US2405827A

US2405827A - Portable electric tool

Info

Publication number: US2405827A
Application number: US572372A
Authority: US
Inventors: Happe Reynold
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1945-01-11
Filing date: 1945-01-11
Publication date: 1946-08-13
Anticipated expiration: 1963-08-13

Description

Aug. 13, 1946. a; HAPPE I PORTABLE ELECTRIC TOOL Filed Jan. 11, 1945 Patented Aug. 13, 1946 7 2,405,827 PORTABLE ELECTRIC TOOL Reynold Happe, Pittstown, N. J.,

Singer Manufacturing Company,

assignor to The Elizabeth,

N. J a corporation of New Jersey Application January 11, 1945, Serial No. 572,372

Claims. (Cl. 172-36) This invention relates to a portable electric tool of the kind including a motor housing and having a hollow handle in which is mounted the control switch for the circuit leads to a motor enclosed within the housing.

The primary object of the invention is to provide a portable tool of this kind having an improved switch unit adapted for complete assembly apart from the tool and for ready insertion into the handle without requiring any circuit or other connections to be manually made therein.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and th advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawing Fig. l is a partially-sectioned, side elevation of the rear end of a tool incorporating the present invention;

Fig. 2 is a partially-sectioned, rear elevation of the tool;

Fig. 3 is a broken-out front elevation of the rear portion of the tool;

Fig. 4 is a bottom plan view of the handle; and

Fig. 5 is a perspective view of the mounting plate portion of the switch unit.

The tool comprises a motor housing, generally designated l, which merges into a depending handle, generally designated 2. The handle is hollow and open across the bottom or butt end; and extending centrally up the front wall 3 of the handle is a slot 4 which forms a continuation of the bottom opening of the handle. Within the housing I is an electric motor unit, a portion of which is indicated at 5; and depending from the unit adjacent the upper end of the handle cavity are two motor circuit contacts 6 and l.

The bottom or open end of the handle 2 is adapted to be closed by an apertured plate, generally designed 8, which may be secured to the handle walls by screws 9. The closure plate 8 is provided at one end with an upstanding wall portion H! which is adapted to fit and close the lower part of the slot 4 in the front wall 3 of the handle. The wall portion in is channelled, as at H, and immediately behind the wall portion is formed a stepped block 12. As will be recognized, the whole closure plate structure 8 can readily be cast or molded in one piece.

Pivoted on a stud iii in the channel H i a switch trigger M, the upper portion of which is normally projected outwardly over the top of the wall portion In of the closure plate and substantially closes the upper portion of the handle slot 4. Immediately behind and engaging the switch trigger I4 is the toggle arm ii of a switch it upstanding from and secured to the block [2. The switch and switch trigger are thus supported on the closure plate quite independently of the handle.

At the upper end of the switch It, and positioned to engage the motor unit contacts-8 and 1 when the switch unit is inserted in the handle, are contacts H and I8; and at the lower end of the switch are binding screws I9, 20 for circuit leads 2!, 22, respectively, of cable 23. The cable 23 is brought into the handle through the aperture 24 in the closure plate 8 and it, too, is secured to the plate, as by ground clamp 25 and

screws

26, 21; the screw 26 serving also as a binding screw for the ground wire 28.

The simplicity and advantages of the construction from the standpoint of manufacture as well as assembly will be apparent. Not only may the entire switch, trigger and cable unit be assembled on the closure plate quite apart from the handle, but no connections whatever are required to be made beyond the mere insertion of the unit into the handle and the insertion of screws 9; and, in addition, the plate and handle are so organized as to provide an integrated structure which is both compact and extremely rugged.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a portable tool including a motor housing, an electric motor unit therein, a handle having a cavity open across the butt end and up the center only of the front of the handle, the upper end of the cavity communicating with the motor housing, motor circuit contacts carried by the motor unit and located adjacent the said upper end of the handle cavity, an apertured plate adapted to be secured to the butt end of the handle to close the end of said cavity and having a channel, upstanding wall portion forming a partial closure for the front opening of the handle, a ivoted switch trigger mounted on the plate in the channel thereof independently of the handle, said trigger normally projecting over said wall portion of the plate for external operation and substantially closing the remainder of the front opening of the handle, a trigger-controlled switch likewise mounted on the plate independently of the handle and having circuit contacts located to engage the said motor circuit contacts,

a cable extendin through the plate aperture with its leads connected to the switch, and a clamp se curing the cable to the closure plate.

2. In a portable tool including a motor housing, an electric motor unit therein, a handle having a cavity open across the butt end and up the front of the handle, the upper end of the cavity communicating with the motor housing,'motor circuit contacts carried by the motor unit and located adjacent the said upper end of the handle cavity, an apertured plate adapted to be secured to the butt end of the handle to close the end of said cavity and having an upstanding wall portion forming a partial closure for the front opening of the handle, a pivoted switch trigger mounted on the plate independently of the handle, said trigger normally projecting over said wall portion of the plate for external operation and substantially closing the remainder of the front opening of the handle, a trigger-controlled switch likewise mounted on the plate independently of the handle and having circuit contacts located to engage the said motor circuit contacts, a cable extending through the plate aperture with its leads connected to the switch, and a clamp securing the cable to the closure plate.

3. In a portable tool including a motor hous ing, an electric motor unit therein, a hollow handle having a bottom opening and a front opening, the upper end of the cavity communieating with the motor housing, motor circuit contacts carried by the motor unit and located adjacent the said upper end of the handle cavity, an apertured plate adapted to be secured to the butt end of the handle to close the bottom opening of said cavity, a pivoted switch trigger mounted on the plate independently of the handle, said trigger normally projecting through the said front opening for external operation, a triggercontrolled switch likewise mounted on the plate independently of the handle and having circuit contacts located to engage the said motor circuit contacts, a cable extending through the plate aperture with its leads connected to the switch and means securing the cable to the closure plate.

4. In a portable tool including a motor housing, an electric motor unit therein, a hollow handle having a cavity open across the butt end thereof, the upper end of the cavity communieating with the motor housing, motor circuit contact carried by the motor unit and having a fixed location adjacent the said upper end of the handle cavity, a plate secured to the butt end of the handle to close the butt end opening of the cavity, a switch-actuating member mounted on the plate independently of the handle, and a switch likewise mounted on the plate independently of the handle and having fixed circuit contacts so located as to be brought into engagement with said motor circuit contacts by the insertion of said switch into said handle.

5. In a portable tool, a hollow handle open at the butt end thereof, a front wall of the handle having a slot running substantially throughout its length and forming a continuation of the butt end opening, a closure plate for the said butt end opening having an upstanding wall portion adapted to close the lower portion of said slot, and a switch unit secured to the plate within and independently of the handle and incorporating a switch-actuating member normally projecting outwardly through and substantially closing the upper portion of the said slot.

REYN OLD I'IAPPE.