US 2449863 A
Description (OCR text may contain errors)
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Filed March 3l. 1945 Sept.. 21, N48.
W. A. ROSS LOAD LIFTING APPLIANCE 3 Sheets-Sheet 3 Filed March 31, 1945 Patented Sept. 2l, 1948y LOAD LIFTING APPLIAN CE William A. Ross, Springfield, Ill., assigner to Weaver Manufacturing Company, Springfield, Ill., a corporation of Illinois Application March 31, 1945, Serial No. 585,929
The present invention pertains to certain innovatory and valuable structural and functional advantages and benefits in load-lifting appliances for various purposes, such, for example, as the elevation of bombs for attachment to airplanes, but it is to be understood that the apparatus is in sense limited to such specific employment since it may be satisfactorily used in numerous other relations; furthermore, the invention, as defined in the appended claims, is not necessarily restricted or limited to the"details of construction illustrated and described in that varloue modifications and changes may be resorted to without departure from the fundamental principles of the invention and without the loss or sacrifice of its material services.
To enable those skilled in this art to fully understand the invention, two preferred embodiments thereof have been illustrated in detail in the accompanying drawings to which reference should be had and in which the same parts have been supplied with like reference characters throughout the several views.
In these drawings:
Figure 1 is a side elevation of the novel lifting apparatus in its lowered condition;
Figure 2 is a comparable View of the device in its elevated relation:
Figure. 3 is a plan view of the appmnce with parts broken away;
Figure 4 is a vertical cross-section on line 4--4 of Figure 3 viewed as indicated by the arrows;
Figure 5 is -a side elevation of a modified structure in lowered state;
Figure 6 is an analogous View of the same in elevated relation; and
Figures 7 and 8 are fragmentary detail views.
Referring first to the apparatus presented in Figures l to 4 inclusive, it will be noted that the structure in this particular case includes an elongated vehicle-chassis II' mounted on six carrying-wheels I2, I2 the front pair being manually steerable by a convenient handle I3.
The saddle or load-carrying frame, characterized as a whole I4, at each of its opposite ends, has cross bars or frames I5, I5 which in the lowermost position of the saddle rest upon the top of, and are supported by, the side-bars I6, I6 of the chassis.
The two ends of each of the two transverse vmembers I5, I5 have hinged thereto at I1, I1 the opposite ends I8, I8 of a U-shape bell-crank frame I9 (see Figure 3) having hinged thereto at 2| a pair of links 22, 22 hinged at their lower ends to the chassis side-frame at 23, 23.
So far as described, these mechanisms are alike but reversed at both ends of the saddle or carriage I4.
Each such mechanism is operated independently of the other, or simultaneously therewith. by a cylinder 24, hinged to the central part of the chassis at 25, and the piston-,rod 26 of the piston in the cylinder, hinged at 2l on a cross-rod 2B supported by supplemental arms 29, 25 integral with the member I9 (Figure 3). V
The carriage front element I5 only has links 3l hinged at 32 to each of its opposite ends, each such link having its rear end hinged 'at ,33 on a stationary bracket 34 mounted on, and fixed to, the corresponding side-bar I6 of the chassis I I.
The apparatus additionally includes two independently operable, manually actuated oilpumps 35, 36 of ordinary and known construction drawing their oil from a common supply-tank 3l, the forward pump 36 being connected by a conduit 33 to the interior of the lower portion of the front cylinder 24, the other pump 35 being joined in like manner to the rear cylinder 24 by a separate or independent conduit 39.
Obviously, when pump 351s actuated by hand, the front lifting mechanism is operated and when pump 35 is utilized, the rear elevating` means functions.
In the modied type of lifting-appliance, presented in Figures 5, 6, 7 and 8, the construction is the same as that already described except that, as to the front linkage, the links SII, 3| are omitted and the parts II9, corresponding to the elements I9 already referred to, are made longer and have sliding connections with the two sidebars of the chassis, each such connection comprising a horizontal-bar 4I mounted on the sidebar and in the guiding groove oifered thereby a roller 42 on the element I I9 travels forwardly and rearwardly.
From what precedes, it will be obvious that independent operations of the two manually-actuated oil-pumps 36 and 35 supply oil under pressure-to the front and rear hydraulic-cylinders 24, 24 permitting the separate raising or lowering of either end of the saddle or carriage I4, the individual operations of these front and rear linkages permitting the carriage to be inclined in either direction at an angle from zero to approximately 15 from the horizontal.
For an explanation of the operation of thisy appliance, the front link mechanism will be referred to since the similarity of the front and rear linkages and their actions will be clear. i
When actuated, the forward hand-pump 5g draws oil from the reservoir 31 which iiows under pressure through the pipe 39 to the front hydraulic-cylinder 24, the piston-rod 26 of which therefore applies force to the bell-crank I9 at the point 21 where it is pivoted, the cylinder being hinged at point 25 around which it pivots.
This action of the piston-rod causes an upward motion of the registered points I1 of the bellcrank I9 by virtue of the constraint exerted on the part I9 at the points 2i bylinks 22 pivoting about the points 23 on the chassis of the vehicle and by the constraining eiect of links 3i turning about their points 33 on the chassis.
'I'he paths of travel of the aligned points I'I oi the carriage are those of registered arcs with the maior portion ot the displacement vertically upward.
Such registered points I'I of the bell-crank frame I9 are two supporting locations for the load-carriage I 4, the other component of the load being lifted by actuation of pump 35 at points I1 on the bell-crank I9 in the rear linkage. and, due to the relation of the front and rear points I1, I1 through the carriage I4, the paths of these two parts are similar.
The two pumps 35 and 39 are each equipped with manually-operated release-valves which permit lowering of the carriage or saddle of the device in the conventional manner when required, this being accomplished by allowing the oil in the two cylinders to flow back to the oil reservoir 31.
From the foregoing description no dimculty will be encountered in understanding the mode oi.' operation of the type of mechanism illustrated in Figures 6 to 8 inclusive it being apparent that the control of the movement of the front part of 'the load carriage instead of being brought about by the pair of links 3|, 3| is governed by the travel of the two rollers on the bell-crank member II9 in their guides Il, 4I.
1 In a load-liftingappliance including a vehicle chassis base, a load-carriage'and means to raise and lower said carriage with relation to said 5 base, the novel improvement being that said carriage raising-and-lowering means includes in means fulcrumed on the corresponding front and rear portionsl of said carriage, a pair oi independent hydraulic operating-means both hinged on and near the center of the length of said base, one of said hydraulic-means' facing forwardly and hinged on said front bell-crank means, and the other hydraulic-means facing rearwardly and hinged on said rear bell-crank means, front links hinged at one end on said base and hingedat l carriage with relation to said base, the novel improvement being that said carriage raising-andlowering means includes in combination front and rear bell-crank means fulcrumed on the corresponding portions of said carriage, independent hydraulic operating-means hinged to said front and rear bell-crank means and to said base, links hinged to said front and rear bell-crank means and to said base, and means governing the path of upward and downward travel of an end-portion of said carriage including means aiording sliding engagement of the bell-crank means of said end-portion with said base.
WILLIAM A. ROSS.
REFERENCES CITED The following references are of record in the ille of this patent:
UNITED STATES PATENTS Number Name Date 2,039,896 Green May 5, 1936 2,219,525 Maxon Oct. 29, 1940 2,281,595 Plant' et al. May 5, 1942 2,340,764 Makaroil. Feb. 1, 1944 FOREIGN PATENTS Number Country Date 190,073 France I Sept. 2, 1935