US3922784A - Swivel knife for manual operation with blade holder offset skewably from handle - Google Patents

Swivel knife for manual operation with blade holder offset skewably from handle Download PDF

Info

Publication number
US3922784A
US3922784A US554678A US55467875A US3922784A US 3922784 A US3922784 A US 3922784A US 554678 A US554678 A US 554678A US 55467875 A US55467875 A US 55467875A US 3922784 A US3922784 A US 3922784A
Authority
US
United States
Prior art keywords
holder
handle
rod
blade
bushing
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
Application number
US554678A
Other languages
English (en)
Inventor
Michael J Prince
Donald Marsden
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.)
Diagravure Film Manufacturing Corp
Original Assignee
Diagravure Film Manufacturing Corp
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 Diagravure Film Manufacturing Corp filed Critical Diagravure Film Manufacturing Corp
Priority to US554678A priority Critical patent/US3922784A/en
Priority to DE19752547903 priority patent/DE2547903A1/de
Priority to JP50134192A priority patent/JPS51101300A/ja
Application granted granted Critical
Publication of US3922784A publication Critical patent/US3922784A/en
Priority to FR7538688A priority patent/FR2302819A1/fr
Priority to GB8323/76A priority patent/GB1487710A/en
Priority to CH266876A priority patent/CH595959A5/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B5/00—Hand knives with one or more detachable blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B11/00—Artists' hand tools for sculpturing, kneading, carving, engraving, guilloching or embossing; Accessories therefor
    • B44B11/02—Artists' hand tools for sculpturing, kneading, carving, engraving, guilloching or embossing; Accessories therefor for substantially two-dimensional carving, engraving or guilloching

Definitions

  • This invention relates to a cutting instrument and more particularly to an instrument usable in graphic arts for manually cutting around designs and parts of pictoral illustrations with the object of removing such parts from their surroundings.
  • One field of use is in making separation plates, but of course the instrument has many other uses in graphic arts and elsewhere.
  • the material cut away may be acetate sheets or other plastic sheets or it may be paper or bristol board or the like.
  • the instrument can also be used to cut one layer of a laminate without cutting a next layer thereof. In any event such parts, designs or the like to be cut out and removedfrom their surroundingmaterial may be either of substantially straight lines (or partly so) or of curved lines of small or large radii of curvature (or partly so).
  • a prime object of this'invention is to provide a cutting instrument of the character described which can be adjusted conveniently in the angle of incidence of the blade to the work.
  • a still further object of this invention is to provide a cutting instrument of the character described which minimizes likelihood of shadows appearing on the work.
  • a still further object of this invention is to provide a cutting instrument of the character described which is less fatiguing to its user than prior cutting instruments of like kind.
  • a still further object of this invention is to provide a cutting instrument of the characterdescribed which can be operated by use of one hand of the user while the other hand adjusts the rotation of the blade.
  • a still further object of this invention is to provide an improved cutting instrument of the character described which is adaptable for either rectilinear cutting (by which is meant substantially straight lines) or for curvilinear cutting (by which is meant curved lines of varied radii of curvature). Rectilinear cutting is done best by a blade which is fixed relative its holder, while curvilinear cutting is facilitated by permitting the blade to rotate freely with respect to its holder. In the cutting instrument of this invention means are provided for permitting the blade to rotate freely relative to its holder.
  • FIG. 1 is a front view of a complete cutting instrument according to my invention.
  • FIG. 2 is a right side view of the cutting instrument of FIG. 1.
  • FIG. 3 is a left side view of the cutting instrument of FIG. 1.
  • FIG. 4 is a broken top view to an enlarged scale showing mounting of a blade holder skewed relative a handle.
  • FIG. 5 is a broken bottom view to an enlarged scale showing the mounting of the blade holder skewed relative the handle.
  • FIG. 6 is a front view of the complete cutting instrument as FIG. 1 but to an enlarged scale.
  • FIG. 7 is a partly broken left side view of the cutting instrument to an enlarged scale with the'blade holder in full lines in its vertical position and in dotted lines ro-,
  • FIG. 8 is a broken exploded view showing parts of the blade holder spaced relative each other.
  • FIG. 9 is a partly broken sectional view through the blade holder.
  • FIG. 10 is a sectional view taken along line 10I0 of FIG. 9.
  • the cutting instrument includes a handle 11 and a blade holder 12 joined for rotatable movement about a lateral axis 13 (seen best in FIG. 7).
  • the handle has to receive a screw 23 along the lateral axis 13, whereby the handle 18 and the holder 19 projection can be rotated relative each other about the lateral axis 13 to vary the skewable orientation of the holder 12 relative the handle 11.
  • the screw 23 has an enlarged end 24 and it threadably engages a nut 25 which is used to set the holder 12 in a desired skewable orientation relative to the handle 11.
  • the holder 12 may be arranged vertically as shown in full lines in FIG. 7 or at some other convenient skewable inclination as shown in dotted lines in FIG. 7.
  • the collar 21 is provided with a threaded hole 26 through which a set screw 27 clamps a barrel 28 of the holder 12.
  • the barrel 28 is provided as best seen in FIG. 8 with an apertured disc 29 near its blade end (lowermost in FIG. 7) and a similar apertured disc 31 at the other end (uppermost in FIG. 7) both discs 29, 31 being held securely in place.
  • a long slender rod 32 is disposed axially within the barrel 28 and rotatably held in the apertured discs 29, 3 l.
  • the upper end 33 of the rod 32 is threaded for an adjusting thimble 34, having external serrations 35 to enable it to be turned by the fingers.
  • the rod 32 Near its lower end 36 the rod 32 has a cylindrical enlargement 37, which abuts the lower apertured disc 29. The rod 32 is thus held in place at its lower end 36 by the cylindrical enlargement 37 and by the thimble 34 at its upper end 33.
  • the lowermost portion of the rod 32 i.e. downward from the cylindrical enlargement 37, is slit as indicated at 38.
  • the portion next to the cylindrical enlargement 39 is threaded while the end is slightly tapered at 41.
  • a small bushing 42 is slipped on this lower end 36 of the rod 32 and is threaded internally at 43 to screw on the aforesaid thread 39 of the lower end 36 of the rod 32.
  • the internal diameter of the bushing 42 is slightly reduced at its tip end as indicated at 44.
  • the bushing 42 and the slitted lower end 36 of the rod 32 function as a collet to secure a small interchangeable blade-45 by gripping its reduced shank 46.
  • the other surface of the bushing 42 is provided with longitudinal flattened surfaces 47 which serve a dual purpose.
  • the flattened surfaces 47 enable fingers to turn the rather small bushing 42 in making adjustments and in changing the blade.
  • the flattened surfaces 47 of the bushing 42 also cooperate with a small cap 48 which is placed over the bushing 42 to cover and protect the blade 45 when not in use.
  • the cap 48 is provided internally with a surface 49 which engages the flattened surfaces 47 of the bushing 42.
  • the thimble 34 serves to retain the inner rod 32 in place within the hollow barrel 28 and also functions to permit the blade 45 to rotate freely with respect to the barrel 28.
  • the blade 45 is removed or inserted by manipulation of the bushing 42. During this manipulation it is undesirable that the inner rod 32 be free to rotate. For this reason a small hole 51 is provided diametrically through the cylindrical enlargement 37 of the lower end 36 of inner rod 32.
  • the barrel 28 also has diametrically opposed apertures 52. With the hole 51 and the holder apertures 52 being alignable. A pin 53 may be passed therethrough as best seen in FIGS. 9 and to hold the inner rod 32 against rotation. The pin 53 also is inserted when it is desired to use the cutting instrument with the blade 45 in a fixed position.
  • the bushing 42 may then be loosened so that the blade 45 can be removed, or the bushing 42 may be tightened to secure the shank 46 of the blade 45 in the collet slit 38.
  • the cap 48 may be used for this purpose.
  • the cap 48 is fitted in place. The internal surface 49 of the cap 48 engages the flattened surfaces 47 of the bushing 42 so that turning of the cap 48 will turn the bushing 42 relative the inner rod 32 which is fixed by means of the pin 53 to the barrel 28.
  • a cutting instrument for manual operation comprising: 3
  • an elongated handle having a handle axis and a front end
  • a blade holder mounted skewably on the front end of the handle about a lateral axis that is normal to the handle axis
  • the holder being elongated and hollow and having a holder axis
  • a thimble connected to the upper end of the rod with the thimble serving to retain the rod in the holder
  • the handle provided at its front end with at least one handle projection having a handle hole therein,
  • the holder provided with at least one holder projection having a holder hole therein,
  • the screw having an enlarged first end and a threaded second end.
  • a nut engageable on the second end to fix the holder relative the handle.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
  • Surgical Instruments (AREA)
  • Removal Of Insulation Or Armoring From Wires Or Cables (AREA)
US554678A 1975-03-03 1975-03-03 Swivel knife for manual operation with blade holder offset skewably from handle Expired - Lifetime US3922784A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US554678A US3922784A (en) 1975-03-03 1975-03-03 Swivel knife for manual operation with blade holder offset skewably from handle
DE19752547903 DE2547903A1 (de) 1975-03-03 1975-10-25 Handschneidgeraet
JP50134192A JPS51101300A (forum.php) 1975-03-03 1975-11-10
FR7538688A FR2302819A1 (fr) 1975-03-03 1975-12-17 Instrument de decoupage pivotant pour utilisation manuelle, a porte-lame decale suivant un angle par rapport au manche
GB8323/76A GB1487710A (en) 1975-03-03 1976-03-02 Cutting instruments
CH266876A CH595959A5 (forum.php) 1975-03-03 1976-03-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US554678A US3922784A (en) 1975-03-03 1975-03-03 Swivel knife for manual operation with blade holder offset skewably from handle

Publications (1)

Publication Number Publication Date
US3922784A true US3922784A (en) 1975-12-02

Family

ID=24214274

Family Applications (1)

Application Number Title Priority Date Filing Date
US554678A Expired - Lifetime US3922784A (en) 1975-03-03 1975-03-03 Swivel knife for manual operation with blade holder offset skewably from handle

Country Status (6)

Country Link
US (1) US3922784A (forum.php)
JP (1) JPS51101300A (forum.php)
CH (1) CH595959A5 (forum.php)
DE (1) DE2547903A1 (forum.php)
FR (1) FR2302819A1 (forum.php)
GB (1) GB1487710A (forum.php)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977077A (en) * 1975-09-02 1976-08-31 Cbs Inc. Convertible swivel knife
US3994066A (en) * 1975-08-28 1976-11-30 Lawrence Peska Associates, Inc. Knife for craftsmen
USD274121S (en) 1982-06-21 1984-06-05 Artmob, Inc. Tool for cutting stained glass patterns
US4534348A (en) * 1982-01-12 1985-08-13 Moskovsky Nauchno-Issledovatelsky Institut Mirrokhirurgii Glaza Instrument for making corneal incisions
US4672964A (en) * 1986-02-21 1987-06-16 Dee Robert N Scalpel with universally adjustable blade
US4788976A (en) * 1986-02-21 1988-12-06 Dee Robert N Universally adjustable blade
US4799315A (en) * 1987-06-08 1989-01-24 Ziegler Steven M Knife support and cutting guide
US4885004A (en) * 1986-01-24 1989-12-05 Pao David S C Rotating stylus cystitome
US5400510A (en) * 1993-12-20 1995-03-28 Glodowski; Michael J. Windshield glass knife brace
US5431671A (en) * 1993-05-28 1995-07-11 Nallakrishnan; Ravi Surgical knife with retractable and angularly adjustable blade
US5867912A (en) * 1995-09-14 1999-02-09 San Diego Swiss Machining, Inc. Adjustable surgical handle
US20020062567A1 (en) * 2000-11-29 2002-05-30 Travis Nichols Cutting device
US6422780B2 (en) * 1999-06-25 2002-07-23 Pao-Lu Chen Structure for connecting a tool with a grip
US20020120285A1 (en) * 2001-02-23 2002-08-29 Ras Holding Corp Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US6619172B2 (en) * 1999-05-25 2003-09-16 Mimix Template tracing cutter
US20090254071A1 (en) * 2008-04-02 2009-10-08 Refocus Group, Inc. System and method for identifying a position to insert a scleral prosthesis into an eye
US20100175524A1 (en) * 2009-01-12 2010-07-15 Crayola, Llc Non linear cutting apparatus and method for its use
US7909780B2 (en) 2002-02-22 2011-03-22 Refocus Ocular, Inc. System and method for determining a position for a scleral pocket for a scleral prosthesis
US8597318B2 (en) 2011-08-08 2013-12-03 Refocus Group, Inc. Apparatus and method for forming incisions in ocular tissue
GB2529260A (en) * 2014-08-16 2016-02-17 Stuart Etchels Multi-etch handle
CN107856460A (zh) * 2017-10-26 2018-03-30 张娜 一种组合型刻刀
US20190201163A1 (en) * 2018-01-03 2019-07-04 Charles Buist, DMD, PA Surgical Dental Tool
US20190224862A1 (en) * 2018-01-25 2019-07-25 Ningbo Yinzhou Yongjia Electrical Tools Co., Ltd. Carving knife
US10806631B2 (en) 2017-08-23 2020-10-20 Refocus Group, Inc. Surgical tool for forming incisions in ocular tissue with tip providing visibility and related apparatus and method
US11191622B2 (en) 2018-01-03 2021-12-07 Charles Buist, DMD, PA Method and apparatus for surgically placing a dental implant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60123173U (ja) * 1984-01-28 1985-08-20 株式会社　きもと カツタ−
JPS60185560U (ja) * 1984-05-21 1985-12-09 株式会社　コンサイス カツタ−アタツチメント
GB2289642B (en) * 1994-05-18 1997-06-18 Edward Henry Harvey Hand-held instrument for cutting paper or similar planar sheet material

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US207866A (en) * 1878-09-10 Improvement in tools for cutting out patterns
US1775813A (en) * 1928-10-29 1930-09-16 Vincent V Colby Curve cutter
US2569286A (en) * 1949-03-01 1951-09-25 Bunker Joseph Farrin Swivel knife
US2639505A (en) * 1952-03-04 1953-05-26 Ralph E Reynolds Knife for carving leather and the like
US2659143A (en) * 1951-05-19 1953-11-17 Harvey L Baker Stencil cutting knife
US2803877A (en) * 1954-06-01 1957-08-27 Joseph L Belanger Swivel knife
US3080653A (en) * 1962-04-20 1963-03-12 Herbert S Dolin Cutting tool
US3831276A (en) * 1973-07-31 1974-08-27 W Dalton Convertible swivel knife which illuminates work area

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR454152A (fr) * 1913-02-10 1913-06-27 Pierre Philippe Hure Perfectionnements aux trusquins
DE1236211B (de) * 1962-07-26 1967-03-09 Heinz H Lorenz K G Verbindungsstueck zum auswechselbaren Anbringen eines Tusche- oder Tintenschreib-organs an einem Zirkel oder Halter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US207866A (en) * 1878-09-10 Improvement in tools for cutting out patterns
US1775813A (en) * 1928-10-29 1930-09-16 Vincent V Colby Curve cutter
US2569286A (en) * 1949-03-01 1951-09-25 Bunker Joseph Farrin Swivel knife
US2659143A (en) * 1951-05-19 1953-11-17 Harvey L Baker Stencil cutting knife
US2639505A (en) * 1952-03-04 1953-05-26 Ralph E Reynolds Knife for carving leather and the like
US2803877A (en) * 1954-06-01 1957-08-27 Joseph L Belanger Swivel knife
US3080653A (en) * 1962-04-20 1963-03-12 Herbert S Dolin Cutting tool
US3831276A (en) * 1973-07-31 1974-08-27 W Dalton Convertible swivel knife which illuminates work area

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994066A (en) * 1975-08-28 1976-11-30 Lawrence Peska Associates, Inc. Knife for craftsmen
US3977077A (en) * 1975-09-02 1976-08-31 Cbs Inc. Convertible swivel knife
US4534348A (en) * 1982-01-12 1985-08-13 Moskovsky Nauchno-Issledovatelsky Institut Mirrokhirurgii Glaza Instrument for making corneal incisions
USD274121S (en) 1982-06-21 1984-06-05 Artmob, Inc. Tool for cutting stained glass patterns
US4885004A (en) * 1986-01-24 1989-12-05 Pao David S C Rotating stylus cystitome
US4672964A (en) * 1986-02-21 1987-06-16 Dee Robert N Scalpel with universally adjustable blade
US4788976A (en) * 1986-02-21 1988-12-06 Dee Robert N Universally adjustable blade
US4799315A (en) * 1987-06-08 1989-01-24 Ziegler Steven M Knife support and cutting guide
US5431671A (en) * 1993-05-28 1995-07-11 Nallakrishnan; Ravi Surgical knife with retractable and angularly adjustable blade
US5400510A (en) * 1993-12-20 1995-03-28 Glodowski; Michael J. Windshield glass knife brace
US5867912A (en) * 1995-09-14 1999-02-09 San Diego Swiss Machining, Inc. Adjustable surgical handle
US6619172B2 (en) * 1999-05-25 2003-09-16 Mimix Template tracing cutter
US6422780B2 (en) * 1999-06-25 2002-07-23 Pao-Lu Chen Structure for connecting a tool with a grip
US20020062567A1 (en) * 2000-11-29 2002-05-30 Travis Nichols Cutting device
US20070123919A1 (en) * 2001-02-23 2007-05-31 Ras Holding Corp System and method for making incisions for scleral eye implants
US7854742B2 (en) 2001-02-23 2010-12-21 Refocus Ocular, Inc. System and method for making incisions for scleral eye implants
US20060036269A1 (en) * 2001-02-23 2006-02-16 Ras Holding Corp Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US20060106409A1 (en) * 2001-02-23 2006-05-18 Ras Holding Corp System and method for making incisions for scleral eye implants
US20060106408A1 (en) * 2001-02-23 2006-05-18 Ras Holding Corp Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US20070078471A1 (en) * 2001-02-23 2007-04-05 Ras Holding Corp System and method for making incisions for scleral eye implants
US20020120285A1 (en) * 2001-02-23 2002-08-29 Ras Holding Corp Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US8361098B2 (en) 2001-02-23 2013-01-29 Refocus Ocular, Inc. Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US8623037B2 (en) 2001-02-23 2014-01-07 Refocus Ocular, Inc. System and method for making incisions for scleral eye implants
US7824423B2 (en) 2001-02-23 2010-11-02 Refocus Ocular, Inc. System and method for making incisions for scleral eye implants
US8500767B2 (en) 2001-02-23 2013-08-06 Refocus Ocular, Inc. Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US6926727B2 (en) * 2001-02-23 2005-08-09 Refocus Ocular, Inc. Surgical blade for use with a surgical tool for making incisions for scleral eye implants
US7909780B2 (en) 2002-02-22 2011-03-22 Refocus Ocular, Inc. System and method for determining a position for a scleral pocket for a scleral prosthesis
US8201942B2 (en) 2008-04-02 2012-06-19 Refocus Group, Inc. System and method for identifying a position to insert a scleral prosthesis into an eye
US20090254071A1 (en) * 2008-04-02 2009-10-08 Refocus Group, Inc. System and method for identifying a position to insert a scleral prosthesis into an eye
US8210075B2 (en) * 2009-01-12 2012-07-03 Crayola Llc Non linear cutting apparatus and method for its use
US20100175524A1 (en) * 2009-01-12 2010-07-15 Crayola, Llc Non linear cutting apparatus and method for its use
US8597318B2 (en) 2011-08-08 2013-12-03 Refocus Group, Inc. Apparatus and method for forming incisions in ocular tissue
US8945166B2 (en) 2011-08-08 2015-02-03 Refocus Group, Inc. Apparatus and method for forming incisions in ocular tissue
GB2529260A (en) * 2014-08-16 2016-02-17 Stuart Etchels Multi-etch handle
GB2532543A (en) * 2014-08-16 2016-05-25 Etchels Stuart A craft tool
GB2532543B (en) * 2014-08-16 2019-04-10 Etchels Stuart A craft tool
US10806631B2 (en) 2017-08-23 2020-10-20 Refocus Group, Inc. Surgical tool for forming incisions in ocular tissue with tip providing visibility and related apparatus and method
CN107856460A (zh) * 2017-10-26 2018-03-30 张娜 一种组合型刻刀
US20190201163A1 (en) * 2018-01-03 2019-07-04 Charles Buist, DMD, PA Surgical Dental Tool
US10758319B2 (en) * 2018-01-03 2020-09-01 Charles Buist, DMD, PA Surgical dental tool
US11191622B2 (en) 2018-01-03 2021-12-07 Charles Buist, DMD, PA Method and apparatus for surgically placing a dental implant
US20190224862A1 (en) * 2018-01-25 2019-07-25 Ningbo Yinzhou Yongjia Electrical Tools Co., Ltd. Carving knife

Also Published As

Publication number Publication date
CH595959A5 (forum.php) 1978-02-28
JPS51101300A (forum.php) 1976-09-07
DE2547903A1 (de) 1976-09-16
GB1487710A (en) 1977-10-05
FR2302819A1 (fr) 1976-10-01

Similar Documents

Publication Publication Date Title
US3922784A (en) Swivel knife for manual operation with blade holder offset skewably from handle
US2569286A (en) Swivel knife
US5431671A (en) Surgical knife with retractable and angularly adjustable blade
US5490331A (en) Utility knife for cutting and scraping
US5547419A (en) Knives and scissors sharpener
US5157996A (en) Tool
US9079327B2 (en) Woodworking hand tool
US3091031A (en) Cable slitting tool
US6484405B1 (en) Rotary wheel cutting apparatus with a spring-biased blade cover
US4126165A (en) Wood lathe chisel
US3098327A (en) Grinding and polishing machine for precious or semi-precious stones
US5048184A (en) Slot blade holder
US2346084A (en) Tool
US2805475A (en) Fine line engraving tool for map making
US4620370A (en) Cue tip trimmer
US1275225A (en) Sheath-removing tool.
GB2293346A (en) Auxiliary rule of tile cutter
US4378718A (en) Handle for pivotable machine parts
US20200282543A1 (en) Socket Drive Assembly
US2389069A (en) Hypodermic needle grinder
US1905482A (en) Saw adapter
US2493128A (en) Photograph negative etching tool
US3022609A (en) Drill sharpener and point thinner
US3744069A (en) Washer shaping tool
US2458188A (en) Drafting instrument