Patent Description:
A car wiper is disposed outside the glass and connected to a wiper driving arm. The wiper is driven by the driving arm to swing over the glass to remove rain, snow, and/or dirt so as to keep a driver's good vision and increase drive safety.

Also, a desirable wiper structure has to make a blade be closely attached and evenly pressed on a vehicle's windshield to effectively remove dirt or dust on the glass. However, different vehicles' glass has different curvatures. A wiper blade is hard to be evenly pressed on the glass. Thus, the pressure from a wiper blade driven by a driving arm is not even. This causes the wiper blade and the glass cannot be kept in close attachment.

<CIT> discloses a wiper blade having a wiper strip, a force distribution structure having opposite ends, the wiper strip connected to the force distribution structure, and a cover, wherein the cover is made from a hydrophobic material, a material exhibiting hydrophobic properties, or a material having a water contact angle that is greater than <NUM> degrees.

<CIT> discloses a windshield wiper having an even pressing force which is connected to a driving arm and including a primary wiper frame, two auxiliary wiper frames, connecting frames, and a wiper blade. The primary wiper frame includes a fixing base connected to the driving arm. The auxiliary wiper frames are disposed on both ends of the primary wiper frame. Each auxiliary wiper frame includes an elastic piece and a pivotal base fixed to the elastic piece and pivotally connected to the primary wiper frame. The connecting frames are evenly provided on each auxiliary wiper frame. Each connecting frame includes a pressing piece and buckling brackets. The wiper blade is disposed through the buckling brackets to be connected below the pressing piece.

In view of this, the inventors have devoted themselves to the above-mentioned related art, researched intensively and cooperated with the application of science to try to solve the above-mentioned problems. Finally, the invention which is reasonable and effective to overcome the above drawbacks is provided.

An object of the disclosure is to provide a wiper structure that may balance pressure, which makes a wiper blade be able to evenly press and be attached on a work surface to effectively perform a sweeping operation.

To accomplish the above object, the independent claim defines a wiper structure that may balance pressure, which includes a main wiper frame, a pair of secondary wiper frames, multiple engaging frames, and a blade. The main wiper frame includes a fixing seat. A pair of secondary wiper frame is connected to two ends of the main wiper frame. Each secondary wiper frame includes a flexible sheet. The flexible sheet is disposed with multiple sliding troughs. Each sliding trough includes a trough length and a trough width in size. The trough length is greater than the trough width. The engaging frames are evenly disposed on each secondary wiper frame. Each engaging frame includes a pressing wing and a sliding block. The pressing wing is disposed with an opening. The sliding block includes a neck bar passing through the opening. The neck bar has a passing diameter. The passing diameter is less than the trough width. The sliding block of each engaging frame passes through the opening and abuts against each sliding trough through the neck bar. And the blade is connected under the pressing wings.

The invention is characterized in that the the passing diameter is less than the trough width by at least <NUM>, wherein the sliding block is slidable in each sliding trough with a change of an external force exerted on corresponding one of the secondary wiper frames. Further, the pressing wing comprises an indented angle defined at a position of the opening and a slant angle defined at two distal ends thereof respectively, and the indented angle and the slant angle are between <NUM> degrees and <NUM> degrees respectively; and the flexible sheet comprises a bending angle defined at a middle portion thereof and an extending angle defined at two distal ends thereof, and the bending angle and the extending angle are between <NUM> degrees and <NUM> degrees respectively. In comparison with the related art, the engaging frames of the disclosure are evenly disposed on each secondary wiper frame, the secondary wiper frame is provided with a sliding trough, and each engaging frame includes a pressing wing and a sliding block. The flexible sheet is disposed with sliding troughs. The neck bar of the sliding block has a passing diameter less than the width of the sliding trough. Thus, after the sliding block passes the sliding trough of the flexible sheet, the sliding block is slidable in each sliding trough with a change of an external force exerted on corresponding one of the secondary wiper frames to balance the forces exerted on the pressing wing. As a result, the blade connected under the pressing wing may be evenly pressed to make the blade be attached on the vehicle glass more closely to effectively perform the sweeping action to enhance utility.

The technical contents of this disclosure will become apparent with the detailed description of embodiments accompanied with the illustration of related drawings as follows. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

Please refer to <FIG> and <FIG>, which are a perspective schematic view and an exploded view of the wiper structure that may balance pressure of the disclosure. The wiper structure <NUM> that may balance pressure of the disclosure which includes a main wiper frame <NUM>, a pair of secondary wiper frames <NUM>, multiple engaging frames <NUM> and a blade <NUM>. The engaging frames <NUM> are connected to the blade <NUM> and fixed on the pair of secondary wiper frames <NUM>. The pair of secondary wiper frames <NUM> are symmetrically disposed on the main wiper frame <NUM> to constitute the wiper structure <NUM>. More details are described below.

The main wiper <NUM> frame includes a fixing seat <NUM>. The fixing seat <NUM> has a pivot <NUM>. In the embodiment, the main wiper frame <NUM> further includes a set of fixing arms <NUM> which is connected to two lateral ends of the fixing seat <NUM>. An end of each fixing arm <NUM> is formed with a first pivot hole <NUM>. In detail, the pivot hole <NUM> is connected to a driving arm (not shown in figures).

The pair of secondary wiper frames <NUM> is connected to two ends of the main wiper frame <NUM>. Each secondary wiper frame <NUM> includes a flexible sheet <NUM>. In the embodiment, each secondary wiper frame <NUM> further includes a pivoting seat <NUM> and a passing rod <NUM>. The pivoting seat <NUM> has a second pivot hole <NUM>. Also, each secondary wiper frame <NUM> is pivotally connected to the fixing arm <NUM> of the main wiper frame <NUM> by passing the passing rod <NUM> through the first pivot hole <NUM> and the second pivot hole <NUM>.

The engaging frames <NUM> are evenly disposed on each secondary wiper frame <NUM>. Each engaging frame <NUM> includes a pressing wing <NUM> and a sliding block <NUM>. In addition, each engaging frame <NUM> further includes multiple engaging sheets <NUM> disposed on the pressing wing <NUM>. It is noted that the amount of the engaging frames is not limited, but each secondary wiper frame <NUM> is disposed with the same amount of the engaging frames <NUM>.

Further, the blade <NUM> is made of rubber and connected under the pressing wing <NUM>. In the embodiment, the blade <NUM> is connected on the bottom of the pair of secondary wiper frames <NUM> by the engaging sheets <NUM> of the engaging frames <NUM>.

Please refer to <FIG>, which are an assembled view of the secondary wiper frame and the engaging frame, an exploded view of the secondary wiper frame and the engaging frame and a cross-sectional view of the pressing wing of the disclosure. In the embodiment, each secondary wiper frame <NUM> is disposed with, but not limited to, two sets of engaging frames <NUM>. The two sets of engaging frames <NUM> are separately disposed at two ends of the secondary wiper frame <NUM>.

As shown in <FIG>, the pivoting seat <NUM> of the secondary wiper frame <NUM> includes a first connecting seat <NUM> and a second connecting seat <NUM>, which are connected to two sides of the flexible sheet <NUM>. Moreover, the flexible sheet <NUM> is disposed with multiple sliding troughs <NUM>. Each sliding trough <NUM> has a trough length L and a trough width W in size.

The pressing wing <NUM> is disposed with an opening <NUM>. The sliding block <NUM> of the engaging frame <NUM> includes an engaging trough <NUM> and a neck bar <NUM> passing through the opening <NUM>. The neck bar <NUM> has a passing diameter d and a passing height h. The passing height h is configured correspondingly to a thickness of the flexible sheet <NUM>. As a result, the flexible sheet <NUM> may be passed in the engaging trough <NUM> and limited by the opening <NUM> to be unmovable so as to make the neck bar <NUM> engage with the flexible sheet <NUM> and be inseparable from the flexible sheet <NUM>. In some embodiments, a thickness of the flexible sheet <NUM> is less than or equal to the passing height h.

The trough length L is greater than the trough width W and the passing diameter d is less than the trough width W. Thus, after each sliding block <NUM> passes the opening <NUM> of the pressing wing <NUM>, the sliding block <NUM> abuts against each sliding trough <NUM> through the neck bar <NUM>. In some embodiments, the passing diameter d is less than the trough width W by at least about <NUM>. In addition, the trough length L is approximately <NUM> to <NUM> times greater than the passing diameter d.

In the embodiment, a thickness of the flexible sheet <NUM> and the passing height h are approximately <NUM>. In some embodiments, a side of the neck bar <NUM>, which is slidable relative to the sliding trough <NUM>, is formed with a plane <NUM> for facilitating relative movement.

In the embodiment, the passing diameter d is about <NUM>, the trough width is about <NUM> and the trough length L is about <NUM>. When assembling, the sliding block <NUM> passes through the opening <NUM> of the pressing wing <NUM> first, then the sliding block <NUM> with the pressing wing <NUM> passes through the sliding trough <NUM> and the neck bar <NUM> is engaged with the sliding trough <NUM>, and finally the sliding block <NUM> is rotated to make the sliding block <NUM> be engaged with the sliding trough <NUM> in a cross manner. As a result, the sliding block <NUM> is connected to the flexible sheet <NUM> to be inseparable from the sliding trough <NUM>.

Because the thickness of the flexible sheet <NUM> is less than the passing height h of the sliding block <NUM>, the blade <NUM> drives the pressing wing <NUM> and the sliding block <NUM> to move upward when the blade <NUM> is being pressed. At the same time, a gap is formed between the flexible sheet <NUM> and the sliding block <NUM> for facilitating the movement of the sliding block <NUM> relative to the flexible sheet <NUM>.

It is noted that the bottom part of the sliding block <NUM> has two blocking walls <NUM> and an abutting surface <NUM>. After the sliding block <NUM> passes through the opening <NUM> and is rotated to be placed in the pressing wing <NUM>, the blocking walls <NUM> of the bottom part of the sliding block <NUM> abut against the inner walls of the pressing wing <NUM> to be unrotatable. Also, the sliding block <NUM> may move upward or downward relative to the flexible sheet <NUM> through the abutting surface <NUM> to facilitate the movement of the sliding block <NUM> relative to the flexible sheet <NUM>.

Please refer to <FIG> and <FIG>, which are a cross-sectional view of the pressing wing and a cross-sectional view of the flexible sheet of the disclosure. As shown in <FIG>, the pressing wing <NUM> of the disclosure is formed with an indented angle A at the position of the opening <NUM>. In addition, each of two distal ends of the pressing wing <NUM> is formed with a slant angle B. The indented angle A and the slant angle B are separately located on two sides of the pressing wing <NUM>. The indented angle A and the slant angle B facilitate the movement of the sliding block <NUM> when the pressing wing <NUM> is under external force. In some embodiments, each of the indented angle A and the slant angle B is, but not limited to, approximately between <NUM> degrees and <NUM> degrees.

Moreover, as shown in <FIG>, a middle portion of the flexible sheet <NUM> of the disclosure is disposed with a bending angle C. Additionally, each of two distal ends of the flexible sheet <NUM> is formed with an extending angle D. Also, the bending angle C and the extending angle D facilitate the movement of the sliding block <NUM> when the flexible sheet <NUM> is under external force. In some embodiments, each of the bending angle C and the extending angle D is, but not limited to, approximately between <NUM> degrees and <NUM> degrees.

Please refer to <FIG>, which are a cross-sectional view of the wiper structure along another side direction, a schematic view of sliding block of the engaging frame before moving, and a schematic view of sliding block of the engaging frame after moving. As shown in <FIG>, the main wiper frame <NUM> of the wiper structure <NUM> of the disclosure is connected with the pair of secondary wiper frames <NUM>, and multiple engaging frames <NUM> are evenly disposed on the pair of secondary wiper frame <NUM> and connected with the blade <NUM>. Also, the wiper structure <NUM> is driven by the driving arm to move.

Please refer to <FIG>. The blade <NUM> of the disclosure is connected under the pressing wing <NUM>. Also, the wiper structure <NUM> is disposed over a vehicle glass <NUM>. In the embodiment, the vehicle glass <NUM> is a curved surface, the blade <NUM> is not attached on the glass surface when the wiper structure <NUM> is driven by the driving arm, so the force exerted on the pressing arm <NUM> is not even and makes the wiper structure <NUM> be unable to closely sweep the vehicle glass <NUM>.

It is noted that the sliding block <NUM> passing through the pressing wing <NUM> is slidable in each sliding trough <NUM> with a change of an external force exerted on corresponding one of the secondary wiper frames <NUM> to make the action force on the pressing wing <NUM> reach a balance state.

In the embodiment, the force exerted on the pressing arm <NUM> is not even, so the action force F1 exerted at the left of the pressing wing <NUM> is greater than the action force F2 exerted at the right of the pressing wing <NUM>. As a result, the sliding block <NUM> in the sliding trough <NUM> moves rightward to balance the forces exerted on the pressing wing <NUM>.

Claim 1:
A wiper structure (<NUM>), comprising:
a main wiper frame (<NUM>), comprising a fixing seat (<NUM>);
a pair of secondary wiper frame (<NUM>), connected to two ends of the main wiper frame (<NUM>), each secondary wiper frame (<NUM>) comprising a flexible sheet (<NUM>), the flexible sheet (<NUM>) comprising multiple sliding troughs (<NUM>), each sliding trough (<NUM>) comprising a trough length (L) and a trough width (W) in size, and the trough length (L) greater than the trough width (W);
multiple engaging frames (<NUM>), evenly disposed on each secondary wiper frame (<NUM>), each engaging frame (<NUM>) comprising a pressing wing (<NUM>) and a sliding block (<NUM>), the pressing wing (<NUM>) comprising an opening (<NUM>), the sliding block (<NUM>) comprising a neck bar (<NUM>) passing through the opening (<NUM>), the neck bar (<NUM>) comprising a passing diameter (d), the passing diameter (d) less than the trough width (W), the sliding block (<NUM>) of each engaging frame (<NUM>) passing through the opening (<NUM>) and abutting against each sliding trough (<NUM>) through the neck bar (<NUM>); and
a blade (<NUM>), connected under the pressing wings (<NUM>), characterized in that:
the passing diameter (d) is less than the trough width (W) by at least <NUM>, wherein the sliding block (<NUM>) is slidable in each sliding trough (<NUM>) with respect to a change of an external force exerted on corresponding one of the secondary wiper frames (<NUM>);
the pressing wing (<NUM>) comprises an indented angle (A) defined at a position of the opening (<NUM>) and a slant angle (B) defined at two distal ends thereof respectively, and the indented angle (A) and the slant angle (B) are between <NUM> degrees and <NUM> degrees respectively; and
the flexible sheet (<NUM>) comprises a bending angle (C) defined at a middle portion thereof and an extending angle (D) defined at two distal ends thereof, and the bending angle (C) and the extending angle (D) are between <NUM> degrees and <NUM> degrees respectively.