Shield for grass trimmer

• US 4,200,978 A
• Filed: 12/06/1978
• Issued: 05/06/1980
• Est. Priority Date: 12/06/1978
• Status: Expired due to Term

• Current Assignee: Benchmark Tool Company
• Original Assignee: Mcgraw-Edison Company (Eaton Corporation PLC.)
• Inventors: Bartlett, Robert L., Irelan, Edward A., Walch, John W.
• Primary Examiner(s): Peters, Jimmy C.
• Application Number:
  US05/966,879
• Time in Patent Office: 517 Days
• Field of Search: 56/12.7, 56/295, 30/276, 30/347
• US Class Current: 30/276
• CPC Class Codes: A01D 34/416 Flexible line cutters

Abstract

A grass trimmer includes a housing having a lower base wall from which extends a hub member of a predetermined height coupled to a motor encased in the housing, which motor drives the hub member rotatably. A cutting line element is attached to the hub member. A rim extends outwardly from the housing about the perimeter of the base wall. A first rim portion is of a height greater than the hub member and includes first and second spaced mounting ears extending therefrom toward the hub member. A protective shield designed for mounting on the housing in spaced relation from the base wall, is planar and of a similar shape to the base wall. The shield includes first and second tab and shoulder assemblies located for cooperation with the ears on the rim portion of the housing. Joining the last mentioned assemblies and respective ears attaches the shield to the trimmer housing. A resilient locking lever arm provided on the shield cooperates with a locking rib formed on the rim portion of the housing upon engagement of the tab and shoulder assemblies and mounting ears to removably lock the shield to the housing. The shield prevents the hub member from being driven into the grass during operation of the trimmer, thereby preventing damage to the motor driving the hub member.

An aperture in the protective shield permits easy attachment of cutting line elements to the hub member without removing the shield.

Claims

1. A grass trimmer comprising in combination, a housing having a base wall, motor means mounted in said housing, a hub member of a predetermined height extending from the base wall of said housing, a cutting element attached to said hub member and extending radially outwardly therefrom, said hub member being coupled to said motor means and driven rotatably thereby, said housing including a rim extending outwardly from and about the perimeter of said base wall, the height of a first rim portion being greater than the height of said hub member first mounting means provided on said first rim portion and shield means removably mountable on said trimmer housing, said shield means comprising a substantially planar member having a shape similar to that of said base wall and including second mounting means cooperating with said first mounting means and engageable therewith for attachment of said shield to said first rim portion in spaced relation with respect to said base wall with said hub member being interposed between said shield and said base wall, and locking means for removably securing said shield onto said first rim portion, said locking means including a resilient locking lever joined to said shield member, said locking lever defining a notch therein and locking rib means provided on said first rim portion, said locking rib means engaging said locking lever upon engagement of said first and second mounting means, whereby said rib means is received in said notch with a snap action for removably securing said shield member on said trimmer housing.

2. A grass trimmer as claimed in claim 1 wherein the height of a second portion of said rim is less than that of said hub member and wherein said cutting element extends outwardly between said second rim portion and shield for cutting vegetation.

3. A grass trimmer as claimed in claim 1 wherein said first mounting means includes first and second spaced ears, each extending from said first rim portion inwardly therefrom towards said hub member and wherein said second mounting means includes first and second assemblies, each having a pair of spaced tabs extending from said shield substantially along the plane thereof and a shoulder provided between said tabs, but offset from the plane of said tabs, said first and second assemblies cooperating with said first and second ears, respectively, whereby said ears are received between said tabs and engage said shoulder thereby to attach said shield to said trimmer housing.

4. A grass trimmer as claimed in claim 3 wherein said tabs of said first and second mounting means are received on the edge of said first rim portion with said mounting ear extending therebetween, substantially in the plane of said tabs, said shoulder being positioned between said tabs, but offset with respect thereto, in engagement with said mounting ear.

5. A grass trimmer as claimed in claim 1 wherein said locking lever arm includes a free end portion defining said notch therein and wherein said locking rib includes an inclined wall and edge means, said end portion of said locking lever arm being engageable with said inclined wall upon engagement of said first and second mounting means so that said end portion is slidable along said inclined wall to urge said lever arm in a first direction until said notch is aligned with said edge means, whereafter said arm is moved rapidly in the opposite direction to receive said edge means in said notch, thereby securing said shield on said housing.

6. A grass trimmer as claimed in claims 3 and 5 wherein said trimmer housing and shield are of a molded plastic construction and wherein said first and second spaced mounting ears and locking rib are formed integrally with said trimmer housing and wherein said tab and shoulder assemblies and locking lever arm are formed integrally with said shield.

7. A shield for a grass trimmer including a housing having a base wall, a motor mounted in said housing, a hub member of a predetermined height extending from the base wall of said housing, a cutting line element attached to said hub member and extending outwardly therefrom, said hub member being coupled to said motor and driven rotatably thereby, said housing including a rim extending about the perimeter of said base wall, the height of at least a portion of said rim being greater than said hub member and first mounting means and a locking rib mounted on said rim portion, said shield comprising a generally planar member having a shape similar to that of said base wall of said trimmer housing, said member including second mounting means for engagement with said first mounting means on said trimmer housing for attaching said shield to said trimmer housing in spaced relation from said base wall with said hub member interposed therebetween and a resilient locking lever including means for lockingly engaging said locking rib on said trimmer housing upon engagement of said first and second mounting means for removably securing said shield on said trimmer housing.

8. A shield as claimed in claim 7 wherein said second mounting means includes a tab and shoulder assembly including a pair of spaced tabs and a shoulder portion interposed therebetween, offset from said tabs, said first mounting means being received between said tabs in engagement with said shoulder for attaching said shield on said housing and wherein said locking lever defines a notch therein for receipt of said locking rib with a snap action upon engagement of said tab and shoulder assembly and said first mounting means.

9. A shield as claimed in claim 8 wherein said planar member defines an aperture therein through which said hub member is accessible or exchanging cutting line elements, with said shield remaining in place on said trimmer housing.

10. A shield as claimed in claim 8 wherein said planar shield member is separated from said rim portion along a first edge of said member and wherein said locking lever extends between said first edge of said member and said rim portion in the space defined therebetween and is accessible for manual disengagement of said locking lever and said locking rib, thereby to remove said member from said housing.