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US 4,545,515 AGranted
Sheet cutting machine
AssigneeThe Fletcher-Terry Company
InventorVincent T. Kozyrski
Life of this patent
Estimating the term…
Abstract
A machine for manually cutting glass, plastic and mat employs a head having a unique breaker assembly by which the break-out of scored plastic sheet is readily effected, and in which the pillar post for the cutting element is supported to provide a blade repositioning feature. The head also includes means for maintaining the cutting element in its extended position, particularly to enhance effectiveness for cutting fibrous or cellular mat, cardboard, and the like.
Claims20
A cutting head for use in a manual sheet cutting machine, comprising:
- A. an elongated body having a handle portion thereon and means for supporting said head for movement along a cutting path;
- B. a cutter assembly including
- (1) an elongated rocker arm having a head portion adjacent the forward end of said body, said rocker arm being pivotably mounted on said body for movement of said head portion between downwardly extended and upwardly retracted positions,
- (2) a cutting member having a cutting element thereon,
- (3) means for removably mounting said cutting member on said head portion of said rocker arm, said mounting means cooperating with said cutting member to permit slight longitudinal shifting of said cutting element in a forward direction and to bias said cutting member rearwardly against such shifting,
- (4) means for biasing said rocker arm toward said extended position of said head portion, and
- (5) first operating means on said body, accessible from said handle portion thereof and movable in one direction to elevate said rocker arm from said extended position toward said retracted position of said head portion against said biasing means, and movable in another direction to maintain said rocker arm in said extended position against upward deflection;
- and
- C. a breaker assembly including
- (1) a carriage pivotably mounted on said body and having a shaft portion extending transversely thereacross, said carriage being movable between downwardly extended and upwardly retracted positions of said shaft portion,
- (2) a set of rollers rotatably mounted on said shaft portion, and comprising
- (a) a generally cylindrical central roller having a shallow circumferential groove extending about the midsection thereof to define thereon oppositely directed inwardly tapered generally conical sections, and
- (b) a matched pair of outer rollers disposed outwardly of the ends of said central roller, said rollers being of a diameter larger than the maximum diameter of said central roller,
- (3) means for biasing said carriage toward said retracted position of said shaft portion, and
- (4) second operating means on said body, accessible from said handle portion thereof, for forcing said carriage toward said extended position against said biasing means;
- whereby said cutting head can be used for cutting glass, mat, and plastic sheet in a range of thicknesses, said mounting means of said cutter assembly serving to permit forward deflection of said cutting element by contact upon the edge of a sheet, at the commencement of a scoring operation, and to effect repositioning of said element to a point adjacent the edge, and said rollers serving to effectively break the sheet thereafter.
13 more elements
A manual sheet cutting machine including a cutting head and a support unit therefor;
- said support unit including an elongated base portion comprised of an anvil of generally V-shaped cross-section, and a pair of parallel rigid tubes disposed adjacent thereto;
- and said cutting head comprising:
- A. an elongated body having a handle portion thereon and means for supporting said head for sliding movement on said tubes along a cutting path aligned over said anvil;
- B. a cutter assembly including
- (1) an elongated rocker arm having a head portion adjacent the forward end of said body, said rocker arm being pivotably mounted on said body for movement of said head portion between downwardly extended and upwardly retracted positions,
- (2) a cutting member having a cutting element thereon,
- (3) means for removably mounting said cutting member on said head portion of said rocker arm, said mounting means cooperating with said cutting member to permit slight longitudinal shifting of said cutting element in a forward direction and to bias said cutting member rearwardly against such shifting,
- (4) means for biasing said rocker arm toward said extended position of said head portion, and
- (5) first operating means on said body, accessible from said handle portion thereof and movable in one direction to elevate said rocker arm from said extended position toward said retracted position of said head portion against said biasing means, and movable in another direction to maintain said rocker arm in said extended position against upward deflection;
- and
- C. a breaker assembly including
- (1) a carriage pivotably mounted on said body and having a shaft portion extending transversely thereacross, said carriage being movable between downwardly extended and upwardly retracted positions of said shaft portion,
- (2) a set of rollers rotatably mounted on said shaft portion, and comprising
- (a) a generally cylindrical central roller having a shallow circumferential groove extending about the midsection thereof to define thereon oppositely directed inwardly tapered generally conical sections, and
- (b) a matched pair of outer rollers disposed outwardly of the ends of said central roller, said rollers being of a diameter larger than the maximum diameter of said central roller,
- (3) means for biasing said carriage toward said retracted position of said shaft portion, and
- (4) second operating means on said body, accessible from said handle portion thereof, for forcing said carriage toward said extended position against said biasing means;
- whereby, by suitable selection of said cutting member, said machine can be used for cutting glass, mat, and plastic sheet materials.
15 more elements
Dependencies are inferred from the claim text.