EP3569810A1 - Horizontally extendable ladder - Google Patents
Horizontally extendable ladder Download PDFInfo
- Publication number
- EP3569810A1 EP3569810A1 EP18181786.7A EP18181786A EP3569810A1 EP 3569810 A1 EP3569810 A1 EP 3569810A1 EP 18181786 A EP18181786 A EP 18181786A EP 3569810 A1 EP3569810 A1 EP 3569810A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rung
- rails
- hole
- pivot
- ladder
- 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.)
- Withdrawn
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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
- E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
- E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/14—Ladders capable of standing by themselves
- E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
- E06C1/18—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as ladders
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
- E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding
- E06C1/3835—Foldable ladders in which the longitudinal members are brought together on folding having collapsible steps comprising a hinge in their central part
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/08—Special construction of longitudinal members, or rungs or other treads
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/08—Special construction of longitudinal members, or rungs or other treads
- E06C7/082—Connections between rungs or treads and longitudinal members
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
Description
- The present invention relates to an extension ladder, especially to a horizontally extendable ladder that includes at least two ladder frames each of which consists of two rails and a plurality of rungs arranged between the two rails. The rungs between the two adjacent rails can be rotated synchronously for horizontal extension or retraction of the ladder.
- A ladder is a useful tool with many applications in our daily lives. It allows users to work at height such as ceiling decoration, painting, change of lighting, storage of object, etc. Besides leaning ladders and A-shaped ladders, ladders types further include foldable ladders or telescoping ladders. The A shaped ladders are forms by two ladders whose tops are connected while the bottoms are apart and against ground for supporting. However, the ladder available now includes only a single ladder frame (whose width is about the same with the width of the rung) so that only one person can climb the ladder. The operation range/width of the user climbing the ladder to a certain height is limited. Once the work area at height is quite large, users need to set up the ladder and get access to a part of the work area. Then the users need to shift the ladder several times and get access to the rest part of the work area for completing the operation. It takes time for users to go up and down the ladder during the operation. Thereby not only the operation time is increased, the user also consumes much physical strength. Moreover, the ladder only allows one person to climb. When at least two workers need to climb to the height at the same time (such as for lifting an object), they need to use two ladders arranged in parallel respectively. Thus the ladder cause trouble to the user and the efficiency of the ladder is affected negatively.
- Therefore it is a primary object of the present invention to provide a horizontally extendable ladder that includes at least three rails and a plurality of rungs. The three rails are set vertically while the rungs are equally spaced and arranged horizontally between the two adjacent rails from top to bottom to form at least two ladder frames. Each of two ends of the rung is arranged with a first pivot shaft that is pivotally connected to the rail. Thereby the rungs can be rotated synchronously between the two adjacent rails for horizontal retraction or extension of the ladder. Thereby the problems of the conventional ladder such as only allowing one person to use and the limited horizontal operation range can be solved. The ladder can be used more efficiently.
- In order to achieve the above object, a horizontally extendable ladder according to the present invention includes at least two ladder frames formed by at least three rails. The three rails consist of two outer rails and one middle rail set between the two outer rails. A plurality of rungs is equally spaced and arranged horizontally between the two adjacent rails from top to bottom. The two adjacent rails and the rungs therebetween form one ladder frame. A first pivot shaft arranged at each of two ends of the rung is pivotally connected to the rail so that the rungs can be rotated synchronously between the two adjacent rails. Thereby the rungs of the ladder frame can be rotated and folded between the two adjacent rails to form a first collapsed state by the first pivot shafts on the two ends thereof. While the rungs of the respective ladder frame are in the first collapsed state, the two adjacent rails can be moved close to each other and held together so as to reduce the width and the area of the respective ladder frame. Each rung of the respective ladder frame are rotated and extended between the two adjacent rails by the first pivot shafts on the two ends thereof to become an extended state when the two adjacent rails in the first collapsed state are extended horizontally. The at least two ladder frames are extended synchronously to form the horizontally extendable ladder in an extended state with the extended width and area of the two ladder frames. Or only one of the ladder frames is selected and opened fully to form the horizontally extendable ladder in the extended state and having the width and area of the single frame.
- The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
-
Fig. 1 is a schematic drawing showing a front view of an embodiment extended fully according to the present invention; -
Fig. 2 is a schematic drawing showing a front view of an embodiment partially retracted according to the present invention; -
Fig. 3 s a schematic drawing showing a front view of the embodiment in -
Fig. 2 retracted completely according to the present invention; -
Fig. 4 is a schematic drawing showing a front view of another embodiment extended fully according to the present invention; -
Fig. 5 is a schematic drawing showing a front view of the embodiment in -
Fig. 4 partially retracted according to the present invention; -
Fig. 6 s a schematic drawing showing a front view of the embodiment in -
Fig. 4 retracted completely according to the present invention; -
Fig. 7 is a schematic drawing showing a front view of a further embodiment extended fully according to the present invention; -
Fig. 8 is a schematic drawing showing a front view of the embodiment in -
Fig. 7 partially retracted according to the present invention; -
Fig. 9 s a schematic drawing showing a front view of the embodiment in -
Fig. 7 retracted completely according to the present invention; -
Fig. 10 is a schematic drawing showing a front view of a further embodiment extended fully according to the present invention; -
Fig. 11 is a schematic drawing showing a front view of the embodiment inFig. 10 partially retracted according to the present invention; -
Fig. 12 s a schematic drawing showing a front view of the embodiment in -
Fig. 10 retracted completely according to the present invention. -
Fig. 13 is a schematic drawing showing a top view of the embodiments in -
Fig. 1 andFig. 4 according to the present invention; -
Fig. 14 is a top plan view of the embodiments inFig. 7 andFig. 10 according to the present invention; -
Fig. 15 is a schematic drawing showing the embodiment inFig. 1 placed against a wall surface according to the present invention; -
Fig. 16 is a schematic drawing showing the embodiment inFig. 7 leaned against a wall surface according to the present invention; -
Fig. 17 is a perspective view of an embodiment of an A-shaped ladder according to the present invention; -
Fig. 18 is a perspective view of another embodiment of a A-shaped ladder according to the present invention; -
Fig. 19 is a partial enlarged view of the embodiment inFig. 7 according to the present invention; -
Fig. 20 is a partial enlarged view of the embodiment inFig. 8 according to the present invention; -
Fig. 21 is a partial enlarged view of a section of an embodiment of a rung according to the present invention; -
Fig. 22 is schematic drawing showing the rails in the embodiment ofFig. 21 inclined and set on the ground according to the present invention; -
Fig. 23 is a partial enlarged view of a section of another embodiment of a rung according to the present invention; -
Fig. 24 is a left side view of the rung inFig. 23 according to the present invention; -
Fig. 25 is a right side view of the rung inFig. 23 according to the present invention; -
Fig. 26 is schematic drawing showing the rails in the embodiment ofFig. 23 inclined and set on the ground according to the present invention; -
Fig. 27 is a left side view of the rung inFig. 26 according to the present invention; -
Fig. 28 is a right side view of the rung inFig. 26 according to the present invention; - A common ladder includes a leaning ladder, an A-shaped ladder, etc. The present invention features on the horizontal extension of the ladder.
- Refer to
Fig. 1-18 , a horizontallyextendable ladder 1 according to the present invention includes at least two ladder frames 10. The at least two ladder frames 10 consist of at least threerails 20 and a plurality ofrungs 30. The threerails 20 are arranged vertically and are composed of twoouter rails 21 and at least onemiddle rail 22 set between the twoouter rails 21. Therungs 30 are equally spaced and arranged horizontally between the twoadjacent rails 20 from top to bottom. In the embodiments shown in figures, there are three ladder frames 10 included in the horizontallyextendable ladder 1. There are fourrails 20 formed by twoouter rails 21 and twomiddle rails 22. Each of the two ends 31 of therung 30 is arranged with afirst pivot shaft 40 that is pivotally connected to therail 20. Thereby therungs 30 can be rotated synchronously between the twoadjacent rails 20, as shown inFig. 2 ,Fig. 5 ,Fig. 8 andFig. 11 . - The
rung 30 of therespective ladder frame 10 can be rotated and folded between the twoadjacent rails 20 by thefirst pivot shafts 40 of the two ends 31 to become a first collapsed state, as shown inFig. 3 andFig. 6 . Now the twoadjacent rails 20 can be moved close to each other and held together so that the width and the area of eachladder frame 10 are minimized. The volume transported is also reduced. - While the two
adjacent rails 20 in the first collapsed state are extended horizontally, each rung 30 of therespective ladder frame 10 are rotated and extended by thefirst pivot shafts 40 on the two ends 31 thereof to form an extended state, as shown inFig. 1 ,Fig. 4 ,Fig. 7 andFig. 10 . - Moreover, the two ladder frames 10 can be extended synchronously to expand the width (range) of the ladder, as shown in
Fig. 1 ,Fig. 4 ,Fig. 7 andFig. 10 . Or only one of the ladder frames 10 is selected and opened fully to form the horizontallyextendable ladder 1 in the extended state and having the width (range) of the single frame 10 (not shown in figure). - Refer from
Fig. 7 to Fig. 12 , the horizontallyextendable ladder 1 further includes a plurality ofsecond pivot shafts 50 each of which is set on a middle part of therespective rung 30 of theladder frame 10. Thus therespective rung 30 can be rotated and retracted between the twoadjacent rails 20 by thefirst pivot shafts 40 and thesecond pivot shaft 50, and further folded into a second collapsed state, as shown inFig. 9 andFig. 12 . - Refer to
Fig. 1 ,Fig. 7 andFig. 13-18 , avertical slot 60 is disposed on each of the twoouter rails 21 among the threerails 20 and an opening of thevertical slot 60 is facing therespective rung 30 between the tworails 20. Thefirst pivot shaft 40 on each of the two ends 31 of therung 30 is arranged at a front wall and a rear wall of thevertical slot 60. The front wall hereafter is referred to the wall on one side of theextendable ladder 1 where users climb. Themiddle rail 22 of the threerails 20 is further provided with twoslots 70 that are oppositely oriented and openings of theslots 70 are facing therungs 30 between the two adjacent rails 20(21, 22) respectively. Thefirst pivot shaft 40 on each of the two ends 31 of therung 30 is arranged at a front wall and a rear wall of theslot 70. As shown inFig. 3 ,Fig. 6 ,Fig. 9 , andFig. 12 , the twoadjacent rails 20 are able to be moved toward each other and held together and therespective rung 30 is able to be mounted in theslot respective rung 30 being rotated and folded between the twoadjacent rails 20 to be in the first collapsed state/or the second collapsed state by rotation of thefirst pivot shafts 40 or thesecond pivot shaft 50. Therespective frame 10 is easy to fold flat for storage. - Furthermore, the
rungs 30 of the two adjacent ladder frames 10 can be arranged linearly along the same horizontal line, as shown inFig. 1-3 orFig. 7-9 , or arranged in parallel, as shown inFig. 4-6 orFig. 10-12 , or a combination thereof. - Refer to
Fig. 21 and Fig. 22 , therespective rung 30 of theladder frame 10 is designed into aninclined rung 30a having a reverse U-shaped section and composed of ashorter front support 301, a longerrear support 302 and aramp 303 tilted down. The length of therear support 302 is longer than that of thefront support 301 while theramp 303 is arranged between a top of thefront support 301 and a top of therear support 302 and used as a stepped surface allowing users to step thereon. Theramp 303 is tilted and a forward tilt angle is formed between theramp 303 of theinclined rung 30a and the ground when therails 20 of therespective ladder frame 10 are vertically set on the ground, as shown inFig. 21 . Theramp 303 of theinclined rung 30a is parallel to the ground so that users can step thereon conveniently when therails 20 of theladder frame 10 are inclined at an angle and placed on the ground (such as the horizontallyextendable ladder 1 is leaned against the wall). - Refer to
Fig. 23-28 , for pivotally connecting thefirst pivot shaft 40 to a front wall and a rear wall of the vertical slot 60 (70) of the respective rail 21 (22), afront pivot hole 80a is formed on the front wall of the vertical slot 60 (70) and arear pivot hole 80 is set on the rear wall of the vertical slot 60 (70). Afront end 41 and arear end 42 of thefirst pivot shaft 40 are pivotally connected to thefront pivot hole 80a an d therear pivot hole 80 respectively. Thefront pivot hole 80a is a gourd-shaped hole formed by anupper hole 81 and alower hole 82 communicating with theupper hole 82. Theupper hole 81 and therear pivot hole 80 are at the same horizontal level of therespective rail Fig. 23-25 . Thus thefront end 41 of the respectivefirst pivot shaft 40 can be moved vertically in thefront pivot hole 80a to be located in theupper hole 81 or thelower hole 82, as shown inFig. 24 and Fig. 27 . Refer toFig. 23-25 , when thefront end 41 of thefirst pivot shaft 40 of eachrung 30 is located in theupper hole 81 of thefront pivot hole 80a and therear end 42 is located in the correspondingrear pivot hole 80, therespective rung 30 can be rotated and folded synchronously between the twoadjacent rails 20 to form the first collapsed state or the second collapsed state. Refer toFig. 26-28 , the front end of thefirst pivot shaft 40 of therespective rung 30 is moved downward from theupper hole 81 of thefront pivot hole 80a to thelower hole 82 of thefront pivot hole 80a when therespective rail 20 of therespective ladder frame 10 is inclined at an angle and set on the ground and therespective rung 30 is stepped by users (in the direction of the arrow A inFig. 26 ). Thereby the stepped surface of therespective rung 30 is parallel to the ground, allowing users to step thereon conveniently. - Refer to
Fig. 23 and Fig. 26 , therespective rung 30 further includes a reverse U-shaped section formed by afront support 304, arear support 305 and a steppedsurface 306 connected between the top of thefront support 304 and the top of therear support 305. Abevel face 304a is disposed on a front surface of thefront support 304 while abevel face 305a is arranged at a rear surface of therear support 305. Thereby thefront end 41 of thefirst pivot shaft 40 of therespective rung 30 is moved downward from theupper hole 81 to thelower hole 82 of thefront pivot hole 80a and turned back in the opposite direction smoothly. By the design of the bevel faces304a, 305a, therespective rung 30 will not be stopped by the front wall and the rear wall of thevertical slot 70 during the movement. - The
rail 20 and therung 30 of the present invention can be produced by aluminum extrusion. Thus the ladder features on light weight and high rigidity. - In summary, the present ladder has the following advantages:
- 1. The present ladder includes at least two ladder frames 10. Users can extend the two ladder frames 10 synchronously or only one
ladder frame 10 selectively according to their needs. Thus the operational efficiency is improved. - 2. The present ladder includes at least two ladder frames 10 so that the ladder allows at least two users to climb at the same time. Thereby the efficiency of the ladder is increased.
- Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalent.
Claims (12)
- A horizontally extendable ladder comprising:
at least two ladder frames that includesat least three rails having two outer rails and a middle rail set between the two outer rails, anda plurality of rungs disposed between the two adjacent rails;wherein the rungs are equally spaced and arranged horizontally between the two adjacent rails from top to bottom; thereby the ladder frame is formed by the two adjacent rails and the rungs arranged between the two adjacent rails; a first pivot shaft is set on each of two ends of the rung and is pivotally connected to the rail so that the rung is able to be rotated synchronously between the two adjacent rails; wherein the rung of the ladder frame is able to be rotated and folded between the two adjacent rails by the first pivot shafts on the two ends thereof to form a first collapsed state;
wherein the two adjacent rails are able to be moved close to each other and held together so as to reduce width and area of the ladder frame when the rung of the ladder frame is in the first collapsed state;
wherein the rung of the ladder frame is rotated and extended between the two adjacent rails by the first pivot shafts on the two ends thereof to form an extended state when the two adjacent rails in the first collapsed state are extended horizontally;
wherein the two ladder frames are able to be extended synchronously to form the horizontally extendable ladder in an extended state with extended width and area of the two ladder frame; or only one of the ladder frames is opened selectively and fully to form the horizontally extendable ladder in an extended state with width and area of the single ladder frame. - The device as claimed in claim 1, wherein a second pivot shaft is disposed on a middle part of the rung of the ladder frame so that the rung is able to be rotated and retracted between the two adjacent rails by the first pivot shafts and the second pivot shaft, and further folded into a second collapsed state.
- The device as claimed in claim 1, wherein a vertical slot is disposed on each of the two outer rails of the three rails and an opening of the vertical slot is facing the rung between the two rails; the first pivot shaft on each of the two ends of the rung is arranged at a front wall and a rear wall of the vertical slot; wherein the middle rail of the three rails is further provided with two vertical slots that are oppositely oriented and openings of the vertical slots are facing the rungs between the two adjacent rails; the first pivot shaft on each of the two ends of the rung is arranged at a front wall and a rear wall of the vertical slot; wherein the two adjacent rails are able to be moved toward each other and held together and the rungs are able to be mounted in the slots after the rungs being rotated and folded between the two adjacent rails to be in the first collapsed state by synchronous rotation of the first pivot shafts.
- The device as claimed in claim 2, wherein a vertical slot is disposed on each of the two outer rails of the three rails and an opening of the vertical slot is facing the rung between the two rails; the first pivot shaft on each of the two ends of the rung is arranged at a front wall and a rear wall of the vertical slot; wherein the middle rail of the three rails is further provided with two vertical slots that are oppositely oriented and openings of the vertical slots are facing the rungs between the two adjacent rails; the first pivot shaft on each of the two ends of the rung is arranged at a front wall and a rear wall of the vertical slot; wherein the two adjacent rails are able to be moved toward each other and held together and the rungs are able to be mounted in the slots after the rungs being rotated and folded between the two adjacent rails to be in the second collapsed state by synchronous rotation of the second pivot shafts.
- The device as claimed in claim 1, wherein the rungs of the two adjacent ladder frames are arranged linearly along the same horizontal line or in parallel.
- The device as claimed in claim 1, wherein the rung of the ladder frame is an inclined rung having a reverse U-shaped section and composed of a shorter front support, a longer rear support and a ramp that is tilted down, arranged between a top of the front support and a top of the rear support, and used as a stepped surface; the ramp is tilted and a forward tilt angle is formed between the ramp of the rung and the ground when the rails of the ladder frame are vertically set on the ground; the ramp of the rung is parallel to the ground when the rails of the ladder frame are inclined and placed on the ground so that users can step on the rung conveniently.
- The device as claimed in claim 5, wherein the rung of the ladder frame is an inclined rung having a reverse U-shaped section and composed of a shorter front support, a longer rear support and a ramp that is tilted down, arranged between a top of the front support and a top of the rear support, and used as a stepped surface; the ramp is tilted and a forward tilt angle is formed between the ramp of the rung and the ground when the rails of the ladder frame are vertically set on the ground; the ramp of the rung is parallel to the ground when the rails of the ladder frame are inclined and placed on the ground so that users can step on the rung conveniently.
- The device as claimed in claim 3, wherein a front pivot hole is formed on the front wall of the vertical slot and a rear pivot hole is set on the rear wall of the vertical slot when the first pivot shaft on each of the two ends of the rung is arranged at the front wall and the rear wall of the vertical slot of the rail; a front end and a rear end of the first pivot shaft are pivotally connected to the front pivot hole an d the rear pivot hole respectively; the front pivot hole is a gourd-shaped hole including an upper hole and a lower hole communicating with the upper hole; the upper hole and the rear pivot hole are at the same horizontal level of the rail so that the front end of the first pivot shaft is able to be moved vertically in the front pivot hole to be located in the upper hole or the lower hole; the rung is able to be rotated and folded synchronously between the two adjacent rails to form the first collapsed state or the second collapsed state when the front end of the first pivot shaft of the rung is located in the upper hole of the front pivot hole and the rear end is located in the corresponding rear pivot hole; the front end of the first pivot shaft of the rung is moved downward from the upper hole of the front pivot hole to the lower hole of the front pivot hole when the rails of the ladder frame are inclined at an angle and set on the ground; thereby a stepped surface of the rung is parallel to the ground, able to be stepped thereon conveniently.
- The device as claimed in claim 4, wherein a front pivot hole is formed on the front wall of the vertical slot and a rear pivot hole is set on the rear wall of the vertical slot when the first pivot shaft on each of the two ends of the rung is arranged at the front wall and the rear wall of the vertical slot of the rail; a front end and a rear end of the first pivot shaft are pivotally connected to the front pivot hole an d the rear pivot hole respectively; the front pivot hole is a gourd-shaped hole including an upper hole and a lower hole communicating with the upper hole; the upper hole and the rear pivot hole are at the same horizontal level of the rail so that the front end of the first pivot shaft is able to be moved vertically in the front pivot hole to be located in the upper hole or the lower hole; the rung is able to be rotated and folded synchronously between the two adjacent rails to form the first collapsed state or the second collapsed state when the front end of the first pivot shaft of the rung is located in the upper hole of the front pivot hole and the rear end is located in the corresponding rear pivot hole; the front end of the first pivot shaft of the rung is moved downward from the upper hole of the front pivot hole to the lower hole of the front pivot hole when the rails of the ladder frame are inclined at an angle and set on the ground; thereby a stepped surface of the rung is parallel to the ground, able to be stepped thereon conveniently.
- The device as claimed in claim 8, wherein the rung of the ladder frame having a reverse U-shaped section is composed of a shorter front support, a longer rear support and a stepped surface connected between a top of the front support and a top of the rear support for being stepped thereon; a bevel face is disposed on a front surface of the front support while a bevel face is arranged at a rear surface of the rear support; thereby the front end of the first pivot shaft of the rung is moved downward from the upper hole to the lower hole of the front pivot hole and turned back in the opposite direction smoothly.
- The device as claimed in claim 9, wherein the rung of the ladder frame having a reverse U-shaped section is composed of a shorter front support, a longer rear support and a stepped surface connected between a top of the front support and a top of the rear support for being stepped thereon; a bevel face is disposed on a front surface of the front support while a bevel face is arranged at a rear surface of the rear support; thereby the front end of the first pivot shaft of the rung is moved downward from the upper hole to the lower hole of the front pivot hole and turned back in the opposite direction smoothly.
- The device as claimed in claim 1, wherein the rail and the rung are produced by aluminum extrusion.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810463319.6A CN110485910A (en) | 2018-05-15 | 2018-05-15 | The ladder that can be laterally extended |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3569810A1 true EP3569810A1 (en) | 2019-11-20 |
Family
ID=62873284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18181786.7A Withdrawn EP3569810A1 (en) | 2018-05-15 | 2018-07-04 | Horizontally extendable ladder |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP3569810A1 (en) |
KR (1) | KR20190002901U (en) |
CN (1) | CN110485910A (en) |
AU (1) | AU2019203121A1 (en) |
BR (1) | BR202019009740U2 (en) |
CA (1) | CA3041323A1 (en) |
MX (1) | MX2019005574A (en) |
PH (1) | PH12019050078A1 (en) |
RU (1) | RU2019114552A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113700431B (en) * | 2021-07-28 | 2023-03-21 | 国家电网有限公司 | Portable electric power multifunctional maintenance long ladder capable of being folded and extended quickly |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US988086A (en) * | 1910-05-03 | 1911-03-28 | Lee O Garraway | Folding step-ladder. |
NL7114825A (en) * | 1971-10-28 | 1973-05-02 | ||
WO2003014516A1 (en) * | 2001-08-10 | 2003-02-20 | Ghost Manufacturing Incorporated | Collapsible step ladder and carrying case |
US20030234140A1 (en) * | 2002-06-25 | 2003-12-25 | Edward Zheng | Foldable ladder |
JP2004044247A (en) * | 2002-07-12 | 2004-02-12 | Asatada Hentona | Open-close type escape ladder |
TWM501481U (en) * | 2014-07-07 | 2015-05-21 | yu-cong Liao | Foldable ladder |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2830626Y (en) * | 2005-08-22 | 2006-10-25 | 陈靖华 | Self-locking safety A-ladder |
TWM419819U (en) * | 2011-08-05 | 2012-01-01 | Omnis Entpr Co Ltd | Ladder with rungs thereof joined with a wide pedal respectively |
CN207228991U (en) * | 2017-08-29 | 2018-04-13 | 合肥惠科金扬科技有限公司 | Folded ladder |
CN208364038U (en) * | 2018-05-15 | 2019-01-11 | 孙守义 | The ladder that can be laterally extended |
-
2018
- 2018-05-15 CN CN201810463319.6A patent/CN110485910A/en active Pending
- 2018-07-04 EP EP18181786.7A patent/EP3569810A1/en not_active Withdrawn
-
2019
- 2019-04-26 CA CA3041323A patent/CA3041323A1/en not_active Abandoned
- 2019-05-03 AU AU2019203121A patent/AU2019203121A1/en not_active Abandoned
- 2019-05-09 KR KR2020190001895U patent/KR20190002901U/en unknown
- 2019-05-13 BR BR202019009740U patent/BR202019009740U2/en not_active IP Right Cessation
- 2019-05-13 MX MX2019005574A patent/MX2019005574A/en unknown
- 2019-05-14 RU RU2019114552A patent/RU2019114552A/en not_active Application Discontinuation
- 2019-05-15 PH PH12019050078A patent/PH12019050078A1/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US988086A (en) * | 1910-05-03 | 1911-03-28 | Lee O Garraway | Folding step-ladder. |
NL7114825A (en) * | 1971-10-28 | 1973-05-02 | ||
WO2003014516A1 (en) * | 2001-08-10 | 2003-02-20 | Ghost Manufacturing Incorporated | Collapsible step ladder and carrying case |
US20030234140A1 (en) * | 2002-06-25 | 2003-12-25 | Edward Zheng | Foldable ladder |
JP2004044247A (en) * | 2002-07-12 | 2004-02-12 | Asatada Hentona | Open-close type escape ladder |
TWM501481U (en) * | 2014-07-07 | 2015-05-21 | yu-cong Liao | Foldable ladder |
Also Published As
Publication number | Publication date |
---|---|
CA3041323A1 (en) | 2019-11-15 |
BR202019009740U2 (en) | 2020-05-05 |
KR20190002901U (en) | 2019-11-25 |
AU2019203121A1 (en) | 2019-12-05 |
RU2019114552A3 (en) | 2020-11-16 |
CN110485910A (en) | 2019-11-22 |
RU2019114552A (en) | 2020-11-16 |
MX2019005574A (en) | 2019-11-18 |
PH12019050078A1 (en) | 2019-12-11 |
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