Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
198 words
In a screw joint tightening tool, comprising a primary motor (11) for accomplishing at high speed a low torque initial tightening of a screw joint to be tightened, a secondary motor (12) for accomplishing at low speed a high torque final tightening of the joint, and a power train (18, 19) for transferring the power of said primary motor (11) and of said secondary motor (12) to an output spindle (17) connectable to the screw joint to be tightened, the improvement wherein: said first and second motors (11,12) are arranged side-by-side, and said power train (18, 19) comprises a drive coupling and reduction gearing mechanism which includes: a main shaft (20) continuously connected to said primary motor (11), a drive sleeve (26) journalled on said main shaft (20) and being provided with an internal gear (25), a spur gear (24) on said secondary motor (12), said spur gear (24) being continuously connected to said internal gear of said drive sleeve (26) to continuously couple said drive sleeve (26) to said secondary motor (12), and a one-way free-wheeling clutch (30) interconnecting said drive sleeve (26) and said main shaft (20) during said low speed final tightening of the joint.
Claim 2
Dependent Claim
198 words
In a screw joint tightening tool, comprising a primary motor (11) for accomplishing at high speed a low torque initial tightening of a screw joint to be tightened, a secondary motor (12) for accomplishing at low speed a high torque final tightening of the joint, and a power train (18, 19) for transferring the power of said primary motor (11) and of said secondary motor (12) to an output spindle (17) connectable to the screw joint to be tightened, the improvement wherein: said first and second motors (11,12) are arranged side-by-side, and said power train (18, 19) comprises a drive coupling and reduction gearing mechanism which includes: a main shaft (20) continuously connected to said primary motor (11), a drive sleeve (26) journalled on said main shaft (20) and being provided with an internal gear (25), a spur gear (24) on said secondary motor (12), said spur gear (24) being continuously connected to said internal gear of said drive sleeve (26) to continuously couple said drive sleeve (26) to said secondary motor (12), and a one-way free-wheeling clutch (30) interconnecting said drive sleeve (26) and said main shaft (20) during said low speed final tightening of the joint.
Claim 3
Dependent Claim
38 words
Screw joint tightening tool according to claim 1, wherein said drive sleeve (26) is rotatably journalled on said main shaft (20) by two axially spaced bearings (27,28) and said one-way clutch (30) is disposed between said bearings (27,28).
Claim 4
Dependent Claim
45 words
Screw joint tightening tool according to claim 1 or 2, wherein said main shaft (20) is provided with a spur gear (22), and said primary motor is provided with a spur gear (23) for engagement with said spur gear (22) on the main shaft (20).
Claim 5
Dependent Claim
25 words
Screw joint tightening tool according to claim 1 or 2, wherein said primary and secondary motors (11, 12) are disposed in parallel with each other.
Claim 6
Dependent Claim
46 words
Screw joint tightening tool according to claim 3, wherein the reduction ratio of said spur gear (24)/internal gear (25) drive of said secondary motor (12) is 2 to 5 times the reduction ratio of said spur gear (23)/spur gear (22) drive of said primary motor (11).
Claim 7
Dependent Claim
29 words
Screw joint tightening tool according to claim 3, wherein the reduction ratio of said spur gear (24)/internal gear (25) drive of said secondary motor (12) is at least 5:1.
Claim 8
Dependent Claim
22 words
Screw joint tightening tool according to claim 5, wherein said primary and secondary motors (11,12) are disposed in parallel with each other.
Claim 9
Dependent Claim
22 words
Screw joint tightening tool according to claim 6, wherein said primary and secondary motors (11,12) are disposed in parallel with each other.