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US4557660A Expired / Lapsed US ⏱️ 0.0 years remaining

Robot hand

Assignee: Fanuc Corp
•
Filing: 1983-12-06
•
Granted: 1985-12-10
•
Expires: 2003-12-06
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Abstract

Abstract A robot hand provided with fingers driven by a double acting cylinder and supplied working liquid pressure through two, 2-position, 5-port-type, single solenoid, electromagnetic valves, wherein: (a) an outlet of a first electromagnetic valve is connected with the inlet thereof in response to the ON position of the solenoid thereof and is connected with the inlet of a first chamber of the double acting cylinder; (b) an outlet of a second electromagnetic valve is connected with the inlet thereof in response to the OFF position of a second chamber of the double acting cylinder; (c) an outlet of the first electromagnetic valve is connected with the inlet thereof in response to the OFF position of the solenoid thereof and is plugged; (d) an outlet of the second electromagnetic valve is connected with the inlet thereof in response to the ON position of the solenoid thereof and is plugged; and (e) a working liquid pressure source is connected with the inlet of the first and second electromagnetic valves. This robot hand is capable of maintaining an object in a held position even in the event of an electric power supply failure.

Inventors

  • 👤 Seiichiro Nakashima
  • 👤 Nobutoshi Torii
  • 👤 Masayuki Hamura

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 00:10
CPC Classifications
B; B25; B25J; B25J15/00; B25J15/02; B25J15/0253; B25J15/0266; B25J15/0273; B25J9/00; B25J9/10; B25J9/14

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 216 words
A robot hand, comprising: (a) a plurality of fingers; (b) a double acting cylinder which drives said plurality of fingers; (c) a first, 2-position, 5-port-type, single solenoid, electromagnetic valve, including-- (i) a first outlet which is connected with an inlet of the first valve in response to an ON position of the solenoid of the first valve and which is connected with an inlet of a first chamber of said double acting cylinder, the inlet of the first valve being connected with a working liquid pressure source, and (ii) a second outlet which is connected with the inlet of the first valve in response to an OFF position of the solenoid and which is plugged; and (d) a second, 2-position, 5-port-type, single solenoid, electromagnetic valve, including-- (i) a first outlet which is connected with an inlet of the second valve in response to an OFF position of the solenoid of the second valve and which is connected with an inlet of a second chamber of said double acting cylinder, the inlet of the second valve being connected with the working liquid pressure source, and (ii) a second outlet which is connected with the first inlet of the second valve in response to an ON position of the solenoid of the second valve and which is plugged.
Claim 2
Dependent Claim 216 words
A robot hand, comprising: (a) a plurality of fingers; (b) a double acting cylinder which drives said plurality of fingers; (c) a first, 2-position, 5-port-type, single solenoid, electromagnetic valve, including-- (i) a first outlet which is connected with an inlet of the first valve in response to an ON position of the solenoid of the first valve and which is connected with an inlet of a first chamber of said double acting cylinder, the inlet of the first valve being connected with a working liquid pressure source, and (ii) a second outlet which is connected with the inlet of the first valve in response to an OFF position of the solenoid and which is plugged; and (d) a second, 2-position, 5-port-type, single solenoid, electromagnetic valve, including-- (i) a first outlet which is connected with an inlet of the second valve in response to an OFF position of the solenoid of the second valve and which is connected with an inlet of a second chamber of said double acting cylinder, the inlet of the second valve being connected with the working liquid pressure source, and (ii) a second outlet which is connected with the first inlet of the second valve in response to an ON position of the solenoid of the second valve and which is plugged.

References Cited (Backward Citations)

JPS54131255A Cited
US4336926A Cited
WO1982001156A1 Cited
US4348044A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-12-09 1989-06-10 1989-12-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-12-09 1993-06-10 1993-12-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-12-09 1997-06-10 1997-12-10 $7700.00 Window Closed / Lapsed

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