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Publication numberUS1385319 A
Publication typeGrant
Publication dateJul 19, 1921
Filing dateApr 14, 1920
Priority dateApr 14, 1920
Publication numberUS 1385319 A, US 1385319A, US-A-1385319, US1385319 A, US1385319A
InventorsEnke Martin F
Original AssigneeEnke Martin F
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1385319 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




Patented July 19,1921. 1

[ZZZ/11272301. y



Application filed April 14, 1920.

To all whom it may concern:

.Be it known that I, MARTIN F. ENKE, citizen of the United States, residing at Oakland, in the. county of Alameda and State of California, have invented certain new and useful Improvements in Ladders, of which the following is a specification.

This invention relates to improvements in ladders and more particularly to a ladder adapted for use on incline surfaces such as is frequently found in side hill orchards.

Another object of my invention is to provide a ladder which Wlll stand alone, which is light in weight, simple in construction and which is easily adjusted when used in positions where the supporting surface is inclined.

With these and other objects in view, the invention consists in the novel construction, combination and arrangement of parts herein illustrated and more particularly pointed out in the appended claims.

Reference being had to the accompanying drawings forming a part of this specification:

Figure 1 is a view in perspective showing my improved ladder in its upright position and standing on a substantially level surface.

Fig. 2 is an enlarged view in perspective of my improvement showing the manner of holding the upper ends of the auxiliary feet.

Fig. 3 is a View in front elevation showing the same as arranged for use on an ineline surface.

Referring to corresponding parts of the several views by the same numerals of reference, 1 and 2 denote the side bars of my imroved ladder having steps 3. While I have illustrated broad steps it will be understood that rungs may be used as in an ordinary ladder. To enable the ladder thus formed to be supported in an upright position without leaning it against a building, tree or other object, I provide the brace member 4 on the top of which is secured bars 5 which are pivotally mounted on a rod 6 extending across the top of members 1 and 2.

It is often desirable to use a ladder in a position where the supporting surface is inclined in such a direction that if members 1 and 2 rested thereon the ladder would not stand vertically. To provide for such cases the auxiliary supporting members 7 are secured to the side members 1 and 2. Each Specification of Letters Patent.

Patented July 19, 1921. Serial No. 373,879.

of these supports consists of a flat member having a metallic plate at the upper end with upwardly e:-;te1'1ding companion ends 14 plvotally connected to the sliding sleeve 12 wherein the spring actuated pawl 11 has its bearing. The spring 13 is for the purpose of locking or releasing the pawl 11 as it engages with the plurality of perforations 10 enabling the upper end of member 7 to be secured at any desired position along the rack 9, the rack 9 being rigidly secured to the sides of members 1 and 2. I

The spring pawl 11 may be released from the rack 9 by a slight pressure on its lower curved end, thereby enabling the auxiliary legs 7 to be folded upward to the body of the ladder. I

The lower ends of members 7 are connected to the lower end of the ladder by means of links 15 which are pivotally se cured at one end to the lower step of the ladder and on the other ends of member 7 adjacent the bottom. Said links serve to maintain the legs in such position that the long tudinal median lines thereof are approximately opposite the longitudinal me dian lines of the side bars of the ladder. Blocks 16 are attached on the bottom of members 1 and 2, giving to the ladder greater bearing surface and also when members 7 are in their folded position to provide a substantially flush surface as the lower end of members 7 fold in above these blocks.

When this ladder is to be used on an uneven surface such as is shown in Fig. 3 the spring pawl 11 is disengaged from the rack 9, and when the ladder is stood in a vertical position the members 7 are moved downward by a slight pressure with the foot on the lug 17 until their lower ends rest on the round. Thus on the upper side of the incline the one ladder leg and one member 7 bear on the ground, while on the lower side only the members 7 rest on the sup porting surface. In this position the spring pawl 11. engaging the perforations 10 looks automatically and the ladder is thus supported in the vertical position, the weight on the lower side being supported by the auxiliary leg 7. The upper ends of the members 7 cannot move, due to the manner of binding them to the sides of the ladder, while the lower ends are held through the links 15. When the ladder is not in use these members 7 may be folded flat against the side bars 1 and 2 and the supporting legi is folded flat against the steps, thus making the device compact and readily handled.

l Vhile I have shown the preferred embodiment of my invention it will be understood that minor changes may be made in detail and construction without departing from the scope of the claims.

I claim as new and wish to cover by Letters Patent:

1. An improved ladder comprising a ladder body having side bars provided with an elongated rack, said rack having a plurality of perforations, auxiliary legs provided with a sliding-sleeve pivotally attached to the upper ends thereof, a spring pawl within the sliding sleeve, and adapted to engage the perforations in said elongated rack, said auxiliary legs may be adjusted to swing in an are from the ladder body substantially as specified.

2. An improved ladder comprising a ladder body, auxiliary legs provided with a sliding sleeve at their upper ends, a springactuated pawl within said sliding sleeve and means for detachably CODI'XGCtlllQ' said pawl to the ladder body, said in 11118 being adjustable longitudinally of said ladder body substantially as set forth.

In testimony whereof I aliix my sigrna tnre.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4147231 *Sep 26, 1977Apr 3, 1979Chantler Douglas ALadder stabilizing device
US4244446 *Oct 15, 1979Jan 13, 1981Mair George RAdjustable ladder support
US4519477 *Nov 15, 1983May 28, 1985Robert RalstonLadder stabilizing apparatus
US4798262 *Sep 12, 1986Jan 17, 1989Paul MargoliesTripodal support
US6419047 *Jul 31, 2000Jul 16, 2002Harold Frederick AdsheadPortable ladder having resistance to slippage
US7093690Aug 27, 2004Aug 22, 2006Swann Jeffrey JLadder stabilizer
US8365865 *Feb 26, 2010Feb 5, 2013Wing Enterprises, Inc.Adjustable ladders and related methods
US8485316 *Apr 3, 2009Jul 16, 2013Lock N Climb, LlcCollapsible safe ladder
US8701828 *Aug 5, 2010Apr 22, 2014Martin S MatthewStable stepladder with utility tray
US8973710 *Jan 3, 2013Mar 10, 2015Wing Enterprises, IncorporatedAdjustable ladders and related methods
US9038776Sep 8, 2011May 26, 2015Lock N Climb, LlcCollapsible safe ladder
US9145733 *Jan 24, 2014Sep 29, 2015Wing Enterprises, Inc.Adjustable ladders and related components
US20060054398 *Aug 27, 2004Mar 16, 2006Swann Jeffrey JLadder stabilizer
US20100252364 *Apr 3, 2009Oct 7, 2010Vestal Floyd LavernCollapsible safe ladder
US20100300805 *Feb 26, 2010Dec 2, 2010Wing Enterprises, IncorporatedAdjustable ladders and related methods
US20110017548 *Sep 8, 2010Jan 27, 2011Jeffrey GreenCollapsible safe ladder
US20130118833 *Jan 3, 2013May 16, 2013Wing Enterprises, IncorporatedAdjustable ladders and related methods
US20140202793 *Jan 24, 2014Jul 24, 2014Wing Enterprises, IncorporatedAdjustable ladders and related components
USD668789Oct 9, 2012Lock N Climb, LlcSupport rail for a ladder
USD745191May 27, 2014Dec 8, 2015Lock N Climb, LlcLadder
WO1985002440A1 *Nov 21, 1984Jun 6, 1985John Edgar MurrellSafety ladder
U.S. Classification182/172, 182/169, 182/200
International ClassificationE06C1/20, E06C1/00
Cooperative ClassificationE06C1/20
European ClassificationE06C1/20