Impact scraping tool for scraping material from surfaces

• US 5,010,647 A
• Filed: 07/25/1989
• Issued: 04/30/1991
• Est. Priority Date: 07/25/1989
• Status: Expired due to Term

• Current Assignee: Thomas C. Gray
• Original Assignee: Thomas C. Gray
• Inventors: Gray, Thomas C.
• Primary Examiner(s): Bell, Paul A.
• Assistant Examiner(s): Fridie, Jr., Willmon
• Application Number:
  US07/385,284
• Time in Patent Office: 644 Days
• Field of Search: 173/90, 173/128, 15/236.01, 30/169, 30/172
• US Class Current: 30/169
• CPC Class Codes: B44D 3/164 comprising blades

Abstract

An improved impact scraping tool for scraping material from surfaces is set forth having a ramming member for transmitting externally applied thrust forces to a thrust member which is slidably mounted to the ramming member for relative motion therewith. The ramming member has a discontinuity in cross-section which when engaged by the thrust member stops the relative motion between the members and results in a transfer of the momentum of the ramming member to the thrust member. A blade support plate having lateral grooves in its upper and under surfaces is carried by the thrust member and clamped to a pair of T-shaped claims which have laterally extending shoulders for engagement into the grooves. Material scraped from surfaces is precluded from wedging between the clamps and the blade support plate which prolongs the life of the scraping tool.

Claims

1. An improved impact scraping tool for scraping material from surfaces, comprising:

(a) A ramming member having a longitudinal axis for transmitting thrust faces externally applied to said ramming member to said surface;

(b) A thrust member telescopically mounted to said ramming member to permit slidable axial movement relative thereto;

(c) Barrier means carried by said ramming member for barring further axial movement of said ramming member relative to said thrust member such that the momentum of said ramming member is transferred to said thrust member upon said thrust member engaging said barrier means;

(d) a blade support plate carried by said thrust member having a laterally extending groove in its upper and under surfaces;

(e) A pair of clamp members having a laterally extending shoulder adapted for insertion into said lateral grooves where said clamp members are mounted to said thrust member; and

(f) A cutting blade removably mounted to said blade support plate such that upon application of an external thrust force to said ramming member said thrust member will engage said barrier means where upon the momentum of said ramming member is transferred to said thrust member thereby permitting said cutting blade to impact against said material surface.

2. The improved impact scraping tool recited in claim 1 further comprising a spacer plate positioned intermediate said clamp members and bearing in part against said blade support plate.

3. The improved impact scraping tool recited in claim 2 where said blade support plate has a recess region contiguous with said spacer plate.

4. The improved impact scraping tool recited in claim 3 wherein said barrier means comprises a discontinuity in cross-section of said ramming member.

5. An improved impact tool for scraping material from surfaces of the type having a cutting blade, a ramming member having a longitudinal axis for transmitting thrust forces externally applied to said ramming member, a thrust member telescopically mounted to said ramming member for slidable relative axial movement therewith, barrier means responsive to relative axial movement between said ramming member and said thrust member for stopping said relative axial movement, wherein the improvement comprises:

(a) A blade support plate carried by said thrust member having a laterally extending groove contained in its upper and under surfaces; and

(b) A pair of clamp members oppositely mounted to said thrust member and having a laterally extending shoulder adapted for insertion into said lateral grooves where said clamp members are mounted to said thrust member such that material scraped from said surfaces is precluded from build-up between said clamp members and said blade support plate.

6. The improved impact scraping tool recited in claim 5 further comprising a spacer plate positioned intermediate said clamp members and bearing in part against said blade support plate.

7. The improved impact scraping tool recited in claim 6 where said blade support plate has a recess region contiguous with said spacer plate.

8. The improved impact scraping tool recited in claim 7 where said barrier means comprises a discontinuity in cross-section of said ramming member.