US892228A - Wrench. - Google Patents

Description

No. 892,228. PATUENTBD JUNE 30, 1908. F. M. DAMON.

WRENCH.

APPLICATION FILED 00T. so, 1907.

W/TNESSES NVENTOH @ML @Sla/W j''a/z/czmoiz BY 'H y .Hill M' ww@ L :ullllllllll' A TTU/NE Y S FRANK MILFORD DAMON, OF SEATTLE, WASHINGTON.

WRENCH.

Application filed October 30, 1907.

To all whom it may conce/m:

Be it known that I, FRANK MILFORD .DA- MON, a citizen of the United States, and a resident of Seattle, in the county of King and State of Washington, have invented a new and Improved Wrench, of which the following is afull, clear, and exact description.

In circular saws of considerable diameter and thickness, it has been found of great advantage to provide insertible and removable teeth, which are 'fitted into spaced openings formed in the peripheral edge of the saw blade, these openings having curved defining edges that are beveled to adapt them for holding the teeth in place. Saw manufacturers provide teeth of various designs, but all have two features in common, comprising 'for each tooth a heel plate and a bit or cutter forming the tooth proper.

For thel insertion and removal of the heel plates and teeth, a wrench is employed that grips the heel plate. The work of placing and removing the heel plates and teeth is quite dangerous, as severe injury to the hands of the operator may result if the wrench slips, or a cross pin used to connect the heel plate with the wrench is broken by applied strain. For safety, the application of force upon the lever should be in a plane coincident with that of the saw blade, so that the lever will be directly over the saw teeth. /Vrenches heretofore employed have the lever disposed at one side of the saw, so that draft strain is not directly over the teeth, and in consequence slips occur or the cross pin breaks and the hands of the operator are endangered.

The purpose of this invention is to provide a wrench of novel construction, which enables the operator to apply force thereupon, directly above the plane of the saw, and thus avoid liability of breaking parts, due to lateral strain.

The invention consists in the nov'el construction of the improved wrench, as is hereinafter fully described, and defined in the appended claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference .indicate corresponding parts in all the views.

Figure 1 is a side view of a portion of a saw blade and of heel plates and teeth fully inserted in spaced peripheral openings therein, the improved wrench being also shown en- Specifcation of Letters Patent.

Patented .Tune 30, 1908.

Serial No. 399,816.

gaged with a heel plate and tooth that are but partly inserted; Fig. 2 is a fragmentary side View of a saw blade and a sectional side View of the improved wrench broken away, the end portion thereof shown being engaged with a heel plate and tooth, and in position to receive rocking movementwherebyto remove said heel plate and tooth 5 Fig. 3 is an enlarged side view of the improved wrench reduced in length, and Fig. 4 is a plan view thereof, seen in direction of arrow r, in Fig. 3.

A brief description of the saw and teeth thereon will be given first, to enable an understanding of the wrench and its advantages.

The saw blade or body A, shown in part, is furnished with similar peripheral openings (L that are equally spaced apart and are curved on their defining edges, and as indicated in Fig. 1, for one opening where a tooth is partly removed, said edges are beveled to give them V-shape in cross section, as shown at a.

The heel plates B are similar in form, each consisting of a flat plate of steel, substantially annular in shape and having such size as adapts it to fit into an opening a, the edges of said plates being channeled for the reception of the V-shaped edges a of the openings (L.

A point or tooth C is shaped on one end to serve as a chisel-like cutter, and at the other end thereof has interlocking engagement. with an adjacent end of the heel plate B, said tooth having the peripheral edge of its body convexly shaped and grooved for enforced engagement with the beveled edge of the opening L when the heel plate and tooth are fully inserted therein.

