GB1586128A - Gripping devices - Google Patents
Gripping devices Download PDFInfo
- Publication number
- GB1586128A GB1586128A GB53993/77A GB5399377A GB1586128A GB 1586128 A GB1586128 A GB 1586128A GB 53993/77 A GB53993/77 A GB 53993/77A GB 5399377 A GB5399377 A GB 5399377A GB 1586128 A GB1586128 A GB 1586128A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rings
- gripping elements
- gripping
- axis
- pair
- 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
Links
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Supports For Pipes And Cables (AREA)
- Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
- Prostheses (AREA)
- Surgical Instruments (AREA)
Description
(54) GRIPPING DEVICES
(71) We, INSTITUT FRANCAIS Du PETROLE, a body corporate organised and
existing under the laws of France, of 4
avenue de Bois-Preau, 92502 Rueil-Malmaison, France, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to gripping devices.
A known device for gripping an object comprises a plurality of gripping elements distributed at regular angular intervals around an axis of the device and displaceable with respect to the axis.
It will be assumed in the following, by way of example only, that the object to be gripped is an elongate member, such as a rod, a cable, or a pipe, and that the gripping elements are of the type comprising endless chains which carry gripping pads, for gripping and pulling the elongate member along the axis of the device, such as described, for example, in US Patent No.
3 866 882.
A first problem to be solved in such devices is td provide for synchronous gripping of the object by the different gripping elements. Another problem is to balance the forces applied by the gripping elements along the periphery of the object.
French Patent No. 2 213 890 discloses a device comprising means for synchronising displacement of the gripping elements towards and away from each other, these synchronising means consisting of an assembly of hinged rods. This prior device can only be embodied as a gripping device with two gripping elements.
According to the present invention there is provided a gripping device comprising a plurality of gripping elements located at regular angular intervals around an axis of the device and displaceable with respect to said axis, and means for synchronising displacement of said gripping elements towards and away from the axis, said synchronising means comprising at least one pair of rings centred on said axis in separate planes and connected to at least two gripping elements, each of the at least one pair of gripping elements comprising two linking rods articulated thereon, one of said linking rods being hinged on one ring of said pair and the other on the other ring of said pair, said two linking rods being positioned one on each side of a plane passing through the associated gripping element and said axis, so that any displacement of a first one of the at least one pair of gripping elements relative to said axis results in rotation of the two rings in opposite directions and in the simultaneous displacement of the other of the at least one pair of gripping elements.
Devices embodying the present invention can have any plural number of gripping elements distributed along and around the axis of the device.
In an embodiment of the device, all of the gripping elements can be connected to one another through a single pair of rings.
In another embodiment of the invention, comprising a plurality of pairs of rings, it is possible to interconnect at will the rings having the same direction of rotation when the gripping elements interconnected through said rings are simultaneously displaced. The rings are then advantageously distributed into two groups corresponding to the two directions of rotation, the rings of each group being positioned adjacent eah other so that they can be more easily interconnected.
Embodiments of the invention are illustrated, by way of example, in the accompanying drawings, wherein:
Figure 1 is an embodiment of the invention comprising two gripping elements;
Figure 2 is an exploded view of a device embodying the invention with four gripping elements; Figure 3 is a top view of means for synchronising the gripping elements in the embodiment of Figure 2;
Figure 4 is a detail cross section of'the syncronising means;
Figure 5 is a partial view, oniP larger scale, of the device illustrated Yn'1 "Figures 2 and 3;
Figure 6 is a detail view of means interconnecting rings of devices embodying the invention
Figure 6A is a sectional view along line
A of Figure 6; and
Figure 7 and Figure 8 illustrate devices embodying the invention comprising respectively three and six gripping elements.
Figure 1 illustrates a device for gripping and pulling an elongate member 1 (such as a rod, cable, or pipe) having an axis 2.
This device comprises a frame member 3 carrying two gripping elements 4 and 5 of the type having endless chains 6 provided with clamping pads (not shown). The endless chains 6 pass over toothed pinions, such as a driving pinion 7 and a direction reversing pinion 8. Gripping of the element 1 is achieved between two rectilinear portions of the chains 9 and 10, close to the axis 2.
The gripping elements 4 and 5 are displaceable with respect to the axis 2 by means of rollers 11 slidable along guiding paths such as 12 carried by the frame member 3. Displacement of the elements 4 and 5 so as to grip or, alternatively, to release the member 1 is achieved in a known manner by supplying pressurised fluid to one or the other side of the pistons of gripping jacks such as a jack 13 having one end 14 hinged on a flange 16, integral with a plate secured to the frame member 3 (plates 17 and 18), the other end 15 of these jacks being hinged on the gripping elements 4 or 5.
The gripping elements 4 and 5 comprise synchronising and balancing means formed by two systems 19 and 20 which are respectively carried by the plates 17 and 18.
Each of these systems, such as the system 19, comprises (Figure 2) at least one pair of annular members, such as rings 21a and 21b centred on the axis 2 of the device and defining a central bore 23 for the passage of the element 1.
In the embodiment illustrated in Figures 2 and 3, it is assumed that the device comprises four crosswise arranged gripping elements, i.e. it comprises, in addition to the elements 4 and 5 of Figure 1 with which are associated the rings 21a and 21b, two further gripping elements located in a plane perpendicular to the plane of the drawing and passing through the axis 2. With these two further gripping elements (not shown) is associated a pair of rings 22a and 22b.
The rings 21a, 21b, 22a and 22b are held in position by means of a sleeve member 24 integral with the plate 17, the rings being slidable (Figure 2) on the sleeve member with the provision of some clearance permitting their rotation about the axis 2 of the device.
The sleeve member 24 is provided with an annular shoulder 25 for forming an abutment for holding the rings 21a, 21b, 22a and 22b.
An annular cover 26 is secured by screws 27 to the end of the sleeve member 24 oppo
site to the annular shoulder 25.
Bearings 28 (such as ball, roller or needlebearings), which may be located for example between the ring 22b and the annular shoulder 25 and between the ring 22a and the cover 26, facilitate the rotation of the rings 21a, 21b, 22a and 22b about the axis 2 of the device.
Each gripping element comprises two rods hinged at 29 on crank levers 30 (Figure 1) of the gripping element, such as rods 31a and 31b for the gripping element 4 of Figure
1 and rods 32a and 32b for the gripping element 5.
These rods are hinged at 33 on diametrically arranged flanges 34a, 35a and 34b, 35b of the rings 2 lea and 21 b, as illustrated in
Figure 3, i.e. the two elements 4 and 5 forming a pair are interconnected through a pair of rings 21a and 21b and hinged rods 31a, 31b, 32a, 32b. The two rods, such as 31 a and 31 b, hinged on a single gripping element are also hinged on the rings 21a and the ring 21b respectively (Figure 2) and are located on both sides of a plane passing through the axis 2 of the device and through their point of articulation 29 on the gripping element (Figure 3).
Similarly, rods 36a, 36b and 37a, 37b (Figure 3) corresponding to the two other gripping elements, not shown in Figure 1, are hinged on these elements and respectively on flanges 38a, 39a of the ring 22a and on flanges 38b, 39b of the ring 22b.
Figure 4 is a view of a cross section along a plane passing through the axis 2 and the two flanges 39a and 35b when these flanges register with each other during the displacements of the gripping means.
With this arrangement the gripping elements 4 and 5 can be moved towards or away from the device axis 2, causing rotation of the rings 2la and 21b in opposite directions (the directions of rotation of these rings are indicated by arrows in Figure 2 for a displacement of the elements 4 and 5 from their position shown in dotted lines in
Figure 3).
Similarly, the two other gripping elements, located in a plane perpendicular to that of
Figure 1, are moved synchronously towards will those rings having the same direction of rotation during simultaneous displacement of the gripping elements connected through said rings.
4. A device according to claim 3, wherein the rings are distributed into two groups of rings in each of which the rings have the same direction of rotation, the rings of each group being positioned in a row so as to facilitate interconnection of the
and away from the axis 2 of the device, their
displacement towards the axis corresponding
to their gripping position causing rotation of
the rings 22a and 22b in opposite directions
(the directions of rotation are indicated by
arrows in Figure 2).
Perfect synchronisation of the displace
ments of the four gripping elements may be
achieved by securing to each other, on the
one hand, the rings 21 a and 22a which form
a first group A of rings having a first direc
tion of rotation and, on the other hand, the rings 21b and 22b which form a second group B of rings having a second direction
of rotation, opposite to the direction of rota
tion of the rings of group A (Figure 2).
This double connection is facilitated when,
in the stack of four rings shown in Figure
2, the rings 21a and 22a are superposed
and, similarly, the rings 21b and 22b are
superposed.
Securing to one another of the rings of
each group can then be achieved, as illu
strated in Figures 6 and 6A, by securing to
a shoulder 40 fast with a flange of one of
the rings (the flange 35a of the ring 21a, for
example) a stud or threaded rod 41 integral
with a locking wedge 43, which is slidable in
a slot 44 of the flange 35a carrying this stud
or threaded rod, and which can be inserted
by screwing a square head 42 of the rod 41
into slots 45 provided in two rings of the
same group.
Figure 6A shows the rings 21 a and 22a
of group A of Figure 2 prior to their assem
bling (the threaded rod 41 being unscrewed
and the wedge 43 not positioned in the slots
45 of the rings), while the rings 21b and 22b
of group B are already connected to each other (the rod 41 being screwed and the
wedge 43 positioned in the slots 45 of the
rings).
In Figures 7 and 8, which illustrate other embodiments, the same reference numerals as in the preceding figures of the drawings have been used to designate the same elements.
Figure 7 illustrates an embodiment with
three gripping elements, which can be used, in particular, for gripping objects of large
diameter.
This device, for example, makes use of
only two rings with opposite directions of
rotation, such as the rings 21a and 21b of
Figure 2, each of these rings having three flanges spaced by 1200 (flanges 47a, 48a and 49a for one of the rings and flanges 47b, 48b and 49b for the other ring).
Each gripping element is connected to the two rings by two linking rods (linking rods 50a, SOb; 51a, 51b; 52a, 52b).
In the case where high gripping forces must be exerted, one may use a device with six gripping elements which may consist of (Figure 8) three devices such as those of
Figures 2-6 with, as in Figures 2-6, a distribution of the rings into two groups, according to their direction of rotation, and optionally interconnection of the three rings of
each group.
Alternatively, a device with six gripping elements can be constituted by duplicating the device of Figure 7, thus only comprising four rings which can optionally be connected in pairs.
In both the embodiments of Figures 7 and 8, linking rods (53a, 53b; 54a, 54b; 55a, 55b; 56a, 56b; 57a, 57b and 58a, 58b) will connect the gripping elements to the
rings, in a similar manner as in the abovedescribed embodiments.
Generally speaking, when the device comprises an even number of gripping elements, it will be possible, for some applications, to
synchronise only half of the gripping elements.
By withdrawing from the slots 45 some of the locking wedges 43, it is possible to operate the device with only some of the locking elements, the withdrawal of all the locking wedges 43 making it even possible to operate the device without any synchronisation between its gripping elements, when
such a manner of operation if desired for
some applications.
WHAT WE CLAIM IS:
1. A gripping device comprising a plurality of gripping elements located at
regular angular intervals around an axis of
the device and displaceable with respect to
said axis, and means for synchronising displacement of said gripping elements towards
and away from the axis, said synchronising means comprising at least one pair of rings centred on said axis in separate planes and connected to at least two gripping elements, each of the at least one pair of gripping elements comprising two linking rods articulated thereon, one of said linking rods being hinged on one ring of said pair and
the other on the other ring of said pair, said two linking rods being positioned one on each side of a plane passing through the associated gripping element and said axis,
so that any displacement of a first one of the at least one pair of gripping elements relative to said axis results in rotation of the two rings in opposite directions and in the simultaneous displacement of the other of the at least one pair of gripping elements.
2. A device according to claim 1, wherein all of the gripping elements of the device can be interconnected through a single pair of rings.
3. A device according to claim 1, comprising a plurality of pairs of rings, each pair interconnecting at least two gripping elements, and means for interconnecting at
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (1)
- **WARNING** start of CLMS field may overlap end of DESC **.and away from the axis 2 of the device, their displacement towards the axis corresponding to their gripping position causing rotation of the rings 22a and 22b in opposite directions (the directions of rotation are indicated by arrows in Figure 2).Perfect synchronisation of the displace ments of the four gripping elements may be achieved by securing to each other, on the one hand, the rings 21 a and 22a which form a first group A of rings having a first direc tion of rotation and, on the other hand, the rings 21b and 22b which form a second group B of rings having a second direction of rotation, opposite to the direction of rota tion of the rings of group A (Figure 2).This double connection is facilitated when, in the stack of four rings shown in Figure 2, the rings 21a and 22a are superposed and, similarly, the rings 21b and 22b are superposed.Securing to one another of the rings of each group can then be achieved, as illu strated in Figures 6 and 6A, by securing to a shoulder 40 fast with a flange of one of the rings (the flange 35a of the ring 21a, for example) a stud or threaded rod 41 integral with a locking wedge 43, which is slidable in a slot 44 of the flange 35a carrying this stud or threaded rod, and which can be inserted by screwing a square head 42 of the rod 41 into slots 45 provided in two rings of the same group.Figure 6A shows the rings 21 a and 22a of group A of Figure 2 prior to their assem bling (the threaded rod 41 being unscrewed and the wedge 43 not positioned in the slots45 of the rings), while the rings 21b and 22b of group B are already connected to each other (the rod 41 being screwed and the wedge 43 positioned in the slots 45 of the rings).In Figures 7 and 8, which illustrate other embodiments, the same reference numerals as in the preceding figures of the drawings have been used to designate the same elements.Figure 7 illustrates an embodiment with three gripping elements, which can be used, in particular, for gripping objects of large diameter.This device, for example, makes use of only two rings with opposite directions of rotation, such as the rings 21a and 21b of Figure 2, each of these rings having three flanges spaced by 1200 (flanges 47a, 48a and 49a for one of the rings and flanges 47b, 48b and 49b for the other ring).Each gripping element is connected to the two rings by two linking rods (linking rods 50a, SOb; 51a, 51b; 52a, 52b).In the case where high gripping forces must be exerted, one may use a device with six gripping elements which may consist of (Figure 8) three devices such as those of Figures 2-6 with, as in Figures 2-6, a distribution of the rings into two groups, according to their direction of rotation, and optionally interconnection of the three rings of each group.Alternatively, a device with six gripping elements can be constituted by duplicating the device of Figure 7, thus only comprising four rings which can optionally be connected in pairs.In both the embodiments of Figures 7 and 8, linking rods (53a, 53b; 54a, 54b; 55a, 55b; 56a, 56b; 57a, 57b and 58a, 58b) will connect the gripping elements to the rings, in a similar manner as in the abovedescribed embodiments.Generally speaking, when the device comprises an even number of gripping elements, it will be possible, for some applications, to synchronise only half of the gripping elements.By withdrawing from the slots 45 some of the locking wedges 43, it is possible to operate the device with only some of the locking elements, the withdrawal of all the locking wedges 43 making it even possible to operate the device without any synchronisation between its gripping elements, when such a manner of operation if desired for some applications.WHAT WE CLAIM IS: 1. A gripping device comprising a plurality of gripping elements located at regular angular intervals around an axis of the device and displaceable with respect to said axis, and means for synchronising displacement of said gripping elements towards and away from the axis, said synchronising means comprising at least one pair of rings centred on said axis in separate planes and connected to at least two gripping elements, each of the at least one pair of gripping elements comprising two linking rods articulated thereon, one of said linking rods being hinged on one ring of said pair and the other on the other ring of said pair, said two linking rods being positioned one on each side of a plane passing through the associated gripping element and said axis, so that any displacement of a first one of the at least one pair of gripping elements relative to said axis results in rotation of the two rings in opposite directions and in the simultaneous displacement of the other of the at least one pair of gripping elements.2. A device according to claim 1, wherein all of the gripping elements of the device can be interconnected through a single pair of rings.3. A device according to claim 1, comprising a plurality of pairs of rings, each pair interconnecting at least two gripping elements, and means for interconnecting atrings.5. A gripping device substantially as herein described with reference to Figure 1, Figures 2 to 6A, Figure 7 or Figure 8 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7639293A FR2375957A1 (en) | 1976-12-28 | 1976-12-28 | PERFECTED CLAMPING DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1586128A true GB1586128A (en) | 1981-03-18 |
Family
ID=9181628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB53993/77A Expired GB1586128A (en) | 1976-12-28 | 1977-12-28 | Gripping devices |
Country Status (6)
| Country | Link |
|---|---|
| DE (1) | DE2758367A1 (en) |
| FR (1) | FR2375957A1 (en) |
| GB (1) | GB1586128A (en) |
| IT (1) | IT1089091B (en) |
| NL (1) | NL7714288A (en) |
| NO (1) | NO774443L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993023233A1 (en) * | 1992-05-15 | 1993-11-25 | Delaware Capital Formation, Inc. | Apparatus for adjustment of the spacing of film drive assemblies in a tubular film forming device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4366606A (en) * | 1980-08-29 | 1983-01-04 | Walker-Neer Mfg. Co., Inc. | Self-centering clamp for down-hole tubulars |
-
1976
- 1976-12-28 FR FR7639293A patent/FR2375957A1/en active Granted
-
1977
- 1977-12-22 NL NL7714288A patent/NL7714288A/en not_active Application Discontinuation
- 1977-12-23 NO NO774443A patent/NO774443L/en unknown
- 1977-12-27 IT IT31282/77A patent/IT1089091B/en active
- 1977-12-28 DE DE19772758367 patent/DE2758367A1/en not_active Withdrawn
- 1977-12-28 GB GB53993/77A patent/GB1586128A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993023233A1 (en) * | 1992-05-15 | 1993-11-25 | Delaware Capital Formation, Inc. | Apparatus for adjustment of the spacing of film drive assemblies in a tubular film forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7714288A (en) | 1978-06-30 |
| FR2375957A1 (en) | 1978-07-28 |
| FR2375957B1 (en) | 1980-09-26 |
| DE2758367A1 (en) | 1978-06-29 |
| NO774443L (en) | 1978-06-29 |
| IT1089091B (en) | 1985-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |