Deadline anchor pigtail clamp

Patent metadata

Field	Value
Publication number	US-2018291981-A1
Application number	US-201715483477-A
Country	US
Kind code	A1
Filing date	Apr 10, 2017
Priority date	Apr 10, 2017
Publication date	Oct 11, 2018
Grant date	—

Abstract

An anchor for clamping a handling system deadline and controlled by an actuator, such as a hydraulic cylinder or a gearbox coupled to an electric motor. The anchor may generally operate using a pivoting clamping mechanism, wherein the deadline is held between a static clamp plate and a pivoting clamp plate. The pivoting clamp plate may pivot at a pivot point arranged between the two plates. A bolt may be arranged through an opening in each of the clamp plates. A first end of the bolt may extend beyond an outer surface of the pivoting clamp plate and couple to an end block. At a second end, the bolt may extend beyond an outer surface of the static clamp plate and couple to the actuator. As a linear force is applied to the bolt by the actuator, the bolt may pull the pivoting clamp plate toward the static clamp plate.

First claim

What is claimed is:

1 . A deadline anchor for a handling system, the deadline anchor comprising:
a pair of clamp plates configured to receive a deadline therebetween, wherein at least one clamp plate is configured to pivot about a pivot point arranged at a first end of the pair of clamp plates; a bolt arranged through an opening in each of the clamp plates, the bolt having an anchoring portion; and an actuator coupled to the bolt and configured to apply a force to the bolt; wherein the clamp plates are configured to receive the deadline at a location between the first end and the bolt.

2 . The deadline anchor of claim 1 , wherein the actuator comprises a hydraulic cylinder.

3 . The deadline anchor of claim 1 , wherein the actuator comprises a gearbox.

4 . The deadline anchor of claim 3 , wherein the gearbox comprises a primary gear and a rotating shaft in communication with the primary gear.

5 . The deadline anchor of claim 3 , further comprising an electric motor coupled to the gearbox.

6 . The deadline anchor of claim 1 , further comprising a pair of clamp inserts, each clamp insert arranged between a clamp plate and the deadline.

7 . The deadline anchor of claim 1 , further comprising a spacer arranged between the actuator and the pair of clamp plates.

8 . The deadline anchor of claim 7 , wherein the bolt is arranged through an opening in the spacer.

9 . The deadline anchor of claim 1 , wherein the bolt comprises a swivel point.

10 . The deadline anchor of claim 1 , further comprising at least one spring arranged on the bolt and configured to provide a visual indication of force on the bolt.

11 . The deadline anchor of claim 10 , wherein the at least one spring is a Belleville spring.

12 . The deadline anchor of claim 1 , further comprising an end block coupled to the bolt near an outer surface of one of the clamp plates.

13 . The deadline anchor of claim 2 , further comprising a clamping force alert system, comprising:
a housing coupled to the hydraulic cylinder via a pressure line; a plunger extending from the housing; and a spring arranged within the housing; wherein when an effective amount of hydraulic pressure is applied to the bolt, the pressure in the line will cause the spring to compress, and the plunger to retract.

14 . The deadline anchor of claim 2 , further comprising a pressure relief valve arranged on one of the clamp plates and comprising a pin, the pressure relief valve configured to open to release hydraulic pressure when the pin touches the second clamp plate.

15 . The deadline anchor of claim 1 , further comprising a strain gauge arranged on the bolt.

16 . The deadline anchor of claim 15 , further comprising a power cut sensor communicably coupled to the strain gauge.

17 . A method of tightening a deadline anchor, the method comprising:
applying a linear force to a bolt, the bolt arranged through a pivoting clamp plate and a static clamp plate, and coupled to an end block arranged near an outer surface of the pivoting clamp plate, wherein applying the linear force to the bolt causes the bolt to pull the pivoting clamp plate about a pivot point and toward the static clamp plate.

18 . The method of claim 17 , further comprising tightening a nut on the bolt to secure the bolt with respect to the clamp plates.

19 . The method of claim 17 , wherein applying a linear force comprises activating a hydraulic cylinder.

20 . The method of claim 17 , wherein applying a linear force comprises activating a gearbox comprising a worm gear.

Assignees

• Nat Oilwell Varco Lp

Inventors

• Kaybidge Reece William
• Nealon Lucas Arnesen

Classifications

• F16G11/12 Primary

  Connections or attachments, e.g. turnbuckles, adapted for straining of cables, ropes, or wire (straining wire in general B21F9/00) · CPC title

• E21B19/02 Primary

  Rod or cable suspensions · CPC title