Keyboard locking device

Claim 2

In an accounting machine having a plurality of control keys for controlling, when actuated, a machine operation, means for selectively enabling a predetermined number of control keys for actuation including a. blocking means slidably mounted adjacent said control keys for disabling the control keys from actuation, said blocking means adapted for movement to a first position releasing a first number of control keys for actuation and to a second position releasing a second number of control keys for actuation; and b. a key-operated rotatably mounted locking means engaging said blocking means and adapted, where rotated in one direction, to move said blocking means to said first position and when rotated in the opposite direction, to move said blocking means to said second position whereby a predetermined number of control keys are released for actuation.

Claim 3

The accounting machine of claim 1 in which said locking means includes a. a rotatably mounted key operated lock cylinder adapted for rotation in opposite directions; b. a drive member slidably mounted adjacent said lock cylinder and engaging said blocking means; c. and means mounted on said lock cylinder engaging said drive member and adapted, upon rotation of said lock cylinder in opposite directions, to move said drive member to two different positions whEreby said blocking means is selectively moved to said first and second position.

Claim 4

The accounting machine of claim 2 in which a. said drive member includes an arcuate slot, and b. said engaging means comprises a stud member positioned within said arcuate slot whereby upon rotation of said locking cylinder in opposite directions, said drive member is moved to two different positions.

Claim 5

The accounting machine of claim 3 which includes a normally disabled locking member slidably mounted adjacent each of said control keys and adapted, when released, to lock a control key in an actuated position, said locking member engaging said drive member whereby upon movement of said drive member, said locking member is released for operation.

Claim 6

In an accounting machine having a plurality of control keys for controlling, when actuated, a machine operation, means for selectively enabling a predetermined number of control keys for actuation including a. a first blocking member slidably mounted adjacent said control keys for normally disabling the control keys from actuation, said blocking member adapted for movement to a first position releasing a first number of control keys for actuation and to a second position releasing a second number of control keys for actuation; b. a normally disabled locking member slidably mounted adjacent the control keys and adapted, when released, to lock a control key in an actuated position; c. movable drive means engaging said first blocking member and said locking member and adapted, when actuated, to release said locking member for operation and to move said first blocking member to either of said first and second positions; d. a key-operated, rotatably mounted lock cylinder engaging said drive means, said lock cylinder adapted, when rotated in one direction to actuate said drive means whereby said first blocking member is moved to said first position, and when rotated in an opposite direction, said blocking member is moved to said second position; e. a second blocking member engaging said locking member for holding said locking member in a disabled position; f. and first control means engaging said second blocking means and adapted, upon completion of a machine operation, to disable said second blocking member whereby upon rotation of said lock cylinder, an actuated control key is locked in its actuated position.

Claim 7

In an accounting machine having a plurality of control keys for controlling, when actuated, a machine operation, means for selectively enabling a predetermined number of control keys for actuation including a. a first blocking member slidably mounted adjacent said control keys for normally disabling the control keys from actuation, said blocking member adapted for movement to a first position releasing a first number of control keys for actuation and to a second position releasing a second number of control keys for actuation; b. a normally disabled locking member slidably mounted adjacent the control keys and adapted, when released, to lock a control key in an actuated position; c. movable drive means engaging said first blocking member and said locking member and adapted, when actuated, to release said locking member for operation and to move said first blocking member to either of said first and second positions; d. a key-operated, rotatably mounted lock cylinder engaging said drive means, said lock cylinder adapted, when rotated in one direction to actuate said drive means whereby said first blocking member is moved to said first position, and when rotated in an opposite direction, said blocking member is moved to said second position; e. a second blocking member engaging said locking member for holding said locking member in a disabled position; f. and first control means engaging said second blocking means and adapted, upon completion of a machine operation, to disable said second blocking member whereby upon rotation of said lock cylinder, an actuated control key is locked in its actuated position.

Claim 8

The accounting machine of claim 5 which includes second control means engaging said second blocking member and adapted, upon initiation of a machine operation, to move said second blocking member to a position holding said locking member in a disabled position during a machine operation, whereby a control key is held in its actuated position during a machine operation.

Claim 9

The accounting machine of claim 5 in which said drive means includes a. a slidable mounted drive member engaging said first blocking member; b. an arm member rotatably mounted adjacent to and engaging said drive member and adapted for movement to a position holding said locking member in a disabled position; c. means engaging said arm member for normally urging the arm member to said holding position; d. and means interconnecting said lock cylinder and said drive member whereby upon rotation of said lock cylinder, said drive member is moved to position said first blocking member to said first or second position and to rotate said arm member against the action of said urging means to a position releasing said locking member for operation.

Claim 10

The accounting machine of claim 5 in which said second blocking member comprises a. a rotatably mounted bellcrank having a blocking portion positioned adjacent said locking member; b. means engaging said bellcrank for normally urging the bellcrank in a direction whereby the blocking portion is moved into engagement with the locking member, thereby blocking movement of the locking member; c. and said first control means includes a first elecTromagnetic actuating member engaging said bellcrank, and adapted, upon operation at the end of a machine operation, to rotate said bellcrank whereby the blocking portion is disengaged from said locking member.

Claim 11

The accounting machine of claim 8 which includes a. a latch member rotatably mounted adjacent said bellcrank; b. and means engaging said latch member and adapted, upon movement of said bellcrank by said electromagnetic actuating means, to rotate said latch member to a position latching said bellcrank whereby the blocking portion of said bellcrank is disabled from a blocking position with said locking member.

Claim 12

The accounting machine of claim 9 which includes a second electromagnetic actuating member engaging said latch member and adapted, when operated at the start of a machine operation, to rotate said latch member thereby releasing said bellcrank whereby the bellcrank is moved by said urging means in a direction to position the blocking portion of the bellcrank in blocking engagement with said locking member.

Claim 13

In an accounting machine having a plurality of control keys for controlling, when actuated, a machine operation, means for selectively controlling the actuation of the control keys including a. a first detent member slidably mounted adjacent said control keys for normally disabling the control keys from actuation, said first detent member adapted for movement to a first position thereby releasing a first number of control keys for actuation and to a second position thereby releasing a second number of control keys for actuation; b. first resilient means engaging said first detent member for normally urging said detent member toward a position disabling the control keys from actuation; c. a second detent member slidably mounted adjacent said control keys and adapted, when released, to lock a control key in an actuated position; d. a blocking arm rotatably mounted adjacent the second detent member; e. second resilient means engaging said blocking arm and adapted to move said arm to a position disabling the release of said second detent member; f. a bellcrank member rotatably mounted adjacent said second detent member, said bellcrank member having a blocking portion positioned adjacent said second detent member; g. third resilient means engaging said bellcrank member and adapted to move said bellcrank to a position whereby the blocking portion disables the movement of said second detent member; h. a slidable mounted drive member engaging said first detent member and said blocking arm and adapted, when actuated, to rotate said arm to release said second detent member and to move said first detent member to either of said first and second positions; e. a rotatably mounted key operated lock cylinder engaging said drive member and adapted, when rotated in one direction, to actuate said drive member to position said first detent member in said first position and when rotated in the opposite direction to position said first detent member in said second position; j. an actuating member engaging said bellcrank member and adapted, when operated, to rotate said bellcrank member to a position whereby the blocking portion of said bellcrank member is positioned to release said second detent member; k. and a first electromagnetic operating member engaging said actuating member and adapted to operate said actuating member at the end of a machine operation whereby upon rotation of said lock cylinder, after a machine operation has ended, a predetermined control key will be locked in an actuated position.

Claim 14

In an accounting machine having a plurality of control keys for controlling, when actuated, a machine operation, means for selectively controlling the actuation of the control keys including a. a first detent member slidably mounted adjacent said control keys for normally disabling the control keys from actuation, said first detent member adapted for movement to a first position thereby releasing a first number of control keys for actuation and to a second position thereby releasing a second number of control keys for actuation; b. first resilient means engaging said first detent member for normally urging said detent member toward a position disabling the control keys from actuation; c. a second detent member slidably mounted adjacent said control keys and adapted, when released, to lock a control key in an actuated position; d. a blocking arm rotatably mounted adjacent the second detent member; e. second resilient means engaging said blocking arm and adapted to move said arm to a position disabling the release of said second detent member; f. a bellcrank member rotatably mounted adjacent said second detent member, said bellcrank member having a blocking portion positioned adjacent said second detent member; g. third resilient means engaging said bellcrank member and adapted to move said bellcrank to a position whereby the blocking portion disables the movement of said second detent member; h. a slidable mounted drive member engaging said first detent member and said blocking arm and adapted, when actuated, to rotate said arm to release said second detent member and to move said first detent member to either of said first and second positions; e. a rotatably mounted key operated lock cylinder engaging said drive member and adapted, when rotated in one direction, to actuate said drive member to position said first detent member in said first position and when rotated in the opposite direction to position said first detent member in said second position; j. an actuating member engaging said bellcrank member and adapted, when operated, to rotate said bellcrank member to a position whereby the blocking portion of said bellcrank member is positioned to release said second detent member; k. and a first electromagnetic operating member engaging said actuating member and adapted to operate said actuating member at the end of a machine operation whereby upon rotation of said lock cylinder, after a machine operation has ended, a predetermined control key will be locked in an actuated position.

Claim 15

The accounting machine of claim 11 which includes a. a latch member rotatably mounted adjacent said bellcrank member; b. and a fourth resilient means engaging said latch member and adapted, upon movement of said bellcrank member by said actuating member, to rotate said latch member to a position latching said bellcrank member whereby the blocking portion of said bellcrank is Held in a position releasing said second detent member.

Claim 16

The accounting machine of claim 12 which includes a. a second actuating member engaging said latch member and adapted, when operated, to rotate said latch member thereby releasing said bellcrank member to the action of said third resilient means; b. and a second electromagnetic operating member engaging said second actuating member and adapted to operate said second actuating member at the start of a machine operation whereby said second detent member is disabled from being released during a machine operation.