US1587383A

US1587383A - Convertible ladder

Info

Publication number: US1587383A
Application number: US26266A
Authority: US
Inventors: Kennett Charles Edward
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-09-22
Filing date: 1925-04-27
Publication date: 1926-06-01
Anticipated expiration: 1943-06-01
Also published as: GB254451A

Description

June 1,1926. 1587,38?,

` C. E. KENNETT CONVERTIBLE LADDER Filed April 27, 1925 f 1 /3 d /f 7 f :4 l 18 l u NN" Z /0 2 \\\3/ y l m a 7 l 5 n 20 O\ /l ff 6, i (/f o .f l o Affgn Patented June l, 1926.

isaiasi CHARLES EDWARD KENNE'IT, 0F SOUTH MELBOURNE, VICTORIA, AUSTRALIA.

CONVERTIBLE LAEDER.

Application filed April 27, 1925, Serial N o. 26,286,aiid in Australia Septcinberz, 1324.

rlhis invention relates to improvements in com'ertible ladders having two hingedly connected sections so arranged that the same can b-e brought into alignment in prolongation of the main ladder section to provide a wall ladder, and when a step-ladder is required the upper hinged section is downwardly folded to function as a strut, provision being made to securely lock the said ladder' sections in either required position.

The present invention has been devised -to provide a convertible ladder of simple, specially durable and economical construction, and included amongst its objects are the f provision of improved means for locking the ladder sections in selected relative positions, reinforcing means toobviate splitting of the side bars of said ladder sections, and improved means for preventing accidental spread of said sections when the ladder is converted for use as a step-ladder.

According to theinvention, I provide a convertible ladder formed of two sectionsone having steps and the other furnished with rungs. Fitted to each of said sections are hinge pieces pivotally secured together. @ne of the hinge pieces is formed with holes and an arcuate slot to register with a series of adjustment holes in the opposed hinge piece, and locking members passed through said holes or the arcuate slot in one hinge piece and through one ofk the adjustm-ent holes in the other hinge piece rigidly lock the ladder sections in selected relative positions. Reinforcing metal clips are fitted to the ends of the side bars of the ladder sections to obviate splitting around the hinge pieces when the ladder is subjected to heavy strains. Pivotally connected to one of the rungs of the upper ladder section is a locking platform member having a hoolr adapted" to lit around and grip one of the steps of the lower ladder section to prevent accidental spread of the hinged sections when converted to a stepladder.

Reference is made to the accompanying drawings, wherein Figure 1 is a view in front elevation of a convertible ladder according to the invention, showing the two hingedly connected sections locked in alignment to provide a wall ladder.

Figure 2 is a perspective view illustrating the ladder seen in Figure 1 converted for use as a step-ladder.

Figure 8 is a sectional view illustrating the locking platform member for preventing spread of the ladder sections when converted to a step-ladder- Figure f1- is a detail view in side elevation showing the hinge connection between the ladder sections when placed in alignment as shown in Figure l. j

Figures 5 and 6 are perspective views of th'e hinge pieces connecting the ladder sections.

The improved convertible ladder comprises a lower main section 5 provided with a series of steps, and an upper movable section 6 ordinarily having rungs such as are used in wall-ladders. The two ladder sections are hingedly connected together at opposite sides by hinge devices, each of which comprises two

hinge pieces

7 and 8 having angular extensions 9. Said

hinge pieces

7 and 8 are apertured to receive bolts 10, by which they are aiiixed to the outer surfaces and adjacent to-the ends of the side bars 11 of the ladder sections.

At the extremities of the angular eXtensions 9 of the hinge pieces there are provided flat bearing portions 12 of approximately circular configuration. The fiat portions 12 of the hinge pieces 8 that are secured to the upper ladder sectionG are in alignment with the angular extensions 9 of said hinge pieces, but the iat portions 12 of the hinge pieces 7 secured to the lower ladder section are offset or stepped as at 13 from the angular extensions 9 to provide snug seatings to accommodate the flat portions of the hinge pieces 8.

Formed centrally in the flat bearing portions 12 of each of the hinge pieces 7 and 8 a hole 141, through which is passed a rivet 15 to pivotally connect the hinge pieces together. Formed in the fiat portions 12 of the hinge pieces 8 fitted to the upper ladder section 6 are four spaced holes 16 while on the flat portions 12 of the offset hinge pieces 7 secured to the lower ladder section 5 there are formed two holes 17 and an arcuate slot 18.

When the

lladder sections

5 and 6 are placed in alignment to provide a wall ladder, the ends of the side bars 11 are inabutment, and a hole 17 of each of the odset hinge pieces 7 registers with a hole 1G of the opposed hinge pieces 8. Pins 19 are then inserted through said registering holes to rigidly lock the two ladder sections together. These pins are of curved shape and they are attached to chains 20 which are fastened to the lorver ladder section 5.

The holes 16 in the hinge neces 8 and the holes 17 and the arcuate slots 18 formed in the hinge pieces .7 are so spaced that when the upper ladder section 6 is folded downwardly as is shown in Figure 2 to provide a step-ladder, said arcuate slots 18 register with the holes 16 and permit the inserti-on of, the pins 19 to prevent spreading of the ladder sections.

wWhen the ladder Converted to a stepladder. the arcuate slots 18 in the hinge pieces "i" enable a wide range of anguiar adjustments ot the ladder sections to be obtained, Without removing' the pins 1S). Thus the sections can be tightly folded together to assist in the portability ot the ladder. The provision oit-a number et holes 16 and 1T in the hinge pieces enables the ladder sections to be locked .at a position other than shown in Figures 1 and Q, as for example :it a midway position, so that when required the ladder can be used in forming 'a scal'fold for operatives.

lia-letal reinforcing clips 21 of lil-shape are tilted around the 'ends of the side bars 11 oi' the ladder sections and prevent them from splitting` around the liinge-liiieces 'T and 8, when the ladder is bearing` a heavy load. These clips are affixed by the bolts 10, which secure the hinge-pieces to the said side members.

fr tlf-it locking` member formed pr'eili'erably of Wood, is pivotally mounted upon the lowermost rung` 23 oi the upper ladder section 6 by means of metal hinge straps 24. These hinge straps have circular shaped ends 25 to lit loosely around the ladder rung 23. and they are secured in shallow grooves 9,6 'formed on the underneath surface of the locking niei'nber 225 and lie flush therewith.

Secured to said locking member 22 is a metal bar 27 having a 'hooked end 2S designed to lit around the uppermost step 29 of the main `ladder section 5.

Then the ladder has been converted for use as a step-ladder, the 'lat locking member 2,2 is first. swung around upon the rung Q3 so that it rests upon the uppermost step 2l) of the ladder section 5. The ladder sections are then moved inwardly toward cach other to cause the hooked end 28 o't' the metal bar 27 on said locking member to iit beneath the step 29 and thus lock together the ladder .sections and restraining them from spreading.

'il he pivoted flat member 22, While providing additional locking; means 'for the ladder secti s, also serves as a plattorm for supporting,` tools, receptacles and utensils required by Workmen, when using` the lad der as a step-ladder.

`When the ladder is being converted to a wall ladder, the hooked end 9,8 ci the metal bar 2T is lirst disengaged from the ladder step 29 and the pivoted locking member is then swung around so that it depends from the lowermost rung ot the upper ladder section 6 and tits betr-reen said rung and the uppermost step 29 ot the lovfcr section 5, Without presenting` any obstruction a person ascending` or descending the Wall ladder.

lVhat l do claim is:

An improved convertible ladder, compri;- ing independent ladder sections, hinged members carried by the sections and operative to permit the sections to be arranged iir line to torni an upright ladder or in engin lar relation to form a step ladder, said hinged members including a disc co" d to each ladder section, with said discs a r* ranged in Contact and mounted for inde pendent rotation, each oi the discs bein1 'formed with openings adapted to register when the ladder sections are in position to torm a long` ladder, one of the discs beingformed With an arcuate slot adapted to rcp;- ister vvith one of the openings in the other disc when the sections are in position to form a step ladder, and a pin engagingr the cooperating` openings in the discs to limit the relative movement ot the discs, the cooperation o'f the pin with the opening in one disc and the slot in the other permitting a limited relative movement of the ladder sections When in step ladder relation to provide a range ot angular adjustments of the ladder sections.

ln testimony whereof l aliix my signature.

CHARLES E. KENNETT.

ICO