WO2020169942A1 - Improved step ladder and support structure - Google Patents

Improved step ladder and support structure Download PDF

Info

Publication number
WO2020169942A1
WO2020169942A1 PCT/GB2020/000017 GB2020000017W WO2020169942A1 WO 2020169942 A1 WO2020169942 A1 WO 2020169942A1 GB 2020000017 W GB2020000017 W GB 2020000017W WO 2020169942 A1 WO2020169942 A1 WO 2020169942A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
support structure
stiles
sleeve
leg
Prior art date
Application number
PCT/GB2020/000017
Other languages
French (fr)
Inventor
Garry Mcdonald
Original Assignee
Garry Mcdonald
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GBGB1902205.2A external-priority patent/GB201902205D0/en
Priority claimed from GBGB1908710.5A external-priority patent/GB201908710D0/en
Application filed by Garry Mcdonald filed Critical Garry Mcdonald
Priority to GB2112043.1A priority Critical patent/GB2595396B/en
Publication of WO2020169942A1 publication Critical patent/WO2020169942A1/en

Links

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
    • E06C1/14—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
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/003—Indicating devices, e.g. user warnings or inclinators
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/42—Ladder feet; Supports therefor
    • E06C7/423—Ladder stabilising struts
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/42—Ladder feet; Supports therefor
    • E06C7/44—Means for mounting ladders on uneven ground

Definitions

  • the present invention relates to a support structure which facilitates an improvement in safety for those using height access apparatus. It also relates to improved height access apparatus.
  • step ladders There are many types of height access or working apparatus for example step ladders, extension ladders, podium steps, access towers, scaffolds, trestles and step up platforms.
  • This type of apparatus is used by tradesmen such as electricians, plumbers, painter and joiners when working on areas of a building which are out of reach.
  • step ladders and extension ladders is made for a wide range of tasks. With all work conducted up a ladder or on a platform, there is an inherent risk of injury from falling off the height access apparatus.
  • Base slip may occur where the person is located towards the top of the height access apparatus and the downward force of weight or movement causes the base to lose its grip on the floor or ground below;
  • Topside slide may occur when a lateral force is applied by the user as a result of the user stretching away from the ladder;
  • a height access apparatus which comprises:
  • first side rails or stiles which support a plurality of rungs, the rungs being
  • second side rails or stiles which support either, one or more brace, the one or more brace extending between the second side rails, or a plurality of rungs, the rungs being substantially equally spaced apart along the length of the side rails or stiles; a connector to which the first side rails or stiles and the second side rails or stiles are attached;
  • first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector.
  • the support structure is a ladder.
  • the connector is a top cap or top plate.
  • the coupling is positioned at least one fifth of the distance along the first and/or second rails or stiles from the connector. More preferably, the coupling is positioned substantially one half of the distance along the first and/or second rails or stiles from the connector.
  • the first section comprises a sleeve which accommodates an arm which is movable along at least part of the length of the sleeve to extend and retract the first section.
  • the arm is rotatably mounted in the sleeve.
  • the arm is fixedly connected to the extendible second section.
  • the sleeve is provided with a collar which is inserted into the side rail or stile of the height access apparatus.
  • the sleeve is rotatably mounted in the collar.
  • the first section is provided with a locking mechanism to prevent rotational and/or lateral movement of the sleeve and the arm.
  • the locking mechanism is a locking pin receivable by one or more hole in the sleeve and/or arm.
  • the locking mechanism is located on the collar.
  • the second section comprises a sleeve which accommodates a leg which is moveable along at least part of the length of the sleeve to extend and retract the second section.
  • the leg of the second section has a locking mechanism which fixes the length of the second section.
  • the locking mechanism is a compression fitting situated between the sleeve and the leg.
  • the first section is an extendable extendablemember connectable to a lateral member of the height access apparatus.
  • the second section is an extendable extendablemember.
  • the extendableextendable member has an adjustable sliding brake clamp.
  • the extendableextendable member has an adjustable sliding brake clamp with bolt and wing nut.
  • the extendable member is fixed in position by a JUBILEE CLIP??
  • the leg of the second section has a thread adapted to receive a locking nut, the position of which sets the length of the leg.
  • the leg has an interchangeable foot, which are shaped for different ground conditions.
  • the foot has a surface area at least twice that of the leg cross section, the foot being of particular use on soft ground.
  • the foot is T shaped to provide additional stability on hard ground.
  • substantially perpendicular means any and all angles around 90° which allow the support apparatus to function effectively.
  • the angle between the first section and the second section is 90° +/- 20°.
  • a pair of supports is connectable one on either side of a height access apparatus on both the first side rails or stiles and the second side rails or stiles.
  • first sections of said supports are mounted coaxially.
  • first sections of said supports are mounted axially offset.
  • the second section is connectable to a lateral member of a height access platform to allow easy storage of the support apparatus.
  • the second section of the support apparatus is parallel to the lateral member of the height support apparatus.
  • the second section of the support apparatus is curved.
  • the second section comprises at least two sleeves with corresponding legs, the sleeves being rotatably mounted at the connection with the arm at the first section, such that, in use, the legs may be positioned in front of and behind the height access apparatus.
  • the second section may further comprise a pressure sensor to warn the user of over-leaning and/or overloading.
  • the pressure sensor can be fitted at or near the end of the second section remote from the first section.
  • the height access apparatus is a step ladder.
  • the height access apparatus is an extension ladder.
  • the height access apparatus is a fixed ladder with a support as defined with respect to the first aspect of the invention.
  • the height access apparatus is an extension ladder.
  • the arm and leg of the support structure are connected together by a joint.
  • the joint has a sleeve which accepts the arm and a second sleeve which accepts the leg.
  • a support structure for use with a ladder or similarly functioning access platform comprising:
  • first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector.
  • the support structure is connected to a height access apparatus which comprises:
  • first side rails or stiles which support a plurality of rungs, the rungs being
  • second side rails or stiles which support either, one or more brace, the one or more brace extending between the second side rails, or a plurality of rungs, the rungs being substantially equally spaced apart along the length of the side rails or stiles; a connector to which the first side rails or stiles and the second side rails or stiles are attached.
  • the height access apparatus is a ladder.
  • the connector is a top cap or top plate.
