Internal combustion engine distributor-breaker unit holding and adjustment arrangement

Claim 2

Internal combustion engine distributor holding and adjusting arrangement, to secure a distributor (10) in adjusted position on the motor block (20) of the engine, having a housing (11), a shaft (12) for insertion in the motor block (20) of the engine, means (21, 23) secured to the motor block (20) and engaging the distributor (10) to clamp the distributor to the motor block (20) including a releasable bolt (26) to tighten the distributor into frictional engagement with the block; and a unitary boss concentric with said shaft (12) and formed with essentially parallel engagement surfaces to permit engagement therewith by a wrench located below the bottom of the housing (11) of the distributor and forming a thickened portion of said shaft (12), the engagement surfaces tapering slightly in the direction of the bottom of the housing (11) so that, upon application of rotary force to said engagement surfaces, a lifting force component will result to permit slight relative rotary movement between the shaft, and hence the distributor, and the motor block after said clamping means have clamped the distributor against the motor block to permit fine adjustment of ignition timing of the engine.

Claim 3

Arrangement according to claim 1, wherein the angle of taper of the engagement surfaces (13) is in the order of 2°- 5°.

Claim 4

Arrangement according to claim 1 wherein the means (21, 23) secured to the motor block and engaging the distributor comprise a fork-shaped claw (23) with an opening between the fork ends (29) engaging around the shaft (12) of the distributor; and a flange (21) secured to the housing and having a surface seating against a matching surface on the engine block, the claw engaging around the shaft and over the flange.

Claim 5

Arrangement according to claim 1, further comprising a bead or flange (14) formed on said boss and beneath said engagement surfaces, spaced from the bottom of the housing (11), the bead or flange forming a terminating surface of said boss with respect to the shaft (12).

Claim 6

Arrangement according to claim 1, wherein said engagement surfaces (13) formed on the boss are hexagonally arranged with respect to each other.

Claim 7

Internal combustion engine distributor holding and adjusting arrangement, to secure a distributor (10) in adjusted position on the motor block (20) of the engine, having a housing (11), a shaft (12) for insertion in the motor block (20) of the engine, a fork-shaped claw (23, 43) with an opening between the fork ends (29) engaging around the shaft (12) of the distributor, the claw being secured to the motor block (20) and engaging the distributor (10) to clamp the distributor to the motor block (20) including a releasable bolt (26) to tighten the distributor into frictional engagement with the block; and adjustment means (13, 35, 36, 47) acting on the shaft (12) of the distributor and permitting slight relative rotary movement between the shaft, and hence the distributor, and the motor block after said clamping means have clamped the distributor against the motor block to permit fine adjustment of ignition timing of the engine, said adjustment means comprising a pair of screws (31, 31'), a pair of threaded means (30, 42) on the claw located, respectively, symmetrically with respect to the plane of rotation of the distributor shaft and the plane of symmetry of the end portions (29), the screws (31) being located in said end portions and engaging the distributor eccentrically with respect to the center of the shaft and symmetrically with respect to each side of said plane of symmetry to rotatably adjust the distributor upon rotation of one of the screws in the thread means, and to lock the distributor in adjusted position upon engagement of the other of said screws with the distributor.

Claim 8

Internal combustion engine distributor holding and adjusting arrangement, to secure a distributor (10) in adjusted position on the motor block (20) of the engine, having a housing (11), a shaft (12) for insertion in the motor block (20) of the engine, a fork-shaped claw (23, 43) with an opening between the fork ends (29) engaging around the shaft (12) of the distributor, the claw being secured to the motor block (20) and engaging the distributor (10) to clamp the distributor to the motor block (20) including a releasable bolt (26) to tighten the distributor into frictional engagement with the block; and adjustment means (13, 35, 36, 47) acting on the shaft (12) of the distributor and permitting slight relative rotary movement between the shaft, and hence the distributor, and the motor block after said clamping means have clamped the distributor against the motor block to permit fine adjustment of ignition timing of the engine, said adjustment means comprising a pair of screws (31, 31'), a pair of threaded means (30, 42) on the claw located, respectively, symmetrically with respect to the plane of rotation of the distributor shaft and the plane of symmetry of the end portions (29), the screws (31) being located in said end portions and engaging the distributor eccentrically with respect to the center of the shaft and symmetrically with respect to each side of said plane of symmetry to rotatably adjust the distributor upon rotation of one of the screws in the thread means, and to lock the distributor in adjusted position upon engagement of the other of said screws with the distributor.

Claim 9

Arrangement according to claim 6 wherein the means (21, 23) secured to the motor block and engaging the distributor comprise a fork-shaped claw (23) with an opening between the fork ends (29) engaging around the shaft (12) of the distributor; and a flange (21) secured to the housing and having a surface seating against a matching surface on the engine block, the claw engaging around the shaft and over the flange.

Claim 10

Arrangement according to claim 6, wherein (FIGS. 4 and 5) the claw is generally L-shaped and has an abutment portion (40) engaging the motor block (20) of the engine and a plate portion (45) formed with said fork ends, the screws (31') passing through the abutment portion of the claw symmetrically with respect to said plane of symmetry; and engagement surfaces (47) located eccentrically with respect to the axis of rotation of the distributor and located in alignment with said screw (31').

Claim 11

Arrangement according to claim 6, wherein (FIGS. 2 and 3) the fork-shaped end portions (29) of the claw (23) are formed with facing, aligned, tapped bores (30), the bolts (12) being threaded into said bores; and an adjustment block (32) is located between said bolts and held thereby, the adjustment block (32) being formed with means (35) eccentrically engaging a portion (21) of the housing.

Claim 12

Arrangement according to claim 6, wherein the housing is formed with a flange (21) having a surface seating against a matching surface on the engine block, the claw engaging around the shaft and over the flange; said flange being formed with an eccentric opening (26) and the adjustment block (32) being formed with a pin (35) engaging the eccentric opening, the adjustment block being additionally formed with aligned blind bores (33) located to receive the screws (31).