US3356406A - Lifting clamp - Google Patents
Lifting clamp Download PDFInfo
- Publication number
- US3356406A US3356406A US464135A US46413565A US3356406A US 3356406 A US3356406 A US 3356406A US 464135 A US464135 A US 464135A US 46413565 A US46413565 A US 46413565A US 3356406 A US3356406 A US 3356406A
- Authority
- US
- United States
- Prior art keywords
- slot
- shackle
- cam jaw
- cam
- article
- 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
Links
- 239000003351 stiffener Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B66C1/62—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 comprising article-engaging members of a shape complementary to that of the articles to be handled
- B66C1/64—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 comprising article-engaging members of a shape complementary to that of the articles to be handled for T- or I-section beams or girders
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
Definitions
- sorting hooks When working with structural members, such as I- beams, H-beams, plates and the like, it is frequently necessary that the structural articles be lifted, stacked, unstacked, arranged into piles, or selected from a pile and moved to another location.
- Presently available clamps used to accomplish some of these functions are referred to as sorting hooks.
- the present clamp is useful as a sorting hook but it has other uses and is not restricted to sorting functions.
- sorting hooks grasp an I-beam or the like at one end and can apply a pulling force only in a direction toward the other end of the beam. It is frequently desirable, however, to grip and hold a structural article in a variety of positions. For example, it may be desirable for a hook shaped clamp to grasp and hold a structural article with the lifting force acting parallel to and either inwardly or outwardly of the slot of the hook. In other situations it may be necessary for the same clamp to grasp and hold a structural article with the lifting force acting transverse to the slot. Thus if a sorting hook or similar clamp will grasp and hold a structural article only when the lifting force is applied in one direction the use of the sorting hook is limited.
- Another object of this invention is to provide a hook shaped clamp in which the force acting on the shackle to urge the jaws into gripping relation may be applied from various directions and still effectively grip the article to be moved.
- a further object of this invention is to provide a hook shaped clamp having a horizontal slot in which the gripping force may be applied from either direction parallel to the slot and in any direction upwardly of the slot.
- a lifting clamp comprising a body including a horizontal slot for receiving a structural article, a cam jaw pivotally mounted in the body on one side of the slot to be pivoted into a gripping relation with an article in the slot, and a shackle pivotally mounted on the cam jaw to permit the shackle to pivot the cam jaw into the gripping relation when force is applied to the shackle upwardly with respect to the slot or in either direction parallel to the slot.
- the cam is part of a cam jaw assembly including a cam jaw and a first pivot pin pivotally mounting the cam jaw to the body on one side of the slot. It is also preferred that the shackle be pivotally mounted on the cam jaw by a second pivot pin spaced from the first pivot pin to permit a force applied to the shackle in a direction which pivots the shackle away from the cam jaw to pivot the cam jaw to a gripping relation with a structural article in the slot.
- the sorting book have an abutment means to be engaged by the shackle to permit a force applied to the shackle in a direction which urges 3,356,4fi6 Patented Dec. 5, 1967 the shackle into engagement with the abutment means to pivot the cam jaw into a gripping relation with an article in the slot.
- this abutment means is a surface which is a part of the cam jaw assembly.
- the surface on the cam jaw assembly which abuts the shackle is desirably either the first pivot pin or a portion of the cam jaw member itself.
- the clamps of this invention may also include locking means connected to the cam jaw member for locking the cam jaw in gripping relation to an article in the slot.
- FIGURE 1 is a top plan View of a clamp constructed according to the invention.
- FIGURE 2 is a vertical section of the clamp taken along line 22 of FIGURE 1;
- FIGURE 3 is an end view of the clamp partially in section
- FIGURE 4 is a top plan view of a modified clamp constructed in accordance with the invention.
- FIGURE 5 is a vertical section of the modified clamp taken along line 55 of FIGURE 4;
- FIGURE 6 is an end view of the modified clamp
- FIGURE 7 illustrates the use of a pair of the clamps to lift a single horizontal I-beam
- FIGURE -8 illustrates the use of the clamp to move a structural plate.
- a body generally 10 is comprised of a pair of body plates 12 and 14 spaced apart by stiffener plates 16 and 18 which are welded or otherwise securely aflixed to the insides of plates 12 and 14.
- Each of plates 12 and 14 has a horizontal opening forming a horizontal slot 20 for receiving a structural article.
- the slot 20 for example, may be disposed at non-horizontal positions when the clamp is disposed at a position other than the reference position.
- a cam jaw assembly is pivotally mounted in the body on one side of the slot.
- the cam jaw assembly generally 22, is mounted between plates 12 and 14 at a position above horizontal slot 20.
- the cam jaw assembly 22 includes a pair of spaced cam jaws 24 and 26, having gripping edges 28, and a pivot pin 30 pivotally mounting jaws 24 and 26 between plates 12 and 14.
- a shackle 32 having a lifting connection eye 34 is pivotally mounted on cam jaw assembly 22 by a pivot pin 36 which is vertically spaced below pivot pin 30. Pin 36 connects shackle 32 directly to jaws 24 and 26.
- Shackle 32 has an arcuate recess 37 for engaging the round pin 30 when the shackle is pivoted against pin 30. This groove permits eye 34 to be pivoted inwardly relative to the jaws 24 further than would be otherwise possible. It will be appreciated, of course, that the shape of shackle 32 may be varied in other ways to permit the eye to be pivoted to the desired position.
- means may be provided to lock the cam jaws in a gripping relation to an article in horizontal slot 20.
- the locking means is as follows.
- a U-shaped latch 38 is pivotally mounted on body plates 12 and 14 by pivot bolts 40 and 42 which are held in place by nuts 41 and 43.
- a coil spring 44 is connected to the jaws 24 and 26 by a pin 46 and to latch 38 by a pin 48 extending across the inside of the latch.
- a stop pin 50 is mounted between the side plates 12 and 14 beneath latch 38.
- a chain 52 is connected to the end of latch 38.
- the lock is of the overcenter type, and is operated by pivoting latch 38 about pivots 40 and 42 against the tension of coil spring 44 until pin 48 is lower than pivot pin 42.
- latch 38 causes spring 44 to pull latch 38 against stop pin 50. In this position, spring 44 urges jaws 24 and 26 into slot 20 and thus causes the jaws to grip an article in slot 20. If desired, the lock may be omitted and the lifting force alone may be relied upon to provide the necessary gripping force on the article in the slot.
- the clamp In use the clamp is placed on the structural article with a portion of the article extending into horizontal slot 20. The operator then pivots latch 38 to the locked position against pin 50 by pulling on chain 52.
- the cam jaw assembly is connected to ashackle, generally 80, having a pair of arms 82 and 84 joined at a :lifting connection eye 86 at their upper ends. Arms 82 and 84 straddle jaw 74 and are pivotally connected thereto by a pin 88 extending between arms 82 and 84 and through jaw 74.
- means may be pro-' vided for locking cam jaw 74 in a gripping relation with an object in slot 70.
- the means is comprised of an overcenter lock having a U-shaped latch 90 mounted on a pair of pivot bolts 92 and 94 which are held in place by nuts 93 and 95 respectively.
- a coil spring 96 is connected by an eyelet 98 to jaw 74 and by a pin pivoting of latch 38 applies tension to spring 44 which g in turn pivots cam jaws 24 and 26 counterclockwise into an initial gripping relation with the article in slot 20.
- the lifting or moving force is then applied to shackle 32 as by a lifting cable or the like connected to eye 34 of the shackle and urges the jaws into a firm gripping relation with the article in the slot.
- the force may also be applied to shackle 32 upwardly in different directions as indicated for example, by arrows C, D and E in FIGURE 2 and jaws 24 and 26 will still be urged firmly against an article in the slot.
- the means by which the forceis transmitted to the jaws will depend on the direction of the force. If the force is applied in the direction indicated by arrows D and E, the force will simply cause the shack-1e to urge jaws counterclockwise. If the force is applied in the direction indicated by arrow C in the shackle will pivot against pin 30 and act as a lever to tend to urge pin 36 outwardly of slot 20 and thus pivot the jaws in the counterclockwise direction.
- the force may also be applied to the shackle downwardly as long as a moment arm is created between pin 36 and pin 30 or between eye 34 and pin 30.
- the moving or lifting force may be applied to the shackle from any direction within an arc of more than 180 about the slot in the body of the clamp.
- a body is comprised of a pair of spaced plates 62 and 64 spaced apart by stiffener plates 66 and 68.
- Each of the plates 62 and 64 has a horizontal opening forming a horizontal slot 70 in the body for receiving a structural article.
- a cam jaw assembly is pivotally mounted in the body on one side of the slot.
- the cam jaw assembly generally 72 is pivotally mounted above horizontal slot 70 near the open end of the slot.
- the cam jaw assembly is comprised of a cam jaw 74, having a gripping edge 76, mounted on a pivot pin 78 extending between side plates 62 and 64.
- the present cam jaw assembly includes a shoulder 79 on the upper end of cam jaw 74. The shoulder defines an arcuate bearing surface.
- Cam jaw 74 is free to pivot into and out of a gripping relation with an article in slot 70.
- a chain 102. is connected to one end of latch 90.
- a stop pin 104 is provided to hold the latch in the locked position.
- the clamp is placed on the structural article with a portion of the article extending into horizontal slot 70.
- the operator then pivots latch 90 to the locked position against pin 104 by pulling on chain 102.
- the resulting tension of spring 96 pivots cam jaw 74 counterclockwise into an initial gripping relation with the article in slot 70.
- the moving or lifting force is then applied to shackle through means connected to eye 86.
- this force is applied parallel to horizontal slot 70 in a direction outwardly of the slot as indicated by arrow X, the force is transmitted through legs 82 and 84 of shackle 80 to pin 88 and tends to pivot jaw 74 counterclockwise about pivot pin 30 thus firmly gripping the article in the slot.
- this force is applied parallel to slot 70 in a direction inwardly of the slot as indicated by arrow Y, the shackle will pivot about pivot pin 88 until the edge of eye 86 engages the bearing surface of shoulder 79 on jaw 74.
- the moving force may also be applied to the shackle in a direc tion downwardly of arrows X and Y as long as a moment arm is created between pivot pin 88 and pivot pin 78 or between shoulder 79 and pivot pin 78 and the force does not interfere with the article in the slot or is not blocked by the body of the clamp.
- FIGURES 7 and 8 illustrate the clamp in use. As may be seen in FIGURE 7, a pair of clamps are being used to lift a horizontal I-beam. The upper flange of the I- beam is inserted into the horizontal slots of each of a pair of clamps with the web of the I-beam extending downwardly between the two spaced body plates of each of the clamps.
- the latches of each of the clamps have been moved to the locked position to provide an initial grip on the I- beam.
- the lifting force which in this use is being applied to the shackles upwardly and outwardly of the horizontal slots, urges the cam jaw assemblies into a firm gripping relation with the I-beam.
- the I-beam is thus held securely in a horizontal position by the two clamps.
- FIGURE 8 illustrates the use of the clamp with the lifting force being applied inwardly of the slot.
- a single clamp is being used to lift a structural plate with the plate lying flat on a pallet or the like.
- the clamp has been placed on the plate with the plate extending into the slot which at that time was orientated horizontally.
- the lock was then moved to the closed position to provide an initial grip on the plate.
- the lifting force applied to the shackle was initially substantially perpendicular to the then horizontal slot and caused the cam jaw assembly to firmly grip the structure plate.
- the clamp also pivoted until its slot was vertical. Throughout the entire movement of the clamp the lifting force was transmitted to the cam jaw assembly and provided a firm grip on the plate.
- a lifting clamp comprising:
- a hook shaped body including a horizontal slot to receive an article
- said cam jaw assembly including a cam jaw member and a first pivot pin pivotally mounting said cam jaw member to said body on one side of the slot;
- a lifting clamp according to claim 1 including looking means connected to said cam jaw member for locking said cam jaw member in gripping relation to a structural article in the slot.
- a lifting clamp according to claim 2 including locking means connected to said cam jaw member for locking said cam jaw member in gripping relation to a structural article in the slot.
- a lifting clamp according to claim 1 wherein said surface for abutting said shackle is defined by said cam jaw member.
- a lifting clamp according to claim 6 including locking means for locking said cam jaw member in gripping relation to a structural article in the slot.
- a lifting clamp comprising in combination:
- a hook shaped body including a pair of spaced side plates, said body defining a slot to receive a structural article
- cam jaw for gripping an article in the slot, a first pivot pin pivotally mounting said cam jaw to said body on one side of said slot;
- a lifting clamp comprising in combination:
- a hook shaped body including a pair of spaced side plates, said body defining a slot to receive -a structural article
- said cam jaw member having a shoulder and including a first pivot pin pivotally mounting said cam member to said body on one side of the slot;
- a lifting clamp comprising a hook shaped body defining a horizontal slot to receive an article
- a cam jaw connected to said body by a first pin above the slot and being movable between an open and a gripping relation with an article in the slot;
- a shackle positioned above the slot and connected to said jaw by a second pin above said slot, said second pin being vertically spaced from said first pin to permit a force applied to the shackle in one direction parallel the slot to bring said cam jaw to a gripping relation with the article in the slot;
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US464135A US3356406A (en) | 1965-06-15 | 1965-06-15 | Lifting clamp |
GB24442/66A GB1116248A (en) | 1965-06-15 | 1966-06-01 | Improvements in and relating to lifting clamps |
JP41036377A JPS4841301B1 (xx) | 1965-06-15 | 1966-06-07 | |
FR64797A FR1482695A (fr) | 1965-06-15 | 1966-06-09 | Crampon de levage |
NL666608056A NL144231B (nl) | 1965-06-15 | 1966-06-10 | Hijsklem. |
BE682517D BE682517A (xx) | 1965-06-15 | 1966-06-14 | |
DE19661481800 DE1481800B1 (de) | 1965-06-15 | 1966-06-15 | Hebeklaue |
DE19661481801 DE1481801B1 (de) | 1965-06-15 | 1966-06-15 | Hebeklaue |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US464135A US3356406A (en) | 1965-06-15 | 1965-06-15 | Lifting clamp |
Publications (1)
Publication Number | Publication Date |
---|---|
US3356406A true US3356406A (en) | 1967-12-05 |
Family
ID=23842714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US464135A Expired - Lifetime US3356406A (en) | 1965-06-15 | 1965-06-15 | Lifting clamp |
Country Status (6)
Country | Link |
---|---|
US (1) | US3356406A (xx) |
JP (1) | JPS4841301B1 (xx) |
BE (1) | BE682517A (xx) |
DE (2) | DE1481801B1 (xx) |
GB (1) | GB1116248A (xx) |
NL (1) | NL144231B (xx) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5036967A (en) * | 1986-07-18 | 1991-08-06 | Rieter Machine Works, Ltd. | Apparatus for extracting bobbin tubes from a magazine |
US20040094982A1 (en) * | 2002-11-18 | 2004-05-20 | Neufeldt Roy E. | Truss hook |
US20090066099A1 (en) * | 2002-11-18 | 2009-03-12 | Neufeldt Roy E | Truss hook |
US9114959B1 (en) * | 2013-09-27 | 2015-08-25 | David John Gallet | Removal tool |
US11472674B2 (en) | 2019-02-28 | 2022-10-18 | Laitram, L.L.C. | Lifting clamp including pivot leg |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53134734A (en) * | 1977-04-28 | 1978-11-24 | Yoshida Kogyo Kk | Suspension device of shape material for surface treatment |
FR2452460A1 (fr) * | 1979-03-30 | 1980-10-24 | Langloy Charles | Pince pour la manutention et le levage de toles ou analogues |
DE3423314A1 (de) * | 1984-06-23 | 1986-01-02 | Pfeifer Seil- Und Hebetechnik Gmbh & Co, 8940 Memmingen | Hebeklemme |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1203108A (fr) * | 1958-07-21 | 1960-01-15 | Dispositif de prise notamment pour le levage des tôles | |
FR1376867A (fr) * | 1962-11-17 | 1964-10-31 | Schmidt | Grappin pour appareils de levage destinés à soulever de lourdes charges, par exemple sous forme d'un mécanisme à crochet pour grues |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2393101A (en) * | 1945-04-14 | 1946-01-15 | Merrill Brothers | Plate lifting clamp |
US2573064A (en) * | 1949-11-24 | 1951-10-30 | Robson Stanley | Lifting clamp |
BE518307A (xx) * | 1952-03-27 | |||
US3041101A (en) * | 1958-01-23 | 1962-06-26 | Lebre Charles Jean Pierre | Clamping tongs for loads |
-
1965
- 1965-06-15 US US464135A patent/US3356406A/en not_active Expired - Lifetime
-
1966
- 1966-06-01 GB GB24442/66A patent/GB1116248A/en not_active Expired
- 1966-06-07 JP JP41036377A patent/JPS4841301B1/ja active Pending
- 1966-06-10 NL NL666608056A patent/NL144231B/xx not_active IP Right Cessation
- 1966-06-14 BE BE682517D patent/BE682517A/xx not_active IP Right Cessation
- 1966-06-15 DE DE19661481801 patent/DE1481801B1/de active Pending
- 1966-06-15 DE DE19661481800 patent/DE1481800B1/de active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1203108A (fr) * | 1958-07-21 | 1960-01-15 | Dispositif de prise notamment pour le levage des tôles | |
FR1376867A (fr) * | 1962-11-17 | 1964-10-31 | Schmidt | Grappin pour appareils de levage destinés à soulever de lourdes charges, par exemple sous forme d'un mécanisme à crochet pour grues |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5036967A (en) * | 1986-07-18 | 1991-08-06 | Rieter Machine Works, Ltd. | Apparatus for extracting bobbin tubes from a magazine |
US20040094982A1 (en) * | 2002-11-18 | 2004-05-20 | Neufeldt Roy E. | Truss hook |
EP1419989A3 (en) * | 2002-11-18 | 2004-05-26 | Roy Edward Neufeldt | Truss hook |
US7059644B2 (en) * | 2002-11-18 | 2006-06-13 | Neufeldt Roy E | Truss gripping hook |
US20060208514A1 (en) * | 2002-11-18 | 2006-09-21 | Neufeldt Roy E | Truss hook |
US7422257B2 (en) | 2002-11-18 | 2008-09-09 | Neufeldt Roy E | Truss gripping hook |
US20090066099A1 (en) * | 2002-11-18 | 2009-03-12 | Neufeldt Roy E | Truss hook |
US9114959B1 (en) * | 2013-09-27 | 2015-08-25 | David John Gallet | Removal tool |
US11472674B2 (en) | 2019-02-28 | 2022-10-18 | Laitram, L.L.C. | Lifting clamp including pivot leg |
Also Published As
Publication number | Publication date |
---|---|
NL144231B (nl) | 1974-12-16 |
DE1481801B1 (de) | 1970-07-30 |
JPS4841301B1 (xx) | 1973-12-05 |
GB1116248A (en) | 1968-06-06 |
DE1481800B1 (de) | 1970-12-17 |
NL6608056A (xx) | 1966-12-16 |
BE682517A (xx) | 1966-11-14 |
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