US2504922A - Stilt - Google Patents

Description

J. T. DOWELL A ril 18, 1950 STILT Filed May 17, 1948 Patented Apr. 18, i950 UNITED STATES PATENT OFFICE STILT John T. Dowell, Riverside, Ill., assignor to Projects, Inc., Berwyn, 111., a corporation of Illinois Application May 17, 1948, Serial No. 27,482

4 Claims.

This invention relates to stilts for use in pairs by boys and others for the sport of walking with the feet raised from the ground. These devices consist of standards or poles having laterally projecting supports for the feet, and are adopted to be used as props on which the sportster can poise.

Objects of the invention are to provide an improved stilt the foot support of which can be easily adjusted to different elevations and reliably and firmly secured in adjusted position, without liability of being jarred or shaken loose or becoming accidentally unfastened, and to provide such a stilt of a light metal construction having the security and refinements possible in metal work and sufiiciently simple to make its manufacture practicable.

Further objects ancillary or subsidiary to those above stated will be understood from the following description with reference to the accompanying drawings wherein there is shown for illustration a stilt embodying the invention in one practicable form.

Fig. 1 is a front elevation of the illustrative stilt.

Fig. 2 is a side elevation thereof looking toward the inner side of the standard, i. e. the side from which the foot support projects.

Fig. 3 is a sectional view along line AA of Fi 2.

Referring to the drawings, the standard I of the illustrative stilt is of light metal tubing, preferably one inch square aluminum tubing formed with rounded corners and having a wall thickness of one sixteenth of an inch, the tubing being closed at the ends by aluminum caps 2 which are cast for a drive fit in the tubing and need no other fastening. Such a standard is of convenient size for grasping by the hand and, though of fairly light weight, is sufliciently sturdy to withstand the entire weight of a man when imposed on the foot support 3 carried by the standard;

Said support 3 consists of a bracket or member formed as a one-piece casting, preferably of aluminum and preferably in a skeletonized form such as shown. It has a cored out guide portion 4 slidably fitted on and held to the standard, and a laterally projecting portion of T-shaped cross-section forming a relatively wide step or foot-rest 5 and a bracing web 6 thereunder. In the form shown, the guide portion 4 comprises an upper. tension strap 1 by which the bracket is held to the standard and a lower channel-shaped part 8 embracing the standard and cooperating with said tension strap to prevent wobbling of the bracket and to hold it steady or against material relative movement other than longitudinally of the standard.

The load imposed on the foot support is carried by a steel pin 9 slidably fitted in a bore therefor drilled in the lower part of the bracket and transfixing the inner side wall of the tubular standard, there being in said wall a series of suitably spaced and longitudinally aligned holes Ill selectively engageable by said pin. Protraction of said pin through the hole [0 in registration therewith is effected by the expansive force of a helical spring ll compressed between the outer end of said pin and outer closed end of said drilled bore, said spring being loosely fitted in said bore. Limitation of protractive movement of said pin, so that it will only protrude a slight distance into the tubular standard is effected by a cross pin I2 transfixing the locking pin 9 and projecting at opposite sides of the web 6 through openings l3 allowing a limited range of movement of said cross pin. The cross pin also serves as a finger bar by means of which the locking pin can be easily retracted or withdrawn from the hole ID to permit vertical adjustment of the foot support by sliding it on the standard until the locking pin snaps into the desired hole l0.

As the web 6 in the illustrative structure is of no greater thickness than the diameter of the locking pin 9, the portion of the web in which the bore for said pin is drilled is formed with swells or bosses 14. The cross pin could project through longitudinal slots in a continuous swollen portion ofthe web, though in this instance the web is shown formed with spaced swells or bosses, leaving the openings l3 between them.

The pins 9 and I2 may be made of commercially available cold rolled steel rounds, and the only machining operations necessary on the pins is the cutting to lengths and drilling a hole through one which will allow a press fit of the other therein. It is found that a standard drill will make a hole of just the right diameter for a press fit therein of the commercially available cold rolled round steel used for the cross pin l2 and that no reaming is necessary in this connection. And the only machining operation necessary on the bracket or member 3 constituting the foot support is the drilling therein to the right depth the hole or bore for the locking pin. It will be observed that said hole or bore for the locking pin is drilled from the interior side of the wall l5 of the guide portion 4 of said bracket, said guide portion being of such form as to allow the drilling operation and insertion of the spring H and,

locking pin [2 before assembly of the bracket with the standard I.

