Automobile windscreen wiper spring tensioner

Abstract

A tensioner of an automobile windscreen wiper spring relates to devices for providing visibility while driving, and to vehicles. The technical result, which consists in providing the desired force with which a windscreen wiper arm is pressed against a windscreen in the case of different degrees of extension of the spring, is achieved by a tensioner structure which makes it possible to adjust the distance between the hooks of an extension spring on the arm of a windscreen wiper. This capability for adjustment, provided by turning a screw or, alternatively, a bolt, makes it possible to select the desired force with which the windscreen wiper arm is pressed against the windscreen on the basis of the extension of the extension spring, thereby providing an increase in the force with which the windscreen wiper arm is pressed against the windscreen.

Description

[0001] CAR WIPER SPRING TENSIONER

[0002] DESCRIPTION

[0003] The spring tensioner of the automobile windshield wiper belongs to the devices for ensuring visibility during movement, and vehicles [B6OS1 / OO, B6OS1 / 2O, B6OS1 / 32, B60S1 / 34, B60S1 / 38],

[0004] A WINDSHIELD WIPER LEVER is known from the prior art [RU2160198C1-2000-12-10]. The invention relates to transport equipment and can be used in the design of a windshield wiper arm for an automobile windshield wiper. The prototype of the claimed invention uses the design of a windshield wiper arm (application PCT 89 / 00936, MK B60S1 / 34, published 09.02.89), which includes a drive head with a recess, a hinge axis and an arbor axis located in a recess, a lever housing with a lever pivotally connected to the drive head, a coil spring and an arbor. The arbor is engaged with the arbor axis, and the coil spring connects the arbor to the lever. The advantage of the prototype is the presence of a recess on the hinge axis, which allows the earring to be centered in the recess when the lever is moved to the idle position.A design flaw is the lack of means for centering the coil spring in the operating position of the lever housing relative to the head, which allows the clevis to move along the surface of the clevis axis toward one of the recess walls and rub against the wall of the drive head recess. The invention solves the problem of centering the clevis in the drive head recess. This objective is achieved in the claimed windshield wiper arm design, which includes a drive head with a recess, a hinge axis and a clevis axis located in a recess, a lever housing with a lever pivotally attached to the head axis, a clevis engaged with the clevis axis, and a coil spring connecting the lever to the clevis. The problem is solved by making a notch on the clevis axis, the width of which is greater than or equal to the radius of the clevis cross-section. Figure 1 shows the windshield wiper arm. Figure 2 shows the connection of the clevis with the clevis axis of the drive head. The invention can be implemented in the arrangement of a windshield wiper arm (see Fig.1), including a drive head 1 with a recess 2, a hinge axis 3 and a hinge axis 4 located in a recess 2, a lever housing 5 with a lever 6 pivotally fixed on axis 3, a coil spring 7, one end of which is connected to the lever 6, and an earring 8 connects the second end of the spring 7 to the earring axis 4. To implement the invention, a recess 9 can be formed in the central part of the earring axis 4 (see Figure 2). The end of the earring 8 is partially recessed into the recess 9 intended for engagement with the earring axis 4. To reliably hold the end of the earring 8 in the central part of the earring axis 4, the width of the recess 9 is made equal to or greater than the radius of the cross-section of the earring 8. A disadvantage of this analogue is insufficient tightness of pressing the windshield wiper blade to the windshield. The closest in technical essence is the WIPER SPRING TENSIONER [https: / / plastik-avto.[ru / collection / natyazhitel-pruzhiny-dvornika-stekloochistitelya], which is a rectangular bar made of polyamide, containing a stop rib for mounting in the windshield wiper trapezoid and a tension rib, which ensures movable contact between the windshield wiper spring tensioner and the spring mounting axis. A rectangular opening extends from the center of the windshield wiper spring tensioner toward the spring mounting axis. One side of the opening, located on the spring side, has a rounded shape and is designed for mounting the spring, hence its name, the retaining rib. The tension force of the windshield wiper spring is determined by using tensioners with different tension distances.The disadvantage of this analogue is the need to use several tensioners with different tension distances to ensure the required spring tension force and the density of the wiper contact.

[0005] The technical result of the invention consists in providing the required force of pressing the windshield wiper arm to the glass at different spring extension values.

[0006] The claimed technical result is achieved due to the fact that the spring tensioner of the automobile windshield wiper is made in the form of a bar, along the longitudinal axis of which a through slot is made, in the end in the recess formed by the slot there is a hole made into which a fastening element is inserted, in the fastening element there is a hole made with the possibility of mounting the hook of the tension spring.

[0007] Specifically, the fastening element is a screw with an elongated head with a hole, secured with a nut on the end opposite the cutout. Specifically, the fastening element is a bolt, the head of which protrudes from the end opposite the cutout, and secured on the side of the slot with an elongated nut with a hole.

[0008] In particular, a through slot is made up to half the length of the bar.

[0009] In particular, the bar is made rectangular.

[0010] In particular, the end of the strip on the side where the slot is made has a concave rounding.

[0011] Brief description of the drawings.

[0012] Fig. 1 shows the options for placing the tensioner.

[0013] Fig. 2 shows a variant of the implementation of a tensioner with a base in the form of a rectangular bar, along the longitudinal axis of which a through slot is made.

[0014] Fig. 3 shows a variant of a tensioner screw with a base in the form of a rectangular strip, along the longitudinal axis of which a through slot is made.

[0015] Fig. 4 shows a variant of mounting a tensioner with a base in the form of a rectangular strip, along the longitudinal axis of which a through slot is made, with a screw and nut installed.

[0016] Fig. 5 shows a variant of mounting a tensioner with a base in the form of a rectangular bar, along the longitudinal axis of which a through slot is made in the windshield wiper arm with a pin.

[0017] Fig. 6 shows a variant of mounting a tensioner with a base in the form of a rectangular bar, along the longitudinal axis of which a through slot is made, with an installed bolt and nut.

[0018] Fig. 7 shows the nut used in the tensioner together with the bolt.

[0019] Figures 1-7 show: 1 - windshield wiper arm, 2 - tension spring, 3 - pin, 4 - hook, 5 - base, 6 - fastening, 7 - through slot, 8 - through hole, 9 - screw, 10 - elongated head, 11 - hole, 12 - nut, 13 - mating rounding, 14 - bolt, 15 - elongated nut, 16 - nut hole.

[0020] Implementation of the invention

[0021] The tensioner is mounted on the windshield wiper arm 1 behind the extension spring 2, which is secured with its upper hook to the pin 3 or to the catch 4 (Fig. 1). The tensioner comprises two zones, a base 5 and a fastening 6 (Fig. 2). The base 5 ensures the tensioner is retained in the windshield wiper arm 1, and the fastening 6 provides additional tension to the extension spring 2 and strengthens the contact. The tensioner is made in the form of a bar (in the embodiment, a rectangular one), along the longitudinal axis of which a through slot 7 is made (in the embodiment, up to half the length of the rectangular bar (Fig. 2)). In the middle of the slot, a through hole 8 is made, into which a fastening element is installed.

[0022] In the embodiment, a through hole 8 is made in the middle of the slot, into which a screw 9 with an elongated head 10 (Fig. 3) is installed. In the elongated head 10, a hole 11 is made for mounting the hook of the tension spring 2. The screw 9 is fixed in the base 5 (the end opposite the cutout) with a nut 12 (Fig. 4). Moreover, in the embodiment, the side of the tensioner adjacent to the pin 3 is made with a mating (concave) rounding 13 (Fig. 5).

[0023] In the embodiment (Figs. 6 - 7), the tensioner is made in the form of a rectangular bar, along the longitudinal axis of which a through slot 7 is made up to half the length of the rectangular bar (Fig. 2). In the middle of the slot, a through hole 8 is made, into which a bolt 14 is installed (Fig. 6). In this case, the head of the bolt 14 protrudes from the base 5. On the side of the slot, the bolt 14 is fixed with an elongated nut 15 with a hole in the nut 16 for mounting the hook of the tension spring 2 (Fig. 7). In this case, the side of the tensioner adjacent to the pin 3 is made with a mating (concave) rounding 13.

[0024] The invention is used as follows

[0025] In automobiles, windshield wiper arm 1 is pressed against the windshield by extension spring 2. The most common spring attachment options are pin 3 or hook 4, as shown in Fig. 1. During vehicle operation, the pressing force of windshield wiper arm 1 may weaken over time due to a decrease in the stiffness of extension spring 2. Also, in a new vehicle, the pressing force may be insufficient for effective cleaning of the windshield. To increase the pressing force of windshield wiper arm 1, increase the distance between the hooks of extension spring 2 on windshield wiper arm 1. Tensioners made of plastic or metal can be used for this purpose. In this case, the tensioner is located inside windshield wiper arm 1, extension spring 2 is hooked onto opening 11, and its mating rounding 13 rests against pin 3 or hook 4.The technical result - ensuring the required force of pressing the windshield wiper arm to the glass at different values ​​of the spring extension is achieved due to the fact that the design of the tensioner provides for the regulation of the distance on the windshield wiper arm 1 between the hooks of the extension spring 2. At the same time, due to the presence of adjustment by rotating a screw or, alternatively, a bolt, it becomes possible to select the required increase in the force of pressing the windshield wiper arm to the glass depending on the extension of the extension spring 2, thereby ensuring an increase in the force of pressing the windshield wiper cable to the glass.

[0026] Implementation examples

[0027] Examples of the tilted device are shown in Figs. 2-7. Field experiments demonstrated that the proposed solution reliably maintains the required tension level with the extension spring extended to 5 mm. Furthermore, by adjusting the fastening element over the entire extension range from 0 to 5 mm, the required force was achieved for pressing the wiper arm against the windshield.

Claims

FORMULA 1. The spring tensioner of a car windshield wiper is made in the form of a bar, along the longitudinal axis of which a through slot is made, in the end in the recess formed by the slot there is a hole made into which a fastening element is inserted, in the fastening element there is a hole made with the possibility of mounting the hook of the tension spring.

2. The tensioner according to paragraph 1, characterized in that the fastening element is a screw with an elongated head with a hole, the screw is secured with a nut at the end opposite the cutout.

3. The tensioner according to paragraph 1, characterized in that a bolt acts as a fastening element, the head of the bolt protrudes from the end opposite the cutout, and on the side of the cutout the bolt is secured with an elongated nut with a hole.

4. The tensioner according to item 1, characterized in that the through slot is made up to half the length of the bar.

5. The tensioner according to item 1, characterized in that the bar is made rectangular.

6. The tensioner according to item 1, characterized in that the end of the bar, on the side of which the slot is made, is made with a concave rounding.

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