阅读说明：本技术 一种可定位的伸缩式按钉 (Telescopic according to nail that can fix a position ) 是由 甄兆辉 曹真才 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种可定位的伸缩式按钉,插杆下端设有挤压头,插杆上端设有第一限位块,插杆上部外侧套设有柱套,柱套侧壁上设有若干第一滑道,第一滑道上端贯通地连接有第一水平卡合部；插杆一侧设有弹簧,弹簧的上端与旋帽相连接。本发明初始状态时,弹簧未被压缩,插杆下端的挤压头最大限度的向底部伸出,散热片向下安装时,挤压头先接触板卡孔进行对位,此时,向下按压旋帽,直到插杆的挤压头穿过PCB的板孔,转动旋帽将第一限位块卡合在第一水平卡合部内部进行锁紧,既保证了PCB板下空间,又实现了按钉的定位效果,避免了散热片安装时损坏板卡上的元器件。(The invention discloses a positionable telescopic press nail, wherein an extrusion head is arranged at the lower end of an insertion rod, a first limiting block is arranged at the upper end of the insertion rod, a column sleeve is sleeved on the outer side of the upper part of the insertion rod, a plurality of first slide ways are arranged on the side wall of the column sleeve, and a first horizontal clamping part is penetratingly connected to the upper end of each first slide way; one side of the inserted bar is provided with a spring, and the upper end of the spring is connected with the screw cap. When the heat radiating fin is installed downwards, the extrusion head firstly contacts the board clamping hole to align, at the moment, the screw cap is pressed downwards until the extrusion head of the insertion rod penetrates through a board hole of the PCB, the screw cap is rotated to clamp the first limiting block in the first horizontal clamping part to lock, so that the lower space of the PCB is ensured, the positioning effect of the press nail is realized, and the components on the board are prevented from being damaged when the heat radiating fin is installed.)

1. A positionable telescopic press nail comprises an insertion rod, wherein an extrusion head is arranged at the lower end of the insertion rod, and the positionable telescopic press nail is characterized in that a first limiting block is arranged at the upper end of the insertion rod, a column sleeve is sleeved on the outer side of the upper portion of the insertion rod and is of a hollow cylindrical structure, a screw cap is arranged on the upper portion of the column sleeve, a plurality of first slide ways are arranged on the side wall of the column sleeve, the first limiting block is clamped inside the first slide ways in a clearance mode, a first horizontal clamping portion is connected to the upper end of each first slide way in a penetrating mode, and the first horizontal clamping portion is arranged perpendicular to the first slide ways; a spring is arranged on one side of the inserted rod, and the upper end of the spring is connected with the screw cap; in the initial state, the spring is not compressed, and the bottom of the screw cap is separated from the top of the inserted rod under the action of the spring.

2. A positionable, telescoping push pin according to claim 1, wherein said extrusion head is provided with symmetrically arranged through slots.

3. The positionable telescopic thumb pin according to claim 1, wherein a clamping block is provided in the middle of the plunger, the clamping block has a non-circular cross-section, the clamping block is mounted inside the mounting hole of the heat sink with a clearance, and the cross-section of the mounting hole of the heat sink is the same as the cross-section of the clamping block.

4. A positionable, telescoping push pin according to claim 1 wherein said top of said cap is provided with an unlocking indicia.

5. The positionable telescopic press nail according to claim 1, wherein a plurality of second limiting blocks are arranged at the upper part of the inserting rod, and the outer diameter of each second limiting block is larger than the diameter of the heat radiating fin mounting hole; the column sleeve is provided with a plurality of second slideways, the lower ends of the second slideways are provided with openings, the second slideways are in clearance fit with the second limiting blocks, and the upper parts of the second slideways are provided with second horizontal clamping parts which are horizontally arranged; when the column sleeve is pressed downwards, the second limiting block slides into the second slide way, and when the column sleeve is rotated, the second limiting block is clamped in the second horizontal clamping portion.

6. The positionable telescopic thumb nail according to claim 5, wherein a first clamping groove is formed in the lower portion of the tail end of the first horizontal clamping portion, the width of the first clamping groove is larger than the width of the first limiting block, a second clamping groove is formed in the lower portion of the tail end of the second horizontal clamping portion, the width of the second clamping groove is larger than the width of the second limiting block, and after the column sleeve rotates to the proper position, the first limiting block and the second limiting block are clamped in the first clamping groove and the second clamping groove respectively under the action of elastic force.

7. The positionable telescopic push pin according to claim 1, wherein an open slot is formed at the upper end of the inserted bar, and the open slot is formed in the middle of the first limiting blocks at both sides.

8. The positionable telescopic push pin according to claim 7, wherein a top plate is connected to a lower portion of the screw cap, and a chamfer is provided at a lower end of the top plate, and the top plate is inserted into the opening groove of the insertion rod after the screw cap is pressed downward.

9. A positionable, telescoping push pin according to any of claims 1-8 wherein said spring is disposed externally of the plunger, the lower end of said spring abutting the catch of the heat sink.

10. A positionable, telescoping push pin according to any of claims 1-8, wherein said spring is disposed within the collar and the lower end of the spring is attached to the top of the plunger.

Technical Field

The invention belongs to the technical field of cooling fin assembly, and particularly relates to a positionable telescopic press pin.

Background

In the field of servers, heat dissipation fins need to be installed above some board card chips, the existing heat dissipation fin installation technology is to install the heat dissipation fins from the top of the chips to the bottom in a blind mode, then press a push pin (push pin) to a corresponding hole at the board end, as shown in fig. 1, a spring is sleeved outside the push pin, in an initial state, an extrusion head at the lower portion of the push pin is attached to the lower surface of the heat dissipation fins under the elastic force action of the spring, the extension portion of the extrusion head of the push pin is too short, when the bottom surface of the heat dissipation fins contacts the upper surface of the chip, the lower end of the extrusion head cannot extend into a board hole of a PCB, the positioning effect cannot be achieved, the position of the push pin needs to be adjusted manually for multiple times, the push pin needs to be pressed tentatively, and the hole can be inserted into the heat dissipation fins accurately. The operation mode is easy to touch components on the board card, and the components are damaged. Generally, the positioning effect can be achieved by simply lengthening the length of the extrusion head, but the space from the board card to the bottom of the tray is increased, and the solution has great limitation due to the limitation of the design space of the server.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a positionable telescopic press nail, wherein a column sleeve is arranged at the upper part of an insertion rod, a plurality of first limiting blocks are arranged at the upper end of the insertion rod, a plurality of first slide ways corresponding to the first limiting blocks are arranged on the column sleeve, a spring is arranged on one side of the insertion rod, the upper end of the spring is connected with a screw cap, the spring is not compressed in an initial state, an extrusion head at the lower end of the insertion rod extends to the bottom to the maximum extent, when a radiating fin is installed downwards, the extrusion head firstly contacts a board clamping hole for alignment, at the moment, the screw cap is pressed downwards until the extrusion head of the insertion rod passes through the hole of a PCB, and the screw cap is rotated to clamp the first limiting blocks in the first horizontal clamping part for locking, so that the space below the PCB is ensured, the positioning effect of the press nail is realized, and the components on a board card are prevented from being damaged when the radiating fin is installed.

In order to achieve the purpose, the invention adopts the technical scheme that:

a telescopic thumb pin capable of being positioned comprises an insertion rod, wherein an extrusion head is arranged at the lower end of the insertion rod and used for guiding and locking with a hole of a PCB (printed circuit board), a first limiting block is arranged at the upper end of the insertion rod, a column sleeve is sleeved on the outer side of the upper portion of the insertion rod and is of a hollow cylindrical structure, a screw cap is arranged at the upper portion of the column sleeve so as to facilitate force application when the column sleeve is rotated and locked, a plurality of first slide ways are arranged on the side wall of the column sleeve, the first limiting block is clamped in the first slide ways in a clearance mode, a first horizontal clamping portion is connected to the upper end of each first slide way in a penetrating mode, and the first horizontal clamping portion is arranged perpendicular to the first slide ways; one side of the inserted bar is provided with a spring, and the upper end of the spring is connected with the screw cap.

