US3984192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill mount
Assignee: Robert Bosch GmbH
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Filing: 1973-07-13
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Granted: 1976-10-05
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Expires: 1993-07-13
Abstract
Abstract A rotary spindle of a drill mount has a free end provided with a thread whose angle of rise is so selected that its tangent is at least equal to the coefficient of static friction of steel on steel.
Inventors
- 👤 Karl Wanner
- 👤 Reinhardt Hahner
- 👤 Wolfgang Schmid
- 👤 Manfred Bleicher
- 👤 Horst Sigg
- 👤 Jorg Falchle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/11; B23B2226/00; B23B2226/33; B23B2231/00; B23B2231/28; B23B2231/36; B23B2231/365; B25; B25D; B25D2217/00; B25D2217/0057; B25D2217/0065; B25D2217/0069; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/947; Y10T; Y10T279/00; Y10T279/15; Y10T279/17; Y10T279/17615; Y10T279/17623; Y10T279/17632; Y10T279/17931; Y10T279/17941; Y10T279/34; Y10T279/3493; Y10T408/00; Y10T408/89; Y10T408/907; Y10T408/94; Y10T408/95
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
118 words
In a drill mount for connecting a drill bit to a drive unit, a combination comprising a rotary steel spindle member having a free end portion; an auxiliary steel member having a portion provided with a first thread; a second thread formed on said free end portion which is threadedly connected with said first thread, said second thread having an angle of rise the tangent of which is at least equal to the coefficient of static friction of steel on steel, whereby said members can be disengaged without requiring significant force; and braking means co-acting with said spindle and auxiliary members for providing a frictional braking action between said members which suffices to prevent their loosening during operation.
Claim 2
Dependent Claim
118 words
In a drill mount for connecting a drill bit to a drive unit, a combination comprising a rotary steel spindle member having a free end portion; an auxiliary steel member having a portion provided with a first thread; a second thread formed on said free end portion which is threadedly connected with said first thread, said second thread having an angle of rise the tangent of which is at least equal to the coefficient of static friction of steel on steel, whereby said members can be disengaged without requiring significant force; and braking means co-acting with said spindle and auxiliary members for providing a frictional braking action between said members which suffices to prevent their loosening during operation.
Claim 3
Dependent Claim
137 words
In a drill mount for connecting a drill bit to a drive unit, a combination comprising a rotary steel spindle member having a free end portion; an auxiliary steel member having a portion provided with a first thread; a second thread formed on said free end portion which is threadedly connected with said first thread, said second thread having an angle of rise the tangent of which is at least equal to the coefficient of static fraction of steel on steel, whereby said members can be disengaged without requiring significant force; and a braking ring of elastic material provided on said spindle member and co-acting with said auxiliary member for providing a frictional braking action between said members which suffices to prevent the loosening of said members during operation without requiring significant force to disengage said members.
Claim 4
Dependent Claim
137 words
In a drill mount for connecting a drill bit to a drive unit, a combination comprising a rotary steel spindle member having a free end portion; an auxiliary steel member having a portion provided with a first thread; a second thread formed on said free end portion which is threadedly connected with said first thread, said second thread having an angle of rise the tangent of which is at least equal to the coefficient of static fraction of steel on steel, whereby said members can be disengaged without requiring significant force; and a braking ring of elastic material provided on said spindle member and co-acting with said auxiliary member for providing a frictional braking action between said members which suffices to prevent the loosening of said members during operation without requiring significant force to disengage said members.
Claim 5
Dependent Claim
41 words
A combination as defined in claim 2, wherein said braking ring is fixedly connected with one of said members and has a first diameter; and wherein the other of said members has a second diameter which differs from said first diameter.
Claim 6
Dependent Claim
36 words
A combination as defined in claim 3, wherein said auxiliary member further has a cylindrical shoulder portion, and wherein said braking ring acts frictionally with said cylindrical shoulder portion and a part of said second thread.
Claim 7
Dependent Claim
23 words
A combination as defined in claim 3, wherein the frictional braking action of said ring suffices for transmitting substantially 20 Nm of torque.
Claim 8
Dependent Claim
34 words
A combination as defined in claim 5, wherein the frictional braking action of said ring is effective only over the length of approximately 0.5 - 1.5 turns during the threading together of said members.
Claim 9
Dependent Claim
17 words
A combination as defined in claim 2, wherein said braking ring co-acts frictionally with said second thread.
Claim 10
Dependent Claim
35 words
A combination as defined in claim 2, wherein said second thread is an internal thread and said spindle member comprises a circumferential groove; and wherein said ring is lodged in and retained by said groove.
Claim 11
Dependent Claim
14 words
A combination as defined in claim 8, wherein said groove is an inner groove.
Claim 12
Dependent Claim
52 words
A combination as defined in claim 8, wherein said ring is outwardly adjacent said second thread; and wherein said auxiliary member has a shoulder which is engaged by said ring and which has a diameter greater than threads provided on said auxiliary member for mating with said second thread of said spindle.
Claim 13
Dependent Claim
40 words
A combination as defined in claim 8, wherein said ring is inwardly adjacent said second thread; and wherein said auxiliary member has a cylindrical threaded portion adjacent said first thread of said auxililary member and frictionally engaged by said ring.
Claim 14
Dependent Claim
39 words
A combination as defined in claim 8, wherein said spindle member has a outer circumferential groove, and said auxiliary member has a shoulder; and wherein said ring is lodged in said groove and in frictional engagement with said shoulder.
Claim 15
Dependent Claim
23 words
A combination as defined in claim 8, and wherein said auxiliary member has a outer circumferential groove in which said ring is lodged.
Claim 16
Dependent Claim
16 words
A combination as defined in claim 2, wherein said auxiliary member is an elongated drill bit.
Claim 17
Dependent Claim
29 words
A combination as defined in claim 2, wherein said auxiliary member is a pin having one end provided with said first thread, and another end provided with a chuck.
Claim 18
Dependent Claim
16 words
A combination as defined in claim 15, wherein said pin and said chuck are non-releasably connected.
Claim 19
Dependent Claim
32 words
A combination as defined in claim 2, wherein said auxiliary member is a pin having two ends each provided with first threads for connection with said spindle member and a chuck respectively.
Claim 20
Dependent Claim
38 words
A combination as defined in claim 2, wherein said second thread is an external thread and said spindle member includes a shoulder for limiting the extent to which said spindle member can be threaded into said auxiliary member.
Claim 21
Dependent Claim
34 words
A combination as defined in claim 18; and further comprising a coupling sleeve having two identical internal first threads one of which is adapted to mate with said second thread of said spindle member.
Claim 22
Dependent Claim
39 words
a combination as defined in claim 19, wherein said ring is lodged in an inner circumferential groove between said first threads of said sleeve, and is in frictional contact with shoulders on said spindle member and said auxiliary member.
Claim 23
Dependent Claim
36 words
A combination as defined in claim 19, wherein said sleeve has an inner circumferential groove; said ring being lodged in said groove and having frictional contact with a shoulder on at least one of said members.
Claim 24
Dependent Claim
40 words
A combination as defined in claim 19, said sleeve having an outer circumferential groove adjacent each end respectively; and said ring being lodged in said groove and in frictional engagement with shoulders on said spindle member and said auxiliary member.
Claim 25
Dependent Claim
44 words
A combination as defined in claim 18; and further comprising a chuck having a recess provided with an inner first thread adapted to mesh with said second thread of said spindle member, and with an inner circumferential groove in which said ring is lodged.
Claim 26
Dependent Claim
33 words
A combination as defined in claim 2, wherein one of said spindle members and auxiliary members has a circumferential groove; and wherein said ring is a spring ring which engages in said groove.
Claim 27
Dependent Claim
138 words
In a drill mount for connecting a drill bit to a drive unit, a combination comprising a rotary steel spindle member having a free end portion; an auxiliary steel member having a portion provided with a first thread and a cylindrical shoulder portion; a second thread formed on said free end portion which is threadedly connected with said first thread, said second thread having an angle of rise the tangent of which is at least equal to the coefficient of static friction of steel on steel; and a braking ring of elastic material provided on said spindle member and co-acting frictionally with said cylindrical shoulder portion of said auxiliary member for providing a frictional braking action between said members which suffices to prevent the loosening of said members during operation without requiring significant force to disengage said members.
Claim 28
Dependent Claim
138 words
In a drill mount for connecting a drill bit to a drive unit, a combination comprising a rotary steel spindle member having a free end portion; an auxiliary steel member having a portion provided with a first thread and a cylindrical shoulder portion; a second thread formed on said free end portion which is threadedly connected with said first thread, said second thread having an angle of rise the tangent of which is at least equal to the coefficient of static friction of steel on steel; and a braking ring of elastic material provided on said spindle member and co-acting frictionally with said cylindrical shoulder portion of said auxiliary member for providing a frictional braking action between said members which suffices to prevent the loosening of said members during operation without requiring significant force to disengage said members.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |