Extendable drag plow

• US 5,392,538 A
• Filed: 06/02/1993
• Issued: 02/28/1995
• Est. Priority Date: 06/02/1993
• Status: Expired due to Term

• Current Assignee: Extenda Plow, LLC
• Original Assignee: Gerald J. Geerligs, Rick A. Geerligs
• Inventors: Geerligs, Rick A., Geerligs, Gerald J.
• Primary Examiner(s): Taylor, Dennis L.
• Assistant Examiner(s): BATSON, VICTOR D
• Application Number:
  US08/070,266
• Time in Patent Office: 636 Days
• Field of Search: 37/266, 37/331, 37/407, 37/416, 37/236, 172/791, 172/793, 172/795, 172/797, 172/815, 172/827, 172/667, 172/684.5, 172/741, 172/701.1, 414/724, 414/912, 414/703
• US Class Current: 37/268
• CPC Class Codes: E01H 5/061 by scraper blades
• CPC Class Codes: E01H 5/065 characterised by the form of the snow-plough blade, e.g. flexible, or by snow-plough blade accessories E01H5/061, E01H5/063 take precedence
• CPC Class Codes: E01H 5/068 by backblades scraper blades mounted on the rear of a tractor E02F3/7622

Abstract

The extendable drag plow provided by this invention has a laterally-fixed center section, and moveable outer sections positioned by a controllable actuator system. The moveable plow sections are equipped with followers engaging oppositely-extending pairs of guideways in the central plow section, with the actuators positioned between these pairs. A lifting actuator extends between pivotal connections to a bracket mounted on the vehicle and a terminal fixed with respect to the central plow section. Drag arms are also pivotally connected to a bracket mounted on the vehicle and are secured at their opposite end to the central plow section. A diagonal brace extending between the top portion of the central plow section and the drag arm is also used as a terminal for the actuator.

Claims

1. An extendable drag plow, comprising:

a central plow section having vertically spaced horizontal guideways;

at least one laterally moveable plow section having members engaging said guideways for movement of said moveable plow section from a retracted central position overlapping said central plow section to a laterally extended position;

shifting actuator means adapted to induce said movement;

bracket means adapted for mounting on a vehicle;

laterally-spaced drag arm means pivotally connected to said bracket means;

a laterally-extending beam interconnecting said drag arm means;

diagonal brace means connecting the upper extremity of said central plow section to an intermediate point on said beam; and

lifting actuator means pivotally connected to said bracket means and to said diagonal brace means.

2. A plow as defined in claim 1, wherein said plow sections have opposite bends on horizontal axes, respectively, and said drag arm is connected to said central plow section at said bend thereon.

3. A plow as defined in claim 2, wherein said guideways are disposed above and below said bend.

4. An extendable drag plow including a central plow section having vertically spaced horizontal guideways, opposite laterally moveable plow sections having follower members engaging said guideways for movement of said moveable plow sections from a retracted central position overlapping said central plow section to a laterally extended position, shifting actuator means adapted to induce said movement, bracket means adapted for mounting on a vehicle, and drag arm means connected to said central plow section, wherein the improvement comprises:

an arrangement of said guideways and follower members including adjacent pairs of oppositely extending guideways, each of said moveable plow sections having follower means engaging one guideway of each of said pairs, said actuator means being disposed between said pairs.