US2002428A - Automotive jack - Google Patents

Description

May 21, 1935. 2 B BLAC 2,002,428

' AUTOMOTIVE JACK Filed Sept. 8, 1931 DEM 11M! 51, Hex

INYENTOR ATTOR NEY Patented May 21, 1935 UNITED STATES PATENT OFFICE I p 2,002,428" 3 l AUTOMOTIVE JACK V Benjamin Black, Brooklyn, N. Y. Y Application September 8, 1931, Serial No. 561,738 I 9 .1 Claim. (01. 254-86) The object of the invention is to provide a jack for use in connection with vehicles to be carried by the latter as a permanent part of the equipment; to provide a jack ofthis character which is swingable into a position of non-use from which it may be extended to operative position and made to subsequently effect elevation of the vehicle, the elevating action following the lowering movement in the operation of the actuating means alone; to provide a jack which will positively maintain its inoperative position; to provide a device of this character which will positively maintain its extended position; and to provide a jack of the character described which is of comparatively simple form and susceptible of cheap manufacture.

With this object in view, the invention consists in a construction and combination of parts, of which a preferred embodiment is illustrated in the accompanying drawing, wherein:

Fig. 1 is an elevational view of the invention shown in extended position.

Fig. 2 is a view similar to Fig. 1, but looking in a direction at right angles to that in which the latter figure is viewed, parts being broken away in this figure.

Fig. 3 is a side elevational view, looking in a direction in which Fig. 2 is viewed, but showing the jack in inoperative position.

Fig. 4 is a perspective view showing the head portion of the jack when in the inoperative position.

The jack proper comprises an extensible leg composed of the telescoping sections l and II of which the latter is in surrounding relation to the former and is keyed to the same as indicated at l2 to preclude relative angular movement of the sections, said key l2 being slidably engaged in a groove or slot ll formed in the outer wall of the section H).

The key or feather I2 is carried in the upper or collar portion l5 of the section II and this collar provides a shoulder against which one end of the compression spring l6 bears, the compression spring being in surrounding relation to the section II and compressed between the collar portion l5 and a follower ring l1, surrounding the section II but slidably mounted thereon.

The sections are extended by the admission of a fluid to the same, both sections being hollow for the reception of the fiuid and as this is forced into the section II], it gradually forces the section I l downwardly until the foot l8 bears on the surface, when continued extension will result in raising the load is' attached. V

Preferably the fiuid employed is inelastic and a conventional hydraulic pump is employed to force it into'the section ID at the upper end of the latter through the nipple l9 which is connected to the section II) and to a feed hose 20 connected with the pump. I

The follower ring I! is provided with an upstanding arm 2| to which is connectedthe lifting arm 22, the latter comprising the sections 22a and 22b hingedly connected together as at 23, a torsional spring 24, being mounted to the hinged connection and engaged with the sections to cause the latter to fold down into parallelism with each other as indicated in Fig. 3. The arm section 2212 is pivotally connected as indicated at 25 with'the follower ring arm 2i, while the arm section 22a is pivotally connected as indicated at 26 with the hanger plate 21, the latter being designed for attachment to any convenient part of the vehicle to which it may be secured by means of fasteners, or by welding, or in any other accessible manner. In the illustrated embodiment, the hanger plate is secured to a bracket plate 28 constituting an extension of the clamp member 29, the latter straddling the channel 30 of the chassis frame to which it is secured by the clamp plate 3| and the nuts 32 engaging screw studs 33 constituting integral parts of the clamp member 29.

The lifting leg comprising the sections Ill and l I, is hingedly connected to the hanger plate, as indicated at 34, by means of a cap plate 35 to which the section III is connected at the upper end of the latter. By means of this construction, the lifting leg may swing into a position of parallelism with the hanger plate or into a position of perpendicularity with respect to the latter. In this latter position, the cap plate lies snug against the under-face of the hanger plate and this position is positively insured by means of a latch loop 36, hingedly mounted as at 31, to the free end of the cap plate. A torsional spring 38, mounted at the hinge connection 31, tends to swing the latch loop to a position at right angles with the cap plate, as indicated in Fig. 2, when the latch will pass over the tongue 39 constituting an integral extension of the hanger plate. The latch loop is released from its engaged position with the tongue by means of a finger 40 carried by the to which the section lo 7 section II of the jack leg, so that when the latter arm 42formed at its upper end with a lateral finger 43. In the retracted position of the section- II, this finger engages in a cam slot 44 formed in the under-edge of a block 45 carried by the hanger plate, preferably as an integral part thereof, the finger lying in this slot during the swinging movement of the jacking leg to inoperative position, after which it passes from the slot under the horizontal edge 41 to positively maintain the folded position of the jacking leg. I t

In the operation of the invention, with the parts inoperative position as indicated in Fig. 3, the pump is actuated so that fluid is forced into the telescoping sections comprising the jacking leg. This first results in a movement of the section I l against the pressure of the spring l6 until the finger 43 shall have passed from the lower edge 41 of the block 45 into said slot 44. The continued application of fluid by the pinup results in further extending the section ll, butthe spring l6 bearing on the follower ring l1, tends to unfold the arm sections 220. and 2212, with the result that the jacking leg is swung down to vertical position by reason of the unfolding operation of the arm 22. V The continued operation of the pump results in further extending the section II, this further extension being permitted by the compression of the spring 16, as the jacl; leg will have reached its vertical position with the cap plate engaging the under-face of the hanger plate 21. The extension of the section II moves the finger 49 out of obstructing relation with the lug 4 l, so that the spring 38 functions to shift the latch loop into a right anguiar position with respect to the cap plate, permit ing. it to yield laterally when the rounded edge 49 engages the tongue 39 and subsequently swing over said tongue. dicular position of the jack leg, elevation of the load is effected by continued actuation of the pump to further extend section II.

After use, when it is desired to return the jack into inoperative or folded position, the valve on the pump is actuated to permit the back flow of the fluid, when the spring l6 first functions to slide the section H back over the section Hi, When the finger iil engages the lug 4| thus releasing the latch loop 36' from the tongue 39. During this action the compression spring I6 is permitted to expand, thereby moving member 21 to its lowermost position relative to the section ll of the jack, thus maintaining the angular separation of arms 22b and 22a. Then the torsional spring 24 on the lifting arm may function to fold the arm sections into parallelism with each other and thereby swing the jacking leg laterally and upwardly toward the vehicle body.

What claimed as new, is:

A vehicle jack including an extensible lifting leg having a swinging connection withthe ve- "nicle and means for first partially extending the leg while the latter is in elevated position and. for then lowering the leg to a vertical position and then further extending it, said means cornprising a fluid under pressure within said leg, and a jointed arm composed of pivotally connected sections of which one is terminally connected with a section of the lifting leg and the other with a fixed part of the vehicle, and spring means compressed during the partial extension of the leg and adapted to contract the leg when the fluid pressure is released.

BENJAMIN BLACK.

In the latched perpen-

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