US1019718A - Bolt-extractor. - Google Patents

Description

J. A. MAGNUSSON.

BOLT EXTRAOTOR.

APPLIOATION FILED 00T. '1, 1911.

v 1,019,718. Patented Mar.5, 1912.

z SHEETS-SHEET 2. 3

UNITED STATES PATENT OFFICE.

JOHN A. MAGNUSSON, OF TACOMA, WASHINGTON, ASSIGNOR 0F ONE-HALF TO PETER R. TANZY, 0F TACOMA, WASHINGTON.

BOLT-EXTRACTOR.

Specication of Letters Patent.

Patented Mar. 5, 1912.

To all whom it may concern:

Be it known that I, JOHN A. MAcNUssoN, a citizen of the United States, residing at Tacoma, in the county of Pierce and State of Washington, have invented a new and useful Improvement in Bolt-Extractors, of which the following is a specication.

This invention relates to devices for drawing bolts outl of engine frames, and other similar uses, and has for its object to provide a mechanism which has great power and which can be applied in very limited space such as is commonly encountered in the work in locomotive repair shops.

Further objects are to provide devices for reducing the wear on the jack plunger and to prevent the entrance of air past the piston and also to provide a mechanism which will firmly grip the bolt head, or other object to be drawn, and which will tighten its grip thereon under the strain of drawing the bolt, and to provide a mechanism which will fit a large number of sizes of bolt heads without alteration.

I attain these and other objects by the devices, mechanisms, and arrangements illustrated in the accompanying drawings, in which- Figure 1 is a front elevation of the eX- tractor in use; Fig. 2 is a horizontal section thereof, showing the tie bar broken away to reveal the lower end of the device; Fig. 3 is a vertical section of the jack cylinder by which the power is applied to the bolt eX- tractor; Fig. 4 is a vertical section of the operating cylinder showing the plunger therein in elevation; and Fig. 5 is a side elevation of the jack showing the outer end thereof in section.

Similar numerals of reference refer to similar parts throughout the several views.

The bolt puller comprises a pair of side bars 1, having gripping jaws 2 at their lower ends, said jaws being preferably serrated and being removably secured to the bars 1 by means of screws 3. In order to take the strain ofi' the screws 3 I shape the lower end of the bars 1 with shoulders 4 engaging in corresponding notches formed in the jaws 2 so that the downward strain of the jaws is taken up by the shoulders 4. The upper ends of the bars 1 are curved toward each other so that they may meet at 5 and so that the under surface of said curved ends forms a wedge-shaped recess against which the wedge head may be pressed by the jack. Holes or slots G pass through each of the side bars 1, and a tie bar 7 passes through both of said slots 6. The tie bar 7 has holes in its ends through one of which the straight key S passes and through the other of which the wedge key 9 passes, both of said keys engaging said bars 1 in similar seats or grooves 10 in their outer sides. A bridge piece 11 straddles the tie bar 7 and engages the frame from which the bolt is to be drawn on each side of the bolt head and on each side of the jaws 2. The wedge head 12 is shaped to substantially fit the curved upper ends of the bars 1 and to be pressed upward by the jack which is placed between it and the upper end of the bridge piece 11.

This mechanism is applied as follows:- The two bars 1 are placed with their jaws 2 in contact with the bolt head and with their upper ends 5 touching each other; then the tie bar 7 is passed through the slots G and the keys 8 and 9 are inserted therein so that the bars 1 are held firmly together; then the wedge head 12 and the bridge piece 11 are inserted in place and the jack placed therebetween. As the jack forces the parts 11 and 12 apart the wedge pushes outward on the upper ends of the bars 1 and 'therefore forces thejaws 2 tightly into contact with the bolt head and when this motion ceases the further motion of the jack will force the jaws to pull the bolt out of the frame. The jack which I have devised for this purpose comprises a heavy cylinder 2O in which the piston 21 acts. The piston 21 is provided with a heavy shank 22, adapted to engage the wedge head 12, said shank 22 being smaller' than the piston and passing freely through the cover 23 of the cylinder 20, said cover acting as a guide therefor. A spring 2st is coiled between the cover 23 and the piston 21 to return the piston to the starting point as soon as the pressure is released therefrom. The piston is made tight by means of a leather cup 25 which is fastened thereto by a bolt 26 pressing on a large washer 27. The washer 27 has a flange extending around its circumference. A spring 2S lies within the channel formed by the flange of the washer' 27 and presses outward on the leather cup 25 to prevent air from entering under the piston when the jack is not in use or when the pressure is being reduced thereunder. A long cylinder 29, of much smaller diameter than the cylinder 20, is connected thereto below the piston 2l by a passage. A plunger or plug is within the cylinder 29 and is free to move longitudinally therein but will not allow any leakage therepast. This plunger comprises a head 80, having a bolt or screw-threaded shank extending therefrom, on which are mounted two or more leather packing rings 3l separated by washers 32, all of said parts being held together by the nuts on the shank of the head 30. This plunger is not attached to anything but is pressed forward without rotation by the end of the operating screw 33, thus keeping the packing 31 from wearing out by its being turned in the cylinder 29. The rod 33 is screwed through a long nut 34, secured to the end of the cylinder 29, and enters the said cylinder behind the said plunger'. A single turn of the rod 33 will cause its end to travel a very short distance in the cylinder 29 and its end will press against the head 30 of the plunger, thus forcing it forward, or will remove the said pressure and thus allow it to be forced backward by the pressure in the cylinder 20 produced bythe spring 24. Oil is placed in the cylinders 2O and 29 between the plunger 30 and the piston 2l so that the motion of the plunger causes a smaller but more powerful motion of the piston. The rod 33 is rotated byv hand or by any suitable power. The jack may be used for pushing a bolt out of a hole in some cases, without the gripping means above described.

Having described my invention, what I claim is l. In a device of the class described, the

combination of means for engaging the bolt to be extracted; means for engaging the frame from which'the bolt is to be extracted; a cylinder containing a fluid and adapted to act on the frame engaging means; a piston therein, said piston having a shank extending through the cylinder and adapted to act on the bolt engaging means; a leather cup secured to said piston; a spring pressing outward on said cup to insure a tight contact between the leather cup and the cylinder walls at all ti1nes;a smaller cylinder containing a fluid and connected to said lirst cylinder below the piston; a plunger in said smaller cylinder; and means whereby said plunger may be moved whereby reaction is exerted between the large cylinder andthe piston therein to extract the bolt. i i i 2. In a device of the class described, the combination of means forengaging the bolt to be extracted; means for engaging the frame from which the bolt is to be extracted; acylinder containing a Huid and adapted to act on the frameengaging means; a piston therein, said piston having a shank extending through the cylinder and adaptedto act on the bolt engaging means; a smaller cylinder containing a fluid and connected to.

said first cylinder below the piston; a free plunger in said smaller cylinder; and a screwrod adapted to press against said plunger to move it in said smaller cylinder whereby reaction is exerted between the larger cylinder and the piston therein to extract the bolt.

JOHN A. MAGNUSSON. Witnesses:

P. R. TANZY, GEO. Gr.' GOODMAN.

Copies of this patent may be obtained for five cents each, by addressing' the Commissioner of Patents,

Washington, D. C.

Images