GB2285235A - Attaching a rung of a ladder to the ladder stile - Google Patents

Attaching a rung of a ladder to the ladder stile Download PDF

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Publication number
GB2285235A
GB2285235A GB9424663A GB9424663A GB2285235A GB 2285235 A GB2285235 A GB 2285235A GB 9424663 A GB9424663 A GB 9424663A GB 9424663 A GB9424663 A GB 9424663A GB 2285235 A GB2285235 A GB 2285235A
Authority
GB
United Kingdom
Prior art keywords
rung
stile
ladder
corrugations
tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9424663A
Other versions
GB9424663D0 (en
Inventor
James Brian Clarke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of GB9424663D0 publication Critical patent/GB9424663D0/en
Publication of GB2285235A publication Critical patent/GB2285235A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C7/00Component parts, supporting parts, or accessories
    • E06C7/08Special construction of longitudinal members, or rungs or other treads
    • E06C7/082Connections between rungs or treads and longitudinal members
    • E06C7/083Bracket type connection

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

A method of attaching a hollow rung 1 of a ladder to a stile 4 of the ladder. The rung 1 is inserted through a hole 3 in the stile and is then expanded on both sides of the stile 4 forming a bulge 11 on each side of the stile thereby securing the rung 1 in place. Corrugations 2 on the rung 1 allow the bulges to be formed without significantly stretching the rung fabric. <IMAGE>

Description

METHOD OF ATTACHING A HOLLOW RUNG OF A LADDER TO A STILE OF THE LADDER The present invention relates to a method of attaching a hollow rung of a ladder to a stile of a ladder.
To attach a hollow rung to a stile of a ladder requires two stages of manipulation of the rung material.
Firstly, a shoulder is formed near each end of the rung by either locally expanding or reducing the rung section. The rung is then inserted into a hole in the stile with the shoulder acting as a stop. Secondly, the projecting free end of the rung is swaged to form a lip to retain the rung in place. Swaging entails considerable stretching of the fabric of the rung, which, to avoid splitting, imposes limitations on the shape and the hardness of the rung.
According to a first aspect of the present invention, a method of attaching a hollow rung of a ladder to a stile of the ladder comprises inserting the rung through a hole in the stile, and subsequently expanding the rung on both side of the stile to form a bulge on each side of the stile to secure the rung to the stile.
This method can be done as a one stage process thereby speeding up manufacture. As no swaging is involved, the limitations on the shape and hardness of the rung are lessened.
The rung is preferably expanded using a tool having a circumferentially extending groove which is aligned with the wall of the stile, and the tool is subsequently forced against the inside wall of the rung.
The tool could be vibrated to expand the rung, or, if the rung was substantially circular with a cog shaped inner profile, and the head was of similar, but slightly mismatched shape, the tool could be rotated to throw the wall of the rung outwardly. However, the simplest way of expanding the rung is to use a tool formed of a plurality of segments which are forced apart by a wedge shape member to expand the rung.
In order to reduce the stresses on the rung material when it is expanded, the rung can be provided with corrugations which extend in the longitudinal direction of the rung at the region of the rung which is expanded. The corrugations are preferably intermittently disposed and around the rung.
This feature forms a second aspect of the present invention defined in its broadest terms as a hollow rung for a ladder, the rung being provided adjacent to an end, at a portion which is to be expanded during assembly with a stile, with corrugations which extend in the longitudinal direction of the rung.
The rung can be used with the method according to the first aspect of the present invention, or in a conventional method of assembling a ladder, in which case the corrugations would be provided on the part to be swaged.
The corrugations provide a surplus of material which allows the rungs to be deformed without significantly stretching the fabric of the rung. The corrugations are preferably intermittently disposed around the rung.
An example of a rung and stile constructed using the method of the present invention and incorporating the rung of the present invention will now be described with reference to the accompanying drawings, in which: Fig. 1 is a diagrammatic front view in partial section showing part of a rung and a stile with a tool inserted; and Fig. 2 is a side view corresponding to Fig. 1.
The rung 1 shown in Figs. 1 and 2 is hollow and has a substantially trapezoidal transverse profile which is initially constant along its length. Longitudinally extending corrugations 2 are formed intermittently around the rung 1. The rung 1 is shown with its end inserted into a hole 3 in a stile 4, the hole being shaped to match the substantially trapezoidal shape of the outer surface of the rung 1.
A tool 5 is shown inserted into the end of the hollow rung 1. The tool 5 comprises a head 6 which has a profile to match the substantially trapezoidal shape of the inner surface of the rung. The head 6 has a peripheral groove 7 and consists of four longitudinally extending segments 8 which are mutually separable in a transverse plane. Each of the segments 8 is provided with an inwardly facing wedge shape surface 9. Between these wedge shape surfaces 9 a wedge 10 is inserted.
In order to secure the rung 1 to the stile 4, the rung is first inserted into the hole 3 in the stile to the desired extent. The tool 5 is then introduced into the interior of the rung 1 so that the groove 7 is aligned with the stile 4. The wedge 10 is then pulled or pushed into the head 6 so that the four segments 8 of the head are transversely separated. This causes bulges 11 to be formed in the rung 1 on either side of the stile corresponding to the positions on either side of the groove 7.

Claims (9)

1. A method of attaching a hollow rung of a ladder to a stile of the ladder, the method comprising inserting the rung through a hole in the stile, and subsequently expanding the rung on both sides of the stile to form a bulge on each side of the stile to secure the rung to the stile.
2. A method according to claim 1, wherein the rung is expanded using a tool having a circumferentially extending groove which is aligned with the wall of the stile, and the tool is subsequently forced against the inside wall of the rung.
3. A method according to claim 2, wherein the tool is formed of a plurality of segments which are forced apart by a wedge shape member to expand the rung.
4. A method according to any one of the preceding claims, wherein the rung is provided with corrugations which extend in the longitudinal direction of the rung at the region of the rung which is expanded.
5. A method according to claim 4, wherein the corrugations are intermittently disposed around the rung.
6. A method substantially as described with reference to the accompanying drawings.
7. A hollow rung for a ladder, the rung being provided adjacent to an end, at a portion which is to be expanded during assembly with a stile, with corrugations which extend in the longitudinal direction of the rung.
8. A rung according to claim 7, wherein the corrugations are intermittently disposed around the rung.
9. A rung substantially as described with reference to the accompanying drawings.
GB9424663A 1993-12-08 1994-12-07 Attaching a rung of a ladder to the ladder stile Withdrawn GB2285235A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939325103A GB9325103D0 (en) 1993-12-08 1993-12-08 Ladder rung production

Publications (2)

Publication Number Publication Date
GB9424663D0 GB9424663D0 (en) 1995-02-01
GB2285235A true GB2285235A (en) 1995-07-05

Family

ID=10746278

Family Applications (2)

Application Number Title Priority Date Filing Date
GB939325103A Pending GB9325103D0 (en) 1993-12-08 1993-12-08 Ladder rung production
GB9424663A Withdrawn GB2285235A (en) 1993-12-08 1994-12-07 Attaching a rung of a ladder to the ladder stile

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB939325103A Pending GB9325103D0 (en) 1993-12-08 1993-12-08 Ladder rung production

Country Status (1)

Country Link
GB (2) GB9325103D0 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA996076A (en) * 1972-01-21 1976-08-31 Leon Gubri Set including bars to put the foot, notably on ladders
US5158389A (en) * 1982-06-04 1992-10-27 Vaw Aluminium Ag Hollow section for coupling with other sections

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA996076A (en) * 1972-01-21 1976-08-31 Leon Gubri Set including bars to put the foot, notably on ladders
US5158389A (en) * 1982-06-04 1992-10-27 Vaw Aluminium Ag Hollow section for coupling with other sections

Also Published As

Publication number Publication date
GB9325103D0 (en) 1994-02-09
GB9424663D0 (en) 1995-02-01

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)