Lifting-jacks and the like.


2 5 , 8 4 7. Allison, C. A., [Searls, A.]. Nov. 28. Lifting-jacks.-Consists of a telescopic ratchet jack intended more especially for use with motor cars. The jack is shown open in Fig. 1 and closed in Figs. 5 and 6. To a head H, in which slides the lifting rack-bar R, are pivoted at p and p<1> legs L, L<1> connected at the bottom by a folding brace l, l<1>, a projection e on which is guided in a slot s in an extension A' of the head H. The feet of the legs L, L<1> have each two faces so that the jack n ay stand up in the closed as well as in the open position, the legs being then locked together by a catch c', and the head H steadied by engagement of its extension A<1> with the inner sides of the legs. Pivoted at p<2> in the top of the head H is a lever A, to the short arm of which is pivoted a pawl P adapted to engage the teeth r of the rack-bar. The similar retaining-pawl P<1> is pivoted at p<3>. The reverse action of the pawls for lowering is obtained by means of a weighted lever C pivoted at p<3>. A lug l<3> on the pawl P' can engage a slot in the arm a of the lever C, and a finger f on the pawl P can engage the top of the arm a, the arrangement being such that the weight C raises the pawl P' as soon as the load is taken by the pawl P, which latter near the end of its downward movement depresses the arm a, thus allowing the pawl P' again to engage the rack R. The rack is formed to take a telescopic part T. which is adjustably secured to it by lugs l<4>, l<5> on the one engaging apertures in the other. The teeth r are in the form of cross-bars connecting the sides of the rack-bar. In a modification intended for heavier loads, the teeth are solid and of the more usual serrated form, and the pawls are correspondingly modified in shape.




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