US2998143A - Lever beam of a loading apparatus - Google Patents

Description

Aug. 29, 1961 A. E. SUNDIN 2,998,143

LEVER BEAM OF A LOADING APPARATUS Filed May 27, 1958 2 Sheets-Sheet 1 mmvrog Aug. 29, 1961 A. E. SUNDIN 2,998,143

LEVER BEAM OF A LOADING APPARATUS Filed May 27, 1958 2 Sheets-Sheet 2 2,998,143 LEVER BEAM OF A LOADING APPARATUS Anders Erik Snndin, Hndiksvall, Sweden, assignor to Hydranliska Industri Aktiebolaget, Hudiksvall, Sweden, a corporation of Sweden Filed May 27, 1958, Ser. No. 738,188 Claims priority, application Sweden May 28, 1957 3 Claims. (Cl. 212-35) The present invention relates to improvements in a loading apparatus which is especially adapted to be arranged on a lorry and which is provided with a lever beam swingable in vertical and horizontal directions relative to the body of the loading apparatus, the movement in vertical direction at least partially caused by means of an hydraulic device comprising a vertical pressure cylinder and a pressure piston. The latter is at its upper end hinged to the lever beam in such a way that the latter forms a two-armed lever the arms of which having different lengths a draw rod being hinged to the shorter arm of the lever beam.

The main feature of the invention is that said draw rod vertically passes through a guiding device on a socket carried at the upper end of the vertical pressure cylinder and turnable by means of an hydraulic device, said guiding device being provided with a stopper for limiting the movement upwards of the draw rod together with the lever beam. The swinging in a horizontal plane of the lever beam is obtained by turning said socket, provided with said guiding device, under intermediary of said draw rod. This device involves inter alia the following advantages. The construction of the loading apparatus is simplified as, according to the invention, it is not necessary to provide the pressure piston, movable in vertical direction, with means directly forcing it to turnabout its own axis. Such a construction is rather complicated. The draw rod makes it further possible to raise the lever beam to an extent which has not been possible to reach with previously known constructions.

The invention will now be elucidated with reference had to the accompanying drawings. In the drawings:

FIG. 1 is a side elevation of a loading apparatus according to the present invention having. its lever beam directed rearwards,

FIG. 2 is a similar side elevation of the upper part of the loading apparatus showing the lever bearmswung upwards,

FIG. 3 is a partly broken rear view of the loading apparatus showing the lever beam folded,

FIG. 4 shOWS a horizontal section through the apparatus on the line IVIV in 'FIG. 3, and

FIG. 5 shows on an enlarged scale a partly broken side elevation of the socket having a guide device, involved in the loading apparatus.

On the frame of the chassis of a lorry is close behind its driving compartment 1 arranged a box-formed rail 2 which forms a container for the pressure medium, preferably oil, which hydraulically actuates the loading apparatus. A pressure cyilnder 3, serving as a vertical column or a body, has its lower end arranged at the rail 2, and at the upper end of the cylinder 3 there is arranged a device 4 for turning the lever beam 5 of the loading apparatus in a horizontal plane. Said device 4 comprises inter alia two horizontal pressure cylinders 6, 7 having pistons movable in them and a rack-gear (not shown in the drawings) arranged between said movable pistons. The rack-gear cooperates with a gear wheel 8 being journalled on the pressure cylinder 3. Said gear wheel 8 is arranged at the lower end of a socket 9 which is journalled on the upper end of the pressure cylinder 3. Said socket 9 is provided with a box-formed guiding device 10 which from above is passed through by a draw nited States Patent 0 2,998,143 Patented Aug; 29, 1961 rod 11 being at its lower end provided with a hook 12 adapted to cooperate with a stopper 13 which is laterally disposed in the guiding device 10. The draw rod 11 is at its upper end hinged to the shorter arm 15 of the lever beam 5 by means of a bolt 14. The draw rod 11 is at its upper end slightly curved and has a T-shaped cross section. The lateral stem 16 of said T passes between the two side walls 17 of the guiding device 10. The longitudinal stem 18 of the draw rod 11 abuts with its free longitudinal edge against a guiding bolt 19 extending between said walls 17. The lateral stem 16 of the draw rod 11 extends with its lower end 20 down beyond the hook 12 in such a way that the guiding is rendered effective also in the upper-most position of the draw rod 11.

A pressure piston 21 is movably arranged in the vertical pressure cylinder 3, and said pressure cylinder 21 is at its upper end hinged to the lever beam 5 by means of a bolt 22 in such a way that said lever beam 5 forms a twoarmed lever. The lever beam 5 comprises a part 23 situated close to the body of the loading apparatus and a rocker arm 24 which is hinged to said part 23 and at its outer end provided with a loading tool (not shown). The joint between the rocker arm 24 and the part 23 of the lever beam 5 comprises two coaxial pivots 25 laterally somewhat spaced from each other. A pressure cylinder 27 having a pressure piston is swingab'ly carried with one end around a bolt 26 in the part 23 of the lever beam 5. The piston rod 28 of the pressure piston in the pressure cylinder 27 is hinged to the rocker arm 24 by means of a bolt 29 at a place situated in the vicinity of the pivots 25 but underneath the latter, said piston rod 28 passing in the space between said pivots 25 at the swinging up of the rocker arm 24.

The means for controlling the feeding of pressure medium to the different pressure cylinders 3, 6, 7, and 2.7 are shown only diagrammatically in the drawings. The hydraulic pump (not shown) is preferably coupled to the transmission machinery of the lorry. The pressure:

side of the pump communicates with a control valve 30 the valve'body of which being adjustable to different control positions. The valve 30 communicates through a conduit 31 with the outer end of the left hand pressure cylinder 6 (FIG. 3) and through a conduit 32-with the outer end of the right hand pressure cylinder 7. The valve 30 communicates further through a conduit (not shown) with the vertical pressure cylinder 3. The control valve 30 communicates also with the pressure cylinder 27 on the lever beam 5 by means of a flexible conduit 33.

The lever beam 5 of the loading apparatus is in FIG. 3 shown in its folded position, i.e. in its position during transport with the vehicle. When the loading apparatus shall be used, the control valve is adjusted in such a way that oil is pressed into the vertical pressure cylinder 3. The pressure piston 21 is thereby forced upwards and brings along the draw rod 11. When the hook l2 abuts against the stopper 13, the lever beam 5 is raised during continued moving upwards of the pressure piston 21. The control valve is simultaneously adjusted in such a way that pressure medium is pressed into the pressure cylinder 27 which results in a turning of the rocker arm 24 in clock-wise direction to the position shown in FIG. 1. At a continued pressing of oil into the pressure cylinder 3, the lever beam 5 is further raised, for instance to the position shown in FIG. 2. When the lever beam 5 is completely swung up, there is obtained a considerable lifting height. A turning of the lever beam 5 in a horizontal plane can easily be prosecuted due to the hydraulic turning device 4 which causes a turning of the socket 9 with the guiding device 10 transmitting the motion to the lever beam 5 via the draw rod 11.

The returning of the lever beam 5 to its initial position is of course performed in the opposite direction in relation to what is described in the aforesaid. As obvious from FIG. 3, the lever beam 5, when folded to gether and being in its lowered position, requires a rather small space. In operative position the loading apparatus has a considerable service range, and it can With its loading tool reach the vicinity of the body of the loading apparatus thanks to the rocker arm 24.

The shown and described embodiment is to be regarded only as an example, and different portions of the loading apparatus may be varied in many ways within the scope of the invention. Thus, the performance of the lever beam and the different hydraulic operating means are independent of the invention. The invention also involves a loading apparatus having an undivided lever beam, i.e. a not foldable lever beam.

What I claim is:

1. A loading device for a lorry and comprising a lever beam swingable vertically and horizontally with respect to the lorry, and having long and short arms and a fulcrum portion intermediate the outer ends of the beam; an hydraulic device for at least partially moving the beam, said device including a vertical pressure cylinder mounted substantially fast with respect to the lorry; a piston in the cylinder and provided with an upwardly extending rod having an upper end portion; hinge means for connecting the upper end portion of the rod to the fulcrum portion of the beam; an off-set socket member mounted on the upper end of the cylinder for turning about the axis of the cylinder; a generally vertical draw rod slidably passing through the socket member and having the upper end thereof pivotally mounted on the outer end of said short arm; guide means in the socket memher for guiding the rod through the socket member, and means on the draw rod and socket member for limiting upward movement of the draw rod through the socket member.

2. A loading device for a lorry and comprising a lever beam swingable vertically and horizontally with respect to the lorry, and having long and short arms and a fulcrum portion intermediate the outer ends of the beam; an hydraulic device for at least partially moving the beam, said device including a vertical pressure cylinder mounted substantially fast with respect to the lorry; a piston in the cylinder and provided with an upwardly extending rod having an upper end portion; hinge means for connecting the upper end portion of the rod to the fulcrum portion of the beam; an off-set socket member mounted on the upper end of the cylinder for turning about the axis of the cylinder; a generally vertical draw rod slidably passing through the socket member and having the upper end thereof pivotally mounted on the outer end of said short arm; guide means in the socket member for guiding the rod through the socket member; means for turning the socket member to carry with it the draw rod and beam, and means on the socket member and draw rod to limit upward movement of the draw rod through the socket member.

3. A loading device for a lorry and comprising a lever beam swingable vertically and horizontally with respect to the lorry, and having long and short arms and a fulcrum portion intermediate the outer ends of the beam; an hydraulic device for at least partially moving the beam, said device including a vertical pressure cylinder mounted substantially fast with respect to the lorry; a piston in the cylinder and provided with an upwardly extending rod having an upper end portion; hinge means for connecting the upper end portion of the rod to the fulcrum portion of the beam; an oiT-set socket member mounted on the upper end of the cylinder for turning about the axis of the cylinder; means for turning the socket member; a generally vertical draw rod slidably passing through the socket member and having the upper end thereof pivotally mounted on the outer end of said short arm; guide means in the socket member for guiding the rod through the socket member, and means on the socket member and draw rod to limit upward movement of the draw rod through the socket member; said draw rod being generally of T-shape cross section and said guide means being a pair of parallel horizontal rods, one parallel with and engaging the outer face of the flange forming the cross of the T and the other engaging the edge of the web, said socket member including a pair of vertical plates carrying the parallel rods and engaging on opposite edges of the flange so that turning of the socket member causes the draw rod to gyrate.

References Cited in the file of this patent UNITED STATES PATENTS 2,605,002 Graves July 29, 1952 2,828,867 Frisk Apr. 1, 1958 FOREIGN PATENTS 149,326 Sweden Mar. 22, 1955 OTHER REFERENCES Sundins German application, Serial No. Hli,823, printed August 2, 1956, Re 35b, Gr 311, 3 shts. drawings, 4 pp. specification.

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