Magnetic holding device
AssigneeK & F Manufacturing Co., Inc.
InventorTheodore D. Wright
Life of this patent
Estimating the term…
Abstract
A permanent magnet holding plate comprises a thin base sheet of stiff, nonmagnetic material with a multiplicity of pole pieces made of strips of magnetic material extending across the base plate but separated from one another, and strips of compressible permanent magnet material located in the spaces between the pole pieces and in intimate contact therewith and polarized to induce magnetic poles of opposite polarity in successive pole pieces. In a preferred embodiment, the base plate is curved to form a magnetic holding saddle and the pole pieces and permanent magnet strips are transverse to the curvature of the plate.
Claims10
A magnetic device for holding a printing plate or the like comprising:
- a base plate made of rigid, substantially non-magnetic material, said base plate exhibiting an arcuately curved outer surface,
- a plurality of spaced-apart rigid strips of magnetic material arranged at the outer surface of the base plate,
- magnet strips located in respective spaces between said rigid strips, and
- mechanical locking means for holding said rigid strips and said magnet strips in position at said base plate, said locking means including recess means at said base plate which are lockingly engageable over the respective extreme axial end portions of said rigid strips and said magnet strips to hold said strips against movement both radially outwardly of said base plate and axially in the direction of said strips.
A magnetic device for holding a printing plate or the like comprising:
- a base plate made of rigid, substantially nonmagnetic material, said base plate exhibiting an arcuately curved outer surface,
- a plurality of spaced-apart rigid strips of magnetic material arranged at the outer surface of the base plate and extending transverse to the direction of curvature of said base plate, and
- compressible magnet strips located in respective spaces between said rigid strips, said compressible magnet strips making intimate side-to-side contact with their adjacent rigid strips and being arranged so that the same magnetic pole is located at opposite sides of each rigid strip to form successive rigid strips and to magnetically induce pole pieces of opposite polarity, said compressible magnet strips being slightly tapered along their sides to insure good intimate contact with adjacent rigid strips.
A magnetic device for holding a printing plate or the like comprising:
- a base plate made of rigid, substantially non-magnetic material, said base plate exhibiting an arcuately curved outer surface,
- a plurality of spaced-apart rigid strips of magnetic material arranged at the outer surface of the base plate and extending transverse to the direction of curvature of said base plate, and
- compressible magnet strips located in respective spaces between said rigid strips, said compressible magnet strips making intimate side-to-side contact with their adjacent rigid strips and being arranged so that the same magnetic pole is located at opposite sides of each rigid strip to form successive rigid strips into magnetically induced pole pieces of opposite polarity,
- wherein said compressible magnet strips and said rigid strips are disposed and configured on said base plate to effect a greater magnetic field concentration in respective areas of said device which in use are engageable with end portions of the printing plate than in areas intermediate said end portions of the printing plate.
Dependencies are inferred from the claim text.