阅读说明：本技术 一种适用于手锯的规范切割路径装置 (Standard cutting path device suitable for handsaw ) 是由 何井芳 何锦霞 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种适用于手锯的规范切割路径装置,包括底部连接框架,所述底部连接框架的上表面左右两端均通过焊接的方式连接有两组支撑腿,每组支撑腿的上端通过焊接的方式连接有上端连接板,两个上端连接板左右对应,上端连接板的上表面一侧通过焊接的方式连接有一组第一连接耳板,所述第一连接耳板的一侧通过螺栓连接的方式连接有第一电动伸缩杆,所述上端连接板的上表面设有L型定位板,本适用于手锯的规范切割路径装置结构简单,操作简便,不但使得可以对木头进行固定,而且可以对木头进行调节,并且使得对手锯的切割路径定位更加方便,使得木头切割端面更加整齐,为人们提供了方便。(The invention discloses a standard cutting path device suitable for a hand saw, which comprises a bottom connecting frame, wherein the left end and the right end of the upper surface of the bottom connecting frame are respectively connected with two groups of supporting legs in a welding mode, the upper end of each group of supporting legs is connected with an upper end connecting plate in a welding mode, the two upper end connecting plates correspond to each other left and right, one side of the upper surface of the upper end connecting plate is connected with a group of first connecting lug plates in a welding mode, one side of each first connecting lug plate is connected with a first electric telescopic rod in a bolt connection mode, and the upper surface of the upper end connecting plate is provided with an L-shaped positioning plate. Providing convenience for people.)

1. A canonical cutting path device suitable for a handsaw, comprising a bottom connection frame (4), characterized in that: the left end and the right end of the upper surface of the bottom connecting frame (4) are connected with two groups of supporting legs (3) in a welding mode, the upper end of each group of supporting legs (3) is connected with an upper end connecting plate (1) in a welding mode, the two upper end connecting plates (1) correspond to each other in a left-right mode, one side of the upper surface of the upper end connecting plate (1) is connected with a group of first connecting lug plates (12) in a welding mode, one side of each first connecting lug plate (12) is connected with a first electric telescopic rod (13) in a bolt connection mode, the upper surface of the upper end connecting plate (1) is provided with an L-shaped positioning plate (14), one side of the upper surface of the L-shaped positioning plate (14) is connected with a second connecting lug plate (15) in a welding mode, the second connecting lug plate (15) corresponds to the first connecting lug plates (12) mutually, and one side of the second connecting lug plate (15) is connected with the, the opposite sides of the vertical plates of the two L-shaped positioning plates (14) are connected with a cutting path positioning plate (16) in a bolt connection mode, two ends of the upper surface of the bottom connecting frame (4) are connected with two first hydraulic telescopic rods (9) through bolts, the telescopic ends of the first hydraulic telescopic rods (9) are connected with a supporting plate (10) in a bolt connection mode, the upper surface of the supporting plate (10) is pasted with a protective pad through glue, the upper surface of the protective pad is provided with anti-skidding threads, one side of the upper surface of the bottom connecting frame (4) is connected with a first hydraulic pump (18) in a bolt connection mode, the outlet of the first hydraulic pump (18) is connected with the inlet of the first hydraulic telescopic rods (9) through oil pipes, the lower side of the opposite ends of the two supporting plates (10) is connected with a first sliding rail (2) in a welding mode, the first sliding rails (2) on the two supporting plates (10), one side of the first sliding rail (2) is provided with a sliding connection block (25) in sliding connection, one side of the sliding connection block (25) is connected with a rotating connection column (21) in a bearing connection mode, a second sliding rail (26) is connected between the two rotating connection columns (21) in a welding mode, the front surface of the second sliding rail (26) is provided with a U-shaped connection seat (24), the rear surface of the U-shaped connection seat (24) is provided with a sliding connection column, the sliding connection column on the U-shaped connection seat (24) corresponds to the second sliding rail (26), two sides of a U-shaped groove of the U-shaped connection seat (24) are connected with a second electric telescopic rod (23) in a bolt connection mode, the telescopic end of the second electric telescopic rod (23) is connected with a fixing plate (22) in a bolt connection mode, the upper end of one side of the supporting leg (3) is connected with a control switch (8, the input end of the control switch (8) is electrically connected with the output end of an external power supply, and the output end of the control switch (8) is electrically connected with the input ends of the first electric telescopic rod (13), the first hydraulic pump (18) and the second electric telescopic rod (23).

2. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: the lower surface four corners of bottom linking frame (4) are connected with connection socle (7) through the welded mode, and the lower surface of connecting socle (7) is pasted through glue has the rubber leather pad.

3. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: the number of the first connecting lug plates (12) is four, two first connecting lug plates (12) form a group, and the number of the second connecting lug plates (15) corresponding to the first connecting lug plates (12) is also four.

4. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: the opposite sides of the two fixing plates (22) are connected with rubber protective pads in a glue pasting mode, and anti-skid lines are arranged on the outer sides of the rubber protective pads.

5. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: the number of the supporting legs (3) is four, the two supporting legs (3) are in a group, and the four supporting legs (3) are respectively positioned at four corners of the bottom connecting frame (4).

6. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: polishing plates are arranged on the opposite sides of the two cutting path positioning plates (16), and 45-degree chamfer angles are arranged at the upper ends of the cutting path positioning plates (16).

7. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: and a waste bin (6) is arranged between the bottom connecting frames (4), and an upper end opening of the waste bin (6) is positioned at the upper end between the two upper end connecting plates (1).

8. A normalized cutting path apparatus adapted for use with a hand saw as defined in claim 7, wherein: the front end and the rear end of the waste bin (6) are connected with an installation lug plate (5) in a welding mode, two bolt holes are formed in the installation lug plate (5), and internal threads are arranged on the inner sides of the bolt holes.

9. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: the upper end of one side opposite to each group of supporting legs (3) is connected with a second hydraulic telescopic rod (20) through a bolt, the telescopic end of the second hydraulic telescopic rod (20) is connected with a side pressing plate (11) through a bolt, one side of the upper surface of the bottom connecting frame (4) is connected with a second hydraulic pump (19) through a bolt, the outlet of the second hydraulic pump (19) is connected with the inlet of the second hydraulic telescopic rod (20) through an oil pipe, and the input end of the second hydraulic pump (19) is electrically connected with the output end of the control switch (8).

10. A normalized cutting path apparatus adapted for use with a hand saw, as defined in claim 1, wherein: the upper surface of upper end connecting plate (1) is equipped with a set of slip pillar (17), the lower surface of L type locating plate (14) is equipped with the slip recess that corresponds with slip pillar (17).

Technical Field

The invention relates to the technical field of cutting processes, in particular to a standard cutting path device suitable for a handsaw.

