阅读说明：本技术 一种用于网络数据机柜角规与侧梁间的免工具快装扣件 (Tool-free quick-mounting fastener used between angle gauge and side beam of network data cabinet ) 是由 袁小兵 于 2019-11-21 设计创作，主要内容包括：本发明涉及一种用于网络数据机柜角规与侧梁间的免工具快装扣件由弹片、手柄及圆柱销共同构成,所述弹片与手柄之间通过圆柱销过盈配合,所述手柄沿圆柱销转动后压缩弹片,使所述弹片形变并实现与侧梁与角规的快速装配。本发明结构简单,使用方便,扣件中弹片的设置可形成多个空间弹性结构使其与角规卡接,手柄采用偏心凸轮结构可使手柄对弹片的弓形结构产生一个逐渐增加的压缩量,从而实现免工具快速人工装拆,本发明中锥刺的设置可刺破与角规接触处的镀锌层和喷涂层,使角规与侧梁基材导通,实现机柜内金属材质零部件的等电位。(The invention relates to a tool-free quick-assembly fastener used between an angle gauge and a side beam of a network data cabinet, which is formed by a spring plate, a handle and a cylindrical pin, wherein the spring plate and the handle are in interference fit through the cylindrical pin, and the handle compresses the spring plate after rotating along the cylindrical pin so as to deform the spring plate and realize quick assembly with the side beam and the angle gauge. The invention has simple structure and convenient use, the elastic sheet in the fastener can form a plurality of space elastic structures to be clamped with the angle gauge, the handle adopts an eccentric cam structure to ensure that the handle can generate a gradually increased compression amount on the arch structure of the elastic sheet, thereby realizing the tool-free rapid manual assembly and disassembly, the arrangement of the taper prick in the invention can puncture the zinc coating and the spraying coating at the contact part with the angle gauge to ensure that the angle gauge is communicated with the side beam base material, and the equipotential of metal parts in the cabinet is realized.)

1. The utility model provides a exempt from instrument fast-assembling fastener that is used for between network data rack angle gauge and curb girder which characterized in that: the angle gauge is characterized by comprising an elastic sheet (20), a handle (30) and a cylindrical pin (40), wherein the elastic sheet (20) is in interference fit with the handle (30) through the cylindrical pin (40), and the handle (30) compresses the elastic sheet (20) after rotating along the cylindrical pin (40), so that the elastic sheet (20) deforms and is rapidly assembled with the side beam (50) and the angle gauge (60).

2. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 1, wherein: the specific structure of the elastic sheet (20) is as follows:

including benchmark portion (201), follow the one end setting of benchmark portion (201) is used for the first elasticity joint structure with the snap-fit of angle gauge (60), follows the other end setting of benchmark portion (201) is used for the second elasticity joint structure with curb girder (50) snap-fit, follows the left and right sides of benchmark portion (201) still forms the bow-shaped structure that supplies handle (30) compression respectively.

3. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 2, wherein: first elasticity joint structure is the first circuitous crotch structure of bending formation along anticlockwise at benchmark portion (201) upper end, first circuitous crotch structure forms the integral type structure by first book portion (2031), first flexion (204), the combination of second book portion (205) the afterbody of second book portion (205) forms arrow tail portion (206) that is used for with angle gauge (60) joint, and adjacent arrow tail portion (206) form arrow head (2061) jointly.

4. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 3, wherein: the center of the roundabout hook is split by a first opening groove (202) to form a symmetrical structure, a second opening groove (203) is formed between two sides of the roundabout hook and the upper side surface of the reference part (201), and a third opening groove (207) is formed between the left side and the right side of the arch structure relative to the reference part (201).

5. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 3, wherein: the first folding part (2031) and the second folding part (205) are both perpendicular to the reference part (201), and the first folding part (2031) and the second folding part (205) are parallel to each other.

6. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 2, wherein: second elasticity joint structure is the circuitous crotch structure of second that forms along the clockwise bending at benchmark portion (201) lower extreme, the circuitous crotch structure of second constitutes by third book portion (209), second flexion (2010), fourth book portion (2011) and forms the integral type structure the afterbody of fourth book portion (2011) is still buckled and is formed first hem face (2012).

7. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 6, wherein: third book portion (209) and fourth book portion (2011) all are perpendicular to benchmark portion (201), third book portion (209) is parallel to each other with fourth book portion (2011), first hem face (2012) is perpendicular with fourth book portion (2011), first hem face (2012) is parallel with benchmark face (201).

8. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 2, wherein: the arch structure is connected by fifth fold (2013), sixth fold (2014) and seventh fold (2015) to form an integral structure, the fifth fold (2013) and the seventh fold (2015) form an obtuse angle relative to the sixth fold (2014), and the sixth fold (2014) and the reference part (201) are parallel to each other.

9. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 4, wherein: and the groove edge corners of the second opening groove (203) and the third opening groove (207) are respectively provided with a prick (208), and the prick (208) protrudes outwards relative to the reference part (201).

10. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 1, wherein: the handle (30) is of an integrated structure formed by combining a pressing portion (301) and a pair of eccentric cams, one end of the eccentric cam is enclosed and molded by the pressing portion (301), the eccentric cam is of an outward convex structure formed by enclosing a transition surface (304), a first bottom surface (305), a first arc surface (306), a top portion (307) and a second arc surface (308), a through hole (3042) for installing a cylindrical pin (40) penetrates through a first side surface (3041) of the outward convex structure, a first opening (309) for accommodating an elastic sheet (20) is further formed in the outward convex structure, the outward convex structure is divided into a left-right two-half symmetrical structure by the first opening (309), and a second opening (3010) and a notch (3011) are further formed in each symmetrical structure.

11. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 10, wherein: the opening of the first opening (309) enables a second bottom surface (3091) and a third arc surface (3092) to be formed on the transition surface (304), the second bottom surface (3091) is tangent to the third arc surface (3092), and the third arc surface (3092) and the second arc surface (308) are coaxial and have the same center line (3015).

12. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 10, wherein: the opening of the second opening (3010) is internally provided with a first bottom arc (30101), a cutting arc surface (30102) and a side arc surface (30103), and the first bottom arc (3010) and the second arc surface (308) are coaxial and also have the same central line (3015).

13. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 10, wherein: the notch (3011) is provided with a second bottom arc (3012) and a third bottom arc (3013), and the second bottom arc (3012) and the third bottom arc (3013) are coaxial and have the same central line (3015).

14. The tool-less quick fastener for use between a network data cabinet angle gauge and a side beam of claim 10, wherein: the distance D1 between the centerline (3015) and the first bottom surface (305) is greater than the distance D2 between the centerline (3015) and the top portion (307).

Technical Field

The invention relates to the field, in particular to a tool-free quick fastener used between an angle gauge and a side beam of a network data cabinet.

Background

For an IT data cabinet, the mounting position of the side beam is generally fixed, and the front and rear positions of the angle gauge in the depth direction of the cabinet are frequently changed according to the requirements of each specific project of a customer. In the in-plant assembly stage, if a customer notifies that the assembly position of the angle gauge needs to be changed temporarily, the problem is not solved in the case of small batch, but more manual work is required to be consumed for adjustment in the case of large batch, and shift overtime is required in case of delivery urgency, so that the cost of the plant is increased sharply; in the more extreme case, the cabinets arrive at the site of a data center machine room of a client, the cabinets are combined, the design scheme of the first party is temporarily changed, and the project contractor and the cabinet manufacturer seriously influence the production efficiency of a factory in the face of the current situation of huge adjustment workload. Under the traditional mode that the angle gauge is connected with the side beam by the fastener, the adjustment of the angle gauge position needs a pneumatic or electric tool, namely, a construction site must be provided with a mobile power supply or a mobile air source, and the intangible summary increases the technical difficulty for the construction site.

Disclosure of Invention

The applicant aims at the existing problems, researches and improves, provides a tool-free quick-mounting fastener used between an angle gauge and a side beam of a network data cabinet, effectively solves the problem of installation and adjustment of the angle gauge and the side beam in an IT data cabinet, and can realize equipotential between metal parts in the cabinet.

The technical scheme adopted by the invention is as follows:

the utility model provides a exempt from instrument fast-assembling fastener for between network data rack angle gauge and curb girder comprises shell fragment, handle and cylindric lock jointly, pass through cylindric lock interference fit between shell fragment and the handle, the handle compresses the shell fragment after rotating along the cylindric lock, makes the shell fragment deformation realize with curb girder and angle gauge's rapid Assembly.

The further technical scheme is as follows:

the specific structure of the elastic sheet is as follows:

the device comprises a reference part, wherein a first elastic clamping structure used for being clamped with an angle gauge is arranged along one end of the reference part, a second elastic clamping structure used for being clamped with a side beam is arranged along the other end of the reference part, and arch structures for compressing a handle are respectively formed along the left side and the right side of the reference part;

the first elastic clamping structure is a first roundabout hook structure formed by bending the upper end of the reference part along the anticlockwise direction, the first roundabout hook structure is an integrated structure formed by combining a first folding part, a first bending part and a second folding part, an arrow tail part used for being clamped with the angle gauge is formed at the tail part of the second folding part, and an arrow head is formed at the tail parts of adjacent arrows;

the center of the roundabout hook is split by a first open slot to form a symmetrical structure, a second open slot is formed between each of two sides of the roundabout hook and the upper side face of the reference part, and a third open slot is formed between the arch structure and the left side and the right side of the reference part;

the tool-less quick fastener as claimed in claim 3, wherein the first and second fold portions are perpendicular to the reference portion, and the first and second fold portions are parallel to each other;

the second elastic clamping structure is a second roundabout hook structure formed by bending the lower end of the reference part along the clockwise direction, the second roundabout hook structure is an integrated structure formed by a third folding part, a second bending part and a fourth folding part, and the tail part of the fourth folding part is also bent to form a first folding side;

the third folding part and the fourth folding part are both vertical to the reference part, the third folding part and the fourth folding part are parallel to each other, the first folding surface and the fourth folding part are vertical, and the first folding surface and the reference surface are parallel;

the arch structure is formed into an integrated structure by connecting a fifth folding part, a sixth folding part and a seventh folding part, the fifth folding part and the seventh folding part form an obtuse angle relative to the sixth folding part, and the sixth folding part and the reference part are parallel to each other;

conical spines are arranged at the groove edge corners of the second open groove and the third open groove respectively, and the conical spines are convex relative to the reference part;

the handle is of an integrated structure formed by combining a pressing part and a pair of eccentric cams, one end of each eccentric cam is enclosed and molded by the pressing part, each eccentric cam is of an outward convex structure formed by enclosing a transition surface, a first bottom surface, a first arc surface, a top part and a second arc surface, a through hole for installing a cylindrical pin is formed in a first side surface of the outward convex structure in a penetrating mode, a first opening for accommodating an elastic sheet is further formed in the outward convex structure, the outward convex structure is divided into a left symmetrical structure and a right symmetrical structure through the first opening, and a second opening and a notch are further formed in each symmetrical structure;

the opening of the first opening enables a second bottom surface and a third arc surface to be formed on the transition surface, the second bottom surface is tangent to the third arc surface, and the third arc surface and the second arc surface are coaxial and have the same central line;

the second opening is internally provided with a first bottom arc, a cutting arc surface and a side arc surface, and the first bottom arc and the second arc surface are coaxial and also have the same central line;

the notch is provided with a second bottom arc and a third bottom arc, and the second bottom arc and the third bottom arc are coaxial and have the same central line;

the distance D1 between the centerline and the first floor is greater than the distance D2 between the centerline and the top.

The invention has the following beneficial effects:

the invention has simple structure and convenient use, the elastic sheet in the fastener can form a plurality of space elastic structures to be clamped with the angle gauge, the handle adopts an eccentric cam structure to ensure that the handle can generate a gradually increased compression amount on the arch structure of the elastic sheet, thereby realizing the tool-free rapid manual assembly and disassembly, the arrangement of the taper prick in the invention can puncture the zinc coating and the spraying coating at the contact part with the angle gauge to ensure that the angle gauge is communicated with the side beam base material, and the equipotential of metal parts in the cabinet is realized.

The installation and the adjustment of the IT cabinet angle gauge are not limited by time and occasions, and the installation and the adjustment from a factory to a construction site all day later are realized.

Drawings

FIG. 1 is an overall assembly diagram of the present invention.

Fig. 2 is a schematic diagram of the explosive structure of the present invention.

Fig. 3 is a schematic structural diagram i of the spring plate of the present invention.

Fig. 4 is a schematic structural diagram ii of the elastic sheet of the present invention.

Fig. 5 is a schematic structural view I of the handle of the present invention.

Fig. 6 is a schematic structural view ii of the handle of the present invention.

Fig. 7 is a schematic structural view of a side sill in the present invention.

FIG. 8 is a schematic view of the angle gauge of the present invention.

FIG. 9 is a schematic structural diagram II of the angle gauge of the present invention.

Fig. 10 is a schematic view showing the assembly of the angle gauge and the side member of the present invention.

FIG. 11 is a schematic view II of the assembly of the angle gauge and the side member of the present invention.

Wherein: 10. a fastener; 20. a spring plate; 201. a reference part; 202. a first open slot; 203. a second open slot; 2031. a first fold portion; 204. a first curved portion; 205. a second fold; 2051. an edge; 206. arrow tail; 2061. an arrow; 207. a third opening groove; 208. e, stabbing; 209. a third fold; 2010. a second curved portion; 2011. a fourth fold; 2012. a first hem face; 2013. a fifth fold; 2014. a sixth fold; 2015. a seventh fold portion; 2016. a second flanged surface; 30. a handle; 301. a pressing part; 302. pressing the back; 303. reinforcing ribs; 304. a transition surface; 3041. a first side surface; 3042. a through hole; 305. a first bottom surface; 306. a first arc surface; 307. a top portion; 308. a second arc surface; 309. a first opening; 3091. a second bottom surface; 3092. a third arc surface; 3093. a second side surface; 3010. a second opening; 30101. a first bottom arc; 30102. cutting an arc surface; 30103. an arc side; 3011. a notch; 3012. a second bottom arc; 3013. a third bottom arc; 3014. a limiting surface; 3015. a centerline; 40. a cylindrical pin; 401. a pyramid part; 402. a first pillar portion; 403. a second column section; 404. a column end; 50. a side beam; 501. a side sill base; 502. cutting the bottom surface of the tongue; 503. cutting the side surface of the tongue; 504. folding the first side beam; 505. folding the second side beam; 60. an angle gauge; 601. an angle gauge base; 602. a square hole; 603. a side of the angle gauge; 604. a circular via hole; 605. a square via hole; 606. a back side; 70. assembling the inner side of the node; 71. and assembling the outer side of the node.

Detailed Description

The following describes specific embodiments of the present invention.

As shown in fig. 1 and 2, the tool-free quick fastener for the angle gauge and the side beam of the network data cabinet is formed by a spring plate 20, a handle 30 and a cylindrical pin 40, wherein the spring plate 20 is in interference fit with the handle 30 through the cylindrical pin 40, and the handle 30 compresses the spring plate 20 after rotating along the cylindrical pin 40, so that the spring plate 20 deforms and the quick assembly with the side beam 50 and the angle gauge 60 is realized.

As shown in fig. 3 and 4, the specific structure of the elastic sheet 20 is as follows:

the angle gauge comprises a reference part 201, a first elastic clamping structure which is used for being clamped with the angle gauge 60 is arranged along one end of the reference part 201, a second elastic clamping structure which is used for being clamped with the side beam 50 is arranged along the other end of the reference part 201, and arch structures which are used for compressing the handle 30 are formed along the left side and the right side of the reference part 201 respectively.

As shown in fig. 3 and 4, the first elastic clamping structure is a first roundabout hook structure formed by bending the upper end of the reference portion 201 in the counterclockwise direction, the first roundabout hook structure is formed by combining a first folding portion 2031, a first bending portion 204 and a second folding portion 205 into an integral structure, an arrow tail portion 206 for clamping with the angle gauge 60 is formed at the tail portion of the second folding portion 205, and the arrow tail portions 206 adjacent to each other form an arrow 2061 together. The first fold portion 2031 and the second fold portion 205 are both perpendicular to the reference portion 201, and the first fold portion 2031 and the second fold portion 205 are parallel to each other. As shown in fig. 3 and 4, the center of the winding hook is cut by the first open groove 202 to form a symmetrical structure, the second open groove 203 is formed between both sides of the winding hook and the upper side surface of the reference portion 201, and the third open groove 207 is formed between the arch structure and the reference portion 201.

As shown in fig. 3 and 4, the second elastic latching structure is a second roundabout hook structure formed by bending the lower end of the reference portion 201 in the clockwise direction, the second roundabout hook structure is formed by forming a third fold portion 209, a second bend portion 2010, and a fourth fold portion 2011 into an integral structure, and the tail portion of the fourth fold portion 2011 is further bent to form a first fold surface 2012. Third folding portion 209 and fourth folding portion 2011 are both perpendicular to datum portion 201, third folding portion 209 and fourth folding portion 2011 are parallel to each other, first hem face 2012 is perpendicular to fourth folding portion 2011, and first hem face 2012 is parallel to datum portion 201.

As shown in fig. 3 and 4, the arch structure is formed by connecting a fifth fold 2013, a sixth fold 2014 and a seventh fold 2015 to form an integral structure, the fifth fold 2013 and the seventh fold 2015 both form an obtuse angle with respect to the sixth fold 2014, and the sixth fold 2014 and the reference 201 are parallel to each other. The groove edge corners of the second opening groove 203 and the third opening groove 207 are respectively provided with a prick 208, and the prick 208 protrudes outwards relative to the reference part 201.

As shown in fig. 5 and 6, the handle 30 is formed in an integrated structure by combining a pressing portion 301 and a pair of eccentric cams, the eccentric cams are molded around one end of the pressing portion 301, a pressing back surface 302 of the pressing portion 301 is provided with a rib 303, and the pressing portion 301 provides strength support.

The eccentric cam is enclosed by a transition surface 304, a first bottom surface 305, a first arc surface 306, a top portion 307 and a second arc surface 308 to form a convex structure, a through hole 3042 for installing the cylindrical pin 40 is formed in a first side surface 3041 of the convex structure in a penetrating manner, a first opening 309 for accommodating the elastic sheet 20 is further formed in the convex structure, the convex structure is divided into a left-right two-half symmetrical structure by the first opening 309, and a second opening 3010 and a notch 3011 are further formed in each symmetrical structure. The outer sides of the left and right bilaterally symmetric structures form a first side surface 3041.

As shown in fig. 5 and 6, the opening of the first opening 309 forms a second bottom surface 3091 and a third arc surface 3092 on the transition surface 304, the second bottom surface 3091 is tangent to the third arc surface 3092, and the third arc surface 3092 is coaxial with the second arc surface 308 and has the same center line 3015. The second opening 3010 has a first bottom arc 30101, a cutting arc surface 30102 and a side arc surface 30103 in the opening, and the first bottom arc 3010 and the second arc surface 308 are coaxial and have the same center line 3015. The notch 3011 has a second bottom arc 3012 and a third bottom arc 3013, and the second bottom arc 3012 and the third bottom arc 3013 are coaxial and have the same center line 3015.

The first opening 309 is used for accommodating a second elastic clamping structure of the elastic sheet 20, and the second opening 3010 is used for reducing the contact surface of the cylindrical pin 40 after assembly. After the second column part 403 of the cylindrical pin 40 contacts the second bottom arc 3012 of the handle 30, due to the existence of the notch 3011, the second column part 403 of the cylindrical pin 40 generates a bias moment towards the notch 3011, and after the fit clearance between the first column part 402 of the cylindrical pin 40 and the through hole 3042 of the handle 30 is eliminated, an effect close to the pin hole interference fit is generated, so that the cylindrical pin 40 is clamped and not loosened.

The distance D1 between the central line 3015 and the first bottom surface 305 is greater than the distance D2 between the central line 3015 and the top portion 307, and the difference between D1 and D2 is the operating stroke of the eccentric cam.

The specific working process of the invention is as follows:

as shown in fig. 7, 8 and 9, before the angle gauge 60 is mounted to the side member 50 through the fastener 10, a corresponding fitting structure is reserved on the side member 50. As shown in fig. 7, the side sill 50 has a side sill base 501, and the side sill base 501 is bent in the same side to form a C-shaped cross-sectional structure, wherein the structure has a first side sill flange 504 perpendicular to the side sill base 501 and parallel to each other, two second side sill flanges 505 coplanar and parallel to the side sill base 501, and the side sill base 501 is provided with cut tongues distributed in a matrix, each cut tongue has the same cut tongue ground 502 and cut tongue side 503, and the opening between the side sill base 501 and each cut tongue side 503 is the reserved clamping position.

As shown in fig. 8 and 9, the square hole 602, the circular hole 604 and the square hole 605 having the same structure and size are provided at the upper and lower ends of the angle gauge base 601 of the angle gauge 60, wherein when the square hole 602 of the angle gauge 60 is assembled with the side sill 50, the combined array of the bottom surface 502 and the side surface 503 of the tongue of the side sill 50 is adapted, the circular hole 604 of the angle gauge 60 is used for engaging the arrow 206 of the spring plate 20 in the fastener 10, and the square hole 605 of the angle gauge 60 is used for the fourth fold 2011 and the first fold surface 2012 of the spring plate 20 in the fastener 10 to pass through.

As shown in fig. 10 and 11, when the angle gauge base surface 601 of the angle gauge 60 and the side rail base surface 501 of the side rail 50 are arranged to face each other, the tongue cutting base surface 502 and the tongue cutting side surface 503 of the side rail 50 are fitted into the square hole 602 of the angle gauge 60, and the square hole side surface 603 of the angle gauge 60 is brought into contact with the tongue cutting base surface 502 of the side rail 50, the tongue cutting register 03 of the side rail 50 catches the base surface 501 of the side rail 50, and the preliminary mounting of the angle gauge 60 on the side rail 50 is realized, and the angle gauge 60 has a degree of freedom in the same direction as the tongue cutting opening on the side rail 50.

As shown in fig. 10 and 11, the arrow 2061 and arrow tail 206 of the spring plate 20 in the fastener 10 are inserted into the circular through hole 604 of the angle gauge 60, the fourth fold 2011 and the first hem surface 2012 of the spring plate 20 are inserted through the square through hole 605 of the angle gauge 60, the first hem surface 2012 perpendicular to the fourth fold 2011 is abutted against the second side rail hem 505 of the side rail 50, at this time, the base 201 and the second hem surface 2016 of the spring plate 20 are elastically abutted against the back surface 606 of the angle gauge 60, the handle 30 is pulled in the direction shown by the arrow in fig. 1, the second folded surface 2016 coplanar with the reference portion 201 elastically slides on the back surface 606 of the angle gauge 60, the first bottom surface 305 of the handle 30 is overlapped and abutted with the sixth folded portion 2014 of the elastic sheet 20, at this time, the hole distance D1 is kept, the pulling limit of the fastener 10 is reached, the prick 208 of the elastic sheet 20 penetrates into the back surface 606 of the angle gauge 60, thus, the one-sided installation of the angle gauge 60 is completed, and the installation of all the angle gauges 60 and the side beams 50 in the cabinet is completed by repeating the above actions. The inside 70 and outside 71 mounting nodes of fig. 10 and 11 illustrate a one-sided installation process of one angle gauge 60.

The invention has simple structure and convenient use, the elastic sheet in the fastener can form a plurality of space elastic structures to be clamped with the angle gauge, the handle adopts an eccentric cam structure to ensure that the handle can generate a gradually increased compression amount on the arch structure of the elastic sheet, thereby realizing the tool-free rapid manual assembly and disassembly, the arrangement of the taper prick in the invention can puncture the zinc coating and the spraying coating at the contact part with the angle gauge to ensure that the angle gauge is communicated with the side beam base material, and the equipotential of metal parts in the cabinet is realized.

The installation and the adjustment of the IT cabinet angle gauge are not limited by time and occasions, and the installation and the adjustment from a factory to a construction site all day later are realized.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the basic structure thereof.