A perforation is formed in each heel plate B near the end that is interlecked with the body of the tooth O, and to give resilience to this end of the heel plate, which is essential for service of the tooth, a slot b is generally formed therein.' The improved wrench that is provided for forcing the heel plates B and teeth C into the openings e, and for removing the same, is extremely simple and comprises the following details:

A lever 5, of suitable length, and preferably formed of steel, has two spaced jaws 5a formed on one end thereof, said jaws being separated a distance which will permit them to pass loosely over the peripheral edge of the saw body A. The jaws 5a are rounded on their edges, centrally perforated as at c, and curved edgewise in the same direction,

. the saw body will pass freely into the slot as shown in Figs. 1 and 3, thus producing a concave edge portion at d and an opposite convex portion at e, on each jaw.

A slot j is formed longitudinally in the lever body, leaving two similar side walls g, g remaining intact with said body and the jaws 5a, and also with a web 5b, integral with the rear portions of the latter. The web 5b is substantially ovate in cross section, thus providing a rounded surface 7L, adjacent to the convex edges on the jaws 5a, and which a'liords a fulcrum for the lever, as will hereinafter appear. Prior to the use of the wrench, the heel plate B for a tooth, at its end furthest from that which engages the tooth body, is placed in engagement with the beveled curved edge that defines an opening a in the periphery ofthe saw body. This insertion may be effected manually, and should be suflicient to permit the entrance of the tooth body C at its convex edge within the opening a, so that it may be held in interlocled engagement at i with the adjacent end of the heel plate B, this preliminary partial insertion of the heel plate and tooth body appearing centrally on the edge of the segment of the saw, as shown in Fig. 1. The wrench jaws 5a are now caused to embrace the edge portion of the saw body A, and of the upper end portion of the h eel plate B, and the perforations c that are in the centers of said jaws are disposed opposite the perforation in the heel plate, and into'said alined perforations a coupling pin m is inserted.

It will be seen that if the body of the wrench lever 5 is inclined as shown in Fig. l', which illustrates the described arrangement of details, the fulcrum h on the web 5b will rest on the concave edge of the heel plate B, and an adjacent portion of the periphery of defined by the side walls g, g. It will also be noted that the fulcrum point 7L on the web 5b is below the coupling pin m, so that if the lever or wrench handle 5 is pulled in direction of the curved arrow in Fig. 1, the heel plate B and tooth body C will be completely inserted in the opening a, and will be determined when a shoulder non the tooth impinges upon a shoulder on the saw blade, as is clearly shown in Fig. 1.

When a tooth is to be removed, the adjust-` ment of the wrench is similar to that hereinbefore described, it being only necessary to pull on the lever in a direction opposite from that indicated by the arrow in Fig. 1, which will'raise the tooth out of engagement with the saw body and permit its detachment from the heel plate.

It will be seen that by the construction of the wrench, as described, the connection of its jaws will dispose said wrench directly over the saw teeth, and the pull on the lever will exert draft force upon both jaws and at the center of the heel plate, so that there is no lateral strain which would have a tendency to break the coupling pin and thus endanger the hands of the user of the wrench.

Having thus described my invention, I claim as new and desire to secure by Letters Patent,-

1. A wrench -for inserting and removing saw teeth, comprising lever body, jaws at one en d of said body, said jaws having alined perforations therein, and a rounded fulcrum at the rear of the jaws near one edge of said jaws.

2. A wrench for inserting and removing saw teeth, comprising a lever body, two spaced jaws at one end thereof, said body having a longitudinal slot at therear of the jaws, and a web that separates the jaws from the slot and affords a fulcrum for the wrench, the jaws having alined perforations for the reception of a coupling pin.

3. A wrench for inserting and removing saw teeth, comprising a lever body, and spaced jaws on one end of said body, the edges of the jaws being rounded and bent laterally, and said jaws having central alined perforations therein, the lever body being slotted longitudinally at the rear of the jaws, and separated therefrom by a transverse web which is peripherally rounded and provides a fulcrum for the wrench.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.`

FRANK MILFORD DAMON.

Witnesses HARRY J. PLATNER, JAMES K. FRYBERG.

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