Background

The handsaw is as present commonly used building tool, generally leans on the seesaw of arm to drive work, because length is very long around the whole saw blade, the inevitable route can be inclined a bit when cutting, especially domestic hand according to, is only a simple saw blade, can appear the skew when making people cut like this, has influenced aesthetic measure greatly to this makes planned size change, the cost is improved.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the existing defects, provide a standard cutting path device suitable for a handsaw, which has the advantages of simple structure and simple and convenient operation, not only can fix wood, but also can adjust the wood, and can more conveniently position the cutting path of the handsaw, so that the cutting end face of the wood is more neat, thereby providing convenience for people and effectively solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a standard cutting path device suitable for a handsaw comprises a bottom connecting frame, wherein the left end and the right end of the upper surface of the bottom connecting frame are connected with two groups of supporting legs in a welding mode, the upper end of each group of supporting legs is connected with an upper end connecting plate in a welding mode, the two upper end connecting plates correspond to each other in a left-right mode, one side of the upper surface of the upper end connecting plate is connected with a group of first connecting lug plates in a welding mode, one side of each first connecting lug plate is connected with a first electric telescopic rod in a bolt connection mode, an L-shaped positioning plate is arranged on the upper surface of the upper end connecting plate, one side of the upper surface of the L-shaped positioning plate is connected with a second connecting lug plate in a welding mode, the second connecting lug plates correspond to the first connecting lug plates, one side of each second connecting lug plate is connected with the telescopic end of the first electric telescopic rod in a bolt mode, and the opposite sides of the vertical plates of the two L, two ends of the upper surface of the bottom connecting frame are connected with two first hydraulic telescopic rods through bolts, the telescopic ends of the first hydraulic telescopic rods are connected with a supporting plate through a bolt connection mode, a protective pad is pasted on the upper surface of the supporting plate through glue, anti-skid lines are arranged on the upper surface of the protective pad, one side of the upper surface of the bottom connecting frame is connected with a first hydraulic pump through a bolt connection mode, the outlet of the first hydraulic pump is connected with the inlet of the first hydraulic telescopic rod through an oil pipe, the lower side of the opposite end of the two supporting plates is connected with a first sliding track through a welding mode, the left side and the right side of the first sliding track on the two supporting plates correspond to each other, one side of the first sliding track is provided with a sliding connecting block in sliding connection, one side of the sliding connecting block is connected with a rotating connecting column through a bearing connection mode, the orbital front surface that slides of second is equipped with U type connecting seat, and the rear surface of U type connecting seat is equipped with the slip post, and the slip post on the U type connecting seat corresponds with second slip track each other, the U type recess both sides of U type connecting seat are connected with second electric telescopic handle through bolted connection's mode, and second electric telescopic handle's flexible end is connected with the fixed plate through bolted connection's mode, one side upper end of supporting leg is connected with control switch through bolted connection's mode, and external power source's output is connected to control switch's input electricity, and control switch's output is connected with the input that connects first electric telescopic handle, first hydraulic pump and second electric telescopic handle.

As a preferred technical scheme of the invention, four corners of the lower surface of the bottom connecting frame are connected with connecting stilts in a welding mode, and rubber leather pads are adhered to the lower surfaces of the connecting stilts through glue.

As a preferable embodiment of the present invention, the number of the first connecting lug plates is four, two first connecting lug plates form a group, and the number of the second connecting lug plates corresponding to the first connecting lug plates is also four.

As a preferred technical scheme of the invention, one side of the two fixing plates opposite to each other is connected with a rubber protective pad in a glue pasting mode, and the outer side of the rubber protective pad is provided with anti-skid lines.

As a preferred technical scheme of the invention, the number of the supporting legs is four, two supporting legs are in a group, and the four supporting legs are respectively positioned at four corners of the bottom connecting frame.

As a preferable technical scheme, polishing plates are arranged on the opposite sides of the two cutting path positioning plates, and 45-degree chamfer angles are arranged at the upper ends of the cutting path positioning plates.

As a preferred technical scheme of the invention, a waste bin is arranged between the bottom connecting frames, and an upper end opening of the waste bin is positioned at the upper end between the two upper end connecting plates.

As a preferred technical scheme of the invention, the front end and the rear end of the waste bin are connected with mounting lug plates in a welding mode, two bolt holes are formed in the mounting lug plates, and internal threads are arranged on the inner sides of the bolt holes.

As a preferable technical scheme of the invention, the upper end of one side, opposite to each group of supporting legs, of each group of supporting legs is connected with a second hydraulic telescopic rod through a bolt, the telescopic end of each second hydraulic telescopic rod is connected with a side pressure plate through a bolt, one side of the upper surface of the bottom connecting frame is connected with a second hydraulic pump through a bolt, the outlet of the second hydraulic pump is connected with the inlet of the second hydraulic telescopic rod through an oil pipe, and the input end of the second hydraulic pump is electrically connected with the output end of a control switch.

As a preferred technical scheme of the present invention, a set of sliding support columns is disposed on the upper surface of the upper end connecting plate, and sliding connection grooves corresponding to the sliding support columns are disposed on the lower surface of the L-shaped positioning plate.

Compared with the prior art, the invention has the beneficial effects that:

1. the first electric telescopic rod is arranged on the saw blade path adjusting device, the L-shaped positioning plate can be driven to move through the first electric telescopic rod, the L-shaped positioning plate can move more smoothly through the sliding support, the cutting path positioning plate can be driven to move through the L-shaped positioning plate, so that the distance between the two cutting path positioning plates can be adjusted, the saw blade path can be positioned through the two cutting path positioning plates, and convenience is brought to people.

2. The wood protection device is provided with the first hydraulic pump, the first hydraulic telescopic rod can be controlled to stretch through the first hydraulic pump, the supporting plates can be driven to move up and down through the first hydraulic telescopic rod, wood can be supported through the two supporting plates, the upper position and the lower position of the wood can be adjusted through the supporting plates, so that the wood is more convenient to adjust, and the wood is protected through the protection pads on the upper surfaces of the supporting plates.

3. The second electric telescopic rod is arranged on the hand saw, the fixing plate can be driven to move through the second electric telescopic rod, the lower end of the saw blade can be fixed through the fixing plate, the saw blade is more convenient to fix, the U-shaped connecting seat can be driven to move up and down when the saw blade moves up and down, the saw blade can move up and down more smoothly, the hand saw can be sawed up and down more normally, the connecting column is rotated to drive the second sliding rail to rotate, and therefore the angle of the hand saw is adjusted.

4. The wood sawdust collecting device is provided with the second hydraulic pump, the second hydraulic telescopic rod can be controlled to stretch through the second hydraulic pump, the side pressure plates can be driven to stretch through the second hydraulic telescopic rod, the front side and the rear side of wood can be fixed through the side pressure plates, the two ends of the waste bin can be fixed through the mounting lug plates, sawdust can be contained through the waste bin, and therefore waste materials can be contained more conveniently.

5. The connecting foot posts are arranged on the standard cutting path device, the device can be supported through the connecting foot posts, and the saw blade can move up and down more smoothly through the polishing plates on the cutting path positioning plates.

Drawings

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

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A of the present invention.

In the figure: 1 upper end connecting plate, 2 first slip track, 3 supporting legs, 4 bottom connected frames, 5 installation otic placodes, 6 waste bin, 7 connection socle, 8 control switch, 9 first hydraulic telescoping rod, 10 backup pads, 11 side clamp plates, 12 first connection otic placodes, 13 first electric telescopic handle, 14L type locating plate, 15 second connection otic placodes, 16 cutting route locating plate, 17 sliding support, 18 first hydraulic pump, 19 second hydraulic pump, 20 second hydraulic telescoping rod, 21 rotation spliced poles, 22 fixed plates, 23 second electric telescopic handle, 24U type connecting seats, 25 sliding connection piece, 26 second slip track.

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. 1-3, the present invention provides a technical solution: a standard cutting path device suitable for a handsaw comprises a bottom connecting frame 4, wherein the left end and the right end of the upper surface of the bottom connecting frame 4 are connected with two groups of supporting legs 3 in a welding mode, the upper end of each group of supporting legs 3 is connected with an upper end connecting plate 1 in a welding mode, the two upper end connecting plates 1 correspond to each other left and right, one side of the upper surface of the upper end connecting plate 1 is connected with a group of first connecting lug plates 12 in a welding mode, one side of each first connecting lug plate 12 is connected with a first electric telescopic rod 13 in a bolt connection mode, the upper surface of the upper end connecting plate 1 is provided with an L-shaped positioning plate 14, one side of the upper surface of the L-shaped positioning plate 14 is connected with a second connecting lug plate 15 in a welding mode, the second connecting lug plate 15 corresponds to the first connecting lug plate 12, and one side of the second connecting lug plate 15 is connected with the telescopic end of the first, the opposite sides of the vertical plates of the two L-shaped positioning plates 14 are connected with cutting path positioning plates 16 in a bolt connection mode, the L-shaped positioning plates 14 can be driven to move through the first electric telescopic rods 13, the L-shaped positioning plates 14 can be moved more smoothly through the sliding support columns 17, the cutting path positioning plates 16 can be driven to move through the L-shaped positioning plates 14, the distance between the two cutting path positioning plates 16 can be adjusted, the saw blade paths can be positioned through the two cutting path positioning plates 16, convenience is provided for people, two ends of the upper surface of the bottom connecting frame 4 are connected with two first hydraulic telescopic rods 9 through bolts, the telescopic ends of the first hydraulic telescopic rods 9 are connected with a supporting plate 10 in a bolt connection mode, a protective pad is adhered to the upper surface of the supporting plate 10 through glue, and anti-skid grains are arranged on the upper surface of the protective pad, one side of the upper surface of the bottom connecting frame 4 is connected with a first hydraulic pump 18 in a bolt connection mode, an outlet of the first hydraulic pump 18 is connected with an inlet of a first hydraulic telescopic rod 9 through an oil pipe, the first hydraulic telescopic rod 9 can be controlled to stretch through the first hydraulic pump 18, the support plates 10 can be driven to move up and down through the first hydraulic telescopic rod 9, wood can be supported through the two support plates 10, the upper and lower positions of the wood can be adjusted through the support plates 10, so that the adjustment is more convenient, the wood is protected through a protection pad on the upper surface of the support plates 10, the lower sides of the opposite ends of the two support plates 10 are connected with first sliding rails 2 in a welding mode, the left and right sides of the first sliding rails 2 on the two support plates 10 correspond to each other, one side of the first sliding rails 2 is provided with a sliding connecting block 25 in a sliding connection mode, one side of the sliding connecting block 25, a second sliding rail 26 is connected between the two rotating connecting posts 21 in a welding manner, a U-shaped connecting seat 24 is arranged on the front surface of the second sliding rail 26, a sliding post is arranged on the rear surface of the U-shaped connecting seat 24, the sliding post on the U-shaped connecting seat 24 corresponds to the second sliding rail 26, two sides of a U-shaped groove of the U-shaped connecting seat 24 are connected with a second electric telescopic rod 23 in a bolt connection manner, the telescopic end of the second electric telescopic rod 23 is connected with a fixing plate 22 in a bolt connection manner, the fixing plate 22 can be driven to move by the second electric telescopic rod 23, the lower end of a saw blade can be fixed by the fixing plate 22, the saw blade can be more conveniently fixed, the U-shaped connecting seat 24 can be driven to move up and down when moving up and down, the saw blade can move up and down more smoothly, the hand saw can move up and down more normally, the second sliding rail 26 is driven to rotate, the angle of the handsaw is adjusted, the upper end of one side of the supporting leg 3 is connected with a control switch 8 by a bolt connection mode, the input end of the control switch 8 is electrically connected with the output end of an external power supply, the output end of the control switch 8 is electrically connected with the input ends of a first electric telescopic rod 13, a first hydraulic pump 18 and a second electric telescopic rod 23, four corners of the lower surface of the bottom connecting frame 4 are connected with connecting legs 7 by a welding mode, rubber pads are pasted on the lower surface of the connecting legs 7 by glue, the device can be supported by the connecting legs 7, the number of the first connecting ear plates 12 is four, two first connecting ear plates 12 are in one group, the number of the second connecting ear plates 15 corresponding to the first connecting ear plates 12 is also four, the L-shaped positioning plate 14 can move more smoothly by the four first electric telescopic rods 13, one side opposite to the two glue fixing plates 22 is connected with a rubber protection pad by a pasting mode, the outer side of the rubber protective pad is provided with anti-slip lines, the saw blade is more firmly fixed through the rubber protective pad on the fixing plate 22, the number of the supporting legs 3 is four, two supporting legs 3 are in a group, the four supporting legs 3 are respectively positioned at four corners of the bottom connecting frame 4, one sides opposite to the two cutting path positioning plates 16 are respectively provided with polishing plates, the upper ends of the cutting path positioning plates 16 are provided with 45-degree bevels, the saw blade can more smoothly move up and down through the polishing plates on the cutting path positioning plates 16, a waste bin 6 is arranged between the bottom connecting frames 4, the upper end opening of the waste bin 6 is positioned at the upper end between the two upper end connecting plates 1, the front end and the rear end of the waste bin 6 are connected with mounting lug plates 5 in a welding mode, the mounting lug plates 5 are provided with two bolt holes, the inner sides of the, the sawdust can be contained through the waste bin 6, so that the waste can be more conveniently contained, the upper end of one side, opposite to each group of supporting legs 3, of each group of supporting legs is connected with a second hydraulic telescopic rod 20 through a bolt, the telescopic end of each second hydraulic telescopic rod 20 is connected with a side pressure plate 11 through a bolt, one side of the upper surface of the bottom connecting frame 4 is connected with a second hydraulic pump 19 through a bolt, the outlet of the second hydraulic pump 19 is connected with the inlet of the second hydraulic telescopic rod 20 through an oil pipe, the input end of the second hydraulic pump 19 is electrically connected with the output end of a control switch 8, the control switch 8 is provided with control keys corresponding to the second hydraulic pump 19, a first electric telescopic rod 13, a first hydraulic pump 18 and a second electric telescopic rod 23, the second hydraulic telescopic rod 20 can be controlled to be stretched through the second hydraulic pump 19, the side pressure plate 11 can be driven to be stretched through the second hydraulic telescopic rod 20, and the front side and, upper end connecting plate 1's upper surface is equipped with a set of sliding support post 17, L type locating plate 14's lower surface is equipped with the slip recess that corresponds with sliding support post 17, it is more smooth to make L type locating plate 14 remove through sliding support post 17, this standard cutting path device simple structure who is applicable to the handsaw, and is easy and simple to handle, not only make and fix wood, and can adjust wood moreover, and it is more convenient to make the cutting path location to the handsaw, make wood cutting terminal surface more neat, for people provide convenience.

When in use: supporting wood through two supporting plates 10, controlling the first hydraulic telescopic rod 9 to stretch through a first hydraulic pump 18, driving the supporting plates 10 to move up and down through the first hydraulic telescopic rod 9, adjusting the upper and lower positions of the wood through the supporting plates 10, controlling the second hydraulic telescopic rod 20 to stretch through a second hydraulic pump 19, driving the side pressing plates 11 to stretch through the second hydraulic telescopic rod 20, fixing the front and rear sides of the wood through the side pressing plates 11, driving the fixing plate 22 to move through a second electric telescopic rod 23, fixing the lower end of the saw blade through the fixing plate 22, driving the second sliding track 26 to rotate through rotating the connecting column 21 to adjust the angle of the handsaw, driving the L-shaped positioning plate 14 to move through the first electric telescopic rod 13, and enabling the L-shaped positioning plate 14 to move more smoothly through the sliding support column 17, and drive cutting route locating plate 16 through L type locating plate 14 and remove to this can adjust the distance between two cutting route locating plates 16, fixes a position the saw blade route through two cutting route locating plates 16, when the handsaw sawed from top to bottom, drove U type connecting seat 24 through the handsaw and reciprocate, with this make the handsaw more standard when sawing from top to bottom.

The invention can drive the L-shaped positioning plate 14 to move through the first electric telescopic rod 13, the L-shaped positioning plate 14 can move more smoothly through the sliding support column 17, the L-shaped positioning plate 14 can drive the cutting path positioning plate 16 to move, so that the distance between the two cutting path positioning plates 16 can be adjusted, the saw blade path can be positioned through the two cutting path positioning plates 16, the fixing plate 22 can be driven to move through the second electric telescopic rod 23, the lower end of the saw blade can be fixed through the fixing plate 22, so that the saw blade is more convenient to fix, the U-shaped connecting seat 24 can be driven to move up and down when the saw blade moves up and down, so that the saw blade can move up and down more smoothly, the upper and lower sawing of the hand saw is more standard, the connecting column 21 is rotated to drive the second sliding track 26 to rotate, so as to adjust the angle of the, this standard cutting route device suitable for handsaw simple structure, it is easy and simple to handle, not only make can fix wood, can adjust wood moreover to make the cutting route location to the handsaw more convenient, make wood cutting terminal surface more neat, provide convenience for people.

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.