Electric lift truck body construction

• US 4,026,378 A
• Filed: 11/28/1975
• Issued: 05/31/1977
• Est. Priority Date: 11/28/1975
• Status: Expired due to Term

• Current Assignee: Clark Equipment Company (Doosan Heavy Industries and Construction Company Limited)
• Original Assignee: Clark Equipment Company (Doosan Heavy Industries and Construction Company Limited)
• Inventors: DePriester, Donald J.
• Primary Examiner(s): Peters, Jr., Joseph F.
• Assistant Examiner(s): Mitchell, David M.
• Application Number:
  US05/636,246
• Time in Patent Office: 550 Days
• Field of Search: 180/68.5, 280/755, 280/756, 280/759, 105/50, 105/51, 214/127, 214/DIG. 7
• US Class Current: 180/68.5
• CPC Class Codes: B60K 1/04 of the electric storage means for propulsion exchanging batteries for electric propulsion of vehicles B60L53/80; for auxiliary purposes only B60R16/04; supplying batteries to, or removing batteries from, vehicles B60S5/06
• CPC Class Codes: B66F 9/07531 Battery compartments
• CPC Class Codes: B66F 9/07554 Counterweights
• CPC Class Codes: B66F 9/07572 Propulsion arrangements
• CPC Class Codes: Y10S 414/127 Handling vehicles with overhead guard for operator

Abstract

A battery powered lift truck of the sit-down type in which two main power source batteries are located in a stepped compartment so that the forward battery is supported at a lower elevation than the rear battery. The lower elevation of the forward battery enables relatively increased stability by lowering the center of gravity of the lift truck, while the higher elevation of the rear battery is effected by locating a horizontal counterweight in an elevated position above the rear steer axle and linkage and using it as the rear battery platform, whereby to effect a relatively short length truck with adequate stability and a relatively short turning radius. An overhead guard is relatively short in length which enables the direct installation and removal of both batteries without detaching or dismounting the guard from the truck.

Claims

1. In an electric lift truck of the sit-down rider type having rear steer wheels and a transverse steering axle, a battery compartment, an operator'"'"'s station located forwardly of said battery compartment, and first and second main power source batteries located in forward and rearward portions of said compartment, said compartment including a substantially horizontal and longitudinally extending battery support platform and substantially horizontal and longitudinally extending counterweight means located and supported upon the rear portion of said platform, said first battery being located and supported upon the forward portion of said platform at a relatively low elevation in said compartment and said second battery being located and supported upon said counterweight means at an elevation higher than said first battery means.

2. An electric lift truck as claimed in claim 1 wherein said counterweight means is located above the steering axle.

3. An electric lift truck as claimed in claim 1 wherein an overhead guard extends over the operator'"'"'s station and is connected both at the front and middle portions of the truck, the connection at the middle portion being located adjacent the first battery whereby the relatively low elevation of said first battery enables a relatively low height of the overhead guard and of the operator'"'"'s station.

4. An electric lift truck as claimed in claim 3 wherein the connection at the middle portion is located adjacent the forward end of the first battery.

5. An electric lift truck as claimed in claim 3 wherein the batteries are removable from the compartment in the order of the second battery and the first battery, said batteries being installed in the compartment in the reverse order, without detaching the overhead guard from its connections to the truck.

6. An electric lift truck as claimed in claim 1 wherein said steer wheels are located adjacent the sides of said counterweight means, whereby the location of the platform and of the counterweight means combine with the repective low and high elevations of said batteries to enable a relatively short length and low profile truck.

7. An electric lift truck as claimed in claim 1 wherein adjustable bracket means are adapted to retain said first and second batteries in longitudinally spaced relation to each other.

8. An electric lift as claimed in claim 1 wherein vertically extending front, rear and side truck body members form with said support platform and counterweight means the battery compartment, said platform being secured to at least some of said truck body members.

9. An electric lift truck as claimed in claim 1 wherein said counterweight means is of a generally T-shaped configuration.

10. An electric lift truck as claimed in claim 1 wherein said platform is shaped in the area of said steer wheels to permit dirigible movement thereof.

11. An electric lift truck as claimed in claim 9 wherein a pair of mud shields are secured in the battery compartment to extend over the steer wheels on opposite sides of said counterweight means and in substantially coplanar relation therewith to provide additonal supporting surfaces for the second battery.

12. An electric lift truck as claimed in claim 7 wherein said bracket means are adjustable to accommodate first and second batteries of different sizes by engaging the confronting corner portions of the respective batteries.

13. An electric lift truck as claimed in claim 1 wherein said steer wheels are located adjacent the sides of said counterweight means, whereby the position of the counterweight means enables a relatively short truck length and turning radius, and the relatively low elevation of said first battery enables a relatively low center of gravity and profile of the operator'"'"'s station.