Strand lubrication

Abstract

A strand being pulled through a conduit is automatically lubricated.

1 . Apparatus comprising a pump to force a viscous lubricant from a supply to a lubricator at which the lubricant is to be dispensed onto a strand that is being pulled through a conduit, the pump including a gear pump, a motor to drive the gear pump, and a foot pedal to control the motor.  
   
   
       2 . The apparatus of  claim 1  in which the motor has different transmissions to vary the amount of lubricant applied to the strand.  
   
   
       3 . The apparatus of  claim 1  in which the gear pump comprises a pair of gears to force the lubricant from a reservoir to an outlet for a supply hose.  
   
   
       4 . The apparatus of  claim 3  also including a mechanism to feed lubricant from the supply to the reservoir.  
   
   
       5 . The apparatus of  claim 4  in which the mechanism comprises an auger.  
   
   
       6 . The apparatus of  claim 5  in which the auger is geared to the gear pump.  
   
   
       7 . The apparatus of  claim 5  in which the auger is driven to oversupply the reservoir relative to the amount of lubricant being pumped by the gear pump.  
   
   
       8 . The mechanism of  claim 1  also comprising the lubricator.  
   
   
       9 . The mechanism of  claim 8 , in which the lubricator comprises a plastic material having embedded channels that carry the lubricant under pressure from an inlet to outlets at which the lubricant is dispensed.  
   
   
       10 . The apparatus of  claim 9  in which the plastic comprises glass-filled polypropylene.  
   
   
       11 . The apparatus of  claim 9  in which the lubricator comprises two plastic pieces.  
   
   
       12 . The apparatus of  claim 9  also including ribs formed on an outer surface of the lubricator.  
   
   
       13 . The apparatus of  claim 8  in which the lubricator includes a brush to prevent the lubricant from leaking out of the lubricator, the brush being removable from the lubricator for replacement when the brush is worn.  
   
   
       14 . The apparatus of  claim 13  in which the brush includes bristles arranged in a ring, an end of each of the bristles being held in a ring-shaped ferrule.  
   
   
       15 . The apparatus of  claim 14  in which the lubricator includes a receptacle into which the ring-shaped ferrule can be inserted and removed for replacement.  
   
   
       16 . The apparatus of  claim 15  in which the lubricator includes a groove to mate with the ferrule.  
   
   
       17 . The apparatus of  claim 13  in which the brush is removable by sliding a portion of the brush with respect to a portion of the lubricator.  
   
   
       18 . The apparatus of  claim 13  in which the brush defines a chamber between the brush and the conduit when the lubricator is mounted on the conduit, and the lubricant includes outlets configured to dispense lubricant into the chamber.  
   
   
       19 . The apparatus of  claim 3  also comprising a set of lubricators, each of the lubricators being configured to apply a lubricant to a strand as it is pulled through a conduit, the lubricators being respectively configured for use with different sizes of conduit, and a holder having receptacles that are each sized to hold one of the lubricators of the set.  
   
   
       20 . The apparatus of  claim 19  in which there are fewer than six lubricators in the set.  
   
   
       21 . The apparatus of  claim 19  in which the set includes at least two subsets of the lubricators, and also including a second holder having receptacles that are each sized to hold one of the lubricators of one of the subsets, the lubricators of one of the subsets all being larger than any of the lubricators of the other of the subsets.  
   
   
       22 . The apparatus of  claim 19  in which the holder comprises an airtight container that is sealed to prevent the lubricant from drying out.  
   
   
       23 . The apparatus of  claim 3  also comprising a container for the lubricator, including a receptacle that is configured to match a configuration of at least part of the lubricator to hold the lubricator in place as the container is moved, and a seal to prevent the lubricant from leaking outside the container.  
   
   
       24 . The apparatus of  claim 23  in which the container includes a body and a lid and the seal is between the body and the lid.  
   
   
       25 . The apparatus of  claim 3  also comprising the lubricator, in which the lubricator comprises two separable pieces that are joined to mount the lubricator around the strand, a reservoir that holds a supply of a lubricant, the reservoir being split between the two separable pieces, and a seal to seal the reservoir when the two pieces are joined, the seal comprising a silicone packing mounted in at least one of the pieces.  
   
   
       26 . The apparatus of  claim 25  in which the reservoir comprises a ring-shaped tube that is formed in a wall of each of the two separable pieces, the tube being split when the pieces are not joined.  
   
   
       27 . The apparatus of  claim 3  also comprising an adaptor to adapt an end of a conduit to enable it to receive a coupling of the lubricator when the end of the conduit is held in a wall of a manhole, the adaptor including an annular body having one end to insert into the end of the conduit and another end having a coupling to receive the coupling of the lubricator.  
   
   
       28 . The apparatus of  claim 27  in which the coupling of the adaptor comprise threading.  
   
   
       29 . The apparatus of  claim 27  in which the one end of the annular body is tapered.  
   
   
       30 . The apparatus of  claim 27  in which the adaptor comprises two pieces.  
   
   
       31 . The apparatus of  claim 27  in which the two pieces comprises halves of a cylinder.  
   
   
       32 . The apparatus of  claim 27  in which the adaptor is formed of plastic.  
   
   
       33 . The apparatus of  claim 1  also including an auger to feed the gear pump from a supply.  
   
   
       34 . Apparatus comprising a lubricator at which lubricant is to be dispensed onto a strand that is being pulled through a conduit, a pump to force a viscous lubricant from a supply to the lubricator, the pump comprising a pair of gears to force the lubricant from a reservoir to an outlet for a supply hose, a motor to drive the pump, the motor having different transmissions to vary the amount of lubricant applied to the strand, and a mechanism to feed lubricant from the supply to the reservoir, in which the mechanism comprises an auger geared to the gear pump, and in which the anger is driven to oversupply the reservoir relative to the amount of lubricant being pumped by the gear pump.