GB1217879A - Improvements in or relating to battery powered masted industrial trucks - Google Patents
Improvements in or relating to battery powered masted industrial trucksInfo
- Publication number
- GB1217879A GB1217879A GB4604668A GB4604668A GB1217879A GB 1217879 A GB1217879 A GB 1217879A GB 4604668 A GB4604668 A GB 4604668A GB 4604668 A GB4604668 A GB 4604668A GB 1217879 A GB1217879 A GB 1217879A
- Authority
- GB
- United Kingdom
- Prior art keywords
- float
- mark
- space ratio
- pulsing
- motor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/24—Electrical devices or systems
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
1,217,879. Control of D.C. motors. SEVCON ENG. Ltd. 26 Sept., 1969 [27 Sept., 1968], No. 46046/68. Heading H2J. A float is disposed in a reservoir tank of a battery-powered industrial truck, the tank providing a source of hydraulic fluid for a mastextending ram. Fluid is supplied to the ram by a pump driven by a D.C. motor which is energized from the battery in dependance of the mark-space ratio of a pulsing controller. Movement of the float varies the mark-space ratio to limit the motor speed thereby achieving an optimum tilt speed for the height of the load. The float movement is also employed to vary the mark-space ratio of a pulsing controller for the traction motor. When the mast is being extended, the float falls to increase the resistance of associated potentiometers and to reduce the frequency of firing pulses for thyristors forming part of the pulsing controllers. The motors may be of the series or shunt types and adapted for field or armature control. A modification employs variable pulse-width controllers having main and commutating thrysistors.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4604668A GB1217879A (en) | 1968-09-27 | 1968-09-27 | Improvements in or relating to battery powered masted industrial trucks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4604668A GB1217879A (en) | 1968-09-27 | 1968-09-27 | Improvements in or relating to battery powered masted industrial trucks |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1217879A true GB1217879A (en) | 1970-12-31 |
Family
ID=10439632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4604668A Expired GB1217879A (en) | 1968-09-27 | 1968-09-27 | Improvements in or relating to battery powered masted industrial trucks |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1217879A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4102132A (en) * | 1977-03-22 | 1978-07-25 | Towmotor Corporation | Motor control |
DE3025975A1 (en) * | 1979-07-16 | 1981-02-12 | Crown Controls Corp | LIFTING VEHICLE WITH A SPEED CONTROL |
EP1669320B2 (en) † | 2004-12-10 | 2012-09-05 | Still Sas | Floor conveyor comprising a liftable device for picking up loads |
-
1968
- 1968-09-27 GB GB4604668A patent/GB1217879A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4102132A (en) * | 1977-03-22 | 1978-07-25 | Towmotor Corporation | Motor control |
DE3025975A1 (en) * | 1979-07-16 | 1981-02-12 | Crown Controls Corp | LIFTING VEHICLE WITH A SPEED CONTROL |
EP1669320B2 (en) † | 2004-12-10 | 2012-09-05 | Still Sas | Floor conveyor comprising a liftable device for picking up loads |
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