US3384722A - Safety switch lock - Google Patents

Safety switch lock Download PDF

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Publication number
US3384722A
US3384722A US619432A US61943267A US3384722A US 3384722 A US3384722 A US 3384722A US 619432 A US619432 A US 619432A US 61943267 A US61943267 A US 61943267A US 3384722 A US3384722 A US 3384722A
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US
United States
Prior art keywords
locking
slot
closure
actuator
locking bar
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
US619432A
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English (en)
Inventor
Hanke Walter
Klingner Wolfgang
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.)
Olympia Werke AG
Original Assignee
Olympia Werke AG
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 Olympia Werke AG filed Critical Olympia Werke AG
Application granted granted Critical
Publication of US3384722A publication Critical patent/US3384722A/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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/22—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
    • H01H9/226—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts the casing containing electrical equipment other than and operated by the switch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/387—Automatic cut-off devices

Definitions

  • Safety switch locks which interrupt a circuit when a closure is opened, particularly, it is known to provide means for interrupting the circuit of the drive motor of an electric typewriter when the top cover of the typewriter, or of an accounting or other business machine, is opened.
  • the safety locks according to the prior art are rather complicated and consist of a g at many parts so that the cost of manufacture and assembly is high.
  • Another object of the invention is to automatically shift the main switch of an apparatus to a circuit breaking position when a closure is opened.
  • the present invention relates to a safety switch lock having locking means controlled by a closure to lock the main switch of an apparatus in a circuit breaking position when the closure is opened, and to first move the main switch to the circuit breaking position if it is in a circuit making position when the closure is opened.
  • One embodiment of the invention comprises a casing, for example a typewriter casing, having closure means, for example the top cover of a typewriter, movable e tween a first closed position and a second open position; switch means mounted on the housing and having an actuator movable between a first circuit making position and a second circuit breaking position; locking means connected with the closure means for movement therewith to first and second positions and having lost motion coupling means in the form of a pin and slot connection with the actuator; and biasing means for moving the locking means from the second position to a locking position locking the actuator.
  • the actuator remains in the circuit breakingposition when the locking means and closure means move to the second positions, but if the actuator is in the circuit making position, it is coupled by engagement of a pin on the actuator with the end of a slot in the locking means and is moved to the circuit breaking position when the closure is opened.
  • the slot of the locking means has a transverse locking slot portion permitting movement of the locking means to the locking position only if the actuator is in the 3,384,722. Patented May 21, 1968 circuit breaking position, or has been shifted to the circuit breaking position by the locking means.
  • the locking means is an elongated locking member mounted on a pivot means of the housing for longitudinal movement between the first and second positions, and for turning movement between the second and locking positions.
  • FIG. 1 is a fragmentary elevation, partially in section, illustrating a safety switch lock of an electric typewriter in an operational position in which the closure of the typewriter is closed, and the switch is in a circuit breaking position;
  • FIG. 2 is a fragmentary elevation corresponding to FIG. 1, but illustrating the switch in the circuit making position
  • FIG. 3 is a fragmentary elevation corresponding to FIGS. 1 and 2, and illustrating the top cover of the typewriter in an open position, and the switch locks in the circuit breaking position.
  • housing wall 1 carries a fixed pivot passing through an elongated guide slot 3a provided in a slanted end portion of a locking means 3 which has a projection 30 abutting the closure or top cover 5 of the typewriter under the action of a spring 4 which is secured to locking means 3 and to a transverse lug 1a on housing wall 1.
  • closure 5 which is only partially shown, is opened, locking means 3 is urged by spring 4 to follow closure '5 while projection 30 slides on the same until further movement with closure 5 is prevented by the engagement of pivot means 2 with one end of guide slot 3 in the position of FIG. 3.
  • Housing wall 1 carries a cover plate 6 on a pair of brackets 6b which has a slot 60 having an end bounded by an edge 6d.
  • Locking means 3 is a fiat locking bar aligned with slot 6c, but in the positions shown in FIGS. 1 and 2, the end of locking bar 3 slidingly abuts the bottom face of cover plate 6 under the action of spring 4 which tends to turn the locking bar 3 in counterclockwise direction. However, when due to the opening of closure 5, locking bar 3 is moved by spring 4 to the position shown in FIG.
  • a main switch 8 is mounted in the housing of the apparatus and has an actuator including first part 8a having a slot, a second part 10 carrying a coupling pin 11 passing through a slot 3b in the end portion of locking bar 3, a pair of washers 12 and 13 mounted on pin 11 on opposite sides of locking bar 3 and slot 3a, and an adjustment screw 9 which is threaded into part 10 and secures the same with coupling pin 11 to part 8a, permitting adjustment of the length of the actuator and of the position of coupling pin 11 in relation to locking bar 3 and its slot 3b.
  • Slot 3b has a first elongated circular part permitting turning movement of the actuator with coupling pin 11 between the positions shown in FIGS. 1 and 2 while locking bar 3 remains in the same position.
  • This movement is controlled by a manually operated member 7 which has a downwardly projecting operating member 7a having a lower forked end forming an open slot 7b in which a portion of coupling pin 11 is located.
  • the typewriter In the positions shown in FIGS. 1 and 2, the typewriter is in an operative condition, and closure 5 is closed.
  • the manually operated member 7 can be shifted from the position of FIG. 1 in which coupling pin 11 is located at one end of slot 3b and switch 8 is in its circuit breaking position, to the position of FIG. 2 in which coupling pin 11 is located at the other end of slot 3b and the actuator 8a, 10, 11 is shifted to place the switch in the circuit making position.
  • slot 6b has a locking slot portion at one end which extends transverse to the direction of slot 3b.
  • coupling pin 11 is located in the region of the transverse slot portion 3d so that the above-described pivotal movement of locking bar 3 to the position of FIG. 3 located in slot or cutout 60 is possible due to the fact that coupling pin 11 enters the portion 3d. Since pin 11 is located in slot portion 3d, the actuator 8a, 10, 11 cannot turn relative to locking bar 3 which is locked by the edge 6d of cutout 6c.
  • locking bar 3 follows the upward movement of closure 5 under the action of spring 4 until the lower end of guide slot 3a abuts pivot means 2, as shown in FIG. 3.
  • the movement of locking bar 3 is rearward and upward due to the position of guide slot 3a.
  • coupling pin 11 arrives at the right end of guide slot 3b, locking bar 3 is turned about pivot 2 by spring 4 to the locking position shown in FIG.
  • locking bar 3 which is possible due to the fact that the end of locking bar 3 is now located rearwardly of the edge 6d of slot or cutout 6c, and furthermore due to the fact that locking slot portion 3d is now aligned with coupling pin 11.
  • locking bar 3 is locked against movement to the left and to the right, and locking slot portion 3d locks coupling pin 11 and the actuator against turning movement to' the circuit making position.
  • closure 5 When closure 5 is again closed, it engages first projection 30 and displaces the same downward so that locking bar 3 is first turned about pivot 2 in clockwise direction until its end moves out of slot or cutout 6c, and coupling pin 11 is again located in the coupling slot 3b. Further downward movement of closure 5 displaces projection 30 so that locking bar 3 is moved in longitudinal direction toward the right as viewed in FIG. 3 with guide slot 3a moving along the stationary pivot 2, and the end portion of locking bar 3 sliding on the bottom face of cover plate 6 to the position of FIG. 1. The position of the manually operated member 7, and the circuit breaking position of the switch are not changed.
  • closure 5 When closure 5 is closed again, projection 30 is engaged, and locking bar 3 turned in clockwise direction out of slot 6c while coupling pin 11 assumes a position located at the end of the longitudinal coupling slot 60. Further downward movement of closure 5 displaces locking bar 3 to the right until the position of FIG. 1 is again obtained, the manually operable member 7 and the switch remaining in the circuit breaking position until shifted by the operator.
  • coupling slot 3] and coupling pin 11 constitute a lost motion coupling means for coupling locking bar 3 in the position of FIGS. 1 and 2 to the switch actuator for movement toward the left to follow closure 5 toward the open position.
  • the lost motion coupling means 11, 3b permit shifting of the actuator from the circuit breaking position of FIG. 1 to the circuit making position of FIG. 2 by operation of the manually operated member 7.
  • Spring 4 is a biasing means for moving locking bar 3 in longitudinal direction together with the closure 5, and for turning the locking bar in a transverse direction to place coupling pin 11 in the locking slot portion 3d in the locking position of locking bar 3 shown in FIG. 3.
