Electric screwdriver
First Claim
Patent Images
1. An electric screwdriver comprising:
- a universal motor;
phase-gating controller means;
first connection means connecting said phase-gating controller means and said universal motor;
wave-packet controller means; and
second connection means connecting said wave-packet controller means and said phase-gating controller means.
1 Assignment
0 Petitions
Accused Products
Abstract
A universal motor which operates an electric tool is controlled by a phase-gating controller for determining variable rotational speeds. The phase-gating controller can be switched over to wave-packet-controlled phase-gating control mode in order to be able to switch over between a continuous speed-torque characteristic and pulsating operation.
-
Citations
13 Claims
-
1. An electric screwdriver comprising:
-
a universal motor; phase-gating controller means; first connection means connecting said phase-gating controller means and said universal motor; wave-packet controller means; and second connection means connecting said wave-packet controller means and said phase-gating controller means. - View Dependent Claims (2, 3)
-
-
4. An electric screwdriver comprising:
-
a universal motor; and phase-gating controller means for determining variable rotational speed of said universal motor, with said phase-gating controller means capable of a wave-packet controlled phase-gating control mode and with said wave-packet controlled phase-gating control mode capable of controlling said universal motor for a jerky rotational speed in a range of speed which extends to the point of standstill. - View Dependent Claims (5, 6, 7, 8, 9)
-
-
10. An electric screwdriver comprising:
-
a universal motor; and phase-gating controller means for determining variable rotational speed of said universal motor, with said phase-gating controller means capable of a wave-packet controlled phase-gating control mode and with said wave-packet controlled phase-gating control mode capable of controlling said universal motor for a jerky rotational speed; with said phase-gating controller means comprising; a triac; integrated circuit means with said integrated circuit means connected to said triac for the purpose of starting said triac, with said integrated circuit means having an enable terminal; oscillator means, with said oscillator means having oscillator output means, with said oscillator output means connected to said enable terminal of said integrated circuit means;
said oscillator means comprising;a first actuator means; and a second actuator means with said first actuator means determining the drive frequency of said integrated circuit means in said phase-gating controller means and with said second actuator means determining the pulse width of the drive frequency of said integrated circuit means in said phase-gating controller means. - View Dependent Claims (11, 12, 13)
-
Specification