GB1603025A - Self-locking adjustabel support devices and adjustable self-locking mechanisms for use therewith - Google Patents
Self-locking adjustabel support devices and adjustable self-locking mechanisms for use therewith Download PDFInfo
- Publication number
- GB1603025A GB1603025A GB1299378A GB1299378A GB1603025A GB 1603025 A GB1603025 A GB 1603025A GB 1299378 A GB1299378 A GB 1299378A GB 1299378 A GB1299378 A GB 1299378A GB 1603025 A GB1603025 A GB 1603025A
- Authority
- GB
- United Kingdom
- Prior art keywords
- support device
- housing
- telescopically interfitting
- locking
- locking elements
- 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
- 230000007246 mechanism Effects 0.000 title claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003518 caustics Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Description
(54) SELF-LOCKING ADJUSTABLE SUPPORT DEVICES
AND ADJUSTABLE SELF-LOCKING MECHANISMS
FOR USE THEREWITH
(71) We, ALFRYN IEUAN JOHN, a British subject, of 3 Waubant Road, Kenfig Hill,
Glamorgan, and JACK HENRY MOXHAM, a
British subject, of 11 Hogarth Place, Aberavon, Port Talbot, West Glamorgan, 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 self-locking adjustable support devices and more particularly, but not exclusively, to self-locking adjustable props for use in mines, on building sites, in trenches and in similar applications, and to adjustable self-locking mechanisms for use with such devices.
The invention constitutes a devlopment, modification and further refinement of the invention described and claimed in our
United Kingdom Patent No. 1 552223 and has for an object, to combine the self-locking mechanism and the final and fine adjustment of the overall length of the support device disclosed therein whereby to facilitate initial striking of the supporting device closely to approximate the desired overall length and subsequent final adjustment thereof to that desired overall length by a single operator by means of an adjustment mechanism adapted to be located at a convenient position along the length of the support device.
Other objects of the invention are to provide a support device of the afore-mentioned type which may utilize standard commerically available tubes, such as scaffold tubes; which is of relatively simple construction; and which utilizes a minimum number of components all of which may be securely, though detachably, interconnected upon assembly of the support device, the whole being designed for rugged service and to provide maximum protection against ingress or dirt, moisture and other corrosive agents.
The invention also has for an object to provide a self-locking support device which can be easily adjusted to approximately the desired overall length and thereafter finally adjusted to that the length in a quick simple and convenient manner by a single operator, permitting fast installation and removal of the support device.
Another object of the invention is to provide a self-locking adjustable support device which is infinitely adjustable between predetermined limits and which upon application of a load thereto is automatically locked at the length to which it has been set, rendering it fail-safe in operation since within the predetermined load-bearing capacity of the support device the locking mechanism cannot be accidentally released whilst the support device is under load.
A further object of the invention is to provide an adjustable self-locking mechanism which may be readily and, if desired, detachably mounted on one of a par of telescopically interfitting members, constituting elements of a support device, in a manner permitting final adjustment of the overall length of the support device and in a manner to interlock said members against movement in a longitudinal direction relative to one another.
According to one aspect of the present invention there is provided a self-locking adjustable support device comprising two telescopically interfitting members, a housing, means connecting the housing to one end of one of said telescopically interfitting members in a manner permitting the housing to be adjusted in position longitudinally relative to said one member, said housing being formed with a portion having an internal frusto-conical surface, said connecting means permitting rotation of said housing relative to said one member about its longitudinal axis to permit adjustment of the overall length of the support device, a cover member arranged to circumjace the free end of said housing and having a plurality of locking elements depending therefrom into a space defined between said internal frustoconical surface of said housing and the outer surface of said other one of said telescopically interfitting members, and resilient means disposed within said cover member and normally effective to bias said cover member towards said one member and to bias said locking elements to positions within said housing whereat they are in gripping engagement with said other one of said telescopically interfitting members so as to inhibit movement of said other member in one direction longitudinally relative to said one member.
According to another aspect of the invention there is provided an adjustableself- locking mechanism for use in association with a support device having two telescopically interfitting members, said mechanism comprising a housing arranged to be connected to one end of the outer one of said telescopically interfitting members in a manner permitting said housing to be adjusted in position longitudinally relative to the other of said members to permit adjustment of the overall length of the support device, said housing having a portion defining an internal frusto-conical surface, a cover member arranged to circumjace the portion of the housing defining the internal frusto-conical surface, a plurality of locking elements depending from the cover member into a space defined between said internal frusto-conical surface of said housing and the outer surface of said other one of said telescopically interfitting members; and resilient means disposed within said cover member and normally effective to bias said cover member towards said one member and to bias said locking elements to positions within said housing whereat they effect a jamming connection between said internal frusto-conical surface of said housing and an outer surface of said other of said telescopically interfitting members whereby to inhibit relative movement between said telescopically interfitting members.
The telescopically interfitting members may, for example, comprise an extension member constituting said one member and a hollow section post constituting the other of said members, the internal dimensions of which post are such as to receive the extension member for sliding movement therewithin. The telescopically interfitting members may be of any suitable crosssectional configuration, for example, a round, rectangular or polygonal cross-section.
The locking elements are preferably in the form of wedge-shaped members which upon insertion in the space between the internal surface of said housing and the outer surface of said extension member are effective to wedge said extension member and thereby inhibit relative movement thereof relative to said housing and consequently to said post to which said housing is connected.
Other features and objects of the invention will be described hereinafter and referred to with reference to the accompanying drawings which show exemplary embodiments of the invention, and in which: Figure 1 is a longitudinal view, partly in section, showing the invention embodied as an adjustable prop;
Figure 2 is a longitudinal view of a detail, partly in section, of the adjusting nut and post member of Figure 1 incorporating means for preventing total screw off of the adjusting nut;
Figure 3 is a top plan view showing a locking and adjusting mechanism in accordance with the invention; and
Figure 4 is a top plan view of locking elements as incorporated in the exemplary embodiments.
Referring to the drawings, the support device, which in the embodiment illustrated is a self-locking adjustable prop, employs two telescopically interfitting members designated 2 and 4, respectively. The members 2 and 4 may conveniently be appropriate lengths of standard, commercially available, scaffold tubing and each tube is provided at one end with an end plate, 6 and 8 respectively. Whilst in the exemplary embodiment illustrated the members 2 and 4 are shown as round tubes it is to be noted that they may be of other configurations; for example they may be of rectangular or polygonal crosssection. The end plates, 6 and 8, may be attached to their associated tube either fixedly in the manner illustrated, as for example by welding at 9, or, removably in any suitable manner known per se.
At is end remote from end plate 8 and extending inwardly therefrom the outer tube 4 is provided with an externally threaded section 10 and the inner tube 2 forms a slidable fit within outer tube 4 to permit telescoping of the tubes one within the other.
An adjusting nut 12 having an internal thread 11 is threadedly engaged with the upper threaded portion 10 of outer tube 4 and movable along the length thereof. A handle member 14, bifurcated at 15, 16 is pivotally connected to the adjusting nut 12 by means of a pin 13 passed through apertures formed in the bifurcated end portions 15, 16 and secured therein by a split pin. A collar 17 formed at one end with a generally cylindrical portion 18 terminates at its free end in a flange 20 and at its other end in a frusto-conical portion 22 constituting a housing for receiving locking elements as will be described hereinafter, said housing terminating at its free end in a flange 24. The inner end of the frusto-conical portion 22 merges into a short, cylindrical portion 25 of the same cross-section as the small end of the frusto-conical portion 22 and is interconnected through a shoulder portion 26 with the cylindrical portion 18. The flange 20 is fixedly, though rotatably, received in a groove 27 formed in the adjusting nut 12.
It may be desirable in some applications to ensure that the adjusting nut 12 cannot be inadvertently uncoupled from the post 4 once mounted thereon. This may be accomplished in a simple and efficient manner by, as shown in Figure 2, building a weld 21 into the outer terminal edge of the thread 10 using only sufficient weld to ensure that the adjusting nut 12 cannot be screwed in a direction off post 4 beyond the position shown in
Figure 2 whereat the top faces 28, 29 of the adjusting nut 12 and the threaded end of the post 4, respectively, are flush.
The tubes 2 and 4 are adapted to be lockably interconnected by means of locking elements which, in the embodiment shown, consist of wedges, 30, pivotally connected to, by pins 31, and extending within a cover member 32. In the embodiment shown three equi-spaced wedges 30 are provided. The cover member 32 comprises an annular skirt 34 and an end plate 35 formed with a central aperture 36 and equi-spaced recesses 37 extending outwardly therefrom and through which the locking elements 30 depend to within the annular skirt 34. A short cylindrical neck portion, 38, extends from the edge of the aperture 36 in a direction parallel to and away from skirt 34 and snugly circumjaces the outer surface of the inner tube 2 when the cover 32 is mounted thereon.
The locking elements, i.e. the wedges 30 are preferably made of metal with either the whole wedge or at least the gripping surfaces thereof suitably case hardened, sherardised or otherwise treated to ensure that the gripping surfaces are harder than the material which they are to engage or into which they are to bite or grip i.e. the outer surface of outer tube 4 and the inner surface of the frusto-conical portion 22 of the collar 17.
Also as in the exemplary embodiment shown in the drawings gripping surfaces 33 may be serrated or otherwise roughened to improve their gripping capabilities. Suitably the wedges are castings of, for example, S.G.
iron containing 1.52.0% nickel.
A suitable resilient means which may, for example, as in the embodiment shown, comprise a spring 40, is disposed around and extends longitudinally of the outer surface of the frusto-conical portion 22 and within the cover member 32 being retained therein by its engagement at one end with the flange 24 and by its engagement at its other end with a circlip 44 inserted in a groove 46 formed in the inner wall of skirt 34 adjacent the open end thereof.
The spring 40 is normally effective to bias collar 16 and consequently the locking elements, i.e. the wedges 30, in a direction relative to the housing into a position whereat their inner gripping surfaces, which are preferably serrated or faced with non-slip material or machined to provide non-slip surfaces, grippingly engage the outer surface of the inner tube 2 and effectively interlock the inner and outer tubes, 2 and 4 respectively.
With this arrangement there is at all times a positive bias of the locking elements, i.e.
the wedges 30, into gripping engagement with the outer surface of inner tube 2 and the inner surface of the frusto-conical portion 22 of the collar 17, and this greatly facilitates installation of and adjustment of the support device in horizontal or other non-vertical configurations.
The spring 40 may be selected such that it exerts a force sufficient to hold the inner and outer tubes against relative movement pending final adjustment of the overall length of the support device to match the gap to be bridged thereby, for example that between the walls of a pipe trench or the like, or between the roof and floor of a mine tunnel, but which permits each manual adjustment of the relative position of the inner and outer tubes to enable final adjustment of the overall length of the support device to be made. As will be appreciated with the construction shown in the drawing the spring 40 is disposed between the cover and the housing and co-acts therewith in a manner normally effective to bias the locking elements, i.e. the wedges 30, into the position whereat their inner surfaces grippingly engage the outer surface of the inner tube 2.
Final and fine adjustment of the overall length of the support device is effected by means of the adjusting nut 12. Initially the adjusting nut 12 is screwed onto the threaded portion 10 of the outer tube 4 to a position whereat it is located at or adjacent the innermost end of the threaded portion 10 whereby to provide the maximum amount of adjustment of the overall length of the support device.
The collar 17 with its frusto-conical housing 22, in conjunction with the conjointly movable locking elements, i.e. the wedges 30 and associated resilient means in the form of the spring 40, together constitute an adjustable self-locking mechanism adapted to be mounted on the outer one, 4, of the pair of telescopically interfitting members, 2 and 4, in a manner permitting movement of the housing longitudinally relative to the outer member 4 to provide adjustment of the overall length of the support device. The locking elements 30, when inserted in the housing, in use of the support device, cooperate therewith to interlock said telescopically interfitting members 2 and 4 against longitudinal movement relative to one another.
In an alternative arrangement, not shown, the adjusting nut 12 may be fitted over a complementary screw-threaded member which latter is attachable in a non-rotatable manner to end portion 10 of member 4 in which case end portion 10 would not be threaded as in the illustrated embodiments.
This arrangement would be particularly, although not exclusively, suitable where the telescopically interfitting members 2 and 4 are of non-circular cross-section.
An aperture 52 is formed in the peripheral wall of outer tube 4 and enables the position of the inner tube 2 therein to be monitored, it being desirable that the end of inner tube 2 extend into outer tube 4 to at least the centre of the aperture 52. This arrangement ensures that a minimum length of inner tube 2 is housed and extends within the open end of outer tube 4 to provide the required overall strength and rigidity of the support device.
In operation the support device, which as illustrated is in the form of a prop, is adjusted to the approximate length required, for example the span to be bridged, by moving the inner tube 2 outwardly relative to the outer tube 4, against the bias of the spring 40 which latter exerts a force which is normally sufficient to hold the tubes 2 and 4, via the wedges 30, against relative movement but which permits easy manual adjustment of the relative position of the two tubes and thus of the overall length of the support device constituted by the telescopically interfitting tubes 2 and 4. With the support device, i.e.
the prop, thus adjusted to its approximate desired overall length final adjustment is effected by pivoting the handle 14 about pin 15 to its operative position whereat it extends in a direction normal to the longitudinal axis of the support device, whereafter rotation thereof in an anti-clockwise direction is effective to move the adjusting nut along the threaded portion 10 towards the open end of outer tube 4. Movement of the adjusting nut in this direction serves to move the locking mechanism with entrained inner tube 2 in the same direction relative to the outer tube 4 and thereby increase the overall length of the support device by the required amount to provide a final adjustment thereof.Upon completion of the final adjustment of the overall length of the prop, the handle 14 may be pivoted about pin 15 to its collapsed position, as shown in the drawing, where it extends parallel to the longitudinal axis of the support device.
To release the prop it is simply necessary to rotate the adjusting nut via handle 14 (conveniently pivoted about pin 15 to its operative position) in a clockwise direction to reduce the overall length of the support device whereafter the two tubes, 2 and 4, constituting the support device may be manually telescoped one within the other against the bias exerted on the locking wedges 30 by the spring 40 and the support device can then be collapsed and removed.
WHAT WE CLAIM IS:
1. A self-locking adjustable support device comprising, two telescopically interfitting members, a housing, means connecting the housing to one end of one of said telescopically interfitting members in a manner permitting the housing to be adjusted in position longitudinally relative to said one member, said housing being formed with a portion having an internal frusto-conical surface, said connecting means permitting rotation of said housing relative to said one member about its longitudinal axis to permit adjustment of the overall length of the support device; a cover member arranged to circumjace the free end of said housing and having a plurality of locking elements depending therefrom into a space defined between said internal frusto-conical surface of said housing and the outer surface of said other one of said telescopically interfitting members, and resilient means disposed within said cover member and normally effective to bias said cover member towards said one member and to bias said locking elements to positions within said housing whereat they are in gripping engagement with said other one of said telescopically interfitting members so as to inhibit movement of said other member in one direction longitudinally relative to said one member.
2. A support device as claimed in Claim 1, wherein the locking elements are pivotally connected to said cover member.
3. A support device as claimed in Claim 1 or Claim 2, wherein the cover member comprises a centrally apertured plate and has an annular skirt member secured thereto and depending therefrom at or adjacent an outer peripheral edge thereof.
4. A support device as claimed in Claim 3, wherein said plate and said skirt member are formed integral.
5. A support device as claimed in Claim 3 or Claim 4, wherein a neck portion extends from the central aperture of said plate coaxially therewith and in a direction opposite to that in which said skirt extends from said plate, said neck member being arranged, when said other one of said telescopically interfitting members extends through said central aperture, to form a snug fit around said other member.
6. A support device as claimed in any preceding claim, wherein said resilient means is removably retained within said cover.
7. A support device as claimed in any preceding claim, wherein said resilient means comprises a spring disposed around an outer surface of the frusto-conical portion.
8. A support device as claimed in any preceding claim, wherein said locking elements are in the form of wedge-shaped members.
