CA1141202A - Power feed rotary tool - Google Patents
Power feed rotary toolInfo
- Publication number
- CA1141202A CA1141202A CA000355760A CA355760A CA1141202A CA 1141202 A CA1141202 A CA 1141202A CA 000355760 A CA000355760 A CA 000355760A CA 355760 A CA355760 A CA 355760A CA 1141202 A CA1141202 A CA 1141202A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- tool
- working head
- drive train
- threaded 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
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- JCYZMTMYPZHVBF-UHFFFAOYSA-N Melarsoprol Chemical compound NC1=NC(N)=NC(NC=2C=CC(=CC=2)[As]2SC(CO)CS2)=N1 JCYZMTMYPZHVBF-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
Landscapes
- Drilling And Boring (AREA)
Abstract
ABSTRACT
A power feed rotary tool, such as a drill or a tapper, has an electric motor for rotating the working head and a pneumatic system for advancing the working head. A control rod extends from one end of the tool housing, and is displaced together with the working head but does not rotate. The control rod controls the feed stroke of the working head. The electric motor is connected to the tool housing between its ends.
A power feed rotary tool, such as a drill or a tapper, has an electric motor for rotating the working head and a pneumatic system for advancing the working head. A control rod extends from one end of the tool housing, and is displaced together with the working head but does not rotate. The control rod controls the feed stroke of the working head. The electric motor is connected to the tool housing between its ends.
Description
11~12~Z
ER ~EED ROTARY ~`OOL"
~his invention relates to a power feed rotary tool, where the wor~ing head of the tool is rotated by an electric ~no1;or, and is fed towards the work-piece pnewnatically. ~he tool will noLmally be a drill or a tapper, but the invention could also be applied to a screw-driveI or a nut-runner, with or without torque control.
~he i~lvention is a deve~opment of a power-feed drill described in our earlier British Patent 956 081.
~his patent describes a drill where both drill rotation and feed are pneumatically operated. In many instances where a number of such tools are used, the volume of compressed air which is available prevents the use of additional, completely pneumatically operated tools. ~he use of an electric motor to replace the high air consumption rotary pneumatic drive can avoid this problem.
Rotary tools of this type are fre~uently combined in a jib to form a unit capable of drilling a number of adjacent holes simultaneously in a workpiece. In such applications, it is important that the individual tools can be closely spaced, and that the controls for adjusting the depth of feed of each tool be still accessible.
According to the invention, there is provided a .
11~12~)Z
po-vJer feed rotary tool having an electric motor for rotating a working head of the tool, and a pneumatic system for feeding the working head -towards a workp;ece, the tool having an elongate housing w;th the working head at one end of the housing, a drive tra;n wilh;n the housing for rotating the working head, a p;ston within the housing for displacing the working head, as it rotates, towards the workpiece, a control rod at the other end of the housing which is restrained from rotating, but is cor~ected to the drive train so as to be displaced together with the working head, the control rod including an abutment for limiting the displacement of the working head, the electric motor being drivingly connected to the drive train between said ends of the housing.
~ his arrangement, with the control rod extending from the top of the housing 7 makes adjustment of the feed of the working head very easy because no matter how many other tools are surrounding a particular tool, the control abutment is always accessible for adjustment. ~his has always been the case in comple- j tely pneumatically operated tools. In the case of pneumatic tools~ the rotary air motor which rotates the working head can be accommodated completely within the elongate housing and spaced from the working head just sufficiently to leave enough space lZ~Z
for the necessary gears. There is therefore no problem in providing a non-rotating control rod which is displaced with the wor~ing head and which can be connected to the stator of the motor. ~owever, an electric motor with the necessaLy power OUtpllt is of a si~e which must be ~ounted externa]ly of the elonga~te housing. An externally mounted motor is asy~netrica]
re]ative to the axis of the tool and it is not practical to move the motor rogether with the dis-placement l~ovement of the working head.
In a preferred embodiment, the control rod is connected to the drive train via a thrust bearing on the side of the motor driving connection nearest to said other end of the housing. ~he control rod itself can be restrained outside the housing against rotation, and the bearing enables the drive train to continue rotating while the control rod is held stationary.
In an alternative form of embodiment, which may be used with the previously described thrust bearing or on its own, a tie rod extends parallel to the displacement axis of the tool between a part fixed to the control rod and a part on the opposite side of the motor drive connection which does not rotate but is-displaced together with the working head.
~he driving connection between the motor and the drive train is preferably by means of a toothed 114~Z6~2 belt run~ing around appropriately toothed pulleys on the motor output shaft and part of the drive train. A specia]ly adapted device ~ay be provided to tension the drive belt. This dev;ce can be p1ugged ;nto a dr;ve belt housing, and can be opera-ted to pull the motor plate in the direction of tensioning the belt lmtil the spring force of a spring contained in the device is overcome to indicate that the correct tension has been reached in the belt.
It is very advantageous if the control top of the tool can be rotated relative to the rest of the tool. The control top includes the control rod and operating controls and connections to external services. In one preferred form of the invention, the control top is attached to the elongate housing by means of a sleeve having threads of opposite hands at its two ends. At one end, this sleeve screws onto a corresponding -thread on the end of the elongate housing, and at the other end the sleeve screws onto a corresponding thread on the `
control top. A spacer is positioned between the housing and the control top. To alter the position of the control top, the sleeve is slackened suffi-
ER ~EED ROTARY ~`OOL"
~his invention relates to a power feed rotary tool, where the wor~ing head of the tool is rotated by an electric ~no1;or, and is fed towards the work-piece pnewnatically. ~he tool will noLmally be a drill or a tapper, but the invention could also be applied to a screw-driveI or a nut-runner, with or without torque control.
~he i~lvention is a deve~opment of a power-feed drill described in our earlier British Patent 956 081.
~his patent describes a drill where both drill rotation and feed are pneumatically operated. In many instances where a number of such tools are used, the volume of compressed air which is available prevents the use of additional, completely pneumatically operated tools. ~he use of an electric motor to replace the high air consumption rotary pneumatic drive can avoid this problem.
Rotary tools of this type are fre~uently combined in a jib to form a unit capable of drilling a number of adjacent holes simultaneously in a workpiece. In such applications, it is important that the individual tools can be closely spaced, and that the controls for adjusting the depth of feed of each tool be still accessible.
According to the invention, there is provided a .
11~12~)Z
po-vJer feed rotary tool having an electric motor for rotating a working head of the tool, and a pneumatic system for feeding the working head -towards a workp;ece, the tool having an elongate housing w;th the working head at one end of the housing, a drive tra;n wilh;n the housing for rotating the working head, a p;ston within the housing for displacing the working head, as it rotates, towards the workpiece, a control rod at the other end of the housing which is restrained from rotating, but is cor~ected to the drive train so as to be displaced together with the working head, the control rod including an abutment for limiting the displacement of the working head, the electric motor being drivingly connected to the drive train between said ends of the housing.
~ his arrangement, with the control rod extending from the top of the housing 7 makes adjustment of the feed of the working head very easy because no matter how many other tools are surrounding a particular tool, the control abutment is always accessible for adjustment. ~his has always been the case in comple- j tely pneumatically operated tools. In the case of pneumatic tools~ the rotary air motor which rotates the working head can be accommodated completely within the elongate housing and spaced from the working head just sufficiently to leave enough space lZ~Z
for the necessary gears. There is therefore no problem in providing a non-rotating control rod which is displaced with the wor~ing head and which can be connected to the stator of the motor. ~owever, an electric motor with the necessaLy power OUtpllt is of a si~e which must be ~ounted externa]ly of the elonga~te housing. An externally mounted motor is asy~netrica]
re]ative to the axis of the tool and it is not practical to move the motor rogether with the dis-placement l~ovement of the working head.
In a preferred embodiment, the control rod is connected to the drive train via a thrust bearing on the side of the motor driving connection nearest to said other end of the housing. ~he control rod itself can be restrained outside the housing against rotation, and the bearing enables the drive train to continue rotating while the control rod is held stationary.
In an alternative form of embodiment, which may be used with the previously described thrust bearing or on its own, a tie rod extends parallel to the displacement axis of the tool between a part fixed to the control rod and a part on the opposite side of the motor drive connection which does not rotate but is-displaced together with the working head.
~he driving connection between the motor and the drive train is preferably by means of a toothed 114~Z6~2 belt run~ing around appropriately toothed pulleys on the motor output shaft and part of the drive train. A specia]ly adapted device ~ay be provided to tension the drive belt. This dev;ce can be p1ugged ;nto a dr;ve belt housing, and can be opera-ted to pull the motor plate in the direction of tensioning the belt lmtil the spring force of a spring contained in the device is overcome to indicate that the correct tension has been reached in the belt.
