Patent GB-190811310-A (GB)
Title: Improvements in Fluid Operated Power Transmission Mechanism.
Inventor: KELLOGG CHARLES SNOW
Filed: 1908-05-25
Granted: 1909-05-25
Abstract: 11,310. Kellogg, C. S. May 24, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Brakes.-Hydraulic apparatus for variably transmitting speed or for reversing, and which may be used as a brake, comprises a rotary pump arranged within a casing which also contains the motor elements, some of which may be coupled direct to the driven shaft and some geared through hand or automatically operated clutches. An ordinary controlling and reversing valve is fitted, and also a separate control valve. Means are provided for positively clutching the shafts together under certain circumstances. Fig. 1 shows a longitudinal section of the apparatus and Fig. 2 a transverse section on the line 2-2. The pump body D is secured to the driving-shaft A and is provided with radial projections d'. An abutment E for allowing the passage of the projections d<2> is rotated by gearing driven from the shaft A. The casing of the pump is divided by partitions e. The liquid is forced through the passage f past the controlling and reversing valve J, shown in Fig. 6, into the chambers a, b of the motor elements G, H and back through the valve J to the other side of the pump D. The ports k<2>, k<3> in the valve, shown in Fig. 7, allow of the reversal of the driven shaft, and the byepass j<9> allows of the passage of fluid when the valve is closed. The motor elements, the body G<1> of which is directly secured to its shaft and the body H<1> clutched to said shaft, are of similar construction to the pump element D. The valve J is operated through the gearing J<2>, J<4> operated from the sliding collar J<3>. In addition to the valve J, a rotary valve L is provided as shown in Fig. 9. This valve is provided with faces n, o, o', p differing in extent, which controls the opening of the ports j<9>, f<1>, a, a, b as shown in Figs. 3, 4, and 5, and is operated from the sliding sleeve m<4> by the mechanism m<1>, l<1>, m<2>, m<3>. The clutch for the loose motor body H<1> is arranged so as to become engaged by the continued movement of the collar m<4> at the same time as the valve p is opened to admit the actuating-fluid to the reserve motor element H when the latter is called into play. Clutches K, K<1>. preferably of the multipledisk type, are provided for coupling the casing C to the shafts in order to give direct drive. When it is desired to use the apparatus as a brake, the case C is held stationary by a brake such as L<4>. The body H<1> of the reserve motor element H may be automatically clutched to the shaft B by means of the pivoted lever q<4> shown in Fig. 10. This carries teeth at one end which engage in recesses in the shaft when the pressure fluid acts on the other end of the lever which forms a vane q<5>. Fig. 14 shows a form of the apparatus in which the shafts A, B are directly clutched by a dog clutch, and a simple band brake W is fitted for holding the case C stationary. Fig. 15 shows another form of automatic brake which acts, when the casing C commences to move in a reverse direction, by reason of the blocks v wedging in their seats.