CN107201875A - Family expenses do not fall terraced - Google Patents
Family expenses do not fall terraced Download PDFInfo
- Publication number
- CN107201875A CN107201875A CN201710418943.XA CN201710418943A CN107201875A CN 107201875 A CN107201875 A CN 107201875A CN 201710418943 A CN201710418943 A CN 201710418943A CN 107201875 A CN107201875 A CN 107201875A
- Authority
- CN
- China
- Prior art keywords
- ladder
- cleat stanchion
- support bar
- hinge
- lateral support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/14—Ladders capable of standing by themselves
- E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
- E06C1/18—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as ladders
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/14—Ladders capable of standing by themselves
- E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
- E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/50—Joints or other connecting parts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
It is not terraced the invention provides a kind of family expenses, including：The two panels ladder being hinged by hinge hinge, first ladder includes：First vertical edge, the second vertical edge and the multiple horizontal edges being connected between first vertical edge and the second vertical edge, ladder also includes the family expenses：The the first lateral support bar for being arranged on the side of two panels ladder first and the second lateral support bar for being arranged on the side of two panels ladder second；The first lateral support bar and the second lateral support bar are hinged on the hinge hinge by articulated structure respectively；The articulated structure includes：The supporting leg axle sleeve being set on the hinge hinge that can be rotated and the supporting leg connecting shaft radially across the supporting leg axle sleeve, the axis of the vertical supporting leg axle sleeve of the axis of the supporting leg connecting shaft, the supporting leg is hinged on supporting leg axle sleeve by supporting leg connecting shaft, and the supporting leg is hinged on the hinge hinge by the supporting leg axle sleeve.Invention increases security.
Description
Technical field
The present invention relates to a kind of ladder, especially a kind of double ladder, specially a kind of family expenses do not fall terraced.
Background technology
Household ladder is mainly used on indoor smooth working face, and at present, conventional household ladder is double ladder.Double ladder is by two
Piece ladder is constituted, and first ladder is climbed provided with horizontal ladder or pedal for people, and second ladder is the support of support, does not supply people to climb
Climb, play a part of to support first ladder.Double ladder folding convenient, but not enough consolidate, easily fall down at work.
In summary, there is problems with the prior art：Double ladder is not enough consolidated, and is easily fallen down at work.
The content of the invention
The present invention provides a kind of ladder, and for example, family expenses are not terraced, not enough consolidated with solving double ladder, easily at work
The problem of falling down.
Ladder includes the family expenses of the present invention：The two panels ladder being hinged by hinge hinge, the ladder difference that two panels is hinged
For first ladder and second ladder, first ladder and second ladder are hinged to form double ladder, described first
Ladder includes：First vertical edge, the second vertical edge and the multiple horizontal edges being connected between first vertical edge and the second vertical edge, institute
Second ladder is stated to support the support of first ladder；
Ladder also includes the family expenses：It is arranged on the first lateral support bar of the side of two panels ladder first and is arranged on
Second lateral support bar of the side of two panels ladder second；The first lateral support bar and the second lateral support bar pass through respectively
Articulated structure is hinged on the hinge hinge；
The articulated structure includes：Can rotate the supporting leg axle sleeve being set on the hinge hinge and radially across institute
State the supporting leg connecting shaft of supporting leg axle sleeve, the axis of the vertical supporting leg axle sleeve of axis of the supporting leg connecting shaft, institute
State the first lateral support bar or the second lateral support bar is hinged on supporting leg axle sleeve by supporting leg connecting shaft, and institute
State the first lateral support bar or the second lateral support bar is hinged on the hinge hinge by the supporting leg axle sleeve.
Further, first vertical edge includes：The first main cleat stanchion for being hinged with the hinge hinge, it is arranged on described
The lower section of one main cleat stanchion and can the first flexible cleat stanchion and cleat stanchion locking device for sliding of relatively described first main cleat stanchion, it is described
First main cleat stanchion is connected with the first flexible cleat stanchion by the cleat stanchion locking device clamping.
Further, the cleat stanchion locking device includes：First location division of protrusion, the first main cleat stanchion or described the
One flexible cleat stanchion is provided with the first rack being connected with first location division clamping or multiple first grids arranged in strip,
First rack is provided with multiple parallel teeth, and multiple parallel teeth or multiple first grids are along the described first main ladder
The length direction arrangement of post or the first flexible cleat stanchion.
Further, the described first main cleat stanchion and first stretches cleat stanchion for rectangle or circle.
Further, the first lateral support bar includes：The second main cleat stanchion for being connected with two panels ladder, be arranged on it is described
The lower section of second main cleat stanchion and can relatively described second main cleat stanchion the second flexible cleat stanchion and support rod locking device that slide,
The second main cleat stanchion is with the second flexible cleat stanchion by supporting rod locking device clamping to be connected.
Further, the described second main cleat stanchion and second stretches cleat stanchion for rectangle or circle, the support rod locking device
For alignment pin.
Further, ladder also includes the family expenses：
First connecting rod, is movably connected between first ladder and the first lateral support bar；
Second connecting rod, is movably connected between second ladder and the first lateral support bar；
The first locking device of the first connecting rod and second connecting rod is locked, the first connecting rod and second connecting rod is connected；
First locking device is arranged on the first lateral support bar.
Further, the end of the hinge hinge is provided with positive stop lug boss, and one end of the axle sleeve is provided with pilot hole, described
Axle sleeve is set on the hinge hinge by pilot hole, and hole of the radial dimension more than pilot hole of the positive stop lug boss
Footpath, the other end of the axle sleeve offers open slot, and the supporting leg connecting shaft passes perpendicularly through the opening of open slot, the support
The top of leg is provided with the connecting portion being hinged with the supporting leg connecting shaft, and the connecting portion can be rotatably arranged at the open slot
In.
Further, the first connecting rod has the second of two ends, the respectively first end of first connecting rod and first connecting rod
End, the first end of the first connecting rod is fixedly connected on first ladder, the slidable company in the second end of first connecting rod
It is connected on the first lateral support bar；The second connecting rod has two ends, and the respectively first end of second connecting rod and first connects
Second end of bar, the first end of the second connecting rod is fixedly connected on second ladder, the second end energy of second connecting rod
That slides is connected on the first lateral support bar；First locking device is slidable to be arranged on the first lateral support bar
On, first locking device connects the first connecting rod and second connecting rod simultaneously.
Further, first locking device includes：
First lock sleeve, is set on the first lateral support bar, and first lock sleeve is the annular with opening,
First lock sleeve has the first lock sleeve first end and first the second end of lock sleeve；The opening is arranged on first lock
Between tight set first end and first the second end of lock sleeve；
The regulating bolt of the openings of sizes is controlled, through the opening, and first lock sleeve first is connected to
Between end and first the second end of lock sleeve；The length side of the vertical first lateral support bar of the length direction of the regulating bolt
To；The head end of the regulating bolt is nut, and the tail end of the regulating bolt is screw rod end；
The hinge of locking device, is arranged on the tail end of the regulating bolt, the vertical tune of length direction of the hinge
Save the length direction of bolt and the length direction of the parallel first lateral support bar；
Eccentric cam, is hinged on the hinge of the locking device and the outer rim of eccentric cam is pressed on first lock
On the lateral surface at the second end of tight set；
Handle, connects the eccentric cam；
Returning spring is locked, is set in the regulating bolt and positioned at the first lock sleeve first end and the first lock
Between the second end of tight set.
The family expenses of the present invention do not fall side of the ladder to provided with support bar, and two panels ladder is hinged on hinge hinge, support bar difference
It is hinged on by articulated structure on the hinge hinge, is hinged so that double ladder can form triadius type, adds herringbone
Side of the ladder to support, so as to add the lateral stability of double ladder, add the safety guarantee of double ladder work.
And then, connected respectively by first connecting rod and second connecting rod between the ladder that two panels is hinged, so, add first
The stability of lateral support bar, add between the ladder that the first lateral support bar and two panels are hinged the stability of internal connection and
Intensity, and then, carried out between the ladder being hinged by the first locking device to the first lateral support bar and ladder main, i.e. two panels
Locking, arbitrarily opens, reduces potential safety hazard in use so as to avoid the first lateral support bar.
And then, the first vertical edge, the first connecting rod and the first lateral support rod triangularity of first ladder,
Firm attachment structure can be formed, the security of ladder is added.Meanwhile, the triangle is changeability, thus, the first lock
Tight device realizes length locking and angle locking, realizes the multifunctionality of locking.
And then, the ladder leg of first ladder of the invention, such as the first vertical edge and/or the second vertical edge can stretch, and
And the locking that can be consolidated after stretching, in such manner, it is possible to adapt to the adjustment of ladder working depth, add the flexible of ladder work
Property.And can stablize and be supported on the working face of injustice, add peace by flexible in uneven workplace, ladder
Overall coefficient.
And then, the flexible use rack or grid of the ladder leg of first ladder of the invention are as locking mode, and one is energy
Enough realize the accurate of continuous and adjustable and adjust repeatedly, extend, can again recall to and, elongation is inadequate, can pull out again a bit, because
And it is easy to adjust, two be the locking compared to existing circular hole bolt-type, rack of the invention or grid type locking, and locking force is more
Greatly, the destruction but to ladder, terraced leg is small, and the stress of terraced leg is all by along ladder or terraced leg length direction, the stretching
When rack or grid that power is acted on terraced leg, the power that rack or grid are born be also along ladder or terraced leg length direction,
This is the optimum orientation that ladder bears tensile force, i.e. ladder stretching is when being locked, and ladder is along bearing tensile strength or pressure resistance
Maximum direction stress is spent, i.e., in the present invention, ladder stretches and is not subject to lateral tensile force, be solely subjected to axial direction or length direction
Tensile force, so, is stretched even across multiple, and ladder of the invention is remained able to bear well normal flexible and propped up
Support, will not as the locking of circular hole bolt-type, circular hole through after a period of time, can the region as stress concentration, and gradually
Rupture, causes ladder to be scrapped.So, ladder of the invention is after flexible, because stress bears axial direction or length direction all the time
Tensile force, it is not easy to damage, still with longer service life.
And then, the present invention is coordinated using voussoir with rack carries out one-way locking, so, along the length side of the first rack
To tight first rack of the first voussoir positive lock realizes quick locking；In addition, first voussoir reversely being capable of edge
First rack to slide, that is, when stretching ladder, Portable power saving.So, it can either ensure that ladder will not be retracted easily, only
There is artificial locking device of opening to release one-way locking, so as to ensure the safety of ladder during work, on the other hand, moreover it is possible to make drawing
When stretching, ladder can Rapid stretching in place, improve operating efficiency, shorten ladder adjustment time.
Brief description of the drawings
Fig. 1 for the present invention family expenses fall ladder main view direction dimensional structure diagram；
Fig. 2 for the present invention family expenses fall ladder rear apparent direction dimensional structure diagram；
Fig. 3 for the present invention family expenses fall ladder side view；
Fig. 4 is the dimensional structure diagram of first angle of the first flexible cleat stanchion of the present invention；
Fig. 5 is the dimensional structure diagram of the first main cleat stanchion of the present invention；
Fig. 6 for the present invention family expenses fall ladder top view；
The structural representation that Fig. 7 is locked for the first flexible cleat stanchion and the first main cleat stanchion of the present invention by cleat stanchion locking device
Figure；
Fig. 8 is the overall structure diagram of the cleat stanchion locking device of the present invention；
Fig. 9 is the decomposition texture schematic diagram of first angle of the cleat stanchion locking device of the present invention；
Figure 10 is the decomposition texture schematic diagram of second angle of the cleat stanchion locking device of the present invention；
Figure 11 is the side structure schematic view of the cleat stanchion locking device of the present invention, wherein, eliminate the first spanner；
Figure 12 is the overlooking the structure diagram of the cleat stanchion locking device of the present invention, wherein, eliminate the first spanner；
The dimensional structure diagram that Figure 13 is connected for the first location division of the present invention with the first spanner；
The main structure diagram that Figure 14 is connected for the first location division of the present invention with the first spanner；
Figure 15 diagrammatically illustrates the stereochemical structure of hinge hinge according to embodiments of the present invention and supporting leg connecting shaft；
Figure 16 diagrammatically illustrates hinge hinge according to embodiments of the present invention and the sectional structure of supporting leg connecting shaft；
Figure 17 is the structural representation of the first locking device of the present invention.
Drawing reference numeral explanation：
11st, first ladder 12, second ladder 13, the first lateral support bar 14, the second lateral support bar 151,
First connecting rod 152, second connecting rod 153, third connecting rod 154, fourth link 111, the first vertical edge 112, the second vertical edge 113
Horizontal edge
The rack 1,130 first of 116 cleat stanchion locking device of the flexible cleat stanchion of 1110 first main cleat stanchions 1,115 first 118 first
Perforate
The first end 1168 of 1161 first location division, 1,162 first spanner, 1,163 second 1,164 first torsion spring of hinge 1167
Second end
The first lug of 117 first 1,170 first overcoat of bearing 1171
2nd, the first locking device 20, the first lock sleeve 21, regulating bolt 22, hinge 23, eccentric cam 24, handle
25th, locking returning spring 201, opening
The pilot hole of 30 hinge hinge, 33 supporting leg axle sleeve, 34 supporting leg, 35 connecting shaft connecting portion, 305 positive stop lug boss 335
333 open slots
40 terminations (handle)
The connecting rod of 123 connecting rod 125
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now control illustrates this hair
It is bright.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 6, ladder includes family expenses of the invention：Two be hinged by hinge hinge 30
Piece ladder, the ladder that two panels is hinged is respectively first ladder 11 and second ladder 12, first ladder 11 and second
Piece ladder 12 is hinged to form double ladder, and the top of first ladder 11 is the termination (handle) 40 of closing, plays a part of handle；
First ladder 11 includes：First vertical edge 111, the second vertical edge 112 and be connected to first vertical edge and
Multiple horizontal edges 113 between second vertical edge, second ladder 12 is, for example, the support for supporting first ladder 11；The
A piece of ladder is climbed provided with horizontal ladder or pedal for people, and second ladder 12 is, for example, the support supported, does not supply people to climb, and plays branch
Support the effect of first ladder；Second ladder 12 has two vertical edges (supporting leg) being supported on working face, two vertical edges
(supporting leg) is connected by the connecting rod 123 laterally set, and connecting rod 123 plays the steady of two vertical edges (supporting leg) of connection and reinforcement
Qualitatively act on, in order to mitigate the overall weight of ladder, it is thinner that connecting rod 123 is done, it is impossible to supports people, it is impossible to for people's climbing；
Certainly, if considered for firm, it is also possible that the comparison that connecting rod 123 is done is thick, can be manned；First ladder 11 and
Connecting rod 125 is additionally provided between two ladders 12, connecting rod 125 is hinged between first ladder 11 and second ladder 12, played
Control the effect of two panels ladder open angle；
Ladder also includes the family expenses：It is arranged on the first lateral support bar 13 of the side of two panels ladder first and sets
The second lateral support bar 14 in the side of two panels ladder second；The first lateral support bar and the second lateral support bar difference
It is hinged on by articulated structure on the hinge hinge 30；First lateral support bar 13 is located at first ladder 11 and second ladder
Outside the rectangular parallelepiped space of the formation of son 12 or trapezoidal shape space, the second lateral support bar 14 also is located at first ladder 11 and second
Outside the rectangular parallelepiped space of the formation of piece ladder 12 or trapezoidal shape space；
As shown in Figure 15 and Figure 16, the articulated structure includes：The branch being set on the hinge hinge 30 that can be rotated
Support leg axle sleeve 33 and the supporting leg connecting shaft 34 radially across the supporting leg axle sleeve 33, the axis of the supporting leg connecting shaft 34
It is consistent with the axis of hinge hinge 30, but the axis of the vertical supporting leg axle sleeve 33 of axis of the supporting leg connecting shaft 34,
The first lateral support bar or the second lateral support bar are hinged on supporting leg axle sleeve 33 by supporting leg connecting shaft 34,
The first lateral support bar or the second lateral support bar are hinged on the hinge hinge by the supporting leg axle sleeve 33
On 30.It is, the articulated structure of the present invention is different from original two-opening type hinge, articulated structure of the invention realizes hinge
Three open so that the axis of the vertical supporting leg axle sleeve 33 of the axis of supporting leg connecting shaft 34, there occurs the change of rotation direction
Change, be that supporting leg is hinged on the lateral there is provided structure guarantee of two-opening type ladder.Supporting leg axle sleeve 33 can be circular sleeve,
It can be cuboid sleeve.
Further, as shown in Figure 15 and Figure 16, the end of the hinge hinge 30 is provided with positive stop lug boss 305, the axle
One end of set 33 is provided with pilot hole 335, and the axle sleeve 33 is set on the hinge hinge 30 by pilot hole 335, and institute
The radial dimension for stating positive stop lug boss 305 is more than the aperture of pilot hole 335, blocks the axle sleeve 33 and is slided from the end of hinge hinge 30
Go out.Open slot 333 is offered on the axle sleeve 33, the supporting leg connecting shaft 34 passes perpendicularly through the opening of open slot 333, described
The top of supporting leg is provided with the connecting portion 35 being hinged with the supporting leg connecting shaft, and the connecting portion 35 can be 34 turns around connecting shaft
It is dynamic, it is arranged in the open slot 33.
Two support bars are respectively supported at the both sides of double ladder, can prevent ladder from toppling over to either side, ensure people
The safety of member's operation.In addition, they sup-port is on the hinge hinge of ladder, the position of support has reached the sustainable of ladder
Extreme higher position, in terms of the overall amechanical angle of ladder, the support of whole ladder is stablized the most, it is not easy to sideways.
And then, support bar and two panels ladder of the invention is the gemel connection by multi-direction opening, and each support bar can
To be rotated freely in the hemi-sphere range of every side, both can around hinge hinge beating according to first ladder and second ladder
Evolution to rotation, can also vertical first ladder and second ladder opening direction rotation, can also up and down all around with
Various Arbitrary Rotations, so, during deploying or packing up support bar, pass through the rotation of different directions and different angles
Turn, the work on the spot environment of complexity can be avoided, the barrier of the various barriers or diverse location in narrow space is got around, it is real
That now deploys or pack up is quick and easy.
And then, the present invention is by the way of a support bar is set per side so that lateral supporting plane is triangle,
The stabilization of ladder is added to greatest extent.
Further, as shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 6, the family expenses, which do not fall ladder, also to be included：
First connecting rod 151, is movably connected between the lateral support bar 13 of first ladder 11 and first；For example, the
One connecting rod 151 is slidable to be connected between the lateral support bar 13 of first ladder 11 and first；
Second connecting rod 152, is movably connected between the lateral support bar 13 of second ladder 12 and first；For example, the
Two connecting rods 152 are slidable to be connected between the lateral support bar 13 of second ladder 12 and first；
The first locking device 2 of the first connecting rod and second connecting rod is locked, the first connecting rod and second connecting rod is connected；
First connecting rod or second connecting rod can share a locking device locking；
First locking device 2 is arranged on the first lateral support bar.First lateral support bar and ladder main,
Connected respectively by first connecting rod and second connecting rod between the ladder that i.e. two panels is hinged, so, add the first lateral support bar
Stability, add the stability and intensity of internal connection between the ladder that the first lateral support bar and two panels are hinged, and then,
Locked between the ladder being hinged by the first locking device to the first lateral support bar and ladder main, i.e. two panels, so that
Avoid the first lateral support bar arbitrarily to open in use, reduce potential safety hazard.Similarly, the second lateral support bar 14 passes through
Third connecting rod 153 and fourth link 154 are flexibly connected two panels ladder, accomplish symmetrical, have a safety feature；
Further, the first connecting rod 151 has two ends, and the respectively first end (upper end) of first connecting rod and first connects
The second end (lower end) of bar, the first end of the first connecting rod is fixedly connected on first ladder 11, first connecting rod
Second end is slidable to be connected on the first lateral support bar；The second connecting rod 12 has two ends, and respectively second connects
The first end (upper end) of bar and the second end (lower end) of first connecting rod, the first end of the second connecting rod are fixedly connected on described
On two ladders, the second end of second connecting rod is slidable to be connected on the first lateral support bar；The first locking dress
Put 2 it is slidable be arranged on the first lateral support bar 13, first locking device 2 connects the first connecting rod 151 simultaneously
With second connecting rod 152.
Only slidable first locking device 2 need to be set on the first lateral support bar 13, you can avoid first
The chute or track for rod slide are opened up on piece ladder and second ladder, manufacture and the link installed, Er Qieneng is reduced
Enough by the operation on the first lateral support bar to the first locking device, while controlling first connecting rod and second connecting rod, accomplish
Kill two birds with one stone, accomplish quick control and lock.
Further, as shown in figure 17, first locking device includes：
First lock sleeve 20, elastic can be set on the first lateral support bar 13, can be with the first lock sleeve 20
The rotating shaft being connected with first connecting rod, and the rotating shaft connected with second connecting rod are set respectively, and first connecting rod and second connecting rod can
Relative to the independent rotation of the first lock sleeve 20；First lock sleeve is the annular with opening 201, for example, with opening 201
Rectangle annular, the first lock sleeve 20 can be provided with lug on the outer wall of the offside of opening 201, for setting respectively and the
The rotating shaft of one connecting rod connection, and the rotating shaft connected with second connecting rod；
First lock sleeve has the first lock sleeve first end and first the second end of lock sleeve；The opening 201 is set
Between the first lock sleeve first end and first the second end of lock sleeve；When the opening 201 of the first lock sleeve 20 is loosened, the
There is space, the first lock sleeve 20 can be described first between the outer wall of the inwall of one lock sleeve 20 and the first lateral support bar 13
Slided on lateral support bar 13；When the opening of the first lock sleeve 20 is tightened up, the inwall of the first lock sleeve 20 and the first lateral branch
Space between the outer wall of strut 13 eliminates or reduced, the outer wall phase of the inwall of the first lock sleeve 20 and the first lateral support bar 13
Laminating is pushed against, and the two forms static friction so that the first lock sleeve 20 is fixed on the first lateral support bar 13, forms lock
Tightly；
The regulating bolt 21 of control 201 sizes of the opening, through the opening 201, and is connected to first lock
Between 20 first ends of tight set and first the second end of lock sleeve；The vertical described first lateral branch of the length direction of the regulating bolt 21
The length direction of strut 13；The head end of the regulating bolt is nut, and the tail end of the regulating bolt is screw rod end；
The hinge 22 of locking device, is arranged on the tail end of the regulating bolt 21, and the length direction of the hinge 22 is vertical
The length direction of the length direction of the regulating bolt and the parallel first lateral support bar 13；
Eccentric cam 23, be hinged on the hinge 22 of the locking device and eccentric cam 23 outer rim be pressed on it is described
On the lateral surface at first the second end of lock sleeve；
Handle 24, connects the eccentric cam 23；
Returning spring 25 is locked, is set in the regulating bolt 22 and positioned at the first lock sleeve first end and the
Between one the second end of lock sleeve.
Handle 24 is pulled with hand, drives eccentric cam 23 to be rotated around hinge 22, during eccentric cam 23 is rotated, is driven
The advance and retreat of regulating bolt 21, so that the size of opening 201 is have adjusted, thus, when the opening of the first lock sleeve 20 is tightened up, first
Space between the outer wall of the inwall of lock sleeve 20 and the first lateral support bar 13 eliminates or reduced, the inwall of the first lock sleeve 20
Fit or push against with the outer wall of the first lateral support bar 13, the two forms static friction so that the first lock sleeve 20 is fixed on institute
State on the first lateral support bar 13, form the locking of each connecting rod.Returning spring 25, for example, compression spring are locked, automatic return is played
Multiple effect, in favor of auto lock.By the first locking device with cam, bolt and spring reset structure, it can realize
Quick adjustment, rapid translating, locking is firm, and the effect of auto lock adds security.
Further, first locking device 2 is located at the lower section of the first end of the first connecting rod 151, and is located at
The lower section of the first end of the second connecting rod 152.So, after staff descends on a ladder, it can be achieved on the ground
Locking is unlocked, it is not necessary to which it is to lock or unlock to climb to ladder again, it is ensured that the firm and safety of ladder before upper ladder, it is ensured that under
The convenience that ladder is packed up after ladder.
Further, as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 7, first vertical edge 111 includes：Cut with scissors with the hinge hinge 30
The first main cleat stanchion 1110 for connecing, the lower section for being arranged on the described first main cleat stanchion and can relatively described first main cleat stanchion slide first
Flexible cleat stanchion 1115 and cleat stanchion locking device 116, the first main cleat stanchion 1110 is with the first flexible cleat stanchion 1115 by described
The clamping of cleat stanchion locking device 116 is connected.
Further, the first vertical edge 111 and the second vertical edge 112 and the first horizontal edge can for aluminium, aluminium alloy or steel or not
Rust steel is made, and the connection of the first vertical edge 111 and the first horizontal edge can be riveting or welding；The first main cleat stanchion and first stretches
Cleat stanchion is the aluminum or aluminum alloy section bar of rectangle or circle.As one kind selection, the first vertical edge 111 and the second vertical edge 112 can be only
Vertical flexible, second ladder no longer stretches.
Further, the described first main cleat stanchion and first stretches cleat stanchion for rectangular aluminum or aluminium alloy extrusions, as shown in figure 9,
The cleat stanchion locking device includes：First location division 1161 of protrusion, the first main cleat stanchion 1110 or first extension ladder
Post 1115 is provided with the first rack 118 being connected with the clamping of the first location division 1161 or the multiple first grids arranged in strip
Lattice, first rack 118 is provided with multiple parallel teeth, and multiple parallel teeth or multiple first grids are along described the
The length direction arrangement of one main cleat stanchion or the first flexible cleat stanchion.
As shown in Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14, the first location division 1161, for example, fixture block, with tooth
Bar or grid realize that clamping is locked, and the first location division 1161 is with being that linear contact lay or face are contacted between rack or grid, thus rack
Or the lifting surface area of grid is larger, in the case of same material so that the first main cleat stanchion 1110 and first stretches cleat stanchion 1115
Between can bear bigger active force, thus, add the stability of ladder work, especially in the uneven occasion in ground,
In the case of the unbalance stress of every ladder or each terraced leg (such as the first vertical edge 111 or the second vertical edge 112), certain a piece of ladder or
Terraced leg is possible to bear larger heavy burden, if locked using latch or pivot pin or peg type, ladder can then have more than latch or
The danger of pivot pin or pin bearing strength.The first location division 1161 and the clamping of rack or grid that the present invention is used are locked, energy
Enough increase the contact area of clamping, increase the stability of support.
And then, the first rack is provided with multiple equally spaced parallel teeth, multiple equally spaced parallel teeth or many
Length direction of individual equally spaced first grid along the described first main cleat stanchion or the first flexible cleat stanchion is arranged, so, can
To realize flexible accurate and adjust repeatedly, extend, can again recall to and, elongation is inadequate, can pull out a bit again, thus tune
Perfect square is just.Because the first location division 1161 and rack or grid realize that clamping is locked, rack or grid have sufficient width, because
And, the width of the flexible cleat stanchion 1115 of the first main cleat stanchion 1110 or first can be made full use of to bear to bear a heavy burden.Due to taking full advantage of
First main cleat stanchion 1110 or first stretch cleat stanchion 1115 width, under conditions of intensity is met, it is possible to reduce teeth or
The spacing of grid, the spacing of teeth could be arranged to 0.5mm, 1mm, 2mm or 3mm or several millimeter, can meet the step of various adjustment
Enter requirement and required precision, keep the continuity and accuracy of adjustment, can also cause the first vertical edge 111 or the second vertical edge 112 to protect
The synchronism of adjustment is held, it is also possible that in the case of uneven working face, the first vertical edge 111 or the second vertical edge 112 keep adjusting
Whole independence so that the first vertical edge 111 or the asynchronous adjustment of the second vertical edge 112, it is non-interference.
Further, the described first main cleat stanchion 1110 is set in outside the described first flexible cleat stanchion 1115, the first main cleat stanchion
1110 vertical connections or the horizontal ladder of lateral connection, the connection of the flexible cleat stanchion 1115 of the first main cleat stanchion 1110 and first is the first main cleat stanchion
The connection of 1110 length directions, the connection in the two directions be it is separate, so so that the first main cleat stanchion 1110 can be with
Horizontal ladder keeps stable and is fixedly connected, and can keep the flexible of relative first flexible cleat stanchion 1115.
As shown in Figure 4, Figure 5, the described first flexible cleat stanchion 1115 is provided with first rack 118, the first main ladder
Post 1110 is stretched provided with the first perforate 1130 that first location division 1161 is passed in and out, i.e., the first main cleat stanchion 1110 is accommodated with first
The facing face of contracting cleat stanchion 1115 is provided with the first perforate 1130, so that the first location division 1161 is passed in and out, and realizes locking.
The present invention is with the first main cleat stanchion 1110 and horizontal terraced lateral connection, with the first flexible cleat stanchion 1115 in the first main cleat stanchion
Move and locked in 1110, realize the vertical connection of telescopic direction, thus, reasonably it is assigned with the flexible division of labor of terraced leg.
Further, as shown in Figure 1, Figure 2 and Figure 3, the structure of second vertical edge is identical with the structure of first vertical edge, and described
Two ladders are identical with the structure of first ladder, i.e., four legs (four vertical edges) of two panels ladder can independent telescope tune
It is whole, moreover, second ladder can be climbed with first ladder, it can also support.First main cleat stanchion 1110 and first is stretched
Contracting cleat stanchion 1115 can be with identical, and for example, metal material such as aluminium, aluminium alloy, steel, stainless steel is made, be easy to teeth or grid plus
Work.
Further, as shown in Fig. 8, Fig. 9, Figure 11, Figure 12, Figure 13 and Figure 14, the cleat stanchion locking device 116 is also wrapped
Include：The first spanner 1162 for being connected with first location division 1161, the second hinge 1163 being connected with first spanner, with
And the first torsion spring 1164 on second hinge 1163 is set in, wherein, first spanner has first end 1167 and
Two ends 1168, the line at the end 1168 of first end 1167 and second is the length direction of first spanner 1162, described the
Two ends 1168 connect first location division 1161, and the first end 1167 is press-side, the vertical institute of second hinge 1163
State the line of first end and the second end and be located between the first end and the second end.Second hinge 1163 has the work of fulcrum
With so that the end 1168 of first end 1167 and second and the second hinge 1,163 one lever of formation, the end of first end 1167 and second
1168 rotate around the second hinge 1163 in stress.First spanner 1162, the second hinge 1163 and the first location division 1161
Material can with identical, such as the first location division 1161 material by aluminium, aluminium alloy, metal material be made, be easy to processing, also may be used
It is wear-resisting to use steel, especially stainless steel to be made, long lifespan.
The present invention is set to：In its natural state, i.e., in the state of not being pressed, due to the effect of the first torsion spring 1164,
First end 1167 is raised to maximum height, and the second end 1168 is then located at minimum point, and the first location division 1161 extend into first and opened
In hole 1130, clamping rack or grid；When needing adjustment, first end 1167 is pressed, the second end 1168 is then lifted, the first positioning
Portion 1161 departs from from the first perforate 1130 therewith, then without beam between the flexible cleat stanchion 1115 of the first main cleat stanchion 1110 and first
Tie up, the first flexible cleat stanchion 1115 can then be slided with respect to the first main cleat stanchion 1110, be realized flexible.After stretching to specified location,
The pressing to first end 1167 is unclamped, then the first location division 1161 is returned to locking state in the presence of the first torsion spring 1164,
It extend into the first perforate 1130.The present invention is not to press first end 1167 or not apply stressed state to first end 1167
For default conditions, the state is locking state or is one-way locking state, this way it is ensured that in the condition not exerted a force manually
Under, ladder is one-way locking, can stretch but can not shrink, so as to ensure that the security of ladder, prevent maloperation.Only
When meeting the subjective intention that needs shrink, just cause one-way locking states thereof, realize and shrink.
Further, the cleat stanchion locking device also includes：It is set in the first bearing on the described first main cleat stanchion 1110
117, the hinge 1163 of the first spanner 1162 and second is arranged on first bearing 117, so, is easy to cleat stanchion to lock
The fabrication and installation of device, are easy to keep the consistent and complete of the first main processing of cleat stanchion 1110.
Further, first bearing 117 includes：Set at the top of first overcoat 1170 of tubular, first overcoat
Have and be additionally provided with two first lugs 1171 at the top of the second perforate for accommodating the first location division turnover, first overcoat,
Second perforate is located between described two first lugs 1171, and two first lugs 1171 are along first overcoat 1170
Length direction extension, be respectively equipped with the mounting hole for installing second hinge 1163 in each first lug 1171, described the
Two hinges 1163 are arranged on the mounting hole of two first lugs, and vertical first overcoat of second hinge 1163
1170 length direction.
Further, the described first main cleat stanchion and/or the first flexible cleat stanchion include the first section bar of rectangle, are, for example,
Aluminium section bar or aluminium alloy extrusions or steel profile, so, are provided with after the opening for locking on rectangle section bar, are maintained to
Enough intensity.First overcoat 1170 of the tubular is the tubular of cuboid, is stretched with the first main cleat stanchion and/or described first
The shape of contracting cleat stanchion is corresponding.Second perforate be rectangle opening, first location division 1161 be the first voussoir or fixture block,
First voussoir passes in and out direction in vertical first voussoir and is projected as rectangle, and first voussoir has and rack or grid clamping
Acute angle b, the first rack has the teeth being meshed with the acute angle b of straight first voussoir.
Each teeth on first rack are, for example, straight-tooth, i.e., each teeth (crown) are formed in the first flexible cleat stanchion upslide shadow
Parallel a plurality of straight line, the length direction of each teeth is the length direction of the vertical first flexible cleat stanchion, i.e., the extension side of each teeth
To the width for the first flexible cleat stanchion so that the first voussoir is straight line with the contact or clamping of the teeth on the first rack
(or rectangle plane) is contacted or clamping.Grid can also be that straight line (or rectangle plane) connects by the contact or clamping with the first voussoir
Touch or clamping, grid is set to rectangular grid, also, rectangular grid and the frame of contact or the clamping of the first voussoir are vertical the
The length direction of one flexible cleat stanchion.So, to obtain, locking force is bigger, the smaller effect of the destruction to ladder, terraced leg.
Compared to the locking of existing circular hole bolt-type, rack of the invention or grid type locking, locking force are bigger, still
Destruction to ladder, terraced leg is smaller, and the stress of terraced leg is all by along ladder or terraced leg length direction, the tensile force effect
When rack or grid on terraced leg, the power that rack or grid are born is also that, along ladder or terraced leg length direction, this is ladder
Son bears the optimum orientation of tensile force, i.e., when ladder stretching is locked, and ladder is along bearing tensile strength or compression strength is maximum
Direction stress, i.e., the present invention in, ladder stretching be not subject to lateral tensile force, be solely subjected to the stretching of axial direction or length direction
Power, so, is stretched even across multiple, and ladder of the invention is remained able to bear well normal flexible and supported, no
Can be as the locking of circular hole bolt-type, circular hole gradually ruptures through that after a period of time, can turn into the region of stress concentration,
Ladder is caused to be scrapped.So, ladder of the invention is after flexible, because stress bears the stretching of axial direction or length direction all the time
Power, it is not easy to damage, still with longer service life.
Wherein, one-way locking refers to following two states：
A：When not pressing first end 1167, along on the length direction of the first rack, the first voussoir positive lock is tight
First rack, when forward direction is directed to recovery the first flexible cleat stanchion of contracting, the first voussoir locks first rack, i.e., do not pressing
When pressing first end 1167, the first flexible cleat stanchion can not shrink；Because the first voussoir has the acute angle b with rack or grid clamping,
Unidirectional i.e. positive locking can thus be realized.
B:First voussoir can reversely be slided along first rack, reversely refer to be pulled outwardly the first flexible cleat stanchion
When, the first flexible cleat stanchion is not acted on then by locking, without pressing first end 1167, also can quickly be pulled out.In addition, the first voussoir
The acute angle b for being all during with rack or grid clamping, thus, when the first voussoir is reversely moved along rack or grid, first wedge
Angle between block and rack or grid is then obtuse angle (180-b), the first voussoir be on multiple steps of rack or grid not
By the movement of snap action power, only by frictional force, it will not be locked, so during stretching ladder, Portable power saving.Due to normal condition
Under, ladder is by the effect of ground supports condition and acting on for gravity, and ladder support receives the support force on ground behind ground, because
And can not active drawing, in such manner, it is possible to ensure that ladder will not be retracted easily, and will not be drawn under default conditions stability under loading
Stretch, so that ensure the safety of ladder during work, on the other hand, moreover it is possible to which when making ladder need to be stretched, ladder can be pulled out quickly,
Operating efficiency is improved, the time of ladder adjustment is shortened.
Further, second perforate is connected and overlapped with first perforate 1130, i.e., the first main He of cleat stanchion 1110
The first overcoat 1170 thereon is set in same position upper shed, to ensure that the first location division can be continuously in the first main ladder
Passed in and out in the overcoat 1170 of post 1110 and first.
Further, the first lateral support bar includes：The second main cleat stanchion for being connected with two panels ladder, be arranged on it is described
The lower section of second main cleat stanchion and can relatively described second main cleat stanchion the second flexible cleat stanchion and support rod locking device that slide,
The second main cleat stanchion is with the second flexible cleat stanchion by supporting rod locking device clamping to be connected.It is, the first lateral support bar
Top be provided with the first locking device 2, open amplitude for locking support bar angle；The lower section of first lateral support bar is provided with
Rod locking device is supported, for the flexible of locking support bar；First lateral support bar is realized not provided with two kinds of locking devices
Same locking needs, and takes full advantage of space.
Further, the described second main cleat stanchion and second stretches cleat stanchion for rectangle or circle, the support rod locking device
For alignment pin, the pin-and-hole inserted for alignment pin is respectively equipped with the second main cleat stanchion and the second flexible cleat stanchion, the second main cleat stanchion with
After pin-and-hole alignment on second flexible cleat stanchion, alignment pin is inserted, that is, realizes locking.Double ladder is so mainly in view of in family expenses ring
In border, lateral support bar mainly plays security protection, and the power born is smaller, is realized using circular pin and circular alignment pin
Locking, being generally capable of the support of double ladder needs.Two kinds of locking devices on first lateral support bar, function and structure
It is different, play the space multistory advantage of lateral support bar so that lateral support bar not only there is lateral support to play peace
The effect of full guard, moreover it is possible to accomplish to lock the effect of opening angle and collapsing length respectively.
Schematical embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.For this
Each part of invention can be mutually combined under conditions of not conflicting, any those skilled in the art, not depart from this
Made equivalent variations and modification, all should belong to the scope of protection of the invention on the premise of the design of invention and principle.
Claims (10)
1. a kind of family expenses do not fall terraced, it is characterised in that ladder includes the family expenses：The two panels ladder being hinged by hinge hinge
Son, the ladder that two panels is hinged is respectively first ladder and second ladder, and first ladder and second ladder are hinged
Double ladder is formed, first ladder includes：First vertical edge, the second vertical edge and it is connected to first vertical edge and second
Multiple horizontal edges between vertical edge, second ladder is the support for supporting first ladder；
Ladder also includes the family expenses：It is arranged on the first lateral support bar of the side of two panels ladder first and is arranged on two panels
Second lateral support bar of the side of ladder second；The first lateral support bar and the second lateral support bar are respectively by being hinged
Structure is hinged on the hinge hinge；
The articulated structure includes：Can rotate the supporting leg axle sleeve being set on the hinge hinge and radially across the branch
The supporting leg connecting shaft of support leg axle sleeve, the axis of the vertical supporting leg axle sleeve of the axis of the supporting leg connecting shaft, described the
One lateral support bar or the second lateral support bar are hinged on supporting leg axle sleeve by supporting leg connecting shaft, and described
One lateral support bar or the second lateral support bar are hinged on the hinge hinge by the supporting leg axle sleeve.
2. family expenses as claimed in claim 1 do not fall terraced, it is characterised in that first vertical edge includes：With the hinge hinge
The first main cleat stanchion for being hinged, the lower section for being arranged on the described first main cleat stanchion and can first stretching of sliding of relatively described first main cleat stanchion
Contracting cleat stanchion and cleat stanchion locking device, the first main cleat stanchion and the first flexible cleat stanchion pass through the cleat stanchion locking device clamping
Connection.
3. family expenses as claimed in claim 2 do not fall terraced, it is characterised in that the cleat stanchion locking device includes：The first of protrusion
Location division, the first main cleat stanchion or the first flexible cleat stanchion are provided with the first tooth being connected with first location division clamping
Bar or multiple first grids arranged in strip, first rack are provided with multiple parallel teeth, multiple parallel teeth
Or length direction of multiple first grids along the described first main cleat stanchion or the first flexible cleat stanchion is arranged.
4. family expenses as claimed in claim 2 do not fall terraced, it is characterised in that the first main cleat stanchion and first stretches cleat stanchion for square
Shape or circle.
5. family expenses as claimed in claim 1 do not fall terraced, it is characterised in that the first lateral support bar includes：With two panels ladder
Second main cleat stanchion of son connection, the lower section for being arranged on the described second main cleat stanchion and can relatively described second main cleat stanchion slip second
Flexible cleat stanchion and support rod locking device, the second main cleat stanchion and the second flexible cleat stanchion are by supporting rod locking device card
Connect in succession.
6. family expenses as claimed in claim 5 do not fall terraced, it is characterised in that the second main cleat stanchion and second stretches cleat stanchion for square
Shape or circle, the support rod locking device are alignment pin.
7. family expenses as claimed in claim 1 do not fall terraced, it is characterised in that ladder also includes the family expenses：
First connecting rod, is movably connected between first ladder and the first lateral support bar；
Second connecting rod, is movably connected between second ladder and the first lateral support bar；
The first locking device of the first connecting rod and second connecting rod is locked, the first connecting rod and second connecting rod is connected；
First locking device is arranged on the first lateral support bar.
8. family expenses as claimed in claim 1 do not fall terraced, it is characterised in that the end of the hinge hinge is provided with positive stop lug boss,
One end of the axle sleeve is provided with pilot hole, and the axle sleeve is set on the hinge hinge by pilot hole, and described spacing
The radial dimension of boss is more than the aperture of pilot hole, and the other end of the axle sleeve offers open slot, the supporting leg connecting shaft
The opening of open slot is passed perpendicularly through, the top of the supporting leg is provided with the connecting portion being hinged with the supporting leg connecting shaft, described
Connecting portion can be rotatably arranged in the open slot.
9. family expenses as claimed in claim 7 do not fall terraced, it is characterised in that the first connecting rod has two ends, respectively first
The first end of connecting rod and the second end of first connecting rod, the first end of the first connecting rod are fixedly connected on first ladder
On, the second end of first connecting rod is slidable to be connected on the first lateral support bar；The second connecting rod has two ends, point
Not Wei second connecting rod first end and the second end of first connecting rod, the first end of the second connecting rod is fixedly connected on described second
On piece ladder, the second end of second connecting rod is slidable to be connected on the first lateral support bar；First locking device
Slidable to be arranged on the first lateral support bar, first locking device connects the first connecting rod and second and connected simultaneously
Bar.
10. family expenses as claimed in claim 9 do not fall terraced, it is characterised in that first locking device includes：
First lock sleeve, is set on the first lateral support bar, and first lock sleeve is the annular with opening, described
First lock sleeve has the first lock sleeve first end and first the second end of lock sleeve；The opening is arranged on first lock sleeve
Between first end and first the second end of lock sleeve；
Control the regulating bolt of the openings of sizes, through the opening, and be connected to the first lock sleeve first end and
Between first the second end of lock sleeve；The length direction of the vertical first lateral support bar of the length direction of the regulating bolt；
The head end of the regulating bolt is nut, and the tail end of the regulating bolt is screw rod end；
The hinge of locking device, is arranged on the tail end of the regulating bolt, the vertical regulation spiral shell of length direction of the hinge
The length direction of the length direction of bolt and the parallel first lateral support bar；
Eccentric cam, is hinged on the hinge of the locking device and the outer rim of eccentric cam is pressed on first lock sleeve
On the lateral surface at the second end；
Handle, connects the eccentric cam；
Returning spring is locked, is set in the regulating bolt and positioned at the first lock sleeve first end and the first lock sleeve
Between second end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710418943.XA CN107201875A (en) | 2017-06-06 | 2017-06-06 | Family expenses do not fall terraced |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710418943.XA CN107201875A (en) | 2017-06-06 | 2017-06-06 | Family expenses do not fall terraced |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107201875A true CN107201875A (en) | 2017-09-26 |
Family
ID=59906958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710418943.XA Withdrawn CN107201875A (en) | 2017-06-06 | 2017-06-06 | Family expenses do not fall terraced |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107201875A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018130167A1 (en) * | 2017-01-15 | 2018-07-19 | 黄崇华 | Stepladder |
| CN110344749A (en) * | 2019-07-25 | 2019-10-18 | 浦江概念五金科技有限公司 | Portable domestic folding ladder |
| CN110847802A (en) * | 2019-02-22 | 2020-02-28 | 崇华科技永康有限公司 | Five-connecting-rod hinge connecting structure for ladder |
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| US4641729A (en) * | 1985-10-31 | 1987-02-10 | Beck Andrew C | Method and apparatus for stabilizing a ladder |
| US6094757A (en) * | 1999-03-29 | 2000-08-01 | Tomkins Industries, Inc. | Threshold assembly for barrier free shower units |
| CN2752419Y (en) * | 2004-11-30 | 2006-01-18 | 谢小燕 | Mental ladder expansion foot locking and adjusting mechanism |
| CN202970421U (en) * | 2012-10-24 | 2013-06-05 | 深圳广田装饰集团股份有限公司 | Height-variable herringbone ladder |
| CN106593286A (en) * | 2017-01-23 | 2017-04-26 | 黄崇华 | Folding ladder |
| CN206785287U (en) * | 2017-06-06 | 2017-12-22 | 黄崇华 | Family expenses do not fall terraced |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4641729A (en) * | 1985-10-31 | 1987-02-10 | Beck Andrew C | Method and apparatus for stabilizing a ladder |
| US6094757A (en) * | 1999-03-29 | 2000-08-01 | Tomkins Industries, Inc. | Threshold assembly for barrier free shower units |
| CN2752419Y (en) * | 2004-11-30 | 2006-01-18 | 谢小燕 | Mental ladder expansion foot locking and adjusting mechanism |
| CN202970421U (en) * | 2012-10-24 | 2013-06-05 | 深圳广田装饰集团股份有限公司 | Height-variable herringbone ladder |
| CN106593286A (en) * | 2017-01-23 | 2017-04-26 | 黄崇华 | Folding ladder |
| CN206785287U (en) * | 2017-06-06 | 2017-12-22 | 黄崇华 | Family expenses do not fall terraced |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018130167A1 (en) * | 2017-01-15 | 2018-07-19 | 黄崇华 | Stepladder |
| CN110847802A (en) * | 2019-02-22 | 2020-02-28 | 崇华科技永康有限公司 | Five-connecting-rod hinge connecting structure for ladder |
| CN110344749A (en) * | 2019-07-25 | 2019-10-18 | 浦江概念五金科技有限公司 | Portable domestic folding ladder |
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Application publication date: 20170926 |