NL2013339B1 - A telescopic ladder assembly. - Google Patents
A telescopic ladder assembly. Download PDFInfo
- Publication number
- NL2013339B1 NL2013339B1 NL2013339A NL2013339A NL2013339B1 NL 2013339 B1 NL2013339 B1 NL 2013339B1 NL 2013339 A NL2013339 A NL 2013339A NL 2013339 A NL2013339 A NL 2013339A NL 2013339 B1 NL2013339 B1 NL 2013339B1
- Authority
- NL
- Netherlands
- Prior art keywords
- ladder
- rung
- grip element
- actuators
- manually operable
- Prior art date
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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
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- Ladders (AREA)
Abstract
The invention relates to a telescopically extendable and collapsible ladder assembly having at a top ladder section, a bottom ladder section, and one or more intermediate ladder sections. According to the invention, the top rung of the bottom ladder section is provided with a centrally arranged grip element that forms a housing for manually operable release actuators provided at the bottom side of the rung. The manually operable release actuators are each movable, parallel to the front wall and the back wall of the grip element and along the bottom wall of the rung, between a rest position and an actuated positon, to allow for manually operating the latch mechanisms and unlocking the stile members of the adjacent higher ladder section by pushing the manually operable release actuators towards each other and into the grip element.
Description
A TELESCOPIC LADDER ASSEMBLY
The present invention relates to a telescopically extendable and collapsible ladder assembly having a top ladder section, a bottom ladder section, and one or more intermediate ladder sections. The top ladder section and each of the one or more intermediate ladder sections have two tubular stile members arranged parallel to each other and interconnected at a top end by a ladder rung to form a U-shaped ladder section. The bottom ladder section has two tubular stile members arranged parallel to each other and interconnected by a top ladder rung and a bottom ladder rung.
The ladder rungs are made from an aluminium tubular profile, for example an extruded aluminium profile, the profile including a top wall, a bottom wall, as well as a front and a rear wall extending between the top wall and the bottom wall.
The stile members of the top ladder section and the one or more intermediate ladder sections are telescopically inserted into the stile members of an adjacent lower ladder section, so that the one or more intermediate ladder sections and the top ladder section can be collapsed in a collapsing direction towards the bottom ladder section.
The top rung of the bottom ladder section and the rung of each of the one or more intermediate ladder sections are provided at each end with an automatic latch mechanism, said automatic latch mechanisms being adapted for automatically locking the stile members of the adjacent higher ladder section in a fully extended position of said adjacent higher ladder section.
The automatic latch mechanisms of the intermediate ladder sections are each associated with a release actuator for unlocking the stile members of an adjacent higher ladder section in order to allow for, preferably automatic, release and collapsing of the ladder assembly.
The automatic latch mechanisms of the bottom ladder section are each associated with a manually operable release actuator for unlocking of the stile members of the adjacent higher ladder section by a user in order to allow for a manually release and collapsing of the ladder assembly.
Telescopic ladder assemblies have become quite popular as portable ladders, such as a straight telescopic ladder or a step ladder, but also for stationary mounting, such as a loft ladder providing access to a loft. The tubular stile members are commonly made of extruded aluminium profiles, e.g. of circular, oval, square, or other cross-sectional shape.
Prior art designs of telescopic ladder assemblies have already been disclosed as early as 1929 in the US patent 1712942 (Smith) and 1940 in the US patent 2194856. A more recent design is for example disclosed in W02009057995 (Lampe). US1712942 and US2194856 each disclose a telescopic ladder with the actuators in the form of pin shaped finger pieces. In US1712942 the actuators extend through a slot in the bottom wall of the rung. In US2194856 the actuators are provided in the bottom side recess of a U-shaped rung. In both designs, the finger pieces only extend a slight distance below the rungs, which impedes the ease of engaging and manipulating the finger pieces, more in particular impedes operating them with a a single hand, e.g. by thumb and index finger. W02009057995 discloses a telescopic ladder in which in that the actuators are arranged centrally on the front side of the rung so as to be operable simultaneously with a single hand. The front wall of the rung has an elongated recessed portion over the length thereof and the actuators are arranged in said recessed portion. Arranging the actuators in the elongated recessed portion has the advantage that the actuators are generally protected from the feet of a person on the ladder, yet can have a suitable thickness to be operated by a single hand, e.g. by thumb and index finger.
The present invention aims to provide an improved ladder assembly, or at least a useful alternative, that facilitates user actuation of the manually operable release actuators for the purpose of operating the latch mechanisms and preferably allows for better handling of a ladder assembly in the collapsed state.
According to the invention, this feature is achieved by a telescopically extendable and collapsible ladder assembly of the type described in the preamble of claim 1, which is characterized in that the top rung of the bottom ladder section is at its bottom side provided with a centrally arranged grip element, the grip element including a front wall, a back wall, as well as a bottom wall extending between a bottom end of the front wall and a bottom end of the back wall, wherein the bottom wall of the grip element extends substantially parallel to the bottom wall of the top rung and provides a grip surface at a distance from the bottom wall of the top rung, which grip surface allows for engaging the collapsed ladder by hand using said grip surface; wherein the grip element forms a housing for the manually operable release actuators of the bottom ladder section, which manually operable release actuators are accessible at lateral sides of the grip element, preferably such that the two manually operable release actuators are operable simultaneously with a single hand of the user, which manually operable release actuators extend through a slot in the bottom wall of the rung into the interior of the rung, each of said release actuators being connected to a linkage member, e.g. a linkage rod, which extends inside the rung to a latch mechanism at the outer end of the rung, and which manually operable release actuators are each movable, parallel to the front wall and the back wall of the grip element and along the bottom wall of the rung, between a rest position and an actuated positon, to allow for manually operating the latch mechanisms and unlocking the stile members of the adjacent higher ladder section by pushing the manually operable release actuators towards each other and into the grip element.
Integrating the actuators in a grip element located below the rung has the advantage that the actuators are generally protected from the feet of a person mounting the ladder, yet can have freely accessible grip surface of a suitable height to be operated by a single hand, e.g. by thumb and index finger, and allow for engaging the rung at the bottom side by hand to carry the ladder when in a collapsed state without pinching the fingers and/or risk multiple fingers getting clamped between the two actuators.
It has furthermore been found that providing a grip element that increases the cross section of the rung is especially comfortable when engaging the rung by hand to carry the collapsed ladder assembly. To carry the ladder, rung of the ladder is typically engaged such that the bottom side of the rung rests in the hand, more in particular the inside of the fingers which is a particular delicate area of the hand. Providing a grip element according to the invention, which protrudes relative to the bottom surface of the rung, allows for supporting the ladder with the fingers of the hand while resting the grip element and/or the rung against the palm of the hand. This provides additional stability which in turn enhances the feeling of comfort with the person carrying the ladder.
Thus, the present invention provides an improved ladder assembly, or at least a useful alternative, that facilitates user actuation of the manually operable release actuators for the purpose of operating the latch mechanisms and allows for better handling of a ladder assembly in the collapsed state.
In an embodiment according to the invention the manually operable release actuators preferably are bar-shaped, having a longitudinal axis extending parallel to a longitudinal axis of the rung, and have a grip surface at an actuating end for pushing the actuator into the grip element, and a grip surface at their bottom side that essentially forms an extension of the grip surface of the grip element. Due to their bar shape, the release actuators essentially form an extension of the grip element.
Furthermore, when in their rest positon, the manually operable release actuators are accessible at lateral sides of the housing, in an embodiment extend at opposite sides out of the grip element, and are to be pushed into the housing to unlock the stile members of the adjacent higher ladder section. One end of the bar shaped actuator is the actuating end, i.e. the end to be engaged by a user when pushing the actuator into the grip element. The other end of the bar shaped actuator is located inside the housing, even when the actuator is in its rest position. In a further embodiment, the manually operable release actuators are bar shaped, and have, between the actuating end and the other end, a substantially continuous cross section with a shape complementary to the shape of the openings in the grip element. Thus, when the actuator is pushed into the housing, there is no risk of elements, for example a finger, getting stuck between a part of the actuator and the grip element.
In an embodiment, the top bar shaped release actuators are located adjacent the bottom wall of the rung, such that when engaged by hand when the collapsed ladder assembly is carried, they contact the bottom wall of the rung and thus enable direct force transfer, caused by the weight of the ladder assembly, from release actuator to rung.
In a further preferred embodiment, the bottom side of the bar shaped release actuators has a shape similar to the shape of the bottom side of the grip element, both can for example be barrel shaped, to further complement the grip surface of the grip element.
In an embodiment, the actuating end of the manually operable release actuators, i.e. the end providing the grip surface to be engaged by a user when pushing the actuator into the grip element, has, when seen in a bottom view, a curved surface. In such an embodiment, the grip surface of the manually operable release actuators is curved towards the front and the back of the grip element, such that, when seen in bottom view, the actuating end for pushing the actuator has a semi circular or semi oval shape. Thus, there is no sharp angled transition between the grip surface and the front surface of the bar shaped actuator. This facilitates engagement with a single hand, in particular when engaging the respective contact surfaces with thumb and index finger, and reduced peak pressures in those fingers at the transition area between contact surface and front surface of the manually operable release actuators.
The grip surfaces of the release actuators and the grip element are preferably provided with a grip enhancement in the form of, for example, a web of rib shaped protrusions, recesses, providing a flexible and/or rough surface layer, etc..
In an embodiment the grip element is mounted against the bottom wall of the top rung. In such an embodiment the top end of the front wall and the back wall of the grip element abut the bottom wall of the top rung.
In an alternative embodiment, the front wall and the back wall of the grip element overlap with the front wall and the back wall of the rung, such that the grip area provided by the grip element overlaps with the front and back of the rung. Thus there is no risk of a slid between the grip surface defined by the grip element and the bottom wall of the top rung, in which skin or fabric met get pinched when lifting the ladder assembly by hand.
In a further embodiment, the manually operable release actuators are bar shaped and have a width in a direction perpendicular to the front wall and the back wall of the grip element, and wherein the width of the bar shaped release actuator is substantially similar to the width of the rung to which the grip element is mounted.
In an embodiment, the Grip element comprises a U-shaped profile that forms the front wall, back wall, and bottom wall of the grip element. The U-shaped profile can be mounted directly onto the rung, for example using nuts and bolts, rivets, or click fingers engaging openings provided in the rung, etc. In a further embodiment, the U-shaped profile is combined with other elements, for example a base element that is to be mounted on the rung and in turn forms a mount for the U-shaped profile.
Preferably, the grip element is made out of plastic using the injection moulding technique. In an embodiment, the grip element is made out of a plastic material using the injection moulding technique, preferably the grip element is an injection moulded essentially U-shaped element, which U-shaped element comprises the front wall, the back wall and the bottom wall of the grip element. In an alternative embodiment, the grip element comprises a U-shaped profile, preferably an extruded aluminium U-shaped profile, the profile including the front and wall and the back wall and the bottom wall of the grip element. Thus a substantially U-shaped element can be provided which is to be mounted to the rung, for example by way of click fingers that engage openings in the rung, and/or screws, bolts or rivets.
The manually operable release actuators are preferably made out of plastic using the injection moulding technique. In an embodiment, the actuators are box shaped, having a bottom, four walls and an open top, and are mounted in the grip element with the open top facing the bottom wall of the rung.
The grip element, more in particular the front wall, the back wall and the bottom wall of the grip element, define a housing volume for receiving the manually operated actuators when pushed into their actuated position. In an embodiment, the slot or slots, through which the manually operable release actuators extend into the interior of the rung are located in the central area of the rung that is covered by the grip element and the actuators when in their actuated positon. Thus, the slots are covered independent of the position of the manually operable release actuators, and therefore protected from the surrounding environment, more in particular from foreign elements from entering the slots and hampering the movement of the actuators and/or the functioning of the latch mechanisms located in the rung.
In an embodiment, the manually operable release actuators each have an extension for coupling the actuator with the linkage member, for example includes a snap provision adapted to snap around a rod-shaped linkage member. Preferably, the extensions and the slots are dimensioned such that, during assembly, the extensions can be inserted into the slots to be coupled with the linkage members.
In an embodiment, the latch mechanisms and/or the actuators are provided with one or more spring elements, such as helical springs, that bias the release actuators towards their rest positions. Thus, a release actuator is moved back into it’s extend position by the spring elements, after it has been pushed into the grip element by the user to unlock the stile members of the adjacent higher ladder section. In a further embodiment, the latch mechanisms provided in the top rung each include a spring biased locking element, for example a locking pin, which spring element also functions as the spring element that biases the release actuator into its rest position.
In an embodiment, the grip element extends at least 8 mm below the bottom wall of the top rung, preferably between 10 mm and 25 mm below the bottom wall of the top rung, for example 20 mm below the bottom wall of the top rung.
In an embodiment, the grip element, more in particular the grip surface provided by the grip element, has a length parallel to a longitudinal direction of the rung, which length is at least 40 mm, is preferably between 50 mm and 80 mm, preferably is 75 mm.
In an embodiment, the manually operable release actuators have a height of at least 6 mm, preferably have a height between 10mm and 25mm, for example have a height of 17mm.
In an embodiment, the manually operable release actuators have a width in a direction perpendicular to the front wall and the back wall of the grip element, and wherein the width of the bar shaped release actuator is at least 5 mm, preferably at least 10 mm, more preferably is between 15 mm and 40 mm, for example is 35 mm.
In an embodiment, the manually operable release actuators, at the end facing the rung, have a grip surface for engagement by a user, and wherein the distance between those grip surfaces, when the release actuators are in a rest position, is at least 80mm preferably is between 90 mm and 140mm, for example is 110mm.
In an embodiment, the manually operable release actuators, when the release actuators are each in their rest position, protrude at opposite sides of the grip element at least 5 mm from the grip, preferably at least 10 mm, more preferably between 12 and 20 millimetres, for example 17mm.
In an embodiment, all the latch mechanisms provided at each end of the rungs of the intermediate ladder sections are automatic latch mechanisms, of which the release actuators are arranged for cooperating with an actuator pin provided on the rung of an adjacent lower ladder section for automatically unlocking the automatic latch mechanism when the ladder section is moved in a collapsing direction towards the adjacent lower ladder section. In such an embodiment, only manual operation of the manual operably release actuators is need for collapsing the ladder assembly. Especially in combination with single hand use, this allows for easy handling of the ladder assembly.
In an embodiment, the rung of each intermediate ladder section is provided with one or more manually operable release actuators connected to the latch mechanisms of the rung to allow for manual unlocking of the stile members of said adjacent higher ladder section by a user in order to allow for a section-by-section manually release and collapsing of the ladder assembly. In a further embodiment, the rungs are provided with both automatic latch mechanisms of which the release actuators are arranged for cooperating with an actuator pin provided on the rung of an adjacent lower ladder section, as described above, and manually operable release actuators.
In an embodiment each ladder rung is connected at each end thereof to the stile member via a connector member, the locking pin being reciprocally supported in the connector member, e.g. with a spring between the locking pin and the connector member to bias the pin toward its locking position, and each connector member being provided with an actuator connected to the locking pin, e.g. to allow actuation thereof by a thumb of a user or to allow for actuation by contact with a lower positioned ladder section.
The invention furthermore provides a loft ladder including a ladder assembly according to the invention.
The invention furthermore provides a stepladder having a first stepladder assembly and a second stepladders assembly hinged to one another so as to be in a storage position folded against one another and an operative position similar to an inverted V at least one of the stepladder assemblies being a ladder assembly according to the invention.
The invention furthermore provides a work platform including a ladder assembly according to the invention.
