Drilling apparatus with wall-covering protection
OwnerMichel Giugheseinventor
Life of this patent
Estimating the term…
Abstract
A protective device for a fabric or other soft wall covering upon the drilling of a hole therethrough into a support wall behind the covering has a sleeve which closely surrounds the drill bit, a spring braced against the sleeve and a roller bearing to permit immobilization of the sleeve as the drill bit rotates and is axially displaced in the latter. The sleeve has a circular array of pins projecting from its face turned away from the chuck and adapted to penetrate the wall covering. A light supplementary spring can be provided on this side of the sleeve as well to compress the wall covering.
Claims10
A tool for use in interior decoration for the drilling of a hole in a support covered by a yieldable and tearable covering, the tool comprising:
- a chuck member rotatable about an axis;
- a solid drill bit received coaxially in said chuck member and adapted to bore axially forward into said support and having a front end remote from said chuck member for penetrating axially forward through said covering into said support when pressed axially forward thereagainst while rotating about the axis;
- a covering-protective sleeve member closely surrounding said bit and having a front face turned away from said chuck member a multiplicity of pins projecting axially forward from said face and forming respective axially forwardly directed points distributed uniformly in at least one circle around said bit for piercing said covering, lodging in said support, and holding said sleeve member out of contact with said covering;
- a coil spring surrounding said bit and braced axially between said sleeve member and said chuck member and enabling travel of said bit through said sleeve member with compression of said spring;
- and
- at least one bearing operatively connected between one of said members and said spring to enable rotation of said chuck member and said bit while permitting said sleeve member to be immobilized by said points upon engagement of said covering therewith.
Dependencies are inferred from the claim text.