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Publication numberUS2427580 A
Publication typeGrant
Publication dateSep 16, 1947
Filing dateApr 2, 1945
Priority dateApr 2, 1945
Publication numberUS 2427580 A, US 2427580A, US-A-2427580, US2427580 A, US2427580A
InventorsStryker Homer H
Original AssigneeStryker Homer H
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Plaster cast cutter
US 2427580 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

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

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US436804 *Dec 4, 1889Sep 23, 1890 roberts
US1763730 *Feb 7, 1929Jun 17, 1930Herman Julius Von LackumSurgical saw
US1951880 *Aug 10, 1932Mar 20, 1934Johann NiederhoferElectric device for cutting gypsoplastic dressings
US2163018 *Feb 25, 1937Jun 20, 1939George A ScheibelErasing device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2557364 *Jun 15, 1948Jun 19, 1951Orthopedic Frame CoSurgical saw blade
US2582511 *Jun 30, 1950Jan 15, 1952Orthopedic Frame CompanySurgical tool for cutting graft skin
US2657719 *Feb 6, 1951Nov 3, 1953Forsberg Harold SAdjustable power-driven circular saw
US3505733 *Oct 9, 1967Apr 14, 1970Ingersoll Rand CoPower operated hand tool
US4252121 *Dec 5, 1978Feb 24, 1981Arnegger Richard ESeparating device
US4361956 *Jan 14, 1981Dec 7, 1982Kirk Norbert AOscillating saw accessory
US4922612 *Jun 16, 1988May 8, 1990Henry E. BruceOscillatory saw
US5468247 *Oct 19, 1994Nov 21, 1995Stryker CorporationSaw blade for powered medical handpiece
US5702415 *Sep 8, 1995Dec 30, 1997Stryker CorporationChuck and blade for powered medical handpiece
US7299553Oct 26, 2005Nov 27, 2007Brann Jimmy NZero-offset power handsaw
EP0283269A2 *Mar 16, 1988Sep 21, 1988Ace Medical CompanyMicrosurgical apparatus
EP0314257A2 *Mar 16, 1988May 3, 1989Ace Medical CompanyMicrosurgical tool
Classifications
U.S. Classification30/392, 606/178, 83/602, 602/5
International ClassificationA61F15/02, A61F15/00, B27B19/00
Cooperative ClassificationA61F15/02, B27B19/006
European ClassificationB27B19/00D, A61F15/02