  • the coupling is positioned at least one fifth of the distance along the first and/or second rails or stiles from the connector.
  • the coupling is positioned substantially one half of the distance along the first and/or second rails or stiles from the connector.
  • the first section comprises a sleeve which accommodates an arm which is movable along at least part of the length of the sleeve to extend and retract the first section.
  • the arm is rotatably mounted in the sleeve.
  • the arm is fixedly connected to the extendible second section.
  • the sleeve is provided with a collar which is inserted into the side rail or stile of the height access apparatus.
  • the sleeve is rotatably mounted in the collar.
  • the first section is provided with a locking mechanism to prevent rotational and/or lateral movement of the sleeve and the arm.
  • the locking mechanism is a locking pin receivable by one or more hole in the sleeve and/or arm.
  • the locking mechanism is located on the collar.
  • the second section comprises a sleeve which accommodates a leg which is moveable along at least part of the length of the sleeve to extend and retract the second section.
  • the leg of the second section has a locking mechanism which fixes the length of the second section.
  • the locking mechanism is a compression fitting situated between the sleeve and the leg.
  • the first section is an extendableextendablemember connectable to a lateral member of the height access apparatus.
  • the second section is an extendableextendable member.
  • the extendable member is fixed in position by a JUBILEE CLIP??
  • the leg of the second section has a thread adapted to receive a locking nut, the position of which sets the length of the leg.
  • the leg has an interchangeable foot, which are shaped for different ground conditions.
  • the foot has a surface area at least twice that of the leg cross section, the foot being of particular use on soft ground.
  • the foot is T shaped to provide additional stability on hard ground.
  • substantially perpendicular means any and all angles around 90° which allow the support apparatus to function effectively.
  • the angle between the first section and the second section is 90° +/- 20°.
  • a pair of supports is connectable one on either side of a height access apparatus on both the first side rails or stiles and the second side rails or stiles.
  • first sections of said supports are mounted coaxially.
  • the first sections of said supports are mounted axially offset.
  • the second section is connectable to a lateral member of a height access platform to allow easy storage of the support apparatus.
  • the second section of the support apparatus is parallel to the lateral member of the height support apparatus.
  • the second section of the support apparatus is curved.
  • the second section comprises at least two sleeves with corresponding legs, the sleeves being rotatably mounted at the connection with the arm at the first section, such that, in use, the legs may be positioned in front of and behind the height access apparatus.
  • the second section may further comprise a pressure sensor to warn the user of over-leaning and/or overloading.
  • the pressure sensor can be fitted at or near the end of the second section remote from the first section.
  • the height access apparatus is a step ladder.
  • the height access apparatus is an extension ladder.
  • the height access apparatus is a fixed ladder with a support as defined with respect to the first aspect of the invention.
  • the height access apparatus is an extension ladder.
  • the present invention provides a support for a height access apparatus which greatly improves the stability of the height access apparatus thereby greatly improving its safety. It also allows access through ceiling panels because the supports are not positioned at the connector/cap end of the apparatus.
  • Fig. 1 is a front view of an example of a ladder in accordance with the present invention showing front stabilizers in use;
  • Fig. 2 is a rear view of the example of figure 1 ;
  • Fig. 3 is a side view of an example of a ladder in accordance with the present invention having front and rear stabilizers in storage position;
  • Fig. 4 is an example of an extendableextendable arm attached to a leg sleeve with its threaded extendable leg in accordance with the present invention
  • Fig. 5 is an example of a extendable arm attached to a leg sleeve with its extendable leg in accordance with the present invention
  • Fig. 6 shows two types of extendable fittings
  • _ Fig. 7 Shows a sleeve for a extendable arm also a locking pin fitting for both.
  • Fig.8_ shows a telescope fitting
  • FIG 9- shows an adjustable sliding break clamp as shown in figure 8;
  • Figure 10 is a front view of another example of a ladder with stabilizers, in accordance with the present invention.
  • Figure 11 is a rear view of the example of figure 10;
  • Figure. 12 is a side view of an example of a ladder in accordance with the present invention having front and rear stabilizers in storage position;
  • Figure 13 is a front view of an attachable circular box for a extendable arm and leg sleeve and a side view of a extendable armattached to the box with a leg sleeve, extendable leg and leg clamp fitting;
  • Figure 14 shows an arm sleeve fitted through a front stile with a extendable arm and its locking pin
  • Figure 15 shows a side view of a leg sleeve with the leg clamp fitting and extendable leg
  • Figure 16 shows a side view and an elevated view of a leg clamp with its bolt and wing nut
  • Figure 17 shows a side view and an elevated view of several examples of interchangeable feet, which are shaped for different ground conditions and which are push fitted onto the stabilizer leg.
  • leg sleeve 6 6.
  • leg sleeve 23 female thread attachment on leg sleeve 23.
  • Figure 1 is a front view of a height access apparatus in accordance with the present invention, it shows the front stiles 13, ladder rungs 27, top cap 29.
  • the support structure 1 comprises a extendable arm 7 which is connected to stile 13 via an arm sleeve 9.
  • the leg has a leg sleeve 6 in which is located a extendable leg 5. The position of the leg as it is extendible longitudinally with respect to the stiles is controlled by the compression fitting 3. This mechanism is also shown in Figures 5 and 6.
  • FIG. 4 An alternative mechanism is shown in Figures 4 and 6.
  • a female thread attachment is provided by the leg 23 sleeve along with a female locking nut 25.
  • Figure 2 shows a set of second side rails or stiles 15 which have braces 31 extending between the stiles. It will be appreciated that whilst it is conventional to have a first side of a ladder with steps/rungs and a second side with one or more support braces, the second side could also have steps/rungs.
  • one of the braces 32 is configured to hold the extendable extension of the arm 7.
  • one of the steps/rungs is configured to hold the extendable extension of arm 7.
  • the support structure can be retracted to be flush with the stiles.
  • a clip 1 1 is provided to attach the legs 5 to the stiles.
  • Figure 3 shows an example of the present invention showing front stiles 13, rear stiles 15, the top cap 29, extendable arm 7, leg sleeve 6, extendable leg 5, compression fitting 3 and storage clip 11.
  • a cross brace 33 is also shown.
  • Figure 7 shows a sleeve for a extendable arm also a locking pin fitting for both.
  • Figure 8 shows a extendable fitting which comprises a sleeve 39, extendable leg 41 and an adjustable sliding brake clamp 35 which is shown in more detail in figure 9.
  • This clamp provides an alternative means for securing the leg in position.
  • Figures 10 to 17 show additional embodiments of the present invention in which the extendable arms 57 are of smaller diameter than shown in the embodiments of figures 1 to 7.
  • the stabilizers comprise extendable arms 57 and legs 53 which extend outwards from a ladder on the front and rear stiles 63, 65.
  • the arms are stored in the space between the stiles 63, 65 and the legs are attached to the side of the stiles 63, 65 by means of a clip 61 , when not in use.
  • each leg is independently adjustable and can therefore, provide stability and support for the ladder when areas of ground around the ladder are uneven or inclined
  • figure 1 1 arm storage is provided in two separate sleeves which are fixed in positioned between the stiles.
  • figure 12 shows a storage foot 79 which is fitted to the bottom of the leg.
  • the storage foot may be swapped for any of feet 81 , 83 or 85, depending upon the ground conditions.
  • the large diameter foot 83 is preferable for soft ground because it spreads the weight of the ladder over a larger area and reduces the risk that the feet will sink into the ground.
  • the T-shaped foot is generally preferred where greater stability. This and other feet may be pivotably attached to the leg and may be locked in position.
  • Figure 13 shows the circular box joint 75 which joins together the arm 57 and leg sleeve 55.
  • the embodiment of figure 1 shows a solid continuous arm which has a right-angle bend, which acts as a leg sleeve in its vertical section. Using the joint 75 allows the arms and legs to be manufactured separately. This feature is also shown in figures 10 and 11.
  • Figure 14 shows an extendable arm 57 in a sleeve 59.
  • the arm is secured in an extended position using a pin 67 which fits through holes in the arm 57 and sleeve 59.
  • the leg is shown in the leg sleeve 55 and is held in position using the leg clamp as shown in figure 13 with collar 87
  • the ladder may be a conventional step ladder which has front stiles 13 with steps 27 extending between the front stiles 13, rear stiles 15 with braces 31 extending between the rear stiles 15.
  • the support structure 1 is provided on both the front and rear stiles. It is shown in its extended position in figures 1 and 2 connected to the front and rear stiles respectively. The position of the support structure 1 around half way up the stiles and the additional number of stiles provide improved stability.
  • the lower part of the extendable leg 6 is removed from the clip 1 1 and the leg 6 is moved laterally outwards from the stile 13 and is extended an appropriate distance from the stile 13. The maximum distance is determined by the length of the arm 7 which is stored and extended from a hollow rung 32.
  • the ground engaging end of the leg 6 is securely positioned on the ground and the length of the leg adjusted and fixed in position using the compression fitting as shown in figure 5 or the threaded locking nut shown in figure 4. Once all four legs and arms have been extended to a preferred position and secured in position on the ground, the ladder is ready for use.
  • the support structure is preferably located near the mid-point between the top and bottom of the ladder and greatly improves the stability of the ladder in use.
  • the legs are independently adjustable which makes the ladder suitable for use on uneven ground.
  • the support structure comprises extendable arms and legs which are extendible laterally and longitudinally from both stiles of the front and rear pairs of stiles.
  • this provides added stability. It also allows the user to use the support at one side of the ladder and not at both should they so choose. This may be required where one side of the ladder is against a wall or other obstruction, but the support on the other side may be used to give additional stability.
  • the support structure is connected to the height access apparatus at a position remote from its top. The advantage being that the top of the ladder has not been widened.
  • connecting the support structure to the ladder at a position further down the side of the ladder provides support and ensures that the top of the ladder is no wider than necessary, thereby allowing the top to fit into smaller areas such as roof spaces or up into spaces behind ceiling panels.
  • the support structure may be located at or near the centre of mass of the ladder to further improve the stability of the ladder when the supports are used.
  • the extendable arm and leg of the support structure are connected together by a joint that has a sleeve which accepts the arm and a second sleeve which accepts the leg.
  • the arm sleeve and the leg sleeve are perpendicular to one another.
  • the sleeves may provide a tight fit around the respective arm and leg or may provide a looser fit, in which case a tighter, such as a jubilee clip or other appropriate fastener may be used to secure the leg or arm in position.
  • the leg is provided with interchangeable feet which the user may select depending upon ground conditions.
  • large feet may be selected which spread the weight of the ladder across a greater area of the ground to prevent or lessen sinking of the ladder into the ground.
  • an elongated or T shaped foot may be preferred to provide additional stability.
  • the surface has less friction, narrower feet, that dig into the surface may be preferred.

Abstract

A support structure for use with a ladder or similarly functioning access platform. The support structure has an extendible first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector. The support structure is preferably located near the mid-point between the top and bottom of the ladder and greatly improves the stability of the ladder in use.

Description

Improved Step Ladder and Support Structure
Introduction
The present invention relates to a support structure which facilitates an improvement in safety for those using height access apparatus. It also relates to improved height access apparatus.
Background
There are many types of height access or working apparatus for example step ladders, extension ladders, podium steps, access towers, scaffolds, trestles and step up platforms. This type of apparatus is used by tradesmen such as electricians, plumbers, painter and joiners when working on areas of a building which are out of reach. In addition, much domestic use of step ladders and extension ladders is made for a wide range of tasks. With all work conducted up a ladder or on a platform, there is an inherent risk of injury from falling off the height access apparatus.
In many cases, accidents occur because the weight of the user or movement of the user causes a force and resultant destabilising movement in the height access apparatus. Four types of destabilising movement commonly occur:
1 . Base slip may occur where the person is located towards the top of the height access apparatus and the downward force of weight or movement causes the base to lose its grip on the floor or ground below;
2. Loss of top contact may occur when movement on the height access
apparatus causes it to flex. It can also occur where the user exerts a force on the ladder away from a supporting wall;
3. Topside slide may occur when a lateral force is applied by the user as a result of the user stretching away from the ladder; and
4. Flip may occur when weight or movement of the ladder causes it to flip over. Some height apparatus need to have external stabilizers which are separate items of apparatus which are connectable to the height access apparatus. This makes it bulky and cumbersome for storage and transportation.
International Patent application PCT/GB2012/000497 describes a support for a ladder which provides a pair of laterally extending supports which are attached to a step ladder at or near its top apex.
Summary of the Invention
In accordance with a first aspect of the invention, there is provided a height access apparatus which comprises:
first side rails or stiles which support a plurality of rungs, the rungs being
substantially equally spaced apart along the length of the side rails or stiles;
second side rails or stiles which support either, one or more brace, the one or more brace extending between the second side rails, or a plurality of rungs, the rungs being substantially equally spaced apart along the length of the side rails or stiles; a connector to which the first side rails or stiles and the second side rails or stiles are attached;
a support structure attached to the first side rails or stiles and/or the second side rails or stiles, the support structure comprising:
an extendible first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector.
Preferably, the support structure is a ladder.
Preferably, the connector is a top cap or top plate.
Preferably, the coupling is positioned at least one fifth of the distance along the first and/or second rails or stiles from the connector. More preferably, the coupling is positioned substantially one half of the distance along the first and/or second rails or stiles from the connector.
Preferably, the first section comprises a sleeve which accommodates an arm which is movable along at least part of the length of the sleeve to extend and retract the first section.
Preferably, the arm is rotatably mounted in the sleeve.
Preferably, the arm is fixedly connected to the extendible second section.
Preferably, the sleeve is provided with a collar which is inserted into the side rail or stile of the height access apparatus.
Optionally, the sleeve is rotatably mounted in the collar.
Optionally, the first section is provided with a locking mechanism to prevent rotational and/or lateral movement of the sleeve and the arm.
Optionally, the locking mechanism is a locking pin receivable by one or more hole in the sleeve and/or arm.
Optionally, the locking mechanism is located on the collar.
Preferably, the second section comprises a sleeve which accommodates a leg which is moveable along at least part of the length of the sleeve to extend and retract the second section.
Preferably, the leg of the second section has a locking mechanism which fixes the length of the second section.
Preferably the locking mechanism is a compression fitting situated between the sleeve and the leg. Alternatively, the first section is an extendable extendablemember connectable to a lateral member of the height access apparatus.
Alternatively, the second section is an extendable extendablemember.
Optionally the extendableextendable member has an adjustable sliding brake clamp.
Optionally the extendableextendable member has an adjustable sliding brake clamp with bolt and wing nut.
Preferably, the extendable member is fixed in position by a JUBILEE CLIP??
Preferably, the leg of the second section has a thread adapted to receive a locking nut, the position of which sets the length of the leg.
Preferably, the leg has an interchangeable foot, which are shaped for different ground conditions.
Optionally, the foot has a surface area at least twice that of the leg cross section, the foot being of particular use on soft ground.
Optionally, the foot is T shaped to provide additional stability on hard ground.
The term substantially perpendicular means any and all angles around 90° which allow the support apparatus to function effectively.
Preferably, the angle between the first section and the second section is 90° +/- 20°.
Preferably, a pair of supports is connectable one on either side of a height access apparatus on both the first side rails or stiles and the second side rails or stiles.
Optionally the first sections of said supports are mounted coaxially. Optionally the first sections of said supports are mounted axially offset.
Preferably, the second section is connectable to a lateral member of a height access platform to allow easy storage of the support apparatus.
Preferably, the second section of the support apparatus is parallel to the lateral member of the height support apparatus.
Optionally, the second section of the support apparatus is curved.
Alternatively, the second section comprises at least two sleeves with corresponding legs, the sleeves being rotatably mounted at the connection with the arm at the first section, such that, in use, the legs may be positioned in front of and behind the height access apparatus.
Preferably, the second section may further comprise a pressure sensor to warn the user of over-leaning and/or overloading.
Preferably, the pressure sensor can be fitted at or near the end of the second section remote from the first section.
Preferably, the height access apparatus is a step ladder.
Optionally, the height access apparatus is an extension ladder.
Optionally, the height access apparatus is a fixed ladder with a support as defined with respect to the first aspect of the invention.
Optionally, the height access apparatus is an extension ladder.
Preferably, the arm and leg of the support structure are connected together by a joint. Preferably, the joint has a sleeve which accepts the arm and a second sleeve which accepts the leg.
In accordance with a second aspect of the invention there is provided a support structure for use with a ladder or similarly functioning access platform, the support structure comprising:
an extendible first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector.
Preferably, the support structure is connected to a height access apparatus which comprises:
first side rails or stiles which support a plurality of rungs, the rungs being
substantially equally spaced apart along the length of the side rails or stiles;
second side rails or stiles which support either, one or more brace, the one or more brace extending between the second side rails, or a plurality of rungs, the rungs being substantially equally spaced apart along the length of the side rails or stiles; a connector to which the first side rails or stiles and the second side rails or stiles are attached.
Preferably, the height access apparatus is a ladder.
Preferably, the connector is a top cap or top plate.
Preferably, the coupling is positioned at least one fifth of the distance along the first and/or second rails or stiles from the connector.
More preferably, the coupling is positioned substantially one half of the distance along the first and/or second rails or stiles from the connector. Preferably, the first section comprises a sleeve which accommodates an arm which is movable along at least part of the length of the sleeve to extend and retract the first section.
Preferably, the arm is rotatably mounted in the sleeve.
Preferably, the arm is fixedly connected to the extendible second section.
Preferably, the sleeve is provided with a collar which is inserted into the side rail or stile of the height access apparatus.
Optionally, the sleeve is rotatably mounted in the collar.
Optionally, the first section is provided with a locking mechanism to prevent rotational and/or lateral movement of the sleeve and the arm.
Optionally, the locking mechanism is a locking pin receivable by one or more hole in the sleeve and/or arm.
Optionally, the locking mechanism is located on the collar.
Preferably, the second section comprises a sleeve which accommodates a leg which is moveable along at least part of the length of the sleeve to extend and retract the second section.
Preferably, the leg of the second section has a locking mechanism which fixes the length of the second section.
Preferably the locking mechanism is a compression fitting situated between the sleeve and the leg.
Alternatively, the first section is an extendableextendablemember connectable to a lateral member of the height access apparatus. Alternatively, the second section is an extendableextendable member.
Preferably, the extendable member is fixed in position by a JUBILEE CLIP??
Preferably, the leg of the second section has a thread adapted to receive a locking nut, the position of which sets the length of the leg.
Preferably, the leg has an interchangeable foot, which are shaped for different ground conditions.
Optionally, the foot has a surface area at least twice that of the leg cross section, the foot being of particular use on soft ground.
Optionally, the foot is T shaped to provide additional stability on hard ground.
The term substantially perpendicular means any and all angles around 90° which allow the support apparatus to function effectively.
Preferably, the angle between the first section and the second section is 90° +/- 20°.
Preferably, a pair of supports is connectable one on either side of a height access apparatus on both the first side rails or stiles and the second side rails or stiles.
Optionally the first sections of said supports are mounted coaxially.
Optionally the first sections of said supports are mounted axially offset.
Preferably, the second section is connectable to a lateral member of a height access platform to allow easy storage of the support apparatus.
Preferably, the second section of the support apparatus is parallel to the lateral member of the height support apparatus. Optionally, the second section of the support apparatus is curved.
Alternatively, the second section comprises at least two sleeves with corresponding legs, the sleeves being rotatably mounted at the connection with the arm at the first section, such that, in use, the legs may be positioned in front of and behind the height access apparatus.
Preferably, the second section may further comprise a pressure sensor to warn the user of over-leaning and/or overloading.
Preferably, the pressure sensor can be fitted at or near the end of the second section remote from the first section.
Preferably, the height access apparatus is a step ladder.
Optionally, the height access apparatus is an extension ladder.
Optionally, the height access apparatus is a fixed ladder with a support as defined with respect to the first aspect of the invention.
Optionally, the height access apparatus is an extension ladder.
The present invention provides a support for a height access apparatus which greatly improves the stability of the height access apparatus thereby greatly improving its safety. It also allows access through ceiling panels because the supports are not positioned at the connector/cap end of the apparatus.
It can be made from any cross sectional shape that suits extendableextension. In this instance they will be described by a tubular shape which enables the legs when the arms are retracted to be swivelled to a storage position and held snugly against the stiles of step ladders and extension ladders or the frames of any other height apparatus making storage and transportation easy. Brief Description of the Drawings
The invention will now be described by way of example only with reference to the accompanying drawings in which:
Fig. 1 is a front view of an example of a ladder in accordance with the present invention showing front stabilizers in use;
Fig. 2 is a rear view of the example of figure 1 ;
Fig. 3 is a side view of an example of a ladder in accordance with the present invention having front and rear stabilizers in storage position;
Fig. 4 is an example of an extendableextendable arm attached to a leg sleeve with its threaded extendable leg in accordance with the present invention;
Fig. 5 is an example of a extendable arm attached to a leg sleeve with its extendable leg in accordance with the present invention; Fig. 6 shows two types of extendable fittings;
_ Fig. 7 Shows a sleeve for a extendable arm also a locking pin fitting for both.
Fig.8_shows a telescope fitting;
FIG 9- shows an adjustable sliding break clamp as shown in figure 8;;
Figure 10 is a front view of another example of a ladder with stabilizers, in accordance with the present invention;
Figure 11 is a rear view of the example of figure 10;
Figure. 12 is a side view of an example of a ladder in accordance with the present invention having front and rear stabilizers in storage position; Figure 13 is a front view of an attachable circular box for a extendable arm and leg sleeve and a side view of a extendable armattached to the box with a leg sleeve, extendable leg and leg clamp fitting;
Figure 14 shows an arm sleeve fitted through a front stile with a extendable arm and its locking pin;
Figure 15 shows a side view of a leg sleeve with the leg clamp fitting and extendable leg;
Figure 16 shows a side view and an elevated view of a leg clamp with its bolt and wing nut; and
Figure 17 shows a side view and an elevated view of several examples of interchangeable feet, which are shaped for different ground conditions and which are push fitted onto the stabilizer leg.
Detailed Description of the Drawings
The present invention is described with reference to several embodiments which are shown in figures 1 to 17. The features of figures 1 to 17 are listed below for ease of reference.
Support structure 1
compression fitting 3
extendable leg 5.
leg sleeve 6.
extendable arm 7.
arm sleeve 9.
storage clip for extendable leg 11.
front stiles for steps 13.
rear stiles for steps 15.
rubber ring for compression fitting 17.
compression ring for fitting 19 locking pin fitting for extendable arm and sleeve 21.
female thread attachment on leg sleeve 23.
female threaded locking nut 25
Ladder Rungs 27
Top Cap 29
Brace 31
Cross brace 33adjustable sliding brake clamp 35
Clamp bolt, with wing nut 37
Telescope leg sleeve 39
Telescope leg 41
Adjustable sliding brake clamp with bolt and wing nut 43
Stabilizer 51
Extendable leg 53
Leg sleeve 55
Extendable arm 57
Arm sleeve 59
Storage clip for extendable leg 61
Front stiles for steps 63
Rear stiles for steps 65
Locking pin for extendable arm and sleeve 67
Treads for steps 69
Leg clamp 71
Nut and bolt for leg clamp 73
Attachable circular box/joint 75
Storage foot 79
T-shaped foot 81
Large diameter disc pad foot 83
Small diameter disc pad foot 85
Top cap 87
Figure 1 is a front view of a height access apparatus in accordance with the present invention, it shows the front stiles 13, ladder rungs 27, top cap 29.. The support structure 1 comprises a extendable arm 7 which is connected to stile 13 via an arm sleeve 9. The leg has a leg sleeve 6 in which is located a extendable leg 5. The position of the leg as it is extendible longitudinally with respect to the stiles is controlled by the compression fitting 3. This mechanism is also shown in Figures 5 and 6.
An alternative mechanism is shown in Figures 4 and 6. In that example, a female thread attachment is provided by the leg 23 sleeve along with a female locking nut 25.
Figure 2 shows a set of second side rails or stiles 15 which have braces 31 extending between the stiles. It will be appreciated that whilst it is conventional to have a first side of a ladder with steps/rungs and a second side with one or more support braces, the second side could also have steps/rungs.
In this example one of the braces 32 is configured to hold the extendable extension of the arm 7.
In the front stiles, one of the steps/rungs is configured to hold the extendable extension of arm 7.
In both cases, the support structure can be retracted to be flush with the stiles. A clip 1 1 is provided to attach the legs 5 to the stiles.
Figure 3 shows an example of the present invention showing front stiles 13, rear stiles 15, the top cap 29, extendable arm 7, leg sleeve 6, extendable leg 5, compression fitting 3 and storage clip 11. A cross brace 33 is also shown.
Figure 7 shows a sleeve for a extendable arm also a locking pin fitting for both.
Figure 8 shows a extendable fitting which comprises a sleeve 39, extendable leg 41 and an adjustable sliding brake clamp 35 which is shown in more detail in figure 9. This clamp provides an alternative means for securing the leg in position.
Figures 10 to 17 show additional embodiments of the present invention in which the extendable arms 57 are of smaller diameter than shown in the embodiments of figures 1 to 7. As with previous embodiments, the stabilizers comprise extendable arms 57 and legs 53 which extend outwards from a ladder on the front and rear stiles 63, 65. The arms are stored in the space between the stiles 63, 65 and the legs are attached to the side of the stiles 63, 65 by means of a clip 61 , when not in use.
The position of each leg is independently adjustable and can therefore, provide stability and support for the ladder when areas of ground around the ladder are uneven or inclined Once the position of each leg has been laterally and vertically extended to a suitable position, Each leg is held in place using a clamp 71.
It will be noted in figure 1 1 that arm storage is provided in two separate sleeves which are fixed in positioned between the stiles. In addition, figure 12 shows a storage foot 79 which is fitted to the bottom of the leg. The storage foot may be swapped for any of feet 81 , 83 or 85, depending upon the ground conditions. The large diameter foot 83 is preferable for soft ground because it spreads the weight of the ladder over a larger area and reduces the risk that the feet will sink into the ground. The T-shaped foot is generally preferred where greater stability. This and other feet may be pivotably attached to the leg and may be locked in position.
Figure 13 shows the circular box joint 75 which joins together the arm 57 and leg sleeve 55. The embodiment of figure 1 shows a solid continuous arm which has a right-angle bend, which acts as a leg sleeve in its vertical section. Using the joint 75 allows the arms and legs to be manufactured separately. This feature is also shown in figures 10 and 11.
Figure 14 shows an extendable arm 57 in a sleeve 59. In this example, the arm is secured in an extended position using a pin 67 which fits through holes in the arm 57 and sleeve 59. In figure 15, the leg is shown in the leg sleeve 55 and is held in position using the leg clamp as shown in figure 13 with collar 87
In use, the ladder may be a conventional step ladder which has front stiles 13 with steps 27 extending between the front stiles 13, rear stiles 15 with braces 31 extending between the rear stiles 15. The support structure 1 is provided on both the front and rear stiles. It is shown in its extended position in figures 1 and 2 connected to the front and rear stiles respectively. The position of the support structure 1 around half way up the stiles and the additional number of stiles provide improved stability. In order to extend the support structure, the lower part of the extendable leg 6 is removed from the clip 1 1 and the leg 6 is moved laterally outwards from the stile 13 and is extended an appropriate distance from the stile 13. The maximum distance is determined by the length of the arm 7 which is stored and extended from a hollow rung 32. Once it has been extended the ground engaging end of the leg 6 is securely positioned on the ground and the length of the leg adjusted and fixed in position using the compression fitting as shown in figure 5 or the threaded locking nut shown in figure 4. Once all four legs and arms have been extended to a preferred position and secured in position on the ground, the ladder is ready for use.
The support structure is preferably located near the mid-point between the top and bottom of the ladder and greatly improves the stability of the ladder in use.
Advantageously, the legs are independently adjustable which makes the ladder suitable for use on uneven ground. It will be noted that the support structure comprises extendable arms and legs which are extendible laterally and longitudinally from both stiles of the front and rear pairs of stiles. Advantageously, this provides added stability. It also allows the user to use the support at one side of the ladder and not at both should they so choose. This may be required where one side of the ladder is against a wall or other obstruction, but the support on the other side may be used to give additional stability. In addition, the support structure is connected to the height access apparatus at a position remote from its top. The advantage being that the top of the ladder has not been widened.
Widening the top of the ladder can cause access problems when the ladder is being used to reach services concealed behind ceiling panels, for example.
Advantageously, connecting the support structure to the ladder at a position further down the side of the ladder, provides support and ensures that the top of the ladder is no wider than necessary, thereby allowing the top to fit into smaller areas such as roof spaces or up into spaces behind ceiling panels. In addition, the support structure may be located at or near the centre of mass of the ladder to further improve the stability of the ladder when the supports are used.
In another embodiment of the present invention, the extendable arm and leg of the support structure are connected together by a joint that has a sleeve which accepts the arm and a second sleeve which accepts the leg. The arm sleeve and the leg sleeve are perpendicular to one another. The sleeves may provide a tight fit around the respective arm and leg or may provide a looser fit, in which case a tighter, such as a jubilee clip or other appropriate fastener may be used to secure the leg or arm in position.
In at least one embodiment of the present invention, the leg is provided with interchangeable feet which the user may select depending upon ground conditions.
If the ladder is being used outdoors on soft ground, large feet may be selected which spread the weight of the ladder across a greater area of the ground to prevent or lessen sinking of the ladder into the ground.
If the ladder is to be used on a hard surface an elongated or T shaped foot may be preferred to provide additional stability. In another instance, if the surface has less friction, narrower feet, that dig into the surface may be preferred.
The above embodiment relates to a step ladder, the invention may be used with other platform types. Improvements and modifications may be incorporated herein without deviating from the scope of the invention.

Claims

Claims
1. A height access apparatus which comprises:
first side rails or stiles which support a plurality of rungs, the rungs being
substantially equally spaced apart along the length of the side rails or stiles;
second side rails or stiles which support either, one or more brace, the one or more brace extending between the second side rails, or a plurality of rungs, the rungs being substantially equally spaced apart along the length of the side rails or stiles; a connector to which the first side rails or stiles and the second side rails or stiles are attached;
a support structure attached to the first side rails or stiles and/or the second side rails or stiles, the support structure comprising:
an extendible first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector.
2. The support structure as claimed in claim 1 wherein, the connector is a top cap or top plate.
3. The support structure as claimed in claim 1 or claim 2 wherein, the coupling is positioned at least one fifth of the distance along the first and/or second rails or stiles from the connector.
4. The support structure as claimed in any preceding claim wherein, the coupling is positioned substantially one half of the distance along the first and/or second rails or stiles from the connector.
5. The support structure as claimed in any preceding claim wherein, the first section comprises a sleeve which accommodates an arm which is movable along at least part of the length of the sleeve to extend and retract the first section.
6. The support structure as claimed in any preceding claim wherein, the arm is rotatably mounted in the sleeve.
7. The support structure as claimed in any preceding claim wherein, the arm is fixedly connected to the extendible second section.
8. The support structure as claimed in any preceding claim wherein, the sleeve is provided with a collar which is inserted into the side rail or stile of the height access apparatus.
9. The support structure as claimed in any preceding claim wherein, the sleeve is rotatably mounted in the collar.
10. The support structure as claimed in any preceding claim wherein, the support structure as claimed in any preceding claim wherein, the first section is provided with a locking mechanism to prevent rotational and/or lateral movement of the sleeve and the arm.
1 1. The support structure as claimed in any preceding claim wherein, the locking mechanism is a locking pin receivable by one or more hole in the sleeve and/or arm.
12. The support structure as claimed in any of claims 1 to 10 wherein, the locking mechanism is located on the collar.
13. The support structure as claimed in any preceding claim wherein, the second section comprises a sleeve which accommodates a leg which is moveable along at least part of the length of the sleeve to extend and retract the second section.
14. The support structure as claimed in any preceding claim wherein, the leg of the second section has a locking mechanism which fixes the length of the second section.
15. The support structure as claimed in any preceding claim wherein, the locking mechanism is a compression fitting situated between the sleeve and the leg.
16. The support structure as claimed in any of claims 1 to 14 wherein, the first section is a extendable member connectable to a lateral member of the height access apparatus.
17. The support structure as claimed in any of claims 1 to 14 wherein, the second section is a extendable member.
18. The support structure as claimed in claim 17 wherein the extendable member has an adjustable sliding brake clamp.
19. The support structure as claimed in claim 17 or 18 wherein, the extendable member has an adjustable sliding brake clamp with bolt and wing nut.
20. The support structure as claimed in any preceding claim wherein, the leg of the second section has a thread adapted to receive a locking nut, the position of which sets the length of the leg.
21. The support structure as claimed in any preceding claim wherein, the leg has an interchangeable foot, which are shaped for different ground conditions.
22. The support structure as claimed in claim 21 wherein, the foot has a surface area at least twice that of the leg cross section, the foot being of particular use on soft ground.
23. The support structure as claimed in claim 21 wherein, the foot is T shaped to provide additional stability on hard ground.
24. The support structure as claimed in any preceding claim wherein, the angle between the first section and the second section is 90° +/- 20°.
25. The support structure as claimed in any preceding claim wherein, a pair of supports is connectable one on either side of a height access apparatus on both the first side rails or stiles and the second side rails or stiles.
26. The support structure as claimed in claim 25 wherein, the first sections of said supports are mounted coaxially.
27. The support structure as claimed in claim 25 wherein, the first sections of said supports are mounted axially offset.
28. The support structure as claimed in claim 25 wherein, the second section is connectable to a lateral member of a height access platform to allow easy storage of the support apparatus.
29. The support structure as claimed in any preceding claim wherein, the second section of the support apparatus is parallel to the lateral member of the height support apparatus.
30. The support structure as claimed in any preceding claim wherein, the second section of the support apparatus is curved.
31. The support structure as claimed in claim 1 to 29 wherein, the second section comprises at least two sleeves with corresponding legs, the sleeves being rotatably mounted at the connection with the arm at the first section, such that, in use, the legs may be positioned in front of and behind the height access apparatus.
32. The support structure as claimed in claim 31 wherein, the second section may further comprise a pressure sensor to warn the user of over-leaning and/or overloading.
33. The support structure as claimed in claim 31 wherein, the pressure sensor can be fitted at or near the end of the second section remote from the first section.
34. The support structure as claimed in any preceding claim wherein the first section and second section of the support structure are connected together by a joint.
35. The support structure as claimed in claim 34 wherein, the joint has a sleeve which receives the first section and a second sleeve which receives the second section.
36. A support structure for use with a ladder or similarly functioning access platform, the support structure comprising:
an extendible first section attached to an extendible second section, the first section being substantially perpendicular to the second section, wherein the first section is adapted to be laterally extendible from the side rails or stiles and the second section is extendible to allow ground engaging means located remote from the first section to contact the ground, in use, and a coupling for connecting the support structure to the stiles, the coupling being positioned remote from the connector.
37. A support structure with features as claimed in any of claims 2 to 35.
PCT/GB2020/000017 2019-02-18 2020-02-17 Improved step ladder and support structure WO2020169942A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2112043.1A GB2595396B (en) 2019-02-18 2020-02-17 Improved step ladder and support structure

Applications Claiming Priority (4)

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GBGB1902205.2A GB201902205D0 (en) 2019-02-18 2019-02-18 Improved step ladder
GBGB1902205.2 2019-02-18
GBGB1908710.5 2019-06-18
GBGB1908710.5A GB201908710D0 (en) 2019-06-18 2019-06-18 Improved step ladder

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP7083749B2 (en) 2016-03-30 2022-06-13 株式会社ニコン Image sensor

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US4949809A (en) * 1989-12-07 1990-08-21 A. C. Innovations, Inc. Extendable pole locking mechanism for ladder stabilizer
CA2281309A1 (en) * 1998-08-31 2000-02-29 Norman James Mcferran Ladder stabilizer
CA2543948A1 (en) * 2006-04-24 2007-10-24 Ladder Stabilizerz Inc. Ladder stabilizer
CA2611716A1 (en) * 2007-12-10 2009-06-10 Gary J. Robichaud Ladder safety bracket and legs, with optional work platform
SE0900540A1 (en) * 2009-04-23 2010-10-24 Goeran Svensson Ergonomic and safety systems for ladder
WO2012168684A1 (en) * 2011-06-10 2012-12-13 Garry Mcdonald Support apparatus and improved height access apparatus

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Publication number Priority date Publication date Assignee Title
US4949809A (en) * 1989-12-07 1990-08-21 A. C. Innovations, Inc. Extendable pole locking mechanism for ladder stabilizer
CA2281309A1 (en) * 1998-08-31 2000-02-29 Norman James Mcferran Ladder stabilizer
CA2543948A1 (en) * 2006-04-24 2007-10-24 Ladder Stabilizerz Inc. Ladder stabilizer
CA2611716A1 (en) * 2007-12-10 2009-06-10 Gary J. Robichaud Ladder safety bracket and legs, with optional work platform
SE0900540A1 (en) * 2009-04-23 2010-10-24 Goeran Svensson Ergonomic and safety systems for ladder
WO2012168684A1 (en) * 2011-06-10 2012-12-13 Garry Mcdonald Support apparatus and improved height access apparatus

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Publication number Priority date Publication date Assignee Title
JP7083749B2 (en) 2016-03-30 2022-06-13 株式会社ニコン Image sensor

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GB2595396B (en) 2023-07-19
GB2595396A (en) 2021-11-24
GB202112043D0 (en) 2021-10-06

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