CN108026755A - Extension ladder component - Google Patents
Extension ladder component Download PDFInfo
- Publication number
- CN108026755A CN108026755A CN201680056211.4A CN201680056211A CN108026755A CN 108026755 A CN108026755 A CN 108026755A CN 201680056211 A CN201680056211 A CN 201680056211A CN 108026755 A CN108026755 A CN 108026755A
- Authority
- CN
- China
- Prior art keywords
- terraced
- side frame
- ladder
- contracting
- tubular side
- 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
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
- E06C1/125—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic with tubular longitudinal members nested within each other
Abstract
The present invention relates to a kind of telescopically deployable and the terraced component of contracting can be covered, have bottom ladder part, top ladder part and it is one or more among terraced part.Top ladder part and it is one or more of among ladder part be the terraced part that can cover contracting, its is multiple to be provided with air damper, in the bottom end of tubular side frame component that can cover the terraced part of contracting.Air damper includes barrier structure, it limits one or more throttling opening, valve member and actuator members.During it can cover the set contracting of contracting ladder part, valve member is pushed into throttle position by actuator member, can cover contracting ladder the partially unfolded period, valve member is pushed into un-throttled position.
Description
Technical field
The present invention relates to one kind, telescopically (telescopic) is deployable and can cover the terraced component of contracting, it is with bottom ladder portion
Divide, ladder part among top ladder part and one or more, wherein, each ladder partly includes two tubular side frame (stile) structures
Part, each have bottom end and a top ends, which is arranged as parallel to each other, and passes through at top ends
Terraced crosspiece interconnection, to form U-shaped ladder part, and wherein, the tubular side frame component of bottom ladder part is horizontal by bottom ladder in addition
Shelves connection.
Background technology
Top ladder part and one or more of middle ladder parts are the terraced parts that can cover contracting, each with tubular side frame
The bottom end of component, it is telescopically inserted into the top ends of the tubular side frame component of adjacent terraced part, to allow to cover
The ladder part of contracting is condensed in set puts between expanded position relative to the movement of adjacent ladder part.
Terraced component further includes automatic lock-latching mechanism, for when can cover contracting ladder part in expanded position when, by flexible insertion
The side frame members of the terraced part for covering contracting locked relative to adjacent ladder part, bolt lock mechanism with for unlocking the rush of side frame members
Dynamic device is associated, to allow the set of terraced component to contract.These terraced components as can portable ladder become very popular, such as directly
Extension ladder, step, " terraced product " in addition, such as assembly, have scalariform Retractive leg workbench, etc..Existing skill
Art design has unsatisfactory details on their construction and/or their actual use.
Exist for example, extension ladder component is likely encountered one or more ladder parts when the ladder part of vertical ladder or step declines
During set contracting the problem of undesirable translational speed during exercise.It is known in the state of the art to be covered for the multiple of extension ladder component
The ladder part of contracting sets damping member, the retardance of speed caused by the gravity for the terraced part that the damping member offer can cover contracting.
Such ladder component is for example from known to document US5743355 and EP 2 770 155.
In US5743355, propose to set air damper at the bottom end of tubular side frame component, the air resistance
When Buddhist nun's device is based on ladder set contracting, air must flow through the hole in air damper to provide retardance.This method has been considered to
It is unpractiaca.Especially, when the contracting of terraced quilt cover and ladder are unfolded, damper is active, and the undesirable shifting of terraced part
It is a problem during terraced assembly set contracts or is unfolded that dynamic speed, which is generally only, depending on terraced type.
In EP 2 770 155, propose to provide the air damper for including sealing ring, the sealing ring in set to by contracting
The air stream of annular opening between the tubular side frame component being telescopically connected of terraced part throttles.These air dampers exist
It is active during the set contracting of ladder, but when ladder is unfolded, it is allowed to less limited air stream.The program also has been considered to
It is unpractiaca.Especially, the such abrasion of such as dust granules and small grid and foreign body can hinder the correct fortune of sealing ring
OK, the reliability of damper and is thus negatively influenced.The present invention relates to the gravity of one or more parts of extension ladder component
The retardance problem of caused speed, and purpose is to provide terraced component that is a kind of telescopically deployable and can covering contracting, it, which has, improves
Air damper.
The content of the invention
According to the present invention, which is provided by extension ladder component according to claim 1.
Terraced component that is telescopically deployable according to the present invention and can covering contracting has bottom ladder part, top ladder part and one
Terraced part among a or multiple.
Each ladder part includes two tubular side frame components, each has bottom end and top ends, the tubular side frame
Component is arranged as parallel to each other, and is interconnected at top ends by terraced crosspiece, to form U-shaped ladder part.Bottom ladder part
Tubular side frame component is connected by bottom ladder crosspiece in addition.
Top ladder part and one or more of middle ladder parts are the terraced parts that can cover contracting, each with tubular side frame
The bottom end of component, the bottom end are telescopically inserted into the top ends of the tubular side frame component of adjacent terraced part,
Put with allowing the ladder part that can cover contracting to condense in set between expanded position relative to adjacent terraced partly mobile.
Terraced component further includes automatic lock-latching mechanism, for when can cover contracting ladder part in expanded position when, by flexible insertion
The tubular side frame component of the terraced part for covering contracting locked relative to adjacent ladder part, bolt lock mechanism with for unlocking tubular side frame
The actuator of component is associated, to allow the set of terraced component to contract.
Automatic lock-latching mechanism for extension ladder is considered being commonly known in the prior art, and therefore no longer herein
Explain in detail.
According to the present invention, multiple ladder parts that can cover contracting are provided with air damper, they, which are installed on, can cover contracting
In the bottom end of the tubular side frame component of terraced part, the air damper based on cover contract during to the pipe from adjacent terraced part
The air stream that shape side frame members are flowed in the tubular side frame component for the terraced part that can cover contracting throttles, and the set in terraced part contracts
When provide can cover contracting terraced part gravity caused by speed retardance,
According to the present invention, each air damper includes：
Barrier structure, the barrier structure are installed in the bottom end of tubular side frame component, and the barrier structure limits one
A or multiple throttling openings, its allow the tubular side frame component of air from adjacent terraced part flow to damper member is installed can
In the tubular side frame component for covering the terraced part of contracting；
Valve member, the valve member are movably supported relative to barrier structure, so that valve member can be in un-throttled position
Put and moved between throttle position relative to barrier structure, in the un-throttled position, air may flow through it is one or
It is multiple throttling opening, in the throttle position, valve member seal at least in part it is one or more of throttling opening, with to from
The tubular side frame component of adjacent ladder part flow to the tubular side frame of the terraced part installed above that cover contracting for having damper member
Air in component throttles；With
Actuator member, the actuator member is padded including one or more separated grasping and elastic device, and described one
A or multiple pads that grasp each are connected to valve by connector arm, and one or more of pads that grasp each abut against terraced portion
One or more of separated grasp are padded table in backups by the inner surface positioning of the tubular side frame component divided, the elastic device
Face, so that grasp pad forms CONTACT WITH FRICTION with inner surface.During it can cover the ladder part set contracting of contracting, actuator member is by valve member
Throttle position is pushed into, in the terraced the partially unfolded period that can cover contracting, valve member is pushed into un-throttled position by actuator.
Typically, the terraced part of extension ladder component --- more particularly, the tubular side frame structure of the terraced part of extension ladder component
Part --- telescopically connected so that they are scalable into coming out one another and therefrom, and thus allow the set of extension ladder contract and
Expansion.
Top ladder part and one or more of middle ladder parts are the terraced parts that can cover contracting, i.e. all of which and phase
Adjacent ladder part (that is, middle ladder part or bottom ladder part) is telescopically connected, so that their tubular side frame component is telescopically inserted
Enter into the tubular side frame component of adjacent terraced part, the phase between expanded position is put to allow the ladder part that can cover contracting to condense in set
It is mobile for adjacent ladder part.In other words, scalable ladder part is telescopically to receive receiving ladder part (phase i.e., on the lower
Adjacent ladder part) in terraced part.
According to the present invention, ladder part that is multiple, preferably can all covering contracting is provided with air damper, they are installed on can
In the bottom end for covering the tubular side frame component of the terraced part of contracting,
In one embodiment, the only one in two tubular side frame components of terraced part is provided with air in its lower end
Damper.Another tubular side frame component can be sealed for example in its lower end, so that air is passed through from adjacent ladder part on the lower
By single air damper throttling open flow to have the single air damper terraced part.
It should be noted that bottom ladder part need not be provided with air damper.Preferably, the tubular side frame structure of bottom ladder part
Part seals at their bottom end, such as is provided with the body of connector type, it is inserted into tubular side frame component, to carry
For foot/stent, for ladder to be supported on a support surface.
It should be noted that the upper ladder part of relative lightweight only needs minimum damp or feasibly without damping, and can thus not set
It is equipped with damper.When top ladder part is provided with one or two damper member, tubular side frame component is preferably set up
There are one or more openings, it allows the air when ladder is the partially unfolded to be flow to from the external world in tubular side frame component.
It is single channel air damper by air damper provided by the invention.Can when be already installed with damper above
When the ladder part of set contracting moves along the first direction, which is active, i.e. throttle to air stream, when
The ladder part of contracting can be covered when moving in a second direction, air damper is changed into sluggish, i.e. does not throttle to air stream.
Air damper each includes barrier structure, it limits one or more throttling openings.One or more of sections
Stream opening allow the tubular side frame component of air from adjacent terraced part flow to above be already installed with the tubulose side of air damper
In frame member, and vice versa.
Air damper is configured such that, the relative movement of the tubular side frame component for the terraced part being telescopically connected is by valve structure
Part contracts or is unfolded into and out throttle position, this ladder part set for depending on covering contracting.
When the ladder part that can cover contracting is unfolded, the valve member of its air damper is moved into un-throttled position, and described one
A or multiple throttling openings allow the tubular side frame component of the terraced part of air progressive development, and flow into the pipe of adjacent terraced part
Shape side frame members.The air stream contributes to the expansion of terraced part.
When that can cover the ladder part set contracting of contracting, the valve member of its air damper is moved into throttle position, and at least partly
Ground sealing throttling opening.Thus, saved from adjacent ladder part by the open flow that throttles to the air stream in the terraced part of set contracting
Stream.The reduction of the air stream is so that cover the tubular side frame component of the terraced part of contracting into the tubular side frame component of adjacent terraced part
Movement slows down, and thus in terraced part set contracting speed caused by the gravity for the terraced part that offer can cover contracting retardance.
In an embodiment according to the present invention, valve member is provided with one or more flow-through openings, when valve member is in non-
During throttle position, the flow-through opening is overlapped with the one or more of throttling openings limited by barrier structure.When valve structure
When part is had been moved into throttle position, these one or more flow-through openings no longer or are only partially overlapped with throttling opening.
For valve member be provided with a flow-through opening (its when valve member is in un-throttled position with throttling register) allow it is accurate
Ground limit valve member throttling behavior in a preferred embodiment, it is one or more of throttling opening and thus valve member can
Select flow-through opening to extend in a radial direction (if present), that is, be configured such that, flow through their air along footpath
Flowed to direction, i.e. perpendicular to the central axial line for the tubular side frame component for being already installed with air damper above.It is real replacing
Apply in example, valve member has body, and when valve member is in throttle position, it covers throttling opening, when in un-throttled position
When, do not cover throttling opening.For example, valve body can be connector type body, it is inserted into throttling opening neutralization and therefrom pulls out,
To throttle to air stream.
According to the present invention, the limitation of the outflow of the air from adjacent terraced part is used to provide for covering the terraced part of contracting
The retardance of speed caused by gravity.Quantity, size and the position for the opening escaped by varying permission air from adjacent ladder part,
The damping of air damper can be defined.
It may be noted that when valve member is in throttle position, ring that air can still between the side frame members being telescopically connected
The tubular side frame component of the adjacent terraced part of shape opening outflow.Alternatively, outflow opening may be provided in adjacent terraced part, with into
One step allows air to escape when that can cover the ladder part set contracting of contracting from adjacent ladder part, and thus reduces the retardance of air damper
Effect.In order to be provided to larger total stream of outflow opening (additionally or as replacing) to the tubular side frame of adjacent terraced part
Go out, when throttle body is in throttle position, barrier structure, which may be structured to limit, run through opening, it is described run through opening not by
Valve member covers and/or valve member is designed to only partly cover throttling opening.
By providing outflow opening and/or flowing out the retardance of adjacent ladder part reduction blocker and auxiliary air through opening
Effect.For example, lighter and less top stepped portion --- there is speed caused by less gravity when covering contracting ---
Air damper can be thus equipped with, it has the blockage effect reduced, contracts not extend the set of ladder inadequately.
The one or more of throttling openings limited by barrier structure determine the tubular side frame for entering adjacent terraced part
The maximum air flow of component, i.e. when the terraced the partially unfolded and throttle ele-ment that can cover contracting is moved into un-throttled position, air
It can be opened via the annular opening between side frame members, via running through in the outflow opening in side frame members and/or barrier structure
Mouth (if present) and throttling open flow are into adjacent side frame members.
Thus the size of throttling opening can be used for determining the easness that the ladder part that can cover contracting can be unfolded.
In one embodiment, the side frame members of adjacent terraced part are provided with one or more outflow openings, it is along side frame structure
The length positioned at intervals of part, thus the bottom of the terraced part of set contracting with air damper during the set contracting of terraced part along this
A little one or more outflow opening movements.Thus, terraced component is provided with staged damped trajectory, and the ladder of damped trajectory outflows
Opening separates.
For example, by being provided with for tubular side frame part in middle outflow opening, it is divided into covering the track during contracting
First fast set contracting track and the second slow set contracting track.Once can cover contracting terraced part quilt cover contracting, its tubular side frame component relative to
The side frame members movement of adjacent ladder part, the movement cause valve member to be moved to throttle position.
But the air in adjacent terraced part still can be via the outflow opening among tubular side frame component from adjacent ladder portion
The inner space escape of the tubular side frame component divided, thus, the damping of air damper is limited.
Once valve member by the outflow opening among side frame members, then air no longer via the outflow opening from
The inside side frame members escape of adjacent ladder part.Thus, the outflow of air is more limited, and the damping of speed caused by gravity increases
Add.
Thus, terraced component is provided with staged damped trajectory, limits from the first upward damping of outflow opening, and
Be open second following (increased) damping.
It should be noted that by setting outflow opening at diverse location along tubular side frame part, it is possible to provide multiple damping stages.
Thus, the present invention provides a kind of air damper, it, which is designed, can be readily adapted to make air damper adaptation specific
The demand of the terraced part of contracting can be covered.
In this context, it should be noted that the terraced moiety by weight of extension ladder is different.In addition, ladder part covers among bottommost
During contracting, it also carries the weight of one or more other middle ladder parts and top ladder part.In addition, the size of annular opening and
Friction between the side frame members of flexible connection is different, hence for each terraced part, in terraced part set contracting caused by gravity
The required retardance of speed can be different.
Therefore, in the embodiment of extension ladder according to the present invention, the design of air damper, i.e. the size for the opening that throttles
, can be different for each ladder part with the degree that they are covered by valve member when in throttle position, to be thus each
Speed caused by terraced part provides preferable gravity when covering contracting.Preferably, ladder part, which from expanded position is moved to set and condenses, puts
The required time is that set is reduced to few 1.5 seconds per 30cm, e.g., from about 2 seconds, or each terraced part 1.5 seconds.Also, it should be mentioned that due to
The flexible link of terraced part, the particularly size of tubular side frame component, diameter are different for each ladder part.Thus, it is right
In each terraced part, the air damper in the bottom end of tubular side frame component is also different.Barrier structure and/
Or valve member and/or the size and dimension of actuator member thus can be different for each ladder part, to adapt to specific side frame
The size of component.For example, valve member is different for each ladder part from the length for the connector arm for grasping pad connection, with compensation
The diameter difference of the side frame members of corresponding ladder part.
Also, air damper according to the present invention includes being used for the valve member of sealing throttling opening at least in part, with
And the actuator member for valve member to be moved between throttling and un-throttled position.Thus, sealing and activate function does not have
Performed by same parts, for example, sealing ring.
It is, for example, each portion of single injection molded body even if valve member and actuator member are the components of monomer body
Point, separating for function is configured to its dedicated functions with still allowing each component optimization.
Thus, air damper according to the present invention is not easy to be worn and hindered by foreign particle compared with known air damper
Gear, such as small grid.
More than it is believed that the present invention provides a kind of telescopically deployable and can cover the terraced component of contracting, it has
Improved air damper.
In one embodiment, extension ladder component according to a first aspect of the present invention, for example, vertical ladder, has automatic gunlock
Structure (for example, in each end of crosspiece), it has one or more associated manually operable actuators, for solving
Lock tube shape side frame members, to allow the set of terraced component to contract, wherein, these one or more actuators are centrally disposed in terraced horizontal stroke
On shelves (preferably on front portion), and it can be operated at the same time by user is singlehanded.It has been found that the damper proposed allows to cover in ladder
The very controlled movement of terraced part is obtained during contracting.User is currently available singlehanded while operates one or more of actuators,
And guide the ladder part declined during the operation with his another hand at the same time and/or stablize the ladder.This allowed in the set contracting phase
Between terraced safety and gentle operation, and the quick movement observed in known extension ladder for the terraced part for avoiding declining and not
Desired impact.
According to the present invention, grasp the inner surface of the tubular side frame component of the adjacent terraced part of pad backup, with provide grasp pad and
CONTACT WITH FRICTION between the inner surface of side frame members.Thus, actuator includes elastic device, it pads separated grasp in backup
Surface, so that grasp pad realizes CONTACT WITH FRICTION with inner surface.
Elastic device may be configured as the form of elastic component, such as helical spring, it is installed on connector arm, will be grabbed
The inner surface of pad backup tubular side frame component is held, which moves on connector arm in such embodiments.
In an alternate embodiment, elastic device is incorporated in grasping pad.In such embodiments, pad is grasped by elastic material
Material is made, it is extruded, to provide the inner surface of the contact surface backup tubular side frame component of gripping member radially outward
The power of direction.
In a preferred embodiment, connector arm is elastic arm, i.e. elastic device is incorporated in connector arm.Such
In embodiment, connector arm is flexible and/or can be extruded, or sets flexible or can be squeezed laminate section, so that the arm can
Elastic force is provided, which will grasp the inner surface of pad backup tubular side frame component in a radially outer direction.
In one embodiment, the elastic part of elastic arm or at least elastic arm is extruded, there is provided will grasp pad shift onto it is adjacent
Biasing force on the inner surface of the side frame members of terraced part.
When side frame members are moved relative to adjacent side frame members, (particularly actuator member is described for actuator member
One or more separation grasps pad) CONTACT WITH FRICTION between the inner surface of adjacent side frame members causes actuator member to follow this
The movement of side frame members (it is already installed with damper above).This follows mobile for being moved between throttling and un-throttled position
Dynamic valve member.
In the embodiment of terraced component according to the present invention, there are air damper multiple separation to grasp pad, connector arm
It is circumferentially spaced from one another, preferably it is spaced apart at regular intervals, wherein, connector arm is each radially in valve structure
Extend between part and grasping pad, which is positioned above being provided with the central axial line of the tubular side frame component of air damper
On, it is preferably so that the central axial line of valve member is overlapped with the central axial line of tubular side frame component, the grasping pad is positioned at phase
At the inner surface of adjacent tubular side frame component.Preferably, connector arm is elastic arm, is produced by described two or more elastic arms
The inner surface that corresponding will grasp the tubular side frame component that pad is biased into adjacent terraced part on biasing force position intersecting
Point is intersecting, at the center of the crosspoint side frame members located above for being already installed with air damper.
Elastic arm is along the circumferential direction set (for example, with 90 degree of interval settings, four elastic arms, with 120 with aturegularaintervals
Degree is arranged at intervals three elastic arms, or is arranged at intervals two elastic arms with 180 degree) balanced support of actuator member is provided,
And thus provide the balance push-in of valve member and pull out, prevent mobile period of the tilting force between throttling and un-throttled position
Act on valve member.
In one embodiment, actuator member includes two elastic arms being diametrically located opposite to each other, so that two bullets
Property arm produce biasing force there is identical position.Thus, elastic arm generally forms single elastic arm, and it is preferably fixed that it has
The valve body of position at its center.
In one embodiment, actuator member is single part, it is preferably injection molded, and single part includes
Connector arm and grasping are padded, wherein, connector arm is preferably constructed to elastic arm.In a preferred embodiment, actuator member
It is injection molded, it includes two or more elastic arms, and the elastic arm is provided with grasping pad, for engaging tubular side frame
The inner surface of component, and elastic part is provided with, to allow arm to be biased into pad is grasped on the inner surface of side frame members.Elastic arm
It is configured such that, during assembly, when damper member is inserted into adjacent terraced part, they are extruded and/or bend,
So as to which when in the side frame members positioned at adjacent terraced part, elastic arm is biased, and thus provides elastic force, is pushed away for will grasp pad
By the inner surface of the tubular side frame component of adjacent terraced part.
In one embodiment, connector arm sets and has elastic component, e.g. plastics or metallic elastic component, or such as rubber
The elastic body of glue body, to provide is used to that the elastic force for padding the inner surface for being pressed against adjacent tubular side frame members will to be grasped.For example,
Each arm may be provided with helical spring, it is extruded so that air damper is fitted in the side frame members of adjacent terraced part, from
And spring arm is biased and grasps the inner surface that pad is pushed against the tubular side frame component of adjacent terraced part.
In an alternate embodiment, elastic device is incorporated in grasping pad, which is arranged to the form of elastic body, example
Such as the form of rubber body.In this embodiment, grasp pad and elastic force is provided, for being contacted the adjacent terraced part of surface backup
Tubular side frame component inner surface.In such embodiments, actuator member is, for example, injection molded body, it has
There are the two or more rubber inserts set along its periphery, the rubber insert forms elastic connecting touch pad, it is adjacent with engaging
The contact surface of the inner surface of the tubular side frame component of terraced part.
In the embodiment of terraced component according to the present invention, barrier structure forms valve seat, is preferably positioned as installed above having
On the central axial line of the tubular side frame component of air damper, it is preferably so that the central axial line and tubular side frame component of valve seat
Central axial line overlaps, which is configured to receive at least a portion of valve member, and in throttle position and un-throttled
The valve member is guided between position, preferably along the central axial line of tubular side frame component.
Thus, barrier structure is combined with the guiding function of the function of limiting one or more throttling openings and valve member.
In another embodiment, barrier structure has lower body portion, it is configured to receive actuator member at least
A part, when being pushed into valve member in throttle position or un-throttled position, to guide actuator member.In an embodiment
In, barrier structure, which provides, to be used to guide actuator member and/or at least one of guiding groove of its connector arm, is thus provided
Compact air damper with a small amount of component.In an embodiment according to the present invention, the barrier structure bag of air damper
Central valve seat is included, its form with cylindrical recess, valve body has the cylindrical shape for adapting to valve seat, so that valve seat is along above
The central axial line of tubular side frame component through being provided with air damper guides valve body.
In a further preferred embodiment, valve seat is provided with one or more throttling openings, when valve body is in non-section
When flowing position, the throttling opening is overlapped with the flow-through opening in valve body, and when valve body is in throttle position, described one
A or multiple throttling openings are covered by valve body.
It was observed that the weight combinations of be open with throttling construction (that is, size, shape and position) and terraced part, and depend on
In required retardance, valve member is designed to completely or only partly overlap throttling opening when being in throttle position.
When throttling opening is completely covered by valve member, when in throttle position, maximum retardance is realized.Such construction can
Such as the terraced part for covering contracting on the lower, and the damper of the higher middle terraced part of the less terraced part of relatively light and support
Element can require the only local complexity that throttling is open, to provide enough retardances.
As the replacement to local complexity throttling opening, barrier structure can limit it is additional run through opening, in throttling
It is not covered by valve member during position, and is thus always opened wide, to provide the retardance of the reduction of terraced part.
In one embodiment, barrier structure has the body of general disk-shape, it, which has, is provided with one or more protuberances
Circumferential outer surface, the protuberance be preferably along the form at the edge of outer surface circumference expansion, it is one or more of prominent
Go out portion and form guiding surface, for barrier structure to be centered in the tubular side frame component of adjacent terraced part, and for that can cover
During the set contracting and expansion of the terraced part of contracting barrier structure is guided along the longitudinal axis of the tubular side frame component of adjacent terraced part.
Barrier structure can be consequently for the side frame members for positioning and guiding it to have been installed within, and the side frame members are
It is inserted in wherein.In addition, the design of barrier structure can be consequently for limit can be via two when valve member is in throttle position
The amount for the air that the tubular side frame component of annular opening from adjacent terraced part between a side frame members being telescopically connected flows out.By
This, the design of barrier structure can be used for the speed of design ladder part set contracting when valve member is in throttle position.
In one embodiment, the barrier structure of air damper has upper fastening part, it is configured to receive tubulose side
The bottom end of frame member.For example, barrier structure can be with the body of general disk-shape, it has upstanding flange along its periphery, should
Upstanding flange limits the opening for the bottom end for being used to receive side frame members.
In another embodiment, barrier structure is provided with integral elastic fastener, such as buckle refers to portion, they are suitable for card
It is affixed in the associated aperture of side frame members, for barrier structure to be connected to side frame members, and thus air damper is installed
Onto side frame members.
The advantageous embodiment of extension ladder component according to the present invention discloses in dependent claims and specification, wherein,
The present invention is shown and is explained based on multiple exemplary embodiments, and some of embodiments are shown in exemplary drawings.
Brief description of the drawings
In the accompanying drawings：
Fig. 1 shows straight side view of the extension ladder in the case where covering contracting state according to the present invention,
Fig. 2 shows the ladder of Fig. 1 in the deployed state,
Fig. 3 shows perspective cross-sectional view of the air damper according to the present invention in first position,
Fig. 4 shows perspective cross-sectional view of the air damper in the second place of Fig. 3,
Fig. 5 shows the valve member of the combination of the air damper of Fig. 3 and the perspective view of actuator member；
Fig. 6 shows the perspective top side view of the barrier structure of the air damper of Fig. 3；
Fig. 7 shows the perspective bottom side view of the barrier structure of the air damper of Fig. 3；
Fig. 8 shows that the first of valve member and actuator according to the present invention replaces the top view of combination；
Fig. 9 shows that the second of valve member and actuator according to the present invention replaces the top view of combination；
Figure 10 shows that the 3rd of valve member and actuator according to the present invention replaces the top view of combination；With
Figure 11 schematically shows the section of the bottom end of the tubular side frame component for the air damper for being provided with Fig. 3
Figure, the side frame members are telescopically inserted in the tubular side frame component of adjacent terraced part.
Embodiment
Fig. 1 and 2 shows the example of terraced component that is telescopically deployable according to the present invention and can covering contracting, is embodied herein
For straight extension ladder 1.As explained above, terraced component can also be the part of other " terraced product ", and " the terraced product " is such as stepped on
Step ladder or combination ladder, have workbench of scalariform Retractive leg etc..
Terraced component 1 has bottom ladder part 2, top ladder part 3 and multiple middle terraced parts 4, shows in a particular embodiment
Go out for six.Each ladder part 2,3,4 includes two tubular side frame components 5,6, and each of which has bottom end 5a, 6a and top
End 5b, 6b.Tubular side frame component 5,6 is arranged as parallel to each other, and is interconnected at top ends by terraced crosspiece 7, to form U
Shape ladder part, and in this example embodiment, the tubular side frame component of bottom ladder part 2 is connected by bottom ladder crosspiece 8 in addition.Top ladder
Part 3 and middle terraced part 4 are the terraced parts that can cover contracting.The terraced part of contracting is covered each, the bottom of tubular side frame component 5,6
Portion end 5a, 6a are telescopically inserted into top ends 5b, 6b of the tubular side frame component 5,6 of adjacent terraced part, can with permission
The ladder part of set contracting is condensed to put and is moved between expanded position relative to adjacent ladder part in set, and thus allows the set of extension ladder
Contracting and expansion.
According to the present invention, the ladder part that can cover contracting is provided with air damper 9 (being shown in the viewgraph of cross-section of Figure 11),
They are installed in bottom end 5a, 6a of the tubular side frame component 5,6 for the terraced part 3,4 that can cover contracting.Each damping member by
This is located in the tubular side frame component of adjacent terraced part on the lower.
Each side frame members 5,6 of bottom ladder part 2 are provided with ground engagement foot component (for example, rubber etc. is made herein
).Shown exemplary terraced component 1 further includes automatic lock-latching mechanism, for when that can cover the ladder part of contracting in expanded position, inciting somebody to action
The tubular side frame component of the terraced part for covering contracting of flexible insertion is locked relative to adjacent ladder part, and bolt lock mechanism is unlocked with being used for
The actuator of tubular side frame component is associated, to allow the set of terraced component to contract.These actuators 10 are actuating for manual operation
Device, it is shown with reference numeral 10 in Fig. 1.Actuator 10 is slidably actuator, and be centrally disposed in the front side of crosspiece 7
On, operated at the same time in order to one hand.Crosspiece 7 is connected to associated side frame members 5,6 via connector.
As explained above, it is the speed of telescopic section when ladder covers contracting on the problem of extension ladder (such as ladder 1).In order to
Block the speed, multiple ladder parts are preferably provided with damper member, it provides ladder in the set contracting or expansion of terraced part
The retardance of speed caused by partial gravity.In figure 3, the example of air damper 10 of the invention is illustrated, it is based on
The sky in the tubular side frame component for the terraced part that can cover contracting is flowed to during 1 set of contracting of ladder to the tubular side frame component from adjacent terraced part
Air-flow throttles, and the retardance of speed caused by the gravity for the terraced part 2,3 that can cover contracting is provided in the set contracting of terraced part.Figure
11 schematically show the air damper of Fig. 3, it is installed in the bottom end of tubular side frame component, which stretches
Ground is inserted in the tubular side frame component of adjacent terraced part.
Each air damper 10 includes barrier structure 11, valve member 12 and actuator member 13.
Barrier structure 11 is installed on the bottom end 6a of tubular side frame component, and by the internal capacity of side frame members and side
The outside of frame member separates, particularly the internal capacity of adjacent side frame members.
According to the present invention, barrier structure limits throttling opening, it allows air from the tubular side frame component of adjacent terraced part
Flow in the tubular side frame component for the terraced part for covering contracting for being provided with damper member.In the example shown, barrier structure 11
It is provided with single throttling opening 14.Valve member 12 is movably supported relative to barrier structure 11, so that valve member can be opposite
Moved in barrier structure between the un-throttled position shown in Fig. 3 and throttle position shown in Fig. 4.In shown particular implementation
In example, valve member is supported in the valve seat in barrier structure, and is blocked component guiding, so that valve member is along tubular side frame component
Center line movement.It may be noted that the present invention be allowed for supporting and guide valve member other construct, for example, valve member and/or
Barrier structure may be provided with one or more elongated pins, and the elongated pin receives the opening in barrier structure and/or valve member
In, for guiding valve member between throttle position and un-throttled position relative to barrier structure.
In the shown embodiment, valve member is provided with flow-through opening 21, when valve member is in un-throttled position, the stream
Open up mouth to overlap with throttling opening, to allow air flow to pass through throttle position.When valve member is removed from un-throttled position, two
A opening no longer overlaps, and valve body closes throttling opening.It may be noted that the present invention allows the replacement structure of throttling opening and valve body
Make.
In the shown embodiment, valve member is provided with extension at its top ends in addition, which, which receives, is hindering
Keep off in the guide opening in component.Connector is inserted in extension, and valve member is removably fixed in barrier structure.Should
Construction allows the simple assembling of air damper.
Actuator member in shown exemplary air damper includes two grasping pads 15, and the grasping pad 15 is every
A inner surface with the tubular side frame component of adjacent terraced part 4 ' is positioned adjacent to.
Actuator member 13 includes being used for the connector arm 16 for each grasping pad 15 in addition, which will accordingly grasp
Pad is connected with valve member 12.In shown specific embodiment, connector arm is arranged to the form of elastic arm and is pushed away pad is grasped
Onto the inner surface of adjacent terraced part, each elastic arm includes elastic part 17.Thus, elastic arm 16 is grasping pad 15 and adjacent
CONTACT WITH FRICTION is provided between the inner surface of the side frame members of terraced part.By being provided with elastic part for connector arm, by elasticity
Device, which is incorporated into connector arm, allows actuator, and the simple and compact of --- the particularly connector arm of actuator --- is set
Meter.In the preferred embodiment shown, barrier structure has lower body portion 20, it is configured to receive actuator member 13
At least partially, with when valve member 12 is pushed into throttle position or its un-throttled position, actuator member is guided.
It may be noted that in air damper according to the present invention, connector arm is positioned at the bottom side of barrier structure, from
And outside the interior space for the tubular side frame component that connector arm and grasping pad are positioned above being already installed with valve member, and in phase
Within the inner surface of the tubular side frame component of adjacent ladder part.
In the shown embodiment, barrier structure is provided with flange portion, which prolongs along its periphery in a downwardly direction
Stretch, the flange portion limits two guiding grooves, and the part of connector arm and/or grid pad are movably received in the guiding
In groove, so that when valve member moves between its throttling and its un-throttled position, guiding groove guiding actuator member, or at least
Its connector arm.
Replacing structure --- in the lower surface for example using the barrier structure for the sidepiece for being arranged on engagement connector arm
Guiding rib or pin or wherein reception have the recess in the lower surface of the barrier structure of lead arm --- and it is feasible, it is used for
It is provided with for barrier structure for guiding actuator or at least part thereof of guide device.
In the shown embodiment, barrier structure 11 has the body of general disk-shape, it is with circumferential outer surface, by upward
Formed with the flange extended downwardly.The outer surface is provided with protuberance in its lower end, it extends along the circumference of outer surface.Should
Protuberance forms guiding surface, and is limited between the tubular side frame component and air damper of adjacent terraced part on the lower
Annular opening.The design of barrier structure is consequently for limiting what can be telescopically connected via two when valve member is in throttle position
The amount for the air that the tubular side frame component of annular opening from adjacent terraced part between side frame members flows out.Thus, barrier structure
Speed designed for design ladder part set contracting when valve member is in throttle position.
In the shown embodiment, the barrier structure of air damper has upper fastening part, it is configured to receive tubulose
The bottom end of side frame members.In another embodiment, barrier structure is provided with integral elastic fastener, such as buckle refers to
Portion, they are suitable for fixing into the associated aperture of side frame members, for barrier structure to be connected to side frame members, and thus by sky
Gas damper is installed on side frame members.
As it was previously stated, the throttling opening 14 limited by barrier structure 11 provides and is already installed with air damper above
The inner space of the side frame members of the inner space of side frame members and adjacent terraced part (that is, is already installed with air damping above
The side frame members of device stretch the inner spaces of the side frame members being plugged into) between connecting portion.
When valve member 12 is in un-throttled position, as shown in figure 3, air stream is already installed with air damper above
Tubular side frame component inner space and adjacent terraced part 4 ' side frame members inner space between flow through throttling and open
Mouth 14, and via the valve opening of valve in shown specific embodiment.
The air stream auxiliary tubular side frame members have been inserted into adjacent terraced part therein relative to the side frame members
The telescopic moving of side frame members.
When valve member 12 is in throttle position, as shown in figure 4, valve member seal throttling opening 14, thus manages two
Air stream between the inner space of shape side wall member throttles.Air stream the throttling retardance tubular side frame component relative to
The side frame members have been inserted into the telescopic moving of the side frame members of adjacent terraced part therein.
Actuator member 13 --- via contact surface 15 and elastic arm 16 --- provides valve member 12 and air damper 9
CONTACT WITH FRICTION between the inner surface for the tubular sidewall component being plugged into.Thus, when air damper 9 is relative to adjacent ladder
When partial side frame members are moved (that is, by the telescopic moving for the side frame members for being already installed with air damper 9 above), promote
Dynamic device component 13 will cause valve member 12 --- valve member is movably supported --- to be moved relative to barrier structure.Can
During the set contracting for covering the terraced part of contracting, the flexible side frame members for being already installed with air damper above are telescopically inserted into phase
In the side frame members of adjacent ladder part.The relative movement of side frame members causes actuator member, and (it frictionally engages phase on the lower
The inner surface of the side frame members of adjacent ladder part), valve member is pushed into throttle position.Thus, from the inside of adjacent terraced part
Air stream in the inner space that terraced part is contracted in space to set is throttled by air damper, and the gravity that can cover the terraced part of contracting is led
The speed of cause reduces.
During it can cover the expansion of terraced part of contracting, be already installed with above the flexible side frame members of air damper by from
Expand in the side frame members of adjacent ladder part.The relative movement of side frame members causes actuator member to be pushed into valve member
Into un-throttled position.Thus, air can flow to the terraced portion of expansion via throttling opening from the inner space of adjacent terraced part
In the inner space divided, this contributes to the expansion of terraced part.
According to the present invention, actuator plays the role of the connection part between valve member and adjacent terraced part, so that in ladder
Air damper is used to valve damper being moved to its throttle position relative to the movement of adjacent terraced part during set contracting or expansion
With the removal throttle position.
It may be noted that when valve member is in throttle position, ring that air can still between the side frame members being telescopically connected
The tubular side frame component of the adjacent terraced part of shape opening outflow.In alternative embodiment according to the present invention, opening in addition can be set
Put in adjacent terraced part, further to allow air to escape when the ladder part set contracting of contracting can be covered from adjacent ladder part, and
Thus the blockage effect of air damper is reduced.It is further noted that due to the flexible link of terraced part, tubular side frame component
Size, particularly diameter are different for each ladder part.Accordingly, for each terraced part, installed in tubular side frame component
Bottom end in the size of air damper be also different.In addition, can cover the effective weight of the terraced part of contracting on to
Under be different.This is because the size of terraced part reduces towards top ladder part.In addition, when nethermost middle ladder part covers
During contracting, its carry institute it is every other among ladder part and the weight of top ladder part.
Thus, the release and the contracting of subsequent set of middle ladder part (for example, terraced part among nethermost) cause among this
The ladder part (for example, bottom ladder part) that ladder is partially toward on the lower is mobile, and also makes terraced part all of the above ladder among this
Componental movement.
Thus, propose that the air damper of corresponding terraced part provides different retardances, to compensate the ladder to be blocked
Partial gross weight.Accordingly, for each terraced part, damper member is provided with specific damper feature.It is for example, higher
The damper member of terraced part may be provided with the valve member that only local complexity throttling is open when in throttle position, thus to reduce
The blockage effect of air damper.Shown preferred embodiment is extension ladder component, for example, being provided with automatic lock-latching mechanism (example
Such as, in each end of crosspiece) vertical ladder, it has one or more associated manually operable actuators, is used for
Tubulose side frame members are unlocked, to allow the set of terraced component to contract, wherein, these one or more actuators are centrally disposed in ladder
On crosspiece (preferably on front portion), and it can be operated at the same time so that user is singlehanded.It has been found that the damper proposed allows in ladder
Cover the very controlled movement that terraced part is obtained during contracting.User is currently available singlehanded while operates one or more of actuate
Device, and guide the ladder part declined during the operation with his another hand at the same time and/or stablize the ladder.This allows to contract in set
The safety of period ladder and gentle operation, and the quick movement observed in known extension ladder for the terraced part for avoiding declining and
Undesirable impact.
In the shown embodiment, all terraced parts for covering contracting, i.e. ladder part and top ladder part among all, at it
Tubular side frame component bottom end at be provided with air damper.
The tubular side frame component of bottom ladder part is provided with the body of connector type at their bottom end, it is inserted into
Into tubular side frame component, to provide foot/stent, for ladder to be supported on a support surface.
It is single channel air damper by air damper provided by the invention.In shown exemplary terraced type, when upper
When the ladder part for covering contracting that face is already installed with damper moves along the first direction (that is, towards bottom ladder part), the single channel
Air damper is active, i.e. is throttled to air stream.When the ladder part that can cover contracting is moved in opposite direction, air
Damper is changed into sluggish, i.e. does not throttle to air stream.Thus, ladder can rapidly and easily be unfolded.
Figure 4 and 5 individually show barrier structure 11.It should be noted that in shown specific embodiment, barrier structure forms valve
Seat 19, it is positioned at the center of tubular side frame component.Valve seat 19 is configured to receive valve member 12, and in throttling position
Put and guide valve member 12 along the central axial line of tubular side frame component between un-throttled position.Thus, barrier structure is combined with limit
The function of fixed one or more throttling openings and the guiding function of valve member.
In a further preferred embodiment, valve seat is provided with multiple throttling openings, when valve body is in un-throttled position
When, the throttling opening is overlapped with the flow-through opening in valve body, and when valve body is in throttle position, it is one or more
A throttling opening is overlapped by valve body.Fig. 3 shows valve member and actuator member.It should be noted that in shown specific embodiment
In, valve member is combined as single component with actuator member.In an alternate embodiment, actuator member is separate part, in sky
During the assembling of gas damper, it is connected to valve member.
In the illustrated exemplary embodiment, actuator member 13 includes two elastic arms being diametrically located opposite to each other
16, so that the biasing force that two elastic arms produce has identical position.Thus, elastic arm 16 generally forms single elasticity
Arm, it has the valve body for being preferably positioned as the center.
In addition, in an illustrated embodiment, actuator member 13 is single part, it passes through injection-molded manufacture.It is single
Component includes elastic arm 16 and grasps pad 15, described to grasp the integrated component that pad is elastic arm.
Connector arm 16 is each provided with elastic part 17, to allow connector arm to be biased into side frame members by pad 15 is grasped
Inner surface 18 on.
Fig. 8-10 shows the top schematic view of the valve member of injection-molded combination and the alternative embodiment of actuator member.
Valve member is substantially the same with the valve member shown in Fig. 3 and 4.The construction of elastic arm is different.
Embodiment shown in Fig. 8 and 9 is provided with the elastic arm alternatively shaped, and the elastic arm is provided with integral grab
Hold pad.Elastic arm is configured such that, when damper member is inserted into adjacent terraced part, they are extruded or bend, from
And when in the side frame members positioned at adjacent terraced part, elastic arm is biased, and thus provides elastic force, and backup is padded for that will grasp
The inner surface of the tubular side frame component of adjacent ladder part.
Figure 10 shows the valve member of combination and the embodiment of actuator member, wherein, disc shape body is provided with elastic rubber
Plug-in unit, it, which is formed, grasps pad, and when air damper is inserted in tubular side frame component, the elastic rubber plug-in unit is squeezed
Pressure, the biasing force of the inner surface of side frame members is pressed against with the contact surface provided engagement pad.
In an alternate embodiment, connector arm includes single flexible member, e.g. plastics or metallic elastic component, with
There is provided and be used to that the elastic force for padding the inner surface for being pressed against tubular side frame component will to be grasped.It was observed that depending on required retardance, throttling
The combination of the weight of opening construction (that is, size, shape and position) and terraced part, valve member are designed to work as throttle position
When completely or only partly overlap throttling opening.
When throttling opening is completely covered by valve member, it can be achieved that maximum retardance when in throttle position.Such construction
Can for example be used for the terraced part for covering contracting on the lower, and between the relatively senior middle school of the less terraced part of relatively light and support terraced part damper
Element can require the only local complexity that throttling is open, to provide enough retardances.
As the replacement to local complexity throttling opening, barrier structure can limit it is additional run through opening, saved in it
It is not covered by valve member during stream position, and is thus always opened wide, to provide the retardance of the reduction of terraced part.Figure 11 is schematic
Ground shows the sectional view of the bottom end of tubular side frame component, and the side frame members are provided with air damper and are telescopically inserted into
In the tubular side frame component of adjacent terraced part.Elastic arm will each grasp the tubular side frame component of the adjacent terraced part of pad backup
Inner surface.The elastic part of elastic arm or at least elastic arm is extruded, there is provided pads the side frame structure for shifting adjacent terraced part onto by grasping
Biasing force on the inner surface of part.When side frame members are moved relative to adjacent side frame members, actuator member (particularly actuates
Multiple grasping pads of device component) CONTACT WITH FRICTION between the inner surface of adjacent side frame members causes actuator member to follow the side
The movement of frame member.This follows mobile be used in the mobile valve member between un-throttled position that throttles.
Claims (15)
1. terraced component (1) that is a kind of telescopically deployable and can covering contracting, has bottom ladder part (2), top ladder part (3) and one
Ladder part (4) among a or multiple,
Wherein, each ladder part (2,3,4) includes two tubular side frame components (5,6), and the tubular side frame component (5,6) is each
With bottom end (5a, 6a) and top ends (5b, 6b), the tubular side frame component (5,6) be arranged as it is parallel to each other, and
Interconnected at top ends by terraced crosspiece (7), to form U-shaped ladder part, and wherein, the tubulose of the bottom ladder part (2)
Side frame members (5,6) are connected by bottom ladder crosspiece (8) in addition,
Wherein, top ladder part (3) and one or more of middle ladder parts (4) are the terraced parts that can cover contracting, described to cover
The ladder part of contracting each has the bottom end (5a, 6a) of tubular side frame component (5,6), and the bottom end (5a, 6a) is flexible
Ground is inserted into the top ends (5b, 6b) of the tubular side frame component (5,6) of adjacent terraced part, can cover the ladder of contracting described in permission
Part is condensed to put and is moved between expanded position relative to adjacent ladder part in set,
Wherein, the terraced component further includes automatic lock-latching mechanism, for when the ladder part for covering contracting is in expanded position, inciting somebody to action
The tubular side frame component of the ladder part (3,4) for covering contracting of flexible insertion is locked relative to adjacent ladder part, the bolt lock mechanism
It is associated with the actuator (10) for unlocking tubulose side frame members, to allow the set of terraced component to contract, wherein, it is multiple it is described can
The ladder part of set contracting is provided with air damper (9), the air damper (9) be installed on it is described can cover contracting ladder part (3,
4) in the bottom end of tubular side frame component (5,6),
It is characterized in that, the air damper (9) based on cover contract during to the tubular side frame component stream from adjacent terraced part
Throttle to the air stream in the tubular side frame component of the terraced part for covering contracting, and institute is provided in the set contracting of terraced part
The retardance of speed caused by stating the gravity for the ladder part (3,4) that can cover contracting,
Wherein, each air damper (9) includes：
Barrier structure (11), the barrier structure are installed in the bottom end of tubular side frame component (5,6), the barrier structure limit
Fixed one or more throttling openings (14), one or more of throttling openings (14) allow air from the tubulose of adjacent terraced part
Side frame members are flowed in the tubular side frame component for the terraced part for covering contracting for being provided with damper member；
Valve member (12), the valve member are movably supported relative to barrier structure (11), so that valve member (12) can be
Moved between un-throttled position and throttle position relative to the barrier structure, in the un-throttled position, air is flowable logical
One or more of throttling openings (14) are crossed, in the throttle position, valve member (12) seals one at least in part
Or multiple throttling openings (14), being flow to the tubular side frame component to throttle from adjacent terraced part installed above has damper member
The terraced part for covering contracting tubular side frame component in air；With
Actuator member (13), the actuator member include one or more separated grasp and pad (15) and elastic device, institute
State one or more pads (15) that grasp and valve member is each connected to by connector arm (16), and one or more of grasp is padded
The inner surface positioning of the tubular side frame component of each neighbouring adjacent terraced part, the elastic device is by one or more of separation
Grasping pad backup inner surface so that grasping pad and inner surface forms CONTACT WITH FRICTION,
Wherein, valve member (12) is pushed into section by actuator member (13) during ladder part (3,4) the set contracting for covering contracting
Position is flowed, valve member (12) is pushed into un-throttled position during ladder part (the 3,4) expansion for covering contracting.
2. ladder component according to claim 1, wherein, actuator includes multiple separated grasp and pads, wherein, the connection
Device arm is circumferentially spaced from one another, is preferably spaced apart at regular intervals, and wherein, the connector arm is each along footpath
Extend to direction between the valve member and the grasping pad, the valve member is positioned above being provided with air damper
On the central axial line of tubular side frame component, it is preferably so that the central axial line of the valve member and the axis of centres of tubular side frame component
Line overlaps, and the pad that grasps is positioned at the inner surface of adjacent tubular side frame members.
3. one or more terraced components in preceding claims, wherein, one or more of connector arms
It is the elastic arm for including elastic device, which is incorporated in arm, so that each arm is provided grasps pad radially by described
The elastic force of the inner surface of upward direction backup tubular side frame component.
4. one or more terraced components in preceding claims, wherein, the barrier structure forms valve seat, excellent
Selection of land is positioned above being provided with the central axial line of the tubular side frame component of air damper, is preferably so that the valve seat
Central axial line is overlapped with the central axial line of tubular side frame component, which is configured to receive at least a portion of valve member,
And for guiding the valve member between throttle position and un-throttled position, preferably along the central axial line of tubular side frame component
Guide the valve member.
5. one or more terraced components in preceding claims, wherein, the barrier structure has big body disc
The body of shape, the body have the circumferential outer surface for being provided with one or more protuberances, and the protuberance is preferably edge
The edge of outer surface circumference expansion, one or more of protuberances form guiding surface, for the barrier structure to be felt relieved
In the tubular side frame component of adjacent terraced part, and it is used for during the set contracting and expansion of the terraced part for covering contracting along adjacent
The central axial line of the tubular side frame component of terraced part guides the barrier structure.
6. one or more terraced components in preceding claims, wherein, the barrier structure has upper fastening
Part, it is configured to the bottom end for receiving tubulose side frame members, the air damper is installed on side frame members.
7. one or more terraced components in preceding claims, wherein, the barrier structure, it is therefore preferable to hinder
The upper fastening part of gear component is provided with integral flexible fastener, and the integral flexible fastener, which is suitable for fixing, arrives tubular side frame structure
In associated aperture in part.
8. one or more terraced components in preceding claims, wherein, the barrier structure has body
Point, the body part is configured to receive at least a portion of actuator member, the valve member is being pushed into throttling
When in position or un-throttled position, the actuator member is guided.
9. one or more terraced components in preceding claims, wherein, the actuator member is monomer portion
Part, preferably injection-molded single component.
10. one or more terraced components in preceding claims, wherein, the valve member and actuator member
Single component is combined as, preferably injection-molded single component.
11. one or more terraced components in preceding claims, wherein, some in the air damper
Barrier structure limit additional opening, do not covered when the additional opening is in throttle position by the valve member, with allow
When the valve member is in throttle position, air flow to from adjacent ladder part and is already installed with the valve member above
In terraced part.
12. one or more terraced components in preceding claims, wherein, it is associated with bolt lock mechanism described in
One or more actuators are centrally disposed on terraced crosspiece, preferably on front portion, and can be operated at the same time with one hand by user.
A kind of 13. valve damper, in one or more terraced components in preceding claims.
14. a kind of step, has the first step component and the second step component mutually hinged, so as in against that
This fold deposit position and in the operating position similar to inverted V-shaped, at least one step component is according to claim
One or more terraced components in 1-12.
15. a kind of workbench, including one or more terraced components in claim 1-11.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2015340A NL2015340B1 (en) | 2015-08-24 | 2015-08-24 | Telescopic ladder assembly. |
| NL2015340 | 2015-08-24 | ||
| PCT/NL2016/050581 WO2017034399A1 (en) | 2015-08-24 | 2016-08-18 | Telescopic ladder assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108026755A true CN108026755A (en) | 2018-05-11 |
| CN108026755B CN108026755B (en) | 2020-06-30 |
Family
ID=55178238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680056211.4A Active CN108026755B (en) | 2015-08-24 | 2016-08-18 | Extension ladder assembly |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3341553B1 (en) |
| CN (1) | CN108026755B (en) |
| NL (1) | NL2015340B1 (en) |
| WO (1) | WO2017034399A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206000447U (en) * | 2016-05-20 | 2017-03-08 | 东莞鼎翰铝制品有限公司 | A kind of extension ladder with pooling feature |
| WO2018088906A1 (en) * | 2016-11-14 | 2018-05-17 | Lampe Holding B.V. | Telescopic ladder assembly |
| CN209908391U (en) * | 2019-04-04 | 2020-01-07 | 东莞凯丰家居用品有限公司 | Telescopic ladder rod unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893371A (en) * | 1994-09-20 | 1996-04-09 | Takashi Teramoto | Ladder |
| CA2291986A1 (en) * | 1995-09-08 | 1997-03-09 | Wang, Tai-Lin | An extension ladder with telescopic legs |
| CN2610056Y (en) * | 2003-04-08 | 2004-04-07 | 钱贤平 | Telescopic ladder |
| EP2157276A2 (en) * | 2008-08-22 | 2010-02-24 | Core Distribution Inc. | Extendable and retractable ladder |
| EP2770155A1 (en) * | 2012-06-26 | 2014-08-27 | Ningbo Xingfu Tools Co., Ltd. | Safe telescopic ladder capable of preventing hand from being pinched |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743355A (en) | 1996-07-31 | 1998-04-28 | Mcdonnell; Charles A. | Retractable ladder |
-
2015
- 2015-08-24 NL NL2015340A patent/NL2015340B1/en not_active IP Right Cessation
-
2016
- 2016-08-18 EP EP16767035.5A patent/EP3341553B1/en active Active
- 2016-08-18 WO PCT/NL2016/050581 patent/WO2017034399A1/en active Application Filing
- 2016-08-18 CN CN201680056211.4A patent/CN108026755B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893371A (en) * | 1994-09-20 | 1996-04-09 | Takashi Teramoto | Ladder |
| CA2291986A1 (en) * | 1995-09-08 | 1997-03-09 | Wang, Tai-Lin | An extension ladder with telescopic legs |
| CN2610056Y (en) * | 2003-04-08 | 2004-04-07 | 钱贤平 | Telescopic ladder |
| EP2157276A2 (en) * | 2008-08-22 | 2010-02-24 | Core Distribution Inc. | Extendable and retractable ladder |
| EP2770155A1 (en) * | 2012-06-26 | 2014-08-27 | Ningbo Xingfu Tools Co., Ltd. | Safe telescopic ladder capable of preventing hand from being pinched |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108026755B (en) | 2020-06-30 |
| EP3341553A1 (en) | 2018-07-04 |
| NL2015340B1 (en) | 2017-03-16 |
| WO2017034399A1 (en) | 2017-03-02 |
| EP3341553B1 (en) | 2020-01-01 |
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