Apparatus and method for manufacturing lock washers

• US 5,755,824 A
• Filed: 10/07/1996
• Issued: 05/26/1998
• Est. Priority Date: 02/07/1995
• Status: Expired due to Fees

• Current Assignee: Saint Technologies, Inc.
• Original Assignee: Saint Switch, Inc.
• Inventors: Blair, James F. L., Blechschmidt, James L.
• Primary Examiner(s): Larson, Lowell A.
• Assistant Examiner(s): TOLAN, EDWARD THOMAS
• Application Number:
  US08/726,681
• Time in Patent Office: 596 Days
• Field of Search: 470/41, 470/42, 470/162, 470/163, 72/293, 72/295, 72/296, 72/360, 72/361, 72/420, 72/421, 72/335, 72/339, 72/461
• US Class Current: 470/42
• CPC Class Codes: F16B 33/008 Corrosion preventing means
• CPC Class Codes: F16B 39/108 with a locking washer under the nut or bolt head having at least one tongue or lug folded against the nut or bolt head, or against the object itself F16B39/103 takes precedence
• CPC Class Codes: H01R 4/64 Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail

Abstract

An assortment of lock washers is produced from a method including the steps of (a) providing a plurality of blanks formed of generally planar resilient metal, some of the blanks having a different configuration from other of the blanks, each of the blanks including a central aperture, an outer periphery, a tab, and two locating holes spaced from the central aperture and spaced from each other a selected distance and at a selected orientation relative to the tab; (b) providing a tool having two locator pins and structure for bending a tab out of the plane of a blank; (c) orientating the two locating pins with the two locating holes of a selected blank; (d) actuating the tool to bend the tab of the selected blank out of the plane of the selected blank; and (e) repeating steps (c)-(d) for each of the blanks.

Claims

1. A method for producing a lock washer, comprising the steps of:

providing a generally planar blank formed of resilient metal, said blank including an outer periphery, a central aperture, and a standard feature including a tab and two locating holes, said locating holes spaced from the central aperture, said locating holes spaced a selected distance from each other and in a selected orientation relative to the tab, said blank further including a second occurrence of the standard feature including a second tab and third and fourth locating holes, said third and fourth locating holes spaced from said central aperture, said third and fourth locating holes spaced the selected distance from each other and at the selected orientation relative to said second tab;

orienting a forming tool with respect to said locating holes, said forming tool having means for bending a tab out of the plane of the blank;

bending said tab out of the plane of the blank using said forming tool;

orienting said forming tool with respect to said third and fourth locating holes; and

bending said second tab out of the plane of the blank using said forming tool.

2. The method of claim 1, wherein said central aperture is generally circular around a center, and said locating holes are substantially equally spaced from said center and located between the outer periphery and the central aperture.

3. A method for producing a lock washer, comprising the steps of:

forming a generally planar blank of resilient metal with a central aperture and an outer periphery;

forming two tool locating holes in said blank, said holes spaced from said central aperture, said holes spaced a selected distance from each other;

forming a first cut in said blank, said cut defining a first tab at a selected orientation relative to said two locating holes;

forming a third tool locating hole in said blank, said third hole spaced from said central aperture, said third hole being spaced said selected distance from one of said two locating holes;

forming a second cut in said blank, said cut defining a second tab at said selected orientation relative to said one hole and said third hole;

orienting a forming tool with respect to said locating holes, said forming tool having means for bending a tab out of the plane of the blank;

bending said first tab out of the plane of the blank using said forming tool;

orienting said forming tool with respect to the third hole and said another locating hole; and

bending the second tab out of the plane of the blank using said forming tool.

4. The method of claim 3, wherein:

said central aperture is generally circular around a center;

said locating holes are substantially equally spaced from said center and are located between said outer periphery and said central aperture; and

said cutting step forms a substantially L-shaped cut in said blank.

5. The method of claim 3, wherein said forming tool includes means for cutting said blank to form said cuts defining said tabs, and said step of forming a first cut in said blank is performed using said forming tool after said step of orienting a forming tool with respect to said two locating holes and substantially simultaneously with said step of bending said first tab.

6. The method of claim 3, wherein said steps of forming a blank, forming two locating holes, forming a first cut, forming a third locating hole, and forming a second cut are performed using a photoetching process to form said blank, said locating holes, and said cuts.

7. The method of claim 3, wherein said all of said steps are performed repeatedly to produce a plurality of lock washers.

8. A method for producing a lock washer, comprising the steps of:

(a) forming a generally planar blank of resilient metal with an outer periphery and a central aperture;

(b) forming first, second, third and fourth locating holes in said blank, said locating holes spaced from said central aperture, said first and second holes being spaced a selected distance from each other, said third and forth holes spaced the selected distance from each other;

(c) forming a first cut in said blank, said first cut defining a first tab in said blank at a selected orientation relative to said first and second locating holes;

(d) forming a second cut in said blank, said second cut defining a second tab in said blank at said selected orientation relative to said third and fourth locating holes;

(e) orienting a forming tool with respect to said first and second locating holes, said forming tool having means for bending a tab out of the plane of the blank;

(f) bending said first tab out of the plane of the blank using said forming tool;

(g) orienting said forming tool with respect to said third and fourth locating holes; and

(h) bending said second tab out of the plane of the blank using said forming tool.

9. The method of claim 8, wherein:

said central aperture is generally circular around a center;

said locating holes are substantially equally spaced from said center and located between said central aperture and said outer periphery; and

said cutting steps form substantially L-shaped cuts in said blank.

10. The method of claim 8, wherein:

said forming tool includes means for forming a cut to define a tab;

step (c) is accomplished substantially simultaneously with step (f) after step (e) using said forming tool; and

step (d) is accomplished substantially simultaneously with step (h) after step (g) using said forming tool.

11. The method of claim 10, wherein said forming tool is a die assembly which both cuts said blank and bends the tab formed by said cut.

12. The method of claim 8, wherein a plurality of blanks of different configurations are provided, and steps (b) through (h) are practiced on each of said blanks.

13. The method of claim 8, wherein:

said first tab is located between said first and second holes; and

said second tab is located between said third and forth holes.

14. The method of claim 8, wherein said first and second tabs are bent out of the plane of the blank in opposite directions.

15. A method for producing an assortment of lock washers, comprising the steps of:

(a) providing a plurality of blanks formed of generally planar resilient metal, some of said blanks having a different configuration from other of said blanks, each of said blanks including a central aperture, an outer periphery, a tab, and two locating holes spaced from said central aperture and spaced from each other a selected distance and at a selected orientation relative to said tab;

(b) providing a tool having two locator pins and means for bending a tab out of the plane of a blank;

(c) orienting said two locator pins with respect to said two locating holes of a selected blank;

(d) actuating the tool to bend the tab of the selected blank out of the plane of the selected blank; and

(e) repeating steps (c) through (d) for each of said blanks.

16. The method of claim 15, wherein for each of said blanks said central aperture is generally circular around a center and said locating holes are substantially equally spaced from said center and located between said central aperture and said periphery.

17. A method for producing a lock washer, comprising the steps of:

providing a generally planar blank formed of resilient metal, said blank including a central aperture and a first tab;

providing a generally planar template adapted to receive said blank, said template including a first pair of locating holes, said locating holes spaced a first selected distance from each other;

providing means for orienting said blank with respect to said template, said orienting means including at least one lug on one of said blank and said template and at least one lug-receiving aperture on the other of said blank and said template;

orienting a forming tool with respect to said first pair of locating holes in said template, said tool having means for bending a tab out of the plane of a blank;

orienting said blank with respect to said template with said at least one lug received in said at least one lug-receiving aperture whereby said first tab is at a first selected orientation relative to said first pair of locating holes; and

bending said first tab out of the plane of said blank using said forming tool.

18. The method of claim 17 further comprising the steps of:

providing said blank with a second tab; and

providing said template with a second pair of locating holes, said locating holes of said second pair spaced a second selected distance from each other;

orienting said forming tool with respect to said second pair of locating holes in said template;

orienting said blank with respect to said template with said at least one lug received in said at least one lug-receiving aperture whereby said second tab is at a second selected orientation relative to said second pair of locating holes; and

bending said second tab out of the plane of said blank using said forming tool.

19. The method of claim 18 wherein said first and said second selected distances are equal and said first and second selected orientations are the same.

20. The method of claim 18 wherein said first and said second selected distances are not equal.

21. The method of claim 18 wherein said step of orienting said blank with respect to said template is performed prior to said step of orienting a forming tool with respect to said first pair of locating holes in said template.