LIFT PIN AND DIE
A lift pin may include a head, a retainer and a shaft disposed between the head and the retainer. The shaft may include first and second portions and a step disposed therebetween. The first and second portions may include first and second diameters, respectively. The first diameter may be larger than the second diameter. The head may be disposed on an end of the first portion opposite the step and may include a third diameter that is larger than the first diameter. The second portion may be disposed between the first portion and the retainer. The retainer may be attached to the shaft and may be movable in a radial direction relative to the shaft between first and second positions.
1 . An assembly comprising:
a lift pin including a shaft, a head and a retainer, the shaft including first, second and third portions having first, second and third diameters, respectively, the second diameter being larger than the third diameter and smaller than the first diameter, the second portion disposed between the first and third portions, the head disposed on an end of the first portion and having a fourth diameter that is larger than the first diameter, the retainer disposed about the third portion and movable relative to the third portion between concentric and eccentric positions; and
a tool including a body and first and second studs extending from the body, the first stud including a first bore sized to receive the first portion of the shaft, the second stud including a second bore having first and second inner diametrical surfaces and a step between the first and second inner diametrical surfaces, the first inner diametrical surface being sized to receive the first portion of the shaft, the second inner diametrical surface being sized to receive the second portion of the shaft and prevent passage of the first portion of the shaft therethrough.
2 . The assembly of claim 1 , further comprising first and second bushings received in the first and second studs, wherein the first and second bushings define the first and second bores, respectively.
3 . The assembly of claim 2 , wherein the first and second studs are cast around the first and second bushings.
4 . The assembly of claim 1 , wherein a diameter of the second inner diametrical surface of the second bore is smaller than the first diameter of the first portion of the shaft.
5 . The assembly of claim 1 , wherein a diameter of the first bore is smaller than the fourth diameter of the head of the lift pin.
6 . The assembly of claim 1 , wherein the first and second studs are spaced apart from each other.
7 . The assembly of claim 1 , wherein the lift pin includes a spring disposed between the retainer and the third portion and biasing the retainer toward the eccentric position.
8 . The assembly of claim 7 , wherein the spring has a spiral shape.
9 . The assembly of claim 1 , wherein the lift pin includes a nut threadably engaging the third portion and restricting axial movement of the retainer relative to the shaft.
10 . The assembly of claim 1 , wherein the tool is a stamping die.
11 . The assembly of claim 1 , further comprising a hoist and a chain extending from the hoist and engaging the first portion of the shaft between the first and second studs.
12 . A lift pin comprising a head, a retainer and a shaft disposed between the head and the retainer, the shaft including first and second portions and a step disposed therebetween, the first and second portions having first and second diameters, respectively, the first diameter being larger than the second diameter, the head disposed on an end of the first portion opposite the step and having a third diameter that is larger than the first diameter, the second portion disposed between the first portion and the retainer, the retainer attached to the shaft and movable in a radial direction relative to the shaft between first and second positions.
13 . The lift pin of claim 12 , wherein the shaft includes a third portion having a fourth diameter that is smaller than the second diameter.
14 . The lift pin of claim 13 , wherein the retainer is disposed about the third portion and is concentric with the third portion in the first position and eccentric relative to the third portion in the second position.
15 . The lift pin of claim 14 , further comprising a spring disposed between the retainer and the third portion and biasing the retainer toward the second position.
16 . The lift pin of claim 15 , wherein the spring has a spiral shape.
17 . The lift pin of claim 15 , further comprising a nut threadably engaging the third portion and restricting axial movement of the retainer relative to the shaft.
18 . An assembly comprising the lift pin of claim 12 and first and second bushings, the first bushing including a first bore sized to receive the first portion of the shaft, the second bushing including a second bore having first and second inner diametrical surfaces and a step between the first and second inner diametrical surfaces, the first inner diametrical surface being sized to receive the first portion of the shaft, the second inner diametrical surface being sized to receive the second portion of the shaft and prevent passage of the first portion of the shaft therethrough.
19 . The assembly of claim 18 , wherein a diameter of the second inner diametrical surface of the second bore is smaller than the first diameter of the first portion of the shaft, and wherein a diameter of the first bore is smaller than the third diameter of the head of the lift pin.
20 . The assembly of claim 19 , further comprising a die, a hoist and a chain, the die including first and second spaced apart studs engaging the first and second bushings, respectively, the chain extending from the hoist and engaging the first portion of the shaft between the first and second studs.