Back to results
US 3,937,239 AGranted
Time delay mechanism for pencil sharpener
AssigneeKetcham & McDougall, Inc.
InventorJames M. Bosland
Life of this patent
Estimating the term…
Abstract
A time delay mechanism positioned in the pencil sharpener housing near the entry point of the pencil delays the entry of the pencil into the sharpening cavity and simultaneously moves the helical cutting mechanism inwardly into engagement with a leaf spring contact thereby causing actuation of the pencil sharpener motor and rotation of the helical cutting mechanism before the entry of the pencil point into the sharpening cavity.
Claims10
Apparatus for automatically sharpening a pencil comprising:
- a sharpener housing having an outer end corresponding to the entry point of the pencil to be sharpened and an inner end,
- an electric motor being positioned within said housing adjacent said housing inner end,
- means for cutting the pencil, said cutting means being positioned within said sharpener housing between said electric motor and said sharpener housing inner end,
- a first electrical contact bein electrically connected to said motor and being positioned between said motor and said cutting means,
- a second electrical contact being adjacent to and spaced from said first electrical contact and being positioned between said motor and said cutting means, said cutting means being axially movable into engagement with said second electrical contact,
- means positioned adjacent the outer end of said housing for frictionally engaging the pencil to be sharpened, said frictionally engaging means being axially movable within said housing into engagement with said cutting means
- whereby insertion of the pencil into said frictionally engaging means causes axial movement of said engaging means, said cutting means and said second electrical contact thereby closing said normally separated electrical contacts and actuating said electrical motor.
4 more elements
Dependencies are inferred from the claim text.