Advantageous embodiments of the ladder assembly according to the invention are disclosed in the subclaims and in the description, in which the invention is further illustrated and elucidated on the basis of a number of exemplary embodiments, of which some are shown in the schematic drawing.
In the drawing
Fig. 1 shows a frontal view of a telescopic extendable and collapsible ladder assembly according to the invention, in an extended condition;
Fig. 2 shows a perspective view in close up of a top rung of a bottom ladder section of the ladder assembly of Fig. 1;
Fig. 3 shows partial frontal view in cross section of the top rung of fig. 2;
Fig. 4 shows frontal view in cross section of the top rung of fig. 2; and
Fig. 5 shows a frontal view in cross section of the top rung of fig. 2 with manual operable actuators in an actuated position.
Fig. 1 shows a frontal view of a telescopically extendable and collapsible ladder assembly 1 according to the invention, in an extended condition. The ladder assembly 1 comprises at a top ladder section 2, a bottom ladder section 3, and multiple intermediate ladder sections 4.
The top ladder section 2 and each of the one or more intermediate ladder sections 4 each have two tubular stile members 5 arranged parallel to each other and interconnected at a top end by a ladder rung 6 to form a U-shaped ladder section. The bottom ladder section 3 has two tubular stile members 5 arranged parallel to each other and interconnected by a top ladder rung 6' and a bottom ladder rung 6”.
The bottom ladder section 3 is the ladder sections configured for, during use of the ladder, assembly, forming the base of the extended ladder 1. Typically, the bottom end of the tubular stile members 5 of the bottom ladder section 3 are provided with plastic or rubber “feet’ that provide a non slippery contact with the support surface onto which the ladder has been mounted.
In the embodiment shown, the ladder rungs 6,6',6" are each made from an extruded aluminium tubular profile, the profile including a top wall 7, a bottom wall 8, as well as a front wall 9 and a back wall 10 extending between the top wall and the bottom wall
The stile members 5 of the top ladder section 2 and the intermediate ladder sections 4 are telescopically inserted into the stile members of an adjacent lower ladder section, so that the one or more intermediate ladder sections and the top ladder section can be collapsed in a collapsing direction towards the bottom ladder section 2.
The top rung 06' of the bottom ladder section 3 and the ladder rung 6 of each of the multiple intermediate ladder sections 4 are provided at each end with an automatic latch mechanism 11. The latch mechanisms are provided inside the ladder rungs, and are therefore not visible in Fig. 1 but is depicted in the cross sectional views of Fig. 3 and 4. The automatic latch mechanism 11 is adapted for automatically locking the stile members 5 of the adjacent higher ladder section in a fully extended position of the adjacent higher ladder section. It is observed that these types of latch mechanisms are as such known in the prior art, and therefore are not discussed in great detail herein.
The automatic latch mechanisms 11 of the multiple intermediate ladder sections 4 are each associated with a release actuator 12 for unlocking the stile members 5 of an adjacent higher ladder section in order to allow for automatic release and collapsing of the ladder assembly 1.
The automatic latch mechanisms 11 of the bottom ladder section 3 are each connected with a manually operable release actuator 13 for unlocking of the stile members 5 of the adjacent higher ladder section, i.e. an intermediate ladder section 4, by a user in order to allow for a manually release and collapsing of the ladder assembly 1
According to the invention, the top rung 6'of the bottom ladder section 3 is at its bottom side provided with a centrally arranged grip element 14. The grip element 14 including a front wall 15, a back wall 16, as well as a bottom wall 17 extending between a bottom end of the front wall and a bottom end of the back wall of the grip element.
The bottom wall 17 of the grip element 14 extends substantially parallel to the bottom wall 8 of the top rung 6' and provides a grip surface 18 at a distance from the bottom wall 8 of the top rung 6', which grip surface 18 allows for engaging the collapsed ladder assembly 1 by hand using said grip surface. The grip element 14 furthermore forms a housing for the manually operable release actuators 13 of the bottom ladder section 3.
The manually operable release actuators 13 extend at opposite sides out of the grip element 14. The manually operable release actuators 13 are each movable, parallel to the front wall 15 and the back wall 16 of the grip element 14 and along the bottom wall 8 of the rung 6’, between an rest position, shown in figs. 3 and 4, and an actuated positon. At the end facing the rung, the manually operable release actuators 13 have a grip surface 20 for engagement by a user. The grip surface, at least at a central area thereof, extends substantially perpendicular to a longitudinal axis of the rung of the ladder. In the embodiment shown, the two manually operable release actuators 13 are operable simultaneously with a single hand of the user.
The manually operable release actuators 13 extend through a slot in the bottom wall 8 of the ladder rung 6’ into the interior of the rung. Each of the actuators 13 is connected to a linkage member, in the embodiment shown a linkage rod 19, which extends inside the ladder rung 6’ to a latch mechanism 11 at the outer end of the rung. Thus, by pushing the manually operable release actuators 13 towards each other and into the grip element 14, the latch mechanisms 11 are operated and the stile members 5 of the adjacent higher ladder section 4 are unlocked.
In the embodiment shown, the latch mechanisms 11 provided in the top rung 6’ each include a spring biased locking element, in particular a locking pin 21, which is configured for locking the tubular stile members relative to each other and thus secure the ladder assembly 1 in its extended position. Since the latch mechanisms 11, more in particular the locking pin 21 of the latch mechanisms, are coupled to the manually operable actuators 13 via a linkage member, in the embodiment shown linkage rod s19, the spring elements 22 also biases the release actuators 13 into their rest positions. Thus, a release actuator 13 is moved back into it’s extend position by the spring elements 22, after it has been pushed into the grip element 14 by the user to unlock the stile members 5 of the adjacent higher ladder section.
In an alternative embodiment, the actuators are provided with one or more spring elements, instead off or in addition to spring elements provided in the latch mechanisms, to bias the release actuators towards their respective rest positions. For example, a biased spring element can be provided in the grip element, with its opposite ends contacting the respective manually operable release actuators, to push them out of the housing into their rest positions.
The invention provides manually operable actuating means with a contact surface that extends substantially perpendicular to the movement of the actuator, which provides optimal grip. In practice, the manually operable release actuators thus function as push buttons provided at opposite ends of the grip element.
The invention furthermore allows for providing the actuators with a large contact area, which reduces the peak pressures in the fingers when pushing the actuators in their actuating direction. This is possible because the actuators are provided below the rung, instead of at the front of the rung, and are integrated in the grip element. The protruding actuators thus do not obstruct movement of a person climbing the ladder and are at the same time protected against accidental contact with the feet of a user.
In an embodiment each ladder rung is connected at each end thereof to the stile member via a connector member, the locking pin being reciprocally supported in the connector member, e.g. with a spring between the locking pin and the connector member to bias the pin toward its locking position.
The skilled person will appreciate that the body of the connector can be provided with a passage for a locking pin (which can form an extension of or be connected to the mentioned rod attached to the slide actuators) and allows to accommodate a spring for biasing said locking pin towards a locked position (commonly the stile member having an associated locking pin opening to receive said locking pin in extended state of the ladder section).
In an embodiment the one or more actuators are arranged on the front side of the rungs of the intermediate ladder sections, e.g. two actuators, each connected to a corresponding locking pin, arranged centrally on the front side of the rung so as to be operable simultaneously with a single hand.
The tubular stile members may have a circular cross-section, but other cross-sectional shapes, e.g. square, rectangular (rounded), triangular, delta shaped, oval, elliptical, etc. are also possible.
In the particular embodiment shown, the manually operable release actuators 13 are barshaped, having a longitudinal axis extending parallel to a longitudinal axis of the top rung 6, the bar shaped manually operable release actuators 13 have a grip surface 20 at an actuating end for pushing the release actuator into the grip element 14.
In the particular embodiment shown, the grip surface 20 of the manually operable release actuators 13 is curved towards the front and the back of the grip element 14, such that, when seen in bottom view, the actuating end for pushing the actuator has a semi circular or semi oval shape. in the embodiment shown, see figs. 2 and 4, the front wall and a the back wall of the grip element overlap with the front wall and the back wall of the rung, such that the grip area provided by the grip element overlaps with the front and back of the rung.
In the embodiment shown, the manually operable release actuators 13 extend though slots into the interior of the rung 6,6’, which slots are located in the central area of the rung. The slots and the grip element, including the manually operable release actuators are dimensioned such that the slots are covered by the grip element and the release actuators when in their actuated position, see for example Fig. 3 and fig. 5.
In the exemplary embodiment shown, the manually operable release actuators 13 each have a an extension 23 for coupling the actuator with the linkage member, for example includes a snap provision adapted to snap around a rod-shaped linkage member. 9. Ladder assembly according to one or more of the preceding claims, wherein the latch mechanisms and/or the actuators are provided with one or more spring elements, such as helical springs, that bias the release actuators towards their respective rest positions.
REFERENCE SIGNS 01 ladder assembly 02 top ladder sections 03 bottom ladder section 04 intermediate ladder sections 05 tubular stile members 06 ladder rung 06' top ladder rung bottom section 06” bottom ladder rung bottom section 07 top wall ladder rung 08 bottom wall ladder rung 09 front wall ladder rung 10 back wall ladder rung 11 latch mechanism 12 release actuator 13 manually operable release actuator 14 grip element 15 front wall grip element 16 back wall grip element 17 bottom wall grip element 18 grip surface grip element 19 linkage rod 20 grip surface manually operable release actuator 21 locking pin 22 spring element latch mechanism 23 extension
Claims (20)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2013339A NL2013339B1 (en) | 2014-08-18 | 2014-08-18 | A telescopic ladder assembly. |
| PCT/NL2015/050579 WO2016028147A2 (en) | 2014-08-18 | 2015-08-17 | Telescopic ladder assembly |
| CN201580050755.5A CN107075905B (en) | 2014-08-18 | 2015-08-17 | Telescopic ladder assembly |
| CN201910455556.2A CN110344747B (en) | 2014-08-18 | 2015-08-17 | Telescopic ladder assembly |
| US15/502,251 US10161184B2 (en) | 2014-08-18 | 2015-08-17 | Telescopic ladder assembly |
| EP15790298.2A EP3183410B1 (en) | 2014-08-18 | 2015-08-17 | Telescopic ladder assembly |
| EP19187861.0A EP3581754B1 (en) | 2014-08-18 | 2015-08-17 | Telescopic ladder assembly |
| US16/183,999 US10480245B2 (en) | 2014-08-18 | 2018-11-08 | Telescopic ladder assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2013339A NL2013339B1 (en) | 2014-08-18 | 2014-08-18 | A telescopic ladder assembly. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2013339B1 true NL2013339B1 (en) | 2016-09-22 |
Family
ID=51753444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2013339A NL2013339B1 (en) | 2014-08-18 | 2014-08-18 | A telescopic ladder assembly. |
Country Status (1)
| Country | Link |
|---|---|
| NL (1) | NL2013339B1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5738186A (en) * | 1994-03-01 | 1998-04-14 | Foxdale Developments Limited | Extensible ladder |
| CN201273132Y (en) * | 2008-09-12 | 2009-07-15 | 胡正江 | Novel extension ladder |
| CN202194553U (en) * | 2011-07-18 | 2012-04-18 | 沈小秋 | Lock mechanism and extension ladder with same |
-
2014
- 2014-08-18 NL NL2013339A patent/NL2013339B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5738186A (en) * | 1994-03-01 | 1998-04-14 | Foxdale Developments Limited | Extensible ladder |
| CN201273132Y (en) * | 2008-09-12 | 2009-07-15 | 胡正江 | Novel extension ladder |
| CN202194553U (en) * | 2011-07-18 | 2012-04-18 | 沈小秋 | Lock mechanism and extension ladder with same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Lapsed because of non-payment of the annual fee |
Effective date: 20210901 |