ES2268802T3 - CAT. - Google Patents

Abstract

A jack, either scissor-type or Y-type with a combined nut based on two units, metal (11) and synthetic (12), as well as a carrier arm with special features: the metal part of the nut It has a U-shape and has two necks (13) that fit inside the holes of the arm (25) and the synthetic part is longitudinal, and it has the threaded stem that passes through it and its movement is controlled inside the metal part The support arm of the carrier plate (25) is made from a small sheet or band, thus obtaining a more robust and less heavy jack.

Description

Cat.

Technical sector

The invention relates to a cat, and more specifically a jack for lifting vehicles, of the types  of the so-called scissors and the Y-shaped, in all which is the existence of a threaded spindle that goes through a nut, generates the movement of raising and / or lowering a portion of the cat that is in contact with the body of the vehicle.

Prior state of the art

In all these units, nuts are known made entirely of synthetic material, plastics, as well as other nuts made of plastic and metal, duly combined, both versions being used interchangeably of the mechanical stresses to which said stress is subjected nut.

From references EP.A. 0320613 and EP.A. 0340551 examples of combination nuts are known, in which provide nuts with synthetic bodies fitted with stumps lateral support, partially receiving said stump parts metallic of other auxiliary parts that combine with them to effects of increasing the resistance of said stumps, lowering the degree of friction between the stumps of synthetic material and the holes made in the cat's arms.

These known solutions are limited, since despite the contribution of metal parts to plastic stumps, the resistance of the nut is increased only To some extent.

On the other hand, some of these types of cats they are made of aluminum, whose purpose is to reduce the weight of these units for obvious reasons. However the disadvantage of these cats is that they are substantially more expensive than conventional metal.

Exhibition of the invention

An object of the invention is to provide a cat comprising a combined nut made of materials synthetic and metallic, providing greater resistance than Conventional nuts of this type.

Another object of the invention is to provide a cat with a combined nut that is very easy to keep in the inside of it.

Another object of the invention is to provide a cat equipped with at least one arm made of aluminum, which use less amount of starting material for your manufacturing.

Another object of the invention is to provide a cat equipped with at least one arm made of aluminum that results cheaper than conventional.

To accomplish these objectives, the invention claim a nut made by combining two bodies of different materials, synthetic and metallic, of the which metal body generally has a U shape, in whose wings make outstanding necks outward, properly aligned, through which the insertion of the nut into the wings of the corresponding arm of the cat.

The U-shaped piece is equipped with its base of a hole centered for the passage of the threaded spindle, receiving  between its wings another piece of synthetic material usually with cylindrical shape and hollow longitudinally, the interior being threaded for the passage of said spindle.

Both bodies, the synthetic and the metallic, are equipped with corresponding means both to control the possible axial movements of the synthetic inner body in relationship with the metallic outer body, such as to prevent rotation of said inner body within said outer body. So and as will be described later, these means can be of types different.

The nut thus made is arranged in the arm of the cat, first disposing the metal body, which it is pressed under the wings provided by the section in U of the aforementioned arm, such that the two necks outstanding, made, for example, by drawing, are housed in the corresponding holes of said wings.

Next, the synthetic piece is arranged in the inside of the metal part, embedding one of its ends in the hole in the base of the metal part.

As noted, this synthetic piece is controlled between the inner walls of the wings of the piece metal, such that the rotation of said piece is avoided synthetic In turn, the enabled media corresponding to both metallic and synthetic pieces allow the latter to remain also controlled in its possible axial displacements within of said metal part.

As can be deduced, the metal part is the part of the nut that is under stress and does not occur wear or mismatches due to metallic contact between the arm and said piece. The synthetic nut piece works under compression within said metal part and for that reason its useful life can Be considered unlimited.

To achieve the other objectives of the invention, an arm made of aluminum is proposed, as He has commented previously.

In the same way as in the conventional technique the front portion of the cat's arm rotates in the body, in the Y-shaped cats the front portion that supports the jaw it comprises wings or sides whose height is substantially greater to the greater height of the rest of the wings of the arm.

This makes it necessary to have to start from a sheet or plate whose width corresponds to the sum of the lengths of the base of the U-section and the heights of the wings at the point of the arm that is of greatest height, which corresponds to the end where the jaw is positioned.

According to the invention, the initial height of the plate or the plate can be reduced, so that it achieves considerable material savings, which translates into a notable reduction in the cost of the raw material, aluminum, very important detail that makes it possible to reduce the production of cat.

For this, the invention proposes an arm with a wing height at the end of the jaw position substantially equal to the maximum height of the wing in the rest of the arm. This is achieved by providing the end of the base in U shape of the jaw end a curvature connected to the exterior, a curvature that rises towards the front of the arm at said end of the jaw position.

As will be described later in relationship with the figures, the convex curvature outward it can also reach the lower edges of the wings in the arm end

In the sheets of figures attached are they appreciate in greater detail and concretion all the details of the invention, and in them and without any limiting character is represented the next.

Description of the drawings

Figure 1 is an elevation view of a cat of the Y-type that includes both aspects of the invention.

Figure 2 is a perspective view that shows a preferred solution of the nut, according to the invention.

Figures 3, 4 and 5 are three views of the nut of Fig. 2.

Figure 6 is a perspective view of a preferred solution of the synthetic part of the nut, according to the invention.

Figures 7, 8 and 9 show three views of the synthetic part of the nut of Fig. 6.

Figure 10 is a perspective view of the metal part of the nut, according to the invention.

Figures 11, 12 and 13 are three views of the metal part of Fig. 10.

Figures 14 and 15 are an elevation view and a top view thereof for a conventional arm.

Figure 16 is an arm development conventional.

Figures 17 and 18 are an elevation view and a top view thereof for the arm according to the invention.

Figure 19 is a development of the arm shown in Fig. 17 and 18.

Detailed statement of the invention

With reference to figure 1, a cat is observed in Y with a main body 1 articulated to a foot of seat 2, a arm 3 articulated to body 1 by axis 9, said arm receiving at its free end the jaw 7, in which the body is received vehicle. A crank 6 is connected to the threaded spindle 4, which connect nut 5 to body 1 and crossbar from position 10 to arm 3. In arm 3 the convex curvature zone 8 is observed outward that constitutes one of the objects of the invention.

With reference to figure 2 and figures 3, 4 and 5, the nut assembly with the metal part 11 can be seen U-shaped outer and inner synthetic piece 12. The piece metallic 11 presents on its wings the outstanding 13 necks and aligned, so eat the hole 14 made in its base to allow the passage of spindle 4 and the seat of the synthetic piece to through one of the 12 'conical chamfers of the synthetic piece 12.

The synthetic piece 12, meanwhile, is endowed of a hollow and longitudinally threaded cylindrical configuration inside to house the threaded spindle.

In this preferred, non-exclusive solution, the synthetic piece is controlled in rotation by means of the projections rectangular 15 of which it is equipped, whose lateral faces 15A (Fig. 6) are adjusted or close to the inner faces of the wings of the metal part, whereby the synthetic part is unable to turn once received in the piece metallic

You can also see how the front portion of the wings show 16 facing pins in which supports one of the outer faces 29 of the projections 15, preventing the axial movement of this synthetic piece.

It is understood that there can be innumerable practical solutions, both to prevent the rotation of the piece synthetic 12 inside the metal part 11 as for avoid axial movement of the synthetic part in said inside.

It is possible to adjust or not the faces 15A of the rectangular projections 15 to the inner surface of the wings.

It would also be possible to make entrees in inner faces of the wings to disappoint the extreme faces Oversized 15A, which would also carry out the axial control of the synthetic part 12.

Although two projections 15 are procured in the piece synthetic 12, a single protrusion could well be used, etc.

Technically, any expert can engineer solutions to achieve this goal very easily, well understood that as mentioned above may exist countless possibilities.

In the same way, the axial control of the piece synthetic 12 inside the metal part 11 can be implemented as described by any other means, medium. For example, making holes in the base of the piece metal in which protrusions of the synthetic part are received by pressure, by clicking, etc.

In this regard, also note that any expert can arbitrate means mutual-corresponding between both pieces for avoid axial play of the synthetic piece.

With reference to figures 6, 7, 8 and 9, can deduce the particular geometry of the synthetic part 12, whose ends 12 'are chamfered for the mouth of one of them in the hole of the base of the metal piece. Both rectangular projections 15 are evenly distributed, being its lateral faces 15A those responsible for carrying out the anti-rotation of the piece and faces 18 and 19 the responsible for axial control.

Figures 10, 11, 12 and 13 show the shape of the metal piece 11, of which the necks 13 stand out for accommodation in the wings of arm-body 1, the hole 14 for the passage of the spindle 4 and the seat of the zone chamfered 12 'of the synthetic part 12, as well as the pins front 16 for axial control of said part.

With reference to figures 14 and 15, it is shown the elevation of a conventional arm with its end 9 to establish its turn in body 1 and its other end for the arrangement of the jaw 7 and point 10 for mooring the crossbar.

According to this traditional and known technique, the height between upper end 20 and lower 21, 22 is substantially greater than the maximum height of the rest of the arm determined in this case by the corresponding height between ends A and B of the wings. All this implies that, when the arm starting from the plate or longitudinal plate, a plate that includes the development of the arm of figure 16, according to the  which width of this plate must be at least equal to the distance between the curvatures of positions 20, usually a little older.

If the scope of the cat's arm is observed 25 according to the invention, figure 17, it is appreciated that the lower end left 26 is configured with a curved area 26 convex towards outside, such that the height of the front end 27 between its upper point 20 and lower point 24 is substantially equal to the maximum height between ends A and B of the rest of the arm wing. Thus, with reference to Figure 19, the width of the plate of departure is limited by distance A-B, substantially equal to the distance between points 20, getting against the development of the conventional arm a sensitive saving of material, being the width of the smaller plate.

This translates into material savings of the width corresponding to each longitudinal end, with a band length equal to that of the arm, usually slightly greater and double. Being the initial aluminum material, which is considered expensive, the saving of material supposes a considerable economic saving of the arm and consequently of the cat, this being Another object of the invention.

It should be noted, once described the nature and advantages of this invention, the non-limiting nature of the  same as the changes in the form, matter or dimensions of its constituent parts will not alter in any way its essentiality, as long as they do not imply a substantial variation in the set.

Claims (5)

1. Cat, applicable either to scissor-type cats or Y-type cats, which have a body (1) mounted on a support foot (2) and an arm (3) that rotates in said body, the end being upper body (1) and arm (3) connected to each other by means of a spindle (4) that passes through a nut (5) of said body and is connected to a crossbar of the arm (3) that supports a jaw, the nut being (5) composed of two pieces of different material connected to each other, metallic and synthetic respectively, with the arm (3) at its end (20) of the jaw engaging a dimension or height of the upper wing to the greater average height between the ends (A) of the wings and the base (B) thereof, which is characterized by, - a nut (5) based on a metal body (11) U-shaped, on whose wings or sides necks are established (13) protruding out and aligned for insertion into holes in the wings of the body (1) and in a hole (14) centered on its base for the passage of the spindle (4), being received in the inside hollow of this piece another piece of synthetic material (12) which occupies a position perpendicular to said base and is threaded internally for the passage and connection of the spindle, - corresponding means provided in the metallic body (11) outside and in the synthetic body (12) inside  which control the possible relative axial movements of said body (12) in relation to said body (11), - corresponding means in the metal body (11) outside and in the synthetic body (12) inside to prevent the rotation of said inner body in relation to the outer, - one arm (25) of cross section in shape of U in which the highest height of the wings, from its base (B) to the upper free end (A) of said wings, in the portion of the same from its front end where the jaw (7), is substantially equal to the maximum height or dimension (27) between the lower front end (24) of the base (B) and the upper (20) in which the jaw is accommodated, presenting the base (B) in its front portion (8) an area of convex curvature towards the outside length that extends to the front front from the arm. 2. Cat according to claim 1, characterized in that the inner synthetic part (12) is preferably cylindrical in shape and is provided with at least one centered projection (15) of a quadrangular plan which provides two parallel faces on its sides (15A) which are vertical and are at least close to the inner side faces of the wings of the outer metal part (11), the free ends of the cylindrical portions of the inner part (12) being provided with annular chamfers (12 '), one of which it accommodates the entrance of the hole (14) of the base of the outer metal part (11). 3. Cat according to claim 1, characterized in that the means for controlling the inner synthetic part (12) in its housing in the outer metallic part (11) consist of two inward and opposite pins (16) made at the ends of the wings of said outer piece, on whose pins the cylindrical portion of the inner piece (12) rests, while one of the projections (15) of said inner piece being supported on the rear faces of said pins. 4. Cat according to claim 1, characterized in that the axial control means between the outer body (11) and the inner (12) are established between the projections (15) of said inner body and the side walls of the outer wings. 5. Cat according to claim 1, characterized in that the axial control means between the outer body (11) and the inner (12) are established between the projections (15) of said inner body and the walls of the base of the outer body.