US 2031998 A
Description (OCR text may contain errors)
Feb. 25, 1936. v. BLISS 2,031,998
BEARING PULLING TOOL Filed April 26, 1955 Ruin 16 I 517512!" LDUI'J I ZBLIEE I Km BY 7 flfiy Patented Feb. 25, 1936 UNITED STATES PATENT OFFICE Application April 26, 1935, Serial No. 18,483 In Canada July 24, 1934 1 Claim. (Cl. 29-883) This invention relates to a tool for pulling or extracting annuli seated in members having cylindrical interiors, for example, for extracting internally seated bearings, bearing cups, etc.
Heretofore there have been in use tools for pulling externally seated bearings or bearings seated internally in cylindrical depressions. However. with the tools adapted for use in the latter case it is practically impossible to remove bearings from members having cylindrical interiors when the bearings are placed at a distance from the bottom or end of the member. Another objection to the use of these last mentioned tools is the fact that it is necessary to place certain parts of a tool on the bottom of the depression in order to be able to place the remaining parts in operative position and finally to adjust the tool for the pulling operation.
These objections are overcome by providing a tool comprising a shaft, jaws carried by the shaft adapted to be brought into contact with the hearing by means of a tapered head also carried by the shaft, means for holding the jaws in operative position, means for carrying the load and means for operating the tool to remove the bearing, as more fully described in the following specification and illustrated in the accompanying drawing, in which Figure l is a side elevation of the tool shown mounted on a cylindrical member in operative position, the cylindrical member and bearing seated therein being shown in section.
Figure 2 is a section taken on the line 2--2 of Figure 1.
Figure 3 is a section taken on the line 3-3 of Figure 2.
Figure 4 is a fragmentary sectional view taken on the line 4-4 of Figure 3.
Referring more particularly to the drawing, A is the improved tool and B is the member having a cylindrical interior in which bearing C is seated. The tool A comprises a screw threaded shaft 6 having a reduced portion 1 at the lower end thereof. Mounted on the reduced portion 1 is a tapered head 8 having parallel sides 9 and Ill and upwardly converging rounded ends II and I2. Jaws l4 and I5, one of which is slightly longer than the other, are formed with outwardly projecting lugs l6 at their lower ends and with portions I! at their upper ends bent inwardly at approximately right angles thereto, said portions I! being provided with openings I8 somewhat larger in diameter than shaft 6 whereby the jaws are loosely carried by the shaft. Jaws I4 and I5 are transversely curved, as shown in Figure 3, so that their inner faces fit over the curved ends II and I2 of head 8, and their outer faces fit within the curve of the bearing 0. j
A load-bearing block I 9 threaded on shaft 6, is adjustable longitudinally thereof. The position 5 assumed by block IS on the shaft depends on the size of bearing C. When the bearing is relatively wide, as shown in Figure 1, block I9 is set so that when the portions I! rest thereon the lower ends of the jaws bear against head 8 at its widest 1 point. However, for narrower bearings, block I9 is moved upwardly on shaft 6 so that the lower ends of the jaws bear against head 8 at a narrower point, this being possible due to the fact that the jaws are flexible. In this manner the 15 tool may be used for pulling bearings of various sizes. Head 8 may be replaced by a larger or smaller head if it is desired.
Threaded on shaft 6, above portions I1, is a nut 2| which may be screwed downwardly against 20 said portions to hold the jaws firmly in their operative position.
A hollow dome-shaped housing 22 is loosely mounted on shaft 6 by means of an orifice 23 the diameter of which is slightly greater than 25 that of the shaft, and is provided with relatively large openings 24 in each side thereof. It is adapted to be moved longitudinally of shaft 6 by a handle 25 screw-threaded onto the upper por- 30 tion of said shaft above the housing.
The tool is used as follows:-
Nut 2| is moved upwardly on shaft 6 and the block l9 adjusted thereon so that when the portions I! of the jaws I 4 and I5 rest thereon, their 35 lower ends will be spread by head 8 to fit tightly within the bearing to be pulled. Next, the jaws are raised from block l9 until their lower ends swing inwardly against the shaft to allow the lower end of the tool to be inserted within the 40 bearing. Then the jaws are released and nut 2| screwed downwardly onto portions I! to firmly hold the jaws in place. Housing 22 is placed on member B and handle 25 is turned until it bears against the top of the housing. By continuing 5 to turn the handle, shaft 6 is drawn outwardly and lugs l6 bearing against the lower part of bearing C pull it outwardly until it is withdrawn from member B. As the bearing is being pulled, the operator may keep sight of the lower part of the tool and may make any necessary adjustments thereto through openings 24.
From the above it will readily be seen that a tool has been provided which may be very easily adjusted and placed in operating position 2o Jecting lugs and being movable toward and away in a member with a cylindrical interior to pull a bearing seated therein.
Various modifications may be made in this invention without departing from the spirit thereof or the scope of the claim, and therefore the exact forms shown are to be taken as illustrative only and not in a limiting sense, and it is desired that only such limitations shall be placed thereon as are disclosed in the prior art or are set forth in the accompanying claim.
What I claim is:-
A device for pulling annuli seated in members having cylindrical interiors, comprising a screwthreaded shaft, transversely curved jaws having portions turned in at substantially right angles thereto, said inturned portions having openings therein of a diameter slightly larger than that of the shaft whereby the Jews are slidable on the shaft, the lower ends of the iaws having profrom the shaft, a head mounted on the shaft for spreading the lower ends of the jaws to grip the annulus, said head having parallel sides and transversely curved ends which converge towards the top thereof, a nut threaded on the shaft on the side of the inturned portions removed from the extremities of the jaws and a load taking block threaded in the shaft on the other side of the inturned portions, said nut andload taking block being adapted removably to hold the Jaws in expanded position and against longitudinal movement at any desired point on the shaft, a dome shaped housing slidable on the shaft and adapted to rest on the member from which the annulus is to be pulled, said housing having relatively large openings through which the jaws may be seen, and means for drawing the shaft and thus the annulus outwardly into the housing.
LOUIS VENCIL BLISS.