Apparatus for actuating the operation of a snowplow

• US 4,237,629 A
• Filed: 08/04/1978
• Issued: 12/09/1980
• Est. Priority Date: 08/12/1977
• Status: Expired due to Term

• Current Assignee: Ing. Alfred Schmidt GmbH
• Original Assignee: Ing. Alfred Schmidt GmbH
• Inventors: Schmidt, Alfred
• Primary Examiner(s): Eickholt, E. H.
• Application Number:
  US05/930,932
• Time in Patent Office: 858 Days
• Field of Search: 37/41, 37/42 R, 37/42 VL, 37/50, 200/4, 200/6 A, 200/16 C, 200/61.86
• US Class Current: 37/234
• CPC Class Codes: E01H 5/066 Snow-plough blade accessories, e.g. deflector plates, skid shoes
• CPC Class Codes: E02F 9/2004 Control mechanisms, e.g. control levers control levers per se G05G
• CPC Class Codes: G05G 2009/04707 with ball joint
• CPC Class Codes: G05G 2009/04744 Switches
• CPC Class Codes: G05G 2009/04774 with additional switches or sensors on the handle
• CPC Class Codes: G05G 9/047 the controlling member being movable by hand about orthogonal axes, e.g. joysticks for switches H01H25/04

Abstract

A snow plow having a blade movable by a plurality of drive devices actuated by switch members is controllable by a stick shift having a hand grip at one end and contacts at the other end for engagement with the switch members. The stick shift is pivotal from a neutral position in a selected one of a plurality of paths into engagement with the switch members, and includes in combination with its hand grip two additional switches for controlling at least one additional operation of said blade independently of the position of the stick shift.

Claims

1. Apparatus for controlling the operation of a snow plow having a blade movable by drive means actuated by switch members, comprising a stick shift having a hand grip at one end and means at the other end for engagement with said switch members, said stick shift being pivotal from a neutral position in a selected one of a plurality of paths into engagement with the switch members, said switch members being connected to said drive means for respectively "raising", "lowering", "adjusting to the right", and "adjusting to the left" said blade and including two additional switch means in combination with said hand grip for controlling at least one additional operation for "plowing under dead weight" and "unlock in adjusting direction" of said blade independently of the position of the stick shift.

2. The apparatus for controlling the operation of a snow plow according to claim 1, wherein said switch members have normally open contacts and remain connected so long as said stick shift is in engagement therewith.

3. The apparatus for controlling the operation of a snow plow according to claim 2, including spring means for normally biasing said stick shift in neutral position and causing automatic return to said neutral position on release of said stick shift.

4. The apparatus according to claim 1, wherein said hand grip switch means is a push button mounted on said hand grip.

5. The apparatus according to claim 4, wherein the push button is a thumb knob mounted on the top end of the hand grip, for thumb operation.

6. The apparatus according to claim 4, wherein the push button has a normally open contact and remains connected as long as the actuating force acts thereon.

7. The apparatus according to claim 6, including spring means for normally biasing in open position said push button and causing automatic return to open contact position on release of said push button.

8. The apparatus according to claim 1 or 4, wherein said hand grip is displaceable axially along said stick shift and said hand grip switch means includes cooperable contacts actuatable by displacement of the hand grip.

9. The apparatus according to claim 8, wherein said hand grip is movable between a first position in which said contacts are disengaged and a second position wherein said contacts are engaged.

10. The apparatus according to claim 9, including spring means for normally biasing said hand grip in said first position and for automatically returning said hand grip to said first position on release thereof.

11. The apparatus according to claim 1, including means for effecting the operation of "adjust" (AR, AL) simultaneously with the operation "plow" (P).

12. The apparatus according to claim 1, including means for automatically annulling the operation "plow" (P) upon actuation of the operations "raise" (R) or "lower" (L).

13. The apparatus according to claim 1, including means for controlling the operation of "unlock in adjust direction" (U) simultaneously with the operations "raise" (R) and "lower" (L).