Portable electric tool

• US 4,381,037 A
• Filed: 10/28/1980
• Issued: 04/26/1983
• Est. Priority Date: 10/29/1979
• Status: Expired due to Term

• Current Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Cuneo, Giuseppe
• Primary Examiner(s): Smith, James G.
• Assistant Examiner(s): Adolphson, K. Bradford
• Application Number:
  US06/201,553
• Time in Patent Office: 910 Days
• Field of Search: 173/170, 83/DIG. 1, 408/710, 200/157, 200/321, 200/334
• US Class Current: 173/170
• CPC Class Codes: B23B 45/02 driven by electric power
• CPC Class Codes: B25D 11/00 Portable percussive tools with electromotor or other motor drive
• CPC Class Codes: B25D 17/04 Handles; Handle mountings
• CPC Class Codes: B25D 2250/265 Trigger mechanism in handle
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence
• CPC Class Codes: B25F 5/026 in the form of an auxiliary handle B25F5/024 takes precedence
• CPC Class Codes: H01H 9/06 Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
• CPC Class Codes: Y10S 408/71 Safety device

Abstract

An alternate switch actuating mechanism for an electric drill or similar tool which permits the tool to be used in either a portable or stationary operation. The tool has a first handle that includes a first switch actuator for operating the tool and a second detachable handle which carries a second actuator for the switch. The second actuator is constructed so as to directly engage the first actuator to permit simplicity of operation and ease of disassembly for stationary operation. A lock is provided for precluding accidental actuation of the second actuator. The device also includes a reversing switch and an interlock which prevents actuation of the reversing switch when the drill is energized.

Claims

1. In a portable electric drill, hammer drill or hammer having a housing, a first handle arranged on the housing, an electric switch for energizing the drill, a second elongated handle detachably mounted to the housing, and an arrangement for actuating the switch, the arrangement comprising:

a first lever mounted in said first handle to act on said switch, said first lever having a first portion directly engaging said switch and being pivotally mounted on the first handle for movement between first and second positions corresponding to the off and on conditions of the switch;

a second lever mounted on said second elongated handle transversely to said first lever, said second lever having an engaging portion positioned to directly engage said first lever;

said first lever having a second portion to engage said engaging portion of said second lever, said first and second portions of said first lever being spaced from each other with the fulcrum of said first lever therebetween;

said second lever being pivotally mounted within said second elongated handle whereby said engaging portion acts upon said first lever to cause the latter to move from said first position to said second position in response to a pivotal movement of said second lever;

said elongate handle having an opening therein through which an end portion of said second lever projects when said second lever is in its disengaged position for actuation by the hand of an operator;

a hand grip slidably supported on said projecting end portion for operation of said second lever by the operator;

biasing means for biasing said hand grip in an extended position; and

said hand grip and said elongated handle having cooperating detent means when said hand grip is in its extended position for precluding accidental actuation of said second lever, said hand grip being slidable relative to said second lever in opposition to the actuation of said biasing means for freeing said detent means from engagement with each other whereby said second lever may be actuated.

2. A portable electric drill, hammer drill or hammer as set forth in claim 1 wherein the operative connection between the second lever engaging portion and the first lever is such that removal of the elongated handle will disconnect the operative connection without further action.

3. A portable electric drill, hammer drill or hammer as set forth in claim 2 wherein the elongated handle has a second opening in registry with an opening in the drill housing when said elongated handle is connected thereto, the second lever engaging portion extending through said second opening for engagement with said second portion of the first lever, said opening through which said end portion projects facing in a forward direction when said elongated handle is attached to said drill housing.

4. A portable electric drill, hammer drill or hammer as set forth in claim 1, further including a reversing switch for reversing the direction of rotation of the drill and interlock means for precluding actuation of said reversing switch when said drill is energized.

5. A portable electric drill, hammer drill or hammer as set forth in claim 4 wherein the interlock means cooperates with the first lever when said first lever is in its second position for precluding actuation of the reversing switch.

6. A portable electric drill, hammer drill or hammer as set forth in claim 5 wherein the reversing switch has an actuator, the interlock means including an element carried by said reversing switch actuator and having a first portion adapted to cooperate with a surface of the first lever for precluding movement of said reversing switch actuator when said reversing switch is in a first of its positions, said element having a second portion adapted to cooperate with said surface of said first lever when the reversing switch is in the other of its positions for precluding movement of said reversing switch actuator.

7. A portable electric drill, hammer drill or hammer as set forth in claim 6 wherein the elongated handle has a second opening in registry with an opening in the drill housing when said elongated handle is connected thereto, the second lever engaging portion extending through said second opening for engagement with said second portion of the first lever.