CN102753771B - Folding stairway ladders - Google Patents
Folding stairway ladders Download PDFInfo
- Publication number
- CN102753771B CN102753771B CN201180006193.6A CN201180006193A CN102753771B CN 102753771 B CN102753771 B CN 102753771B CN 201180006193 A CN201180006193 A CN 201180006193A CN 102753771 B CN102753771 B CN 102753771B
- Authority
- CN
- China
- Prior art keywords
- ladder
- section
- collapsible
- stairs
- spring
- 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.)
- Expired - Fee Related
Links
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 206010033307 Overweight Diseases 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 235000020825 overweight Nutrition 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/04—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible
- E04F11/06—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic
- E04F11/062—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic folding
- E04F11/064—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic folding with stringers overlapping when folded
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Ladders (AREA)
- Steps, Ramps, And Handrails (AREA)
Abstract
The invention relates to a foldable stairs, and in particular to a metal foldable ladder- like stairs, comprising stairs segments (2, 3, 4) moveable with relation to each other, wherein the uppermost segment (2) is rotationally connected with a frame (1 ) mounted in a ceiling and preferably the uppermost stairs segment (2) is attached to the cover (11 ) that adheres to said frame (1 ) in the stairs closed state and is connected with the frame (1 ) by means of a hinge mechanism and the stairs segments (2, 3, 4) are positioned within the frame (1 ) in the stairs closed state, where the stairs are preferably provided with a mechanism, preferably a spring mechanism, that supports lifting folded stairs up to the stairs closed state and at least partially counterbalances the weight of the stairs during opening thereof,; and further the stairs are provided with at least one handrail arranged in the top part of the stairs flight. In order to facilitate folding and unfolding the stairs and to provide the stairs featuring adjustable length, the stairs comprise a spring (6) that supports lifting up of the stairs segments (3, 4, 7) other than the uppermost segment (2) during folding these segments (3, 4, 7) with the uppermost segment (2) and at least partially counterbalances the weight of these segments (3, 4, 7) during unfolding the stairs, wherein the spring (6) is arranged inside the handrail (5). The bottom segment (4) of the stairs is advantageously provided with means (41, 42) for regulating the length of the bottom segment (4).
Description
Technical field
The present invention relates to collapsible ladder (stair), more specifically, relate to metal folding ladder shape (ladder-like) ladder, this ladder embeds and is arranged on the framework in ceiling, and being placed in framework with closure state, the open mode that ladder is changed into for using is drops down ladder.Such ladder is mainly as loft entrance.Described ladder also can be used as having and is similar to the function of ladder but the folding ladder steeper than general ladder conventionally.
Background technology
Prior art discloses to embed and has been arranged on the Collapsible ladder shape ladder in the framework in ceiling.This known ladder comprises by means of interconnective three sections of hinge (segment).Epimere is disposed in one and covers, and this cap seal closes the framework of the ladder in closure state.Ladder is folded up and is interlude and bottom stage to be placed on epimere, and so folding structure is upwards promoted.Although these ladders are provided with the spring that supported folding ladder promotes as a whole together with lid, these ladders are not provided for folding interlude and bottom stage to place them in the auxiliary tool of epimere.Especially inconvenience in the situation that lacks the metal ladder that overweights wooden ladder far away of this auxiliary tool.
Summary of the invention
The invention provides collapsible ladder, metal folding ladder shape ladder especially, comprising: about ladder section movably each other; At least one handrail, is arranged in the top section of one section of ladder (stairs flight); And a spring, during the ladder section except epimere being folded in to epimere, support these ladder sections that promote except epimere, and during opening ladder the weight of these sections of balance at least in part.Described spring is disposed in handrail.Described handrail preferably has telescopic construction, and the pillar of handrail is connected with two ladder sections, is preferably articulated type and connects (jointedly connect).In the situation of ladder with the section being connected through the hinge, it is necessary that the articulated type between handrail post and ladder section connects.
The epimere of ladder is rotatably connected with the framework being arranged in ceiling.Epimere is preferably attached to as next one lid, and this covers and when ladder closure state, is bonded to described framework and is connected with framework by linkage.Remaining ladder section is positioned in described framework when ladder closure state, is positioned at epimere top.Ladder be unfolded for use open mode time, epimere and remaining section are arranged by this way, that is, make their the downward-sloping extension of longeron (stringer) (curb girder), wherein the top surface of ladder step (pedal) is basic horizontal orientation.Collapsible ladder according to the present invention is provided with Yi Ge mechanism, is provided preferably with a spring mechanism, and this spring mechanism supported folding ladder is upwards promoted to ladder closure state, and during opening ladder the weight of balance ladder at least in part.
According to one embodiment of the invention, each of collapsible ladder section is connected through the hinge.Hinge is preferably alternately settled along the top surface of the longeron of these sections and the connecting portion in succession in lower surface.According to the ladder of this embodiment three sections of structures normally, wherein said flexible armrest articulated type is connected to epimere and the section adjacent with epimere.The connecting portion of flexible armrest and ladder section is located by this way,, when the open mode that ladder launches, the axis of the hinge that the epimere section of being adjacent is connected is positioned at above the straight line between the axis in the joint (joint) that connects described handrail and these sections.Due to this situation, in being unfolded for the ladder of opening using, spring is strained the longeron of two sections mutually, and therefore stablizes the linearity that they are located mutually.
During upwards folding ladder, by the section adjacent with epimere with respect to this epimere after little angle of chain connection portion rotation, the straight line between the axis in the joint that handrail post is connected with ladder section should be displaced to above the horizontal axis of hinge of these sections of connection.As a result, the tension force of spring should be as support promoting in abutting connection with all ladder sections of epimere.On the other hand, during launching ladder, be arranged in the weight of the spring section that balance has been launched at least in part in flexible armrest, when the line between the axis in the joint that handrail is connected with corresponding section is displaced to the some below that the axis of the hinge between the section that epimere is adjacent with it passes, spring should be strained the longeron of these sections mutually.
According to another embodiment of the invention, collapsible ladder is provided with at least one slidably section.Conventionally, so slidably section should be the section adjacent with epimere.Significantly, other sections also can be connected through the hinge with respect to adjacent section slip or they.Preferably, with spring, the flexible armrest of---upwards promoting of the section of this spring supporting except epimere---at one end should be connected with epimere, at the other end, should be connected with the slidably section adjacent with epimere, or should be connected with an ensuing section of articulated type, described ensuing section by hinge with this slidably section be connected.Obviously, at handrail, only with the situation that coordinates of section slidably, the articulated type connection between handrail and ladder section is unwanted.
Preferably, according to the present invention, the spring being arranged in flexible armrest is provided with tension adjustment, preferably by an adjustment screw tensioning insert inner with the circle (coil) that is positioned at spring, is coordinated and is carried out tension adjustment.The external surface of tensioning insert is advantageously provided with helical groove, the shape of the inner side of the circle of the form fit spring of this helical groove.Be disposed in the inside of tensioning insert with the nut of tension adjustment screw fit.
In addition, according to the bottom stage of ladder of the present invention, be provided with the device (means) for regulating the whole length of ladder, to regulate described ladder to make its applicable ladder wait to be mounted and to launch the height for the inside, house of using.
In an embodiment of this device, the bottom stage of ladder can advantageously be provided with following feet, and this feet is outstanding slidably, to extend the length of bottom stage.
Extraly or alternatively, bottom stage can be provided with at least one removable insert, can regulate the length of this section.Preferably, bottom stage is provided with two removable insert that are connected in series.According to the expection length of this section and ladder as a whole, one or two insert can be removed from this section of bottom.
In another embodiment of this device, the bottom stage of ladder can advantageously be provided with the feet that regulates length, and according to the expection length of bottom stage, this feet can be directly fixed to the bottom removable insert of bottom stage or bottom stage.
By means of spring supports, promote the ladder section except epimere, collapsible ladder according to the present invention is convenient, and this is because when launching ladder, and these ladders are than the power much less of the ladder needs of ordinary construction.This layout of spring has been improved in handrail to the aesthetic appearance of ladder.The bottom stage that has the ladder of the function that regulates its length according to of the present invention is provided, makes it possible to regulate easily the length of ladder to be applicable to the height in the residence that this ladder is to be mounted.
Accompanying drawing explanation
With reference to the preferred embodiments of the invention and with reference to accompanying drawing below exemplified with the present invention, preferred embodiment should not be considered to restrictive by any way, in the accompanying drawings:
Fig. 1 shows according to the schematic side elevation of the first embodiment of collapsible ladder of the present invention, and this ladder has three sections, and these three sections are mutually removable, and is connected through the hinge in the open mode being unfolded for using;
Fig. 2 shows the schematic side elevation of the ladder of the Fig. 1 under intermediateness folding or that launch;
Fig. 3 shows according to the schematic section side view of flexible armrest of the present invention embodiment, and this handrail supports with one the spring that ladder section is folded up; And
Fig. 4 shows another embodiment according to ladder of the present invention, and this ladder has four sections, and these four sections are mutually arranged slidably, and are connected through the hinge in the open mode being unfolded for using.
The specific embodiment
According to another embodiment of collapsible ladder of the present invention, do not describe in the accompanying drawings, but at large described this another embodiment with reference to common trait and the different characteristic of embodiment illustrated in the accompanying drawings.
embodiment 1
Three sections of folding ladder shape ladders shown in Fig. 1 and 2 comprise the framework 1 in the ceiling that is embedded in building.Framework 1 can be from bottom tegmentum 11 closures, and described lid 11 is connected to framework by the pulling rod structure of opening limit of a linkage and a described lid 11 of restriction.Framework 1 is also comprised to following spring with lid 11 structures that are connected, and described spring upwards lifts lid 11 together with folding ladder section during the described lid of closure, and during opening described lid, described in balance, covers 11 and the weight of ladder.The epimere 2 of ladder is fixed on and covers on 11, and the interlude 3 of ladder is connected to epimere 2 by the hinge being positioned on the top surface of longeron (stringer) (curb girder) of these sections.Bottom stage 4 is connected to interlude 3 by the hinge being positioned in the lower surface of longeron of these sections.At ladder, be unfolded for the open mode of using, the end of the longeron of adjacent section 2,3 and 4 mutually combines, to maintain their adjusting to a line.During ladder is folded up, interlude 3 is in the rotation of its hinge place, until interlude rests on epimere 2, and bottom stage 4 is in its hinge place rotation, until bottom stage rests on interlude 3.Next, section 2,3 and 4 together promotes together with cover, and is hidden in framework 1.
Ladder is provided with a following flexible armrest 5, and this flexible armrest 5 is attached via a hinge to epimere 2, and by the pillar 51 of this flexible armrest, is connected to the interlude 3 of ladder.Described handrail is positioned at the outside of the longeron of these two sections 2,3, and articulated type is connected to the outer surface of longeron.Ladder also can have two such handrails of the both sides that are arranged on ladder section.
Flexible armrest comprises that two concentric tubes 64,65(of circular cross section are referring to Fig. 3).At described pipe, about the region of displacement toward each other, the end of exterior tube 65 is sleeves 66, and this sleeve 66 is placed in the inside of exterior tube and has external flange, and the end of inner tube 64 is sleeves 67 with inner flange.Sleeve 67 limits by following resilient key with respect to the position of inner tube 64, and described resilient key gives prominence to and be inserted in the opening forming in the wall of inner tube 64 towards the inner radial of sleeve 67.Sleeve 66,67 is preferably all made of plastics.
Tension spring 6 of internal placement at flexible armrest.This spring supports and promotes interlude 3 and bottom stage 4 when being jointly folded on epimere 2 when interlude 3 and bottom stage 4, and when launching ladder the weigh weight of these sections of at least part of Horizon.This spring is particularly useful for the metal ladder heavier than wooden ladder.At one end, spring 6 is provided with rest 68, and this rest 68 is hooked on a transverse bolt 69 being fixed in exterior tube 65, and at the other end of spring 6, tensioning insert 61 by internal placement between turn.The external surface of tensioning insert 61 is provided with helicla flute, the shape of the inner side of the circle of the spring 6 of this spiral fluted form fit under tensioning state not (pitch of therefore also mating the spring under tensioning state not), one of them nut 62 coordinating with tension adjustment screw 63 is disposed in tensioning insert 61 inside.The sleeve 67 being arranged on the end of inner tube 64 has inner collar 690, and this collar 690 has opening, and the diameter of this opening is less than the internal diameter of pipe 64 slightly, so the collar 690 is as an extra induction element of spring 6.Sleeve 67 is to be convenient to turn to introduce taper wherein at the opening of the front of the collar 690.
Flexible armrest 5 is envisioned in such a way with being connected of interlude 3 with epimere 2, which makes in the ladder of opening, and the axis that connects the hinge of these two sections is positioned at the straight line top of the axis that extends past the joint that connects described handrail and these sections.Due to this situation, in the ladder launching, spring 6 is strained the longeron of these sections mutually, stablizes their position.
The end of the bottom stage 4 of ladder is two removable insert that are connected in series 41, and wherein bottom insert is provided with feet 42, and feet 42 is provided with for regulating them from the device of this section of outstanding length.Adjustable range is approximately equal to the length of insert 41.Such structure makes it possible to regulate according to the height in the house of ladder installation the length of ladder.Realize and regulating in the following way, that is, and by making the outstanding expection length of feet 42, and if desired, also by dismantling one or two insert 41 and feet 42 being directly connected with the remainder of ladder.
embodiment 2
Four sections of folding ladder shape ladders shown in Fig. 4 comprise the framework 1 in the ceiling that is embedded in building.Framework 1 can be from bottom tegmentum 11 closures, lid 11 by linkage and with embodiment 1 in similarly pulling rod structure be connected to framework.The epimere 2a of ladder is fixed on and covers on 11.Interlude 7 is the section of being connected to 2a slidably, and described interlude 7 and section subsequently---, an interlude 8 and a bottom stage 4a---by hinge, interconnect.
The chain connection of top surface of longeron of interlude 8 by being positioned at these sections 7,8 be to section 7 slidably, and the chain connection of lower surface of bottom stage 4a by being positioned at these section of 4a, 7 longeron is to interlude 7.Be unfolded for opening in ladder of using, the end of adjacent interlude 7,8 and the longeron of 4a mutually combines, and maintains their adjusting to a line.
Ladder is also provided with a flexible armrest 5, and this flexible armrest 5 is connected epimere 2a with the interlude 7 of slidably arranging.Handrail 5 is disposed in the outside of longeron of these two sections of ladder, and by two handrail posts, is fixed to the external surface of longeron.Obviously, ladder can have in its both sides two or more such handrails, and/or has the handrail (being for example fixed to epimere 2a and interlude 8) that is fixed to other sections.In the inside of handrail, be provided with a spring, this spring-like is similar to the spring of embodiment 1, and is provided with tension regulating function.
When ladder is folded, the slidably section 7 that should move up along the length of epimere 2a, this action is supported by the tension spring that is arranged in flexible armrest 5 inside.Then interlude 8 should be on the hinge of interlude, rotated, until it is placed in slidably in section 7, bottom stage 4a should be on the hinge of bottom stage 4a, rotated, until it is placed on interlude 8 simultaneously.Should upwards promote all sections together with lid 11 subsequently, so that ladder is hidden in framework 1.
embodiment 3
Be similar to embodiment 1, folding ladder shape ladder comprises the framework in the ceiling that is embedded in building, and this framework can be closed by a lid, and described lid is connected to framework by linkage with the pulling rod structure of spring.The method of the chain connection system between one group of ladder shape section, each section and expansion and folding described section is identical with embodiment 1.
In this embodiment, flexible armrest has slightly different structure, and comprises two C shape section bars (profile), and wherein inner section bar is placed in outside section bar as follows slidably, that is, make it possible to inner section bar flexible outstanding from outside section bar.The flange (end sections of arm) of outside section bar is bent, can guide safely inner section bar.
Each section bar is set to coordinate with other section bars by plastic material flanging in its end, and this contributes to section bar relative to each other mutually to slide.In addition the terminate in enlarged undercut portions section that, two section bars are all oriented them is at top.Inner at section bar, can be from tensioning spring of arranged beneath.Similar with embodiment 1 and 2 before, this spring supports the lifting of these interludes and bottom stage when all interludes of ladder and bottom stage are folded in epimere, and when launching described interlude and bottom stage the weigh weight of these sections of at least part of Horizon.
Two ends at spring have rest, and spring is arranged on the inside of handrail by transverse bolt.Handrail is provided with a plurality of sockets, so that these pins can regulating spring tension force, wherein the distribution of these sockets is different for each end of spring (and handrail), has therefore strengthened the ability of selective adjustable range.Each section bar is provided with pillar, and this pillar is fixedly attached to section bar, and articulated type is connected to the corresponding section of ladder, and wherein significantly, each section bar section different from connects.
Claims (18)
1. a collapsible ladder, comprise mutually movably ladder section, wherein epimere is connected rotatably with the framework being arranged in ceiling, described ladder is further provided with at least one handrail of the top section that is arranged in one section of ladder, it is characterized in that, described ladder comprises a spring (6), this spring is by ladder section (3, 4, 7, 8) during folding with epimere (2), support these ladder sections (3 that promote except described epimere (2), 4, 7, 8), and during launching described ladder these sections (3 of balance at least in part, 4, 7, 8) weight, wherein said spring (6) is disposed in described handrail (5), wherein said handrail (5) has telescopic construction, and the pillar of this handrail (51) and two ladder sections (2, 3, 2,7) connect.
2. collapsible ladder according to claim 1, is characterized in that, ladder section (2,3,4; 7,8,4a) be connected through the hinge, epimere (2) and the section (3,7) adjacent with described epimere (2) described in wherein said flexible armrest (5) is connected to by articulated type.
3. collapsible ladder according to claim 2, it is characterized in that, at ladder, launch, during open mode, described in connection epimere with the axis of the hinge of the adjacent segment of this epimere above the straight line between the axis in joint that is connected described handrail and these sections.
4. collapsible ladder according to claim 1, is characterized in that, described ladder is provided with at least one slidably section (7).
5. according to the collapsible ladder described in claim 1-4 any one, it is characterized in that, described spring (6) is provided with tension adjustment.
6. collapsible ladder according to claim 5, it is characterized in that, described spring (6) is provided with tension adjustment, by an adjustment screw (63), is coordinated and carries out tension adjustment with the tensioning insert (61) of inside that is positioned at the circle of described spring (6).
7. collapsible ladder according to claim 6, it is characterized in that, the external surface of described tensioning insert (61) is provided with helical groove, the shape of the inner side of the circle of spring described in the form fit of this helical groove (6), the nut (62) wherein coordinating with tension adjustment screw (63) is arranged in described tensioning insert (61) inside.
8. according to the collapsible ladder described in claim 1-4 any one, it is characterized in that, the bottom ladder section (4) of described ladder is provided with following feet (42), and this feet can be given prominence to extend the length of bottom stage (4) slidably.
9. according to the collapsible ladder described in claim 1-4 any one, it is characterized in that, bottom ladder section (4) is provided with at least one removable insert (41), and this removable insert makes it possible to regulate the length of this section (4).
10. according to the collapsible ladder described in claim 1-4 any one, it is characterized in that, bottom ladder section (4) is provided with the feet that regulates length, according to the expection length of bottom stage, this feet can be directly fixed to the bottom removable insert (41) of bottom stage (4) or bottom stage (4).
11. collapsible ladders according to claim 1, is characterized in that, described collapsible ladder is metal folding ladder shape ladder.
12. collapsible ladders according to claim 1, it is characterized in that, go up most ladder section and be attached to following lid, this covers and when ladder closure state, is bonded to described framework and is connected with described framework by linkage, when ladder closure state described in ladder section be positioned in described framework.
13. collapsible ladders according to claim 1, is characterized in that, described ladder is provided with Yi Ge mechanism, and the folding ladder of this mechanism supports is promoted to ladder closure state and the weight of ladder described in balance at least in part during opening described ladder.
14. collapsible ladders according to claim 13, is characterized in that, this mechanism is spring mechanism.
15. collapsible ladders according to claim 1, is characterized in that, the pillar of this handrail (51) and two ladder sections (2,3; 2,7) articulated type connects.
16. collapsible ladders according to claim 2, is characterized in that, described hinge is alternately settled along the top surface of the longeron of these sections and the connecting portion in succession in lower surface.
17. collapsible ladders according to claim 4, is characterized in that, described section (7) adjacent with epimere (2a) are arranged slidably about this epimere (2a).
18. collapsible ladders according to claim 9, is characterized in that, bottom stage (4) is provided with two removable insert (41) that connect in insert.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL390219A PL224400B1 (en) | 2010-01-18 | 2010-01-18 | Folding stairway ladders, preferably made of metal |
| PLP.390219 | 2010-01-18 | ||
| PCT/PL2011/000004 WO2011087385A2 (en) | 2010-01-18 | 2011-01-12 | Foldable stairs, in particular metal foldable ladder-like stairs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102753771A CN102753771A (en) | 2012-10-24 |
| CN102753771B true CN102753771B (en) | 2014-11-19 |
Family
ID=43828320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180006193.6A Expired - Fee Related CN102753771B (en) | 2010-01-18 | 2011-01-12 | Folding stairway ladders |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2526240B1 (en) |
| CN (1) | CN102753771B (en) |
| HK (1) | HK1173481A1 (en) |
| PL (1) | PL224400B1 (en) |
| WO (1) | WO2011087385A2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL229816B1 (en) * | 2012-03-09 | 2018-08-31 | Fakro Pp Spolka Z Ograniczona Odpowiedzialnoscia | Folding stairs, especially lightweight wooden stairs |
| CN103016050B (en) * | 2012-12-12 | 2014-10-29 | 南京大学 | Foldable-type liftable protection device used for geological prediction in tunnels |
| US10538966B2 (en) * | 2017-05-10 | 2020-01-21 | Werner Co. | Ceiling ladder, deep step and method |
| CN107859473A (en) * | 2017-12-10 | 2018-03-30 | 陈星宇 | Folding ladder |
| CN111765581B (en) * | 2020-06-24 | 2021-07-16 | 深圳市金源达建设集团有限公司 | Building energy-saving ventilation system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1700904A (en) * | 1927-02-21 | 1929-02-05 | Paul G Marschke | Folding stair structure |
| US1767148A (en) * | 1925-04-27 | 1930-06-24 | Berthold V Marschke | Folding and disappearing stairs |
| DE1103553B (en) * | 1958-07-24 | 1961-03-30 | Herta Hermanns Geb Nell | Foldable stairs that can be swiveled up with the help of tension springs |
| FR2194864A1 (en) * | 1972-07-29 | 1974-03-01 | Frank Gmbh Wilh | |
| US3871479A (en) * | 1973-07-13 | 1975-03-18 | Clarence H Pelto | Telescoping stairway |
| CN2179864Y (en) * | 1993-11-11 | 1994-10-19 | 宗必泽 | Automatic alternating staircase of elevating table |
| CN2611566Y (en) * | 2003-02-28 | 2004-04-14 | 上海太比雅科技有限公司 | Wall safety haddler |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT4864U1 (en) * | 1998-10-23 | 2001-12-27 | Wipplinger Robert | ROOF FLOOR STAIR |
| US7621374B2 (en) | 2005-08-10 | 2009-11-24 | Precision Ladders, Llc | Sectional overhead ladder with a fold assist feature |
-
2010
- 2010-01-18 PL PL390219A patent/PL224400B1/en unknown
-
2011
- 2011-01-12 CN CN201180006193.6A patent/CN102753771B/en not_active Expired - Fee Related
- 2011-01-12 EP EP11707229.8A patent/EP2526240B1/en active Active
- 2011-01-12 WO PCT/PL2011/000004 patent/WO2011087385A2/en active Application Filing
-
2013
- 2013-01-15 HK HK13100614.1A patent/HK1173481A1/en not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1767148A (en) * | 1925-04-27 | 1930-06-24 | Berthold V Marschke | Folding and disappearing stairs |
| US1700904A (en) * | 1927-02-21 | 1929-02-05 | Paul G Marschke | Folding stair structure |
| DE1103553B (en) * | 1958-07-24 | 1961-03-30 | Herta Hermanns Geb Nell | Foldable stairs that can be swiveled up with the help of tension springs |
| FR2194864A1 (en) * | 1972-07-29 | 1974-03-01 | Frank Gmbh Wilh | |
| US3871479A (en) * | 1973-07-13 | 1975-03-18 | Clarence H Pelto | Telescoping stairway |
| CN2179864Y (en) * | 1993-11-11 | 1994-10-19 | 宗必泽 | Automatic alternating staircase of elevating table |
| CN2611566Y (en) * | 2003-02-28 | 2004-04-14 | 上海太比雅科技有限公司 | Wall safety haddler |
Also Published As
| Publication number | Publication date |
|---|---|
| PL224400B1 (en) | 2016-12-30 |
| HK1173481A1 (en) | 2013-05-16 |
| WO2011087385A2 (en) | 2011-07-21 |
| WO2011087385A3 (en) | 2011-12-01 |
| EP2526240B1 (en) | 2017-09-20 |
| PL390219A1 (en) | 2011-08-01 |
| CN102753771A (en) | 2012-10-24 |
| EP2526240A2 (en) | 2012-11-28 |
| WO2011087385A4 (en) | 2012-01-26 |
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