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Publication numberUS3269570 A
Publication typeGrant
Publication dateAug 30, 1966
Filing dateMar 12, 1965
Priority dateMar 14, 1964
Also published asDE1431698A1
Publication numberUS 3269570 A, US 3269570A, US-A-3269570, US3269570 A, US3269570A
InventorsWallberg Karl Erik
Original AssigneeKewacos Forsaljnings Aktiebola
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for fastening working tools on lifting levers of loading trucks
US 3269570 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


BY @f1/W7 MKZ/L @jaw/L;s

Aug. 3o. 1966 K. E. w


INVENTOR. @mall-01% PMM all@ United states Patent o 4 claims. (l. 214-131) The present invention relates to a device for fastening working tools on lifting levers of loading trucks, etc.

It is previously known to fasten working tools in the form of lloading buckets etc. on the lifting levers of loading trucks by means of down hitches fastened to the upper part of the working tool and hooks at the lower part of the working tool, it being possible to enter a frame articu- Alatedly connected to the lifting leve-rs and fasten it between -the hitches and the hooks. The 'fastening of the working tool to the fram-e is effected by means of a number of latch pins, which under the action of springs controllable from the drivers seat are pressed towards latch surfaces on the hooks.

It has turned out that such a fastening of the working tool to the frame by means of springs does not provide the necessary fastening, Vwhen the device is used with relatively heavy loading trucks.

One of the objects of lthe invention is `therefore to provide a fastening device, which advantageously can be used on band or 4-Wheel driven loading trucks.

According to the invention this object is substan-tially reached as each latch pin is articulatedly connected to a piston rod of a Working piston, which is movable in a compression cylinder mounted in the frame and connected to a hydraulic or pneumatic control device preferably `located at the drivers seat of the loading truck.

In this way a relatively simple but reliable fastening device is obtained, which also can be used on heavy loading trucks. In comparison with previously known fastening devices of the type mentioned above another advan tage is obtained, i.e. even if the Working tool is deformed or worn down so that the distances between the hitches and the hooks are considerably Vincreased or reduced, this is compensated by means of the variable piston stroke of the working piston.

Each hook is preferably provided with a notch, in which the free end of the latch pin can be entered and pressed by means of the working piston. The latch pin can preferably be controlled by at least one guide rail etc. It is also suitable that the latch pin is articulatedly connected to a rod, one end of which is articulatedly connected to the frame and the other end of the piston rod. The latch pin may consist of a pin movable in a guide. It is further suitable that Ithe free end of the latch pin co-operating with the hook is wedge-shaped and adapted to engage a hook provided with corresponding notch and latch surface. The working piston is preferably double-acting, and the control device is made as a double piston, which by means of a handle can be pushed in a second compression cylinder, which by tube lines is connected to the firstmentioned compression cylinder.

The invention is further described in the following in connection with accompanying drawings, which schematically and as examples -illustrate embodiments of the invention.

FIGURE 1 is a side view showing in section a frame articulatedly fastened to two lifting levers and a Working tool fastened thereto in the form of a lifting for-k only shown in part, FIGURE 2 -is a section of a control device shown on a larger scale for the Working piston shown in FIGURE 1 for fastening of the working tool to the frame,


and FIGURE 3 is a side view of another embodiment of the device shown in FIGURE 1.

In FIGURE l1 there is shown -a 4frame 1 known per se, which is fastened to two lifting levers 2, 2 of a loading truck not shown, which frame includes a bracket 3 and a compression cylinder 4 attached thereto, in which a movable double-acting piston -5 with piston rod 6 is adapted. The free end of the piston rod 6 is articulatedly connected to one end of a Irod 7, the -other end of which is ilexibly attached to a bracket 8 fastened to the frame. To the articulated arm 7 a down latch pin 9 is articulated edly connected, which is guided in a guide rail '10 attached to the yframe. The compression cylinder 4 is provided with two tube lines.11 and 1-2, |which are connected to a con-trol device I14 Ilocated at the drivers seat 1'3 (FIG- URE 2) of lthe loading truck comprising a double piston articulatedly connected to a handle 15 and designated by 16, 16.

r[the working tool shown is a lifting fork 17 which at yits upper part is provided with a number of hitches 118 and at its lower part wit-h a number of hooks 19 each having a notch 20 and a latch surface 21, in which notch 20 the -free end of the latch pin 9 is intended to engage upon fastening of the fork 17 to the frame of the lifting levers `2, 2. The frame 1 is'moreover provided with a horizon-tal rod 22, which is intended to engage the hitches 1-8 upon fastening of the working tool to the frame.

When the frame 1 in a way known per se is entered between the hitches 18 and the hooks 19, it bears against the vertical part of the lifting fork 17, after which the handle 15 (FIG. 2) for the control device 14 is turned in the direction B of the arrow. The pressure medium in the tube line 11 then pushes the working piston 5 t-o the position shown in FIG. 1, where the piston rod puts a down pressure on the latch pin 9, which is brought into the notch 20 and fastens the frame to the Ilifting fork. When the handle 1'5 is turned in the direction A of the arrow, the pressure medium in the tube line -12 pushes the piston 5 upwards, the latch pin 9 being drawn out of the notch 20 in the hook 19 and the frame 1 being released from the fork 17.`

In FIG. 3 a modified embodiment of the latch pin is shown consisting of a pin 9' running in a guide 10', the free end of which is wedge-shaped and is adapted t-o engage a hook 19 provided with a corresponding notch 20 and latch surface 21.

By the invention the advantage is also obtained that no clearance or relative movement between the latch pins 9 and 9 respectively and the hooks 19 and 19 respec tively in the fastening position can occur, as the latch pins 9 and 9 respectively, during the work of the loading truck are pressed firmly into the notch 5, 20 and 20', respectively, looseness being avoided and no essential disturbing sound between the latch pins and the ho-oks and their latch surfaces occurring any longer. As the pushing of the latch hooks 9 and 9 respectively to the notches and the latch surfaces in the respective hooks 19, 19 is hydraulic or pneumatic, all the latch pins will receive the same contact pressure and fastening effect, even if one of the latch pins should be inconsiderably deformed or for other reasons should have another fastening position than the other latch pin or pins.

The embodiments described above and shown on the drawing are of course only to be regarded as non-limiting examples, and their details can be modified in several ways within the sc-ope of the following patent claims. Thus it is possible to use, in loading trucks with hydraulic control of the lifting levers, 2 the hydraulic system that the loading truck already is provided with, the tube lines 11, I12, connected to the cylinder 4 being connected to the hydraulic system of the truck. In this case the safety valve already existing may be used at possible overload of the device.

I claim:

1. A device for fastening a working tool having at least one down hitch adjacent to the upper end thereof and at least one hook having a notch adjacent to the lower end thereof to the lifting levers of a loading machine comprising a frame articulated t-o said lifting levers, means on said frame adapted to engage the hitch on said working tool and secure said tool against movement downwardly or laterally relative to said frame, a rst cylinder connected at its upper end to said frame, a double acting piston in said first cylinder, a piston rod connected to said piston and extending downwardly beyond the lower end of said rst cylinder, means for -introducing pressure rfluid into the opposite ends of said rst cylinder to move said piston upwardly and downwardly, a latching pin con- -nected at its upper end to said piston rod and extending downwardly toward said hook, a guide for said latching pin rigidly secured to said frame, the downward and upward movement of said piston 'being suicient to engage and disengage said latching pin with and from said notch respectively.

2. A device as dei-ined in claim 1 comprising an arm articulatedly connected to said frame below said rst cylinder, said piston Irod and said latching pin being articulatedly connected to said arm.

3. A device as dened in claim 1 in which the lower end of said latching pin is Wedge shaped.

4. A device as dened in claim 1 comprising means secured to said loading machine .for controlling the supply of pressure fluid to said rst cylinder, said means cornprising a second cylinder, a double piston therein controlling outlets of pressure uid therefrom to said first cylinder and a handle for moving said double piston in said second cylinder.

References Cited by the Examiner UNITED STATES PATENTS 3,204,793 9/ 1965 Lane 214-145 FOREIGN PATENTS 91,351, 3/1958 Norway.

HUGO O. SCHULZ, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3204793 *Jun 28, 1963Sep 7, 1965Guy E LaneFront end loader automatic implement attachment apparatus
NO91351A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4251181 *Jun 27, 1979Feb 17, 1981Loed CorporationImplement coupling apparatus for boom-type vehicle
US4480955 *Feb 2, 1982Nov 6, 1984Maroochy Shire CouncilCoupling for earth moving tools etc.
US4488850 *Aug 19, 1982Dec 18, 1984J. I. Case CompanyCoupler assembly
US4663866 *Apr 23, 1985May 12, 1987Bengt KarlssonQuick coupling attachment for operating tools
US4726731 *Jun 27, 1985Feb 23, 1988Jones Paul OHitch
US4812103 *Mar 22, 1988Mar 14, 1989J. I. Case CompanyImplement-coupling assembly for material-handling apparatus
US4850790 *Jun 27, 1988Jul 25, 1989J. I. Case CompanyHydraulically actuated coupler for industrial, agricultural, or earth-moving vehicle
US4955779 *Oct 27, 1987Sep 11, 1990Jaromir Vaclav DrazilConnector
US4961681 *Dec 7, 1989Oct 9, 1990Threatt Raymond WChuck for attaching utility vehicle accessories
US5078569 *Apr 30, 1990Jan 7, 1992J. I. Case CompanyQuick attaching mechanism for a front-end loader
US5332353 *Feb 16, 1993Jul 26, 1994Wain Roy, Inc.Quick coupler for excavation equipment
US5382110 *Dec 30, 1992Jan 17, 1995Esco CorporationQuick coupling device
US5562397 *Jul 13, 1994Oct 8, 1996Clark Equipment CompanyPower actuator for attachment plate
US5685689 *Jan 3, 1996Nov 11, 1997Great Bend Manufacturing Co., Inc.Quick attach system for front end loader
US5820332 *May 2, 1997Oct 13, 1998Case CorporationHeavy duty coupler for attaching an implement to work vehicle
US6336785 *Oct 18, 1999Jan 8, 2002Nippon Pneumatic Mfg. Co., Ltd.Quick coupler for heavy equipment
US6390765Apr 10, 2000May 21, 2002Dennis J DickPower latched quick change attachment coupler for skid steer vehicles
US6431785Jun 5, 2000Aug 13, 2002Wec Co.Direct pin quick coupler
US6499904Jan 19, 2001Dec 31, 2002Nye Manufacturing Ltd.Excavator coupler using fluid operated actuator
US6619906Mar 12, 2001Sep 16, 2003Dennis J DickPower latch adapter for quick change attachment coupler
US6866467 *Nov 29, 2000Mar 15, 2005Caterpillar S.A.R.L.Hydraulically actuated quick coupling device
US7001136 *May 13, 2003Feb 21, 2006Deere & CompanyDevice for attaching an implement to a lifting unit
US7329082Sep 20, 2005Feb 12, 2008Ultra-Tach, LlcElectrically actuated attachment system for tractor front end loaders
US20040228716 *May 13, 2003Nov 18, 2004Laurent PerrinDevice for attaching an implement to a lifting unit
USRE37320Mar 16, 2000Aug 14, 2001Wec Co.Hydraulic latch pin assembly for coupling a tool to a construction equipment
USRE37339Mar 16, 2000Aug 28, 2001Wec Co.Hydraulic latch pin assembly for coupling a tool to a construction equipment
DE4312368C5 *Apr 16, 1993Sep 25, 2008Abi Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik Und Vertriebsgesellschaft MbhEinrichtung zur Befestigung von Arbeitsgeräten am Hubschlitten des Mäklers von Baumaschinen
EP0052987A1 *Nov 13, 1981Jun 2, 1982Eimco (Great Britain) LimitedA coupling mechanism
EP0058058A2 *Feb 4, 1982Aug 18, 1982Maroochy Shire CouncilQuick release and attachment assembly
EP0058058A3 *Feb 4, 1982May 18, 1983Maroochy Shire CouncilQuick release and attachment assembly
EP0306340A1 *Sep 2, 1988Mar 8, 1989Wain-Roy, Inc.Tool coupler
EP0382073A1 *Jan 31, 1990Aug 16, 1990Gehl CompanyQuick-attaching mechanism
EP0859089A1 *Feb 11, 1998Aug 19, 1998Jürgen WartholdDevice for locking or unlocking a tool on a tool holding frame of a compact loader
WO1984002152A1 *Nov 15, 1983Jun 7, 1984Fritiof HuldenA coupling means
WO1988003198A1 *Oct 27, 1987May 5, 1988Drazil, Jaromir, VaclavConnector
WO1996002706A1 *Jul 12, 1995Feb 1, 1996Clark Equipment CompanyPower actuator for attachment plate
U.S. Classification414/723, 414/697
International ClassificationB66F9/12, B66F9/065, B60P1/48, E02F3/36
Cooperative ClassificationB66F9/12, E02F3/3627, E02F3/3663, B66F9/065, E02F3/364, B60P1/48
European ClassificationE02F3/36C2V, E02F3/36C2G, E02F3/36C2M, B60P1/48, B66F9/065, B66F9/12