US2890782A - Adjusting device for spring-loaded key levers - Google Patents

Adjusting device for spring-loaded key levers Download PDF

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US2890782A
US2890782A US614959A US61495956A US2890782A US 2890782 A US2890782 A US 2890782A US 614959 A US614959 A US 614959A US 61495956 A US61495956 A US 61495956A US 2890782 A US2890782 A US 2890782A
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spring
key lever
adjusting
attaching
adjusted positions
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US614959A
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Stuiber Walter
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Triumph Werke Nuernberg AG
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Triumph Werke Nuernberg AG
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    • 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
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • B41J5/26—Regulating touch, key dip or stroke, or the like

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  • the present invention relates to an adjusting device for spring loaded key levers, and more particularly to an adjustment device for the spring loaded key levers of an ofiice machine in which the types are actuated by key levers.
  • Typewriters, accounting machines, desk calculators, and other office machines include keyboards whose keys are mounted on spring loaded key levers so that it is necessary to overcome a spring force when the keys are actuated. It is known to provide adjusting means for adjusting the spring force acting on the spring loaded key levers.
  • the adjusting devices according to the known art vary the tension of the loading springs. In the event that all springs acting on a set of key levers are simultaneously adjusted, considerable forces are required for adjustment, and. a force of 7-8 kilograms may be required for adjusting the springs of the key levers of a standard typewriter. Consequently, the adjusting devices according to the known art require a transmission for adjusting a set of springs associated with a set of key levers.
  • Another object of the present invention is to simulta- :neously adjust the spring forces acting on a set of key levers without varying the spring tensions of the respective :springs so that only frictional forces have to be overcome :for carrying out an adjustment.
  • It is also an object of the present invention to provide :an adjusting device for spring loaded key levers which -does not require a transmission, and consequently requires 1 fewer parts permitting a more economical manufacture.
  • the present invention mainly consists in a device for adjusting the spring loading of key levers and comprises, in combination, supporting means, at least one key lever movably mounted on the supporting :means, spring means connected at one end to the key lever means, and at the other end thereof to adjusting position for actuating the respective type.
  • the adjusting means hold the spring means in each of the adjusted positions resiliently deformed to substantially the same extent, and angularly displace the spring means with respect to the key lever means during movement between the adjusted positions. Consequently, the spring tension of the spring means remains substantially the same in all adjusted positions of the adjusting means, while a different component of the spring tension acts on the key lever means in each of the adjusted positions.
  • Suitable operating means are provided for moving the adjusting means between the adjusted positions thereof.
  • a set of key lever means is provided, which are simultaneously adjusted.
  • Each key lever means includes an attaching hook means having a part-circular edge engaged by one end of the respective spring so that the spring is turnable about the axis .of the part-circular edge.
  • the attaching hook means are arranged in a row, and all springs associated with the key levers are turnasble about a common axis.
  • the adjusting means are turnable about an axis coinciding with the above-mentioned common axis, and include a transverse bar extending across all key levers, and supporting the other ends of the springs.
  • Fig. 1 is a fragmentary side view, partly in section, illustrating a preferred embodiment of the present invention.
  • Fig. 2 is a fragmentary plan view, partly in section, of the embodiment illustrated in Fig. 1.'
  • a set of key lever means 2 is pivotally mounted in the supporting means of the machine for pivotal movement about the pivot means 3.
  • Each key lever 2 is provided with a key 1, and is associated by means which are not shown in the drawing, with a type lever of an oflice machine, such as a typewriter, a calculator, or an accounting machine.
  • a type lever of an oflice machine such as a typewriter, a calculator, or an accounting machine.
  • Each key lever means includes a hookshaped attaching means 20 having a part-circular edge 21.
  • a set of spring means 4 is associated with the set of key levers 2, each spring 4 having at one end an engaging hook 5 which engages the part-circular edge of the associated attaching hook means 2t ⁇ and is slidable along the same so that the end of the spring 4 turns about the axis A of the part-circular edge 21. Since all centers of the part-circular edges 21 are aligned, the axis A is common to all springs 4.
  • the illustrated adjusting means includes a pair of arms 9 which are connected by a transverse bar member 7. Each of the arms 9 is mounted in the supporting means of the machine for turning movement about an axis coinciding with the axis A.
  • the supporting means include two walls 12, and the arms 9 are turnable about pins 10 passing through bores 11 in the walls 12 and being secured to the same by nuts llliz'cooperating with threaded portions of the pivot pins 10.
  • the transverse bar member 7 which extends between the arms 9 across the set of key levers 2, has a set of perforations 6, each perforation 6 being located opposite a key lever 2, one perforation 6 being associated with each spring 4 and each key lever 2.
  • the other ends of the springs 4 are hook-shaped and engage the associated perforations 6, so that the length of the springs 4'is not changed when the adjusting means 7, 9 are turned about the axis A of the pivot pins 10.
  • the end portion 5 of each spring slides along the part-circular edge 21 ofthe respective hookshaped attaching means 20' and performs a movement aboutthe same axis A.
  • An operating means is provided for turning the adjusting means 9, 7 about the pins 10, and is illustrated to be a handle lever 8 fixedly connected to a portion of the adjusting means located intermediate one arm 9 and the transverse bar 7. It will be appreciated that only the friction between the end portions 5 and the edges 21, and the friction of the pins 10 has to be overcome when the adjusting means 9, 7 are turned through handle lever 8.
  • the handle lever 8 may be operated in opposite directions out of the illustrated position and in directions of the arrows indicated by a minus sign.
  • each spring '4 urges the associated key lever means 1, '2 into engagement with the stationary stop 13.
  • a certain predetermined and selected spring tension is present in this position.
  • the maximum spring tension is exerted in the illustrated position in which the spring 4 extends perpendicular to the key lever 2.
  • the attaching means 20, and the end 5 of the spring 4 moves in a direction substantially perpendicular to the key lever 2 about the pivot pin 3. Consequently during'actuation of thekey lever in the illustrated position of the adjusting means 9, 7 and of the springs 4, the full spring tension has to be overcome when the key lever means is actuated.
  • a device for adjusting the spring loading of type actions comprising, in combination, supporting means; lever means mova'bly mounted on said supporting means; spring means connected at one end thereof to said lever means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means being connected to the other end of said spring means, and moving said other end of said spring means along a circular path having its center in said axis for holding said spring means in each of said adjusted positions resiliently deformed to the same extent, and for angularly displacing said spring means with respect to said lever means so that the spring tension of said spring means remains the same in all said adjusted positions of said adjusting means, while a different component of said spring tension acts on said lever means in each of said adjusted positions; and operating means for moving said adjusting means between said adjusted positions thereof.
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction duringmovement of said key lever means from said normal position to said actuated position; spring means connected at one end thereofto said first attaching means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about'said axis between a plurality of, adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said first attaching means while said key lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in. said one direction of said spring
  • a device for adjusting the spring loading of type actions comprising, in combination, supporting means; lever means including a first attaching means, said lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of angularly displaced adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said first attaching means while said lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said lever means is the component in said one direction of said spring tension of said spring means
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said first attaching means while said key lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means
  • a device for adjusting the spring loading of type actions comprising, in combination, supporting means; a set of lever means each including a first attaching means, said lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said lever means from said normal position to said actuated position and being aligned along a straight line in said normal position; spring means connected at one end thereof to each first attaching means for movement about an axis coinciding with said straight line; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means including a set of second attaching means aligned along a straight line parallel to said axis and connected to the other ends of said spring means and being movable along a circular path about said axis while said lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that each spring means remains resiliently deformed to the same extent and the spring tension of
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of angularly displaced adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said axis While said key lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means and the spring tension of said spring means remains substantially the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a book-shaped first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means having a substantially cincular edge and moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means and slidably engaging said circular edge of the same so that said one end of said spring means is movable along said circular edge about the axis of said circular edge; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said axis of said circular edge of said first attaching means while said key lever means is in said normal position, and
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis between a plurality of angularly displaced adjusted positions, a transverse member extending transverse to said key lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said key lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis while said key lever means is in said normal position so that said spring means remains resiliently deformed to substantially the sameextent and the spring tension of said spring
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis between a plurality of angularly displaced adjusted positions, a transverse member extending transverse to said key lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said key lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis while said key lever means is in said normal position so that said spring means remains resiliently deformed to substantially the same extent and the spring tension of said spring means
  • a device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means having a substantially circular edge and moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means and engaging said circular edge of the same so that said one end of said spring means is movable along said circular edge about the axis of said circular edge; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis of said circular edge of said first attaching means for moving said adjusting means between a plurality of adjusted positions, a transverse member extending transverse to said key lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said key lever means, said second attaching means being connected to the other end of said spring means and mov
  • said spring means is an elongated coil spring means extending in one of said adjusted positions of said adjusting means perpendicular to said key lever means, and extending in the other adjusted positions at an acute angle to said key lever means.
