Abstract: Interlocking clamps for protective shields currently available generally allow detachment from one side only. An attaching-detaching tool of this invention, by contrast, is structured with a flat edge profile (13) having a thickness less than a spacing between a supporting surface (11) of an interlocking clamp and a frame rail (1) to which the interlocking clamp is mounted. Thus, the tool can be inserted in a gap (15) between the frame rail (1) and the shield (4) and a wrench recess (16) fitted about an angled lug (8) forming a first element (5) of the interlocking clamp on a side facing away from a second clamp element (10). Wedge-shaped jaws (18 and 19), forming outwardly acute angles (17), defining the wrench recess can be pushed between the angled lug (8) of the first clamp element and forked clamping lugs (6 and 7) of a second clamp element (10). The tool allows for easy detaching of a protective shield.

Abstract: A fixed wrench has a handle, and an open end located at one end of the handle and formed of a left jaw and a right jaw. The left jaw and the right jaw are provided respectively with a first actuating surface and a second actuating surface. A first holding portion for holding a first fastening piece is formed by the first actuating surfaces of the left jaw and the right jaw. A second holding portion is formed by the second actuating surfaces of the left jaw and the right jaw for holding a second fastening piece different in size from the first fastening piece.

Abstract: An adapter is provided which makes tightening fittings in miniature fluid flow systems, such as liquid chromatography and flow injection analysis, more precise. Current methods for tightening miniature fittings involve either finger tightening by itself or using a miniature wrench after finger tightening. These methods can lead to wide variations in the amount of torque applied to the fittings, due to differences in the strength and coordination from one person to the next. Over-tightening or undertightening can lead to leaks in these high pressure systems or can result in damage of expensive fluid components such as pumps or valves. The present adapter can be used with any standard torque wrench or torque screwdriver to precisely indicate the amount of torque being applied to these special fittings. Ordinary drive sockets cannot be used with fluid flow systems because the socket interferes with the tubing which protrudes from the fittings being tightened.

Abstract: A wrench for rotating hexagonal fasteners includes an opening defined by a sidewall. The sidewall includes a plurality of contact surfaces for contacting respective sides of the fastener. Each contact surface includes two groups of generally parallel ridges separated by a recessed portion. Each of the ridges has a convexly curved top for contacting a side of the fastener.

Abstract: A wrench is provided including a handle and at least one end extent coupled to an end of the handle. The end extent includes a cut out defining an inner periphery formed of an inboard portion with a smooth substantially arcuate configuration with a predetermined diameter. The inner periphery of the end extent has an engagement outboard portion defined by a pair of linear parallel edges spaced a predetermined distance less than the predetermined diameter.

Abstract: A ratchet wrench having an open end (18) defined by front (20) and rear (22) jaws, in relation to a driving direction. The jaws are linked by an intermediate arcuate web (24). Each jaw includes an engagement surface (30, 36) for engaging the front half of a front surface (32) and a rear surface (38), respectively, of the head of a part to be turned. A projection (42) is provided on the arcuate web for engaging a bearing point (43) on an intermediate head surface (44) located immediately ahead of the rear surface (38) when no torque is applied and over the full range of applied torques. The bearing point (43) of the projection (42) is located in the front half of the intermediate surface (44). The entire arcuate web (24) is spaced apart from the head (28), except at the bearing point (43), when torque is applied as well as when no torque is applied.

Abstract: An open end wrench head is described having four principle internal engaging surfaces arranged about an imaginary central axis with the first and second internal engaging surfaces positioned on a first jaw and the third and fourth internal engaging surfaces positioned on a second opposing jaw. The first and third internal engaging surfaces are substantially flat and parallel to the imaginary central axis. The second internal engaging surface diverges outward from the first internal engaging surface and fourth internal engaging surface diverges outward from the third internal engaging surface.

Abstract: A novel system for visually coding tools as to their size comprises a maximum of two sets of differently colored bands which are placed on the surface of the tool. Each band of each color represents a portion of the size of the tool. Thus, when the number of bands of each color is counted, the size of the tool is indicated. Different colors are used to indicate metric tools versus English tools. Different color schemes may be used to represent the ownership of the tools.

Abstract: A spanner adapted for operative engagement with a hexagonal element, comprising a handle, jaws disposed at one end of the handle, the jaws defining first and second clamping surfaces and a contacting surface, the first clamping surface being continuous on one side of the jaws, the second, opposing clamping surface being disposed on the other side of the jaws, the second clamping surface being interrupted by a recessed portion which separates the second clamping surface into long and short clamping surfaces with the recessed portion being disposed therebetween, the contacting surface connecting the first and second clamping surfaces, whereby when the spanner is rotated in the clockwise direction the jaws engage the hexagonal element and when the spanner is rotated in the opposite direction, a protruding portion of the hexagonal element falls into the recessed portion, permitting the spanner to be repositioned for clockwise rotation.

Abstract: An open end wrench having a mouth defined between two jaws and a nest thereof, and a flat raised portion and a longitudinal series of teeth respectively raised from the two jaws inside the mouth. The longitudinal series of teeth including seven teeth, the center of the raised portion is aligned with the center of the mouth and the middle tooth of the longitudinal series of teeth. The line between the front end of the raised portion and the second tooth of the longitudinal series of teeth is parallel to the line between the rear end of the raised portion and the second to last tooth of the longitudinal series of teeth. The longitudinal length of the longitudinal series of teeth being 0.56 of the width of the mouth, and the distance from the front end of the longitudinal series of teeth to the nest being 0.89 of the width of the mouth.

Abstract: An open end wrench having a mouth defined between two jaws and a nest thereof, a flat raised portion and a longitudinal series of teeth respectively raised from the two jaws inside the mouth. The longitudinal series of teeth including five teeth. The length of the flat raised portion being equal to the distance between the mid point of the first tooth of the longitudinal series of teeth and the midpoint of the last tooth thereof. The total length of the longitudinal series of teeth being equal to 0.67 of the width of the mouth. The distance from the remote end of the longitudinal series of teeth to the nest being 0.91 of the width of the mouth, and the first tooth of the longitudinal series of teeth and the second tooth thereof having a respective smoothly curved peak for grasping normal square head bolts and square nuts and normal hexagon head bolts and hexagon nuts.

Abstract: An engineers wrench has at least one open end forming a mouth which defines a mouth opening. The mouth opening is laterally delimited by a pair of mutually oppositely disposed lateral, surfaces which define a wrench width. At least inwardly disposed sections of the lateral surfaces have a slight convex-cylindrical curvature defined by a finite radius of curvature so that the mouth opening widens in the direction towards respective outer edges to a mouth width which exceeds the wrench width. The mouth opening is inwardly delimited by a mouth base; two substantially flat surfaces are interconnected at the mouth base as well as connected to associated ones of the lateral surfaces through respective connecting surfaces. The connecting surfaces have a concave-cylindrical curvature defined by a smaller radius of curvature than the finite radius of curvature of the convex-cylindrically curved lateral surfaces.

Abstract: A tool for retrieving bathtub drain internal stoppers or plungers, generally known as "buckets", that slide along a tube to open and close the drain. The tool has a handle on one end, a tool head on the other end for engaging a crossbar on the drain bucket and a series of links in between, all connected by universal joints. The head has a hook-like assembly that is slid into a pipe until the head engages the bucket crossbar. The handle is used to alternately rotate the assembly clockwise and counter clockwise to loosen the bucket, then the hook connects to the crossbar to pull the bucket from the pipe.

Abstract: The present invention involves a wrench for tightening and loosening bolts, nuts and fasteners having n number of equal length outside working surfaces. The wrench has a handle and a working wrench head with an orifice which contains at least two pairs of flat inside working surfaces. The pairs of inside working surfaces are arranged about and equidistant from an imaginary central axis through the orifice, and the surfaces of each pair form a surface contact angle a with one another. Additionally, each pair of flat inside working surfaces having a first working surface with a predetermined angle C relative to the imaginary central axis and a second working surface with a predetermined angle D relative to the imaginary central axis, wherein the angle C and the angle D differ from one another, and whereby the first working surface of a given pair of inside working surfaces is non-parallel to the second working surface of an opposing pair of inside working surfaces.

Abstract: A box end of a box end wrench having a substantially .OMEGA.-shaped constraint spring rod mounted therein for stopping the workpiece in the box end, enabling the workpiece to be positively turned with the box end wrench, the constraint spring rod having two opposite ends respectively inserted into two opposite radial through holes on the peripheral wall of the box end, and an arched middle section closely attached to the inside wall of the box end for stopping the workpiece in the box end.

Abstract: A wrench tool includes a member having an engaging opening formed in one end for engaging with fasteners to be driven. The other end of the member includes an orifice parallel to the longitudinal axis and the other orifice perpendicular to the previous orifice, for allowing the orifices to engage with different tool members. The member includes a pair of tapered surface having a number pairs of opposite engaging surfaces for engaging with fasteners of different sizes. A coupler is pivotally coupled to the member and the orifices are formed in the coupler.

Abstract: A set of interlocking wrenches wherein each wrench is configured to engage a second wrench of the set when the two wrenches are placed end to end to extend length and leverage of the first wrench. Each individual wrench has an elongated handle, a box style working head located at one end of the handle, and an open ended working head located at the other end of the handle. A recessed notch or receptacle is formed at the base of the box style working head of each wrench of the set. The notch is configured to cooperate with a jaw of the open ended working head of another wrench of the set, so that two wrenches may be placed end to end and securely engage one another. The notch has surfaces serving as stops maintaining the open ended working head in engagement with the first wrench. The second wrench employed to increase effective length of the first wrench is constrained against slipping out of engagement by the notch when the second wrench is subjected to force increasing torque applied to the first wrench.

Abstract: A device is disclosed for removing a nut frozen is place regardless of the degree to which the corners of the nut have been rounded by a prior attempt to remove such nut by an ordinary wrench. The device is formed with an opening, which is sized to receive the nut and formed with a plurality of teeth preferably arranged such that a leading or cutting edge of each tooth engages approximately with a midpoint of a flat of the nut. The front and rear faces of each tooth form an angle of less than 90.degree. and a gullet between teeth, which is defined by a rear face of one tooth and a front face of a next adjacent tooth, is sized to freely receive the corner(s) between the flats with which the leading edges of an adjacent pair of teeth engage. The gullet is shaped and sized to permit the formation of a chip upon penetration of a leading edge into a flat of a nut, which is operable to lock the nut for rotation with the device.

Abstract: A wrench for a wheel spoke nipple is provided. The wrench includes a body having an axis and first and second axial ends, the first axial end having first and second engagement notches for engaging spoke nipples, and the second axial end having third and fourth engagement notches for engaging spoke nipples. The wrench may also include a central portion disposed between the first and second axial ends, the central portion having first and second radial engaging portions for engagement with a user's fingers or thumb. Each engaging portion having an inner radial end and an outer radial end. Each engaging portion also having first and second oppositely contoured concave faces disposed between the inner and outer radial ends wherein the distance between the first and second oppositely contoured faces of the first engaging portion increases between the inner and outer radial ends.

Abstract: An open-end ratcheting-type wrench for use in driving a hexagonal nut has a handle and a wrench head that is joined to the handle. The wrench head has upper and lower jaws that are rigidly joined together by a web. The jaws have several faces that allow the wrench to be ratcheted about the nut to different drive positions without removing the wrench from the nut. The faces are configured to prevent corner contact with the nut so that the corners are not rounded off. A lock face is provided on the wrench to prevent the removal of the wrench from the nut during use. The lock face has a concave arcuate surface to allow ratcheting.

Abstract: A rigid elongated member with a first end and a second end has a handle disposed at the first end. A substantially straight shank portion protrudes from the handle and can either be notched or smooth. The elongated member extends past the shank to further form an arcuate segment near the second end of the tool. The tool terminates at the second end with a straight segment which is coaxial with the shank.

Abstract: A wrenching member includes at least two spaced-apart and substantially oppositely facing drive surfaces, each of which has a roughened region and an unroughened region thereon, with the roughened region being disposed adjacent to one end of one of the drive surfaces and adjacent to the other end of the other drive surface so as to afford a differential driving arrangement which exerts a greater frictional wrenching force in one direction than in the opposite direction.

Abstract: A tool for removing a vehicle gas tank cap having a cradle for engaging the lug on a conventional gas tank cap. One end of an extension is fixedly connected to the cradle, and a handle is pivotally connected to the other end of the extension. The handle is pivotal from a wholly contained, stored position within the extension member to various angular positions relative to the longitudinal axis of the extension member to accommodate the strength of the particular user. The tool is particularly useful for the elderly and physically handicapped, and it can be folded for storage in the glove compartment or under the front seat of the vehicle.

Abstract: An apparatus and method for tensioning a screen on a roller frame are disclosed. The apparatus includes a fixture having a plurality of clamp mechanisms for releasably securing the frame to define a screen tensioning plane, and at least one double-headed wrench for applying torque to the frame rollers adjacent opposite ends thereof. Each torque wrench includes a lever arm which is operable by torso engagement, thereby freeing a user's hands for manually unlocking and locking a selected roller for rotation.

Abstract: The invention provides an open-ended ratcheting wrench for a hex head fastener. The wrench includes a jaw having an inner surface defining an opening for receiving the fastener. The inner surface includes arcuate heel and nose surfaces that are configured to cause the jaw to ratchet when it is rotated in one direction and that drive the fastener when the jaw is rotated in the opposite direction. The inner surface also includes tapered surfaces that provide undercut areas to protect the corners on the fastener when torque is applied to the fastener. This reduces wear at the corners. The wrench also includes a manually operable handle for rotating the jaw.

Abstract: A slack adjuster check tool includes a holding member formed of flanges to engage a slack adjuster and a retention hook and/or chain to hold the tool in place on a slack adjuster. The retention member is located between the holding member and the handle to allow the user to observe the slack by exerting force on the handle to determine how much freedom of movement there is in the slack adjuster. Openings are provided in the holding member to provide direct access to adjustment heads on slack adjusters.

Abstract: An extensible wrench handle that can be used with a removable wrench head. The wrench handle has a cross beam shaped primary handle over which an extension may be slid to various positions for increasing or decreasing torque. The wrench handle is also provided with a flexible head that is pivotal about a forward end of the primary handle. The flex head has a substantially square drive post which protrudes from a flat surface of the flex head, the edges of the drive post being convex curved surfaces. The wrench head is an open end wrench that has upper and lower jaws that are joined by a web. A neck is joined to the web and has a drive hole which extends through the neck. The drive hole is defined by sidewalls which are convex arcuate surfaces.

Abstract: A manual wrench includes a plate-like member having a plurality of substantially equally spaced projections extending around the periphery of the plate-like member. A slot is formed between two projections. A handle can be friction fitted over one of the radially extending projections for increasing the amount of leverage that can be applied to the wrench.

Abstract: A retrofit assembly for a tool post adapted for rapid attachment and detachment relative to the compound rest of a lathe for adjusting the positioning thereof and for the presentation of a tool holder relative to the tool post consisting of a single operating body for tightening/loosening the tool post relative to the compound responsively to the turning of a stud on a screw means and for tightening/loosening a tool holder relative to the tool post responsively to the driving force of a manipulating device.

Abstract: A speed wrench has a short jaw and a long jaw interconnected by a throat, the jaws respectively having short and long driving surfaces which are generally parallel but which may be very slightly inclined with respect to each other. The throat has a generally flat surface portion adjacent to the short driving surface and inclined at an angle of at least 120.degree. thereto and connected thereto by an arcuate recess in the short jaw. This generally flat surface portion may be slightly convex having a radius greater than twice the distance between the driving surfaces. The remainder of the throat is arcuate and is shaped and dimensioned so that it will not contact a fastener engaged with the driving surfaces. Open-end wrench and adjustable wrench versions are disclosed, and in the former the support surface portion of the throat has a length approximately one-half the side dimension of an associated fastener. In the adjustable wrench version, at least the long driving surface may be serrated.

Abstract: A unidirectional shutoff tool for closing a gas valve, having a valve stem with a rectangular profile extending from the gas valve. The tool has a head and a handle extending from the head to accommodate the application of leverage to the head. A rectangular receptacle is formed in one face of the head and has two diametrically opposed corners for engaging corresponding corners of the valve stem in order for the tool to be used to rotate the gas valve to the closed position. The receptacle is characterized by the absence of corners that could otherwise be used to engage corresponding corners of the valve stem thereby preventing the tool from being used to open the gas valve. The head is angularly offset from the handle to provide an ergonomically acceptable configuration for the tool.

Abstract: An improved ratchet wrench is disclosed that minimizes the number of moving parts that are needed in the device to provide a low torque ratcheting action along with a non-ratcheting high torque mode of operation. Proximate each of the engaging faces of the wrench head, there is an irregular pyramidal cutout. The base of the cutout is a three sided polygon and forms a trailing engagement face when the wrench head is turned in the direction for providing torque to the nut. The apex of this cutout irregular pyramid is contiguous to, and provides a perpendicular junction between, the engaging face and the face of the wrench head. Thus, when the wrench direction is reversed, the wrench head rises up away from engagement with the nut and, upon the cooperating vertices of the nut reaching the next cutout, falls back into engagement with another set of trailing engagement edges. Ratcheting action for low torque applications is thus provided.

Abstract: An open-end wrench is disclosed which can be used with a variety of fastener head shapes and which reduces marring or rounding-off of the corners of the fastener head. The wrench has a wrench cavity for receiving the fastener. The wrench cavity includes offset convex drive surfaces which have a radius of curvature equal to half of the fastener head width. Clearance surfaces are provided adjacent to and in continuously curving contact with the drive surfaces to accept the corners of the fastener head when force is applied to turn the fastener.

Abstract: An extensible wrench handle that can be used with a removable wrench head. The wrench handle has a cross beam shaped primary handle over which an extension may be slid to various positions for increasing or decreasing torque. The wrench handle is also provided with a flexible head that is pivotal about a forward end of the primary handle. The flex head has a substantially square drive post which protrudes from a flat surface of the flex head, the edges of the drive post being convex curved surfaces. The wrench head is an open end wrench that has upper and lower jaws that are joined by a web. A neck is joined to the web and has a drive hole which extends through the neck. The drive hole is defined by sidewalls which are convex arcuate surfaces.

Abstract: A wrench for driving a nut utilizes curved drive faces. The drive faces are convex and protrude inward toward a center line between the jaw portions. Notches are formed on each drive face near the free end. One wrench is adjustable, having a positioner that pushes the nut outward as the movable jaw closes. The positioner maintains the nut in a position in contact with the curved drive surfaces.

Abstract: The alignment of nut and bolt tightening wrenches relative to the nut or bolt is resolved in the instant invention by the placement of a protrusion or protrusions on one face of the wrench head. The protrusion, in the preferred embodiment, extends along an axis 90.degree. of the wrench handle to allow for pivoting of the wrench relative to the plane of the nut or bolt head while in use.

Abstract: A tool which produces a measured torque is coupled to a bolt head or nut, cated in a relatively inaccessible area, by apparatus which includes a wrench member affixed to an adaptor. The wrench member is sized and shaped to engage the fastener to be operated upon and the adaptor has a tubular construction with a tool engaging socket at one end. The adaptor is provided with an elongated slot which accommodates any wires which may pass through the fastener.

Abstract: A wrench for driving a nut utilizes curved drive faces. The drive faces are convex and protrude inward toward a center line between the jaw portions. Notches are formed on each drive face near the free end. One wrench is adjustable, having a positioner that pushes the nut outward as the movable jaw closes. The positioner maintains the nut in a position in contact with the curved drive surfaces.

Abstract: Described is a combination of fasteners and tools which visually communicate their respective sizes to the user so clearly that by merely glancing at these objects a tool matching the fastener or a fastener that matches the tool can readily be selected for use. This beneficial result is achieved by visually coding the fasteners of different sizes either by a pattern or preferably by color so that all fasteners of a given size bear one distinguishing visual appearance, all fasteners of another given size bear another distinguishing visual appearance, and so on.

Abstract: An improved wrench has clamping or gripping jaws at each end of an elongated handle, and is configured as an open-end type, ring or polygonal socket wrench. The clamping jaws are disposed in two separate, non-parallel planes and are extended into the handle, intersecting therein at an angle varying from 90 to 170 degrees, such that handle has a biplanar structure of greatly enhanced strength.

Abstract: The open-end wrenching head includes two jaws and a throat interconnecting the jaws. The jaws include planar jaw driving surfaces each with a roughened region thereon adjacent to the throat and an unroughened region adjacent to the outermost end of the jaw driving surface, each of the roughened and unroughened regions being constructed and arranged to engage a portion of a selected side of a fastener. The throat may include either an arcuate surface or two planar throat driving surfaces. Each of the roughened regions has a coefficient of friction substantially greater than that of the unroughened regions and may be formed by deposition of an abrasive material by any of a number of processes or by deformation of the jaw driving surface by any of a number of processes.

Abstract: A multiple use wrench for use with a hex shaped head with equal hex head sides of a first predetermined length and a square shaped head with equal square head sides of a second predetermined length, where the distance between parallel sides of the hex shaped head is equal to the distance between parallel sides of the square shaped head, including a handle, a drive end attached at one end of the handle, the drive end having a portion suitable for driving the hex shaped and square shaped heads which include seven adjacent sides which are connected in order from a first side to a second side to a third side to a fourth side to a fifth side to a sixth side and to a seventh side, the first side having a length suitable for driving the square shaped head, the second side adjacent to the first side and having a length less than the length of a hex head side, the third side adjacent to the second side, forming an angle of substantially 120.degree.

Abstract: The present invention involves a wrench for tightening and loosening bolts, nuts and fasteners having n number of equal length outside working surfaces. The wrench has a working wrench head with an orifice which contains at least two pairs of flat inside working surfaces. The pairs of inside working surfaces are arranged about and equidistant from an imaginary central axis through the orifice, and the surfaces of each pair form a surface contact angle a with one another. A handle which, is removably or permanently connected to the working wrench head and adapted for rotation of the working wrench head. In one preferred embodiment, the wrench has at least two pairs of surface contact angles that are directly opposite one another.

Abstract: The open-end wrenching head includes two jaws and a throat interconnecting the jaws. The jaws include planar jaw driving surfaces each with at least one serrated region thereon constructed and arranged to engage a portion of a selected side of a fastener. The throat may include either an arcuate surface or two planar throat driving surfaces having serrated regions thereon. Each of the serrated regions on the driving surfaces may include symmetrical or asymmetrical grooves. The plane of these grooves may be parallel to the driving surfaces or at an angle of about 1.degree. to 3.degree..

Abstract: A wrench, such as a socket, for a torquing device, such as a ratchet wrench for cooperating with a fastener, such as a nut or bolt. The fastener has plurality of faces that join each other at respective edges. The fastener also has radii that are measured from the center of the fastener to the respective faces thereof, a first radius from the center of the fastener which is normal to the face of the fastener; a second radius at an angle of approximately 15.degree. from the first radius and a third radius at an angle of approximately 15.degree. plus a flank angle from the first radius. The coupling element includes a plurality of adjoining surfaces. Each surface includes an adjoining flank section at each end thereof that is angled with respect to the surface in a direction away from the corner of the fastener, the angle being the flank angle.

Abstract: A novel combination of two sets of wrenches and sockets, each identifiable for size, with each set calibrated according to a different measuring system and both housed in a common container, and a novel process for identifying said size and said measuring systems by indicia specific to each size and to each system of measurement.

Abstract: The one-piece, open-end wrenching head includes two substantially equal-length jaws with a throat recess therebetween. The jaws respectively include driving surfaces spaced apart a distance slightly greater than the across-flats dimension of an associated hexagonal fastener, with each driving surface having a length no greater than the length of one of the flat sides of the associated fastener and having a serrated region thereon. The distance from the deepest part of the throat to an imaginary line connecting the distal ends of the jaws is approximately 0.86 times the across-flats dimension of the fastener.

Abstract: A wrench having a specific configuration which permits it to be used in tightening a nut which secures a yoke of a yoke/universal joint assembly with the end of a shaft of a drive shaft assembly of a vehicle. The nut is generally seated in a recessed opening in the body of the yoke between a pair of extending trunnions and is secured to a threaded shaft on a stub shaft which extends into an opening in the recess of the yoke. The wrench includes an elongated handle, neck, and a nut engaging head. The neck is provided with specific curvatures which permit the wrench to be inserted into the yoke and a handle having cutout side surfaces which permit the handle to be rotated in a wider arc than could be achieved with a handle having straight sides. The head is provided with an extending portion having an internal nut engaging portion for engaging the nut.

Abstract: An open end wrench for use with a nut allows ratcheting of the wrench without removing the wrench from the nut. The wrench has fixed upper and lower jaw portions. An upper primary drive face and an upper secondary drive surface are located on the upper jaw portions. A lower primary drive face and a lower secondary drive face are located on the lower jaw portions. A rear stop face is located at the junction of the upper and lower jaw portions. Clearances are provided in the upper and lower jaws to enable the wrench to be rotated relative to the nut either approximately 30 degrees from a primary to a secondary drive position, or 60 degrees from primary to primary drive positions.

Abstract: Conventionally, air brake cam clearance is difficult to check due to inaccessibility and the force necessary to rotate the cam to check for the required clearance. The present device engages around the end of the cam lever both front and back and gives sufficient leverage to rotate the cam without any danger of slippage occurring. A wrench is formed on the opposite end of the tool and may be used for adjusting the clearance if necessary.