US3874125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible pad sander
Assignee: Robert Bosch GmbH
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Filing: 1974-03-27
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Granted: 1975-04-01
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Expires: 1994-03-27
Abstract
Abstract A sander wherein an electric motor can rotate a shaft in two directions and the shaft carries an eccentric which orbits the pad while the shaft rotates in one direction and reciprocates the pad while the shaft rotates in the opposite direction. Two counterweights rotate about the shaft in the same direction while the pad orbits, and in opposite directions while the pad reciprocates. A change in the direction of rotary movement of the shaft automatically entails a conversion of orbital movement of the pad into reciprocatory movement, or vice versa.
Inventors
- 👤 Reinhold Stroezel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:58
CPC Classifications
B; B24; B24B; B24B23/00; B24B23/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
111 words
In a pad sander, a combination comprising a housing; a pad movably coupled to said housing; drive means including a prime mover, an eccentric receiving motion from said prime mover and arranged to move said pad with respect to said housing, and control means operable to respectively convert the movement of said eccentric into orbital or reciprocatory movements of said pad; a pair of counterweights rotatable about a common axis to compensate for the imbalance of said pad while the pad performs said movements; and means for respectively rotating said counterweights in the same direction and in opposite directions when said pad respectively orbits and reciprocates with respect to said housing.
Claim 2
Dependent Claim
111 words
In a pad sander, a combination comprising a housing; a pad movably coupled to said housing; drive means including a prime mover, an eccentric receiving motion from said prime mover and arranged to move said pad with respect to said housing, and control means operable to respectively convert the movement of said eccentric into orbital or reciprocatory movements of said pad; a pair of counterweights rotatable about a common axis to compensate for the imbalance of said pad while the pad performs said movements; and means for respectively rotating said counterweights in the same direction and in opposite directions when said pad respectively orbits and reciprocates with respect to said housing.
Claim 3
Dependent Claim
17 words
A combination as defined in claim 1, further comprising mechanical selector means for operating said control means.
Claim 4
Dependent Claim
55 words
A combination as defined in claim 1, wherein said prime mover comprises a rotory output member and further comprising a shaft rotatable in said housing about said common axis, said counterweights being mounted on said shaft and said drive means further comprising gears for rotating said shaft in response to rotation of said output member.
Claim 5
Dependent Claim
25 words
A combination as defined in claim 3, further comprising a carrier for one of said counterweights, one of said gears being rigid with said carrier.
Claim 6
Dependent Claim
22 words
A combination as defined in claim 3, further comprising means for transmitting torque from said shaft directly to one of said counterweights.
Claim 7
Dependent Claim
123 words
A combination as defined in claim 3, wherein said output member is parallel with said shaft and further comprising a carrier rigid with one of said counterweights and mounted on said shaft, said drive means further comprising an intermediate shaft and said gears including first and second gears rigid with said output member, a third gear mounted on said intermediate shaft and meshing with said first gear, a fourth gear rigid with said carrier and meshing with said second gear, and a fifth gear mounted on said first mentioned shaft and meshing with said third gear, said drive means further comprising coupling means operable to transmit torque or to interrupt the transmission of torque from said fifth gear to said first mentioned shaft.
Claim 8
Dependent Claim
26 words
A combination as defined in claim 6, wherein one of said first and second gears is larger than the other of said first and second gears.
Claim 9
Dependent Claim
17 words
A combination as defined in claim 6, wherein said eccentric is provided on said first mentioned shaft.
Claim 10
Dependent Claim
41 words
A combination as defined in claim 6, further comprising a second carrier rigid with said fifth gear, said coupling means being operable to transmit torque or to interrupt the transmission of torque from said second carrier to said first mentioned shaft.
Claim 11
Dependent Claim
48 words
A combination as defined in claim 9, wherein said coupling means comprises an element which transmits torque from said first mentioned carrier to said first mentioned shaft when said coupling means interrupts the transmission of torque from said second carrier to said first mentioned shaft, and vice versa.
Claim 12
Dependent Claim
18 words
A combination as defined in claim 10, wherein said element of said coupling means is a spring-biased ball.
Claim 13
Dependent Claim
75 words
A combination as defined in claim 9, further comprising selector meAns for operating said coupling means, said first mentioned shaft having an axial bore and said selector means comprising a plunger supporting said element and non-rotatably received in said bore, said plunger being movable axially of said first mentioned shaft between first and second positions in which said element respectively couples said first mentioned shaft to said first mentioned carrier and to said second carrier.
Claim 14
Dependent Claim
28 words
A combination as defined in claim 12, further comprising means for moving said plunger, including an eccentric coupled to said plunger and actuating means for moving said eccentric.
Claim 15
Dependent Claim
66 words
A combination as defined in claim 3, further comprising a carrier for one of said counterweights, said carrier having a dished first portion coaxial with and surrounding said shaft and a tubular second portion also coaxial with and surrounding said shaft, said one counterweight being provided at the periphery of said first portion and one of said gears being rigid with one portion of said carrier.
Claim 16
Dependent Claim
23 words
A combination as defined in claim 14, further comprising antifriction bearings interposed between said shaft and said tubular second portion of said carrier.
Claim 17
Dependent Claim
42 words
A combination as defined in claim 14, further comprising a second carrier having a tubular portion coaxial with and surrounding said tubular second portion of said first carrier, another of said gears being rigid with the tubular portion of said second carrier.
Claim 18
Dependent Claim
61 words
A combination as defined in claim 1, wherein said control means comprises a slide for moving said pad and an input member operable by said eccentric to move said slide during each stage of movement of said eccentric to thereby orbit said pad or to move said slide during selected stages of movement of said eccentric to thereby reciprocate said pad.
Claim 19
Dependent Claim
37 words
A combination as defined in claim 17, wherein said control means further comprises a muff fixed to said eccentric and detent means installed between said input member and said slide and arranged to operate said input member.
Claim 20
Dependent Claim
51 words
A combination as defined in claim 17, wherein said control means further comprises a frame rigid with said pad and confining said slide, said frame having two sockets and said input member having two projections which move into and from said sockets while said pad reciprocates with respect to said housing.
Claim 21
Dependent Claim
36 words
A combination as defined in claim 19, wherein said input member is turnable with respect to said slide to move said projections into and from alignment with said sockets, said slide having recesses for said projections.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |