A method of verifying placement of a piece on a work surface is disclosed. An imaging device and an illumination system are electronically interconnected with a computer. The illumination system projects indicia onto a work surface for indicating a location for placement of a piece on the work surface. An indicator is provided to the piece that includes light emission displaying fluorescent wavelengths when illuminated for distinguishing the piece form the work surface. The piece is placed upon the work surface at a location indicated by the laser indicia. The illumination system illuminates the piece presenting a visible contrast between the piece and the work surface enabling the imaging device to distinguish the piece from the work surface. The imaging device signals the controller a location of the piece for the controller to verify accurate placement of the piece.

A method of verifying placement of a piece on a work surface is disclosed. An imaging device and an illumination system are electronically interconnected with a computer. The illumination system projects indicia onto a work surface for indicating a location for placement of a piece on the work surface. An indicator is provided to the piece that includes light emission displaying fluorescent wavelengths when illuminated for distinguishing the piece form the work surface. The piece is placed upon the work surface at a location indicated by the laser indicia. The illumination system illuminates the piece presenting a visible contrast between the piece and the work surface enabling the imaging device to distinguish the piece from the work surface. The imaging device signals the controller a location of the piece for the controller to verify accurate placement of the piece.

A templating tool for templating the dimensions of a kitchen worktop includes a measurement target and an engagement formation for engaging a kitchen unit on which the worktop will be installed. The measurement target is spaced apart from the engagement formation by a predetermined distance such that upon engagement of the kitchen unit by the engagement formation, the measurement target defines a predetermined distance from the unit.

An electric pencil sharpener with delay function includes a motor, a drive assembly, a gear assembly and a cutter assembly. The drive assembly includes a connecting rod, a drive shaft and a start trigger, a stop trigger, and a thrust plate. The connecting rod is moved backward to drive the start trigger to trigger the motor, and synchronously rotated with the cutter assembly; the stop trigger is provided with a teeth structure and a friction structure respectively. The thrust plate is rotated or moved to push against the drive shaft, so that the connecting rod continues to move backwards until the bulge portion engages with the teeth structure, and the ring portion matches with the friction structure, thereby actuating the stop trigger to move to trigger an action of the stop switch of the motor.

A template for assisting in drilling holes in a countertop adjacent to a sink during a water faucet installation process. The template includes at least one plate segment. A bottom surface of the plate segment is configured to overly the countertop. A top surface of the plate segment defines at least one guide bore for guiding a rotary device during the formation of the hole. A drop flange extends downwardly from a front side of the at least one plate segment for engaging an edge of the countertop along the sink. The drop flange is spaced from a center of the at least one guide bore by a first distance in order to allow the hole to be drilled through the countertop along the at least one guide bore at the first distance away from the edge of the countertop.

The present invention discloses a center line planning device, comprising a fixed support, a movable support, said movable support connected to said fixed support in a movable form, the head end of the first connecting rod hinged on the fixed support, the head end of the second connecting rod hinged on the movable support, the tail end of the first connecting rod and the tail end of the second connecting rod hinged together, the length of the first connecting rod equal to the length of the second connecting rod; the hinge position between the tail end of the first connecting rod and the tail end of the second connecting rod provided with a marking tool. The present invention utilizes the principle of coincident median and altitude in an isosceles triangle to design said center line planning device that facilitates workers to identify and confirm the center lines of axial parts, such as square tubes and round tubes, so as to pave the way for further processing of the raw materials.

A carpenter square includes a triangular body having a first edge, a second edge, and a third edge, wherein the first, second, and third edges cooperate to define a perimeter edge of the triangular body. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first position, the fence is normal to the triangular body in a first direction. In the second position, the fence is normal to the triangular body in a second direction opposite the first direction. In the third position, the fence is coplanar to the triangular body.

A carpenter square includes a triangular body having a first edge, a second edge, and a third edge, wherein the first, second, and third edges cooperate to define a perimeter edge of the triangular body. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first position, the fence is normal to the triangular body in a first direction. In the second position, the fence is normal to the triangular body in a second direction opposite the first direction. In the third position, the fence is coplanar to the triangular body.

A projection system includes: a projection device that includes a laser scanner and projects one or more drawings individually onto work spots in a work site; and an adjustment unit configured to adjust at least one of (i) a quantity of the one or more drawings to be simultaneously projected by the projection device or (ii) a setting parameter regarding a mode of projection performed by the projection device.

A carpenter square includes a body including a first, second, and third edges. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first and second positions, the fence is normal to the body. In the third position, the fence is coplanar to the body. A hinge assembly pivots the fence to the body and includes a notch in the body, a recess in the notch, and a tab projecting from the fence and fit over the pin for reciprocating and swinging movement. The tab moves between a neutral stance, in which the tab is mis-registered with the recess and disables movement of the fence among the first, second, and third positions, and an advanced stance, in which the tab is registered with the recess and enables movement of the fence among the first, second, and third positions.