It is very advantageous if the control top of the tool can be rotated relative to the rest of the tool. The control top includes the control rod and operating controls and connections to external services. In one preferred form of the invention, the control top is attached to the elongate housing by means of a sleeve having threads of opposite hands at its two ends. At one end, this sleeve screws onto a corresponding -thread on the end of the elongate housing, and at the other end the sleeve screws onto a corresponding thread on the `
control top. A spacer is positioned between the housing and the control top. To alter the position of the control top, the sleeve is slackened suffi-
2~ ciently for the control top -to be manually turned through the desired angle. Once the control top is in the correct position, the sleeve can be ti~htened up against the spacer to hold the top in the correct angular position. Although threads of opposite hand are preferred, the threads could be of the same hand with little differ-ence in -the ~ay that this rotation is carIied out.
The invention wi]l now be further ~cscribed, by way of exarnp1e w;th refelence to the accompany;ng drawings, in which:
~ igure 1 is a cross--section through part of a first embodiment of rotary tool according to the inventionj ~ igure 2 is a cross-section through part of a second embodiment of a rotary tool according to the invention;
and ~ igure 3 is a schematic illustration of a belt tensioning device according to the invention.
In ~igures 1 and 2, the tool has been foreshortened for ease of illustration. ~he lower end of the tool is not shown, but this will be conventional, and will carry a working head at its lower end. Reference may be made to our British Patent 956,081.
~he tool is driven by an electric motor 1. ~his motor is mounted on a casing 2 which is rigidl~
attached to the elongate tool housing 3. The motor 1 drives a toothed pulley wheel 4, and a toothed belt 5 runs around the pulley wheel 4 and around another pulle~ wheel 6 on the axis of the tool. ~he motor 1 is supported on the casing 2 on a motor plate 7. ~he ~1412~:)Z
plate 7 is secured by a number of bolts 8 with mlts 9 which pass through elongate holes in the plate 7.
When the nl~ts 9 are slackened, the plate 7 can be moved in the direct-;on of -tensioning or slackening the belt ~. For corre~t operat;on of the d-rive, it is ;mportant t}lat the belt should be at the correct tension. ~igure 3 shows a device wh;ch can be fitted to the casing 2 to produce the correct tension. ~he device shown in Figure 3 has a base 10 with retaining studs 11. ~he studs 11 fit into correspondingly shaped recesses 12 in the underside of the casing 2.
~he device in ~igure 3 also has abut~ents 13 which contact the side wall of the casing 2, and a threaded adjusting screw 14 which engages in a threaded bore 15 in the motor plate 7. The adjusting screw 14 has a knob 16, and a compression spring 17 is arranged in the device as shown. ~o tension the belt, the nuts 9 are slackened so that the motor plate 7 is free to slide. ~he device is then attached to the casing 2 with the lugs 11 in the recesses 12 and the abutments 13 against the casing side. As the screw 14 is screwed into the threaded bore 15, the plate 7 is moved towards it. As the tension in the belt 5 increases, it becomes progressively more difficult to pull the plate 7 against the tension of the belt, and the spring 17 will compress as the knob 16 and screw 14 continue to be turned. ~he 11412(~Z
knob 16 has a projection 18. When the desired tension in the belt 5 has been reached, this projec-l;ion 18 engages between flanges on -the face 19 of the device and prevents fur-ther rotat;on. ~hen this condition has bcen reached, the nuts 9 can be tightened, and once they have been tightened t,he dev;ce of Figure 3 can be ren~oved from the tool.
~he device thus provides a si~ple and accurate way of achieving -the correct tension in the belt 5. ~he spring 17 can be choosen so that its cha~acteristics produce the desired tension in the belt. For different sizes of tools, different belt tensions may be necessary, and therefore devices with springs 17 of different characteristics can be employed.
The pulley wheel 6 has flanges 20 for locating the belt correctly on the pulley. ~he pulley wheel itself is carried in bearings 21 in a fixed housing part 22 which is in fact integral with the mo-tor pulley casing 2. ~he pulley wheel 6 has an internal bore with splines 2~ which engage with a splined spindle 24. ~he spindle 24 can move longitudinally through the pulley 6 while the splines maintain a driving connection. ~he spindle 24 is connected to the working head (not shown) of the tool, and transmits the necessary rotation from the motor 1.
To provide the feed motion, compressed air is ZOZ
;ntroduced into the tool via an inlet 25 in the control top 26. ~he compressed air is fed through passages (not shown) to a chamber 27, and from cha~ber 27 ia a passage 28 to another chamber 29.
Within the chamber 29, there is a piston 30 with a piston seal 31, and when pressure builds up in chamber 29 the piston 30 is displaced downwards together with the spind]e 24, which thereby slides through the splines 23.
~ A control rod 32 extends from the top of the tool above the control top 26. A cross head 33 is clamped to the control rod 32, but can be unclamped and slid along the length of the control rod to provide a coarse stroke adjustment. A guide pin 34 is fixed in the control top 26 and slides through a bore 35 in the cross head 33, to restrain the control rod 32 from rotating, but to permit the control rod to be displaced along the axis of the tool.
~he control rod 32 iS connected to the upper end of the spindle 24 by a thrust bearing 36. ~ooking at the assembly around the thrust bearing 36 in more detail, it will be seen that the central bore of the control rod 32 is enlarged, and has a plug 37 at its bottom end which forms an abutment for one side of the bearing 36. As the spindle 24 is moved downwards through the pulley wheel 6, it will therefore pull ~14~Z~Z
the control rod 32 wi-th it. Since the control rod 32 iS prevented from rotating by the guide pin 3L~, there will be relative rotation between the spindle 24 and the control rod ~2 at the thrust bearing 36.
With the de-vice s]-~own, it is possible to lotate the control top relative to the rest of the tool.
It will be appreciated that the tool is as~metric because of the presence of the electric motor 1 on one side. When a number of tools are mounted close together to form a unit, they may have to be mounted with the electric motor on each tool facing away from the area of the workpiece. In order to enable the adjust~ents, which are available at the control top, to be set for all the tools simultaneously, it is convenient if the control top of each tool can be rota-ted so that the control tops on all tools are in the same relative orientation to an operator at one side of the unit. To this end, a sleeve 38 is used to connect the control top 26 and the housing part 22. ~he sleeve 38 has threads of opposite hand at each end which mate with corresponding threads on the control top and the housing part 22, respectively. A spacer 39 is provided between the housing part 22 and the control top. In order to alter the orientation of the control top relative to the tool, the sleeve 38 is unscrewed, and an aperture 40 is provided in the ll~lZOZ
circumference of the sleeve for engagement by a suitable tool. Once the sleeve 38 has been slackened, the control top can be rotated by hand -to the correct orientat;on, and the sleeve 38 can tnen be tightened up aga;nst the spacer ~9 to lock the control top in its new orientation~
The tool shown in ~igure 2 is of a larger rating than that shown in ~igure 1, and it will be im~nediately apparent that the electric motor 1a is of a larger size relative to the tool housing.
In ~igure 2, many parts are the same as in ~igure 1, and so they will be designated by the same reference numerals.
With the tool shown in ~igure 2, the thrust bearing 36 may not be man enough for the job. ~o explain why this is so, it is first necessary to be aware that hydraulic check units may be fitted to these tools in the region of the control top. ~he hyraulic check unit is normally set to come into operation just before the drill tip breaks through the workpiece, to check the speed of advance of the drill at the moment of breakthrough. When drilling with the check unit in operation, a considerable load will fall on the thrust bearing 36 because pneumatic pressure is operating to push ~l~lZV2 the spindle 24 downwards, whereas the resilience of the hydraulic check unit is operating to prevent the control rod 32 from being Inoved downwards.
Because of this problem, the tool shown in ~igure 2 is provided with a t;e rod 4-1 extending between the cross head 33 and a part 42 which MOveS
with the piston 30. Neither the part 42 nor the piston 30 rotate during operation of the tool. ~he tie rod 41 passes through a sleeved bore 43 in -the ~otor drive pu]ley housing 2. ~his tie rod prevents excessive strain being put on the thrust bearing 36, and may make it possible to dispense with the thrust bearing 36 altogether. When the tie rod 41 is in position, the cross head 33 and piston 30 both advance together at the same speed. ~he use of tie rod 41 can make it possible to dispense with the guide pin 34 shown in ~igure 1.
