USRE33881E - Apparatus for lifting concrete panels - Google Patents
Apparatus for lifting concrete panels Download PDFInfo
- Publication number
- USRE33881E USRE33881E US07/607,205 US60720590A USRE33881E US RE33881 E USRE33881 E US RE33881E US 60720590 A US60720590 A US 60720590A US RE33881 E USRE33881 E US RE33881E
- Authority
- US
- United States
- Prior art keywords
- iaddend
- iadd
- yoke
- latch
- release
- 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
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
- B66C1/62—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
- B66C1/66—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 engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof
- B66C1/666—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 engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof for connection to anchor inserts embedded in concrete structures
Definitions
- the present invention relates to hardware for lifting precast concrete panels by engagement with the heads of anchors recessed within the panels, and more particularly, to lifting hardware which includes a safety pin for preventing the unintentional disengagement of the hardware from the anchor head.
- the panels are cast with anchor pins having flared heads that are positioned within hemispherical recesses.
- Many types of lifting hardware have been developed to engage the recessed anchor heads, and such hardware typically includes a connecting member with a slot for engaging the anchor head, and a loop or lifting bail which is easily connected to the cable of a hoist by a hook or shackle.
- That lifting apparatus consists of a lifting body having a forward portion, which includes a spoon-type connecting member and a bail, a release yoke which receives and is pivotally connected to a rearward portion of the lifting body, and a latch yoke pivotally connected to the rearward portion of the lifting body.
- the latch yoke includes a safety latch which cooperates with the connecting member to retain an anchor head within the slot of the connecting member.
- the release yoke receives a lanyard which is pulled to release the apparatus from the anchor head.
- the lifting body rearward portion, release yoke, and latch yoke are all oriented substantially parallel to each other when the hardware is in the locked position and engages an anchor head.
- the release yoke pivots relative to the lifting body, which causes the release yoke and lifting body to assume a release position in which they are angled with respect to each other, and causes the latch yoke to pivot so that the safety latch is displaced away from the connecting member.
- the slot is pivoted away from the anchor head so that the lifting hardware is able to swing free of the concrete panel.
- the aforementioned device has been modified to provide the safety latch with an upwardly extending portion which is parallel to a boss on the release yoke.
- a safety pin is inserted through bores formed in the safety latch and base to prevent relative movement between the release yoke and safety latch.
- the safety pin is attached to the release lanyard so that a downward pull on the lanyard causes the safety pin to be removed from the bores prior to the lanyard becoming sufficiently taut to begin pivoting the release yoke. That device is illustrated in FIG. 1 of the drawings and is labelled "PRIOR ART".
- a disadvantage with that design results from the loose dimensional tolerances of the release yoke, latch yoke, and lifting body, and the loose locational tolerances of the pivot connections between the yokes and the lifting body, which are a consequence of the typically low-cost casting and machining processes used to make the device.
- These loose tolerances frequently provide sufficient play between the components of that device such that the safety latch can be displaced sufficiently, when the apparatus is in the locked position, to enable the connecting member to slide away from its engagement with the anchor head. Consequently, the lifting hardware may disengage from the anchor head prior to the apparatus being pivoted to the release position.
- an apparatus for lifting concrete panels which includes a safety mechanism that prevents the inadvertent separation of the lifting hardware from the anchor head. Furthermore, such a safety device should not add measurably to the overall cost of the lifting apparatus and should be capable of being disengaged by a tugging action on the release lanyard by a user, so that the safety device can be disengaged by a person at a location remote from the lifting apparatus.
- the present invention is an apparatus for lifting concrete panels which includes a safety device that provides a more secure engagement between the lifting apparatus and anchor head that prior art devices, despite the existence of normal out-of-tolerance conditions in the dimensioning of the components of the apparatus, as well as in the location of the pivot and cam connections.
- the safety device of the present invention is used in combination with a lifting apparatus of the type which includes a lifting body having a forward portion adapted to fit within an anchor recess and engage on anchor head, a latch yoke pivotally connected to the rearward end of the lifting body and including a safety latch which cooperates with the forward portion to capture an anchor head within the forward portion, and a release yoke which is pivotally attached to the lifting body.
- the safety device includes a safety pin block which is attached to the rearward end of the release yoke and extends upwardly perpendicularly to the rearward portion of the yoke.
- the rearward end of the safety yoke and the safety pin block include upwardly-angled bores which are aligned when the lifting apparatus is in the locked position.
- a safety pin is inserted into the bores and the connection prevents relative movement between the latch yoke and the release yoke.
- the lifting apparatus of the present invention provides a secure locking arrangement and is unlikely to release from a locked position with an engaged anchor head inadvertently.
- the safety pin bores are oriented to angle rearwardly and outwardly from the lifting apparatus so that the safety pin within the bores points in the direction of a person who would be manipulating the lanyard to disengage the safety mechanism and acuate the release yoke. Consequently, a tug on the lanyard results in a pull on the safety pin which is coaxial, rather than at an angle to the axis of the safety pin, so that the pin is drawn outwardly without being urged against the sides of the bores.
- the bore in the safety pin block includes a pair of detents which engage an annular groove formed in the safety pin, so that the safety pin is less likely to fall out of the bores inadvertently when the lifting apparatus is positioned adjacent to a vertical edge of a concrete panel.
- a lifting apparatus which includes a safety device for preventing the inadvertent disengagement of the lifting apparatus from an anchor head; a lifting apparatus having a safety device which does not add measurably to the overall cost of the apparatus; a lifting apparatus having a safety device whose reliability is virtually unaffected by normal variations in tolerances of the components of the apparatus; and a lifting apparatus in which the safety device can be disengaged relatively easily by a person located away from the apparatus.
- FIG. 1 is a side elevation showing a prior art lifting apparatus
- FIG. 2 is an exploded, perspective view of the lifting apparatus of the present invention
- FIG. 3 is a side elevation of the lifting apparatus of FIG. 2, shown attached to an anchor in a locked position;
- FIG. 4 is a side elevation of the lifting apparatus of FIG. 3, shown actuated to a release position.
- the lifting apparatus of the present invention includes a lifting body 12 having a forward portion 14 which includes a spoon-shaped connecting member 16 and a rearward portion 18.
- the connecting member 16 includes a slot 20 shaped to receive the head 21 of an anchor 22.
- the connecting member 16 is circular in cross section and is sized to fit within the hemispherical recess 23 formed in a present concrete panel 24.
- a bail 26 is pivotally connected to the forward portion 14 above the spoon-shaped connecting member 16, and is sized to receive a shackle 27 of a hoist.
- a release yoke 28 is connected to the lifting body 12 by a pivot connection comprising a nut and bolt combination 29 and includes an upwardly extending forward portion 30 and a rearward portion 31, consisting of a pair of spaced apart legs 32, 33.
- the forward portion 30 of the release yoke 28 includes a transverse bridge 34.
- An oblong latch yoke 35 is connected to an upwardly extending boss 36, located on the rearward portion of the lifting body 12, by a pivot connection consisting of a hex head cap screw and nut combination 37.
- the rearward end of the latch yoke 35 includes a recess (not shown) that receives the upper end of a coil spring 38 that is seated within a recess 39 formed in the rearward portion 18 of the lifting body 12.
- the forward end of the latch yoke 35 is in the shape of a clevis and is sized to receive a safety latch 40.
- the safety latch 40 extends downwardly through an opening 41 in the forward portion 14 and into a void 42 within the connecting member 16.
- the bottom tip 44 of the safety latch 40 is shaped to receive the anchor head 21 so that the anchor head is retained within the slot 20 when the lifting apparatus 10 is in the configuration shown in FIG. 3.
- the safety latch 40 is retained on the latch yoke 35 by a nut and bolt combination 45 and, due to the shape of the clevis end of the latch yoke, is prevented from pivoting relative to the latch yoke so that it remains substantially perpendicular to it.
- the release yoke 28 includes a bearing surface in the form of a nut and bolt combination 46 that is positioned directly below the shank of the latch yoke 35 when the lifting apparatus 10 is in the configuration shown in FIG. 3.
- a safety pin block 48 includes an upper channel-shaped portion 50 and a lower knuckle 52.
- the knuckle 52 includes a transverse bore 54 aligned with holes 58 formed in the legs 32, 33 of the rear portion 31. The holes receive a nut and bolt combination 56.
- the safety pin block 48 is oriented substantially perpendicularly to the rearward portion 31 and is maintained in that position by a roll pin 59 that extends through aligned holes 60 in legs 32, 33 and hole 61 in knuckle 52.
- the rearward end 62 of the latch yoke 35 includes a first bore 64 which, as shown in FIG. 3, is angled upwardly from the body of the latch yoke.
- the upper channel portion 50 of the safety pin block 48 includes a second bore 66 which is similarly angled and includes a pair of detent assemblies 68, 69.
- the detent assemblies 68, 69 each include a stainless steel detent ball 70 which is urged into the second bore 66 by a coil spring 72.
- the spring 72 and ball 70 are retained by a set screw 73 within detent holes 74 (one of which is shown) opening into the bore 66.
- a safety pin 76 is shaped to be inserted in the combined bore 75 and includes a circumferential groove 78 which is located along its shank to receive the end of the detent ball 70, thereby securing the safety pin within the bore.
- the safety pin is attached to a ring 80 which is attached to the end of a chain 82.
- the forward end of the chain 82 is attached to a loop 84 that is pivotally attached to a boss 86 by a nut and bolt combination 88.
- Boss 86 extends upwardly from the shoulder of the release yoke 28.
- a lanyard 90 is attached to the ring 80.
- the chain 82 is of sufficient length to hang loosely when the safety pin 76 is inserted into the combined bore 75 at the rearward end of the apparatus 10. Consequently, a pull of the lanyard 90 will first act to remove the safety pin 76 from the bore 75 before exerting a tensile force through the chain 82 to the release yoke 28.
- the operation of the lifting apparatus 10 is as follows. When attached to an anchor head 21 recessed within a concrete panel 24, the lifting apparatus 10 assumes the locked position shown in FIG. 3.
- the lifting body 12, rearward portion 31 of release yoke 28, and latch yoke 35 are all oriented substantially parallel to each other.
- the safety latch 40 of the latch yoke 35 retains the anchor head 21 within the slot 20 of the connection member 16, and the latch yoke is prevented from pivoting about 37 by the resilient force exerted by the spring 38, as well as by engagement of the bridge 34 with the top of the release yoke.
- the release yoke 28 is prevented from pivoting about 29 relative to the lifting body 12 by the engagement of the safety pin 76 in the bores 64, 66, so that the rearward portion 31 of the release yoke 28 is positively connected to the rearward end 62 of the latch yoke 35.
- This connection also prevents the release yoke 28 from pivoting relative to the lifting body 12.
- the locking engagement provided by the safety pin 76 is unaffected by variations in dimensional tolerances of the lifting body 12, release yoke 28, or latch yoke 35. Nor is the locking engagement affected by variations in locational tolerances of the pivot connections 29 and 37.
- the lanyard 90 When it is desired to release the apparatus 10 from the anchor 22, the lanyard 90 is pulled by the operator. The initial result of the tightening of the lanyard 90 is that the safety pin 76 is removed from the bore 75, which allows the release yoke 28 to move relative to the latch yoke 35 and pivot relative to the lifting body 12. Continued downward force on the lanyard 90 causes the release yoke 28 to pivot about 29 and rotate the spoon-shaped connecting member 16 such that the anchor head 21 is removed from engagement with the slot 20.
- the nut and bolt bearing 46 .[.urges.]. .Iadd.acts as a cam .Iaddend.against the underside of the latch yoke 35, causing it to pivot relative to the lifting body 12, thereby raising the safety latch 40 out of the void 42 to allow the anchor head 21 to .Iadd.disengage .Iaddend.completely .[.disengage.]. from the slot 20.
- the pivotal movement of the release yoke 28 will continue until the apparatus 10 assumes the configuration shown in FIG. 4, which is the release position. At that time, the entire apparatus will swing free of the panel 24.
- the prior art lifting apparatus generally designated 91 and shown in FIG. 1, includes a safety pin 76' which extends through a bore 92 formed in the boss 86' of the release yoke 28'.
- the safety latch 40' includes an upper extension 94 that includes a second bore 96, positioned to be in registry with the first bore 92 when the device 91 is in the locked position. Accordingly, the safety pin 76' extends through both bores 92, 96 and prevents relative movement between the release yoke 28' and the latch yoke 35'.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Emergency Lowering Means (AREA)
Abstract
Description
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/607,205 USRE33881E (en) | 1986-10-16 | 1990-10-30 | Apparatus for lifting concrete panels |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/920,103 US4700979A (en) | 1986-10-16 | 1986-10-16 | Apparatus for lifting concrete panels |
US40886589A | 1989-08-28 | 1989-08-28 | |
US07/607,205 USRE33881E (en) | 1986-10-16 | 1990-10-30 | Apparatus for lifting concrete panels |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/920,103 Reissue US4700979A (en) | 1986-10-16 | 1986-10-16 | Apparatus for lifting concrete panels |
US40886589A Continuation | 1986-10-16 | 1989-08-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE33881E true USRE33881E (en) | 1992-04-14 |
Family
ID=27410779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/607,205 Expired - Lifetime USRE33881E (en) | 1986-10-16 | 1990-10-30 | Apparatus for lifting concrete panels |
Country Status (1)
Country | Link |
---|---|
US (1) | USRE33881E (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6260900B1 (en) | 1999-03-29 | 2001-07-17 | Universal Form Clamp | Universal anchor for hoisting assembly |
US9988823B1 (en) | 2017-10-02 | 2018-06-05 | General Steel And Supply Company | Concrete forming system |
US10427916B1 (en) | 2018-10-05 | 2019-10-01 | Tgr Construction, Inc. | Structure installation system with vehicle having hangers to support a wall |
US10633812B1 (en) | 2019-06-25 | 2020-04-28 | Tgr Construction, Inc. | Bollard wall gate system |
US10633887B1 (en) | 2019-08-29 | 2020-04-28 | Tgr Construction, Inc. | Bollard setting and installation system |
US11105116B1 (en) | 2021-03-18 | 2021-08-31 | Tgr Construction, Inc. | Bollard wall system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2552387A1 (en) * | 1975-11-22 | 1977-05-26 | Haeussler Ernst | DEVICE FOR MANIPULATING PRECAST CONCRETE ELEMENTS |
DE2610195A1 (en) * | 1976-03-11 | 1977-09-22 | Haeussler Ernst | Prefabricated concrete component handling system - has lifting eye forming eccentric counterweight on slotted coupling piece for headed bolt |
US4173367A (en) * | 1977-03-01 | 1979-11-06 | Ernest Haeussler | Pickup unit for lifting concrete body |
US4368914A (en) * | 1981-01-12 | 1983-01-18 | Superior Concrete Accessories, Inc. | Pickup unit for releasable connection to a partially embedded member |
-
1990
- 1990-10-30 US US07/607,205 patent/USRE33881E/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2552387A1 (en) * | 1975-11-22 | 1977-05-26 | Haeussler Ernst | DEVICE FOR MANIPULATING PRECAST CONCRETE ELEMENTS |
DE2610195A1 (en) * | 1976-03-11 | 1977-09-22 | Haeussler Ernst | Prefabricated concrete component handling system - has lifting eye forming eccentric counterweight on slotted coupling piece for headed bolt |
US4173367A (en) * | 1977-03-01 | 1979-11-06 | Ernest Haeussler | Pickup unit for lifting concrete body |
US4368914A (en) * | 1981-01-12 | 1983-01-18 | Superior Concrete Accessories, Inc. | Pickup unit for releasable connection to a partially embedded member |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6260900B1 (en) | 1999-03-29 | 2001-07-17 | Universal Form Clamp | Universal anchor for hoisting assembly |
US9988823B1 (en) | 2017-10-02 | 2018-06-05 | General Steel And Supply Company | Concrete forming system |
US10655347B2 (en) | 2017-10-02 | 2020-05-19 | Tgr Construction, Inc. | Concrete forming system |
US10941580B2 (en) | 2017-10-02 | 2021-03-09 | Tgr Construction, Inc. | Concrete forming system |
US11702853B2 (en) | 2017-10-02 | 2023-07-18 | Tgr Construction, Inc. | Concrete forming system |
US10427916B1 (en) | 2018-10-05 | 2019-10-01 | Tgr Construction, Inc. | Structure installation system with vehicle having hangers to support a wall |
US10654689B2 (en) | 2018-10-05 | 2020-05-19 | Tgr Construction, Inc. | Structure installation system with vehicle having hangers to support a wall |
US11807498B2 (en) | 2018-10-05 | 2023-11-07 | Tgr Construction, Inc. | Structure installation system with vehicle having hangers to support a wall |
US11339032B2 (en) | 2018-10-05 | 2022-05-24 | Tgr Construction, Inc. | Structure installation system with vehicle having hangers to support a wall |
US11629470B2 (en) | 2019-06-25 | 2023-04-18 | Tgr Construction, Inc. | Bollard wall gate system |
US10633812B1 (en) | 2019-06-25 | 2020-04-28 | Tgr Construction, Inc. | Bollard wall gate system |
US10633887B1 (en) | 2019-08-29 | 2020-04-28 | Tgr Construction, Inc. | Bollard setting and installation system |
US11105117B2 (en) | 2019-08-29 | 2021-08-31 | Tgr Construction, Inc. | Bollard setting and installation system |
US11708705B2 (en) | 2019-08-29 | 2023-07-25 | Tgr Construction, Inc. | Bollard setting and installation system |
US11952795B2 (en) | 2019-08-29 | 2024-04-09 | Tgr Construction, Inc. | Bollard setting and installation system |
US11499339B2 (en) | 2021-03-18 | 2022-11-15 | Tgr Construction, Inc. | Bollard wall system |
US11105116B1 (en) | 2021-03-18 | 2021-08-31 | Tgr Construction, Inc. | Bollard wall system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4700979A (en) | Apparatus for lifting concrete panels | |
US4977647A (en) | Double locking snap hook | |
US4401333A (en) | Pelican hook | |
GB1570156A (en) | Suspension devices | |
US4422218A (en) | Lever-type load binder | |
US6832417B1 (en) | Safety snap hook | |
JPS59501794A (en) | releasable latching, coupling or supporting devices; | |
US5896630A (en) | Self locking snap hook | |
US5622399A (en) | Remote tie-off adaptor and snap hook attachment device | |
US7571944B2 (en) | Safety and rescue carabiner holder | |
US3008210A (en) | Safety crane hooks | |
USRE33881E (en) | Apparatus for lifting concrete panels | |
US4071263A (en) | Coupling hook for a three-point connection on a tractor | |
US5921699A (en) | Draw pin assembly | |
GB2398821A (en) | Workmen's safety devices for use with fixed track | |
US5033764A (en) | Locking trailer coupling | |
US7562919B2 (en) | Lifting eye releasing orientation apparatus with cable guiding feature | |
US5292163A (en) | Hook apparatus for lifting a heavy object | |
US4423610A (en) | Shackle lock | |
AU666230B2 (en) | Load-engaging device for hoisting concrete building elements | |
US3798716A (en) | Snap fastening device | |
EP2013132B1 (en) | Safety locking device for a lifting hook | |
JP4429052B2 (en) | Screw clamp | |
CN213175208U (en) | Simple and convenient suitable chain hooking device | |
JP3307896B2 (en) | Latch |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: BANK ONE, N.A., OHIO Free format text: SECURITY INTEREST;ASSIGNOR:DAYTON SUPERIOR CORPORATION;REEL/FRAME:008783/0319 Effective date: 19971029 |
|
AS | Assignment |
Owner name: BANKERS TRUST COMPANY, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:DAYTON SUPERIOR CORPORATION;REEL/FRAME:011044/0959 Effective date: 20000616 |
|
AS | Assignment |
Owner name: GENERAL ELECTRIC CAPITAL CORPORATION, NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNOR:DAYTON SUPERIOR CORPORATION;REEL/FRAME:014301/0075 Effective date: 20040130 |
|
AS | Assignment |
Owner name: BANK OF NEW YORK, THE, NEW YORK Free format text: SECURITY INTEREST AMENDMENT;ASSIGNOR:DAYTON SUPERIOR CORPORATION;REEL/FRAME:014943/0333 Effective date: 20040130 Owner name: BANK OF NEW YORK, THE, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:DAYTON SUPERIOR CORPORATION;REEL/FRAME:014920/0650 Effective date: 20040130 |
|
AS | Assignment |
Owner name: DAYTON SUPERIOR CORPORATION, OHIO Free format text: RELEASE OF SECURITY INTEREST IN PATENTS;ASSIGNOR:BANK ONE, N.A.;REEL/FRAME:020385/0292 Effective date: 20031205 |