CA1094336A - A boss for mounting on a shaft - Google Patents
A boss for mounting on a shaftInfo
- Publication number
- CA1094336A CA1094336A CA314,902A CA314902A CA1094336A CA 1094336 A CA1094336 A CA 1094336A CA 314902 A CA314902 A CA 314902A CA 1094336 A CA1094336 A CA 1094336A
- Authority
- CA
- Canada
- Prior art keywords
- link
- boss
- shaft
- discontinuity
- ring member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Pivots And Pivotal Connections (AREA)
Abstract
ABSTRACT OF DISCLOSURE
A boss for mounting on a shaft comprising a discontinuous ring member, with a link bridging the discontinuity, a pivotable lever, and an eccentric drive connection between the lever and the link, whereby pivoting of the lever produces relative movement between the link and at least one side of the discontinuity to alter the size thereof to facilitate clamping and unclamping of the boss on the shaft. The effective length of the link is adjustable by a nut to allow for pre-setting the tension in the link. An overcentre mechanism retains the lever in its locking position.
A boss for mounting on a shaft comprising a discontinuous ring member, with a link bridging the discontinuity, a pivotable lever, and an eccentric drive connection between the lever and the link, whereby pivoting of the lever produces relative movement between the link and at least one side of the discontinuity to alter the size thereof to facilitate clamping and unclamping of the boss on the shaft. The effective length of the link is adjustable by a nut to allow for pre-setting the tension in the link. An overcentre mechanism retains the lever in its locking position.
Description
331~ `
DES~RIPTION
~ield of the invention This invention concerns fittings for machines and in particular a boss for mounting on a shaft where adjustment of the position of the boss is required in relation to the shaft.
Background to the invention -There are many situations where the axial and/or ~: rotational position of a boss has to be reset with respect to the shaft or other bosses upon the shaft and it is an object of the inventio:n to provide an improved clamping mechanism for such a boss which will allow the latter to be unclamped and ~oved laterally and/or rotationally along the shaft to a new position and reclamped in a matter of seconds Prior art United States Patent No. 3871777 to Sauer discloses a clamping means for a split rotary anvil consisting of two rings having a discontinuity, rotatable upon the :~ .
shaft. The clamping means consist of a tongue 30 bridging the discontinuity, fixed to a bore in one ring half and extending to a second bore in the other ring half. The second bore contains an eccentric shaft 9O
which is engageable with the cut-out portion 38 of the tongue so that rotation of the eccentric shaft results in clamping or unclamping of the discontinuity The shaft may be rotated by means of sockets 66 or 68, ~1.0~g~336 and a locking gear 120 is provided for loclcing the shaft against rotation. However, Sauer lacks a lever attached to the shaft which may be positioned so that when the lever is in its lockin~ position, ; the eccentric portion of the shaft is in an over centre position so that the tension in the link acts to retain the lever in its locking position.
; Sauer also lacks any means for pre-adjusting the ~ ;
link of the tongue.
It is most important that the eccentric portion is over centre when the lever is in its locking position to provide a self locking effect. If no such over centre provision is ensured the lever would tend to move during the use of the boss thereby unclamping the boss, and making its use impracticalO
The invention The invention consits of a boss for moun-ting on a shaft comprising in combination: a discontinuous ring member; a link bridging the discontinuity; a pivotable lever carried by the boss and movable through ~ -an over cen-tre position into a rest position; and an eccentric drive connection between the lever and the link, the eccentric drive connection being attached to one end of said link and including non-eccentric portions turning in axially aligned bores; whereby pivoting of the lever into and out of the rest position produces relative movement between the link and at least one side of the discontinuity to alter the size 3~OE;
thereof to facilitate c~amping and unclamping of the boss on the shaft.
The locking position of the pivotal lever corresponds to an over centre position of the eccentric throw line of the eccentric drive connection between the lever and ring member so that the tension in the link acts along such a line as to retain the pivotable lever in its locking position.
Depending on the application the internal surface of the ring member which contacts the shaft is either smooth and/or coated with a low friction ma-terial such as polytetrafluroethylene, and/or may be grooved or otherwise formed for keying to the shaft, or is lined with friction material such as brake or clutch liningO
The invention is of particular application to the mounting of cutting knives or sa~sor slotting tools or creasing toolsO The tool may be integral with the boss or may be a separate component mounted thereonO
The invention will now be described by way of e~ample with reference to the accompanying drawings.
In the drawings Fig.l is a plan view of one embodiment of the invention, FigO2 is an end view of the device of Fig.l in cross-section on the line VIII, VI~I in Fig. 1 and, FigO3 is a cross-section on the line IX, I~ of Fig.2 of part of the device.
3~ j - 4 - :
D_scription of the draw~ngs A tool boss adapted to be clamped onto a circular shaft 113 is formed from two arcuate halves 10" and 12" which are joined at one end by a bolt 94' the head of which is contained within a counter-bore 16.
The threaded shank of the bolt is screwed into an axially aligned threaded hole 18 in the opposed ends of bo s s half 120 The opposite ends of the two arcuate halves 10"
and 12" are joined by a tie link 94' (shown in ~ig.2) This has a circular aperture 24 at the upper end within which is received an eccentric portion ~8 of a pin 82~
The pin 82 includes non-eccentric sections 34' and 36' which rotate in aligned bores 38' and 114 and is retained by an enlarged head at one end and at the other end by a washer 117 and socket screw 116.
A lever 50 is a-ttached to pin 82 for turning the latter about its axisO A recess 52 in the suxface of arcuate half lO't accommodates the lever 50 which is curved so that its outer surface conforms to the outer surface of the arcuate half 10 when the lever fits into the recess 52.
An extension recess 54 accommodates a laterally extending flange by which the lever is lifted Lifting the lever 50 out of the recess 52 rotates the eccentric section 28 and the relative angular 33~6 position of the lever 50 and eccentric section ~8 is such that clockwise rotation of the lever 50 urges the tie link 94' out of the arcuate half lO~o The extreme rest position of the lever 50 within the recess 52 is designed to be just beyond the maximum withdrawal position of the eccentric section 28 when acting on the tie link 94' so that the eccentric section 28 has been rotated over centre when the lever 50 is pushed completely into the recess 52. In this way the tension acting in the link 20 when the lever 50 is fully in the recess 52 urges the lever 50 into the recess 52 and restraills it from leaving the recess.
The radii of the internal circular pro~iles of the arcuate halves lO" and 12'r and the distance between their centres o curvature (which may not be co-incident) and the distance between their opposing end surfaces adjacent to tie link 94' (when mounted upon the shaft and claMped together by bolt 14 at the one end only) are chosen so that, with no tension in tie link 94'g the boss is a sliding fit upon the shaft (113). When tie link 94' is tensioned, the two arcuate halves are strained to conform to the surface of the shaft over a sufficient area and with sufficient pressure to ensure the required resistance to movement of the boss relative to the shaftO
A~ial registration of the two arcuate halves is maintained at all times by a key 58 and co-operating slot 60 formed in the opposed end surfaces of t~e two arcuate halves 10" amd 12~o A similar key and slot shown in dotted outline are formed in the opposed end faces which are normally clamped -together by means of the bolt 14.
The action of the device may be improved by arranging that at least one of the surfaces which are clamped by bolt 14 is slightly inclined so -that the effective size of the central hole of the boss is enlarged to increase the clearance between -the boss and the shaft when openedO
The lower end of the lin~ 94' is formed with a screw thread 103 on which is th:readed a nut 1020 Screwing :~
up the nut 102 increases the tension in the lin~0
DES~RIPTION
~ield of the invention This invention concerns fittings for machines and in particular a boss for mounting on a shaft where adjustment of the position of the boss is required in relation to the shaft.
Background to the invention -There are many situations where the axial and/or ~: rotational position of a boss has to be reset with respect to the shaft or other bosses upon the shaft and it is an object of the inventio:n to provide an improved clamping mechanism for such a boss which will allow the latter to be unclamped and ~oved laterally and/or rotationally along the shaft to a new position and reclamped in a matter of seconds Prior art United States Patent No. 3871777 to Sauer discloses a clamping means for a split rotary anvil consisting of two rings having a discontinuity, rotatable upon the :~ .
shaft. The clamping means consist of a tongue 30 bridging the discontinuity, fixed to a bore in one ring half and extending to a second bore in the other ring half. The second bore contains an eccentric shaft 9O
which is engageable with the cut-out portion 38 of the tongue so that rotation of the eccentric shaft results in clamping or unclamping of the discontinuity The shaft may be rotated by means of sockets 66 or 68, ~1.0~g~336 and a locking gear 120 is provided for loclcing the shaft against rotation. However, Sauer lacks a lever attached to the shaft which may be positioned so that when the lever is in its lockin~ position, ; the eccentric portion of the shaft is in an over centre position so that the tension in the link acts to retain the lever in its locking position.
; Sauer also lacks any means for pre-adjusting the ~ ;
link of the tongue.
It is most important that the eccentric portion is over centre when the lever is in its locking position to provide a self locking effect. If no such over centre provision is ensured the lever would tend to move during the use of the boss thereby unclamping the boss, and making its use impracticalO
The invention The invention consits of a boss for moun-ting on a shaft comprising in combination: a discontinuous ring member; a link bridging the discontinuity; a pivotable lever carried by the boss and movable through ~ -an over cen-tre position into a rest position; and an eccentric drive connection between the lever and the link, the eccentric drive connection being attached to one end of said link and including non-eccentric portions turning in axially aligned bores; whereby pivoting of the lever into and out of the rest position produces relative movement between the link and at least one side of the discontinuity to alter the size 3~OE;
thereof to facilitate c~amping and unclamping of the boss on the shaft.
The locking position of the pivotal lever corresponds to an over centre position of the eccentric throw line of the eccentric drive connection between the lever and ring member so that the tension in the link acts along such a line as to retain the pivotable lever in its locking position.
Depending on the application the internal surface of the ring member which contacts the shaft is either smooth and/or coated with a low friction ma-terial such as polytetrafluroethylene, and/or may be grooved or otherwise formed for keying to the shaft, or is lined with friction material such as brake or clutch liningO
The invention is of particular application to the mounting of cutting knives or sa~sor slotting tools or creasing toolsO The tool may be integral with the boss or may be a separate component mounted thereonO
The invention will now be described by way of e~ample with reference to the accompanying drawings.
In the drawings Fig.l is a plan view of one embodiment of the invention, FigO2 is an end view of the device of Fig.l in cross-section on the line VIII, VI~I in Fig. 1 and, FigO3 is a cross-section on the line IX, I~ of Fig.2 of part of the device.
3~ j - 4 - :
D_scription of the draw~ngs A tool boss adapted to be clamped onto a circular shaft 113 is formed from two arcuate halves 10" and 12" which are joined at one end by a bolt 94' the head of which is contained within a counter-bore 16.
The threaded shank of the bolt is screwed into an axially aligned threaded hole 18 in the opposed ends of bo s s half 120 The opposite ends of the two arcuate halves 10"
and 12" are joined by a tie link 94' (shown in ~ig.2) This has a circular aperture 24 at the upper end within which is received an eccentric portion ~8 of a pin 82~
The pin 82 includes non-eccentric sections 34' and 36' which rotate in aligned bores 38' and 114 and is retained by an enlarged head at one end and at the other end by a washer 117 and socket screw 116.
A lever 50 is a-ttached to pin 82 for turning the latter about its axisO A recess 52 in the suxface of arcuate half lO't accommodates the lever 50 which is curved so that its outer surface conforms to the outer surface of the arcuate half 10 when the lever fits into the recess 52.
An extension recess 54 accommodates a laterally extending flange by which the lever is lifted Lifting the lever 50 out of the recess 52 rotates the eccentric section 28 and the relative angular 33~6 position of the lever 50 and eccentric section ~8 is such that clockwise rotation of the lever 50 urges the tie link 94' out of the arcuate half lO~o The extreme rest position of the lever 50 within the recess 52 is designed to be just beyond the maximum withdrawal position of the eccentric section 28 when acting on the tie link 94' so that the eccentric section 28 has been rotated over centre when the lever 50 is pushed completely into the recess 52. In this way the tension acting in the link 20 when the lever 50 is fully in the recess 52 urges the lever 50 into the recess 52 and restraills it from leaving the recess.
The radii of the internal circular pro~iles of the arcuate halves lO" and 12'r and the distance between their centres o curvature (which may not be co-incident) and the distance between their opposing end surfaces adjacent to tie link 94' (when mounted upon the shaft and claMped together by bolt 14 at the one end only) are chosen so that, with no tension in tie link 94'g the boss is a sliding fit upon the shaft (113). When tie link 94' is tensioned, the two arcuate halves are strained to conform to the surface of the shaft over a sufficient area and with sufficient pressure to ensure the required resistance to movement of the boss relative to the shaftO
A~ial registration of the two arcuate halves is maintained at all times by a key 58 and co-operating slot 60 formed in the opposed end surfaces of t~e two arcuate halves 10" amd 12~o A similar key and slot shown in dotted outline are formed in the opposed end faces which are normally clamped -together by means of the bolt 14.
The action of the device may be improved by arranging that at least one of the surfaces which are clamped by bolt 14 is slightly inclined so -that the effective size of the central hole of the boss is enlarged to increase the clearance between -the boss and the shaft when openedO
The lower end of the lin~ 94' is formed with a screw thread 103 on which is th:readed a nut 1020 Screwing :~
up the nut 102 increases the tension in the lin~0
Claims (14)
1. A boss for mounting on a shaft comprising in combination:
a discontinuous ring member;
a link bridging the discontinuity;
a pivotable lever carried by the boss and moveable through an over centre position into a rest position; and an eccentric drive connection between the lever and the link, the eccentric drive connection being attached so one end of said link and including non-eccentric portions turning in axially aligned bores;
whereby pivoting of the lever into and out of the rest position produces relative movement between the link and at least one side of the discontinuity to alter the size thereof to facilitate clamping and unclamping of the boss on the shaft.
a discontinuous ring member;
a link bridging the discontinuity;
a pivotable lever carried by the boss and moveable through an over centre position into a rest position; and an eccentric drive connection between the lever and the link, the eccentric drive connection being attached so one end of said link and including non-eccentric portions turning in axially aligned bores;
whereby pivoting of the lever into and out of the rest position produces relative movement between the link and at least one side of the discontinuity to alter the size thereof to facilitate clamping and unclamping of the boss on the shaft.
2. A boss according to claim 1, wherein the discontinuous ring member is coated with a low friction material.
3. A boss according to claim 1, wherein the discontinuous ring member has a grooved internal surface.
4. A boss according to claim 1, wherein the discontinuous ring member has a surface lined with friction material.
5. A boss according to claim 1 wherein the non-eccentric portions are received in axially aligned bores in the ring member on one side of the discontinuity therein.
6. A boss according to claim 1 wherein the other end of the link is formed with a screw thread and the said other opposed end on the other side of the discontinuity includes a seating, an internally threaded member adapted to abut thereagainst the link is screwed into the said internally threaded member.
7. A boss according to claim 6 wherein the seating is concave and the said internally threaded member includes a part spherical surface which co-operates with the concave seating to allow the said internally threaded member to tilt.
8. A boss according to claim 1 wherein the internal surface of the ring member is smooth.
9. A boss according to claim 1 when mounted on a shaft.
10. A boss for mounting on a shaft comprising in combination:
a discontinuous ring member;
a link bridging the discontinuity;
a pivotable lever carried by the boss; and an eccentric drive connection being attached to one end of said link and including non-eccentric portions;
axially aligned boxes formed in the ring member on one side of the discontinuity with which the said non-eccentric portions are received;
a screw thread formed at the other end of the link;
an internally screw threaded member engages on the threaded end of the link and a seating within the ring member, on the said other side of the discontinuity which seating surrounds the threaded end of the link, the internally threaded member being adapted to abut against the said seating, as the internally threaded member is screwed onto the threaded end of the link, to permit the latter to be pretensioned.
a discontinuous ring member;
a link bridging the discontinuity;
a pivotable lever carried by the boss; and an eccentric drive connection being attached to one end of said link and including non-eccentric portions;
axially aligned boxes formed in the ring member on one side of the discontinuity with which the said non-eccentric portions are received;
a screw thread formed at the other end of the link;
an internally screw threaded member engages on the threaded end of the link and a seating within the ring member, on the said other side of the discontinuity which seating surrounds the threaded end of the link, the internally threaded member being adapted to abut against the said seating, as the internally threaded member is screwed onto the threaded end of the link, to permit the latter to be pretensioned.
11. A boss as set forth in claim 10 when mounted on a shaft.
12. A boss as set forth in claim 11 further comprising a tool integrally formed with the boss.
13. A boss as set forth in claim 11 further comprising a tool removably screwed thereto.
14. A boss for mounting on a shaft comprising in combination:
a discontinuous ring member;
a link bridging the discontinuity;
first actuator means carried by the boss;
an eccentric drive connection between the first actuator means and the link, the eccentric drive connection being attached to one end of said link whereby pivoting of the first actuator means produces relative movement between the link and at least one side of the discontinuity, to alter the width thereof to facilitate clamping and unclamping of the boss on the shaft, and second actuator means for adjusting the tension in the link to allow the tension to be preset.
150 A boss for mounting on a shaft according to
14. A boss for mounting on a shaft comprising in combination:
a discontinuous ring member;
a link bridging the discontinuity;
first actuator means carried by the boss;
an eccentric drive connection between the first actuator means and the link, the eccentric drive connection being attached to one end of said link whereby pivoting of the first actuator means produces relative movement between the link and at least one side of the discontinuity, to alter the width thereof to facilitate clamping and unclamping of the boss on the shaft, and second actuator means for adjusting the tension in the link to allow the tension to be preset.
150 A boss for mounting on a shaft according to
claim 14 further comprising in combination:
a seating within the ring member;
a screw thread formed at the said other end of the link, the screw-threaded end thereof protruding through said seating; and an internally screw-threaded member engages on the threaded end of the link and adjustable therealong to abut against said seating as the internally threaded member is screwed onto the thread against the link to permit the tension in the latter to be preset, said internally screw-threaded member constituting said second actuator means.
a seating within the ring member;
a screw thread formed at the said other end of the link, the screw-threaded end thereof protruding through said seating; and an internally screw-threaded member engages on the threaded end of the link and adjustable therealong to abut against said seating as the internally threaded member is screwed onto the thread against the link to permit the tension in the latter to be preset, said internally screw-threaded member constituting said second actuator means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37078/77A GB1543469A (en) | 1976-09-08 | 1977-09-06 | Fastener guiding means for fastener driving tools |
| GB37078/77 | 1978-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094336A true CA1094336A (en) | 1981-01-27 |
Family
ID=10393554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA314,902A Expired CA1094336A (en) | 1977-09-06 | 1978-10-30 | A boss for mounting on a shaft |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1094336A (en) |
-
1978
- 1978-10-30 CA CA314,902A patent/CA1094336A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |