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Chain guard alarm apparatus

  • US 5,296,841 A
  • Filed: 09/21/1992
  • Issued: 03/22/1994
  • Est. Priority Date: 09/21/1992
  • Status: Expired due to Fees
First Claim
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1. A chain guard alarm apparatus comprisinga slot member having a slot portion and a pair of side panels,mounting means disposed on said slot member for mounting said slot member on a door,a slide member removeably engaged in said slot portion,a retainer member,mounting means disposed on said retainer member for mounting said retainer member on a door jamb,flexible chain means connecting said retainer member and said slide member,electrically operated alarm means mounted on said slot member,battery means mounted on said slot member,normally open switch means mounted on said slot member with said switch means being closed when said slide member is engaged in said slot portion and said door is opened,electrical connection means connecting said switch means, said battery means and said alarm means for activation of said alarm means responsive to said slide member closing said switch means as a result of said door being opened,with said switch means comprisinga slide block with said slide block slideably disposed between said side panels of said slot member,a conductive plate mounted on said slide member,a pair of electrical contacts mounted on said slot member, andhelical spring means mounted on said slide block and disposed to bias said slide block away from said electrical contacts until pressure applied to said slide block overcomes the bias of said helical spring means and brings said plate into contact with said electrical contacts thereby completing an electric circuit between said electrical contacts.

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