US 5,605,268 A · Portable motor-driven staple machine

Abstract

A portable motor-driven staple machine comprises: a trigger operation detecting switch 5 which is turned on and off by a trigger lever 3; a contact detecting switch 25 which is turned on and off by a contact arm 23; a cycle completion detecting switch 21 which is turned on and off by a plunger 17; and a mode change-over switch for selecting a single cycle operation mode or a continuous operation mode. Those switches are connected to a control circuit 26. When the trigger lever 3 is operated with the contact detecting switch 25 in "off" state, a timer section in the control circuit 26 counts clock pulses so that when it is detected that a predetermined period of time has passed, the switch "on" signal of the trigger operation detecting switch 5 is cut off. In the case where the continuous operation mode is selected, an automatic power interrupting function is released, so that the motor 7 is continuously driven; that is, staples are continuously driven into the object until the trigger operation detecting switch 5 or the contact detecting switch 25 is turned off.

Claims4

Dependent claims

A portable motor-driven staple machine for driving a staple into an object, said portable motor-driven staple machine comprising:

a staple shot outlet;
a detection section for detecting the contact of said staple shot outlet with the object;
a trigger lever;
an electric actuator operated to discharge the staple;
one of a mechanical safety mechanism and an AND circuit allowing said electric actuator to discharge the staple when said staple shot outlet contacts the object and when said trigger lever is operated;
a timer for starting a time measuring operation when said trigger lever is operated while said staple shot outlet is not in contact with the object;
means for comparing a predetermined reference time period with a time period measured by said timer;
means for cutting off a switch "on" signal of said trigger lever and resetting said measured value of said timer when the time period measured by said timer reaches said predetermined reference time period;
an automatic power interrupting means for interrupting the application of power to said electric actuator every operation cycle thereof;
means for controlling said automatic power interrupting means;
and
a mode change-over switch for selecting a single cycle operation mode or a continuous operation mode,
wherein said automatic power interrupting means disabled by operating said mode change-over switch.

10 more elements

Dependencies are inferred from the claim text.

Portable motor-driven staple machine

Life of this patent

Portable motor-driven staple machine

Life of this patent

Abstract

Claims4