WO1980001708A1 - Hydraulic lifting system - Google Patents

Hydraulic lifting system Download PDF

Info

Publication number
WO1980001708A1
WO1980001708A1 PCT/DK1980/000011 DK8000011W WO8001708A1 WO 1980001708 A1 WO1980001708 A1 WO 1980001708A1 DK 8000011 W DK8000011 W DK 8000011W WO 8001708 A1 WO8001708 A1 WO 8001708A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve body
chain
tipping
manoeuvre
Prior art date
Application number
PCT/DK1980/000011
Other languages
French (fr)
Inventor
V Kristensen
Original Assignee
V Kristensen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by V Kristensen filed Critical V Kristensen
Publication of WO1980001708A1 publication Critical patent/WO1980001708A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
    • B60P1/04—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element
    • B60P1/16—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element actuated by fluid-operated mechanisms
    • B60P1/162—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element actuated by fluid-operated mechanisms the hydraulic system itself

Definitions

  • the invention relates to a hydraulic lifting system especially for the tipping of truck " bodies and being of the character in which hydraulic oil is supplied to a tipping cylinder through a stop valve, the valve body of which is connected by e.g c a chain to the movable piston of the cylinder in such a manner that the valve body against the force of a spring is conveyed to rest against a valve seat so that the valve will close immediately before the highestpoint of the tipping piston is reached.
  • the stop valve body can e.g. be connected to one end of a chain, the other end of which is fastened to the lower side of the dump body, in that the chain is exactly so long that the valve is closed and will pre ⁇ vent admission of oil to the cylinder when the dump body is in its outer position.
  • a hydraulic system of the described character usually incorporates also an overpressure valve, in ⁇ tended to ensure that the pressure in the cylinder shall not exceed a set value.
  • the object of the present invention is to devise a hydraulic lifting system of the described character being self-releasing, but in which the stop valve is of a simpler and accordingly more inexpensive construction than hitherto known.
  • valve will open when the oil supply pressure is lowered, be ⁇ cause the valve body is not as is the case of known stop valves unreleasably connected to the movable piston in the tipping cylinder.
  • stop valve fur ⁇ thermore acts as overpressure valve, as the spring force on the manoeuvre rod is adjusted in such a manner that an overpressure will force the rod away from the valve body, so that the latter is free to close the valve.
  • the valve shown in ;the drawing is Jin the hydraulic lifting system according to the invention inserted bet ⁇ ween a manoeuvre valve and a tipping cylinder not shown in the drawing.
  • the valve consists of a valve casing 1, in which there is cylinder-shaped bore 2 with an inlet opening 3,
  • OMPI that is connected to the not shown manoeuvre valve.
  • the other end of the bore 2 is closed by way of e.g. screwed- in end bottom 4.
  • a reciprocating manoeuvre rod 5 By means of a spring 6 tightened in between the end bottom 4 and a sleeve on the rod 5 the manoeuvre rod is pressed against the inlet opening 3 of the bore.
  • the rod 5 is thus stretching through a ring-shaped valve seat 7 in the bore and preventing that the valve body 8 will reach the valve seat and thereby close the valve.
  • a chain 10 To the end of the manoeuvre rod 5 protruding out of the casing is fastened e.g. a chain 10, the other end of which is fastened to the lower side of a truck dump body, which is to be lifted.
  • the chain 10 When the dump body reaches its outer posistion the chain 10 will against the effect of the spring 6 pull the manoeuvre rod 5 away from the valve body 8, so that the latter by the oil pressure is acti ⁇ vated for interaction with the valve seat 7, whereby the valve will close.
  • valve body 8 is spherical. In this manner or other suitable manner is ensured that the surface of contact between the valve body and the manoeuvre rod 5 is smaller than
  • OMPI the bottom surface of the rod.
  • the part of the manoeuvre rod 5 remaining outside the surface of contact is con ⁇ sequently exposed direct to the oil pressure in the bore.
  • an overpressure will force the manoeuvre rod 5 against the force of the spring away from the valve body 8 and the latter will close ' the valve.
  • the shown shop valve will accordingly act also as overpressure valve, which means that a separate overpressure valve in the system can be left out.

Abstract

Hydraulic lifting system especially for the tipping of truck bodies and being of the character in which hydraulic oil is supplied to a tipping cylinder through a stop valve, the valve body (8) of which is connected by e.g. a chain (10) to the movable piston of the cylinder in such a manner that the valve body against the force of a spring (6) is conveyed to rest against a valve seat (7) so that the valve will close immediately before the highest point of the tipping piston is reached. The chain (10) is connected to one end of a reciprocating manoeuvre rod (5) which by the said spring (6) is squeezed to a position from which it will prevent the valve body (8) to reach the valve seat (7), but by a pull of the chain will be led away from the valve seat. The valve body (8) and the manoeuvre rod (5) can be designed in such a manner that their mutual contact surface is smaller than the end surface of the manoeuvre rod turning towards the valve body, so that the oil can be pressed against the end surface.

Description

HYDRAULIC LIFTING SYSTEM
The invention relates to a hydraulic lifting system especially for the tipping of truck "bodies and being of the character in which hydraulic oil is supplied to a tipping cylinder through a stop valve, the valve body of which is connected by e.gc a chain to the movable piston of the cylinder in such a manner that the valve body against the force of a spring is conveyed to rest against a valve seat so that the valve will close immediately before the highestpoint of the tipping piston is reached.
The stop valve body can e.g. be connected to one end of a chain, the other end of which is fastened to the lower side of the dump body, in that the chain is exactly so long that the valve is closed and will pre¬ vent admission of oil to the cylinder when the dump body is in its outer position.
By elder known systems it is necessary to open the stop valve manually in order to empty the tipping cylinder. For this purpose can e.g. to the stop valve - body be fastened a wire pull. This involves, however, a risk that the stop valve can be opened unintentional¬ ly, whereby its function - to stop the tipping movement - is prevented. In case the supply of oil to the tipping cylinder is not closed, the cylinder unit could be destroyed.
Consequently a use of a two-way-flow stop valve rendering the system self-releasing has been suggested, so that direct manual control of the stop valve is un¬ necessary and impossible. Such a valve is for instance known from specification to Danish patent No. 121841 and is comparatively complicated.
A hydraulic system of the described character usually incorporates also an overpressure valve, in¬ tended to ensure that the pressure in the cylinder shall not exceed a set value.
The object of the present invention is to devise a hydraulic lifting system of the described character being self-releasing, but in which the stop valve is of a simpler and accordingly more inexpensive construction than hitherto known.
This is according to the invention achieved in that the chain is connected to one end of a reciprocating manoeuvre rod which by the said spring is squeezed to a position from which it will prevent the valve body to reach the valve seat, but by a pull of the chain will be led away from the valve seat.
By the said construction is achieved that the valve will open when the oil supply pressure is lowered, be¬ cause the valve body is not as is the case of known stop valves unreleasably connected to the movable piston in the tipping cylinder. In designing the valve as specified in Claim 2 is further achieved that the stop valve fur¬ thermore acts as overpressure valve, as the spring force on the manoeuvre rod is adjusted in such a manner that an overpressure will force the rod away from the valve body, so that the latter is free to close the valve.
The invention will be described in detail below in relation to the drawing showing a section through the valve applied in the lifting system according to the invention.
The valve shown in ;the drawing is Jin the hydraulic lifting system according to the invention inserted bet¬ ween a manoeuvre valve and a tipping cylinder not shown in the drawing.
The valve consists of a valve casing 1, in which there is cylinder-shaped bore 2 with an inlet opening 3,
OMPI that is connected to the not shown manoeuvre valve. The other end of the bore 2 is closed by way of e.g. screwed- in end bottom 4. Through this end bottom 4 is for sealing purposes inserted a reciprocating manoeuvre rod 5. By means of a spring 6 tightened in between the end bottom 4 and a sleeve on the rod 5 the manoeuvre rod is pressed against the inlet opening 3 of the bore. The rod 5 is thus stretching through a ring-shaped valve seat 7 in the bore and preventing that the valve body 8 will reach the valve seat and thereby close the valve.
On the side of the valve seat turning from the in¬ let opening 3 an outlet channel 9 will open into the bore 2, which said channel is connected to the not shown tipping cylinder.
To the end of the manoeuvre rod 5 protruding out of the casing is fastened e.g. a chain 10, the other end of which is fastened to the lower side of a truck dump body, which is to be lifted. When the dump body reaches its outer posistion the chain 10 will against the effect of the spring 6 pull the manoeuvre rod 5 away from the valve body 8, so that the latter by the oil pressure is acti¬ vated for interaction with the valve seat 7, whereby the valve will close.
When the oil pressure is lowered by means of the manoeuvre valve the pressure in the outlet channel 9, possibly against the force of a relatively weak spring inserted between the inlet opening 3 and the valve body 8, press the valve body 8 away from the seat and effect that the valve will open and the tipping cylinder auto¬ matically relieved. Hereby the dump load is lowered, and the pull from chain 10 will cease, so that the spring 6 will lead the manoeuvre rod 5 back to the initial posi¬ tion shown in the drawing.
In the embodiment shown in the drawing the valve body 8 is spherical. In this manner or other suitable manner is ensured that the surface of contact between the valve body and the manoeuvre rod 5 is smaller than
OMPI the bottom surface of the rod. The part of the manoeuvre rod 5 remaining outside the surface of contact is con¬ sequently exposed direct to the oil pressure in the bore. By a suitable choice of the force of the spring 6 and the exposed part of the end surface may be effected that an overpressure will force the manoeuvre rod 5 against the force of the spring away from the valve body 8 and the latter will close' the valve. The shown shop valve will accordingly act also as overpressure valve, which means that a separate overpressure valve in the system can be left out.
OMPI

Claims

P A T E N T C L A I M S
1. Hydraulic lifting system especially for the tip¬ ping of truck bodies and being of the character in which hydraulic oil is supplied to a tipping cylinder through a stop valve, the valve body (8) of which is connected by e.g. a chain (10) to a movable piston of the cylinder in such a manner that the valve body against the force of a spring (6) is conveyed to rest against a valve seat (7) so that the valve "will close immediately before the highest point of the tipping piston is reached, c h a ¬ r a c t e r i z e d i n t h a t the chain (10) is connected to one end of a reciprocatin manoeuvre rod (5) which by the said spring (6) is squeezed to a position from which it will prevent the valve body (8) to reach the valve seat (7), but by a pull of the chain will be led away from the valve seat.
2. Hydraulic lifting system according to claim 1, c h a r a c t e r i z e d i n t h a t the valve body (8) and the manoeuvre rod (5) are designed in such a manner that their mutual contact surface is smaller than the end surface of the manoeuvre rod turning to¬ wards the valve body.
PCT/DK1980/000011 1979-02-12 1980-02-12 Hydraulic lifting system WO1980001708A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK568/79 1979-02-12
DK56879 1979-02-12

Publications (1)

Publication Number Publication Date
WO1980001708A1 true WO1980001708A1 (en) 1980-08-21

Family

ID=8095013

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1980/000011 WO1980001708A1 (en) 1979-02-12 1980-02-12 Hydraulic lifting system

Country Status (2)

Country Link
EP (1) EP0024077A1 (en)
WO (1) WO1980001708A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106438583A (en) * 2016-10-11 2017-02-22 上海航天控制技术研究所 Novel large-flow and small-inner-leakage-flow direct-acting type overflow valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE353052B (en) * 1970-05-27 1973-01-22 Soenderby H & Co Maskinfab
DE2554594A1 (en) * 1975-12-04 1977-06-08 Meiller Fahrzeuge CONTROL VALVE FOR HYDRAULICALLY ACTUATED TIPPER VEHICLES

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE353052B (en) * 1970-05-27 1973-01-22 Soenderby H & Co Maskinfab
DE2554594A1 (en) * 1975-12-04 1977-06-08 Meiller Fahrzeuge CONTROL VALVE FOR HYDRAULICALLY ACTUATED TIPPER VEHICLES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106438583A (en) * 2016-10-11 2017-02-22 上海航天控制技术研究所 Novel large-flow and small-inner-leakage-flow direct-acting type overflow valve

Also Published As

Publication number Publication date
EP0024077A1 (en) 1981-02-25

Similar Documents

Publication Publication Date Title
US4172582A (en) Reverse differential holding valve
DE1947012B2 (en) ANTI-SKID DEVICE FOR MOTOR VEHICLE BRAKES
US3228658A (en) Hydraulic lift
WO1980001708A1 (en) Hydraulic lifting system
US5584224A (en) Hydraulic systems
US2164911A (en) Valve construction
CZ286074B6 (en) Hydraulic device for controlling pressure medium flow
AU4431093A (en) Supply valve arrangement for closed center hydraulic system
US3545484A (en) Pilot-operated valve
US2655169A (en) Autoamtic unloading valve for hydraulic pumps
GB1457372A (en) Fluid-pressure regulating valve
US2675677A (en) Fluid pressure control apparatus
GB1034108A (en) Improvements in or relating to apparatus for controlling a fluid power motor
GB2308425A (en) Presure reduction valve
US3991659A (en) Fail safe apparatus for load lifts
US3133417A (en) Accumulator charging system
FR2333985A1 (en) CONTROL VALVE FOR HYDRAULICALLY ACTUATED TILTING VEHICLES
US2914037A (en) Hydraulic pumping system
US2008980A (en) Hydraulic hoist
JPS57192601A (en) Pressure device of hydraulic oil tank
GB2179107A (en) Anti-skid devices
SU783074A2 (en) Device for tilting cargo bodies of dump road train
SU1211104A1 (en) Device for dump truck body tipping
SU451554A1 (en) Crane limiting the angle of lifting the body of a dump truck
FR2413316A1 (en) Jack for raising upper deck of car transporter - has hydraulically operated safety catches which are spring loaded to hold deck in absence of pressure

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Designated state(s): AT CH DE FR GB NL SE