DE1240576B - Built-in switch for portable electrical tools - Google Patents

Description

DEUTSCHES '/ WWWt PATENTAMT

EDITORIAL

German class: 21 c - 30

Number: 1240 576

File number: S 75063 VIII d / 21 c

1 240 576 filing date: July 28, 1961

Open date: May 18, 1967

The invention relates to built-in switches for portable electrical tools with a split, molded or injection-molded insulating housing, which has insulating lugs arranged at a distance from one another, which are firmly connected to the housing or formed in one piece with it and conductive connections wear, which form fixed switching contacts, and influenced by a spring electroconductive ball, which is carried by a movable trigger element, to the electroconductive Bridging or disconnecting connections.

In known designs of this type, the conductive connections forming the stationary contacts are used massive plugs that are inserted into corresponding holes. For such massive connector ends however, a relatively large amount of contact metal is required, which increases the cost of the switch.

In contrast, the purpose of the invention is to create a switch of the type mentioned in the introduction, in which the ao connections forming the contacts are formed with minimal effort.

According to the invention, a built-in switch of the type mentioned is characterized by three mandrel-shaped ones Approaches that protrude inward from one half of the housing and of which two approaches as Support for push-on sleeve connections attached to the ends of wire conductors are used, so that they form fixed contacts for the ball, while the third approach the ball in the open position defines, and by known guide and stop means for the trigger element.

Because the connections forming the contacts are designed as sleeves, only one is required for comparison small amount of contact metal to be used as the bulk of the contact body is made up cheap but strong molded plastic material is formed. This can reduce the cost of such Built-in switches are reduced.

In the drawing, an embodiment of the invention is shown, for example.

F i g. 1 is a vertical side view of a portable electric tool, partially broken away is to show the internal switch structure according to the invention;

FIG. 2 is a partial view of the tool of FIG. 1 partially in section through the trigger element;

F i g. 3 is a sectional view taken along line 3-3 of FIG.

According to FIG. 1, 10 and 11 are the two molded or injection-molded halves of a vertically slotted insulated housing for a built-in switch for portable devices
electric tools

Applicant:

The Singer Company, Elizabeth, NJ (V. St. A.)
Representative:

Dr. E. Wiegand and Dipl.-Ing. W. Niemann,
Patent Attorneys, Hamburg 50, Königstr. 28

Named as inventor:
Reynold Happe ₃

Joseph Pasquale Yelpo, Greenville, SC
(V. St. A.)

Claimed priority:

V. St. v. America August 2, 1960 (47 099)

portable electric drill of conventional type. The top or front half part is cut out around the reproduce internal switch structure according to the invention.

With the lower shaped half 10 , spaced apart, protruding lugs 12, 13 and 14 are integrally formed or firmly connected (FIG. 2). A wire lead 15 connected to a drive motor (not shown) is attached to a slotted conductive terminal 16 which is pressed onto the boss 13 , as best shown in FIG. 3 is shown. A wire line 17, which forms one of the feed lines of the outer cable 18 , is attached to the slotted conductive end connection 19 which is pressed onto the lug 12. The connections 16 and 19 form the fixed contacts of the switch. The approach 14 is left without a conductive coating.

An isolated trigger element 20 is provided with a pocket 21 which has a countersunk bore 22 into which a spring 23 is inserted. A conductive ball 24 is carried by the free end of the spring 23 which is thereby pressed against the lugs 12, 13 and 14 , as best shown in FIG. 2 is shown.

A compression spring 25, which is carried within a bore 26 in the trigger element 20 , sits within a pocket 27 which is formed in an abutment part 28 which is connected to the housing half 10.

709 580/196

Claims (1)

lumpy or firmly connected. The spring 25 pushes the trigger element 20 into the position shown in FIG. 1, the position in which the ball 24 is in a position between the conductive connection 16 and the extension 14 that is not covered. This is the "open" or "off" position of the switch. When the operator presses the trigger element 20 inwards, it slides into the position shown in FIG. 2, whereby it is guided through parts 29 and 30 which are formed on the housing 10 until the end 31 of the trigger element 20 abuts against the abutment 28 . The parts 29 and 30 also serve as an abutment for projections 32 and 33 on the trigger element 20 to prevent its movement to the right when viewing the Fi g. 2 limit. It can be seen that the upper or front housing half 11 is provided with symmetrical parts which, in the assembled state , fit together with those parts 28, 29 and 30 of the rear half 10 to form guide and stop means for the trigger element 20 , which is on this Way is kept slidable for limited movement between them. In the in F i g. In the position shown in FIG. 2, the ball 24 is in bridging contact with the conductive connections 16 and 19, and this is the "closed" or "on" position of the switch. In the transition between the in the F i g. 1 and 2, the ball 24 compresses the spring 23 and slides and / or rolls around the connection 16 into its new position, in which it enters with a snap action due to the distance between the spring 23 and the pocket 21. From the above it can be seen that with the invention a built-in switch assembly for a electric tool is created, which advantageously the insulating housing of the tool for some which takes advantage of switch parts to gain extremely great ease of assembly with a consequent low cost. An essential feature of this design is the double use of connections 16 and 19 as line connectors and also as switching contacts. Claim: ίο Built-in switch for portable electrical tools with a divided, molded or injection-molded insulating housing, which has insulating lugs arranged at a distance from one another, which are permanently connected to the housing or formed in one piece with it and carry conductive connections that form fixed switching contacts, and with one of one Spring-influenced electroconductive ball, which is carried by a movable trigger element in order to prevent the electroconductive zo to bridge or separate the connections, characterized by three thorn-shaped approaches (12, 13, 14), which protrude from one half (10) of the housing inward and of which two approaches (12, 13) as a carrier for slide-on the ends of wire conductors (15, 17) attached sleeve connections (16, 19) serve so that they form fixed contacts for the ball (24) , while the third extension (14) fixes the ball in the open position, and through known guide and stop means (28 to 33) for the trigger element (20). Considered publications:
French patent specification No. 961 385. Legacy Patents Considered:
German Patent No. 1 122 606. 1 sheet of drawings