초록 ▼

A pulling head includes a sleeve which threadably engages a sleeve adapter. A collet is threadably engaged with a drawbar adapter, and the collet and drawbar adapter are disposed and slidable in the sleeve. A set of jaws is disposed in the collet, and a jaw follower is disposed in the collet and con

A pulling head includes a sleeve which threadably engages a sleeve adapter. A collet is threadably engaged with a drawbar adapter, and the collet and drawbar adapter are disposed and slidable in the sleeve. A set of jaws is disposed in the collet, and a jaw follower is disposed in the collet and contacts the jaws. A spring retainer is disposed in the collet, and engages two springs. Specifically, a first spring is disposed between the drawbar adapter and the spring retainer, and a second spring is disposed between the spring retainer and the jaw follower. The first spring has a higher rating than does the second spring. While the first spring is configured to accommodate inertia loading, the second spring is configured to urge the jaws closed yet be relatively easily overcome by the insertion of mandrels of different diameters.

대표청구항 ▼

What is claimed is: 1. A pulling head engageable with an installation tool and configured to pull on a mandrel, said pulling head comprising a body which is engageable with the installation tool, wherein the body comprises a sleeve, a first spring which is disposed in the body, a second spring whic

What is claimed is: 1. A pulling head engageable with an installation tool and configured to pull on a mandrel, said pulling head comprising a body which is engageable with the installation tool, wherein the body comprises a sleeve, a first spring which is disposed in the body, a second spring which is disposed in the body, a collet, and a drawbar adapter, wherein said collet is threadably engaged with the drawbar adapter, and the collet and drawbar adapter are disposed and slidable in the sleeve, wherein said first spring is configured to provide that the pulling head accommodates inertia loading, and said second spring is configured to provide that the pulling head is useable in association with a range of mandrel diameters, wherein the first spring is rated higher than the second spring, further comprising a spring retainer which is desposed in the collet, and engages the first spring and second spring, and a jaw follower which is disposed in the collet and which contactably engages the jaws, wherein the first spring is disposed between the drawbar adapter and the spring retainer, and the second spring is disposed between the spring retainer and the jaw follower, wherein said spring retainer bottoms against a shoulder of the collet such that the load from the first spring is not transmitted to the jaw follower, wherein a spring force of said first spring need not be overcome to install a mandrel in the pulling head. 2. A pulling head as recited in claim 1, wherein the body includes a first end configured to engage the installation tool and a second, opposite end having an opening for receiving the mandrel, wherein said second spring is closer to said opening than is said first spring, and said first spring is closer to said first end of said second spring. 3. A pulling head as recited in claim 1, further comprising a sleeve adapter and a jam nut, wherein the sleeve threadable engages the sleeve adapter, and the jam nut secures the sleeve relative to the sleeve adapter. 4. A pulling head as recited in claim 1, further comprising a set of jaws disposed in the collet, proximate a taper provided in the collet. 5. A pulling head as recited in claim 4, wherein each of the jaws has a V-shaped surface for contacting the mandrel. 6. A pulling head as recited in claim 1, further comprising a set of jaws disposed in the collet, wherein said collet includes an internal taper, and wherein said jaws are spring biased toward said internal taper by said second spring. 7. A pulling head as recited in claim 1, further comprising by further characterized by a set of jaws disposed in the collet, and a jaw follower which is disposed in the collet and which contactably engages the jaws.