Brakes – Operators – Automatic
Patent
1985-09-24
1987-06-02
Butler, Douglas C.
Brakes
Operators
Automatic
188378, 248636, 248571, 267 8D, F16F 316, F16F 320, F16F 932
Patent
active
046695842
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
In means by which pipe work is supported, it may be necessary to accommodate some movement in the pipe work as a result of variations in surrounding conditions. It may also be necessary, though, to ensure that sudden loads on the pipe work will not result in intolerable movement of the pipe work and the present invention arose from a consideration of the ways in which appropriate support might be achieved.
According to the present invention, there is provided an inertia stop by which excessive movement between two members may be prevented, comprising a unit that may be fixed to one of the members and a further unit that includes a free component and a component that may be fixed to the other of the members, one component being in the form of an externally threaded shaft and the other component being in the form of an internally threaded block that is loosely rotatable on, relatively to, the shaft with the threads engaging so that the free component may rotate relatively to the other between a position in which it is dissociated from the first unit and a position in which it engages with the first unit so that further rotation in that direction is prevented, resilient means being included in the stop to establish a separation between the free component and the other unit during acceptable relative movement of the members but that will be overcome by the inertia of the free component relatively to the fixed component resulting from an unacceptable relative movement of the members to an extent that permits the free component to come into contact with the other unit.
By way of example an embodiment of the invention will now be described with reference to the accompanying drawings in which:
FIG. 1 shows in axial section an inertia stop by which the excessive movement of a pipe or other component, laterally towards a support may be prevented;
FIG. 2 is perspective view of the stop that is shown in section in FIG. 1;
FIG. 3 shows in axial section a modification of what is shown in FIG. 1 so that excessive rotation of a component relatively to a support may be prevented
FIG. 4 shows schematically an inertia stop that can be operated by sudden movement of a pipe or other component either towards or away from a support; and
FIG. 5 shows in axial section another embodiment of the invention by which sudden axial rotation of a component relatively to a support may be inhibited.
The stop shown in FIG. 1 includes a first unit 1 and a further unit 2.
The further unit 2 includes, as one component, a shaft 10 provided at one end with means 11 by which it may be fixed to a pipe or other component that is to be supported. The end of the shaft 10 remote from the means 11 is smooth for about half the length of the shaft whilst between the smooth part and the means 11 it is provided with an external thread 12 of high constant pitch. This thread 12 may be envisaged as a parallel sided strip wound round, and fixed to, the shaft rather than being of more usual V-shaped cross-section.
The unit 12 includes a section component that comprises a massive circular block 15 internally threaded so that it can rotate easily and loosely on the threaded part of the shaft 10. At the end remote from the means 11, the block 15 is provided with a central recess 16 that contains an inset 17 mounted on balls 18 so that it can revolve freely within the block 15.
The first unit 1, which serves as an anchor means, comprises essentially a hollow tube 20 having means 21 at one end by which it may be connected to a fixed support. The end of the tube 20 remote from the means 21 receives the smooth end of the shaft 10. The end that receives the shaft is provided with a cylindrical enlargement 24 having, at its outer end, a recess 25. A helical spring 26 lies co-axially around the shaft 10 and is fixed at one end within the recess 25 and at other end to the inset 17. The length of the spring 26 is such as normally to maintain a small maximum spacing between the block 15 and the enlargement 24.
As is shown clearly in FIG. 2, the part of the enlar
REFERENCES:
patent: 4094387 (1978-06-01), Pelat et al.
patent: 4105098 (1978-08-01), Klimaitis
patent: 4236606 (1980-12-01), Sunakoda et al.
patent: 4287969 (1981-09-01), Misumi et al.
Babcock Power Limited
Butler Douglas C.
Kemon Solon B.
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