Patent ID: 8714314
Filing Date: 2014-05-06
Classification: A45C,B60B,Y10T

Abstract:
1. A locking mechanism of a drawbar braking castor, set between the extensible drawbar and castor of a mobile drawbar carrier, so as to control the locking and releasing state of the castor; the castor is set on the bottom of the mobile drawbar carrier, and composed of a castor seat and a castor body pivoted at bottom of the castor seat; said locking mechanism of drawbar braking castor comprising: an abutting base, set on the rear side of the mobile drawbar carrier; said extensible drawbar is extended upwards into the abutting base; an actuating space, formed in the abutting base and connected with the bottom of extensible drawbar, allowing the bottom of the extensible drawbar to be extended into the actuating space in a declining state; a pressing member, connected with the bottom of extensible drawbar, comprising of a assembling end and a pressing end; of which the pressing end is provided with a first oblique surface; a transverse sliding seat, set into the actuating space, comprising of a pressed side and an actuating side; of which, a second oblique surface is located on the pressed side correspondingly to the first oblique surface of pressing member, so that when the extensible drawbar is pressed downwards, the first oblique surface of the pressing member could be correspondingly abutted onto the second oblique surface, allowing the transverse sliding seat to transversely slide towards the actuating side; a round gear ring, set on one side or periphery of the castor body of the castor; the gear ring is defined to form locating flanges annularly arranged at interval; an embedded locking frame, assembled vertically onto the castor seat in a lifting state; the embedded locking frame comprises of a top end and an embedded end, of which the top end is protruded out of the castor seat, and the embedded end is provided with an embedded portion opposite to the locating flange of the round gear ring; a first resetting assembly, set correspondingly to the embedded locking frame, so that the embedded locking frame could be flexibly reset; a spacing base, located on the top end of the embedded locking frame, where a holding space is formed; a flexible inhaul cable, comprising of a pulled end and a pulling end; of which, the pulled end is connected with the transverse sliding seat; and the pulling end is penetrated into the holding space of the spacing base; a variable driving member, installed into the holding space of the spacing base and connected with the pulling end of the flexible inhaul cable; the pulling or release force of flexible inhaul cable could be transformed to the lifting force for driving the embedded locking frame by the variable driving member; a second rescuing assembly, set on the spacing base correspondingly to the variable driving member, enabling flexible resetting of the variable driving member under the pulling of the flexible inhaul cable; when the extensible drawbar is pressed downwards on the transverse sliding seat, the variable driving member is pushed to drive the embedded locking frame via the flexible inhaul cable, such that the locating flange of round gear ring could be interlocked by the embedded portion.