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Патент USA US2411099

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Nov. 12, 1946.
Filed Sept.> 4, 1944
837750271615’.Ä „Cory
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Patented Nov. 12, 1946
Thomas A. Long, Hammond, Ind.
Application September 4, 1944, Serial No. 552,585
7 Claims.
(Cl. 30----15)
A considerable effort has been extended here
tofore in making can openers more reliable and
The most satisfactory ones have
been those which included a crank carried by a
bracket extending out from a wall or other
mounting surface. In addition to the crank, such
can openers included a piercing lever which
can opener is mounted on a hinged door, the
plane of rotation of the handle coincides nearly
enough with the pivotal axis of the hinge of the
door so that turning of the handle produces
very little torque tending to swing the door.
Hence the door may be kept steady either by a
very little force applied with the other hand,
or by pressing it to the fully opened position so
moved the cutting blade to produce the initial
cutting of the can. It has been recognized that
that a slight axial pressure on the handle of
the extending bracket was sometimes objection 10 the crank holds the door pressed against the
able and various expedients have been worked
adjacent wall or other stop. The compactness of
out for minimizing this objection, as for exam
the opener also keeps it from taking up any ob
ple, by having the bracket swing into parallelism
jectionable amount of space within the cabinet
with the wall when not in use.
when the door is closed.
One object of the present invention is to pro 15
Additional objects and advantages will be ap
vide a satisfactory can opener which operates
parent from the following description and from
entirely by movement of the crank. This move
the drawing in which
ment operates the cutter blade to cause the ini
Fig. 1 is a front elevational view of the form of
tial piercing of the can as well as rotating the
the invention chosen for illustration;
can against the cutter blade. This is accom 20 y Fig. 2 is a vertical, sectional view taken ap
plished according to the preferred form of the
proximately on the line 2-2 of Fig. 1;
present invention by arranging a pin on the
Fig. 3 is a view corresponding to Fig. 1 but
crank which is so disposed as to engage a lever
showing the position of the parts after the crank
operating the cutter blade. The initial move
has been'turned slightly more than one revolu
ment of the crank actuates the cutter blade which 25
is then held out of engagement with the pin by
Fig. 4 isa fragmentary, side elevational view_of
the pressure of the rotating can thereon as the
a modification of the invention.
crank continues to be rotated to turn the can.
. Although the law requires a full and exact de
Reverse rotation of the crank withdraws the cut- . scription of at least one form of the invention,
ter blade from the can.
30 such as that which follows, it is, of course, the
Another object of the invention is to complete
ly eliminate the objectionable extending bracket.
purpose of a patent to cover each new inven
tive concept therein no matter how it may be
disguised by variations in form or additions of
This is accomplished by the extremely simple ex
pedient of putting the crank and the cutter on
further improvements; and the appended claims
the same side of the supporting plate and locat 35 are intended to accomplish this purpose by par
ing them suñiciently far apart so that the can
ticularly pointing out the parts, improvements,
does not interfere with the rotation of the crank.
or combinations in which the inventive concepts
Of course the knurled wheel driving the can is
are found.
driven by a train of gears or the like. This
might seem to be introducing complications 40 can opener includes a knurled drive wheel I0,
which would be too expensive, but gears for this
cutter blade II and a crank I2 all of which are
purpose can be simple stampings and hence the
carried by a base plate I3 having suitable per
cost is not prohibitive. Furthermore, the gear
forations I4 for receiving mounting screws. The
ing can give a mechanical advantage to the crank
crank I 2 drives a pinion I6 rigid therewith which
which permits using a fairly short crank and still 45 in turn drives idler pinions I'I, the last of which
having it turn easily enough-to be operated from
drives pinion I8 which in turn drives knurled
any position.
wheel I 0 which is rigid therewith. The crank I2
Another object of the invention is toprovide '
bears a pin 2| which engages the upper end of
a can opener which is suitable for mounting on
lever 22, the lower end of which forms the cut
a hinged door, such as the door of the cabinet 50 ting `blade II .1
in which the cans are kept. According to the
The operation of the can opener is as follows:
present invention, this is` accomplished largely
'I‘he starting position is shown in Fig. 1. A can
by the feature last mentioned and by keeping the
23 is slipped under the cutter blade I I and rested
entire assembly quite close to the surface on
with its rim on knurled roller Ill. The operator
which it is mounted. The result is that when a 55 then grasps the handle 24 of crank I2 and rotates
one and the crank I2 gives a mechanical ad
vantage of nearly four to one. These mechanical
advantages are multiplied so that not much more
the crank. Near the end of the first revolution,
the pin 2| strikes the lever 22 near its upper end
and urges it in a counterlockwise direction to
than one-twelfth the force required at the point
of piercing need be applied to the handle 24, ignor
ing friction.
press the cutter blade I I down through the cap of
the can to the position shown in Fig. 3. The pin
2l then slips past the lever 22, the movement of
which is limited by a stop pin 2S. The rotation of
the knurled wheel I0 turns the can forcing it
I claim:
l. A can opener including a lever of the first
classr having arms of unequal length;` a cutter
blade positioned at the free end of the shorter
to rotate against cutting blade Il, thus cutting
the top of the can around theperiphery thereof.
arm',` a drive Wheel for turning the can against
the cutter blade, a crank for turning the drive
can cover has been slit the desired distancem* wheel, and means responsive to the turning of
The pressure of the can against cutting blade I I
holds the lever 22 against the pin '25. When the
the reverse direction. The initial turning of the
the crank for engaging the longer arm tol swing
the same, thereby causing the cutterV blade to
crank in the reverse direction rotates the can
pierce'the can.
around its periphery, the crank 22 is turne`d_,_ir,_1_V4
against the back and side of the cutter blade
I I to urge it in the clockwise direction and move
it at least far enough so. that the pin> 2l moving
2. A can opener including a base plate, a crank
pivotably carried thereby on one side thereof,
a cutter blade carried on the same .side of the
base plate, and a drive wheel rotatably carried by
in _counterclockwise directionwíll engage the left
side of lever 22 andpress the lever ina clock
wise direction to move the parts back to the
the base plate and on theY same side thereof,
adapted to turn a can against the cutter blade
and driven by said crank.
1 until the crank I2 is again actuated and hence
surface on which the base plate is mounted.
the` _can opener is ready to receive another can.
It is thus seen that manipulation of the single
pivotably carried thereby on one side thereof, a
slightly in the reverse direction applyingVa-force
3. A can opener including a base plate, a
starting position shown- in Fig. l. Further clock
wise movement of the lever 22 maybe prevented 25 crank pivotably carried thereby on one side
thereof, a cutter blade carried on the same side
by a stop 2l. Optionally thenstop 2l could be
of the base plate, and adrive wheel rotatably
resiliently yieldable so that pressure o_n the handle
carríedby the base plate and on the same side
24 would raise the cutter-blade Il a little higher
thereor, adapted to turn a can against the cutter
than shown in Fig. lV so as to more completely
blade and driven by said crank, said base plate
release the can. „
being shaped to position the crank close to the
The parts will Ystay in the position shown` in Fig.
4. A cantopener including a base plate, a crank
cutter blade carried on the same side of the base
lever` _or crank l2 performs the Whole iob~ Fur
thermore, it. will. be observedthei; tbe plane of
rotation of the crank I2 is s_o,k close >tothe mount
plate,l and Va drive wheel rotatably carried bythe
base plate and on the same side thereof adapted
ine. Suríaoe that verylittle bereue will. be exerted
to,v turn a> can against the cutter blade> and driven
by any position _in_- ytliissurface. This makes it
practioeble to usee- bineeddoer es. Support .mem
ber and ¿also completely` _eliminates j any such
trouble es rúllîrleobt of screws.. or bendingV of
parte, Wbìoh sometimeerreviorslv resulted from
the. lerereee supplied .by the bracket extending
outwardly from the wall in past can openers.V _*
„It is believed the# e111 0f, tbedeieils will be _Suf
ficientlyA evident frontiK the drawing. l It may be
noted, however,` that .the various! pinionsvor gears
may befsta‘mped from Vsheetmetal sof that their
brseíol Crank through geara
5; A can opener including a base plate, a crank
pivotably carried. thereby on one side thereof, a
gutter blade carried ,on the same side of thebase
plate, and a drive wheelV rotatably carried by the
base plete and on,V the same -side thereof, adapted
45 to` turna can against `thecutter blade andl driven
by Said crank;> saidcrank being pivotal about an
eXLS vabove and. subst:antiallyy further from the
drirefwbeeluthen the length of the. crank.
6:, A earl: opener inoludìnga base plate', a crank
cost isextrernely low. `Also they are simple spur 50 pivotably carried thereby. on. one side thereof, a
ouiterfblede eerried on the Same sideorthebase
ge frs yof'uniform thickness sod that Vif it were
plat fand a drive- wheel rotatably carried> by the
desiredto cut them for greater accuracy, they
could be gang-cut. The crankV I2 may be made
baseplate, andl on the same side thereof, adapt
edz te. turn` ax; can- against` the cutter bladeY and
studl 3i Awhich may ` be rigid with veither the 55 driven Aby-,saïid< crank, said, crank being pivotal
about an- azris above and> substantiallyA further`
crank or the- pinion. Iand threaded into the other
from the drive wheel` than thev length of the
washers'32 forming the necessary spacers, and
rigid with'the'. pinion Iöby means of a> threaded
the washer 33 also forming a bearing member for
crankÀ and -being- connected to theÁ driveA wheel
bearing engagement with the base plate I3. The
assembly> of pinion I8 and knurled wheel Ill` is
similar except that the larger washer 32 is not
required andthe threads on stud 34are left-hand
through’speed reducing means to reduce the
60 torque required> to turnl the crank.
7, A_canî opener including a» cutter blade car
ried by a» pivoted- lever of theñrst class, a drive
Wheel rotatable inv one direction’for» turning the
edwhile those on stud. 3l are right-handed. As a
canî againstthefcutter‘blade, a crankkfor turning
matter of fact, studs 3I~ and 34 can be threaded to
both members instead of having a rigid engage 65. thedrívewheelin said direction, a projection on
inentwith one if preferred,
HIffa cutting wheel 4 Ifis preferred to-a stationary
cutting blade, it may be mounted at the bottom
of( lever 22, as seen in Fig. 4, '
said- crank`A~ adapted„ .when the crank is.- turnedv to
rotate the drive Wheel in said direction,_to en
gvagefsaidîlever and'pivot> it in the opposite direc
tipn, td pierce the can,Y with - the` cutter-- blade,` the
The hardest part of can opening'heretoïf‘ore has 70 mpvement‘of; the` canA aguainstvthe cuttery .blade
u‘suallybeen` the initial piercing of thev can.> -‘This
is'quite easy in the 'present invention. The lever
2-2gives a mechanical advantage of nearly three to
then ì _urgingy the4 lever. further in lthe, same f direc
tion,._,and.the projection thenclearing`v^ the lever.,_
Y .
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