9. A support device as claimed in any preceding claim, wherein said locking elements are made of metal.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (28)
1. A self-locking adjustable support device comprising, two telescopically interfitting members, a housing, means connecting the housing to one end of one of said telescopically interfitting members in a manner permitting the housing to be adjusted in position longitudinally relative to said one member, said housing being formed with a portion having an internal frusto-conical surface, said connecting means permitting rotation of said housing relative to said one member about its longitudinal axis to permit adjustment of the overall length of the support device; a cover member arranged to circumjace the free end of said housing and having a plurality of locking elements depending therefrom into a space defined between said internal frusto-conical surface of said housing and the outer surface of said other one of said telescopically interfitting members, and resilient means disposed within said cover member and normally effective to bias said cover member towards said one member and to bias said locking elements to positions within said housing whereat they are in gripping engagement with said other one of said telescopically interfitting members so as to inhibit movement of said other member in one direction longitudinally relative to said one member.
2. A support device as claimed in Claim 1, wherein the locking elements are pivotally connected to said cover member.
3. A support device as claimed in Claim 1 or Claim 2, wherein the cover member comprises a centrally apertured plate and has an annular skirt member secured thereto and depending therefrom at or adjacent an outer peripheral edge thereof.
4. A support device as claimed in Claim 3, wherein said plate and said skirt member are formed integral.
5. A support device as claimed in Claim 3 or Claim 4, wherein a neck portion extends from the central aperture of said plate coaxially therewith and in a direction opposite to that in which said skirt extends from said plate, said neck member being arranged, when said other one of said telescopically interfitting members extends through said central aperture, to form a snug fit around said other member.
6. A support device as claimed in any preceding claim, wherein said resilient means is removably retained within said cover.
7. A support device as claimed in any preceding claim, wherein said resilient means comprises a spring disposed around an outer surface of the frusto-conical portion.
8. A support device as claimed in any preceding claim, wherein said locking elements are in the form of wedge-shaped members.
9. A support device as claimed in any preceding claim, wherein said locking elements are made of metal.
10. A support device as claimed in any
preceding claim, wherein said locking elements are formed as castings of iron containing 1.52.0% nickel.
11. A support device as claimed in any preceding claim, wherein said means connecting the housing to said one of said telescopically interfitting members comprises an internally threaded element arranged threadedly to engage an externally threaded portion formed at one end of said one member.
12. A support device as claimed in Claim 11, wherein said internally threaded element is formed with an annular groove internally thereof and said housing is provided at one end with a protuberant surface adapted to engage in said groove to permit relative rotation but to inhibit relative longitudinal movement between said housing and said internally threaded element.
13. A support device as claimed in Claim 11 or Claim 12, wherein said internally threaded element is provided with a handle member to facilitate rotation of said internally threaded element relative to said one member through its threaded engagement therewith whereby to permit adjustment of the housing longitudinally relative to said one member.
14. A support device as claimed in any preceding Claim, wherein each of said telescopically interfitting members is of circular cross-section.
15. A support device as claimed in Claim 14, wherein said telescopically interfitting members consist of lengths of standard scaffolding tube.
16. A support device as claimed in any one of Claims 1 to 13, wherein each of said telescopically interfitting members is of rectangular cross-section.
17. An adjustable self-locking mechanism for use in association with a support device having two telescopically interfitting members, said mechanism comprising a housing arranged to be connected to one end of the outer one of said telescopically interfitting members in a manner permitting said housing to be adjusted in position longitudinally relative to the other of said members to permit adjustment of the overall length of the support device, said housing having a portion defining an internal frusto-conical surface, a cover member arranged to circumjace the portion of the housing defining the internal frusto-conical surface, a plurality of locking elements depending from the cover member into a space defined between said internal frusto-conical surface of said housing and the outer surface of said other one of said telescopically interfitting members; and resilient means disposed within said cover member and normally effective to bias said cover member towards said one member and to bias said locking elements to positions within said housing whereat they effect a jamming connection between said internal frusto-conical surface of said housing and an outer surface of said other of said telescopically interfitting members whereby to inhibit relative movement between said telescopically interfitting members.
18. A mechanism as claimed in Claim 17 wherein said locking elements are pivotally connected to said cover member.
19. A mechanism as claimed in Claim 17 or Claim 18, wherein said cover member comprises a centrally apertured plate and has an annular skirt member secured thereto and depending therefrom at or adjacent the outer peripheral edge thereof.
20. A mechanism as claimed in Claim 19, wherein said plate and said skirt member are formed integral.
21. A mechanism as claimed in Claim 19 or 20, wherein a neck portion extends from the central aperture of said plate coaxially therewith and in a direction opposite to that in which said skirt extends from said plate, said neck member being arranged, when said other one of said telescopically interfitting members extends through said central aperture, in use of the mechanism, to form a snug fit around said other member.
22. A mechanism as claimed in any one of Claims 17 to 21, wherein said resilient means is removably retained within said cover.
23. A mechanism as claimed in any preceding claim, wherein said resilient means comprises a spring disposed around an outer surface of the frusto-conical portion.
24. A mechanism as claimed in any preceding claim, wherein said locking elements are in the form of wedge-shaped members.
25. A mechanism as claimed in any preceding claim, wherein said locking elements are made of metal.
26. A mechanism as claimed in any preceding claim, wherein said locking elements are formed as castings of iron containing 1.5-2.0% nickel.
27. A self-locking adjustable support device constructed, arranged and adapted to operate substantially as described herein with reference to the accompanying drawings.
28. An adjustable self-locking mechanism for use in a telescopic support device, said mechanism constructed, arranged and adapted to operate substantially as described herein with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1299378A GB1603025A (en) | 1978-04-03 | 1978-04-03 | Self-locking adjustabel support devices and adjustable self-locking mechanisms for use therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1299378A GB1603025A (en) | 1978-04-03 | 1978-04-03 | Self-locking adjustabel support devices and adjustable self-locking mechanisms for use therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1603025A true GB1603025A (en) | 1981-11-18 |
Family
ID=10014878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1299378A Expired GB1603025A (en) | 1978-04-03 | 1978-04-03 | Self-locking adjustabel support devices and adjustable self-locking mechanisms for use therewith |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1603025A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5273378A (en) * | 1991-05-10 | 1993-12-28 | Volker Merz | Support column |
| US5499890A (en) * | 1994-07-08 | 1996-03-19 | Americ Corporation | Trench shoring device with locking mechanism |
| US5513555A (en) * | 1994-01-21 | 1996-05-07 | Michael J. Plank | Quick-release cam lock with locking pin |
| CN1058318C (en) * | 1997-08-27 | 2000-11-08 | 太原理工大学 | Single machinery prop |
| AU729637B2 (en) * | 1997-05-06 | 2001-02-08 | Lung-Li Shih | Steel post for supporting a molding board |
| CN101994514A (en) * | 2010-11-10 | 2011-03-30 | 李其明 | Bidirectional hydraulic landing leg rod |
-
1978
- 1978-04-03 GB GB1299378A patent/GB1603025A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5273378A (en) * | 1991-05-10 | 1993-12-28 | Volker Merz | Support column |
| ES2105932A1 (en) * | 1991-05-10 | 1997-10-16 | Volker Merz | Shaft lining support |
| US5513555A (en) * | 1994-01-21 | 1996-05-07 | Michael J. Plank | Quick-release cam lock with locking pin |
| US5499890A (en) * | 1994-07-08 | 1996-03-19 | Americ Corporation | Trench shoring device with locking mechanism |
| AU729637B2 (en) * | 1997-05-06 | 2001-02-08 | Lung-Li Shih | Steel post for supporting a molding board |
| CN1058318C (en) * | 1997-08-27 | 2000-11-08 | 太原理工大学 | Single machinery prop |
| CN101994514A (en) * | 2010-11-10 | 2011-03-30 | 李其明 | Bidirectional hydraulic landing leg rod |
| CN101994514B (en) * | 2010-11-10 | 2014-10-15 | 李其明 | Bidirectional hydraulic landing leg rod |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |