US3767183A - Clamp having miter jaws - Google Patents

Clamp having miter jaws Download PDF

Info

Publication number
US3767183A
US3767183A US00189922A US3767183DA US3767183A US 3767183 A US3767183 A US 3767183A US 00189922 A US00189922 A US 00189922A US 3767183D A US3767183D A US 3767183DA US 3767183 A US3767183 A US 3767183A
Authority
US
United States
Prior art keywords
bar
clamp
removable
hold
attachment
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
US00189922A
Inventor
Gelder H Van
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.)
Universal Clamp Corp
Original Assignee
Universal Clamp 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 Universal Clamp Corp filed Critical Universal Clamp Corp
Application granted granted Critical
Publication of US3767183A publication Critical patent/US3767183A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • B23Q3/066Bench vices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/02Vices with sliding jaws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/24Details, e.g. jaws of special shape, slideways
    • B25B1/2405Construction of the jaws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00Clamps
    • B25B5/14Clamps for work of special profile
    • B25B5/142Clamps for work of special profile for windows and frames

Definitions

  • ABSTRACT [51] Int. Cl. B23q 3/02, B25b 1/02, 825': 1/24 Field of Search 269/99, 41, 4, 95, 269 /21 1, 261, 268, 269, 207, 283
  • My device provides a dual purpose clamp able to hold mitered joints of material up to about four inches thick, or usable as a bar clamp having relatively short opening.
  • a novel clamping arrangement to hold the device to a table or bench it readily becomes usable as a vise to hold workpieces.
  • the clamp while holding a mitered joint leaves the upper surface of the pieces completely open. This makes it possible to apply holders, fasteners or other material to the joined pieces. This could be used to attach strengthening braces to the joint by placing the workpiece face down in the clamp. Similar uses will undoubtedly occur to those skilled in the art upon a study of the specification and drawings.
  • the use of the device as a vise is made possible through a novel holding arrangement providing for quick connection between the clamp and a device on a workbench.
  • a corner could be held in the clamp, then the clamp be attached to the workbench to hold the assembly in place while other work was being done on the workpiece.
  • FIG. 1 is a top plan view of my clamp as used to hold -mitered joints
  • my invention comprises a clamp means similar to that described in my aforesaid patent, but improved by the use of two removable attachments.
  • the attachments are formed to clamp mitered corners and are readily removable to allow the clamp to be used for clamping other types of joints.
  • I also provide a holding means adapted to hold the clamp to a workbench.
  • my invention includes the basic members of the previously patented device including the longitudinal bar member 10.
  • the bar is formed of T-shaped cross sectional member avoiding the need for an enlarged end.
  • the surface 11 of the bar is the equivalent of and is adequate for the purpose served by that enlarged end illustrated in the prior patent.
  • the head piece 12 embracing the screw threaded member 13 to control the pad 14 may be similar to the previous device.
  • the removable U-shaped yoke member 15 is also similar to that of my former clamp.
  • the novel part of my present device includes a removable and reversible abutment attachment 18 best shown in FIG. 4.
  • This attachment is also formed of a generally T-shaped bar 16 including flat cross members adapted to slide along the upper surface 11 of the main bar of the clamp.
  • the web of the T-shaped member is formed to provide notches 17. These notches are engaged by the removable U-shaped yoke member 15 to hold the attachment in longitudinal position on the clamp.
  • One end of the bar 16 is formed with a flat abutment 20. Using this end with the flat pad 14 would allow the clamp to be used as an ordinary bar clamp.
  • the other end of the bar 16 is used with a second attachment 22 shown best in FIG. 3.
  • This attachment is formed with a channelled socket 23 adapted to fit over the pad 14 as shown in FIG. 1.
  • a pair of walls 24 extend in a V-shape from an apex next to the socket 23. These walls preferably form a angle to hold a mitered joint. Ifjoints were to be made at some other angle than a right angle a different attachment could be used, but this would seem to be a rare occurrence and would require special handling.
  • a web 25 is provided for added strength in supporting the walls 24 and to support the workpieces being glued.
  • the bar 16 has a pointed end 27 opposite to the abutment 20 formed to match the angle of the walls 24. This end is directed toward the pad 14 when it is desired to clamp a mitered joint.
  • the attachment 22 is used on the pad 14, and the workpieces may then be held in proper relationship between the walls 24 and the end 27, and at right angles to each other.
  • My device is also designed to be used as a vise. This is accomplished through the use of a plate 30 adapted to be affixed to a workbench or the like. A tapered slot 31 including overhanging flanges is formed in the plate 30. An attaching flange 32 is fastened to the upright portion of the bar 10 on the clamp. This flange is tapered to the same shape as the slot 31 so that it can be inserted into the slot, slid toward the narrow end and thus clamped in place.
  • the clamp can be mounted on a bench for use as a clamp for holding workpieces to be clamped or as a bench vise to hold a single piece to be worked on.
  • Clamp means comprising a main bar, head means near one end of said bar, adjustable means movably mounted in said head means, pad means carried by said adjustable means and movable longitudinally of said bar, U-shaped yoke means having substantially parallel legs, the first of said legs being pivotally journalled near the end of said bar opposite said head means, abutment means having a surface matching that of said bar whereby it is slidable both longitudinally and laterally on said bar, the second of said legs extending over said is removably mounted on said pad means, said attachment means formed to provide a right angle socket, said removable means having a second end formed to provide a matching point whereby a mitered joint may be held between said socket and said point.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

A clamp having as an improvement, removable devices adapted to hold mitered joints. The clamp may be removably fixed to a bench by novel holding means.

Description

United States Patent 1 1 Van Gelder Oct. 23, 1973 [54] CLAMP HAVING MITER JAWS 1,393,083 10 1921 Campbell 269 99 x 1,498,638 6/1924 Periolat 269/269 x [75 1 Inventor- Van Geld", Van Nuys, 1,783,713 12/1930 Holman 269/207 x callf- 1,914,291 6/1933 Reid 269/207 x [73] Assignee: Universal Clamp Corporation, 2,894,548 7/1959 Peck et al... 269/268 X Van Nllys, Calif. 3,425,098 2/l969 Bredvik 269/228 X 7 [22] Filed Oct l9 1 Primary Examiner-James L. Jones, Jr. [211 App]. No.: 189,922 Assistant ExaminerJoseph T. Zatarga Attorney-Lucas J. De Koster [52] US. Cl 269/99, 269/207, 269/211,
269/269, 269/283 [57] ABSTRACT [51] Int. Cl. B23q 3/02, B25b 1/02, 825': 1/24 Field of Search 269/99, 41, 4, 95, 269 /21 1, 261, 268, 269, 207, 283
[56] References Cited UNITED STATES PATENTS 708,038 9/1902 Harper 269 99 1,189,397 7 1916 Simon 2 9/211 x A clamp having as an improvement, removable devices adapted to hold mitered joints. The clamp may be removably fixed to a bench by novel holding means.
4 Claims, 6 Drawing Figures Patented :t. 23, 1973 v 3,767,183
2 Sheets-Sheet l INVENTOR. Harold Von 6mm His MW.
Patented Oct. 23, 1973 3,767,183
INVENTOR. Harold Von 6mm His MW.
CLAMP HAVING MITER JAWS BACKGROUND AND SUMMARY OF THE INVENTION In U.S. Pat. No. 3,603,580, I have'disclosed a novel clamp usable for holding two pieces of material particularly wood pieces together for glueing. That clamp was designed especially for holding corners where one piece overlapped the end of the other.
It has now been discovered that modifications were necessary to hold corners where the two pieces were mitered so that the glue was applied to two matching surfaces at an angle to the main edge of each of the pieces. By my invention, I provide a clamp similar to my previously patented clamp, but having attachments whereby both typesof corner joints can be held. The attachment also provides means for operating the clamp as an ordinary clamp.
Previously, even with my clamp, it was difficult to hold a mitered corner joint. My device provides a dual purpose clamp able to hold mitered joints of material up to about four inches thick, or usable as a bar clamp having relatively short opening. In addition, by use of a novel clamping arrangement to hold the device to a table or bench it readily becomes usable as a vise to hold workpieces.
It should further be pointed out that the clamp, while holding a mitered joint leaves the upper surface of the pieces completely open. This makes it possible to apply holders, fasteners or other material to the joined pieces. This could be used to attach strengthening braces to the joint by placing the workpiece face down in the clamp. Similar uses will undoubtedly occur to those skilled in the art upon a study of the specification and drawings.
The use of the device as a vise is made possible through a novel holding arrangement providing for quick connection between the clamp and a device on a workbench. Thus, a corner could be held in the clamp, then the clamp be attached to the workbench to hold the assembly in place while other work was being done on the workpiece.
FIGURES A FIG. 1 is a top plan view of my clamp as used to hold -mitered joints,
DESCRIPTION Briefly, my invention comprises a clamp means similar to that described in my aforesaid patent, but improved by the use of two removable attachments. The attachments are formed to clamp mitered corners and are readily removable to allow the clamp to be used for clamping other types of joints. I also provide a holding means adapted to hold the clamp to a workbench.
More specifically, my invention includes the basic members of the previously patented device including the longitudinal bar member 10. In this improved clamp, the bar is formed of T-shaped cross sectional member avoiding the need for an enlarged end. The
surface 11 of the bar is the equivalent of and is adequate for the purpose served by that enlarged end illustrated in the prior patent. The head piece 12 embracing the screw threaded member 13 to control the pad 14 may be similar to the previous device. The removable U-shaped yoke member 15 is also similar to that of my former clamp.
The novel part of my present device includes a removable and reversible abutment attachment 18 best shown in FIG. 4. This attachment is also formed of a generally T-shaped bar 16 including flat cross members adapted to slide along the upper surface 11 of the main bar of the clamp. The web of the T-shaped member is formed to provide notches 17. These notches are engaged by the removable U-shaped yoke member 15 to hold the attachment in longitudinal position on the clamp.
One end of the bar 16 is formed with a flat abutment 20. Using this end with the flat pad 14 would allow the clamp to be used as an ordinary bar clamp.
The other end of the bar 16 is used with a second attachment 22 shown best in FIG. 3. This attachment is formed with a channelled socket 23 adapted to fit over the pad 14 as shown in FIG. 1. A pair of walls 24 extend in a V-shape from an apex next to the socket 23. These walls preferably form a angle to hold a mitered joint. Ifjoints were to be made at some other angle than a right angle a different attachment could be used, but this would seem to be a rare occurrence and would require special handling. A web 25 is provided for added strength in supporting the walls 24 and to support the workpieces being glued.
The bar 16 has a pointed end 27 opposite to the abutment 20 formed to match the angle of the walls 24. This end is directed toward the pad 14 when it is desired to clamp a mitered joint. For this purpose, the attachment 22 is used on the pad 14, and the workpieces may then be held in proper relationship between the walls 24 and the end 27, and at right angles to each other.
My device is also designed to be used as a vise. This is accomplished through the use of a plate 30 adapted to be affixed to a workbench or the like. A tapered slot 31 including overhanging flanges is formed in the plate 30. An attaching flange 32 is fastened to the upright portion of the bar 10 on the clamp. This flange is tapered to the same shape as the slot 31 so that it can be inserted into the slot, slid toward the narrow end and thus clamped in place. Thus, the clamp can be mounted on a bench for use as a clamp for holding workpieces to be clamped or as a bench vise to hold a single piece to be worked on.
I claim:
1. Clamp means comprising a main bar, head means near one end of said bar, adjustable means movably mounted in said head means, pad means carried by said adjustable means and movable longitudinally of said bar, U-shaped yoke means having substantially parallel legs, the first of said legs being pivotally journalled near the end of said bar opposite said head means, abutment means having a surface matching that of said bar whereby it is slidable both longitudinally and laterally on said bar, the second of said legs extending over said is removably mounted on said pad means, said attachment means formed to provide a right angle socket, said removable means having a second end formed to provide a matching point whereby a mitered joint may be held between said socket and said point.
4. The device of claim I in which said removable means is formed with notches engaged by said yoke member to hold said removable means firmly in place.

Claims (4)

1. Clamp means comprising a main bar, head means near one end of said bar, adjustable means movably mounted in said head means, pad means carried by said adjustable means and movable longitudinally of said bar, U-shaped yoke means having substantially parallel legs, the first of said legs being pivotally journalled near the end of said bar opposite said head means, abutment means having a surface matching that of said bar whereby it is slidable both longitudinally and laterally on said bar, the second of said legs extending over said abutment means to hold it in slidable engagement with said bar, said abutment means being thereby readily removable from said bar by sliding laterally of said bar and away from said yoke means.
2. The device of claim 1 in which disengagable attachment means are fastened to said bar and are adapted to be attached to a workbench whereby said main bar may be readily attached and disengaged from said workbench.
3. The device of claim 1 in which attachment means is removably mounted on said pad means, said attachment means formed to provide a right angle socket, said removable means having a second end formed to provide a matching point whereby a mitered joint may be held between said socket and said point.
4. The device of claim 1 in which said removable means is formed with notches engageD by said yoke member to hold said removable means firmly in place.
US00189922A 1971-10-18 1971-10-18 Clamp having miter jaws Expired - Lifetime US3767183A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18992271A 1971-10-18 1971-10-18

Publications (1)

Publication Number Publication Date
US3767183A true US3767183A (en) 1973-10-23

Family

ID=22699322

Family Applications (1)

Application Number Title Priority Date Filing Date
US00189922A Expired - Lifetime US3767183A (en) 1971-10-18 1971-10-18 Clamp having miter jaws

Country Status (1)

Country Link
US (1) US3767183A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191367A (en) * 1977-11-16 1980-03-04 Sheterom Samuel G Jr Fluid-operated vise with jaw mounting system
EP0017949A1 (en) * 1979-04-18 1980-10-29 Häfele KG Device for clamping two sheets and for drilling holes in these sheets
US4363475A (en) * 1980-09-08 1982-12-14 Mccarty Robert W Vise-like C-clamp for gripping variously shaped work pieces in varying positions
US4431174A (en) * 1981-12-11 1984-02-14 Arnold Varden Vice
FR2541172A1 (en) * 1983-02-17 1984-08-24 Claude Guiu Appliance for cutting a bevel in a component
EP0119890A1 (en) * 1983-02-17 1984-09-26 Claude Guiu Apparatus for making a bevelled cut in a workpiece
US4608900A (en) * 1984-01-06 1986-09-02 Claude Guiu Apparatus for cutting a piece at a bevel
US4613120A (en) * 1985-05-28 1986-09-23 Kozar John J D-clamp vise
US4995599A (en) * 1987-09-30 1991-02-26 Carl Ullrich Peddinghaus Machinist's vise with adjustable pressure limiter
US5002264A (en) * 1988-09-27 1991-03-26 Warren Tool Corporation Mitered face for jaws of a clamp and a clamp employing a mitered face
US5135209A (en) * 1991-11-12 1992-08-04 Penny Thomas H Pipe clamp apparatus
US5443246A (en) * 1993-11-30 1995-08-22 Peterson; Donovan J. Clamp jaw extender for bar clamps
US6039313A (en) * 1997-01-23 2000-03-21 Eric J. Baculy Clamp fixtures
WO2000062979A1 (en) * 1999-04-15 2000-10-26 Electro Scientific Industries, Inc. Gripper jaws for tools of different diameter
US6244582B1 (en) * 1999-09-24 2001-06-12 Dante A. Marcolina System and method for altering the size and configuration of a traditional carpenter's clamp
US6685176B2 (en) * 2001-10-18 2004-02-03 Woodworker's Supply, Inc. Clamp pad and bar clamp assembly
CN104162798A (en) * 2014-07-31 2014-11-26 瓦房店轴承砂轮制造有限公司 Centering and clamping mold for automobile double-fork part

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US708038A (en) * 1902-01-13 1902-09-02 Charles R Harper Vise and bracket.
US1189397A (en) * 1915-05-26 1916-07-04 Joseph A Simon Lumber-clamp.
US1393083A (en) * 1921-04-25 1921-10-11 William A Campbell Vise
US1498638A (en) * 1922-09-08 1924-06-24 Charles B Periolat Press
US1783713A (en) * 1927-08-22 1930-12-02 Adjustable Clamp Co Adjustable clamp
US1914291A (en) * 1931-11-10 1933-06-13 Thomas F Reid Carpenter's clamp
US2894548A (en) * 1956-01-09 1959-07-14 Peck Rudolph Clamp with interchangeable pressure pad
US3425098A (en) * 1967-10-25 1969-02-04 Boeing Co Adjustable toggle clamp

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US708038A (en) * 1902-01-13 1902-09-02 Charles R Harper Vise and bracket.
US1189397A (en) * 1915-05-26 1916-07-04 Joseph A Simon Lumber-clamp.
US1393083A (en) * 1921-04-25 1921-10-11 William A Campbell Vise
US1498638A (en) * 1922-09-08 1924-06-24 Charles B Periolat Press
US1783713A (en) * 1927-08-22 1930-12-02 Adjustable Clamp Co Adjustable clamp
US1914291A (en) * 1931-11-10 1933-06-13 Thomas F Reid Carpenter's clamp
US2894548A (en) * 1956-01-09 1959-07-14 Peck Rudolph Clamp with interchangeable pressure pad
US3425098A (en) * 1967-10-25 1969-02-04 Boeing Co Adjustable toggle clamp

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191367A (en) * 1977-11-16 1980-03-04 Sheterom Samuel G Jr Fluid-operated vise with jaw mounting system
EP0017949A1 (en) * 1979-04-18 1980-10-29 Häfele KG Device for clamping two sheets and for drilling holes in these sheets
US4363475A (en) * 1980-09-08 1982-12-14 Mccarty Robert W Vise-like C-clamp for gripping variously shaped work pieces in varying positions
US4431174A (en) * 1981-12-11 1984-02-14 Arnold Varden Vice
FR2541172A1 (en) * 1983-02-17 1984-08-24 Claude Guiu Appliance for cutting a bevel in a component
EP0119890A1 (en) * 1983-02-17 1984-09-26 Claude Guiu Apparatus for making a bevelled cut in a workpiece
US4608900A (en) * 1984-01-06 1986-09-02 Claude Guiu Apparatus for cutting a piece at a bevel
US4613120A (en) * 1985-05-28 1986-09-23 Kozar John J D-clamp vise
US4995599A (en) * 1987-09-30 1991-02-26 Carl Ullrich Peddinghaus Machinist's vise with adjustable pressure limiter
US5002264A (en) * 1988-09-27 1991-03-26 Warren Tool Corporation Mitered face for jaws of a clamp and a clamp employing a mitered face
US5135209A (en) * 1991-11-12 1992-08-04 Penny Thomas H Pipe clamp apparatus
US5443246A (en) * 1993-11-30 1995-08-22 Peterson; Donovan J. Clamp jaw extender for bar clamps
US6039313A (en) * 1997-01-23 2000-03-21 Eric J. Baculy Clamp fixtures
US6338478B2 (en) 1997-01-23 2002-01-15 Adjustable Clamp Company Clamp fixtures
US6402131B1 (en) 1997-01-23 2002-06-11 Adjustable Clamp Company Clamp fixtures
WO2000062979A1 (en) * 1999-04-15 2000-10-26 Electro Scientific Industries, Inc. Gripper jaws for tools of different diameter
US6244582B1 (en) * 1999-09-24 2001-06-12 Dante A. Marcolina System and method for altering the size and configuration of a traditional carpenter's clamp
US6685176B2 (en) * 2001-10-18 2004-02-03 Woodworker's Supply, Inc. Clamp pad and bar clamp assembly
US20040113344A1 (en) * 2001-10-18 2004-06-17 Woodworker's Supply, Inc. Clamp pad and bar clamp assembly
US6889966B2 (en) * 2001-10-18 2005-05-10 Woodworker's Supply, Inc. Clamp pad and bar clamp assembly
CN104162798A (en) * 2014-07-31 2014-11-26 瓦房店轴承砂轮制造有限公司 Centering and clamping mold for automobile double-fork part

Similar Documents

Publication Publication Date Title
US3767183A (en) Clamp having miter jaws
US2606583A (en) Clamping fixture with pressure means in right angularly related planes
US2796787A (en) Doubly padded face-plates for vise jaws
ES2042105T3 (en) WORK BENCH.
US4572420A (en) Hand lever operated vee nail frame assembly machine
ATE5056T1 (en) WORKPIECE HOLDER.
US5002264A (en) Mitered face for jaws of a clamp and a clamp employing a mitered face
US5064178A (en) Mitered face for the jaws of a clamp, and a clamp employing a mitered face
US2525204A (en) Veneer clamp
CA2160254A1 (en) Workbench, Especially a Teaching Aid in the Form of an Ergonomically Designed Multi-Purpose Workbench
US2266507A (en) C-clamp
US3749391A (en) Adjustable fixture means for maintaining wooden truss members in proper position during fabrication of a truss
ATE6567T1 (en) COMBINATION GARDEN TOOL.
ATE44903T1 (en) MULTIPURPOSE CLAMP FOR MACHINING WORKPIECES, ESPECIALLY THOSE MADE OF WOOD.
US2761476A (en) Adjustable corner clamp
BE1001857A6 (en) Universal clamping device for work pieces and a holder used in this
US2439151A (en) Adjustable clamping fixture for workbenches
ES445602A1 (en) Hand tool
US3603580A (en) Clamp having gripping means
DE3165739D1 (en) Work clamp
GB676052A (en) Improvements in or relating to a clamp for fixing the position of a workpiece on a supporting surface
GB561561A (en) Improvements in and relating to dops or holders for diamonds and like tool pieces for grinding or polishing purposes
US1321572A (en) Squaring attachment for clamp-machines
GB706827A (en) Improvements in and relating to clamping devices
JPH035430Y2 (en)