Drum, rim grip braking device

Claim 1

A braking device comprising a brake drum supported on a mounting base and having a flange, inner and outer brake shoes arranged for engagement with the inner and outer surfaces of the flange of said brake drum, means for bearing braking force generated by engagement of said flange and said inner and outer shoes, said bearing means having one end portion connected with said inner and outer shoes and the other end portion connected with said mounting base, means for generating force which brings said inner and outer shoes into and out of engagement with said flange including electromagnetic means with spring means, said force generating means forming a part of said bearing means, and means for transmitting the force generated by said force generating means to said inner and outer shoes, said electromagnetic means including an electromagnet having an integral projection extending downwardly from the lower side thereof and pivotally connected with a bearing on a mounting base and an integral post extending upwardly from the upper side thereof and having said outer brake shoe rockably connected to the inner face thereof through a spherical joint; said transmitting means including an operating lever having its lower end held in contact with a movable core of said electromagnet, its intermediate portion connected with an outer shell of said electromagnet and its upper end rockably connected to the outer face of said post through a spherical joint at a location above the spherical joint between said post and said outer brake shoe, a supporting member having a substantially U-shape so as to accommodate said inner brake shoe, said outer brake shoe and said post between the two arms thereof and rockably supporting said inner shoe by one of said arms, with the other arm connected to said operating lever, and a link having one end pivotably connected with electromagnet and the other end pivotably connected with the inner shoe supporting arm of said supporting member.