Hand circular saw with swinging protective hood and miter angle adjusting device

• US 5,517,763 A
• Filed: 01/20/1995
• Issued: 05/21/1996
• Est. Priority Date: 02/02/1994
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schilling, Rainer, Matzo, David
• Primary Examiner(s): Watts, Douglas D.
• Application Number:
  US08/376,102
• Time in Patent Office: 487 Days
• Field of Search: 30/371, 30/375, 30/376, 30/377, 30/390, 30/391
• US Class Current: 30/376
• CPC Class Codes: B27B 9/02 Arrangements for adjusting the cutting depth or the amount of tilting

Abstract

A hand circular saw has a saw blade rotatable about a saw shaft axis, a housing which receives the saw shaft axis, a base plate which supports the housing and is movable with the latter, the housing being turnable relative to the base plate about two axes extending perpendicular to one another independently from one another and arrestable, the axis including a first axis which extends parallel to the saw shaft axis and operates for adjusting a cutting depth, and a second axis which extends both parallel to the base plate and to the saw blade and is used for adjustment of a miter angle, a coulisse having a circular arc-shaped guiding track and a coulisse block which determine a position of the second axis. The coulisse has a coulisse part which is fixedly connected with the base plate and has an upwardly curved ring portion which is also arranged on the base plate. The ring portion has a convex side which has the guiding track extending upwardly and has a center of curvature coinciding with the second axis used for adjustment of the miter angle.

Claims

1. A hand circular saw, comprising a saw blade rotatable about a saw shaft axis;

a housing which receives said saw shaft axis;

a base plate which supports said housing and is movable with the latter, said housing being turnable relative to said base plate about two axes extending perpendicular to one another independently from one another and arrestable, said axis including a first axis which extends parallel to said saw shaft axis and operates for adjusting a cutting depth, and a second axis which extends both parallel to said base plate and to said saw blade and is used for adjustment of a miter angle;

a coulisse determining a position of said second axis and having a circular arc-shaped guiding track and a coulisse block, said coulisse having a coulisse part which is fixedly connected with said base plate and has an upwardly curved ring portion which is also arranged on said base plate, said ring portion having a convex side which has said guiding track and has a center of curvature coinciding with said second axis used for adjustment of the miter angle.

2. A hand circular saw as defined in claim 1;

and further comprising a cutting depth guiding bracket provided for adjusting the cutting depth.

3. A hand circular saw as defined in claim 1, wherein said track is formed by a strip-shaped web which is freely punched and pressed from said base plate and is of one piece with said base plate.

4. A hand circular saw as defined in claim 2, wherein a first one of said coulisse blocks carries said cutting depth guiding bracket and a second one of said coulisse blocks forms said first axis and is similar to said first coulisse block.

5. A hand circular saw as defined in claim 4, wherein said second coulisse block is formed as a hinge.

6. A hand circular saw as defined in claim 1, wherein said coulisse block has a width which is at least equal to a width of said guiding track.

7. A hand circular saw as defined in claim 1;

and further comprising a body which is formed as a scale carrier and located under said coulisse part so as to extend laterally beyond said coulisse part between said coulisse part and said base plate non-releasably from said base plate, said body having a region extending outwardly beyond said base plate and supporting a scale.

8. A hand circular saw as defined in claim 7, wherein said body has the shape of a portion of a cylinder.

9. A hand circular saw as defined in claim 7, wherein said body has the shape of a portion of a ring.

10. A hand circular saw as defined in claim 7, wherein said coulisse block is formed as a ring portion composed of a sheet metal and provided laterally with a projection, said projection being formed as a pointer relative to said scale carrier.

11. A hand circular saw as defined in claim 7, wherein said coulisse block is formed as a ring portion composed of a sheet metal and provided laterally with a projection, said projection being formed as a pointer relative to said scale.

12. A hand circular saw as defined in claim 1;

and further comprising arresting means for fixing said coulisse block relative to said base plate, said arresting means including a threaded bolt extending through said coulisse part slot in said coulisse block, said slot having slot ends so that said threaded bolt determines in cooperation with said slot ends a path of said coulisse block and therefore an adjustable region of the miter angle.

13. A hand circular saw as defined in claim 1;

and further comprising a clamping ring portion which engages said coulisse block and together with said guiding track forms an adjustable guiding slot for guiding and arresting said coulisse block with an adjustable friction.

14. A hand circular saw as defined in claim 13;

and further comprising means for adjusting a width of said guiding gap and including a threaded bolt and a nut releasably by a clamping lever.

15. A hand circular saw as defined in claim 14, wherein said means for adjusting a width of said guiding gap maintains an unchangeable position in all miter angle positions.