阅读说明：本技术 一种冷敷贴精华液加工用快速混合装置 (Quick mixing device is used in processing of cold compress subsides essence ) 是由 陆克龙 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种冷敷贴精华液加工用快速混合装置,涉及机械加工技术领域。包括混合箱,所述混合箱内设置有混合机构,所述混合机构包括动力电机、进料口、动力轴、搅动环、轴承和固定轴,所述动力电机嵌固于混合箱顶部,所述进料口嵌固于混合箱外壁上,所述动力轴顶部嵌固于动力电机的输出端,所述搅动环嵌固于动力轴外壁上,所述动力轴底部嵌固于轴承顶部外壁上。该冷敷贴精华液加工用快速混合装置,通过在混合箱内设置有搅动机构,利用磁极异性相吸的作用来将中心的精华液向外部推动,使得混合更加充分,同时通过活性炭吸附球跟随转动进行吸附刺激性气味,来保证混合的环境良好,能够有效的提高工作人员的工作效率。(The invention discloses a rapid mixing device for processing cold compress essence, and relates to the technical field of machining. Including the mixing box, be provided with mixing mechanism in the mixing box, mixing mechanism includes motor power, feed inlet, power shaft, stirring ring, bearing and fixed axle, motor power inlays admittedly in the mixing box top, the feed inlet inlays admittedly on the mixing box outer wall, the power shaft top inlays admittedly in motor power's output, the stirring ring inlays admittedly on the power shaft outer wall, the power shaft bottom inlays admittedly on bearing top outer wall. This quick mixing device is used in cold compress essence processing through being provided with rabbling mechanism in the mixing box, utilizes the effect that magnetic pole opposite poles attract to promote the essence at center to outside for mix more fully, follow the rotation through activated carbon adsorption ball simultaneously and adsorb pungent smell, guarantee that the environment of mixing is good, can effectual improvement staff's work efficiency.)

1. The utility model provides a quick mixing arrangement is used in processing of cold compress subsides essence, includes mixing box (1), its characterized in that: be provided with mixing mechanism in mixing box (1), mixing mechanism includes motor power (21), feed inlet (22), power shaft (23), stirring ring (24), bearing (25) and fixed axle (26), motor power (21) builds in mixing box (1) top, feed inlet (22) builds in on mixing box (1) outer wall, power shaft (23) top builds in the output of motor power (21), stir ring (24) and build in on power shaft (23) outer wall, power shaft (23) bottom builds in on bearing (25) top outer wall, bearing (25) bottom inner wall builds in fixed axle (26) top, fixed axle (26) bottom builds in on mixing box (1) bottom inner wall.

2. The rapid mixing device for processing of cold compress essence according to claim 1, wherein: be provided with stirring mechanism on stirring ring (24), stirring mechanism includes magnet piece (31), slide bar (32) and stirring piece (33), magnet piece (31) are inlayed and are fixed in slide bar (32) top, slide bar (32) run through and slidable mounting on stirring ring (24), slide bar (32) bottom is inlayed inherently and is stirred piece (33).

3. The rapid mixing device for processing of cold compress essence according to claim 1, wherein: be provided with pushing mechanism on fixed axle (26) outer wall, pushing mechanism includes No. two magnet piece (41), axis of rotation (42), arc commentaries on classics board (43) and arc push pedal (44), No. two magnet piece (41) are inlayed on fixed axle (26) outer wall, No. two magnet piece (41) right-hand member magnetic pole is different with a magnet piece (31) top magnetic pole, axis of rotation (42) are rotated and are installed on No. two magnet piece (41), arc commentaries on classics board (43) top and arc push pedal (44) bottom are all inlayed admittedly on axis of rotation (42) outer wall.

4. The rapid mixing device for processing of cold compress essence according to claim 2, characterized in that: be provided with complementary unit on stirring piece (33), complementary unit includes slide (51), No. two slide (52), No. two slide bars (53) and supplementary ring (54), slide (51) run through and slidable mounting on stirring piece (33), slide (51) bottom inlays admittedly on No. two slide (52) outer walls, No. two slide (52) slidable mounting is on stirring piece (33) inner wall, through shell fragment elastic connection between No. two slide (52) bottom and the stirring piece (33) inner wall, No. two slide bar (53) top is rotated and is installed on No. two slide (52), No. two slide bar (53) bottom inlays admittedly on supplementary ring (54), No. two slide bar (53) and stirring piece (33) bottom swing joint.

5. The rapid mixing device for processing of cold compress essence according to claim 4, wherein: it has bracing piece (6) to inlay on supplementary ring (54) inner wall, it has activated carbon adsorption ball (7) to inlay on bracing piece (6), activated carbon adsorption ball (7) outside is provided with vibration mechanism, vibration mechanism includes arch (81), rotation post (82) and dwang (83), arch (81) are inlayed and are consolidated on activated carbon adsorption ball (7) outer wall, rotation post (82) are rotated and are installed on supplementary ring (54), dwang (83) are inlayed and are consolidated on rotation post (82) and dwang (83) short right side in a left side is long.

6. The rapid mixing device for processing of cold compress essence according to claim 5, wherein: supplementary ring (54) bottom is provided with beats the mechanism, beat the mechanism including beating pole (91), No. three slide (92), arc rotating plate (93) and clean brush (94), beat pole (91) and inlay admittedly in supplementary ring (54) bottom, No. three slide (92) slidable mounting is on beating pole (91) outer wall, pass through shell fragment elastic connection between No. three slide (92) top and bracing piece (6).

7. The rapid mixing device for processing of cold compress essence according to claim 6, wherein: the top of the arc-shaped rotating plate (93) is rotatably installed at the bottom of the third sliding plate (92), the cleaning brush (94) is fixedly embedded on the outer wall of the arc-shaped rotating plate (93), and the bottom of the cleaning brush (94) is movably connected with the top of the telescopic triangular plate (12).

8. The rapid mixing device for processing of cold compress essence according to claim 7, wherein: the bottom of the telescopic triangular plate (12) is slidably mounted on the inner wall of the bottom of the mixing box (1), the included angles of the telescopic triangular plate (12) are elastically connected through elastic pieces, the right end of the telescopic triangular plate (12) is fixedly embedded at the bottom of the pull plate (10), the pull plate (10) is fixedly embedded at the right end of the connecting plate (11), and the left end of the connecting plate (11) is rotatably mounted on the outer wall of the stirring block (33).

Technical Field

The invention relates to the technical field of machining, in particular to a quick mixing device for processing cold compress essence.

Background

The cold application patch can contract local capillary vessel, relieve local congestion, reduce sensitivity of nerve ending to relieve pain, lower temperature, defervesce, reduce local blood flow, and prevent inflammation and suppuration diffusion. Can dissipate heat conduction in vivo, increase heat dissipation, and lower body temperature. The cold compress is suitable for people who need cold compress, such as early local software tissue damage, patients with high fever, heatstroke, toothache and the like.

Among the prior art, in the preparation process of cold application, need carry out the mixing operation to the essence of cold application, but carry out the in-process that mixes at current mixing arrangement, the essence of mixing arrangement center department is because being in the rotating-state always, is difficult to obtain abundant mixture to the essence mixing rate that leads to center department is slower, thereby has reduced holistic mixing efficiency, influences staff's work efficiency.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a rapid mixing device for processing cold compress essence, which solves the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a rapid mixing device is used in processing of cold compress subsides essence, includes the mixing box, be provided with mixing mechanism in the mixing box, mixing mechanism includes motor power, feed inlet, power shaft, stirring ring, bearing and fixed axle, motor power inlays admittedly in the mixing box top, the feed inlet inlays admittedly on the mixing box outer wall, the power shaft top inlays admittedly in motor power's output, the stirring ring inlays admittedly on the power shaft outer wall, the power shaft bottom inlays admittedly on bearing top outer wall, bearing bottom inner wall inlays admittedly in the fixed axle top, the fixed axle bottom inlays admittedly on mixing box bottom inner wall.

Preferably, be provided with rabbling mechanism on the stirring ring, rabbling mechanism includes magnet piece, slide bar and stirring piece No. one, magnet piece inlays admittedly in slide bar top No. one, a slide bar runs through and slidable mounting on the stirring ring, the inherent stirring piece of slide bar bottom inlay.

Preferably, be provided with pushing mechanism on the fixed axle outer wall, pushing mechanism includes No. two magnet pieces, axis of rotation, arc commentaries on classics board and arc push pedal, No. two magnet pieces inlay admittedly on the fixed axle outer wall, No. two magnet piece right-hand member magnetic poles are different with a magnet piece top magnetic pole, the axis of rotation is rotated and is installed on No. two magnet pieces, arc commentaries on classics board top and arc push pedal bottom all inlay admittedly on the axis of rotation outer wall.

Preferably, be provided with complementary unit on the stirring piece, complementary unit includes slide, No. two slides, No. two slide bars and supplementary rings, slide runs through and slidable mounting on the stirring piece, slide bottom inlays admittedly on No. two slide outer walls, No. two slide slidable mounting is on stirring piece inner wall, pass through shell fragment elastic connection between No. two slide bottoms and the stirring piece inner wall, No. two slide bar tops are rotated and are installed on No. two slides, No. two slide bar bottoms are inlayed admittedly on supplementary rings, No. two slide bars and stirring piece bottom swing joint.

Preferably, the bracing piece has been inlayed on the supplementary ring inner wall admittedly, it has the activated carbon adsorption ball to inlay on the bracing piece, activated carbon adsorption ball outside is provided with vibration mechanism, vibration mechanism includes arch, rotation post and dwang, the arch is inlayed admittedly on activated carbon adsorption ball outer wall, the rotation post rotates and installs on supplementary ring, the dwang is inlayed admittedly on the rotation post and the dwang left and right sides is short long.

Preferably, supplementary ring bottom is provided with beats the mechanism, beat the mechanism including beating pole, No. three slides, arc rotor plate and clean brush, beat the pole and inlay admittedly in supplementary ring bottom, No. three slide slidable mounting are on beating the pole outer wall, pass through shell fragment elastic connection between No. three slide tops and the bracing piece.

Preferably, the top of the arc-shaped rotating plate is rotatably installed at the bottom of the third sliding plate, the cleaning hairbrush is fixedly embedded on the outer wall of the arc-shaped rotating plate, and the bottom of the cleaning hairbrush is movably connected with the top of the telescopic triangular plate.

Preferably, the bottom of the telescopic triangular plate is slidably mounted on the inner wall of the bottom of the mixing box, the included angles of the telescopic triangular plate are elastically connected through elastic pieces, the right end of the telescopic triangular plate is fixedly embedded at the bottom of the pull plate, the pull plate is fixedly embedded at the right end of the connecting plate, and the left end of the connecting plate is rotatably mounted on the outer wall of the stirring block.

(III) advantageous effects

The invention provides a rapid mixing device for processing cold compress essence. The method has the following beneficial effects:

(1) this rapid mixing device is used in processing of cold compress subsides essence, through be provided with mixing mechanism and rabbling mechanism in the mixing box, when driving rabbling mechanism through mixing mechanism and rotating, rabbling mechanism's stirring piece is driven and is rotated when No. two magnet piece departments, because a magnet piece top magnetic pole is different with No. two magnet piece right-hand member magnetic poles, thereby produce the effect that opposite sex was inhaled mutually, make a magnet piece upwards inhaled, a magnet piece alright drive a slide bar and stir the piece and to stirring intra-annular removal, a magnet piece alright to the driving force of arc revolving plate, make the arc revolving plate can drive the axis of rotation and carry out clockwise rotation, make the arc pushing plate can promote the essence of center department to the outside, thereby promote the mixed absorption of essence, and the efficiency of mixing is improved.

(2) This cold compress pastes flash mixed device for essence processing, through be provided with complementary unit on the stirring piece, when the stirring piece because the effect of magnetism is inhaled and centrifugal force is when carrying out reciprocating motion, can promote No. two slides through a slide and carry out reciprocating motion, make No. two slides can drive No. two slide bars and carry out reciprocating motion from top to bottom, No. two slide bars alright drive supplementary ring and carry out reciprocating motion when following stirring ring pivoted, make the inside active carbon adsorption ball of supplementary ring absorb the pungent smell that produces when mixing the essence, staff's work efficiency has been improved.

(3) This cold compress pastes flash mixed device for essence processing, when supplementary ring follows the stirring ring and rotates, dwang on the supplementary ring can rotate because the thrust when essence stirs, thereby drive the rotation post and rotate, because the dwang left side is short long on the right side, when the longer part of dwang right-hand member rotates to the left end, the dwang alright produce an impact to the arch, make the arch produce the vibration, the arch alright drive the active carbon adsorption ball and vibrate together, thereby promote the absorption of active carbon adsorption ball and get rid of the remaining essence impurity in surface.

(4) This quick mixing device is used in cold compress essence processing, when supplementary ring was carried out reciprocating periodic motion about by No. two slide bars drives, supplementary ring also can follow the stirring ring and rotate, and the pole of beating of supplementary ring alright follow and move together this moment to beat the operation to the inside essence of mixing box, prevent that the essence from solidifying into a mass and improving holistic stirring mixing efficiency simultaneously.

(5) This rapid mixing device is used in essence processing is pasted in cold compress, when stirring the piece and follow a slide bar and carry out reciprocal periodic motion, the stirring piece also can drive the arm-tie through the connecting plate and remove about, reciprocating flexible about the arm-tie alright drive flexible set square goes on, when flexible set square shrink upwards jacks up, can stir impurity such as remaining essence on the inner wall of mixing box bottom, prevent to deposit, the reciprocating motion of supplementary ring also can drive the clean brush on the arc rotor plate and carry out cleaning operation to the surface of flexible set square simultaneously, improve the life of flexible set square.

Drawings

FIG. 1 is a schematic view of the overall external three-dimensional structure of the present invention;

FIG. 2 is a schematic view of the overall internal structure of the present invention;

FIG. 3 is a schematic view of the external three-dimensional structure of the agitating ring of the present invention;

FIG. 4 is a schematic view of a partial three-dimensional structure inside the stirring block according to the present invention;

FIG. 5 is a schematic view of the external three-dimensional structure of the arc-shaped rotating plate according to the present invention;

FIG. 6 is a schematic diagram of the external three-dimensional structure of the retractable triangle of the present invention.

In the figure: 1. a mixing box; 21. a power motor; 22. a feed inlet; 23. a power shaft; 24. a stirring ring; 25. a bearing; 26. a fixed shaft; 31. a first magnet block; 32. a first sliding rod; 33. stirring blocks; 41. a second magnet block; 42. a rotating shaft; 43. an arc-shaped rotating plate; 44. an arc-shaped push plate; 51. a first slide plate; 52. a second sliding plate; 53. a second sliding rod; 54. an auxiliary ring; 6. a support bar; 7. activated carbon adsorption balls; 81. a protrusion; 82. rotating the column; 83. rotating the rod; 91. hammering the rod; 92. a third sliding plate; 93. an arc rotating plate; 94. cleaning the brush; 10. pulling a plate; 11. a connecting plate; 12. a telescopic triangle.

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.

Referring to fig. 1-6, the present invention provides a technical solution: a rapid mixing device for processing cold compress essence comprises a mixing box 1, wherein a mixing mechanism is arranged in the mixing box 1, the mixing mechanism comprises a power motor 21, a feed inlet 22, a power shaft 23, a stirring ring 24, a bearing 25 and a fixed shaft 26, the power motor 21 is embedded at the top of the mixing box 1, the feed inlet 22 is embedded on the outer wall of the mixing box 1, the top of the power shaft 23 is embedded at the output end of the power motor 21, the stirring ring 24 is embedded on the outer wall of the power shaft 23, the bottom of the power shaft 23 is embedded on the outer wall of the top of the bearing 25, the inner wall of the bottom of the bearing 25 is embedded on the top of the fixed shaft 26, the bottom of the fixed shaft 26 is embedded on the inner wall of the bottom of the mixing box 1, the stirring ring 24 is provided with a stirring mechanism, the stirring mechanism comprises a magnet block 31, a sliding rod 32 and a stirring block 33, the magnet block 31 is embedded on the top of the sliding rod 32, the sliding rod 32 penetrates through and is slidably mounted on the stirring ring 24, the bottom of the first sliding rod 32 is embedded with the inherent stirring block 33, the outer wall of the fixed shaft 26 is provided with the pushing mechanism, the pushing mechanism comprises a second magnet block 41, a rotating shaft 42, an arc-shaped rotating plate 43 and an arc-shaped push plate 44, the second magnet block 41 is embedded and fixed on the outer wall of the fixed shaft 26, the magnetic pole at the right end of the second magnet block 41 is different from the magnetic pole at the top of the first magnet block 31, the rotating shaft 42 is rotatably arranged on the second magnet block 41, the top of the arc-shaped rotating plate 43 and the bottom of the arc-shaped push plate 44 are both embedded and fixed on the outer wall of the rotating shaft 42, through the mixing mechanism and the stirring mechanism arranged in the mixing box 1, as the magnetic pole at the top of the first magnet block 31 is different from the magnetic pole at the right end of the second magnet block 41, the opposite attraction effect is generated, the first magnet block 31 can drive the arc-shaped rotating plate 43, the arc-shaped rotating plate 43 can drive the rotating shaft 42 to rotate clockwise, and the arc-shaped push plate 44 can push the essence liquid at the center to the outside, thereby promoting the mixing absorption of the essence and improving the mixing efficiency.

As shown in fig. 3 and 4, in the present invention, an auxiliary mechanism is disposed on the stirring block 33, the auxiliary mechanism includes a first sliding plate 51, a second sliding plate 52, a second sliding rod 53 and an auxiliary ring 54, the first sliding plate 51 penetrates and is slidably mounted on the stirring block 33, the bottom of the first sliding plate 51 is embedded and fixed on the outer wall of the second sliding plate 52, the second sliding plate 52 is slidably mounted on the inner wall of the stirring block 33, the bottom of the second sliding plate 52 is elastically connected with the inner wall of the stirring block 33 through a spring plate, the top of the second sliding rod 53 is rotatably mounted on the second sliding plate 52, the bottom of the second sliding rod 53 is embedded and fixed on the auxiliary ring 54, the second sliding rod 53 is movably connected with the bottom of the stirring block 33, a support rod 6 is embedded and fixed on the inner wall of the auxiliary ring 54, an activated carbon adsorption ball 7 is embedded and fixed on the support rod 6, a vibration mechanism is disposed outside the activated carbon adsorption ball 7, the vibration mechanism includes a protrusion rotating rod 81, rotating columns 82 and 83, protruding 81 inlays on activated carbon adsorption ball 7 outer wall, it installs on supplementary ring 54 to rotate post 82, dwang 83 inlays on rotating post 82 and dwang 83 short left right side is long, through be provided with complementary unit on stirring piece 33, when stirring piece 33 carries out reciprocating motion owing to the effect of magnetism and centrifugal force, can promote No. two slide 52 through slide 51 and carry out reciprocating motion, make No. two slide 52 can drive No. two slide 53 and carry out reciprocal periodic motion from top to bottom, No. two slide 53 alright drive supplementary ring 54 carries out reciprocating motion when following stirring ring 24 pivoted, make inside activated carbon adsorption ball 7 of supplementary ring 54 can absorb the irritability smell that produces when mixing, staff's work efficiency has been improved.

As shown in fig. 2, 4, 5 and 6, in the present invention, a beating mechanism is disposed at the bottom of the auxiliary ring 54, the beating mechanism includes a beating rod 91, a third sliding plate 92, an arc-shaped rotating plate 93 and a cleaning brush 94, the beating rod 91 is embedded at the bottom of the auxiliary ring 54, the third sliding plate 92 is slidably mounted on the outer wall of the beating rod 91, the top of the third sliding plate 92 is elastically connected with the support rod 6 through a spring plate, the top of the arc-shaped rotating plate 93 is rotatably mounted at the bottom of the third sliding plate 92, the cleaning brush 94 is embedded on the outer wall of the arc-shaped rotating plate 93, the bottom of the cleaning brush 94 is movably connected with the top of the triangle 12, the bottom of the triangle 12 is slidably mounted on the inner wall at the bottom of the mixing box 1, the included angle between the triangle 12 is elastically connected through a spring plate, the right end of the triangle 12 is embedded at the bottom of the pull plate 10, the pull plate 10 is embedded at the right end of the connecting plate 11, the left end of the connecting plate 11 is rotatably mounted on the outer wall of the stirring block 33, when supplementary ring 54 was driven by No. two slide bars 53 and is carried out reciprocating cycle motion from top to bottom, supplementary ring 54 also can be followed and stir ring 24 and rotate, and the pole 91 of beating of supplementary ring 54 alright follow and move together this moment to beat the operation to the inside essence of mixing box 1, prevent that the essence from solidifying into mass and improving holistic stirring mixing efficiency simultaneously.

When the mixing box is in work (or in use), the mixing mechanism and the stirring mechanism are arranged in the mixing box 1, when the stirring mechanism is driven to rotate by the mixing mechanism, and the stirring block 33 of the stirring mechanism is driven to rotate to the position of the second magnet block 41, because the magnetic pole at the top of the first magnet block 31 is different from the magnetic pole at the right end of the second magnet block 41, the opposite attraction effect is generated, so that the first magnet block 31 is sucked upwards, the first magnet block 31 can drive the first slide rod 32 and the stirring block 33 to move towards the inside of the stirring ring 24, the first magnet block 31 can drive the arc-shaped rotating plate 43, the arc-shaped rotating plate 43 can drive the rotating shaft 42 to rotate clockwise, the arc-shaped push plate 44 can push essence at the center to the outside, the mixing absorption of the essence is promoted, and the mixing efficiency is improved; through the arrangement of the auxiliary mechanism on the stirring block 33, when the stirring block 33 performs reciprocating motion due to the action of magnetic attraction and centrifugal force, the first sliding plate 51 can push the second sliding plate 52 to perform reciprocating motion, so that the second sliding plate 52 can drive the second sliding rod 53 to perform vertical reciprocating periodic motion, the second sliding rod 53 can drive the auxiliary circular ring 54 to perform reciprocating motion while rotating along with the stirring ring 24, so that the activated carbon adsorption balls 7 in the auxiliary circular ring 54 can absorb pungent smell generated when essence is mixed, the working efficiency of workers is improved, when the auxiliary circular ring 54 rotates along with the stirring ring 24, the rotating rod 83 on the auxiliary circular ring 54 can rotate due to the thrust generated when the essence is stirred, thereby driving the rotating column 82 to rotate, because the rotating rod 83 is short at the left and long at the right, when the longer part of the rotating rod 83 rotates to the left end, the rotating rod 83 can generate an impact force on the protrusion 81, so that the protrusion 81 can vibrate, and the protrusion 81 can drive the activated carbon adsorption ball 7 to vibrate together, thereby promoting the activated carbon adsorption ball 7 to absorb and remove the residual essence impurities on the surface; when the auxiliary ring 54 is driven by the second sliding rod 53 to do up-and-down reciprocating periodic motion, the auxiliary ring 54 can also rotate along with the stirring ring 24, and the beating rod 91 of the auxiliary ring 54 can move along with the auxiliary ring, so that the essence in the mixing box 1 is beaten, the essence is prevented from being coagulated into lumps, and the whole stirring and mixing efficiency is improved; when the stirring block 33 moves back and forth periodically along with the first sliding rod 32, the stirring block 33 can drive the pulling plate 10 to move left and right through the connecting plate 11, the pulling plate 10 can drive the telescopic triangle 12 to extend back and forth left and right, when the telescopic triangle 12 is retracted and lifted up, impurities such as essence and the like remained on the inner wall of the bottom of the mixing box 1 can be stirred to prevent precipitation, meanwhile, the reciprocating motion of the auxiliary ring 54 can drive the cleaning brush 94 on the arc-shaped rotating plate 93 to clean the surface of the telescopic triangle 12, so as to prolong the service life of the telescopic triangle 12, in conclusion, by arranging the stirring mechanism in the mixing box 1, the essence at the center is pushed outwards by the action of opposite attraction of magnetic poles, so that the mixing is more sufficient, and simultaneously, the activated carbon adsorption balls 7 rotate along with the rotation to adsorb pungent odor, so as to ensure good mixed environment, the working efficiency of the working personnel can be effectively improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.