US3035130A - Safety device for appliances which perform successive programmed operations - Google Patents

Safety device for appliances which perform successive programmed operations Download PDF

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Publication number
US3035130A
US3035130A US833282A US83328259A US3035130A US 3035130 A US3035130 A US 3035130A US 833282 A US833282 A US 833282A US 83328259 A US83328259 A US 83328259A US 3035130 A US3035130 A US 3035130A
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US
United States
Prior art keywords
safety device
appliance
abutments
abutment
appliances
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 - Lifetime
Application number
US833282A
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English (en)
Inventor
Dachkevitch Vsevolod
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Application granted granted Critical
Publication of US3035130A publication Critical patent/US3035130A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/24—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a non-rotatable moving part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B7/00—Automatic or semi-automatic turning-machines with a single working-spindle, e.g. controlled by cams; Equipment therefor; Features common to automatic and semi-automatic turning-machines with one or more working-spindles
    • B23B7/02—Automatic or semi-automatic machines for turning of stock
    • B23B7/10—Accessories, e.g. guards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C15/00—Safety gear
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/06—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using cams, discs, rods, drums or the like
    • G05B19/063—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using cams, discs, rods, drums or the like for sequential programme-control without delivering a reference value
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G15/00—Mechanical devices for initiating a movement automatically due to a specific cause
    • G05G15/04—Mechanical devices for initiating a movement automatically due to a specific cause due to distance or angle travelled by a member
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G21/00—Mechanical apparatus for control of a series of operations, i.e. programme control, e.g. involving a set of cams
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F7/00—Shielded cells or rooms
    • G21F7/06—Structural combination with remotely-controlled apparatus, e.g. with manipulators
    • G21F7/065—Remotely manipulated machinery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/14—Operating parts, e.g. turn knob
    • H01H19/18—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H19/186—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift with travelling nuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/084—Protection measures

