US2427580A - Plaster cast cutter - Google Patents

Plaster cast cutter Download PDF

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Publication number
US2427580A
US2427580A US58612945A US2427580A US 2427580 A US2427580 A US 2427580A US 58612945 A US58612945 A US 58612945A US 2427580 A US2427580 A US 2427580A
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Prior art keywords
provided
shaft
cutter
end
bearing
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Expired - Lifetime
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Homer H Stryker
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Homer H Stryker
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F15/00Auxiliary appliances for wound dressings; Dispensing containers for dressings or bandages
    • A61F15/02Devices for cutting bandages of any kind, e.g. shears, cast-cutting saws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B19/00Other reciprocating saws with power drive; Fret-saws
    • B27B19/006Other reciprocating saws with power drive; Fret-saws with oscillating saw blades; Hand saws with oscillating saw blades
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8798With simple oscillating motion only
    • Y10T83/8804Tool driver movable relative to tool support
    • Y10T83/8805Cam or eccentric revolving about fixed axis

Description

Sept. 16, 1947.A H; H'. sTRYKER 2.427,580

PLASTER CAST CUTTER Filed April 2, 1945 AITORNEYJ.

Patented Sept. i6, 54?

UNITED STATES PATENT OFFICE 9 Claims. (Cl. 30-166) 'I'his invention relates to improvements in plaster cast cutter.

The main objects of this invention are:

First, to provide a cutting implement which is highly eicient for cutting casts and the like and at the same time is not likely to injure a patient or the user or garments or fabric with which it may come in contact.

Second, to provide a cutting implement which has a wide range of uses and which is very convenient to use and is compact and durable.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is dened and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a side elevation of an implement embodying my invention in a desirable form.

Fig. 2 is a fragmentary view in section on line 2-2 of Fig. 1, the cutter being partially broken away and partially shown by dotted lines.

Fig. 3 is a sectional view on line 3-3 of Fig. 1.

Fig. 4 is a fragmentary view mainly in longitudinal section on line 4--4 of Fig. 3.

Fig. 5 is a fragmentary perspective view with the cutter head removed.

In the embodiment of my invention illustrated in the accompanying drawing, I represents the motor casing, 2 the circuit connection thereto and 3 a control switch. The motor casing is provided with a tubular end extension 4 constituting part of one end member of the motor housing 5, this extension being adapted as a hand-hold or grip. At its outer end the extension is provided with a bearing 6 for the motor shaft 1.

The motor shaft is provided with a crank pin or eccentric pin 8 having an anti-friction roller 9 mounted thereon. The shaft is preferably provided with a counter-weight I0 for the crank pin and its roller, the purpose being to minimize vibration by counterbalancing the offset or eccentrically disposed crank pin element.

The cutter head II is provided with a bore I2 receiving the end I3 of the extension 4, this end being somewhat enlarged in the embodiment illustrated. The head member has a longitudinal slot I4 providing a pair of ears I5 receiving the clamping screws I6 so that the cutter head is detachably secured upon the housing extension 4. The cutter head is chambered at Il to receive the crank pin and counterweight, a closure I8 being provided for the end of the housing extension, this closure being polygonal in shape and fitting 2 Y Y within a recess I9 provided therefor, a sealing disk 20 being arranged on the inner side of this closure member.

The head member is provided with a. face plate 2| secured by screws 22. The body of the cutter head and the face plate have aligned bearings 23 and 24 provided with bushings 25 for the cutter shaft 26. This cutter shaft is provided with an arm 21 secured to the shaft by the pin 28 and having a longitudinal slot 29 engaged by the crank pin roller 9. This slot is of Such dimensions as to slidably embrace the crank pin roller and fits the same relatively closely so that there is no lost. motion and noise resulting from operation.

The cutter 30 is preferably in the form of a disk having a saw-tooth edge 3l, the teeth being preferably relatively fine as shown in Fig. 2.

'I'he throw or eccentricity of the crank pin isA such that the stroke of the cutter is relatively short. The implement shown in Fig. 1 isl a fullsize commercial implement and has a, stroke of approximately one-eighth of an inch. 'I'his is indicated by the lines 33 in Fig. 2.

The end of the cutter shaft is reduced at 34 to receive the clamping sleeve 35, the cutter' being arranged at the outside of this sleeve and clamped against it by means of the clamp member 36 and the screw 31 tapped into the end of the shaft.

My improved implement is highly efficient in the cutting of casts or other hard substances but yielding surfaces or materials are not cut or injured thereby in the event the cutter should accidentally contact ythe skin of a person and `it does not cut fabrics or other objects unless they are supported by a fairly rigid backing.

My improved implement has, however, a wide range of uses such for example as cutting bone, plastics, wood and even metal.

I have illustrated and described my invention in a very practical embodiment thereof. I have not attempted to illustrate or describe other embodiments or adaptations as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent. is:

1. An implement for cutting casts and the like comprising a motor provided with a casing hav ing a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and 3 provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, an eccentric pin on the end of said shaft provided with an anti-friction roller, said shaft being provided with a counterbalance for said pin and roller, a closure for the outer end of said housing extension disposed on the inner side of said counterbalance and roller, a chambered cutter head mounted on the end of said housing extension. said cutter head being provided with a bearing disposed below said housing extension, a cutter shaft disposed in said bearing in said head and provided .vith an arm slotted to receive said roller on said pin, a face plate for said cutter head provided with a bearing supporting the cutter shaft at the outer side of said arm, and a toothed cutter secured to the end of said shaft.

2. An implement for cutting casts and the like comprising a motor provided with a casing having a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, an eccentric pin on the end of said shaft provided with an anti-friction roller, said shaft being provided with a counterbalance for said pin and roller, a chambered cutter head mounted on the end of said housing extension, said cutter head being provided with a bearing disposed below said housing extension, a cutter shaft disposed in said bearing in said head and provided with an arm slotted to receive said roller on saidpin, a face plate for said cutter head provided with a bearing supporting the cutter shaft at the outer side of said arm, and a toothed cutter secured to the end of said shaft.

3. An implement for cutting casts and the like comprising a motor provided with a casing having a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, an eccentric pin on the end of said shaft provided with an anti-friction roller, a chambered cutter head mounted on the end of said housing extension, said cutter head being provided wtih a bearing disposed below said housing extension, a cutter shaft disposed in said bearing in said head and provided with an arm slotted to receive said roller on said pin, a face -plate for said cutter head provided with a bearing supporting the cutter shaft at the outer side of said arm, and a toothed cutter secured to the end of said shaft.

4. An implement for cutting casts and the like comprising a motor provided with a casing having a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and provided with a motor shaft bearing at its outer end, a motor shaft disposed Within said housing and supported at its outer end in said bearing, an eccentric pin on the end of said shaft provided with an anti-friction roller, a chambered cutter head having a bore receiving the end of said housing extension, said head being split at one side of said bore and provided with clamping screws whereby it is clamped upon said extension,

said cutter head being provided with a bearing disposed below said housing extension, a cutter shaft disposed in said bearing in said head and provided with an arm slotted to receive said roller on said pin, a face plate for said cutter head provided with a bearing supporting the cutter shaft at the outer side of said arm, and a toothed cutter secured to the end of said shaft.

5. An implement for cutting casts and the like comprising a, motor provided with a casing having a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, an eccentric pin on the end of said shaft provided with an anti-friction roller, said shaft being provided with a counterbalance for said pin and roller, a chambered cutter head mounted on the end of said housing extension and provided with a cutter shaft bearing, an oscillating cutter shaft disposed in said bearing and provided with an arm slotted to receive said roller on said pin, the width of the slot being such as to provide a relatively close t for said roller while permitting free rotation thereof and free movement longitudinally of the slot, and a toothed cutter on and oscillated by said shaft, the eccentricity of said crank pin being such that the cutter is actuated with a relatively short oscillating stroke.

6. An implement for cutting casts and the like comprising a motor provided with a casing having a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and.

provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, an eccentric pin on the end of said shaft provided with an anti-friction roller, said shaft being` provided with a counterbalance for said pin and roller, a chambered cutter head mounted on the end of said housing extension and provided with a cutter shaft bearing, an oscillating cutter shaft disposed in said bearing and provided with an arm slotted to receive said roller on said pin, and a toothed cutter on and oscillated by said shaft.

7. An implement for cutting casts and the like comprising a motor provided with a casing having a forwardlyprojecting tubular end extension adapted as a shaft housing and as a grip and provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, an oscillating crank pin on the end of said shaft, a chambered cutter head on the end of said housing extension provided with a bearing disposed below said housing extension, a cutter shaft disposed in said bearing in said head and provided with an arm coacting with said pin, and a toothed cutter on and oscillated by said shaft, the eccentricity of said crank pin being such that the cutter is actuated with a relatively short oscillating stroke of the order of one-eighth of an inch.

8. An implement for cutting casts and the like comprising a motor provided with a casing having a forwardly projecting tubular end extension adapted as a shaft housing and as a grip and provided with a motor shaft bearing at its outer end, a motor shaft disposed within said housing and supported at its outer end in said bearing, a crank pin on the end of said shaft, a. chambered cutter head on the end of said housing extension provided with a bearing disposed below said housing extension, an oscillating cutter shaft disposed in said bearing in said head and provided with an arm coacting with said pin, and a toothed cutter on and gscillated by said shaft, the eccentricity of said crank pin being such that the cutter is actuated with a relatively short oscillating an arcuate path about said rockshait and in a l5 1,763,730

plane substantially, at right angles to said rotary and rockshafts.

HOMER H. STRYmSR.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 436,804 Roberts Sept. 23, 1890 1,951,880 Niederhofer Mar. 20, 1934 2,163,018 Bernier June 20, 1939 Von Lackum June 17, 1930

US2427580A 1945-04-02 1945-04-02 Plaster cast cutter Expired - Lifetime US2427580A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US2427580A US2427580A (en) 1945-04-02 1945-04-02 Plaster cast cutter
GB867647A GB630801A (en) 1945-04-02 1947-03-31 Improvements in and relating to reciprocating saws

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2427580A US2427580A (en) 1945-04-02 1945-04-02 Plaster cast cutter
GB867647A GB630801A (en) 1945-04-02 1947-03-31 Improvements in and relating to reciprocating saws

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US2427580A true US2427580A (en) 1947-09-16

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US2427580A Expired - Lifetime US2427580A (en) 1945-04-02 1945-04-02 Plaster cast cutter

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557364A (en) * 1948-06-15 1951-06-19 Orthopedic Frame Co Surgical saw blade
US2582511A (en) * 1950-06-30 1952-01-15 Orthopedic Frame Company Surgical tool for cutting graft skin
US2657719A (en) * 1951-02-06 1953-11-03 Harold S Forsberg Adjustable power-driven circular saw
US3505733A (en) * 1967-10-09 1970-04-14 Ingersoll Rand Co Power operated hand tool
US4252121A (en) * 1977-12-09 1981-02-24 Arnegger Richard E Separating device
US4361956A (en) * 1981-01-14 1982-12-07 Kirk Norbert A Oscillating saw accessory
EP0283269A2 (en) * 1987-03-16 1988-09-21 Ace Medical Company Microsurgical apparatus
EP0314257A2 (en) * 1987-03-16 1989-05-03 Ace Medical Company Microsurgical tool
US4922612A (en) * 1988-06-16 1990-05-08 Henry E. Bruce Oscillatory saw
US5468247A (en) * 1993-05-26 1995-11-21 Stryker Corporation Saw blade for powered medical handpiece
US20060179667A1 (en) * 2003-08-06 2006-08-17 Osamu Izumisawa Automatic saw
US7299553B1 (en) 2005-10-26 2007-11-27 Brann Jimmy N Zero-offset power handsaw
CN102950332A (en) * 2011-08-18 2013-03-06 苏州宝时得电动工具有限公司 Portable cutting machine
US9168188B2 (en) 2007-11-13 2015-10-27 Orthopediatrics Corporation Cast removal system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US436804A (en) * 1890-09-23 roberts
US1763730A (en) * 1929-02-07 1930-06-17 Herman Julius Von Lackum Surgical saw
US1951880A (en) * 1931-12-12 1934-03-20 Niederhofer Johann Electric device for cutting gypsoplastic dressings
US2163018A (en) * 1937-02-25 1939-06-20 George A Scheibel Erasing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US436804A (en) * 1890-09-23 roberts
US1763730A (en) * 1929-02-07 1930-06-17 Herman Julius Von Lackum Surgical saw
US1951880A (en) * 1931-12-12 1934-03-20 Niederhofer Johann Electric device for cutting gypsoplastic dressings
US2163018A (en) * 1937-02-25 1939-06-20 George A Scheibel Erasing device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557364A (en) * 1948-06-15 1951-06-19 Orthopedic Frame Co Surgical saw blade
US2582511A (en) * 1950-06-30 1952-01-15 Orthopedic Frame Company Surgical tool for cutting graft skin
US2657719A (en) * 1951-02-06 1953-11-03 Harold S Forsberg Adjustable power-driven circular saw
US3505733A (en) * 1967-10-09 1970-04-14 Ingersoll Rand Co Power operated hand tool
US4252121A (en) * 1977-12-09 1981-02-24 Arnegger Richard E Separating device
US4361956A (en) * 1981-01-14 1982-12-07 Kirk Norbert A Oscillating saw accessory
EP0314257A3 (en) * 1987-03-16 1989-12-06 Ace Medical Company Microsurgical tool
EP0283269A2 (en) * 1987-03-16 1988-09-21 Ace Medical Company Microsurgical apparatus
EP0283269A3 (en) * 1987-03-16 1988-12-07 Ace Medical Company Microsurgical apparatus
EP0314257A2 (en) * 1987-03-16 1989-05-03 Ace Medical Company Microsurgical tool
US4922612A (en) * 1988-06-16 1990-05-08 Henry E. Bruce Oscillatory saw
US5468247A (en) * 1993-05-26 1995-11-21 Stryker Corporation Saw blade for powered medical handpiece
US5702415A (en) * 1993-05-26 1997-12-30 Stryker Corporation Chuck and blade for powered medical handpiece
US20060179667A1 (en) * 2003-08-06 2006-08-17 Osamu Izumisawa Automatic saw
US7299553B1 (en) 2005-10-26 2007-11-27 Brann Jimmy N Zero-offset power handsaw
US9168188B2 (en) 2007-11-13 2015-10-27 Orthopediatrics Corporation Cast removal system
CN102950332A (en) * 2011-08-18 2013-03-06 苏州宝时得电动工具有限公司 Portable cutting machine

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Publication number Publication date Type
GB630801A (en) 1949-10-21 application

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