IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0887997
(1986-07-18)
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우선권정보 |
DE-3333292 (1983-09-15) |
발명자
/ 주소 |
- Finkbeiner Walter (Kasernenstrasse 6 7290 Freudenstadt DEX)
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
0 |
초록
▼
The apparatus positively induces synchronism in at least two lifting jacks. It has an upwardly and downwardly movable carriage, on the lifting jack, a column, a lifting device extending along the column, a first control device to control the lifting device in the “lift”direction, a second control de
The apparatus positively induces synchronism in at least two lifting jacks. It has an upwardly and downwardly movable carriage, on the lifting jack, a column, a lifting device extending along the column, a first control device to control the lifting device in the “lift”direction, a second control device to control the lifting device in the “lower”direction, a “lift”switch on the main lifting jack, a “lower”switch on the main lifting jack. For each lifting jack, a motor device acts on the lifting device. Along each column there is an equally spaced marking unit, the spacing corresponding to the maximum admissible lift difference between the lifting jacks. Each marking unit has an ‘ON’zone and an ‘OFF’zone. Rigidly fixed to each carriage is a tracer for scanning the marker units. Each tracer, is in an electrical switching device, and inhibits the motor device when the tracer is in the ‘OFF’zone, until such time as the tracer of the carriage which is lagging most behind is also in the ‘OFF’zone. After that, the switching device switches all motor devices on again.
대표청구항
▼
Apparatus for positively inducing synchronism in at least two movable lifting jacks, each lifting jack having an upwardly and downwardly movable carriage for supporting and lifting at least a portion of a vehicle, a column supporting the movable carriage, a lifting device extending along the column,
Apparatus for positively inducing synchronism in at least two movable lifting jacks, each lifting jack having an upwardly and downwardly movable carriage for supporting and lifting at least a portion of a vehicle, a column supporting the movable carriage, a lifting device extending along the column, a first control device to control the lifting device in a lift direction, a second control device to control the lifting device in a lower direction, and a motor device associated with the movable carriage and acting on the lifting device, at least one of the lifting jacks having a lift switch and a lower switch, comprising the improvement wherein: (a) each lifting device has an electrical switching device for operating the motor device, (b) a control line is looped serially through all of the lifting jacks and serially connects the electrical switching devices in a closed-loop, recurrent network, (c) along each column there is an equally-spaced marking unit, the spacing corresponding to the maximum admissible lift difference between the lifting jacks, (d) each marking unit is rigidly connected to each column and extends along the full length that the carriage is movable on each column, (e) each marking unit has an “ON”zone and an “OFF”zone, (f) rigidly fixed to each carriage is a tracer for scanning the marker units, (g) each tracer is in the electrical switching device, and inhibits the motor device when the tracer is in the “OFF”zone, until such time as the tracer of the carriage which is lagging most behind is also in the “OFF”zone, (h) after which the switching devices switch all motor devices on again.
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