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Патент USA US2404580

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July 23, 1946.
‘Filed July 29,, 1945
w, *,
Patented July 23, 1946
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 Claim. (C1. 74-501)v
inns-invention‘ relatesto tools,;and more espe
cially it relates to tools having inherent ‘flexibility
to enable use thereof in places that are difficult
of access.
The tool is of primary utility in operative as
sociation with percussive apparatus such as the
pneumatic hammer, in which association it is
adapted for a number of uses. For the purpose
shown) and‘ guides it into engagement withthe
-The improved tool lil, shownv 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 ?exible metal element H, the latter being en
cased in a sleeve or sheath [8 of ?exible material
of illustration, but not limitation, the invention is
such as rubber composition. The shank portion
and in section;
Fig. 2 is a section on the line 2—2 of Fig. 1;
cable IT, with its end portions overlying con-V
tiguous portions of the shank and head as shown,
shown and described herein as it is embodied in 10 I5 is arranged to be mounted in an end of a
pneumatic hammer l0 and to be reciprocated
a rivet set.
thereby. The head 46 is specially designed for
The chief objects of the invention are to pro—
performing a particular type of work, and in the
vide a tool of the character mentioned capable of
rivet set shown its outer end or striking face is
functioning in locations that are too diflicult of
access to enable use of conventional'tools ordi 15 recessed at I9 for engagement with a rivet, the
recess being of such shape as to form a ?at head
narily used. More speci?cally the invention aims
on the latter. The ?exible metal element I1 is
to provide a percussive tool capable of transmit
shown as a quadruple “Keller” type spring cable,
ting percussion force or impact in an arcuate
which cable comprises laterally abutting con
course; and to provide a tool of the character
mentioned that will deliver the full striking power 20 Volutions of spring-metal wires of rectangular
cross-section, with the result that the cable I‘!
of the percussive apparatus. Another object is
is axially incompressible, but readily may be’
to provide a tool of the character mentioned ca
?exed to arcuate form. The cable I‘! is united
pable of safe and easy manipulation by an opera
with the shank l5 and head [6 by having its end
tor. Other objects will be manifest as the de
' portions brazed or sweated into respective sock-,
scription proceeds.
ets or recesses I541, I611 formed in the confronting
Of the accompanying drawing:
end portions of said shank and head. The rub
Fig. 1 is a side elevation of a tool embodying
ber sheath l8 may be vulcanized in situ upon the
the invention, a part thereof being broken away
Fig. 3 is a fragmentary perspective view of a
pneumatic hammer with the improved tool op
eratively associated therewith, and work on which
the tool is operating; and
Fig. 4 is an elevation, partly in section, of a
tool head of modi?ed construction.
Referring ?rst to Fig. 3 of the drawing, there
or the sheath may be vulcanized as a separate ele
ment and subsequently mounted on the tool.
Preferably the confronting end portions of the
shank ‘l5 and the head l6 are‘of reduced outside
diameter as shown, so that the rubber sheath [8
?ts thereover and has its outer face flush with
the adjacent peripheral surfaces of shank and
is shown a portion of a pneumatic hammer I0,
The arrangement is such that the tool readily
and the improved tool of the invention, desig
nated as a whole by the numeral l I, mounted in 40 may be ?exed‘ to enable the head [6 to be ap
plied to work in otherwise inaccessible locations. .
said hammer so as to be reciprocated thereby.
Such ?exing 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
fabricated metal structure I3. As shown in said > pinched by the cable H, the convolutions of which
separate somewhat on the tension side when the
?gure, the rivets l2 are so positioned as to be
tool is ?exed. Being ?exible and elastic, the rub
practically inaccessible to conventional riveting
ber sheath l8 does not impair the ?exing ability
devices, but readily ‘are ‘engaged by the tool H
of the cable I1. The tool delivers the full per
by reason of the ?exible nature of the latter
which enables it to be ?exed to arcuate or offset 50 cussive force of the hammer [0 to the head l6,
and achieves the other advantages set out in the
form wherein its striking head is out of align
foregoing statement of objects.
ment with the axis of the hammer I0. It will be
Obviously the recess [9 in the head I6 may be
understood that the ?exing of the tool is man
of different shape for setting rivet heads of dif
ually effected by the operator of the apparatus,
who grasps the tool in one of his hands (not 55 ferent shape. Furthermore, the head itself may
The arrangement is such that the tool is adapt
ed to transmit percussive force from the hammer
ID to the work, herein shown as rivets I2, l2 in a
be‘ of different shape for ‘performing operations
other than riveting. For example, it may be
the scope thereof as de?ned by the appended
shaped as a chisel for removing metallic projec
What is claimed is:
tions or to cut clearances; it may be shaped as a
A tool of the character described comprising a
tamp for use in calking operations; or it may 5 shank element at one end'thereof, a head ele
constitute a hammer head for driving nails in
ment at the other end thereof, the confronting
difficult situations, such as “toe-nailing” opera
end portions of said shank and head being of
reduced outside diameter and formed with re-v
In Fig. 4 is shown'a tool head 22 of modi?ed
spective axial sockets, a ?exible axiallydncom
' construction which may be employed in lieu of ,lupressibleelement composed of a plurality of con
the head l6 previously described. The head 22
is formed at one end with an axial recess 22a
in which a cable, such as the cable I‘! of the
centric metallic abutting coils of wires of rec
tangular cross-section having ‘its end portions
received in respective sockets in said shank and
previously described vembodimer‘it, is receivable. . head and permanentlysecured therein, said coil
At its opposite end the head is'forined with an 15 element capable of transmitting a permissive 7
internally threaded recess 23 in which a com
force in' an arcuate course longitudinally of its
plementally threaded work-engaging element 25
is receivable.
The element 24 is shownras a
chisel, and it will be obvious that it readily may
' structure, and, a sheath of ?exible elastic ma
terial covering said coil element and adjacent re
duced portions of, shank and head and perma
be removed from the head 22 and an element of 20 nently bonded thereto, the outer surface of said
different shape for a di?erent purpose mounted
sheath being ?ush with'adjacent,peripheralisure
in the head in lieu thereof.
Other modi?cations may be resorted to with
out departing from the spirit of the invention, or
faces of said shank and ‘head.
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