Patent GB-636739-A (GB)
Title: Improvements in or relating to extensible ski sticks
IPC: A63C11/22
Filed: 1947-01-03
Abstract: 636,739. Extensible ski-sticks. TVETEN, G. Jan. 3, 1947, No. 224. [A Specification was laid open to inspection under Sect. 91 of the Acts, Jan. 3, 1947.] [Class 132 (i)] An extensible ski-stick comprises two stick members relatively displaceable with respect to each other and lockable in different relative positions, the stick member which forms the handle part of the stick being provided with a longitudinal axial spindle, having screw threads or transverse grooves and being adapted releasably to engage a nut or sleeve having internal screw threads or transverse grooves which is secured to the other stick member, the screw threads or transverse grooves of both the spindle and the nut or sleeve being omitted or removed therefrom at certain portions thereof in such manner that the spindle is locked against axial displacement in the nut or sleeve when in a certain angular position with respect to the nut or sleeve but may be displaced in the nut or sleeve when turned to another angular position. In Fig. 3, the handle part 1 of the stick comprises a mainly hexagonal tube and has a metal plug 3 secured in its upper end. A freely rotatable spindle 7 passes through the bore of plug 3 and a knurled circular or polygonal knob 6 secured to the top end of spindle 7 serves as a finger grip for rotating the spindle. Below the plug 3, spindle 7 is provided with screw threads or ransverse grooves which are entirely or in part removed or omitted along two opposite sides of the spindle. The spindle 7 is adapted to be received in an axial opening in a nut or sleeve 10 secured in the upper end of the other stick member 2. Stick member 2 is also tubular and may extend to the bottom end of the ski-stick or it may be secured to the end of a tube of still smaller diameter which forms the bottom part of the stick. The axial bore in the nut or sleeve 10 is provided with screw threads or transverse grooves with which the screw threads or grooves of spindle 7 may engage. The screw threads in the nut or sleeve bore are, however, entirely or partially omitted or removed at two opposite sides. In each of two opposite holes in plug 3 a ball 15 actuated by spring 14 is provided, the balls 15 co-operating with recesses of which there are four spaced at 90 degrees relatively to each other, in the underside of knob 6. When the spindle is in either the locked or the displaceable position, the balls are pressed into the recesses. Alternatively, the recesses may be provided in plug 3, and balls 15 in holes in knob 6. Balls 18 are also provided in two diametrically opposed radial holes in nut 10 and are urged towards the spindle by means of springs 19. Balls 18 co-operate with the threads of spindle 7. Tube 1 may have polygonal shapes other than hexagonal and may even be oval in crosssection. Alternatively it may be cylindrical with one or more internal longitudinal grooves in which engage projections on tube 2. Instead of tube 2 an ordinary wooden rod may be employed, this rod having a narrow axial bore for reception of spindle 7 and a wider bore in its top portion for reception of the nut 10. The Specification as open to inspection under Sect. 91 refers to an extensible ski-stick comprising two or more stick members, one of the members being provided with the longitudinal spindle. This subject-matter does not appear in the Specification as accepted.