# Patent

## Title
Apparatus for planter depth monitoring

## Abstract

A seed planting assembly comprising a laterally extending support member and a planting unit including a planting frame supported by said support member. Said planting unit frame carries, a seed trench opening assembly operable to create a seed trench in a ground surface, a depth regulating member having a vertical position relative to said seed trench opening assembly, wherein said depth regulating member responds to forces upon said planting unit to control ground surface engagement, an arm assembly connecting said depth regulating member to said planting unit frame with a depth monitoring means for indicating whether said depth regulating member is fully engaged with said ground surface wherein said depth monitoring means indicates whether said arm assembly is engaged with said stop means.

## Background
FIELD OF THE INVENTION
The apparatus described herein is generally applicable to the field of agricultural equipment. The embodiments shown and described herein are more particularly for improved delivery of seed to a furrow as used with seed planter row units.
CROSS REFERENCE TO RELATED APPLICATIONS
The non-provisional patent application entitled “Method for Planter Depth Monitoring” and assigned Ser. No. 11/486,728 is filed concurrently with this non-provisional patent application and is incorporated by reference herein.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
No federal funds were used to develop or create the invention disclosed and described in the patent application.
REFERENCE TO SEQUENCE LISTING, A TABLE, OR A COMPUTER PROGRAM LISTING COMPACT DISK APPENDIX
Not Applicable



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 provides a side view of one embodiment of a row planter unit. FIG. 2 provides a rear view of one embodiment of a furrow opening device with a depth regulation device.
FIG. 3 provides a closer view of one embodiment of the depth monitoring apparatus engaged with one embodiment of a row planter unit.
FIG. 4 provides a blow-up of one embodiment of a planter unit shank assembly.
FIG. 5 provides a close view of one embodiment of the depth monitoring apparatus disengaged from a row planter unit.
FIG. 6A provides a cross-sectional view of one embodiment of the depth monitoring apparatus with the switch open.
FIG. 6B provides a cross-sectional view of one embodiment of the depth monitoring apparatus with the switch closed.
FIG. 7 provides a prospective view of one embodiment of the depth monitoring apparatus engaged with one embodiment of a row planter unit.
FIG. 8 provides a side view of another embodiment of a row planter unit.
FIG. 9 provides a more detailed side view of another embodiment of a row planter unit.
FIG. 10 provides a rear view of another embodiment of a row planter unit.
FIG. 11 provides a top view of another embodiment of a row planter unit.
FIG. 12 provides a top view of one embodiment of the depth regulating means engaged.
FIG. 12A provides a cross-sectional view of the depth monitoring means indicating furrow penetration to a desired depth with depth regulating means engaged.
FIG. 13 provides a top view of the embodiment as shown at FIG. 12 with the depth regulating means non-engaged.
FIG. 13A provides a cross-sectional view of the depth monitoring means indicating failure to achieve furrow penetration to a desired depth with depth regulating means non-engaged.













DETAILED DESCRIPTION - LISTING OF ELEMENTS










Element Description
Element Number














Lateral Support Member
1



Planting Unit
2



Planting Unit Frame
3



Furrow Opening Assembly
4



Ground Surface
5



Seed Delivery Assembly
6



Furrow Closing Assembly
7



Gauge Wheel
8



Pivoting Arm Assembly
9



Stop
10



Intentionally Blank
11



Intentionally Blank
12



Intentionally Blank
13



Contact Switch
14



Saddle Link
15



Gauge Wheel Arm Pivot
16



Parallel Linkage
17



Gauge Wheel Rotation Axis
18



Intentionally Blank
19



Intentionally Blank
20



Rocker
21



End Bolt
22



Side Bolt
23



Yoke Link
24



Spring Loaded Plunger
25



Contacts
26



Intentionally blank
27



Furrow
28



Switch Cavity
29



Wire
30



Rack
31



Depth Adjustment Slots
32










DETAILED DESCRIPTION OF INVENTION
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, FIG. 1 shows a lateral support member 1 of a seed planting assembly with a planting unit 2 attached to said lateral support member 1 via parallel linkage 17, which is one means of attaching a planting unit 2 to the lateral support member 1 as recited in the claims. The planting unit 2 includes a furrow opening assembly 4, a planting unit frame 3, a pivoting arm assembly 9 with a gauge wheel 8 rotatably attached at one end, a seed delivery assembly 6 and a furrow closing assembly 7. The seed planting assembly shown in FIGS. 1, 2,3,4 and 7 of the type disclosed in U.S. Pat. No. 5,427,038, “Adjustable Gauge Wheel for a Planter” issued to Ege (hereinafter Ege), which is incorporated by reference herein and well known to those skilled in the art. The seed planting assembly shown in FIGS. 8, 9, 10, 11 and 12 is similar to that disclosed in U.S. Pat. No. 6,148,747, “Equalizing Gauge Wheel Mechanism for Row Crop Planter” issued to Deckler et al. (hereinafter referred to as Deckler), which is also incorporated by reference herein and also well known to those skilled in the art. The present art is shown in combination with the prior art in FIGS. 10, 11 and 12. The embodiment disclosed in Deckler also generally includes a furrow opening assembly 4, a planting unit frame 3, a pivoting arm assembly 9 with a gauge wheel 8 rotatably attached at one end, a seed delivery assembly 6 and a furrow closing assembly 7. The present invention may be applied to existing seed planting assemblies with any number of planting units 2 attached to the lateral support member 1. Accordingly, the scope of the present invention is not limited by the number of planting units 2 engaged with the lateral support member 1 of the seed planting assembly. In the embodiments described and disclosed herein, a double disc opener is shown as one type of furrow forming means as recited in the claims, and selection of alternate furrow forming means in no way limits the scope of the current invention.
FIG. 3 shows a close-up view of one embodiment of the depth monitoring apparatus in combination with Ege. In FIG. 3, the depth monitoring apparatus is comprised of a contact switch 14 with a spring loaded plunger 25 mounted to the stop 10. The spring loaded plunger communicates with a rocker 21 in which the hole has been slotted. The rocker 21 is mounted on the stop 10 via the end bolt 22 and provides the limit for upward movement of the pivoting arm assembly 9 with respect to the other elements of the planting unit 2. The stop 24 is mounted to the planting unit frame 3 via the side bolt 23. The rocker 21 in combination with the stop 10 is one type of stop means as recited in the claims. This type of stop means is a type of equalization means, as is well known to those skilled in the art, which allows for a certain amount of vertical travel of one pivoting arm assembly 9 with respect to the other pivoting arm assembly 9 associated with the planting unit 2. As is shown in FIG. 2, the furrow opening assembly 4 in this embodiment is typically positioned between a pair of gauge wheels 8, wherein each gauge wheel 8 communicates with the planting unit 2 via a pivoting arm assembly 9. In FIG. 5 the rocker 21 and stop 10 are shown in combination with a contact switch 14, which together are one type of depth monitoring or indicating means as recited in the claims.
In the embodiment shown in FIG. 5, the bolt hole in the rocker 21 has been elongated so that the rocker 21 may move in a vertical transverse relation to the axial direction of the end bolt 22. The bolt hole in the rocker 21 is elongated by such an amount (in the embodiment shown in FIGS. 6A, 6B and 7 it is elongated by one eighth of an inch) such that movement of the rocker 21 by the amount of elongation is sufficient to actuate a typical electrical contact switch 14. In FIG. 6A, the rocker 21 is fully engaged with the pivoting arm assembly 9, which subsequently positions the bottom of the elongated hole in the rocker 21 against the bottom of the end bolt 22 and the top outer surface of the rocker 21 against the spring loaded plunger 25, which opens the contact switch 14 and keeps the contacts 26 separated so that the circuit is open. In FIG. 6B, the rocker 21 is not fully engaged with the pivoting arm assembly 9, in which case the spring loaded plunger 25 in combination with gravity subsequently positions the top of the elongated hole in the rocker 21 against the top of the end bolt 22. The top outer surface of the rocker 21 is acted upon by the spring loaded plunger 25, which allows the contacts 26 to close, thus completing a circuit (not shown) of which contact switch 14 may be a part. In this way, the depth monitoring apparatus is able to detect when the desired vertical relation between the furrow opening assembly 4 and the gauge wheel 8 is not maintained, which indicates that the furrow opening assembly 4 is not penetrating the ground surface 5 to the desired depth.
In the embodiment shown in FIG. 7, a gauge wheel 8 is used as a depth regulation means, but a gauge wheel 8 is merely one type of depth regulation means as recited in the claims. In the embodiment shown in FIG. 7, the gauge wheel 8 is rotatable around the gauge wheel rotation axis 18. The pivoting arm assembly 9 is pivotably engaged with the planter unit frame 3 at the gauge wheel arm pivot 16. The operator is able to adjust the vertical relation between the furrow opening assembly 4 and the gauge wheel 8 by setting the position of the stop 10, thereby controlling the degree of penetration of the furrow opening assembly 4 into the ground surface 5. Adjusting the position of the stop 10 determines the maximum vertical position of the gauge wheels 8 with respect to the furrow opening assembly 4 because the stop 10 and rocker 21 define the limit for vertical movement of the pivoting arm assembly 9 with respect to the furrow opening assembly 4 as well as the other elements of the planting unit 2.
When the gauge wheel 8 is fully engaged with the ground surface 5 (as represented by FIG. 6A), the pivoting arm assembly 9 is engaged with the rocker 21. When the gauge wheel 8 is not fully engaged with the ground surface 5 (as represented by FIG. 6B), the gauge wheel is allowed to drop in vertical relation with respect to the furrow opening assembly 4 and the other elements of the planting unit 2, and the rocker 21 is no longer engaged with the spring loaded plunger 25. Subsequently, the vertical relation between the furrow opening assembly 4 and the gauge wheels 8 is less than that which was set by the operator and the contacts 26 in the contact switch 14 are allowed to communicate. In this embodiment, the depth monitoring apparatus detects whether the pivoting arm assembly 9 is fully engaged with the rocker 21, thereby detecting whether the furrow opening assembly 4 is penetrating the ground surface 5 to the furrow 28 depth set by the operator. The resulting information can be relayed to the seed planting assembly operator, as is well known to those skilled in the art, by transmission means, such as electrical conduit, wireless transmitters using radio frequencies, which may be blue tooth enabled, microwave frequencies or other means as recited in the claims, to a display accessible to the seed planting assembly operator. Visual sensory means, such as lights, are another type of sensory means which may be used to alert the operator that the furrow opening assembly 4 is not penetrating the ground surface 5 as recited in the claims.
The operation of the embodiment shown in FIGS. 8-13 is similar to the depth monitoring apparatus in the embodiments previously shown in FIGS. 1-7. In the embodiment shown in FIGS. 8-13, the pivoting arm assembly 9 is also pivotably engaged with the planting unit frame 3, and the depth to which the furrow opening assembly 4 is allowed to penetrate the ground surface 5 is again adjustable by the operator and dictated by the relative vertical position between the furrow opening means 4 and the gauge wheels 8. The relative vertical position of the gauge wheels 8 with respect to the furrow opening assembly 4 when the gauge wheels 8 are fully engaged with the ground surface 5 is indicated by the engagement of the saddle link 15 with the yoke link 24. The saddle link 15 is one type of equalizing arm to allow for a certain degree of independent vertical motion between two gauge wheels 8, which may be used alone or in pairs, as is well known to those skilled in the art and as further illustrated by the rear view shown in FIG. 10. The combination of the saddle link 15 and the yoke link 24 is one type of stop means as recited in the claims. FIG. 11 provides a top view of the saddle link 15 engaged with the yoke link 24 in relation to rack 31 and depth adjustment slots 32 which are partially shown without a depth monitoring indicating means installed therein to illustrate the existing relationship between the elements of the prior art. One embodiment of the present art as disclosed and claimed herein is illustrated in FIG. 12, FIG. 12A, FIG. 13 and FIG. 13A. As illustrated in the preceding figures, the present art may be cooperatively engaged with depth adjustment and regulating means of the prior art.
FIG. 12 illustrates the condition wherein the pivoting arm assembly 9 of the depth regulating means are “up” indicating the furrowing opening assembly 4 is penetrating the ground surface 5 to the set depth. The depth monitoring means as employed is a switch 14 integrated into switch cavity 29 formed in the saddle link 15. As illustrated in FIG. 12A, the switch 14 is depressed when the saddle link 15 is engaged with yoke link 24. As illustrated in FIG. 12 and FIG. 12A, the spring loaded plunger 25, shaped as a clamshell in this embodiment for engagement with the yoke link 24, is actuated and contacts 26 of switch 14 are open. In this condition, the open switch 14 does not complete the circuit (not shown) and does not allow transmission of a signal through wire 30.
FIG. 13 illustrates the condition wherein the depth regulating means, having pivoting arm assembly 9, is “down” indicating the furrowing opening assembly 4 is not penetrating the ground surface 5 to the desired or set furrow 28 depth. The depth monitoring means as employed is again a switch 14 integrated into switch cavity 29 which is formed in saddle link 15. As illustrated in FIG. 13A, the switch 14 is not depressed when the saddle link 15 is not engaged with yoke link 24. As illustrated in FIG. 13 and FIG. 13A, the spring loaded plunger 25 is not actuated and contacts 26 of switch 14 are closed. In this condition, the closed switch 14 will complete the circuit (not shown) and allow transmission of a signal through wire 30.
Although not shown, it will be apparent to those skilled in the arts that a limit switch may also be used in combination with the stop and depth regulating means for depth monitoring or indication. In this embodiment, the target portion of the limit switch would be mounted to the stop means and a switch activator mounted to the depth regulating means, wherein said depth monitor or indicator means would be actuated by physical contact between the target and switch activator portions of the limit switch. In another embodiment, not shown, the target portion of the limit switch would be mounted to the depth regulating means and a switch activator mounted to the stop means, wherein said depth monitor or indicator means would be actuated by physical contact between the target and switch activator portions of the limit switch.
The scope of the current invention is not limited by the choice of switch, switch types or number of switches employed to detect differences in the vertical relation between the furrow opening means 4 and the gauge wheels 8 in any of the embodiments. Any other detection means or technology, such as a mechanical device, an electromechanical device, electro-photo device or any combinations thereof, may be used as a depth monitoring or indicating means as recited in the claims.
As with the previously described embodiment, when the gauge wheels 8 are not fully engaged with the ground surface 5, the furrow opening assembly 4 is not penetrating the ground surface 5 to the desired depth and the gauge wheels 8 are allowed to assume a lower vertical relation with respect to the other elements of the planting unit 2, which subsequently changes the relative vertical position of the gauge wheels 8 and the furrow opening assembly 8.
In planting units 2 such as those described herein, the weight of the elements attached to the planting unit frame 3 generally provide a first source of down pressure to the furrow opening assembly 4. As such, down pressure is necessary for the penetration of the ground surface 5 by the furrow opening assembly 4 and the proper amount of down pressure is critical to achieving optimal emergence and yields. Many times additional means of providing the furrow opening assembly 4 with down pressure are employed and typically called supplemental down pressure systems and may include pneumatic systems, spring tension systems or pressurized fluid systems. The disclosed invention is applicable to all types of planters regardless of whether the planter is outfitted with a supplemental down pressure means and if so, which type it employs. Accordingly, the scope of the present invention is not limited by the presence or absence of supplemental down pressure means on a given planting unit 2 or the type of supplemental down pressure means.
By providing the operator with a display to alert the operator to whether the furrow opening assembly 4 is penetrating the ground surface 5 to the desired depth, the depth monitoring apparatus provides an efficient means for determining if more or less down pressure is needed under a given set of planting conditions. As disclosed in the prior art, those skilled in the arts have provided adequate means for control and or adjustment of the down pressure applied. Furthermore, the display means may be incorporated with a computer programmed to compile a percentage of acres for which the furrow opening assembly 4 penetrated the ground surface 5 at the selected depth for each planting unit 2, thereby providing the operator with a data set to use when adjusting the down pressure to the optimal amount. The display means could also be integrated with existing planter monitors that display other information critical to optimal operation, such as seed delivery, seed delivery rate, acres planted, global positioning systems data and or seed population per acre.
It should be noted that the present invention is not limited to the specific embodiments pictured and described herein, but is intended to apply to all similar apparatuses for monitoring, indicating or validating depth control and or furrow penetration of a planting, seeding or drill unit during operation. Accordingly, modifications and alterations from the described embodiments will occur to those skilled in the art without departure from the spirit and scope of the present invention.

## Claims

1. A seed planting assembly comprising:
a. a laterally extending support member;
b. a planting unit including a planting frame supported by said support member, wherein said planting unit frame carries:
i. a seed trench opening assembly operable to create a seed trench in a ground surface;
ii. a seed delivery assembly for delivery of seeds into said seed trench;
iii. a seed trench closing assembly operable to close said seed trench;
iv. a depth regulating member having a vertical position relative to said seed trench opening assembly, wherein said depth regulating member responds to forces upon said planting unit to control ground surface engagement;
v. an arm assembly connecting said depth regulating member to said planting unit frame; and,
vi. a stop means mechanically engaging a portion of said arm assembly for defining a limit for vertical motion of said depth regulating member in the direction substantially opposite said ground surface;

c. a depth monitoring means for indicating whether said depth regulating member is fully engaged with said ground surface wherein said depth monitoring means indicates whether said arm assembly is engaged with said stop means.

2. The seed planting assembly as set forth in claim 1 further comprising a supplemental down pressure means supported by said support member and connected to said planting unit, wherein said supplemental down pressure means provides a variable force against said planting unit.

3. The seed planting assembly as set forth in claim 2 further comprises a means for adjusting said supplemental down pressure means so that said supplemental down pressure means acts as a variable supplemental down pressure means for controlling the down pressure to said depth regulating member.

4. The seed planting assembly as set forth in claim 3 wherein said supplemental down pressure means is pneumatically powered and actuated.

5. The seed planting assembly as set forth in claim 3 wherein said supplemental down pressure means is hydraulically driven and actuated.

6. The seed planting assembly as set forth in claim 1 said depth monitoring means is in communication with a transmission means.

7. The seed planting assembly as set forth in claim 6 wherein said transmission means is in communication with a data collection means.

8. The seed planting assembly as set forth in claim 7 wherein said data collection means is a computer.

9. The seed planting assembly as set forth in claim 8 wherein said computer has an operator interface for communication with said planting unit assembly operator.

10. The seed planting assembly as set forth in claim 9 wherein said computer is a seed planting assembly monitor.

11. The seed planting assembly as set forth in claim 1 wherein said depth monitoring means includes a comparator means for determining and comparing the relative position of said furrow forming means to the relative position of said depth regulating member to indicate seed planting assembly depth.

12. The seed planting assembly as set forth in claim 1 wherein said arm assembly is pivotably attached to said planting unit frame.

13. The seed planting assembly as set forth in claim 12 wherein said stop means is pivotably responsive to forces applied to said seed planting assembly.

14. The seed planting assembly as set forth in claim 13 wherein said depth regulating member has a first and second side, and wherein said first and second sides are independently responsive to forces.

15. The seed planting assembly as set forth in claim 1 wherein said depth monitoring means has a detection means selected from the group consisting of mechanical devices, electromechanical devices, electro-photo devices and combinations thereof.

16. An improved planter row unit comprising:
a. a frame means;
b. a furrow forming means for penetrating a ground surface and forming a furrow therein, said furrow forming means being cooperatively engaged with said frame means;
c. a depth regulation means for engaging said ground surface when said furrow forming means has penetrated said ground surface to a selected depth, said depth regulation means being cooperatively engaged with said frame means;
d. an adjustable down pressure means for controlling down pressure applied to said depth regulation means;
e. a seed delivery means cooperatively engaged with said planter frame to transport and deliver seeds to said furrow;
f. a furrow closing means for closing said furrow formed by said furrow forming means, wherein said furrow closing means is cooperatively engaged with said planter frame;
g. a stop means engaging said depth regulation means to restrict said furrow forming means from over penetrating into said ground surface; and,
h. a depth monitoring means for indicating whether said depth regulation means is engaged with said stop means.

17. The planter row unit as set forth in claim 16 wherein said adjustable down pressure means is pneumatically powered and actuated.

18. The planter row unit as set forth in claim 17 wherein said transmission means is in communication with a data collection means.

19. The planter row unit as set forth in claim 18 wherein said data collection means is a computer.

20. The planter row unit as set forth in claim 19 wherein said computer has an operator interface for communication with a planting unit assembly operator.

21. The planter row unit as set forth in claim 18 wherein said computer is integrated into a planter monitor.

22. The planter row unit as set forth in claim 16 wherein said adjustable down pressure means is hydraulically driven and actuated.

23. The planter row unit as set forth in claim 16 wherein said depth monitoring means is in communication with a transmission means.

24. The planter row unit as set forth in claim 16 wherein said depth monitoring means includes a comparator means for determining and comparing the relative position of said furrow forming means to the relative position of said gauge wheel to indicate planter row unit depth.

25. The planter row unit as set forth in claim 16 wherein said depth monitoring means is a limit switch comprising a target mounted to said depth regulating means and a switch activator mounted to said stop means, wherein said depth monitoring means is actuated by physical contact between said target and said switch activator.

26. The planter row unit as set forth in claim 25 wherein said depth regulating means is comprised of a gauge wheel and a gauge arm assembly cooperatively engaged.

27. The seed planting assembly as set forth in claim 26 wherein said arm assembly is pivotably attached to said planting unit frame.

28. The seed planting assembly as set forth in claim 27 wherein said stop means is pivotably responsive to forces applied to said planter row unit.

29. The seed planting assembly as set forth in claim 28 wherein said depth regulating means has a first and second side, and wherein said first and second sides are independently responsive to forces.

30. The planter row unit as set forth in claim 16 wherein said depth monitoring means is a limit switch comprising a target mounted to said stop means and a switch activator mounted to said depth regulating means, wherein said depth monitoring means is actuated by physical contact between said target and said switch activator.

31. The planter row unit as set forth in claim 30 wherein said depth regulating means is comprised of a gauge wheel and an arm assembly cooperatively engaged.

32. The planter row unit as set forth in claim 31 wherein said arm assembly is pivotably attached to said planting unit frame.

33. The planter row unit as set forth in claim 32 wherein said stop means is pivotably responsive to forces applied to said planter row unit.

34. The seed planting assembly as set forth in claim 33 wherein said depth regulating means has a first and second side, and wherein said first and second sides are independently responsive to forces.

35. The seed planting assembly as set forth in claim 16 wherein said depth monitoring means has an indication means selected from the group consisting of mechanical devices, electromechanical devices, electro-photo devices and combinations thereof.

36. The seed planting assembly as set forth in claim 16 wherein said depth monitoring means indicates penetration of said furrow forming means into said ground surface through indication and comparison of the selected vertical difference between said depth regulation means and said furrow forming means with the measured vertical difference between said depth regulation means and said furrow forming means.

37. An improved gauge wheel arm assembly for mounting to a planter row unit frame comprising:
a. a first end, said first end pivotably attached to a planter row unit frame;
b. a second end, said second end allowing attachment of a rotatable gauge wheel;
c. a stop means for preventing said gauge wheel arm assembly from pivoting beyond a certain predetermined point; and,
d. an indicator means, wherein said indicator means verifies engagement of said stop means and said gauge wheel arm assembly.

38. The improved gauge wheel arm assembly as set forth in claim 37 wherein said indicator means is in communication with a transmission means.

39. The improved gauge wheel arm assembly as set forth in claim 38 wherein said transmission means is in communication with a data collection means.

40. The improved gauge wheel arm assembly as set forth in claim 39 wherein said data collection means is a computer.

41. The improved gauge wheel arm assembly as set forth in claim 40 wherein said computer has an operator interface for communication with a planting unit assembly operator.

42. The improved gauge wheel arm assembly as set forth in claim 40 wherein said computer is integrated into a planter monitor.

43. The improved gauge wheel arm assembly as set forth in claim 37 wherein said indicator means is a limit switch comprising a target mounted to said indicator means and a switch activator mounted to said stop means, wherein said indicator means is actuated by physical contact between said target and said switch activator.

44. The improved gauge wheel arm assembly as set forth in claim 37 wherein said indicator means is a limit switch comprising a target mounted to said stop means and a switch activator mounted to said indicator means, wherein said indicator means is actuated by physical contact between said target and said switch activator.

45. The improved gauge wheel arm assembly as set forth in claim 37 wherein said stop means is pivotably responsive to forces applied to said planter row unit.

46. The improved gauge wheel arm assembly as set forth in claim 45 wherein said improved gauge wheel arm assembly is arranged for parallel mounting to cooperatively engage said stop means in equalizing response to forces applied to said planter row unit.

47. The improved gauge wheel arm assembly arrangement as set forth in claim 46 wherein said gauge wheel arm assemblies are independently responsive to forces applied to said planter row unit.

48. The improved gauge wheel arm assembly as set forth in claim 37 wherein said indicator means is selected from the group consisting of mechanical devices, electromechanical devices, electro-photo devices and combinations thereof.

49. An improved depth control lever comprising:
a. a first portion, said first portion adjustably attached to a planter row unit frame;
b. a second portion, said second portion functioning as a stop means when cooperatively engaged with a pivotable arm assembly to limit the vertical upward movement of said pivotable arm assembly wherein said pivotable arm assembly is cooperatively engaged with a depth regulating means; and,
e. an indicator means, wherein said indicator means verifies engagement of said second portion of said depth control lever with said pivotable arm assembly.

50. The depth control lever as set forth in claim 49 wherein said indicator means is in communication with a transmission means.

51. The depth control lever as set forth in claim 50 wherein said transmission means is in communication with a data collection means.

52. The depth control lever as set forth in claim 51 wherein said data collection means is a computer.

53. The depth control lever as set forth in claim 52 wherein said computer has an operator interface for communication with a planting unit assembly operator.

54. The depth control lever as set forth in claim 53 wherein said computer is integrated into a planter monitor.

55. The depth control lever as set forth in claim 49 wherein said indicator means is a limit switch comprising a target mounted to said indicator means and a switch activator mounted to said stop means, wherein said indicator means is actuated by physical contact between said target and said switch activator.

56. The depth control lever as set forth in claim 49 wherein said indicator means is a limit switch comprising a target mounted to said second portion and a switch activator mounted to said indicator means, wherein said indicator means is actuated by physical contact between said target and said switch activator.

57. The depth control lever as set forth in claim 49 wherein said second portion is pivotably responsive to forces applied to said planter row unit.

58. The depth control lever as set forth in claim 49 wherein said improved depth control lever is arranged for parallel mounting to cooperatively engage said second portion in equalizing response to forces applied to said planter row unit.

59. The depth control lever as set forth in claim 58 wherein said second portion is pivotably responsive to forces applied to said planter row unit.

60. The depth control lever as set forth in claim 49 wherein said indicator means is selected from the group consisting of mechanical devices, electro-mechanical devices, electro-photo devices and combinations thereof.