Abstract: A knock-down fitting to hold together two panels at right-angles to one another comprises a body having projections extending from one side and a peg which is received in a bore in the body. One end of the peg and each projection of the body has barb formations to engage holes pre-drilled in the panels.In accordance with the invention the other end of the peg received in the bore is toggle-shaped and has a waist engaged on opposite sides by the arms of a bifurcated clip. By acting on the cam surface provided by the waist the clip draws the peg into the bore in the body but the toggle shape of the inner end of the peg allows a degree of lateral tolerance to compensate for minor inaccuracies in the positioning of the holes in the panels.

Abstract: A valve which can be applied to a water pipe while the pipe remains in service. The body of the valve is formed in two sections which can be applied to the outside surface of the water pipe and secured together in precise alignment with one another by tapered pins. A reciprocating gate which forms the valve element is bifurcated and includes a pair of gate sections carrying knife edges which cut through the pipe wall when the gate is initially moved to its closed position. This cuts away a ring from the water pipe and permits the gate to function to control water flow through the valve. The scrap ring which is cut away from the pipe is forced by the gate into a cavity disposed out of the flow line. The gate crushes the ring against a complemental convex surface of the cavity. Camming interaction between the leading ends of the gate sections and the convex surface mechanically forces the gate sections away from one another to press them firmly against the valve seats when the gate is fully closed.

Abstract: A flexible retainer for coupling an inner polygonal stud and an outer tubular member includes an elongated arm from which a pair of spaced fingers transversely extend. The outer tubular member includes a polygonal bore into which the inner stud is inserted in a telescoping manner. The inner stud includes a transverse hole which when aligned with diametrically positioned lateral apertures in the outer tubular member forms a generally transverse channel in the telescoping member combination. With the arm of the retainer positioned around a portion of the periphery of the outer tubular member, each of the fingers positioned thereon may be inserted within a respective lateral aperture of the outer tubular member so as to extend into the transverse hole of the stud in securely coupling the two telescoping members.

Abstract: A lock pin assembly for a collar bracket which is capable of engaging and releasing a member to be fixed. The lock pin is generally of cylindrical shape having, at one end, a neck portion of a small diameter, a pair of parallel excisions adjacent to the neck portion, the boundary between the neck portion and the excisions forming a shoulder, and, at the opposite end, a tapered tip. The collar bracket is provided with a pair of outwardly extending flanges, each having a hole for housing a pair of respective lock pins in opposite orientation. The lock pins are freely rotatable in the flange holes and are biased rearward by springs. A plate with a U-shaped cut-out is provided adjacent each flange for engaging the shoulder of each respective lock pin when the lock pin is moved forward against its bias and then rotated. When the lock pin is moved inward and rotated to such position, its tapered tip engages the member to be fixed.

Abstract: A coupling assembly particularly for a trailer hitch or similar device, wherein a coupling hook is to be engaged about a coupling sphere including an annular retainer plate having a radially innermost conical support region and a radially outermost conical guide region formed integrally with each other opening away from said coupling sphere with the support region having an opening angle of about 156.degree. and the conical guide region having an opening angle of less than 120.degree., the support region extending radially through about one-third of the total radial width of the annular retainer plate.

Abstract: A connecting assembly comprising a support including spaced-apart sides, and a bore extending between the sides, a first member slideable in the bore, and including a first portion located on one side of the support, and a second member including an opening therein. The connecting assembly also includes a connecting device adjacent to one side of the support for connecting the second member to the first portion of the first member and comprising a first piece fixedly connected to the first portion, and a second piece located between the first piece and the one side of the support. The second piece also includes a bore which receives the first member for movement thereof relative to the second piece between a connect position with the first piece adjacent the second piece and a disconnect position with the first piece spaced from the second piece.

Abstract: A fluid pressure actuated piston (78) is slidably carried in a fluid pressure actuated cylinder (50) which, in turn, is slidably carried in a fixed carrier or casing (21). Movement of the cylinder (50) is resisted by a breakable or displaceable coupler (90, 94, 184, 185) which engages the cylinder (50). Fluid pressure acting upon the cylinder (50) and piston (78) causes the coupler (90, 94, 184, 185) to break or be displaced and release the cylinder (50) for axial movement in the direction of movement of the pressure responsive piston (78).

Abstract: There is disclosed a retaining ring for sockets which are attached to the shaft of a power driver, such as the pneumatic air tools, which is a molded elastomer ring with a diametric, integrally molded pin with a metal sleeve surrounding a portion of the pin. The sockets are provided with a receptacle which receives the shaft end of the driver and flats are provided on the shaft and receptacle to transmit torque. A transverse bore is provided in the shaft end and this receives the pin of the retaining ring. The specific improvement of this invention is a metal sleeve about the portion of the pin which extends across a boundry interface between the shaft end of the driver and the inside wall of the socket member to provide reinforcement to the pin, resisting shearing and abrasive wear.

Abstract: An assembly for allowing quick removal of a wheel from a vehicle is provided. The original wheel axle is replaced with an elongated axle which is adapted to extend through a block clamped to the vehicle frame. The block includes a spring-biased plunger which interfits with an annular groove at the end of the axle to lock the wheel and axle in place. The plunger is withdrawn from the groove to release the axle and allow one to readily remove the wheel.Alternately, an indented shaft fits within the groove to lock the axle. Upon rotation of the shaft to align the indentation over the groove, the axle may be released and withdrawn from the block.

Abstract: Apparatus for installing anchors in the earth using rotational power and axial thrust from a power source includes an elongated torque tube for enclosing a guy rod of an anchor and having a lower end portion adapted to drivingly engage the hub of the anchor. A drive coupling is provided for detachably interconnecting the power source to drive the torque tube and install the anchor, and the coupling includes a body having a socket for receiving an upper end portion of the torque tube and an upper end portion of the guy rod. The socket has flatted side walls formed with radial ports which are positioned to face apertures that are provided in a torque tube which has been inserted into the socket. Lock pins are slidably mounted in the radial ports and are biased toward the center of the socket. The lock pins are adapted to project into the apertures of a torque tube when fully seated in the socket and also engage and hold the guy rod of an anchor as it is driven into the earth.

Abstract: A tapered pin-key for securing a part and a shaft where the part has a cylindrical bore for receiving the shaft and a keyway tangentially intersecting the bore, and the shaft has a tangential groove shallower than the depth of the intersection of the keyway and the bore. The pin-key comprises two cylindrical surfaces converging at a small angle. The radius of the two cylindrical surfaces, the keyway, and the groove in the shaft, are all equal. The pin-key is placed in the keyway with one face engaging the surface of the keyway and the second face engaging the surface of the groove in the shaft, thereby securing the part and the shaft against relative rotational or axial movement.

Abstract: In an exploration type drill rig, an improved assembly arrangement for a soil sampling tube and head support therefor including nesting, aperture-aligned tubular wall sections of the sampling tube and head support with a pin extending through aligned apertures and held in position by a spaced stop and movable detent extending radially from the pin on opposite sides of the nesting tubular walls.

Abstract: Apparatus for rigidly coupling a first member to a second member along a longitudinal axis is disclosed wherein one of the members carries a pair of wedges coupled to opposite threaded ends of a differential screw. The other one of the two members includes a reaction surface confronting wedging surfaces on each of the two wedges. Upon rotation of the differential screw, the wedges are moved in opposite directions to bear against the reaction surface with substantially a surface area contact to force the first and second member into rigidly coupled engagement. Upon rotation of the differential screw in an opposite direction, the wedges are positively moved in reverse opposite directions to effect uncoupling.

Abstract: A positioning collar clamping device comprising, a generally rectangular body member having a projecting portion, said member being adapted to receive a shaft through a central longitudinal opening therein, means defining a first transverse opening through said member and overlappingly intersecting with said shaft receiving longitudinal opening, a lock pin adapted to movably fit within said first transverse opening having first and second ends, said first end having a threaded surface and said second end being adapted to affect an interference fit with said shaft disposed within said longitudinal opening when said lock pin is moved in a first direction, while moving said pin in a second direction reduces and eliminates the interference fit, means defining a slot at one end of said first transverse opening, and captive nut means threadably receptive of said first end of said lock pin, said captive nut means being positioned in said slot so as to be axially immovable in relation to said first transverse opening

Abstract: A carriage for suspending a load such as a compartment of a vehicle or the like, is basically comprised of a pin, rod or bar from which the load is centrally suspended and which by and in itself is suspended by two wheel carriers, each supporting a wheel for running on opposite flanges of a rail; each wheel carrier has a clamping bore intersecting the bore receiving the load carrying rod and a tension pin-with-wedge is inserted in an intersecting bore for clampingly engaging the load bearing rod upon tightening of a nut on an external thread of the respective tension pin; loosening of the nuts releases a contour fitting engagement and permits the wheel carrier to be adjusted into any desired position on the load carrying rod; the wedges may be constructed as cutting edges for cutting into the load carrying rod upon tightening.

Abstract: A connecting-rod system for mowers in particular, wherein, for actuating elements driven by alternate motion, there are used rods mounted on a crank which can be linked to the drive shaft by fitting a crank pin into a seat in the shaft itself. On the crank pin there is at least one flat wall intended for properly positioning the crank pin itself by interacting with a corresponding flat wall provided in said seat.

Abstract: An excavating tooth has a blade of substantially constant thickness with a transverse shoulder at its inner end and a longitudinal gusset. The tooth terminates in a reduced diameter spindle and a button with a shoulder on its forward face. The adapter has a recess to receive the tooth, the forward end of the adapter receiving the thrust of the tooth because the transverse shoulder bears thereagainst. A top to bottom opening in the adapter intersects the recess at the spindle. A pair of grooves are formed on the outside edges of the opening with projections extending inward from the outer walls of the grooves. A retainer is formed of round cross-section wire and slides in the grooves between locked and unlocked positions, the diameter of the wire being less than the width of the grooves. The retainer is symmetrical about its longitudinal center line, having a slightly upward bowed top connector and legs depending from either end of the connector.

Abstract: An adjustable steering assembly for vehicles pivotable forwardly and rearwardly about upper and lower pivots, the upper pivot being operably connected to the steering column by a swingable link which is adapted to actuate along said steering column an axially slidable adjustment sleeve assembly. The sleeve assembly includes a manually adjustable spring actuator for adjusting axially of the steering column the position of a detent device which in turn allows angular adjustment of the steering column for the comfort of operators of different sizes and heights and to provide a fully forward tilted position at which improved access to vehicle components is provided.

Abstract: A mortice and tenon joint of two structural members which avoids the protrusion of the tenon beyond the mortice. Across the tenon (11) of one member (10) there is cut a dovetail aperture or slot (12), and a movable tapering wedge (16) of similar dovetail cross-section is slidably housed within a tapering channel also of similar dovetail cross-section which crosses the mortice (14) of the other member (13) such that when the tenon (11) is inserted wholly into the mortice (14) the wedge (16) may be driven along the tapered channel to become firmly engaged within the dovetail aperture or slot (12) thus to lock the members (10, 13) together and prevent them from separating until the wedge (16) is withdrawn.

Abstract: The invention relate to fixing a plug in the end of a bar, the assembly being used for production of cylindrical hollow blanks which will be later rolled.The device comprises a plug including at its rear end a shank which can be introduced into an axial socket provided at one end of the bar. A locking means can be introduced transversely through a hole in the wall of the bar and engage its end within a groove realized around the shank. A retaining means holds the locking means in position.The device is used for rapid mounting and dismantling the plug and bar assembly.

Abstract: A convertible retaining ring pliers includes a pair of jaws and a pair of handles all rotatable independently about a common pivot. Each jaw includes a transverse bore spaced from and parallel to the pivot axis for receiving an elongated cylindrical latching pin. Each handle has an associated end plate disposed on one side of the jaws, the end plates having holes to selectively receive an end of a latching pin to selectively latch a jaw to a respective handle. The latching pin bores have elongated grooves and the latching pins have associated friction springs with projecting tabs coacting with those grooves to retain the pins within the assembled pliers. Elongated retaining ring tips have hexagonal shanks received in multi-sided jaw recesses to retain the tips against rotation and to enable selected rotational orientation of the tips.

Abstract: A pin lock is disclosed which comprises a shaft coupling connecting a drive shaft with a driven shaft, preferably in the environment of heavy machinery. The pin lock basically consists of an elongated shaft including means at one end for coupling the shaft to drive means and including receptacle means at another end which receives the driven shaft. After the driven shaft is placed into the receptacle, a pin is inserted into holes formed in the receptacle and this pin overlies the driven shaft to prevent radial movement thereof.

Abstract: An improved retainer for the locking pin of an impact drive socket features an axially-movable sleeve that surrounds the pin and retains the same. The sleeve may be advanced (or retracted) on the socket, against the bias of a spring, thereby uncovering the locking pin. The pin may be removed to facilitate removal of the impact socket from the drive shank of an impact wrench or other tool.

Abstract: The present invention pertains to a foldable bicycle including a main frame comprised of a front frame portion and a rear frame portion, a handlebar structure, a removably, adjustable seat structure, and two removable wheels. The two wheels include a front wheel and a rear wheel both of which are removably mounted to the bicycle frame by quick-release lock mechanisms. Upon removing the bicycles adjustable seat structure and the front wheel and rear wheel, the main frame may be folded by rotating the front frame portion oppositely with respect to the rear frame portion. Upon such folding, the two frame portions form a triangularly shaped unit which lies in three parallel planes.

Abstract: A universal hammer having separable handle and head portions to permit the use of interchangeable heads. The head is formed with a female threaded bore which threadedly engages a male threaded shank. A cross hole is formed through both the head and the shank so that a pin may be inserted to retain the separable parts against relative rotation. A collar is also threaded to the shank and has a cylindrical portion which surrounds the cross bore to prevent removal or loss of the pin. A locking nut jams against the collar to prevent it from becoming loose.

Abstract: A quick-connect tooling system for releasably locking a tool to a spindle. The tooling system includes a rotatable collar mounted on the spindle and having a chordal through bore aligned with a U-shaped chordal transverse groove in the end of the spindle intersecting the axial bore thereof. A manually operable lock is received in the collar bore and spindle U-shaped groove so as to intersect a recess in the tool holder provided adjacent the inner end thereof so as to provide locking shoulders engaging a locking shoulder on the tool holder in retaining the tool holder in the tooling system. Additional shoulders are provided on the lock and spindle for retaining the lock in a released position for facilitating the insertion and removal of the tool holder relative to the spindle. The system is arranged so as to engage the retaining shoulders as an incident of urging of the lock to the release position, the collar being concurrently rotated to permit such disposition of the retaining shoulders.

Abstract: A bushing, sleeve, bearing or like part is secured in a structural member with a clamping device which is screwed into the structural member at right angles to said part to cause a tapered portion of the device converging toward terminating a reduced diameter material end portion to forcibly engage the said part.

Abstract: Two staple-like spring metal parts designated "lock" and "key" are provided to retain an excavating tooth in a holder. The lock part slides into an opening in the holder for the tooth around a reduced diameter portion of the shank of the tooth and thereby prevents withdrawal of the tooth by interfering with the outward movement of a button on the extreme end of the shank. The legs of the lock are biased outwardly by reason of the unstressed shape of the lock. These outwardly biased legs are forced inward by insertion in the opening of a key which fits outward of the lock and forces the legs of the lock inward into locked position, engaging a portion of the shank. When the key is removed, it provides space for outward movement of the legs of the lock and thereby prevents a tendency of dirt compacting in the opening of the holder from preventing withdrawal of the lock.

Abstract: A throttle control for use with a return-biased throttle system in a motorcycle or similar vehicle, which includes a cam lever fitted with a cam body having a slidably mounted, spring-loaded internal plunger, which cam body is mounted in the motorcycle throttle housing with one end of the plunger in close proximity to the throttle cable drum and designed to bias against the cable drum and maintain the cable drum and throttle grip in fixed position upon manipulation of the cam lever.

Abstract: Connecting apparatus for removable dental prostheses comprises a frustoconical male element attached to a base and including a cylindrical transverse groove and an oblique groove. A female part is essentially composed of a block having a frustoconical cavity matching the male element so that the female part can be fitted over the male element. A tubular sleeve accommodates a sliding member which is biased axially by a spring held in place by a cap screwed on one end of the sleeve. A tip attached to a threaded section at the end of the sliding member remote from the spring makes it possible to displace the sliding member axially against the bias of the spring. When the block is fitted over the male element, a section of the sliding member is caught by the edge of the oblique groove and moved axially, then enters the transverse groove, thereby interlocking the male element and the female part.

Abstract: An improved wedge lock collar clamping device which is suitably adapted to prevent a high tension wire stringing cable reel from moving axially along the driving axle of the type including a generally annular body adapted to receive a shaft through the longitudinal opening of the annular member, a transverse opening through the annular member which intersects with the longitudinal opening, the transverse opening being disposed to receive a lock pin, and a lock pin having a tapered surface which affects an interference fit with the shaft disposed in the longitudinal opening of the annular member when the pin is moved in a first direction and when the pin is moved in an opposite second direction the interference fit is eliminated with the clamping device free to move axially along the shaft, wherein the lock pin is provided with resilient end members that are color coded to insure proper directional driving and for safety in operation.

Abstract: A lateral tube transmission control which is adopted for use on conventional automotive transmissions which consists of individual shift levers for each pair of gear sets. Each lever is equipped with a locking device which automatically locks the lever in either a neutral position or an engaged position when the lever is moved to a predetermined position. The levers transmit this movement to the transmission linkages through a concentrically mounted shaft and tubes.

Abstract: Driving device for a beam member of a warping or beaming machine includes a beam member holding piece connected to a beam and a rotatable driving element for the beam member, a clutch shiftable for locking together the driving element and holding piece, in engaged position of the driving device, and for unclocking the driving element and holding piece in disengaged position of the driving machine.

Abstract: A retainer especially for use with impact tools that have a drive shaft adapted to removably receive a tool socket. The socket and shaft have a diametric hole that is in alignment when the tool is attached in driving relationship to the shaft. The retainer has a pin that is adapted for extending through the hole, and there is an integral flexible ring with the pin situated diametrically across it and attached to it at one end.

Abstract: A spacecraft specifically adapted for launch from the space shuttle by means of a cradle having locking and ejection mechanisms mounted therein. The cradle fastens into the payload bay of the space shuttle and returns therewith for reuse in subsequent launches. The spacecraft mounts at three points to the cradle, and the cradle mounts at three points to the shuttle such that a plane through the attachment points passes through the roll axis of the spacecraft at approximately the center of mass thereof. The cradle utilizes the truss structure of the spacecraft to produce the required stiffness by providing a structural tie between the two ends and the bottom of the cradle. At launch, the spacecraft is ejected with both linear and angular momentum, the spin providing gyroscopic stability. The locking mechanisms in the cradle can be remotely controlled to relock the spacecraft to the cradle in the event of an unsuccessful deployment attempt.

Abstract: In a system for interconnecting buoyant float sections in an articulated manner, a receiver assembly for automatically engaging a connector of a type having a longitudinally inclined nose section and a pair of transverse locking grooves. The receiver assembly comprises a receiver housing with an interior channel, a U-shaped locking guillotine member and a locking assembly. The locking guillotine is slideably introduced into a transverse slot in the receiver housing; it rests on a pair of locking bars in the locking assembly with the legs of the locking guillotine extending part-way into the interior channel of the receiver assembly. As the connector is extended into the channel, the legs of the locking guillotine contact the inclined surface of the connector nose section, causing the locking guillotine to slide up within the slot until aligned with the connector locking grooves. The locking guillotine then falls, the guillotine legs sliding down within the locking grooves, to effect interengagement.

Abstract: A locking device for a tilt steering wheel in which a first bracket is mounted on an end of a steering column secured on a vehicle body, a second bracket rotatably supporting a steering wheel shaft is pivotally connected to the first bracket and a wheel drive shaft is connected to the steering shaft by a universal joint.

Abstract: A tool handle is fitted with a spring member having thumb buttons extending through one set of handle apertures and locking buttons extending through another set of handle apertures, and a pool pole is connected to the handle by being fitted within the handle and provided with a set of apertures through which the locking buttons also extend.

Abstract: A fastener assembly is disclosed for connecting an attachment to a frame. The fastener assembly is mounted to a frame portion of, for example, a garden-type tractor. The fastener includes a pin holder, latch pin, and torsion spring. The torsion spring includes two leg portions and a coil portion which is between and integral with the leg portions. The torsional spring secures the latch pin to the pin holder, and it is in constant tension when the latch pin is engaged and disengaged. The attachment is connected to the frame by aligning an opening in the attachment with the latch pin and pushing the latch pin to engage or pulling the latch pin to disengage. When the latch pin is disengaged, the spring coil is compressed and applies an outward force to keep the pin disengaged, and when the latch pin is pushed towards its engaged position, the spring coil resists until it snaps over-center and then it urges the latch pin into locking engagement.

Abstract: A lockable pin comprises a ring-like locking element which is cut at a place on the circumference to provide free ends at which it is pivotally attached to the pin body.In use, the pin is inserted in a throughgoing hole formed in a shaft end and the locking element is brought into engagement with a recess formed in the front end of the pin body or with an annular groove formed in the shaft end. The locking element is firmly held in the recess or groove by the elasticity of the locking element itself or by an upward elastic force acting on the pin body.

Abstract: A wheel assembly adaptable for use with a motor vehicle, a light aircraft, and the like, or in a pulley system or gear train. The wheel assembly comprises an axle or spindle-retained hub member, and a removable wheel member that is releasably connected by unique snap/lock pins. The hub member is made of a more dense material than the material of which the wheel member is made. In the adaption for use with a motor vehicle, light aircraft, and the like, the wheel member (with a tire mounted on it) is significantly lighter than the conventional rim-mounted tire, because of the absence of the hub portion; and, therefore, the wheel member can be easily changed or removed by even the weak, the aged, and the handicapped. Additionally, because the customary bolt/nut or lug/lug nut fastening combinations are not used, the wheel member is easy to change or remove, and, as importantly, the need for a "lug wrench" is eliminated.

Abstract: A brake to decelerate the driving movement of an actuating rod along an axis. The actuating rod is driven relative to a frame by an actuating mechanism. The actuating rod has an external tapered surface whose lateral dimension decreases in the direction in which it is driven. The brake includes a case attachable to the frame which contains within it a peripheral cylindrical brake band and a wedge member. The wedge member has an outer wall, and a tapered inside wall with substantially the same taper angle as the actuating rod. The wedge member and the brake member are disposed inside a passage in the case, with the brake band disposed between the case wall and the wedge member. There is a spacing between the wall of the passage and the outer wall of the brake band. The tapered inside wall is axially aligned with at least a portion of the inside wall of the brake band.

Abstract: A low cost, highly convenient, and non-complicated push button adjuster for chair backrests eliminates bulky and unsightly protruding levers, hand wheels and other external operators. A simple push button normally flush with the rear face of a backrest is depressed to shift a connected locking pin out of a detent slot in a backrest support bar so that the backrest is released for height adjustment. The push button and locking pin are spring-biased to the active locking position.

Abstract: Several forms of latching mechanism are disclosed incorporating a pivotal cam and a spring-loaded plunger. In the preferred form, a lock pin is also included. The latching mechanism is particularly suited for latching interfitted members at least one of which is tubular. In one preferred form, the members are prevented from being interfitted by the lock pin which bars entry into the tubular member. The lock pin may be withdrawn only when the tubular member occupies a preselected orientation relative to a fixed frame member. When so oriented, the plunger's hose is received within a recess. This allows pivotal movement of the cam lever, and permits withdrawal of the lock pin. After the members have been interfitted, the lock pin is reinserted by pivotal movement of the cam lever. In its reinserted position, the lock pin enters aligned slots in the members, thereby locking the interfitted members together.

Abstract: This invention is a releasable pulley device that can be readily attached to the center rear of a boat trailer and through which the tow-in line for a boat is threaded. As the boat is winched in to the rear of the trailer an alignment of the prow with the center rear of the trailer is effected. The pulley device is released from its seating and rides free on the line as the boat is fully winched on to the trailer. This enables the dry loading of a boat from rough water as a one-man operation.

Abstract: A pin release assembly in which a release pin and a pull pin have mating tions which interlock within a fixed collar. The interlocking surfaces of the mating portions are oriented parallel to or normal to the longitudinal axis of the pins so that no frictional side loads are produced when the interlocked pins are pulled in a direction parallel to the longitudinal axis. The release is actuated by sliding the interlocked pins within the collar. The length of travel of the release pin necessary to accomplish the desired release is coordinated with the length of travel of the mating portions within the collar so that the interlocking surfaces are pulled from the confinement of the collar at the same time as the release is accomplished, thereby permitting the pull pin and the release pin to freely separate.

Abstract: Apparatus for detachably coupling two objects together including a pair of coupling blocks relatively movable between remote, inoperative positions, and adjacent, coupling positions. A locking tongue projects outwardly from one of the blocks and is received in a recess provided in the other of the blocks. A locking pin, mounted on the other of the blocks, is provided for movement thereon between a position in which the blocks may be moved toward and away from each other, and another position in which a portion of the locking pin bears against the tongue to urge the blocks toward each other.

Abstract: A locking element for securing two interfitting or cylindrical members or tubes together comprising a helical or curved flat spring having an elongated recess at one end thereof and an inwardly turned pin adjacent the other end thereof, each of said cylindrical members having an aperture therein, said apertures adapted to be aligned and said pin adapted to be inserted through said recess and aligned apertures, the spring member compressively locking the interfitted members securely together, said spring element being secured in compressive engagement with the outermost cylindrical member when the pin is removed from the locking engagement with the interfitted members.

Abstract: The instant invention provides a manually operable locking mechanism for a rotary power tool. The locking mechanism comprises a housing for the rotary power tool, the housing having an opening therein, a spindle rotatably mounted within the housing, the spindle having a radially extending aperture in axial alignment with the housing opening, a loop spring disposed adjacent the housing, the loop spring having a hole in alignment with the opening in the housing, and a lock pin. The lock pin includes an outer section slidingly engaging the opening in the housing, a manually engageable button at its outer end extending radially outwardly from the housing, and a shaft at its inner end extending radially inwardly of the housing and through the hole of the loop spring.

Abstract: The invention relates to a coupling for working vehicles, such as tractors, which coupling comprises on the working vehicle two fixedly connected members, two locking bars and two levers for cooperation with two coupling members on the work attachment. The two fixedly connected members are joined by means of a pipe arranged between their facing sides, in which pipe the two locking bars are slidably mounted for movement through orifices in said members to positions inside and outside of the outwardly facing sides of the latter. The locking bars work within the free surfaces of the members defined by their edge surface. The coupling members have an inner wedge-shaped cavity corresponding to the outer wedge shape of the fixedly connected members, and have orifices in their walls having the same dimensional relationship to their inner wedge-shaped cavities as the locking bars have to the outer wedge shape of the fixedly connected members.