When the cooling fin is installed downwards, the extrusion head first contacts the board clamping hole to align, at the moment, the screwing cap is pressed downwards, the first limiting block slides upwards in the first slide way, the spring is compressed, the gap between the screwing cap and the top of the inserting rod is reduced until the first limiting block abuts against the upper wall of the first slide way, the extrusion head of the inserting rod penetrates through a board hole of the PCB at the moment, then the screwing cap is rotated to lock the first limiting block inside the first horizontal clamping portion, the lower space of the PCB is guaranteed, the positioning effect of pressing a nail is achieved, and components on the board are prevented from being damaged when the cooling fin is installed.

As a further preferred option of this technical scheme, be equipped with symmetrical arrangement's logical groove on the extrusion head, lead to the inboard shrink when the extrusion head passes the diaphragm orifice of PCB integrated circuit board of being convenient for, the extrusion head of being convenient for passes the PCB diaphragm orifice smoothly and avoids the PCB integrated circuit board to damage.

As a further preferred option of the technical scheme, a fixture block is arranged in the middle of the inserted rod, the section of the fixture block is non-circular, the fixture block is made of plastic, the fixture block is installed inside the installation hole of the heat sink in a clearance manner, and the section of the installation hole of the heat sink is the same as that of the fixture block; the fixture block limits the rotation of the insertion rod, and the situation that the insertion rod rotates along with the screw cap when the screw cap rotates, and the first limiting block cannot be clamped into the first horizontal clamping portion is avoided.

As a further optimization of the technical scheme, the unlocking mark is arranged on the upper part of the screw cap, so that an operator can quickly judge the locking and unlocking operation directions.

As a further preference of the technical scheme, the upper part of the inserted rod is provided with a plurality of second limiting blocks, the outer diameter of each second limiting block is larger than the diameter of the mounting hole of the radiating fin, so that the inserted rod is prevented from falling from the lower part of the mounting hole of the radiating fin when the inserted rod is assembled in the mounting hole of the radiating fin; the column sleeve is provided with a plurality of second slideways, the lower ends of the second slideways are provided with openings, the second slideways are in clearance fit with the second limiting blocks, and the upper parts of the second slideways are provided with second horizontal clamping parts which are horizontally arranged; when the column sleeve is pressed downwards, the second limiting block slides into the second slide way, and when the column sleeve is rotated, the second limiting block is clamped in the second horizontal clamping portion, so that the column sleeve and the first limiting block are synchronously clamped.

As a further optimization of the technical scheme, the lower part of the tail end of the first horizontal clamping portion is provided with a first clamping groove, the width of the first clamping groove is larger than that of the first limiting block, the lower part of the tail end of the second horizontal clamping portion is provided with a second clamping groove, the width of the second clamping groove is larger than that of the second limiting block, and after the column sleeve rotates to a certain position, the first limiting block and the second limiting block are respectively clamped inside the first clamping groove and the second clamping groove under the action of elastic force, so that the separation of the column sleeve and the inserted rod caused by the reverse rotation of the screw cap under the condition of misoperation or accidental situations of workers is avoided, and the locking effect of the radiating fin is further influenced.

As a further preferred option of this technical scheme, the inserted bar upper end is equipped with the open slot, the open slot sets up in the middle of the first stopper of both sides, and the open slot is convenient for the inserted bar upper portion to shrink to the inboard when installing the first slide of column jacket inside.

As a further preferred of this technical scheme, it has the roof to revolve cap sub-unit connection, and the lower extreme of roof is equipped with the chamfer, revolves the cap and presses down the back, and the roof is pegged graft inside the open slot of inserted bar, has avoided first stopper to break away from first spout inboard, and the chamfer is convenient for the roof accurately to inserting with the open slot fast.

As a further preferred option of this technical scheme, the spring sets up in the outside of inserted bar, the lower extreme of spring offsets with the integrated circuit board of fin, sets up the spring in the outer wall of inserted bar, and the at utmost of being convenient for reduces to turn on the cap to push down the clearance of back cap and inserted bar top soon to reduce the overall dimension after installing according to the nail, enlarge the inside space utilization of server.

As a further preferred option of the technical solution, the spring is arranged inside the column sleeve, and the lower end of the spring is connected with the top of the inserted link; the spring is arranged inside the column sleeve in a hidden mode, the attractiveness of the press nail is enhanced, and the influence of the spring on the internal circuit of the server is avoided.

The invention has the beneficial effects that:

1) according to the invention, the upper part of the insertion rod is provided with the column sleeve, the upper end of the insertion rod is provided with the first limiting blocks, the column sleeve is provided with the first slide ways corresponding to the first limiting blocks, one side of the insertion rod is provided with the spring, the upper end of the spring is connected with the screw cap, the spring is not compressed in an initial state, the extrusion head at the lower end of the insertion rod extends out to the bottom to the maximum extent, when the radiating fin is installed downwards, the extrusion head firstly contacts the board clamping hole to align, at the moment, the screw cap is pressed downwards until the extrusion head of the insertion rod passes through a board hole of the PCB, the screw cap is rotated to clamp the first limiting blocks in the first horizontal clamping part to lock, so that the space below the PCB is ensured, the positioning effect of a press nail is realized, and the components on the board are prevented from being damaged when the radiating fin is installed.

2) The extrusion head is provided with the through grooves which are symmetrically arranged, the through grooves facilitate the extrusion head to contract inwards when passing through the hole of the PCB board card, and the extrusion head is convenient to smoothly pass through the hole of the PCB board card to avoid the damage of the PCB board card.

3) A clamping block is arranged in the middle of the inserted rod, the section of the clamping block is non-circular, the clamping block is made of plastic, the clamping block is arranged inside the mounting hole of the radiating fin in a clearance mode, and the section of the mounting hole of the radiating fin is the same as the appearance section of the clamping block; the fixture block limits the rotation of the insertion rod, and the situation that the insertion rod rotates along with the screw cap when the screw cap rotates, and the first limiting block cannot be clamped into the first horizontal clamping portion is avoided.

4) The upper part of the screw cap is provided with an unlocking mark, so that an operator can quickly judge the locking and unlocking operation directions.

5) The upper part of the insertion rod is provided with a plurality of second limiting blocks, the outer diameter of each second limiting block is larger than the diameter of the mounting hole of the radiating fin, and the insertion rod is prevented from falling from the lower part of the mounting hole of the radiating fin when the insertion rod is assembled in the mounting hole of the radiating fin; the column sleeve is provided with a plurality of second slideways, the lower ends of the second slideways are provided with openings, the second slideways are in clearance fit with the second limiting blocks, and the upper parts of the second slideways are provided with second horizontal clamping parts which are horizontally arranged; when the column sleeve is pressed downwards, the second limiting block slides into the second slide way, and when the column sleeve is rotated, the second limiting block is clamped in the second horizontal clamping portion, so that the column sleeve and the first limiting block are synchronously clamped.

6) The terminal lower part of first horizontal block portion is equipped with first draw-in groove, the width of first draw-in groove is greater than the width of first stopper, the terminal lower part of second horizontal block portion is equipped with the second draw-in groove, the width of second draw-in groove is greater than the width of second stopper, the column jacket is rotatory to the back of putting, first stopper and second stopper block respectively under the effect of elasticity inside first draw-in groove and second draw-in groove, it causes the column jacket to separate with the inserted bar to have avoided under staff's maloperation or the unexpected situation to revolve the cap reversal, and then the locking effect of influence fin.

7) The inserted bar upper end is equipped with the open slot, and the open slot sets up in the middle of the first stopper of both sides, and the open slot is convenient for the first slide of column jacket when installing on inserted bar upper portion to inside shrink.

8) The lower part of the rotating cap is connected with the top plate, the lower end of the top plate is provided with a chamfer, the rotating cap presses downwards, the top plate is inserted into the open slot of the inserted bar, the first limiting block is prevented from being separated from the inner side of the first sliding slot, and the chamfer is convenient for the top plate to be rapidly and accurately inserted into the open slot.

9) The spring sets up in the outside of inserted bar, and the lower extreme of spring offsets with the integrated circuit board of fin, sets up the spring in the outer wall of inserted bar, and the at utmost of being convenient for reduces to revolve cap and push down the clearance at back spiral cap and inserted bar top soon to reduce the overall dimension after the installation of pressing the nail, enlarge the inside space utilization of server.

10) The spring is arranged in the column sleeve, and the lower end of the spring is connected with the top of the inserted bar; the spring is arranged inside the column sleeve in a hidden mode, the attractiveness of the press nail is enhanced, and the influence of the spring on the internal circuit of the server is avoided.

Drawings

FIG. 1 is a diagram illustrating the state of the art of use of a push pin.

FIG. 2 is a diagram illustrating the use of a positionable retractable push pin according to the present invention.

Fig. 3 is an assembly schematic view of an embodiment 1 of the positionable telescopic push pin of the present invention.

Fig. 4 is an exploded view of an embodiment 1 of a positionable telescopic push pin of the present invention.

Fig. 5 is a schematic assembly view of an embodiment 2 of a positionable telescopic push pin of the present invention.

Fig. 6 is an exploded view of an embodiment 2 of a positionable telescopic push pin of the present invention.

FIG. 7 is a schematic view of the internal structure of a positionable telescopic post-in-post sleeve of the present invention.

In the figure: 1. a heat sink; 2. pressing a nail; 3. an extrusion head; 4. a spring; 5. inserting a rod; 6. a through groove; 7. a clamping block; 8. a second limiting block; 9. a first stopper; 10. an open slot; 11. screwing the cap; 12. an unlocking identifier; 13. a column sleeve; 14. a first slideway; 15. a first horizontal engaging portion; 16. a first card slot; 17. a second slideway; 18. a second horizontal engaging portion; 19. a second card slot; 20. a top plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 7, 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the devices or elements referred to must have a specific orientation, a specific orientation configuration and operation, and thus, are not to be construed as limiting the present invention.

Example 1

As shown in fig. 2-4 and 7, a positionable telescopic push pin comprises an insertion rod 5, wherein an extrusion head 3 is arranged at the lower end of the insertion rod 5 and used for guiding and locking with a hole of a PCB (printed circuit board), a first limiting block 9 is arranged at the upper end of the insertion rod 5, a column sleeve 13 is sleeved on the outer side of the upper portion of the insertion rod 5, the column sleeve 13 is of a hollow tubular structure, a screw cap 11 is arranged at the upper portion of the column sleeve 13 so as to facilitate force application when the column sleeve 13 is rotated and locked, a plurality of first slide ways 14 are arranged on the side wall of the column sleeve 13, the first limiting block 9 is clamped inside the first slide ways 14 in a clearance manner, a first horizontal clamping portion 15 is penetratingly connected to the upper end of the first slide ways 14, and the first horizontal clamping portion 15 is arranged perpendicular to the first slide ways 14; and a spring 4 is arranged on one side of the inserted bar 5, and the upper end of the spring 4 is connected with a screw cap 11.

In the initial state, the spring 4 is not compressed, the bottom of the screw cap 11 is separated from the top of the inserted rod 5 under the action of the spring 4, is used for compensating the length of the upper part of the inserted bar 5, so that the extrusion head 3 at the lower end of the inserted bar 5 extends out to the bottom to the maximum extent, when the radiating fin 1 is installed downwards, the extrusion head 3 firstly contacts the board clamping hole for alignment, at the moment, the turncap 11 is pressed downwards, the first limit block 9 slides upwards in the first slide way 14, the spring 4 is compressed, the gap between the turncap 11 and the top of the inserted link 5 is reduced until the first limit block 9 abuts against the upper wall of the first slide way 14, at the moment, the extrusion head 3 of the inserted link 5 penetrates through the board hole of the PCB, then rotate and revolve cap 11 and block first stopper 9 inside first horizontal block portion 15 and lock, both guaranteed PCB board lower space, realized the location effect of button again, damaged the components and parts on the integrated circuit board when having avoided fin 1 to install.

As shown in fig. 3-4, in this embodiment, the spring 4 is disposed outside the insertion rod 5, the lower end of the spring 4 abuts against the board of the heat sink 1, and the spring 4 is disposed on the outer wall of the insertion rod 5, so as to reduce the gap between the screw cap 11 and the top of the insertion rod 5 after the screw cap 11 is pressed down to the greatest extent, thereby reducing the overall size after the screw is installed and increasing the space utilization rate inside the server.

As shown in fig. 3, in this embodiment, the extrusion head 3 is provided with the through grooves 6 symmetrically arranged, the through grooves 6 are convenient for the extrusion head 3 to contract inward when passing through the hole of the PCB board, and the extrusion head 3 is convenient to smoothly pass through the hole of the PCB board to avoid the damage of the PCB board.

As shown in fig. 3-4, in this embodiment, a fixture block 7 is disposed in the middle of the insertion rod 5, the section of the fixture block 7 is non-circular, the fixture block 7 is made of plastic, the fixture block 7 is mounted inside the mounting hole of the heat sink 1 with a gap, and the section of the mounting hole of the heat sink 1 is the same as that of the fixture block 7; the fixture block 7 limits the rotation of the insertion rod 5, so that the situation that the insertion rod 5 rotates along with the screw cap 11 when the screw cap 11 rotates, and the first limiting block 9 cannot be clamped into the first horizontal clamping part 15 is avoided.

As shown in fig. 3-4, in the present embodiment, an unlocking sign 12 is disposed on the upper portion of the screw cap 11, so that an operator can quickly determine the operation directions of locking and unlocking.

As shown in fig. 4 and 6, in this embodiment, a plurality of second limit blocks 8 are arranged on the upper portion of the insertion rod 5, and the outer diameter of the second limit blocks 8 is larger than the diameter of the mounting hole of the heat sink 1, so that the insertion rod 5 is prevented from falling from the lower portion of the mounting hole of the heat sink 1 when the insertion rod 5 is assembled in the mounting hole of the heat sink 1; a plurality of second slide ways 17 are arranged on the column sleeve 13, the lower ends of the second slide ways 17 are open, the second slide ways 17 are in clearance fit with the second limiting blocks 8, and the upper parts of the second slide ways 17 are provided with second horizontal clamping parts 18 which are horizontally arranged; when the column sleeve 13 is pressed downwards, the second limiting block 8 slides into the second slide way 17, and when the column sleeve 13 is rotated, the second limiting block 8 is clamped in the second horizontal clamping part 18, so that the synchronous clamping with the first limiting block 9 is realized.

As shown in fig. 4-6, in this embodiment, the lower portion of the end of the first horizontal engaging portion 15 is provided with a first engaging groove 16, the width of the first engaging groove 16 is greater than the width of the first limiting block 9, the lower portion of the end of the second horizontal engaging portion 18 is provided with a second engaging groove 19, the width of the second engaging groove 19 is greater than the width of the second limiting block 8, and after the column sleeve 13 rotates in place, the first limiting block 9 and the second limiting block 8 are respectively engaged with the first engaging groove 16 and the second engaging groove 19 under the action of elastic force, so that the separation of the column sleeve 13 from the inserting rod 5 due to the reverse rotation of the screw cap 11 under the condition of misoperation or accident of a worker is avoided, and the locking effect of the heat sink 1 is further affected.

As shown in fig. 4 and 6, in this embodiment, an open slot 10 is formed at the upper end of the insertion rod 5, the open slot 10 is disposed in the middle of the first limiting blocks 9 at both sides, and the open slot 10 facilitates the inward contraction of the upper portion of the insertion rod 5 when the upper portion is mounted inside the first slide way 14 of the column sleeve 13.

As shown in fig. 7, in this embodiment, the lower portion of the screw cap 11 is connected with a top plate 20, and the lower end of the top plate 20 is provided with a chamfer, after the screw cap 11 is pressed downwards, the top plate 20 is inserted into the opening groove 10 of the insertion rod 5, so that the first limiting block 9 is prevented from being separated from the inner side of the first sliding groove, and the chamfer is convenient for the top plate 20 to be rapidly and accurately inserted into the opening groove 10.

Example 2

Unlike embodiment 1, as shown in fig. 5 to 6, in this embodiment, the spring 4 is disposed inside the column cover 13, and the lower end of the spring 4 is connected to the top of the plunger 5; the spring 4 is arranged inside the column sleeve 13 in a hidden mode, the attractiveness of the button is enhanced, and the influence of the spring 4 on the internal circuit of the server is avoided.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.