POWER TOOL
A power tool having a housing assembly and a drive component that is housed in the housing assembly. The housing assembly has a first housing component, a second housing component, at least one set of mating conically-shaped features, and at least one fastener. Each set of mating conically-shaped features includes a first cone portion and a second cone portion. The first cone portion of each set of mating conically-shaped features is coupled to the first housing component and has a frusto-conically-shaped exterior surface. The second cone portion of each set of mating conically-shaped features is coupled to the second housing component and has a frusto-conically-shaped interior surface that is engaged with the frusto-conically-shaped exterior surface of an associated first cone portion. Each fastener is received through an associated pair of the first and second cone portions and is threadably engaged to one of the first and second housing components.
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This application is a division of U.S. Ser. No. 13/546,759 filed Jul. 11, 2012, which is a continuation of U.S. Ser. No. 12/610,762 filed Nov. 2, 2009 (now U.S. Pat. No. 8,251,158 issued Aug. 28, 2012), which claims the benefit of U.S. Provisional Application No. 61/112,741 filed Nov. 8, 2008. The disclosure of each of the aforementioned applications is incorporated by reference as if fully set forth in detail herein.
INTRODUCTIONThe present disclosure generally relates to power tools, including power tools such as rotatable drill/drivers, hammer drill/drivers, hammer drills, screwdrivers, rotary hammers and rotatable cutting devices. More particularly, the present disclosure relates to a transmission for a power tool and a housing for a power tool.
A power tool is described in U.S. Pat. Nos. 6,431,289 and 7,314,097. These power tools employ a three-speed transmission and a switching mechanism. Additionally, the '097 patent employs a mode change mechanism. While such power tools are relatively robust, compact and inexpensive, there nonetheless remains a need in the art for an improved power tool that incorporates an improved transmission and/or housing configuration.
SUMMARYThis section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
In one form, the present teachings provide a power tool that includes a housing, a motor, a trigger, an output spindle, a multi-speed transmission and a switch mechanism. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and is coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The multi-speed transmission couples the motor and the output member. The switch mechanism includes an actuator, a rail, a switch, a first biasing spring, and a second biasing spring. The actuator is movable along a longitudinal axis of the multi-speed transmission between a plurality of positions. The actuator is engaged to one or more members of the multi-speed transmission at each of the plurality of actuator positions such that the multi-speed transmission operates in a corresponding one of a plurality of different overall speed reduction ratios. The actuator is non-rotatably but axially slidably engaged to the housing. The rail is fixedly coupled to the actuator and is received through the switch such that the switch is mounted on the rail for sliding movement thereon. The first biasing spring is disposed between the actuator and the switch and biases the switch away from the actuator. The second biasing spring is disposed between the switch and an end of the rail opposite the actuator and biases the switch away from the end of the rail.
In another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member, a multi-speed transmission and a switch mechanism. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The multi-speed transmission couples the motor and the output member. The switch mechanism has a switch and an actuator. The switch is movable between a first switch position, a second switch position, and a third switch position. The actuator is non-rotatably but axially slidably disposed in the housing between a first actuator position, a second actuator position, and a third actuator position. The actuator is engaged to one or more members of the multi-speed transmission at each of the first, second and third actuator positions such that the multi-speed transmission operates in a corresponding one of a plurality of different overall speed reduction ratios. The multi-speed transmission and the switch mechanism are configured such that: the actuator will move with the switch when the switch is moved from the second switch position to the third switch position, the switch can move relative to the actuator when the switch is moved from the third switch position to the second switch position or from the second switch position to the first switch position, and the switch can move relative to the actuator when the switch is moved from the first switch position to the second switch position.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The transmission includes a first planetary stage and a second planetary stage. The first planetary stage includes a planet carrier and a plurality of planet gears. The planet carrier includes a plurality of pins onto which the planet gears are journally mounted. The second planetary stage comprises a sun gear having an outer diameter onto which a plurality of sun gear teeth is formed. The pins of the planet carrier are mounted to the sun gear radially inward of the sun gear teeth and no portion of the sun gear that transmits torque is bigger in diameter than the outside diameter of the sun gear as measured across the sun gear teeth.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The transmission includes a first planetary stage and a second planetary stage. The first planetary stage comprises a compound planet gear having a first ring gear, a second ring gear, and a first planet gear portion, which is meshingly engaged to the first ring gear, and a second planet gear portion that is coupled for rotation with the first planet gear portion and meshingly engaged with the second ring gear. The second planetary stage comprises a third ring gear that is axially movable between a first position, in which the third ring gear is meshingly engaged with a rotating component of the transmission, and a second position in which the third ring gear is disengaged from the rotating component.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The transmission includes a planetary stage having compound planetary gears with a first portion that is engaged to a first ring gear and a second portion that is engaged to a second ring gear. The compound planetary gears are not timed to another gear in the transmission.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The transmission includes a planetary stage having a ring gear, a planet carrier and a plurality of planet gears. The planetary gears are meshingly engaged with the ring gear and journally supported on pins of the planet carrier. Adjacent ones of the pins are spaced apart by an angular spacing. Two or more different angular spacings are employed to thereby space the planet gears unevenly about the ring gear.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The power tool also includes a mode change mechanism having a cam, a cam follower, a planet gear and a ring gear. The cam is rotatably mounted in the housing, while the cam follower is engaged to the cam and non-rotatably but axially slidably mounted in the housing. The planet gear is meshingly engaged with the ring gear and teeth formed on the cam. Rotation of the ring gear generates corresponding rotation or the cam to cause axial translation of the cam follower in the housing. The cam follower is employed to selectively lock-out a torque clutch, position an axially movable hammer ratchet into a zone where it may be engaged by a rotary hammer ratchet that is mounted on the output spindle, or both.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The power tool also includes a spindle lock with a bushing that is coupled to an output member of the transmission at a first interface and to the output spindle at a second interface. At least one of the first and second interfaces is defined by a female portion and a male portion that is received in the female portion. The female portion includes a plurality of first V-shaped sidewalls that have peaks that face radially inwardly, while the male portion comprising a plurality of second V-shaped sidewalls that are engaged the first V-shaped sidewalls. Each of the first V-shaped sidewalls is defined by a first interior angle, and each of the second V-shaped sidewalls being defined by a second interior angle that is smaller than the first interior angle to rotationally couple the female portion and male portion in a manner that provides limited rotational movement there between.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The power tool further includes a clutch having a plurality of follower members and a clutch spring. The follower members are received between a clutch profile on a ring gear of the transmission and the clutch spring. The clutch spring biases the follower members into engagement with the clutch profile. The clutch spring is an annular wave spring having a non-linear spring rate and preferably, a non-linear spring rate in which a plot depicting a load exerted by the clutch spring as a function of clutch spring deflection has a distinct knee between a first portion, which is generally defined by a first spring rate, and a second portion that is generally defined by a second spring rate that is greater than the first spring rate.
In still another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The power tool further includes a torque clutch and a clutch bypass member. The torque clutch includes a clutch profile, which is coupled to a ring gear of the transmission, and a follower member that is biased into engagement with the clutch profile to resist rotation of the ring gear when a magnitude of the torque output from the power tool does not exceed a clutch torque. The clutch bypass member includes a plurality of lugs that are non-rotatably but slidably engaged to the housing. The clutch bypass member is axially movable between a first position, in which lugs are axially separated from the ring gear, and a second position in which the lugs are received within the ring gear such that the lugs are positioned radially inwardly of the clutch profile.
In yet another form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The transmission includes a planetary stage having a ring gear, the ring gear being axially movable between a first position and a second position to cause a change in a speed ratio of the transmission, the power tool further comprising a spring that is mounted coaxially about the transmission to bias the ring gear into one of the first and second positions
In a further form, the present teachings provide a power tool with a housing, a motor, a trigger, an output member and a transmission. The housing defines a handle and a body into which the motor is received. The trigger is mounted to the handle and coupled to the motor. The trigger is configured to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member. The housing includes a gear case, which houses at least a portion of the transmission, and a handle housing, which houses the motor. A plurality of features is formed onto the handle housing and the gear case to align the two to a common rotary axis. The features can comprise mating frusto-conically shaped surfaces.
In another form, the present teachings provide a power tool having a housing, a motor received in the housing, a trigger, an output member and a transmission. The housing defines a handle. The trigger is mounted to the handle and coupled to the motor. The trigger is adapted to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The multi-speed transmission couples the motor the motor and the output member and comprises a planetary stage with a planet carrier, a plurality of planet gears, a first ring gear and a second ring gear. The planet carrier has a carrier body and a plurality of pins that are fixed to the carrier body. Each of the compound planetary gears is rotatably mounted on an associated one of the pins. Each of the compound planetary gears has a first planet gear, which is meshingly engaged to the first ring gear, and a second planet gear that is meshingly engaged to the second ring gear and coupled to the first planet gear for common rotation. The pins are spaced circumferentially about the carrier body such that each pair of adjacent pins is spaced apart by a spacing angle. At least two different spacing angles are employed to space the pins about the carrier body.
In still another form, the present teachings provide a power tool having a housing, a motor received in the housing, a trigger, an output member and a transmission. The housing defines a handle. The trigger is mounted to the handle and coupled to the motor. The trigger is adapted to control operation of the motor in response to an input provided by an operator of the power tool by coupling the motor to a source of power. The transmission couples the motor and the output member and comprises a planetary stage with a planet carrier, a plurality of planet gears, and a ring gear, the planet carrier having a carrier body and a plurality of pins that are fixed to the carrier body, each of the planet gears being rotatably mounted on associated one of the pins, wherein the pins are spaced circumferentially about the carrier body such that each pair of adjacent pins is spaced apart by a spacing angle, and wherein at least two different spacing angles are employed to space the pins about the carrier body.
In a further form, the present teachings provide a power tool that includes a housing assembly and a drive component. The housing assembly has a first housing component, a second housing component, at least one set of mating conically-shaped features, and at least one fastener. Each set of mating conically-shaped features includes a first cone portion and a second cone portion. The first cone portion of each set of mating conically-shaped features is coupled to the first housing component and has a frusto-conically-shaped exterior surface, while the second cone portion of each set of mating conically-shaped features is coupled to the second housing component and has a frusto-conically-shaped interior surface that is engaged with the frusto-conically-shaped exterior surface of an associated first cone portion. Each fastener is received through an associated pair of the first and second cone portions and is threadably engaged to one of the first and second housing components. The drive component is housed in the housing assembly and includes at least one of a motor, a transmission and a clutch.
In still another form, the present teachings provide a power tool having a motor, an output spindle, a transmission that is configured to transmit power between the motor and the output spindle, and a housing assembly into which the motor, the output spindle and the transmission are received. The housing assembly has a first housing component, a second housing component and a plurality of threaded fasteners. The first housing component has a plurality of first cone portions and a first axial end face, while the second housing component has a plurality of second cone portions and a second axial end face. Each of the threaded fasteners is received through an associated pair of the first and second cone portions and applies a clamping force that maintains the first and second axial end faces in abutment with one another. The first and second cone portions are configured to orient the first and second housing components to a common axis.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. The drawings are illustrative of selected teachings of the present disclosure and do not illustrate all possible implementations. Similar or identical elements are given consistent identifying numerals throughout the various figures.
With reference to
The housing 12 can include a pair of mating housing shells 40 and a gear case 42. The housing shells 40 can cooperate to define a handle portion 44 and a body portion 46. The handle portion 44 can include a battery pack mount 48, to which the battery pack 30 can be removably coupled, and a switch mount 50. The trigger assembly 28, which can include a trigger 52 and a trigger switch 54, and be coupled to the switch mount 50. The body portion 46 can define a motor cavity 56. The motor assembly 14, which can include a rotatable output shaft 58, can be received in the motor cavity 56. The gear case 42 can include a rear case portion 60, a front case portion 62 and an annular wall member 64 that can couple the rear and front case portions 60 and 62 to one another. The rear case portion 60 can be removably coupled to the housing shells 40 via a plurality of fasteners (not specifically shown) to close a front end of the body portion 46.
With reference to
The transmission assembly 16 can be received between the motor assembly 14 and the gear case 42 and can transmit rotary power between the output shaft 58 of the motor assembly 14 and the output spindle 20 (
Those of skill in the art will appreciate that various components of the power tool 10, such as the motor assembly 14, the chuck 26, the trigger assembly 28 and the battery pack 30, can be conventional in their construction and operation and as such, need not be discussed in significant detail herein. Reference may be made to a variety of publications for a more complete understanding of the construction and operation of the conventional components of the power tool 10, including U.S. Pat. Nos. 6,431,289; 7,314,097; 5704,433; and RE37,905, the disclosures of which are hereby incorporated by reference as if fully set forth in detail herein.
Transmission AssemblyWith reference to
With reference to
With reference to
With reference to
With additional reference to
A spindle lock 250 can be disposed between the output reduction carrier 222 and the output spindle 20 to lock the output spindle 20 against rotation when torque is applied to the output spindle 20 from the chuck 26 (
Returning to
While the planetary gears of the sets of first and second input planetary gears 126 and 128 can have any desired number of teeth, it may be desirable in some instance to configure the planetary gears of the set of first input planetary gears 126 such that the quantity n1 of their teeth is a multiple of the quantity n2 of the teeth of the planetary gears of the set of second input planetary gears 128. In this regard a ratio of the quantity n1 to the quantity n2 can yield an integer (e.g., 2, 3). This can be desirable as it can eliminate the need to time the planetary gears to one or more other geared elements of the input stage 110 (or any other portion of the reduction gearset assembly 100 (FIG. 2)), as well as permit the compound planetary gears 134 to be identically formed (i.e., such that the planetary gears of the sets of first and second input planetary gears 126 and 128 are maintained in the same relative rotational orientation to one another). As will be appreciated, timing of gears involves the positioning of two or more of the gears into a predetermined rotational position relative to one another to permit engagement between predetermined teeth.
We have noted that in some situations, the space between the teeth of the planetary gears of the first set of input planetary gears 126 and the first input ring gear 130 and/or the teeth of the planetary gears of the second set of input planetary gears 128 and the second input ring gear 132 that results from factors including intended clearance, tolerances and backlash can be sufficiently large so as to permit one or more of the planetary gears of the sets of first and second input planetary gears 126 and 128 to be aligned one tooth out of phase with its associated ring gear (i.e., the first and second input ring gears 130 and 132, respectively). While assembly fixtures could be employed to reduce or eliminate the possibility that the input stage 110 could be misassembled, we discovered that it is also possible to make a slight alteration to the input stage 110 to shift the compound planetary gears 134 in the manner that will be described in detail below so that misassembly of the input stage would not be possible.
With reference to
Returning to
Due in part to the enlarged diameter of the reduction gearset assembly 100 and the shortened length of the planetary gears of the reduction gearset assembly 100, it was possible to enhance the efficiency of the reduction gearset assembly 100 through a reduction in the diameter of the pins 144 (
Returning to
The switch 310 can include a plate structure 330, a switch member 332, a pair of second detent members 334 and a pair of bushings 336. The plate structure 330 can be received in pair of slots 340 (
Each of the housing shells 40 can define a pair of detent mounts 360 that can be configured to hold the first detent members 312. The first detent members 312 can be leaf springs having a raised protrusion 370 and a pair of tabs 372. The detent mounts 360 can include a pair of tab recesses 374, which can be configured to receive an associated one of the tabs 372, and a contoured platform 376 that can support the portion of the first detent member 312 disposed between the tabs 372. The contoured platform 376 can include a platform recess 378 into which the raised protrusion 370 may be moved when the switch 310 is moved between the first, second and third positions. The raised protrusions 370 of the first detent members 312 are configured to engage an associated one of the detent recesses 348 that are formed in the plate structure 330
Each of the rails 314 can include a generally cylindrical rail body 380 and a head portion 382 that can be relatively larger in diameter than the rail body 380. The rails 314 can be received through the bushing apertures 350 such that the bushings 336 are slidably mounted on the rail bodies 380.
The collar 316 can be an annular structure that can include a pair of mounts 400, an internal engagement feature 402, a fourth external engagement feature 404 and a fifth external engagement feature 406. An end of the rail bodies 380 opposite the head portions 382 can be received into the mounts 400 to fixedly couple the rails 314 to the collar 316. In the particular example provided, the rail bodies 380 are press-fit into the mounts 400, but it will be appreciated that other coupling techniques, including bonding, adhesives, pins, and threaded fasteners, could be employed to couple the rails 314 to the collar 316. The internal engagement feature 402 can be formed about an inner diameter of the collar 316 and can be sized to engage the first external engagement feature 152 (
Each first biasing spring 318 can be mounted on an associated one of the rail bodies 380 between the head portion 382 and the first end face 352 of an associated one of the bushings 336. Each second biasing spring 320 can be mounted on an associated one of the rail bodies 380 between the second end face 354 of an associated one of the bushings 336 and the collar 316. With additional reference to
With reference to
With reference to
Operation in the high speed ratio is schematically illustrated in
Returning to
Operation in the medium speed ratio is schematically illustrated in
With renewed reference to
Operation in the low speed ratio is schematically illustrated in
Returning to
In instances where the switch 310 is to be moved from the first position to the second position but the second external engagement feature 164 (
In instances where the switch 310 is to be moved from the second position to the third position but the third external engagement feature 202 (
In instances where the switch 310 is to be moved from the third position to the second position but the third set of internal teeth 200 (
In instances where the switch 310 is to be moved from the second position to the first position but the internal engagement feature 402 formed on the collar 316 is not aligned to the first external engagement feature 152 (
With reference to
Returning to
With reference to
The hammer mechanism 22 can be disengaged by positioning the second cam 602 in a rearward position (by the mode change mechanism 24, as will be described in greater detail, below) that is axially rearward of the first cam 600 by a distance that is sufficient to prevent engagement between the first and second cams 600 and 602 when the output spindle 20 is pushed into its rearward most position. The hammer mechanism 22 can be engaged by positioning the second cam 602 in a forward position (by the mode change mechanism 24) where the first cam 600 can contact the second cam 602 when the output spindle 20 is pushed axially rearward. As the first cam 600 rotates with the output spindle 20 and the second cam 602 is non-rotatably coupled to the gear case 42, the first tapered ramps 610 of the first cam 600 can alternately engage and disengage the second tapered ramps 612 of the second cam 602 to cause axial movement of the output spindle 20 when the power tool 10 is operated and a rearwardly directed force is applied to the output spindle 20.
Mode Change MechanismWith reference to
With reference to
The idler gear 702 can be rotatably mounted on the gear case 42 and can include teeth that can be meshingly engaged to the internal teeth 720 on the mode collar 700. In the example provided, an idler gear aperture is formed in the front case portion 62 of the gear case 42 and an axle 750 is fitted through the idler gear 702 into the annular wall member 64 of the gear case 42.
With reference to
The clutch bypass member 706 can include an annular body 800 and a plurality of lugs 802. The annular body 800 can define a central bore 810, a plurality of guide ways 812 and a first cam follower 814. The guide ways 812 can extend through the annular body 800 generally parallel to a longitudinal axis of the central bore 810. The first cam follower 814 can be sized to engage the clutch bypass surface 770 on the mode selection cam plate 704. The first cam follower 814 can include a plurality of first lands 820, a plurality of second lands 822, and a plurality of tapered ramps 824. Rotation of the mode selection cam plate 704 into a first position can locate the second lands 822 on the annular body 800 in abutment with the first lands 780 on the clutch bypass surface 770 to position the clutch bypass member 706 in a forward position. Rotation of the mode selection cam plate 704 into a second position or a third position can locate the first and second lands 820 and 822 in abutment with the first and second lands 780 and 782, respectively, as well as the tapered ramps 824 in abutment with the tapered ramps 784 such that the clutch bypass member 706 is disposed in a rearward position. The lugs 802 can be circumferentially spaced apart about the exterior periphery of the annular body 800 and can extend rearwardly from the annular body 800 generally perpendicular to the longitudinal axis of the central bore 810. The lugs 802 can have any desired shape but in the particular example provided, have a shape that corresponds to a shape of a plurality of first guide passages 830 (
The hammer activation member 708 can include an annular body 850 and a plurality of lugs 852 that can define a second cam follower 854. The annular body 850 can define a central bore 856 into which the second cam 602 can be received. The second cam 602 can be fixedly coupled to the annular body 850 through any appropriate means, including an interference fit. The lugs 852 can be circumferentially spaced apart about the exterior periphery of the annular body 850 and can extend rearwardly from the annular body 850 generally perpendicular to the longitudinal axis of the central bore 856. The lugs 852 can have any desired shape but in the particular example provided, have a shape that corresponds to a shape of the guide ways 812 in the annular body 800 of the clutch bypass member 706. The guide ways 812 can cooperate with the lugs 852 to inhibit relative rotation between the hammer activation member 708 and the gear case 42, as well as to guide the hammer activation member 708 as it translates along an axis that is coincident with the longitudinal axis 342 of the reduction gearset assembly 100 (
With reference to
In operation, the mode collar 700 can be moved between a first mode position, a second mode position and a third mode position to cause corresponding movement of the mode selection cam plate 704 between the first position, the second position and the third position, respectively.
With reference to
With reference to
With reference to
It will be appreciated that the above description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. While specific examples have been described in the specification and illustrated in the drawings, it will be understood by those of ordinary skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure as defined in the claims. Furthermore, the mixing and matching of features, elements and/or functions between various examples is expressly contemplated herein, even if not specifically shown or described, so that one of ordinary skill in the art would appreciate from this disclosure that features, elements and/or functions of one example may be incorporated into another example as appropriate, unless described otherwise, above. Moreover, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular examples illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out the teachings of the present disclosure, but that the scope of the present disclosure will include any embodiments falling within the foregoing description and the appended claims.
Claims
1. A power tool comprising:
- a housing assembly having a first housing component, a second housing component, at least one set of mating conically-shaped features, and at least one fastener, each set of mating conically-shaped features including a first cone portion and a second cone portion, the first cone portion of each set of mating conically-shaped features being coupled to the first housing component and having a frusto-conically-shaped exterior surface, the second cone portion of each set of mating conically-shaped features being coupled to the second housing component and having a frusto-conically-shaped interior surface that is engaged with the frusto-conically-shaped exterior surface of an associated first cone portion, each fastener being received through an associated pair of the first and second cone portions and being threadably engaged to one of the first and second housing components; and
- a drive component that comprises at least one of a motor, a transmission and a clutch, the drive component being housed in the housing assembly.
2. The power tool of claim 1, wherein each fastener is threaded into the first housing component.
3. The power tool of claim 1, wherein the first housing component includes a pair of housing shells that are fastened together.
4. The power tool of claim 1, wherein each first cone portion has a first axial end face that abuts a second axial end face of an associated one of the second cone portions.
5. The power tool of claim 4, wherein each first cone portion as a portion that is deformed by a corresponding one of the second cone portions.
6. The power tool of claim 1, wherein the sets of mating conically-shaped features are located on the first and second housing components so as to align the first and second housing components about a rotational axis of the drive component.
7. A power tool comprising:
- a motor;
- an output spindle
- a transmission that is configured to transmit power between the motor and the output spindle; and
- a housing assembly into which the motor, the output spindle and the transmission are received, the housing assembly having a first housing component, a second housing component and a plurality of threaded fasteners, the first housing component having a plurality of first cone portions and a first axial end face, the second housing component having a plurality of second cone portions and a second axial end face, each of the threaded fasteners being received through an associated pair of the first and second cone portions and applying a clamping force that maintains the first and second axial end faces in abutment with one another, the first and second cone portions being configured to orient the first and second housing components to a common axis.
8. The power tool of claim 7, wherein the first cone portions are received into the second cone portions.
9. The power tool of claim 8, wherein the threaded fasteners exert a clamping force that deforms the first cone portions.
10. The power tool of claim 7, wherein the first housing component includes a pair of housing shells that are fastened together.
11. A power tool comprising:
- a motor having an output shaft;
- a transmission driven by the output shaft of the motor;
- an output spindle in driving engagement with the transmission;
- a handle housing formed of a pair of handle shells, the handle housing defining a housing cavity into which the motor is received, each of the handle shells defining a first axial end face and having a frusto-conical protrusion extending from the first axial end face, the frusta-conical protrusions being aligned about axes that are parallel to the output shaft;
- a gear case defining a case cavity, a second axial end face and a plurality of fastener apertures, the transmission being received into the case cavity, the second axial end face being abutted against the first axial end faces, the fastener apertures having a frusta-conical portion into which the frusta-conical protrusions are matingly received to thereby align the fastener apertures to the axes of the frusta-conical protrusions; and
- a plurality of fasteners received through the fastener apertures and threadaby engaged to the handle housing to fixedly but removably couple the gear case to the handle housing.
12. The power tool of claim 11, further comprising a torque clutch for limiting power transmitted from the transmission to the output spindle.
13. The power tool of claim 12, wherein the torque clutch is housed in the gear case.
14. The power tool of claim 13, further comprising a hammer mechanism having first and second hammer cams, the first hammer cam being axially movably mounted in the gear case, the second hammer cam being fixedly coupled to the output spindle.
15. The power tool of claim 14, further comprising a rotary cam housed in the gear case, the rotary cam being configured to coordinate axial movement of the first cam in the gear case.
16. The power tool of claim 13, further comprising a clutch lock-out member that is axially movably mounted to the gear case, the clutch lock-out member being movable in the gear case between a first position, in which the clutch lock-out member does not affect operation of the torque clutch, and a second position in which the clutch lock-out member overrides the torque clutch so that the torque clutch does not limit power transmitted from the transmission to the output spindle.
17. The power tool of claim 16, further comprising a hammer mechanism having first and second hammer cams, the first hammer cam being axially movably mounted in the gear case, the second hammer cam being fixedly coupled to the output spindle.
18. The power tool of claim 17, further comprising a rotary cam housed in the gear case, the rotary cam being configured to coordinate axial movement of the first cam in the gear case.
19. The power tool of claim 11, wherein the transmission is a multi-speed transmission.
20. The power tool of claim 19, wherein the multi-speed transmission is operable in at least three overall gear ratios.
Type: Application
Filed: Feb 25, 2013
Publication Date: Jun 27, 2013
Applicant: BLACK & DECKER INC. (Newark, DE)
Inventor: Black & Decker Inc. (Newark, DE)
Application Number: 13/775,535
International Classification: B23B 45/00 (20060101); B25D 16/00 (20060101); B25F 5/00 (20060101);