Patent GB-712504-A (GB)
Title: Improvements in or relating to stabilising devices
IPC: G01C9/12
Filed: 1952-01-16
Abstract: 712,504. Clinometers. SUREL, H. J. Jan. 16, 16, 1952, No. 1300/52. Addition to 692,342. Class 97(2) The arrangement disclosed in the parent Specification is modified in that the member provided with the helicoidal thread or groove is engaged by a stud rigid with the supporting means and is connected to a member having a screw thread of smaller pitch for conjoint axial movement therewith but freedom to rotate relatively thereto about the common axis of the members and in that the last-mentioned member carries an internally threaded gear wheel which is freely rotatable but axially immovable with respect to the supporting means and meshes with one or more planet wheels, carried on a member rotatable about the axis of the gear wheel, rotationally coupled to the pendulous body, whose oscillatory movements about an axis parallel to the common axis of the two members are to be stabilized, and meshing in turn with a gear ring rigid with the supporting means such that inclination of the supporting means causes rotation of the gear wheel and axial movement of the screw-threaded and grooved members, the rotational movement of the grooved member resulting from the axial movement thereof relative to said stud being opposite to and cancelled by the parallel movement of the supporting means. The arrangement is shown as applied to the stabilization of a pendulous arm 27 of a clinometer having a case 10a to which is secured the object whose inclination is to be determined. Secured to a wall 11 a of the case at 41 is a gear ring 43 meshing with planet wheels 56, carried by an annular member 51 and meshing with a gear 47. Member 51 and the gear 47 are axially immovable, but freely rotatable about a bushing 15a in which a spindle 14a having a thread 46 meshing with gear 47 is axially movable but 'non-rotatable. Bushing 15a has a collar 59 around which an arm 61 carrying a weight 62 may pivot. This arm is connected at 63 with a lug 64 secured by a pin 65, passing through a curved slot in wall 11a, to the member 51. The latter is connected by a rod 38a with the pendulum arm 27 to be stabilized and to a member 30, the rod passing through an arcuate slot in a wall 24. The pendulum arm 27 and member 30 are rotatable about a spindle 19 having a helicoidal groove 20 engaged by a stud projecting from wall 24, and member 30 carries an arm 31 having a roller 33 engaging a flat platform 34 on spindle 19 and terminating in an index 32 movable relative to a scale 35 on the case and viewable through a window 37. Spindle 19 is connected at 70, 71 to spindle 14a for axial movement therewith but rotation relative thereto. When the object to which the case is attached pivots about an axis parallel to the spindles 14a, 19, the case 10a rotates relatively to the arm 61 and the parts attached thereto so that gear 47 is rotated to cause axial movement of the spindles 14a, 19. The movement of spindle 19 is such that the consequent rotation of this spindle cancels out the rotation imparted thereto by the pin in wall 24 due to inclination of the case 10a with the result that index 32 remains fast and indicates on the scale 35 the object's inclination.