Universal rotating scroll puller

Abstract

The Universal Rotating Scroll Puller is a new and improved tool for application with automotive, commercial, marine, and industrial remanufacturing. This puller has several advantages. It is fast and easy to use, has good gripping force, is self-centering, adjustable to many different sizes, and can pull a wide variety of mounted objects. Some applications include bearings, V-groove and serpentine pulleys, and alternator frames of various shapes, sizes and locations. Varieties of finger sets are available for multiple applications and extractions. The number of fingers sets can vary from as few as two fingers to as many as six, but most commonly, this puller uses six fingers that can move radially inward or outward by means of a flat scroll plate that is turned about a central axis in order to maneuver the self-centering fingers.

Claims

1. A pulling tool comprising: a hollow elongated cylindrical master sleeve having an outer diameter and two ends; the master sleeve comprising: an interior threaded hole on a proximal end, a threaded first step cut at a distal end; a step cut defining a portion of reduced diameter relative to the outer diameter of the master sleeve; a second step cut immediately proximal to the first step cut, the second step cut having a diameter greater than the first step cut, but less than the outer diameter of the master sleeve; a third step cut disposed adjacent the proximal end of the master sleeve; an elongated externally threaded screw member having a tapered point, the threaded screw member threadably received through the interior threaded hole of the master sleeve at the proximal end; a scroll location plate having a non-threaded center bore and symmetrically spiral-cut grooves on a lower face of the scroll location plate; a master slotted disk with a threaded center bore and a plurality of T-slots extending in a radial direction, cut completely through a thickness of the master slotted disk; and a plurality of fingers, each of the plurality of fingers having a pin at a respective proximal end, each of the pins disposed in a corresponding spiral-cut groove; wherein the threaded first step cut is releasably connected through the non-threaded center bore of the scroll location plate and into the threaded center bore of the master slotted disk, such that the second step cut engages the non-threaded center bore of the scroll location plate; and such that the scroll location plate is in stacked orientation with the master slotted disk.

2. The pulling tool of claim 1, wherein the plurality of T-slots are stepped slots having a width on an upper face of the master slotted disk greater than a width on a lower face of a the master slotted disk; wherein each of the plurality of T-slots is configured to receive a respective finger and is configured to allow each of the respective fingers to move radially inwardly and outwardly; the tool further comprising a U-shaped clamp that rigidly connects the master slotted disk to the scroll location plate via a threaded member, such that the lower face of the scroll location plate directly opposes the upper face of the master slotted disk.

3. The pulling tool of claim 2, wherein the spiral-cut grooves extend symmetrically about a center point, such that relative translation of each respective pin in a corresponding spiral-cut groove provides for radial inward and outward movement of each of the respective fingers; wherein the scroll location plate and the master slotted disk are rotatable relative to the master sleeve, and aligning outer portions of the spiral-cut grooves with respective outer portions of the plurality of T-slots allows for finger installation; wherein the scroll location plate is configured to rotate about the master sleeve via the non-threaded center bore of the scroll location plate.

4. The pulling tool of claim 3, wherein each of the fingers further comprises a guide disposed immediately adjacent each respective pin, each of the guides comprising a generally square shape and configured to be selectively received in a respective slot of the upper face of the master slotted disk in one of four orientations, allowing each finger to be disposed radially inwardly, or radially outwardly, or in one of two circumferential directions, relative to the master slotted disk; such that the fingers are configured to move radially inwardly or radially outwardly relative to the master slotted disk upon rotation of the scroll location plate.

