CA1101896A - Pressure assemblies - Google Patents
Pressure assembliesInfo
- Publication number
- CA1101896A CA1101896A CA323,905A CA323905A CA1101896A CA 1101896 A CA1101896 A CA 1101896A CA 323905 A CA323905 A CA 323905A CA 1101896 A CA1101896 A CA 1101896A
- Authority
- CA
- Canada
- Prior art keywords
- base plate
- ram
- wedges
- assembly
- support 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B1/00—Vices
- B25B1/06—Arrangements for positively actuating jaws
- B25B1/08—Arrangements for positively actuating jaws using cams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B1/00—Vices
- B25B1/06—Arrangements for positively actuating jaws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
- Jigs For Machine Tools (AREA)
- Clamps And Clips (AREA)
Abstract
ABSTRACT
A pressure assembly comprises a base plate, a ram and a wedge located between the base plate and the ram, the wedge having an inclined face facing the base plate or ram, the facing surface of the base plate or ram being inclined at the same angle and a screw adapted to move the wedge at right angles to the separation of the ram and base plate to alter the separation of the ram and base plate. Preferably a pair of wedges are provided, and preferably their inclined faces are oppositely-inclined. The pressure assembly may be used in conjunction with a support member adapted to be secured to a firm foundation, for example by bolts passing through bores.
The assembly can be used to clamp a workpiece between the ram and a fixed member by engagement of the base plate with the fixed member and by increasing the separation of the ram from the base plate by rotating the screw.
A pressure assembly comprises a base plate, a ram and a wedge located between the base plate and the ram, the wedge having an inclined face facing the base plate or ram, the facing surface of the base plate or ram being inclined at the same angle and a screw adapted to move the wedge at right angles to the separation of the ram and base plate to alter the separation of the ram and base plate. Preferably a pair of wedges are provided, and preferably their inclined faces are oppositely-inclined. The pressure assembly may be used in conjunction with a support member adapted to be secured to a firm foundation, for example by bolts passing through bores.
The assembly can be used to clamp a workpiece between the ram and a fixed member by engagement of the base plate with the fixed member and by increasing the separation of the ram from the base plate by rotating the screw.
Description
This invention relates to a pressure assembly comprising a base plate and a ram and means for moving the pla-te relative to -the ram. In a screw clamp, -the screw acts as the moving means and one turn oE the screw causes the base plate and the ram -to change their separa-tion by the pi-tch of -the screw. The pressure which can be exerted by -the base plate and the ram is limited by the s-trength of the screw.
According to the invention, there is provided a pressure assembly comprising a base plate, a ram, and a pair of wedges located between the base plate and the ram, the wedges having oppositely inclined faces facing the base plate or the ram, the facing surface of the base plate or ram being ~ :
inclined at the same angle, a thrust bearing fixedly mounted relative to the ;
base plate or the ram at one end thereof, and a screw supported in said thrust bearing for rotation and adapted to move the wedges symmetrically in opposite directions at right angles to -the separation oE the ram a~d base plate such tha-t rotation of said screw alters the separation of the ram and base plate. : ~
The pressure assembly may be used in conjunction with a support ~ .
member against which the base plate or the ram may be placed so that pressure may be exerted on a workpiece placed against the o-ther of the base plate and ram on movement of the wedge in the pressure assembly.
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:
An example of the invention will now be described wi.th reference to the accompanying fi~jure, which is an isometric partially exploded view of a pressure assembly, suppor-t cas-ting and face plate.
The pressure assembly shown in the Elgure comprises a base plate 11 and a ram 12 having outwardly facing parallel surl-aces whose separation can be adjusted. If fixed members 13 and 14 are provided with inwardly facing parallel surfaces, the pressure assembly can be placed for example with the surface of base plate 11 engaging the fixed member 13 and the separation between the base plate and the ram can be increased to clamp a workpiece be-tween .
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:
the surface of the ram 12 and -the fixed member 14.
The base plate 11 is a parallel-sided member with a dovetail-shaped groove 21 on the side facing the ram 12.
The ram 12 has a pair of inclined surfaces 22 and 2~ arranged symme-trically facing the base pla-te 11 and each surface 22 and 23 has a dovetail-shaped groove 2~ formed therein.
A pair of wedges 25 and 26 are arranged between the base plate 11 and the ram 12 9 the wedges having surfaces inclined at the same angle as the surfaces 22 and Z3 and facing those surfaces. The wedges 25 and 26 have dovetail-shaped projections (not visible) on both sides for running in the grooves 21 and 24 so -that the facing surfaces of the wedges with the base plate 11 and with the ram 12 are kept in engagement although the wedges can move at right angles to the separation of the ~ase plate 11 :
from the ram 12.
Movement of the wedges 25 and 26 at right angles to the separation o~ the base plate 11 ~rom the ram 12 is controlled by a shaft 31 provided with oppositely directed -threaded portions passing through threaded bores in the wedges 25 and 26 so that rotation of the shaft 31 in one direction will cause the wedges to move towards each other and thus increase the separation of the base plate 11 from the ram 12 and rotation of the shaft 31 in the opposite direction will retract the ram 12 towards the base plate 11 ::
:
::~
through the action of -the grooves 21 ancL 24 with -the lugs on the wedges 25 and 26.
Along the upper edge of the dovetail-shaped grooves 21 and 24 -there is provided a gib or bearing s-trip 32 which is secured by a number o~ adjusting screws 33 provided with locking mlts 34.
Ehd plates 35 are provided at each end of the base plate 11 and formed with bearing housings 36 for supporting -the shaft ~1 for rotation. The ends of the ram 12 slide between the facing surfaces of the end plates 35. The housings 36 are provided with a flat portion 37 marked with an index mark ~or use with a vernier indicator, which indicates the separation of the ram 12 from -the base plate 11 from the rota-tion of the shaft 31.
The fixed member 13 is provided by a support cas-ting having three bores 41 -to receive fixing bolts. The centre bore is formed directly in the casting, but the two outer bores are formed eccentrically in plugs 42 received in larger bores 43 in the casting. Locking screws may be screwed into -threaded apertures 44 in the cas-ting to secure the plugs 42 in their desired position. Rotation of the plugs in opposite directions will cause the member 1~ to be inclined to the line of -the fixing bolts, and movement of the plugs in the opposite directions allows the bolts to be arranged in a triangle. Base plate 11 is provided ~ith threaded bores 45 for securing the base plate 11 to the fixed member 13.
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.. . : . . :
The fixed member 13 may be secured in a con~entional mode to the bed of a machine -tool, which bed has an under-side recess wi-th slo-ts extending from the bed face to the recess. The slots are dimensioned to receive the shanks of securing bolts which pass through the bores 41 and are enlarged at one end for insertion of the securing bolt heads Securing nuts are screwed onto the ends of the bolts which protrude from the top of the bores 41 -to hold the fixed member 13 securely on the bed of the machine tool. Fixed member 13 is cast with rearwardly extending webs 46 for s-trength.
The posi-tioning of the ram 12 relative to the base plate 11 can be achieved in a variety of ways using the sliding wedges 25, 26. ~The inclined faces can be between the base plate 11 and the wedges instead of or~as well as between the ram 12 and the wedges, as illustrated. When :
both sides of the wedges are inclined, the inclinations are of course at different angles.
The illustrated arrangement of the wedges with their narrower ends facing each other puts the shaft ~1 under tension when the~wedge assembly is being expanded, but the reverse arrangement (w1th~the wider ends of the wedges faclng) may be used.
In place~of a shaft with oppositely-handed threads for the two wedges, it is possible -to form the shaft with three differently pitched threaded sectlons all of the same sense, '~
. . . . . . :
: ~;
~ ' ' ~ ' : . ' :`' the threaded section of intermediate pitch co-operating: .
with a bearing on the base or ram or end plates, and the extreme threaded sections co-operating with respective wedges. I~ the intervals between the pitches are equal, there will be an equal and opposite movement of the wedges :~
relative to the component co-operating with the section of intermediate pitch on rotation of the shaft.
:
' ;: : : ~
:
.
.
According to the invention, there is provided a pressure assembly comprising a base plate, a ram, and a pair of wedges located between the base plate and the ram, the wedges having oppositely inclined faces facing the base plate or the ram, the facing surface of the base plate or ram being ~ :
inclined at the same angle, a thrust bearing fixedly mounted relative to the ;
base plate or the ram at one end thereof, and a screw supported in said thrust bearing for rotation and adapted to move the wedges symmetrically in opposite directions at right angles to -the separation oE the ram a~d base plate such tha-t rotation of said screw alters the separation of the ram and base plate. : ~
The pressure assembly may be used in conjunction with a support ~ .
member against which the base plate or the ram may be placed so that pressure may be exerted on a workpiece placed against the o-ther of the base plate and ram on movement of the wedge in the pressure assembly.
:
: ~ :
:
An example of the invention will now be described wi.th reference to the accompanying fi~jure, which is an isometric partially exploded view of a pressure assembly, suppor-t cas-ting and face plate.
The pressure assembly shown in the Elgure comprises a base plate 11 and a ram 12 having outwardly facing parallel surl-aces whose separation can be adjusted. If fixed members 13 and 14 are provided with inwardly facing parallel surfaces, the pressure assembly can be placed for example with the surface of base plate 11 engaging the fixed member 13 and the separation between the base plate and the ram can be increased to clamp a workpiece be-tween .
. ' ' :~ : `: ' :
:
: `:
:
the surface of the ram 12 and -the fixed member 14.
The base plate 11 is a parallel-sided member with a dovetail-shaped groove 21 on the side facing the ram 12.
The ram 12 has a pair of inclined surfaces 22 and 2~ arranged symme-trically facing the base pla-te 11 and each surface 22 and 23 has a dovetail-shaped groove 2~ formed therein.
A pair of wedges 25 and 26 are arranged between the base plate 11 and the ram 12 9 the wedges having surfaces inclined at the same angle as the surfaces 22 and Z3 and facing those surfaces. The wedges 25 and 26 have dovetail-shaped projections (not visible) on both sides for running in the grooves 21 and 24 so -that the facing surfaces of the wedges with the base plate 11 and with the ram 12 are kept in engagement although the wedges can move at right angles to the separation of the ~ase plate 11 :
from the ram 12.
Movement of the wedges 25 and 26 at right angles to the separation o~ the base plate 11 ~rom the ram 12 is controlled by a shaft 31 provided with oppositely directed -threaded portions passing through threaded bores in the wedges 25 and 26 so that rotation of the shaft 31 in one direction will cause the wedges to move towards each other and thus increase the separation of the base plate 11 from the ram 12 and rotation of the shaft 31 in the opposite direction will retract the ram 12 towards the base plate 11 ::
:
::~
through the action of -the grooves 21 ancL 24 with -the lugs on the wedges 25 and 26.
Along the upper edge of the dovetail-shaped grooves 21 and 24 -there is provided a gib or bearing s-trip 32 which is secured by a number o~ adjusting screws 33 provided with locking mlts 34.
Ehd plates 35 are provided at each end of the base plate 11 and formed with bearing housings 36 for supporting -the shaft ~1 for rotation. The ends of the ram 12 slide between the facing surfaces of the end plates 35. The housings 36 are provided with a flat portion 37 marked with an index mark ~or use with a vernier indicator, which indicates the separation of the ram 12 from -the base plate 11 from the rota-tion of the shaft 31.
The fixed member 13 is provided by a support cas-ting having three bores 41 -to receive fixing bolts. The centre bore is formed directly in the casting, but the two outer bores are formed eccentrically in plugs 42 received in larger bores 43 in the casting. Locking screws may be screwed into -threaded apertures 44 in the cas-ting to secure the plugs 42 in their desired position. Rotation of the plugs in opposite directions will cause the member 1~ to be inclined to the line of -the fixing bolts, and movement of the plugs in the opposite directions allows the bolts to be arranged in a triangle. Base plate 11 is provided ~ith threaded bores 45 for securing the base plate 11 to the fixed member 13.
.
