Abstract: A bowling lane maintenance machine (10) performs selected maintenance operations on the surface of the bowling lane, shifts itself to the approach area spanning a plurality of lanes behind the foul line end of the lanes, indexes to another lane, and then shifts to the lane to again perform a maintenance operation thereon. The machine (10) includes structural housing (12) cleaning maintenance assembly (14), propulsion assembly (16), and electronic control system (18); which cooperate for controlled maintenance operations as described above.

Abstract: A collapsible hair brush employs a flat rectangular flexible membrane with a plurality of bristles projecting perpendicularly from one of its flat surfaces with this membrane having its opposite edges journalled on two spaced-apart, parallel elements which elements are disposed at a width less than the width of the membrane whereby the membrane will have an arcuate configuration when assembled on said elements and can be pushed to one side of the elements to open the bristles and the other side of the elements to close the bristles, along with a handle hinged to the brush which can be folded over the membrane when the bristles are closed to make a compact unit for storage.

Abstract: An electric vacuum cleaner has an air discharge duct and an ozonizer arranged within the exhaust duct for defining air passages through which the exhaust air is constrained to flow and generating a corona discharge laterally across the air passages. Ozone is thereby generated and mixed with the exhaust air. The voltage which generates the corona discharge is varied in accordance with changes in room temperature in order to minimize changes in the quantity of ozone generated.

Abstract: Flexible plastic carrying handle adapted for self-stick application as handling assist for large books, e.g. directories, catalogues and other disposable or renewable publications. The handles comprise a continuous contact base strip and a hand grip section formed as an integral one-piece article for more reliable adhesion and ease of application.

Abstract: A fiber processing roll includes a groove provided in a roll surface helically about a longitudinal roll axis. The groove has at least one side wall which is inclined to a radius of the roll that extends to the inclined side wall. The groove has a top opening and a bottom; and the top opening has a width measured parallel to the axis and being greater than the width of the bottom. The fiber processing roll further has a sawtooth wire extending helically about the axis and forming a clothing on the roll. The sawtooth wire has a base rib received in the groove. The base rib has side walls and a bottom end face. One of the side walls of the base rib is inclined to the roll radius. The width of the base rib measured parallel to the axis decreases toward and is the smallest at the bottom end face of the base rib.

Abstract: A belt clip assembly clamps a device (30) onto thin material. The device has a backcover (31) which includes a first set of ears (32) with a first set of pin holes. The belt clip assembly comprises a belt clip (44), a pin (130), and a spring (100). The belt clip (44) has a second set of ears (24,26) with a second set of pin holes (20,22); the pin (130) passes through the first set of pin holes and the second set of pin holes (20,22) for establishing an axis of rotation (56); and the spring (100) is formed to apply force to maintain the belt clip (44) in a closed position against the back cover (31). The spring (100) has a retaining ring (120) formed integrally therewith. The retaining ring (120) couples to the pin (130) for retaining the pin (130) within the first and second set of pin holes (20,22).

Abstract: A hose clamp assembly comprises a belt form of a plate spring body which is in an annular form having opposite ends and is provided with a grooved notch in which an extending piece to be described just below is inserted in a free state to form the same circumferential plane; an extending piece which is integrally provided at one end of the plate spring body along its circumferential direction, bent at its extreme end outwardly along the diametrical direction of the plate spring body to form a stopper and includes a pair of projecting tongues extending outwardly and vertically with respect to its both widthwise sides, the tongues inclining at their extreme ends at the required angles with respect to the stopper; and a receiving piece provided at the extreme end of the other end of the plate spring body, the receiving piece being bent outwardly along the diametrical direction thereof and including a notch somewhat wider in width than the extending piece and a horizontal portion provided with locking grooves spa

Abstract: In a connection of two edges of areal parts which extend at least along one common section essentially parallel to one another, at least one retaining element is arranged at the one edge which form-lockingly engages from behind, as viewed in the edge direction, in a recess in the other edge. At least one projection arranged laterally offset at the one edge in relation to the retaining element in the direction of the engagement from behind, abuts form-lockingly at the part with the recess essentially in the edge direction. To reliably secure together the parts, laser beam welding is used along the common sections of at least one of the retaining element and of the projection.

Abstract: A zipper for closing the mouth of a bag that is formed by a groove on an internal face of tape, on one side, and a rib to be fitted to the groove on another internal face of the tape, on the other side. A bonding agent layer is provided on the outer side of the respective tapes and pastes a parting pattern paper on the outside of these bonding agent layers. This zipper, even if it is made of a substance which lacks heat sealing properties between the inner face of the bag and the zipper, can be attached easily to the inside mouth of the bag by pasting up the bonding agent covered by the parting pattern paper, to the inner face of mouth of the bag, by stripping the said parting pattern paper.

Abstract: A latching apparatus including a tab member detachably securable with respect to a base and housing combination which includes a trigger assembly therein and an ejector assembly for selectively achieving securement or detachment of the tab member with respect to the housing as desired. The housing includes side walls defined in apertures through which a pin may extend upon which the trigger member is pivotally mounted with respect to the housing. The trigger member can be externally manipulated and is operable to selectively engage or disengage the latching slot of the tab. The trigger is biased into engagement with the latching slot of the tab by a trigger spring. An ejector including a notch defined therein is adapted to be selectively compressed by the tab when positioned in locking engagement within the tab channel and includes an injector spring to facilitate ejection of the tab from the tab channel when the trigger is moved to the disengaging position.

Abstract: An apparatus for converting side operated controls of a machine to be front operated. A front control panel or apron is vertically mounted on the machine, preferably using preexisting mounting hardware. Any preexisting front operated controls and front indicators are translated forward to the front of the control panel by extending their control linkages through respective holes defined by the panel. The linkage of each side operated control is articulated and bent through an angle sufficient to redirect the linkage for frontal operation, and the control end of the redirected linkage is translated forward to the front of the panel by protruding through and just beyond the panel. The articulation and redirection is preferably accomplished by a plurality of universal joints and the translation can be accomplished by estension shafts or extension arms. The controls can also be modified to increase or create a mechanical advantage for an operator.

Abstract: A guide device for guiding a slide fastener chain with cloth pieces attached to opposed fastener tapes of the chain. The guide device is adapted to be located near and upstream of a discharge unit for discharging the slide fastener chain with the cloth pieces attached to the opposed fastener tapes. The guide device comprises a pair of guide arms extending perpendicularly to a travelling path of the slide fastener chain, the guide arms extending horizontally toward each other for engaging the attaching portions of the cloth pieces.

Abstract: A hose construction, fastening member therefor and methods of making the same are provided, the hose construction comprising a tubular flexible hose having opposite ends and an outer peripheral surface, a fastening member, and a clamping unit fastened to one of the ends of the hose with the fastening member for substantially circumferentially and radially inwardly clamping the one end onto a member that has been inserted into the one end, the fastening member having a part thereof secured to the outer peripheral surface of the hose and having a recess therein that receives part of the clamping unit therein, the fastening member having snap-fit structure for holding the part of the clamping unit in the recess thereof before the fastening member is secured to the hose.

Abstract: A golf club includes a straight shaft and a metallic member having a first end connected to the lower end of the shaft. The other end of the metallic member is bent to define an obtuse angle with the first end. In a preferred form, a flat metallic stiffener plate is welded or otherwise affixed to one side of the metallic member. These portions are placed in a suitable mold into which polyurethane is admitted, and heat is differentially applied to or removed from the various surfaces of the mold in order that the polyurethane solidifies to form a substantially flat striking layer of dense integral-skin polyurethane juxtaposed against the stiffener plate remote from the metallic member, and a back cushion enclosing the stiffener plate and all of the metallic member. The back cushion is thicker than the striking layer, and is of polyurethane less dense than that of the striking layer.

Abstract: A method of adjusting the length of a vehicle brake booster output rod and assembling the same into the brake booster is provided, the output rod being a thermoplastic or thermoset material that is generally cylindrical in shape with a central longitudinal bore with an axial stop means, and the output rod having an insertable button having a head with an attached stem, the booster having a housing with a central opening surrounding the output rod with a surrounding first formed surface for mounting a master cylinder, the method including piloting a cutting tool by inserting an elongated member into the bore of the output rod, orienting the cutting tool by mating a fixture locationally associated with the cutting tool on the first formed surface of the vacuum booster housing, preloading the output rod with the elongated rod by contacting means with the elongated rod to simulate a spring load of a master cylinder, cutting the output rod with the cutting tool to the correct dimension, removing the elongated memb

Abstract: A method for producing a cylindrical bushing with hydraulic damping includes the steps of preparing an internal ring having an elliptical cross-section including a major axis and a minor axis, disposing within the internal ring a vibration-damping rubber block through which an inner cylinder coaxially penetrates and which has wall portions for defining a liquid chamber, so that the wall portions extend along the minor axis of the internal ring; deforming the internal ring so as to have a circular cross-section; and press-fitting the deformed internal ring into an outer cylinder.

Abstract: A method of machining keyways in shafts comprises the steps of aligning a central line of a spindle of a machine tool with a center line of a shaft to be machined, preliminarily machining a keyway in the shaft with keyway mill arranged on the spindle so as to retain a symmetrical allowance for a finishing machining of the keyways so as to machine walls of the keyway, finishing machining of radiused parts of the keyway at its both ends with a cross-feed of the mill so that a width of radiused parts is greater than a desired width of the keyway, and final machining the keyway with a self-aligning cutting tool mounted on the spindle so that it freely turns and is rectilinearly moved along the keyway.

Abstract: An improved method of manufacture of a shorted turn copper bar rotor which is amenable to high volume production and which provides a copper-to-copper electrical bond among the conductor bar end turn portions at each end of the rotor core. Once the rotor core laminations have been assembled on the rotor shaft, and the conductor bars have been inserted into the core slots, a cylinder or spool element is positioned in abutment with each axial end of the core to define annular cavities into which the conductor bar end turn portions extend. Each cavity has a continuous opening for permitting access to the end turn portions lying therein, and a molten copper plasma is sprayed into the opening of each cavity, thereby forming a copper-to-copper electrical bond among the end turn portions extending from each end of the core. The ends of the assembly are then shortened as necessary by machining to provide the required current carrying capacity.

Abstract: A fuel injector having major components formed by an injection molding process. A coil bobbin assembly is positioned within a magnetic permeable core. An injection molding process provides a plastic housing with the magnetic core and coil bobbin assembly hermetically sealed therein. The molding process also provides a fuel passageway through, and hermetically sealed from, the magnetic core and coil bobbin assembly.

Abstract: An installation for carrying out assembly of metallic reinforcements for construction and public works, in which trestle bents (A-frames) are arranged on moving wagons or carts that slide along rails. The workers remain stationary while the reinforcements move to their work stations so that each of their sections can be bound together. There is one area for loading, another for the binding itself, and a third for unloading, preferably arranged in a closed circuit.

Abstract: A tubular anode includes an electrical connector formed of a diagonally split two-part generally cylindrical slug. The diagonal slit provides an elliptical wedge interface between the two parts and a jack screw is threaded in one part and extends through an enlarged hole in the other. Tightening the jack screw within the tube causes the two parts to offset and wedge against the inside of the tube. The two parts include an aligned slot which interests the major axis of the elliptical interface and a lead wire or cable is electrically secured to one of the parts within its slot. The slot is configured to press the lead or cable against the interior of the tube. The lead wire for a string anode extends through the slot of the other part. In the formation of an anode string the tubular anodes are threaded onto unspooled insulated wire or cable, a short portion of the insulation is removed at each connector location, and with the tubular anode offset, a connector is secured to the bare wire.

Abstract: Microelectrodes and methods for making the same are disclosed which have electrode tip diameter of less than 10 .mu.m. The microelectrodes include a tapered electrode wire sealed in, and surrounded by, a tapered insulator tube. In one preferred embodiment, an annealed platinum wire approximately 75 .mu.m in diameter is inserted in an insulator tube, such as a borosilicate pipette, having an inner diameter of approximatley 600 .mu.m. The pipette is heated to the softening temperature of borosilicate and drawn using a conventional pulling technique. As the inner diameter of the pipette draws down, it engages the annealed platinum wire and causes the wire to also draw down in diameter. Careful selection of the relative diameters of the pipette and the platinum wire ensure that the two will break at essentially the same time thereby forming a microelectrode having a platinum disk electrode of less than 10 .mu.m diameter.

Abstract: In a frictionally sliding structure, a metallic intermediate member is provided, which has a head and a stud. The stud is interfit into a recess provided with a tappet, while the head has a ceramic chip on which a cam is adapted to frictionally slide.

