US 2404580 A
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Description (OCR text may contain errors)
July 23, 1946. z', c. VAN SCHWQARTIZ 2,404,530
TOOL Filed July 29, 1945 v low! 6. VANSCHWARTZ Patented July 23, 1946 TOOL Zolly C. vanschwartz, Akron, Ohio, assignor to The Firestone Tire& Rubber Company, Akron, Ohio, a corporation of Ohio Application July 29, 1943, Serial No. 496,673
'1 nns-invention relatesto tools,;and more especially it relates to tools having inherent flexibility to enable use thereof in places that are difficult of access. 1
The tool is of primary utility in operative association with percussive apparatus such as the pneumatic hammer, in which association it is adapted for a number of uses. For the purpose of illustration, but not limitation, the invention is shown and described herein as it is embodied in a rivet set.
The chief objects of the invention are to pro vide a tool of the character mentioned capable of functioning in locations that are too diflicult of access to enable use of conventional'tools ordinarily used. More specifically the invention aims to provide a percussive tool capable of transmitting percussion force or impact in an arcuate course; and to provide a tool of the character mentioned that will deliver the full striking power of the percussive apparatus. Another object is to provide a tool of the character mentioned capable of safe and easy manipulation by an operator. Other objects will be manifest as the description proceeds.
Of th accompanying drawing:
Fig. 1 is a side elevation of a tool embodying the invention, a part thereof being broken away and in section;
Fig. 2 is a section on the line 22 of Fig. 1;
Fig. 3 is a fragmentary perspective view of a pneumatic hammer with the improved tool operatively associated therewith, and work on which the tool is operating; and
Fig. 4 is an elevation, partly in section, of a tool head of modified construction.
Referring first to Fig. 3 of the drawing, there is shown a portion of a pneumatic hammer I0, and the improved tool of the invention, designated as a whole by the numeral l I, mounted in said hammer so as to be reciprocated thereby. The arrangement is such that the tool is adapted to transmit percussive force from the hammer ID to the work, herein shown as rivets I2, l2 in a fabricated metal structure I3. As shown in said figure, the rivets l2 are so positioned as to be practically inaccessible to conventional riveting devices, but readily are engaged by the tool H by reason of the flexible nature of the latter which e ables it to be flexed to arcuate or offset form wherein its striking head is out of alignment with the axis of the hammer I0. It will be understood that the flexing of the tool is manually effected by the operator of the apparatus, who grasps the tool in one of his hands (not 1 Claim. (C1. 74-501) shown) and guides it into engagement withthe work.
-The improved tool lil, shown in detail in. Figs. 1 and 2', comprises a shank portion 15 atone" end thereof, and a head portion 16 at the other end thereof, which shank and head are connected by a flexible metal element H, the latter being encased in a sleeve or sheath [8 of flexible material such as rubber composition. The shank portion I5 is arranged to be mounted in an end of a pneumatic hammer l0 and to be reciprocated thereby. The head 46 is specially designed for performing a particular type of work, and in the rivet set shown its outer end or striking face is recessed at I9 for engagement with a rivet, the recess being of such shape as to form a fiat head on the latter. The flexible metal element I1 is shown as a quadruple Keller type spring cable, which cable comprises laterally abutting con- Volutions of spring-metal wires of rectangular cross-section, with the result that the cable I! is axially incompressible, but readily may be flexed to arcuate form. The cable I! is united with the shank l5 and head [6 by having its end portions brazed or sweated into respective sockets or recesses I541, I611 formed in the confronting end portions of said shank and head. The rubber sheath l8 may be vulcanized in situ upon the cable IT, with its end portions overlying conthe adjacent peripheral surfaces of shank and head.
The arrangement is such that the tool readily may be flexed to enable the head [6 to be applied to work in otherwise inaccessible locations.
Such flexing of the tool is effected manually by the operator, at which time the sheath l8 on the tool. protects the operator's hand from being pinched by the cable H, the convolutions of which separate somewhat on the tension side when the tool is flexed. Being flexible and elastic, the rubber sheath l8 does not impair the flexing ability of the cable I1. The tool delivers the full percussive force of the hammer [0 to the head l6, and achieves the other advantages set out in the foregoing statement of objects.
Obviously the recess [9 in the head I6 may be of different shape for setting rivet heads of different shape. Furthermore, the head itself may be of different shape for performing operations other than riveting. For example, it may be shaped as a chisel for removing metallic projections or to cut clearances; it may be shaped as a 4 the scope thereof as defined by the appended claim. i
What is claimed is:
tamp for use in calking operations; or it may 5 constitute a hammer head for driving nails in difficult situations, such as toe-nailing operations.
In Fi 4 is shown'a tool head 22 of modified is formed at one end with an axial recess 22a in which a cable, such as the cable I! of the previously described embodimerit, is receivable.
A tool of the character described comprising a shank element at one end'thereof, a head element at the other end thereof, the confronting end portions of said shank and head being of reduced outside diameter and formed with re-v spective axial sockets, a flexible axiallydncomconstruction which may be employed in lieu of ,lupressibleelement composed of a lurality of conthe head l6 previously described. The head 22 centric metallic abutting coils of wires of rectangular cross-section having its end portions received in respective sockets in said shank and head and permanentlysecured therein, said coil At its opposite end the head is'forined with an 15 internally threaded recess 23 in which a complementally threaded work-engaging element 25 is receivable. The element 24 is shown as a chisel, and it will be obvious that it readily may be removed from the head 22 and an element of 20 different shape for a difierent purpose mounted in the head in lieu thereof. 1
Other modifications may be resorted to without departing from the spirit of the invention, or
element capable of transmittin a permissive 7 force in an arcuate course longitudinally of its structure, and, a sheath of flexible elastic material covering said coil element and adjacent reduced portions of shank and head and permanently bonded thereto, the outer surface of said sheath being flush with'adjacent peripheral sur faces of said shank and head.
ZOLLY o. VAN SCHWARTZ;