~he electric motor 1 or 1a is of a standard type which is readily available commercially. It is possible to exchange the drive pulley 4 for another pulley of a different diameter in order to alter the transmission ratio.
Because the control top and control rod in the tools described can be constructed identically with pneumatically driven tools, it is possible to arrange both pneumatically and electrically driven tools ` 1141Z~Z
together in the same unit, and to carry out identical adjustments for both types of tool. This can be a very sign;ficant advantage when electrically driven tools are used in places whe:re pneu~atically driven tools are already in use, and where no more pneumatic tools can be used because of a shortage of comp-essed air.
The invention wi]l now be further ~cscribed, by way of exarnp1e w;th refelence to the accompany;ng drawings, in which:
~ igure 1 is a cross--section through part of a first embodiment of rotary tool according to the inventionj ~ igure 2 is a cross-section through part of a second embodiment of a rotary tool according to the invention;
and ~ igure 3 is a schematic illustration of a belt tensioning device according to the invention.
In ~igures 1 and 2, the tool has been foreshortened for ease of illustration. ~he lower end of the tool is not shown, but this will be conventional, and will carry a working head at its lower end. Reference may be made to our British Patent 956,081.
~he tool is driven by an electric motor 1. ~his motor is mounted on a casing 2 which is rigidl~
attached to the elongate tool housing 3. The motor 1 drives a toothed pulley wheel 4, and a toothed belt 5 runs around the pulley wheel 4 and around another pulle~ wheel 6 on the axis of the tool. ~he motor 1 is supported on the casing 2 on a motor plate 7. ~he ~1412~:)Z
plate 7 is secured by a number of bolts 8 with mlts 9 which pass through elongate holes in the plate 7.
When the nl~ts 9 are slackened, the plate 7 can be moved in the direct-;on of -tensioning or slackening the belt ~. For corre~t operat;on of the d-rive, it is ;mportant t}lat the belt should be at the correct tension. ~igure 3 shows a device wh;ch can be fitted to the casing 2 to produce the correct tension. ~he device shown in Figure 3 has a base 10 with retaining studs 11. ~he studs 11 fit into correspondingly shaped recesses 12 in the underside of the casing 2.
~he device in ~igure 3 also has abut~ents 13 which contact the side wall of the casing 2, and a threaded adjusting screw 14 which engages in a threaded bore 15 in the motor plate 7. The adjusting screw 14 has a knob 16, and a compression spring 17 is arranged in the device as shown. ~o tension the belt, the nuts 9 are slackened so that the motor plate 7 is free to slide. ~he device is then attached to the casing 2 with the lugs 11 in the recesses 12 and the abutments 13 against the casing side. As the screw 14 is screwed into the threaded bore 15, the plate 7 is moved towards it. As the tension in the belt 5 increases, it becomes progressively more difficult to pull the plate 7 against the tension of the belt, and the spring 17 will compress as the knob 16 and screw 14 continue to be turned. ~he 11412(~Z
knob 16 has a projection 18. When the desired tension in the belt 5 has been reached, this projec-l;ion 18 engages between flanges on -the face 19 of the device and prevents fur-ther rotat;on. ~hen this condition has bcen reached, the nuts 9 can be tightened, and once they have been tightened t,he dev;ce of Figure 3 can be ren~oved from the tool.
~he device thus provides a si~ple and accurate way of achieving -the correct tension in the belt 5. ~he spring 17 can be choosen so that its cha~acteristics produce the desired tension in the belt. For different sizes of tools, different belt tensions may be necessary, and therefore devices with springs 17 of different characteristics can be employed.
The pulley wheel 6 has flanges 20 for locating the belt correctly on the pulley. ~he pulley wheel itself is carried in bearings 21 in a fixed housing part 22 which is in fact integral with the mo-tor pulley casing 2. ~he pulley wheel 6 has an internal bore with splines 2~ which engage with a splined spindle 24. ~he spindle 24 can move longitudinally through the pulley 6 while the splines maintain a driving connection. ~he spindle 24 is connected to the working head (not shown) of the tool, and transmits the necessary rotation from the motor 1.
To provide the feed motion, compressed air is ZOZ
;ntroduced into the tool via an inlet 25 in the control top 26. ~he compressed air is fed through passages (not shown) to a chamber 27, and from cha~ber 27 ia a passage 28 to another chamber 29.
Within the chamber 29, there is a piston 30 with a piston seal 31, and when pressure builds up in chamber 29 the piston 30 is displaced downwards together with the spind]e 24, which thereby slides through the splines 23.
~ A control rod 32 extends from the top of the tool above the control top 26. A cross head 33 is clamped to the control rod 32, but can be unclamped and slid along the length of the control rod to provide a coarse stroke adjustment. A guide pin 34 is fixed in the control top 26 and slides through a bore 35 in the cross head 33, to restrain the control rod 32 from rotating, but to permit the control rod to be displaced along the axis of the tool.
~he control rod 32 iS connected to the upper end of the spindle 24 by a thrust bearing 36. ~ooking at the assembly around the thrust bearing 36 in more detail, it will be seen that the central bore of the control rod 32 is enlarged, and has a plug 37 at its bottom end which forms an abutment for one side of the bearing 36. As the spindle 24 is moved downwards through the pulley wheel 6, it will therefore pull ~14~Z~Z
the control rod 32 wi-th it. Since the control rod 32 iS prevented from rotating by the guide pin 3L~, there will be relative rotation between the spindle 24 and the control rod ~2 at the thrust bearing 36.
With the de-vice s]-~own, it is possible to lotate the control top relative to the rest of the tool.
It will be appreciated that the tool is as~metric because of the presence of the electric motor 1 on one side. When a number of tools are mounted close together to form a unit, they may have to be mounted with the electric motor on each tool facing away from the area of the workpiece. In order to enable the adjust~ents, which are available at the control top, to be set for all the tools simultaneously, it is convenient if the control top of each tool can be rota-ted so that the control tops on all tools are in the same relative orientation to an operator at one side of the unit. To this end, a sleeve 38 is used to connect the control top 26 and the housing part 22. ~he sleeve 38 has threads of opposite hand at each end which mate with corresponding threads on the control top and the housing part 22, respectively. A spacer 39 is provided between the housing part 22 and the control top. In order to alter the orientation of the control top relative to the tool, the sleeve 38 is unscrewed, and an aperture 40 is provided in the ll~lZOZ
circumference of the sleeve for engagement by a suitable tool. Once the sleeve 38 has been slackened, the control top can be rotated by hand -to the correct orientat;on, and the sleeve 38 can tnen be tightened up aga;nst the spacer ~9 to lock the control top in its new orientation~
The tool shown in ~igure 2 is of a larger rating than that shown in ~igure 1, and it will be im~nediately apparent that the electric motor 1a is of a larger size relative to the tool housing.
In ~igure 2, many parts are the same as in ~igure 1, and so they will be designated by the same reference numerals.
With the tool shown in ~igure 2, the thrust bearing 36 may not be man enough for the job. ~o explain why this is so, it is first necessary to be aware that hydraulic check units may be fitted to these tools in the region of the control top. ~he hyraulic check unit is normally set to come into operation just before the drill tip breaks through the workpiece, to check the speed of advance of the drill at the moment of breakthrough. When drilling with the check unit in operation, a considerable load will fall on the thrust bearing 36 because pneumatic pressure is operating to push ~l~lZV2 the spindle 24 downwards, whereas the resilience of the hydraulic check unit is operating to prevent the control rod 32 from being Inoved downwards.
Because of this problem, the tool shown in ~igure 2 is provided with a t;e rod 4-1 extending between the cross head 33 and a part 42 which MOveS
with the piston 30. Neither the part 42 nor the piston 30 rotate during operation of the tool. ~he tie rod 41 passes through a sleeved bore 43 in -the ~otor drive pu]ley housing 2. ~his tie rod prevents excessive strain being put on the thrust bearing 36, and may make it possible to dispense with the thrust bearing 36 altogether. When the tie rod 41 is in position, the cross head 33 and piston 30 both advance together at the same speed. ~he use of tie rod 41 can make it possible to dispense with the guide pin 34 shown in ~igure 1.
~he electric motor 1 or 1a is of a standard type which is readily available commercially. It is possible to exchange the drive pulley 4 for another pulley of a different diameter in order to alter the transmission ratio.
Because the control top and control rod in the tools described can be constructed identically with pneumatically driven tools, it is possible to arrange both pneumatically and electrically driven tools ` 1141Z~Z
together in the same unit, and to carry out identical adjustments for both types of tool. This can be a very sign;ficant advantage when electrically driven tools are used in places whe:re pneu~atically driven tools are already in use, and where no more pneumatic tools can be used because of a shortage of comp-essed air.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A power feed rotary tool having a working head and an electric motor for rotating the working head, a pneumatic system for feeding the working head towards a workpiece, an elongate housing with the working head at one end thereof, a drive train within the housing for rotating the working head, a piston within the housing for feeding the working head, as it rotates, towards the work piece, a control rod at the other end of the housing, the rod being restrained from rotating but connected to the drive train so as to be fed together with the working head, the control rod including an abutment for limiting the feeding of the working head, the electric motor being drivingly connected to the drive train between said ends of the housing.
2. A tool as claimed in claim 1, including a thrust bearing which connects the control rod to the drive train.
3. A tool as claimed in claim 1 or 2, including a tie-rod parallel to the tool axis and which connects the control rod to the drive train, a crosshead on the control rod and a non-rotating part of the drive train, said tie-rod being mounted between the crosshead and the non-rotating part of the drive train.
4. A tool as claimed in claim 1, having a toothed drive belt, a toothed driving pulley on the motor output shaft and a toothed driven pulley in the drive train, said toothed belt providing a driving connection between said toothed pulley on the motor output shaft and said toothed pulley in the drive train.
5. A tool as claimed in claim 4, in which said toothed pulley in the drive train is not movable axially of the tool, the tool having a central splined bore, which is located in said toothed pulley, and a corresponding splined elongate spindle, which passes through the bore, and said elongate spindle being longitudinally movable through the bore as the working head is fed towards the work piece, so that a driving connection between the pulley and the spindle is maintained as the working head is displaced.
6. A tool as claimed in claim 1, having a control top, which is at said other end of the elongate housing, and a sleeve and a spacer between the control top and the remainder of the housing, threads at either end of the sleeve being engageable with corresponding threads on the control top and the remainder of the housing respectively, and the spacer holding the control top and the remainder of the housing apart so that the control top can be rotated to any angular position relative to the housing, and the sleeve tightened to secure the top.
7. A tool as claimed in claim 4, provided with a device for tensioning the drive belt, the device comprising an adjust-able motor mount for mounting said motor on said housing, means on said device for engaging said housing to retain said device in a fixed position relative to said housing, means including a threaded member for engaging said adjustable motor mount, the threaded member being rotatable to draw the driving pulley away from the driven pulley, a compression spring associated with the threaded member, and means for preventing rotation of the threaded member when a predetermined degree of compression of the spring has been reached to provide the correct tension in the drive belt.
8. A tool as claimed in claim 5, provided with a device for tensioning the drive belt, the device comprising an adjust-able motor mount for mounting said motor on said housing, means on said device for engaging said housing to retain said device in a fixed position relative to said housing, means including a threaded member for engaging said adjustable motor mount, the threaded member being rotatable to draw the driving pulley away from the driven pulley, a compression spring associated with the threaded member, and means for preventing rotation of the threaded member when a predetermined degree of compres-sion of the spring has been reached to provide the correct tension in the drive belt.
9. A tool as claimed in claim 7 or 8, wherein the thread-ed member is attached to a knob, and the knob has an axial projection which approaches a stationary part of the device as the spring is compressed, and engages said stationary part when said predetermined degree of compression has been reached to prevent rotation of the threaded member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000355760A CA1141202A (en) | 1980-07-09 | 1980-07-09 | Power feed rotary tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000355760A CA1141202A (en) | 1980-07-09 | 1980-07-09 | Power feed rotary tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141202A true CA1141202A (en) | 1983-02-15 |
Family
ID=4117378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000355760A Expired CA1141202A (en) | 1980-07-09 | 1980-07-09 | Power feed rotary tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1141202A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107138955A (en) * | 2017-06-30 | 2017-09-08 | 烟台市方寸机械有限公司 | Borehole chasing bar and G words folder drilling and tapping system |
-
1980
- 1980-07-09 CA CA000355760A patent/CA1141202A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107138955A (en) * | 2017-06-30 | 2017-09-08 | 烟台市方寸机械有限公司 | Borehole chasing bar and G words folder drilling and tapping system |
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| Date | Code | Title | Description |
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| MKEX | Expiry |