US2628521A

US2628521A - Plier-wrench

Info

Publication number: US2628521A
Application number: US147238A
Authority: US
Inventors: Berglund Nels; Berglund August
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-03-02
Filing date: 1950-03-02
Publication date: 1953-02-17
Anticipated expiration: 1970-02-17

Description

Feb. 17, 1953 N. BERGLUND ETAL PLIER-WRENCH Filed March 2, 1950 INVENTORS: NELS BERGLU ND AUGUST BERGLUND Patented Feb. 17, 1953 Nels Berglund uluth and August Berglund,

Minn.

Application March 2, 1950, Serial No. 147,238

3 Claims.

This invention relates to wrenches and has special reference to wrenches of the plier type.

One of the principal objects of the instant invention is to provide a wrench which gives a firm positive grip on a workpiece without the need for excessive hand pressure.

Another object is to provide such a wrench of the plier type which is adjustable so that a wide size range of workpieces may be handled emciently with the'wrench. 1

Another object is to provide such a wrench with as few parts as possible, and one which can be manufactured and sold inexpensively.

A further object is to provide an adjustable plier wrench wherein the working faces Of the jaws remain substantially parallel irrespective of the spaced relationship of the jaws.

A further object is to provide an off-center locking arrangement whereby, once a grip is obtained on a workpiece, it will not be necessary to apply excessive pressure to maintain the grip on the workpiece.

These and other objects and advantages will become more apparent as the description of the invention proceeds.

In the accompanying drawing forming a part of this application:

Fig. 1 is a side elevational view of an adjustable plier-wrenc-h embodying the invention.

Fig. 2 is an edge view of the device shown in Fig. 1.

Fig. 3 is a side elevational view of the opposite side of the device shown in Fig. 1.

In the drawing the reference numeral I indicates the fixed jaw of the wrench or plier, and 2 indicates the working face thereof which may be provided with teeth as shown for gripping a workpiece. The numeral 3 indicates the stationary handle portion of the wrench which is preferably integral with the jaw I, being joined thereto by means of the fulcrum portion 4. The handle 3 is hollow, as at 5, to reciprocably receive an adlusting screw 6. The rear end of the handle 3 is flattened or spread slightly as at 1 to permit an opening 8 to be formed therethrough, an adjusting nut 9 being carried in the opening, and being threaded on the screw 6 so that the latter may be reciprocated in the hollow handle 3 by rotating the nut 9 in one direction or the other.

An elongated slot II) is provided in the fulcrum portion 4 of the stationary member of the wrench. the slot preferably being disposed at an obtuse angle to the working face of the fixed jaw I.

A movable jaw II is provided, having a working face I2 which is normally substantially parallel with the working face 2 of the jaw I when the wrench is in operation. The movable jaw has an integral fulcrum portion I3 and handle I4, an opening (not shown) being provided through the fulcrum portion, whereby a rivet I! may be installed through the latter said opening and the slot ID to secure the movable and fixed parts of the plier or wrench together in slidable, pivotal relationship.

The fulcrum portions 4 and I3 are of reduced thickness to that of their respective jaws I and I I, the jaws extending laterally on opposite sides of their respective fulcrum portions so that the working faces of the jaws will meet in alined relationship, as shown.

To complete the wrench, a link arm I5 is provided between the adjusting screw 6 and the movable member of the wrench. The link arm is pivotally secured to the inner end of the screw 6 as by a rivet It. The opposite end of the arm I5 has a substantially cylindrical enlargement or head I1 thereon which is carried in a similarly shaped opening or indenture I8 formed in the 'edge of the fulcrum portion I3 directly opposite the screw 6, as shown, the fulcrum portion being slightly extended or enlarged for the purpose, thus, the arm I5 is pivotally carried by the screw 6 and by the fulcrum portion I3 of the movable member of the wrench.

It will readily be seen, from the above. that the spacing of the working faces 2 and I2 from each other may readily be adjusted by rotating the nut 9 to reciprocate the screw 6. The link arm I 5 will move the movable member I II3--I4 when the screw 6 is reciprocated, the rivet 0 sliding freely in the slot IIl, obviously, to change the relationship of the working faces. When the spacing of the jaws is changed, their substantially parallel relationship is not effected until the handle I4 is moved away from the handle 3 as shown in dotted lines in Fig. 1. This moves the jaw II away from the jaw I enough so that they may be engaged on a workpiece.

When the jaws are in this open position, it is to be noted that the end I1 of the link arm is carried with the fulcrum portion I3, it being pivotally carried in the socket I8, and is on the outside of a line rumiing from the pin or rivet I6 to the pin or rivet 0. However, when the handle I4 is moved to its normal gripping position as shown in full lines, Fig. 1, the end I! of the arm is on the opposite side of the said line between the rivets I6 and 0. This feature puts the link arm in an off center relationship with the jaw fulcrum I] which looks the jaws on the workpiece and prevents the transmission of opening stresses from the jaws through to the handles. This eliminates the need for applying an excessively strong hand grip to keep the handles 3 and M from spreading and releasing the workpiece from the jaws. The jaws are easily opened when desired, however, by manually moving the handles 3 and I4 apart.

In adjusting. the plier-wrench to. a particular workpiece, the adjustment should be made so that the head I! of the link arm moves into its desired ofi-set relationship to the jaw fulcrum rivet 0 to provide the desired locking feature and eliminate the need for excessive gripping stress on the handles as is the case with ordinarypliers.

A stop 19 is provided on the fulcrum portion I3- adjacent the socket 18 to engage the-link arm 15:,

as shown in dotted lines at 20, to limit the disltance the handles 3 and M may be spread apart. With the instant plier-wrench leverage and workpiece grip is provided without the need for excessive strength on the part of the. operator. Having thus described our invention, what we claim is z I. In a plier-wrench a pair of one-piece mem bar's, each of'said members having a rigid jawspread said handles apart.

3. The structure as set forth in claim 1 and a stop adjacent said socket to limit the distance said handles may be spaced apart.

NELS BERGLUND. AUGUST BERGLUND.

REFERENCES CITED The following, references are of record in the file of this patent:

UNITED. STATES PATENTS Number. Name Date 449,627 McNair Mar. 31,1891 1,280,405 Collison et a1. Oct. 1, 1918 2,206,251. Fischer July: 2, 1940 2,471,734 Fischer May 31, 1949 2,481,435 Meunier Sept. 6, 1949 2,496,308 Pugh et a1; Feb. 7, 1950 2,498,235 Barber Feb. 21, 1950 2,519,630 Boyer Aug. 22, 1950