US3857600A - Locking means for clamps - Google Patents

Locking means for clamps Download PDF

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Publication number
US3857600A
US3857600A US00399308A US39930873A US3857600A US 3857600 A US3857600 A US 3857600A US 00399308 A US00399308 A US 00399308A US 39930873 A US39930873 A US 39930873A US 3857600 A US3857600 A US 3857600A
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US
United States
Prior art keywords
clamp
lock cam
lock
piece
cam
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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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US00399308A
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English (en)
Inventor
S Hasegawa
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.)
Nittan Kohki Co Ltd
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Nittan Kohki Co Ltd
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/44—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces
    • B66C1/48—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces to vertical edge portions of sheets, tubes, or like thin or thin-walled articles

Definitions

  • Locking is realized by combination of cam members eccentric with regard to each other, one pair of which is provided on the clamp piece and the other pair of which is provided on an axis located near the clamp piece so that the latter pair of cam members is turned by a locking lever and restricts movement of the clamp piece by contacting the former.
  • the clamp piece can be locked at any position without losing clamping ability when a plate to be clamped is inserted.
  • SHEU 3 BF 5 This invention relates to a lock apparatus for locking a clamp piece of a clamp for clamping steel plates or similar plate members in the clamping state and in the releasing state.
  • clamp piece is adapted to constantly project inside of the clamp slit, said clamp piece interferes with the operation of clamping plat'e members, whereby the operational efficiency is decreased.
  • An object of this invention is to provide an apparatus which will control locking of the clamp in the clamping state and in the releasing state so as to increase the safety of the clamp by precluding the risk of occurrence of detachment of the suspended plate members therefrom. Said apparatus will further-prevent the clamp piece from interfering with the clamping-operation and will also'allow the switchover of the lock means with simplicity.
  • FIG. 1 is a perspective showing a preferred embodiment of this invention
  • FIG. 2 is a vertical section showing the clamping state of the same
  • FIG. 3 is a vertical section of the same showing the state in which the clamp is released
  • FIG. 4 is a diagram showing the clamping state of the principal part of the lock apparatus of the same.
  • FIG. 5 is a diagram showing the state in which the clamp is released
  • FIG. 6 is an elevation showing the detail of a clamp piece built in the same
  • FIG. 7 is'a sectional view of the clamp piece taken on the line VI-VI as indicated by arrows in FIG. 6;
  • FIG. 8 is an elevation showing the detail of'a lock cam
  • FIG. 9 is a cross-sectional plan showing the particulars of the lock cam.
  • the numeral ll designates a clamp body comprising side plates 12 and 13 secured in a state in which a required space is formed between the corresponding faces of said side plates 12 and 13.
  • a clamp slit 14 for inserting a plate member A thereinto is provided in each side plate l2, 13 of the body ll upwardly from the lower edge thereof.
  • a pad 15 is secured to one side of the clamp slit 14 of the side plates 12 and 13.
  • a clamp piece 17 On the other side of the clamp slit I4 is a clamp piece 17 with its base end portion pivoted on an axis 16 provided in a slightly lower portion between the side plates 12 and 13, the forward end of the clamp piece 17 being oscillatable for contact with and detachment from the pad 15, and the clamp piece 17 and the pad 15 being adapted to clamp therebetween a plate member, such as a steel plate or the like.
  • a bell crank 23 With its middle portion pivoted externally on an axis 22 mounted between said side plates 12 and 13, a rod 25 being pivoted at its upper end by a pin 24 on the right-hand end portion of the crank as shown in FIG. 2, the lower end of the rod 25 being pivoted by a pin 26 in the middle portion adjacent to the forward end of the clamp piece 17, the clamp piece 17 and the bell crank 23 being connected by a rod 25 so as to rotate in the opposite directions.
  • an upright L-shaped rod 27 pivoted at its lower end by a pin 28; a suspension ring 29 projecting upwardly from the upper part of thebody 11 is connected to the upper end of the L--shaped rod 27.
  • the plate member A is clamped between the pad 15 and the clamp piece 17 by hoisting the suspension ring 29 by means of a hook on a crane or the like, whereby the forward end of the clamp piece 17 isbrought adjacent the pad 15 through the action of the bell crank 23 and the rod 25.
  • the L-shaped rod 27, bell crank 23, link 25 and clamp piece 17 are adapted to have an increased clamping strength in proportion to an increase in the weight of the suspended plate member A.
  • a spring 30 is extended between the lower edge of the middle portion of the bell crank 23 and a suitable position in the left-hand middle portion of the body 11.
  • a clockwise rotary force is imparted to the bell crank 23 in FIG. 2 by the tension of said spring 30, and a rotary force in the clamping direction is constantly imparted to the clamping piece 17 by said clockwise rotary force through the link 25.
  • a lock cam 32 is rotatably mounted by an axis 31 provided between the side plates 12 and 13 in a position adjacent the right-hand side of the base end portion of the clamp piece 17 as shown in FIG. 2.
  • the lock cam 32 comprises cam members 35 and 36 continuously formed at both ends of a cylindrical member 34 and is provided with a penetration hole 33 externally fitted to the axis 31 so as to be eccentric with regard to the axial center of the penetration hole and the respective center of each other.
  • a pin 37 is planted on the lateral face of the cam member 36.
  • cam member 36 being disposed so that its exterior periphery will correspond with that of .the other cam member 20 of the clamp piece 17.
  • a lock lever 38 is pivoted at its base end by a pin 39 on the right-hand end portion of the clamp body 11 as shown in FIG. 2, said lock lever 38 being fitted oscillatably.
  • a spring 40 is extended between the free end of the said lever 38 and the cam member 36 of the lock cam 32.
  • FIGS. 4 and 5 show therelation between the lock cam 32 when activated by the operation of the lever 38 and the cam members of the clamp piece 17. If the lever 38 is operated so as to set it upright, the spring 40 draws the lock cam 32 in the direction B as indicated by the arrow in FIG. 4, whereby a counterclockwise rotary force centering on the axis 31 is imparted to the lock cam 32 with the, result that the cam members 19 and 35 on the front side are brought into abutment against each other, and the cam members and 36 on the reverse side are detached from each other.
  • the contact point P between the cam members 19 and 35 is located above the line connecting the centers of the axes 16 and 31, with the result that the clamp piece 17 is rotatable only in the direction C indicated by the arrow, rotation in the opposite direction being precluded by the frictional force of the contact point, thereby sustaining the clamping of the clamp piece 17 in a locked state.
  • the spring 40 draws the lock cam 32 in the direction D as indicated by arrow in FIG. 5 thereby imparting'a clockwise rotary force centering on the axis 31 to said cam 32, with the result that the cam members 19 and 35 on the front side are detached from each other and the cam members 20 and 36 on the rear side being brought into abutment against each other.
  • the contact point P is located below the line connecting the centers of the axes l6 and 31 thereby enabling the clamp piece 17 to rotate in the direction E as indicated by arrow, the rotation in the opposite direction being precluded by the frictional force of the contact point'P'. The result is that'release of the clamp piece 17 is sustained in a locked state.
  • the lever 38 is set downwardly through the dead point of the spring 40 as shown in FIG. 3, whereby the clamp piece 17 is released from the locked state of clamping as shown in FIG. 5. Then, the suspension ring 29 is pressed downwardly against the spring 30 thereby rotating the clamp piece 17 in the direction E as indicated by arrow in FIG. 5 by means of the bell crank 23 and the link 25 so that said clamp piece 17 will be detached from the pad 15.
  • a lock apparatus for a clamp said clamp having a clamp body, a clamping piece rotatably pivoted at its base end on said clamp body, an abutment plate affixed to said clamp body opposite the clamping piece, and lifting means pivotally attached to said clamp body and to said clamping piece, whereby said clamping piece will rotate in the clamping direction toward the abutment plate when the clamp body is suspended by the lifting means and the item to be held will be clamped therebetween, said lock apparatus comprising a pair of base cam members located on the base end of said clamp piece eccentric with regard to each other and the pivotal axis of the base end portion of the clamp piece,
  • a lock cam comprising a pair of lock cam members

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US00399308A 1972-10-25 1973-09-21 Locking means for clamps Expired - Lifetime US3857600A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972123696U JPS524681Y2 (xx) 1972-10-25 1972-10-25

Publications (1)

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US3857600A true US3857600A (en) 1974-12-31

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US00399308A Expired - Lifetime US3857600A (en) 1972-10-25 1973-09-21 Locking means for clamps

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JP (1) JPS524681Y2 (xx)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960264A (en) * 1975-01-28 1976-06-01 Burroughs Corporation Item transport apparatus
FR2416189A2 (fr) * 1978-02-01 1979-08-31 Stas Soc Tech Access Spec Leve-tole
US4327944A (en) * 1978-12-08 1982-05-04 Charles Langloy Tongs designed to lift and handle metal sheets and similar materials
FR2499534A1 (fr) * 1981-02-09 1982-08-13 Stas Soc Tech Access Spec Leve-tole a came de serrage muni d'un dispositif de securite
US4492401A (en) * 1983-06-14 1985-01-08 J. C. Renfroe And Sons, Inc. Non-marring lifting clamp
US4498699A (en) * 1982-10-29 1985-02-12 J. C. Renfroe And Sons, Inc. Lifting clamp locking mechanism with push button release handle
US4884836A (en) * 1988-08-09 1989-12-05 Cooper Industries, Inc. Plate lifting clamp
EP0424602A1 (de) * 1989-10-27 1991-05-02 SIEGERT & CO. GMBH & Co. Klemme für Blechtransport
US20090139156A1 (en) * 2007-11-29 2009-06-04 Thomas & Betts International, Inc Fast beam clamp
US20090218836A1 (en) * 2008-03-03 2009-09-03 Cooper Brands, Inc. Plate Lifting Clamp
US20100109362A1 (en) * 2007-05-08 2010-05-06 Peter Paul Alexander Berk Lifting clamping
US20110227357A1 (en) * 2010-03-19 2011-09-22 Eric Bourque Sheet metal gripping device
US11472674B2 (en) 2019-02-28 2022-10-18 Laitram, L.L.C. Lifting clamp including pivot leg

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010001086A (ja) * 2008-06-18 2010-01-07 Eagle Kuranpu Kk 吊りクランプのロック装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3297354A (en) * 1966-04-11 1967-01-10 Renfroe & Sons J C Lifting clamp
US3370881A (en) * 1966-04-11 1968-02-27 Renfroe & Sons J C Lifting clamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3297354A (en) * 1966-04-11 1967-01-10 Renfroe & Sons J C Lifting clamp
US3370881A (en) * 1966-04-11 1968-02-27 Renfroe & Sons J C Lifting clamp

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960264A (en) * 1975-01-28 1976-06-01 Burroughs Corporation Item transport apparatus
FR2416189A2 (fr) * 1978-02-01 1979-08-31 Stas Soc Tech Access Spec Leve-tole
US4327944A (en) * 1978-12-08 1982-05-04 Charles Langloy Tongs designed to lift and handle metal sheets and similar materials
FR2499534A1 (fr) * 1981-02-09 1982-08-13 Stas Soc Tech Access Spec Leve-tole a came de serrage muni d'un dispositif de securite
US4498699A (en) * 1982-10-29 1985-02-12 J. C. Renfroe And Sons, Inc. Lifting clamp locking mechanism with push button release handle
US4492401A (en) * 1983-06-14 1985-01-08 J. C. Renfroe And Sons, Inc. Non-marring lifting clamp
US4884836A (en) * 1988-08-09 1989-12-05 Cooper Industries, Inc. Plate lifting clamp
EP0424602A1 (de) * 1989-10-27 1991-05-02 SIEGERT & CO. GMBH & Co. Klemme für Blechtransport
US20100109362A1 (en) * 2007-05-08 2010-05-06 Peter Paul Alexander Berk Lifting clamping
US8226139B2 (en) * 2007-05-08 2012-07-24 The Crosby Group LLC Lifting clamp
US20090139156A1 (en) * 2007-11-29 2009-06-04 Thomas & Betts International, Inc Fast beam clamp
US8038106B2 (en) 2007-11-29 2011-10-18 Thomas & Betts International, Inc. Fast beam clamp
USRE45825E1 (en) 2007-11-29 2015-12-22 Thomas & Betts International Llc Fast beam clamp
US7819448B2 (en) 2008-03-03 2010-10-26 Cooper Brands, Inc. Plate lifting clamp
US20090218836A1 (en) * 2008-03-03 2009-09-03 Cooper Brands, Inc. Plate Lifting Clamp
US20110227357A1 (en) * 2010-03-19 2011-09-22 Eric Bourque Sheet metal gripping device
US8336935B2 (en) * 2010-03-19 2012-12-25 Eric Bourque Sheet material gripping device
US11472674B2 (en) 2019-02-28 2022-10-18 Laitram, L.L.C. Lifting clamp including pivot leg

Also Published As

Publication number Publication date
JPS524681Y2 (xx) 1977-01-31
JPS4977672U (xx) 1974-07-05

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