Abstract: A method of repairing stator blades in a turbine comprises the steps of making a pre-shaped insert of a material the same as or compatible with the material of the stator blade, the size of the insert is such that it forms a substantial part of the stator blade, the method including the step of removing a piece of material from the stator blade including the damaged part or part that it is required to modify and welding in the new insert.

Abstract: A condenser having two piece die formed condenser tube parts that are joined along a beveled outer edge. The tube material is braze cladded on both sides for corrosion resistance and for high quality internal braze bonding of (1) longitudinal tube webs for optimizing burst strength, and (2) the tubes to associated air centers which are not cladded for an economical unit. The tubes can be readily made in a multiport or single port design by die forming the longitudinal webs in each tube part, and at discreet lengths along the tube length to provide a cut off area for sizing the tube and a smooth circumferential area where the tube parts with a beveled outer edge enter the header providing a close fit and high quality brazed joints. This tube design provides material and cost advantages over the conventional extruded tubes or roll formed condenser tubes and is readily fabricated using corrosion resistant alloys providing long service life.

Abstract: By providing at least three separate and independent foil members each of which cooperate with a separate and independent cutting blade system which is biased into engagement with the foil member and freely flexible in a plurality of directions, a substantially improved electric dry shaver is obtained. In the present invention, a unique cutting blade support assembly is provided which assures free flexible movement of the cutting blades, while also continuously and positively biasingly maintaining the cutting blades in contact with the foil member. In addition, the multiple foil construction of this invention provides a system wherein foil members having different physical characteristics are mountable to the shaver, thereby providing substantially enhanced cutting capabilities and more universal applicability to unusual or mixed shaving conditions.

Abstract: A segmented guard bar and skin flow control members disposed in the spaces between the guard bar segments. Though not limited to any specific type of razor, the present invention is particularly suited for use with a flexible safety razor having a cap member at least one and preferably two blades separated by a spacer, and a blade seat having a plurality of blade support portions separated by corrugations and a segmented guard bar with each segment independently connected to the blade support portions.

Abstract: A pipe slitter comprises a base for fixing the slitter to a pipe to be slit thereby. The base includes a pair of end plates for mounting transversely of the pipe and a carriage guide for coupling the end plates to each other. The carriage guide extends longitudinally of the pipe. The carriage guide movably supports a first carriage. A second carriage movably supports a slitter blade. The second carriage is movably supported on the first carriage for movement of the slitter blade longitudinally and transversely of the pipe.

Abstract: A nut cracker having a pair of opposed jaws with facing elongate concavities pivotally movable between open and closed positions about a pivot axis parallel to the longitudinal extend of the jaws. The concavities are smooth surfaced and the jaws manipulated by a pair opposed handle portions each rigid with one of the jaws and to the opposite side thereof from the pivot axis.

Abstract: An improved hand tool for cutting flex-duct material comprising a plier-type wire cutter having retaining member mounted on the outside of the jaws of the wire cutter for releasably retaining a disposable razor-type blade.

Abstract: A hair cutter having a cutter head with a cutter comprising a toothed stationary blade and a toothed movable blade which define a cutting plane between toothed edges thereof. The movable blade reciprocates relative to the stationary blade in hair shearing engagement between the toothed edges with the movable blade defining a cutting edge at its leading toothed edge. Disposed at the front end of the cutter head is a pair of first and second hair pressing members with respective hair contacting edges. The first hair pressing member is formed to have a number of comb slots arranged in parallel with the toothed edges of the movable blade with the comb slots defining at their bottom ends the hair contacting edge.

Abstract: An improved robotic contractile device having, besides general industrial and other-usage applicability for automation and other purposes, particularly attractive utility in and for prosthetic applicances and which is characterizable in being able to function in a way remarkably analogous to that of biological muscle is structurally made up of an expandable conduit which is contractible on fluid inflation with a plurality of longitudinally-directed filaments peripherally-secured thereabout that are connectable with an object to be moved or displaced as a result of the contractability experienced upon inflation of said conduit; there being associated means in the device for introducing and exhausting fluid under pressure to the interior of the said conduit in order to inflate same to effectuate its motive contraction action and deflate it to its normal rest condition of maximum or intermediate extension.

Abstract: The invention is directed to a shaving foil for a dry shaving apparatus, including a plurality of adjacent polygonal apertures. In the area of the nodal points of intersecting partitions which separate several contiguous apertures, knob-type protuberances are provided on the side of the shaving foil engaging the skin surface.

Abstract: A flexible extension for a hand held power tool is disclosed. The extension has a single flexible reciprocating rod to transmit motion generated by the power tool to a cutting tool at the other end of the extension. A handle grip assembly surrounds the extension adjacent the reciprocation tool. In use, the operator holds the power tool in one hand and the handle grip in the other. The extension permits useful work to be done in close quarters or an otherwise inaccessible location.

Abstract: The method and apparatus for controlling the displacement of a steerable driven trailing machine with respect to a leading machine by measuring the separation between the machines and inputting such measurement to the trailing machine drive control, and measuring the angular disposition of the trailing machine and inputting the steering control of the trailing machine.

Abstract: A probe head (10) includes a support (12) by which the probe head is retained on the quill of a coordinate positioning machine, and a rotor (14) which is magnetically retained on the support (12). The rotor (14) is rotatable between a plurality of indexed angular positions provided by a ring or balls (26) and three adjacently positioned pairs of rollers (24). A drive dog shaft (20) is linearly movable to disengage the balls (26) from the rollers (24), and rotatable to rotate the rotor (14) to a new indexed position, whereupon the drive dog shaft (20) is retracted to re-engage a set of three balls (26) with the rollers (24). Exchange of a measuring probe (16) is performed by removing the entire rotor (14), and exchanging it for a further rotor carrying a different measuring probe. The engagement elements provided by rollers (24) and balls (26) thus serve the functions of (a) indexing and (b) repeatably retaining a rotor (14) on the support (12).

Abstract: Methods for verifying the mechanical integrity of an alignment bracket, particularly a multi-configurable alignment bracket, used for aligning co-rotatable in-line machine shafts, and for determining the amount of alignment bracket "sag" to be accounted for when subsequently employing readings taken with the alignment bracket. The invention employs a previously-established relationship between sag and deflection of the alignment bracket under the influence of a known force to determine sag and to verify mechanical integrity of the alignment bracket in situ, avoiding the need for the usual prealignment sag determination on a separate straight pipe or mandrel. In the practice of the method, the alignment bracket is set up in a position for use, on the actual shafts being aligned. The extension bar of the alignment bracket is positioned above the centerlines of the shafts, and a known force is applied by hanging a known weight at a predetermined point on the alignment bracket.

Abstract: An attachment securable to the chuck of a hand-held power drill and adapted to clamp either a paint brush or a paint roller, so as to spin the same for cleaning by centrifugal force. The attachment is made of three separate parts, namely: a jaw unit, a sleeve and a cap nut, the latter provided with a spindle for insertion into the power tool chuck. The jaw unit includes a screw portion threaded within the cap nut and having a cylindrical extension in turn extended by a pair of spring jaws for receiving therebetween and clamping the narrower portion of a paint brush handle adjacent the brush bristles. A sleeve surrounds the arms of the two jaws and its opposite ends engage the cap nut and conical wedging surfaces of the jaw heads. Rotation of the cap nut with respect to the jaw unit causes axial movement of the sleeve which in turn causes retraction of the jaw to clamp the brush handle. The outer surface of the sleeve has paint roller clamping ribs to hold a paint roller around the sleeve.

Abstract: A drying apparatus for rubber boots and other items comprising hollow housing equipment with open front and rear surfaces, disinfectant spraying equipment a low-temperature dehumidifier connected in free communication with the housing equipment, wherein the housing equipment is partitioned into rows and columns of housing boxes by partition frames and has its bottom surface designed to serve as slit shelves so that the drying apparatus for rubber boots and other items can dry, in particular, rubber boots used at work, or outfits such as golf bags and ski wears at low temperature, which does not damage the material, by forcible air convection and the disinfectant is carried on the air stream and distributed throughout the housing equipment to perform sanitary drying and dehumidification.

Abstract: In a screen drum device with a fan mounted endwise for generating suction through the screen drum surface, in front of a screen drum jacket, a baffle cover is usually provided. This baffle cover generates in a baffle chamber in front of the baffle cover, the accumulated pressure which is required for uniform processing of a web of material. In order to be able to handle optimally webs of different widths on the screen drum, the baffle cover in the vicinity of the narrow width of the goods is made so that it can be either removed completely or is given an opening mechanism, or the baffle cover has an additional screen cover located parallel thereto and displaceable with respect to the baffle cover.

Abstract: A blower cleanout door assembly including a door panel pivotally connected to a blower housing for supporting a blower assembly including a blower wheel and motor for swinging movement of the door panel between a closed position covering a blower wheel opening in the housing with the blower wheel within the housing for operation and an open position in which the blower wheel is swung exteriorly of the blower housing out through the blower wheel opening for ease of cleaning the blower wheel and blower interior.

Abstract: The apparatus is arranged to provide for a lotion container contained within an upper and lower shoe sole portion, wherein the sole portion includes supporting bands for mounting the container to an individual's foot. Confronting and mirror image cavities within the upper and lower sole portions receive a fluid bladder therewithin. A modification of the invention includes the upper and lower sole portion separable relative to one another to permit selective replacement of the fluid bladder.

Abstract: The present invention relates to an insert member for use within the sole region of an athletic shoe. The insert member is made from a resilient material and provides improved energy return to the outsole to enhance recovery from the forces applied to the shoe.

Abstract: A shoe for e.g. sporting activities is disclosed. The shoe has a peripheral portion including a pair of sections divided in a longitudinal direction of the shoe along a foot-arch portion thereof. The sections are configurated so that the sections are overlapped with each other at least at a portion of the foot-arch portion when cut portions of the respective sections are folded out with upper areas of the respective cut portions being placed in contact with each other. And, the sections are sewn to each other at the cut portions. Then, the peripheral portion is attached to a sole of the shoe with the foot-arch portion being recessed into interior of the shoe.

Abstract: A universal protective shield includes a central portion with three or more ingers integral with the central portion; openings located between adjacent fingers and above the sole of the foot covering to which the shield is attached, the openings permitting the fingers and the central portion to be adapted to conform to a foot covering: and screws for fastening the protective shield to a foot covering via bores located in the fingers. Flaps, attached to the fingers, diminish the size of the openings. The present invention may be adapted from a flat template or reformed to fit different shaped foot coverings.

Abstract: A plow assembly useful for moving material from surfaces such as roadways in various selectable discharge directions includes a moldboard assembly and pivotable frame. The moldboard assembly is capable of being oriented in a right side discharge or a left side discharge in response to pivoting movement of the pivotable frame. A tripping mechanism is included to prevent damage of the plow assembly from obstacles located on the plowing surface. A cutting edge of the plow assembly is secured to the moldboard assembly by a wedge mechanism thus allowing quick cutting edge replacement.

Abstract: A line-guide advancement mechanism for copyholders of the type for holding a document containing information to be transcribed and containing a linearly moveable line-guide for highlighting individual lines of information. The line-guide advancement unit is structured to be able to fixably attach to an existing copyholder (10) and a line-guide (46). The unit contains a drive mechanism (12) and an operator's foot pedal (20) which provide step-wise movement to the line-guide (46). The drive mechanism (12) can be adjusted via a knob (36) and vernier scale (74) to provide a wide range of spacings in the movement of the line-guide.

Abstract: A multi-sided display device for displaying selected advertising information corresponding to a particular product on display. The display device is rotatably mounted such that one of a plurality of display faces of the multi-sided display may be selected for viewing. A window opening on each display face is provided such that a customer may interactively select a variety of product information for viewing through the window opening. The device can be slidably mounted to a display shelf, peg board, floor stand, or other support surface such that it may be raised to an upright position in order to facilitate access to inventory codes or UPC codes on the end of the shelf.

Abstract: A fishing pole mounting device to signal the movements of a fishing pole when a fish strikes the bait. A cradle means rests on top of a box shaped enclosure. The cradle holds the pole and translates downward movements of the pole into an electrical signal for audible and/or visual alarms.

Abstract: A trolling device for a fishing lure includes a frame to be towed through water. A spool on the frame has a length of fishing line for connection to a fishing lure. A drive means driven by the force of water as the frame is towed through water causes the line to wind upon the spool. The drive means is periodically disengaged to allow the spool to freewheel and the line to unwind. Thus, the lure will alternately accelerate toward the frame and drop back from the frame as the frame is towed through water. A selectively operable pause means is provided to delay retrieval of a lure toward the frame for a predetermined period of time, and further means are provided to disengage the drive means from the spool upon application of excessive force to the towing line.