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Publication numberUS3357102 A
Publication typeGrant
Publication dateDec 12, 1967
Filing dateSep 1, 1965
Priority dateSep 1, 1965
Publication numberUS 3357102 A, US 3357102A, US-A-3357102, US3357102 A, US3357102A
InventorsHarvey Korshak
Original AssigneeScovill Manufacturing Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Power operated knife
US 3357102 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Dec. 12, 1967 H. KORSHAK POWER OPERATED KNIFE 2 Sheets-Sheet 1 Filed Sept. 1, 1965 .K RA 8 B 3 1.\ n mm H rm- N 9 .Iiialv SN \9 1 l n V m w R a Q n q H V TQ ATTORNEY H. KORSHAK Dec. 12, 1967 POWER OPERATED KNIFE 2 Sheets-Sheet Filed Sept. 1, 1965 INVENTOR HARVEY KORSHAK ATTORNEY United States Patent 3,357,102 POWER OPERATED KNIFE Harvey Korshak, Skokie, Ill., assignor to Scovill Manufacturing Company, Waterbury, Conn., a corporation of Connecticut Filed Sept. 1, 1965, Ser. No. 484,370 Claims. (Cl. 30-272) This invention relates to a power operated knife and particularly to mechanism for reciprocating a pair of knife blades longitudinally relatively to each other.

One of the objects of the invention is to provide an integrally formed gear and crank unit for imparting reciprocatory motion to a pair of driver bars and carriers in which the blades are detachably mounted.

Another object is to provide a gear bracket in which the combination gear and crank unit is mounted.

Another object is to provide anti-friction means in the gear bracket for free smooth movement of the driver bars relatively to the bracket, and to provide anti-friction means ina front guide member for frictionless movement 3 of the blade carriers relatively to the guide when the con nected driver bars and blade carriers are reciprocated by the cranks.

Other objects and advantages will appear from the drawings and following description.

In the drawings:

FIG. 1 is a longitudinal vertical sectional view, partly in elevation, on an enlarged scale, of the forward end of a power operated knife embodying my invention, the knife blades being omitted.

FIG. 2 is a top plan view of the mechanism shown in FIG. 1, with the upper housing removed.

FIG. 3 is a transverse vertical sectional view in the plane of the line 33 of FIG. 1.

FIG. 4 is a transverse vertical sectional view in the plane of the line 4-4 of FIG. 2.

FIG. 5 is a transverse vertical sectional view in the plane of the line 55 of FIG. 1.

FIG. 6 is an elevational side view of the integral gear and crank unit as viewed in the plane of the line 66 of FIG. 4.

FIG. 7 is an elevational side view of the integral gear and crank unit as it appears in the plane of the line 77 of FIG. 4.

In that embodiment of the invention shown in the drawings, a housing 10 encloses a motor 11, motor shaft 12, driver bars 13, 13 connected to blade carriers 14, 14, and driving mechanism located between the motor and the driver bars for imparting reciprocatory motion to the connected driver bars and carriers. Tangs 15, 15, of knife blades (not shown) are mounted in and retained by the carriers 14.

The driving mechanism comprises a pinion 20 and spacer 19 fixed on the motor shaft 12, the pinion meshing with a bevel gear 21 formed integrally with a hub 22 provided with cranks 23, 24 at opposite ends. The hub 22 is loosely mounted on a transversely extending shaft 25. The shaft 25 is mounted at opposite ends in a gear bracket comprising a verticaly disposed back plate 26, with motor shaft bearing 27, circumferential flange 28, and a pair of forwardly extending side arms 29, 29. The arms 29 are provided with registering apertures for reception of the ends of the shaft 25, and are spaced apart to receive between them the integral unit consisting of the gear 21, hub 22 and cranks 23, 24, as shown in FIGS. 2 and 4.

The gear bracket back plate 26 is retained in the position shown in FIG. 1 by the support 30 in housing 10 and by upper and lower hook ended leaf springs 31, 31,

which overlie the motor 11 and engage the flange 28 of the gear bracket.

The back plate flange 28 of the gear bracket, below the arms 29, is provided with an aperture or recess 32 at each side for mounting therein a transverse shaft 33 (FIGS. 1 and 5) staked to the plate at 34. A pair of rollers 35 are rotatable on the shaft 33 in such position that the driver bars 13 rest on the rollers for free smooth movement thereover when the driver bars are reciprocated by the mechanism described hereinafter. Projections for guiding the driver bars are indicated at 36.

The driver bars 13 are flat and rectangular in cross section in their rearward portion as shown in FIG. 5. In the median portion 40, each of the driver bars widens from top to bottom and is provided with an opening 41 as shown in FIGS. 1 and 4. The opening is wide enough to receive one of the cranks 23 or 24 between the vertical parallel edges of the opening 41. The opening 41 is deep enough from top to bottom to accommodate the eccentric movement of the cranks 23, 24, as shown in FIG. 4. The forward ends of the driver bars 13 are connected to the blade carriers 14 in which are mounted the blade tangs 15. Thus reciprocatory motion is transmitted to the driver bars, carriers and blade tangs by rotation of the motor shaft 12, pinion 20, gear 21, hub 22 and cranks 23, 24, engaging the driver bars 13 through the openings 41 in the portion 40 of said bars.

The carriers 14, as shown in section in FIG. 3, are movable longitudinally in a front guide 50 in the end of the housing 10. Antifriction rollers 51 are loosely mounted on the transverse shaft 52 fixedly mounted in guide 50 for hearing on the carriers 14. The front guide 50 is fastened in the housing by a rivet 53.

The gear and crank unit, mounted in its special gear bracket, provides a compact easily assembled means for translating the rotary motion of the motor shaft into reciprocatory movements in opposite directions of the blade drivers, carriers and blade tangs. The anti-friction means mounted in the gear bracket and in the front guide permit guided frictionless movements of the driver bars and carriers in predetermined planes.

Changes may be made in details of construction and form an arrangement of parts without departing from the scope of the invention as defined by the appended claims.

I claim:

1. In a power operated knife having a housing, a motor, motor shaft, a pair of driver bars, a pair of blade carriers connected to the bars, and a pair of knife blades having tangs mounted in the carriers, mechanism between the motor and driver bars for reciprocating the driver bars, carriers and blades comprising (a) a pinion fixed on the motor shaft,

(b) a gear assembly including a transversely extending shaft, and an integral bevel gear, hub and cranks at opposite ends of the hub mounted on the transverse shaft,

(c) a gear bracket connected to the motor comprising a back plate extending transversely of the housing and radially of the motor shaft between the motor and the pinion, and a pair of arms extending forwardly from the back plate and spaced apart to receive the gear assembly between the arms and with the transverse shaft mounted in the arms and the pinion meshing with the bevel gear,

(d) a hook ended leaf spring overlying the motor and engaging the back plate of the bracket, and

(e) means on the driver bars engaged by said cranks for imparting reciprocatory movement to the driver bars when the bevel gear is rotated by the pinion.

2. In a power operated knife having a housing, a motor, motor shaft, a pair of blade carriers, and a pair of knife blades having tangs mounted in the carriers, mechanism between the motor and carriers for reciprocating the carriers and blades comprising (a) a pinion fixed on the motor shaft,

(b) a gear assembly including a transversely extending shaft, and an integral bevel gear, hub and cranks at opposite ends of the hub mounted on the transverse shaft,

(c) a gear bracket comprising a back plate extending transversely of the housing and radially of the motor shaft between the motor and the pinion, and a pair of arms extending forwardly from the back plate and spaced apart to receive the gear assembly between the arms with the transverse shaft mounted in the arms and the pinion meshing with the bevel gear,

(d) said gear bracket back plate having slots therein and a roller mounted adjacent each slot for passage of the carriers over said rollers and through said slots, and

(e) means on the carriers engaged by said cranks for imparting reciprocatory movement to the carriers when the bevel gear is rotated by the pinion.

3. In a power operated knife having a housing, a motor, motor shaft, a pair of driver bars, a pair of blade carriers connected to the bars, and a pair of knife blades having tangs mounted in the carriers, mechanism between the motor and driver bars for reciprocating the driver bars, carriers and blades comprising (a) a pinion fixed on the motor shaft,

(b) a gear assembly including a transversely extending shaft, and an integral bevel gear, hub and cranks at opposite ends of the hub mounted on the transverse shaft,

(c) a gear bracket comprising a back plate extending transversely of the housing and radially of the motor shaft between the motor and the pinion, and a pair of arms extending forwardly from the back plate and spaced apart to receive the gear assembly between the arms with the transverse shaft mounted in the arms and the pinion meshing with the bevel gear, ((1) said gear bracket back plate having slots therein and a roller mounted adjacent each slot for passage of the driver bars over said rollers and through said slots, and (e) means on the driver bars engaged by said cranks for imparting reciprocatory movement to the driver bars when the bevel gear is rotated by the pinion. 4. The power operated knife defined by claim 3 which includes a front guide fixed on the housing, a roller on a transversely extending shaft in said front guide for engaging the blade carriers.

5. A power operated knife comprising (a) a motor shaft,

(b) a pair of driver bars and blade carriers,

(c) means operatively connecting the motor shaft and the driver bars and blade carriers for transmitting reciprocatory movements to said driver bars and carriers,

(d) a bracket connected to the motor and extending transversely of the motor shaft provided with slots through which the driver bars pass when reciprocated, and

(e) rollers mounted adjacent said slots and beneath said driver bars for movement of the bars over the rollers.

References Cited UNITED STATES PATENTS 1,826,187 10/1931 Pickering 14368 2,764,188 9/1956 Hoffman 14368 3,203,095 '8/ 1965 Nelson 30-272 3,203,096 8/1965 Beisheim et al 30--272 FOREIGN PATENTS 1914 Great Britain.

JAMES L. JONES, 311., Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1826187 *Jan 17, 1929Oct 6, 1931Portable Electric Tool CorpJig saw
US2764188 *Oct 7, 1953Sep 25, 1956Hoffman Simon JReciprocating saw with reversible blade
US3203095 *Jul 29, 1963Aug 31, 1965Gen ElectricPower-operated knife
US3203096 *Jul 29, 1963Aug 31, 1965Gen ElectricElectric slicing knife
GB191400090A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4631827 *Jan 9, 1985Dec 30, 1986Black & Decker, Inc.Electric knife drive mechanism
US5165488 *Apr 20, 1992Nov 24, 1992Liu Chen HaiElectric vibrator tool
DE3730847A1 *Sep 15, 1987Mar 30, 1989Georg KrauseSchneidgeraet mit fremdkraftantrieb
Classifications
U.S. Classification30/277.4
International ClassificationB26B7/00
Cooperative ClassificationB26B7/005
European ClassificationB26B7/00A