Disclosure of Invention
The invention aims to provide a mounting device of a voltage stabilizer, which has the advantages that the mounting device is suitable for fixing voltage stabilizers with different lengths, and can realize quick mounting and dismounting of the voltage stabilizer.
The purpose of the invention is realized by the following technical scheme:
an installation device of a voltage stabilizer comprises a fixed underframe, a position adjusting device, an installation base, an installation clamping piece, a disassembly control piece, a width adjusting piece and a voltage stabilizer body, position control device establish in fixed chassis, installation base and installation screens piece all are equipped with two, two installation base symmetry swing joint are on position control device, width regulation piece is on position control device, width regulation piece's both ends are connected with two installation bases respectively, two installation screens piece symmetry swing joint are on two installation bases, two installation screens piece are connected with the both ends of dismantling the control piece respectively, it establishes on width regulation piece to dismantle the control piece, the both ends of dismantling the control piece respectively with two installation base swing joint, the both ends of stabiliser body lower extreme are equipped with a card arris groove respectively, two installation screens piece difference joint are in two card arris grooves on the stabiliser body.
As a further optimization of the technical scheme, the mounting device of the voltage stabilizer is characterized in that a right-angle frame plate, a side through groove and a screw inserting plate are arranged on the fixed underframe; the fixed underframe is symmetrically and fixedly connected with two right-angle frame plates, the two right-angle frame plates are respectively provided with a side through groove, and the front end and the rear end of the fixed underframe are respectively and fixedly connected with two screw inserting plates; the position adjusting device is connected with the two side through grooves in a matched mode.
As further optimization of the technical scheme, the mounting device of the voltage stabilizer comprises a position adjusting device, a positioning device and a control device, wherein the position adjusting device comprises a side sliding seat, a cross beam, a trapezoidal rod, a side sliding groove, an ear plate, an inserting plate, a sliding sleeve and a first lead screw; two crossbeams around fixed connection between two side slides about, trapezoidal pole of difference fixed connection on two crossbeams, two mount pads are connected with two trapezoidal poles respectively, be equipped with a side spout on two crossbeams respectively, width adjusting part is connected with two side spout cooperations, otic placode of outer end difference fixed connection of two side slides, two side spouts sliding fit connection respectively are in two right angle frame boards, two otic placodes sliding fit connection respectively are at two side logical inslots, a picture peg of fixed connection respectively on two otic placodes, two picture pegs sliding fit connection respectively is in two slide covers, two slide covers fixed connection respectively is on two right angle frame boards, two slide covers are connected respectively on two first lead screws through screw-thread fit, two first lead screws rotate the outer end of connecting at two otic placodes respectively.
As a further optimization of the technical scheme, the mounting device of the voltage stabilizer comprises a mounting base, a connecting rod and a connecting rod, wherein the mounting base comprises a right-angle plate, a convex plate, a spring seat, a hinged seat, a convex block and a guide rod; the right-angle plate is connected with one end of the front trapezoidal rod and the rear trapezoidal rod in a sliding fit manner, the inner end of the right-angle plate is fixedly connected with the convex plate, the convex plate is fixedly connected with two spring seats, the outer end of the right-angle plate is fixedly connected with the hinged seat, the width adjusting piece is connected with the hinged seat, and the mounting clamping piece is connected with the spring seats in a fit manner; the guide rod is fixedly connected to the front end of the inner end of the right-angle plate through a bump, and the disassembly control piece is connected with the guide rod in a matched mode.
As a further optimization of the technical scheme, the mounting device of the voltage stabilizer comprises a mounting clamping piece, a clamping piece and a spring, wherein the mounting clamping piece comprises a sliding plate, a clamping edge, a spring rod and a compression spring; the outer end of the sliding plate is fixedly connected with the clamping edge, and the inner end of the sliding plate is fixedly connected with the two spring rods; the spring rod is connected to the spring seat in a sliding fit manner; the spring rod is sleeved with a compression spring; two ends of the compression spring are respectively and fixedly connected with the sliding plate and the spring seat; the front end of the sliding plate is connected with the disassembling control piece; the clamping edge is clamped in the clamping edge groove.
As a further optimization of the technical scheme, the mounting device of the voltage stabilizer comprises a dismounting control piece, a fixing clamping plate, a sliding block, a pull rod, a screw rod frame, a side sliding frame, an I-shaped sliding block, an L-shaped bottom frame and an articulated arm, wherein the dismounting control piece comprises a fixing clamping plate, a sliding block, a pull rod, a screw rod frame, a side sliding frame, an I-shaped sliding block, an L-shaped bottom frame and an articulated arm; the fixed splint is fixedly connected to the width adjusting piece, the sliding block is connected to the fixed splint in a sliding fit mode, the pull rod is fixedly connected to the sliding block, the pull rod is connected to the screw rod frame in a sliding fit mode, the screw rod frame is fixedly connected to the fixed splint, two ends of the sliding block are fixedly connected to one side sliding frame respectively, the two I-shaped sliding blocks are connected to the two side sliding frames in a sliding fit mode respectively, the lower ends of the two I-shaped sliding blocks are fixedly connected to one L-shaped underframe respectively, the two L-shaped underframe are connected to guide rods on the two installation bases in a sliding fit mode respectively, the upper ends of the two I-shaped sliding blocks are connected to one hinged arm respectively in a rotating mode, and the two hinged arms are connected to the front ends of sliding plates on the two installation clamping pieces respectively in a rotating mode.
As a further optimization of the technical scheme, the mounting device of the voltage stabilizer comprises a width adjusting part, a front frame plate, a worm, a gear, a rack, a second lead screw, a worm wheel, a third lead screw, a lead screw seat, a groove block and a hinge rod, wherein the width adjusting part comprises a front frame plate, a worm, a gear, a rack, a second lead screw, a worm wheel, a third lead screw, a lead screw seat, a groove block and a hinge rod; the front frame plate is fixedly connected to a cross beam at the front end, the worm is rotatably connected to the front frame plate, the gear is fixedly connected to the middle of the front frame plate, the rack is in meshed transmission connection with the gear, the rack is in sliding fit connection with the front end of the front frame plate, the rack is in threaded fit connection with the second lead screw, the second lead screw is rotatably connected to the front frame plate, two ends of the second lead screw are respectively in meshed transmission connection with two worm gears, the two worm gears are respectively fixedly connected to two third lead screws, the two third lead screws are respectively in rotating connection with two lead screw seats, the two lead screw seats are respectively and fixedly connected to two side sliding seats, the two groove blocks are respectively in threaded fit connection with the two third lead screws, the two groove blocks are respectively in sliding fit connection with two side sliding grooves, the upper ends of the two groove blocks are respectively and rotatably connected to a hinge rod, and the two hinge rods are respectively and rotatably connected to the outer ends of right-angle plates on the two mounting bases; the fixed splint is fixedly connected on the front frame plate.
As a further optimization of the technical solution, in the mounting device of the voltage stabilizer, the outer end surface of the clamping edge is inclined downward from inside to outside.
The mounting device of the voltage stabilizer has the beneficial effects that:
the mounting device of the voltage stabilizer is suitable for fixing voltage stabilizers with different lengths, and can realize quick mounting and dismounting of the voltage stabilizer. When the voltage stabilizer body is abutted to the two mounting bases, the two mounting clamping pieces can be automatically clamped in the clamping edge grooves, the mounting of the voltage stabilizer body can be quickly and conveniently realized, when the voltage stabilizer body is dismounted, only the pull rod needs to be pulled forwards to enable the two mounting clamping pieces to contract inwards to be separated from the clamping edge grooves, the voltage stabilizer body can be quickly dismounted, the mounting and dismounting of the voltage stabilizer body can be quickly realized, and meanwhile, the distance between the two mounting clamping pieces can be changed by adjusting the width adjusting piece, so that the voltage stabilizer bodies with different lengths can be mounted; the position of the voltage stabilizer body can be adjusted by adjusting the position adjusting device; let two installation screens piece in opposite directions or deviate from the slip simultaneously through adjusting width adjustment spare for after the distance between two installation screens pieces changes, install the stabiliser body on two installation screens pieces and be in the position in the middle of the centre of fixed chassis all the time, the skew can not take place for the position of stabiliser body.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the electrical components that appear in this application all external intercommunication power and control switch when using.
The invention is described in further detail below with reference to figures 1-8 and the detailed description.
The first embodiment is as follows:
the embodiment is described below with reference to fig. 1-8, a mounting device for a voltage stabilizer, comprising a fixed chassis 1, a position adjusting device 2, mounting bases 3, mounting clamping members 4, a dismounting control member 5, a width adjusting member 6 and a voltage stabilizer body 7, wherein the position adjusting device 2 is arranged in the fixed chassis 1, two mounting bases 3 and two mounting clamping members 4 are arranged, the two mounting bases 3 are symmetrically and movably connected to the position adjusting device 2, the width adjusting member 6 is arranged on the position adjusting device 2, two ends of the width adjusting member 6 are respectively connected to the two mounting bases 3, the two mounting clamping members 4 are symmetrically and movably connected to the two mounting bases 3, the two mounting clamping members 4 are respectively connected to two ends of the dismounting control member 5, the dismounting control member 5 is arranged on the width adjusting member 6, two ends of the dismounting control member 5 are respectively and movably connected to the two mounting bases 3, two ends of the lower end of the voltage stabilizer body 7 are respectively provided with a clamping edge groove 7-1, and the two installation clamping parts 4 are respectively clamped in the two clamping edge grooves 7-1 on the voltage stabilizer body 7. When in use, the lower end of the voltage stabilizer body 7 is aligned with the two mounting clamping pieces 4, the voltage stabilizer body 7 is pressed downwards or the voltage stabilizer body 7 can move downwards under the action of self gravity to extrude the two mounting clamping pieces 4 to draw close inwards, when the bottom surface of the voltage stabilizer body 7 is abutted against the two mounting bases 3, the two mounting clamping pieces 4 can be automatically clamped in the clamping edge groove 7-1, the mounting of the voltage stabilizer body 7 can be realized quickly and conveniently, when the voltage stabilizer body 7 is dismounted, the control piece 5 only needs to be pulled forwards to lead the two mounting clamping pieces 4 to contract inwards to be separated from the clamping edge groove 7-1, the voltage stabilizer body 7 can be dismounted, the mounting and dismounting of the voltage stabilizer body 7 can be realized quickly, the distance between the two mounting bases 3 can be changed by adjusting the width adjusting piece 6, the two mounting bases 3 drive the distance between the two mounting clamping pieces 4 to change, and then can install the stabiliser body 7 of different length, can adjust stabiliser body 7 front and back position through adjusting position adjusting device 2, let two installation screens 4 slide in opposite directions or deviate from simultaneously through width control spare 6 for install stabiliser body 7 on two installation screens 4 and be in the position in the middle of fixed chassis 1 all the time, thereby make the distance between two installation screens 4 change the back, the skew can not take place for stabiliser body 7's position.
The second embodiment is as follows:
the embodiment is described below with reference to fig. 1 to 8, and the fixed underframe 1 is provided with a right-angle frame plate 1-1, a side through groove 1-2 and a screw inserting plate 1-3; two right-angle frame plates 1-1 are symmetrically and fixedly connected to the fixed underframe 1, a side through groove 1-2 is respectively arranged on each of the two right-angle frame plates 1-1, and two screw inserting plates 1-3 are respectively and fixedly connected to the front end and the rear end of the fixed underframe 1; the position adjusting device 2 is connected with the two side through grooves 1-2 in a matched mode. When the voltage stabilizer is used, the fixed underframe 1 is fixed at a specified position by inserting the positioning screws into the four screw inserting plates 1-3, and the position adjusting device 2 can move back and forth on the fixed underframe 1 so as to adjust the front and back positions of the voltage stabilizer body 7.
The third concrete implementation mode:
the embodiment is described below with reference to fig. 1-8, and the position adjusting device 2 includes a side sliding seat 2-1, a cross beam 2-2, a trapezoidal rod 2-3, a side sliding groove 2-4, an ear plate 2-5, an inserting plate 2-6, a sliding sleeve 2-7 and a first lead screw 2-8; the front and the rear cross beams 2-2 are fixedly connected between the left and the right side sliding seats 2-1, the two cross beams 2-2 are respectively fixedly connected with a trapezoidal rod 2-3, the two mounting bases 3 are respectively connected with the two trapezoidal rods 2-3, the two cross beams 2-2 are respectively provided with a side sliding groove 2-4, the width adjusting piece 6 is in fit connection with the two side sliding grooves 2-4, the outer ends of the two side sliding seats 2-1 are respectively fixedly connected with an ear plate 2-5, the two side sliding seats 2-1 are respectively in slide fit connection with the two right-angle frame plates 1-1, the two ear plates 2-5 are respectively in slide fit connection with the two side through grooves 1-2, the two ear plates 2-5 are respectively fixedly connected with an inserting plate 2-6, the two inserting plates 2-6 are respectively in slide fit connection with the two sliding sleeves 2-7, the two sliding sleeves 2-7 are respectively fixedly connected to the two right-angle frame plates 1-1, the two sliding sleeves 2-7 are respectively connected to the two first lead screws 2-8 in a threaded fit mode, and the two first lead screws 2-8 are respectively rotatably connected to the outer ends of the two ear plates 2-5. When the device is used, the two first lead screws 2-8 can be rotated to drive the two side sliding seats 2-1, the two cross beams 2-2 and the two trapezoidal rods 2-3 to move back and forth through the two lug plates 2-5, the two trapezoidal rods 2-3 drive the two mounting bases 3 and the two mounting clamping pieces 4 to move back and forth, and the positions of the two mounting clamping pieces 4 are driven 7 to change.
The fourth concrete implementation mode:
the embodiment is described below with reference to fig. 1-8, and the mounting base 3 includes a right-angle plate 3-1, a convex plate 3-2, a spring seat 3-3, a hinge seat 3-4, a convex block 3-5 and a guide rod 3-6; the right-angle plate 3-1 is connected with one end of the front trapezoidal rod 2-3 and the rear trapezoidal rod 2-3 in a sliding fit manner, the inner end of the right-angle plate 3-1 is fixedly connected with the convex plate 3-2, the convex plate 3-2 is fixedly connected with the two spring seats 3-3, the outer end of the right-angle plate 3-1 is fixedly connected with the hinged seat 3-4, the width adjusting piece 6 is connected with the hinged seat 3-4, and the installation clamping piece 4 is connected with the spring seats 3-3 in a fit manner; the guide rod 3-6 is fixedly connected to the front end of the inner end of the right-angle plate 3-1 through a bump 3-5, and the disassembling control piece 5 is connected with the guide rod 3-6 in a matching mode. When the voltage stabilizer is used, the lower end pair of the voltage stabilizer body 7 is abutted on the two right-angle plates 3-1, the two right-angle plates 3-1 support the voltage stabilizer body 7, the two right-angle plates 3-1 can simultaneously slide in the opposite directions or in the opposite directions by adjusting the width adjusting piece 6, the distance between the two right-angle plates 3-1 is changed, the two right-angle plates 3-1 can be suitable for the voltage stabilizer bodies 7 with different lengths, the two right-angle plates 3-1 can simultaneously slide in the opposite directions or in the opposite directions by adjusting the width adjusting piece 6, after the distance between the two right-angle plates 3-1 is changed, the voltage stabilizer bodies 7 on the two right-angle plates 3-1 are always in the middle position of the fixed underframe 1, and the position of the voltage stabilizer bodies 7 cannot deviate.
The fifth concrete implementation mode:
the embodiment is described below with reference to fig. 1 to 8, and the mounting and retaining member 4 includes a sliding plate 4-1, a retaining rib 4-2, a spring rod 4-3 and a compression spring 4-4; the outer end of the sliding plate 4-1 is fixedly connected with the clamping edge 4-2, and the inner end of the sliding plate 4-1 is fixedly connected with two spring rods 4-3; the spring rod 4-3 is connected to the spring seat 3-3 in a sliding fit manner; the spring rod 4-3 is sleeved with a compression spring 4-4; two ends of the compression spring 4-4 are respectively and fixedly connected with a sliding plate 4-1 and a spring seat 3-3; the front end of the sliding plate 4-1 is connected with a disassembly control piece 5; the clamping edge 4-2 is clamped in the clamping edge groove 7-1. When the voltage stabilizer is used, the voltage stabilizer body 7 is pressed downwards or the voltage stabilizer body 7 moves downwards under the action of self gravity to extrude the two clamping edges 4-2 to draw close inwards and contract, meanwhile, the four compression springs 4-4 are compressed, when the bottom surface of the voltage stabilizer body 7 is abutted against the two mounting bases 3, the two clamping edges 4-2 drive the two clamping edges 4-2 to move outwards under the action of the elastic force of the compression springs 4-4, so that the two clamping edges 4-2 are automatically clamped in the two clamping edge grooves 7-1, the four compression springs 4-4 can give thrust to the outer ends of the two clamping edges 4-2, the two clamping edges 4-2 can be stably clamped in the two clamping edge grooves 7-1, the voltage stabilizer body 7 is fixed, the mounting of the voltage stabilizer body 7 is realized quickly and conveniently, when the voltage stabilizer body 7 is dismounted, the voltage stabilizer body 7 can be detached only by detaching the control part 5 to drive the two clamping edges 4-2 to contract inwards to be separated from the two clamping edge grooves 7-1, so that the voltage stabilizer body 7 can be rapidly mounted and dismounted.
The sixth specific implementation mode:
referring to fig. 1 to 8, the disassembly control member 5 of the present embodiment comprises a fixed jaw 5-1, a slide block 5-2, a pull rod 5-3, a screw frame 5-4, a side slide frame 5-5, a i-shaped slide block 5-6, an L-shaped base frame 5-7 and an articulated arm 5-8; the fixed splint 5-1 is fixedly connected on the width adjusting piece 6, the slide block 5-2 is connected on the fixed splint 5-1 in a sliding fit way, the pull rod 5-3 is fixedly connected on the slide block 5-2, the pull rod 5-3 is connected on the screw frame 5-4 in a sliding fit way, the screw frame 5-4 is fixedly connected on the fixed splint 5-1, two ends of the slide block 5-2 are respectively and fixedly connected with a side sliding frame 5-5, two I-shaped slide blocks 5-6 are respectively connected in the two side sliding frames 5-5 in a sliding fit way, the lower ends of the two I-shaped slide blocks 5-6 are respectively and fixedly connected with an L-shaped underframe 5-7, the two L-shaped underframe 5-7 are respectively connected on a guide rod 3-6 on the two installation bases 3 in a sliding fit way, the upper ends of the two I-shaped slide blocks 5-6 are respectively and rotatably connected with an articulated arm 5-8, the two hinge arms 5-8 are rotatably connected to the front ends of the two slide plates 4-1 mounted on the locking member 4, respectively. The four compression springs 4-4 can provide pushing force to the outer ends of the two clamping edges 4-2, the sliding block 5-2 is connected with the two sliding plates 4-1 through the two hinged arms 5-8, the sliding block 5-2 is provided with backward pulling force under the elastic force action of the four compression springs 4-4, when the voltage stabilizer is used and a voltage stabilizer body 7 needs to be dismounted, the pull rod 5-3 is pulled forwards, the pull rod 5-3 drives the clamping edges 4-2 on the two sliding plates 4-1 to slide oppositely through the sliding block 5-2 and the two hinged arms 5-8, the two clamping edges 4-2 are separated from the two clamping edge grooves 7-1, and therefore the voltage stabilizer body 7 is dismounted quickly; when the two mounting bases 3 drive the distance between the two mounting clamping pieces 4 to change, the two I-shaped sliding blocks 5-6 slide in the two side sliding frames 5-5 in an opposite direction or in a deviating direction, so that the function of pulling the pull rod 5-3 to rapidly dismount the voltage stabilizer body 7 cannot be influenced even if the distance between the two mounting clamping pieces 4 changes.
The seventh embodiment:
the present embodiment is described below with reference to fig. 1 to 8, and the width adjusting member 6 includes a front frame plate 6-1, a worm 6-2, a gear 6-3, a rack 6-4, a second lead screw 6-5, a worm wheel 6-6, a third lead screw 6-7, a lead screw seat 6-8, a groove block 6-9 and a hinge rod 6-10; the front frame plate 6-1 is fixedly connected to the cross beam 2-2 at the front end, the worm 6-2 is rotatably connected to the front frame plate 6-1, the gear 6-3 is fixedly connected to the middle part of the front frame plate 6-1, the rack 6-4 is in meshing transmission connection with the gear 6-3, the rack 6-4 is in sliding fit connection with the front end of the front frame plate 6-1, the rack 6-4 is in threaded fit connection with the second lead screw 6-5, the second lead screw 6-5 is rotatably connected to the front frame plate 6-1, two ends of the second lead screw 6-5 are respectively in meshing transmission connection with the two worm gears 6-6, the two worm gears 6-6 are respectively fixedly connected to the two third lead screws 6-7, the two third lead screws 6-7 are respectively rotatably connected to the two lead screw seats 6-8, two lead screw seats 6-8 are respectively fixedly connected to two side sliding seats 2-1, two groove blocks 6-9 are respectively connected to two third lead screws 6-7 through thread fit, the two groove blocks 6-9 are respectively connected in two side sliding grooves 2-4 in a sliding fit manner, the upper ends of the two groove blocks 6-9 are respectively rotatably connected with a hinge rod 6-10, and the two hinge rods 6-10 are respectively rotatably connected with the outer ends of right-angle plates 3-1 on two mounting bases 3; the fixed splint 5-1 is fixedly connected on the front frame plate 6-1. When in use, the second lead screw 6-5 is rotated to drive the rack 6-4 to move back and forth, the rack 6-4 drives the worm 6-2 to rotate through the gear 6-3, the worm 6-2 drives the two third lead screws 6-7 to rotate through the two worm gears 6-6, the two third lead screws 6-7 drive the two groove blocks 6-9 to move forward or backward, the two groove blocks 6-9 drive the two right-angle plates 3-1 to slide in an opposite direction or a deviating direction through the two hinge rods 6-10, the distance between the two installation clamping pieces 4 is changed, the voltage stabilizer body 7 with different lengths is used, when the distance between the two right-angle plates 3-1 is changed, the two L-shaped bottom frames 5-7 are driven by the two guide rods 3-6 to slide in an opposite direction or a deviating direction, the two L-shaped bottom frames 5-7 drive the two I-shaped sliding blocks 5-6 to slide in an opposite direction or a deviating direction, when the pull rod 5-3 is pulled, the two L-shaped underframe 5-7 can slide on the two guide rods 3-6.
The specific implementation mode is eight:
in the embodiment described below with reference to fig. 1 to 8, the outer end surface of the clamping edge 4-2 is inclined downward from inside to outside, so that the lower end of the voltage regulator body 7 presses the clamping edge 4-2 inward, and the bottom surface of the clamping edge 4-2 can clamp the voltage regulator body 7.
The working principle of the installation device of the voltage stabilizer of the invention is as follows: when the device is used, the lower end of the voltage stabilizer body 7 is aligned with the two mounting clamping pieces 4, the voltage stabilizer body 7 is pressed downwards or the voltage stabilizer body 7 can move downwards under the action of self gravity to extrude the two mounting clamping pieces 4 to draw close inwards, when the bottom surface of the voltage stabilizer body 7 is abutted against the two mounting bases 3, the two mounting clamping pieces 4 can be automatically clamped in the clamping edge groove 7-1, the mounting of the voltage stabilizer body 7 can be realized quickly and conveniently, when the voltage stabilizer body 7 is dismounted, the control piece 5 only needs to be pulled forwards to lead the two mounting clamping pieces 4 to contract inwards to be separated from the clamping edge groove 7-1, the voltage stabilizer body 7 can be dismounted, the mounting and dismounting of the voltage stabilizer body 7 can be realized quickly, the distance between the two mounting bases 3 can be changed by adjusting the width adjusting piece 6, the two mounting bases 3 drive the distance between the two mounting clamping pieces 4 to change, and then can install the stabiliser body 7 of different length, can adjust stabiliser body 7 front and back position through adjusting position adjusting device 2, let two installation screens 4 slide in opposite directions or deviate from simultaneously through width control spare 6 for install stabiliser body 7 on two installation screens 4 and be in the position in the middle of fixed chassis 1 all the time, thereby make the distance between two installation screens 4 change the back, the skew can not take place for stabiliser body 7's position.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions and substitutions which are within the spirit and scope of the present invention and which may be made by those skilled in the art are also within the scope of the present invention.