Robert Boschgmbh

Robert Bosch Tool Corporation

Robert Bosch Power Tools Gmbh

Timothy Szweda

Eric R Laliberte

Brian Taylor

Robert S Doumani

Mark S Talesky

Dieter Volpert

John DeCicco

Gary L Voong

Paul D Hatch

Andrew Frolov

James Dangora

Jan S Koegel

Bharadwaja Maharshi Ramaswamy

Niranjan Sathyanarayanarao Krishnarao

Eric Hendrickson

Jason Feldner

Engin Hassamanci

Gregory Chaganos

Triveni Prabhu

Reshma Hanamanthraddi Neelaraddi

Craig Wilson

Tom Bajek

Jan Koegel

Bharadwaja Marashi Ramaswamy

Gary Voong

An object detection system in a saw includes an electrically conductive plate positioned at a predetermined distance from the implement, a detection circuit comprising a transformer, and a single cable connecting first terminal and second terminals of the transformer. The single cable includes a first conductor electrically connected to the first terminal of the winding and to the electrically conductive plate, a second conductor electrically connected to the implement, and an electrical insulator positioned between the first conductor and the second conductor.

Electrical configuration for object detection system in a saw

In one embodiment, a table saw assembly includes a motor assembly, an electrically conductive belt operably connected to the motor assembly, an arbor shaft operably connected to the belt, a drop arm assembly rotatably supporting the arbor shaft, a first pulley rotatably supporting the belt, the first pulley including an inner component defining an inner bore and an outer component defining an outer surface, the first pulley configured to electrically isolate the inner bore from the outer surface, and an alignment adjustment mechanism operably connected to the first pulley, the alignment adjustment mechanism configured to selectably position the first pulley along an axis of rotation of the first pulley.

Table saw with pulley alignment mechanism

In one embodiment, a table saw assembly includes a motor assembly, an electrically conductive belt operably connected to the motor assembly, an arbor shaft operably connected to the belt, a drop arm assembly rotatably supporting the arbor shaft, and a first pulley rotatably supporting the belt, the first pulley including an inner bore and an outer surface, the first pulley configured to electrically isolate the inner bore from the outer surface.

Table saw with electrically isolated arbor shaft

A method of mounting a capacitive coupling plate to a power tool assembly including a drop arm assembly, an actuating device configured to transfer a force to the drop arm assembly, and a control system configured to control the actuating device includes connecting a capacitive coupling plate bracket formed from a non-conductive material to a drop arm frame of the drop arm assembly, and mounting the capacitive coupling plate to the capacitive coupling plate bracket.

Method of operating a power tool with a protected coupling plate

A method of resetting a drop arm assembly in a power tool assembly from a first drop arm assembly position whereat a portion of a shaping device mounted on the drop arm assembly does not extend above a workpiece support surface, includes removing a throat plate from a throat plate opening, moving at least a portion of a blade wrench downwardly through the throat plate opening, operably coupling the blade wrench with an arbor shaft of a drop arm assembly, releasing a first latch from engagement with a drop arm frame of the drop arm assembly after removing the throat plate, pulling the coupled blade wrench in an upwardly direction to a second drop arm assembly position whereat the portion of the shaping device extends above a workpiece support surface, and latching the drop arm assembly at the second drop arm assembly position with a second latch.

Drop arm reset method

A power tool assembly includes a drop arm assembly movable along a drop plane, an actuating device configured to transfer a force to the drop arm assembly to force the drop arm assembly along the drop plane, and a tool control unit assembly configured to control the power tool assembly, the tool control unit assembly including a printed circuit board (PCB) generally defining a PCB plane which is not perpendicular to the drop plane.

Power tool with protected circuit board orientation

An adjustable stop assembly includes a body, a cam, a lock knob, an adjustable rod, and an adjusting knob. The cam is movable into a locked position in which the hook portion is secured to a rail and an unlocked position in which the hook portion is spaced from the rail. The lock knob is configured to interact with the cam. The adjustable rod extends outward from a first side of the body by a first extension amount and a second side of the body by a second extension amount. The adjusting knob is configured to move the adjustable rod to adjust the first extension amount and the second extension amount. A minor sector portion of the adjusting knob is exposed by an opening in the body while a major sector portion of the adjusting knob is covered by the body at a given instance.

Adjustable stop assembly

A power tool assembly includes a drop arm frame with an opening configured to rotatably support an arbor shaft, a lower surface spaced apart from the opening, and a plurality of ribs extending between the lower surface and the opening. The plurality of ribs define a respective one of a plurality of axes, the plurality of axes intersect at a locus, and the locus is adjacent to, but spaced apart from, a center of gravity of the drop arm assembly. The power tool assembly further includes an actuating device configured to transfer a force to the drop arm assembly when the drop arm assembly is at the first drop arm assembly position, and a control system configured to control the actuating device to transfer the force to the drop arm assembly when an unsafe condition is sensed.

Power tool drop arm with offset ribbing

A method for measuring brush wear in a motor of a saw includes generating, with a sensor connected to a brush in a motor of the saw, a first signal corresponding to a level of wear in the brush and identifying, with a controller, a level of wear for the brush with reference to the first signal. The method further includes generating, with the controller and a user interface device, an output requesting replacement of the brush in response to the identified level of wear exceeding a predetermined threshold.

Diagnostic and maintenance operation for a saw

A power tool assembly includes a latch movable between a first latch position whereat the latch supports a drop arm assembly in a first drop arm assembly position, and a second latch position whereat the latch does not support the drop arm assembly position at the first drop arm assembly position, and an arbor lock movable between a first lock position whereat the arbor lock prevents movement of the drop arm assembly toward the second drop arm assembly position when the drop arm assembly is in the first drop arm assembly position, and a second lock position whereat the arbor lock does not prevent movement of the drop arm assembly toward the second drop arm assembly position when the drop arm assembly is in the first drop arm assembly position.

Power tool with arbor lock

A power tool assembly includes a drop arm assembly movable along a drop path between a first drop arm assembly position whereat a shaping device portion supported by the drop arm assembly extends above a workpiece support surface and a second drop arm assembly position whereat the portion does not extend above the workpiece support surface, the drop arm assembly including a capacitive coupling plate bracket formed from a non-conductive material and connected to a drop arm frame, and a capacitive coupling plate mounted to the capacitive coupling plate bracket, an actuating device configured to transfer a force to the drop arm assembly when the drop arm assembly is at the first drop arm assembly position, and a control system operably connected to the capacitive coupling plate and configured to control the actuating device to transfer the force to the drop arm assembly when an unsafe condition is sensed.

Power tool with protected coupling plate

A table saw includes a safety system to protect a user from injury. The safety system detects a sensed condition and rapidly moves a saw blade away from the user. The safety system includes a dual ratchet mechanism to prevent the blade from rebounding back above a work surface after an initial rapid retraction of the blade. The table saw has a swing arm that rotates to move the blade below the work surface. A first ratchet engages a first contact surface of the swing arm after rotation of the swing arm over a first range of angular displacements to prevent counter rotation of the swing arm. A second ratchet engages a second contact surface of the swing arm after rotation of the swing arm over a second range of angular displacements to prevent counter rotation of the swing arm.

Ratchet and release mechanism for swing arm of table saw

A user interface device for a saw is mounted to an exterior of a housing in the saw. The user interface device includes a light emitting diode (LED) mounted on a printed circuit board (PCB), an antenna formed on the PCB, an optically opaque member with a first opening and a second opening, the first opening aligned with the LED, an optically translucent member engaging the second opening of the optically opaque member, and a base member connected to the PCB, optically opaque member, and optically translucent member, the base member being configured to be mounted to an exterior of a housing of the saw.

User interface system in a table saw

A power tool assembly includes a drop arm assembly including a drop arm frame and an arbor shaft configured to support a shaping device at least partially above a workpiece support surface, the drop arm assembly configured to move within a drop plane to drop the shaping device completely beneath the workpiece support surface, a belt operably connected to the arbor shaft and configured to rotate the arbor shaft through a slave pulley, the slave pulley having a slave pulley axis of rotation, a motor including a power shaft operably connected to the belt through a motor end pulley, the motor end pulley having a motor end pulley axis of rotation, and an orbit bracket configured to orbitally support the drop arm assembly, the orbit bracket defining a drop arm orbit axis located between the motor end pulley axis of rotation and the slave pulley axis of rotation.

Growing community of inventors

Chicago, IL, United States of America

Timothy Szweda