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Mechanism for mounting a disk-shaped attachment on the spindle of a portable electric tool

  • US 4,779,382 A
  • Filed: 07/10/1987
  • Issued: 10/25/1988
  • Est. Priority Date: 07/12/1986
  • Status: Expired due to Fees
First Claim
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1. Mechanism for mounting a disk-shaped attachment on a motor-driven spindle that is accommodated in the drive-mechanism housing of a portable electric tool, especially for mounting a sanding disk on a right-angled grinder, with a tensioning anchor that slides back and forth but cannot rotate inside the spindle, which is in the form of a sleeve, and that extends beyond the attachment end of the spindle, with a tensioning flange that is secured to and can be released from the free end of the tensioning anchor, with a support that is located at the attachment end of the spindle, and with an activating mechanism for forcing the tensioning flange against the support with the attachment clamped between them and for releasing them, characterized in that the tensioning anchor (22) and the spindle (18) each have a demarcating surface (34 &

  • 36) that face each other axially separated inside the spindle (18) in the form of a sleeve and jointly define a space (39) that communicates with another space (44) in the tensioning anchor (22) or in the spindle (18), in that a piston (46) that slides back and forth when the volume of the space is varied by the activating mechanism and that can be secured in at least one position is accommodated in the second space (44), and in that the spaces (39 &

         44) are full of a plastic material (0) that can transmit force hydraulically.

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