It will also be observed that the guide portion 4 of the bracket 3 is of a form eliminating unnecessary metal. The upper sleeve part thereof or tension strap 1 is subjected to tension by imposition of load on the footrest 5, drawing the outer wall I6 of said guide portion against the outer side of the standard, while the lower part of the bracket is subjected to compression, forcing the lower part of the wall 15 against the inner side of" the standard. The bracket may be considered as exemplifying a block having a sleeve portion. slidably fitted on the standardv and a laterally" projecting foot rest, said sleeve portion having 'a' cut out portion to eliminate functionless or unnecessary metal as well as to permitdrilling-the bore for and inserting the locking pin.

The invention reduces the labor cost ofmanu facture to a small fraction of the cost of the material utilized, which makes it practical to put a" high quality item of this character on the market. Stilts embodying the invention in the form shown and describeda're of slender construction and'light weigh, but adequately strong and rigid for their purpose, and conveniently adjustable but free from the danger of accidental unfastening or loosening and displacement of the foot supports. I

The illustrative'structur e may be modified in form and'details within the scope of the appended claims. The term aluminum is intended to include aluminum alloyed with other metals, and the invention is not intended to be limited to a' construction either entirely or partly of aluminum.

I claim: 7 1. An adjustable stilt comprising a tubular standard, a member consisting of a one-piece" bore drilled into said web from the inner side of a wall of said guide portion below' said sleeve, said bore being closed at its outer end, there'being in the inner side of the standard vertically spaced holes selectively registrable with said bore, a loadsustaining pin slidablyfitted'in said bore, a helical spring compressed between'the outerend ofsa'id pin and outer closed end of said bore,whereby' said pin is protracted into the hole ofthe standard in registry therewith, and a lateral projection on said pin limiting protract'ive movement thereof and afiording means by which to retract it, there being an opening in the wall of said bore through which said projection extends, said opening being proportioned to allow necessary move ments of said pin.-

2. An adjustable stilt comprising a tubular standard, a member consisting of a one-piece" casting having a guide portion slidably fitted on the standard and a laterally projecting portion of T-shaped cross-section forming a relatively wide foot-rest and a bracing web thereunder, said guide portion comprising an upper sleeve and a lower channel-shaped-part extending from said sleeve, a bore drilled into said webfrom the inner side of the adjacent wall of s'aid channelshaped part, there being in the inner side of said standard vertically shaped holes selectively registrable with said bore, a load-sustaining pin slidably fitted in said bore and spring-urged to protrude into the hole in registry therewith, and

a cross-pin transfixing said load sustaining pin and projecting through opposite openings in the walls of said bore so proportioned that said crosspin limits protractive movement of said loadsu'staining pin and affords means by which-to retract it.

3. A stilt comprising a standard having a plurality of longitudinally spaced holes, a skeletoni'zed block consisting of a one-piece metal casting having a cored out portion slidably fitting on said standard and a laterally projecting portion to provide a" foot-rest; said block having an upper tensionstrap by which it is held to the standard and' alower' compression part which by impositionof load on said foot-rest is pressed against the'standard, and a retractible spring-actuated pin slidably mounted in said compression part and with which said-holes are selectively engageable for supporting'said blockat'difierent eleva tions' on the standard and locking it thereto, said' block havinga thin bracing web joining the foot-rest to the portion of the b-lolck which slidablyfits the standard, said web having a bored swollen portion containing said locking pin, said swollen portion having opposite openings" and said. locking pin having a cross-pin inserted therethrough and projectingthrough said open ings, the openings being of appropriate proportions to allow retraction of said locking pin by said cross-pin and to limit protractive movement v of said locking pinby' abuttment' of said crosspin against endwalls of said openings.

4. An adjustable stilt comprising a tubular of, said web,v said standard having vertically spaced holes selectively registerable. with said bore, said web'having, spaced swollen portions in which said bore is drilled, said bore being of a diameter substantially as great as" the thickness of said web except the swollen" portions thereof,

a lo'ad-sustaining-pin slidably fitted in said bore and spring-urged to. protrude into the hole in registry therewith, and a cross-pin transfixing saunas-sustaining pin andp'rojectin'g' between said: swollen portions of the web,, said cross-pin 6 0" limitingprotractive movement of said load-sustaining pin and aifording means by" which to retract it. y r I H V JOHN'T'.'DOWELL.

REFERENCES" CITED 'li he following: references are of record in the file oi this patent:

UNITED STATES PATENTS Number Name Date 1,059,856 Fox-f Apr. 22, 1913 11,703,030; Peterson Apr; 9, 1929 2,228,592 Curtis Jan; 14; 1941 Certificate of Correction Patent No. 2,504,922 April 18, 1950 JOHN T. DOWELL It is hereby certified that error appears in the printed specification of thefsibo ve numbered patent requiring correction as follows:

Column 3, line 73, for the word shaped reed spaced;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice;

Signed and sealed this 11th day of July, A. D. 1950.

THOMAS F. MURPHY,

Assistant Gonunz'ssioner of Patents.

Images