US3819171A - Plunger clamp - Google Patents

Plunger clamp Download PDF

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Publication number
US3819171A
US3819171A US00231997A US23199772A US3819171A US 3819171 A US3819171 A US 3819171A US 00231997 A US00231997 A US 00231997A US 23199772 A US23199772 A US 23199772A US 3819171 A US3819171 A US 3819171A
Authority
US
United States
Prior art keywords
plunger
clamp
control means
adjustable
engage
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
US00231997A
Other languages
English (en)
Inventor
J Sendoykas
A Mcpherson
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.)
Dover Corp
Original Assignee
Dover 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 Dover Corp filed Critical Dover Corp
Priority to US00231997A priority Critical patent/US3819171A/en
Priority to NL7302636.A priority patent/NL165093C/xx
Priority to DE19732310232 priority patent/DE2310232C3/de
Priority to GB1025973A priority patent/GB1415548A/en
Priority to LU67145A priority patent/LU67145A1/xx
Priority to BE128378A priority patent/BE796283A/xx
Priority to FR7307782A priority patent/FR2175031B1/fr
Priority to IT48592/73A priority patent/IT984255B/it
Application granted granted Critical
Publication of US3819171A publication Critical patent/US3819171A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/12—Arrangements for positively actuating jaws using toggle links

