US2940346A - Joint and plier construction - Google Patents

Description

June 14, 1960 M. SCHIFFBAUER JOINT AND PLIER CONSTRUCTION Filed Aug. 19, 1957 FIG.I

FIG. 4

FIG. 3

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United States Patent JOINT AND PLIER CONSTRUCTION Max Schilfbauer, 60 Warner Ave, Springfield, NJ. 7 Filed Aug. 19, 1957, Ser. No. 679,047

2 Claims. c1. 81-416) This invention relates to pliers, nippers and like instruments having two halves pivotally connected together and adapted to be operated by manipulation of their handles, of the type disclosed in my Patent No. 2,611,288 upon which the present invention is an improvement.

It is an object of this invention to improve the quality of plier performance by providing for and adapting to the mesh joint construction a mesh plate of circular shape and suitable toughness which by means of its shape and mechanics results, (a) in constant uninterrupted contact of all meshing or guiding surfaces involved to their maximum capacity which in turn produces maximum support for the performing operation of the pliers; (b) a meshplate that is designed to rotate or float and has only in this condition the largest possible wearing surface comprising the full circle of three hundred sixty degrees but may upon demand easily be transformed into a stato receive each other, will produce acceptable stable joints and tools with substantial savings.

It is a further object of this invention to provide for pliers, nippers and similar instruments produced from bar stock or wire, wherever it is required, ring or how handles or grips of suitable material in a substantial and economic fashion.

It is still another object of this invention to efiect further savings in preparing the components of the pliers and simplify the assembling of mesh joints by omitting accurately matched shapes an machined press fits to facilitate the fastening of the mesh plate as well as its selective positioning into the assembly; neither does the joint require assembling under red heat, avoiding resulting distortions and their correction.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawings, in which Fi l is a plan view of a pair of pliers according to the preferred embodiment of the present invention, shown in opened position;

Fig. 2 is a plan view of one component plier half of a modified form of pliers;

Fig. 3 is a plan view of said modified pair of pliers in closed position; and

Fig. 4 is a side elevational view of a pair of pliers according to Fig. 3.

Similar numerals refer to similar parts throughout all the views.

Referring now more particular to the drawings, and 11 designate complementary plier halves perforated ICC and adapted to be pivotally connected together. The parts 10 and 11 being substantially identical, have a jaw portion 12 and a handle portidn 13 integral therewith and made from a single piece each. They have a flat bearing surface or portion 14, and an opening or perforation 17 extends through the center of this bearing portion 14. V p

Thebearing surface 14 is being extended, diametrically opposite, by undercuts 15 into the jawportiofn 12 and'16 into the handle portion 13. 'These undercuts 15 and 16 are of such width as to receive with a slide fit the round I guide or mesh plate 18, and of such depth as to allow rotating or floating of the mesh plate 18, and are finished at such angle as to permit the insertion and location of the mesh plate 18. If, however, the demand is for a stationary mesh plate, then the mesh plate 18, after first insertion and location into the joint assembly, may be fastened or pinched by compressing the undercuts 15 and 16 of only one of the two plier halves 10 or 11.

The mesh plate 18 is of circular shape and perforated in the center to register with the pivot rivet 19. This perforation is so dimensioned as to provide a running fit permitting, if so elected, the rotation or floating of the mesh plate 18 in the joint assembly. The mesh plate 18 is inserted, without requiring specific predetermined positioning except registering its perforation with the holes 17 in the two component halves 10 and 11, into the undercuts 15 and 16 of the joint assembly and held in position by the insertion of the pivot rivet 19 into the assembly.

After the assembly is thus completed, portions of the mesh plate 18 will reach with a slide fit into the undercuts 15 and 16, effecting thereby the harnessing of the opening and closing movements of the two plier halves 10 and 11 to the same plane, resulting in stabilization for these movements and rigidness for the jaw portion 12 under working stresses. The circular shape of the mesh plate 18 will engage the undercuts 15 and 16 uninterruptedly in their entire length throughout the entire performance of the pliers as may be gathered by comparing the relative positions of mesh plate 18 and undercuts 15 and 16 in Figs. 1 and 3; by comparing these specific de tails it will also become obvious that the circular mesh plate 18 by nature of its shape cannot but transmit these stabilizing qualities to the full extent of its diameter which coincides with the capacity for the joint; it will also have in its rotating or floating form wearing surfaces, being in mesh with the undercuts 15 and 16, comprising its entire three hundred sixty degrees.

With the movements of the plier halves 10 and 11 stabilized or guided throughout, the joint portion of these halves 10 and 11 consisting of portion 14 Fig. 2, with its adjoining areas, may be narrowed down from the width typical for the conventional forgings to permit the use of bar or wire stock suitably dimensioned, unforged, but bent and machined to receive each other, the modified Z form in Fig. 2, giving one example, with the joint still providing satisfactory rigidness for pliers, nippers and like instruments.

The ring or how handle 20, Fig. 3, is fabricated sep arately and fastened by a suitable method at points 21 and 22, Fig. 3, to the operating half 10 and 11.

I claim:

1. In a plier or similar to'ol comprising complementary parts, each of said parts having jaw and handle portions, said jaw and handle portions of each part having like reentrant recesses arranged diagonally opposite each other, a mesh plate having an edge portion adapted to cooperate with the respective reentrant recesses of the parts, and a pivot pin connecting the complementary parts and the guide plate together, the improvement which comprises said edge portion having a curvilinear Batented'Juhe 14, 1960 "43,940,346 Y a. a

' periphery'contir uous fqr angular extent-greater than ous for substantially 3609'about the center-ef'the pivot the maximum operiinglof'the' jaws, and-said mesh plate pin as a vertex, and saic 1 mesh plate has a clearance in has a clearance 'in" said recesses-with respect to both Of a said recesses with respect'to botli of said Complementary said complementary partsah ut said pivot pin as a center parts about said pivot pin as a center of rotation to form qf ridtatign tofcrmafloatingrmml fir ga r r v 5 a floatingmounting. r

111 1a, plierj 131" similar 001 cqinfirisirig complementary parts; each of said parts; having jaw'iami handle portions, 7 References Cited in the file of this patent a me h pl t having n ed p o pt to pe 10 672,673; [Hobbs et' al. 7.

said ja'vifland handle portions of each .part having like reentrantjirecessesarranged diagonally oppositeeach other; UNITED STATES-:PATENTS ate with the respective reentran t recesses of the parts, and 2,027,735 'R h Ian, 14, 1936 a pivot 11in connecting'the; complementary parts. and' the 2,088,224' 'Aiken; July 27, 1937 7 ui e P t to e r t mp mc which comprises 9 2,611,288 Schilfballfi Sept. 23, 1952 V a fidg p ii having a curvilinear periphery contim 2,704,399 Melcher Mar. .22, 1955

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