Quinton Instrument Company

Sam Dick Industries, Inc.

Magnadrive Corporation

Bruce D Densmore

John T Rotunda

Lester A Hass

Toby Merrill

Gregory W Fissel

Richard Killen

Jens T Dragoy

John L Brockman

A control system controls a D.C. speed-change motor to change the transmission configurations on a treadmill transmission powered by an A.C. drive motor. The control system may be either microprocessor based or a system of discrete logical pieces. The control system responds to both the current speed of the treadmill belt and the electrical current drawn by the speed-change motor. The control system uses this information to modulate the duty cycle of voltage pulses sent to the D.C. speed-change motor to power the speed-change motor in response to a determination by the control system that the speed-change motor needs to rotate faster or slower to produce a controlled rate of speed change for the treadmill belt. The control system also includes a rapid deceleration system. In response to the user's direction or in response to the condition of the treadmill, the control system sends a high voltage to the D.C. speed change motor to cause it to rapidly change the configuration of the transmission to decelerate the belt.

D.C. treadmill speed change motor controller system

A high speed deceleration device and method is disclosed that operates on a D.C. speed-change motor used to change the transmission configurations on the transmission of a treadmill powered by a constant speed drive motor. In ordinary use, normal transmission acceleration and deceleration rates are used to speed up or slow down the treadmill belt. A deceleration control signal causes a high voltage to be provided to the D.C. speed-change motor. The high voltage causes the D.C. speed-change motor to rapidly change the transmission configurations on the treadmill which causes a rapid deceleration of the treadmill belt. The deceleration control signal is produced in response to a user direction or in response to the condition of the treadmill. Once the belt has been slowed below a threshold speed, the machine shuts itself off. During the deceleration process, the drive motor of the treadmill continues to provide power to the treadmill belt through the transmission so that the transmission continues to move during the deceleration process.

Treadmill deceleration system and method

A control system controls a D.C. speed-change motor to change the transmission configurations on a treadmill transmission powered by an A.C. drive motor. The control system may be either microprocessor based or a system of discrete logical pieces. The control system responds to both the current speed of the treadmill belt and the electrical current drawn by the speed-change motor. The control system uses this information to modulate the duty cycle of voltage pulses sent to the D.C. speed-change motor to power the speed-change motor in response to a determination by the control system that the speed-change motor needs to rotate faster or slower to produce a constant rate of speed change for the treadmill belt. The control system also includes a rapid deceleration system. In response to the user's direction or in response to the condition of the treadmill, the control system sends a high voltage to the D.C. speed change motor to cause it to rapidly change the configuration of the transmission to decelerate the belt.

A compact, economical electrically heated vaporizer having a fast response time and capable of vaporizing liquified petroleum gas at a rate of ten to forty gallons or more per hour with safety and without excessive superheating and/or cracking of the liquified petroleum gas utilizes a metal casting having a closed internal cavity separated into two chambers by an integral barrier. The casting serves as a pressure vessel and heat sink as well as providing a heated interface between electric resistance heaters received in passageways in the barrier and the liquified petroleum gas. The heat generated by the heaters is disseminated uniformly throughout the casting surrounding the chambers. The liquified petroleum gas inlet at one end of the casing connects with the end of one chamber. Multiple small passageways in the barrier at the other end of the casting connect the other end of the one chamber to the adjacent end of the other chamber. The passageways are configured to create a turbulent flow which improves heat transfer. An outlet connects with the other end of the other chamber for discharge of the vaporized gas. The electrical and temperature controls for controlling the operation of the heaters and the flow of liquified petroleum gas through the chambers are housed within an enclosed chamber formed by an end cover on the other end of the casting. The temperature sensors for the temperature controls are received in passageways in the barrier.

Growing community of inventors

Seattle, WA, United States of America

Bruce D Densmore