CN222425556U

CN222425556U - Toothbrush with rear tooth end face

Info

Publication number: CN222425556U
Application number: CN202421104493.9U
Authority: CN
Inventors: 黄勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2024-05-20
Filing date: 2024-05-20
Publication date: 2025-02-07
Anticipated expiration: 2034-05-20

Abstract

The utility model provides a toothbrush with a rear tooth end face, which belongs to the technical field of articles for daily use and comprises a grab handle, an L-shaped brush rod and a brush head end, wherein the grab handle comprises a grab handle and a mounting rod, the grab handle and the mounting rod are connected into a whole, an included angle between the grab handle and the mounting rod is an obtuse angle, the L-shaped brush rod is provided with a connecting end and the brush head end, the connecting end of the L-shaped brush rod is connected with the end part of the mounting rod, and one end face of the brush head end of the brush rod is provided with brush hair. The utility model has simple structure and good cleaning effect, and can realize the effective cleaning of the end face of the rear tooth.

Description

Toothbrush with rear tooth end face

Technical Field

The utility model relates to the technical field of daily necessities, in particular to a toothbrush with a rear tooth end face.

Background

Along with the improvement of the living standard of people, the health consciousness is gradually improved, the requirements on the tooth health are also improved, and the protection of the teeth is increasingly emphasized. Although there are increasing tools and means for cleaning and protecting teeth, such as manual toothbrushes, electric toothbrushes, interdental brushes (also called interdental brushes), self-adaptive interdental brushes, dental floss, tooth cleaners, mouthwashes, etc., which are used in daily use, teeth cleaning by ultrasonic waves, sand blasting, whitening, polishing, etc. can be performed at regular intervals to a dental hospital or clinic, no effective tooth cleaner for cleaning the rear end face of the rear tooth (second grinding tooth or third grinding tooth-wisdom tooth) has been available so far. The second (or third) molar, wisdom tooth, assumes a very important feeding chewing function, and is also the most difficult to clean site because it is located at the innermost side of the mouth, which is also the most prone to periodontal disease and caries where once caries and suffering periodontal disease, light effects on feeding, sleep, heart conditions, heavy loss of teeth, and even systemic disease, leading to a series of physical and mental health problems.

In order to solve the problem of cleaning the end face of the rear tooth, the following two modes are generally adopted at present:

1. Ultrasonic professional tooth cleaning is carried out at regular intervals to a dental hospital or clinic, but the time is more consuming and the cost is high. Therefore, the cleaning agent cannot be used as a daily cleaning means;

2. The existing tool for cleaning the rear tooth end face only has a large-diameter interdental brush, but because the interdental brush is not specially designed for cleaning the tooth end face, the toothbrush head is low in strength, easy to deform, small in size, poor in fitting property of the bristle shape to the tooth surface, low in cleaning efficiency, poor in ergonomics of a toothbrush handle, short in handle and inconvenient in practical operation.

Disclosure of utility model

The embodiment of the utility model aims to provide a toothbrush with a rear tooth end face, which aims to solve the problems that in order to realize the cleaning of the rear tooth end face, ultrasonic professional tooth cleaning is needed to be carried out in a dental hospital or a clinic at regular intervals, but the time is more and the cost is high, and the toothbrush is adopted to clean the teeth, so that the toothbrush with the teeth is low in intensity, easy to deform, small in size, poor in fitting property of the shape of the brush hair to the tooth face, low in cleaning efficiency, poor in ergonomics of a brush handle, short in handle and inconvenient in practical operation.

To achieve the above object, an embodiment of the present utility model provides a rear face toothbrush including:

The grab handle comprises a grab rod and a mounting rod, the grab rod and the mounting rod are connected into a whole, and an included angle between the grab rod and the mounting rod is an obtuse angle;

The L-shaped brush rod is provided with a connecting end and a brush head end, the connecting end of the L-shaped brush rod is connected with the end of the mounting rod, and one end face of the brush head end of the brush rod is provided with brush hair.

Optionally, a plurality of first limiting protrusion groups are arranged on the surface of the mounting rod at intervals;

The connecting end of the L-shaped brush rod is provided with concave holes, and a plurality of second limiting protrusions are arranged in the concave holes at intervals;

The end part of the mounting rod is inserted into the concave hole of the L-shaped brush rod, the first limiting protrusion group and the corresponding second limiting protrusion are mutually clamped to realize the fastening connection of the mounting rod and the brush rod, and the clamping relation between the first limiting protrusion group and the second limiting protrusion is changed, so that the L-shaped brush rod is adjusted relative to the expansion and contraction amount of the end part of the mounting rod, and the length of the toothbrush with the rear tooth end face is changed.

Optionally, the link of L type brush-holder stud is the head rod, the brush head end of L type brush-holder stud is the second connecting rod, the second connecting rod through bend connecting portion with the head rod is connected and is constituted L type brush-holder stud, bend connecting portion can atress produce elastic deformation and change the angle of bending of L type brush-holder stud.

Optionally, the bending connection portion includes:

The two ends of the L-shaped metal sheet are respectively connected with the first connecting rod and the second connecting rod;

and the plastic layer is used for coating the L-shaped metal sheet.

Optionally, the handle is used as a holding part, and the width of the holding part gradually decreases towards the end part of the mounting rod, so that the width of the L-shaped brush rod connected with the mounting rod is smaller than that of the holding part.

Optionally, the hand-held part is provided with an anti-skid friction section, and the surface of the anti-skid friction section is provided with anti-skid protrusions which are arranged in a uniform manner.

Optionally, an extension line of the grip rod faces the brush hair.

Optionally, the length, width and height of the bristle area are respectively 10-18mm, 3-7mm and 3-7mm.

Optionally, the length of the bristles in the middle is greater than the length of the bristles at the edges.

Optionally, an included angle between the holding rod and the mounting rod is 135-155 degrees.

The technical scheme has the advantages of simple structure, low use cost and high cleaning efficiency, and can effectively clean the end face of the rear tooth and effectively protect the tooth.

Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain, without limitation, the embodiments of the utility model. In the drawings:

FIG. 1 is a front elevational view of a rear facing toothbrush provided by the present utility model;

FIG. 2 is a top view of a rear facing toothbrush provided by the present utility model;

FIG. 3 is a schematic view of a connection structure between a first mounting bar and an L-shaped brush bar according to the present utility model;

FIG. 4 is a schematic view of a connection structure between a second mounting bar and an L-shaped brush bar according to the present utility model;

Fig. 5 is a schematic diagram of a connection structure of a bending connection part provided by the utility model;

fig. 6 is a schematic view of a toothbrush according to the present utility model using a rear face.

Description of the reference numerals

1-Grab handle, 2-L-brush rod, 3-brush hair;

the connecting part is 4-bent, the holding rod is 11-and the mounting rod is 12-;

21-concave hole, 22-first connecting rod, 23-second connecting rod;

41-L-shaped metal sheet, 42-plastic layer, 111-anti-slip friction section;

121-a first limiting protrusion group and 211-a second limiting protrusion.

Detailed Description

The following describes the detailed implementation of the embodiments of the present utility model with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the embodiments of the present utility model, unless otherwise indicated, terms such as "upper, lower, left, and right" and "upper, lower, left, and right" are used generally referring to directions or positional relationships based on those shown in the drawings, or those conventionally used in the use of the inventive products.

The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

The terms "parallel", "perpendicular", and the like do not denote that the components are required to be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel than "perpendicular" and does not mean that the structures must be perfectly parallel, but may be slightly tilted.

The terms "horizontal," "vertical," "overhang," and the like do not denote that the component is required to be absolutely horizontal, vertical, or overhang, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "substantially," "essentially," and the like, are intended to be limited to the precise form disclosed herein and are not necessarily intended to be limiting. For example, "substantially equal" does not mean absolute equal, but it is difficult to achieve absolute equal during actual production and operation, and there is generally a certain deviation. Thus, in addition to absolute equality, "approximately equal to" includes the above-described case where there is a certain deviation. In other cases, the terms "substantially", "essentially" and the like are used in a similar manner to those described above unless otherwise indicated.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, or may be directly connected, or may be indirectly connected through an intermediate medium, or may be in communication with the inside of two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Fig. 1 is a front view of a toothbrush with a rear tooth end face, fig. 2 is a top view of a toothbrush with a rear tooth end face, fig. 3 is a schematic view of a connection structure between a first mounting rod and an L-shaped brush rod, fig. 4 is a schematic view of a connection structure between a second mounting rod and an L-shaped brush rod, fig. 5 is a schematic view of a connection structure of a bending connection part, and fig. 6 is a schematic view of a toothbrush with a rear tooth end face.

As shown in fig. 1-2, the present embodiment provides a rear face toothbrush comprising:

The grab handle 1, the grab handle 1 includes the grip lever 11 and installs the pole 12, the grip lever 11 is connected with the installation pole 12 each other and is an organic whole, and the included angle between the grip lever 11 and the installation pole 12 is the obtuse angle;

The L-shaped brush rod 2 is provided with a connecting end and a brush head end, the connecting end of the L-shaped brush rod 2 is connected with the end of the mounting rod 12, and one end face of the brush head end of the brush rod 2 is provided with brush hair 3.

Specifically, in the embodiment, in order to realize effective cleaning of the rear tooth end face, a rear tooth end face toothbrush is arranged, and in order to provide fitting effect and convenience in use, an oral cavity structure and tooth positions are combined, and when a hand-held toothbrush enters oral cavity for brushing teeth, a brush holder is not in a completely parallel state relative to the oral cavity, and the whole structure of the toothbrush is arranged to comprise a grab handle 1 and an L-shaped brush rod 2, wherein the grab handle 1 comprises a grab handle 11 and a mounting rod 12, the mounting rod 12 is obliquely arranged at the end part of the grab handle 11, the grab handle 1 and the mounting rod 12 have a certain inclination angle, an obtuse angle is formed, bristles 3 are arranged at the brush head end of the L-shaped brush rod 2, and the connecting end of the L-shaped brush rod 2 is connected to the mounting rod 12, so that convenience in use can be improved, and effective cleaning of the rear tooth end face can be realized. In the use process, as shown in fig. 6, after toothpaste is squeezed on the bristles 3, the holding rod 11 is held by hands, one end of the bristles 3 is sent into the oral cavity, and the bristles 3 are attached to the end faces of the rear teeth and move back and forth, so that the end faces of the rear teeth are cleaned.

Wherein, all edges of the L-shaped brush rod 2 are smoothly treated, and the comfort level of the brush head in the oral cavity and the hand holding is improved. The holding rod 11 and the mounting rod 12 may be of an integrally formed structure to enhance the strength of the mechanism, and in addition, the width and thickness of the first end of the mounting rod 12 connected with the holding rod 11 are the same as those of the holding rod 11, the end connected with the L-shaped brush holder 2 is a second end, and the width and thickness of the mounting rod 12 from the first end to the second end are sequentially reduced.

Further, as shown in fig. 3-4, a plurality of first limiting protrusion groups 121 are arranged on the surface of the mounting rod 12 at intervals;

A concave hole 21 is formed in one end, connected with the mounting rod 12, of the L-shaped brush rod 2, and a plurality of second limiting protrusions 211 are arranged in the concave hole 21 at intervals;

The end part of the mounting rod 12 is inserted into the concave hole 21 of the L-shaped brush rod 2, the first limiting protrusion group 121 and the corresponding second limiting protrusion 211 are mutually clamped to realize the fastening connection of the mounting rod 12 and the brush rod 2, and the clamping relation between the first limiting protrusion group 121 and the second limiting protrusion 211 is changed, so that the expansion and contraction amount of the L-shaped brush rod 2 relative to the end part of the mounting rod 12 is adjusted, and the length of the toothbrush with the rear tooth end face is changed.

Specifically, in this embodiment, because there is certain difference in the size of the oral cavity and the depth of teeth in the oral cavity of children and adults, therefore, if the toothbrush with the rear tooth end face is set to a structure with fixed length, the convenience of using any one of them can be reduced, thereby reduce cleaning effect, therefore, adopt detachable mode to set up L type brush-holder stud 2 on installation pole 12, in order to realize the regulation of position, can fix L type brush-holder stud 2 on installation pole 12 again, the interval is provided with a plurality of first spacing protruding groups 121 on installation pole 12, the one end that L type brush-holder stud 2 and installation pole 12 are connected is provided with shrinkage pool 21, and the interval is provided with a plurality of second spacing protruding 211 in shrinkage pool 21, insert the tip of installation pole 12 behind the shrinkage pool 21 of L type brush-holder stud 2, corresponding first spacing protruding groups 121 and corresponding second spacing protruding 211 each other, just realize the block fixation of L type brush-holder stud 2 and installation pole 12, in addition, when need carry out length adjustment, through outwards pulling out L type brush-holder stud 2, the new spacing protruding end face of adjustment 2 and the corresponding to the second protruding end face of installation pole 12 change at this moment, change the corresponding to the second end face of the second protruding end face of the toothbrush of the end of the L type brush-holder stud 2. The first limiting protrusion set 121 includes two limiting protrusions disposed at intervals, and the corresponding second limiting protrusion 211 is clamped between the two limiting protrusions of the first limiting protrusion set 121.

More specifically, in order to avoid the occurrence of rotational displacement between the mounting bar 12 and the L-shaped brush bar 2 during use, rattling occurs, the mounting bar 12 and the L-shaped brush bar 2 are provided in a structure other than a circular structure, i.e., in a rectangular, oval or like structure in cross section. Each of the first limiting protrusion set 121 and the second limiting protrusion 211 may adopt an intermittent protruding strip, so as to ensure the stability of contact.

Further, as shown in fig. 5, the connection end of the L-shaped brush rod 2 is a first connection rod 22, the brush head end of the L-shaped brush rod 2 is a second connection rod 23, the second connection rod 23 is connected with the first connection rod 22 through a bending connection part 4 to form the L-shaped brush rod 2, and the bending connection part 4 can be stressed to generate elastic deformation to change the bending angle of the L-shaped brush rod 2.

Specifically, in this embodiment, when the rear tooth end face toothbrush is used to clean the rear tooth end face, because the L-shaped brush rod 2 can bear a certain extrusion force, the turning part of the L-shaped brush rod 2 is the weakest part of the whole, and there is a risk of breaking in the use process, and damage can occur to the oral cavity, therefore, a bending connecting part 4 is buried in the turning part, the bending strength is increased, the elastic deformation of the L-shaped brush rod 2 is ensured, and the breakage during use is effectively avoided.

More specifically, in order to reduce the concentration of stress, the L-shaped brush rod 2 is in a circular arc transition, that is, in a circular chamfer structure.

Further, as shown in fig. 5, the bending connection part 4 includes:

an L-shaped metal piece 41, wherein two ends of the L-shaped metal piece 41 are respectively connected with the first connecting rod 22 and the second connecting rod 23;

a plastic layer 42 provided to cover the L-shaped metal piece 41.

Specifically, in this embodiment, the bending connection portion 4 is configured to include an L-shaped metal sheet 41, where the L-shaped metal sheet 41 has a structural strength greater than that of a plastic structure, has a certain elastic deformation amount, and is not easy to bend, and in addition, the plastic layer 42 is covered on the outer layer of the L-shaped metal sheet 41, so as to protect the L-shaped metal sheet 41, and increase the service life thereof. Wherein, L-shaped metal sheet can also be replaced with arc-shaped metal sheet.

Further, the grip 1 serves as a holding portion, and the width thereof is gradually reduced toward the end of the mounting bar 12 so that the width of the L-shaped brush bar 2 connected to the mounting bar 12 is smaller than the holding portion.

Specifically, since the rear tooth end face is located at a specific position, and the toothbrush part entering the oral cavity may affect the normal brushing, in this embodiment, the overall shape structure of the L-shaped brush bar 2 and the bristles 3 is slightly smaller than that of a conventional toothbrush, and meanwhile, in order to facilitate the grasping during use, the width of the L-shaped brush bar 2 is smaller than that of the grip 1. Preferably, the length dimension is about two-thirds of the length dimension of a conventional toothbrush and the width dimension is about half of the width dimension of a conventional toothbrush, so that the brush head can substantially cover the tooth surface when pulled for brushing.

Further, as shown in fig. 2, the grip part has a slip resistant friction section 111, and the slip resistant friction section 111 is provided with slip resistant protrusions arranged in a uniform manner on the surface.

Specifically, in the present embodiment, the grip 11 is provided with the anti-slip friction section 111, so that the grip can be held more stably when in use, and the anti-slip friction section 111 is usually provided at the position of the thumb when in gripping.

Further, the bristles 3 are plastic soft bristles.

In particular, in the present embodiment, the bristles 3 are plastic soft bristles, which can ensure both cleaning effect and protection of gums.

Further, an extension line of the grip lever 11 is directed toward the brush 3.

In particular, the definition of the overall structure is achieved by defining the extension of the grip lever 11 towards said bristles 3.

Further, the length, width and height of the bristle 3 area are respectively 10-18mm, 3-7mm and 3-7mm.

Specifically, the height of the second molar or the third molar above the gingival area is generally about 2-4 mm, the height of the lower tooth is about 3-6 mm, the width of the end face is about 7-10 mm, the bristle surface size of the toothbrush head is preferably determined to be 15 x 5mm, the length size of the toothbrush head is about two thirds of that of a traditional toothbrush, the width size of the toothbrush head is about half of that of the traditional toothbrush, and the toothbrush head can cover the tooth surface basically when being pulled for brushing. The bristle height is compressed to within half of the height of a conventional toothbrush bristle, preferably 5mm, and the bristle mounting panel thickness is preferably 2mm, which are added to 7mm, and the normal brushing may be affected due to the limited rear space position of the rear tooth end surface, such as the excessively large size.

Further, the length of the bristles 3 positioned at the center is longer than the length of the bristles 3 positioned at the edges.

Specifically, in this embodiment, the overall shape of the brush 3 is in a form of having a middle portion higher and lower on both sides, because the brush handle is not completely parallel to the oral cavity when the hand-held toothbrush enters the oral cavity for brushing, and an angle is formed between the brush handle and the oral cavity, so as to eliminate the influence of the angle, and ensure the effective fitting of the brush surface and the toothbrush surface during brushing. The bristles are soft bristles used in a traditional toothbrush, the tip size of the bristles is controlled to be 0.01-0.02 mm, and the bristles are longitudinally arranged in two groups or three groups along the brush head.

Further, the included angle between the mounting rod 12 and the holding rod 11 is 135-155 degrees.

Specifically, when the hand-held toothbrush enters into the oral cavity for brushing teeth, the grab handle 1 is not in a completely parallel state relative to the oral cavity, a certain included angle is formed, in order to eliminate the influence caused by the included angle, the mounting rod 12 is obliquely arranged on the grab rod 11, and the included angle between the mounting rod 12 and the grab rod 11 is 135-155 degrees, so that the effective fit between the brushing surface and the tooth surface during brushing teeth is ensured.

Examples

In one embodiment, according to the use scene and requirements of the toothbrush with the rear tooth end face, the requirements of convenient gripping, flexible use and good cleaning effect are required to be met, the total length of the grab handle 1 is controlled within 100mm, the width is 9mm, the thickness is 6mm, and the length of 30mm close to the front end of the brush head is transited to the width of 5mm, and the thickness is 3mm. The brush handle is bent and stretched for 30mm at the position 30mm away from the brush head, and the included angle between the mounting rod 12 and the holding rod 11 is 150 degrees, so that the brush handle cannot collide with the mouth corner when the end face brush is used according to the structural characteristics of an oral cavity. The end of the grab handle 1 (the position where the thumb holds after holding) is provided with an anti-skid friction surface for holding more firmly when in use. The overall dimension of the bristles is determined to be 15×5mm, the bristle height is compressed to be within half of the height of the conventional toothbrush bristles, the initial dimension is 5mm, the thickness of the bristle mounting panel is tentatively 2mm, and the sum of the two is 7mm.

The foregoing details of the optional implementation of the embodiment of the present utility model have been described in conjunction with the accompanying drawings, but the embodiment of the present utility model is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present utility model within the scope of the technical concept of the embodiment of the present utility model, where all the simple modifications belong to the protection scope of the embodiment of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of embodiments of the present utility model are not described in detail.

In addition, any combination of various embodiments of the present utility model may be performed, so long as the concept of the embodiments of the present utility model is not violated, and the disclosure of the embodiments of the present utility model should also be considered.

Claims

1. A toothbrush for the end surface of posterior teeth, characterized in that the toothbrush for the end surface of posterior teeth comprises:

A handle (1), the handle (1) comprising a grip rod (11) and a mounting rod (12), the grip rod (11) and the mounting rod (12) being connected to each other as a whole, and an angle between the grip rod (11) and the mounting rod (12) being an obtuse angle;

An L-shaped brush rod (2) having a connecting end and a brush head end, wherein the connecting end of the L-shaped brush rod (2) is connected to the end of the mounting rod (12), and bristles (3) are arranged on one end surface of the brush head end of the brush rod (2);

A plurality of first position-limiting protrusion groups (121) are arranged at intervals on the surface of the mounting rod (12);

The connecting end of the L-shaped brush rod (2) is provided with a concave hole (21), and a plurality of second limiting protrusions (211) are arranged at intervals in the concave hole (21);

The end of the mounting rod (12) is inserted into the concave hole (21) of the L-shaped brush rod (2), and the first limiting protrusion group (121) and the corresponding second limiting protrusion (211) are mutually engaged to realize the fastening connection between the mounting rod (12) and the brush rod (2), and the engagement relationship between the first limiting protrusion group (121) and the second limiting protrusion (211) is changed, thereby adjusting the extension and contraction amount of the L-shaped brush rod (2) relative to the end of the mounting rod (12), thereby changing the length of the posterior tooth end surface toothbrush.

2. The posterior tooth end surface toothbrush according to claim 1 is characterized in that the connecting end of the L-shaped brush rod (2) is a first connecting rod (22), the brush head end of the L-shaped brush rod (2) is a second connecting rod (23), and the second connecting rod (23) is connected to the first connecting rod (22) through a bending connection part (4) to form the L-shaped brush rod (2), and the bending connection part (4) can produce elastic deformation under force to change the bending angle of the L-shaped brush rod (2).

3. The posterior tooth end surface toothbrush according to claim 2, characterized in that the bent connecting portion (4) comprises:

An L-shaped metal sheet (41), wherein two ends of the L-shaped metal sheet (41) are respectively connected to the first connecting rod (22) and the second connecting rod (23);

The plastic layer (42) is arranged to cover the L-shaped metal sheet (41).

4. The back teeth end surface toothbrush according to claim 1 is characterized in that the handle (1) serves as a hand-held portion, and its width gradually decreases toward the end of the mounting rod (12), so that the width of the L-shaped brush rod (2) connected to the mounting rod (12) is smaller than the hand-held portion.

5. The posterior tooth end surface toothbrush according to claim 4, characterized in that the hand-held portion has an anti-slip friction section (111), and the surface of the anti-slip friction section (111) is provided with anti-slip protrusions arranged in a uniform manner.

6. The toothbrush for the posterior teeth end surfaces according to claim 1, characterized in that an extension line of the gripping rod (11) faces the bristles (3).

7. The toothbrush for the posterior teeth end surfaces according to claim 1, characterized in that the length, width and height of the bristle (3) area are respectively: 10-18 mm, 3-7 mm, and 3-7 mm.

8. The toothbrush for the posterior teeth end surfaces according to claim 1, characterized in that the length of the bristles (3) located in the middle is greater than the length of the bristles (3) located at the edge.

9. The posterior tooth end surface toothbrush according to claim 1, characterized in that the angle between the grip rod (11) and the mounting rod (12) is 135-155 degrees.