EP2090740B1 - A step stool - Google Patents
A step stool Download PDFInfo
- Publication number
- EP2090740B1 EP2090740B1 EP08075109A EP08075109A EP2090740B1 EP 2090740 B1 EP2090740 B1 EP 2090740B1 EP 08075109 A EP08075109 A EP 08075109A EP 08075109 A EP08075109 A EP 08075109A EP 2090740 B1 EP2090740 B1 EP 2090740B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- latch member
- latch
- step stool
- crossbar
- use position
- 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.)
- Active
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- 230000033001 locomotion Effects 0.000 claims description 8
- 210000001364 upper extremity Anatomy 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 1
Images
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
- E06C1/39—Ladders having platforms; Ladders changeable into platforms
- E06C1/393—Ladders having platforms foldable with the ladder
Definitions
- the present invention relates to a step stool having a folding frame and multiple steps that will move simultaneous upon movement of the folding frame between its opened use position and its collapsed storage position.
- step stools are provided with a latch mechanism that retains the step stool in its opened use position. Only deliberate manual operation of the latch mechanism can release the latch member, so that a sudden and undesired collapse of the step stool is impossible.
- a step stool wherein the upper step has a step body with a notch in the rear portion of the step body. With this notch the latch member is arranged in pivotal manner so that a user can grip the member with a hand, pull it upward and so effect release of the latch member from the crossbar.
- a drawback of the US 6 902 035 is the complexity of the step body to create the notch and arrange the latch member in said notch.
- a further drawback is that the latch member has a major upper face which extends as a continuation of the upper surface of the step. Thereby a user standing on the step stool is likely to place a foot on the latch member, causing it to be overloaded, worn, or malfunction.
- a step stool wherein the latch member is fitted through an opening in a downward depending skirt of the upper step body.
- the user In order to disengage the latch member from the crossbar, the user has to press down the actuation portion of the latch member.
- collapsing of the ladder is usually done by the user through pulling the rear of the upper step towards him, the user is effectively required to make two motions in opposite directions at the same time, which is awkward.
- the present invention aims to provide an improved step stool with manually releasable latch mechanism.
- the invention aims to provide design of the upper step and associated latch mechanism that can be efficiently manufactured at low costs, which is important as step stools are mass produced items. Also the invention aims to provide a latch mechanism that is easy to operate by the user upon collapse of the step stool and will remain reliable over the lifetime of the step stool.
- the present invention provides a step stool according to claim 1, the preamble thereof based on US 6427805 , wherein the upper step comprises a metal step body having a platform and peripheral skirt extending below and around said platform, and wherein the pivotal latch member is hinged to the lower side of the step at a position inside the contour of the peripheral skirt, wherein the latch member has a bridge portion extending from said latch face rearward, underneath the peripheral skirt, to an actuation portion of said latch member, said actuation portion extending adjacent the outer side of the peripheral skirt so as to be manually engaged by a users hand.
- latch mechanism allows for intuitive actuation by the user and at the same time allows for an attractive design of the latch mechanism and upper step from a manufacturing point of view. Also it allows to create a latch mechanism that will be reliable throughout the life time of the step stool.
- step ladder according to the invention is mentioned in the subclaims and will be explained in the description of a preferred embodiment.
- step stool 1 A preferred embodiment of the step stool 1 according to the invention will now be explained referring to the figures 1-5 .
- the step stool 1 has a folding frame with a pair of front legs 2a, 2b and a pair of rear legs 3a, 3b.
- the rear are coupled to the front legs at their upper ends in this example, via hinges 4a, b, so that the front and rear legs are relatively pivotable between an opened use position, wherein the front and rear legs in general define an A in side view of the step stool, and a collapsed storage position, wherein the front and rear legs are essentially parallel.
- This step stool includes an upper step 10 and two lower steps 11, 12, each step 10,11,12 being arranged between and coupled to the front legs 2a,b for pivotable movement between a horizontal use position and a storage position, each step being adapted to support a person thereon.
- front legs are interconnected at spaced positions by pivot shafts 2c (visible in figures 2, 3 ) which each rotatably support the front portion of a step.
- pivot shafts 2c visible in figures 2, 3
- legs 2a, b are here connected by a hoop portion at their upper ends.
- a linkage member arrangement which effects simultaneous movement of the steps 10-12 as the frame is folded to move between the use position and the collapsed position.
- the linkage member arrangement includes one or more linkage members 7 extending between the rear legs on the one hand and a step (here step 11) on the other hand, each linkage member 7 being hinged at its ends.
- one or more linkage members 8 extend between the steps 11,12,13, each connection being pivotal.
- the frame includes a crossbar 9 extending between the rear legs 2a,b and arranged so that a rear portion of the upper step 10 rests on said crossbar 9 when said upper step 10 is in its use position (see figure 2 ).
- a further crossbar 9b is fitted in this example at a lower level between the rear legs.
- the upper step 10 is provided with a manually releasable latch mechanism including a pivotal latch member 20 having a latch face 20e that is arranged to catch under the crossbar 9 when the frame is folded to its use position so as to retain the step stool 1 in the use position (see figure 2 ).
- the pivotal latch member 20 is operable manually by a user to disengage the latch member 20 from the crossbar 9 and to fold the frame to the storage position. This can already be appreciated from figures 2-4 .
- the upper step 10 has a metal step body with a platform 10a and peripheral skirt 10b extending below and around said platform 10a.
- the upper step metal body is made from sheet metal by deep drawing.
- reinforcement strip 10c is welded transversely under the platform.
- the pivotal latch member 20 is hinged to the lower side of the upper step 10 at a position inside the contour of the peripheral skirt 10b as can be seen in the figures 2,3 .
- the latch member 20 has a bridge portion 20b extending from said latch face 20e rearward, underneath the peripheral skirt 10b, to an actuation portion 20c of said latch member 20.
- the actuation portion 20c extends adjacent the outer side of the peripheral skirt 10b so as to be manually engagable by a users hand, which grips from above over the actuation portion 20c.
- the latch member 20 includes a bore 20d for a pivot pin 23, the pivot pin 23 extending below the platform 10a.
- two tabs 10e have been folded downwards from the sheet metal of the platform 10a, the tabs 10e supporting the pivot pin 23 at opposed ends.
- the latch mechanism includes a spring (not shown here, in this example the spring will be arranged around the pivot pin 23 as a torsion spring engaging the underside of the upper step and the latch member) urging the latch member 20 to catch under the crossbar 9.
- a spring (not shown here, in this example the spring will be arranged around the pivot pin 23 as a torsion spring engaging the underside of the upper step and the latch member) urging the latch member 20 to catch under the crossbar 9.
- peripheral skirt 10b here is continuous all around, at least has a continuous rear portion, which enhances production of the step and gives good stability of the step at low costs. Also, which the same effects, the rear portion of the skirt 10b has a uniform height over its length. As is preferred the rear portion, at least in the vicinity of the latch member 20 is free of any notches or openings as in prior art designs.
- the actuation portion 20c - with the step stool in use position - has an upper end below the upper face to the upper step, as can be seen in figure 2 .
- the actuation portion 20c includes depressions to accommodate one or more fingers of the user's hand.
- the latch member 20 is a monolithic member, preferably of plastic.
Landscapes
- Ladders (AREA)
- Saccharide Compounds (AREA)
Abstract
Description
- The present invention relates to a step stool having a folding frame and multiple steps that will move simultaneous upon movement of the folding frame between its opened use position and its collapsed storage position.
- For safety reasons, in many countries on a mandatory basis, step stools are provided with a latch mechanism that retains the step stool in its opened use position. Only deliberate manual operation of the latch mechanism can release the latch member, so that a sudden and undesired collapse of the step stool is impossible.
- In
US 6 902 035 a step stool is disclosed wherein the upper step has a step body with a notch in the rear portion of the step body. With this notch the latch member is arranged in pivotal manner so that a user can grip the member with a hand, pull it upward and so effect release of the latch member from the crossbar. - A drawback of the
US 6 902 035 is the complexity of the step body to create the notch and arrange the latch member in said notch. A further drawback is that the latch member has a major upper face which extends as a continuation of the upper surface of the step. Thereby a user standing on the step stool is likely to place a foot on the latch member, causing it to be overloaded, worn, or malfunction. - The same drawbacks are present in the
US 6 427 805 andUS 6 550 579 step stools. - In
US 6 026 933 a step stool is disclosed wherein the latch mechanism is only accessible via openings in the upper face of the upper step. This is awkward for the user of the step stool. - In
US 6 390 237 a step stool is disclosed, wherein the latch member is fitted through an opening in a downward depending skirt of the upper step body. In order to disengage the latch member from the crossbar, the user has to press down the actuation portion of the latch member. As collapsing of the ladder is usually done by the user through pulling the rear of the upper step towards him, the user is effectively required to make two motions in opposite directions at the same time, which is awkward. - The present invention aims to provide an improved step stool with manually releasable latch mechanism.
- In particular the invention aims to provide design of the upper step and associated latch mechanism that can be efficiently manufactured at low costs, which is important as step stools are mass produced items. Also the invention aims to provide a latch mechanism that is easy to operate by the user upon collapse of the step stool and will remain reliable over the lifetime of the step stool.
- The present invention provides a step stool according to claim 1, the preamble thereof based on
US 6427805 , wherein the upper step comprises a metal step body having a platform and peripheral skirt extending below and around said platform, and wherein the pivotal latch member is hinged to the lower side of the step at a position inside the contour of the peripheral skirt, wherein the latch member has a bridge portion extending from said latch face rearward, underneath the peripheral skirt, to an actuation portion of said latch member, said actuation portion extending adjacent the outer side of the peripheral skirt so as to be manually engaged by a users hand. - As the skilled person will readily appreciate this design of the latch mechanism allows for intuitive actuation by the user and at the same time allows for an attractive design of the latch mechanism and upper step from a manufacturing point of view. Also it allows to create a latch mechanism that will be reliable throughout the life time of the step stool.
- Further preferred details of the step ladder according to the invention are mentioned in the subclaims and will be explained in the description of a preferred embodiment.
- In the drawings:
-
Fig. 1 shows a preferred embodiment of the step stool according to the invention, -
Fig. 2 the upper step of the step stool offigure 1 in horizontal use position, wherein the latch mechanism engages the crossbar, -
Fig. 3 the upper step as the latch mechanism is manually operated and has been released from the crossbar, the upper platform having been tilted forward in order to collapse the step stool, -
Fig. 4 the upper step from above during the collapse of the step stool, and -
Fig. 5 the latch member of the step stool offigures 1-4 . - A preferred embodiment of the step stool 1 according to the invention will now be explained referring to the
figures 1-5 . - The step stool 1 has a folding frame with a pair of
front legs rear legs hinges 4a, b, so that the front and rear legs are relatively pivotable between an opened use position, wherein the front and rear legs in general define an A in side view of the step stool, and a collapsed storage position, wherein the front and rear legs are essentially parallel. - This step stool includes an
upper step 10 and twolower steps 11, 12, eachstep front legs 2a,b for pivotable movement between a horizontal use position and a storage position, each step being adapted to support a person thereon. - In this example the front legs are interconnected at spaced positions by
pivot shafts 2c (visible infigures 2, 3 ) which each rotatably support the front portion of a step. Also thelegs 2a, b are here connected by a hoop portion at their upper ends. - As is common in step stools a linkage member arrangement is provided, which effects simultaneous movement of the steps 10-12 as the frame is folded to move between the use position and the collapsed position. Here the linkage member arrangement includes one or more linkage members 7 extending between the rear legs on the one hand and a step (here step 11) on the other hand, each linkage member 7 being hinged at its ends. Furthermore one or
more linkage members 8 extend between thesteps 11,12,13, each connection being pivotal. Upon collapse of the step stool the steps 10-12 are tilted to their vertical or storage position, here essentially parallel to the plane of the front legs. - The frame includes a
crossbar 9 extending between therear legs 2a,b and arranged so that a rear portion of theupper step 10 rests on saidcrossbar 9 when saidupper step 10 is in its use position (seefigure 2 ). Afurther crossbar 9b is fitted in this example at a lower level between the rear legs. - The
upper step 10 is provided with a manually releasable latch mechanism including apivotal latch member 20 having alatch face 20e that is arranged to catch under thecrossbar 9 when the frame is folded to its use position so as to retain the step stool 1 in the use position (seefigure 2 ). - The
pivotal latch member 20 is operable manually by a user to disengage thelatch member 20 from thecrossbar 9 and to fold the frame to the storage position. This can already be appreciated fromfigures 2-4 . - The
upper step 10 has a metal step body with aplatform 10a andperipheral skirt 10b extending below and around saidplatform 10a. As is preferred the upper step metal body is made from sheet metal by deep drawing. For reinforcement isreinforcement strip 10c is welded transversely under the platform. - The
pivotal latch member 20 is hinged to the lower side of theupper step 10 at a position inside the contour of theperipheral skirt 10b as can be seen in thefigures 2,3 . - The
latch member 20 has abridge portion 20b extending from saidlatch face 20e rearward, underneath theperipheral skirt 10b, to anactuation portion 20c of saidlatch member 20. Theactuation portion 20c extends adjacent the outer side of theperipheral skirt 10b so as to be manually engagable by a users hand, which grips from above over theactuation portion 20c. - As can be seen, in this practical embodiment, the
latch member 20 includes abore 20d for apivot pin 23, thepivot pin 23 extending below theplatform 10a. As is preferred twotabs 10e have been folded downwards from the sheet metal of theplatform 10a, thetabs 10e supporting thepivot pin 23 at opposed ends. - The latch mechanism includes a spring (not shown here, in this example the spring will be arranged around the
pivot pin 23 as a torsion spring engaging the underside of the upper step and the latch member) urging thelatch member 20 to catch under thecrossbar 9. - When a user desires to collapse the step stool 1 all that is needed for the user is to grip the
actuation portion 20c and pull it upwards towards him. This simple action causes thelatch member 20 to disengage from thecrossbar 9 as themember 20 pivots about thepivot pin 23. Then thelatch member 20 comes to bear against the upper step body so that continued pulling by the user causes thestep 10 to tilt to its storage position, away from thecrossbar 9. Due to the linkage member arrangement this motion of theupper step 10 simultaneously causes the frame to fold and all other steps to move towards their storage position. - It will be appreciated that the
peripheral skirt 10b here is continuous all around, at least has a continuous rear portion, which enhances production of the step and gives good stability of the step at low costs. Also, which the same effects, the rear portion of theskirt 10b has a uniform height over its length. As is preferred the rear portion, at least in the vicinity of thelatch member 20 is free of any notches or openings as in prior art designs. - To avoid contact between the shoes of a person standing on the
upper step 10 and thelatch member 20, it is preferred that theactuation portion 20c - with the step stool in use position - has an upper end below the upper face to the upper step, as can be seen infigure 2 . - As is preferred, and as shown in
figures 2-4 , theactuation portion 20c includes depressions to accommodate one or more fingers of the user's hand. - As is preferred, and as shown in the
figures 2-5 , thelatch member 20 is a monolithic member, preferably of plastic.
Claims (10)
- A step stool comprising:- a folding frame having a pair of front legs (2a,b) and a pair of rear legs (3a,b), said rear legs being coupled to the front legs for pivotable movement between an opened use position and a collapsed storage position,- an upper step (10) and one or more lower steps (11,12), each step (10,11,12) being arranged between and coupled to the front legs (2a,b) for pivotable movement between a horizontal use position and a storage position, each step (10,11,12) being adapted to support a person thereon,- a linkage member arrangement (7, 8) effecting simultaneous movement of the steps (10-12) as the frame is folded to move between the use position and storage position,wherein the frame comprises a crossbar (9) extending between the rear legs (3a,b) and arranged so that a rear portion of the upper step (10) rests on said crossbar (9) when said upper step is in its use position,
the upper step (10) being provided with a manually releasable latch mechanism including a pivotal latch member (20) having a latch face (20a) that is arranged to catch under said crossbar (9) when the frame is folded to its use position so as to retain the step stool in said use position,
the pivotal latch member (20) being operable manually by a user to disengage the latch member (20) from the crossbar (9) and fold the frame to the storage position,
wherein the upper step (10) comprises a step body having a platform (10a) and peripheral skirt (10b) extending below and around said platform,
the latch member (20) having a bridge portion (20b) extending from said latch face (20a) rearward to an actuation portion (20c) of said latch member (20), said actuation portion (20c) being manually engagable by a users hand,
so that - with the step stool (1) in its use position - when the user pulls the actuation portion (20c) upwards the latch member (20) is released from the crossbar (9), the latch member (20) then engaging the step body, and further upward pulling causes the step stool (1) to move to its storage position
characterized in that
the step body of the upper step (10) is made of metal,
the pivotal latch member (20) is hinged to the lower side of the step body at a position inside the contour of the peripheral skirt (10b),
the bridge portion (20b) of the latch member (20) extends from the latch face (20a) rearward, underneath the peripheral skirt (10b), to the actuation portion (20c) of said latch member (20),
and said actuation portion (20c) extends adjacent the outer side of the peripheral skirt (10b) so as to be manually engagable by a users hand. - A step stool according to claim 1, wherein the peripheral skirt (10b) has a continuous rear portion.
- A step stool according to claim 1 or 2, wherein the step body is deep drawn from plate metal.
- A step stool according to claim 2, wherein the rear portion has a uniform height over its length.
- A step stool according to one or more of the preceding claims, wherein the latch member includes a bore for a pivot pin (23), the pivot pin extending below the platform.
- A step stool according to claim 5, wherein two tabs (10e) are folded downwards from the platform, the tabs supporting the pivot pin (23) at opposed ends.
- A step stool according to one or more of the preceding claims, wherein the actuation portion (20c) - with the step stool in use position - has an upper end below the upper face of the upper step (10).
- A step stool according to one or more of the preceding claims, wherein the actuation portion (20c) includes depressions to accommodate fingers of the user's hand.
- A step stool according to one or more of the preceding claims, wherein the latch member (20) is a monolithic member, preferably of plastic.
- A step stool according to one or more of the preceding claims, wherein the latch mechanism includes a spring urging the latch member (20) to catch under the crossbar.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT08075109T ATE483092T1 (en) | 2008-02-12 | 2008-02-12 | STEPLADDER |
DE602008002812T DE602008002812D1 (en) | 2008-02-12 | 2008-02-12 | stepladder |
EP08075109A EP2090740B1 (en) | 2008-02-12 | 2008-02-12 | A step stool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08075109A EP2090740B1 (en) | 2008-02-12 | 2008-02-12 | A step stool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2090740A1 EP2090740A1 (en) | 2009-08-19 |
EP2090740B1 true EP2090740B1 (en) | 2010-09-29 |
Family
ID=39639266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08075109A Active EP2090740B1 (en) | 2008-02-12 | 2008-02-12 | A step stool |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2090740B1 (en) |
AT (1) | ATE483092T1 (en) |
DE (1) | DE602008002812D1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104594794A (en) * | 2015-01-27 | 2015-05-06 | 宁波兴富工具有限公司 | Work ladder as working platform |
WO2023283538A1 (en) * | 2021-07-07 | 2023-01-12 | Dorel Home Furnishings, Inc. | Foldable step stool with fold-blocking lock |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2005635C2 (en) | 2009-11-06 | 2012-03-13 | Lampe Holding B V | A combined portable step stool and workpiece support device. |
DE202015100668U1 (en) * | 2015-02-11 | 2016-05-12 | Hailo-Werk Rudolf Loh Gmbh & Co. Kg | Device for securing a stepladder in an erected position |
USD860476S1 (en) | 2017-01-04 | 2019-09-17 | Tricam Industries, Inc. | Hinge for a multi-position ladder |
USD855833S1 (en) | 2017-01-04 | 2019-08-06 | Tricam Industries, Inc. | Ladder rail |
EP4161316A4 (en) * | 2020-06-04 | 2024-07-10 | Dorel Home Furnishings Inc | Kitchen helper folding step stool |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6026933A (en) | 1997-05-29 | 2000-02-22 | Cosco, Inc. | Step stool |
CA2341556C (en) | 1999-01-08 | 2005-09-20 | Cosco Management, Inc. | Folding step stool |
AU2727300A (en) | 1999-01-14 | 2000-08-01 | Franny Chen | Ladder step stool with latch |
CA2354996C (en) | 2000-08-11 | 2005-10-25 | Cosco Management, Inc. | Step stool |
US6902035B2 (en) | 2003-08-07 | 2005-06-07 | Cosco Management, Inc. | Step stool with step lock |
-
2008
- 2008-02-12 DE DE602008002812T patent/DE602008002812D1/en active Active
- 2008-02-12 EP EP08075109A patent/EP2090740B1/en active Active
- 2008-02-12 AT AT08075109T patent/ATE483092T1/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104594794A (en) * | 2015-01-27 | 2015-05-06 | 宁波兴富工具有限公司 | Work ladder as working platform |
WO2023283538A1 (en) * | 2021-07-07 | 2023-01-12 | Dorel Home Furnishings, Inc. | Foldable step stool with fold-blocking lock |
Also Published As
Publication number | Publication date |
---|---|
DE602008002812D1 (en) | 2010-11-11 |
EP2090740A1 (en) | 2009-08-19 |
ATE483092T1 (en) | 2010-10-15 |
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