5. The pulling tool of claim 4, wherein each finger has first and second opposing sides, each opposing side having a longitudinally concave surface; each of the first opposing sides comprising a plurality of grooves configured to engage a serpentine belt pulley, and each of the second opposing sides comprising a recess configured to engage a V-belt pulley.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 is a top plan view of the invention noted as a whole assembly

(2) FIG. 2 is an exploded view perspective

(3) FIG. 3 is a presentation of the three sets of slotted disks

(4) FIG. 4 is a bottom view perspective of the puller in operation

(5) FIG. 5 is a view of fingers, master sleeve, bolt, bolt extension, U-shaped clamp, O-rings, screw, and wing screw

(6) FIG. 6 is a view of fingers placed into a V-groove pulley and a serpentine pulley

(7) FIG. 7 is a view of the puller removing a pulley from the shaft

DETAILED DESCRIPTION OF THE INVENTION

(8) Referring to FIG. 1, the puller 1 consists of a hollow-center 30 master sleeve 22, three master slotted disks 7, 9, 11 with a threaded center bore 17 and matching scroll location plates 8, 10, 12. The master slotted disks 7, 9, 11 and scroll location plates 8, 10, 12 are held together with the master sleeve 22 and locked with a U-shaped clamp 14, attached by a screw 44, and wing screw 13. On the master slotted disk 7, 9, 11 is a slot 20 to attach the U-shaped clamp 14 in order to lock the scroll location plate and master slotted disk, once the fingers 34, 35, 36, 37, 38, 39, 40, 41 are positioned for extractions. The master slotted disk 7, 9, 11 has multiple T-slots 18 for the fingers 34, 35, 36, 37, 38, 39, 40, 41 to glide inward and outward. At the top of each finger 34, 35, 36, 37, 38, 39, 40, 41 is a cylindrical retention pin 31, below the cylindrical retention pin 31 is a four-sided squared-shouldered guide 32. At the bottom of each finger is a unique flange 33. The matching scroll location plates 8, 10, 12 have a symmetrically spiral-cut groove 15 on the bottom side for the finger cylindrical retention pins 31 to nest. The scroll location plates 8, 10, 12 have a groove 26, to fit an O-ring 29 that facilitates the rotation of the scroll location plate 8, 10, 12 and holds fingers 34, 35, 36, 37, 38, 39, 40, 41 in place. The master sleeve 22 has an internal thread 23 to receive a threaded bolt 27 from the proximal end. A bolt extension 28 is available when needed. The bolt extension 28 contains an O-ring 43 to hold onto the threaded bolt 27. The distal end of the master sleeve 22 has an external thread 25 that screws into the master slotted disk 7, 9, 11 through the scroll location plate 8, 10, 12. With a step cut 24 above the threads, the scroll location plate 8, 10, 12 is allowed to turn left or right over the master slotted disk 7, 9, 11 by means of a non-threaded center hole 19.

(9) Referring to FIG. 5, this puller 1 has multiple types of fingers 34, 35, 36, 37, 38, 39, 40, 41, each with a cylindrical retention pin 31 positioned on the proximal end. All fingers 34, 35, 36, 37, 38, 39, 40, 41 are interchangeable with all three master slotted disks 7, 9, 11 and scroll location plates 8, 10, 12. The cylindrical retention pin 31 on the fingers 34, 35, 36, 37, 38, 39, 40, 41 fits into the symmetrically spiral-cut groove 15 on the bottom side of the scroll location plate 8, 10, 12. To install or replace fingers 34, 35, 36, 37, 38, 39, 40, 41, rotate the scroll location plate 8, 10, 12, to the right or left to align with the T-slots 18 of the master slotted disk 7, 9, 11, while simultaneously aligning with the opening of the symmetrically spiral-cut grooves 15, 16 of the scroll location plate. A four-slot master disk 7 with a matching scroll location plate 8, can be used to extract frames consisting of four or eight webs or holes. A five-slot master disk 9 with matching scroll location plate 10, is used in extraction of frames with five or ten webs or holes. A six-slot master disk 11 and matching scroll location plate 12 can be used for extractions in combinations of three or six webs or holes.

(10) A variety of finger sets capable of a perpendicular diameter adjustment are available for multiple applications and extractions. Using a set of six fingers 34 for various-sized V-groove pulleys 42 enables the repair person to completely encompass the pulley to minimize damage during extraction. By rotating the same fingers 34 90 degrees, the repair person is now able to remove multiple groove serpentine pulleys 5. Another set of fingers 37, 38, 39, 40, 41, each with a unique flange 33, can be used to remove alternator frames with webs or holes in multiple diameters. Yet another set of fingers 36, can be used to pull bearings and similar objects.