US3109512A - Stepladder - Google Patents

Stepladder Download PDF

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US3109512A
US3109512A US137089A US13708961A US3109512A US 3109512 A US3109512 A US 3109512A US 137089 A US137089 A US 137089A US 13708961 A US13708961 A US 13708961A US 3109512 A US3109512 A US 3109512A
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edge
supplemental
legs
stationary
tread
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US137089A
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Alva R Tilton
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Alva R Tilton
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    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C7/00Component parts, supporting parts, or accessories
    • E06C7/16Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms

Description

Nov. 5, 1963 Filed Sept. 11
A. R. TILTON STEPLADDER 2 Sheets-Sheet 1 FIG I FIG 4 IN VEN TOR.
ALVA R. TILTON owl-m, mukg llonnelly ATTORNEYS United States Patent 3,109,512 STEPLADDER Alva R. Tilton, 26 S. Franklin, Chagrin Falls, Ohio Filed Sept. 11, 1961, Ser. No. 137,089 Claims. (Cl. 182120) The present invention relates to stepladders and, more particularly, to an auxiliary or supplemental step designed to supplement a usual stationary step, thereby to provide a wider surface for the support of a user.
Supplemental steps of this nature are generally disposed to constitute rear extensions of the stationary steps when the ladder is in its open operative condition and, in order not to prevent or unduly interfere with normal folding of the ladder, these extensions must themselves be foldable into the space occupied by the ladder when collapsed. The prior constructions of this type with which I am familiar relay on complicated systems of levers thus to foldably support supplemental steps, thereby adding considerably to the cost of the stepladder and often compromising the strength of the support to obtain the desired folding action.
It is a primary object of my invention to provide a foldable supplemental step in a ladder supported in a relatively inexpensive but extremely secure and rugged manner.
Another object of the invention is to provide a supplemental step construction of this nature which can readily be applied to existing ladders as well as incorporated, if desired, in the manufacture of new ladders and which can easily be removed therefrom when their presence is not desired.
Other objects and advantages of the present invention will become apparent as the following description proceeds.
To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.
In said annexed drawings:
FIG. 1 is a side elevational view of a stepladder incorporating one form of my improved supplemental step construction;
FIG. 2 is a fragmentary perspective view of the supplemental step assembly shown on the ladder of FIG.
FIG. 3 is an end sectional view of the assembly of FIG. 2 shown attached to a stationary step and leg of the ladder of FIG. 1;
FIG. 4 is an end sectional view of the assembly of FIG. 3 showing the supplemental step in its folded or withdrawn position;
FIG. 5 is a sectional view taken along line 5--5 of FIG. 3;
FIG. 6 is a sectional plan view taken along line 66 of FIG. 1;
FIG. 7 is an end sectional view similar to FIG. 3 showing another form of the invention; and
FIG. 8 is a sectional view similar to FIG. 5 taken along line 88 of FIG. 7.
Referring now to the drawings in detail and, in particular, to FIGS. 1 through 6, the structure there illustrated comprises a standard stepladder having two front legs 10, an upper platform 11 and two rear legs 12. The legs are securely attached to the platform by means of the angle members 13, while the rear legs 12 are pivotally attached by pins 14 to the angle members. The rear legs can, therefore, be moved toward and away from 3,109,512 Patented Nov. 5, 1963 a the front legs, respectively, to close and open the ladder in the usual manner.
The ladder also has a plurality of conventional stationary steps 15 extending between the two front legs, and a folding shelf 16 pivotally connected at 17' to the rear legs and adapted to abut the underside of the uppermost step 15 in the open condition of the ladder as shown. Center braces 18 are provided between the front and rear legs having two metal straps pivotally attached to the front and rear legs and interconnected centrally by a pivot pin.
Supplemental step 20 is shown as an inverted flat channel member having its longitudinal front edge adjacent the rear edge of one of said stationary treads 15. The supplemental step has a pair of pins 21 projecting from the ends of its longitudinal front edge and the rear lon gitudinal edge of the supplemental step 20 also has a pair of pins 22 projecting therefrom; these pins, of course, may be replaced by rods extending through the entire length of the step. Two attaching plates 23 are connected respectively to the inner sides of the front legs 10 by bolts 24. Each attaching plate has a notch in its bottom edge terminating at the rear by a lower depending portion 25. When a plate 23 is mounted, the notch engages the stationary step 15 along the rear edge of the latter with the portion 25 extending therebelow. The front edge pins 21 are pivotally connected to the plates 23 through these rear portions 25. Two links or bars 26 are provided having laterally off-set halves in which slots 27 and 28 are formed. Rear edge pins 22 extend through the lower slots 28 of the links and are pivotally connected therein and also for sliding movement throughout the length of the slot. Upper slots 27 are engaged by the bolts 24 for similar sliding and pivotal action. When the supplemental step 20 is to be folded or withdrawn, as shown in FIG. 4, the rear edge pins 22 slide up the slots 28 and the bars 26 move upwardly with bolts 24 sliding in upper slots 27. The above described lateral oifset of the bars 26 permits the projecting portions of the pins 22 to pass within and between the plates 23 to effect a complete retraction of the supplemental step assembly between the front legs 10.
FIGS. 7 and 8 illustrate an alternative embodiment of the invention wherein a chain 30 is substituted for each slotted link or bar 26. In this embodiment, the rear edge pins 22 will be replaced by rear edge hooks 31 which are connected to the lower links of the chains. In the same manner, bolts 24 will be replaced by hook bolts 32 attached to the upper links of the chains 30. When the supplemental step of this embodiment is folded or withdrawn, the chains 30 .become slack permitting full retraction of the step.
Desirably, the supplemental step assembly of this invention will be sold as a unit consisting of a supplemental step connected to a pair of attaching plates and supporting members as shown in the drawings. The unit may be attached by the purchaser to any conventional stepladder by merely boring a single hole through each front leg of the ladder and mounting the attaching plates thereto with bolts as described above.
Through the use of the above described supplemental step assembly, the objects of this invention have been achieved in an eflicient and economical manner which provides for simplicity of installation and operation.
Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims or the equivalent of such be employed.
I therefore, particularly point out and distinctly claim as my invention:
1. A supplemental tread assembly for use on a stepladder comprising a pair of attaching plates adapted to be connected to the front legs of such stepladder, a supplemental tread pivotally connected between said plates along a front edge of said tread, and a pair of supporting members each pivotally connected at one end to one of said plates and at its other end to said supplemental step along the rear edge thereof, whereby said step is adapted to be folded upwardly.
2. A supplemental tread assembly according to claim 1 wherein said supporting members are bars having longitudinal slots through which the said connections vare made.
3. A supplemental tread assembly according to claim 2 wherein the lower portions of said bars are laterally offset inwardly with respect to said plates.
4. A supplement-a1 tread assembly according to claim 1 'wherein each of said attaching plates is notched along its base to provide a rearwardly downwardly extending portion through which the pivotal connection to said front edge of said supplemental step is made.
5. In a folding stepladder having front and rear legs pivotally related in conventional manner and a plurality of stationary treads supported by the front legs thereof; an attaching plate connected to one of said front legs,
said attaching plate being notched along its base, said notched portion engaging one of said stationary treads along its rear edge, said plate having a portion extending partially below the rear edge of said one stationary tread, a supplemental tread having a longitudinal front edge adjacent the rear edge of said One stationary tread pivotally connected to said attaching plate through said portion thereof extending partially below said rear edge of said one stationary tread, and a supporting member pivotally connected at one end to said plate and at its other end to said supplemental step along the rear edge 7 thereof whereby the latter is adapted to be folded upwardly.
References Cited in the file of this patent UNITED STATES PATENTS 324,254 Hendrickson Aug. 11, 1885 720,891 Hall et a1. Feb.'17, 1903 1,462,086 Echli n July 17, 1923 2,804,355 Bartley Aug. 27, 1957 FOREIGN PATENTS 116,579 Great Britain June 20, 1915

Claims (1)

  1. 5. IN A FOLDING STEPLADDER HAVING FRONT AND REAR LEGS PIVOTALLY RELATED IN CONVENTIONAL MANNER AND A PLURALITY OF STATIONARY TREADS SUPPORTED BY THE FRONT LEGS THEREOF; AN ATTACHING PLATE CONNECTED TO ONE OF SAID FRONT LEGS, SAID ATTACHING PLATE BEING NOTCHED ALONG ITS BASE, SAID NOTCHED PORTION ENGAGING ONE OF SAID STATIONARY TREADS ALONG ITS REAR EDGE, SAID PLATE HAVING A PORTION EXTENDING PARTIALLY BELOW THE REAR EDGE OF SAID ONE STATIONARY TREAD, A SUPPLEMENTAL TREAD HAVING A LONGITUDINAL FRONT EDGE ADJACENT THE REAR EDGE OF SAID ONE STATIONARY TREAD PIVOTALLY CONNECTED TO SAID ATTACHING PLATE THROUGH SAID PORTION THEREOF EXTENDING PARTIALLY BELOW SAID REAR EDGE OF SAID ONE STATIONARY TREAD, AND A SUPPORTING MEMBER PIVOTALLY CONNECTED AT ONE END TO SAID PLATE AND AT ITS OTHER END TO SAID SUPPLEMENTAL STEP ALONG THE REAR EDGE THEREOF WHEREBY THE LATTER IS ADAPTED TO BE FOLDED UPWARDLY.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294197A (en) * 1964-09-03 1966-12-27 Rudolph J Kwiatkowski Perch for a ladder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US324254A (en) * 1885-08-11 Ed ward l
US720891A (en) * 1902-09-18 1903-02-17 Hoskins & Son Ltd Folding ladder.
GB116579A (en) * 1917-07-07 1918-06-20 Alfred Charles Smith Improvements in Cripples for use by Builders and others.
US1462086A (en) * 1922-10-13 1923-07-17 Philander M Echlin Ladder attachment
US2804355A (en) * 1955-05-27 1957-08-27 John J Bartley Auxiliary step and supporting brackets for attachment to ladders

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US324254A (en) * 1885-08-11 Ed ward l
US720891A (en) * 1902-09-18 1903-02-17 Hoskins & Son Ltd Folding ladder.
GB116579A (en) * 1917-07-07 1918-06-20 Alfred Charles Smith Improvements in Cripples for use by Builders and others.
US1462086A (en) * 1922-10-13 1923-07-17 Philander M Echlin Ladder attachment
US2804355A (en) * 1955-05-27 1957-08-27 John J Bartley Auxiliary step and supporting brackets for attachment to ladders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294197A (en) * 1964-09-03 1966-12-27 Rudolph J Kwiatkowski Perch for a ladder

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