This invention relates to a two plane protractor and display device and, more particularly, to a device intended primarily for use in determining and displaying miter and bevel angles needed to install adjoining pieces of molding and trim in crown molding and similar applications.
Crown molding and other types of decorative molding and trim can be extremely difficult, tedious and frustrating to install. Precisely mitered and beveled angles are typically required where adjoining pieces of molding or trim meet at inside and outside corners of adjacent walls. Forming these angles, especially when crown molding is involved, requires that complex cuts be made in the adjoining pieces of molding typically using a compound miter saw. Wall and spring angles must be measured, bevel and miter measurements calculated and the installer's saw precisely adjusted to achieve an accurate fit, This is traditionally a tedious, time consuming and highly unreliable process. Oftentimes, the installer uses trial and error, which can result in uneven and unattractive joints in the molding. Time and expense can be wasted attempting to correct poor results and many times a desired neat and attractive appearance is never achieved.
Precalculated crown molding tables and software have been developed to assist the installer and facilitate the molding installation process. Nonetheless, using such resources remains a time consuming, tedious and often inaccurate process. The results are still apt to be unsatisfactory particularly if an inexperienced installer is involved,
Recently, protractors have been developed for measuring wall angles and spring angles, which are needed in order to derive miter and bevel angle adjustments for the installer's saw. See Boutan, U.S. Pat. No. 7,574,813. A need exists for an improved two plane molding protractor wherein the wall and spring angle adjustments can be made even more precisely, quickly, accurately, and efficiently. A particular need exists for a protractor display that intuitively and graphically conveys to the installer pertinent information regarding calculated bevel and miter angles and related saw cut adjustment and positioning required in the molding installation process.
It is therefore an object of the present invention to provide a two plane protractor and display mechanism for quickly, conveniently and efficiently determining proper miter and bevel angles required for installing adjoining pieces of molding and trim in crown molding and related applications.
It is a further object of this invention to provide a two plane protractor that employs a much more precise and mechanically effective geared operation that enables significantly improved wall and spring angle measurements to be taken in virtually any environment requiring corner molding installation.
It is a further object of this invention to provide a two plane protractor mechanism employing wall angle measurement arms that are operably interconnected through a gear mechanism that allows the arms to adjust in unison rather than independently so that measuring wall angles may be accomplished more evenly and quickly.
It is a further object of this invention to provide a two plane protractor that likewise operably interconnects a pair of spring angle measurement arms through a gear mechanism that allows those arms to operate in unison and thus more efficiently.
It is a further object of this invention to provide a significantly improved display for a crown molding and trim protractor featuring intuitive, easy to read and understand and extremely accurate digital and graphic representations that effectively convey measured and calculated information and suggested trim positioning to the user so that cut angles are more accurately formed and the molding and trim installation is facilitated.
It is a further object of this invention to provide a protractor that allows both wall angles and spring angles to be measured much more quickly and accurately than has been previously possible.
It is a further object of this invention of a protractor and display that operates effectively in two planes or degrees of freedom and which obtains measurements simultaneously in both planes without having to perform separate measurements.
This invention features a two plane protractor and display device for use in combination with a pair of trim pieces to determine miter and bevel angles for installing adjoining pieces of molding and trim. The device includes a base and a pair of opposing wall angle measurement arms mounted to the base and pivotally interconnected to each other through operatively interengaged gears that allow the wall angle measurement arms to pivot in unison relative to one another in a first degree of freedom. A pair of spring angle measurement arms are mounted respectively to the wall angle measurement arms. Each spring angle measurement arm rotates in a second degree of freedom about a longitudinal axis of a respective wall measurement arm. The spring angle measurement arms are respectively attachable to and supportive of the trim pieces. A first sensor measures the angular displacement between the wall angle measurement arms, which yields a wall angle measurement. A second sensor measures rotational displacement of at least one spring angle measurement arm about the longitudinal axis of the wall angle measurement arm to which the spring angle measurement arm is mounted. A microprocessor calculates bevel and miter angles based upon the measured wall and spring angles. An electronic display is communicably connected to the sensors and the microprocessor for displaying the measured wall and spring angles and the calculated bevel and miter angles.
In a preferred embodiment, the gear assembly includes a pair of gear assembly support shafts mounted to the base and a pair of operatively engaged pivot transfer gears respectively supported by the gear assembly support shafts. The pivot transfer gears are respectively fixedly attached to the wall angle measurement arms for selectively rotating in opposing directions on the base to angularly adjust the wall angle measurement arms.
Each spring angle measurement arm may include teeth for biting into a respective trim piece held by the spring angle measurement arm and restricting relative movement between the trim piece and the spring angle measurement arm holding the trim piece. Each spring angle measurement arm may carry a curved guide slot that is engaged by a guide pin for guiding rotational movement of the spring angle measurement arm. Each spring angle measurement arm may be selectively gripped by a locking mechanism supported by the wall angle measurement arm to which the spring angle measurement arm is attached. This holds the spring angle measurement arm at a selected rotational tilt relative to the attached wall angle measurement arm.
The first sensor may be attached to the base and an associated one of the gear support shafts may be fixedly connected to a respective pivot transfer gear that is rotatably mounted in the base. The first sensor may be responsive to rotation of that associated gear support shaft for measuring the angular displacement of the wall angle measurement arms.
A first wall angle measurement arm may include an axially shaft for supporting a respective first said spring angle measurement arm. The first spring angle measurement arm may be fixed to the axially rotatable shaft so that the shaft axially rotates when the first spring angle measurement arm rotationally tilts. In such versions, the second sensor may be carried by a first wall angle measurement arm and be responsive to axial rotation of the shaft for measuring rotational tilt of the first spring angle measurement arm.
The gear assembly may further include a tilt angle transfer gear portion operatively interconnecting the spring angle measurement arms such that angular rotations of one of the spring angle measurement arms is transmitted to the other spring angle to angularly rotate the spring angle measurement arms in unison. The tilt angle transfer gear portion may further include a first operatively interengaged pair of tilt transfer spur gears, each supported by a respective gear support shaft and above a respective pivot transfer gear and being rotatable relative to said respective pivot transfer gear. The tilt angle transfer gear portion may further include a first pair of operatively interengaged bevel gears for transmitting rotational tilt from one of the spring angle measurement arms to one of the tilt transfer spur gears. A second pair of operatively engaged bevel gears may be provided for transmitting rotational tilt from the other of the spring angle measurement arms to the other tilt transfer spur gear. As a result, the interengaged tilt transfer spur gears rotate in opposite directions and the tilt measurement arms tilt in unison. The base may include a housing for enclosing the gear assembly.
One or both of the sensors may include capacitive sensor disks for detecting the pivotal and rotational movement of the respective angle measurement arms. Alternative sensors such as solid state, resistance, LED or light sensors may also be employed.
This invention also features a display for a two plane protractor device. In particular, the display includes a graphic depiction of a piece of trim to be cut as well as graphic icons and digital representations of the bevel and miter angle calculations and the suggested placement of a trim piece to the cut on a compound miter saw. Preferably, the digital indications of calculated miter and bevel angles are depicted simultaneously with the graphic icons simulating a trim piece to be cut and suggested placement of that piece on the compound miter saw.
In a preferred embodiment, the display may depict graphic icons selectively simulating left hand and right hand pieces of trim and simultaneously depicting calculated bevel and miter angles numerically and digitally. The display may depict graphic icons and calculated angles selectively for “bevel left” and “dual bevel” compound miter saw applications. The display may be actuated for graphically depicting suggested placement of a piece of trim to be cut on a compound miter saw. Specifically, the display may include non-numerical graphic icons representing a piece of trim and recommended placement of the trim against a fence of a compound miter saw. The display may be operated to selectively depict graphic representations of right hand and left hand pieces of trim. A calibration button may be manually engaged for at least a predetermined time for calibrating the first and second sensors. The calibration button may be momentarily toggled after the first and second sensors are calibrated to selectively alternate between bevel left and dual bevel calculations represented on the display. Buttons may be provided for holding calculated miter and bevel calculations and related graphic representations for right hand and left hand trim pieces respectively, at least while the display remains activated.
Other objects, features and advantages will occur from the following description of a preferred embodiment and the accompanying drawings, in which:
There is shown in
As shown in
As further shown in
Arms 22 and 24 as well as integral gears 26 and 28 are fixedly interconnected to respective pivot shafts 18 and 20. In certain embodiments shaft 18 may be fixedly interconnected between base plate 12 and display module 14 and gear 26 may be rotatably mounted on shaft 18. In any event, both wall angle measurement arms are pivotable on the base. The upper stem 21 of pivot shaft 20 is operatively interengaged in a conventional manner with a first capacitive disk sensor 31, best shown in
A pair of spring angle measurement arms 34 and 36 are shown in
Shaft 40 allows spring angle measurement arm 34 to be rotated or tilted in a second degree of freedom as generally shown by double headed arrow 50. As further shown in
More particularly, arm 34 is fixedly attached to tilt sensor shaft 42 so that, as arm 34 rotates relative to the longitudinal axis of arm 22, shaft 42 axially rotates within arm 22. The inner end of shaft 42 is operatively interengaged with a rotating disk 45 of a capacitive disk sensor 46, again in a manner know in the sensor art. A second, spaced apart capacitive disk 47 is mounted in chamber 48 in operative relationship with disk 45. Accordingly, rotation of the inner end of shaft 42 causes the equivalent rotation or tilt of arm 34 to be measured by sensor 46. This represents the spring angle measured by the device.
Spring angle measurement arm 36 and the wall angle measurement arm 24 to which it is attached are themselves operatively interconnected in a manner generally similar to that previously described for wall angle measurement arm 22 And spring angle measurement arm 34. Typically, the only significant difference is that a sensor is omitted from disk-shaped chamber 58 of arm 24. See
As best shown in
After trim pieces T1 and T2 are secured to spring angle measurement arms 34 and 36 respectively, protractor 10 may be operated to measure the wall angle and spring angle involved in a particular crown molding installation. Locking knobs 56 are loosened and protractor 10 is engaged with the inside or outside wall corner such that trim pieces T1 and T2 fit properly against respective walls and the ceiling at the corner. The wall angle measurement arms adjust angularly in unison to reflect the wall angle being measured. The geared interengagement between the arms 22 and 24 enables the protractor to be angularly adjusted in a easy, quick and efficient manner, with the arms moving in unison rather than individually and separately. The spring angle measurement arms are also tilted so that trim pieces T1 and T2 fit properly against the ceiling and the respective walls in a manner analogous to the crown molding that will be eventually installed. When this position is achieved, knobs 56 are tightened. When the wall and spring angle measurement arms have been set in the foregoing manner, the display module of the protractor is operated to display the measured wall and spring angle measurements and to calculate required bevel and miter angles in the manner described below.
In alternative embodiments, different numbers and arrangements of wall and spring angle sensors may be employed in protractor 10 in order to achieve required levels of accuracy. For example, instead of the single wall angle sensor 31 and single spring angle sensor 46 shown in the version in
The alternative embodiment shown in
As shown in
Protractor 110 again includes opposing wall angle measurement arms 122 and 124. Each such arm includes an interior channel 221,
As best shown by the representative wall angle measurement arm 122 in
Wall angle measurement arms 122 and 124 respectively interengage pivot sensor shafts 118 and 120 so that the respective spur gears 126 remain operatively interengaged and the arms 122 and 124 are mounted pivotally to the base.
Spur gear 126 of wall angle measurement arm 122 is loosely or rotatably mounted to spring angle sensor shaft 118. See
The gear assembly further includes a tilt transfer gear portion including a pair of operatively interengaged tilt transfer gears 180 and 182 that are mounted on shafts 118 and 120, respectively. A representative tilt transfer gear is depicted in
The tilt transfer gear 180 is fixedly attached to spring angle sensor shaft 118 as shown in
As shown in
The spring arms are again provided with depending points or teeth that facilitate gripping respective trim pieces T3 and T4,
In operation, protractor 110, with trim pieces T3 and T4 attached, is fitted against a ceiling and adjoining walls of a corner. The wall angle measurement arms 134 and 136 are angularly adjusted in accordance with the angle between the adjoining walls. Either arm may be moved and the interengaged spur gears 126 cause both arms 122 and 124 to pivot in unison. The spur gear 126 of arm 122 floats freely about the spring angle sensor shaft 118 to which it is mounted and spur gear 126 of arm 124 rotates fixedly attached wall angle sensor shaft 120, which, in turn, operates sensor 131 to measure the wall angle.
As in the prior embodiment, the spring arms 134 and 136 are rotated relative to the wall angle measurement arms in order to fit the trim pieces T3 and T4 against the ceiling and respective adjoining walls so that a spring angle may be accurately measured. In this version, however, both spring arms tilt or rotate in unison. For example, if trim piece T3 and attached spring arm 134 are angularly tilted, this causes attached tilt shaft 142 to rotate its attached horizontal bevel 185. In turn, the interengaged vertical bevel 184 of tilt transfer gear 180 turns. This drives integrally attached spur gear 183 in a like direction. The operatively interengaged spur gear 183 of second tilt transfer gear 182 rotates in an opposite direction. See
In the second version of this invention, wall and spring angle measurements are facilitated because each pair of arms operates in unison. This simplifies and expedites the installer's task and makes it much easier and more convenient to measure wall and spring angles.
Protractors 10, 110 employ a display module featuring various electrical/electronic components to measure the wall and spring angles and calculate required miter and bevel angles to which the compound miter saw should be set.
Referring to
ON/OFF button 205 is pressed to activate the electronic components of protractor device 14, 114. Pressing and holding button 205 turns off the device. Each time the display module is activated by pressing ON/OFF button 205, the wall and spring angles measured by the protractor are displayed numerically and digitally as is shown in
HOLD LEFT button 207 and HOLD RIGHT button 208 are respectively pressed to calculate miter and bevel angles for left hand and right hand trim pieces respectively. After the protractor is set against a ceiling and pair of adjoining corner walls, as previously described, buttons 207 and 208 are selectively pressed so that processor 201 calculates the proper miter and bevel angles to which the compound miter saw should be set for left and right trim pieces respectively. For each measurement, button 206 should be pressed to set the display module to either DUAL BEVEL or BEVEL LEFT as appropriate.
Processor 201 is also programmed to graphically represent the suggested compound miter saw cutting orientation for the specific trim piece to be cut. For example, after the protractor measurements are taken as previously described, the HOLD RIGHT button 208 may be pressed as shown in
After the miter and bevel angles are calculated and a suggested trim placement orientation is depicted, the HOLD RIGHT and HOLD LEFT buttons 208 and 207 respectively may be selected. The calculated information is retained for further use within the module until the module is subsequently deactivated. Alternatively, by pressing both buttons 207 and 208 simultaneously, the microprocessor returns the display screen to the measurement mode depicted in
In operation, button 205 is pressed to turn on the display and enter the measuring mode. Protractor 10, 110 is then calibrated by loosening the lock knobs 56, 156, rotating the display module such that it faces upwardly and extending the wall angle measurement arms 22, 24 and 122, 124 so that the backs of trim pieces T1-T4 lie flat on a flat surface. The wall angle measurement arms should be angularly adjusted using a standard mechanical angle gauge so that they are held 90° apart. Keeping the trim pieces flat and at 90° to one another, the user presses and holds the CAL button 206 to set the values displayed on screen 203 to 90.0° spring angle and 90.0° wall angle. The screen display is in the mode shown in
Next, the bevel function is selected. There are two types of compound miter saws. Dual bevel saws tilt both left and right. Single bevel saws tilt only to the left. Selecting DUAL BEVEL will enable the display to graphically show the cut orientation used for tilting the saw both directions. Selecting BEVEL LEFT shows the orientation used for tilting the saw only to the left. This setting can be changed any time without affecting the other settings simply by toggling button 206 to select the pertinent bevel function. The actual bevel and miter angles calculated and displayed do not change and are the same for both functional settings.
The protractor 10, 110 is then fit against the ceiling and adjoining corner walls in the manner previously described. Display module 14 is rotated so that screen 203 faces downwardly or is otherwise clearly visible to the wearer. Holding the trim pieces T1-T4 firmly and properly fit against the ceiling and adjoining walls and with the display module activated, the spring and wall angles are depicted, for example, as shown in
Representative details that may be graphically or digitally/numerically displayed on screen 203 when either of buttons 207 or 208 is engaged (in this case button 208) are shown in
The protractor and display device may be constructed using various materials conventionally used in tools, gauges and instruments employed in woodworking, carpentry and similar fields. Lightweight, yet durable metals, metal alloys and plastics are especially preferred.
The present invention enables wall and spring angles to be quickly, conveniently and accurately measured and further allows the carpenter or other, even less experienced installer to form even, smooth and precise installations of trim and molding. The time and tedium associated with conventional techniques is greatly reduced and the trim installation process is facilitated considerably.
Although specific features of the invention are shown in some of the drawings and not others, this is for convenience only, as each of the features may be combined with any and all of the other features in accordance with this invention.
Other embodiments will occur to those skilled in the art and are within the following claims:
This application claims the benefit of U.S. Provisional Patent Application No. 62/070,503 filed Aug. 27, 2014.
Number | Date | Country | |
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62070503 | Aug 2014 | US |