US2757693A

US2757693A - Tool for twisting fence wire securing staples

Info

Publication number: US2757693A
Application number: US381444A
Authority: US
Inventors: Moffett Harry
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-09-21
Filing date: 1953-09-21
Publication date: 1956-08-07
Anticipated expiration: 1973-08-07

Description

H. MOFFETT Aug. 7, 1956 Filed Sept. 2;, 1955 \w MN 4 x w 9 m i m Q m m T R/ E f T V 1.2 75%;; m v r] A N 0 km II. M Ii l .9 figgg aa 7 Z m HY B ww NM w 2 1 7/ W v k & mm

United States Patefit O 75: .i n 7;.1' v

v STAPL 4 HarryMoifett, Fresno, Calif.

7 Application September 21, .1953, Serial No. 381,444 1 Clainn (Cl. 140-57 Tool. FQRJTWISTING WIRE SECUMNG shank-supported jaws onto the projecting legs of a fence wire securing staple preparatory to twisting said legs together by manipulation of a hand crank which forms P of the Q9 for additional object of the invention is to provide a tool,' as i n the preceding paragraph, wherein the, shank retracting mechanism is simple in structure, positive-in action, quick operating, and self-locking-to .hold. the jaws closed during a staple twisting operation-abut easily e a ble- A further object of the invention is to provide a tool, as above, in which the shank retracting mechanism includes a novel swing lever actuated rotary crank pin assembly operative to retract the shank and close the jaws upon swinging of the lever to a predetermined stop position; the crank pin assembly then being in an overdead center position in a direction to hold the shank retracted and the jaws closed.

It is also an object of the invention to provide a tool, for twisting fence wire securing staples, which is designed for ease and economy of manufacture.

Still another object of the invention is to provide a practical and reliable tool for twisting fence wire securing staples, and one which will be exceedingly effective for the purpose for which it is designed.

The objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings:

Fig. 1 is a side elevation of the tool as in use; the shank retracting mechanism being in its releasably locked jaw closing position.

Fig. 2 is a fragmentary longitudinal sectional elevation, with the shank retracting mechanism released; the shank being in its advanced position and the jaws open.

Fig. 3 is a fragmentary plan view, partly in section, taken on line 33 of Fig. 1.

Referring now more particularly to the drawings and to the characters of reference marked thereon, the tool comprises a cylindrical hand grip block 1 which is somewhat elongated, while a substantially longer barrel 2 is slidably disposed in the block 1, projecting therefrom at both ends.

At the rear end the barrel 2 is fitted with a hand crank, indicated generally at 3, which includes a radial or crank arm 4 having a hub 5 on the inner end threadingly secured to the adjacent end of the barrel 2. At the outer end the crank arm 4 is fitted with a handle 6.

prevented by a cross pin 11 which projects through the 2 A 'shank 7 is slidable in the elongated barrel 2 and said shank, from the forward end rearwardly a substantial distancais longitudinally split, as at 8, with cooperating.

jawsj9 formed on the split ends. I

The jaws 9 are rearwardly and inwardly tapered, as at 10, with the jaw taper having matching engagement with a corresponding taper in the forward end pr throat of the barrel 2. With this arrangement retraction of the slidable shank 7 from an initially'advanced position, as

in Fig. 2, causes the jaws 9 to close, as in Fig. 1..

Rotation of the slidable shank 7 in the barrel 2 is longitudinal split 8 between opposite sides of said barrel. The cylindrical block 1 is fixed in connection, at the top thereof, with a pair of forwardly projecting, transversely spaced bars 12having a down-turnedhook structure 13 on the forward ends thereof; such hook structure cooperatively engaging with a toolsupporting and locating guide block 14 vertically adjustably secured to an upright or post 15 supported from the ground and adjacent the fence by, a pedestal (not shown).

The tool supporting and locating guide block 14 includes a cradle 16 which receives a horizontal fence wire 17, while a shelf, 18 which projects from the post 15 at a lower point supports the lower end of a vertical stay wire 19 which intersects, the horizontal fencewire 17.

Within the,t'ool supporting .and locating guide block 14 the wires 17 and 19 are connected together by an initially parallel leg staple, indicated generally at 20; the legs of such staple projecting toward and being clamped. between the jaws 9, when the shank 7 is retracted by the mechanism hereinafter described. Subsequent manual rotation of the barrel 2 by the crank 3 twists the staple legs together, in the manner shown in Fig. l, and effec' tively cinches the staple about the wires "17 and 19 to secure them together.

The foregoing general assembly of the tool is substantially the same as shown in the issued patent hereinbefore identified; such patent, however, having embodied a different and more difficult to operate shank retracting mechanism than that here shown generally at 21, and which latter mechanism comprises the essence of the instant invention.

The shank retracting mechanism 21 is constituted of a pair of transversely spaced ears 22 which project rearwardly from the crank hub 5 on the barrel 2, and a relatively short crank pin 23 is journaled in connection with and extends between the ears 22. The crank pin 23 includes a central eccentric or crank portion 24, the ends of which are spaced from the ears 22.

The slidable shank 7 is formed, at its rear end, with a rearwardly projecting, fiat attachment eye 25 which projects out of the hub 5, and in which eye the eccentric or crank portion 24 is journaled.

The numeral 26 indicates a lever arm which is forked at its inner end to define flat fork eyes 27 which surround the crank pin 23 between corresponding ends of the eccentric or crank portion 24 and the cars 22; said fork eyes 27 being fixed to the crank pin 23 by radial keys 28.

The ears 22 are disposed so that the lever arm 26 in one to the position of Fig. l with said arm abutting flush against the crank arm 4, the eccentric or crank portion 24 turns to the rear, retracting the shank 7 and jaws 9,

Patented Aug. 7,

resulting in closing of the latter. As the eccentric or crank portion 24 reaches its rearmost position it is slightly beyond dead-center, which-under the influence of the tension on shank 7-tends to self-lock the lever arm 26 against the crank arm 4.

The fork eyes 27 are formed so that their axes are offset rearwardly from the major longitudinal plane of the lever arm 26 when the latter lies in abutment with the crank arm 4.

By the simple expedient of manually swinging the lever arm 26 from its released position, as in Fig. 2, to its locked or holding position, as in Fig. l, the shank 7 and jaws 9 are retracted under tension; such jaws closing on the initially parallel legs of the staple 20, and being held so closed by the beyond-dead-center disposition of the eccentrie or crank portion 24, holding the lever arm 26 in said locked position and wherein it is out of the Way.

With the jaws 9 thus effectively clamped on the legs of the staple 20, the barrel 2, together with the shank 7, is rotated by the hand crank 3, effectively twisting the legs of the staple together, in the manner shown in Fig. l, and which staple thereafter maintains the wires 17 and 19 secured together.

For a more specific disclosure of the exact form and operation of the hook structure 13 and the tool supporting and locating guide block 14, reference is made to the hereinbefore identified issued patent.

The present invention, in the novel shank retracting mechanism 21, provides an advantageous structure and one which greatly facilitates the attachment to, and operation of the tool in connection with, a staple to be twisted.

From the foregoing description it will be readily seen that there has been produced such a device as will substantially fulfill the objects of the invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:

A gripping and twisting tool including a hand crank secured on the rear end thereof, a shank slidable in the barrel, a jaw assembly on the shank at the front end of the barrel, cooperating elements on the barrel and jaw assembly to close the latter upon retraction of the shank rearwarttly in said barrel, manually actuated mechanism for so retracting the shank comprising a crank pin disposed transversely at the rear of the barrel, transversely spaced ears in which the crank pin is journaled on opposite sides of the crank thereof, said ears being mounted in fixed connection with the barrel, an eye on the rear end of the shank and in which the crank of the pin is turnably journaled, a lever arm forked at one end, the forks being formed as eyes and the pin beyond the crank thereof projecting through said fork eyes, and means securing said fork eyes to the pin; swinging of the lever arm from one position to another rotating the pin in a direction and to an extent to dispose the crank of said pin in a position to so retract the shank; and the lever arm when in said other position lying substantially radially of the barrel and in engagement with the radial crank arm included in the hand crank.

References Cited in the file of this patent UNITED STATES PATENTS 1,795,625 Van Slyke Mar. 10, 1931 1,903,830 Moffett Apr. 18, 1933 1,970,924 Van Slyke Aug. 21, 1934 2,048,460 Moffett July 21, 1936 2,214,267 Bednarck Sept. 10, 1940 2,297,174 Tabb Sept. 29, 1942