US2924006A

US2924006A - Extractor tool

Info

Publication number: US2924006A
Authority: US
Publication date: 1960-02-09
Anticipated expiration: 1977-02-09

Description

E. L. BOE

EXTRACTOR TOOL Filed Dec. 14, 1956 INVENTOR. ERNEST L. BoE BY 5 OF 8 Q W-HORHByS Feb. 9, 1960 EXTRACTOR TOOL Ernest L. Boe, Blair, Wis.

Application December 14, 1956, Serial No. 628,351

4 Claims. (Cl. 29-280) This invention relates to an extractor tool of the type which is particularly suited for removing or extracting hollow objects from an opening.

The tool has found particular use in extracting'assembly dowels such as those employed in aligning the heads of internal combustion engines with the engine block during assembly thereof. In practice tubular dowels are employed in the threaded bores in the top of the engine blockand extend upwardly therefrom to guide and locate the engine head as the latter is applied to the engine block. An opening in the head is adapted to receive the upper exposed end of the dowel. After the dowel is removed by the present tool the opening in the head remains aligned with the corresponding threaded bore in the engine block for receiving the usual fastening bolts.

According to the invention, the extractor tool comprises a hollow member which is adapted to extend into the opening and through a hollow object to be extracted from the opening. A rotatable shaft is eccentrically mounted within the hollow member with the ends of the shaft extending beyond the respective ends of the hollow member. An extractor element is fixedly secured on one end of the shaft in alignment with the axis of the hollow member. Means are provided on the opposite outer end of the shaft for rotating the shaft and thereby moving the extractor element eccentrically with respect to the hollow member so that a portion of the extractor element extends radially outward beyond the hollow member.

In service, the end of the tool bearing the extractor element is inserted into the opening and through the hollow object to be extracted from the opening. The shaft is then rotated to eccentrically move the extractor element so that a portion thereof extends beyond the hollow member to a position engageable with the end of the object to be extracted farthest removed from the entry end of the opening. Extraction is then simply effected by pulling the tool along with the object axially from the opening.

The drawings furnished herewith illustrate the best mode of carrying out the invention as presently contemplated and set forth hereinafter.

In the drawings:

Figure l is a sectional view of the extractor tool of this invention showing the position of the operable elements as the tool is inserted into an opening from which a hollow object is to be extracted; and

Figure 2 is a view similar to .that of Figure 1 showing the operable elements of the extractor tool in position to effect extraction.

Refering to the drawings, there is shown an extractor tool as may be used to remove an annular member 1 which serves to align the openings 2 and 3 of members 4 and 5 during the assemblage of the members. The elongated opening 6 formed by aligned openings 2 and 3 is adapted to receive a threaded member, not shown, upon removal of the annular member 1, to secure the members 4 and 5 together.

United States Patent 0 'ice The extractor tool comprises an elongated tubular member 7 having a relatively thick external flange or shoulder 8 adjacent the upper end thereof to provide means for gripping the tool.

The ends of the tubular member 7 are closed off by a pair of spaced bushings 9 and 10 fixedly secured within the member. Bushings 9 and 10 are provided with aligned openmgs 11 and 12 respectively which are offset from the central axis of the member 7. The shaft 13 is rotatably disposed in the openings 11 and 12. and extends lengthwise beyond the ends of member 7.

A spring washer 14 is disposed around the upper end of shaft 13 and seats against the bushing 9. The washer 14 serves as a bearing for the rotatable handle member 15 which is fixedly secured to the shaft 13 and provides a means for rotating the shaft.

A11 extracting element 16 is secured to the lower end of shaft 13 in alignment with the tubular member 7 and eccentric to the shaft. The element 16 has a generally flat engaging surface 17 bearing against the surface of bushing 10 at the lower end of tubular member 7. Spring washer 14 is axially compressed between bushing 9 and handle member 15 to provide the bearing pressure that may be desirable between element 16 and bushing Upon rotation of shaft 13 the element 16 is moved eccentrically with respect to tubular member 7 to expose a portion of the engaging surface 17 outwardly of the tubular member.

Pin means 18 associated with handle member 15 extends through hole 21 and is provided to selectively lock the shaft 13 and extracting element 16 in place. A hole 19 is provided in the upper flange 8 and is adapted to receive the pin means 18 when the extracting element 16 is rotated into alignment with tubular member 7. A second hole 20 for receiving pin means 18 is provided in flange 8 diametrically opposed from hole 9 whereby the extracting element 16 may be locked in its position of maximum eccentricity as shown in Figure 2 to provide maximum exposure of surface 17 outwardly of tubular member 7 for engaging the annular member 1. Other holes, not shown, may be provided in flange 8 between the extreme positions of

holes

19 and 20 for receiving the pin means 18 and locking the extracting element 16 to provide varying amounts of exposure of engaging surface 17 outwardly of member 7.

In operation, the extracting element 16 of the tool is ordinarily-locked in alignment with tubular member 7 prior to insertion into an opening so that there will be a minimum of interference upon entering. The extracting end of the tool is then inserted into the opening and through the annular object to be withdrawn from the opening such as the annular aligning member 1 disposed in opening 6 as shown in the drawings. After the extracting element 16 has fully passed through the annular object to be extracted, the shaft 13 is rotated by means of the handle member 15 to rotate the extracting element eccentrically of member 7 and provide an exposure of engaging surface 17 on element 16 for engaging the end of the annular object 1 farthest removed from the entrance of the opening. Removal of the annular object may then be effected by pulling the tool together with the annular object from the opening.

The diameter of tubular member 7 should be nearly that of the inside bore of hollow member 1 so that after adjustment of the element 16 eccentric of the member 7 there will be no danger of the member 7 moving laterally in the bore of member 1 and allowing the element 16 to slip upwardly through the bore. In other words the maximum diameter of the tool when collapsed as when element 16 is in alignment with member 7 should be less than the diameter of the bore in member 1,

:and the maximum diameter of the tool when extended as when element 16 is adjusted to maximum eccentricity relative to member 7 should be greater than the diameter of the bore in member 1.

Various modes of carrying out the invention are contemplated, as, being within the scope of the. following claims particularly pointing out and distinctly, claiming the subject matter which is regarded as the invention.

I claim: 7

1. An extractor tool for removing an annular object from a relatively deep opening, comprising a body member having a lower end adapted to be inserted longitudinally into the opening and through the object to be extracted, a shaft member rotatably carried within the body member eccentrically of the longitudinal axis thereof with the ends of the shaft member extending beyond the respective ends of the body member, means provided on said members to substantially restrain axial movement therebetween, an extractor element fixedly secured to the lower end of the shaft member in alignment with said body member and having an upper surface adapted to engage the object to be extracted, handle means secured to the upper end of the shaft member whereby to rotate the shaft member and eccentrically move the extractor element out of alignment with the body member to expose a portion of the upper engaging surface of said element outwardly of said body member for engagement with the end of the object to be extracted farthest removed from the entrance to the opening, and locking means on said handle means for engaging the body member and thereby lock the handle means relative to the body member and secure the shaft member and extractor element against rotation relative to the body member.

2. An extractor tool for removing an annular object from a relatively deep opening, comprising a tubular body member having a lower end adapted to be inserted into the opening and through the object to be extracted, bearing members closing off the ends of the body member and having aligned apertures offset from the center of the body member, a shaft journaled in said apertures with the ends of the shaft extending axially beyond the bearing member, an extractor element having maximum lateral dimension corresponding substantially to that of the body member and fixedly secured to the lower end of the shaft adjacent to the lower bearing member in alignment with the body member and having an upper engaging surface, handle means fixedly secured to the upper end of the shaft adjacent to the upper bearing member whereby to rotate the shaft and eccentrically move the extractor element out of alignment with the body member to expose a portion of the upper engaging surface of said element outwardly of said body member for engagement with the end of the object to be extracted farthest removed from the entrance to the opening, said extractor element and handle means together further serving to substantially restrain the body member against movement axially relative to the shaft, and locking means associated with said handle means and adapted for securing the shaft and extractor element against rotation from a preselected position.

3. An extractor element as set forth in claim 2 wherein the tubular body member is provided with a flange at the upper end thereof, and the locking means comprises a pin member extending through the handle means and engageable with a plurality of holes provided in said flange, said holes being angularlyspaced and adapted to selectively receive. said pin member to lock the. extractor element against rotation in preselected positions between its position in alignment with thebody member and its position of maximum eccentricity.

4. An extractor tool for removing an annular object from a relatively deep opening, comprising a tubular body member having a lower end adapted to be inserted. into the opening and through the object to be extracted, bearing members closing off the ends of the body member and having aligned apertures offset from the center of the body member, a shaft journaled in said. apertures with the ends, of the shaft extending axially beyond the bearing members, an extractor element having maximum lateral dimension corresponding substantially to that of the body member and fixedly secured to the lower end of the shaft adjacent to the lower bearing member in alignment with the body member and having an upper engaging surface, handle means fixedly secured to the upper end of the shaft whereby to rotate the shaft and eccentric-ally move the extractor element out of alignment with the body member to expose a portion of the upper engaging surface of said element outwardly of said body member for engagement with theendof the object to be extracted farthest removed from the entrance to. the opening, and spring means on said shaft between the handle means and the upper bearing member for effecting bearing engagement of. said'upperengaging surface of said extractor element and the lower end of said lower bearing member to retain said' shaft in any position of adjustment and substantially restrainv the body member againstmovement axially relative to the shaft.

References Cited in the file of'thispatent UNITED STATES PATENTS Wollensak Apr. 24, 1888