Electrically operated staplers

Claim 2

A staple-driving tool comprising a body having a head, a load coil in said head, a magnetic member disposed in said head to be moved by the coil when said coil is energized, staple-driving means on said member, a switch on said body, and circuit means including said coil and switch, to automatically energize said coil repeatedly at predetermined intervals of time, should the switch be actuated and remain in actuated condition longer than said predetermined interval of time, means to supply alternating current to said circuit means, said circuit means including means to energize said coil during the first full half cycle of said alternating current supplied following actuation of said switch, and to energize said coil only once should said switch be actuated and then deactuated in less than said predetermined interval of time after said actuation.

Claim 3

A staple-driving tool comprising a body having a head, a load coil in said head, a magnetic member disposed in said head to be moved by the coil when said coil is energized, staple-driving means on said member, a switch on said body, and circuit means including said coil and switch, to automatically energize said coil repeatedly at predetermined intervals of time, should the switch be actuated and remain in actuated condition longer than said predetermined interval of time, means to supply alternating current to said circuit means, said circuit means including means to energize the coil only during similar half cycles of alternating current supplied to said circuit.

Claim 4

A staple-driving tool comprising a body having a head, a load coil in said head, a magnetic member disposed in said head to be moved by the coil when said coil is energized, staple-driving means on said member, a switch on said body, and circuit means including said coil and switch, to automatically energize said coil repeatedly at predetermined intervals of time, should the switch be actuated and remain in actuated condition longer than said predetermined interval of time, means to supply alternating current to said circuit means, said circuit means including means to energize the coil only during similar half cycles of alternating current supplied to said circuit.

Claim 5

The combination of claim 1, and said circuit including means to vary said interval.

Claim 6

The combination of claim 1, said circuit means including a line cable, a plug at the end of said line cable connected to said switch and coil and components of said circuit means being mounted in said plug and electrically connected to said cable.

Claim 7

The combination of claim 1, said circuit means including means to energize the coil only during similar half cycles of alternating current supplied to said circuit, while said switch remains actuated.

Claim 8

In a portable tool, a housing, a load coil in said housing, work-engaging means including a magnetic member disposed adjacent said load coil, a switch means comprising first and second contacts and a switch member mounted for manual movement from normally unactuated position in engagement with the first contact into actuated position in engagement with the second contact, first and second leads adopted to be connected to a supply of alternating current, a first conductor connecting the first lead to one side of said load coil, a gated rectifier, a second conductor connecting the other side of said load coil with the anode side of said gated rectifier, a first diode, a third conductor connecting the cathode side of said gated rectifier with the anode side of said first diode, a fourth conductor connecting the cathode side of said first diode with said second lead, a first resistor interconnecting said fourth conductor with the gated leg of said gated rectifier, a fifth conductor connecting said third conductor with said second contact, a first capacitor, a sixth conductor connecting said switch member to one side of said first capacitor, a second resistor and a second diode connected in series with each other and with the other side of said first capacitor, a seventh conductor connecting the cathode side of said second diode with said first conductor, an eighth conductor connecting said first contact between said second resistor and said second diode, a third resistor connected in parallel across said first capacitor, a third diode in series with said load coil and located between said first lead and said gated rectifier, a fourth resistor and a second capacitor connected in series with each other, and in parallel with said series connected gated rectifier and first diode.

Claim 9

In a portable tool, a housing, a load coil in said housing, work-engaging means including a magnetic member disposed adjacent said load coil, a switch means comprising first and second contacts and a switch member mounted for manual movement from normally unactuated position in engagement with the first contact into actuated position in engagement with the second contact, first and second leads adopted to be connected to a supply of alternating current, a first conductor connecting the first lead to one side of said load coil, a gated rectifier, a second conductor connecting the other side of said load coil with the anode side of said gated rectifier, a first diode, a third conductor connecting the cathode side of said gated rectifier with the anode side of said first diode, a fourth conductor connecting the cathode side of said first diode with said second lead, a first resistor interconnecting said fourth conductor with the gated leg of said gated rectifier, a fifth conductor connecting said third conductor with said second contact, a first capacitor, a sixth conductor connecting said switch member to one side of said first capacitor, a second resistor and a second diode connected in series with each other and with the other side of said first capacitor, a seventh conductor connecting the cathode side of said second diode with said first conductor, an eighth conductor connecting said first contact between said second resistor and said second diode, a third resistor connected in parallel across said first capacitor, a third diode in series with said load coil and located between said first lead and said gated rectifier, a fourth resistor and a second capacitor connected in series with each other, and in parallel with said series connected gated rectifier and first diode.

Claim 10

The combination of claim 6, and a trigger means which will fire at a predetermined voltage, interposed in said fifth conductor.

Claim 11

The combination of claim 6, and a neon lamp interposed in said fifth conductor.

Claim 12

The combination of claim 6, said load coil, first and second contacts and switch member being located on said housing, an electrical connector fitting, said leads comprising terminals of said fitting, said gated rectifier, said first, second, third and fourth resistors, and said first, second and third diodes, and said first and second capacitors being located in said fitting, a cable connecting said fitting with said housing, and parts of said first, second, fifth, sixth and eighth conductors being disposed within said cable.

Claim 13

The combination of claim 1, said circuit means comprising said load coil and said switch, said switch comprising first and second contacts and a switch member normally engaging the first contact in unactuated position, but being manually movable out of engagement with respect to said first contact and into actuated position in engagement with said second contact; first and send leads adopted to be connected to said supply of alternating current, a gated rectifier, a first diode, means to connect said load coil, said gated rectifier and said first diode in series circuit with said leads, a first resistor connected to the gated leg of said gated rectifier and to one of said leads, conductor means connecting the second contact between said gated rectifier and said first diode, a first capacitor, a second resistor and a second diode connected in series with respect to each other, with said first capacitor connected to said switch member and said second diode connected to said other lead, a third resistor connected in parallel across said first capacitor, conductive means connecting said first contact between said second resistor and second diode, and a third resistor and a second capacitor connected in series with respect to each other and in parallel with said gated rectifier and first diode, and another diode in series with said load coil and located between said gated rectifier and said other lead.

Claim 14

The combination of claim 9, and a neon lamp interposed in said conductive means.

Claim 15

A tool comprising a load coil, work-engaging means including a magnetic member disposed adjacent said load coil, first and second contacts, a switch member normally in engagement with the first contact in the unactuated position of said switch member, said switch member being movable into engagement with the second contact in the actuated position of said switch member, a pair of leads connectable to a supply of alternating current, a gated rectifier, a first diode, means to connect said load coil, said gated rectifier and said first diode in series circuit across said leads, a first resistor connected to the gated leg of said gated rectifier and to one of said leads, conductor means connecting the second contact between said gated rectifier and said first diode, a first capacitor, a second resistor and a second diode connected in series circuit with respect to each other, with one side of said first capacitor connected to said switch member and one side of said second diode connected to said other lead, a third resistor connected in parallel across said first capacitor, conductive means connecting said first contact between said second resistor and second diode, a third resistor and a second capacitor connected in series with respect to each other and in parallel across said gated rectifier and first diode, and another diode in series with said load coil and located between said other lead and said gated rectifier.

Claim 16

A tool comprising a load coil, work-engaging means including a magnetic member disposed adjacent said load coil, first and second contacts, a switch member normally in engagement with the first contact in the unactuated position of said switch member, said switch member being movable into engagement with the second contact in the actuated position of said switch member, a pair of leads connectable to a supply of alternating current, a gated rectifier, a first diode, means to connect said load coil, said gated rectifier and said first diode in series circuit across said leads, a first resistor connected to the gated leg of said gated rectifier and to one of said leads, conductor means connecting the second contact between said gated rectifier and said first diode, a first capacitor, a second resistor and a second diode connected in series circuit with respect to each other, with one side of said first capacitor connected to said switch member and one side of said second diode connected to said other lead, a third resistor connected in parallel across said first capacitor, conductive means connecting said first contact between said second resistor and second diode, a third resistor and a second capacitor connected in series with respect to each other and in parallel across said gated rectifier and first diode, and another diode in series with said load coil and located between said other lead and said gated rectifier.

Claim 17

The combination of claim 12, and a trigger means which will fire at a predetermined voltage, interposed in said conductive means.

Claim 18

The combination of claim 12, and a neon lamp interposed in said conductive means.

Claim 19

A control circuit comprising a load coil, an alternating current supply, a controlled conduction means having a control electrode, circuit means connecting said load coil and said controlled conduction means in series with said curRent supply, switch means, control means controlled by said switch means for applying a signal to said control electrode to place said conduction means in a conductive state during a first predetermined poled half cycle of said alternating current supply after actuation of said switch means to energize said load coil during said half cycle, and means to automatically repeat said application of said signal to said control electrode to place said conductive means into a conductive state during such half cycles of said alternating current supply at predetermined intervals of time while said switch means remains in actuated condition, whereby to automatically and repeatedly energize said load coil at said predetermined intervals during such poled half cycles of said alternating current supply only, while said switch means remains in said actuated condition.

Claim 20

A control circuit comprising a load coil, an alternating current supply, a controlled conduction means having a control electrode, circuit means connecting said load coil and said controlled conduction means in series with said curRent supply, switch means, control means controlled by said switch means for applying a signal to said control electrode to place said conduction means in a conductive state during a first predetermined poled half cycle of said alternating current supply after actuation of said switch means to energize said load coil during said half cycle, and means to automatically repeat said application of said signal to said control electrode to place said conductive means into a conductive state during such half cycles of said alternating current supply at predetermined intervals of time while said switch means remains in actuated condition, whereby to automatically and repeatedly energize said load coil at said predetermined intervals during such poled half cycles of said alternating current supply only, while said switch means remains in said actuated condition.

Claim 21

The combination of claim 15, and means to prevent placing said conduction means in a conductive state until a predetermined voltage is reached in said circuit means.