close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2133095

код для вставки
Oct. 11, 1938.
E, Ml HOLFELNE'R
2,133,095
' Í'ÍOÓLÍÍHANDLE ATTAGHING AND SHOCK ABSORBING MEANS
Filed July 2, 1936
17.4
.
Y 17%3
IN VEN TOR.
Y
EdWafdM/fÚ/fe/„Zf
/ëvua r M
` ATTORNEYSÉi
Patented Oct. 11, 1938
2,133,095
UNITED STATES PATENT OFFICE
2,133,095
TOOL HANDLE ATTACHING AND SHOCK
ABSORBING MEANS
Edward M. Holfelner, Columbus, Ohio, assigner
to The Ohlen-Bishop Company, Columbus,
Ohio, a corporation of Ohio
Application July 2, 1936, Serial No. 88,575
4 Claims. ~(Cl. 145-108)
My invention relates to tool handle attaching and a handle secured together in the manner in
and shock-absorbing means. It has to do more
particularly with means for securing a tool blade,
such as a saw blade, in a handle and with means
5 for absorbing shocks which result from using the
blade and to substantially prevent“l such shocks
from reaching the handle. Although I shall de
scribe my invention as particularly applicable to
a saw, it is to be understood that it is not lim
lU ited thereto.
` In the ordinary handsaw, one end of the metal
blade is inserted in a slot in a handle made of
wood or the like and is secured in the handle by
means of screws or rivets.
'I'he screws are initi
dicated wherein means is provided for absorbing
the shocks resulting when the blade is used and
for substantially preventing them from reaching
the handle.
In its preferred form my invention contem
plates the provision of a tool embodying a blade
having one end that ñts in a recess formed in a
handle member of wood or the like. The blade
is secured in the recess in the handle member by
means of screws which pass transversely through
corresponding openings formed in the handle
member and the end of the blade. Resilient ma
terial is preferably disposed between the blade and
15 ally tightened to such an extent that the blade the wall of the recess formed in the handle in
will be tightly gripped in the handle. However, ' which it is inserted. This resilient material is
when the wood of the handle contracts, due to adapted to compensate for expansion and con
changes in moisture conditions, the screws be
come loose and therefore the blade becomes loose
20 in the handle. This looseness is made more pro
nounced because of the fact that the holes in the
saw blade through which the screws pass must be
made slightly larger than the diameter of the
screws so as not to injure the threads on the
25 screws. At a later period, the wood of the handle
may again expand to such an extent that the
handle will again be tight on the blade. In fact,
it may expand to such an extent that the screws
will be so tight that cracking of the handle will
30 result.
These screws are usually made in two
pieces, and when the handle contracts so that
they become loose there is danger that the head
of the screw will fall off due to the fact that
the vibration resulting from use of the tool will
35 cause it to rotate.
.
Another disadvantage of saws and other sim
ilar tools made heretofore resides in the fact that
there has been no means provided for absorbing
the shock transmitted from the blade to the
40 handle during use of the tool. These shocks
transmitted to the handle cause fatigue and may
even cause some injury to the hand of the work
man using the tool.
One of the objects of my invention is to pro
45 vide a tool of the type indicated embodying a
blade and a handle member, the blade being se
cured to the handle member by means of screws,
»
rivets, or similar securing means, means also be
ing provided to compensate for expansion and
50 contraction of said handle and to prevent the
screws or similar means from becoming loose
thereby causing the handle to be firmly secured to
the blade at all times.
Another object of my invention is to provide
55 a tool of the type indicated embodying a blade
traction of the handle in order that the blade will
always tightly ñt within the recess and is adapted
to absorb shocks which are imparted to the blade. ~
The screws are surrounded with resilient mate
rial so that the metal blade will not contact with
the metal screws but, on the other hand, there
will be a resilient cushion between these mem
bers which will serve to absorb shocks imparted
to the blade. However', the resilient material sur
rounding the screws serves also to compensate for
expansion and contraction of the handle and to
maintain the screws tight at all times.
The preferred embodiment of my invention is
illustrated in the accompanying drawing wherein
similar characters of reference designate corre
sponding parts and wherein:
Figure 1 is a perspective view partly broken
away showing a portion of a handsaw blade with
a handle applied thereto according to my inven
tion.
Figure 2 is a section taken substantially along
line 2-~2 of Figure l.
'
Figure 3 is a plan view of a member adapted to 40
be inserted in the blade-receiving recess formed
in the handle.
Figure 4 is a perspective view of a member
adapted to be inserted in a screw-receiving open
mg.
With reference to the drawing, I have illus
trated a handsaw embodying a blade l and a
handle member 2 of usual construction. The
blade l has its end inserted in a recess or open
ended slot 3 formed in the handle 2 in the usual
manner. In order to secure the blade in the slot
formed in the handle a plurality of transversely
extending screws 4 are provided.
These screws
pass through corresponding openings 5 and 6
formed in the handle and the blade respectively.
55
2
2,133,095
It will be noted from the drawing that between
the blade I and the walls of the slot 3 is dis
posed. a cushion of material `I. This material may
be of any suitable flexible material, preferably
the opening 6 formed in the blade I and also with
the walls lof openings 5.
The member I4 will '
thus be compressed. Furthermore, the head 9 on
screw portionV 8 will tend to force the member I4
inwardly when the screw is tightened. This will Cl
Ul resilient, for example, rubber. It will be noted
that the material 'I 4extends over the side surfaces « force the member I4 tightly in contact with the
walls of the opening 5, du-e to the corresponding
of the blade and even around the rear edge there
of. In other words, ther-e is a resilient cushion taper of the outer surface of member I4 and the
between the blade I and all the walls of the slot 3 walls of openings 5. Also, the head Q pressing
so that the blade will not be in direct contact with inwardly on the outer end of member I4 will aid
the handle at any point. The rubber cushion 'i' is in forcing the member I4 tightly into contact with
preferably of such thickness that when the blade the wall of opening 6 in the blade.
It will be apparent that because the member I4
is inserted in the handle it will be necessary to
is compressed when the screw is initially tight
i compress the rubber cushion. Thus, if the han
dle member 2 contracts or shrinks so that the slot - ened, if the handle 2 contracts or shrinks, there- 1
3 will become larger, the rubber cushion ï will ex-_
pand to compensate for this contraction of the
handle and will maintain a tightñt between the
blade and the handle. On the other hand, if the
handle expands and thereby mak-es the slot 3
smaller, it will not be cracked or otherwise in
jured because the rubber cushion 'I will be com
pressed. Obviously, the rubber cushion will ab
sorb Vthe shocks imparted to the blade I during
the use of the saw, and will substantially prevent
said shocks from reaching the handle 2.
Each of the screws 4 embodies a screw portion ß
having a head 9 and a threaded end Il) and a nut
portion II embodying a head I2 and a tubular
Si) portion I3 which is threaded onto the threaded
end Il) ofthe screw portion 8. In order to provide
means for substantially preventing the shocks im
parted to the blade I from being transmitted to the
screws 4 and thence to the handle and in ord-er
to prevent the screws from coming loose at any
time I provide a member I4 which surrounds each
screw. This member I4 is preferably made of
the same material as th-e cushion l. The resilient
member I4 entirely surrounds the shank of the
screw portion 8 of the screw. vThe outer surface
40
of this member I4 (Figure 2) gradually tapers in
wardly towards the inner end thereof so that the
member is of substantially frusto-conical form.
Ribs I6 are provided on the screw portion 8 to
if the handle expands, thereby causing openings ~
5 tobecome smaller, the material of the member
I4 will further compress and no injury to the
handle will result. The inner end of the tubu
lar portion I3 of the head of the screw will always
bear against the end of member I4 firmly so that
there will be no danger of accidental turning and
loosening of the head portion of the screw. If
vthe handle expands to an unusual extent so that
the heads 9 and I2 bear on the handle with un
usual force, the resilient member 'I' will com 30
press to such an extent as to prevent splitting of
the. handle. The resilient tubular member I4
also serves as a cushion element to prevent shocks
beingV transmitted from the blade I through the
screw and thence to the'handle member.
35
In Figure 3, I illustrate a structure which will
facilitate insertion of the rubber insert into slot
3. This structure comprises a resilient member
1a, which is the same as member 'I, but which is
secured to a U-shaped member 'ib formed of 40
resilient metal. The member ‘la may be secured
to member ‘Ib in any suitable manner such as by
vulcanizing. It will be apparent that because the
resilient member ‘Ia is secured to the metal mem
prevent rotation of the member i4 thereon, the
ber lb, which surrounds member la, it will facili
tate insertion of member 'Ia in the slot 3.
I4.
In Figure 4, I show a modified resilient struc
ture for surrounding each of the screws 4. This
structure embodies a resilient member E40, which
is the same as member Ill. However, this member
54a is substantially surrounded by a member Illb
of substantially frusto-conical form which is
made of resilient metal. A slot Ilic is formed in
45 ribs extending into the material of the member
The walls of the openings 5 in the handle 2
are tapered the same as the tapered outer surface
of the member I4. It will be noted that the
resilient member I4 extends a considerable dis
tance inwardly past the point Il where the
threads on the member 8 terminate. It will also
be noted that the extreme inner end of the mem
ber I4 is bevelled as at I8, the bevel extending
towards the center of the screw and outwardlyr
Si)
by causing openings 5 to become larger, the mem
ber I4 will expand to compensate for contraction
-of the handle. Consequently, the screw will
always be tight in the handle. On the other hand,
the member Ißb. This composite structure will`
surround each of the screws 4, in the same man- ,
towards the head 9.
ner that member I4 surrounds a screw. The fact
The member Ill is preferably molded on the
screw portion 8. The screw portion 8 carrying
member I4 is inserted in the openingsv 5 of the
that member Mb, which is made of metal, sur
rounds resilient member YIda, facilitates insertion
of the member in the openings 5 and 6. Also,
handle and will extend through the opening 6
It will be noted that the member I4
will extend entirely through the blade. The
member I4 is preferably of such thickness that
it must be compressed when it is placed in the
openings 5 and 6. The nut portion Il of the
f in the blade.
since this metal member Iílb vwill extend through
vopening 6 in the blade I, it will protect member
i4@ from any danger of being cut by the blade I.
The slot Iíic in metal member Ißb will permit ex
pansion and contraction of member Elib at the
time that the resilient member Ilia expands and
screw is then threaded on the threaded end IG
contracts.
of member 8. The member I4 is of such a length
It will be apparent from the above that I have
that before the screw is tight in the handle,rthe.
end of the tubular portion I3 of the nut thereof provided a tool embodying a blade which is in
'
will contact with the bevelled end I3 of the serted in a recess in a handle portion and held 70
member I4. This bevel i8 is Yin such a direction therein by screws or similar securing means, `the
tool being provided with means for veffectively
that upon tightening of the nut II on the screw
portion 8, the material of the member I4 will be preventing the handle member from becoming
loose on the blade and for preventing loosening
forced outwardly away from the center of the
of the securing means. This means also func
screw
so
that
it
will
contact
firmly
with
the
wall
of
Z5.
2,133,095
tions to cushion the handle against shock im
parted to the blade.
Although I have described this invention as
being particularly applicable to ordinary hand
Cl
saws it will be apparent that it is applicable to
any of the Various types of saws which are pro
vided with handles. Furthermore, it is not limit
ed in its application to saws. It may be applied
to any tool wherein a blade or similar member
is held in a handle member by means of screws,
rivets or similar securing means.
Many other advantages will be apparent from
the preceding description, the drawing and the
following claims.
Having thus described my invention, what I
claim is:
1. In a tool of the type described, a blade mem
ber made of metal, a handle member, the blade
having a portion ñtting into a recess formed in
20 said handle member, an insert of resilient mate
rial between all of the surfaces of said recess and
the adjacent surfaces of said blade, said insert of
resilient material being of such thickness that it
is compressed when the blade is positioned in
suoli recess, a plurality of screws for securing the
blade in said recess extending transversely
through aligning openings formed in said blade
and said handle member, each of said screws em
bodying a screw portion and a nut portion, said
screw portion embodying a head and a shank
which is threaded at its inner end, said nut por
tion embodying a head and an internally thread
ed tubular portion adapted to be screwed onto
the threaded end of the screw portion, a member
formed of resilient material disposed in sur
rounding relation to the screw portion, said
member having a tapered outer surface which
cooperates with a correspondingly tapered surface
on the wall of the opening in the handle member
40 in which it is disposed, said resilient member ex
tending inwardly past the point on the screw
portion where the threads terminate, the extreme
inner end of said resilient member having a con
ical depression therein forming a beveled edge,
said resilient member being of such length that
the inner end of the nut portion will contact with
the bevelled end thereof before the screw is com
pletely tightened.
2. In a tool of the type described, a blade mem
ber, a handle member, means for securing the
blade member to the handle member, said means
comprising screws which extend through aligning
openings in said handle member and blade mem
ber, each of said screws embodying a screw por
tion and a nut portion, said screw portion em
bodying a head and a shank which is threaded at
3
its inner end, said nut portion embodying a head
and an internally threaded tubular portion
adapted to be screwed onto the threaded. end of
the screw portion, a member formed of resilient
material disposed in surrounding relation to the
screw portion, said member having a tapered
outer surface which cooperates with a corre
spondingly tapered surface on the Wall of the
opening in 'the handle member in which it is dis
posed, said resilient member extending inward
ly past the point on the screw portion where the
threads terminate, the extreme inner end of said
resilient member having a conical depression
.therein forming a bevelled edge, said resilient
member being of such length that the inner end
of the nut portion of the screw will contact with
`the bevelled end thereof before the screw is com
pletely tightened.
3. In a tool of the type described, a blade mem
ber, a handle member, means for securing the
blade member to the handle member, said means
comprising screws which extend through aligning
openings in said handle member and blade mem
ber, each of said screws embodying a screw por
tion and a nut portion, said screw portion em 25
bodying a head and a shank which is threaded
adjacent its inner end, said nut portion compris
ing a head and a tubular extension which is in
ternally threaded and is adapted to be screwed
onto the threaded shank or” the screw portion, a 30
member formed of non-metallic inherently re
silient material disposed in surrounding relation
to the main portion of the screw and adapted to
extend through the opening in the blade, said
resilient member extending inwardly past the 35
point on the screw portion where the threads ter
minate, said resilient member being of such
length that the inner end of the nut portion of
the screw will contact with the inner end there
of before the screw is completely tightened.
4. In a tool of the type described, a tool mem
40
ber, a handle member, means for securing the
tool member and the handle member together,
said means comprising securing members which
extend through aligning openings in said handle
member and tool member, and a member formed
45
of non-metallic inherently resilient material
disposed in surrounding relation to each of said
securing means, said member being substantial
ly surrounded by a resilient member formed of
metal, said metal member being adapted to con 50
tact with the edge of the cooperating opening in
the tool member and being adapted to protect
said non-metallic material.
EDWARD M. HOLFELNER
55
Документ
Категория
Без категории
Просмотров
0
Размер файла
522 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа