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WO1996000139A1 - Unite d'entrainement par impulsion de couple destinee a un outil a moteur - Google Patents

Unite d'entrainement par impulsion de couple destinee a un outil a moteur Download PDF

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Publication number
WO1996000139A1
WO1996000139A1 PCT/GB1995/001484 GB9501484W WO9600139A1 WO 1996000139 A1 WO1996000139 A1 WO 1996000139A1 GB 9501484 W GB9501484 W GB 9501484W WO 9600139 A1 WO9600139 A1 WO 9600139A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive unit
axial
dogs
input body
impulse drive
Prior art date
Application number
PCT/GB1995/001484
Other languages
English (en)
Inventor
Michael George Allen
Melvyn Cassell
Christopher John Dudden
Original Assignee
Desoutter Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Desoutter Limited filed Critical Desoutter Limited
Priority to AU27480/95A priority Critical patent/AU2748095A/en
Publication of WO1996000139A1 publication Critical patent/WO1996000139A1/fr

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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/1405—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers for impact wrenches or screwdrivers
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • This invention relates to torque impulse drive units for power tools used for driving a screw-threaded member such as a bolt, a wood screw, or a self-tapping screw, or for running a nut on to a screw thread.
  • Such tools are generally elongate and have a metal or plastics casing. It is known to provide a power tool with a switch arm which, when the tool is grasped initiates the drive and, when it is released, stops the drive, or operatively disconnects the driving energy source if the drive has already been stopped by a cut-out arrangement.
  • Such tools typically have a rearward portion for control of the source of driving energy.
  • This energy may be an electrical supply, but is more typically a compressed air supply.
  • the rearward portion will include valving means and ducting to allow a supply of compressed air into the tool, to discontinue such supply, and to vent the supply to atmosphere as needed in different stages of operation-
  • Known tools also possess a central rotary motor portion, i.e. a pneumatic (or electric) motor, and a forward impulse-drive portion rotatably connected thereto.
  • the forward impulse-drive portion is itself in two parts, an input body and an output body, separate but adjacent and sharing a common axis of rotation.
  • the part nearest the forward end of the tool is the output body, which carries a suitable exchangeable bit (or socket) for engagement with the member to be driven. With no encountered resistance the output body rotates with the input body. When resistance is encountered, torque impulses are intermittently transmitted from the input body to the output body.
  • the input and output bodies are connected by a hydraulic device comprising a rotor mounted in a casing and defining hydraulic spaces between which a pressure differential builds up when the output body encounters resistance to rotation.
  • the rotor and casing rotate together until the resistance brings the output body to a standstill, whereupon the rotor and casing rotate relative to each other, temporarily interconnecting the hydraulic spaces until a position is reached at which the rotor and casing cooperate to close off the hydraulic spaces, thereby transmitting a torque impulse from the input body to the output body.
  • the hydraulic spaces thus vary size as the input unit rotates.
  • a transverse section through the hydraulic spaces i.e. across the tool
  • This is disadvantageous in terms of complexity of structure (and consequent cost) and non-symmetry of operation leading to increased wear and maintenance requirements.
  • the present invention provides a torque impulse drive unit for a power tool, comprising: an input body which is to be driven in rotation about an axis, and an output body rotatable about the said axis relative to the input body, the input body having a cylinder part and a piston part which are coaxial with the said axis and which define an internal hydraulic space, the input body also defining an external hydraulic space, one of the said parts being axially movable relative to the output body; a rotation coupling between the input body and the output body, the coupling comprising a first dog which rotates with the output body and a second dog which rotates with the input body and moves axially with the said movable part, the dogs being capable of riding over one another when rotation of the output body is checked while the input body is driven; a bleed valve which communicates between the said hydraulic spaces so as to permit restricted flow and thereby to control the rate of axial movement of the said movable part as the dogs ride up one another; and a one-way valve which communicates between the said hydraulic
  • the torque resistance at which impulse drive comes into effect may be selected by adjustment of the bleed valve.
  • a duct for communicating between the said hydraulic spaces, the duct being open when the said axially movable part is in the axial position at which the dogs ride over one another, the said part closing the duct until just before the dogs ride over one another. This minimises wear of the dogs.
  • the invention also provides a torque impulse drive unit for a power tool, comprising an input body which is to be driven in rotation about an axis, an output body rotatable about the said axis relative to the input body, and a rotation coupling between the input body and the output body, the coupling comprising two pairs of first and second dogs in which the first dog rotates with the output body and the second dog rotates with the input body, one dog of each pair being axially movable relative to the other and riding over the other when rotation of the output body is checked while the input body is driven, wherein the two pairs of dogs are at different distances from the said axis.
  • the invention further provides a torque impulse drive unit for a power tool, comprising an input body which is to be driven in rotation about an axis, an output body rotatable about the said axis relative to the input body, an impulse clutch which transmits rotation from the input body to the output body until a sufficiently high reaction torque is applied to the output body, whereupon the clutch intermittently transmits torque impulses from the input body to the output body, the clutch including hydraulic spaces between which a pressure differential builds up as the torque transmitted rises, an axial control rod for cutting off a motor driving the input body, an inertial control device on the input body, the rod extending into the, inertial control device, the said device including a latch which has a first position in which it engages the control rod to prevent cutting-off and a second position in which it allows the control rod to be axially urged to a cut-off position, the latch moving from the first position to the second position when a given torque impulse level is reached, and a valve which communicates between the said hydraulic spaces and which is opened by
  • an impulse-drive power tool comprising an elongate casing enclosing a rearward control portion for a driving energy source, an intermediate drive portion, and a forward impulse portion rotary therewith, the impulse portion comprising an input body coaxial with and adjacent to an output body, the bodies being rotatably coupled by dogs capable of riding over one another, the input body comprising a cylinder and piston arrangement coaxial with the axis of rotation and connected to one of the facing coupling dogs so that when the dogs ride over one another as the output body rotation is checked, an internal hydraulic space defined within the said arrangement is placed under pressure, the said internal space communicating with a bleed valve, which restricts the rate of decrease in volume of the space and thus restricts the rate of relative sliding movement of the dogs, and a one-way valve to permit hydraulic fluid to enter as the dogs disengage and the space again increases in volume.
  • the internal space with the piston/cylinder arrangement is defined between a cylinder end and a hollow open-ended piston.
  • the said internal space includes a compression spring biassing the piston to an outer position.
  • a compression spring biassing the piston to an outer position.
  • the use of an internal biassing compression spring of this nature is valuable for running a nut, or driving a screw, against prevailing torque. Examples of this are antivibration nuts or driven wood screws. Typically, (and in contrast to a simple nut-running requirement) both of these exert some intermediate resistance to driving long before the "impulse drive" characteristics are actually needed.
  • the spring bias simple non-impulse drive i. e. without disengagement of the dogs, takes place until a substantial resistance, adequate to start to compress the spring, is present, at which time the tool effectively changes to impulse drive.
  • the one-way valve to the internal piston-cylinder space most preferably comprises a ball located on a seat around an opening at the base of the piston.
  • it may comprise a seated ball valve located over an axial opening at the end of the cylinder; this is especially the case when the tool comprises the pressure-venting arrangement described below.
  • the dogs are preferably such as to permit relative rotation of the tool drive unit and holder for nearly 360" between impacts.
  • a preferred arrangement is to provide two pairs of impacting dogs at different distances from the axis of rotation. This is also applicable to the known type of impulse-drive tool.
  • the tool preferably comprises a two-part inertial control extending around the rotary axis, one part carrying a slidable gate at the said axis to control passage of a longer axial rod extending forward from the rearward control portion as a cut-out actuator for the driving energy source, and the two parts being mounted to come together to cause the said gate to slide open at a predetermined level of torque impulse and thus permit the longer axial rod to slide to a drive cut-out position
  • the tool being further characterized in that a separate shorter axial actuator rod is slidably located with a rearward end adjacent and forward of the gate and a forward end located near the ball of the valve in the cylinder base, whereby movement of the longer axial drive cut-out rod past the gate pushes the separate shorter actuator rod to dislodge the ball and thereby releases the pressure in the internal hydraulic space.
  • This aspect of the invention thus provides an impulse- drive tool which (as is known) cuts out the drive at a predetermined impulse level and which also simultaneously vents the hydraulic chamber so that the tool is ready for further use.
  • the internal space also comprises a pressure-sensitive relief valve to vent the space at a predetermined pressure level.
  • the pressure-sensitive valve is also operatively connected to the rearward control portion for the driving energy source so as to discontinue the drive when the predetermined pressure opens the relief valve.
  • the tool preferably comprises, as the one-way valve, a ball located on a seat extending around an opening in the base of the piston and, as the relief valve, a slide member with a conical end seating in an axial opening in the base of the cylinder.
  • an axial rod extending forward from the rearward control portion as a cut-out actuator for the driving energy source, and with its forward end received in an axial bore in the said slide member at either an outer position or an inner position separated by a latching means releasable so that the end of the axial rod can move from its outer to its inner position in relation to the slide member axial bore, thereby actuating the drive energy cut-off, when the slide member is displaced from its seat by the predetermined pressure.
  • the slide member may itself slide in a bore of a surrounding ducted block against a resetting spring.
  • the latching means may then comprise a plurality of members, e. g. balls, each loosely held in a respective opening, extending between the slide member axial bore and the slide member outer wall, so as to project into the said axial bore when the slide member openings are located within the block bore, thereby to prevent the end of the axial rod from moving to its inner position, but capable of moving from that inner position when the slide member openings lie outside of the block bore, thereby to allow the axial rod to move to its inner position and actuate the driving energy cut-off.
  • members e. g. balls
  • the block bore may have a chamfered rear edge surface
  • the balls may be held in recesses in the slide bore walls (a) through which they may project internally but not pass into the slide bore, and (b) from which they may fall on to the chamfered rear edge surface.
  • This arrangement thus permits automatic pressure release, and thus cessation of drive, at a predetermined pressure (rather than at a predetermined impact force) with simultaneous cut-out of the drive energy.
  • Figure 1 shows a hand-held impulse-drive tool from the side
  • Figure 2 is a longitudinal medial section of the tool shown in Figure 1;
  • Figure 3 shows on a larger scale the rotary impulse portion of Figure 2, also in longitudinal medial section;
  • Figures 3a to c are diagrammatic longitudinal medial sectional views of part of the rotary impulse portion, showing successive stages in its operation;
  • Figure 3d is an enlarged fragmentary exploded perspective view of part of the rotary impulse portion
  • Figure 4 is a transverse section through Figure 3 along the line IV-IV;
  • Figure 5 shows diagrammatically a variant of selectively operable relief valve and exhaust port which can be incorporated into the rotary impulse portion as shown in Figure 3.
  • the power tool illustrated is used for impulse driving of a bit or socket. It has an external plastics casing 1 shaped at regions 2, 3 and 3a to facilitate forceful manual grasping, and has at a rearward end a socket 5 for a compressed air line and at a forward end a holder 4 to accommodate interchangeably a driving bit or socket.
  • the tool further comprises a switch arm 6 pivoted at 7. When the tool is grasped, this arm 6 pivots inwards to lie along the casing (see also Figure 2).
  • a further external switch 8 can be selectively operated to reverse the drive, for example to unscrew a nut or bolt, or to remove a wood screw or the like.
  • the tool shown in Figure 2 in longitudinal medial section, comprises internally a rearward structural zone 9, generally controlling the air supply as described in more detail below, a central pneumatic motor 10 (having a vaned rotor), and a forward rotary impulse structure 11.
  • the arm 6 is also shown in cross-section, and for purposes of description is shown in both its outer position and its inner position.
  • This arm 6 is further shown as provided with an outer extension sleeve 12, capable of being selectively positioned to provide an effective and adjustable extension to the arm.
  • the rearward structure 9 comprises (as known per se) a compressed air inlet duct 13, and a ball valve consisting of a ball 14 and a seat 15.
  • the ball 14 is shown in two positions, i. e. with the valve both shut and open.
  • Transversely extending across the structure 9 is an operating rod 16 for the ball 14, extending between the surface of the ball and an inner face of the external operating arm 6.
  • ball valve opening 18 Downstream of the ball valve 14, 15 is ball valve opening 18 shown closed by a movable closure member 17 with a spring 17a serving to re-set the closure member 17 in this closed position against the outlet of the ball valve opening 18.
  • This closure member is surrounded by chamber 19 which vents via a duct 20 to atmosphere.
  • the closure member also carries one end of a long rod 21 extending through the motor 10 to the rotary impulse structure 11.
  • the motor 10 is also of conventional nature, and will not be described in detail. Basically, the air entering through the opened ball valve 14, 15 forces the closure member 17 on its rod 20 downwards (to an extent governed by a trap member discussed below) and places in communication the air supply line and aerodynamically shaped portions of the motor 10 so that the rotor of the motor rotates upon suitable bearings as conventional in the art.
  • the rotary impulse structure 11 is shown in more detail in Figure 3. It comprises an outer casing 24 having an end cap 25 attached thereto. Within the end cap are ball races 26, 27 carrying an internally hollow shaft 28 connecting to the holder 4. The shaft 28 and the holder 4 are thereby capable of rotating relative to the overall structure 11.
  • sets of dogs are provided, as shown in more detail in Figure 3d, one set 30,31 being provided on a flanged end face of the hollow shaft 28, the other set 30a, 31a being provided similarly at the end of a relatively longitudinally movable piston structure 34.
  • the piston structure 34 comprises a base portion 35 with a central bore 36 which communicates with a larger bore 37 via a divergent throat 38.
  • the throat 38 constitutes a seat for an internal ball 39.
  • a thin wall 40 of the piston structure 34 surrounds a compression spring 40a extending from the base of the piston hollow 41 (defined within the wall 40) to bear upon an end wall of a cylinder structure 42 surrounding the piston.
  • the space within the cylinder structure 42 and the piston hollow 41 communicates via a needle valve 43 (with setting screw 44) and a duct 45, with a space 46 at the forward end of the piston and cylinder arrangement 34.
  • the duct 45 is provided with a ball valve 47, seating at 47a when permitted by a short operating rod 48 extending to a gate structure 49.
  • the nature of the gate structure 49 can be seen from Figure 4, which is a transverse section taken through the forward rotary structure 11 at the level of such structure.
  • the gate itself is a slidable member 50, spring biassed outwardly at 51 to present between the forward end of the long rod 21 and rearward end of the short operating rod 48 an impassable barrier when biassed outwardly as shown.
  • the gate 50 and spring 51 are mounted in a generally circular inertial structure, one component 53 of which houses the gate 50 and its biassing spring 51, and the other, generally L-shaped, component 54 being located in its neutral position as shown to hold the gate 50 to protrude against the spring 51 to act as the barrier between the rods 21 and 48.
  • adjustment members 56 and 58 can be positioned so as to control this movement precisely. If such inward movement does take place, however, the rods 21 and 48 then register axially with the hole 50a in the gate 50 with consequences as discussed below.
  • the device operates as follows.
  • the tool is connected to a compressed air line at 5. It is picked up and grasped naturally around the configured surface at 3, with the thumb resting against the projection 2 (to force the tool longitudinally to the extent that may be required) and the remainder of the hand resting on the smooth portion 3a and, in particular, over the end of operating arm 6. The arm 6 is therefore forced in towards the body of the tool.
  • the inward position of the arm 6 forces the operating rod 16 across the structure 9. This has the effect of displacing the ball 14 from the seat 15.
  • the compressed air from the rearward connection 5 can thus pass downstream of the ball 14, and in particular to the duct or opening 18. It forces back the closure member 17 against spring 17a to the extent permitted by the rod 21 abutting on the gate 50, so that air passes around the closure member 17 and onwards to the pneumatic motor 10, to impart to the motor a rotation in one or other sense as dependent upon the setting of switch 8.
  • the motor is rotationally connected to the structure 11.
  • Fig. 3d shows that one interacting pair of dogs 30, 30a, located as between the end of shaft 28 and the bottom of the piston structure, is radially inward of the other pair 31,31a whereby a balanced structure but a single impact once per revolution is jointly obtained.
  • the upshot of this is that the forward bit or holder 4 is given a rotary movement consisting of a sequence of rapidly applied impulses, one per revolution of the piston/cylinder arrangement.
  • this particular arrangement, involving a biassing spring 40a is of considerable advantage in both manufacture and use. It is in its major structure symmetrical about the axis of the tool, and in particular involves as a pressure chamber the space within an open ended piston within a cylinder, both being essentially of uniform shape and symmetrically arranged about the rotary axis of the tool. Advantage is also achieved by the use of spring 40a in that as a biassing spring it permits operation against a prevailing torque. Whereas in the assembly of a simple nut or bolt there is no effective torque exerted until engagement against the abutment surfaces, in other circumstances such as driving a wood screw or setting an antivibration assembly, there is torque at all stages.
  • Fig. 5 shows an alternative structure to be located in place of the ball 47 seated at 47a to seal the internal space of the cylinders. As described above, with reference to the embodiment shown in Fig.
  • Fig. 5 shows the rearward end of a cylinder arrangement.
  • a major bore 60 At this end there is provided a major bore 60, and an external annular collector space 61 communicating with the low pressure side of the system by a duct 62.
  • a block 63 Within bore 60 there is provided a block 63, with suitable seals 64.
  • the block itself possesses a longitudinal bore, having a small diameter entrance 66 nearest the cylinder end, a larger general diameter 68 throughout most of the length of the block, and an angled or chamfered surrounding edge 70 at the rear of the block 64.
  • a movable slide valving member 72 Within this bore there is located a movable slide valving member 72, of generally cylindrical shape but pointed at one end 73 to seat at the narrow bore 66.
  • This valving member 72 is itself provided with a longitudinal bore 74 and with for example three or four, recesses 76 drilled inward from the outside but being larger at their outer openings 78 than their inner openings 80.
  • Each such recess contains a ball 82, and in the position shown the balls are constrained by the walls of the bore block 63 to project inwardly of the longitudinal bore 74 in the valving member 72.
  • the end of the rod 21 attached as before to the air inlet closure member 17 cannot in the position shown move past the balls 82.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

Un corps (24) d'entrée entraîné est couplé à un corps (28) de sortie au moyen de butées (30, 30a) susceptible de se chevaucher l'une l'autre lors de la rotation du corps (28) de sortie. Une paire de butées (31, 31a) supplémentaire est prévue à une distance différente de l'axe de rotation. Le corps (24) d'entrée possède un cylindre (42) ainsi qu'un piston (44) délimitant un espace hydraulique intérieur communiquant avec un espace (45, 46) hydraulique extérieur via une soupape (43) de purge commandant la vitesse du mouvement axial du piston (44) lorsque les butées se chevauchent l'une l'autre. Une soupape (39) unidirectionnelle permet au fluide hydraulique de retourner dans l'espace hydraulique intérieur lorsque le piston (44) se déplace vers le bas après que les butées se soient chevauchées l'une l'autre. La pression dans l'espace intérieur peut être relâchée juste avant que les butées ne se chevauchent l'une l'autre afin de réduire l'usure par frottement des butées.
PCT/GB1995/001484 1994-06-27 1995-06-23 Unite d'entrainement par impulsion de couple destinee a un outil a moteur WO1996000139A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27480/95A AU2748095A (en) 1994-06-27 1995-06-23 Torque impulse drive unit for power tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9412865.9 1994-06-27
GB9412865A GB9412865D0 (en) 1994-06-27 1994-06-27 Impulse drive tool

Publications (1)

Publication Number Publication Date
WO1996000139A1 true WO1996000139A1 (fr) 1996-01-04

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ID=10757388

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001484 WO1996000139A1 (fr) 1994-06-27 1995-06-23 Unite d'entrainement par impulsion de couple destinee a un outil a moteur

Country Status (3)

Country Link
AU (1) AU2748095A (fr)
GB (1) GB9412865D0 (fr)
WO (1) WO1996000139A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6148642A (en) * 1996-11-06 2000-11-21 Golden Lady S.P.A. Method and machine for the production of knitted garments comprising a body section and legs, in a single production stage and in a single piece
US11213934B2 (en) 2018-07-18 2022-01-04 Milwaukee Electric Tool Corporation Impulse driver
US11724368B2 (en) 2020-09-28 2023-08-15 Milwaukee Electric Tool Corporation Impulse driver
US12325112B2 (en) 2020-09-28 2025-06-10 Milwaukee Electric Tool Corporation Power tool with impulse assembly including a valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210959A (en) * 1963-05-17 1965-10-12 Ingersoll Rand Co Torque device
EP0186316A1 (fr) * 1984-12-13 1986-07-02 Chicago Pneumatic Tool Company Outil portable à force motrice de type à impulsion
GB2170435A (en) * 1985-02-04 1986-08-06 Ingersoll Rand Co Impulse tool having shut off system
GB2240632A (en) * 1990-02-06 1991-08-07 Desoutter Ltd Torque impulse unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210959A (en) * 1963-05-17 1965-10-12 Ingersoll Rand Co Torque device
EP0186316A1 (fr) * 1984-12-13 1986-07-02 Chicago Pneumatic Tool Company Outil portable à force motrice de type à impulsion
GB2170435A (en) * 1985-02-04 1986-08-06 Ingersoll Rand Co Impulse tool having shut off system
GB2240632A (en) * 1990-02-06 1991-08-07 Desoutter Ltd Torque impulse unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6148642A (en) * 1996-11-06 2000-11-21 Golden Lady S.P.A. Method and machine for the production of knitted garments comprising a body section and legs, in a single production stage and in a single piece
US11213934B2 (en) 2018-07-18 2022-01-04 Milwaukee Electric Tool Corporation Impulse driver
US11890726B2 (en) 2018-07-18 2024-02-06 Milwaukee Electric Tool Corporation Impulse driver
US11724368B2 (en) 2020-09-28 2023-08-15 Milwaukee Electric Tool Corporation Impulse driver
US12325112B2 (en) 2020-09-28 2025-06-10 Milwaukee Electric Tool Corporation Power tool with impulse assembly including a valve

Also Published As

Publication number Publication date
AU2748095A (en) 1996-01-19
GB9412865D0 (en) 1994-08-17

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