ARRANGEMENT FOR STABILIZATION OF TRUCKS

• US 3,630,317 A
• Filed: 10/24/1969
• Issued: 12/28/1971
• Est. Priority Date: 10/16/1968
• Status: Expired due to Term

• Current Assignee: Jacobsson Knut Folke
• Original Assignee: Jacobsson Knut Folke
• Inventors: JACOBSSON KNUT FOLKE
• Application Number:
  US04/869,208
• Time in Patent Office: 795 Days
• US Class Current: 187/223
• CPC Class Codes: B66F 17/003 for fork-lift trucks
• CPC Class Codes: B66F 9/07559 Stabilizing means

Abstract

A truck equipped with lifting means at the front end thereof, has means for stabilizing the horizontal position of the truck and means controlled by the movement of said lifting means for activating or deactivating said stabilizing means.

Claims

1. System for the stabilization of trucks of the front endloading type, equipped with lifting means on a chassis for movement in a substantially vertical direction and located at said front end of the truck, which is arranged to support and/or counterbalance the load in such a way that the equilibrium of the truck is not changed, when the load is raised, comprising truckstabilizing means mounted on said truck, power means for operating said stabilizing means, a first control device mounted on said truck and connected to said power means and capable of activating the same to bring the stabilizing means into its activated position when the lifting means under an upwards movement have reached a predetermined first level relative to the chassis and a second control device mounted on said truck and connected to said power means and capable of activating the same to bring the stabilizing means into a deactivated position when the lifting means under a downwards movement have reached a predetermined second level wherein the activation of said first and second control devices in response to the vertical position of the lifting means automatically contrOl the activation of said power means, said two levels are positioned at a given distance relative to each other with the second level being below the first level.

2. System according to claim 1, including a third control device mounted on said truck and connected to said lifting means and to said stabilizing means and capable of preventing said lifting means from moving in an upwards direction when they have reached a predetermined third level relative the chassis when said stabilizing means are indicated to be in an unactivated position and said third level is positioned above said first level.

3. System according to claim 1, wherein each of said control devices comprise an electrical switch, a cam for operating said switches when said lifting means have reached their respective predetermined levels, an electrically controlled valve connected to said switches, a pressure pump for supply fluid to said power means and said valve controlling the flow of said fluid whereby said first control device will force the same to activate the stabilizing means and said second control device will deactivate the stabilizing means.

4. System according to claim 2, wherein each of said control devices comprise an electrical switch, a cam for actuating said control device when said lifting means have reached the respective predetermined levels, an electrically controlled valve connected to said switch, a pressure pump for supplying fluid to said power means and said valve controlling the flow of fluid whereby said first control device will force the same to activate said stabilizing means, said second control device will deactivate said stabilizing means and said third control device will control the flow of fluid to said lifting means.

5. System according to claim 4, including a hydraulic system comprising a pump for said fluid, and electric motor for driving said pump, a conduit leading from the pressure side of said pump, a first valve in said conduit, tended for the supply of current to the first electrically controlled valve and further arranged to maintain open the circuit intended for the supply of current to said motor only when a certain weight of the load is exceeded, irrespective of the position of the switch arrangements actuated by said lifting means and said stabilizing means.