and the second paddle The arc-shaped chute of the position disk overlaps each other, the first supplementary lever abuts against the upper side of the positioning block, and the lower edge of the first supplementary lever projects beyond the peripheral edge of the disc-shaped body, and the second supplementary lever is located at The side of the second positioning notch that is close to the first positioning notch, and the end of the second complement 'rod is an inclined arc surface, the side of the inclined arc surface that is close to the first positioning notch is flat with the peripheral edge of the disc-shaped body Homogeneous or located in the peripheral edge of the disc-shaped body, the inclined arc surface is convex near one side of the second positioning gap Outside the peripheral edge of the disc-shaped body, the third supplementary lever overlaps the third positioning gap, and the lower edge of the end of the third supplementary rod protrudes beyond the peripheral edge of the disc-shaped body; the connecting rod is located at the first supplementary lever A tension spring is provided between the first compensation lever and the second compensation lever.

6. The folding ladder positioning hinge according to claim 1, wherein: the disc-shaped body at the end of the left connecting arm has a double-layer structure, and a ring body is sandwiched between the double-layer structures. The radius of the torus is greater than the radius of the disc-shaped body. The positioning block is a ΓΊ-shaped structure with an opening width equal to the thickness of the torus, and its two legs can be inserted and positioned on both sides of the torus. In the notch, a circular arc-shaped notch is formed on the upper left side of the outer circumferential surface of the ring. A limiting block is pivotally arranged on the upper edge of the right connecting arm, and the limiting block is provided with a hook-shaped body, which can be fastened in the arc-shaped notch.

7. A folding ladder positioning hinge according to claim 1, characterized in that: a cylindrical body is fixed on the outer surface of the round shell body against the handwheel, and a plurality of stepped holes are provided on the cylindrical surface of the cylindrical body. The width of the part of the stepped hole near the hand wheel is relatively small. A sleeve is fixed on the inner side of the hand wheel, and the sleeve is rotatably sleeved on the cylindrical body. The cylindrical surface of the sleeve is provided with a number of hooks facing inward. Body, each hook-shaped body-corresponding to the smaller diameter portion of each stepped hole fitted to the cylindrical body, the shell-shaped body and the inner bottom surface of the sleeve are connected by a spring, and a protrusion is provided on the outer cylindrical surface of the sleeve The ear, the engaging hole which is engaged with the convex portion on the connecting arm is provided on the ear.

8. A folding ladder positioning hinge according to claim 5, characterized in that: a cylindrical body is sleeved around the cylindrical outer body, and the bottom surface of the bowl body is fixedly connected to the outer side of the circular shell body, and The bottom surface of the bowl-shaped body is also provided with a receiving groove overlapping the arc-shaped receiving groove on the circular shell-shaped body.

9. The positioning hinge for a folding ladder according to claim 2, characterized in that: a clutch disc is arranged in the hand wheel, the hand wheel and the clutch disc are both bowl-shaped, and the open ends of the clutch disc are facing each other, and the bottom surface of the clutch disc is It is fixed on the outer side of the circular shell, and is provided with an arc-shaped groove overlapping the arc-shaped receiving groove on the circular shell. The edge of the side wall of the clutch plate is provided with an annular edge protruding outward. The outer diameter of the annular edge is slightly Smaller than the inner diameter of the hand wheel, the annular side is provided with a plurality of clutch grooves which are sunken to one side of the hand wheel, and the inner wall edge of the hand wheel is provided with a plurality of buckling portions which project inward and can abut the outer wall of the clutch disc The buckle can-correspondingly fit in the clutch groove, and a compression spring is provided between the clutch disc and the hand wheel.

10. The positioning hinge for a folding ladder according to claim 9, characterized in that: the annular side of the clutch disc is further provided with a plurality of fitting openings corresponding to the buckles in the hand wheel.