CA2100871A1 - Lifting pin and system - Google Patents
Lifting pin and systemInfo
- Publication number
- CA2100871A1 CA2100871A1 CA 2100871 CA2100871A CA2100871A1 CA 2100871 A1 CA2100871 A1 CA 2100871A1 CA 2100871 CA2100871 CA 2100871 CA 2100871 A CA2100871 A CA 2100871A CA 2100871 A1 CA2100871 A1 CA 2100871A1
- Authority
- CA
- Canada
- Prior art keywords
- pin
- socket
- head
- lifting
- threads
- 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.)
- Abandoned
Links
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
-
- 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
- E04G21/142—Means in or on the elements for connecting same to handling apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Lining And Supports For Tunnels (AREA)
- Paper (AREA)
Abstract
A lifting pin (10) has a lifting head (11) and a threaded shank (16), the shank being received in the threaded portion (25) of a socket (20) formed in the concrete body (21) to be lifted.
Description
WO93/10321 ~ i3 ~1 ~ P, ~ PCT/GB92/0215~
LIFTING PI~ AND SYST~.~1 The invention relates to a lifting pin and more ~articul~rly to a system of lifting a heavy object such as a ^oncrete body to be placed in an intended location. One specifi_ use in which the invention is seen to good effect is in th~ placement of segments to build up a tunnel lining. ~or convenience the inven~ion will be described with reference to that particular use that tns invention is not to be limited therebv.
It is known to cast a threaded soc~et in a concrste segment and to locate a threaded pin in that socket. The pin com~rises a shank which is received in the socket and a head which can be engaged by the end of an articulated arm mounted on a crane or th li]ce by which the concrete segment can be li~ted into place.
The ~rm is disengaged following which the pin is removed and then grout can be pumped through the socket to fill ~ space behind the segment, e.g. the annulus between the tunnel lining and the tunnel bore wall. Unfortunately, this method of lifting is `~
unreliable because the pin can unthread itself from the lifting mechanism especially when the concrete segment tends to rotate.
Clearly this has safety implications.
'~`:
It is one object of this invention to provide a system for lifting which is of im~roved security and has other advantages.
WO93/10321 Q ~ PCT/GB92/0215~
Accor~ing to the invention in one aspect there is provided a method of lifting a concrete body for placement, e.g. as a segment of a tunnel lining, the method comprising ~i) engaging a lifting pin in a threaded socket therefor in the body, the 2in having a head and a threaded shank, the socket and the pin having complementary threads shaped to cause the pin to interengage with ~he socket so as to enable the pin to engage the body for lifting and the threads of the pin being shaped to ?reven~
unintentional threading of the pin from the socket;
: .
(ii) engaging the head of the pin with a lifting device and then moving the body to the intended place, separating the lifting device from the pin and , (iii) releasing the pin from the socket.
Preferably the threads of the threaded portion comprise sloping side walls, one of which is relatively steeper and longer than the other. The threads are preferably arranged so that the lead in face of each thread, i.e. the one which leads into the socket, is the shorter and steeper and so presents minimal resistance whereas the trailing face presents are larger area for the subsequent unthreading. Preferably the faces are inclined so ., .
:~,. , : .
, ..... !;, ' .
': . " ' ' ' ' ' ' , WO93/10321 ~ ~ PCT/GB92/021~
that the pressure generated at the trailing face is about three times as great as at the leading face. Preferably the threads are in a helix. Preferably the threads are shaped so that there is a three point start for speed of insertion of the pin in the socket. The shan~ may include a frustoconical portion between the threaded portion and the head of the pin to engage with a complementary portion of the body.
~he threaded socket is pre'erably formed of ~ylon or like plastic and has side flanges to anchor the soc~e_ in the concre~e bodv.
~hen the socket is cast in the concrete body, the concrete will fill the space behind the threads so providing deep tapered shoulders of set concrete. As a result of the interengagement of the threads of the pin and those of the socket and the concrete shoulders behind those socket threads, the pin can be used to lift a heavy concrete body. A pin of the invention can be used to lift a heavy concrete body and the socket can be use~ for other purposes, e.g. grouting.
The hsad of the pin may be generally spherical and have sockets to receive a bar used to rotate the pin out of the socket.
' Most preferably the method of lifting includes the step of locating the hood of a lifting means over the head of the pin, the hood containing a clamping device actuable to engage the head of the pin, and engaging the clamoing device with the pin.
.`, '.
: ' .' ' , . .. ', , ' ' . ~ ~ . ' ' WO93/10321 PCT/GB92/0~15~
n ~
Preferably the clamping device comprises an upper bulb like body surrounded by a plurality of segmental fingers, the lower ?ortion of the fingers being shaped to engage the head of the pin, and actuating cam means to urge the fingers to engage the head of the pin. Preferably the method includes the step of actuating the c~m means from outside the hood.
In another aspect the invention provides a lifting pin comprising a head and a shank, the shank having a threaded portion, the threads being arranged in a helical path, the walls of the threads being shaped to prevent unintentional unthreading from a socket for the threaded shank and each having a relatively staep lead in anglsd face and a relatively shallow trailing angled face and the head of the pin being shaped for lifting.
In order that the invention may be well understood it will now be described with reference to the accompanying diagrammatic drawings, in which ~igure 1 is a side elevation of one embodiment of a lifting pin according to the invention overlying and partly in a socket therefor set in a concrete segment;
Figure 2A is an elevation partly in section of a lifting device about to engage-the pin of Figure 1 and Figure 2B is a sectional view taken along lines II-II on Figure 2A;
... . ............. . . . .
' ............. '; ~ -. ' :
,, ' , , :
W093/1032] ~ 3~ ~ PCT/GB92/0215 ~igure 3A corresponds to ~igure 2A showing the device in clasping engagement -~ith the ~in and Figure 3B is a sectional ~Jiew taken along lines III-III on Figure 3A; and r igure 4A is a plan view and ~igure 43 a vertical section of a plug used to seal the socket shown in ~igure 1.
The lifting pin 10 comprises an elongate steel ~ody comprising a spherical head 11 on top o a neck 12 mounted on an annulus 13 h ving side flats 14. The pin may be made in any convenient way, for example by being machined from a length of bar. Below the annulus is a frustoconical ~ortion 15 beneath -~hich is a helically threaded shank 16. The threading is of helical form, each thread 17 comprising one relatively longer side wall 17A and one relatively shorter sidewall 17B. The ratio of the side walls may be selected so that there is a steep lead-in angle (side wall 17B) and a relatively shallower trailing angle (side wall 17A);
the ratio may be about 3:l. The thread is a three point start for speed of insertion into a socket 20.
The socket 20 is cast in the body of concrete 21. The socket 20 has a conical base portion 22 having an annular anchoring rim 23 at the lower face 21B of the concrete body. The top portion 24 of the socket is funnel shaped, having an annular rim 24A set in the upper face 21A of the body 21. The intermediate portion 25 ::
.
WO93/10321 PCT/GB92/0215' ~ ~`.'3 7 l6 of the socket 21 is threaded in a helix to complement that of the shank 16 of the pin 10. Because the socket 21 is cast in the concrete shoulders of set concrete are present behind the threads of the socket. The socket 20 is made of 2mm nominal thickness in plastics such as NYLON.
In use, to lift the body 21 the pin 10 is threaded into the socket 20, the shape of the threads o' the helix serving to engage the par.s together and ~o locc them against unintenlional unth~eading. The body may then be lifted using the lifting device 30 shown in Figures 2 and 3. Becaus2 of the engagement of the threads of the shank and those of the socket and the concrete behind, the pin may be used to li't a heavy concrete body. The device comprises a hood 31 having a cen~ral socket 32 in the roof thereof for connection to an articulated limb or crane chain, neither of which is shown. -A bulb-like body 33 depends from the centre of the hood and is surrounded by a plurality of segmental 'ingers 34. The inner walls of the fingers 34 have up?er and lower arcuate portions 35 adapted to engage the bulb body 33 and the head 11 of the pin 10 respectively. The outer surface of the fingers has a depression 36 at a position about 2/3 of the height. Opposite cam members 37 are present along the side walls of the hood 30, and can be moved vertically by bars 38 projecting beyond the hood and travelling in slots therefor. The slots are inclined along a helical path. When the cam members 37 are lowered from the raised condition shown in Figure 2 to the .. . . ... .. .
: .
:.
, .
, , WO93/10321 h ~ PCT/GB92/021~
lowered condition shown in Figure 3 the fingers are brought together so that they engage the head 11 of the pin 10, the free ends 39 of the fingers resting against the ~all of the nec3c 12.
In this condition the concrete body 21 may be lifted, with confidence that the pin 11 is securely clamped to the lifting device 30 and is also held secure against any movement (axial or torsional) relative to the socket 30. After placement, t~e flngers 34 of the clamping device 30 are released from the head 11 of the pin 10 and the pin 10 is then unthreaded.
plastics plug 40 shown in Figure 4 is then threaded into the socket 20, the plug corresponding in shape to the inte ior or the socket. The plug has a bore 41 and a blind end wall 42. T}le plug is used to block the socket 20 after pumping of grout behln~
the placed segment. The mouth of the plug may then be sealed.
, :
The invention is not limited to the embodiment shown. The socket may comprise the threaded portion only and may not ex_en~ the full thi.ckness of the body. One more sockets may be present per body but usually only one is needed. The plug may be serrate~ to destroy the socket. The body need not be a segment and may not ..., : ,..
be formed of concrete.
LIFTING PI~ AND SYST~.~1 The invention relates to a lifting pin and more ~articul~rly to a system of lifting a heavy object such as a ^oncrete body to be placed in an intended location. One specifi_ use in which the invention is seen to good effect is in th~ placement of segments to build up a tunnel lining. ~or convenience the inven~ion will be described with reference to that particular use that tns invention is not to be limited therebv.
It is known to cast a threaded soc~et in a concrste segment and to locate a threaded pin in that socket. The pin com~rises a shank which is received in the socket and a head which can be engaged by the end of an articulated arm mounted on a crane or th li]ce by which the concrete segment can be li~ted into place.
The ~rm is disengaged following which the pin is removed and then grout can be pumped through the socket to fill ~ space behind the segment, e.g. the annulus between the tunnel lining and the tunnel bore wall. Unfortunately, this method of lifting is `~
unreliable because the pin can unthread itself from the lifting mechanism especially when the concrete segment tends to rotate.
Clearly this has safety implications.
'~`:
It is one object of this invention to provide a system for lifting which is of im~roved security and has other advantages.
WO93/10321 Q ~ PCT/GB92/0215~
Accor~ing to the invention in one aspect there is provided a method of lifting a concrete body for placement, e.g. as a segment of a tunnel lining, the method comprising ~i) engaging a lifting pin in a threaded socket therefor in the body, the 2in having a head and a threaded shank, the socket and the pin having complementary threads shaped to cause the pin to interengage with ~he socket so as to enable the pin to engage the body for lifting and the threads of the pin being shaped to ?reven~
unintentional threading of the pin from the socket;
: .
(ii) engaging the head of the pin with a lifting device and then moving the body to the intended place, separating the lifting device from the pin and , (iii) releasing the pin from the socket.
Preferably the threads of the threaded portion comprise sloping side walls, one of which is relatively steeper and longer than the other. The threads are preferably arranged so that the lead in face of each thread, i.e. the one which leads into the socket, is the shorter and steeper and so presents minimal resistance whereas the trailing face presents are larger area for the subsequent unthreading. Preferably the faces are inclined so ., .
:~,. , : .
, ..... !;, ' .
': . " ' ' ' ' ' ' , WO93/10321 ~ ~ PCT/GB92/021~
that the pressure generated at the trailing face is about three times as great as at the leading face. Preferably the threads are in a helix. Preferably the threads are shaped so that there is a three point start for speed of insertion of the pin in the socket. The shan~ may include a frustoconical portion between the threaded portion and the head of the pin to engage with a complementary portion of the body.
~he threaded socket is pre'erably formed of ~ylon or like plastic and has side flanges to anchor the soc~e_ in the concre~e bodv.
~hen the socket is cast in the concrete body, the concrete will fill the space behind the threads so providing deep tapered shoulders of set concrete. As a result of the interengagement of the threads of the pin and those of the socket and the concrete shoulders behind those socket threads, the pin can be used to lift a heavy concrete body. A pin of the invention can be used to lift a heavy concrete body and the socket can be use~ for other purposes, e.g. grouting.
The hsad of the pin may be generally spherical and have sockets to receive a bar used to rotate the pin out of the socket.
' Most preferably the method of lifting includes the step of locating the hood of a lifting means over the head of the pin, the hood containing a clamping device actuable to engage the head of the pin, and engaging the clamoing device with the pin.
.`, '.
: ' .' ' , . .. ', , ' ' . ~ ~ . ' ' WO93/10321 PCT/GB92/0~15~
n ~
Preferably the clamping device comprises an upper bulb like body surrounded by a plurality of segmental fingers, the lower ?ortion of the fingers being shaped to engage the head of the pin, and actuating cam means to urge the fingers to engage the head of the pin. Preferably the method includes the step of actuating the c~m means from outside the hood.
In another aspect the invention provides a lifting pin comprising a head and a shank, the shank having a threaded portion, the threads being arranged in a helical path, the walls of the threads being shaped to prevent unintentional unthreading from a socket for the threaded shank and each having a relatively staep lead in anglsd face and a relatively shallow trailing angled face and the head of the pin being shaped for lifting.
In order that the invention may be well understood it will now be described with reference to the accompanying diagrammatic drawings, in which ~igure 1 is a side elevation of one embodiment of a lifting pin according to the invention overlying and partly in a socket therefor set in a concrete segment;
Figure 2A is an elevation partly in section of a lifting device about to engage-the pin of Figure 1 and Figure 2B is a sectional view taken along lines II-II on Figure 2A;
... . ............. . . . .
' ............. '; ~ -. ' :
,, ' , , :
W093/1032] ~ 3~ ~ PCT/GB92/0215 ~igure 3A corresponds to ~igure 2A showing the device in clasping engagement -~ith the ~in and Figure 3B is a sectional ~Jiew taken along lines III-III on Figure 3A; and r igure 4A is a plan view and ~igure 43 a vertical section of a plug used to seal the socket shown in ~igure 1.
The lifting pin 10 comprises an elongate steel ~ody comprising a spherical head 11 on top o a neck 12 mounted on an annulus 13 h ving side flats 14. The pin may be made in any convenient way, for example by being machined from a length of bar. Below the annulus is a frustoconical ~ortion 15 beneath -~hich is a helically threaded shank 16. The threading is of helical form, each thread 17 comprising one relatively longer side wall 17A and one relatively shorter sidewall 17B. The ratio of the side walls may be selected so that there is a steep lead-in angle (side wall 17B) and a relatively shallower trailing angle (side wall 17A);
the ratio may be about 3:l. The thread is a three point start for speed of insertion into a socket 20.
The socket 20 is cast in the body of concrete 21. The socket 20 has a conical base portion 22 having an annular anchoring rim 23 at the lower face 21B of the concrete body. The top portion 24 of the socket is funnel shaped, having an annular rim 24A set in the upper face 21A of the body 21. The intermediate portion 25 ::
.
WO93/10321 PCT/GB92/0215' ~ ~`.'3 7 l6 of the socket 21 is threaded in a helix to complement that of the shank 16 of the pin 10. Because the socket 21 is cast in the concrete shoulders of set concrete are present behind the threads of the socket. The socket 20 is made of 2mm nominal thickness in plastics such as NYLON.
In use, to lift the body 21 the pin 10 is threaded into the socket 20, the shape of the threads o' the helix serving to engage the par.s together and ~o locc them against unintenlional unth~eading. The body may then be lifted using the lifting device 30 shown in Figures 2 and 3. Becaus2 of the engagement of the threads of the shank and those of the socket and the concrete behind, the pin may be used to li't a heavy concrete body. The device comprises a hood 31 having a cen~ral socket 32 in the roof thereof for connection to an articulated limb or crane chain, neither of which is shown. -A bulb-like body 33 depends from the centre of the hood and is surrounded by a plurality of segmental 'ingers 34. The inner walls of the fingers 34 have up?er and lower arcuate portions 35 adapted to engage the bulb body 33 and the head 11 of the pin 10 respectively. The outer surface of the fingers has a depression 36 at a position about 2/3 of the height. Opposite cam members 37 are present along the side walls of the hood 30, and can be moved vertically by bars 38 projecting beyond the hood and travelling in slots therefor. The slots are inclined along a helical path. When the cam members 37 are lowered from the raised condition shown in Figure 2 to the .. . . ... .. .
: .
:.
, .
, , WO93/10321 h ~ PCT/GB92/021~
lowered condition shown in Figure 3 the fingers are brought together so that they engage the head 11 of the pin 10, the free ends 39 of the fingers resting against the ~all of the nec3c 12.
In this condition the concrete body 21 may be lifted, with confidence that the pin 11 is securely clamped to the lifting device 30 and is also held secure against any movement (axial or torsional) relative to the socket 30. After placement, t~e flngers 34 of the clamping device 30 are released from the head 11 of the pin 10 and the pin 10 is then unthreaded.
plastics plug 40 shown in Figure 4 is then threaded into the socket 20, the plug corresponding in shape to the inte ior or the socket. The plug has a bore 41 and a blind end wall 42. T}le plug is used to block the socket 20 after pumping of grout behln~
the placed segment. The mouth of the plug may then be sealed.
, :
The invention is not limited to the embodiment shown. The socket may comprise the threaded portion only and may not ex_en~ the full thi.ckness of the body. One more sockets may be present per body but usually only one is needed. The plug may be serrate~ to destroy the socket. The body need not be a segment and may not ..., : ,..
be formed of concrete.
Claims (15)
1. A method of lifting a concrete body (21) for placement, e.g.
as a segment of a tunnel lining, the method comprising (i) engaging a lifting pin (10) in a threaded socket therefor (20) in the body (21), the pin (10) having a head (11) and a threaded shank (16), the socket (20) and the pin (10) having complementary threads (25,16) shaped to cause the pin (10) to interengage with the socket (20) so as to enable the pin (10) to engage the body (21) for lifting and the threads (17) of the pin (10) being shaped to prevent unintentional threading of the pin (10) from the socket (20);
(ii) engaging the head (11) of the pin (10) with a lifting device (30) and then moving the body (21) to the intended place, separating the lifting device from the pin (10) and (iii) releasing the pin (10) from the socket (20).
as a segment of a tunnel lining, the method comprising (i) engaging a lifting pin (10) in a threaded socket therefor (20) in the body (21), the pin (10) having a head (11) and a threaded shank (16), the socket (20) and the pin (10) having complementary threads (25,16) shaped to cause the pin (10) to interengage with the socket (20) so as to enable the pin (10) to engage the body (21) for lifting and the threads (17) of the pin (10) being shaped to prevent unintentional threading of the pin (10) from the socket (20);
(ii) engaging the head (11) of the pin (10) with a lifting device (30) and then moving the body (21) to the intended place, separating the lifting device from the pin (10) and (iii) releasing the pin (10) from the socket (20).
2. A method according to Claim 1, wherein the threads (17) of the threaded portion (16) each comprise sloping side walls, one of which is relatively steeper (17A) and longer than the other (17B).
3. A method according to Claim 1 or 2, wherein the walls of the threads (17A,17B) are shaped so that the pressure generated at the trailing face (17B) is about three times as great as at the lead in face (17A).
4. A method according to Claim 1,2 or 3, wherein the threads are in a helix and include a three point start.
5. A method according to Claim 1, 2, 3 or 4 wherein the threaded socket (20) is formed of plastic and has side flanges (23) to anchor the socket (20) in the concrete body (21).
6. A method according to Claim 5, wherein the socket (30) is cast into the body (21) so that concrete shoulders are formed in the threaded portion (25).
7. A method according to any preceding Claim, wherein the shank (16) of the pin (10) includes a frustoconical portion (15) between the threaded portion (16) and the head (11) of the pin (10).
8. A method according to Claim 7, wherein the head (11) of the pin (10) is mounted on a neck portion (12).
9. A method according to any preceding Claim including the step of locating the hood (31) of the lifting means (30) over the head (11) of the pin (10), the hood (31) containing a clamping device (33) actuable to engage the head (11) of the pin (10), and engaging the clamping device (33) to the pin (10) .
10. A method according to Claim 9, wherein the clamping device (33) comprises an upper bulb like body (33) surrounded by a plurality of segmental fingers (34), the lower portion (35) of the fingers (34) being shaped to engage the head (11) of the pin (10), and actuating cam means (37) to urge the fingers (34) to engage the head (11) of the pin (10).
11. A method according to Claim 10, including actuating the cam means (38) from outside the hood (30).
12. A lifting pin (10) comprising a head (11) and a shank (16), the shank (16) having a threaded portion, the threads (17) being arranged in a helical path, the walls (17A,17B) of the threads being shaped to prevent unintentional unthreading from a socket (20) for the threaded shank (16) and the head (11) being shaped for lifting.
13. A pin according to Claim 12, wherein the threading includes a three point start.
14. A pin according to Claim 12 or 13, including a frustoconical portion (15) between the head (11) and the threaded portion (16) of the shank.
15. A pin according to any of Claims 12 to 14, wherein the head (11) of the pin is spherical and is connected by a neck portion (12) to the shank (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9124780A GB2261650A (en) | 1991-11-21 | 1991-11-21 | Lifting pin |
| GB9124780.9 | 1991-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2100871A1 true CA2100871A1 (en) | 1993-05-22 |
Family
ID=10705022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2100871 Abandoned CA2100871A1 (en) | 1991-11-21 | 1992-11-20 | Lifting pin and system |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0568677A1 (en) |
| AU (1) | AU655337B2 (en) |
| CA (1) | CA2100871A1 (en) |
| FI (1) | FI933271A0 (en) |
| GB (2) | GB2261650A (en) |
| WO (1) | WO1993010321A1 (en) |
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| ATE267139T1 (en) * | 1999-10-07 | 2004-06-15 | Martin Thompson | LID AND LIFTING DEVICE THEREOF |
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| GB2583459B (en) * | 2019-04-05 | 2023-01-18 | Berkeley Modular Ltd | Post connector |
| GB2586023B (en) * | 2019-07-29 | 2023-08-02 | S C H Site Services Ltd | Lifting Interface |
| DE102020201341A1 (en) | 2020-02-04 | 2021-08-05 | Zf Friedrichshafen Ag | Method for grasping and moving in a lifting direction a component having a protruding socket by means of a lifting tool and a lifting tool with a plurality of gripping elements for grasping and moving in a lifting direction a component having a projecting socket |
| US11761560B2 (en) | 2020-02-19 | 2023-09-19 | Conxtech, Inc. | Modular pipe rack system |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB484261A (en) * | 1937-07-05 | 1938-05-03 | Traylor Engineering & Mfg Comp | Improvements in and relating to suspension means for crusher shafts of gyratory crushers |
| GB512307A (en) * | 1939-03-01 | 1939-08-31 | Holman Brothers Ltd | Improvements in or relating to screw and nut elements |
| CH431021A (en) * | 1963-06-19 | 1967-02-28 | Kaemper Hans | Support anchor with screw-in fastening bolt for the transport of concrete parts |
| US3433117A (en) * | 1967-06-05 | 1969-03-18 | Standard Pressed Steel Co | High fatigue bolt thread |
| FR1599500A (en) * | 1968-01-31 | 1970-07-15 | ||
| US3943817A (en) * | 1974-11-25 | 1976-03-16 | The Dayton Sure-Grip & Shore Company | Split bolt |
| CA1051329A (en) * | 1975-10-08 | 1979-03-27 | Horace D. Holmes | Locking thread construction |
| US4273175A (en) * | 1979-04-04 | 1981-06-16 | The Lamson & Sessions Co. | Thread convolution |
| US4351626A (en) * | 1980-04-18 | 1982-09-28 | Holmes Horace D | Self-locking threaded fastener |
| DE8321596U1 (en) * | 1983-07-27 | 1983-11-24 | Deha-Baubedarf Gmbh & Co Kg, 6080 Gross-Gerau | SCREW-IN CONNECTOR FOR SLEEVE ANCHORS CONCRETED IN A PRECAST CONCRETE PART |
| DE4013228C1 (en) * | 1990-04-26 | 1991-06-27 | Man Roland Druckmaschinen Ag, 6050 Offenbach, De |
-
1991
- 1991-11-21 GB GB9124780A patent/GB2261650A/en not_active Withdrawn
-
1992
- 1992-11-20 WO PCT/GB1992/002155 patent/WO1993010321A1/en not_active Application Discontinuation
- 1992-11-20 CA CA 2100871 patent/CA2100871A1/en not_active Abandoned
- 1992-11-20 AU AU29501/92A patent/AU655337B2/en not_active Ceased
- 1992-11-20 EP EP19920923890 patent/EP0568677A1/en not_active Withdrawn
- 1992-11-20 GB GB9224376A patent/GB2261651B/en not_active Expired - Fee Related
-
1993
- 1993-07-20 FI FI933271A patent/FI933271A0/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2261651A (en) | 1993-05-26 |
| GB2261650A (en) | 1993-05-26 |
| GB9224376D0 (en) | 1993-01-13 |
| AU2950192A (en) | 1993-06-15 |
| AU655337B2 (en) | 1994-12-15 |
| GB2261651B (en) | 1995-01-11 |
| WO1993010321A1 (en) | 1993-05-27 |
| FI933271A (en) | 1993-07-20 |
| FI933271A0 (en) | 1993-07-20 |
| GB9124780D0 (en) | 1992-01-15 |
| EP0568677A1 (en) | 1993-11-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |