US3059327A

US3059327A - Pulley removing device

Info

Publication number: US3059327A
Application number: US822020A
Authority: US
Inventors: Burrows Allen
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-06-22
Filing date: 1959-06-22
Publication date: 1962-10-23
Anticipated expiration: 1979-10-23

Description

Oct. 23, 1962 A. BURROWS 3,059,327

PULLEY REMOVING DEVICE Filed June 22, 1959 IN VEN TOIL ALLEN BURROWS BY ATTO R N EY United States Patent 3,059,327 PULLEY REMOVING DEVICE Allen Burrows, Providence, R1. (38 James St., East Providence, RI.) Filed June 22, 1959, Ser. No. 822,020 3 Claims. (Cl. 29-258) My present invention relates to the tool art and more particularly to a device for removing a generator pulley for repairs.

The principal object of the present invention is to provide a device for easily and rapidly removing the pulley from a generator shaft.

Another object of the present invention is to provide a device which utilizes both pressure and shock for removing the pulley from a generator.

Another object of the present invention is to provide a simple and easily operable device for removing the pulley from the generator without distortion.

A further object of the present invention is to provide a device for removing a generator pulley which is simple in construction and easy and economical to manufacture and assemble.

With the above and other objects and advantageous features in View, my invention consists of a novel arrangement of parts more fully disclosed in the detailed description following, in conjunction with the accompanying drawings and more particularly defined in the appended claims.

In the drawings,

FIG. 1 is a perspective view of the device for removing the generator pulley in operable position.

FIG. 2 is a longitudinal section of the device in inoperable position.

FIG. 3 is an exploded perspective View of the device.

In the repair of automotive generators it is usually found necessary to remove the generator pulley. This pulley is retained on the shaft by friction. The usual method is to supply a clamp for holding the pulley and hammering at the end of the shaft. However, this is a very awkward position and it is difficult to clamp the pulley. Another method is to provide a three jaw clamp which holds the pulley While applying pressure on the shaft. This method frequently distorts the pulley or the shaft or both. The present invention is designed to provide a simple device which utilizes the best features of both methods. The, device of the present invention is designed to simply and quickly clamp the generator pulley, apply pressure on the shaft, and then apply a hammering or a shocking action to break the friction grip and remove the pulley.

Referring more in detail to the drawings, the device comprises a base member preferably of cast metal and having spaced ears 11 integrally formed at each end through which screws 'or bolts 12 may be inserted to mount the device on a wall or ona table. The device is illustrated in position to mount on a wall. However, it can be turned 90 degrees, mounted on a table, and will operate from that position. Integrally formed with the base 10 at the forward edge thereof is a tapered arcuate flange 13 having a semicircular shape. The base may be provided with a strengthening rib 14 extending parallel with the forward edge of the flange 13. Extending integrally laterally from the base 10, at each side edge is a heavy ear portion 15 on a transverse line rearwardly of the forward ends of the flange 13. The ears 15 have longitudinal openings therein in which a pair of shafts 16 are mounted. -Each shaft 16 is locked in itsear 15 by passing a cotter pin 17 through the portion 15 and shaft 16 as shown in FIG. 1. The shafts 16 are thus retained rigidly in spaced parallel relation and the distance be Patented Oct. 23, 1962 ice tween the shafts is greater than the largest size of pulley to be removed.

I now provide an A-shaped frame 18 which may also be in the form of an integral metal casting. The frame 18 is provided with slanted side walls 19 each terminating at its lower end 20 with a bearing portion having a longitudinal opening with a diameter slightly greater than the diameter of the shafts 16. The frame 18 is thus slidably mounted on the shafts 16 and can be readily moved along the shafts. The frame 18 is provided with a lower integral transverse brace 21 having a U-shaped central cut out portion 22 in vertical alignment with the top center of the frame 18. Adjacent to the top of the frame 18 but spaced therefrom is a second short transverse bar or brace 23 having a central opening. The bar 23 is provided with inwardly extending wall portions 24 extending from each end towards each other as shown in FIG. 1. The top of the frame 18 is provided with a flattened portion 25 having a central opening 26 in vertical alignment with the opening in the bar 23 and of the U-shaped cut out 22 in the bar 21.

