US3050838A - Safety tool for removing snap rings - Google Patents

Safety tool for removing snap rings Download PDF

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Publication number
US3050838A
US3050838A US834441A US83444159A US3050838A US 3050838 A US3050838 A US 3050838A US 834441 A US834441 A US 834441A US 83444159 A US83444159 A US 83444159A US 3050838 A US3050838 A US 3050838A
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snap ring
tool
lever
ball
fulcrum
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US834441A
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Jr Posy G Stultz
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/20—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same inserting or withdrawing split pins or circlips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0028—Tools for removing or installing seals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53613—Spring applier or remover
    • Y10T29/5363—Circular spring

Definitions

  • the present invention relates to safety tool for removing snap rings and constitutes a special form of tool for removing the snap rings from the valve bridge stems of hydraulic lash adjustens of diesel engines although the tool, in the form illustrated and disclosed herein, or in any modified form thereof, may be employed to safely remove snap rings in other environments once the snap ring has been expanded by a conventional form of expander tool.
  • the invention is a complementary tool to that disclosed in the copending application of Phillips, and Stultz, Serial No. 768,871. See in this connection more particularly FIGURE 16 of said application Serial No. 768,871 which shows the coil spring and its cap piece depressed by a claw on the center toggle lever so that the snap ring is exposed for removal vby a usual form of expander tool fitting in the gap between the ends of the spring snap ring, which latter springs into a circular groove in the bridge stem to retain the cap and the coil spring in place.
  • ⁇ It is therefore an object of the invention to provide a tool for removing snap rings in the expanded and tensioned condition thereof which involves a safety factor in that the snap ring is made captive by the tool incident to its release from the part in which it normally seats and to this end the tool comprises complemental fulcrurn and toe so positioned relatively to one another that in the act of prying the snap ring from the groove or from the part normally carrying the same such snap ring will be entrained by the fulcrum and held against escape while it is entirely free to contract to its normal constricted dimension or in other words to its unsprung condition whereby with perfect safety the same may be then removed from the tool.
  • the improved safety tool of this invention does not take the place of the expander tool but supplements the action thereof.
  • a further object of the invention is to accomplish the foregoing ends and purposes by an extremely simple form of mechanical tool having a facile application to the work and the mechanically simple and easy movement in the act of removing the snap ring.
  • FIGURE l is a fragmentary side elevational view corresponding generally to FIGURE 1:6 of the prior application Serial No. 768,871 aforesaid showing the initial position of application of the improved tool to the snap ring of the bridge stem.
  • FIGURE 2 is a similar view showing the tool moved to an intermediate position seating the fulcrurn and in position genenally to admit of the application of the expander tool to expand the snap ring.
  • FIGURE 3 is a similar view showing a third position of the lever incident to downward thrust upon its handle with the consequent lifting of one side of the expanded snap ring.
  • yFIGURE 4 is a bottom plan View of a form of tool constructed in accordance with the present invention.
  • 10 designates a bar lever having a shank 1t)a angularly disposed with respect thereto extending off one end of the bar 10 and having a curved or other form of handle 11 formed at its other end.
  • the bar 10 or its shank 10a carries la foot 1-2 at the end opposite the handle 11 which foot extends generally in a direction normal to the plane lof the shank 10B.
  • the foot 12 At its lower free end the foot 12 carries an angle toe 13 which has a laterally curved free edge 13EL (FIGURE 4) for c011- forl ing generally to the -surface of the bridge stem 16.
  • T he shank lila on. its underside carries a fulcrum 14 which in the form of tool disclosed herein isY generally in the form of a ball or sphere. This fulcrum 14 is spaced from the toe A13.
  • the bridge stem 16 is hollow and at its upper end is provided with a haring 'mouth 17 providing a seat for the ball 14.
  • the stem 16 is formed with an external circular groove 118 in which is adapted to seat a split resilient snap ring E.
  • a coil spring 20 surrounds the stem 16 and urges a cap '21 upwardly normally abutting the snap ring 19.