  • Safety switch lock comprising, a casing having closure means movable between a first closed position and a second open position; switch means mounted on said housing and having an actuator movable between a first circuit making position and a second circuit breaking position; locking means connected with said closure means for movement therewith and being a first position when said closure means is in said first position and being in a second position when said closure means is in said second postion, said locking means having lost motion coupling means connected with said actuator so that the same remains in said second position thereof when said locking means and closure means move to said second positions of the same, and so that said actuator in said first position is coupled with said locking means in said first positon of the same and moves to said second position when said locking means moves to said second positions; and biasing means for urging said locking means to a locking position locking said actuator when said locking means and said actuator are both in said second positions so that said actuator is locked in said circuit breaking position when said closure is in said open position.
  • Safety switch lock as claimed in claim 1 comprising mounting means mounting said locking means on said housing for movement in one direction between said first and second positions, and for turning movement in a direction transverse to said one direction between said second and locking positions.
  • Safety switch lock as claimed in claim 2 wherein said mounting means include pivot means secured to said casing, and wherein said locking means has a guide slot receiving said pivot means; and wherein said biasing means urges said locking means into engagement with said closure means so that said locking means in said first position follows said closure means to said second open position and assumes said second position thereof.
  • Safety switch lock as claimed in claim 3 wherein said locking means has a portion engaging said closure means in said first closed position; and wherein said biasing means includes a spring secured to said housing and to said locking means and urging said locking means to said second and locking positions of the same.
  • said lost motion coupling means includes a coupling pin on said actuator and coupling slot in said locking means slidably receiving said coupling pin, said coupling pin being located at first and second ends, respectively, of said coupling slot when said locking means is in said first position, and said actuator is in said first and second positions, respectively, said second end of said coupling slot having a transverse locking slot portion; and wherein said biasing means urge said locking means in said second position to move with said locking slot portion to said locking position in which said coupling pin of said actuator in said second position is located in said locking slot portion and is locked with said actuator so that the same cannot be moved to said first circuit making position.
  • Safety switch lock as claimed in claim 1 wherein said casing is a part of an electric typewriter, and wherein said closure means is the top cover of the typewriter.
  • Safety switch lock as claimed in claim 1 wherein said switch means includes a manually operable member connected with said actuator for movement therewith and being shifted when said actuator is shifted between said circuit breaking and circuit making positions.
  • Safety switch lock as claimed in claim 1 wherein said biasing means urges said locking means to move to said second position, and from said second position to said locking position; and wherein said locking means abuts said casing in said first position and is released by said casing in said second position for movement to said locking position.
  • Safety switch lock as claimed in claim 1 wherein said locking means is a locking bar having a guide slot, and a coupling slot with a transverse locking slot portion; comprising a pivot means on said casing located in said guide slot; wherein said biasing means is a spring connecting said locking bar with said casing and urging said locking bar to follow said closure means to said second open position, and to turn to said locking position; wherein said actuator has a coupling pin located in said coupling slot and forming with the same said lost motion coupling means, said coupling pin being located in said locking slot portion in said locking position of said locking bar; wherein said locking bar has an end portion sliding on said casing in said first position and being released by the same in said second position to abut a casing portion whereby movement of said locking bar in said locking position to said first position is blocked so that movement of said actuator to said first position of the same is blocked.
  • Safety switch lock as claimed in claim 9 wherein said switch means includes a manually operable member connected with said actuator for movement with the same.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)
  • Prostheses (AREA)
US619432A 1966-03-08 1967-02-28 Safety switch lock Expired - Lifetime US3384722A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEO8666U DE1937333U (de) 1966-03-08 1966-03-08 Einschaltsperre fuer kraftangetriebene schreib-, buchungs- oder aehnliche maschinen.

Publications (1)

Publication Number Publication Date
US3384722A true US3384722A (en) 1968-05-21

Family

ID=7351450

Family Applications (1)

Application Number Title Priority Date Filing Date
US619432A Expired - Lifetime US3384722A (en) 1966-03-08 1967-02-28 Safety switch lock

Country Status (6)

Country Link
US (1) US3384722A (enrdf_load_stackoverflow)
CH (1) CH451970A (enrdf_load_stackoverflow)
DE (1) DE1937333U (enrdf_load_stackoverflow)
GB (1) GB1169616A (enrdf_load_stackoverflow)
NL (1) NL6701630A (enrdf_load_stackoverflow)
SE (1) SE329634B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622720A (en) * 1970-08-19 1971-11-23 Scm Corp Calculator keyboard cover interlock with a display cover and switch
US3932716A (en) * 1974-07-15 1976-01-13 Bell Telephone Laboratories, Incorporated Latch and switch actuator interlock safety structure for electronic component module operable during insertion and removal of connector members
US4264793A (en) * 1979-05-24 1981-04-28 Pitney Bowes Inc. Machine door closure safety control apparatus
US4760220A (en) * 1987-06-26 1988-07-26 Eaton Corporation Operator mechanism having reduced handle throw and improved handle lock
US4873404A (en) * 1988-08-17 1989-10-10 Eaton Corporation Low-friction drive link for auxiliary handle operation to molded case circuit breaker connection
US20050252322A1 (en) * 2004-05-14 2005-11-17 Harrington Gregory C Linear cam mechanical interlock
USD904988S1 (en) * 2018-11-29 2020-12-15 Doepke Schaltgerate Gmbh Circuit breaker lock out device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3009001C2 (de) * 1980-03-08 1988-07-28 Adlerwerke Vorm. Heinrich Kleyer Ag, 6000 Frankfurt Abdeckung für den Schreibbereich von Druckern, Schreibmaschinen oder Geräten ähnlicher Art
US4806036A (en) * 1985-11-12 1989-02-21 Genicom Corporation Printer mechanism carried by upper portion of hinged housing
EP0226326A3 (en) * 1985-11-12 1988-06-08 GENICOM Corporation Printer with tractor drive for webs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622720A (en) * 1970-08-19 1971-11-23 Scm Corp Calculator keyboard cover interlock with a display cover and switch
US3932716A (en) * 1974-07-15 1976-01-13 Bell Telephone Laboratories, Incorporated Latch and switch actuator interlock safety structure for electronic component module operable during insertion and removal of connector members
US4264793A (en) * 1979-05-24 1981-04-28 Pitney Bowes Inc. Machine door closure safety control apparatus
US4760220A (en) * 1987-06-26 1988-07-26 Eaton Corporation Operator mechanism having reduced handle throw and improved handle lock
US4873404A (en) * 1988-08-17 1989-10-10 Eaton Corporation Low-friction drive link for auxiliary handle operation to molded case circuit breaker connection
US20050252322A1 (en) * 2004-05-14 2005-11-17 Harrington Gregory C Linear cam mechanical interlock
US7380478B2 (en) * 2004-05-14 2008-06-03 Honeywell International Inc. Linear cam mechanical interlock
USD904988S1 (en) * 2018-11-29 2020-12-15 Doepke Schaltgerate Gmbh Circuit breaker lock out device

Also Published As

Publication number Publication date
GB1169616A (en) 1969-11-05
SE329634B (enrdf_load_stackoverflow) 1970-10-19
NL6701630A (enrdf_load_stackoverflow) 1967-09-11
CH451970A (de) 1968-05-15
DE1937333U (de) 1966-04-28

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