Isolator overtravel protection for walk-behind floor scraper

• US 10,329,782 B1
• Filed: 12/14/2017
• Issued: 06/25/2019
• Est. Priority Date: 12/14/2017
• Status: Active Grant

• Current Assignee: National Flooring Equipment Incorporated
• Original Assignee: National Flooring Equipment Incorporated
• Inventors: Burk, Matthew C.
• Primary Examiner(s): Kreck, Janine M
• Application Number:
  US15/842,132
• Publication Number:
  US 20190186160A1
• Time in Patent Office: 558 Days
• Field of Search: 248638, 248658, 267136, 267140, 26714013, 267141
• CPC Class Codes: B26D 1/10 in, or substantially in, a direction parallel to the cutting edge
• CPC Class Codes: B26D 3/28 Splitting layers from work; Mutually separating layers by cutting B26D3/30 takes precedence; Recovery of plastics or other constituents of waste material containing plastics B29B17/00
• CPC Class Codes: B26D 5/086 Electric, magnetic, piezoelectric, electro-magnetic means
• CPC Class Codes: E04G 23/006 Arrangements for removing of previously fixed floor coverings

Abstract

An improved walk-behind floor scraper incorporates a plurality of isolators between a main plate and cutting head to reduce vibration and a plurality of stops to prevent damage to the isolators.

Claims

1. A walk-behind floor stripping machine comprising:

(a) a main body plate;

(b) a cutting head holding a cutting blade, said cutting head adapted for oscillatory movement relative to the main body plate and affixed to the bottom surface of the main body plate via a plurality of isolators, each isolator comprising a top plate and a bottom plate held in spaced apart relation by an elastomeric member;

(c) a motor coupled to the main body plate and adapted to impart oscillatory movement of the cutting head relative to the main body plate; and

(d) a plurality of stops arranged and adapted to permit oscillatory movement of the cutting head relative to the main body plate and limit flex and shear movement of the cutting head when the cutting blade encounters an obstacle to protect the isolators from damage, each of said stops having a body portion comprising a base, a neck extending from the base, and a removable flange adapted to be attached to the end of the neck opposite the body portion, wherein the body portion is affixed to one of said main body plate and cutting head and said neck is adapted to extend through an opening in the other of said main body plate and cutting head, and wherein the base and the flange are each broader than the opening such that the base, neck and flange cooperate with surfaces surrounding the opening to permit oscillatory motion of the cutting head assembly, and limit flex and shear movement of the cutting head assembly damaging to the isolators.

2. The walk-behind floor stripping machine of claim 1 wherein each isolator further comprised a threaded opening in one of said top plate and bottom plate, said threaded opening adapted to receive the threaded shaft of a first bolt.

3. The walk-behind floor stripping machine of claim 2 wherein each isolator further comprises a second bolt having a head positioned between the top plate and the bottom plate and encapsulated by the elastomeric member, and a threaded shafted extending through the other of said top plate and bottom plate.

4. The walk-behind floor stripping machine of claim 3 wherein said second bolt is adapted to extend through an opening in the main body plate and be fitted with a nut to secure the isolator to the main body plate.

5. The walk-behind floor stripping machine of claim 4 in which the second bolt extends through an opening in the cutting head and is adapted to be fitted with a nut to secure the cutting head to the isolator.

6. The walk-behind floor stripping machine of claim 1 wherein the bottom surface of the main body plate includes a pocket adapted to receive the top of an isolator.

7. The walk-behind floor stripping machine of claim 1 wherein the top plate and a bottom plate of an isolator are made of metal.

8. The walk-behind floor stripping machine of claim 1 wherein the flange is in the form of a washer made of a hardened material.

9. The walk-behind floor stripping machine of claim 1 wherein the body portion of the stop includes opposing flattened sides.

10. The walk-behind floor stripping machine of claim 1 wherein the stop has a threaded channel.

11. The walk-behind floor stripping machine of claim 10 wherein said threaded channel is adapted to receive a pair of bolts, one of said bolts of said pair of bolts adapted to couple said stop to one of said main body plate and said cutting head and the other of said pair of bolts adapted to couple said flange to said stop.

12. A walk-behind floor stripping machine comprising:

(a) a main body plate;

(b) a cutting head holding a cutting blade, said cutting head adapted for oscillatory movement relative to the main body plate and affixed to the bottom surface of the main body plate via a plurality of isolators, each isolator comprising a top plate and a bottom plate held in spaced apart relation by an elastomeric member;

(c) a motor coupled to the main body plate and adapted to impart oscillatory movement of the cutting head relative to the main body plate; and

(d) a plurality of stops arranged and adapted to permit oscillatory movement of the cutting head relative to the main body plate and limit flex and shear movement of the cutting head when the cutting blade encounters an obstacle to protect the isolators from damage, each of said stops having a body portion affixed to the bottom surface of the main body plate, said body portion having base, and a neck extending from the base through an opening in the cutting head, each of said stops further comprising a removable flange adapted to be attached to the end of the neck opposite the body portion, wherein the body portion is affixed to said main body plate and said neck is adapted to extend through an opening in the cutting head, and wherein the base and the flange are each broader than the opening such that the base, neck and flange cooperate with surfaces of the cutting head surrounding the opening to permit oscillatory motion of the cutting head, and limit flex and shear movement of the cutting head when the cutting blade encounters an obstacle to protect the isolators from damage.