GB2265764A - Cable ladder - Google Patents
Cable ladder Download PDFInfo
- Publication number
- GB2265764A GB2265764A GB9305980A GB9305980A GB2265764A GB 2265764 A GB2265764 A GB 2265764A GB 9305980 A GB9305980 A GB 9305980A GB 9305980 A GB9305980 A GB 9305980A GB 2265764 A GB2265764 A GB 2265764A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stringers
- beads
- cable ladder
- rungs
- stringer
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0456—Ladders or other supports
Abstract
A cable ladder comprising two channel-section stringers interconnected by rungs has the bases of the channel- sections facing each other and formed with embossed beads 4, 4' extending at right angles to the general plane of the ladder. The ends of the rungs are welded to the stringers. In preferred arrangements, the beads in each stringer are arranged in pairs and the two ends of each rung are welded to the stringers between the two beads of a pair. <IMAGE>
Description
CABLE LADDERS
The present invention relates to cable ladders. Such a cable ladder comprises two longitudinal stringers or beams, which are often formed with outwardly directed flanges, and which are kept mutually spaced by means of lateral connection members in the form of rungs spaced apart along the length of the cable ladder. Usually, the stringers and/or rungs are formed with apertures in order to save weight and/or to facilitate the attachment of clamps or bolt connections for retaining cables, instrument pipes etc. to the cable ladder.
A disadvantage in known cable ladders of this kind is that they withstand little load within their main plane (horizontal plane - prior to being mounted) without becoming distorted. Also bending strength as well as the torsional strength is deficient.
Therefore, it has been the object of the present invention to construct a cable ladder the general mechanical/static strength of which is increased substantially by simple and inexpensive means.
According to this invention there is provided a cable ladder comprising two longitudinal stringers spaced apart and interconnected by rungs spaced apart along the length of the stringers, the stringers being formed with reinforcing beads extending transversely of the lengthwise dimension of the stringers and at least some of the rungs being secured to the stringers adjacent the beads.
Thus, in preferred embodiments of the invention, the stringers of the cable ladder are formed with reinforcing beads which are formed directly in the plate material, at least some of the cable ladder rungs having their ends welded to the stringers adjacent the reinforcing beads.
Through embossing or stamping or impressing such beads, the bending and torsional strength of the cable ladder is increased substantially in relation to conventional cable ladders of corresponding dimensions.
A further increase in the strength of the cable ladder can be achieved by welding each end of each rung to two adjacent beads, whereby the risk of being bent inwards or outwards is greatly reduced.
However, a sufficient strength and stability increase can be obtained if each rung has each end thereof disposed adjacent one bead or if there is only one bead for each rung end for alternate rungs.
One embodiment of the invention is further explained in the following, reference being made to the accompanying drawings, wherein:
Figure 1 shows in a perspective view a portion of a cable ladder constructed in accordance with the invention, seen obliquely from above, and
Figure 2 shows in plan view the cable ladder portion of Figure 1.
The cable ladder shown in Figures 1 and 2 comprises two metal longitudinal channel-section stringers 1, 1 disposed with their bases facing each other and having outwardly directed side flanges 2, 2'.
The stringers 1, 1 are, as known, formed with a large number of apertures which are inessential to the present invention and which, therefore, are not denoted by reference numerals.
The stringers 1, 1 of the cable ladder are kept mutually spaced by means of lateral connection members in the form of cable ladder rungs 3, 3'.
The base portions of the stringers 1, 1 are formed with beads 4 which extend transversely of the lengthwise dimension of the stringers and which are impressed or embossed on the plate material of the stringers 1, 1'. The beads are distributed along the length of the stringers 1, 1 . At the impressed side in the drawing, the beads 4 are denoted 4 .
The lateral beads 4, 4 themselves result in a substantial increase in the bending strength and torsional strength of the stringers and, consequently, of the cable ladder.
In the illustrated preferred embodiment of the invention, the reinforcing beads 4, 4 are distributed such that pairs of beads on each stringer 1, 1 i.a. are positioned in the region of the attachment of the cable ladder rungs 3, 3'. Thus, in this embodiment, each end of each rung 3, 3 is welded between the two beads of a pair, resulting in a further increase of the strength and stability of the cable ladder.
However, a sufficient increase of the torsional strength/bending strength of the cable ladder is achieved when the rungs 3, 3 are welded in the region of one bead on each stringer, or when only some of the rungs are welded in the region of such beads.
Claims (6)
1. A cable ladder comprising two longitudinal stringers spaced apart and interconnected by rungs spaced apart along the length of the stringers, the stringers being formed with reinforcing beads extending transversely of the lengthwise dimension of the stringers and at least some of the rungs being secured to the stringers adjacent the beads.
2. A cable ladder as claimed in claim 1, wherein the side stringers are made from metal strip and the beads are impressed or embossed on the strip, at least some of the rungs being welded to the stringers adjacent the beads.
3. A cable ladder as claimed in claim 2, wherein each rung is welded to each of the stringers adjacent a bead in the stringer.
4. A cable ladder as claimed in any one of the preceding claims, wherein the beads in each stringer are formed in pairs and wherein the two ends of each rung are secured to the respective stringers between the beads of a pair.
5. A cable ladder as claimed in claim 1, wherein each stringer is of channel-section form, the bases of the channels in the two stringers facing each other and wherein the reinforcing beads in each stringer are formed in the bases of the channels.
6. A cable ladder substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO921262A NO175335C (en) | 1992-04-01 | 1992-04-01 | cable ladder |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9305980D0 GB9305980D0 (en) | 1993-05-12 |
| GB2265764A true GB2265764A (en) | 1993-10-06 |
| GB2265764B GB2265764B (en) | 1995-08-30 |
Family
ID=19895025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9305980A Expired - Fee Related GB2265764B (en) | 1992-04-01 | 1993-03-23 | Cable ladders |
Country Status (4)
| Country | Link |
|---|---|
| FR (1) | FR2689561B1 (en) |
| GB (1) | GB2265764B (en) |
| NL (1) | NL9300511A (en) |
| NO (1) | NO175335C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006125907A2 (en) | 2005-05-27 | 2006-11-30 | Ebo Systems | Support device for electric cables or other conduits |
| WO2019035722A1 (en) * | 2017-08-16 | 2019-02-21 | Øglænd System As | A support bracket for attachment to a precast hollow concrete element |
| US11038324B2 (en) | 2018-07-19 | 2021-06-15 | Panduit Corp. | Ladder rack with integral cable cleat |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574169A (en) * | 2012-07-31 | 2014-02-12 | 上海程通机电厂 | Cable tray |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2226606A1 (en) * | 1973-04-17 | 1974-11-15 | Krieg Zivy Ind | Ladder type support for cables and conduits - has ends of spacers engaging in slots in grooves of longerons |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2829905C3 (en) * | 1978-07-07 | 1982-03-11 | Neuwalzwerk Bettermann Ohg, 5750 Menden | Cable ladder |
| AU609866B2 (en) * | 1987-09-16 | 1991-05-09 | Siemens Ltd. | Cable ladder |
-
1992
- 1992-04-01 NO NO921262A patent/NO175335C/en unknown
-
1993
- 1993-03-23 NL NL9300511A patent/NL9300511A/en unknown
- 1993-03-23 GB GB9305980A patent/GB2265764B/en not_active Expired - Fee Related
- 1993-03-31 FR FR9303779A patent/FR2689561B1/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2226606A1 (en) * | 1973-04-17 | 1974-11-15 | Krieg Zivy Ind | Ladder type support for cables and conduits - has ends of spacers engaging in slots in grooves of longerons |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006125907A2 (en) | 2005-05-27 | 2006-11-30 | Ebo Systems | Support device for electric cables or other conduits |
| WO2006125907A3 (en) * | 2005-05-27 | 2007-04-19 | Ebo Systems | Support device for electric cables or other conduits |
| WO2019035722A1 (en) * | 2017-08-16 | 2019-02-21 | Øglænd System As | A support bracket for attachment to a precast hollow concrete element |
| US11038324B2 (en) | 2018-07-19 | 2021-06-15 | Panduit Corp. | Ladder rack with integral cable cleat |
Also Published As
| Publication number | Publication date |
|---|---|
| NO921262D0 (en) | 1992-04-01 |
| GB2265764B (en) | 1995-08-30 |
| GB9305980D0 (en) | 1993-05-12 |
| NO921262L (en) | 1993-10-04 |
| NL9300511A (en) | 1993-11-01 |
| NO175335C (en) | 1994-09-28 |
| NO175335B (en) | 1994-06-20 |
| FR2689561B1 (en) | 1997-01-17 |
| FR2689561A1 (en) | 1993-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990323 |