  • a device for simultaneously adjusting the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row; a set of spring means, each spring means connected at one end thereof to one of said first attaching means for movement about a common axis extending parallel to said row; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one
  • a device for simultaneously adjusting the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row; a set of spring means, each spring means connected at one end thereof to one of said first attaching means for movement about a common axis extending parallel to said row; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite
  • a device for simultaneously adjustin the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means having a circular edge and moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row, and said circular edges having a common axis; a set of spring means, each spring means connected at one end thereof to one of said first attaching means, each of said spring means engaging the circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said circular edge about said common axis of said circular edges; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and
  • a device for simultaneously adjusting the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching hook means having a partcircular edge and moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching hook means being arranged in a row and said part-circular edges having a common axis; a set of spring means, each spring means connected at one end thereof to one of said first hook attaching means, each of said spring means engaging the part-circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said part-circular edge about said common axis of said circular edges; adjusting means including at least one arm tur-nably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of
  • each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said spring means whereby in each of said adjusted positions of said adjusting means different components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted positions thereof.
  • a device for simultaneously adjusting the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key 1 ver means including a first attaching means having a circular edge and moving in one direction during movement of the' respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row, and said circular edges having a common axis; a set of coil spring means, each spring means connected at one end thereof to one of said first attaching means, each of said spring means engaging the circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said circular edge about said common axis of said circular edges; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said
  • a device for simultaneously adjusting the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row; a set of spring means, each spring means connected at one end thereof to one of said first attaching mews for movement about a common axis extending parallel to said row; adjusting means including a pair of arms spaced in direction of said common axis and being turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to and extending between said arms parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means
  • a device for simultaneously adjusting the spring loading of a set of key lever means comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching hook means having a partcircular edge and moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching hook means being arranged in a row, and said partcircular edges having a common axis; a set of coil spring means, each spring means connected at one end thereof to one of said first hook attaching means, each of said spring means engaging the part-circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said partcircular edge about said common axis of said circular edges; adjusting means including a pair of arms spaced in direction of said common axis and being turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving
  • a device for adjusting the spring loading of type actions comprising, in combination, supporting means; lever means including a first attaching means, said lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis between a plurality of angularly displaced adjusted positions, a transverse member extending transverse to said lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis while said lever means is in said normal position so that said spring means remains resiliently deformed to substantially the same extent and the spring tension of said spring means remains substantially the means for moving

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Description

June 16, 1959 w. STUIBER 2,890,782
ADJUSTING nsvxcs FOR spams-1.0mm KEY LEVERS sued Oct. 9. 1956 INVENTOR.
United States Patent D ADJUSTING DEVICE FOR SPRING-LOADED KEY LEVERS Walter Stuiber, Stein, near Nurnberg, Germany, assignor to Triumph Werke Numberg A.G., Numberg, Germany Application October 9, 1956, Serial No. 614,959
Claims priority, application Germany October 13, 1955 20 Claims. (Cl. 197-33) The present invention relates to an adjusting device for spring loaded key levers, and more particularly to an adjustment device for the spring loaded key levers of an ofiice machine in which the types are actuated by key levers.
Typewriters, accounting machines, desk calculators, and other office machines include keyboards whose keys are mounted on spring loaded key levers so that it is necessary to overcome a spring force when the keys are actuated. It is known to provide adjusting means for adjusting the spring force acting on the spring loaded key levers. The adjusting devices according to the known art vary the tension of the loading springs. In the event that all springs acting on a set of key levers are simultaneously adjusted, considerable forces are required for adjustment, and. a force of 7-8 kilograms may be required for adjusting the springs of the key levers of a standard typewriter. Consequently, the adjusting devices according to the known art require a transmission for adjusting a set of springs associated with a set of key levers.
It is one object of the present invention to overcome this disadvantage of the devices according to the known art, and to provide an adjusting device for spring loaded .key levers permitting adjustment of the spring force acting on the key levers without requiring any substantial adjusting force.
It is another object of the present invention to provide :an adjusting device for spring loaded levers which does not vary the spring tension of the respective springs, while producing a variation of the spring force acting on the levers.
It is another object of the present invention to provide an adjusting device for spring loaded levers in which a component of the spring tension is used for loading the .key levers.
It is a further object of the present invention to vary athe spring force acting on the key levers by varying the .angle between the spring and the respective key lever.
It is a further object of the present invention to simulta- :neously adjust the spring forces acting on a set of key .levers by moving an associated set of springs about a common axis between a plurality of angularly displaced gpositions.
Another object of the present invention is to simulta- :neously adjust the spring forces acting on a set of key levers without varying the spring tensions of the respective :springs so that only frictional forces have to be overcome :for carrying out an adjustment.
It is also an object of the present invention to provide :an adjusting device for spring loaded key levers which =-does not require a transmission, and consequently requires 1 fewer parts permitting a more economical manufacture.
With these objects in view, the present invention mainly consists in a device for adjusting the spring loading of key levers and comprises, in combination, supporting means, at least one key lever movably mounted on the supporting :means, spring means connected at one end to the key lever means, and at the other end thereof to adjusting position for actuating the respective type.
means which are mounted on the supporting means for movement between a plurality of adjusted positions. The adjusting means hold the spring means in each of the adjusted positions resiliently deformed to substantially the same extent, and angularly displace the spring means with respect to the key lever means during movement between the adjusted positions. Consequently, the spring tension of the spring means remains substantially the same in all adjusted positions of the adjusting means, while a different component of the spring tension acts on the key lever means in each of the adjusted positions. Suitable operating means are provided for moving the adjusting means between the adjusted positions thereof.
According to a preferred embodiment of the present invention, a set of key lever means is provided, which are simultaneously adjusted. Each key lever means includes an attaching hook means having a part-circular edge engaged by one end of the respective spring so that the spring is turnable about the axis .of the part-circular edge. The attaching hook means are arranged in a row, and all springs associated with the key levers are turnasble about a common axis. The adjusting means are turnable about an axis coinciding with the above-mentioned common axis, and include a transverse bar extending across all key levers, and supporting the other ends of the springs. When the adjusting means are turned by suitable operating means, the springs are turned about the common axis, and consequently the relative angular positions between each spring and the associated key lever is varied without infiuencing the spring tension. However, due to the fact that only a component of the spring tension is eifective with respect to the key lever, a movement of the adjusting means between the adjusted positions will result in differeut spring loading of the key levers. The novel features which are considered as character istic for the invention are setforth in particular in the appended claims. The invention itself, however, both ,as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific ,embodiments when read in connection with the accompanying drawings, in which;
Fig. 1 is a fragmentary side view, partly in section, illustrating a preferred embodiment of the present invention; and
Fig. 2 is a fragmentary plan view, partly in section, of the embodiment illustrated in Fig. 1.'
Referring now to the drawing, a set of key lever means 2 is pivotally mounted in the supporting means of the machine for pivotal movement about the pivot means 3. Each key lever 2 is provided with a key 1, and is associated by means which are not shown in the drawing, with a type lever of an oflice machine, such as a typewriter, a calculator, or an accounting machine. When the key lever means 1, 2 is depressed, it moves from the normal position illustrated in Fig. 1 to an actuated Each key lever means includes a hookshaped attaching means 20 having a part-circular edge 21. A set of spring means 4 is associated with the set of key levers 2, each spring 4 having at one end an engaging hook 5 which engages the part-circular edge of the associated attaching hook means 2t} and is slidable along the same so that the end of the spring 4 turns about the axis A of the part-circular edge 21. Since all centers of the part-circular edges 21 are aligned, the axis A is common to all springs 4.
An adjusting means is provided for adjusting the positions of the springs 4. The illustrated adjusting means includes a pair of arms 9 which are connected by a transverse bar member 7. Each of the arms 9 is mounted in the supporting means of the machine for turning movement about an axis coinciding with the axis A. In the Patented June 16, 1959 illustrated embodiment, the supporting means include two walls 12, and the arms 9 are turnable about pins 10 passing through bores 11 in the walls 12 and being secured to the same by nuts llliz'cooperating with threaded portions of the pivot pins 10.
The transverse bar member 7 which extends between the arms 9 across the set of key levers 2, has a set of perforations 6, each perforation 6 being located opposite a key lever 2, one perforation 6 being associated with each spring 4 and each key lever 2. The other ends of the springs 4 are hook-shaped and engage the associated perforations 6, so that the length of the springs 4'is not changed when the adjusting means 7, 9 are turned about the axis A of the pivot pins 10. During such movement of the adjustingmeans 9, 7, the end portion 5 of each spring slides along the part-circular edge 21 ofthe respective hookshaped attaching means 20' and performs a movement aboutthe same axis A. An operating means is provided for turning the adjusting means 9, 7 about the pins 10, and is illustrated to be a handle lever 8 fixedly connected to a portion of the adjusting means located intermediate one arm 9 and the transverse bar 7. It will be appreciated that only the friction between the end portions 5 and the edges 21, and the friction of the pins 10 has to be overcome when the adjusting means 9, 7 are turned through handle lever 8. The handle lever 8 may be operated in opposite directions out of the illustrated position and in directions of the arrows indicated by a minus sign.
In the illustrated position, each spring '4 urges the associated key lever means 1, '2 into engagement with the stationary stop 13. A certain predetermined and selected spring tension is present in this position. When the key lever means 1, 2 is actuated, the key lever 2 moves away from the stop 13, and the respective spring 4 is tensioned to a greater degree so that upon release of the key lever means 1, 2, the respective spring 4 returns the key lever means from the actuated position to the normal illustrated position engaging the stop 13.
The maximum spring tension is exerted in the illustrated position in which the spring 4 extends perpendicular to the key lever 2. When the key lever means 1, 2 is actuated, the attaching means 20, and the end 5 of the spring 4 moves in a direction substantially perpendicular to the key lever 2 about the pivot pin 3. Consequently during'actuation of thekey lever in the illustrated position of the adjusting means 9, 7 and of the springs 4, the full spring tension has to be overcome when the key lever means is actuated.
However, when the adjusting means 9, 7 are turned by the operating means 8 out of the position illustrated in solid lines and into the position illustrated in broken lines in Fig. 1, only a component of the spring tension P acts in the direction of movement of the attaching means 20. The spring tension of the respective spring 4 remains the same, since the distance between the ends of the respective spring 4 does not change when the adjusting means 7, 9 are'turned aboutthe axis A. The invariable constant spring tension is indicated by a vector P. When the adjusting means are in the position illustratedin broken lines, only the force P is etfectiveon the key lever means, and such force P is equal to P cos a, a beingthe ang'le through which the adjusting means 7, 9and the spring 'means 4 are turned.
Assuming a distance L between the axis of the pivot means 3 and the axis A, the maximal moment exerted by the respective'spring means 4 is P L. In the adjusted positions of the adjusting .means, the turning moment is smaller and equals P'XL whichis the same as'PXL sinceL is L cos a.
"From the above description of the preferred embodiment of the present invention it will become apparent that the spring forces acting on the key levers can be adjusted by turning the adjusting meansjabout-the axis A. During such turning movement of the adjusting means, the spring tension of the springs 4 is not varied at all so that only frictional forces have to be overcome by operating the adjusting means.
It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of adjusting devices for spring loaded levers differing from the types described above.
While the invention has been illustrated and described as embodied in an adjusting device for a set of spring loaded key levers in which an equal spring tension is maintained in all adjusted positions of the device while a different component of the spring tension acts on the key levers in each adjusted position, it ,is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of-the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range "of equivalence of the following claims.
What is claimed as new and desired to be secured by Letters Patent is:
l. A device for adjusting the spring loading of type actions comprising, in combination, supporting means; lever means mova'bly mounted on said supporting means; spring means connected at one end thereof to said lever means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means being connected to the other end of said spring means, and moving said other end of said spring means along a circular path having its center in said axis for holding said spring means in each of said adjusted positions resiliently deformed to the same extent, and for angularly displacing said spring means with respect to said lever means so that the spring tension of said spring means remains the same in all said adjusted positions of said adjusting means, while a different component of said spring tension acts on said lever means in each of said adjusted positions; and operating means for moving said adjusting means between said adjusted positions thereof.
2. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction duringmovement of said key lever means from said normal position to said actuated position; spring means connected at one end thereofto said first attaching means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about'said axis between a plurality of, adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said first attaching means while said key lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in. said one direction of said springtension of said spring means whereby in each of said padjusted positions, .a different component-of said spring tension acts on said key lever means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof. 7
3. A device for adjusting the spring loading of type actions comprising, in combination, supporting means; lever means including a first attaching means, said lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of angularly displaced adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said first attaching means while said lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a different component of said spring tension acts on said lever means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
4. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for turning movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said first attaching means while said key lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a different component of said spring tension acts on said key lever means, said spring means extending in said one direction in one of said adjusted positions of said adjusting means; and handle means fixedly connected to said adjusting means for turning said adjusting means between said adjusted positions thereof.
5. A device for adjusting the spring loading of type actions comprising, in combination, supporting means; a set of lever means each including a first attaching means, said lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said lever means from said normal position to said actuated position and being aligned along a straight line in said normal position; spring means connected at one end thereof to each first attaching means for movement about an axis coinciding with said straight line; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means including a set of second attaching means aligned along a straight line parallel to said axis and connected to the other ends of said spring means and being movable along a circular path about said axis while said lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that each spring means remains resiliently deformed to the same extent and the spring tension of said spring means remains the same in each of said adjusted positions, while the spring force acting on said lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a difierent component of said spring tension acts on said lever means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
6. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of angularly displaced adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said axis While said key lever means is in said normal position, and moving said other end of said spring means along a circular path having its center in said axis so that said spring means and the spring tension of said spring means remains substantially the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each of 'said adjusted positions, a diiferent component of said spring tension acts on said key lever means, said spring means extending in said one direction in one of said adjusted positions of said adjusting means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
7. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a book-shaped first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means having a substantially cincular edge and moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means and slidably engaging said circular edge of the same so that said one end of said spring means is movable along said circular edge about the axis of said circular edge; adjusting means mounted on said supporting means for turning movement about said axis between a plurality of adjusted positions, said adjusting means including second attaching means connected to the other end of said spring means and being movable along a circular path about said axis of said circular edge of said first attaching means while said key lever means is in said normal position, and
' moving said other end of said spring means along a circular path having its center in said axis so that said spring means remains resiliently deformed to substantially the same extent and the spring tension of said spring means remains substantially the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a different component of said 7 spring tension acts on said key lever means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
8. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis between a plurality of angularly displaced adjusted positions, a transverse member extending transverse to said key lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said key lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis while said key lever means is in said normal position so that said spring means remains resiliently deformed to substantially the sameextent and the spring tension of said spring means remains substantially the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a different component of said spring tension acts on said key lever means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
9. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis between a plurality of angularly displaced adjusted positions, a transverse member extending transverse to said key lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said key lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis while said key lever means is in said normal position so that said spring means remains resiliently deformed to substantially the same extent and the spring tension of said spring means remains substantially the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a different component of said spring tension acts on said key lever means, said spring means extending in said one direction in one of said adjusted positions of said adjusting means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
10. A device as set forth in claim 9 wherein said spring means extend in said one adjusted position of said adjusting means perpendicular to said key lever means, and extend in the other adjusted positions of said adjusting means at an acute angle to said key lever means.
11. A device for adjusting the spring loading of key levers comprising, in combination, supporting means; key lever means including a first attaching means, said key lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means having a substantially circular edge and moving in one direction during movement of said key lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means and engaging said circular edge of the same so that said one end of said spring means is movable along said circular edge about the axis of said circular edge; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis of said circular edge of said first attaching means for moving said adjusting means between a plurality of adjusted positions, a transverse member extending transverse to said key lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said key lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis of said circular edge while said key lever means is in said normal position so that said spring means remains resiliently deformed to substantially the same extent and the spring tension of said spring means remains substantially the same in each of said adjusted positions, while the spring force acting on said key lever means is the component in said one direction of said spring tension of said spring means whereby in each of said adjusted positions, a ditferent component of said spring tension acts on said key lever means; and operating means connected to said adjusting means for moving said adjusting means between said adjusted positions thereof.
12. A device as set forth in claim 11 wherein said spring means is an elongated coil spring means extending in one of said adjusted positions of said adjusting means perpendicular to said key lever means, and extending in the other adjusted positions at an acute angle to said key lever means.
13. A device for simultaneously adjusting the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row; a set of spring means, each spring means connected at one end thereof to one of said first attaching means for movement about a common axis extending parallel to said row; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one of said key lever means and being connected to the other end of the respective spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while smd key lever means of said set of key lever means are in said normal positions so that each of said spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said spring means .whereby in each of said adjusted positions of said adjusting means dif ferent components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted positions thereof.
14. A device for simultaneously adjusting the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row; a set of spring means, each spring means connected at one end thereof to one of said first attaching means for movement about a common axis extending parallel to said row; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one of said key lever means and being connected to the other end of the respective spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said spring means whereby in each of said adjusted positions of said adjusting means diiferent components of said equal spring tensions act on said key lever means of said set of key lever means, said spring means extending in one of said adjusted positions in said one direction and perpendicular to said key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted positions thereof.
15. A device for simultaneously adjustin the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means having a circular edge and moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row, and said circular edges having a common axis; a set of spring means, each spring means connected at one end thereof to one of said first attaching means, each of said spring means engaging the circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said circular edge about said common axis of said circular edges; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one of said key lever means and being connected to the other end of the respective spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said spring means whereby in each of said adjusted positions of said adjusting means different components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means be tween said adjusted positions thereof.
16. A device for simultaneously adjusting the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching hook means having a partcircular edge and moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching hook means being arranged in a row and said part-circular edges having a common axis; a set of spring means, each spring means connected at one end thereof to one of said first hook attaching means, each of said spring means engaging the part-circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said part-circular edge about said common axis of said circular edges; adjusting means including at least one arm tur-nably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and tosaid row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means.
being located opposite one of said key lever means and being connected to the other end of the respective spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said spring means whereby in each of said adjusted positions of said adjusting means different components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted positions thereof.
17. A device for simultaneously adjusting the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key 1 ver means including a first attaching means having a circular edge and moving in one direction during movement of the' respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row, and said circular edges having a common axis; a set of coil spring means, each spring means connected at one end thereof to one of said first attaching means, each of said spring means engaging the circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said circular edge about said common axis of said circular edges; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to said arm and extending parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one of said key lever means and being connected to the other end of the respective coil spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said coil spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said coil spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said coil spring means whereby in each of said adjusted positions of said adjusting means difierent components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted posi-' tions thereof.
18. A device for simultaneously adjusting the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching means moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching means being arranged in a row; a set of spring means, each spring means connected at one end thereof to one of said first attaching mews for movement about a common axis extending parallel to said row; adjusting means including a pair of arms spaced in direction of said common axis and being turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to and extending between said arms parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one of said key lever means and being connected to the other end of the respective spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said spring means aretsubstantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said spring means whereby in each of said adjusted positions of said adjusting means difierent components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted positions thereof.
19. A device for simultaneously adjusting the spring loading of a set of key lever means, comprising, in combination, a set of parallel key lever means, each key lever means being mounted on said supporting means for independent pivotal movement between a normal position and an actuated position, each key lever means including a first attaching hook means having a partcircular edge and moving in one direction during movement of the respective key lever means from said normal position to said actuated position, said first attaching hook means being arranged in a row, and said partcircular edges having a common axis; a set of coil spring means, each spring means connected at one end thereof to one of said first hook attaching means, each of said spring means engaging the part-circular edge of the respective first attaching means so that said one end of each of said spring means is movable along said partcircular edge about said common axis of said circular edges; adjusting means including a pair of arms spaced in direction of said common axis and being turnably mounted on said supporting means for movement about an axis coinciding with said common axis for moving said adjusting means between a plurality of adjusted positions, a transverse bar fixedly connected to and extending between said arms parallel to said common axis and to said row of attaching means across said set of key lever means, and a row of second attaching means secured to said transverse bar, each second attaching means being located opposite one of said key lever means and being connected to the other end of the respective coil spring means associated with the respective key lever means, each of said second attaching means being movable along a circular path about said common axis while said key lever means of said set of key lever means are in said normal positions so that each of said coil spring means remains resiliently deformed to substantially the same extent, and the spring tensions of said coil spring means are substantially equal in each of said adjusted positions of said adjusting means while the spring forces acting on said key lever means are the components in said one direction of the spring tensions of said coil spring means whereby in each of said adjusted positions of said adjusting means different components of said equal spring tensions act on said key lever means of said set of key lever means; and an operating means secured to said adjusting means for moving said adjusting means between said adjusted positions thereof.
20. A device for adjusting the spring loading of type actions comprising, in combination, supporting means; lever means including a first attaching means, said lever means being mounted on said supporting means for movement between a normal position and an actuated position, said first attaching means moving in one direction during movement of said lever means from said normal position to said actuated position; spring means connected at one end thereof to said first attaching means for movement about an axis; adjusting means including at least one arm turnably mounted on said supporting means for movement about an axis coinciding with said axis between a plurality of angularly displaced adjusted positions, a transverse member extending transverse to said lever means across the same and being fixedly connected to said arm, and second attaching means secured to said transverse member opposite said lever means, said second attaching means being connected to the other end of said spring means and movable along a circular path about said axis while said lever means is in said normal position so that said spring means remains resiliently deformed to substantially the same extent and the spring tension of said spring means remains substantially the means for moving said adjusting means between said same in each of said adjusted positions, while the spring adjusted positions thereof. force acting on said lever means is the component in said one direction of said spring tension of said spring means References Clted 111 the file 0f fllls Patent whereby in each of said adjusted positions, a difierent 5 UNITED STATES PATENTS component of said spring tension acts on said lever means; and operating means connected to said adjusting 2148877 Rauscher 1939
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US3409111A (en) * 1967-06-07 1968-11-05 Scm Corp Keylever touch control with compensating means directly proportional to keylever touch
US3786905A (en) * 1970-12-15 1974-01-22 Paillard Sa Device for the individual adjustment of the striking force in a typewriter
US3835772A (en) * 1971-10-06 1974-09-17 Heyer Inc Compensating impression roller mount for stencil duplicator
US4188137A (en) * 1977-12-12 1980-02-12 Scm Corporation Low silhouette keyboard

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