ES2617058A1 - Precision pliers (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Precision pliers, comprising a first arm and a second arm that are joined together forming a rotating joint by joining their respective first and second articulation bases that allows relative movement between the first and second arms, rotating articulation that accommodates in recesses provided therein a spring and a bearing ball housed between the first and second articulation base, which incorporates a single first recess (9) in the first articulation base (3) of configuration compatible with the joint housing of the spring (7) with tabs (7a) and bearing ball (8), and a single second recess (10) of identical characteristics to the first recess (9) in the second articulation base (4), recesses first (9) and second ( 10) with spherical bottom configuration in the first (11) and second (12) bearing zones where the bearing ball (8) is located. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

Precision pliers.

FIELD OF THE INVENTION

This invention concerns a precision pliers, of which they comprise a first arm and a second arm connected to said first arm through the union of their respective first and second articulation bases forming a rotating joint, housed inside said rotating joint a spring that moves the pliers heads to the opening position and stopper elements that limit the maximum opening of said pliers heads. 10

STATE OF THE PREVIOUS TECHNIQUE

 At present and as a reference to the state of the art, it is usual and known to use precision pliers formed from the union of a first arm with a second arm, said union made by the respective first and second articulation bases forming a rotating joint that allows the relative movement of said first and second arms, a rotating joint containing a spring housed in recesses incorporating the articulation bases, which keeps the first and second heads of said pliers in the open position.

 In this type of products, it is necessary to include stop elements to limit the maximum opening between the pliers, opening obtained due to the action of the spring.

 For this, there are different solutions in the market, with the use of arms whose articulation bases are designed in such a way that they have limitation surfaces on their sides, which in the open position are facing each other and in mutual contact, preventing the use continuation of the opening of the pliers heads under the action of the spring. These types of stop elements make the dimensions of these rotating joints larger, being a solution incompatible with pliers that require small sizes. 30

 Another usual solution in the pliers present in the market to limit its maximum opening, is the use of springs in which its effort is calculated in such a way that it reaches its resting position with the configuration of maximum opening of the pliers, so that said spring does not exert any effort in that position. The problem that causes this solution is that this system begins to generate a malfunction of the pliers before a certain number of uses,

due to the loss of the initial properties of the spring, suffering permanent deformations, and that in the long run, the maximum opening foreseen in its design is exceeded.

 Finally, it is known to use a ball bearing housed between cavities arranged in each of the first and second articulation bases, with a partial volume of said ball bearing located in one of 5 cavities, while the remaining volume It is housed in the opposite cavity. Thus, when the spring tends to open the pliers, said ball bearing is trapped between the lateral surfaces of the cavities of each of the articulation bases, preventing the continuation of the opening. The problem with this type of configuration lies in the assembly, due to the configuration of the cavities in which the bearing ball is housed, in which said bearing ball is in continuous movement, causing assembly difficulties. In addition, undesirable noises are generated due to the release of the rolling ball when the pliers are closed, while using them.

EXPLANATION OF THE INVENTION AND ADVANTAGES 15

In the face of this state of affairs, the present invention refers to a precision plier which incorporates a single first recess in the first articulation base of configuration compatible with the joint housing of the spring with pins and of the ball bearing, and a single recess second of identical characteristics to the first recess in the second articulation base, first 20 and second recesses with spherical bottom configuration in the first and second bearing areas where the bearing ball is located.

Thanks to this configuration, a precision pliers execution is obtained in which the first and second articulation bases each contain a single recess that houses both the spring with pins and the ball bearing, thus avoiding having to make several recesses for each of the elements that are part of the joint, facilitating its manufacture. In addition, in the first and second bearing areas between which the bearing ball is located, thanks to the spherical bottom configuration, during the assembly of the pliers, the bearing ball is secured to be located in the middle of the bearing zone , avoiding the possibility that it is moving through said area, and also avoiding that due to the existence of a single recess, said ball of bearing reaches the spring housing area with pins.

Another feature of the invention is that a usual length increase of the spring pins is provided such that the positioning of said springs

pins on the first and second recesses prevent the exit of the rolling ball from the space between the first and second bearing areas.

Thanks to this configuration, when the pliers are closed by joining the first and second heads, the bearing ball is released between the first and second bearing areas, and it is the spring pins themselves that are located at the open ends of the First and second bearing areas, closing the bearing ball housing area and preventing it from leaving. This configuration also contributes to noise reduction due to the release of the rolling ball during the use of the pliers.

Another feature of the invention is that the joining of the first and second articulation bases is performed through the respective first and second through holes by coupling a compatible male closure element and a compatible female closure element.

Thanks to this configuration, the connection between both first and second arms that form the pliers is facilitated, and the use of other types of joining elements which have more prominent bodies that would protrude in excess of the outer surfaces of the bases is avoided of first and second articulation.

DRAWINGS AND REFERENCES

In order to better understand the nature of the invention, the attached drawings show an industrial embodiment that is merely illustrative and not limiting in nature.

Figure 1 shows an exploded view of the precision pliers, in which the spring (7) and the ball bearing incorporating the rotating joint are shown, with an enlarged detail in which the first recess (9) of the arm is observed first (1). 25

Figure 2a shows a view of the first articulation base (3) of the first arm (1), in which the positions of the cuts A-A and B-B are shown.

Figures 2b and 2c show sections A-A and B-B respectively, in which the spherical bottom configuration of the first bearing zone (11) is observed. 30

Figure 3 shows a view of the rotating joint, in which the elements that form it are observed, the first (9) and second (10) recesses of the first (3) and second (4) articulation bases being visible ).

Figure 4 shows a view of the precision pliers in the maximum opening position, with the ball bearing (8) in contact with the closed ends of the first (11) and second (12) bearing zones.

Figure 5 shows a view of the precision pliers in the closed position, with their first (5) and second (6) heads in contact, the bearing ball (8) being retained by the pins (7a) of the spring (7).

1.- Arm first.

  2.- Second arm. 5

  3.- First articulation base in first arm (1).

  4.- Second articulation base in second arm (2).

  5.- First head of first arm (1).

  6.- Second head of second arm (2).

  7.- Spring. 10

7a.- Spring pins (7)

  8.- Ball bearing.

  9.- First recess on the basis of the first joint (3).

10.- Second recess on the basis of second articulation (4).

11.- First bearing area in first recess (9). fifteen

12.- Second bearing area in second recess (10).

13.- Closed ends of first (11) and second (12) bearing areas.

14.- First through hole in the first articulation base (3).

15.- Second through hole in second joint base (4). twenty

16.- Male closing element.

17.- Female closure element.

EXHIBITION OF A PREFERRED EMBODIMENT

With regard to the drawings and references listed above, a preferred embodiment of the object of the invention, referring to precision pliers, which incorporates a single first recess (9) in the first articulation base is illustrated in the attached drawings (3) configuration compatible to the joint housing of the spring (7) with pins (7a) and the ball bearing (8), and a single second recess (10) of identical characteristics to the first recess (9) in the base of second joint (4), first (9) and second (10) recesses with spherical bottom configuration 30 in the first (11) and second (12) bearing areas where the bearing ball (8) is located.

Figures 1 and 3 show how the precision pliers are assembled. Starting from the first arm (1), in the first recess (9) provided in its first articulation base (3), both the spring (7) and the bearing ball (8) are placed, placing the latter in the area First bearing (11), which

It has a spherical bottom to prevent its movement through the first recess (9) during this assembly stage. As can be seen in said figures, the pin (7a) of the spring (7) corresponding to the first recess (9) is oriented towards the first bearing area (11). Once the spring (7) and the rolling ball (8) are placed in the first articulation base (3), the second arm (2) is placed, placing in the appropriate place the second recess (10) that incorporates in its second articulation base (4), so that the spring (7) is properly housed with the pin (7a) properly oriented and the bearing ball (8) coinciding with the second bearing area (12). For fixing both arms (1) (2), the male (16) and female (17) closure elements are joined, which are inserted through the first (14) and second (15) through holes of the respective first (3) and second (4) articulation bases. These closing elements (16) (17) are flush with the outer surface of the articulation bases (3) (4).

In figures 4 and 5, the behavior of the rotating joint can be observed during the use of precision pliers. In Figure 3, in which the first 15 (5) and second (6) heads are in the maximum opening position, the bearing ball (8) is trapped between the closed ends (13) of the first bearing areas ( 11) and second (12), preventing the heads (5) (6) from continuing to separate under the action of the spring (7). On the other hand, in figure 4 it can be seen how by joining said heads (5) (6), the bearing ball (8) is released from the closed ends (13), and they are the pins (7a) of the spring ( 7) those that prevent said bearing ball (8) from leaving the space between the first (11) and second (12) bearing areas.

Variations in materials, shape, size and arrangement of the component elements, described in a non-limiting manner, do not alter the essentiality of this invention, this being sufficient to be reproduced by an expert.

Claims (1)

1st.- Precision pliers, comprising a first arm and a second arm connected to said first arm forming a rotating joint by joining their respective first and second articulation bases that 5 allows relative movement between the first and second arms, rotating joint that houses a spring with pins and a ball bearing housed between the first and second articulation base, characterized by incorporating a single first recess (9) in the first articulation base (3) of configuration compatible with the joint housing of the 10 spring (7) with pins (7a) and the ball bearing (8), and a single second recess (10) of identical characteristics to the first recess (9) in the second articulation base (4 ), first (9) and second (10) recesses with spherical bottom configuration in the first (11) and second (12) bearing areas where the bearing ball (8) is located. fifteen  2nd.- Precision pliers, according to the preceding claim, characterized in that a usual length increase of the pins (7a) of the spring (7) is provided such that the positioning of said pins (7a) in the first recesses (9 ) and second (10) prevent the exit of the rolling ball (8) from the space between the first (11) and second (12) bearing areas. twenty  3.- Precision pliers, according to the preceding claims, characterized in that the joining of the first (3) and second (4) articulation bases is carried out through the respective first (14) and second (15) through holes. by coupling a compatible male closure element (16) and a compatible female closure element (17). 25