Clamping device

Claim 2

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring member being molded from a synthetic resin, wherein said curved surface of said upper clamping member against which is pressed said arcuate spring member has an arc in cross section having a radius of curvature whose center is slightly eccentrically deviated from the pivotal center of said upper and lower clamping members.

Claim 3

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring member being molded from a synthetic resin, wherein said upper clamping member is provided with a spherically extended portion directed toward said lower clamping member, said spherically extended portion being provided with radially extended grooves; and said lower clamping member is provided with a spherical recess adapted to receive said spherically extended portion of said upper clamping member, said spherical recess being provided with radial ridges and an outlet.

Claim 4

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring member being molded from a synthetic resin, wherein said upper clamping member is provided with a spherically extended portion directed toward said lower clamping member, said spherically extended portion being provided with radially extended grooves; and said lower clamping member is provided with a spherical recess adapted to receive said spherically extended portion of said upper clamping member, said spherical recess being provided with radial ridges and an outlet.

Claim 5

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring member being molded from a synthetic resin, wherein said lower clamping member is enlarged sufficiently enough to serve as an underlying upon which a sheet of paper or the like may be placed, wherein said underlying has a projection formed so as to extend from the undersurface of said underlying, thereby inclining said underlying at a suitable angle when placed upon a horizontal plane, and wherein said arcuate spring member has a T-shaped root and a groove for receiving said T-shaped root of said arcuate spring member is formed in said lower clamping member whereby said arcuate spring member can be detachably fixed to said lower clamping member.

Claim 6

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring member being molded from a synthetic resin, wherein said lower clamping member is enlarged sufficiently enough to serve as an underlying upon which a sheet of paper or the like may be placed, wherein said underlying has a projection formed so as to extend from the undersurface of said underlying, thereby inclining said underlying at a suitable angle when placed upon a horizontal plane, and wherein said arcuate spring member has a T-shaped root and a groove for receiving said T-shaped root of said arcuate spring member is formed in said lower clamping member whereby said arcuate spring member can be detachably fixed to said lower clamping member.

Claim 7

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring Member being molded from a synthetic resin, wherein at both sides of the inner surface at the intermediate portion of said upper clamping member are formed a pair of bearing members while a pair of pivot-supporting members are formed at said lower clamping member in opposed relation with said pair of bearing members, each of said pair of bearing members being provided with a hole formed upon drawing a core, there being a lateral hole for receiving a lateral pivot, stepped portions formed at both sides of said lateral hole and a sloping surface formed upwardly of said lateral hole for guiding said lateral pivot to said lateral hole; and each of said pair of lateral pivot-supporting members is provided with a hole formed upon drawing a core and an arcuate surface formed at the top end thereof.

Claim 8

A clamping device in which an upper clamping member having a rectangular opening and a curved surface is pivotably fixed to a lower clamping member having an arcuate spring member, said arcuate spring member being extended through said rectangular opening in such a manner that the free end of said spring member may be pressed against said curved surface of said upper clamping member, both of said upper and lower clamping members including said spring Member being molded from a synthetic resin, wherein at both sides of the inner surface at the intermediate portion of said upper clamping member are formed a pair of bearing members while a pair of pivot-supporting members are formed at said lower clamping member in opposed relation with said pair of bearing members, each of said pair of bearing members being provided with a hole formed upon drawing a core, there being a lateral hole for receiving a lateral pivot, stepped portions formed at both sides of said lateral hole and a sloping surface formed upwardly of said lateral hole for guiding said lateral pivot to said lateral hole; and each of said pair of lateral pivot-supporting members is provided with a hole formed upon drawing a core and an arcuate surface formed at the top end thereof.

Claim 9

Molds for molding a plastic clamp consisting of a pair of upper and lower clamping members pivotably fixed to each other characterized in that a pair of cavities for molding a pair of bearing members are formed in the female mold of a pair of molds for molding an upper clamping member; a pair of cores are formed in the male mold so as to fit in said cavities respectively with the inner surfaces of said cones being in intimate contact with the inner surfaces of said cavities; an arcuate surface is formed at the leading end of each of said cores so as to be spaced apart from the bottom of said cavity by a predetermined distance, whereby a lateral hole which is the pivotal point between said upper and lower clamping members is molded while a bearing member main body is molded in a mold cavity defined outwardly of the outer surface of said core in said cavity; a pair of molds each having an arcuate recessed surface formed at the leading end thereof are formed on both right and left sides of a male mold of a pair of male and female molds for molding a lower clamping member while a pair of cavities mating with said pair of cores are formed in said female mold in opposed relation with said cores in such a manner that when each of said cores is mated with its mating cavity the inner surface of said core is made in intimate contact with the inner surface of said cavity; the bottom of each of said cavities is arcuated in opposed relation with said arculately recessed surface of said core, thereby defining a mold cavity for molding a lateral pivot while a main body of a pivot supporting member is molded in a mold cavity defined outwardly of the outer surface of said core; and lateral pivots are adapted to be resiliently fitted into said lateral bearing holes of said upper clamping member, to thereby assemble both of said upper and lower clamping members into a unitary construction.

Claim 10

Molds for molding a plastic clamp consisting of a pair of upper and lower clamping members pivotably fixed to each other characterized in that a pair of cavities for molding a pair of bearing members are formed in the female mold of a pair of molds for molding an upper clamping member; a pair of cores are formed in the male mold so as to fit in said cavities respectively with the inner surfaces of said cones being in intimate contact with the inner surfaces of said cavities; an arcuate surface is formed at the leading end of each of said cores so as to be spaced apart from the bottom of said cavity by a predetermined distance, whereby a lateral hole which is the pivotal point between said upper and lower clamping members is molded while a bearing member main body is molded in a mold cavity defined outwardly of the outer surface of said core in said cavity; a pair of molds each having an arcuate recessed surface formed at the leading end thereof are formed on both right and left sides of a male mold of a pair of male and female molds for molding a lower clamping member while a pair of cavities mating with said pair of cores are formed in said female mold in opposed relation with said cores in such a manner that when each of said cores is mated with its mating cavity the inner surface of said core is made in intimate contact with the inner surface of said cavity; the bottom of each of said cavities is arcuated in opposed relation with said arculately recessed surface of said core, thereby defining a mold cavity for molding a lateral pivot while a main body of a pivot supporting member is molded in a mold cavity defined outwardly of the outer surface of said core; and lateral pivots are adapted to be resiliently fitted into said lateral bearing holes of said upper clamping member, to thereby assemble both of said upper and lower clamping members into a unitary construction.