EP1924521A1 - Handle for controlling a lifting device - Google Patents
Handle for controlling a lifting deviceInfo
- Publication number
- EP1924521A1 EP1924521A1 EP06784236A EP06784236A EP1924521A1 EP 1924521 A1 EP1924521 A1 EP 1924521A1 EP 06784236 A EP06784236 A EP 06784236A EP 06784236 A EP06784236 A EP 06784236A EP 1924521 A1 EP1924521 A1 EP 1924521A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- handle
- cavity
- control handle
- control
- pressure
- 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.)
- Granted
Links
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 230000033001 locomotion Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/52—Details of compartments for driving engines or motors or of operator's stands or cabins
- B66C13/54—Operator's stands or cabins
- B66C13/56—Arrangements of handles or pedals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/18—Power-operated hoists
Definitions
- the present invention relates to a new type of control handle for controlling different types of lifting devices.
- US 3,998,432 shows an entirely pneumatic concept, where upward and downward motions are generated by a valve, which is integrated in the handle portion.
- the outer jacket constituting the handle will act on a slide, which determines if the integrated lifting cylinder shall be aired or de-aired.
- the concept has drawbacks, as for instance the optimization of the control characteristics only may be performed through mechanical modifications and as both said slide and lifting cylinder always have an undesired friction in the included sealings - which negatively affects the total performance of the lifting device.
- the object of the invention is to provide a cost-efficient solution as to control handle for lifting devices, which withstand tough industrial environments with a minimum of maintenance and calibration. Said object is achieved by using a comparatively new type of pressure sensors which with great accuracy manages to measure pressures deviating from the atmospheric pressure in the order of +/-10 kPa. Through industrial and medical use, this type of sensors has a relationship between price and performance, which makes them very useful in said context.
- the sensor is connected to a cavity in the control handle, which partly consists of a resilient membrane, which in its turn is connected to the handle portion of the control handle in such a manner that when a vertical force is applied to the control handle a pressure deviation in the cavity being in proportion to the force.
- the pressure deviation measured by the sensor is read by a control unit, which in its turn controls the driving device performing the lifting operation itself.
- a number of advantages is then obtained as compared to other known techniques. 1. Very little dead zone. The lowest measurable force is very small, as the design as such allows a very low friction in the movable portion.
- control handle and the control unit with associated contact means in both ends (which is the predominating solution) is a very common reason for shutdowns with said types of lifting devices.
- a helical hose is thus as such an advantage, as it is more insensitive, robust and cheaper.
- the gripping device and the control handle rotate freely in relation to the driving unit, for instance when the operation sequence implies that the operator is moving around in the same direction, turn after turn.
- the situation described above with a multipolar cabling between the control unit and the control handle may thus only be used if a multipolar swivel means (or current collector) is mounted on the cabling somewhere between the control handle and the driving unit.
- Said solution is both expensive and a clear drawback as to reliability.
- the device of the invention only needs a pneumatic swivel to obtain a freely rotating control handle, which is less expensive as well as more reliable.
- Fig. 1 shows the parts of a conventional lifting device
- Fig. 2 show a cross section of a circular design of the control handle according to the invention
- Fig. 3 shows how the control handle is affected by the upward force applied by the operator
- Fig. 4 shows how the control handle is affected by the downward force applied by the operator
- a driving unit (A) is arranged to lift the control handle (C) and the gripping device (D) by means of a wire (B).
- the driving unit (A) may for instance be an electric motor with a wire drum or a pneumatic cylinder with the purpose to supply the lifting force.
- the driving unit (A) is controlled by a control unit (H), which via the connection (E) and the pressure sensor (F) is provided with information about operator forces influencing the control handle (C).
- Fig. 2 shows a cross section of a circular control handle according to the invention.
- the wire (B) emanating from the driving unit is with a shackle (N) connected to the through shaft (K) and further to the gripping device (D).
- N a shackle
- D the gripping device
- the lifting force passes straight through the control handle via the shaft (K).
- a movable outer jacket is provided around said shaft (K), which jacket forms the handle (L) suspending in its lower portion in a slide bearing (Z) and in its upper portion in a resilient membrane (R) by means of screws (V”) and a washer (Q).
- the membrane (R) is formed as a plate with a centre hole where the outer and inner edges of the plate are fixed to the cover (O) by washers (T), (U) and screws (V), (V”), which forms a cavity (P) between the membrane (R) and the cover (O).
- the cavity (P) will change its volume when the handle portion (L) and hence the membrane (R) is pressed up or down. Said change of volume results in a change of pressure in the cavity, which pressure is measured in the pressure sensor (F) via the connection conduit (S) and the connection hose (E).
- a very small opening (O) the purpose of which is very slowly to leak atmospheric pressure into the cavity.
- said opening to the inclusion (P, S, E) also may be arranged in another way and further anywhere in connection with the pressure sensor or the hose (E).
- the effects of for instance material stresses in the membrane and the dead weight of the handle portion (L) will be "tared” away automatically.
- the limitation valid for the opening (O) is that it must not leak so rapidly that it injuriously affects normal raising or lowering motions. If the handle portion (L) would be subject to upward or downward forces exceeding the measurement region the end position limitations (X) and (Y) will stop the motion before any permanent damage is established on the membrane or the pressure sensor.
- Fig. 3 shows the handle portion (L) in its uppermost position at the end position limitation (X).
- the cavity (P') has then its very smallest volume and the pressure detected by the pressure sensor is the very highest.
- Fig. 4 shows the handle portion (L) in its lowest position at the end position limitation (Y).
- the cavity (P") has then its very largest volume and the pressure detected by the pressure sensor is the very lowest.
- the gripping device (D), here illustrated as a simple hook may in many cases be a more complicated mechanism with sensors and activators of different kinds. Therefore, it is an obvious advantage if the membrane (R) and the cavity (P) are designed so that a through hole in the centre of the control handle may be used for leading cabling and/or hoses for pneumatic therethrough.
- the advantage is that the handle may be gripped from any side without being disturbed by said cabling and/or hoses, which otherwise must be brought over the outside of the handle.
- the pressure sensor (F) may also be mounted directly at the cavity (P), and the connection to the control unit (H) may be performed by cabling instead of a hose.
- the cavity is arranged on one side of the shaft (L) and hence offers the possibility that the membrane is designed without any centre hole, fall within the scope of the device according to the invention.
- the cross section of the control handle is circular, as is indicated in the examples above.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Control Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06784236T PL1924521T3 (en) | 2005-09-13 | 2006-09-12 | Handle for controlling a lifting device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0502012A SE528223C2 (en) | 2005-09-13 | 2005-09-13 | Control handle for power operated hoist, contains cavity with sensor for measuring pressure deviation when vertical force is applied to handle |
PCT/SE2006/050323 WO2007032735A1 (en) | 2005-09-13 | 2006-09-12 | Handle for controlling a lifting device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1924521A1 true EP1924521A1 (en) | 2008-05-28 |
EP1924521B1 EP1924521B1 (en) | 2013-02-13 |
Family
ID=37054379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06784236A Active EP1924521B1 (en) | 2005-09-13 | 2006-09-12 | Handle for controlling a lifting device |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1924521B1 (en) |
DK (1) | DK1924521T3 (en) |
ES (1) | ES2408312T3 (en) |
PL (1) | PL1924521T3 (en) |
SE (1) | SE528223C2 (en) |
WO (1) | WO2007032735A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105984820B (en) * | 2015-01-30 | 2019-02-15 | 李建成 | Intelligent balance device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE364692B (en) * | 1972-10-23 | 1974-03-04 | J Faegerskioeld | |
US3921959A (en) * | 1974-07-22 | 1975-11-25 | Columbus Mckinnon Corp | Load balancer and hoist control |
US5772184A (en) * | 1996-01-25 | 1998-06-30 | Knight Industries, Inc. | Load support mounted control arrangement for fluid pressure operated hoist |
US5915673A (en) * | 1996-03-27 | 1999-06-29 | Kazerooni; Homayoon | Pneumatic human power amplifer module |
-
2005
- 2005-09-13 SE SE0502012A patent/SE528223C2/en unknown
-
2006
- 2006-09-12 PL PL06784236T patent/PL1924521T3/en unknown
- 2006-09-12 EP EP06784236A patent/EP1924521B1/en active Active
- 2006-09-12 WO PCT/SE2006/050323 patent/WO2007032735A1/en active Application Filing
- 2006-09-12 ES ES06784236T patent/ES2408312T3/en active Active
- 2006-09-12 DK DK06784236.9T patent/DK1924521T3/en active
Non-Patent Citations (1)
Title |
---|
See references of WO2007032735A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1924521B1 (en) | 2013-02-13 |
DK1924521T3 (en) | 2013-04-22 |
WO2007032735A1 (en) | 2007-03-22 |
SE0502012L (en) | 2006-09-26 |
ES2408312T3 (en) | 2013-06-20 |
SE528223C2 (en) | 2006-09-26 |
PL1924521T3 (en) | 2013-07-31 |
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