FR2857656A1 - Hydraulic car jack comprises two notched beams supported on spindle on each lifting arm by means of spring - Google Patents

Abstract

The hydraulic jack (9), fixed on a support (12) comprising two male squares (11) for receiving a socket spanner, enables the unlocking and re-clamping of the vehicle wheel. The hydraulic jack comprises two notched beams (4) which are supported on a spindle (3) located on each lifting arm (2) by means of a spring (7). During lowering of the jack locking is cancelled by means of an operating lever which is supported on the crosspiece of the notched beams.

Description

The present invention relates to a four-wheel hydraulic jack which

  has an automatic locking in high and intermediate position whose hydraulic cylinder, mounted on an aniovible support, allows to unlock and tighten the screws of the wheels of

light motor vehicles.

  The lifting operation of motor vehicles is traditionally performed by the individual using the jack of the vehicle or a jack with four wheels that can be equipped on its frame with holes to manually put a pin to lock it in the up position with the risk of forgetting the spit, or using candles to secure the lifting operation.

  The hydraulic jack according to the invention comprises two articulated notched spars which bear on an axis located on each lifting arm with the help of a spring. The jack is automatically locked in the work position high or intermediate which allows to work safely. During the descent of the jack, the blocking is canceled with the help of the lever that rests on the rear of the side members, releasing them 15 of their supports, while releasing the pressure of the cylinder. The operating lever releases the notches of the pins (3) while releasing the pressure of the jack. The lifting arms (2) can thus fold.

  The operation of releasing the wheel bolts is traditionally carried out by the individual using several types of key (cross key, telescopic wrenches, etc.), see an electric key plugging into the cigarette lighter. The hydraulic device according to the invention allows the unblocking of the screws without effort and in complete safety. It comprises a hydraulic cylinder mounted on an articulated support, the jack pushing a lever at the base of which is a male square on each side to put a socket wrench corresponding to the screws. The cylinder has a power of 2 tons amplified by the lever.

  This device also makes it possible to tighten the wheel screws directly with a socket wrench by limiting the torque or by inserting between the male square of the device and the screw of the wheel a key calibrated to the necessary torque.

  The accompanying figures illustrate the invention: FIG. 1 shows the jack in the raised position from which the release device 30 is removed and the screws of the wheels are tightened again.

  Figure 2 shows the complete jack in the raised position.

  Figure 3 shows the release device and clamping unlocking position.

  With reference to these drawings, the jack comprises (FIG. 1) a base (1) with the four wheels, two lifting arms (2) and two locking pins (3), two notched spars (4) resting on the pins (3). ), a spring (7) which holds the longitudinal members (4) in contact with the pins 5 (3), two auxiliary arms (8) for holding the yoke (6), this yoke receives a stud (5) machined in a V-shape which inserts or withdraws by simple pressure. It can be of different height according to the ground clearance of the vehicle.

  (Fig 2) the operating lever (18) presses on the rear cross member of the side members (17) to release the notches of the side members to allow the descent of the jack.

  (fig3) represents the device for unlocking or tightening the wheel bolts.

  It comprises a hydraulic cylinder (9), a lever (10), with at its base a male square (11) on each side at the bottom of the lever (10), a holding support (12), an articulated foot (13) which makes it possible to reach the screws at different heights, a handle (14) for holding or carrying the device, an axle with a wheel (15) on each side at the top of the lever (10) which serve, when the unlocking device and tightening is folded and inserted into the jack, to maneuver the lifting arms of the jack. (fig 2). The articulated foot (13) resting on the ground, returns the thrust amplified by the lever on the male squares (11) provided with a socket wrench.

  By way of example according to (FIG. 1) the repeats are made of aluminum as well as the rep (17) of (FIG. 2). They can also be made of iron.

  By way of nonlimiting example, the dimensions of the jack (FIG. 2) are, in the low position, 135 mm, in the high position of 310 mm and more depending on the height of the stud (5) (FIG. 500 mm and the width of 165 mm.

  The dimensions of the folded release and clamping device are 310 mm in length 115 mm in width and 115 mm in height. Unfolded, it can reach screws up to 400 mm high and more by putting a shim under the foot (13).

  However, by increasing the dimensions of the jack and the release device, as well as the power of the jack, it would be possible to operate on heavier vehicles.

  The jack according to the invention can be manufactured also without the automatic locking device, but with the removable cylinder, or with the automatic locking device, the cylinder is not removable.

  The unblocking and clamping device can be due to its small size permanently in the vehicle. In case of puncture for example, it is very difficult or impossible for some people to unlock the screws of the wheels. With the device according to the invention, whose use is easy, the release and tightening is effortless.

  The manufacture of the various parts making up the complete jack according to the invention requires, in its configuration described, and as an indication, milling, turning, laser cutting or in press, sawing and drilling.

  The device according to the invention is particularly intended, in particular, to lift their light motor vehicle, unlock and tighten the wheel screws.

Claims (5)

claims   1) Hydraulic jack with four wheels characterized in that it comprises an automatic locking device in the raised position and a part comprising the hydraulic cylinder which is removable for unlocking and tightening the wheel bolts of light motor vehicles.   2) Jack according to claim 1 characterized in that two notched spars (4) bear on an axis (3) fixed on each lifting arm (2) assisted by a spring (7) and thus block the jack in the upper position or intermediate.   3) Jack according to claims 1 and 2 characterized in that the operating lever (18) held against the cross member (17) back of the longitudinal members (4) allows to release the notches of the 10 axes (3) while releasing the pressure of the cylinder, the lifting arms (2) can thus be folded.   4) Jack according to claim 1 characterized in that a portion comprising the hydraulic cylinder is removable. It is composed of a support (12) of an articulated foot (13) of a lever (10) having at its lower base an axis with a male square (11) at each end 15 to receive a socket wrench, at its upper base an axle with a wheel (15) at each end which allow, when the device is inserted in the jack, to operate the lifting arms (2).   5) Jack according to claims 1 and 4 characterized in that the articulated foot (13) bearing on the ground, returns the thrust, amplified by the lever (10), on the male squares (11) 20 provided with a key to socket.