US864194A - Extension-ladder. - Google Patents

Description

PATENTED AUG. 27, 1907. I

No. 864,194 i L. P. REIMANN.

EXTENSION LADDER. APPLICATION FILED MAY 11, 1907.

2 SHEETSSHEET1.

Y 21 it PATENTED AUG. 27, 1907..

L. P. REIMANNV EXTENSION LADDER. Arrmonxou FILED MAY 11, 190?.

. UNITED srs r ss A PATENT oFFic LOUIS P. 'RE'IMANN; OF BUFFALO, NEW YORK.

.EZTENSION-LADDEE Specification of-Letters resent.

Patented Aug. 21, 1907. I

Application filed May 11,1907. Serial'No. 373,191.

To all whom it may concern.-

Be it known that I,- Lorne P. REMANN, a citizen of the United States, and a resident of Buffalo, in the .county'oi Erie and State of New York, have invented certain new and useful Improvements in Extension- Ladders, of which the following is a' specification.

My invention relates to improvements in extension ladders, and more particularly to extension-ladder" hooks whereby the slidable section of the ladder is section engaging a rung on the stationary section.

retained in an extended position with reference to the stationary section thereof. V r

The objects of'this invention are, the production of a simple, durable and inexpensive ladder-hook which will positiyely engage any desired rung of the stationary section and retain the slidable section of the ladder in extended position to'any degree desired; to provide ,improved'means for maintaining the outer end of the rider or dog in contact with the free end of i the suspension hoolr; to provide improved means ;for

maintaining thefree end of the suspension-hook in linewith the rungs of the stationary section of the ladder; and to otherwise improve on extension-ladder hooks so that the several parts may actfreely, and whereby a durable ladder is produced which can be conveniently and easily adjustedv to any height within certain limits. I

Theinvention consists in the construction, arrange- 'ment, and combination of parts to be hereinafter described and particularly pointed out in the appended claims. v V

In the accompanying drawings, in which, similar numerals of reference refer to similar parts,-Figure 1 is a front elevation of partsof the ladder sections and the ladder-hooks on the slidable section. Fig. 2 is an enlarged longitudinal section through one of the ladder-hooks and the rail to which it is secured. Fig. 3 is .i perspective View of'a portion of each ladder section and one of the ladder-hooks on the slidable Fig. 4 is a vertical section through the retainer-housing and the lower end of the suspension-hook, showing the lattcr engaging the end of the expansion-spring. 5 is a transverse vertical section on line av' s,

Fig. 4. Fig. (5 is a transverse section taken on line y-y, Fig. 8. Fig. 7 is a vertical section through the upper portion of the retainer-housing and the rail to which it is secured, showing the manner of detachably connecting the cover to the back-plate thereof. Fig.

8 is a vertical transverse section through the suspension-hook taken on line zz, Fig.6. Fig. 9 is a detaehed perspective view of the suspension-hook. Fig:

'10 is a lace view of the lower end of the hook, show ing the face opposite that shown in Fig. 9. Fig. 11

is a detached perspective view of the rider or dog. Fig. 12 is a detached perspective view of the back plate of the housing.

The ladder comprises two sections, one being the stationary or lower section 1, and the other the slid able or upper section Zadaptcd in be elevated on the stationary section for adjusting the ladder to any manner. Secured to the side-rails of the slidable sections are m'etallic retainer-housings 3 in which the lower ends of ladder hooks 4 are pivot-ally secured.

.60 height desired within 'certainlimits, The 'sections' i may be held together in any ordinary or approved Each of said housings comprise two parts,one a back-plate 5 secured to the inner face oE-a' side rail,

and the other a cover 6. Each back plate has a circular flange- 7 cast integrally therewith, a stud 8 whose axis is coincident with that of said flange and whose outer end extends beyond'the edge of the latter, and a. web 9.connecting the stud with said fiangeand serving as an abutment, as will presently appear. In this manner, a'parti-circular or segmentalpocket 10 is formed between said stud'and flange, in which is located a spiral spring 11 abutting with one end against the said abutment.

The cover of the retainer-housing comprises a front wall 12 and side walls 13 whichbear with their inner ed ges against the back-plate, and a tail-piece 14 in a plane beyond the inneredges of the side walls; so that when the cover is applied, the said tail-piece bears, against the inner ride of the rail to which the housing is applied. Said tail-pieceis thereiorein'line with the back-plate and has a screw-hole 15 through which is passed a screw that enters the side rail and securely fastens the lower end of the cover.

trude from the inner edges of the side-walls thereof at their upper ends, and said hooks are passed through apertures 17 in the back plate and enter sockets 18in the side rail formed by gouging out the latter in rear The upper end of each cover is secured by mcansof hooks 16 that pro-' The suspension-hooks are designated by the numeral 20, each having an aperture 21 at its inner end into which fits the stud of the cooperating back-plate and 9. lug 22 on its inner side which enters the'segmen tal pocket in said back plate, between which lug and the abutment 8, the spiral spring 11 is interposed. By means of these springs, the outer or upper ends of the suspension-hooks are maintained in a position to contact with the rungs. of the stationary section of the ladder when the slidable section is being elevated, and

the inner edges of said hooks strike against the upper ends of the inner side walls, as shown at 23, Fig. 3. In this manner, the extent to which the hooks are forced inward by the springs 11 is limited. Each suspension hook comprises a shank .24, a hook portion 25 opening downward, and a cam-face 26 inclined upwardly and forwardly from the outer end of said hookportion. By reason of the shank 24 of the hooks bearing' against the inner side walls of the housings, the camfaces are positioned to engage the rungs oi the stationary section of the ladder when the slidable section is being elevated and thus cause forward deflection of the hooks against the actions of the springs 11.

La I11 order that the slidable section of the ladder may be lowered without the suspension-hooks thereon 'en gaging the rungs of the stationary section, each hook' has a rider or dog 27 pivotally attached thereto between its hook-portion and its pivotal point, as at 28. -The outer or free ends of these riders or dogs extend up-' Ward beyond the lower ends of the cam faces on the hooks, so that when the slidable section of the ladder is being elevated, they are engaged by the rungs of the stationary section to permit the hooks to be engaged with any desired rung of the last named section, in a manner common to ladders of this type; and upon lowering the slidable section on thestationary section, the outer curved edges 29 of said. riders or dogs serve to deflect the hooks so as to pass over the rungs without engaging them. 1

At the points of connection ofthe riders or dogs with the shanks of the suspension-hooks, I increase the thickness of the shanks, and in each form a part i-c'ir-" cular or-segmental pocket or depression 30, a boss 31 arranged centrally in said pocket or depression and connected with the outer defining walls of the pocket or depression by a web 32 which serves as an abutment for one end of a spiral spring 33 situated in said pocket and having its other end engaged by a lug 34 extending into said pocket from the inner side of the cooperating rider or dog. The springsin the depressions of both hooks act against thetlugs34 of the dogs to hold the outer free ends of the latter in contact with the ends of the hook-portions of the suspension-hooks, and upon the said dogs being depressed when the ends thereof engage a rung of the stationary ladder, said springs yield and recover themselves as soon as the dogs clear said rung, thereby forcing the ends of the' dogs in contact with the hooks to be engaged by the next rung. V "l The operation of ladders of this type is apparent to tionary section and a'slidable section, of meaps for supporting said slidable section in an extended position on 'the stationary section comprising suspension-hooks, and.

retainer-housings in which said hooks are pivotally secured, said housings consisting of apertured plates secured to the rails of the slidable section, covers having each a hook at one end which extend through the aperture of the cooperating plate and engage behindthe latter, and means for securing the opposite ends of the covers to said rails.

2. A. device of the kind.described comprising a plate adapted to be secured to a rail'of a ladder and having a segmental pocket, a stud arranged axially with reference tdsaid pocket, :1 suspension-hook.-piv0tally held on said stud 31nd having :1 lug extending into said pocket, and a spiral springlwithin said pocket betweenone end thereof and the lug on said hook v i 3. A device of the kind describedcomprising a housing consisting of a plate adapted to be securedto a .rail of a ladder and having a stud projecting therefrom and an abutment adjacent said stud, and a cover having an opening to receive the end of said stud, a suspension-hook pivotnlly held to said cover and having its free end projecting from said housingfsaid hook having also a lug in a plane with the abutment on said plate, and a spiral theaxis or said pocket and :1 lug thereonfextendingflnto said pocket, and aspiral springwithin' .s'iiid pocket abuts ting with opposite ends againstfone end of'said pocket and the said lug, respectively.

5; A device of the kind described comprising a plate adapted to be.secured to a-rail ofladderand having a circular flange, a stud surrounded by .jsaid flange and extending'beyond the edge of thelattei, a weh c'onneoting said stud andsfiange, a cover havingan opening'receiving the end of saidstud, a suspension hookyonsaid stud between said cover and the edge ot; said fiange'nnd havinga lug extending into'th'e spacebetween said flange and stud, and a spiral spring insaid space between said lug and the said web. i In testimony whereof, I have atflxed my signature the presence of twpsubscribing witnesses.

' 4 LOUIS P. REIMANN.

Witnesses: i Z

EMrnNnunAn'r, ELLA C. 'Pnsscknanu.

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