  • At 22 is represented the cla-w of an instrument for depressing the cap 21 and compressing the coil spring 20, such claw being a part of the tool of the copending application Serial No. 768,871 aforesaid.
  • the claw 22 is made to force the cap 21 downwardly and to compress the spring Ztl so as to expose the snap ring for the removal movement.
  • the safety tool of this invention is then initially applied in the position of FIGURE l with t-he toe 13 entered beneath the snap ring 19 at one side and with the ball fulcrum 14 poised above the iiaring mouth 17 and with the bar lever 16 in the diagonal position shown.
  • the bar lever y1l? is thereupon rocked down to the left to settle the ball 14 upon the mouth seat 17, the parts assuming the position of FIGURE 2; whereupon the expander tool is applied to the split ends of the snap ring 19 and when the snap ring is expanded clear of the groove v155, the handle 11 is depressed further to the position of FGURE 3, rocking on the ball 14 and elevating the toe 13 beneath the snap ring.
  • the snap ring is accordingly lifted olf the stem 16 and into a position surrounding the ball 14 which coniines the snap ring 19 throughout the entire 360 and thus prevents the snap ring from flying oit in any direction.
  • the bar 10 will prevent escape of the snap ring 19 lupwardly and the foot 12 and toe 13 will also contribute tov/ard coniining the snap ring 19.
  • 'Ihe diameter of the ball 14 will preferably be only slightly less than the diameter of the snap ring in its contracted condition. rllhis diameter of the ball 14 is of counse in excess of the width of the gap between the split ends of the snap ring 19 in the expanded condition thereof.
  • the ball fulcrum 14 extends down from the shank 10a of the bar lever 1@ to a lower point than the toe 13.
  • the relationship between'the ball fulcrum 14 and the toe 13 is such that the toe levers the snap ring 19 onto the ball fulcrum 14 immediately the snap ring is forced above the upper end of the stem 16 so that the snap ring 19 has no opportunity for escape in its sprung condition. There is no place for the snap ring to go except about the ball fulcrum 14 where it is free to immediately contract in a restrained and restricted area.
  • the safety tool may be gradually turned over so that ultimately the snap ring 19 will rest on .the shank 10a of the bar while the snap ring still surrounds the ball 14.
  • the snap ring in its unsprung condition can thereupon be easily lifted olf the ball with perfect safety.
  • the ball or sphere fulcrum 14 has an outer hemisphere by Vwhich is meant more remote from the lever portion 10au and an inner hemisphere by which is lmeant Vadjacent the levery portion-10a carrying the ballfulcrum 14. 11n FIGURE 2,
  • the Y two Vhemispheres may be also characterized as'lower and spherical surface tapering upwardly from the central plane towardl the lever part'lt)2v and thus forms walls which are progressively diminishing in cross section from the central plane to the attachment to the lever part 19a.
  • lt is'this upper hemisphere that functions primarily to entrap and make captive the snap ring 19 when it is lifted olf the end of the stem 16 by the angle toe 13. -It must be remembered that when the snap ring 19 is lifted out of its groove 18, it is expanded and under stress.
  • a safety tool for removing the snap ring and making the snap ring captive to the tool comprising a lever, aY ring-engaging member at an end portion of the lever for engaging the ring and shifting the same from its seat and oi the end of the stem when the ring is expanded, and a fulcrum member on the lever spaced from the ringengaging member of ball form having a central equatorial plane spaced from and substantially parallel to the lever portion carrying the fulcrum member and dividing the ball fulcrum into inner and outer hemispheres, said outer best form of the i hemisphere adapted to enter and rock on the flaring mouth with the inner hemisphere having a part-'spherical wall diminishing in cross section progressively from the central plane toward the lever for guiding the Vfreed'and con-V tracting snap ring to the diminishing cross section
  • a safety tool for removing the snap ring and making the snap ring captive to the tool corn- ⁇ (c) a fulcrum member on the -lever spaced from the ring-engaging member having at its outer portion remote from the lever a fulcrum adapted to enter and rock on the ilaring mouth,
  • said ring-engaging member comprising afoot and Y
  • said foot depending from the lever at a point displaced substantially from the fulcrum member toV References Cited in the le of this patent UNITED STATES PATENTS 2,728,250 Robert Dec. 27, 1955 Ranseen Apr. 27, 1948'

Description

Aug' 23, 1962 P. G. sTUL-rz, JR 3,050,838
SAFETY TOOL FOR REMOVING SNAP RINGS Filed Aug. 18, 1959 "Tamm-.
INVENTOR "s Posy G. Stul'rz Jr.
BY WWWZQMWQ ATTORNEY United States Patent Olice 3,050,838 Patented Aug. 28, 1962 The present invention relates to safety tool for removing snap rings and constitutes a special form of tool for removing the snap rings from the valve bridge stems of hydraulic lash adjustens of diesel engines although the tool, in the form illustrated and disclosed herein, or in any modified form thereof, may be employed to safely remove snap rings in other environments once the snap ring has been expanded by a conventional form of expander tool.
The invention is a complementary tool to that disclosed in the copending application of Phillips, and Stultz, Serial No. 768,871. See in this connection more particularly FIGURE 16 of said application Serial No. 768,871 which shows the coil spring and its cap piece depressed by a claw on the center toggle lever so that the snap ring is exposed for removal vby a usual form of expander tool fitting in the gap between the ends of the spring snap ring, which latter springs into a circular groove in the bridge stem to retain the cap and the coil spring in place.
The problem has been that, when the expander tool expands the resilient snap ring, the latter is thereby put under high elastic tension and the snap ring often escapes from` the tool and will fly in any unpredictable direction, often injuring eyes or inflicting injury on the operator or bystanders. `It is therefore an object of the invention to provide a tool for removing snap rings in the expanded and tensioned condition thereof which involves a safety factor in that the snap ring is made captive by the tool incident to its release from the part in which it normally seats and to this end the tool comprises complemental fulcrurn and toe so positioned relatively to one another that in the act of prying the snap ring from the groove or from the part normally carrying the same such snap ring will be entrained by the fulcrum and held against escape while it is entirely free to contract to its normal constricted dimension or in other words to its unsprung condition whereby with perfect safety the same may be then removed from the tool.
The improved safety tool of this invention does not take the place of the expander tool but supplements the action thereof.
A further object of the invention is to accomplish the foregoing ends and purposes by an extremely simple form of mechanical tool having a facile application to the work and the mechanically simple and easy movement in the act of removing the snap ring.
With the foregoing and other objects in View, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.
In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views:
FIGURE l is a fragmentary side elevational view corresponding generally to FIGURE 1:6 of the prior application Serial No. 768,871 aforesaid showing the initial position of application of the improved tool to the snap ring of the bridge stem.
FIGURE 2 is a similar view showing the tool moved to an intermediate position seating the fulcrurn and in position genenally to admit of the application of the expander tool to expand the snap ring.
FIGURE 3 is a similar view showing a third position of the lever incident to downward thrust upon its handle with the consequent lifting of one side of the expanded snap ring.
yFIGURE 4 is a bottom plan View of a form of tool constructed in accordance with the present invention.
Referring more particularly to the drawings, 10 designates a bar lever having a shank 1t)a angularly disposed with respect thereto extending off one end of the bar 10 and having a curved or other form of handle 11 formed at its other end.
The bar 10 or its shank 10a carries la foot 1-2 at the end opposite the handle 11 which foot extends generally in a direction normal to the plane lof the shank 10B. At its lower free end the foot 12 carries an angle toe 13 which has a laterally curved free edge 13EL (FIGURE 4) for c011- forl ing generally to the -surface of the bridge stem 16.
T he shank lila on. its underside carries a fulcrum 14 which in the form of tool disclosed herein isY generally in the form of a ball or sphere. This fulcrum 14 is spaced from the toe A13.
The bridge stem 16 is hollow and at its upper end is provided with a haring 'mouth 17 providing a seat for the ball 14. The stem 16 is formed with an external circular groove 118 in which is adapted to seat a split resilient snap ring E. A coil spring 20 surrounds the stem 16 and urges a cap '21 upwardly normally abutting the snap ring 19. At 22 is represented the cla-w of an instrument for depressing the cap 21 and compressing the coil spring 20, such claw being a part of the tool of the copending application Serial No. 768,871 aforesaid.
In the operation of the device, the claw 22 is made to force the cap 21 downwardly and to compress the spring Ztl so as to expose the snap ring for the removal movement.
The safety tool of this invention is then initially applied in the position of FIGURE l with t-he toe 13 entered beneath the snap ring 19 at one side and with the ball fulcrum 14 poised above the iiaring mouth 17 and with the bar lever 16 in the diagonal position shown.
The bar lever y1l? is thereupon rocked down to the left to settle the ball 14 upon the mouth seat 17, the parts assuming the position of FIGURE 2; whereupon the expander tool is applied to the split ends of the snap ring 19 and when the snap ring is expanded clear of the groove v155, the handle 11 is depressed further to the position of FGURE 3, rocking on the ball 14 and elevating the toe 13 beneath the snap ring. The snap ring is accordingly lifted olf the stem 16 and into a position surrounding the ball 14 which coniines the snap ring 19 throughout the entire 360 and thus prevents the snap ring from flying oit in any direction. The bar 10 will prevent escape of the snap ring 19 lupwardly and the foot 12 and toe 13 will also contribute tov/ard coniining the snap ring 19. 'Ihe diameter of the ball 14 will preferably be only slightly less than the diameter of the snap ring in its contracted condition. rllhis diameter of the ball 14 is of counse in excess of the width of the gap between the split ends of the snap ring 19 in the expanded condition thereof. In the position of FIGURE 3, it will be noted that the ball fulcrum 14 extends down from the shank 10a of the bar lever 1@ to a lower point than the toe 13. The relationship between'the ball fulcrum 14 and the toe 13 is such that the toe levers the snap ring 19 onto the ball fulcrum 14 immediately the snap ring is forced above the upper end of the stem 16 so that the snap ring 19 has no opportunity for escape in its sprung condition. There is no place for the snap ring to go except about the ball fulcrum 14 where it is free to immediately contract in a restrained and restricted area.
As the snap ring 19 comes off the stem 16 the safety tool may be gradually turned over so that ultimately the snap ring 19 will rest on .the shank 10a of the bar while the snap ring still surrounds the ball 14. The snap ring in its unsprung condition can thereupon be easily lifted olf the ball with perfect safety.
As shown more particularly in FIGURE 2, the ball or sphere fulcrum 14 has an outer hemisphere by Vwhich is meant more remote from the lever portion 10au and an inner hemisphere by which is lmeant Vadjacent the levery portion-10a carrying the ballfulcrum 14. 11n FIGURE 2,
which is theV position of initial placement of the tool, the Y two Vhemispheres may be also characterized as'lower and spherical surface tapering upwardly from the central plane towardl the lever part'lt)2v and thus forms walls which are progressively diminishing in cross section from the central plane to the attachment to the lever part 19a. lt is'this upper hemisphere that functions primarily to entrap and make captive the snap ring 19 when it is lifted olf the end of the stem 16 by the angle toe 13. -It must be remembered that when the snap ring 19 is lifted out of its groove 18, it is expanded and under stress. While these snap rings are small they must be of strong constictive Yetort, consequently a substantial force is necessary to :pry the split ends apart and even on fractional opening at the split ends the snap ring acquires tremendous reactive stress which is the property that causes these snap rings to suddenly and with great momentum release themselves with inurious effect to operators and bystanders. As soon as the ring comes oi the upper end of the steam 16, it will snap back to nnsprung form and in doing so its inner wall will contact the upwardly tapering part-spherical wall of the upper or inner hemisphere and the ring will ordinarily vibrate rapidly around and laterally of this upper hemisphere being deflected upwardly thereby toward the lever'part 10a and being made captive thereby and prevented from re-assuming any position outwardl of the stem 16. l Y
Although I have disclosed herein the invention known to me at this time, I reserve the right to all such modifications and changes as may comerwithinY the scope of the following claims.
What is claimed is: Y
1. For use with a stem having a flaring mouth at a free end thereof and a seat close to the free end for a split resilient snap ring, a safety tool for removing the snap ring and making the snap ring captive to the tool comprising a lever, aY ring-engaging member at an end portion of the lever for engaging the ring and shifting the same from its seat and oi the end of the stem when the ring is expanded, and a fulcrum member on the lever spaced from the ringengaging member of ball form having a central equatorial plane spaced from and substantially parallel to the lever portion carrying the fulcrum member and dividing the ball fulcrum into inner and outer hemispheres, said outer best form of the i hemisphere adapted to enter and rock on the flaring mouth with the inner hemisphere having a part-'spherical wall diminishing in cross section progressively from the central plane toward the lever for guiding the Vfreed'and con-V tracting snap ring to the diminishing cross section of the inner `hemisphere and toward, the lever', the diameter of the ball fulcrum being slightly less than the internal diameter of the snap ring in its contracted condition and greater than the Width of the gap between the split ends of the snap ring in the expanded condition ofthe snap ring.
v2. For use with a stem having a flaring mouth at a free end thereof and =a seat close to the free end for a split resilient snap ring, a safety tool for removing the snap ring and making the snap ring captive to the tool corn-` (c) a fulcrum member on the -lever spaced from the ring-engaging member having at its outer portion remote from the lever a fulcrum adapted to enter and rock on the ilaring mouth,
(d said fulcrum member also having adjacent the lever a part-spherical portion having its greatest crosssection spaced from and substantiallyV parallel tothe Y lever portion carrying the fulcrum member,
(e) said part-spherical portion diminishing in crosssection progressively from said greatest cross-section toward the lever for guiding the freed and contracting snap ring to the diminishing cross-section and toward the lever, Y
(f) said greatest cross-section being slightly less than the internal diameter of the snap ring in its contracted condition and greater than the width ofthe gap between the split ends of the snap ringfin the expanded condition of the snap ring,
(g) said ring-engaging member comprising afoot and Y (h) a toe on the foot, (i) said foot depending from the lever at a point displaced substantially from the fulcrum member toV References Cited in the le of this patent UNITED STATES PATENTS 2,728,250 Robert Dec. 27, 1955 Ranseen Apr. 27, 1948'
US834441A 1959-08-18 1959-08-18 Safety tool for removing snap rings Expired - Lifetime US3050838A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974441A (en) * 1989-09-26 1990-12-04 Keeney Jeffrey A Ductwork clip uncrimper
US5988017A (en) * 1997-09-16 1999-11-23 Eet Tn Corporation Safety web lid retainer for waste drum
US6058808A (en) * 1998-08-18 2000-05-09 Eet Tennessee Corporation Safety web lid retainer for waste drum
US20060219058A1 (en) * 2005-04-04 2006-10-05 Mr. Christopher Farentinos Bottle Opener

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440485A (en) * 1944-03-11 1948-04-27 Mauritz C Ranseen Cap-lifting bottle opener
US2728250A (en) * 1954-12-13 1955-12-27 Hector L Robert Crown closure removing and collecting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440485A (en) * 1944-03-11 1948-04-27 Mauritz C Ranseen Cap-lifting bottle opener
US2728250A (en) * 1954-12-13 1955-12-27 Hector L Robert Crown closure removing and collecting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974441A (en) * 1989-09-26 1990-12-04 Keeney Jeffrey A Ductwork clip uncrimper
US5988017A (en) * 1997-09-16 1999-11-23 Eet Tn Corporation Safety web lid retainer for waste drum
US6058808A (en) * 1998-08-18 2000-05-09 Eet Tennessee Corporation Safety web lid retainer for waste drum
US20060219058A1 (en) * 2005-04-04 2006-10-05 Mr. Christopher Farentinos Bottle Opener

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