Control circuit for lubricating apparatus

Claim 2

A control for periodically initiating operation of an electrically actuated apparatus and stopping it in response to completion of a cycle thereof comprising: an initiating switch; means for periodically actuating said initiating switch; a cycle-responsive switch adapted to be actuated in response to completion of a cycle of said apparatus; a relay including respective sets of normally open and normally closed contacts; circuit means including switch means selectively operable to provide a first mode connecting said set of normally closed contacts in a power circuit with said apparatus for actuation thereof and also connecting said relay in an operating circuit with said cycle-responsive switch and with said initiating switch to cause energization of said relay upon completion of a cycle of said apparatus and deenergization thereof when said initiating switch is actuated; and a second mode connecting said set of normally open contacts in said power circuit with said apparatus for actuation thereof and also connecting said relay in an operating circuit with said cycle-responsive switch and with said initiating switch to cause energization of said relay when said initiating switch is actuated and deenergization thereof upon completion of a cycle of said apparatus; whereby said first mode initiates operation of said apparatus for an initial cycle in response to connection of a power source across said power circuit and thereafter causes operation of said apparatus at periodic intervals determined by said timer means and whereby said second mode causes operation of said apparatus solely at periodic intervals determined by said timer means.

Claim 3

A control as set forth in claim 1 wherein said cycle-responsive switch includes first and second sets of contacts adapted to close and to open, respectively, in response to said completion of a cycle of said apparatus, said first set of contacts being connected, when in said first mode, in said operating circuit for said relay and said second set of contacts being connected, when in said second mode, in said operating Circuit.

Claim 4

A control as set forth in claim 2 wherein said relay includes a further set of normally open contacts connected in a circuit across said first set of contacts to provide a latching circuit for said relay.

Claim 5

A control as set forth in claim 3 wherein said switch means comprises a first single-pole, double-throw switch section having a pair of contacts each respectively connected to one contact of said respective sets of relay contacts and a switch blade operable to close on either one of said pair of contacts, said blade being connected in a circuit with said initiating switch.

Claim 6

A control as set forth in claim 4 wherein said initiating switch includes respective sets of normally closed and normally open contacts, said switch blade being connected in a circuit with the normally closed contacts of said initiating switch, said relay including a still further set of normally open contacts connected in a circuit across the normally open contacts of said initiating switch, said switch means including a second switch section having contacts which are open in said first mode and closed in said second mode to connect said still further set of normally open relay contacts and said second set of contacts of the cycle-responsive switch in said relay operating circuit when in said second mode.

Claim 7

A control as set forth in claim 5 wherein said normally closed and normally open contacts of said initiating switch are adapted to open and to close, respectively, for a relatively short interval when said initiating switch is actuated.

Claim 8

A control as set forth in claim 1 further comprising time delay means for breaking said power circuit in response to operation of said apparatus for a predetermined time interval without actuation of said cycle-responsive switch.

Claim 9

A control as set forth in claim 7 further comprising signal means adapted to be actuated in response to operation of said time-delay means.

Claim 10

A control as set forth in claim 1 further comprising manual switch means interconnected in a circuit with said initiating switch and with the first said selectively operable switch means, said manual switch means being manually operable to initiate a cycle of operation of said apparatus.

Claim 11

A control as set forth in claim 1 wherein said means for periodically actuating said initiating switch comprises a timer motor.

Claim 12

In a lubricating system of the type comprising electrically actuated pumping apparatus for developing lubrication pressure in the system, a control for periodically initiating operation of the pumping apparatus and stopping it in response to development of a predetermined lubrication pressure in the system, and then venting the system, comprising: a timer switch; means for periodically actuating said timer switch; a pressure-responsive switch including first and second sets of contacts adapted to close and to open, respectively, in response to development of said predetermined pressure in the system and to open and close, respectively, upon venting of the system; a relay including respective sets of normally open and normally closed contacts; circuit means including means selectively operable to provide a first mode connecting said set of normally closed contacts in a power circuit with said apparatus for actuation thereof and also connecting said relay in an operating circuit with said first set of contacts of the pressure-responsive switch and with said timer switch to cause energization of said relay upon development of said predetermined pressure and deenergization thereof when said timer switch is actuated; and a second mode connecting said set of normally open contacts in said power circuit with said apparatus for actuation thereof and also connecting said relay in an operating circuit with said second set of contacts of the pressure-responsive switch and with said timer switch to cause energization of said relay when said timer switch is actuated and deenergization thereof upon development of said predetermined pressure; whereby said first mode initiates operation of said pumping apparatus for an initial lubrication cycle in response to connection of a power source across said power circuit and thereafter causes operation of said pumping apparatus at periodic lubrication intervals determined by said timer means and whereby said second mode causes operation of said pumping apparatus solely at periodic lubrication intervals determined by said timer means.

Claim 13

In a lubricating system of the type comprising electrically actuated pumping apparatus for developing lubrication pressure in the system, a control for periodically initiating operation of the pumping apparatus and stopping it in response to development of a predetermined lubrication pressure in the system, and then venting the system, comprising: a timer switch; means for periodically actuating said timer switch; a pressure-responsive switch including first and second sets of contacts adapted to close and to open, respectively, in response to development of said predetermined pressure in the system and to open and close, respectively, upon venting of the system; a relay including respective sets of normally open and normally closed contacts; circuit means including means selectively operable to provide a first mode connecting said set of normally closed contacts in a power circuit with said apparatus for actuation thereof and also connecting said relay in an operating circuit with said first set of contacts of the pressure-responsive switch and with said timer switch to cause energization of said relay upon development of said predetermined pressure and deenergization thereof when said timer switch is actuated; and a second mode connecting said set of normally open contacts in said power circuit with said apparatus for actuation thereof and also connecting said relay in an operating circuit with said second set of contacts of the pressure-responsive switch and with said timer switch to cause energization of said relay when said timer switch is actuated and deenergization thereof upon development of said predetermined pressure; whereby said first mode initiates operation of said pumping apparatus for an initial lubrication cycle in response to connection of a power source across said power circuit and thereafter causes operation of said pumping apparatus at periodic lubrication intervals determined by said timer means and whereby said second mode causes operation of said pumping apparatus solely at periodic lubrication intervals determined by said timer means.