US 9,174,331 B1Granted

Bushing removal tool

AssigneeRoper Pump Company

InventorJohn Matthew Coghlan

Life of this patent

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Abstract

Gear pumps use various types of bushings or bearings (sleeves) between a shaft and the housing of the pump. From time to time, these sleeves wear out and have to be replaced. This extractor removes the sleeves and includes three main components—a collet or sleeve engaging member, a mounting bracket, and a lift screw. The extractor may also include other components within the scope of the invention, including melting screws and washers.

Claims9

Dependent claims

An extractor tool for pulling a sleeve out of a housing, the sleeve having a central recess defining a radial surface, the extractor tool comprising:

a mounting bracket including a central bridge member with a top face and a depending member integral with the central bridge member and extending therefrom a first distance towards a distal housing engaging surface thereof opposite the top face to contact a surface of the housing outside the sleeve, the depending member and the central bridge member defining a sleeve receiving channel within the mounting bracket, the central bridge member having a bore therethrough in alignment with the sleeve receiving channel;
a lift screw including a shaft having an exterior threaded surface, the lift screw extending through the bore in the mounting bracket;
and
a sleeve engaging member continuous with the shaft and slidingly engageable within the central recess of the sleeve, the sleeve engaging member having a proximal end and a distal end, the sleeve engaging member integrally having an exterior wall and an interior bore extending therethrough, the bore having an internally threaded tapered surface with a thread sized complementarily to the exterior threaded surface of the shaft of the lift screw, the internally threaded tapered surface of the interior bore having a diameter smaller at the distal end of the sleeve engaging member than at the proximal end thereof, the distal end including a grasping portion with a plurality of longitudinal slots dividing the grasping portion into a plurality of grasping members, each grasping member being radially expandable upon the rotation of the shaft towards the distal end to cause the exterior wall to engage the radial surface of the sleeve,
the lift screw being rotatable in a first rotatable direction relative to the sleeve engaging member to cause the exterior threaded surface of the shaft to engage the internally threaded tapered surface of the interior bore to cause the exterior wall of the sleeve engaging member to radially expand and grip the radial surface of the sleeve, and to pull the sleeve out of the housing.

2 more elements

Dependencies are inferred from the claim text.

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Abstract

An extractor tool for pulling a sleeve out of a housing, the sleeve having a central recess defining a radial surface, the extractor tool comprising:

a mounting bracket including a central bridge member with a top face and a depending member integral with the central bridge member and extending therefrom a first distance towards a distal housing engaging surface thereof opposite the top face to contact a surface of the housing outside the sleeve, the depending member and the central bridge member defining a sleeve receiving channel within the mounting bracket, the central bridge member having a bore therethrough in alignment with the sleeve receiving channel;
a lift screw including a shaft having an exterior threaded surface, the lift screw extending through the bore in the mounting bracket;
and
a sleeve engaging member continuous with the shaft and slidingly engageable within the central recess of the sleeve, the sleeve engaging member having a proximal end and a distal end, the sleeve engaging member integrally having an exterior wall and an interior bore extending therethrough, the bore having an internally threaded tapered surface with a thread sized complementarily to the exterior threaded surface of the shaft of the lift screw, the internally threaded tapered surface of the interior bore having a diameter smaller at the distal end of the sleeve engaging member than at the proximal end thereof, the distal end including a grasping portion with a plurality of longitudinal slots dividing the grasping portion into a plurality of grasping members, each grasping member being radially expandable upon the rotation of the shaft towards the distal end to cause the exterior wall to engage the radial surface of the sleeve,
the lift screw being rotatable in a first rotatable direction relative to the sleeve engaging member to cause the exterior threaded surface of the shaft to engage the internally threaded tapered surface of the interior bore to cause the exterior wall of the sleeve engaging member to radially expand and grip the radial surface of the sleeve, and to pull the sleeve out of the housing.

2 more elements