DE1918385U - LOWERING DEVICE ON HYDRAULIC LIFTING EQUIPMENT, IN PARTICULAR LIFTING PLATFORMS FOR CARS. - Google Patents

Description

U! R. Winter π / Wi / §3j * .gr er

Patent engineer ^u '** ■ » UJ

Bremen 1, Emil-Trir.kler-Str.S Phone; 230627

FW 304-5 a Bremen, the $. May 1965

United Flugtechnische Werke Limited liability company formerly "Weser" Flugzeugbau / Foeke Wulf, Bremen Airport, Hünefeldstrasse 1-5

Lowering device on hydraulic lifting devices, especially lifting platforms for cars

The subject of the renewal is a lowering device on hydraulic lifting devices, in particular car lifting platforms, with only one pressure medium inlet and outlet to and from the lifting cylinder and connected to this line between the motor pump and the lifting cylinder housing Branch line with manually operated lowering valve for releasing the lifting oil from the lifting cylinder when lowering the lifting piston.

Known hydraulic lifting devices, especially car lifts, have the disadvantage that when they burst the pressure oil line or if the lowering valve and the like fail, the lifting piston and the lifted lift suddenly and too quickly fall, causing the area People on the lift are at risk and damage something that has just been lifted (car) can be.

In order to achieve greater safety against such dangers on hydraulic lifting devices, especially car lifts, the invention provides that for each lowering the operator (simultaneously) two Must operate valves, which largely limits errors due to carelessness when lowering the lifting equipment will.

In addition, safety devices known per se are installed on lifting devices during firing in such a way that This also increases the security against undesired too fast lowering of a lifting platform, for example during Rupture of the pressure oil line or failure of the lowering valve was achieved.

The new double-secured lowering device on hydraulic Lifting devices, in particular car lifts with only one pressure medium supply and discharge line to and from the lifting cylinder and a branch line connected to this line between the motor pump and the lifting cylinder housing with manually operated lowering valve to drain the Lifting oil from the lifting cylinder when lowering the lifting piston is characterized in that in the pressure oil supply and -Deduction of a spring loaded, known check valve, which during the lifting process that of the running motor pump in the direction of the lifting cylinder Flowing pressurized oil through its pressure with the lift of the check valve cone against its lower back pressure lets through and when the motor pump is stopped by the now predominant check valve spring pressure closes automatically, according to the invention built directly on or in the lifting cylinder housing without an intermediate pipe or is installed and for lowering the reciprocating piston by overcoming the valve spring pressure and lifting the check valve cone is opened by the thrust of an auxiliary piston built into the check valve housing, if this auxiliary piston, after opening the known per se manually operated lowering valve, with pressurized oil via a special pressurized oil supply line through a manually operated Pressure oil piston is loaded in the pressure cylinder of an unlocking valve.

In the drawing is an embodiment of the hiring shown.

E ¹ Ig. 1 shows schematically or in partial section the arrangement of the most important parts of a lifting device, in particular a car lift, with am

Lift cylinder housing with a new type of non-return valve directly attached.

-3 -

Pig. 2 shows, in longitudinal section, a spring-loaded check valve on the Hub.ylindergeli.ause with im Check valve housing additionally built-in auxiliary piston for oil pressure internal actuation (by, the manually operated pressure piston of a release valve).

lig. 3 shows a release valve in cross section.

In the construction of the lifting system according to the lig. 1 »2 and 3 to lift the load of a motor vehicle to be lifted with the lifting piston 7 in the lifting cylinder housing 6 is from Oil collecting vessel 15 when turning on, the motor pump 5 pressurized oil via the pipeline 1, with the lowering valve 10 closed by hand in the branch line 14 to the oil collecting tank 15> into the interior of the on or in the lifting cylinder housing 6 attached or built-in check valve housing 8 is pumped, which oil when the overpressure rises The valve cone 4 of the check valve lifts against the (closing) pressure of the two check valve springs 2 and 3 (for increased security against breakage, two leathers made of corrosion-resistant material and with different Winding sense wound) and in the lifting cylinder housing 6 (without an endangered intermediate pipe) directly flows in and in this the reciprocating piston 7 raises until the motor pump 5 is turned off or a known per se (not shown) stroke limitation end stop is reached, in which latter case at about still motor pump 5 not switched off, the pressure oil via a known safety valve 16 in the pressure oil line 1 via its drain pipe 17 into the oil collecting tank $ 1 is reclaimed.

If the motor pump 5 at a desired lift height of Manually switched off or switched off, then the reciprocating piston 7 stops immediately and the check valve springs Press 2 and 3. Open the check valve cone 4 immediately the check valve seat 18, so that now the check valve 4, 18 is automatically closed The oil flows back out of the lifting cylinder 6 and thus a

wavy or unintentional sinking, (also "with a Breakage of the pressure oil line 1 or in the event of failure or accidental opening of the manually operated lowering valve 10) of the reciprocating piston 7 cannot (yet) occur.

The lowering of the piston 7 ^ it of the lift and The load on it is only possible if the Operator of the hydraulic lift other than opening of the manually operated lowering valve 10 additionally the pressure oil auxiliary piston 12 in the (previously from an assigned Oil reservoir 21 via an inflow opening 22. automatically filled) pump cylinder 13 of the unlocking valve pushes in and presses oil therefrom via a special oil line 11 onto the auxiliary piston 9 in the check valve housing, this by overcoming the counter pressure of the auxiliary piston spring 19 via an intermediate pin 20 the valve cone 4 of the check valve from its seat 18 overcoming the check valve peder pressure 2, 3 lifts off, so that only now the pressure oil from the lifting cylinder 6 with the now deliberate lowering of the Piston 7 & it of the lift and its load, into the Ö1-0U- and drain pipe 1 flow back and over their Branch line 14 through the manually opened lowering valve 10 can flow into the oil collecting vessel 15.

One or more reciprocators can be operated in the same way.

When several lifting devices or lifting platforms are collapsed on a switching unit, as it can be useful in factories, the pressure oil is additionally via a shuttle valve (e.g. rotatable and adjustable by hand) with a corresponding number of connected Oil lines (1) to each lifting cylinder 6) of the various Managed lifts, but each of them lifts (on the central switchgear) has its own locking valve (.12, 13) must have, which when lowering through a lowering valve 10 of the relevant connected lifts each has to be operated separately, so here, too, double safety when lowering.

Claims (2)

Protection requirementsGlie 1 · Lowering device on hydraulic lifting devices in particular Autenebetoiüinen with only one pressure jacket Zti- and Derivation to and from the lifting cylinder and on this line between the motor pump and the lifting cylinder housing;, connected Branch line with Senivantil in the pressure oil line to drain the Hubil "when lowering the Reciprocating piston, characterized" that the lowering valve consists of a check valve known per se with a spring-loaded valve cone (4) and is arranged in such a way that the pressure oil flows against the spring load (2, 3) and valve cone during the lifting process and the valve cone at the end of the hoof process automatically closes, and that a Valve cone 4) spring-loaded elastic acting in the direction of the opening Auxiliary piston (9) is provided, which by means of a manually operated hydraulic linkage can be influenced 2. Lowering device according to Anspruoh I, characterized in that ier conical valve body (4) and the ikn influencing auxiliary piston ($) with the involvement of a DruckülDertragungsstange with Zw i se tacking pin (2o) to each other axially in buckets for the valve cone (4) and for the Hilfsk®l "ben {§} common housing (8) are arranged. al ·! Dta »Umflöge (tud Schalwii« pr | Hf to wtoW fingoftware »; si» w * «cW« n * r W «* - 4» uraprflngtfa submitted unferiogenes ** In rich UnterJogen there are Io the Aroteoten. They give everyone »« Ληβ Modiweif a * racHNtohen Intaressae g * büiii »i» fnH «Ineawsh« who * «. Upon request wenia n W * ™| « * ^Sptl ^? ^{te < l} l iu «ton ObHoNn Pmbe · g« Ntat. OmlselHi PeMOtM,