US1408993A - Retaining collar - Google Patents

Retaining collar Download PDF

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Publication number
US1408993A
US1408993A US31334819A US1408993A US 1408993 A US1408993 A US 1408993A US 31334819 A US31334819 A US 31334819A US 1408993 A US1408993 A US 1408993A
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US
United States
Prior art keywords
collar
shaft
locking
pins
position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Eberhardt Ulrich Seth
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NEWARK GEAR CUTTING MACHINE CO
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NEWARK GEAR CUTTING MACHINE CO
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Priority to US31334819 priority Critical patent/US1408993A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/0018Shaft assemblies for gearings
    • F16H57/0025Shaft assemblies for gearings with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B21/00Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/16Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/0894Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with other than axial keys, e.g. diametral pins, cotter pins and no other radial clamping
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S70/00Locks
    • Y10S70/70Geneva stop
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T16/00Miscellaneous hardware [e.g., bushing, carpet fastener, caster, door closer, panel hanger, attachable or adjunct handle, hinge, window sash balance, etc.]
    • Y10T16/18Casters
    • Y10T16/201Pintle retainers
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00Chucks or sockets
    • Y10T279/17Socket type
    • Y10T279/17923Transverse pin
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00Joints and connections
    • Y10T403/70Interfitted members
    • Y10T403/7018Interfitted members including separably interposed key

Description

U. S. EBERHARDT.

RETAINING COLLAR- APPLICATION FILED JULY 25.1919.

. 1,408,993. I v Patented Mar. 7, 1922.

2 SHEETS SHEET 1- INVE/V TOR A TTORNEY U. S. EBERHARDT.

RETAINING COLLAR- APPLICATION FILED JUL! 25, 1919.

1 ,408,99 Patented Mar. 7,1922;

2 SHEETS-SHEET 2.

INVENTOR Mwgd WM' ATTORNEY UNITED STATES PATENT OFFICE.

ULRICH: SETH EIBERHARDT, or MAI'LEWOOD, NEW JERSEY, ASSIGNOR 'ro NEWARK GEAR CUTTING MACHINE 60., OF NEWARK, NEW

JERSEY, A CORPORATION OF Patented Mar. '7, 1922.

Application filed July 25, 1919. Serial No. 313,348.

NEW JERSEY.

. I RETAINING COLLAR.

1 408 993 Specification of Letters Patent.

To all whom it may concern:

Be it known that I, ULRICH SETH EBER- HARDT, a citizen of the United States, and a resident of Maplewood, in the county of Essex and State of New Jersey, have -invented certain new and useful Improvements in Retaining Collars, of which the following is a specification.

This invention relates, generally, to retaining collars, such as are used to hold gears or other machine elements from movement longitudinally of a shaft on which they are mounted, andLparticularly relates to means for positively securing the collar to the shaft and at the same time providing for ready removal of the collar therefrom at the will of the operator.

It has been the practice heretofore in this art to hold retaining collars in place on the shaft by the use either of split pins or nuts. This has given rise to more or less delay and difiEiculty in changing gears when the occasion arose; and it is'one of the objects of this invention to avoid this difficulty and to provide means allowing of the ready removal of the collar without the use of tools or other devices. Not only has the use of the collars heretofore employed given rise to difficulty in their removal, but it has also been the occasion of considerable trouble resulting from the loosening and loss of the holding nut from its retaining position because of the vibrationof the s the nut was mounted.

I have discovered that both difliculties referred to may be overcome by providing a retaining collar which canbe locked into its retaining position and removed therefrom simply by the pressure or action of the fingers of the operator, and which collar at the same time provides a much more efiicient locking means than has heretofore been provided in'the devices that have been known and used.

The preferred, form of m invention con sists in a retaining collar o the desired size which is provided with one or more movable locking members mounted in recesses formed for the purpose in the body thereof, such locking members being accessible to the hand of the operator and normally held by a spring or equivalent means to their locking position in which they engage in a suitable recess or recesses formed on the surface of the shaft on which the collar is mounted.

aft on which Preferably, the lockingv members extend across the length of the shaft in a direction substantially tangential thereto; and, in the preferred form, the locking members are moved along their own axes into and out of locking position. Other forms of the invention herein illustrated show locking members which, instead of being movable along the r own lengths into and' out of locking position, are turned about a pivot, the axis of which may be placed either parallel with or transverse to the axis of the shaft on which the collar is used. In each form of the invention shown, I make use of the most prominent characteristics referred to in the preferred form; that is, the locking member or members is movably mounted in the body portion of the collar member and adapted to be engaged by to be moved out recess formed in length thereof.

The nature of the invention will be best of its locking position in a the fingers of the operator the shaft transverse to the,

with the accompanying drawings, in which- Fig. 1 is a vertical section of a preferred form of retaining collar embodying m invention and showing it in place on a s aft.

Fig. 2 is .an end elevation of the retaining collar shown in Fig. 1.

Fig. 3 is a side elevation of the retaining collar shown in Fig. 1.

Fig. 4 shows, in two views, a side elevation and an end View of the form of locking pin used in the preferred form of the invention.

Fig. .5 1 s a view correspondi to Fig. 1', and showing a modified form 0 the inven- VIEWS.

In the drawings, I have shown at 20 a ortion of the frame-work of a suitable time ine in WhlCh' an enlarged portion 21 forms a hearing for a shaft 22 on which a gear 23 may be mounted, and which it is desired to retain in place on the said shaft in manner to permit of its ready removal therefrom when it is desired to change gears for any desired purpose. 24: designates the retai ing collar embodying my invention, whic'.-, in this embodiment, is provided with looking ins 25 mounted to slide along their own engths in recesses 26 provided for the purpose in the collar 24 in a tangential relation to the central opening 27 in the collar, through which the shaft extends when the dollar is placed thereon. normally urge the pins to their outermost positions in which shoulders 29 formed by notches 30 in the side of the pins, enter, preferably, opposite sides of a'circumferential groove 31 formed in the shaft adjacent the end thereof. In order to prevent the removal of the pinsfrom their positions in the collar, notches 32 are provided in said pins with which stop pins 33 engage. In order to remove the collar from the shaft, it is necessary merely for the operator to grasp the collar in one hand and exert the pressure of his fingers inwardly on opposite sides of the collar, to thereby press the outwardly extending ends of the locking pins 25 and force' the locking shoulders 29 in 'opposite directions out of the locking groove 31. This unlocks the collar, and it can then be withdrawn from the shaft to permit the removal of the gear 23 or other member which the retaining collar served to hold in place. Y

It will be noted that the outer extremities of the lockin pins, which are engaged by the fingers o the o erator, take the same curvature as that o the periphery of the collar so that the operator is aware that, when he has placed the pins in a flush position with relation to the collar, the collar is in an unlocked position, and it is not necessary for him to see the collar in this operation, thereby facilitating the removal of the collars in situations "where lighting is dim or lacking altogether.

I have found that the arrangement of the locking pins in' the particular form described greatly facilitates the operation of removing the collars. This arrangement naturally fits the hand of the operator and makes it a very simple matter to force the pins inwardly against the pressure ofthe springs to their unlocking position. In other words, I have found that, by placing the pins in parallel relation to eachother and in a tangential relation to the relatively small shaft member 22, the general effect is presented of pressing the pins inwardly in opposite radial directions with relation to the collar -member,

and this, produces a very effective arrangement for the operation of the pins.

In another form of the invention, which Suitable springs 28 I have shown in Figs. 5 and 6, I make use of onl a single locking pin 25 for holding the co lar'24. The latter, in this embodiment, contains oiling means such as hole 34- arrangedto have its inner end project into an oil groove 35 formed loilgitudinally with relation to the end of the shaft member 36 on which this specific form of collar is used.

It will be seen that the shaft 36, instead of being provided with a circumferential groove 31, as in Fig. 1, is supplied with merely a. tangentiall arranged groove 37 with which the shoulder-29 on the locking pin 25 engages to hold the collar in its locked position. The purpose of the groove 37 is to determine the angular position of the collar 24' with relation to the shaft in order to bring the oil hole and oil groove in line.

In another embodiment shown in Figs. 7 and 8,.instead of making use of the Ion-- gitudinally slidable pins which have been shown in the figures already described, I employ a pivoted locking member which consists of a. locking bar 38 pivoted on a pin' 39 .extendin transversely of the collar and longitudina 1y of the shaft on which the collar will be placed. In this form of the invention, a spring 40, bearing'against the locking bar 38, preferably outside of the position of the pivot pin 39, serves to force the looking end of the bar 38 into its position in the locking groove 31 of the shaft 22. The position of the pin in its locking position is substantially the same as that of the locking pins already referred to; and, in this'case also, one end of the lockin member extends beyond'the'periphery of t e retaining collar in a position to be engaged by the fingers of the operator .to move the bar against the pressure of the spring 40 to 1015 thereby unlock the collar "and permit of its removal from the shaft. Y

In still another modification of the invention shown in Figs. 9. and 10, I show a locking pin 41.which is arranged-to rotate about its ownaxis into and out of locking sition'. A circumferential groove 42, provi ed near the inner end'of the pin 41, is adapted to be engaged by a retaining pin 43 which serves to prevent the removal of the locking pin from its position in' the. collar, and at the same time permits of the rotation of the pin about its' axis. It will be seen that the position of the pin with relation to a shaft is such that the periphery of the shaft is intersected to a depth sufiicient to afford a secure protection against movement of the collar longitudinally of the shaft; and, when in looking position, thefpin is arranged to engage a groove formed in the shaft for the purlpose. In the position of the pin shown in 'ig. 9, it will be seen that the same is disclosed in its locking relation; and, in. order to move the pin to its unlocked posisltlon, it is necessary merely to grasp the knurled thumb piece 44 and turn to a position where the concave or notched portion 30 is turned about to the side of the pin adjacent the shaft, whereupon the collar can be instantly mounted or removed. In order to hold the pin in its locked and released positions, a small plunger pin 45 is mounted in a recess 46 formed in the collar in a direction transverse to the length of the locking pin, so that the member 45 engages fiat faces 47 formed in the locking pin in opposite sides thereof. A spring 48 interposed between the plunger pin 45 and a screw plug 49 serves to hold the plunger pin 45 in engagement with the locking pin. This spring 48 is not sufficiently powerful, however, to prevent turning of the locking pin from either one of its alternative positions.

It will be seen that I have provided a retaining collar which can be easily placed in locking position and as easily removed therefrom, and that the means provided for holding the retaining collar in place afford a positive lock that absolutely prevents removal of the collar from the shaft on which it is mounted, except by the willful act of the operator.

I I claim:

1. A retaining collar, comprising: a collar member arranged to be fitted to a shaft having a recess in the surface thereof, a movable locking member permanently retained in said collar under resilient control and adapted in its locking position to extend in a direction transverse the length of said shaft and into said recess, whereby longitudinal movement of the collar with relation to the shaft is prevented;

2. A retaining collar, comprising: a collar member arranged to be fitted to a shaft having a recess in the surface thereof, a movable locking member permanently retained in said collar, resiliently actuated in the direction of the recess and adapted in its locking position to extend in a direction transverse the length of said shaft and into said recess, and a spring normally holding the locking member in its locked position. 3. A retaining collar, comprising: a collar member arranged to be fitted to a shaft having a recess in the surface thereof, a movable locking pin permanently. retained in said collar in a position tangentially intersecting the surface of said shaft and adapted in its locking position to extend into said recess, and a cut-out portion in said locking member whereby. when said locking member is moved along its axis to bring the cut-out portion into alignment with said shaft, the collar may be removed from said shaft.

4. A retaining collar, comprising: a collar member arranged to be fitted to a shaft having a, recess in the surface thereof. a movable locking pin permanently retained in said collar in a position tangentially intersecting the surface of said shaft and adapted in its locking position to extend into said recess, a cut-out portion in said locking member whereby, when said locking member is moved along its axis to bring the cut-out portion into alignment with said shaft, the collar may be removed from said shaft, and a spring member normally holding said looking member in a position in which said cutout portion is out of alignment with said shaft to thereby lock the collar against movement with relation to said shaft. v

5. A retaining collar, com rising: a collar member arranged to be fittet to a shaft having a circumferential groove in the surface thereof, a pair of slidable locking pins permanently retained in said collar to engage the circumferential groove, said locking pins having extremities thereof project-ing beyond the periphery of said collar and provided with cut-out grooves in the sides thereof, whereby said pins may be pressed inwardly by the fingers of the operator to bring the cut-out portions into alignment with said shaft to remove the pins out of locking relation with the shaft and permit the removal of the collar.

6. A retaining collar, comprising: a collar member arranged to be fitted to a shaft having a circumferential groove in the surface thereof. a pair of slidable locking pins permanently retained in said collar and arranged in a-parallel relation to each other to engage the circumferential groove on opposite sides of said shaft. said locking pins having extremities thereof projectin beyond the periphery of said collar ancf provided with cut-out grooves in the sides thereof, whereby said pins may be pressed inwardly by the fingers of the operator to bring the cut-out portions into alignment with said shaft to remove the pins out of locking relation with the shaftand permit the removal of the collar.

7. A retaining collar, comprising: a collar member arranged to be fitted to a shaft having a circumferential groove in the surface thereof. slidable locking pins permanently retained'in said collar and arranged to en gage said circumferential groove to lock the collar against removal from said shaft, said pins extending in opposite directions beyond the periphery of said collar. wherebv they may be manipulated by the fingers of the operator to remove the pins into unlocked relation. and springs normally moving the pins into locking relation with said shaft.

Signed at- Newark. in the county of Essex and State of New Jersey. this 21st day of July. A. D. 1919.

ULRICH SETH EBERHARDT.

US31334819 1919-07-25 1919-07-25 Retaining collar Expired - Lifetime US1408993A (en)

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524186A (en) * 1946-06-03 1950-10-03 Beninger Clarence Removable conveyer slat and latch therefor
US2626821A (en) * 1949-02-21 1953-01-27 Western Electric Co Locking type clutch
US2801859A (en) * 1956-01-12 1957-08-06 John F Kopczynski Machine tools
US3070390A (en) * 1959-08-19 1962-12-25 Jean Walterscheid Kommanditges Journal shaft coupling
US3107522A (en) * 1960-02-08 1963-10-22 Gen Motors Corp Self-centering work holder
US3578363A (en) * 1969-04-28 1971-05-11 Sier Bath Gear Co Inc Locking key for coupling
US3653693A (en) * 1965-09-10 1972-04-04 Trw Inc Tubular connector having spring biased coupling means
US3785603A (en) * 1970-10-20 1974-01-15 Apel E Feinmech Adjustable mount
US3806267A (en) * 1972-11-13 1974-04-23 E Systems Inc Coupling apparatus
FR2342453A1 (en) * 1976-02-25 1977-09-23 Welcker F Method for assembling of removable way pipes or similar
US4185935A (en) * 1977-08-25 1980-01-29 Bierlein John W Coupling apparatus
FR2504076A1 (en) * 1981-04-17 1982-10-22 Valeo Mechanical brake control comprising an excentric
US4413499A (en) * 1981-10-13 1983-11-08 Diemer Donald J Rolling key lock for forging die and press
US4480367A (en) * 1982-04-02 1984-11-06 Colt Industries Operating Corp Throttle assembly
EP0566857A1 (en) * 1992-03-12 1993-10-27 RIXEN & KAUL GmbH Device for the attachment of accessoires or equipment
DE19631427A1 (en) * 1996-08-03 1998-02-05 Guenter Dr Ing Frank Two=part shaft-hub locking clamp
US20030217622A1 (en) * 2002-05-21 2003-11-27 Hand Tool Design Corporation Replaceable tool tip
US20090136294A1 (en) * 2005-09-02 2009-05-28 The Boeing Company Multi-Piece Fastener with Self-Indexing Nut
US20090269133A1 (en) * 2008-04-29 2009-10-29 Caterpillar Work Tools B.V. Locking device for grappling links
DE102010055857A1 (en) 2010-12-22 2012-06-28 Rixen & Kaul Gmbh Quick coupling for fastening of accessories, has anchor, head with undercuts, closing piece, housing and two lock bars guided in housing, where joint connection is provided between anchor and closing piece
US20120224934A1 (en) * 2011-03-01 2012-09-06 Gourmet Equipment (Taiwan) Corporation Fastener
US20170036336A1 (en) * 2016-10-25 2017-02-09 Caterpillar Inc. Hammer assembly

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524186A (en) * 1946-06-03 1950-10-03 Beninger Clarence Removable conveyer slat and latch therefor
US2626821A (en) * 1949-02-21 1953-01-27 Western Electric Co Locking type clutch
US2801859A (en) * 1956-01-12 1957-08-06 John F Kopczynski Machine tools
US3070390A (en) * 1959-08-19 1962-12-25 Jean Walterscheid Kommanditges Journal shaft coupling
US3107522A (en) * 1960-02-08 1963-10-22 Gen Motors Corp Self-centering work holder
US3653693A (en) * 1965-09-10 1972-04-04 Trw Inc Tubular connector having spring biased coupling means
US3578363A (en) * 1969-04-28 1971-05-11 Sier Bath Gear Co Inc Locking key for coupling
US3785603A (en) * 1970-10-20 1974-01-15 Apel E Feinmech Adjustable mount
US3806267A (en) * 1972-11-13 1974-04-23 E Systems Inc Coupling apparatus
FR2342453A1 (en) * 1976-02-25 1977-09-23 Welcker F Method for assembling of removable way pipes or similar
US4111470A (en) * 1976-02-25 1978-09-05 Welcker F Releasable coupling and method for making such coupling
US4185935A (en) * 1977-08-25 1980-01-29 Bierlein John W Coupling apparatus
FR2504076A1 (en) * 1981-04-17 1982-10-22 Valeo Mechanical brake control comprising an excentric
US4522286A (en) * 1981-04-17 1985-06-11 Gino Villata Brake control device
US4413499A (en) * 1981-10-13 1983-11-08 Diemer Donald J Rolling key lock for forging die and press
US4480367A (en) * 1982-04-02 1984-11-06 Colt Industries Operating Corp Throttle assembly
EP0566857A1 (en) * 1992-03-12 1993-10-27 RIXEN & KAUL GmbH Device for the attachment of accessoires or equipment
US5474270A (en) * 1992-03-12 1995-12-12 Rixen & Kaul Gmbh Clamping device
DE19631427A1 (en) * 1996-08-03 1998-02-05 Guenter Dr Ing Frank Two=part shaft-hub locking clamp
US20030217622A1 (en) * 2002-05-21 2003-11-27 Hand Tool Design Corporation Replaceable tool tip
US6732617B2 (en) * 2002-05-21 2004-05-11 Hand Tool Design Corporation Replaceable tool tip
US20090136294A1 (en) * 2005-09-02 2009-05-28 The Boeing Company Multi-Piece Fastener with Self-Indexing Nut
US8142126B2 (en) 2005-09-02 2012-03-27 The Boeing Company Multi-piece fastener with self-indexing nut
US8555481B2 (en) 2005-09-02 2013-10-15 The Boeing Company Multi-piece fastener with self-indexing nut
US20090269133A1 (en) * 2008-04-29 2009-10-29 Caterpillar Work Tools B.V. Locking device for grappling links
DE102010055857A1 (en) 2010-12-22 2012-06-28 Rixen & Kaul Gmbh Quick coupling for fastening of accessories, has anchor, head with undercuts, closing piece, housing and two lock bars guided in housing, where joint connection is provided between anchor and closing piece
US20120224934A1 (en) * 2011-03-01 2012-09-06 Gourmet Equipment (Taiwan) Corporation Fastener
US20170036336A1 (en) * 2016-10-25 2017-02-09 Caterpillar Inc. Hammer assembly

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