US838247A - Safety-tread. - Google Patents

Description

CORPORATION OF MAlNE.

MAINE, ASSIGNOR] TO OF BOSTON, MASSALHUSEITS. 'A

SAFETY' EREAD.

Specification of Letters Patent.

Patented Dec. 11 ,---1 9G6.

..'mnlication filed October 19.1905- Serial No. 283.426.

To 11H whom, it may concern:

Be it known that I, Tnnogonn P. FARMER,

of Southwest Harbor, in the county of Hancock and State of Maine, have invented certain new'and useful Improvements in Safetyljreads, of,which the following is a specification. 4

This invention has relation to safety treads, and has for its object to provide certain implrovements therein in consequence of which t eflfrictional or antislippin material maynbe more securely lock d in the sockets in the base-plate.

Referring to the accompanying drawings, Figure 1 represents lan view a portion of a metallic safety-tree. in which the sockets or grooves are partially filled with frictional or antislipping material. Fig. 2 represents a longitudinal section on the line 2 2 of Fig. 1.

3 re resents a section on the line 3 3 of Fig. 1. 1g. 4 represents a perspective view of one end of the tread with one of the walls broken away to illustrate one of the lockington ues.

'I he tread consists of a metallicbase-plate provided with sockets for the reception of the frictional or antislipping material, which may consist of lead or any other equivalent substance. Preferably the sockets are in the form of grooves or channels; but this is not essential, although I consider it preferable.

In the embodiment of the invention illustrated on the drawin s the base-plate a is provided with a plurality of upstanding parallel ribs 5, which form a series of parallel sockets extending longitudinally of the plate.

The plate itself may be hot-rolled-or may be'past, being preferably made of ferruginous material. Each of the channels may be filled with frictional material; but in most cases I find it sufficient to fill the alternating chanf nels or sockets.

For the purpose of securing or looking the frictional material in the. sockets each is provided with one or more tongues, as at 0. Where the plate is made of hot-rolled steel,

thesetongues may be formed by punching Ihave illustrated the ton them from the base; but where the plate is cast these tongues may be cast integrally with the plate.

In the embodiment of the invention which es are punched and died into the form an into the relative and below the lo tongues and securedtherem by said tonguespositions, as illustrated, the tongues all extending in the same direction longitudinally 5 5 of the channels or sockets. Each tongue 1s curved longitudinally and transversefv,"' so that it is she ed somewhat like the bowl of a spoon, with t e convex surface uppermost.

The lead or other antislipping material may be placed in the channels or sockets either when in a molten state (in which case it is to be pouredin) or-maybe ressed thereinto from a sheet or strip. consider it more desirable to draw the leadin sheets or 6 strips from'a reel and to crowd it into the grooves or channels by means of a roller or other suitable presser, so as to'crowol the ma- 'terial underneath the tongues, as shown I find that a safety-tread possessing the features thus described is simple in construction and cheap to manufacture. The anti-- slipping material is securely held and locked against removal, either aocidentalor inten 7'; tional. In the articular embodiment illustrated the antisi ping material fills the aper tures (1, left by t e formation of the tongues, and thus serves to still further insure against the removal of the antislip ing material. .80

Having thus explained t enature of the invention and described a way of constructing and using the same, although withoutatk tempting to set forth all of the: forms in which it may be made or all of the modes of 85' its use, I declare that what I claim is 1. A safety-tread comprising a base-platea havin one or more sockets, said plate being} rovi ed with lockin -ton es extending ongitudinally into sai soc rats and termi 9L nating below the tbp thereof, and antislip'e ping material located in 'said sockets above; itudinal portions hi the;

2. A safety tread comprising a base pla'te w; having a pluralitywofchannels, anday-series of concave-convex" tongues projectin into said channels and-extending lo'ngitu ally thereof and-below the'upper ortread surface, g and antislipping material located in said Icochannels above and below the lon itudinal portions of the tongues and locked therein y said tongues. .4;

3. A safetytread comprising a baselate having a plurality of upstanding walls or'mr05. ing sockets, and a plurality of tongues pro In testimony whereof I have aflixed my signature in presence of two witnesses.

THEODORE FARMER.

jeeting from said plate upwardly and longitu- (finally into said sockets, and :mtislipping; materiellocated in said sockets above and 1 below the longitudinal portions of the tongues and held therein bysaid tongues,sai(l tongues Witnesses: terminating below the upper surfzweiof the 3 JOHN E. WELSH, tread. (J. (J. STEcuER.

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