Patent GB-251302-A (GB)
Title: An improved amusement device
IPC: A63G11/00
Filed: 1926-04-26
Abstract: 251,302. Nairn, J. S. April 27, 1925, [Convention date]. See-saws; roundabouts.-A beam 15 is mounted on a tube 16 in such a manner as to be capable of being used as a see-saw, or of being rotated in a horizontal or inclined position, or of having a combined see-saw and rotary movement. A frame 47 is mounted on the beam 15 and is provided with a bearing for the upper end of a spindle 59 passing through the tube 16 and also with slots 46 for the inner ends of spindles 44 extending to the seats. The spindles 44 are driven by handles 50, which may have ratchet-gearing, and pinions 43 on the inner ends of the spindles engage either a non-rotatable crown-wheel 41 secured to the tube 16 or a crown-wheel 60 secured to the spindle 59. Tubes 53 surrounding the spindles 44 may be turned from the seats and by means of eccentric 54 cause the spindles to be raised or lowered. With both spindles lowered, the crown-wheel 60 is lowered, and clutch members 63, 64 engage to prevent rotation of the beam and of the spindle 59. Props 27, provided with foot-rests 27', have first to be raised by handles 28, which, when depressed, form the fourth sides of the seats formed by U-members 24 and rails 25. The handles 28 are held in lowered position by engagement with slots in extensions of the rails 25. Both props- 27 work simultaneously, being connected by links 30 to two lazy-tong systems 33, which are pivoted at 34 to the beam and are connected together. One prop is also connected by a link 35 to a lever 36, and a bar 37 pivoted to the lever 36 and a second lever 38, both of which depend from the beam 15, is raised by the movement of the prop out of engagement with slots in a raised annular rim of a member 21 which supports the tube 22. Thus rotation of the beam is prevented until the prop is raised. The lower end of the spindle 59 is provided with a pinion 65 in the form of a frustum of a sphere meshing with elliptical gears 66. Thus rotation of the crown-wheel 60 causes the spindle 59 and beam 15 to oscillate. One sleeve 63 is provided with link 67 connected to a lever 68 to the other end of which is connected a rod 69. This rod has a hook 70 engaging a bar 71 which normally rests in a second pair of slots in the member 21. Rotation of the beam is thus prevented until the right-hand pinion 43 is lowered to raise the bar 71, which does not completely leave the slots but rides up inclined portions on one side of each slot. Retrograde movement is prevented by engagement of the bar with the other vertical portions of the slots. With the pinions 43 in the position shown in Figs. 1 and 3, rotation is prevented, but operation of the right-hand handle 50 causes the spindle 59 to oscillate by the engagement of the gear 65, 66, while operation of the left-hand handle causes the beam to rotate. The beam may previously have been placed in an inclined position. With the left-hand pinion raised, the beam can only seesaw by the rotation of this pinion when the other pinion is lowered. A latch holds the sleeves 53 in either desired position, and the handles 50. may be secured by a loop 73 carrying a weight 74. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a beam carried on a fork mounted on a vertical bearing, a horizontal or undulating track engaging rollers on the underside of the beam being employed as a support. This subject-matter does not appear in the Specification as accepted.