Joints and connections – Articulated members – Lockable at fixed position
Reexamination Certificate
2000-10-25
2003-06-10
Browne, Lynne H. (Department: 3679)
Joints and connections
Articulated members
Lockable at fixed position
C403S345000
Reexamination Certificate
active
06575655
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a kit of threaded rods and tubes.
Threaded rods and tubes for construction and craftwork are used very much. Furniture, shelf constructions, simple technical structures up to very complicated apparatus are made. Conceivable is also the application in the household, e.g. as curtain rails, hinges or mountings for table tops, etc.
Above all the combination of threaded rods with tubes or of tubes amongst one another creates great difficulties. Often for the required nominal size of a threaded rod there is not available any tube with a sufficiently large inner diameter for enveloping the threaded rod. It is then very difficult when for the threaded rod-tube combination to be matched there is yet to be found an additional tube which at a distance envelops the tube enclosing the threaded rod. With the selection then not only is the inner diameter of the tube surrounding the threaded rod to be considered but additionally one must take into account the correct selection of the outer diameter of this tube. This problem is multiplied with designs in which several tubes are to be inserted into one another in a telescopic manner.
SUMMARY OF THE INVENTION
It is the object of the invention to specify a kit of threaded rods and tubes with which there are possible many combination possibilities of threaded rod with tubes or tubes amongst one another.
According to the invention this object is achieved in that in a kit, consisting of threaded rods and tubes, to a standardised threaded rod there is allocated a tube whose inner diameter envelops the threaded rod at a distance and whose outer diameter is smaller than the inner diameter of the tube of the next larger threaded rod-tube allocation.
By way of the use of this kit there result very many combination possibilities of threaded rods with tubes or of tubes amongst one another. The time-consuming search for matching threaded rods and tubes is done away with. This is particularly advantageous for people with little prior technical knowledge since for the tubes obtainable on the market often not all details with regard to inner diameter and wall thickness are evident. With only one kit one obtains the possibility for example of using tubes as guide rails or hinges. It is particularly advantageous that the tubes may be inserted into one another in a telescopic manner.
A particularly advantageous kit consisting of threaded rods and tubes contains a first group of metric threaded rods according to the Standard DIN 13 T 1 in the grading M8, M12, M16 and M20, wherein to each threaded rod there is allocated a tube which has an outer size which is 3.5 mm larger than the nominal size of the associated threaded rod. The combination amongst other things permits the telescopic insertion into one another of all tubes contained in the kit. A further large advantage of this combination lies in the fact that it is the case exclusively of standardised commercially available threaded rods with usual nominal diameters. By way of this the combination variety is increased further since commercially available nuts and other threaded attachments may be combined with the kit.
A particularly advantageous embodiment form of the invention provides for the tubes belonging to the threaded rods with the grading M8, M12, M16, M20 to have a tube wall thickness of 1.5 mm. The distance between the threaded rod and the inner tube wall of the tube belonging to the threaded rod is then roughly always equal, by which means there is always given the same play of the clearance fit with the use in the combination threaded rod-tube. Also the clearance fit of the threaded rod-tube allocation remains the same.
According to a further embodiment form it is advantageously possible to extend the first group of metric threaded rods with the size M5. The tube allocated to this threaded rod has an outer size of approx. 7.5 mm and the tube wall is formed with a thickness of about 1 mm. By way of this extension it is possible to use the kit for applications in which threads with a relatively small nominal diameter are required. The tube allocated to this threaded rod may be introduced into the next larger tube of this group without any problem.
It is particularly advantageous to extend the first group of threaded rods with threaded rods with the metric nominal sizes M24 and M30. To each of these threaded rods there is allocated a tube which has an outer size about 5.5 mm larger than the nominal size of the associated threaded rod, wherein the tube wall is designed with a wall thickness of about 2.4 mm. By way of this extension it is possible to use the kit for applications in which threads with a relatively large nominal diameter are required. The tubes allocated to these threaded rods may be combined with the tubes of the first group without any problem.
A further particularly advantageous kit consists of threaded rods and tubes which contain a second group of metric threaded rods according to the Standard DIN 13 T1 in the grading M6, M10, M14 and M18, wherein to each threaded rod there is allocated a tube which has an outer size which is about 3.5 mm larger than the nominal size of the associated threaded rod. Also this combination permits amongst other things the telescopic insertion into one another of all tubes contained in the kit. A further great advantage of this combination lies in the fact that with the threaded rods used in this kit it is also the case of standardised commercially available threaded rods with standardised nominal diameters. By way of this the combination variety is increased further since commercially available nuts and other widely used threaded attachments may be combined with the kit.
A particularly advantageous embodiment form of the invention provides for the tubes belonging to the threaded rods with the grading M6, M10, M14, M18 to have a wall thickness of 1.5 mm. The distance between threaded rod and inner tube wall of the tube belonging to a threaded rod is then roughly always equal, by which means there is always given the same play of the clearance fit with the use in the combination threaded rod-tube. Also the clearance fit of the threaded rod-tube allocation remains the same.
According to a further embodiment form of the invention it is possible to to extend the second group of metric threaded rods with threaded rods with the metric nominal diameters M22 and M27, wherein to the threaded rod with the nominal size M22 there is allocated a tube with an outer size of about 26.5 mm and to the threaded rod with the nominal size M27 there is allocated a tube with the outer size of about 32.5 mm. The wall thickness of the tube with the outer size of 26.5 mm is about 1.9 mm and the wall thickness of the tube with the outer size of 32.5 mm measures about 2.4 mm. By way of this extension it is possible to use the kit for applications in which threads with a relatively large nominal diameter are required. The tubes allocated to these threaded rods may be combined with the tubes of the first group without any problem.
A further advantageous embodiment form of the invention envisages that in a kit of threaded rods and tubes, to each threaded rod there is allocated a tube with a square profile which encloses the threaded rod at a distance and whose outer sides are shorter than the inner sides of the square tube profile of the next largest threaded rod-square tube allocation. Tubes with a square cross section may be ideally used as e.g. guide rails, wherein they are infinately extendable in length by the possibility of the telescopic insertion into one another within a kit. Also the combination of threaded rod and tube is conceivable for many applications such as e.g. shelf constructions. Thus all advantages described in the case of circular tubes also apply to tubes with a square profile. There opens up the possibility on account of the similarity of the sizes of circular tube and square tube of then additionally combining these, so that e.g. a round tube with an inner lying threaded rod is insertable into a
Speicher Thomas
Wilbs Thomas
alfer Aluminum Gesellschaft mbH
Browne Lynne H.
Cottingham John R.
Notaro & Michalos P.C.
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