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Publication numberUS3318413 A
Publication typeGrant
Publication dateMay 9, 1967
Filing dateOct 23, 1965
Priority dateOct 23, 1965
Publication numberUS 3318413 A, US 3318413A, US-A-3318413, US3318413 A, US3318413A
InventorsKocina Lawrence A, Werner Richard L
Original AssigneeWerner Co Inc R D
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ladder joint construction
US 3318413 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

y 9, 1967 R. L. WERNER ETAL 3,318,413

LADDER JOINT CONSTRUCTION Filed Oct. 23, 1965 United States Patent 3,318,413 LADDER JOINT CONSTRUCTION Richard L. Werner, Sharon, Pa., and Lawrence A. Kocina, Simsbury, Conn., assignors to R. D. Werner Co., Inc., Greenville, Pan, a corporation of Pennsylvania Filed Oct. 23, 1565, Ser. No. 502,954 10 Claims. (Cl. 182-46) This invention relates to ladders and relates more particularly to improvements in joint constructions therefor and an improved method of assembling ladders thereby.

The improvement in this invention particularly resides in an improved ferrule for use in joints for ladders, which ladders are constructed with tubular side rails of metal or fiber glass or like material, said ferrule securely fastening rungs of fiber glass, plastic or other synthetic material, or metal to said side rails.

An object of our invention is to provide a ladder of novel construction in which the spaced lightweight metal or fiber glass side rails may be connected by rungs of fiber glass or other lightweight material in a secure manner and without danger of fracture or weakening of either the rails or the rungs in assembly or in use.

A further object of our invention is to provide an improved ladder joint construction and method of manufacture for ladders of the type referred to.

A still further object of our invention is to provide an improved ladder rail and rung assembly.

Yet another object of our invention is to provide an improved joint construction for use in ladder rail and rung assemblies which resists high axial loads and produces high torque capacity for the joint.

Other objects of our invention and the invention itself will become more readily apparent from a preview of the appended description and the accompanying drawings, in which drawings:

FIGURE 1 is a plan view of the improved ferrule of this invention, certain portions being shown in dotted lines to disclose the two-part construction thereof;

FIGURE 2 is a side view of one of said two parts of the ferrule of FIGURE 1, certain parts being shown in dotted lines for greater clarity;

FIGURE 3 is a view similar to FIGURE 2 of the other of said two parts of the ferrule of FIGURE 1;

FIGURE 4 is a top view of the ferrule part of FIG- URE 2;

FIGURE 5 is a top view of the ferrule part of FIG- URE 3;

FIGURE 6 is a view of the tubular metal or fiber glass side rail with dotted lines depicting holes in webs required to receive the ferrule;

FIGURE 7 is a sectional view of the ferrule of FIG- URE 1 in assembled relation with a fiber glass rung and fiber glass tubular rail member of a ladder.

To produce the completed joint assembly shown in FIGURE 7 tubular side rails 10 of metal, molded fiber glass, plastic or other synthetic material, are first formed preferably of rectangular box-like form having parallel spaced sides 11 and 12, and said sides are provided with aligned rung openings 13 and 14, the opening 14 being in the form shown of relatively greater diameter than the opening 13 opposite the same. As shown herein the rung openings 13 and 14 are preferably circular in form and receive the circular ferrule members 15 and 16 respectively, and circular rungs 17 therein. It is contemplated that the form of said rungs, rung openings and ferrule members may be varied; as for example, be of oval form, if desired, without departing from the invention herein shown, described and claimed. The rung illustrated herein is preferably tubular and of fiber glass material although other lightweight materials as specified hereinbefore could be utilized.

3 318,4 1 3 Patented May 9, 1 967 in our co-pending application Ser. No. 571,249, filed Aug.

9, 1966. Said annuli 18 and 19 are adapted when the ferrule parts are assembled with the rung and rail to abut portions of the rail surrounding the rung opening through which the respective ferrule parts are inserted.

The ferrule member 15 as shown is of substantially cylindrical form, the interior of the same being separated into two parts 20, 21 of different inner diameter, the portion 20 underlying the annuli 18, 19 and portions adjacent thereto, being of relatively less inner diameter than the end portion 21 extending therefrom. A shoulder 22 is thus provided between said portions or sections 20, 21 of the ferrule and said shoulder 22 is preferably curved inwardly upwardly from the portion 21 toward the merging portion 20 of the ferrule member 15.

' The second ferrule member 16, as shown and in the form illustrated in the figures herein, is cylindrical in form; the interior of the same is preferably constant diameter throughout, its outer diameter being substantially the same diameter as the inner diameter of the portion 21 of the first ferrule 15.

It is to be noted that in assembling the rail and rung, and in the form illustrated, the rung is cylindrical in form, the ferrule 15 having the preformed annuli 18 and 19 thereon are preferably press fitted over the rung 17 and an end portion 24 of said rung 17 extends outwardly thereof a short distance, the rung 17 and its associated ferrule 15 is then projected into the relatively larger rung opening 14 in the side wall 11 of the tubular rail. The ferrule part 15 is of such length that when the preformed annulus 18 abuts the outer surfaces of the wall 11 of the ladder side rail surrounding the opening 14, the outer edge 25 of the said ferrule part 15 is stopped by and abuts the inner wall surfaces of the opposite side wall 12 of the tubular rail 10 surrounding the opening 13 therein. Clearance 26 is provided between the portion 21 of the ferrule 15 and the rung 17 into which the body portion 16' of the sleeve or ferrule 16 is projected; the ferrule 16 is provided with a curved inner edge 27 and rides upon the shoulder 22. The ferrule 16 being preferably of slightly greater length than the portion 21 of the ferrule 15 into which it is press fitted, further driving force on the ferrule 16 distorts underlying portions of the rung 17 as shown at 27 and key the ferrule parts 15, 16 to the rung.

In the event further security is desired between the ferrule parts, a plurality of longitudinal grooves 28 may be provided interi-orly of the ferrule 15 and exteriorly as at 29 of the body portion 16 of the ferrule 16 in which adhesive material, such as an epoxy, may be injected. The grooves are adapted to communicate, as shown.

The improved construction of this invention will, it will be noted, suitably provide a stress and strain resistant ladder joint, with reinforcing means provided therefor to structurally strengthen those portions of the tubular side rails adjacent the rung openings, which, in the case of fiber glass ladders, is of particular importance. The rungs may be of aluminum, fiber glass, or other material, corrugated or uncorrugated, and the ferrules of aluminum or other lightweight material.

In the event the rungs are flat, rectangular, square, oval, or of other form as described, it will be understood that the openings and ferrules will be suitably formed.

We are aware that numerous and extensive departures may be made, such as size and shape, without departing however from the spirit of our invention or the scope of the appended claims.

What we claim is: I

1. A joint for a tubular ladder rail having aligned openings in spaced rail sides thereof, one of said openings beingof relatively greater diameter than said substantially opposite opening, a rung, a two-part ferrule telescoped over an end portion of said rung, said two-part ferrule comprising a first tubular member having an enlarged peripheral flange at one end projecting radially outwardly thereof, said first member having a portionrtelescoped over an end portion of a said rung in engagement therewith and a second portion telescoped over the end portion of said rung inspace'd relation thereto, the said ferrule and rung assembly projecting through the said relatively greater diameter opening in one of said rail sides, the said ferrule flange abutting portions of the rail sides surrounding said larger diameter opening and an end of said first tubular member abutting inner wall surfaces of the rail side surrounding the opening of relatively lesser diameter in said opposite rail side, said second tubular member having a portion projecting through said opening of lesser diameter and occupying the space between the second portion of said first member and the rung end portion, and having a peripheral flange at one end projecting radially outwardly thereof in abutting engagement with the outer wall surfaces of the rail side surrounding the opening of lesser diameter.

2. A joint for tubular ladders as claimed in claim 1 in which said first tubular member comprises a tubular body portion of uniform outer diameter for round rungs or equivalent dimension for non-round rungs and of variant inner diameter for round rungs or equivalent dimensions for non-round rungs.

3. A joint for tubular ladders as claimed in claim 1 wherein the portion of the second tubular member projected into the space between the first tubular member and a rung end portion has an end portion which is distorted and distorts underlying portions of the rung to key the two ferrule parts to the rung.

4. A joint for tubular ladders as claimed in claim 1 in which the first tubular ferrule is provided with a plurality of grooves and the second ferrule member is provided with a plurality of grooves, binding material being disposed within said grooves to secure said ferrule parts.

5. A joint for tubular ladders as claimed in claim 1 in which the rail sides and rungs are formed of metal.

6. A joint for tubular ladders as claimed in claim 1 in which the rail sides and rungs are formed of fiber glass.

7. A joint for tubular ladders as claimed in claim 1 in which the rail sides and rungs are formed of plastic or other synthetic materials 8. A joint for tubular ladders as claimed in claim 1 in which the rail sides are formed of metal.

9. A joint for tubular ladders as claimed in claim 1 in which the rail sides are formed of fiber glass.

10. A joint for tubular ladders as claimed in claim 1 in which the rail sides are formed of plastic or other synthetic materials.

References Cited by the Examiner UNITED STATES PATENTS 1,195,482 8/1916 Lewis 287-5207 3,115,539 12/1963 Stuessel et a1. 285-158 3,208,554 9/1965 Arnold 182-46 REINALDO P. MACHADO, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1195482 *Jan 13, 1911Aug 22, 1916 Fastening device
US3115539 *Oct 3, 1962Dec 24, 1963Flexiflor Electrical Systems IAdapter for use in an access passage for electrical wiring systems
US3208554 *Dec 2, 1963Sep 28, 1965Bauer Mfg CompanyRung and side rail connection for ladders
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3481428 *Jan 25, 1968Dec 2, 1969Coast Mfg & Supply CoLadder construction
US3502173 *Dec 9, 1968Mar 24, 1970Arnold Harold GElectrically insulated ladder
US3566992 *Jan 12, 1970Mar 2, 1971Berger Lewis WLadder
US3653697 *Aug 12, 1969Apr 4, 1972Ernst HerbertPrefabricated joint
US3674110 *Jun 1, 1970Jul 4, 1972Unitec Ind IncWound filament ladder
US4244760 *Aug 24, 1979Jan 13, 1981Smith Francis CFixing of ends of wood or reinforced plastic rungs into pultruded fibreglass reinforced plastic extension ladder stiles without the use of metal
US4492286 *May 17, 1982Jan 8, 1985Lemire David HTruck mounted ladder assembly
US4656721 *Nov 19, 1984Apr 14, 1987R. D. Werner Co., Inc.Apparatus and methods for making rail-to-rung joints for ladders and joints for other structural elements
US4746240 *Apr 1, 1987May 24, 1988General Motors CorporationSelf crimping connection for inner and outer members and method of assembling the same
US5161783 *Oct 4, 1991Nov 10, 1992German Rex LFence rail connection
US5560730 *Jun 6, 1995Oct 1, 1996Scaffold Connection CorporationScaffold system
US5882139 *Jan 10, 1997Mar 16, 1999Vallourec Composants Automobiles VitryMethod of sleeving an at least locally cylindrical part into a tubular part in a cruciform arrangement, tool for implementing said method, and assembly of two parts sleeved together by said method
US6216330Dec 15, 1998Apr 17, 2001Vallourec Composants Automobiles VitryMethod of sleeving an at least locally cylindrical part into a tubular part in a cruciform arrangement
US6290213 *Dec 9, 1999Sep 18, 2001Wildeck Mezzanines, Inc.Modular rail assembly
US6598281 *Dec 4, 2002Jul 29, 2003Krohne A.G.Method for mounting a metal body on the measuring tube of a Coriolis mass flowmeter
US7086499 *Mar 4, 2005Aug 8, 2006Wing Enterprises, Inc.Light weight ladder systems and methods
US7364017Nov 11, 2003Apr 29, 2008Wing Enterprises, Inc.Combination ladder, ladder components and methods of manufacturing same
US8069948Apr 29, 2008Dec 6, 2011Wing Enterprises, Inc.Combination ladder, ladder components and methods of manufacturing same
US8376087Dec 5, 2011Feb 19, 2013Wing Enterprises, Inc.Combination ladder, ladder components and methods of manufacturing same
EP0154850A2 *Feb 21, 1985Sep 18, 1985Oy, KarolonA method of producing scaffolds especially ladders
Classifications
U.S. Classification182/46, 29/520, 182/228.6, 403/281, 403/243, 403/282
International ClassificationE06C7/08, E06C7/00
Cooperative ClassificationE06C7/087, E06C7/085
European ClassificationE06C7/08C5, E06C7/08C3