Blade clamping device
AssigneePositec Power Tools (Suzhou) Co., Ltd.
InventorSang Shuhua
Life of this patent
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Abstract
The present invention relates to a quick-change saw blade clamping device which includes an output shaft, a cylindrical rotatable sleeve and a torsion spring. The output shaft is coupled to a blade carrier which is disposed within the cylindrical rotatable sleeve. A rotatable member is disposed within the cylindrical rotatable sleeve. A locking member pivotally connected to the blade carrier lies in a guide groove which is formed on the blade carrier. A spiral surface is formed on the front end of the rotatable member. When the cylindrical rotatable sleeve is manually rotated, the spiral surface urges the locking member to press the blade into a locking position. The present invention provides an easily-operated clamping device of simple structure and small size.
Claims21
A blade clamping device for clamping a blade comprising:
- a cylindrical rotatable sleeve having a proximal end in which is formed an aperture for a blade;
- a rotatable member mounted substantially coaxially within the cylindrical rotatable sleeve and having a proximal end;
- a blade carrier disposed within the cylindrical rotatable sleeve and having a proximal end in which is formed a blade receiving slot for the blade and a distal end;
- an output shaft coupled to the distal end of the blade carrier;
- a torsion spring for biassing the clamping device from a non-clamping configuration in which the blade is insertable into the blade carrier to a clamping configuration in which the blade is able to be clamped in the blade carrier;
- a guide groove radially and axially extending from an exterior surface of the blade carrier (4) and communicating with the blade receiving slot;
- a locking member pivotally mounted in the guide groove on a pin;
- and
- a spiral surface disposed at the proximal end of the rotatable member,
- wherein the cylindrical rotatable sleeve is manipulable rotationally to the non-clamping configuration whereat the aperture is aligned with the blade receiving slot for inserting the blade into the blade carrier and wherefrom the cylindrical rotatable sleeve is biased back to the clamping configuration by the torsion spring whereat the aperture is non-aligned with the blade receiving slot so as to cause said proximal end of said rotatable sleeve to engage the blade and the spiral surface positively engages a curved surface of the locking member giving the locking member a tendency to rotate about the pin thereby causing the locking member to positively engage the blade in the blade carrier.
A quick-change saw blade clamping device comprising an output shaft, a rotatable sleeve, a rotatable member and a torsion spring, said output shaft is coupled to a blade carrier which is disposed within said rotatable sleeve, a blade receiving slot is formed on a front end of said blade carrier, an aperture is formed on a front end portion of said rotatable sleeve, wherein said rotatable sleeve is rotatable between a position in which said aperture and said blade receiving slot are aligned to allow a blade to be extended therethrough and a position in which said aperture and said blade receiving slot are non-aligned to cause a blade extending therethrough to engage said front end portion of said rotatable sleeve, characterized in that said rotatable member is integrally mounted to and disposed within said rotatable sleeve, a guide groove radially and axially extending from an outer surface of said blade carrier and communicating with said blade receiving slot, a locking member is pivotally connected to said blade carrier and disposed in said guide groove, a spiral surface is disposed at a front head end of said rotatable member, under a state in which a blade clamped in a locking position, said spiral surface presses against the rear side surface of said locking member.
Dependencies are inferred from the claim text.