FR688835A - Safety device for structural extraction wells - Google Patents

Safety device for structural extraction wells

Info

Publication number
FR688835A
FR688835A FR688835DA FR688835A FR 688835 A FR688835 A FR 688835A FR 688835D A FR688835D A FR 688835DA FR 688835 A FR688835 A FR 688835A
Authority
FR
France
Prior art keywords
safety device
extraction wells
structural
structural extraction
wells
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Heinrich Zuscher
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR688835A publication Critical patent/FR688835A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/02—Door or gate operation
    • B66B13/14—Control systems or devices
    • B66B13/16—Door or gate locking devices controlled or primarily controlled by condition of cage, e.g. movement or position
    • B66B13/18—Door or gate locking devices controlled or primarily controlled by condition of cage, e.g. movement or position without manually-operable devices for completing locking or unlocking of doors

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
FR688835D 1929-02-04 1930-01-25 Safety device for structural extraction wells Expired FR688835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE688835X 1929-02-04

Publications (1)

Publication Number Publication Date
FR688835A true FR688835A (en) 1930-08-29

Family

ID=6598579

Family Applications (1)

Application Number Title Priority Date Filing Date
FR688835D Expired FR688835A (en) 1929-02-04 1930-01-25 Safety device for structural extraction wells

Country Status (1)

Country Link
FR (1) FR688835A (en)

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