Lifting clamp for a wheel of an overhead crane

Abstract

A crane wheel lifting device for suspending a crane wheel with a rim, comprising a lower fastener, an upper fastener, a bolt, and a spring. The lower fastener has a groove for inserting the rim; the upper fastener has a hanging portion, a pressing portion, and an elongated groove, the pressing portion abutting against the rim; the bolt passes through the elongated groove and is locked to the lower fastener, allowing the lower fastener to move relative to the upper fastener along the elongated groove; the spring is housed in the elongated groove and pushes the lower fastener to a normal position. Because the hanging portion and the pressing portion are located on opposite sides of the bolt axis, when the crane wheel is lifted, the weight of the crane wheel drives the lower fastener to move, causing the pressing portion and the groove to clamp the rim; upon unloading, the fastener automatically releases.

Claims

1. A crane wheel lifting device for suspending a crane wheel, the crane wheel having a flange portion, comprising: A lower fastener has a pivot hole and a recessed groove formed from the side for inserting the wheel rim portion; an upper fastener is pivotally connected to the lower fastener and has a hanging portion, a pressing portion, and an elongated groove. The hanging portion is located at the top of the upper fastener for connecting a lifting rope. The pressing portion is located at the bottom of the upper fastener and faces the groove, thus defining a space for clamping the wheel rim portion together with the groove; a bolt passes through the pivot hole of the lower fastener and the elongated groove of the upper fastener and is locked to the lower fastener, allowing the lower fastener to move relative to the upper fastener along the elongated groove via the bolt, thereby changing the distance between the groove and the pressing portion to clamp or release the wheel rim portion; and a spring is housed in the elongated groove and pushes against the bolt at one end, keeping the lower fastener in a normal position relative to the upper fastener.

2. The crane wheel lifting device as claimed in claim 1, wherein when the lifting rope applies tension to the suspension part to lift the crane wheel, the weight of the crane wheel drives the lower fastener to displace relative to the upper fastener, reducing the distance between the groove and the pressing part to a clamping position; when the tension of the lifting rope on the suspension part is released, the spring pushes the lower fastener back to the normal position via the bolt, causing the pressing part to move away from the groove and releasing the wheel flange.

3. The crane wheel lifting device as claimed in claim 1, wherein the lower fastener includes a first side plate and a second side plate spaced apart and arranged side by side, and a spacer clamped and engaged between the first side plate and the second side plate, and the bolt passes through the first side plate and the second side plate.

4. The crane wheel lifting device as claimed in claim 3, wherein the first side plate and the second side plate each have the groove.

5. The crane wheel lifting device as claimed in claim 3, wherein the spacer is fixed to the first side plate and the second side plate by welding.

6. The crane wheel lifting device as claimed in claim 1, wherein the elongated slot is an elongated hole extending along the length direction of the upper fastener.

7. The crane wheel lifting device as claimed in claim 1, wherein one end of the spring abuts against the bolt body and the other end abuts against the groove wall of the elongated slot.

8. The crane wheel lifting device as claimed in claim 1, wherein the opening of the groove matches the thickness of the rim portion of the crane wheel.

9. The crane wheel lifting device as claimed in claim 1, wherein the lifting part is a lifting hole through which the lifting rope passes.

10. The crane wheel lifting device as claimed in claim 7, wherein the spring has a wire diameter of at least 2 mm and a free length range of 50 to 70 mm.

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