Mounted on the shafts 16 is a third casting 27 which comprises a transverse body portion having end bearings 28 with transverse openings of larger diameter than the shafts 10 so that it will slide freely on the shafts 16. A wing bolt 29 extends through the portion 28 at each end so that the member 27 can be locked in any desired position along the shafts 16. The member 27 is arcuate in the center portion curving opposite the flange 13 on the base 10 and complementary to it. It is provided with a tapered horizontal flange 30 similar to the flange 13 with the ends 31 extending forwardly of the portions 28 as shown in FIG. 2.

I now provide an elongated threaded bolt 32 of smaller diameter than the frame opening 26 and the opening in the brace 23. A nut 33 which threadedly engages the bolt 32 is positioned on the brace 23 so that the bolt 32 passes through the opening 26, threadedly engages the nut 33, then passes through the opening in the brace 23 and extends through the U-shaped portion 22 on the brace 21. The lower end of the bolt 32 may be unthreaded. Now referring to FIG. 1 the nut 33 is preferably rectangular and of such size that it can be positioned between the portions 24 but cannot be rotated between the portions 24. Also, referring to FIG. 2, the distance between the top of the frame 18 and the brace 23- is greater than the thickness of the nut 33 leaving a space between the nut and the top of the frame.

In use, the generator shown in dotted lines in FIG. 1 is positioned so that the pulley is in a plane in alignment with the

flanges

13 and 30. The pulley is pushed towards the base until the groove in the pulley engages the flange 13 in the base. The member 27 is then pushed inwardly until its flange 31 enters the groove in the pulley on the opposite side. The curvature of the flanges are such that they will engage more than half the circumference of the pulley grooves. With the flanges entering the pulley groove the Wing nuts 29 are tightened to lock the pulley in place. The frame 18 is now slid along the shafts 16 until the bolt 32 is in vertical alignment with the pulley shaft. The bolt 32 is now turned clockwise, the threads engaging the nut 33 which cannot turn. When the bot-tom end of the bolt 32 engages the pulley shaft on the generator additional movement will lift the bolt 32 upwardly against the top of the frame 18 as shown in FIG. 1. This is so because the bolt 32 is not threaded into the frame. The space is now between the brace 23 and the underside of the nut 33; The bolt 32 is now tightened to provide a pushing strain on the generator shaft. However, it is not tightened to a point Where the pulley or the shaft will become distorted. A

hammer can now be used sharply to break the frictional engagement between the pulley and the shaft. It will be noted that the blow of the hammer will not strain the frame 18 or affect the threads on the bolt 32. Since the bolt is actually loosely mounted in the frame it can travel downwardly the distance between the bottom of the nut 33 and the brace 23. This is suflicient to cause a separation of the pulley from the shaft. The top of the A-frame 18 and the brace 23 help to align the bolt 32 and keep it from bending. A tight fit at this point is therefore unnecessary. It will be found in actual use that it is unnecessary to tighten the wing nuts 29 except in the most stubborn cases. The pulley is placed in position, the member 27 pushed inwardly and the bolt 32 tightened in a matter of minutes.

The device of the present invention can be used as a puller to remove V type grooved light weight pulleys made of sheet iron or non-ferrous metal in any construction where the pulley will tend to bend or fracture when excessive pressure is applied. The conventional three jaw puller commonly used, will ruin these V type, because they grip the pulley far out on the outer periphery. A heavy pull with this type puller will bend the grooves of the pulley and fracture the pulley clear to the hub. On most generators the jaws are too thick to go between the pulley and the end plate. Also, most arbor presses will not take these generator pulleys because the end plates are too big to go into the press.

The puller of the present invention grips the pulley down into the bottom of the grooved V nearest to the hub where the pulley is the strongest, because that is where the flanges that make up the pulley are fastened together. The device of the present invention has a wrap around effect which in most cases will contact from 75% to 100% of the circumference of the pulley. This type of contact, plus a steady continuous applied pressure by the bolt, makes the shocking action extremely effective in removing the pulley without damage.

I have thus provided a simple and effective device for removing a generator pulley from the shaft using pressure and a sharp blow. The hammering blow on the bolt does not wear the threads and the device provides a positive clamping action in a simple inexpensive construction. The device will operate either horizontally or vertically and can be used to remove other types of discs and pulleys from shafts. Other advantages of the present invention will be readily apparent to a person skilled in the art.

I claim:

1. A device for removing a pulley wheel from a shaft comprising a base member, spaced parallel supports extending forwardly from said base member, a clamping member slidably mounted on said supports for retaining a pulley wheel having a peripheral groove between said clamping member and said base member, and means slidably mounted on said supports between said base member and said clamping member for applying pressure on the pulley wheel shaft at right angles to a plane through said parallel supports, said pressure applying means comprising an A-shaped frame extending vertically from said supports and having bearing portions at its bottom ends slidable on said supports and extending at right angles to a plane through said supports, spaced parallel transverse braces extending between the sides of said frame, said frame and braces having vertically aligned openings, and a threaded bolt extending vertically through said openings, said openings being of greater diameter than said bolt, and a nut threaded on said bolt and positioned between the top of said frame and the upper of said transverse braces, said nut being thinner than the space between the upper end of said frame and said upper brace whereby said nut is free to move vertically between the upper end of said frame and said upper brace, said nut being trapped and held captive between said upper to hit the top of the bolt 32 end of said frame and said upper brace, the opening in said upper brace being smaller than the outer dimension of said nut, and means integral with said frame for restricting rotating movement of said nut, said base member comprising a generally elongated member having a bearing portion at each end for retaining said supports, the forward edge of said base member between said supports forming an arcuate flange for engaging the groove of the pulley wheel.

2. A device for removing a pulley wheel from a shaft comprising a base member, spaced parallel supports extending forwardly from said base member, a clamping member slidably mounted on said supports for retaining a pulley wheel having a peripheral groove between said clamping member and said base member, and means slidably mounted on said supports between said base member and said clamping member for applying pressure on the pulley wheel shaft at right angles to a plane through said parallel supports, said pressure applying means comprising an A-shaped frame extending vertically from said supports and having bearing portions at its bottom ends slidable on said supports and extending at right angles to a plane through said supports, spaced parallel transverse braces extending between the sides of said frame, said frame and braces having vertically aligned openings, and a threaded bolt extending vertically through said openings, said openings being of greater diameter than said bolt, and a nut threaded on said bolt and positioned between the top of said frame and the upper of said transverse braces, said nut being thinner than the space between the upper end of said frame and said upper brace whereby said nut is free to move vertically between the upper end of said frame and said upper brace, said nut being trapped and held captive between said upper end of said frame and said upper brace, the opening in said upper brace being smaller than the outer dimension of said nut, and means integral with said frame for restricting rotating movement of said nut, said base member comprising a generally elongated member having a bearing portion at each end for retaining said supports, the forward edge of said base member between said supports forming an arcuate flange for engaging the groove of the pulley wheel, said clamping member comprising an elongated member having a bearing portion at each end, said supports passing through said bearing portions,

the edge of said clamping member facing said base member having an arcuate flange for engaging the groove of the pulley wheel.

3. A device for removing a pulley wheel from a shaft comprising a base member, spaced parallel supports extending forwardly from said base member, a clamping member slidably mounted on said supports for retaining a pulley wheel having a peripheral groove between said clamping member and said base member, and means slidably mounted on said supports between said base member and said clamping member for applying pressure on the pulley wheel shaft at right angles to a plane through said parallel supports, said pressure applying means comprising an A-shaped frame extending vertically from said supports and having bearing portions at its bottom ends slidable on said supports and extending at right angles to a plane through said supports, spaced parallel transverse braces extending between the sides of said frame, said frame and braces having vertically aligned openings, and a threaded bolt extending vertically through said openings, said openings being of greater diameter than said bolt, and a nut threaded on said bolt and positioned between the top of said frame and the upper of said transverse braces, said nut being thinner than the space between the upper end of said frame and said upper brace whereby said nut is free to move vertically between the upper end of said frame and said upper brace, said nut being trapped and held captive between said upper end of said frame and said upper brace, the opening in said upper brace being smaller than the outer dimension of said nut, and means integral with said frame for restricting rotating movement of said nut, said supports comprising shafts each having one end locked in said base member, said shafts passing through bearing portions on said clamping member and said A-shaped :frame.

References Cited in the file of this patent UNITED STATES PATENTS Colta May 19, 1914 Gaillard Jan. 5, 1915 Shilling Feb. 15, 1921 Paulson Aug. 8, 1922 Florence Feb. 9, 1926 Kap' lan July 7, 1942 FOREIGN PATENTS France Nov, 18, 1953