.. . : . . :
The fixed member 13 may be secured in a con~entional mode to the bed of a machine -tool, which bed has an under-side recess wi-th slo-ts extending from the bed face to the recess. The slots are dimensioned to receive the shanks of securing bolts which pass through the bores 41 and are enlarged at one end for insertion of the securing bolt heads Securing nuts are screwed onto the ends of the bolts which protrude from the top of the bores 41 -to hold the fixed member 13 securely on the bed of the machine tool. Fixed member 13 is cast with rearwardly extending webs 46 for s-trength.
The posi-tioning of the ram 12 relative to the base plate 11 can be achieved in a variety of ways using the sliding wedges 25, 26. ~The inclined faces can be between the base plate 11 and the wedges instead of or~as well as between the ram 12 and the wedges, as illustrated. When :
both sides of the wedges are inclined, the inclinations are of course at different angles.
The illustrated arrangement of the wedges with their narrower ends facing each other puts the shaft ~1 under tension when the~wedge assembly is being expanded, but the reverse arrangement (w1th~the wider ends of the wedges faclng) may be used.
In place~of a shaft with oppositely-handed threads for the two wedges, it is possible -to form the shaft with three differently pitched threaded sectlons all of the same sense, '~
. . . . . . :
: ~;
~ ' ' ~ ' : . ' :`' the threaded section of intermediate pitch co-operating: .
with a bearing on the base or ram or end plates, and the extreme threaded sections co-operating with respective wedges. I~ the intervals between the pitches are equal, there will be an equal and opposite movement of the wedges :~
relative to the component co-operating with the section of intermediate pitch on rotation of the shaft.
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:
.
.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A pressure assembly comprising a base plate, a ram, and a pair of wedges located between the base plate and the ram, the wedges having oppositely inclined faces facing the base plate or the ram, the facing surface of the base plate or ram being inclined at the same angle, a thrust bearing fixedly mounted relative to the base plate or the ram at one end thereof,and a screw supported in said thrust bearing for rotation and adapted to move the wedges symmetrically in opposite directions at right angles to the separation of the ram and base plate such that rotation of said screw alters the separation of the ram and base plate.
2. An assembly as claimed in claim 1 wherein said screw has portions of oppositely-directed threads for moving said wedges in opposite directions.
3. An assembly as claimed in claim 1 wherein said screw has three threaded portions of different pitches, the portion of intermediate pitch engaging a threaded bore in said thrust bearing and the other portions engaging respective wedges, the difference between the pitches being equal.
4. An assembly as claimed in claim 1 comprising means to secure the ram and the base plate to the wedges to prevent relative movement between the wedges on the one hand and the ram and the base plate on the other hand in the direction of the separation of the ram and base plate.
5. An assembly as claimed in claim 4 wherein said securing means com-prises lugs and grooves which engage each other and which run longitudinally on said base plate, wedges and ram parallel to the axis of the screw.
6. An assembly as claimed in claim 5 wherein said lugs and grooves are dovetail-shaped.
7. An assembly as claimed in claim 5 wherein said grooves are provided with replaceable bearing plates along a surface engaging said lugs.
8. A clamping device comprising a support member adapted to be secured fixedly to a firm foundation and a pressure assembly as claimed in claim 1, said base plate being secured against a face of said support member.
9. A device as claimed in claim 8 wherein said support member is formed with fixing holes through which bolts may pass to secure the support member to a firm foundation and means on said support member for adjusting the inclination of the line joining the fixing holes to said face of said support member.
10. A device as claimed in claim 9 wherein said support member is formed with three fixing holes, said inclination adjusting means being arranged to adjust two of the holes independently relative to the third so that the holes lie either in a single line of variable inclination to said face or at the corners of a triangle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB12,267/78 | 1978-03-29 | ||
| GB1226778 | 1978-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101896A true CA1101896A (en) | 1981-05-26 |
Family
ID=10001419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA323,905A Expired CA1101896A (en) | 1978-03-29 | 1979-03-21 | Pressure assemblies |
Country Status (9)
| Country | Link |
|---|---|
| JP (2) | JPS54133684A (en) |
| AU (1) | AU522292B2 (en) |
| BE (1) | BE875187A (en) |
| CA (1) | CA1101896A (en) |
| DE (1) | DE2912159A1 (en) |
| FR (1) | FR2421030A1 (en) |
| IT (1) | IT1118526B (en) |
| NZ (1) | NZ189905A (en) |
| ZA (1) | ZA791211B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI76012C (en) * | 1982-11-19 | 1988-09-09 | O Kytole Ja Kumpp Ky | System for attaching machinable pieces with a working press to a working machine |
| JPS59156727U (en) * | 1983-04-07 | 1984-10-20 | 株式会社 関西鉄工所 | Blade gap adjustment device in shear |
| US5001015A (en) * | 1986-10-14 | 1991-03-19 | W. R. Grace & Co.-Conn. | Antistatic polyolefin compositions and antistatic polyolefin films made therefrom, including oriented films |
| SE501584C2 (en) * | 1990-08-30 | 1995-03-20 | Rationella Maski Ingf | Fixture for clamping a variety of blanks |
| FR2913622B1 (en) * | 2007-03-13 | 2009-07-31 | Lucien Cuillery | MECHANICAL TRANSLATION CONVERTER |
| DE102007045703A1 (en) * | 2007-09-24 | 2009-04-09 | Harald Weigelt | Wedge drive with slide holder |
| CN104043992B (en) * | 2014-06-09 | 2016-04-20 | 中国南方航空工业(集团)有限公司 | For device and the using method thereof of motor-car unit connecting axle end machining |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1400491A (en) * | 1920-11-05 | 1921-12-13 | Fidelis M Mechling | Clamp |
| US1472982A (en) * | 1922-12-01 | 1923-11-06 | Juvinall Orla Edward | Bench clamp |
| US1869631A (en) * | 1931-02-05 | 1932-08-02 | Illinois Tool Works | Workholding vise |
| CH436857A (en) * | 1966-01-14 | 1967-05-31 | Schrepfer Rudolf | Leveling shoe |
| JPS4836249U (en) * | 1971-09-06 | 1973-05-01 | ||
| DE2249506C3 (en) * | 1971-10-26 | 1975-05-22 | Antonio Dr.-Ing. Genova-Cornigliano Riggio (Italien) | Pneumatically operated vice |
| JPS5250371B2 (en) * | 1972-06-30 | 1977-12-23 | ||
| JPS5039477U (en) * | 1973-08-07 | 1975-04-23 |
-
1979
- 1979-03-14 ZA ZA791211A patent/ZA791211B/en unknown
- 1979-03-14 NZ NZ189905A patent/NZ189905A/en unknown
- 1979-03-19 AU AU45239/79A patent/AU522292B2/en not_active Ceased
- 1979-03-21 CA CA323,905A patent/CA1101896A/en not_active Expired
- 1979-03-28 IT IT67651/79A patent/IT1118526B/en active
- 1979-03-28 JP JP3569479A patent/JPS54133684A/en active Pending
- 1979-03-28 DE DE19792912159 patent/DE2912159A1/en active Granted
- 1979-03-29 BE BE0/194294A patent/BE875187A/en not_active IP Right Cessation
- 1979-03-29 FR FR7907885A patent/FR2421030A1/en active Granted
-
1987
- 1987-12-19 JP JP1987192023U patent/JPH0144289Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63103930U (en) | 1988-07-06 |
| IT1118526B (en) | 1986-03-03 |
| FR2421030A1 (en) | 1979-10-26 |
| BE875187A (en) | 1979-07-16 |
| JPH0144289Y2 (en) | 1989-12-21 |
| AU522292B2 (en) | 1982-05-27 |
| DE2912159C2 (en) | 1988-03-31 |
| DE2912159A1 (en) | 1979-10-04 |
| AU4523979A (en) | 1979-10-04 |
| IT7967651A0 (en) | 1979-03-28 |
| JPS54133684A (en) | 1979-10-17 |
| ZA791211B (en) | 1980-03-26 |
| NZ189905A (en) | 1982-12-07 |
| FR2421030B1 (en) | 1985-03-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |