GB1197167A – Lift Trucks
– Google Patents
GB1197167A – Lift Trucks
– Google Patents
Lift Trucks
Info
Publication number
GB1197167A
GB1197167A
GB530969A
GB530969A
GB1197167A
GB 1197167 A
GB1197167 A
GB 1197167A
GB 530969 A
GB530969 A
GB 530969A
GB 530969 A
GB530969 A
GB 530969A
GB 1197167 A
GB1197167 A
GB 1197167A
Authority
GB
United Kingdom
Prior art keywords
lift
ram
variable resistor
circuit
speed
Prior art date
1968-03-26
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
Application number
GB530969A
Inventor
Henry J Thomas
George Joseph Trusock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CKARK EQUIPMENT Co
Original Assignee
CKARK EQUIPMENT Co
Priority date (The priority date 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 date listed.)
1968-03-26
Filing date
1969-01-31
Publication date
1970-07-01
1969-01-31
Application filed by CKARK EQUIPMENT Co
filed
Critical
CKARK EQUIPMENT Co
1970-07-01
Publication of GB1197167A
publication
Critical
patent/GB1197167A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T137/00—Fluid handling
Y10T137/7287—Liquid level responsive or maintaining systems
Y10T137/7313—Control of outflow from tank
Y10T137/7323—By float
Y10T137/7326—Low level safety cut-off
Abstract
1,197,167. Masted lift trucks. CLARK EQUIPMENT CO. 31 Jan., 1969 [26 March, 1968], No. 5309/69. Heading B8H. [Also in Division B7] The electric control circuit for the drive motor 19 of a masked lift truck includes a variable resistor 48 which is coupled to the hydraulic lift ram circuit whereby the speed of the motor 19 is reduced as the mast is extended. The electric circuit also includes a switch 50, which opens when the mast assembly is extended to a predetermined height, a pulse control unit 44 and a variable resistor 40 which is manually controlled by the operator on a platform which rises with the lifting carriage. The variable resistor 48 is coupled to a float Figs. 4, 5 (not shown), in the fluid reservoir of the lift ram whereby, as the level of fluid falls on extension of the lift ram, the resistance is increased. The hydraulic circuit, Fig. 3 (not shown), includes two pumps in parallel, to provide two-speed extension of the lift ram, and the return line to the reservoir includes a flowrestrictor and a by-pass therefor to provide two-speed retraction of the ram under the action of gravity.
GB530969A
1968-03-26
1969-01-31
Lift Trucks
Expired
GB1197167A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US71624068A
1968-03-26
1968-03-26
Publications (1)
Publication Number
Publication Date
GB1197167A
true
GB1197167A
(en)
1970-07-01
Family
ID=24877287
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB530969A
Expired
GB1197167A
(en)
1968-03-26
1969-01-31
Lift Trucks
Country Status (5)
Country
Link
US
(1)
US3524522A
(en)
BE
(1)
BE727614A
(en)
DE
(1)
DE1912924A1
(en)
FR
(1)
FR2004705A1
(en)
GB
(1)
GB1197167A
(en)
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3756350A
(en)
*
1971-03-01
1973-09-04
Hyster Co
Materials handling truck
US4265337A
(en)
*
1979-07-16
1981-05-05
Crown Controls Corporation
Fork lift truck speed control dependent upon fork elevation
US4598797A
(en)
*
1984-04-13
1986-07-08
Clark Equipment Company
Travel/lift inhibit control
US5890562A
(en)
*
1996-08-16
1999-04-06
Bt Prime Mover, Inc.
Control console for material handling vehicle
DE112006002080T5
(en)
*
2005-08-04
2008-07-17
OSKO FORKLIFTS PTY LTD, Dudley Park
Freely movable material transport trolley or cart in modular design
US8230976B2
(en)
*
2008-04-16
2012-07-31
The Raymond Corporation
Pallet truck with calculated fork carriage height
Family Cites Families (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US1267742A
(en)
*
1915-08-18
1918-05-28
Mercury Mfg Co
Regulator for draft-vehicles.
US1707657A
(en)
*
1925-12-07
1929-04-02
Standard Oil Co
Liquid-meter device for tank trucks
US2691385A
(en)
*
1949-06-09
1954-10-12
Carrie Asbeck
Safety valve for hydraulic brakes
US2790513A
(en)
*
1956-07-10
1957-04-30
Elwell Parker Electric Co
Control circuit for industrial lift trucks
US2935161A
(en)
*
1957-11-07
1960-05-03
Allis Chalmers Mfg Co
Safety system for load elevating vehicles
1968
1968-03-26
US
US3524522D
patent/US3524522A/en
not_active
Expired – Lifetime
1969
1969-01-29
BE
BE727614D
patent/BE727614A/xx
unknown
1969-01-29
FR
FR6901783A
patent/FR2004705A1/fr
not_active
Withdrawn
1969-01-31
GB
GB530969A
patent/GB1197167A/en
not_active
Expired
1969-03-14
DE
DE19691912924
patent/DE1912924A1/en
active
Pending
Also Published As
Publication number
Publication date
DE1912924A1
(en)
1969-10-16
FR2004705A1
(en)
1969-11-28
BE727614A
(en)
1969-07-01
US3524522A
(en)
1970-08-18
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Legal Events
Date
Code
Title
Description
1970-11-11
PS
Patent sealed [section 19, patents act 1949]
1981-09-16
PCNP
Patent ceased through non-payment of renewal fee