FR2528410A1 - CRIC IN Y FOR MOTOR VEHICLE - Google Patents

Abstract

THIS JACK INCLUDES, IN ADDITION TO THE USUAL UPRIGHT 1 AND ARM 2, A STAND 11 OPPOSED TO THE ARM, PIVOTING ON THE UPRIGHT AROUND AN AXIS 12 PARALLEL TO THE ARTICULATION AXIS 3 OF THE ARM AND EXTENDED TOWARDS THE ARM BY A LEVER 13 MAINTAINED IN SUPPORT ON AN INSIDE FACE 15 OF THE ARM BY A SPRING 14, THE FREE END 20 OF THE STAND DETERMINING WITH THE FOOT 7 OF THE JACK, WHEN THEY ARE SIMULTANEOUSLY IN CONTACT WITH THE GROUND, A SURFACE OF SUPPORT SUCH AS HEAD 9 AND FOOT 7 OF THE JACK ARE ALWAYS LOCATED IN THE NEIGHBORHOOD OF THE SAME VERTICAL V.

Description

The invention relates to jacks for lifting a crate of

  motor vehicle, type said Y, that is to say comprising an amount on which is articulated an arm whose angular position relative to the amount is adjustable, in particular by means of a screw

  maneuver carried by two parts articulating respectively

  on the arm and at the top of the upright.

  The jacks of this type rest on the ground by a foot formed at the base of the upright, and generally receive IO a lower prominence of the vehicle body in a housing, said head of the jack, formed at the free end

of the arm.

  Jacks of this type are simple and low cost, but as their amount is even more inclined relative to the vertical that the body they support is lower, their implementation involves precautions for s ensure that the head and foot of the jack are in the vicinity of the same vertical to provide adequate stability to the

vehicle raised by the jack.

  To make it easier to obtain the cor-

  recte the jack, it has been proposed to equip the foot of the jack a wide inclined sole relative to the amount so that when setting up the jack, placing the sole flat on the ground, the head of the jack jack is on a vertical passing through the sole when the jack is partially deployed However, this correct position of the head can not be satisfied in all cases since, the ground clearance of the vehicle to the right of the jack may vary in a large extent depending

  including the load of the vehicle, the condition of inflate-

  tire and the conformation of the ground, the deployment of the jack during its installation is very variable. It is also known to develop in the

  mounting a sliding rod whose upper end

  the upper arm cooperates with the arm and the lower end

  the ground, directly or through an oscillating sole, constituting in a way a movable heel for the foot of the jack, increasing its surface of sus-temptation and making it inclinable relative to the amount according to the angular position of the arm, so the height of the head jack Io, so that it is always found

  on a vertical line passing through said surface of sus-

  temptation, or nearby, even for a significant deployment of the jack However, the sliding rod

  works in compression, and it follows from

  I 5 ments and the risk of deformation which could impair the operation of the jack In addition, this provision

  is relatively expensive and difficult to achieve.

  The invention aims to achieve a low cost jack and whose implementation

  easily and automatically in the posi-

the most stable

  For this purpose, the subject of the invention is a jack of the aforementioned type, characterized in that it comprises, on the side of the post opposite to the arm, a stand which pivots on the upright around an axis of articulation parallel to that of the arm and located below the latter, and which is extended to the arm by a lever held in support on a lower face of the arm by a spring, the free end of the stand determines with the foot of the jack when they are simultaneously in contact with the ground, a surface of levitation such that the head and the foot of the jack are always in the vicinity of a

even vertical.

  According to some advantageous features of the invention: the stand, its axis of articulation and the lever are made with the same wire, the

  crutch being formed of two substantially parallel strands

  connected to each other by a transverse strand constituting its free end of support on the ground; Io the support of the lever on the arm is by

  its free end when the jack is in the position of use

  sation, and by a bulge located between this end and the axis of articulation of the stand when the arm is folded against the upright for the storage of the jack, I 5 this drawdown causing that of the stand against a lower face of the upright ; the spring is in the form of a hairpin and has turns on each side surrounding the axis

articulation of the crutch.

  An embodiment of a jack according to the invention

  The invention is given below with reference to the accompanying drawings, in which: FIG. 1 is an elevational view of the jack in two positions of use; Fig 2 is a view of the jack in storage position in side elevation and in section along the line II-II of Fig 3; and Fig 3 is a sectional top view

  partial line II-III of Fig 2.

  FIG. 1 shows, in solid lines, a Y-type jack comprising an upright 1 on which an arm 2 is arcuate at one end, about a horizontal articulation axis 3, and a maneuvering screw 4. carried by two nuts 5, 6 hinged respectively towards the middle of the arm 2 and the upper part of the upright 1 The nut 5 is threaded, while the other nut 6 constitutes an axial abutment for the screw, so that the

  rotation thereof causes a variation in the posi-

  The base of the upright 1 forms a foot 7 resting on the ground 8 and defined by a transverse bent convex plate, and the free end of the arm 2 comprises a housing 9, constituting the head. the jack, which cooperates with

  a prominence 10 of a vehicle undercarriage

  lift and is defined by a concave angled cross plate. The arm 2 and the upright i are made of U-shaped sheet metal folded open upwards, in a known manner: they each comprise two parallel walls,

  those 2A of the arm engaging just between those l A of the world

  both, and they are sufficiently rigid so that the Y they constitute does not deform under the load of the vehicle The variation of the angular position of the arm relative to the amount, obtained by the rotation of the screw

  4, adjusts the height of the head 9 of the jack

  Fig 1 thus shows the jack in two positions of use respectively corresponding to ground guards of the vehicle, the right of the prominence 10, minimum h <(in solid lines) and maximum h 2 {in

mixed lines).

  According to the invention, the jack further comprises, on the side opposite the arm 2, a crutch il which pivots by

  one end on the upright around a hinge axis

  12 parallel to the arm 3 and disposed

  below this last, between this axis 3 and the foot 7 This crutch extends beyond the axis 12 by a lever

  actuator 13 which is elastically and slidably

  under the action of a torsion spring 14 on the

  lower face or core 15 of the arm 2.

  Specifically, the stand 11 and the lever 13 are made of a single piece of wire bent several times at 90 from one end of this wire, there is: a transverse end 16 of the lever 13; the longitudinal body of the lever 13, located in the median vertical plane of the arm and the upright; a

  elbow 17 crossing outwardly a hole 18 of one of the

  side kings l A of the amount 1 and constituting a half

  the axis 12; a side strand 19 of the stand; the extré-

  IO transverse support 20 of the stand; the other strand

  lateral 21 of the stand; and a second elbow 22 passing through

  inward a second hole 23 of the other wall la-

  The lateral elevation (Fig. 1 and 2) of the Montantcoaxial LA at the hole 18, the lever stand assembly 13 I 5 is rectilinear, with the exception of the extreme half 24 of the lever, which is bent at an obtuse angle. down in

  defining a bulge at the top of the elbow.

  The spring 14 which holds the action lever

  seated against the lower face 15 of the arm 2 is a hairpin spring housed between the parallel walls 1A of the upright and provided with turns surrounding the

  sections 17 and 22 of the wire constituting the

  the support of the lever 13 on the arm 2 is effected by its free angled end 16 when the jack is in the use position (Fig 1), and by its bulge 25 when the arm 2 is closer to the upright 1 'in use position, and especially when the jack is in

  its storage position shown in Fig 2.

  The position of the stand is determined by the cooperation of its actuating lever 13 with the

arm 2.

  In the storage position, the folding and retraction of the arm 2 in the upright 1 causes, by pressing the arm on the bulge 25, the folding of the stand 11 against the upper part of the face

lower 26 of the amount.

  When maneuvering the screw 4, by means of a crank 27, so as to deploy the jack by varying the angular position of the arm, the spring 14 pushes the lever 13 while maintaining its bulge 25 and its end 16 bearing against the underside 15

  of the arm, and consequently the crutch is progressively

  The dimensions I0 of the stand 11 and the lever 13 and the location of the pin 12 are provided so that the free end

  the kickstand determines with the foot 7 of the jack, when

  that this end and this foot are simultaneously in contact with the ground, a lifting surface such that the head 9 and the foot 7 of the jack are always in the vicinity of the same vertical y, as can be seen in FIG. 1, that the ground clearance of the vehicle on the right of the jack is minimum h, maximum h 2 or intermediate between

these two values.

  Thus, during its installation, the jack is deployed so that the distance between its head 9 and its foot 7 is equal to the ground clearance of the protrusion 10; the head 9 is engaged on this prominence, and, by placing the stand on the ground by its end 20, it is sure that the foot 7 is substantially vertical to the head 9, which ensures optimum stability of the vehicle as soon as possible. that it is lifted by the jack deployed by maneuvering

the screw 4.

  It should be noted that the fact that the stand is positioned by elastic support of its lever 13 against the arm 2, by means of the spring 14, has the advantage of making it eclipsable under the possible action of excessive pressure exerted on its end 20, which thus avoids

  its deformation or deterioration.

Claims (4)

CLAIMS -   Jack for a motor vehicle, of the type comprising an amount (1) on which is articulated a   arm (2) whose angular position with respect to the   is adjustable, in particular by means of an operating screw (4) carried by two parts (5, 6) articulating respectively on the arm and the upper part of the upright, characterized in that it comprises, on the side of the upright opposite the arm, a stand (11) which pivots on the upright about an axis of articulation (12) IO parallel that of the arm and located below the latter, and   which is extended towards the arm by a lever (13)   held in abutment on a lower face (15) of a arm by a spring (14), the free end (20) of the kickstand determining with the foot (7) of the jack, when they are simultaneously in contact with the floor, a surface of lift such as the head (9) and the foot (7) of the   jack are always in the vicinity of the same vertical wedge (V).   2. Jack according to claim 1, characterized   risé in that the stand (11), its axis of articulation (12) and the lever (13) are made with the same wire, the stand being formed of two strands (19, 21) substantially parallel interconnected by a transverse strand (20) constituting its free end support on the ground.   3. Jack according to one of claims 1 and   2, characterized in that the support of the lever (13) on the arm (2) is effected by its free end (16) when the jack is in the use position, and by a bulge (25) located between this end and the hinge axis (12) of the stand (11) when the arm is folded against the upright (1) for the storage of the jack, this drawdown   causing that of the crutch against a lower face re (26) of the amount.   4. Jack according to any of the claims   cations 1 to 3, characterized in that the spring (14) is in the form of a hairpin and has on each side turns surrounding the axis of articulation (12) of the stand (11).