Router attachment

A biscuit joiner, comprising:

• a router;
• a flat plate member attached to the bottom of the router;
• a base member defining a substantially flat front surface for abutting the face of a workpiece into which a slot is to be cut and having a top surface and defining a central opening in its top surface extending through the flat front surface;
• cooperating means on said flat plate and said base member for mounting the flat plate on the base member to limit motion of the flat plate relative to the base member to a line perpendicular to the flat front surface;
• and
• a bit rotatably mounted on said router, said bit having substantially the same thickness as a standard biscuit so that, when plunged into a workpiece, said bit cuts a slot which will receive approximately one-half of a standard biscuit.

A router attachment for cutting into a surface of a workpiece, comprising:

• a substantially flat plate adapted to be fixed to the bottom of a router and to rest on the top surface of the workpiece for aligning the router with the workpiece both before and during cutting;
• a base member defining a substantially flat front surface for abutting the face of the workpiece into which the cut is to be made both before and during cutting and having a top surface and defining a central opening in its top surface extending through the flat front surface, said central opening being large enough to receive a router bit;
• and
• cooperating means on said substantially flat plate and said base member for mounting the flat plate on the base member to limit motion of the flat plate relative to said base member to a line perpendicular to said flat front surface so that said flat plate can start at a beginning position in contact with the top surface of the workpiece and then move along the top surface of the workpiece to control the height of the cut while permitting the router bit to plunge into the face of the workpiece, while the base member remains in fixed contact with the face of the workpiece,
• wherein said cooperating means on said flat plate member and said base member for slidably mounting the flat plate on the base member comprises a pair of elongated ridges on one of said members and a cooperating pair of elongated grooves defined in the other of said members adapted to receive said elongated ridges, wherein said elongated grooves and ridges lie perpendicular to said flat front surface.

A router attachment for cutting into a surface of a workpiece, comprising:

• a substantially flat plate adapted to be fixed to the bottom of a router and to rest on the to surface of the workpiece for aligning the router with the workpiece both before and during cutting;
• a base ember defining a substantially flat front surface for abutting the face of the workpiece into which the cut is to be made both before and during cutting and having a top surface and defining a central opening in its top surface extending through the flat front surface, said central opening being large enough to receive a router bit;
• cooperating means on said substantially flat plate and said base member for mounting the flat plate on the base member to limit motion of the flat plate relative to said base member to a line perpendicular to said flat front surface so that said flat plate can start at a beginning position in contact with the top surface of the workpiece and then move along the top surface of the workpiece to control the height of the cut while permitting the router bit to plunge into the face of the workpiece, while the base member remains in fixed contact with the face of the workpiece;
• and
• wherein said base member and said flat plate define adapter holes for mounting adapters to be used for supporting small workpieces.

A router attachment for cutting into a surface of a workpiece for cutting a slot to receive a biscuit for biscuit joinery, comprising:

• a substantially flat plate defining a plurality of holes therethrough which can be aligned with holes in the bottom of a router for receiving fasteners for attaching the flat plate to the router, said flat plate being adapted to rest on the top surface of the workpiece for aligning the router with the workpiece both before and during cutting;
• a base member defining a substantially flat front surface for abutting the face of the workpiece into which the cut is to be made both before and during cutting and having a top surface and defining a central opening in its top surface extending through the flat front surface, said central opening being large enough to receive a router bit;
• and
• cooperating means on said substantially flat plate and said base member for mounting the flat plate on the base member to limit motion of the flat plate relative to said base member to a line perpendicular to said flat front surface so that said flat plate can start at a beginning position in contact with the top surface of the workpiece and then move along the top surface of the workpiece to control the height of the cut while permitting the router bit to plunge into the face of the workpiece, while the base member remains in fixed contact with the face of the workpiece.