阅读说明：本技术 一种互联网教育用具有可升降替换结构的展示板 (Internet education is with show board that has liftable alternative structure ) 是由 赵君 张敏敏 张婕 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种互联网教育用具有可升降替换结构的展示板,涉及教育器材技术领域,解决了现有的展示板在使用中当需要更换展品是需要将展品前的防护装置拆下然后,然后将展品松开,然后更换展品后在将展品前的防护装置安装上,使用中操作麻烦,影响教学效果的问题,包括安装底座；升降组件,升降组件设置在安装底座的上部,升降组件的顶部连接有一组展示升降板；展示翻动板,展示翻动板主体为透明板状结构,展示翻动板铰链连接在展示升降板的前端面。本发明可以满足不同展示高度需要,方便对展品进行更换,使用简单,操作方便,大幅度提高了工作效率,结构简单成本低廉,同时通过压紧组件对展品压紧,实现了对展品的良好固定。(The invention discloses a display board with a liftable replacement structure for internet education, which relates to the technical field of education equipment and solves the problems that when an exhibit needs to be replaced in the use of the existing display board, a protection device in front of the exhibit needs to be detached, then the exhibit is loosened, then the protection device in front of the exhibit is installed after the exhibit is replaced, the operation is troublesome in the use and the teaching effect is influenced; the lifting assembly is arranged on the upper part of the mounting base, and the top of the lifting assembly is connected with a group of display lifting plates; the display turning plate is characterized in that the display turning plate main body is of a transparent plate-shaped structure, and the display turning plate is hinged to the front end face of the display lifting plate. The invention can meet the requirements of different display heights, is convenient to replace the exhibit, has simple use and convenient operation, greatly improves the working efficiency, has simple structure and low cost, and realizes good fixation of the exhibit by pressing the exhibit through the pressing component.)

1. The utility model provides an internet education is with show board that has liftable alternative structure which characterized in that: comprises a mounting base (1);

the lifting assembly is arranged on the upper part of the mounting base (1), and the top of the lifting assembly is connected with a group of display lifting plates (4);

the display turning plate (5) is of a transparent plate-shaped structure, and the display turning plate (5) is hinged to the front end face of the display lifting plate (4);

the overturning transmission mechanism is arranged at the front part of the display lifting plate (4) and drives the display overturning plate (5) to rotate;

the overturning linkage mechanisms are arranged inside the left side and the right side of the display lifting plate (4) and drive the overturning transmission mechanisms to act;

the pressing component is arranged on the front end face of the display lifting plate (4).

2. The display board with the liftable alternative structure for internet education as claimed in claim 1, wherein: the lifting component also comprises:

the lifting connecting rods (3) are arranged in two groups, the two groups of lifting connecting rods (3) are connected in a crossed hinge mode to form a scissor fork structure, the lower portion of the right side of each lifting connecting rod (3) is connected with the installation base (1) in a hinge mode, the upper portion of the right side of each lifting connecting rod (3) is connected with the display lifting plate (4) in a hinge mode, and the upper portion of the left side of each lifting connecting rod (3) is connected with the display lifting plate (4) in a sliding mode through the sliding block connected with the hinge.

3. The display board with the liftable alternative structure for internet education as claimed in claim 2, wherein: the lifting component also comprises:

the lifting driving screw rod (201), the lifting driving screw rod (201) is coaxially and fixedly connected to the rotating shaft of the driving piece (2);

the lifting driving device comprises a lifting driving sliding block (202), the lifting driving sliding block (202) is in threaded connection with a lifting driving lead screw (201), the lifting driving sliding block (202) is in sliding connection with an installation base (1), the top of the lifting driving sliding block (202) is in hinged connection with a lifting connecting rod (3) on the lower left side, and the lifting driving sliding block (202) and the lifting driving lead screw (201) jointly form a lead screw nut transmission pair.

4. The display board with the liftable alternative structure for internet education as claimed in claim 1, wherein: the turnover transmission mechanism further comprises:

the swinging sliding blocks (8), the swinging sliding blocks (8) are connected to the left side and the right side of the display lifting plate (4) in a sliding manner;

the display lifting plate is characterized by comprising a swinging connecting rod (801), the swinging connecting rod (801) is hinged to the front end face of a swinging sliding block (8), the other end of the swinging connecting rod (801) is hinged to the display overturning plate (5), and a crank sliding block transmission mechanism is formed among the swinging sliding block (8), the swinging connecting rod (801), the display overturning plate (5) and the display lifting plate (4).

5. The display board with the liftable alternative structure for internet education as claimed in claim 1, wherein: the turnover linkage mechanism further comprises:

the overturning driving rack (101), the overturning driving rack (101) is fixedly connected to the left side and the right side of the top of the mounting base (1);

the overturning middle transmission shaft (6) is rotatably connected to the left side and the right side of the display lifting plate (4);

the overturning driven gear (601) is coaxially and fixedly connected to the left side and the right side of the overturning middle transmission shaft (6), and the overturning driving rack (101) is meshed with the overturning driven gear (601) to jointly form a gear rack transmission mechanism.

6. The display board with the liftable alternative structure for internet education as claimed in claim 5, wherein: the turnover linkage mechanism further comprises:

the overturning driving bevel gear (602), the overturning driving bevel gear (602) is coaxially and fixedly connected with the inner side of the overturning intermediate transmission shaft (6);

the overturning driving screw rod (7), the overturning driving screw rod (7) is actively connected to the inner parts of the left side and the right side of the display lifting plate (4);

the overturning driven bevel gear (701) is coaxially and fixedly connected to the bottom of the overturning driving screw rod (7), and the overturning driving bevel gear (602) is meshed with the overturning driven bevel gear (701) to form a bevel gear transmission mechanism together.

7. The display board with the liftable alternative structure for internet education as claimed in claim 6, wherein: the turning driving screw rod (7) is in threaded transmission connection with the swinging sliding block (8) to form a screw rod nut transmission pair.

8. The display board with the liftable alternative structure for internet education as claimed in claim 1, wherein: the display turning plate (5) further comprises:

the exhibition article clamping groove (501) is of a rectangular groove structure, and the exhibition article clamping grooves (501) are symmetrically formed in the upper portions of the left side and the right side of the exhibition turning plate (5).

9. The display board with the liftable alternative structure for internet education as claimed in claim 1, wherein: the compressing assembly further comprises:

the exhibit pressing plate (9), the exhibit pressing plate (9) is of a plate-shaped structure;

the exhibition shelf is characterized in that four groups of pressing plate guide columns (901) are arranged, the four groups of pressing plate guide columns (901) are respectively and fixedly connected to four corners of the rear end face of the exhibition shelf pressing plate (9), and the exhibition shelf pressing plate (9) is in sliding connection with the exhibition lifting plate (4) through the pressing plate guide columns (901);

the display lifting plate is characterized in that four groups of pressing springs (902) are arranged, the four groups of pressing springs (902) are respectively sleeved on the four groups of pressing plate guide columns (901), and the display pressing plate (9) is elastically connected with the display lifting plate (4) through the pressing springs (902).

Technical Field

The invention relates to the technical field of education equipment, in particular to a display board with a liftable replacement structure for internet education.

Background

With the development of science and technology, the internet gradually deepens into all aspects of work and life, and internet education has also received the wide application, often will use individual show board to assist the explanation in the network education process, for example application number: the invention discloses a word demonstrating board for children English teaching, and belongs to the technical field of teaching aids. This vocabulary show board includes: the utility model provides a magnetic card, including first plate body, one side of first plate body articulates there is the second plate body, be equipped with horizontal spout on the second plate body, jettison device and horizontal spout sliding connection, be equipped with a plurality of vertical dovetails along the equidistance of horizontal direction on the second plate body, a plurality of vertical dovetails are located horizontal spout's top, the top of a plurality of vertical dovetails is equipped with the recess, the magnetic plate body is established in the recess, the bottom surface and the magnetic plate body of vertical dovetail are in the coplanar, the bottom of a plurality of letter cards all is equipped with first slider, the surface of first slider is equipped with the magnet piece, first slider and vertical dovetail sliding connection. The vocabulary display board provided by the invention adopts English vocabulary learned in a game mode, so that interestingness is integrated into teaching, and children are enjoyed to be put into games.

Based on the above, when the existing display board needs to replace the exhibit, the protection device in front of the exhibit needs to be detached, then the exhibit is loosened, and then the protection device in front of the exhibit is installed after the exhibit is replaced, so that the operation is troublesome in use, and the teaching effect is influenced; therefore, the existing requirements are not met, and the display board with the liftable alternative structure for the internet education is provided for the internet education.

Disclosure of Invention

The invention aims to provide a display board with a liftable replacement structure for internet education, and aims to solve the problems that when an exhibit needs to be replaced in use, a protection device in front of the exhibit needs to be detached, then the exhibit is loosened, then the protection device in front of the exhibit needs to be installed after the exhibit is replaced, operation is troublesome in use, and teaching effect is affected.

In order to achieve the purpose, the invention provides the following technical scheme: a display board with a liftable replacement structure for internet education comprises a mounting base;

the lifting assembly is arranged on the upper part of the mounting base, and the top of the lifting assembly is connected with a group of display lifting plates;

the display turning plate is characterized in that the display turning plate main body is of a transparent plate-shaped structure, and the display turning plate is hinged to the front end face of the display lifting plate;

the overturning transmission mechanism is arranged at the front part of the display lifting plate and drives the display overturning plate to rotate;

the turnover linkage mechanisms are arranged inside the left side and the right side of the display lifting plate and drive the turnover transmission mechanisms to act;

the pressing assembly is arranged on the front end face of the display lifting plate.

Preferably, the lifting assembly further comprises:

the lifting connecting rods are arranged in two groups, the two groups of lifting connecting rods are connected through a hinge in a crossed mode to form a scissor fork structure, the lower portion of the right side of each lifting connecting rod is connected with the mounting base through a hinge, the upper portion of the right side of each lifting connecting rod is connected with the display lifting plate through a hinge, and the upper portion of the left side of each lifting connecting rod is connected with the display lifting plate in a sliding mode through a sliding block connected with the hinge.

Preferably, the lifting assembly further comprises:

the lifting driving screw rod is coaxially and fixedly connected to the rotating shaft of the driving piece;

the lifting driving sliding block is in threaded connection with the lifting driving screw rod, the lifting driving sliding block is in sliding connection with the installation base, the top of the lifting driving sliding block is hinged with a lifting connecting rod on the left lower side, and the lifting driving sliding block and the lifting driving screw rod jointly form a screw rod nut transmission pair.

Preferably, the turnover transmission mechanism further comprises:

the swinging sliding blocks are connected to the left side and the right side of the display lifting plate in a sliding manner;

the swinging connecting rod is hinged to the front end face of the swinging sliding block, the other end of the swinging connecting rod is hinged to the display turning plate, and the swinging sliding block, the swinging connecting rod, the display turning plate and the display lifting plate form a crank sliding block transmission mechanism together.

Preferably, the turnover linkage mechanism further comprises:

the overturning driving rack is fixedly connected to the left side and the right side of the top of the mounting base;

the overturning middle transmission shaft is rotatably connected to the left side and the right side of the display lifting plate;

the overturning driven gear is coaxially and fixedly connected to the left side and the right side of the overturning middle transmission shaft, and the overturning driving rack is meshed with the overturning driven gear to jointly form a gear rack transmission mechanism.

Preferably, the turnover linkage mechanism further comprises:

the overturning driving bevel gear is coaxially and fixedly connected to the inner side of the overturning intermediate transmission shaft;

the overturning driving screw rods are actively connected to the insides of the left side and the right side of the display lifting plate;

the overturning driven bevel gear is coaxially and fixedly connected to the bottom of the overturning driving screw rod, and the overturning driving bevel gear is meshed with the overturning driven bevel gear to form a bevel gear transmission mechanism.

Preferably, the overturning driving screw rod and the swinging sliding block are in threaded transmission connection to form a screw rod nut transmission pair.

Preferably, the display turning plate further comprises:

the exhibit clamping grooves are of rectangular groove structures and are symmetrically arranged on the upper portions of the left side and the right side of the exhibiting turning plate.

Preferably, the compressing assembly further comprises:

the exhibit pressing plate is of a plate-shaped structure;

the four groups of pressure plate guide posts are respectively fixedly connected to four corners of the rear end surface of the exhibit pressure plate, and the exhibit pressure plate is in sliding connection with the display lifting plate through the pressure plate guide posts;

the pressing springs are provided with four groups, the four groups of pressing springs are respectively sleeved on the four groups of pressing plate guide posts, and the exhibit pressing plates are elastically connected with the exhibiting lifting plate through the pressing springs.

Compared with the prior art, the invention has the beneficial effects that:

when the lifting device is used, the driving piece drives the lifting driving slide block to slide left and right through the screw nut transmission pair formed by the lifting driving slide block and the lifting driving screw rod, the lifting driving slide block drives the scissor fork structure formed by connecting two groups of lifting connecting rods through the crossed hinges to deform, and the lifting of the lifting board is realized through the deformation of the scissor fork structure, so that the lifting device is convenient to display.

When the display lifting plate descends to the bottom, the overturning driving rack is meshed with the overturning driven gear, the overturning driving rack drives the overturning intermediate transmission shaft to rotate through a gear rack transmission mechanism formed by the meshing of the overturning driving rack and the overturning driven gear, the overturning intermediate transmission shaft drives the overturning driving screw to rotate through a bevel gear transmission mechanism formed by the meshing of the overturning driving bevel gear and the overturning driven bevel gear, the overturning driving screw drives the swinging slider to slide up and down through a screw nut transmission pair formed by the threaded transmission connection of the overturning driving screw and the swinging slider, the swinging slider drives the display overturning plate to swing through a crank slider transmission mechanism formed by the cooperation of the swinging slider, the swinging connecting rod, the display overturning plate and the display lifting plate, the display is inserted into a display clamping groove during unfolding, the fixation of the display is realized, and the good positioning of the display is realized, the convenience is replaced the showpiece, when standing up shows the showpiece.

When the display turning plate stands, the display turning plate pushes the exhibit pressing plate backwards, and the exhibit pressing plate is pushed forwards through the elastic deformation of the pressing spring to press the exhibits, so that the exhibits are effectively prevented from sliding, and a good display effect is ensured.

The turnover mechanism realizes the adjustment of the display height of the exhibits, can meet the requirements of different display heights, realizes the turnover of the display turnover plate through the turnover linkage mechanism and the turnover transmission mechanism, is convenient to replace the exhibits, is simple to use and convenient to operate, greatly improves the working efficiency, has a simple structure and low cost, and realizes the good fixation of the exhibits by pressing the pressing component.

Drawings

FIG. 1 is a schematic side view of the present invention;

FIG. 2 is a schematic side view of the lift assembly of the present invention;

FIG. 3 is a schematic side view of the transmission shaft of the display flipping board of the present invention;

FIG. 4 is a schematic side view of the turnover actuator according to the present invention;

FIG. 5 is a schematic side view of the transmission shaft of the inverted intermediate transmission shaft according to the present invention;

FIG. 6 is a schematic side view of the oscillating slider driving shaft of the present invention;

FIG. 7 is a schematic view of the shaft side structure of the exhibit press plate of the present invention;

in the figure: 1. installing a base; 101. turning over the driving rack; 2. a drive member; 201. lifting the driving screw; 202. a lifting drive slider; 3. a lifting connecting rod; 4. displaying the lifting plate; 5. displaying the turning plate; 501. an exhibit clamping groove; 6. turning over the middle transmission shaft; 601. turning over the driven gear; 602. turning over the driving bevel gear; 7. turning over a driving screw; 701. turning over the driven bevel gear; 8. a swing slider; 801. a swing link; 9. a exhibit pressing plate; 901. a platen guide post; 902. compressing the spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

Referring to fig. 1 to 7, an embodiment of the present invention includes: a display board with a liftable replacement structure for internet education comprises a mounting base 1;

the lifting assembly is arranged on the upper part of the mounting base 1, and the top of the lifting assembly is connected with a group of display lifting plates 4; as shown in fig. 2, the lifting assembly further comprises: the lifting connecting rods 3 are arranged in two groups, the two groups of lifting connecting rods 3 are connected through a cross hinge to form a scissor structure, the lower portion of the right side of each lifting connecting rod 3 is connected with the mounting base 1 through a hinge, the upper portion of the right side of each lifting connecting rod 3 is connected with the display lifting plate 4 through a hinge, and the upper portion of the left side of each lifting connecting rod 3 is connected with the display lifting plate 4 through a hinged sliding block in a sliding mode; the lifting driving screw 201, the lifting driving screw 201 is coaxially and fixedly connected to the rotating shaft of the driving part 2; the lifting driving slider 202 is in threaded connection with a lifting driving screw 201, the lifting driving slider 202 is in sliding connection with the mounting base 1, the top of the lifting driving slider 202 is in hinged connection with a lifting connecting rod 3 at the lower left, the lifting driving slider 202 and the lifting driving screw 201 jointly form a screw nut transmission pair, and the driving piece 2 has the advantages that the lifting driving slider 202 and the lifting driving screw 201 jointly form the screw nut transmission pair to drive the lifting driving slider 202 to slide left and right, the lifting driving slider 202 drives two groups of lifting connecting rods 3 to be in crossed hinged connection to jointly form a scissor structure to deform, lifting of the display lifting plate 4 is achieved through deformation of the scissor structure, and display is convenient;

the display turning plate 5 is characterized in that the main body of the display turning plate 5 is of a transparent plate-shaped structure, and the display turning plate 5 is hinged to the front end face of the display lifting plate 4;

the overturning transmission mechanism is arranged at the front part of the display lifting plate 4 and drives the display overturning plate 5 to rotate; as shown in fig. 4, the turnover transmission mechanism further includes: the swinging slide block 8, the swinging slide block 8 is connected with the left side and the right side of the display lifting plate 4 in a sliding way; the exhibition device comprises a swinging connecting rod 801, wherein the swinging connecting rod 801 is hinged to the front end face of a swinging sliding block 8, the other end of the swinging connecting rod 801 is hinged to an exhibition turning plate 5, the swinging sliding block 8, the swinging connecting rod 801, the exhibition turning plate 5 and the exhibition lifting plate 4 jointly form a crank sliding block transmission mechanism, and the swinging sliding block 8 slides up and down, the swinging sliding block 8 drives the exhibition turning plate 5 to swing through the crank sliding block transmission mechanism jointly formed by the swinging sliding block 8, the swinging connecting rod 801, the exhibition turning plate 5 and the exhibition lifting plate 4, so that an exhibit can be conveniently replaced during unfolding, and the exhibit can be conveniently displayed during standing;

the turnover linkage mechanisms are arranged inside the left side and the right side of the display lifting plate 4 and drive the turnover transmission mechanisms to act; as shown in fig. 3, the turnover linkage mechanism further comprises: the overturning driving rack 101 is fixedly connected to the left side and the right side of the top of the mounting base 1; the turning middle transmission shaft 6 is connected to the left side and the right side of the display lifting plate 4 in a rotating mode; the overturning driven gear 601 is coaxially and fixedly connected to the left side and the right side of the overturning middle transmission shaft 6, the overturning driving rack 101 and the overturning driven gear 601 are meshed to form a gear and rack transmission mechanism together, and the overturning driving rack 101 is meshed with the overturning driven gear 601 when the display lifting plate 4 descends to the bottom, and the overturning driving rack 101 drives the overturning middle transmission shaft 6 to rotate through the gear and rack transmission mechanism formed by the overturning driving rack 101 and the overturning driven gear 601 in a meshed mode; the overturning driving bevel gear 602 is coaxially and fixedly connected to the inner side of the overturning intermediate transmission shaft 6; the overturning driving screw rod 7 is actively connected to the inner parts of the left side and the right side of the display lifting plate 4; the overturning driven bevel gear 701 is coaxially and fixedly connected to the bottom of the overturning driving screw 7, the overturning driving bevel gear 602 is meshed with the overturning driven bevel gear 701 to jointly form a bevel gear transmission mechanism, and the overturning driving bevel gear 7 is driven to rotate by the overturning intermediate transmission shaft 6 through the bevel gear transmission mechanism formed by the overturning driving bevel gear 602 and the overturning driven bevel gear 701 in a meshed mode when the overturning intermediate transmission shaft 6 rotates; the overturning driving screw 7 and the swinging slide block 8 are in threaded transmission connection to form a screw nut transmission pair together, and the overturning driving screw 7 has the effect that when the overturning driving screw 7 rotates, the overturning driving screw 7 drives the swinging slide block 8 to slide up and down through the screw nut transmission pair formed by the overturning driving screw 7 and the swinging slide block 8 in threaded transmission connection together;

the pressing component is arranged on the front end face of the display lifting plate 4; as shown in fig. 7, the pressing assembly further includes: the exhibit pressing plate 9 is of a plate-shaped structure; the exhibition shelf is characterized in that four groups of pressing plate guide columns 901 are arranged, the four groups of pressing plate guide columns 901 are respectively and fixedly connected to four corners of the rear end face of the exhibition shelf 9, and the exhibition shelf 9 is in sliding connection with the exhibition lifting plate 4 through the pressing plate guide columns 901; pressure spring 902, pressure spring 902 are provided with four groups altogether, four groups of pressure spring 902 cup joint respectively at four group's clamp plate guide posts 901, showpiece clamp plate 9 is through pressure spring 902 and 4 elastic connection of show lifter plate, and the effect of bringing is, stands when show tilting plate 5, and show tilting plate 5 promotes showpiece clamp plate 9 backward, and elastic deformation through pressure spring 902 promotes showpiece clamp plate 9 forward and compresses tightly the showpiece, effectively prevents that the showpiece from sliding, guarantees good bandwagon effect.

As shown in fig. 4, the display tilting plate 5 further includes:

the showpiece draw-in groove 501, showpiece draw-in groove 501 are the rectangular channel structure, and the left and right sides upper portion at show turnover board 5 is seted up to showpiece draw-in groove 501 symmetry, and the effect of bringing is, inserts the showpiece in showpiece draw-in groove 501, realizes the fixed to the showpiece, has realized the good location to the showpiece.

The working principle is as follows: when the display lifting plate is used, the driving piece 2 drives the lifting driving slide block 202 to slide left and right through a screw nut transmission pair formed by the lifting driving slide block 202 and the lifting driving screw 201, the lifting driving slide block 202 drives the two groups of lifting connecting rods 3 to be connected through the crossed hinges to form a scissor structure deformation, and the lifting of the display lifting plate 4 is realized through the deformation of the scissor structure, so that the display is convenient; when the display lifting plate 4 descends to the bottom, the overturning driving rack 101 is meshed with the overturning driven gear 601, the overturning driving rack 101 drives the overturning intermediate transmission shaft 6 to rotate through a gear rack transmission mechanism formed by the meshing of the overturning driving rack 101 and the overturning driven gear 601, the overturning intermediate transmission shaft 6 drives the overturning driving screw 7 to rotate through a bevel gear transmission mechanism formed by the meshing of the overturning driving bevel gear 602 and the overturning driven bevel gear 701, the overturning driving screw 7 drives the swinging slider 8 to slide up and down through a screw nut transmission pair formed by the threaded transmission connection of the overturning driving screw 7 and the swinging slider 8, the swinging slider 8 drives the display overturning plate 5 to swing through a crank slider transmission mechanism formed by the swinging slider 8, the swinging connecting rod 801, the display overturning plate 5 and the display lifting plate 4 together, and the display is inserted into the display clamping groove 501 during the unfolding, the fixture of the exhibit is realized, the good positioning of the exhibit is realized, the exhibit is convenient to replace, and the exhibit is displayed when standing up; when the exhibition turning plate 5 stands, the exhibition turning plate 5 pushes the exhibit pressing plate 9 backwards, the exhibit pressing plate 9 is pushed forwards through the elastic deformation of the pressing spring 902 to press the exhibits, the exhibit is effectively prevented from sliding, and a good exhibition effect is ensured.

Example 2

The lifting component also comprises: lifting connecting rod 3, lifting connecting rod 3 are provided with two pairs altogether, and every 3 cross hinged joint of lifting connecting rod constitute jointly and cut the fork structure, and two sets of fork structures of cutting are end to end formed the two-stage type and are cut the fork mechanism, cut the fork structure through the two-stage type that constitutes by lifting connecting rod 3 and have improved the lift scope, have improved the bandwagon effect.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.