Definitions

  • ABSTRACT An improved toggle operated plunger clamp having control means for inhibiting the movement of the plunger when unloaded.
  • the control means includes adjustable collet and adjustable key means operative to engage the clamp at intermediate positions as well as auxiliary retaining means operative in both the fully closed and fully open positions when the plunger is otherwise unloaded.
  • Plunger clamps have a clamping member reciprocably movable back and forth in a clamp body which in turn is usually anchored to a fixture.
  • Such clamps utilize a simple toggle linkage attached to the plunger and the body to reciprocate the plunger and toggle lock the plunger at its extreme extended or retracted position when in engagement with a workpiece respectively as a push clamp or a pull clamp.
  • the plungers of such clamps normally have clearance in the body to allow freedom of reciprocal movement. This frequently leads to undesired gravity actuation of the clamp at'intermediate unloaded positions. Furthermore, a loose fit may be unsatisfactory and detrimental to accurate clamping of the workpiece.
  • the invention comprises an improved toggle operated plunger clamp including control means to inhibit unloaded movement of the plunger.
  • the control means include adjustable means to eliminate undesirable looseness of the plunger while allowing for required reciprocal action and auxiliary retention means for the fully extended and retracted positions.
  • the initial positioning accuracy and firm workpiece positioning of the clamp is greatly enhanced and retained over relatively long usage by the combination of a split collet adjustment to counteract transverse looseness and a hardened key and flat adjustment to counteract rotational looseness.
  • An adjustable lock nut is provided on the plunger to engage a shoulder on the body thereby providing a stop for toggle locking action in the fully extended plunger position when a workpiece is not engaged.
  • Conical depressions in the toggle linkage engageable with conical belleville spring washers provide auxiliary retention for the fully retracted position even in the absence of workpiece loading.
  • FIG. 1 is a side elevation of the plunger clamp showing portions cut away for clarity
  • FIG. 2 is a top elevation of the plunger clamp showing portions cut away for clarity
  • FIG. 3 is a partial end elevation of the plunger clamp.
  • theclamp includes a body substantially cylindrical in shape and welded or otherwise attached to a base 12.
  • the base 12 includes holes 14 for bolts or other fastening means suitable for attachment to a supporting structure, not shown.
  • the cylindrical body 10 may be welded to the base 12 in any rotative position desired.
  • Concentrically located in the body 10 is a plunger 16 having a threaded bore hole 18 suitable for yoke 30 to provide a pivot for the handle 32.
  • a second pin 38 located in a bore hole 40 through both sides of the yoke 30 provides a pivot for one end of the toggle link 42.
  • the other end of the toggle link 42 in turn is attached to the plunger 16 by a pivot pin 44 located in a bore hole 46 through the fork 48 of the plunger 16 and the toggle link 42.
  • the plunger 16 is centered in the body 10 by a collet 50.
  • the collet 50 is split at 52 and engages a conical bore hole 54 in the plunger end 25 of the body 10.
  • the collet 50 also engages the body 10 in the threaded bore at 56.
  • the inner bore 58 of the collet 50 squeezingly engages the plunger 16.
  • the collet 50 can be adjusted to take up all clearance, inhibit and eliminate transverseplay of the plunger 16 relative to the body 10 and provide desired frictional retention merely by turning the collet with a wrench in engagement with the hexagonal end 60 of the collet.
  • the plunger 16 includes a flat 62 best shown in FIG. 3, which extends the greater part of the length of the plunger and engages a hardened key 64 in the shape of a disc, as shown in FIGS. 1 and 2.
  • the disc 64 is set in transverse shoulder bore 66 formed in the wall of the bore hole 68.
  • a set screw 70 located in a threaded hole 72 in the body 10 adjustably applies a force to the key 64 and flat 62 thereby taking up all clearance, inhibiting the rotational of play of the plunger 16 and providing additional desired frictional retention.
  • Altemately twin set screws laterally spaced on either side of the vertical plane containing the plunger axis and engaging the key 64 may be provided.
  • the bore hole 68 intersects the bore hole 20 to form a shoulder 74.
  • the shoulder 74 is engageable with a circular nut 76 threaded on the fork 48 of the plunger.
  • the nut 76 includes a plurality ofholes 78 adapted for the insertion ofa metal pin to turn the nut.
  • the nut 76 is suitably adjusted for engagement with the shoulder 74 for tight toggle locking action when the plunger is unloaded, as shown in solid outline in FIG. 1 thereby providing auxiliary end position retention for unloaded plunger.
  • the resistance of the workpiece provides the necessary force for tight toggle locking action and the nut 76 is therefore not in forceful engagement with the shoulder 74.
  • After proper adjustment of the nut 76 it may be permanently retained in position by any of the conventional hardenable glues for setting a nut in permanent position.
  • the link 42 includes a downwardly open ended slot 80.
  • the slot 80 is adapted to fit over the central portion of the pin 34 when the clamp is in fully open position, as shown by the phantom outline 82 of the toggle link 42 and handle 32.
  • a conical depression 84 surrounds the closed end of slot 80 on either side and is located in the shallow bore 86 which surrounds the slot 80, except for the open end thereof.
  • the conical bore 84 on each side of the slot 80 is engageable with the twin opposed belleville washers 88 mounted on the pivot pin 34.
  • a small collar 90 retains the belleville washers 88 separated and against the yoke 30, as shown clearly in FIG. 2.
  • the conical bore 84 and slot 80 are so related that the conical bore 84 is substantially more than in arcuate extent from the corner 92 to the corner 94 on either side of the slot 80. Therefore, when the clamp is fully opened and the slot 80 in the link 42 pulled down over the shaft 32 and collar 90, the belleville washers 88 are resiliently spread by the comers 92 and 94 before snapping into place in the conical depressions 84. This produces the snap action auxiliary retention for the fully open position thus assuring that the handle and plunger will not move under vibration or otherwise than by intentional operation when the plunger is fully retracted.
  • An improved double action toggle plunger clamp comprising a body, a plunger adapted for reciprocal movement within said body, toggle actuating means adapted to reciprocate said plunger and lock same in either fully extended or fully retracted position when said plunger is subjected to an opposing axial load, and characterized by control means to inhibit the unloaded movement of said plunger, said control means including adjustable frictional means interengaging between said body and plunger at intermediate positions of said plunger, additional control means for retaining said plunger at one extremity position when said plunger is not subjected to an opposing axial load rendered inoperative when said plunger is subjected to an opposing axial load, and further additional control means for retaining said plunger in its other extremity position where it is not subjected to an opposing axial load.
  • control means includes means to remove rotational lost motion of said plunger.
  • control means includes a longitudinally extending flat on said plunger and an adjustable key member positioned in said body and adapted to engage said flat to remove rotational lost motion of said plunger.
  • said additional control means includes a shoulder in said body and adjustable nut means on said plunger adapted to engage said shoulder upon reciprocation of said plunger to one extremity of movement.
  • said further additional control means includes a conical depression in said actuating means and conical spring washer means on said body adapted to engage said conical depression upon reciprocation of said plunger to one extreme of movement.
  • adjustable means includes collet means engaging said body and adapted for adjustable tightening about said plunger to remove transverse lost motion of said plunger.
  • control means includes a longitudinally extending flat on said plunger and an adjustable key member positioned in said body and adapted to engage said flat to remove rotational lost motion of said plunger.
  • said further additional control means includes a slot in said actuating means, a conical depression extending about one end of said slot and conical spring washer means on said body adapted to engage said conical depression upon reciprocation of said plunger to one extremity of movement.
  • An improved plunger clamp comprising a body, a plunger adapted for reciprocal movement within said body, actuating means adapted to reciprocate said plunger, said actuating means including a handle pivotally mounted on said body and a toggle link pivotally attached to said handle at one end and pivotally attached to said plunger at the other end, adjustable collet means concentrically mounted in said body about said plunger, a longitudinally extending flat in said plunger, an adjustable key member positioned in said body and engaging said flat, a shoulder in said body and adjustable nut means on said plunger adapted to engage said shoulder at one extreme of movement of said plunger, a slot opening in said toggle link having a coni cal depression extending about the closed end of the slot, and conical spring washer means on said body adapted to engage said conical depression at the other extreme of movement of said plunger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Jigs For Machine Tools (AREA)
US00231997A 1972-03-06 1972-03-06 Plunger clamp Expired - Lifetime US3819171A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00231997A US3819171A (en) 1972-03-06 1972-03-06 Plunger clamp
NL7302636.A NL165093C (nl) 1972-03-06 1973-02-26 Dubbelwerkende plunjerklem.
DE19732310232 DE2310232C3 (de) 1972-03-06 1973-03-01 Spannvorrichtung zum Festspannen von Werkstücken
LU67145A LU67145A1 (ru) 1972-03-06 1973-03-02
GB1025973A GB1415548A (en) 1972-03-06 1973-03-02 Plunger operated clamps
BE128378A BE796283A (fr) 1972-03-06 1973-03-05 Dispositif de serrage a plongeur
FR7307782A FR2175031B1 (ru) 1972-03-06 1973-03-05
IT48592/73A IT984255B (it) 1972-03-06 1973-03-05 Perfezionamento nei dispositivi di serraggio rilasciabile per il fissaggio di oggetti in lavora zione meccanica

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00231997A US3819171A (en) 1972-03-06 1972-03-06 Plunger clamp

Publications (1)

Publication Number Publication Date
US3819171A true US3819171A (en) 1974-06-25

Family

ID=22871464

Family Applications (1)

Application Number Title Priority Date Filing Date
US00231997A Expired - Lifetime US3819171A (en) 1972-03-06 1972-03-06 Plunger clamp

Country Status (7)

Country Link
US (1) US3819171A (ru)
BE (1) BE796283A (ru)
FR (1) FR2175031B1 (ru)
GB (1) GB1415548A (ru)
IT (1) IT984255B (ru)
LU (1) LU67145A1 (ru)
NL (1) NL165093C (ru)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2905689A1 (de) * 1978-03-17 1979-09-27 Outboard Marine Corp Spannvorrichtung, insbesondere zum ausrichten der abschlusskappe einer pleuelstange
USRE31991E (en) * 1979-05-17 1985-09-24 Single guide rod actuating unit
US5688014A (en) * 1994-11-14 1997-11-18 Kot; Norbert J. Clamp having self-limiting internal overstress relief
US5857737A (en) * 1996-12-13 1999-01-12 Hmc-Brauer Limited Clamp
EP0895830A2 (en) * 1997-08-05 1999-02-10 Delaware Capital Formation, Inc. Push-pull plunger clamp
US5967708A (en) * 1998-03-12 1999-10-19 Framatome Technologies, Inc. Reactor vessel head tool positioning device
US5975605A (en) * 1994-11-14 1999-11-02 Kot; Norbert J Enclosed clamping or gripping device with accessible load controlling spring

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3130942A1 (de) * 1981-08-05 1983-04-28 Tünkers Maschinenbau GmbH, 4030 Ratingen Druckmittelbetaetigbare kniehebelspannvorrichtung mit elastischem federgelenk und loesbar befestigtem spannarm

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1612317A (en) * 1925-07-23 1926-12-28 Int Comb Eng Corp Method of and apparatus for welding
US1910121A (en) * 1932-06-07 1933-05-23 Muntz Eric Percival Clamp for wire, rods, and the like
GB459205A (en) * 1936-02-15 1937-01-04 Julius Brockhaus Improvements in vices
US2567436A (en) * 1949-03-29 1951-09-11 Lapeer Mfg Company Toggle clamp
US2588745A (en) * 1950-02-27 1952-03-11 Mckenzie Clarence Vincent Rapidly adjustable press
US3009694A (en) * 1960-09-19 1961-11-21 Leland F Blatt Toggle clamp
US3027154A (en) * 1959-10-14 1962-03-27 Western Electric Co Aligning and clamping fixture
US3035831A (en) * 1960-11-29 1962-05-22 Leland F Blatt Toggle clamp
US3578307A (en) * 1969-05-06 1971-05-11 Coy B Lock Pipe wrench construction
US3628783A (en) * 1969-10-29 1971-12-21 Leland F Blatt Clamps
US3735972A (en) * 1971-10-06 1973-05-29 L F Blatt Push/pull plunger clamp with take up for wear

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1612317A (en) * 1925-07-23 1926-12-28 Int Comb Eng Corp Method of and apparatus for welding
US1910121A (en) * 1932-06-07 1933-05-23 Muntz Eric Percival Clamp for wire, rods, and the like
GB459205A (en) * 1936-02-15 1937-01-04 Julius Brockhaus Improvements in vices
US2567436A (en) * 1949-03-29 1951-09-11 Lapeer Mfg Company Toggle clamp
US2588745A (en) * 1950-02-27 1952-03-11 Mckenzie Clarence Vincent Rapidly adjustable press
US3027154A (en) * 1959-10-14 1962-03-27 Western Electric Co Aligning and clamping fixture
US3009694A (en) * 1960-09-19 1961-11-21 Leland F Blatt Toggle clamp
US3035831A (en) * 1960-11-29 1962-05-22 Leland F Blatt Toggle clamp
US3578307A (en) * 1969-05-06 1971-05-11 Coy B Lock Pipe wrench construction
US3628783A (en) * 1969-10-29 1971-12-21 Leland F Blatt Clamps
US3735972A (en) * 1971-10-06 1973-05-29 L F Blatt Push/pull plunger clamp with take up for wear

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Frictional Supports, Kasper, L., Product Engineering, April, 1945, pp. 272 273. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2905689A1 (de) * 1978-03-17 1979-09-27 Outboard Marine Corp Spannvorrichtung, insbesondere zum ausrichten der abschlusskappe einer pleuelstange
USRE31991E (en) * 1979-05-17 1985-09-24 Single guide rod actuating unit
US5688014A (en) * 1994-11-14 1997-11-18 Kot; Norbert J. Clamp having self-limiting internal overstress relief
US5975605A (en) * 1994-11-14 1999-11-02 Kot; Norbert J Enclosed clamping or gripping device with accessible load controlling spring
US5857737A (en) * 1996-12-13 1999-01-12 Hmc-Brauer Limited Clamp
EP0895830A2 (en) * 1997-08-05 1999-02-10 Delaware Capital Formation, Inc. Push-pull plunger clamp
US5904349A (en) * 1997-08-05 1999-05-18 Delaware Capital Formation, Inc. Push-pull clamp
EP0895830A3 (en) * 1997-08-05 2000-10-04 Delaware Capital Formation, Inc. Push-pull plunger clamp
US5967708A (en) * 1998-03-12 1999-10-19 Framatome Technologies, Inc. Reactor vessel head tool positioning device

Also Published As

Publication number Publication date
FR2175031A1 (ru) 1973-10-19
GB1415548A (en) 1975-11-26
NL7302636A (ru) 1973-09-10
DE2310232B2 (de) 1976-05-20
DE2310232A1 (de) 1973-09-13
LU67145A1 (ru) 1973-09-06
IT984255B (it) 1974-11-20
NL165093C (nl) 1981-03-16
FR2175031B1 (ru) 1978-03-10
NL165093B (nl) 1980-10-15
BE796283A (fr) 1973-09-05

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