阅读说明：本技术 一种铸造用落砂机 (Shakeout machine for casting ) 是由 郑焕芝 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种铸造用落砂机,包括固定支架,固定支架包括有矩形框,矩形框内部安装有铸件固定组件,铸件固定组件包括有固定箱,固定箱相邻的两侧均安装有震动板,铸件固定组件底端安装有破碎组件,破碎组件包括有两组的滤板,固定支架内部一角处安装有震动组件,震动组件包括有固定框,固定框内部安装有震动箱,震动箱对称的两侧安装有对称的第二移动杆,震动箱内部安装有装置箱,装置箱内部卡设有对称的第一移动杆。利用装置箱不断的进行偏转,使固定箱内部的铸件上的型砂能够从铸件上落下,利用两组不同方向往复移动的滤板不断的移动,对大团的型砂进行破碎。(The invention discloses a shakeout machine for casting, which comprises a fixed support, wherein the fixed support comprises a rectangular frame, a casting fixing assembly is arranged in the rectangular frame, the casting fixing assembly comprises a fixed box, vibration plates are respectively arranged on two adjacent sides of the fixed box, a crushing assembly is arranged at the bottom end of the casting fixing assembly and comprises two groups of filter plates, the vibration assembly is arranged at one corner in the fixed support and comprises a fixed frame, a vibration box is arranged in the fixed frame, symmetrical second moving rods are arranged on two symmetrical sides of the vibration box, a device box is arranged in the vibration box, and symmetrical first moving rods are clamped in the device box. Utilize the device case to deflect constantly, make the molding sand on the inside foundry goods of fixed case fall from the foundry goods, utilize two sets of not equidirectional reciprocating motion's the continuous removal of filter plate, carry out the breakage to the molding sand of big group.)

1. The utility model provides a shakeout machine is used in casting, includes fixed bolster (1), its characterized in that: the fixed support (1) comprises a rectangular frame (101), a first fixed seat (105) is installed at one corner inside the rectangular frame (101), second fixed seats (108) are installed on two adjacent sides inside the rectangular frame (101), a casting fixing component (2) is installed inside the rectangular frame (101), the casting fixing component (2) comprises a fixed box (201), symmetrical sliding rods (202) penetrate through two symmetrical sides of the fixed box (201) in a sliding mode, a clamping plate (204) is installed at one end of each symmetrical sliding rod (202), symmetrical offset columns (206) are installed on two adjacent sides of the fixed box (201), a vibration plate (207) is installed on one side of each offset column (206), and a crushing component (3) is installed at the bottom end of the casting fixing component (2);

broken subassembly (3) is including two sets of filter plates (301), offset plate (302) are installed to filter plate (301) one side, vibrations subassembly (4) are installed to the inside one angle department of fixed bolster (1), vibrations subassembly (4) are including fixed frame (401), fixed frame (401) internally mounted has vibrations case (402), the second carriage release lever (421) of symmetry are installed to the both sides of vibrations case (402) symmetry, vibrations case (402) internally mounted has device case (403), the inside card of device case (403) is equipped with first carriage release lever (416) of symmetry, the cover is equipped with second spring (417) of symmetry on first carriage release lever (416), the inside card of device case (403) is equipped with axis of rotation (405) of symmetry, the equal card in axis of rotation (405) both ends is equipped with eccentric block (407).

2. The shakeout machine for casting as claimed in claim 1, wherein the lower ends of two adjacent sides of the rectangular frame (101) are provided with first limiting holes (102), the offset plate (302) is slidably clamped in the first limiting holes (102), the upper ends of two adjacent sides of the rectangular frame (101) are provided with second limiting holes (103), and the symmetrical offset columns (206) are slidably clamped in the second limiting holes (103).

3. A casting shakeout machine as claimed in claim 1, wherein the first fixed base (105) is internally provided with a first fixed shaft (106), the first fixed shaft (106) is rotatably clamped with two symmetrical sets of first limiting seats (107), the two sets of first limiting seats (107) are distributed at right angles, the second fixed base (108) is internally provided with a second fixed shaft (109), the middle end of the second fixed shaft (109) is clamped with a first bearing (110), and the outer side of the first bearing (110) is provided with a second limiting seat (111).

4. The shakeout machine for casting as claimed in claim 1, wherein the bottom end inside the fixed box (201) is provided with a filter plate (301), the symmetrical sliding rods (202) are provided with screw rods (203) therebetween, one end of each screw rod (203) is rotatably clamped at the center of one side of each clamping plate (204), the other side of each clamping plate (204) is provided with a plurality of limiting rods (205), the screw rods (203) are threadedly clamped at the symmetrical two sides of the fixed box (201), and the screw rods (203) at one side penetrate through the rectangular frame (101) in a sliding manner.

5. A foundry shakeout machine according to claim 2, characterized in that two sets of filter plates (301) are in contact with each other, first springs (303) are mounted on two symmetrical sides of the offset plate (302), first hinge seats (304) are mounted at the other ends of the first springs (303), fixing pins (306) are clamped on the first hinge seats (304), second hinge seats (305) are clamped at two ends of the fixing pins (306), and the other ends of the symmetrical second hinge seats (305) are fixedly mounted on two symmetrical sides inside the first limiting holes (102).

6. A shakeout machine for casting as claimed in claim 3, wherein the other ends of the symmetrical first position-limiting seats (107) are fixedly connected to the two adjacent sides of the fixed box (201), the two sets of second position-limiting seats (111) and the filter plate (301) are vertically distributed, and the second position-limiting seats (111) and one side of the filter plate (301) in the same layer are fixedly connected.

7. The shakeout machine for casting as claimed in claim 1, wherein the fixed frame (401) is fixedly connected with the rectangular frame (101) through a support rod, a symmetrical second bearing (404) is clamped on the rotating shaft (405), the second bearing (404) is installed inside the device box (403), a limit ring (406) is installed on one side of the second bearing (404), the limit ring (406) is clamped on the rotating shaft (405), clamping rings (408) are respectively clamped on two sides of the eccentric block (407), the clamping rings (408) are clamped on the rotating shaft (405), a driven wheel (409) is clamped on the rotating shaft (405), a belt (410) is sleeved outside the driven wheel (409), a driving wheel (411) is sleeved on the other end of the belt (410), a driving shaft (412) is installed at the center of the symmetrical driving wheel (411), two groups of symmetrical third bearings (413) are clamped on the driving shaft (412), a supporting seat (414) is installed outside the third bearing (413), two ends of the supporting seat (414) are fixedly connected with the inner wall of the device box (403), one end of the driving shaft (412) is provided with a driving motor (415), and the driving motor (415) is fixedly arranged inside the device box (403).

8. A foundry shakeout machine according to claim 1, characterized in that the eccentric blocks (407) engaged with both ends of the symmetrical rotating shaft (405) are arranged at right angles to each other, the first movable rod (416) is slidably inserted through the fixed frame (401) and the vibration box (402), both ends of the symmetrical second spring (417) are fixedly connected to the inner side of the fixed frame (401) and the outer side of the vibration box (402) and the inner side of the vibration box (402) and the outer side of the device box (403), respectively, the second movable rod (421) is engaged with the second spring (417), and both ends of the second spring (417) are fixedly connected to the inner side of the fixed frame (401) and the outer side of the vibration box (402), respectively.

9. A foundry shakeout machine according to claim 1, wherein the symmetrical first movable bar (416) is provided at both ends thereof with movable seats (418), the bottom ends of the symmetrical moving seats (418) are provided with connecting plates (419), the bottom ends of the symmetrical connecting plates (419) are provided with moving plates (420), the other end of the second moving rod (421) is provided with the moving seat (418), connecting plate (419) and movable plate (420) are installed to removal seat (418) bottom of symmetry, removal seat (418) of first carriage release lever (416) and second carriage release lever (421) one end can contact with vibrations board (207) one side, set up two sets of sliding holes (104) in addition on rectangular frame (101), sliding holes (104) can be run through in removal seat (418) of first carriage release lever (416) and second carriage release lever (421) other end, movable plate (420) one end of first carriage release lever (416) and second carriage release lever (421) below can contact with skew board (302) one side.

Technical Field

The invention relates to the technical field of casting, in particular to a shakeout machine for casting.

Background

The shakeout of the casting is one of the important processes in the sand casting production process. The shakeout is that after a casting mold is poured and cooled to a certain temperature, the casting mold is broken, the casting mold is separated from a sand box, and a casting is separated from molding sand. At present, in the process of producing sand casting, the process link of casting shakeout still lags behind the development of molding mechanization, even molding sand separation is carried out manually, and the efficiency of casting production and processing is greatly limited.

The existing shakeout machine vibrates vertically mostly, so that molding sand on a casting is separated from the casting, the shakeout efficiency is low, the shakeout machine is vibrating, and because there is no damping component, long-time vibration can cause damage to the device, the service life of the device is influenced, and when the molding sand drops from the casting, a part of large-cluster molding sand can exist, and the traditional shakeout machine can not carry out crushing treatment on the molding sand.

Disclosure of Invention

The invention aims to provide a shakeout machine for casting, which solves the problems in the background technology.

In order to solve the technical problems, the invention adopts the following technical scheme: a casting shakeout machine comprises a fixed support, the fixed support comprises a rectangular frame, a first fixed seat is arranged at one corner inside the rectangular frame, a second fixed seat is arranged at two adjacent sides inside the rectangular frame, a casting fixing component is arranged inside the rectangular frame, the casting fixing component comprises a fixed box, symmetrical sliding rods penetrate through two symmetrical sides of the fixed box in a sliding manner, a clamping plate is arranged at one end of each symmetrical sliding rod, symmetrical offset columns are arranged at two adjacent sides of the fixed box, a vibration plate is arranged at one side of each offset column, a crushing component is arranged at the bottom end of the casting fixing component and comprises two groups of filter plates, the offset plates are arranged at one side of each filter plate, the vibration component is arranged at one corner inside the fixed support and comprises a fixed frame, a vibration box is arranged inside the fixed frame, symmetrical second movable rods are arranged at two symmetrical sides of the vibration box, and a device box is arranged inside the vibration box, the inside card of device case is equipped with the first carriage release lever of symmetry, and the cover is equipped with the second spring of symmetry on the first carriage release lever, and the inside card of device case is equipped with the axis of rotation of symmetry, and the axis of rotation both ends all block and are equipped with the eccentric block.

Preferably, the lower ends of two adjacent sides of the rectangular frame are provided with first limiting holes, the offset plate is slidably clamped in the first limiting holes, the upper ends of two adjacent sides of the rectangular frame are provided with second limiting holes, and the symmetric offset columns are slidably clamped in the second limiting holes.

Preferably, first fixing base internally mounted has first fixed axle, rotates the card on the first fixed axle and is equipped with the first spacing seat of two sets of symmetries, and two sets of first spacing seats are the right angle and distribute, and second fixing base internally mounted has the second fixed axle, and the card is equipped with first bearing in the second fixed axle middle-end, and the spacing seat of second is installed in the first bearing outside.

Preferably, the filter plate is installed to fixed incasement portion bottom, installs the screw rod between the slide bar of symmetry, screw rod one end rotate the card locate with splint one side center department, a plurality of gag lever post is installed to the splint opposite side, the both sides of fixed incasement symmetry are located to the screw rod screw thread card, the screw rod of one side slides and runs through the rectangle frame.

Preferably, two sets of filter plates contact each other, and first spring is all installed to the both sides of skew board symmetry, and first articulated seat is installed to the first spring other end, and the card is equipped with the fixed pin on the first articulated seat, and the card of fixed pin both ends is equipped with the articulated seat of second, and the articulated seat other end fixed mounting of second of symmetry is in the both sides of first spacing downthehole symmetry.

Preferably, the other ends of the symmetrical first limiting seats are fixedly connected with two adjacent sides of the fixed box respectively, the two groups of second limiting seats and the filter plate are distributed up and down, and the second limiting seat on the same layer is fixedly connected with one side of the filter plate.

Preferably, fixed frame passes through branch and rectangle frame fixed connection, the card is equipped with the second bearing of symmetry in the axis of rotation, the second bearing is installed inside the device case, the spacing ring is installed to second bearing one side, the spacing ring card is located in the axis of rotation, eccentric block both sides all block and are equipped with the snap ring, the snap ring card is located in the axis of rotation, the card is equipped with from the driving wheel in the axis of rotation, it is equipped with the belt to overlap from the driving wheel outside, belt other pot head is equipped with the action wheel, the drive shaft is installed to the action wheel center department of symmetry, the card is equipped with the third bearing of two sets of symmetries in the drive shaft, the supporting seat is installed in the third bearing outside, supporting seat both ends and device incasement wall fixed connection, driving motor is installed to drive shaft one end, driving motor fixed mounting is inside the device case.

Preferably, the eccentric block that the rotation axis both ends card of symmetry was established is the right angle distribution each other, and first carriage release lever slides and runs through fixed frame and vibrations case, the second spring both ends of symmetry respectively with fixed frame inboard and the vibrations case outside and vibrations incasement side and device case outside fixed connection, the card is equipped with the second spring on the second carriage release lever, the second spring both ends respectively with fixed frame inboard and the vibrations case outside fixed connection.

Preferably, the removal seat is all installed at the first carriage release lever both ends of symmetry, the connecting plate is installed to the removal seat bottom of symmetry, the movable plate is installed to the connecting plate bottom of symmetry, the removal seat is installed to the second carriage release lever other end, connecting plate and movable plate are installed to the removal seat bottom of symmetry, the removal seat of first carriage release lever and second carriage release lever one end can contact with vibrations board one side, set up two sets of sliding holes in addition on the rectangular frame, the removal seat of the first carriage release lever and the second carriage release lever other end can run through the sliding hole, movable plate one end of first carriage release lever and second carriage release lever below can contact with skew board one side.

The invention uses the device box to continuously deflect, so that the molding sand on the casting in the fixed box can fall off the casting, and uses two groups of filter plates which reciprocate in different directions to continuously move to crush the large-sized molding sand.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a cross-sectional view of the vibration module of the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 2 according to the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 2 according to the present invention;

FIG. 6 is an enlarged view of the structure at C of FIG. 2 according to the present invention;

FIG. 7 is an enlarged view of the structure shown at D in FIG. 3 according to the present invention;

in the figure: 1. fixing a bracket; 101. a rectangular frame; 102. a first limit hole; 103. a second limiting hole; 104. a slide hole; 105. a first fixed seat; 106. a first fixed shaft; 107. a first limiting seat; 108. a second fixed seat; 109. a second fixed shaft; 110. a first bearing; 111. a second limiting seat; 2. a casting securing assembly; 201. a fixed box; 202. a slide bar; 203. a screw; 204. a splint; 205. a limiting rod; 206. an offset column; 207. a vibration plate; 3. a crushing assembly; 301. filtering the plate; 302. a bias plate; 303. a first spring; 304. a first hinge mount; 305. a second hinge mount; 306. a fixing pin; 4. a vibration assembly; 401. a fixing frame; 402. a vibration box; 403. a device case; 404. a second bearing; 405. a rotating shaft; 406. a limiting ring; 407. an eccentric block; 408. a snap ring; 409. a driven wheel; 410. a belt; 411. a driving wheel; 412. a drive shaft; 413. a third bearing; 414. a supporting seat; 415. a drive motor; 416. a first movable bar; 417. a second spring; 418. a movable seat; 419. a connecting plate; 420. moving the plate; 421. a second travel bar.

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. 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.

Example (b): as shown in fig. 1 to 7, the invention provides a casting shakeout machine, which comprises a fixed support 1, wherein the fixed support 1 comprises a rectangular frame 101, a first fixed seat 105 is installed at one corner inside the rectangular frame 101, second fixed seats 108 are installed at two adjacent sides inside the rectangular frame 101, and a casting fixing component 2 is installed inside the rectangular frame 101.

The casting fixing component 2 comprises a fixing box 201, symmetrical sliding rods 202 penetrate through the symmetrical two sides of the fixing box 201 in a sliding mode, clamping plates 204 are installed at one ends of the symmetrical sliding rods 202, symmetrical offset columns 206 are installed on the two adjacent sides of the fixing box 201, a vibrating plate 207 is installed on one side of each offset column 206, and a crushing component 3 is installed at the bottom end of the casting fixing component 2.

Broken subassembly 3 is including two sets of filter plates 301, skew board 302 is installed to filter plate 301 one side, vibrations subassembly 4 is installed to the inside one angle department of fixed bolster 1, vibrations subassembly 4 is including fixed frame 401, fixed frame 401 internally mounted has vibrations case 402, the second carriage release lever 421 of symmetry is installed to the both sides of vibrations case 402 symmetry, vibrations case 402 internally mounted has device case 403, the inside card of device case 403 is equipped with the first carriage release lever 416 of symmetry, the cover is equipped with the second spring 417 of symmetry on the first carriage release lever 416, the inside card of device case 403 is equipped with the axis of rotation 405 of symmetry, axis of rotation 405 both ends are all blocked and are equipped with eccentric block 407.

First spacing hole 102 has been seted up to the adjacent both sides lower extreme of rectangular frame 101, and inside first spacing hole 102 was located to skew board 302 slip card, supported and spacing filter plate 301, the spacing hole 103 of second has been seted up to the adjacent both sides upper end of rectangular frame 101, and inside the spacing hole 103 of second was located to the skew post 206 slip card of symmetry, supported and spacing fixed box 201.

First fixing base 105 internally mounted has first fixed axle 106, rotates the card on first fixed axle 106 and is equipped with the first spacing seat 107 of two sets of symmetries, and two sets of first spacing seats 107 are the right angle and distribute, and second fixing base 108 internally mounted has second fixed axle 109, and the card is equipped with first bearing 110 in second fixed axle 109 middle-end, and the spacing seat 111 of second is installed in the first bearing 110 outside, makes the spacing seat of first spacing seat 107 and second 111 can deflect. The filter plate 301 is installed to the inside bottom of fixed case 201, installs screw rod 203 between the slide bar 202 of symmetry, and screw rod 203 one end is rotated the card and is located with splint 204 one side center department, and a plurality of gag lever post 205 is installed to splint 204 opposite side, and the both sides of fixed case 201 symmetry are located to screw rod 203 screw thread card, and the screw rod 203 of one side slides and runs through rectangular frame 101, utilizes splint 204 and gag lever post 205 to fix the foundry goods.

Two sets of filter plates 301 contact each other, first spring 303 is all installed to the both sides of skew board 302 symmetry, first articulated seat 304 is installed to the first spring 303 other end, the card is equipped with fixed pin 306 on the first articulated seat 304, the card of fixed pin 306 both ends is equipped with the articulated seat 305 of second, the articulated seat 305 other end fixed mounting of second of symmetry is in the both sides of the inside symmetry of first spacing hole 102, utilize the tensile force and the elasticity of first spring 303 to make skew board 302 can reset. The other ends of the symmetrical first limiting seats 107 are fixedly connected with two adjacent sides of the fixed box 201 respectively, the two groups of second limiting seats 111 and the filter plates 301 are distributed up and down, and the second limiting seats 111 on the same layer are fixedly connected with one sides of the filter plates 301, so that the two groups of filter plates 301 can move oppositely to crush large-lump molding sand.

The fixed frame 401 is fixedly connected with the rectangular frame 101 through a support rod, a symmetrical second bearing 404 is clamped on the rotating shaft 405, the second bearing 404 is installed inside the device box 403, one side of the second bearing 404 is provided with a limit ring 406, the limit ring 406 is clamped on the rotating shaft 405, both sides of the eccentric block 407 are respectively clamped with a clamping ring 408, the clamping ring 408 is clamped on the rotating shaft 405, the rotating shaft 405 is clamped with a driven wheel 409, the driven wheel 409 is sleeved with a belt 410, the other end of the belt 410 is sleeved with a driving wheel 411, a driving shaft 412 is installed at the center of the symmetrical driving wheel 411, two groups of symmetrical third bearings 413 are clamped on the driving shaft 412, a supporting seat 414 is installed at the outer side of the third bearings 413, both ends of the supporting seat 414 are fixedly connected with the inner wall of the device box, one end of the driving shaft 412 is provided with a driving motor 415, the driving motor 415 is fixedly installed inside the device box 403, the eccentric blocks 407 at both ends of the symmetrical rotating shaft 405 are driven to rotate continuously by the driving motor 415, thereby causing the device case 403 and the vibration case 402 to constantly reciprocate. Eccentric blocks 407 clamped at two ends of the symmetrical rotating shaft 405 are mutually distributed at a right angle, so that the first moving rod 416 and the second moving rod 421 continuously compress a second spring 417, the first moving rod 416 slidably penetrates through the fixed frame 401 and the vibrating box 402, two ends of the symmetrical second spring 417 are respectively and fixedly connected with the inner side of the fixed frame 401, the outer side of the vibrating box 402, the inner side of the vibrating box 402 and the outer side of the device box 403, a second spring 417 is clamped on the second moving rod 421, and two ends of the second spring 417 are respectively and fixedly connected with the inner side of the fixed frame 401 and the outer side of the vibrating box 402.

The two ends of the symmetrical first moving rod 416 are both provided with moving seats 418, the bottom ends of the symmetrical moving seats 418 are provided with connecting plates 419, the bottom end of the symmetrical connecting plate 419 is provided with a moving plate 420, the other end of the second moving rod 421 is provided with a moving seat 418, the connecting plate 419 and the moving plate 420 are mounted at the bottom end of the symmetrical moving seat 418, the moving seat 418 at one end of the first moving rod 416 and the second moving rod 421 can contact with one side of the vibration plate 207, the fixed box 201 can vibrate continuously by using the moving seat 418 to contact with the vibration plate 207, two groups of sliding holes 104 are further formed in the rectangular frame 101, the moving seat 418 at the other end of the first moving rod 416 and the second moving rod 421 can penetrate through the sliding holes 104, one end of the moving plate 420 below the first moving rod 416 and the second moving rod 421 can contact with one side of the offset plate 302, and the moving plate 420 can contact with the offset plate 302, so that the filter plate 301 can deflect continuously.

When the casting mold fixing device works, a casting with molding sand in the casting box is placed in the fixing box 201, the two groups of screw rods 203 are rotated, the symmetrical clamping plates 204 move oppositely along the sliding rod 202, the casting is fixedly clamped by the symmetrical clamping plates 204 and the limiting rods 205 on the side faces of the symmetrical clamping plates 204, at the moment, the driving motor 415 is started, the driving motor 415 rotates to drive the driving shaft 412 to rotate, and the driving shaft 412 rotates to drive the two groups of driving wheels 411 to rotate; the driving wheel 411 drives the driven wheel 409 to rotate by the belt 410, the driven wheel 409 drives the symmetrical eccentric blocks 407 to rotate by the rotation, and the two groups of symmetrical eccentric blocks 407 which are distributed at right angles rotate at the same time, so that the device box 403 can deflect continuously.

When the device box 403 deflects, the first movable rod 416 and the second movable rod 421 are driven to continuously compress the second spring 417, so that the movable seat 418 at one end of the first movable rod 416 and the movable seat 418 at one end of the second movable rod 421 respectively reciprocate longitudinally and transversely, and the movable seats 418 can contact with the vibration plates 207 at two adjacent sides of the fixed box 201 and impact the vibration plates 207. When the vibration plate 207 is impacted, the fixing box 201 is driven to deflect around the first fixing shaft 106 continuously, so that the molding sand on the casting inside the fixing box 201 can fall off from the casting.

When the molding sand falls, the movable plate 420 installed below the movable seats 418 at the two ends of the first movable rod 416 and the movable seats 418 at the ends of the symmetrical second movable rods 421 continuously reciprocates and impacts the side surface of the offset plate 302, so that the filter plate 301 connected with the offset plate 302 deflects around the second fixed shaft 109, the offset plate 302 is reset by the tensile force and the elastic force of the symmetrical first springs 303, and the large lumps of molding sand falling from the fixed box 201 are crushed by the continuous movement of the two sets of filter plates 301 reciprocating in different directions.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.