Definitions

  • the present invention relates to a safety device which may be iitted to appliances which perform successive and programmed operations.
  • the device to which the invention relates may be used in particular to ensure safety in working an automatically or semi-automatically controlled handling machine. For example, it will prevent the load from colliding with an obstacle (door, cover of a receptacle etc.) which may not have been withdrawn for any reason, from reaching or passing a dangerous position if the normal supervisory members are not working, or of starting a movement before the movement in progress has been finished.
  • an obstacle door, cover of a receptacle etc.
  • a safety device for appliances which perform successive programmed operations characterised in that it comprises a combination, in a frame, of a cursor which is movable along a definite trajectory in synchronism with the motor of the appliance, a movable abutment holder comprising one or more abutments suitably situated on the holder and capable of being withdrawn or brought into the path of the slider, the said holder normally occupying a position which allows the appliance to work, and being movable to a position, under the action of thrust by the cursor on any of the abutments during operations, which stops the appliance, and means for bringing the abutments into the active position or for causing them to be withdrawn, as a function of the operations in the programme which they are supervising.
  • the safety device to which the invention relates thus operates as follows:
  • the abutment holder must be put back into place in order to re-establish the initial conditions, so that the appliance may be started up again after the mistake which was made has been corrected, or the cause of nonworking which occasioned stoppage has been eliminated.
  • the trajectory of the cursor and the position and number of the abutments must be determined as a function, on the one hand, of the programmes of operations which the appliance can perform, and on the other hand of the "ice conditions under which it is desired to have the said operations proceed.
  • the safety device thus forms a unit which represents in analogical form the working of the appliance which it is desired to supervise; in this analogica] unit the position of the cursor represents the state to which the cycle of the appliance has advanced, each abutment a safety means which can stop the appliance, and the position of each abutment the instant on the cycle at which this event may occur.
  • the safety device exhibits the following features, taken separately or in various combinations:
  • the cursor is a guided nut, rotationally locked and displaced in one direction or the other by a screw which is itself driven by the motor of the appliance by means of a suitable transmission.
  • the movable abutment holder consists of a cross-member which can slide in both directions on supports provided on the framework on either side of a suitably marked position of balance. Displacement of the said member with respect to the said position, as soon as a certain ⁇ amplitude is reached, suddenly frees a switch interposed in the power-supply circuit of the electric motor of the appliance.
  • the movable cross-member' is equipped with fixed stroke-terminating abutments.
  • the abutments which are normally disposed in the path of ⁇ the cursor under the action of their own weight or of springs, are withdrawn by electromagnets which are energised either under the control of a selector or control change-over switch in the appliance, or by circuits being closed due to performance of the operations to be supervised.
  • This embodiment is particularly suitable for a safety device iitted to a handling machine which performs reciprocating movements starting from a parked position.
  • the cursor likewise moves in one direction or the other according to the direction in which the handling machine moves.
  • FIGURE 2 illustrates a transverse section through the same device along AA in FIGURE l;
  • FIGURE 3 illustrates a transverse section through the same device along BB in FIGURE 1;
  • FIGURE 4 is a detailed illustration on a larger scale, being a longitudinal section through the members which position the movable cross-member on the framework;
  • FIGURE 5 is a detailed illustration on a larger scale, being a longitudinal section through the members of the movable cross-member which serve as an abutmentholder and to stop the appliance.
  • the framework of the device to which the invention relates (FIGURES 1 to 3) consists of two horizontal frames 1 made of profiled members joined by two vertical cheeks 2.
  • the said framework supports the cross-member 3 which is capable of translational movement along its longitudinal dimension (as explained later), and serves as [an abutment-holder.
  • the nut 4, which is moved by the screw 5 rotating in the bearings 6 in the cheeks 2, is guided by a bar 7 fixed in the bores 8 in the cheeks 2.
  • a sprocket 9 intended to actuate the screw 5 is keyed to the end thereof; it is connected by a chain 41 to the driving motor 39' of the ⁇ appliance 40 which it is desired to supervise.
  • the movable cross-member 3 rests on the framework 1 by way of the bearing plates and 11 which have machined surfaces and are attached to the cheeks 2, and similar plates 12 and 13 attached to the movable cross-member.
  • the bearing plate 10 (FIGURE 4) comprises a channel 14, while the plate 12 on the cross-member is equipped with a catch 15 which engages in the channel 14 and thus determines the normal position of the movable cross-member 3.
  • the latter has button-holes 16 through which there pass rods 17 (FIG- URES l and 3) fast with the framework 1.
  • the movable cross-member 3 holds the retractable abutments 18, 19, 20, whereof one, the ⁇ abutment 19, is illustrated in the active position, and the other two, the abutments 18 and 20, in the inactive position. These abutments are attached to the rods 21 which are rigidly connected to the cores of the electromagnets 22, the latter being attached to the movable cross-member 3. The rods 21 are guided in the bores in the plates 23 attached to the lower face of the movable cross-member.
  • the retractable abutments 18, 19, are controlled by Way of the electrical connections 42 as the cycle of the appliance 40 proceeds.
  • the movable cross-member 3 is likewise fitted with stroke-terminating abutments 24 which are attached by way of holders 25.
  • the position of the abutments 18, I9 and 20 with respect to the rods 21, and of ⁇ the abutments 24 with respect to the holders 25, is adjustable in order to give a slight variation of the position at which the nut 4 on the screw 5 cornes into contact with each abutment while it is being displaced in one or the other direction.
  • An abutment is adjusted by screwing it up or unscrewing it in the threads, not illustrated, with which the rods 21 or the holders 25 are provided for this purpose.
  • the movable cross-member 3 has a vertical abutment 26 (FIGURES l and 5) on its upper face.
  • the abutment 26 is situated at one end of the crossmember, but this position is not absolutely necessary.
  • a rod 27 (FIGURES l and 5), whereof the end is of the same width as the abutment 26, bears against the latter.
  • the rod 27 is guided ⁇ in the bores in the plate 28 supporting the switch 29 on the one hand, and in the plate 30 supported by a column 31 bearing on the plate 28 on the other hand.
  • the rod 27 is caused to bear against the abutment 26 by a spring 32 compressed between the plate 30 and an adjustable ring 33 on the rod 27.
  • a lever 34 engages at one end in a button-hole in the upper part of the rod 27. This lever is supported by way of a spindle by the cap 3S mounted on the co-lumn 31. The other end of the lever 34 is connected by way of a link 36, articulated about the spindles 37, to the counterweight 38 of the switch 29.
  • the nut 4 moving to the left cannot go appreciably beyond the position marked by the abutment 24 without pushing the movable cross-member 3 to the left, and automatically stopping the appliance 40 as before.
  • the rod 27 In order to allow ⁇ the appliance 40 to start working again ⁇ after having been stopped by the safety device, the rod 27 must be lifted abo-ve the abutment 26, the nut 4 must be freed from the abutment which it pushed back when it lifted, and the movable cross-member 3 must be manually returned to its normal position which is marked by engagement of the catch 15 in the channel 14.
  • the safety device which has thus been described uses members, chiefly of mechanical type, which are simple to construct and fit up, and moreover do not require any accurate machining.
  • a safety device for an appliance driving means for the appliance, a frame, a screw mounted for rotation in said frame, said driving means rotating said screw, a guide bar on said frame parallel to said screw, a cross member extending the width of said frame mounted for limited movement parallel to said screw on said frame, a switch for said driving means mounted on said frame, a nut mounted on said screw for movement therealong, said nut slidably engaging said guide bar, at least one abutment mounted on said cross member for engagement by said nut, each of said abutments comprising a holder secured to said cross member and a stud threaded through said holder and extending parallel to said screw in the path of said nut, and means actuated by movement of said cross member for opening said switch.
  • solenoid actuated means for selectively retracting said abutments out of engagement by said nut.
  • a boss on said Cross member, and said means for opening said switch including a switch arm for said switch, a counterweight on said switch arm, a lever and link for moving said switch arm, and a rod resiliently biased into engagement with said boss and articulated to said lever.
  • each of said means including an electromagnet mounted on said cross member and a holder of magnetic material mounted for movement in said cross member for actuation by said electro-magnet.
  • said driving means being an electric motor
  • said switch being connected into the electric circuit for said electric motor whereby when said switch is open said motor is de-energized.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Catching Or Destruction (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US833282A 1958-08-27 1959-08-12 Safety device for appliances which perform successive programmed operations Expired - Lifetime US3035130A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1213541T 1958-08-27

Publications (1)

Publication Number Publication Date
US3035130A true US3035130A (en) 1962-05-15

Family

ID=9676584

Family Applications (1)

Application Number Title Priority Date Filing Date
US833282A Expired - Lifetime US3035130A (en) 1958-08-27 1959-08-12 Safety device for appliances which perform successive programmed operations

Country Status (5)

Country Link
US (1) US3035130A (enrdf_load_stackoverflow)
CH (1) CH357226A (enrdf_load_stackoverflow)
FR (1) FR1213541A (enrdf_load_stackoverflow)
GB (1) GB882402A (enrdf_load_stackoverflow)
LU (1) LU37566A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146642A (en) * 1959-02-14 1964-09-01 Kralowetz Bruno Forging machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146642A (en) * 1959-02-14 1964-09-01 Kralowetz Bruno Forging machine

Also Published As

Publication number Publication date
GB882402A (en) 1961-11-15
LU37566A1 (enrdf_load_stackoverflow)
CH357226A (fr) 1961-09-30
FR1213541A (fr) 1960-04-01

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