IP Library › Granted Patent US 7,832,319
Granted Patent B2
US 7,832,319 · App. 12/009,804 · Granted Nov 16, 2010

Blade clamp assembly

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Quick Facts
Patent No.
US 7,832,319
App. No.
12/009,804
Granted
Nov 16, 2010
Kind
B2
Abstract

A blade clamp assembly for retaining a rotary blade on the arbor of a rotary tool includes a blade washer for engaging the blade to hold the blade on the arbor and a clamp assembly threaded into the arbor to clamp the blade washer against the blade. The clamp assembly includes a planetary gear system for transmitting torque applied to the clamp assembly to the blade washer, wherein the planetary gear system multiplies the torque transmitted to the blade washer so that the torque transmitted to the blade washer is greater than the torque applied to the clamp assembly.

Claims (10)

1. A blade clamp assembly for retaining a rotary blade on an arbor of a rotary tool, comprising:

a blade washer for engaging the blade to hold the blade on the arbor; and

a clamp assembly for being threaded into the arbor to clamp the blade washer against the blade, the clamp assembly including a body and a planetary gear system for transmitting torque applied to the clamp assembly to the blade washer, the planetary gear system including a sun gear and a planet gear,

a bolt assembly retained within the body, the bolt assembly including a carrier and a threaded bolt attached to an arbor-side of the carrier and extending through the body for coupling the clamp assembly to the arbor;

a cap coupled to the body, the sun gear attached to the cap and engaging the planet gear,

wherein, upon the cap being turned, the sun gear rotates the planet gear for turning the bolt assembly,

wherein the body includes a keyed bottom surface and the blade washer comprises a keyed upper surface for engaging the keyed bottom surface of the body, and

wherein the planetary gear system multiplies the torque transmitted to the blade washer so that the torque transmitted to the blade washer is greater than the torque applied to the clamp assembly.

2. The blade clamp assembly as claimed in claim 1 , wherein the body comprises a ring gear that engages the planet gear.

3. The blade clamp as claimed in claim 1 , further comprising a lever extending from the cap for increasing the amount of torque applied to the cap.