US2593164A - Pliers for round work - Google Patents

Description

April 15, 1952 H. MCADOO 2,593,164

PLIERS FOR ROUND WORK Filed Nov. 12, 1946 U FH/GZ INVENTOR HAROLD L. M ADOO ATTORNEY Patented Apr. 15, 1952 UNITED STATES PATENT OFFICE Harold L. McAdoo, Bartlesville, Okla. Application November 12, 194.6, Serial No. 709,320

fa Claims. (01. ti-44 Thisiinvention'relates to mechanics tools, and more especially to pliers having, substantially parallel I non-crossed pivoted handles with crossed jaws; an object of the same is to produce a'tool for use by mechanics where an elevating and turning action is desired, and where the turning action causes a multiplying of the gripping powerapplied to said handles.

This invention consists in the novel construction of the plier-handles and integral jaws hereinafter described.

These and other objects and advantages of this invention will be fully set forth in the following description, made in connection with the accompanying drawing in which like reference characters refer to similar parts through the views and in which: I f

Figure I is a view in side elevation. of the improved mechanics tool, embodying the invention Figure IIis a view in front elevation of the tool embodying this invention.

Referring to the drawing, a tool construction is constitutes the second handle which is grasped by the mechanics fingers and is shown solid and has one straightsideand suitably curved inner portions. Member ii hasa terminalorstationary jaw end I5. 'Member I2 which moves with the movement of themechanics fingers has a terminal jaw end M which moves as said handle I2 moves, and it has a recess or cut away portion l5 adjacent the jaw end I 4. The recess. I6 is of sumcient length to permit free play betweenthe long curvedjaw I5 and said portion I6 which moves as handle I2 ismoved. Members '!I and I2 have intermediate sections I! and I8 respectively which are pivotally-connected together-by pintle I3.

The jaw I4 is a short jaw formed at an angle with the straight side of handle I2 and has lateralteeth l9 on its rough" outside operating surface, and said surface is substantially of noncircular'contour. The jaw it has a flat portion 29 adjacent its free end and a smooth curved operating. surface 2I, as shown, forming a concave throat portion, or face, in conjunction with the opposite jaw l4. Theo'per'a ting' surfaces I9 and 20 tend to form a recess Mofsubstantially circular form on the one side, of the smootnjaw thereof when the jaws I4 and I5 are closed. A

. circular object,such as a rod is shown dotted by r '2 numeral 23 and as pressure is applied by jaws I4 and I5 to said object 23, said object 23 has a tendency to roll into the jaws of the tool in a direction toward the pivot I3 as shown dotted by By having the jaws crossed and having the one jaw I5 longer than the opposite jaw I4, and with jaw I5 having a smooth circular form while jaw I4 is:of short non-circular form and has lateral teeth on its operating surface, an elevating or turning actionis accomplished as described above, as any object gripped between the jaws has a tendency to roll into the throat of the two jaws in a direction toward the pivot I 3, this action cannot be accomplished by the ordinary type mechanics tool. Since jaw I4 has lateral teeth on its gripping surface and thejaw I5 has a smooth circular surface, when pressure is applied to an object by said jaws, the object cannot slip upon the lateral teeth of jaw I4 but it can slip against the smooth surface of jaw I5. As the pressure between the jaws is increased, the clamped object slips and turns until it reaches the base of the throat formed by said jaws. The

object grasped is always forced further into, the throat of the two jaws of the pliers or the mechanics tool in a direction of pivot I3 until the object cannot be movedffurther and at this point the action causes a multiplying of the gripping power applied to said handles and the object is tightly held and prevented from slipping within the jaws.

Much difliculty has been experienced in 0bs'et circular nut, or hexagon nut or screw, where space is limited. Often the space is so limited that only the ordinary type pliers or tool can be inserted to grasp the circular nut and no movement of thepliers can be given once the object is grasped. With the ordinary puers with crossed jaws the object is forced out of the jaws when only pressure is applied. .With this novel tool as shown and described, once the object is grasped, the object will be held within the jaws until released-by the operator and if a nut is hard set,

often the application of pressure alone on said nut will cause it to become loosened from the hard set by the turning action taking placewithin the teeth 19 formed on the operating surface of jaw 14 which moves as handle 12 is moved by the mechanics fingers.

From the above description it will be seen that a very simple and very efiicient construction of a tool has been provided in which the one jaw with teeth moves toward the other jaw without teeth which give a turning action in a direction of the pivot as Well as a rigid tight, grip. The movement of the jaws is very accurate, a turning action is provided when pressure is applied on certain objects between the jaws, the turning action continues until the object is moved inward into locking engagement with the jaws,

after which any tendency for a twisting movement which might occur is prevented by the rough surface on the shorter jaw with teeth and locked by the longer jaw without teeth and ofcircular contour. This type tool is easily operated, works with precision, and can be made in small or larger sizes. A novel, neat and efficient tool has been provided.

It will of course, be understood that various changes may be made in the form, details, arrangement and. proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What I claim is:

1. In pliers, the combination of a pair of handles, one of said handles being curved to fit the operators hand and considered the stationary handle, the other handle being substantially straight and considered the movable handle, each of said handles having an intermediate section, said sections pivotally connected together by a pintle, a jaw formed integral with each of said handles, said jaws crossing each other and having adjacent operating surfaces, the jaw on the movable handle forming a short outer jaw with lateral teeth on its operating surface, the jaw on the stationary handle being off-set and longer than the jaw on the movable handle and forming a rear jaw, said rear jaw having a smooth operating surface thereon which is curved to form a concave portion with respect to said outer jaw, the two jaws forming a closed throat portion in conjunction with each other, said throat extending longitudinally and rearwardly thereof, whereby the object to be moved is grasped between the opposite faces of said jaws and upon movement of the handle connected with the outer jaw having teeth thereon an elevating or turning action is effected upon said object, turning the object in a rearwardly direction into the closed end of the throat formed by the jaws, said action being due to the lateral teeth on the outer jaw solely preventing slipping of the object thereon while the smooth surface upon the rear jaw permits slipping of the object thereon when pressure is applied to the handle connected with the outer jaw having teeth thereon.

2. In pliers, the combination of a pair of handles, one of which is substantially straight and considered the lower and movable handle, the other handle being curved to fit the operators hand and considered the upper and stationary handle, each of'said handles having an inter- 4 mediate section, said sections pivotally connected together by a pintle, a jaw formed integral with each of said handles, said jaws crossing each other and having adjacent operating surfaces, the jaw on the lower and movable handle forming a short downwardly turned straight jaw, the jaw on the upper and stationary handle being off-set and longer than the jaw on the movable handle and forming a curved rear jaw, the tertwo jaws forming a closed throat portion in conjunction with each other where they cross, said throat extending longitudinally and rearwardly 7 thereof, whereby the object to be moved is grasped between the opposite faces of said jaws and upon closure of said handles a turning action is effected by the jaws forcing the object in a rearwardly direction into the closed end of the throat formed by the jaws.

3. In a turning tool, the combination. of a "pintle and a pair of members, each member. re-

spectively comprising a straight intermediate portion, a rearwardly extending handle at the rear end of the intermediate portion, and an arm at the forward end of the intermediate portion ter- -minating in an angularly disposed jaw; one of said handles being curved and considered the stationary handle and the other handle substantially straight and considered the movable handle, the jaw formed on the straight handle being rather short, the jaw formed on the curved handle being longer than the jaw on said straight handle and of curved formation, said pintle pivotally connecting the intermediate portions of the members together at a point between the members, said short jaw having teeth on its inner operating surf ace, the longer jaw having a smooth operating surface and curved to form a concave throat portion in conjunction with the shorter jaw at the closed end thereof adjacent where they cross, said throat extends longitudinally and rearwardly thereof, whereby the object to be moved is grasped between the opposite faces of said jaws and upon closure of said handles anelevating or turning action is eifected by the jaws, the teeth on the short jaw preventing slipping of the object upon its operating surface while the smooth jaw permits slipping of the object upon its smooth operating surface in a direction of the pivot.

HAROLD L. MCADOO.

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

UNITED STATES PATENTS Number Name Date 588,991 Henderson Aug. 31, 1897 750,308 Sawyer Jan. 26, 1904 816,278 Tracht Mar. 27, 1906 893,903 Cooper July 21, 1908 969,189 Rademacher Sept. 6, 1910 1,162,141 De Arment Nov. 30, 1915 1,283,217 Kurtzhals Oct. 29, 1918 1,562,083 Evans Nov. 17, 1925 1,935,009 Bluhm Nov. 14, 1933 FOREIGN PATENTS Number Country Date 18,888 Sweden Jan. 28, 1905

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