US1640127A - Case-shift mechanism - Google Patents

Description

Aug. 23,1927. 1,640,127

J. F. KOCA' CASE SHIFT MECHANISM Filed Jan. 10, '1925 V GINVENTO/F:

Patented Aug. 23, 1927.

UNITED STATES PATENT OFFICE.

JAMES I. KOCA, OF WOODSTOCK, ILLINOIS, ASSIGNOR TO WOODSTOCK TYPEWRITER COMPANY, OFYWOOIDSTOCK, ILLINOIS, A CORPORATION OF ILLINOIS.

CASE-SHIFT MECHANISM.

Application filed January This invention relates to case shift mechanism for typwriters and is especially useful in connection with power driven typewriters such as that shown in the application of Otto A. Hokanson, Serial No. 732,-

615, filed August 18, 1924.

. The invention has for one of its objects the provision of case shift mechanism which will permit the shiftablc member to be moved by a power actuated drive and will retain the member in its shifted position so long as the shift key is held depressed.

A further object is to provide ease shift mechanism which shall be of improvedconstruction and operation.

The invention is exemplified in the combination and arran ement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing Fig. 1 is a vertical sectional view of a portion of a typewriter having one embodiment ofdthe present invention applied thereto;

Fig. 2 is a fragmentary top plan view of a detail of construction.

- The numeral 10 designates a typewriter frame having a power driven toothed cylinder 11 journaled therein. A shift-lever 12'is pivoted at 13 and carriesa contact device 14 arranged to engage a lug 15 on an actuator 16. The actuator 16 is pivotally 36 connected at 17 to .a rocker 18 pivotally mounted at 19 on a cross-bar 20. When the lever 12 is depressed the actuator 16 will be moving downwardly to bring a contact tooth 21 into engagement with the power drive 11. This'will move the actuator 16 forwardly until its inclined surface 22 contacts wit an adjustable screw 23 mounted on a cross-bar 24. The contact between the cam face 22 and the screw 23, will disenga e the tooth 21 from the power drive 11. e spring'25 will then return the actuator 16 to its initial o'sition.

A link 26 is pivotally connected at 27 to the rocker 18 and has its rear end pivotally connectedat 28 to an arm 29 with the shift frame 30. The shift frame 30 is pivotally mounted at31 on the typewriter frame 10. An adjustable slid ng connection comprising a screw 32 and slots 33 permits return movement of the rocker.

formed rigid- 10, 1925. Serial No. 1,530.

18' while the rear end ofthe link 26 is retained in its forward positionl Forward movement of the rocker will rotate the shift frame 30 in a clockwise direction to shift the platen for upper case writing. Means is provided for retaining the platen in its upper position solong as the shift lever 12 is depressed. This retaining mechanism comprises a stop 34 mounted on the shift frame 30 and a detent 35 having a shoulder 36 thereonfor engaging the stop 34. The detent 35 is pivoted at 37 and is provided with a sprin 38 for normally urging the detent upwardly. When the shift frame is actuated by thepower mechanism the shoulder 36 will snap into position behind the stop 34 and retain'the platen in its uppermost position.

The forward end of the detent 35 in front of the shoulder 36 is slotted to receive a releasing dog 39 pivotally mounted at 40 in the slotted end of the detent. The dog 39 is provided with .a downwardly extending arm 41 which is pivoted at 42 to a link 43. The link 43 is pivotally connected at 44 to an arm 45 formed integral with the shift lever 12 and extending upwardly therefrom. When the key lever is depressed the arm 45 moves forwardly, thus rotating the release dog 39 in a clockwise direction so as to bring ll the upper edge of the dog flush with. theupper face of the bifurcated portion of the detent 35. This permits the shoulder 36 to engage the stop 34 and so long as the shift lever is depressed the shoulder 36 will hold 60 the shiftframe 30 in its u per position irrespective of the action of t e power driven mechanism. When the shift lever is released, however, the spring 46 will raise the shift lever and move the arm 45 rearwardly which will rotate the release dog 39 in a counter-clockwise direction and force the shoulder 36 out of engagement with the stop 34. This will permit the platen to move downwardly into its lower case position. In this we mechanism is provided by means of whic the power for shifting the typewriter parts is furnished by the power drive 11 but the arts will remain in their shifted position so ong as the key is held depressed.

I claim v 1. Typewriter mechanism comprising a pivoted shift frame, a stop mounted on said shift frame, a spring actuated detent having a shoulder for engaging said stop, a 110 release dog movably connected on said detent adjacent said shoulder for engaging said stop to disconnect said detent from said stop, a shift lever, and means for connecting said shift lever with said dog.

'2. Typewriter mechanism comprising a shift frame, a power drive, an actuator for said shift frame, a shift lever for connecting said actuator and power drive, a link for connecting said actuator and shift frame arranged to permit return movement of said actuator independently of said shift frame, a detent for automatically retaining said shift frame in its shifted position, and means controlled by said shift lever for releasing said detent.

3. In a typewriter, a pivotally mounted shift frame having a stop member mounted thereon, a detent slidably engaging said stop member and having a shoulder for engaging said stop member to retain said frame in shifted position, a shift key lever, a releasing dog pivotally mounted on said detent adjacent said shoulder and in position to engage said stop member, and means connecting said dog with said shift key lever to force said detent out of engagement with said stop member when said shift key lever is released.

'4. In a typewriter, a pivotally mounted shiftframe, a shift key lever, astop member carried by said shift frame, a detent having a shoulder thereon for engaging said stop member to retain said shift frame in shifted position, a spring for urging said shoulder into holding relation with said stop member when said frame is shifted, a bell crank lever mounted on said dedrive to effect case shift movement, a case shift lever for moving said actuator into operative relation with said power drive,

means for automatically disconnecting said actuator from said power drive after a case shift movement is effected, a spring actuated detent having a shoulder thereon for retaining said shift frame in its shifted position, a release dog pivotally mounted on said detent adjacent said shoulder, an arm projecting upwardly from said case shift lever, and'a link connecting said arm and release dog to release said detentwhen said case shiftlever is released.

In testimony whereof I have signed my name to this s ecification on this 7th day of January, A. 1925.

JAMES F. KOCA

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