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US 5,690,452 AGranted
Spring loaded automatic plug ejector or hole saws
OwnerDavid G. Baublitsinventor
Life of this patent
Estimating the term…
Abstract
A spring loaded automatic plug ejector for hole saws which utilizes a spring 50 which is increasingly compressed while a hole is being drilled. Once the hole is drilled, the spring 50 decompresses and ejects the plug from the hole saw. The amount of spring tension applied to the plug is adjusted by varying the degree to which the spring is compressed.
Claims26
An automatic plug ejector tool for a hole saw which comprises:
- a mandrel having a proximal end for mounting the tool in a drive means, said mandrel having a distal end for mounting a standard hole saw;
- a bearing means adapted to press against a workpiece when the tool is in use;
- a spring compressible by movement of the bearing means as a hole saw mounted on the mandrel is advanced into a cut;
- and
- retaining means for holding the spring and bearing means generally in an axial relationship on the mandrel, said retaining means further comprising a slide ring moveable along the mandrel and elongated drive pins to engage a hole saw the pins extending between the bearing means and slide ring parallel to the axis of the mandrel,
- whereby when a hole saw mounted on the mandrel is advanced into a cut into a workpiece the bearing means acts against the workpiece surface to compress the spring so that when the saw cuts through the workpiece and removes a cylindrical plug which is contained within the saw the spring relaxes to eject the removed plug from the hole saw.
3 more elements
An automatic plug ejector tool for a hole saw which comprises:
- a mandrel having a proximal end for mounting the tool in a drive means, said mandrel having a distal end for mounting a standard hole saw;
- a slide ring moveable along the mandrel, said ring acting as a stop for the leading end of a spring;
- a spring stop mounted on the mandrel adjacent the proximal end;
- a compressible spring coaxially mounted on the mandrel between the slide ring and spring stop;
- a bearing means adapted to rest against a workpiece;
- elongated hole saw drive pins extending from the bearing means parallel to the axis of the mandrel, said pins being anchored into the slide ring,
- whereby when a hole saw mounted on the mandrel and engaged by the drive pins is advanced into a cut in a workpiece the beating means acts against the workpiece surface and the spring is compressed by the drive pins acting against the slide ring so that when the saw cuts through the workpiece and removes a cylindrical plug which is contained within the saw the spring relaxes to eject the removed plug from the hole saw.
4 more elements
A readily installable and removable automatic plug ejector tool for a hole saw mounted on a mandrel having a pilot drill comprising:
- a collar having an axial aperture to pass a pilot drill;
- collar attachment means to install the tool within a hole saw;
- a bearing holder having a ball bearing adapted to press against a workpiece, the bearing being independently rotatable relative to the bearing holder, said bearing holder and bearing also having an axial aperture sized to pass a pilot drill;
- and
- a coil spring axially positioned against between the bearing holder and the collar and fixed to the bearing and collar, the bearing and collar apertures and spring being aligned along an axis common with the axis of the pilot drill when the tool is installed in a hole saw,
- whereby when the plug ejector tool is installed on a hole saw pilot drill, as the hole saw is advanced to make a cut in a workpiece the bearing acts against the workpiece surface and the spring is compressed so that when the saw cuts through the workpiece and removes a cylindrical plug which is contained within the saw the spring relaxes to eject the removed plug from the hole saw.
3 more elements
Dependencies are inferred from the claim text.