TOOL FREE BOLT SYSTEM FOR A SAW BLADE

摘要

A bolt assembly (100) enables a user to change a circular blade (160) on a power tool (200) without the use of tools. The bolt assembly includes a bolt body (110) that has a bolt head (132) and a shank (136) that extends axially from the bolt head. The bolt head has a shoulder and the shank has external threads that mate with a threaded bore (220) of a drive shaft (212) of the power tool. A grip body (130) is formed circumferentially around the bolt head to facilitate rotation of the bolt body by the user's hand. An upper washer (114), a needle roller thrust bearing (116), and a lower washer (118) are positioned on the bolt head and retained with a retaining clip (120). The bolt body is rotated to press the lower washer against a clamping surface of the circular blade. The bolt assembly permits rotation of the lower washer relative to the bolt body without rotating the bold body.

主权项

1. A bolt assembly for securing a tool disc to a power tool, comprising:
a bolt body having a bolt head and a shank extending axially from the bolt head, the bolt head having a bearing surface that faces the shank and the shank having external threads that are matably receivable in a threaded bore of a shaft of the power tool; a grip body extending radially from and circumferentially about the bolt head, the grip body being configured to rotate the bolt body; a lower washer positioned between the bearing surface and the shank, the lower washer being rotatable about the bolt head and having a contact surface configured to be pressed against a clamping surface of the tool disc; and a bearing positioned between the bearing surface and the lower washer, the bearing being configured to allow the lower washer to rotate relative to the bolt body without rotation of the bolt body.