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Modular cordless tools

  • US 4,050,003 A
  • Filed: 02/18/1976
  • Issued: 09/20/1977
  • Est. Priority Date: 08/23/1974
  • Status: Expired due to Term
First Claim
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1. A modular, cordless electric tool assembly comprising a power handle module having an enclosing casing, said casing forming a four-sided closed loop about a central opening, one of said sides being configured to provide a hand grip, a plurality of battery cells enclosed within said casing, switch means comprising an electric switch mounted within said casing and a switch operator extending externally of said casing within said closed loop for engagement and manipulation by an operator having his hand in place on said hand grip, a second side of said power handle being provided with a plurality of exposed electrical contacts, means internally of said casing connecting said contacts with said battery cells, a longitudinally extending pilot surface on said second side of said power handle;

  • a tool head module including a housing, output means on said housing, one side of said housing having electrical contact means exposed thereon for interengagement with said electrical contacts on said power handle, a pilot region exposed in said one side of said tool head housing for engaging said pilot surface on said power handle; and

    complementary male and female interconnection means provided respectively on said second side of said power handle and on said one side of said tool-housing permitting sliding interengagement and disengagement of said power handle and said tool head, said tool head module being stably connected mechanically to said power handle module and electrically connected to said batteries when said power handle and said tool head are engaged.

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