US3762500A - Ladder - Google Patents
Ladder Download PDFInfo
- Publication number
- US3762500A US3762500A US00220195A US3762500DA US3762500A US 3762500 A US3762500 A US 3762500A US 00220195 A US00220195 A US 00220195A US 3762500D A US3762500D A US 3762500DA US 3762500 A US3762500 A US 3762500A
- Authority
- US
- United States
- Prior art keywords
- side rails
- ladder
- bracket
- vertical
- scaffold
- 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.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/48—Ladder heads; Supports for heads of ladders for resting against objects
Definitions
- ABSTRACT A ladder having a horizontal mounting bracket, including a clamping mechanism for securing the ladder to 1 Oct. 2, 1973 the vertical or horizontal frame members of a scaffold or similar structure, is adjustably mounted to the back of the ladder side rails so the ladder can be easily attached to the scaffold at any desired vertical position.
- a T-bolt member slidably disposed in each of the channel-shaped side rails, carries the ends of the bracket.
- the bracket is clamped in place against the backside of the ladder side rails by tightening a wing nut threaded onto the T-bolt member.
- the T-bolt head has curved outer ends which engage and become locked against the inside surfaces of the opposite side walls of the channels during initial tightening of the wing nut. This locking action permits the wing nuts to be fastened by one hand, thereby permitting both ends of the bracket to be easily tightened into place simultaneously.
- any variation made in the elevation of the various horizontal frame members of the end section makes the installation of the ladder sections very difficult. Also, the protruding attachment means cannot be readily removed from the ladder sections and complicates stacking of the ladder sections for transportation or storage.
- a ladder having a pair of vertical side rails and a plurality of spaced rungs, is provided with a scaffold mounting bracket which is adjustably mounted to the side rails so it can be lowered up and down the vertical length of the ladder.
- the mounting beacket includes a means for clamping the ladder to the frame 2 members of the scaffold.
- this clamping means is swivelably mounted to the mounting bracket so that the ladder can be mounted to either horizontal or vertical frame members of the scaffold.
- the side rails are preferably channel-shaped with an elongated opening.
- a T-shaped member slidably disclosed in each channel, has a longitudinal leg extending through this opening which carries one end of the mounting bracket.
- This member is provided with means, preferably a wing nut threaded onto the longitudinal leg, for clamping the mounting bracket in place against the backside of the side rails at the desired vertical position.
- the cross leg of the T-shaped member can be arranged so it becomes locked against the inside walls of the side rail channels during initial tightening of the nut. This arrangement permits each end of the bracket to be rapidly tightened into place with one hand. Hence, both ends of the bracket can be tightened into place simultaneously.
- the mounting brackets can be made to be removable from the ladder by arranging the cross leg of the T-shaped member to have a width smaller than the width of the elongated opening in the side rails. These members can then be lifted through their respective openings in the side rails after proper orientation.
- DESCRIPTION OF THE DRAWINGS F161 is a perspective, fragmentary view of two scaffold ladders embodying this invention, one shown attached to a horizontal frame member of a sectional scaffold and the other shown attached to a vertical frame member of a sectional scaffold.
- FIG. 2 is a sectioned, plan view taken along the plane designated 2-2 in FIG. 1.
- FIG. 3 is a fragmentary, sectional view taken along the plane designated 3-3 in FIG. 2.
- Ladder 10 includes a pair of channeled side rails l2, 12, a plurality of uniformly spaced rungs 14 (one shown), welded or otherwise suitably mounted to side rails 12, and a mounting bracket assembly 16 for securing the ladder to the frame members of an end section 18 of a sectional scaffold.
- Each channel shaped side rail 12 is provided with a pair of intumed retaining flanges 17, 17 having an opening 36 therebetween and each flange 17 has a small seating flange 19 formed along the edge thereof.
- FIG. 1 shows two ladders, with the ladder on the right attached to a horizontal frame member 20 and the one on the left attached to a vertical frame member 22.
- each side rail 12 can be provided with coupling members 24 over which the bottom end of the rails of another ladder section can be installed.
- This arrangement permits the length of the ladder to beextended, as required, during build up of the scaffold.
- the bottom-most section can be provided with two mounting bracket assemblies with one located near the top and the other near the bottom.
- One mounting bracket assembly located near the top is usually sufficient for the securing of the remaining ladder sections to the scaffold.
- Mounting bracket assembly 16 includes a U-shaped bracket 26 having a base portion 27 and a pair of leg portions 29,29 terminating with flat flanges 28, 28 on either end. As best shown in FIGS. 2 and 3 flanges 28 are clamped against the backside of side rails 12 by a wing nut 30 threaded onto a T-bolt, which has a flat plate head 32 disposed inside the side rail channel and a threaded stud 34 extending through elongated opening 36 and an aperture in flange 28. As shown in FIG. 3, the width of bolt head 32 is smaller than the width of opening 36. Bracket 26 is installed on ladder by orienting bolt heads 32 so they fit through opening 36 (as shown by the dashed lines in FIG.
- Opening 36 extends substantially along the entire length of side rail 12 so that, when wing nuts 30 are loosened, the mounting bracket assembly can be moved vertically along the vertical length of the side rails.
- the mounting bracket assembly can be easily positioned in any desired elevation on the ladder. This permits the ladder to be attached to the scaffold frame members in any desired vertical position.
- the mounting bracket assembly can be easily removed to facilitate stacking of the ladder sections for transportation or storage by simply loosening wing nuts 30 and rotating stud 34 so bolt heads 32 can be lifted through their respective openings 36.
- the outer end of stud 34 is peened, after the wing nut has been threaded on, so the wing nut cannot be completely removed.
- Clamp 40 is swivelably mounted to to the outer face of base portion 27 of bracket 26 so the ladder can be mounted either to a horizontal or vertical frame member of scaffold as shown in FIG. 1.
- Jaws 42, 44 of clamp 40 which are arranged to conform to the outer contour of the scaffold frame members, are hinged together at 46 so they can be opened to fit over the frame member to which the bracket is to be attached.
- Bolt 48 pivotally attached to jaw 42, extends througha slot provided in shoulder 50 on jaw 44. After the jaws have been positioned over the desired scaffold frame member, the jaws are clamped into engagement with the frame member by tightening nut 52, which is threaded onto bolt 48, to securely attach the ladder to the scaffold.
- Bracket 26 holds the ladder away from the scaffold frame member a sufficient distance to provide adequate toe room for climbing.
- mounting brackets 26 to be secured to horizontal scaffold frame members can be provided with support brackets 54 which embrace a portion of the frame member to improve stability of the ladder sections. These support brackets prevent the ladder from rocking about the swivel connection of clamp 40.
- the mounting brackets on the ladder sections to be secured to the vertical scaffold frame member do not include these support brackets because of the potential snagging hazard for workmen.
- the scaffold ladder provided by this invention has considerable versatility. It can be mounted on either vertical or horizontal frame members of the scaffold and can be positioned inside or outside the scaffold.
- the mounting bracket assembly can be easily and rapidly adjusted so the ladder can be positioned at any desired elevation; even extended above the scaffold planking if desired.
- the mounting bracket assemblies can be easily removed from the ladder to facilitate transportation and storage of the ladder sections.
- a ladder for a scaffold or the like having vertical and horizontal frame members comprising:
- mounting bracket assembly for removably attaching the ladder to a scaffold frame member, said assembly comprising a U-shaped bracket member having a base portion and a pair of leg portions extending therefrom, a pair of connector assemblies extending into the interior of said channel shaped side rails for slidably attaching the leg portions of said bracket member to said vertical side rails of the ladder at selected vertical points along the vertical length of said side rails, said connector assemblies permitting said bracket member to be vertically adjusted on said side rails without interference with said rungs, and a clamp assembly pivotally mounted on the outer face of the base portion of said bracket member at the central portion thereof, said pivotal mounting for said clamp assembly allowing said clamp assembly to swivel with respect to said bracket member so that said ladder can be attached to either a horizontal or a vertical frame member of a scaffold.
- each of said connector assemblies includes a T-shaped member having a cross-leg portion and a longitudinal leg portion, said cross-leg portion adapted for gripping engagement with the sidewalls of said channel side rails at selected vertical points along the vertical length of said side rails, and said longitudinal leg portion extending out through the open side of said channel side rails for removable connection with a leg portion of said bracket member.
- a ladder according to claim 2 in which said crossleg portion of said T-shaped members have curved outer ends for locking engagement with the sidewalls of said channel side rails.
- a ladder according to claim 2 in which said longitudinal leg portion of said T-shaped members are threaded externally to receive an internally threaded retaining member.
- a ladder according to claim 2 in which said channel side rails have a pair of inturned retaining flanges which serve to block outward movement of said T- shaped members when the cross-leg portions thereof are positioned for gripping engagement with said sidewalls of said channel side rails.
- each of said inturned retaining flanges is provided with a seating flange against which one face of said cross-leg portion seats when said cross-leg portions are positioned for gripping engagement with said sidewalls of said channel side rails.
- a ladder capable of being attached to the frame members of a sectional scaffold having vertical and horizontal frame members comprising:
- At least one horizontal mounting bracket depending outwardly from and adjustably mounted to the back side of said side rails so that the vertical position of said mounting bracket, relative to said side rails, can be varied along the vertical length of said side rails
- said mounting bracket being adjustably mounted to said side rails by a T-shaped member slidably disposed inside each of said channels, said T-shaped members having a cross-leg and a longitudinal leg, said cross-leg spanning said elongated opening in said side rails and said longitudinal leg extending through said elongated opening and carrying one of the opposite ends of said bracket, and retaining means operative with said T-shaped member for releasably clamping said bracket against the outside of said internal flanges for making vertical adjustment of said bracket; and
- clamping means mounted on said mounting bracket for securing said ladder to a scaffold frame memher.
- said cross leg is a plate having curved outer ends which engage and become locked against the inside surface of the opposite side walls of said channel, as said plate is'rotated during initial tightening of said retainer means, to prevent further rotation of said plate during further tightening of said retainer means.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US22019572A | 1972-01-24 | 1972-01-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3762500A true US3762500A (en) | 1973-10-02 |
Family
ID=22822468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00220195A Expired - Lifetime US3762500A (en) | 1972-01-24 | 1972-01-24 | Ladder |
Country Status (1)
Country | Link |
---|---|
US (1) | US3762500A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4509617A (en) * | 1981-04-27 | 1985-04-09 | The Laitram Corporation | Stair having alternate half treads |
US4546855A (en) * | 1981-10-05 | 1985-10-15 | The Bilco Company | Safety extension for a fixed ladder with an adjustable mount |
DE3816305A1 (en) * | 1988-05-13 | 1989-11-30 | Heinz Bissinger Behaelter Und | Back-protection means for a ladder |
US20060081417A1 (en) * | 2004-10-15 | 2006-04-20 | Reddco Inc. | Collapsible escape ladder |
US20080230314A1 (en) * | 2007-03-21 | 2008-09-25 | Svehlek John R | Ladder Security Bracket and Safety System |
US20080251316A1 (en) * | 2007-04-12 | 2008-10-16 | Thyssenkrupp Safway, Inc. | Scaffold access ladder bracket assembly |
US20110011675A1 (en) * | 2009-07-14 | 2011-01-20 | Bow Step, LLC | Boat trailer mounted bow entry ladder |
US20110226554A1 (en) * | 2007-08-08 | 2011-09-22 | Anderson Patrick K | Adjustable scaffold ladder bracket apparatus |
US20120080266A1 (en) * | 2010-10-01 | 2012-04-05 | Jack Brock | Mast, ladder, platform (mlp) assembly and method |
US8235174B1 (en) * | 2009-09-24 | 2012-08-07 | Pelini Mark F | Jack plate ladder |
WO2013021081A1 (en) * | 2011-08-05 | 2013-02-14 | Kaparazoom Slu | Multi-orientable device for securing portable steps |
WO2014171954A1 (en) * | 2012-05-07 | 2014-10-23 | Hoyle Gary C | Adjustable assembly for providing all-terrain support to tables and other structures |
USD757302S1 (en) | 2013-03-14 | 2016-05-24 | G. Michael Copp | Ladder bracket assembly |
US20190338589A1 (en) * | 2017-07-24 | 2019-11-07 | Sayfa R&D Pty Ltd | A modular ladder system |
US11052270B2 (en) | 2017-07-24 | 2021-07-06 | Sayfa R&D Pty Ltd | Vertical fall arrest safety device |
USD947461S1 (en) | 2019-01-30 | 2022-03-29 | Sayfa R&D Pty Ltd | Vertical fall arrest safety device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US532983A (en) * | 1895-01-22 | Ladder or stairway | ||
US2848282A (en) * | 1955-11-30 | 1958-08-19 | William M Weber | Ladder platform |
US2947555A (en) * | 1954-03-15 | 1960-08-02 | Olsen Charles | Scaffold ladder clamp |
US3028929A (en) * | 1960-03-08 | 1962-04-10 | Howard L Chubbs | Ladder attachment |
-
1972
- 1972-01-24 US US00220195A patent/US3762500A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US532983A (en) * | 1895-01-22 | Ladder or stairway | ||
US2947555A (en) * | 1954-03-15 | 1960-08-02 | Olsen Charles | Scaffold ladder clamp |
US2848282A (en) * | 1955-11-30 | 1958-08-19 | William M Weber | Ladder platform |
US3028929A (en) * | 1960-03-08 | 1962-04-10 | Howard L Chubbs | Ladder attachment |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4509617A (en) * | 1981-04-27 | 1985-04-09 | The Laitram Corporation | Stair having alternate half treads |
US4546855A (en) * | 1981-10-05 | 1985-10-15 | The Bilco Company | Safety extension for a fixed ladder with an adjustable mount |
DE3816305A1 (en) * | 1988-05-13 | 1989-11-30 | Heinz Bissinger Behaelter Und | Back-protection means for a ladder |
US20060081417A1 (en) * | 2004-10-15 | 2006-04-20 | Reddco Inc. | Collapsible escape ladder |
US9551182B2 (en) * | 2007-03-21 | 2017-01-24 | John R. Svehlek | Ladder security bracket and safety system |
US20080230314A1 (en) * | 2007-03-21 | 2008-09-25 | Svehlek John R | Ladder Security Bracket and Safety System |
US20080251316A1 (en) * | 2007-04-12 | 2008-10-16 | Thyssenkrupp Safway, Inc. | Scaffold access ladder bracket assembly |
US20110226554A1 (en) * | 2007-08-08 | 2011-09-22 | Anderson Patrick K | Adjustable scaffold ladder bracket apparatus |
US20110011675A1 (en) * | 2009-07-14 | 2011-01-20 | Bow Step, LLC | Boat trailer mounted bow entry ladder |
US8636110B2 (en) * | 2009-07-14 | 2014-01-28 | Bow Step, LLC | Boat trailer mounted bow entry ladder |
US8235174B1 (en) * | 2009-09-24 | 2012-08-07 | Pelini Mark F | Jack plate ladder |
US20120080266A1 (en) * | 2010-10-01 | 2012-04-05 | Jack Brock | Mast, ladder, platform (mlp) assembly and method |
EP2740881A4 (en) * | 2011-08-05 | 2015-05-20 | Kaparazoom Slu | Multi-orientable device for securing portable steps |
WO2013021081A1 (en) * | 2011-08-05 | 2013-02-14 | Kaparazoom Slu | Multi-orientable device for securing portable steps |
WO2014171954A1 (en) * | 2012-05-07 | 2014-10-23 | Hoyle Gary C | Adjustable assembly for providing all-terrain support to tables and other structures |
USD757302S1 (en) | 2013-03-14 | 2016-05-24 | G. Michael Copp | Ladder bracket assembly |
US20190338589A1 (en) * | 2017-07-24 | 2019-11-07 | Sayfa R&D Pty Ltd | A modular ladder system |
US11052270B2 (en) | 2017-07-24 | 2021-07-06 | Sayfa R&D Pty Ltd | Vertical fall arrest safety device |
US11091957B2 (en) * | 2017-07-24 | 2021-08-17 | Sayfa R&D Pty Ltd | Modular ladder system |
USD947461S1 (en) | 2019-01-30 | 2022-03-29 | Sayfa R&D Pty Ltd | Vertical fall arrest safety device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIGGIE INTERNATIONAL INC. Free format text: CHANGE OF NAME;ASSIGNOR:A-T-O INC.;REEL/FRAME:003866/0442 Effective date: 19810623 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
|
AS | Assignment |
Owner name: FIGGIE INTERNATIONAL INC. Free format text: MERGER;ASSIGNOR:FIGGIE INTERNATIONAL INC., (MERGED INTO) FIGGIE INTERNATIONAL HOLDINGS INC. (CHANGED TO);REEL/FRAME:004767/0822 Effective date: 19870323 |
|
AS | Assignment |
Owner name: AMERICAN LAFRANCE, LLC, SOUTH CAROLINA Free format text: PATENT ASSIGNMENT AGREEMENT;ASSIGNOR:LADDER TOWERS, INC.;REEL/FRAME:016945/0245 Effective date: 20051214 |
|
AS | Assignment |
Owner name: PATRIARCH PARTNERS AGENCY SERVICES, LLC, NORTH CAR Free format text: PATENT COLLATERAL SECURITY AGREEMENT;ASSIGNOR:AMERICAN LAFRANCE, LLC;REEL/FRAME:017154/0385 Effective date: 20051214 |
|
AS | Assignment |
Owner name: PATRIARCH PARTNERS AGENCY SERVICES, LLC, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN LAFRANCE, LLC;REEL/FRAME:032060/0414 Effective date: 20140124 |
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AS | Assignment |
Owner name: ICONIC AMERICAN TRUCKS, LLC, SOUTH CAROLINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PATRIARCH PARTNERS AGENCY SERVICES, LLC;REEL/FRAME:032073/0470 Effective date: 20140124 |
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AS | Assignment |
Owner name: PATRIARCH PARTNERS AGENCY SERVICES, LLC, NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNOR:ICONIC AMERICAN TRUCKS, LLC;REEL/FRAME:032137/0435 Effective date: 20140124 |