US5212433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Robot emergency stop circuit
Assignee: Fanuc Corp
•
Filing: 1990-12-11
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Granted: 1993-05-18
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Expires: 2010-12-11
Abstract
Abstract A robot emergency stop circuit for bringing the robot to an emergency stop through a deadman switch installed on a teaching control device while the robot is being taught behavior patterns through the teaching control device. The deadman switch (DM1) causes the robot to operate according to commands received from the teaching control device as long as a pressure applied by a finger remains within a specified range. When the finger pressure becomes lower or higher than the specified range, a magnet switch in a servo amplifier (2) is turned OFF, bringing the robot to an emergency stop. Accordingly, if the robot should unexpectedly move, causing an operator to take an unintended action such as flinging the teaching control device away or holding it tightly, and thus apply an abnormal pressure to the deadman switch (DM1), then the contact point of the deadman switch (DM1) is shifted from the middle point of three contact points, thus turning the switch OFF. Accordingly, the robot can be stopped even if the operator takes an unintended action when a hazardous situation occurs.
Inventors
- 👤 Shimoda Yasuyuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:55
CPC Classifications
B; B25; B25J; B25J9/00; B25J9/16; B25J9/1674; B25J13/00; B25J13/02; B25J19/00; B25J19/06; H; H01; H01H; H01H2300/00; H01H2300/026; H01H2300/028; H01H9/00; H01H9/02; H01H9/0214
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
A robot emergency stop circuit for bringing a robot being supplied power to an emergency stop while said robot is being taught behavior patterns using a teaching control device issuing instructions, said robot emergency stop circuit comprising: a deadman switch connected to the teaching control device, said deadman switch including: a 3-position contact switch having first, second and third contact positions; and a conductive element contractual with said first, second and third contact positions responsive to pressure applied to said deadman switch, said deadman switch supplying said robot with the power in response to the pressure applied by a user enabling the robot to receive the instructions and operate in accordance with the instructions issued by said teaching control device when the pressure applied by the user remains within a specified range connecting said conductive element to said second contact position and connecting the power supply to the robot, and said deadman switch stopping the supplying of the power to said robot when the pressure applied by the user becomes one of lower than said specified range connecting said conductive element to said first contact position and higher than said specified range connecting said conductive element to said third contact position, disconnecting the power supply from the robot.
Claim 2
Dependent Claim
208 words
A robot emergency stop circuit for bringing a robot being supplied power to an emergency stop while said robot is being taught behavior patterns using a teaching control device issuing instructions, said robot emergency stop circuit comprising: a deadman switch connected to the teaching control device, said deadman switch including: a 3-position contact switch having first, second and third contact positions; and a conductive element contractual with said first, second and third contact positions responsive to pressure applied to said deadman switch, said deadman switch supplying said robot with the power in response to the pressure applied by a user enabling the robot to receive the instructions and operate in accordance with the instructions issued by said teaching control device when the pressure applied by the user remains within a specified range connecting said conductive element to said second contact position and connecting the power supply to the robot, and said deadman switch stopping the supplying of the power to said robot when the pressure applied by the user becomes one of lower than said specified range connecting said conductive element to said first contact position and higher than said specified range connecting said conductive element to said third contact position, disconnecting the power supply from the robot.
Claim 3
Dependent Claim
58 words
A robot emergency stop circuit according to claim 1, further comprising a switch connected to and denergizing said deadman switch, and wherein when said deadman switch is deenergized by said switch, the robot will not stop even when the pressure applied by the user to said deadman switch is one of lower and higher than the specified range.
Claim 4
Dependent Claim
48 words
A robot emergency stop circuit according to claim 1, further comprising a switch connected to said deadman switch, and wherein when said deadman switch is placed in an off condition by the user, said switch is activated for maintaining the off condition until said deadman switch is reset.
Claim 5
Dependent Claim
27 words
A robot emergency stop circuit according to claim 1, wherein said deadman switch is pressure biased to place said conductive element in connection with said first position.
References Cited (Backward Citations)
US3814886A
Cited
US4095072A
Cited
US4097704A
Cited
US4100383A
Cited
US4206333A
Cited
US4737697A
Cited
US4990729A
Cited
US4903318A
Cited
US4820889A
Cited
US4878000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |