Trigger switch with latch and vernier speed adjusting shaft

Claim 2

In a trigger switch the combination comprising a housing; a spring-biased trigger slidable mounted for a slidable movement on the housing and having a recessed wall portion a lock pin mounted on the housing; the improvement comprising: vernier adjusting means and means mounting it in the trigger comprising: an adjustable block having a catch in removable engagement with the lock pin; a shaft threaded through said block, carried by said trigger and having a rear end abutting and rotatable on said recessed wall portion to take up the force of the trigger return spring when the lock is engaged in said catch; and an adjusting wheel on the forward end of said shaft for rotating said shaft to adjust the position of the trigger relative to said block.

Claim 3

The invention defined in claim 1, wherein said means mounting said vernier adjusting means in the trigger comprises: a recess in the trigger providing space for forward-rearward movement of said block; a transverse slot spaced forwardly of said recess for accommodating said adjusting wheel; and a hole between said recess and said slot through which said shaft extends.

Claim 4

The invention defined in claim 2 wherein: said adjusting wheel is provided with a mounting hole at its center and saiD shaft is provided with a complementary forward end received snugly and non-rotatably in said mounting hole to afford rotation of said shaft by said adjusting wheel.

Claim 5

The invention defined in claim 3, wherein: peripheral portions of said adjusting wheel stick out from opposite sides of said trigger for rotation by the user.

Claim 6

A self-enclosed variable speed trigger switch adapted for mounting in the handle of a portable electric tool comprising: an insulating housing for enclosing the speed control circuit; a trigger; a frame mounting said trigger for sliding movement along said housing to operate the speed control circuit therein; a spring biasing said trigger into its extended ''''off'''' position from which it is depressed by the forefinger of the user into its ''''on'''' position; a spring-biased lock pin mounted on said frame accessible to the thumb of the user; and speed adjusting means comprising: a recess in said trigger having a rear wall; a catch block within said recess and having a catch in movable engagement with said lock pin; a stop shaft threaded through said catch block and having a rear end abutting said rear wall and rotatable thereon; a transverse slot in said trigger; a rotary wheel in said slot with its opposite sides extending outside thereof for rotation by the user; and a hole between said recess and said slot through which said shaft extends into non-rotary engagement with said wheel.

Claim 7

A self-enclosed variable speed trigger switch adapted for mounting in the handle of a portable electric tool comprising: an insulating housing for enclosing the speed control circuit; a trigger; a frame mounting said trigger for sliding movement along said housing to operate the speed control circuit therein; a spring biasing said trigger into its extended ''''off'''' position from which it is depressed by the forefinger of the user into its ''''on'''' position; a spring-biased lock pin mounted on said frame accessible to the thumb of the user; and speed adjusting means comprising: a recess in said trigger having a rear wall; a catch block within said recess and having a catch in movable engagement with said lock pin; a stop shaft threaded through said catch block and having a rear end abutting said rear wall and rotatable thereon; a transverse slot in said trigger; a rotary wheel in said slot with its opposite sides extending outside thereof for rotation by the user; and a hole between said recess and said slot through which said shaft extends into non-rotary engagement with said wheel.