US20090235755A1 - Rotating dovetail connection for materials testing - Google Patents

Rotating dovetail connection for materials testing Download PDF

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Publication number
US20090235755A1
US20090235755A1 US12/322,386 US32238609A US2009235755A1 US 20090235755 A1 US20090235755 A1 US 20090235755A1 US 32238609 A US32238609 A US 32238609A US 2009235755 A1 US2009235755 A1 US 2009235755A1
Authority
US
United States
Prior art keywords
connection
holder
tongue
bore
jaw
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.)
Abandoned
Application number
US12/322,386
Other languages
English (en)
Inventor
James Brittain Smallwood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Priority to US12/322,386 priority Critical patent/US20090235755A1/en
Assigned to ILLINOIS TOOL WORKS INC. reassignment ILLINOIS TOOL WORKS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SMALLWOOD, JAMES BRITTAIN
Priority to DE200910009733 priority patent/DE102009009733B4/de
Priority to CN200910126799.8A priority patent/CN101551312B/zh
Priority to JP2009064685A priority patent/JP5551375B2/ja
Publication of US20090235755A1 publication Critical patent/US20090235755A1/en
Priority to US14/854,246 priority patent/US9377385B2/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0268—Dumb-bell specimens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0405—Features allowing alignment between specimen and chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws

Definitions

  • the present invention pertains to a device for use in material testing equipment and accessories. More specifically, the present invention pertains to a mechanism for the connection of removable jaw faces to material testing grips.
  • materials testing systems are used in a variety of industries and are generally used with some sort of accessory to provide specimen gripping or holding. Many of these tests require that the accessories have specific gripping surfaces or sizes.
  • the size and type of gripping surface needed can vary greatly from test to test, making jaw face changes a frequent event in many labs. Therefore, removable jaw faces with various sizes and surfaces are a common commodity in the materials testing industry.
  • connection mechanisms include simple pin and aperture connections as well as rigid dovetail connections. Each mechanism has advantages and disadvantages.
  • Zwick has implemented the use of a rigid dovetail connection as shown in FIG. 1 .
  • This connection method allows for a repeatable location for the jaw face while allowing for ease of installation. Rotation of the jaw faces is not possible with this method rendering fixed the position of the jaw faces relative to the gripped specimen. Furthermore, a tool must be used to connect these jaw faces to their holders.
  • MTS has implemented an externally accessible pin and a corresponding aperture to connect the jaw faces to the grips as shown in FIG. 2 .
  • This allows for jaw face rotation but poses a potential safety issue because the protruding heads and rings of the pins also move in conjunction with the jaw faces.
  • the pull rings used for removing the pins may also get entangled in the grips.
  • External pins may also be ejected from the apertures if measures are not taken to retain them in the grips. It appears that this has been addressed with the addition of an O-ring to the end of the pin. Additionally, the pins are a loose part which may be easily lost.
  • Instron the assignee of the present application, has implemented four jaw face to grip connection methods of interest. These method include set screw and groove; internal pin an aperture; internal pin and retaining wire; and hook and fixed pin. All of these methods allow the jaw faces to rotate. This rotation is needed to compensate for both inconsistencies in specimen thickness and elastic deformation of grip bodies during testing.
  • the set screw and groove method as shown in FIG. 3 is a simple and inexpensive method that requires a tool for installation.
  • the set screws provide the pivot point for jaw face rotation. Faces typically rotate slightly in all directions with this connection method.
  • the internal pin and aperture method as shown in FIG. 4 has been perhaps the most common jaw face connection method used to date and has been adopted by various competitors. While this is perhaps the least expensive and least complicated method, there are some drawbacks. For instance, installation often requires an experienced user or an additional person to hold and manipulate the various components. Additionally, the pins may not maintain their positional integrity during testing. A slight displacement may typically be remedied by the retraction of the holders into the grip body, but occasionally it results in the pin and jaw face falling partially or completely out of the holder. Another drawback is that the pins are small loose parts which can be easily dropped or lost.
  • the internal pin and retention wire method was developed by the present assignee for use on side-acting screw action grips and uses a semi-permanent pin installed in the back of a typical pin and aperture jaw face as shown in FIG. 5 .
  • This assembly can be snapped into the holder using one hand and without the use of any tools. To remove the jaw face, simply unscrew the holder until the retention wire opens up. The jaw face can now be easily removed. While this method allows for simple installation and predictable usage patterns, there are some drawbacks associated with it. Firstly, the retention wire and holder both require special detailed machine to get the correct feel and action. Secondly, the semi-permanent pin represents a small loose part that can get lost.
  • FIG. 6 On higher capacity pneumatic side-action grips, the present assignee has implemented the use of a hook and fixed pin connection method as shown in FIG. 6 .
  • a fixed pin is pressed into the back of a specially machined jaw face and acts as an attachment point for a corresponding spring-loaded hook that resides inside of the grip. Attaching the face to the grip requires that the user insert a tool onto the grip to move the spring-loaded hook far enough to slide the face over it. When the hook retracts back into the body, the face is firmly held on the grip. This eliminates loose parts, but necessitates the use of a tool for installation and removal. This apparatus further requires unique detailed faces and holders.
  • connection apparatus for materials testing which is easy to operate, is robust, and provides repeatable jaw face positioning.
  • This rotating dovetail connection is related to the dovetail joinery connection that allows for a secure sliding connection in carpentry without the use of auxiliary parts. Adapting the tongue and groove of the joint into a rounded edge permits the connection to rotate while still being held securely together. This is particularly useful in jaw face attachment where slight rotation of the jaw faces is desired.
  • the tongue also has a detent machine into the back side to permit a spring loaded ball to hold the jaw face securely and accurately in the holder. The degree of rotation is controlled by the placement of the groove in relation to the back of the jaw face.
  • Another embodiment machines flats and a cross aperture on the jaw face for to allow use in grips that use the pin and aperture connection method.
  • FIG. 1 illustrates typical prior art dovetail connection apparatus.
  • FIG. 2 illustrates typical prior art external pin and aperture connection apparatus.
  • FIG. 3 illustrates typical prior art set screw and groove connection apparatus.
  • FIG. 4 illustrates typical prior internal pin and aperture connection apparatus.
  • FIG. 5 illustrates typical prior art internal pin and retention wire connection apparatus.
  • FIG. 6 illustrates typical hook and fixed pin connection apparatus.
  • FIG. 7 is a side view of the rotating dovetail connection assembly of an embodiment of the present invention.
  • FIG. 8 is an exploded isometric view of the rotating dovetail connection assembly of an embodiment of the present invention.
  • FIG. 9 is a cross-sectional view of a holder of an embodiment of the present invention.
  • FIG. 10 is a plan view of the rotating dovetail gripping mechanism of an embodiment of the present invention.
  • FIG. 7 shows the rotating dovetail connection 10 which includes cylindrical holder device (or holder) 12 , the gripping device 14 (which can be configured as a removable jaw face), and the threaded latching mechanism 16 , configured as a spring-loaded ball plunger.
  • latching mechanism 16 include a press-in plunger without threading.
  • FIGS. 7 and 8 the rotating dovetail connection 10 is compromised of these three parts 12 , 14 , 16 .
  • the direction of rotation is also shown in FIG. 7 .
  • the gripping device 14 includes plate 17 and tongue 18 .
  • Tongue 18 further includes a detent 20 on inner face 22 and a cross aperture 24 passing through tongue 18 parallel to plate 17 .
  • Cross aperture 24 is oriented vertically in FIG. 8 .
  • the detent 20 is engaged by latching mechanism 16 which is configured as a spring loaded ball plunger.
  • the spring loaded ball plunger 16 both accurately locates and secures the gripping device 14 relatively to the cylindrical holder device 12 .
  • the cross aperture 24 in the gripping device 14 serves as a connection point for a traditional pin and aperture connection, allowing for the gripping device 14 to be used on accessories with this connection style.
  • the gripping device 14 also utilizes a sloped surface 26 on an end (or ends) of tongue 18 on to better facilitate insertion of the gripping device 14 into the holding device 12 .
  • the cross-sectional view of the holding device 12 in FIG. 9 illustrates the details needed for the female end of the rotating dovetail connection 10 .
  • a transverse circular bore 30 is formed in the cylindrical holder device 12 .
  • a cross cut 32 is formed to create a space for the gripping device 14 to slide into the cylindrical holder device 12 .
  • a central longitudinal aperture 34 is formed to accept the latching mechanism 16 .
  • Holding device 12 can be engaged by a materials testing accessory, such as a pneumatic, hydraulic or screw-action grip.
  • the profile of the gripping device 14 which exhibits the male end of the rotating dovetail connection 10 , is shown in FIG. 10 .
  • the inner face 22 includes a rounded portion 40 on the end of the tongue 18 with a radius corresponding to that of the bore radius of transverse circular bore 30 of the is similar in radius to the matching bore radius on the cylindrical holder device 12 .
  • Tongue 18 further includes undercut 42 immediately adjacent to plate 17 . Undercut feature 42 serves to secure the gripping device 14 within the cylindrical holder device 12 from moving laterally in the negative Z direction as shown on FIG. 10 . Additionally, the lateral flat portions 44 on the tongue 18 allow the gripping device 14 to be used on prior art pin and aperture equipment.
  • the ball plunger 16 forces the gripping device 14 in the negative Z direction against the transverse circular bore 30 of the holder device 12 .
  • the ball plunger 16 is compressed, the rounded surface 22 mates up with the transverse circular bore 30 , and the connection is free to rotate about the X-axis in FIG. 10 (Y-axis in FIG. 9 ).

