EP0124141B1 - Electrically operated lifting jack - Google Patents

Electrically operated lifting jack Download PDF

Info

Publication number
EP0124141B1
EP0124141B1 EP19840200200 EP84200200A EP0124141B1 EP 0124141 B1 EP0124141 B1 EP 0124141B1 EP 19840200200 EP19840200200 EP 19840200200 EP 84200200 A EP84200200 A EP 84200200A EP 0124141 B1 EP0124141 B1 EP 0124141B1
Authority
EP
European Patent Office
Prior art keywords
jack
shaft
vehicle
lifted
bar
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
Application number
EP19840200200
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0124141A1 (en
Inventor
Giacomo Manassero
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.)
Siv SpA Te Volvera Italie
Original Assignee
EMGI ENGINEERING Srl
Emgi Engineering Srl
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.)
Filing date
Publication date
Priority claimed from IT5297083U external-priority patent/IT8352970V0/it
Priority claimed from IT5373183U external-priority patent/IT8353731V0/it
Application filed by EMGI ENGINEERING Srl, Emgi Engineering Srl filed Critical EMGI ENGINEERING Srl
Priority to AT84200200T priority Critical patent/ATE33614T1/de
Publication of EP0124141A1 publication Critical patent/EP0124141A1/en
Application granted granted Critical
Publication of EP0124141B1 publication Critical patent/EP0124141B1/en
Expired legal-status Critical Current

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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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/44—Devices, e.g. jacks, adapted for uninterrupted lifting of loads with self-contained electric driving motors

Definitions

  • This invention relates to a lifting jack, and more specifically to its special construction and operation employing electric drive, but with the facility for alternative manual operation should the elec- . tricity supply fail.
  • GB-A-7038 discloses a lifting jack comprising a member for coupling to a vehicle to be lifted, said coupling member being lifted by a threaded bar which is operationally connected by way of a reduction unit to an electric motor;
  • the reduction unit comprises a first and a second shaft, the first shaft being connected to the motor and the second being drivingly connected at one end to the threaded bar and being adapted at the other end to receive a crank for manually operating the jack;
  • said first shaft incorporates an eccentric section, rotation of which is arranged to cause a displacement of said first shaft away from the second shaft in order to release the engagement between the at least one gear of each shaft and to define two alternative mutual positions of the shafts, one being a position of withdrawal in which the respective gear is disengaged for the purpose of manual operation of the jack.
  • this lifting jack has been proposed for raising locomotives and other heavy objects, therefore, the reduction unit is not disposed in an arrangement of minimum bulk since this is not necessary when using the lifting jack for raising very big and heavy objects.
  • the lifting jack of GB-A-7038 in fact, cannot be placed in a luggage car having too big size.
  • DE-A-3109985 discloses a lifting jack of the type comprising a member for coupling to the vehicle to be lifted from a base on which the jack also rests, said coupling member being lifted by rotating a threaded bar, wherein the threaded bar is rotated by a low voltage electric motor operationally connected to the bar by way of a reduction unit constituted by two gears in cascade fixed on to parallel shafts, of which one is connected to the motor and the other to the bar.
  • This lifting jack does not provide the purpose of manual operation and the reduction unit and the motor are assembled in a housing of too big size as the motor is parallel to the threaded bar.
  • the main object of the invention is to propose a lifting jack in which the various components are disposed one above the other in an arrangement of minimum bulk when not operating to the advantage of accessibility of the respective vehicle compartment.
  • a lifting jack comprising a member for coupling to a vehicle to be lifted, said coupling member being lifted by a threaded bar which is operationally connected by way of a reduction unit to an electric motor; said reduction unit comprising a first and a second shaft, the first shaft being connected to the motor and the second being drivingly connected at one end to the threaded bar and being adapted at the other end to receive a crank for manually operating the jack; said first shaft incorporating an eccentric section rotation of which is arranged to cause a displacement of said first shaft away from the second shaft in order to release the engagement between the at least one gear of each shaft and to define two alternative mutual positions of the shafts, one being a position of approach in which the respective gear is engaged for the purpose of electrical operation of the jack, the other being a position of withdrawal in which the respective gear is disengaged for the purpose of manual operation of the jack characterised in that a first and a second set of gear
  • the reference numeral 1 indicates the threaded bar housed in known manner in the box casing 2 which is welded lowerly at 3 to the base 4 for support on the ground, and is provided laterally with a hollow support 5 in which at 6 there is hinged the shank 7 which is swivelled when in operation into the angular engagement position 7a for lifting the load but has its end housed in the plastic socket 8 ( Figure 1) when not operating.
  • a metal container 9 which is of approximately parallepipedal geometry, is covered with a coating of plastic material (not shown) for aesthetic and accident-prevention purposes, and contains a low voltage electric motor 10, for which in the case of automobile application the supply can be the automobile battery, provided by inserting the respective cable into the known cigarette lighter socket.
  • gear 15 of the motion reduction unit which is formed by two sets of gears of normal cylindrical toothing 15,16,17,18 and 19, 20, 21, plus a fourth gear, not shown, which engages in the gear 15 while the gears 16 and 19, 17 and 20, and 18 and 21 engage with each other.
  • the gears 15, 16,17,18 are carried by the shaft 13, while the gears 19, 20, 21 (plus that not shown because hidden by the gear 19) are fixed on to the shaft 14.
  • the shafts 13 and 14 are parallel.
  • All said gears are contained in cascade in the housing 22, which is constructed of cast light alloy and is suitably closed by the cover 24, by means of the screws 23 which are screwed into the bored bosses 9a of the container 9 ( Figure 3), thus also retaining the housing itself.
  • the shaft 14 emerges from the lower support boss 27 of the cover 24, and the shaft 13 emerges through hole 100 from the upper boss 28.
  • this latter shaft is provided with an offset central diametrical sector 29 arranged to perform a specific function described hereinafter, and its end 30 is provided with a facet 31 and a bore 32, for housing and locking the inner end 32a of the lever 33 by means of the bolt 34 and spacer 34a.
  • Said lever 33 constructed of special harmonic steel, is configured with a slightly offset profile comprising a joining step 35, in order to allow it to operate with a high level of elasticity, whereas the opposite end 36, i.e. the end outwards from the aforesaid end, is fixed by a screw 37 and spacer 38 to the boss 39 which forms one of the corresponding set of bosses which are positioned angularly spaced-apart and comprise stiffening ribs 23a, their purpose being to fix the cover 24 to the corresponding housing 22.
  • the jack operates as follows.
  • the electric motor 10 On pressing the rocker switch 11, the electric motor 10 is started and by way of its pinion 12 rotates the set of reduction gears contained in the housing 22, and of which the terminal bevel gear 26 drives the threaded bar 1 at low uniform speed, to cause raising and subsequent lowering of the support and load lifting shank 7, by two separate and opposite positionings of said switch 11.
  • said switch 11 is of open centre configuration, which operates only while manual pressure is applied, i.e. on removal of pressure the electrical supply, i.e. its operation, is interrupted, so that when the operator withdraws, the travel movement of the jack immediately stops, with the obvious advantage of general accident prevention.
  • a further useful aspect is that if for any reason the electrical supply to the motor 10 should fail, the jack is able to be set for conventional manual operation.
  • the emergency angle crank 42 comprising a knurled operating knob 43 is fitted on to the flattened end 41 of the shaft 14, to thus enable the operator to proceed with the conventional method, even if only momentarily, thus allowing the necessary tyre changing operation to be completed.
  • the jack according to the invention is essentially composed of a metal flanged support 51, comprising two spaced-apart lateral lugs 52 welded to it at 52a, and between which is positioned the mobile support 53, provided with end projections 54 of continuous profile.
  • the central sector 55 of the support 53 houses one end of the threaded bar 56 by way of the thrust bearing 57, which bar, after passing through the housing 22 containing the reduction gear 15-21 described heretofore with reference to Figure 3, emerges by way of its flattened end 30 for connecting the crank 42 comprising the knurled knob 43, for the purpose of any necessary emergency manual operation of the jack.
  • the shaft 14 comprises at its exit from the reduction unit 22 a bevel gear 25.
  • the box section of U cross-section 59 which is provided with an angular base 60 for resting on the ground 61.
  • the box section 59 is provided in the upper part of its two side flanges 62 with an end slot 63, which opens into the circular housing hole 64.
  • the respective opposing two projections 54 of the mobile support 53 have reduced-diameter profiles with a semi-circular cross-section 65 which extends beyond the axis 66 passing through the centre of the circle, in order to allow non-removable disengagement of the box section 59 during its operation described hereinafter.
  • the lever 69 is hinged, In a manner which allows it to swivel, to the inside of the flanges 62 of the box section 59, for example by means of the bolt 67 with locking nut 68, and is configured as two parallel spaced-apart flat sections between which there is positioned, by means of the bolt and nut 70, the ball joint 71 which comprises an internal thread engaging with the end 72 of said bar 56.
  • the lever 69 is joined upperly by a weld 73 to the bracket 74, which is provided on one side with a circular recess 75, and further provided with a pin 76 welded at 77 and retaining by way of the bore 79 the plate 78 which makes lifting contact with the vehicle floor after being centered in the slot of the floor by means of the shank 80.
  • the plate 78 for reasons of stability during lifting can also comprise a central appendix for housing in the cavity 75, and be provided with a circular section piece arranged to rest on the outside of the pin 76.
  • the lever 69 instead of being as shown can be hinged in a lower position by means of the further hole or other holes 81 provided in the respective flanges 62 of the box section 59.
  • the jack device of Figures 2, 4,5 and 6 operates as follows.
  • the operator starts the electric motor 10 by means of the known switch, to cause rotation of the threaded bar 56.
  • the components according to the invention which are covered by an aesthetic accident-prevention coating, become disposed one above the other in an arrangement of minimum bulk when not operating, as shown in Figure 5, to the advantage of accessibility of the respective vehicle compartment. Only two types of lifting jack have been described and illustrated, however the electrical device according to the invention can be applied with the same advantages to any other type of currently commercially available jack.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
EP19840200200 1983-02-24 1984-02-15 Electrically operated lifting jack Expired EP0124141B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84200200T ATE33614T1 (de) 1983-02-24 1984-02-15 Elektrisch angetriebener wagenheber.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT5297083U IT8352970V0 (it) 1983-02-24 1983-02-24 Martinetto di sollevamento elettro comandato
IT5297083U 1983-02-24
IT5373183U IT8353731V0 (it) 1983-09-21 1983-09-21 Martinetto automobilistico
IT5373183U 1983-09-21

Publications (2)

Publication Number Publication Date
EP0124141A1 EP0124141A1 (en) 1984-11-07
EP0124141B1 true EP0124141B1 (en) 1988-04-20

Family

ID=26329512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840200200 Expired EP0124141B1 (en) 1983-02-24 1984-02-15 Electrically operated lifting jack

Country Status (7)

Country Link
EP (1) EP0124141B1 (es)
AU (1) AU2477384A (es)
BR (1) BR8400843A (es)
DE (1) DE3470514D1 (es)
DK (1) DK91684A (es)
ES (1) ES529996A0 (es)
MX (1) MX155891A (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8526270D0 (en) * 1985-10-24 1985-11-27 Yang T H Jack
GB2210303B (en) * 1987-12-16 1992-01-29 Chung Yang Company Ltd A multi-purpose motor-operated tool for a vehicle
KR920005683Y1 (ko) * 1990-06-28 1992-08-20 주식회사 비앤앨 자동차용 전동잭
WO2000051859A1 (en) * 1999-03-04 2000-09-08 Darryl Wayne Baird Powered trailer jacking system
US6230340B1 (en) * 1999-11-20 2001-05-15 Bruce Edwards Truck bed cot system
CN102951132B (zh) * 2012-11-09 2015-04-22 广东富华工程机械制造有限公司 半挂车支腿电动齿轮箱

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190907038A (en) * 1909-03-24 1909-11-25 Thomas Foster Improvements in Screw Jacks.
US1514120A (en) * 1924-05-08 1924-11-04 William R G Alters Electric jack
US3062504A (en) * 1960-09-30 1962-11-06 Hilary P Blanchard Electric automobile jack
NL140765B (nl) * 1967-03-25 1974-01-15 Stamicarbon Werkwijze voor het afzeven en drogen van door natte granulatie van thermoplastische kunststoffen verkregen granulaat.
US3606252A (en) * 1969-07-15 1971-09-20 Joe Dorough Jr Portable electric automobile jack
DE2427443C3 (de) * 1974-06-07 1986-03-27 August Bilstein GmbH & Co KG, 5828 Ennepetal Wagenheber
DE3104119A1 (de) * 1981-02-06 1982-09-02 Ali Farzad 6000 Frankfurt Farzaneh Elektrische wagenheber
DE3109985A1 (de) * 1981-03-14 1982-11-25 Ecker, Engelbert, 7032 Sindelfingen Vorrichtung zum heben und senken eines fahrzeuges

Also Published As

Publication number Publication date
DK91684D0 (da) 1984-02-23
DK91684A (da) 1984-08-25
MX155891A (es) 1988-05-18
DE3470514D1 (en) 1988-05-26
EP0124141A1 (en) 1984-11-07
ES8502404A1 (es) 1985-01-16
AU2477384A (en) 1984-08-30
BR8400843A (pt) 1984-10-02
ES529996A0 (es) 1985-01-16

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