Patent Grant
11731306
This invention relates generally to the field of woodworking tools, and more particularly to the field of accessories for feeding stock safely across a saw table.
A table saw typically includes a flat, horizontally oriented table having an opening formed therein through which a top portion of a circular saw blade protrudes. The saw blade may be 10-12 inches in diameter, for example, and is motor driven to rotate at a speed of 3,000 revolutions per minute or more. A piece of stock material, typically wood, may be cut by moving it across the table to intersect the spinning saw blade. The height of the top of the saw blade above the table may be adjustable within predetermined limits in order to accommodate stock material of various thicknesses. A fence is provided with a table saw to guide the movement of the stock in a direction parallel to the plane of the saw blade in order to ensure a straight cut and to avoid binding of the non-cutting portions of the saw blade within the stock material. A fence typically includes an elongated metal bar having a flat guide face oriented at a right angle with respect to the table and parallel to the plane of the saw blade. The distance between the fence guide face and the saw blade may be adjustable within predetermined limits in order to accommodate stock material and cut locations having various widths.
U.S. Pat. No. 7,540,224, incorporated by reference herein in its entirety, describes a sophisticated prior art adjustable pushing apparatus for safely moving a work piece past a saw blade. As can be seen in
The apparatus 50 may be formed of component parts that can be attached or removed as desired. Body 52 is the structural base to which other components are attached, either directly or indirectly. Body 52 may be formed to include a slot or keyway 66 on opposed leading and trailing edges for receiving mating tongues or keys 68 formed on respective leading and trailing portions of center leg 60. Center leg 60 is assembled onto body 52 by sliding keys 68 into the opening slot of keyways 66 to position center leg 60 at a selected location along the underside 70 of body 52. The center leg 60 may be affixed at any selected location by tightening thumb screws 72 into mating nuts (not shown) located within the keyway 66, thereby drawing the keys 68 tight against the body 52. The location of center leg 60 defines the respective widths of tunnels 62,64.
First leg 56 and second leg 58 may be assembled onto the sides of body 52 by threading bolts through counter-bored holes in the respective leg into nuts embedded or otherwise retained in body 52. (The hardware is not shown in the FIGURES.) Each of the legs 56, 58 includes a flat side surface 74 adapted for abutting a flat guide surface of a saw table fence. Any mounting hardware exposed along the side surface 74 should be mounted flush or counter-bored below surface 74 so as not to interfere with the smooth movement of side surface 74 across a guide surface. Apparatus 50 may be assembled to include one or both of first leg 56 and second leg 58, depending upon the requirements of a particular operation. The legs 56, 58, 60 each extend away from the underside 70 of body 52 to form respective work piece-contacting surfaces 76. These work piece-contacting surfaces 76 are preferably non-slip surfaces, being formed from a material that does not easily slide over a work piece surface, for example rubber or a thermoplastic elastomer. A non-slip material may be molded into or may be attached to the bottom of the respective leg 56, 58 with an adhesive, or a non-slip material may be partially embedded into the bottom surface of the legs, or the material of the legs may be sufficiently roughened to be non-slip. It is preferred that the non-slip material used to form work piece-contacting surface 76 be slightly recessed from the first and second leg side surfaces 74 so as not to interfere with the smooth movement of side surface 74 across a fence guide surface. The elastomer is sufficiently soft that it will deform to accommodate the inherent unevenness of a molded plastic surface, thereby further increasing its non-slip property. Grooves 77 may be formed in the surface 76 to accommodate a degree of unevenness of the leg and work piece surfaces and also to accommodate sawdust or other debris deposited on the work piece surface.
Body 52 and legs 56, 58 may include keyways 78 for capturing hardware used to attach handle 54 and/or other accessories. Handle 54 may be moved to any selected position between first leg 56 and second leg 58, then locked into place by tightening bolts 80. Bolt 80 passed through a hole formed in handle 54 and is threaded into a nut disposed within the keyway 78. The location of handle 54 with respect to body 52 may be selected to most advantageously locate the point of application of forces to be applied by an operators hand on the handle 54. Handle 54 may be aligned to be parallel to leg side surface 74 or it may be fixed at an askew position so that the longitudinal axis of the handle 54 is disposed at an angle to the cut line of the saw blade 16 and to a longitudinal axis of the apparatus 50.
The invention is explained in the following description in view of the drawings that show:
The present inventor has devised a unique and innovative push block that incorporates visual indication of safe cut-width settings for a table saw used therewith. When the table saw cut-width is set within the safe cut-width settings indicated on the push block, and when the push block is used against a fence of the table saw, the saw blade will not contact one or more features of the push block. In an example embodiment, the push block includes a center leg and the safe cut-width settings indicated ensure the saw blade does not contact the center leg. In an example embodiment, a distance of the center leg from the fence is adjustable and the visual indication changes as the center leg is moved to reflect changes in the distance of the center leg from the fence. In other example embodiments, the safe cut-width settings indicated ensure the saw blade does not contact a first (outer) leg or a second (fence side) leg of the push block.
In an example embodiment, a position and associated distance of the center leg 140 relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106 when the fence side 132 of the second leg 130 abuts the fence 106) is laterally adjustable via a key 170 and slot 172 arrangement. However, any arrangement that permits this lateral adjustment is suitable. The center leg 140 may be selectively secured in any lateral position via a thumb screw 176 or the like. Adjustment of the position of the center leg 140 adjusts a first tunnel width W1 and a second tunnel width W2. In this example embodiment, the cursor 162 is operatively connected to the center leg and thereby configured to move along the scale 160 with the center leg 140.
As can be seen in
The first position P1 is a safe minimum cut-width position for a saw blade 110 disposed in the second tunnel 154. The first position P1 is disposed at a first distance D1 that is measured from the fence side 132 of the second leg 130. When the fence side 132 of the second leg 130 abuts the fence 106 as shown, the first position P1 is also disposed at the first distance D1 measured from the fence 106. The scale 160 optionally includes a unique first scale indicator SI1 at a location on the scale that corresponds with the first distance D1. As used herein, unique means that the identifier is in addition to and distinguishable from the ruler/distance markings 160E, 160M on the scale 160. In this example embodiment shown, first distance D1 is ¼ inches, so the first scale indicator SI1 is disposed at ¼ inch on the scale 160.
The first distance D1 is disposed at an end of a range of distances Zero to D1 that are measured from the fence side 132 of the second leg 130 and that are associated with a location of the center leg 140. The range of distances Zero to D1 associated with the second leg 130 includes at least: 1) a range of distances RSL that are measured from the fence side 132 of the second leg 130 and that are occupied by the second leg 130; and 2) an optional range of distances ROM2 that are measured from the fence side 132 of the second leg 130 and that are occupied by an outside side safety margin 180 that abuts the outside side 134 of the second leg 130. The range of distances RSL that are measured from the fence side 132 of the second leg 130 and that are occupied by the second leg 130 tells where a width of the second leg 130 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106). Similarly, the range of distances ROM2 that are measured from the fence side 132 of the second leg 130 and that are occupied by the outside side safety margin 180 tells where a width of the outside side safety margin 180 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106).
For example, for a second leg 130 having an example width of ¼ inch, the range of distances RSL measured from the fence side 132 of the second leg 130 would be Zero to ¼ inches. This is because the second leg 130 starts at the fence side 132 of the second leg 130 (D=Zero) and extends its ¼-inch width therefrom. In contrast, for an outside side safety margin 180 having an example width of 1/16 inches (not shown), the range of distances ROM2 measured from the fence side 132 of the second leg 130 would be ¼ inch to 5/16 inch. This is because the outside side safety margin 180 starts at ¼ inches (where the outside side 134 of the second leg 130 is located) and extends its 1/16-inch width away from the outside side 134 of the second leg 130. In such an example embodiment (not shown), the first distance D1 would be 5/16 inches because the first distance D1 indicates an outside end of the range of distances Zero to D1 associated with the second leg 130, and because the range of distances Zero to D1 associated with the second leg 130 includes at least: 1) the range of distances RSL of Zero to ¼ inch plus 2) the range of distances ROM2 of ¼ inch to 5/16 inch. A width of the outside side safety margin 180 can be any suitable size.
The table saw includes a table saw ruler 190 that has a cut width setting indicator CWSI that indicates on the table saw ruler 190 a distance between the fence 106 and the nearest point 174 of the saw blade 110. In the example embodiment shown, when the saw blade 110 is the first position P1, the distance between the fence 106 and the nearest point 174 of the saw blade 110 is the first distance D1. Since the first scale indicator SI1 is disposed at the first distance D1 on the scale 160, an operator who sees the first scale indicator SI1 located at the first distance D1 on the scale 160 will know that the cut width setting indicator CWSI cannot be set below the first distance D1 on the table saw ruler 190 when the saw blade 110 is disposed in the second tunnel 154. This safe minimum cut-width position is indicated as a cut width setting indicator first position CWSIP1 on the table saw ruler 190.
The second position P2 is a safe maximum cut-width position for a saw blade 110 disposed in the second tunnel 154 when the center leg 140 is disposed at the center leg position CLP shown. The second position P2 is disposed at a second distance D2 that is measured from the fence side 132 of the second leg 130. When the fence side 132 of the second leg 130 abuts the fence 106 as shown, the second position P2 is also disposed at the second distance D2 from the fence 106.
The third position P3 is a safe minimum cut-width position for a saw blade 110 disposed in the first tunnel 152 when the center leg 140 is disposed at the center leg position CLP shown. The third position P3 is disposed at a third distance D3 that is measured from the fence side 132 of the second leg 130. When the fence side 132 of the second leg 130 abuts the fence 106 as shown, the third position P3 is also disposed at the third distance D3 from the fence 106.
The cursor 162 includes a first cursor indicator Cl1 that is configured to be positioned at a location on the scale that corresponds with the second distance D2. In an example embodiment, the first cursor indicator Cl1 is a fence-side bitter end of a tab 186 that is part of the scale 160, and the scale 160 overlies the scale 160. In an example embodiment, scale 160 is composed of an opaque material that blocks visual access to a portion of the scale 160 thereunder. Alternately, the first cursor indicator Cl1 may be a pointer or the like. In this example embodiment shown, second distance D2 is 1 5/16 inch, so the first cursor indicator Cl1 is disposed at 1 5/16 inches on the scale 160.
The cursor 162 includes a second cursor indicator Cl21 that is configured to be positioned at a location on the scale that corresponds with the third distance D3. In an example embodiment, the second cursor indicator Cl2 is an outside-side bitter end of the scale 160. In this example embodiment shown, third distance D3 is slightly under 2- 9/16 inches, so the second cursor indicator Cl2 is disposed at slightly under 2 9/16 inches on the scale 160. The cursor 162 may include a second tab (not shown) that extends away from the fence 106 and which includes the second cursor indicator Cl2. The cursor 162 may further include one or more recesses R1, R2 between the first cursor indicator Cl1 and the second cursor indicator Cl2 that is configured to expose at least a portion of the scale 160 between the first cursor indicator Cl1 and the second cursor indicator Cl2 for operator convenience.
The second distance D2 is disposed at an end of a range of distances D2 to D3 that are measured from the fence side 132 of the second leg 130 and that are associated with a location of the center leg 140. The range of distances D2 to D3 associated with the center leg 140 includes at least: 1) a range of distances RCL that are measured from the fence side 132 of the second leg 130 and that are occupied by the center leg 140; 2) a range of distances RSBACL that are measured from the fence side 132 of the second leg 130 and that are occupied by a saw blade allowance 200 that abuts a fence side 142 of the center leg 140; and 3) an optional range of distances ROMC that are measured from the fence side 132 of the second leg 130 and that are occupied by an outside side safety margin 182 that abuts the outside side 144 of the second leg 130.
The saw blade allowance 200 accounts for a thickness of the saw blade 110. This is necessary because the table saw ruler 190 references the nearest point 174 of the saw blade 110, which is disposed on a fence side of the saw blade 110, whereas the center leg 140 is disposed on the other/outside side of the saw blade 110. The tab 186 of the cursor 162 enables the cursor 162 to indicate the second distance D2 on the scale 160 by extending over the scale 160 toward the fence 106 to reach the location on the scale 160 of the nearest point 174 of the saw blade 110. The saw blade allowance 200 can be any suitable size. Common table saw blade thickness range from 1/16 inch to ⅛ inch thick. Consequently, the saw blade allowance 200 may commonly be at least 1/16 inch. In an example embodiment, the saw blade allowance 200 is ⅛ inch plus a suitable (fence side) safety margin. Example suitable safety margins are 1/32 inch or larger.
The range of distances RCL that are measured from the fence side 132 of the second leg 130 and that are occupied by the center leg 140 tells where a width of the center leg 140 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106). Similarly, the range of distances RSBACL that are measured from the fence side 132 of the second leg 130 and that are occupied by the saw blade allowance 200 tells where a width of the saw blade allowance 200 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106). Likewise, the range of distances ROMC that are measured from the fence side 132 of the second leg 130 and that are occupied by the outside side safety margin 182 tells where a width of the outside side safety margin 182 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106).
For example, for a center leg 140 having an example width of 1 1/16 inch, the range of distances RCL measured from the fence side 132 of the second leg 130 would be approximately 1 7/16 inch to 2½ inch. This is because the center leg 140 starts at 1 7/16 inches and extends its 1 1/16 inch width therefrom. For a saw blade allowance 200 having an example width of ⅛ inch, the range of distances RSBACL measured from the fence side 132 of the second leg 130 would be approximately 1 7/16 inch to 1- 5/16 inch. This is because the saw blade allowance 200 starts at 1 7/16 inches (where the fence side 142 of the center leg 140 is located) and extends it's ⅛-inch width toward the second leg 130 (and thereby toward the fence 106). For an outside side safety margin 182 having an example width of 1/16 inch (not shown), the range of distances ROMC measured from the fence side 132 of the second leg 130 would be approximately 2½ inch to 2 5/16 inch. This is because the outside side safety margin 180C starts at 2½ inches (where the outside side 144 of the center leg 140 is located) and extends its 1/16-inch width away from the outside side 144 of the center leg 140.
In such an example embodiment (not shown), the second distance D2 would be 1 5/16 inches because the second distance D2 indicates a fence side end of the range of distances D2 to D3 associated with the center leg 140, and because the range of distances D2 to D3 associated with the center leg 140 includes at least: 1) the range of distances RCL of 1 7/16 inch to 2½ inch, plus 2) the range of distances RSBACL of I- 7/16 inch to 1 5/16 inch, plus 3) the range of distances ROM2 of 2½ inch to 2 5/16 inch. A width of the outside side safety margin 182 can be any suitable size. The third distance D3 would be 2 5/16 inches because the third distance D3 represents an outside end of the range of distances D2 to D3.
In the example embodiment shown, when the saw blade 110 is the second position P2, the distance between the fence 106 and the nearest point 174 of the saw blade 110 is the second distance D2. Since the first cursor indicator Cl1 is disposed at the second distance D2 on the scale 160, an operator who sees the first cursor indicator Cl1 located at the second distance D2 on the scale 160 will know that the cut width setting indicator CWSI cannot be set above the second distance D2 on the table saw ruler 190 when the saw blade 110 is disposed in the second tunnel 154. This safe maximum cut-width position is indicated as a cut width setting indicator second position CWSIP2 on the table saw ruler 190.
Similarly, when the saw blade 110 is the third position P3, the distance between the fence 106 and the nearest point 174 of the saw blade 110 is the third distance D3. Since the second cursor indicator Cl2 is disposed at the third distance D3 on the scale 160, an operator who sees the second cursor indicator Cl2 located at the third distance D3 on the scale 160 will know that the cut width setting indicator CWSI cannot be set below the third distance D3 on the table saw ruler 190 when the saw blade 110 is disposed in the first tunnel 152. This safe minimum cut-width position is indicated as a cut width setting indicator third position CWSIP3 on the table saw ruler 190.
In an example embodiment, the center leg 140 is laterally adjustable. Movement of the center leg 140 will cause the second position P2 and the third position P3 to change. This, in turn, will cause the second distance D2 and the third distance D3 to change. However, the cursor 162 and associated first cursor indicator Cl1 and second cursor indicator Cl2 move with the center leg 140. As a result, the first cursor indicator Cl1 and the second cursor indicator Cl2 will always indicate the second distance D2 and the third distance D3 respectively on the scale 160. The second distance D2 corresponds to the correct safe maximum cut-width position for a saw blade 110 disposed in the second tunnel 154, and the third distance D3 corresponds to the correct safe minimum cut-width position for a saw blade 110 disposed in the first tunnel 152. Consequently, the first cursor indicator Cl1 and the second cursor indicator Cl2 will always indicate the correct safe maximum cut-width position for a saw blade 110 disposed in the second tunnel 154 and the correct safe minimum cut-width position for a saw blade 110 disposed in the first tunnel 152 for any location of the center leg 140.
The fourth position P4 is a safe maximum cut-width position for a saw blade 110 disposed in the first tunnel 152. The fourth position P4 is disposed at a fourth distance D4 that is measured from the fence side 132 of the second leg 130. When the fence side 132 of the second leg 130 abuts the fence 106 as shown, the fourth position P4 is also disposed at the fourth distance D4 from the fence 106. The scale 160 optionally includes a unique second scale indicator SI2 at a location on the scale that corresponds with the fourth distance D4. As used herein, unique means that the identifier is in addition to and distinguishable from the ruler markings on the scale.
The fourth distance D4 is disposed at a fence end of a range of distances D4 to D5 that are measured from the fence side 132 of the second leg 130 and that are associated with a location of the first leg 120. The range of distances D4 to D5 associated with the first leg 120 includes at least: 1) a range of distances RFL that are measured from the fence side 132 of the second leg 130 and that are occupied by the first leg 120; and 2) a range of distances RSBAFL that are measured from the fence side 132 of the second leg 130 and that are occupied by a saw blade allowance 202 that abuts a fence side 122 of the first leg 120. Similar to the saw blade allowance 200, the saw blade allowance 202 accounts for a thickness of the saw blade 110. The saw blade allowance 200 and 202 may or may not be the same as each other.
The range of distances RFL that are measured from the fence side 132 of the second leg 130 and that are occupied by the first leg 120 tells where a width of the first leg 120 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106). Similarly, the range of distances RSBAFL that are measured from the fence side 132 of the second leg 130 and that are occupied by the saw blade allowance 202 tells where a width of the saw blade allowance 202 is located relative to the fence side 132 of the second leg 130 (and thereby relative to the fence 106).
For example, for a first leg 120 having an example width of ½ inch, the range of distances RFL measured from the fence side 132 of the second leg 130 would be 3⅛ inch to approximately 3⅝ inch. This is because the first leg 120 starts at 3⅛ inches and extends its ½-inch width therefrom. For a saw blade allowance 202 having an example width of ⅛ inch, the range of distances RSBAFL measured from the fence side 132 of the second leg 130 would be approximately 3 inches to 3⅛ inches. This is because the saw blade allowance 202 starts at approximately 3⅛ inches (where the fence side 122 of the first leg 120 is located) and extends it's ⅛-inch width toward the second leg 130 (and thereby toward the fence 106).
In such an example embodiment, the fourth distance D4 would be 3 inches because the fourth distance D4 indicates a fence end of the range of distances D4 to D5 associated with the first leg 120, and because the range of distances D4 to D5 associated with the first leg 120 includes at least: 1) the range of distances RFL of 3⅛ inches to approximately 3⅝ inches plus 2) the range of distances RSBAFL of 3⅛ inches to three (3) inches.
In the example embodiment shown, when the saw blade 110 is the fourth position P4, the distance between the fence 106 and the nearest point 174 of the saw blade 110 is the fourth distance D4. Since the second scale indicator SI2 is disposed at the fourth distance D4 on the scale 160, an operator who sees the second scale indicator SI2 located at the fourth distance D4 on the scale 160 will know that the cut width setting indicator CWSI cannot be set above the fourth distance D4 on the table saw ruler 190 when the saw blade 110 is disposed in the first tunnel 152. This safe maximum cut-width position is indicated as a cut width setting indicator second position CWSIP4 on the table saw ruler 190.
In an example embodiment, the scale 160 could be extended to the outside side 124 of the first leg 120 and could include a third scale indicator SI3 (not shown) that would indicate the fifth distance D5 and a corresponding safe minimum cut-width position for a saw blade 110 disposed laterally outside/astride the push block 102. An operator who sees the third scale indicator located at the fifth distance D5 on the scale 160 would know that the cut width setting indicator CWSI cannot be set below the fifth distance D5 on the table saw ruler 190 when the saw blade 110 is disposed laterally outside the push block 102. This safe minimum cut-width position is optionally indicated as a cut width setting indicator fifth position CWSIPS on the table saw ruler 190. As with the first distance D1 and the second distance D3, an optional outside safety margin (not shown) could be included added to the range D4 tO D5 and thereby be accounted for by the fifth distance D5.
Also just like in
The saw blade 110 is located at a selected distance Dselected from the fence 106. An operator can see the cut width setting indicator CWSI is correspondingly located at approximately one (1) inch on the table saw ruler 190. The operator can also see on the scale 160 that one (1) inch is safely above the first scale indicator S11. Since the first scale indicator SI1 indicates the safe minimum cut-width position for a saw blade 110 disposed in the second tunnel 154, this means that the saw blade 110 will not contact the second leg 130 during a cutting operation. The operator can also see on the scale 160 that one (1) inch is safely below the first cursor indicator Cl1. Since the first cursor indicator Cl1 indicates the safe maximum cut-width position for a saw blade 110 disposed in the second tunnel 154, this means that the saw blade 110 will not contact the center leg 140 during a cutting operation.
Also like that in
The saw blade 110 is located at a selected distance Dselected from the fence 106. An operator can see the cut width setting indicator CWSI is correspondingly located at approximately 2⅛ inch on the table saw ruler 190. The operator can also see that 2⅛ inch on the scale 160 is safely above the second cursor indicator Cl2. Since the second cursor indicator Cl2 indicates the safe minimum cut-width position for a saw blade 110 disposed in the first tunnel 152, this means that the saw blade 110 will not contact the center leg 140 during a cutting operation. The operator can also see that the 2⅛ inch on the scale 160 is safely below the second scale indicator SI2. Since the second scale indicator SI2 indicates the safe maximum cut-width position for a saw blade 110 disposed in the first tunnel 152, this means that the saw blade 110 will not contact the first leg 120 during a cutting operation.
The saw blade 110 is located at a selected distance Dselected from the fence 106. An operator can see the cut width setting indicator CWSI is located at approximately 2 inches on the table saw ruler 190. The operator can see that 2 inches on the scale 160 is not safely below the first cursor indicator Cl1. Since the first cursor indicator Cl1 indicates the safe maximum cut-width position for a saw blade 110 disposed in the second tunnel 154, this means that the saw blade 110 will not be safely disposed in the second tunnel 154 during a cutting operation. The operator can also see that 2 inches on the scale 160 is not safely above the second cursor indicator Cl2. Since the second cursor indicator Cl2 indicates the safe minimum cut-width position for a saw blade 110 disposed in the first tunnel 152, this means that the saw blade 110 will also not be safely disposed in the first tunnel 152 during a cutting operation. Since the cut width setting indicator CWSI indicates a position that is both above the safe maximum cut-width position for a saw blade 110 disposed in the second tunnel 154 and below the safe minimum cut-width position for a saw blade 110 disposed in the first tunnel 152, the operator will understand that the saw blade 110 will contact the center leg 140 in this configuration.
In the example embodiment shown, the operator can simply see that the cut width setting indicator CWSI is correspondingly located between the first cursor indicator Cl1 and the second cursor indicator Cl2, which means the saw blade 110 will contact the center leg 140. In the example embodiment shown, the cursor 162 is composed of an opaque material that blocks visual access to the scale indicators on the scale 160 and under the cursor 162. Consequently, the operator would not be able to see the 2-inch indicator on the scale 160, which would mean that the saw blade 110 would contact the center leg 140. Example damage resulting from pushing the push block 102 over the saw blade 110 in this configuration is visible in the center leg 140.
The apparatus disclosed herein provides a visual reference that allows an operator to quickly assess proper settings and avoid equipment damage before a cutting operation without having to make any calculations or use any measuring devices. Consequently, the disclosed apparatus represents an improvement in the art.
While various embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, swapping of features among embodiments, changes, and substitutions may be made without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.
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