Abstract: A laser processing device includes: a laser light source; a converging optical system; and a reflective spatial light modulator modulating the laser light such that the laser light is caused to branch into at least first processing light and second processing light, and the first processing light is converged at a first converging point and the second processing light is converged at a second converging point. In a case in which W1 is a radius of the first processing light at a front face of the object, W2 is a radius of the second processing light at the front face, and D is a distance between the first converging point and the second converging point when viewed from a direction orthogonal to the front face, the reflective spatial light modulator modulates the laser light such that D>W1+W2 is satisfied.

Abstract: A laser processing apparatus including a processing nozzle for irradiating a workpiece with laser beam; an actuator for moving the processing nozzle relative to the workpiece; a distance detector for detecting a gap between the processing nozzle and the workpiece; a power abnormality detecting section for detecting an abnormality in electric power supplied from a power supply unit; a gap control section for controlling the actuator based on a detected value obtained by the distance detector, so as to perform a gap control for adjusting the gap to a target value, during execution of laser processing; and a change control section for maintaining the gap control in an enabled state until a power abnormality is detected by the power abnormality detecting section during execution of laser processing, and for disabling the gap control when a power abnormality is detected by the power abnormality detecting section during execution of laser processing.

Abstract: A material deposition head may include a body that defines first and second ends, an exterior surface, an interior surface, and one or more material delivery channels, where the exterior surface includes fluting. In some examples, a system may include a fluted material deposition head, a fluidized powder source, and an energy source.

Abstract: A coaxial nozzle of a laser beam machine has an inner nozzle in which a laser beam and an inner gas are passing through an inner side, an outer nozzle provided at an outer side of the inner nozzle, and a cooling circuit for cooling the inner nozzle.

Abstract: An additive manufacturing apparatus includes: a coater including: at least one trough including a plurality of side-by-side deposition valves.

Abstract: A method is provided for reworking a component. The method includes at least partially filling a cavity in a non-fusion weldable base alloy with a multiple of layers of a multiple of laser powder deposition spots formed of a filler alloy. Each of the multiple of laser powder deposition spots at least partially overlaps at least one of another of the multiple of laser powder deposition spots. The filler alloy may be different than the non-fusion weldable base alloy.

Abstract: Embodiments are directed to laser-based processes for forming features on the surface of a part. The feature may include a geometric element, a color element, and/or a surface finish element. In some cases, the laser-formed features are formed as a pattern of textured features that produce an aesthetic and/or tactile effect on the surface of the part. In some cases, the texture features may be sufficiently small that they may not be discerned by the unaided human eye. Also, in some cases, a multiple laser-based processes are combined to form a single feature or a finished part having a specific aesthetic and/or tactile effect.

Abstract: A piercing processing method and a laser processing machine capable of carrying out a piercing processing on a thick plate in short time are provided. It is a processing method for carrying out a piercing processing on a metallic material by laser beams with wavelengths in 1 ?m band, where the piercing processing is carried out by maintaining a range of 8?Zr/d?12 when a condensed beam diameter of the laser beams is set to be d and a Rayleigh length of the laser beams is set to be Zr. At that time, a focal position of the laser beams is set to be on a surface of a workpiece or an external of the workpiece. Then, a beam profile of the laser beams is such that the laser beams of a single mode are converted into a bowler hat shape by a beam quality tunable device.

Abstract: Employing laser scanning directions (20) that are oblique to and against a predominant gas flow direction (25) equalize the quality and waviness characteristics of orthogonal scribe lines (26) made by the laser scans. Positioning and sequence of multiple scan passes to form a feature wider than the width of a scribe line (26) can be controlled to enhance quality and waviness characteristics of the edges of the feature.

Abstract: Systems and methods according to one or more embodiments are provided for a flexible and local laser shroud that conforms to a contoured work surface and confines laser light energy from a laser end effector to the work surface. In one example, a system includes a laser end effector coupled to a robotic arm to provide laser light energy to a work surface. The system also includes a shroud coupled to the end of the robotic arm and extending to the work surface. The system further includes, as part of the shroud, a flexible laser light seal to conform to the work surface to substantially prevent the laser light energy from passing between the shroud and the work surface as the laser end effector travels along the work surface.

Abstract: A rotary device, comprises a central hub; and at least one blade extending from the hub; wherein the blade comprises a blade body and a blade cap, the blade body having a blade body tip, the blade cap being arranged to cover the blade body tip; and wherein the blade cap comprises a mesh.

Abstract: In one aspect, a method includes conducting a plurality of tests on process variables of a thermal process, with a test of the plurality of tests being conducted on two or more process variables, the test comprising: locally heating a region of a structure, wherein the local heating results in formation of a thermal field in the structure; assessing one or more temperature integrals of the thermal field; and based on results of the plurality of tests, generating a process map of the one or more temperature integrals of the thermal field, with the one or more temperature integrals based on a function of the two or more process variables.

Abstract: A braided solder wire rope includes a first alloy including Bi—Ag, Bi—Cu, Bi—Ag—Cu, or Bi—Sb; and the second alloy including Sn, In Sn—Ag, Sn—Cu, Sn—Ag—Cu, Sn—Zn, Bi—Sn, Sn—In, Sn—Sb or Bi—In, such that the second alloy controls an interface reaction chemistry with various metallization surface finish materials without interfering with a high temperature performance of the first alloy. The first alloy may have a solidus temperature around 258° C. and at least the first alloy of the first wire and the second alloy of the second wire may be braided together.

Abstract: A bonding material of a silver paste includes: fine silver particles having an average primary particle diameter of 1 to 50 nanometers, each of the fine silver particles being coated with an organic compound having a carbon number of not greater than 8, such as hexanoic acid; silver particles having an average primary particle diameter of 0.5 to 4 micrometers, each of the silver particles being coated with an organic compound, such as oleic acid; a solvent containing 3 to 7% by weight of an alcohol and 0.3 to 1% by weight of a triol; a dispersant containing 0.5 to 2% by weight of an acid dispersant and 0.01 to 0.1% by weight of phosphate ester dispersant; and 0.01 to 0.

Abstract: A self-heating solder flux material includes a solder flux material and a multi-compartment microcapsule. The solder flux material includes a solvent carrier, and the multi-compartment microcapsule includes a first compartment, a second compartment, and an isolating structure. The first compartment contains a first reactant, and the second compartment contains a second reactant. The isolating structure separates the first compartment from the second compartment. The isolating structure is adapted to rupture in response to a stimulus. Rupture of the isolating structure results in an exothermic reaction between the first reactant and the second reactant. The exothermic reaction generates heat to volatilize the solvent carrier.

Abstract: A rotary cutting tool with an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline-diamond cutting tip. The cutting tip comprises an inner portion having an inner point angle and an outer portion having an outer point angle different from the inner point angle.

Abstract: A device for supporting and/or guiding a first structure that includes machines, instruments and/or structures in general, particularly for supporting and/or guiding a telescope, relative to a second structure, includes a sliding system with a slide block adapted to slide relative to the second or the first structure; for a fluid, a chamber that is separate from and independent of the sliding system and that includes a first portion fixed to the sliding system and a second portion adapted to be associated with the first or the second structure; a fluid circuit that is also separate from and independent of the sliding system and that communicates with the chamber to control the passage of the fluid into and from the chamber; and an elastic member housed in the chamber to absorb the oscillations between the first and the second portion.

Abstract: Present invention relates to a rotary positioner that allows a welding table's work surface to be set at an angle as desired by a user. Two vertical frames can move and slide along the length of a chassis-bar to adjust the distance between the two vertical frames. As long as the length of a welding table does not exceed the total greatest distance between the two vertical frames, the present invention can fit any work table or welding table. Caster wheels and height adjustment knobs allow for easy movement and balancing of the rotary positioner.

Abstract: An assistive device for heavy tool operation includes a rectangular frame and four legs extending from the corners of the frame. A tool base can extend through a slot in the frame. The tool base is configured to support a mechanical support arm and tool. A height and horizontal position of the tool base relative to the frame is adjustable. Each leg is connected to a wheel to allow the assistive device to travel with a user. The assistive device can support a majority, if not all, of the weight of an attached heavy tool and mechanical support arm, while allowing the user to operate the tool and adjust its position with minimal applied force.

Abstract: A speed change auxiliary device of a lathe is provided. A side chamber of the lathe is provided with a shaft seat and a bottom shaft seat at the top and bottom thereof. An auxiliary device is provided between the shaft seat and the bottom shaft seat. The auxiliary device includes a shaft. A spring, an eccentric block, an engaging member, a positioning nut, a rotary sleeve and a fixing block are fitted on the shaft. The rotary sleeve includes a handle. Two sides of an inner circumferential surface of the rotary sleeve have protrusions. The protrusions each have an upright surface and an upper guide bevel at two sides thereof. The fixing block is disposed on the bottom shaft seat. Two sides of a circumferential surface of the fixing block have recesses. The recesses each have a stop surface and a lower guide bevel at two sides thereof.

Abstract: An accessory (100, 200, 600, 700) for an electric drill (112, 612) is disclosed as including a dust box (118, 218, 618, 702) for receiving abraded materials produced by an electric drill on a workpiece, the dust box including an internal cavity, a first longitudinal end (116, 216, 616) with a first opening (130a, 632a) communicating with the internal cavity, an opposite second longitudinal end with a second opening (120a, 618a) communicating with the internal cavity, and a brush (128) or a disc (628), and when a drill bit (114, 614) of the electric drill is received into the internal cavity of the dust box through the second opening, the brush or disc is releasably engageable with the drill bit for simultaneous rotational movement about a longitudinal axis of the drill bit.

Abstract: A tool path-generating device for generating a tool path for moving a tool and a workpiece relative to each other and processing said workpiece is equipped with: an opposite path-extracting section for extracting two tool paths, the movement directions of which are roughly opposite to each other; a reversal position-calculating section for calculating a reversal position at which the tool feed direction is reversed at a position, between the endpoint of one of the two tool paths and the starting point of the other of the two tool paths, that is separated from the workpiece; and a reversal path-generating section for calculating a connecting path that passes through the endpoint of one of the two tool paths, the reversal position, and the starting point of the other of the two tool paths.

Abstract: A machine tool which removal-machines a workpiece by means of a tool includes a retaining device (a workpiece spindle and a tailstock) that retains the workpiece, a support device (an in-machine robot) that supports the workpiece, in order to suppress deflection of the workpiece retained by the retaining device, and a control device that controls driving of the support device by force control having a force as a control target. Specifically, a supporting force by the support device and a machining force by a tool are measured, and the driving of the support device is controlled so that the supporting force is equal to the machining force.

Abstract: In a scroll machining method, a scroll has a disc-like end plate and a scroll wall extending from a first side surface of the disc-like end plate, and the scroll is driven to rotate around a center axis C of the scroll, and a first cutter machines a side wall surface of the scroll wall while the scroll is rotating. The first cutter is a non-rotary cutter. When the scroll is machined, the scroll rotates around its center axis, and the first cutter does not rotate around its axis, thereby improving the scroll's machining precision and machining efficiency.

Abstract: An attachment for a sanding tool includes a first portion and a second portion. The first portion has a generally tubular shape that defines a mounting end portion for mounting the attachment on the sanding tool. The second portion defines a distal end portion of the attachment and a plurality of slits. The slits extend along an axial direction of the attachment to divide the second portion into flaps configured to axially flex and define a contoured sanding surface along the axial direction.

Abstract: There is disclosed a polishing cleaning mechanism configured to be in contact with a rear surface of a substrate which is held in a substrate holding unit for holding the rear surface of the substrate and perform a polishing process and a cleaning process on the rear surface of the substrate, including a cleaning member configured to clean the rear surface of the substrate, a polishing member configured to polish the rear surface of the substrate, and a support member configured to support the polishing member and the cleaning member to face the rear surface of the substrate held in the substrate holding unit, wherein a surface of the polishing member facing the substrate and a surface of the cleaning member facing the substrate differ in relative height from each other.

Abstract: A grinding apparatus includes a chuck table for holding a wafer having a modified layer near the front side or a groove on the front side, the groove having a depth not less than a finished thickness of the wafer, a grinding unit for grinding the back side of the wafer to divide the wafer into a plurality of chips, a die strength measuring unit for measuring the die strength of any one of the chips, and a control unit for controlling each component according to a measured value of die strength. The control unit determines that grinding is not to be performed on the remaining wafers stored in the cassette when the measured value is less than a threshold value, and determines that grinding is to be performed on the remaining wafers when the measured value is greater than or equal to the threshold value.

Abstract: Disclosed is a polishing-layer molded body including: a thermoplastic polyurethane that is a polymer of a monomer including: a polymer diol; an organic diisocyanate; a first chain extender including a diol having 4 or less carbon atoms; a second chain extender including a diol having 5 or more carbon atoms, a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate being 6.3 to 7.4 mass %, and the polishing-layer molded body being non-porous.

Abstract: A polishing head includes a carrier head and a plurality of pressure units arranged on the carrier head. At least two of the pressure units are located on the same circumferential line relative to a center axis of the carrier head.

Abstract: A method of forming a super hard PCD construction comprises forming an aggregated mass comprising a catalyst/solvent material for diamond, and one or more of W, Mo, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, forming a pre-sinter assembly comprising the aggregated mass and a plurality of diamond grains and treating the pre-sinter assembly at UHPT to form a PCD construction. Residual catalyst/solvent and one or more of W, Mo, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, in non-carbide form at least partially fill a plurality of interstitial regions in the PCD. There is also disclosed a superhard PCD construction comprising a body of PCD material formed of a mass of diamond grains and a non-superhard phase at least partially filling a plurality of interstitial regions, wherein the non-superhard phase comprises one or more of W, Mo, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, in the non-carbide form.

Abstract: A clamping device has a rotatably mounted clamping shaft (2), a clamping element (1), and a control mechanism (3). The clamping shaft (2) is formed from an inner shaft (2.1) and an outer shaft (2.2) that receives the inner shaft (2.1). The outer shaft is connected to the control mechanism (3) to pivot the clamping shaft (2), via a lever arm (5). The inner shaft (2.1) is rotationally connected conjointly to the clamping element (1). The inner shaft (2.1) is fixed in position relative to the outer shaft (2.2) by an adjustment element (4) connected to the inner shaft (2.1).

Abstract: Embodiments are directed to a wood clamp that grips two perpendicularly arranged boards. A pair of gripping elements having planar surfaces may define a gripping jaw that is moveable to grip a first board A lateral support member may extend from a spacer orthogonally from a longitudinal direction of the pair of gripping elements and may define a projection. The projection may be configured to prevent sliding of a second board supported by the lateral support member and abutting the first board. A lockable handle assembly coupled with the pair of gripping elements may be configured to manipulate an offset between the pair of gripping elements by moving at least one of the pair of gripping elements and locking a position of the planar surfaces to maintain the offset using a linkage.

Abstract: An adjustable open ended wrench having adjustable gripping jaws that grip inch or metric sized nuts or bolts and provides bidirectional release action of the gripping jaws that allows the user to loosen or tighten the nut or bolt without having to remove the wrench. The wrench is particularly suited for accessing nuts or bolts or nuts that are located in areas where rotational action is very restricted and may be provided with an adjustable torque release spring biased ball detent mechanism that can be set to release the grip of the gripping jaws if the gripping force exceeds a predetermined amount to prevent damage to the nut or bolt due to over tightening.

Abstract: A cleanable reversible socket and driver for a hex head fastener having a driver shank with a hex shaped shaft, or otherwise splined, having a tool mounting end and a socket mounting end and a collar therebetween. A cleanable reversible socket is provided having a hex, or otherwise splined, passage therethrough rotationally lockable with the similarly shaped driver shank shaft. The socket is removably, nonrotatably mountable onto the driver shank shaft at the socket mounting end up to the collar having two different sized hex socket ends. A magnet on the socket mounting end of the driver shank is to be located at a bottom of one of the two hex socket ends when the socket is mounted on the driver shank to hold the hex head fastener in one of the socket ends.

Abstract: The invention relates to a device for driving a securing element into a substrate, having a mechanical energy store for storing mechanical energy; an energy transmitting element for transmitting energy from the mechanical energy store to the securing element; an energy transmitting device for transmitting energy from an energy source to the mechanical energy store; a housing with a first and a second housing part, said first housing part being connected to the second housing part in order to form an interior between the first and second housing part, the mechanical energy store being arranged in said interior; and an intermediate element, by means of which the mechanical energy store can be secured to the first housing part at least temporarily while energy is stored in the mechanical energy store.

Abstract: A nail plate tool which aids in positioning and installing nail plates in hard-to-reach areas. The nail plate tool generally includes an elongated portion having a handle portion at its first end and a holder portion at its second end. The handle portion is adapted to be grasped by a user and the holder portion is adapted to removably retain a nail plate against the nail plate tool, such as through use of a magnet. By removably securing the nail plate to the holder portion, an individual may more easily reach areas to install a nail plate.

Abstract: The present invention includes devices and methods that assist in hanging pictures or other things in a desired position on a wall or other similar surface where it is desired to insert two or more mounting nails. Embodiments of the invention include a pair of punch assemblies for inserting the nails provided on a pair of parallel stabilizing bars, although other embodiments may include more than two punch assemblies. Preferred embodiments also include a measuring strip (ruler) between the punch assemblies, and a slidable level and/or a laser. The unique nail insertion mechanism includes a sleeve for receiving a finishing nail, a magnet for holding the nail in place, and a coil spring for maintaining the handle in striking position. After positioning the device on a wall, applying force to each handle collapses the spring and causes a nail to be driven into the wall.

Abstract: A drill includes a housing and a motor having a drive spindle. An output spindle is capable of being rotationally driven by the drive spindle via a torque clutch. The drill further includes atangential impact mechanism for superimposing tangential impacts onto the output spindle when activated. The tangential impact mechanism includes a sleeve rotatably mounted on the output spindle, and an anvil rotatably mounted onto the output spindle. The output spindle and the sleeve are rotationally driven by a planetary gear system comprising a ring gear, a sun gear and a planetary gear which is drivingly connected between the ring gear and sun gear.

Abstract: A drill includes a housing and a motor having a drive spindle. An output spindle is capable of being rotationally driven by the drive spindle via a torque clutch. The drill further includes a tangential impact mechanism for superimposing tangential impacts onto the output spindle when activated. The tangential impact mechanism includes a sleeve rotatably mounted on the output spindle, and an anvil rotatably mounted onto the output spindle. The sleeve is rotationally driven by the drive spindle via a gear system at a first rotational rate when the torque clutch is not slipping and at a second rotational rate when the torque clutch is slipping.

Abstract: The present invention provides a multi-mode drive mechanism. The multi-mode drive mechanism may be employed, for example, in a power tool, for driving a chuck supporting an end effector, such as a drill bit or spiral cut bit, for acting on a work surface. For example, when employed in a power tool, the mechanism can generate rotating, reciprocating, or simultaneous rotating and reciprocating motion. Cutting with simultaneous rotational and reciprocating motion lessens the potential for undesired walking or wandering of the cutting bit by actively removing debris from the cut. Additionally, multi-mode drive mechanisms provide increased functionality in a single tool to accommodate a variety of situations and materials. One aspect of the invention provides a multi-mode drive mechanism including: an input shaft, a reciprocating assembly, an output shaft, a reciprocating block, and a shift collar. The input shaft terminates in an input external spur gear.

Abstract: A companion multi-tool that includes an elongated body, a blade sharpening cavity, a sharpening element, a tinder material, a flint material, a noise generating material and a clip. The elongated body has a first end and a second end. The blade sharpening cavity is formed in the elongated body proximate the first end thereof. The sharpening element is attached to the elongated body in the blade sharpening cavity. The tinder material is attached to the elongated body. The flint material is attached to the elongated body. The noise generating device is formed in the elongated body proximate the second end thereof. The clip is attached to the elongated body intermediate the first and second ends.

Abstract: A handheld kitchen appliance assembly including a drive unit having a housing, a rechargeable battery disposed within the housing, and a motor disposed within the housing and powered by the battery. The handheld appliance assembly also includes a tool having an attachment portion for releasably connecting the tool to the drive unit. The tool is selectively driven by the drive unit when the tool is connected to the drive unit. A charging unit includes a cavity sized and shaped to receive a portion of the drive unit. The charging unit includes a power supply and is configured to send a charging current to the battery of the drive unit to recharge the battery when the drive unit is received within the cavity. A cradle includes an opening sized and shaped to support the tool when the tool is disconnected from the drive unit. The cradle includes a linkage that is engagable with the charging unit for selectively connecting the cradle to the charging unit.

Abstract: A motor control unit (6) is adapted for controlling an electronically driven hand held and/or hand guided tool (1) featuring a housing (2) and a working element (3) located outside the housing (2), the housing (2) containing an electric motor (29) and a gear mechanism for translating a rotational movement of the motor (29) into an actuation movement of the working element (3). An electrically driven tool (1) is also provided that includes such a control unit (6). In order to reduce tool costs, the control unit (6) is embodied separately from the tool's housing (2). The control unit (6) includes a technique (9; 16) for mechanically attaching the control unit (6) to the housing (2) and a further technique (18; 23, 24) for electrically connecting the control unit (6) to electronic components (19; 29, 31, 32) of the tool (1) for operation of the tool (1).

Abstract: Mechanisms for reducing power output of a power tool by restricting airflow into the motor of the tool. The power regulator can be implemented in only one of the rotational directions, for example, the forward (or clockwise) direction, and can be independent of the forward/reverse mechanism to avoid a user becoming confused as to the source of tactile feedback. By limiting air input to the motor, rather than bleeding out motor output, the mechanisms prevent wasted power output. Also, the power regulation mechanism can be located near the motor to more effectively restrict airflow.

Abstract: A portable power tool is disclosed. The tool has a tool holder, a motor, a switchable gear stage, and a slider. The gear stage has a gear element movable in a switching direction with a toothing, which in a first gear position is engaged with a corresponding toothing and in a second gear position is disengaged. The slider is displaceable between first and second switch positions where the first switch position is allocated to the first gear position and the second switch position is allocated to the second gear position. A coupling device has a carriage movable in the switching direction and a catch. The carriage is connected to the gear element and the catch is latched in the first and second gear positions. A spring element has springy first and second sections. The slider has a finger that is arranged along the switching axis between the sections.

Abstract: A brushless DC (BLDC) motor is provided including a stator assembly and a rotor rotatably arranged inside the stator. The stator assembly includes a generally-cylindrical lamination stack including a stator ring and stator teeth extending radially inwardly from the stator ring towards a center bore, where the center bore is arranged to receive the rotor therein. The stator assembly further includes an end insulator disposed at an and of the lamination stack, where the end insulator includes a generally-cylindrical outer ring and teeth portions extending radially inwardly from the outer ring towards a center of the end insulator, and the outer ring and the teeth portion correspond to the stator ring and the stator teeth. Stator windings are wound around the stator teeth and the corresponding teeth portion of the end insulator.

Abstract: A power tool motor is provided including a stator assembly and a rotor assembly rotatably disposed within the stator assembly. The stator assembly includes: a generally-cylindrical lamination stack having a stator ring and stator teeth extending radially inwardly towards a center bore arranged to receive the rotor assembly therein; an end insulator disposed at an and of the lamination stack and having an outer ring and teeth portions extending radially inwardly from the outer ring towards a center of the end insulator; and stator windings wound around the stator teeth and the teeth portion of the end insulator. A generally cylindrical seal member is disposed to interface with an end of the stator, which includes a mating surface having indents configured to mate with ends of the stator windings or ends of the teeth portion of the end insulator to substantially seal respective gaps therebetween from entry of workpiece particulate.

Abstract: The telescoping back tool kit is a multipurpose tool. The telescoping back tool kit comprises a base apparatus, a plurality of heads, and a threaded connection. The threaded connection removably attaches a head selected from the plurality of heads to the base apparatus. The head forms the working element of the telescoping back tool kit. The purpose of the telescoping back tool kit is changed by interchanging two heads selected from the plurality of heads. The base apparatus is a mechanical structure used to adjust the span of the distance between a user of the telescoping back tool kit and head selected from the plurality of heads.

Abstract: A configurable handgrip has a plurality of plates, the plates being arranged in a stack, a clamp element operably engaging the stack, and the clamp element being operable to transition between a first released position in which the plates are free to move with respect to each other, and a second clamped position in which the plates are secured against movement with respect to each other, such that the stack may be formed into a selected shape when the clamp is in the released position, and the plates are held in the selected shape when the clamp is in the clamped position. Each plate may define a plate aperture. The clamp element may be an elongated member received in the plate apertures. The plates may each have a contact edge and an opposed recessed edge.

Abstract: A creeper has a frame with a first end and a second end; a body cushion mounted at the first end; a head cushion mounted at the second end, and hingedly connected to the frame; and a plurality of wheel assemblies rotatably mounted to the frame. Each wheel assembly includes a wheel with an attachment member; a bracket having a first opening and a second opening; and first and second fasteners. The first opening in the bracket corresponds to a first opening in the frame, and the first fastener passes through the respective first openings. The second opening in the bracket corresponds to one of a second opening and a third opening in the frame, and the second fastener passes through the second opening of the bracket and one of the second or third openings to rotate the bracket between an operation and a storage position, respectively.