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
US12/322,386 2008-03-18 2009-02-02 Rotating dovetail connection for materials testing Abandoned US20090235755A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US12/322,386 US20090235755A1 (en) 2008-03-18 2009-02-02 Rotating dovetail connection for materials testing
DE200910009733 DE102009009733B4 (de) 2008-03-18 2009-02-19 Einspannvorrichtung für die Materialprüfung
CN200910126799.8A CN101551312B (zh) 2008-03-18 2009-03-05 用于材料测试的转动楔型榫头连接
JP2009064685A JP5551375B2 (ja) 2008-03-18 2009-03-17 材料試験用蟻継ぎ接続部
US14/854,246 US9377385B2 (en) 2008-03-18 2015-09-15 Rotating dovetail connection for materials testing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6981508P 2008-03-18 2008-03-18
US12/322,386 US20090235755A1 (en) 2008-03-18 2009-02-02 Rotating dovetail connection for materials testing

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/854,246 Continuation US9377385B2 (en) 2008-03-18 2015-09-15 Rotating dovetail connection for materials testing

Publications (1)

Publication Number Publication Date
US20090235755A1 true US20090235755A1 (en) 2009-09-24

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Application Number Title Priority Date Filing Date
US12/322,386 Abandoned US20090235755A1 (en) 2008-03-18 2009-02-02 Rotating dovetail connection for materials testing
US14/854,246 Active US9377385B2 (en) 2008-03-18 2015-09-15 Rotating dovetail connection for materials testing

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/854,246 Active US9377385B2 (en) 2008-03-18 2015-09-15 Rotating dovetail connection for materials testing

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US (2) US20090235755A1 (enrdf_load_stackoverflow)
JP (1) JP5551375B2 (enrdf_load_stackoverflow)
CN (1) CN101551312B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107192610A (zh) * 2017-06-30 2017-09-22 西南交通大学 拉伸试验机的夹具
US20220234219A1 (en) * 2019-06-28 2022-07-28 Schaeffler Technologies AG & Co. KG Quick-change system
US11440276B2 (en) 2017-03-21 2022-09-13 Textron Innovations Inc. Methods of making a specimen with a predetermined wrinkle defect
US11566984B2 (en) * 2017-03-21 2023-01-31 Textron Innovations, Inc. Methods of making a tubular specimen with a predetermined wrinkle defect

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108956282B (zh) * 2018-07-10 2021-01-12 东南大学 一种用于医用聚合物材料力学性能测试的专用夹具
CN112611635B (zh) * 2020-11-09 2022-03-11 西北工业大学 一种混凝土单轴拉伸试验夹具及试验方法
CN112730228A (zh) * 2020-12-23 2021-04-30 西安鑫垚陶瓷复合材料有限公司 一种涂层结合强度测试用粘接工装及其使用方法
CN115452578B (zh) * 2022-09-21 2023-04-18 高安市华鸿电器有限公司 一种电线加工拉伸检测装置

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US1274685A (en) * 1915-01-06 1918-08-06 Westinghouse Electric & Mfg Co Chuck for machine-tools.
US2523374A (en) * 1949-11-03 1950-09-26 Peerless Machine Company Chuck
US2993701A (en) * 1958-06-02 1961-07-25 Skinner Chuck Company Chuck opening and closing mechanism
US3248121A (en) * 1964-04-21 1966-04-26 Volpe Michael Jaw assembly
US3413010A (en) * 1966-01-20 1968-11-26 Buck Tool Co Mechanical device
US3494627A (en) * 1967-11-15 1970-02-10 Anton E Pirman Jaw chuck
US3583717A (en) * 1969-03-05 1971-06-08 Leblond Mach Tool Co R K Chuck construction
US3679221A (en) * 1970-06-11 1972-07-25 Alvin J Behrens Chuck jaw insert and assembly
US3833232A (en) * 1970-06-11 1974-09-03 Cleveland Twist Drill Co Chuck jaw insert assembly
US4353561A (en) * 1980-08-26 1982-10-12 The United States Of America As Represented By The Unites States Department Of Energy Self-aligning lathe chuck jaws
US6237422B1 (en) * 1997-12-13 2001-05-29 Dage Precision Industries Ltd. Apparatus and method for testing strength of electrical bond sites on semiconductor devices
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11440276B2 (en) 2017-03-21 2022-09-13 Textron Innovations Inc. Methods of making a specimen with a predetermined wrinkle defect
US11566984B2 (en) * 2017-03-21 2023-01-31 Textron Innovations, Inc. Methods of making a tubular specimen with a predetermined wrinkle defect
CN107192610A (zh) * 2017-06-30 2017-09-22 西南交通大学 拉伸试验机的夹具
US20220234219A1 (en) * 2019-06-28 2022-07-28 Schaeffler Technologies AG & Co. KG Quick-change system
US11858124B2 (en) * 2019-06-28 2024-01-02 Schaeffler Technologies AG & Co. KG Quick-change system for gripper jaws

Also Published As

Publication number Publication date
JP5551375B2 (ja) 2014-07-16
US9377385B2 (en) 2016-06-28
US20160069784A1 (en) 2016-03-10
CN101551312A (zh) 2009-10-07
JP2009222717A (ja) 2009-10-01
CN101551312B (zh) 2014-04-09

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AS Assignment

Owner name: ILLINOIS TOOL WORKS INC., ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SMALLWOOD, JAMES BRITTAIN;REEL/FRAME:022257/0502

Effective date: 20090130

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION