The Barrett Jacks.
Page 36
If you've noticed an error in this article please click here to report it so we can fix it.
We have recently been in touch with the White-Coleman Motors, Ltd., Carlow Street, Camden Town, London, N.W., concerning the very useful and comprehensive range of lifting jacks stocked by the concern. The Barrett jack, which is the name of the particular lifting device under consideration, is produced by the Duff Manufacturing Co., Pittsburg, U.S.A., the White-Coleman Co. being sole concessionnaire for the United Kingdom and Colonies.
Our illustration shows three entirely different types of jacks, all of them handled by the same house and made in the same factory. The second one from the left has a double-lift fitting, and is operated by means of an. arrangement of gears consisting of a bevel pair and a screwed thread inside the jack standard. The bevel pair is controlled by a small reversible ratchet, the key to operate which can be seen in our picture. The second jack from the right is an ordinary double-beat, ratchet-lift jack of sturdy design. The three jacks in the front row are also of the ratchet type, but they have embodied in them a spur-gear wheel upon which the ratchet acts, and which, in its turn, engages with the rack on the jack spindle proper. It will be seen, therefore, that. various classes of mechanism are employed in these interesting tools.
The company stocks altogether D10 about 20 different types of the device, the smallest of which is capable of lifting three-quarters of a. ton, and the largest model has a lifting capacity of 10 tons ; it will be at once seen that this range embraces all the requirements of the industry, from parcelears upwards. The Barrett jacks to which we would particularly draw the attention of our readers are Nos. 100 and 200 respectively ; these have been especially designed for use with lorries and garage service. The former is capable of lifting loads of three tons, and the latter five tons. In either of these the effective load lifted requires but
one-third the effort found necessary in operating the usual type of jack. The smaller example lifts to a height of 541 ins., whilst the larger can be raised to 6, ins. The selling price of No. 100 is £1 12s. 6d. with handle, and that of No. 200 is £2. The price of the 10-ton jack is £3 15s.
Evidence that these jacks give efficient service is forthcoming in that a large number of subsidized vehicles have been supplied with the device. We, ourselves, can also testify as to their good qualities, a member of THE COMMERCIAL MOTOR staff having used one of the jacks for some while past.