Abstract: A linear drive mechanism includes first and second tapes formed of resilient material that each have an inner surface, a parallel outer surface, a first end, a second end and a concave/convex cross-section. A first tape guide has first and second guide slots that are sized and shaped to fit slidably about the first and second tapes and located to position the outer surfaces of the tapes adjacent one another. At least one second tape guide has third and fourth guide slots that are sized and shaped to fit slidably about the tapes. The tapes are connected together adjacent their first ends. A drive system has a mounting for the first tape guide that locates it orthogonal to lengths of the tapes. The drive system has rolled storage for the tapes and driving members for extending and retracting the tapes through the first and at least one second tape guide.

Abstract: In a parking release actuator, a related motion between a motor and a cable uses a number of worm gears and worm wheel gears using rotation motions in different directions, and the cable is pulled or released by a cable guide converting a rotation motion into an angular motion. Therefore, a number of worm gears and worm wheel gears and the cable guide are made compact and intensive. As a result, it is possible to reduce the entire size of a housing and significantly reduce the operation of the operator required for manual locking or manual release, thereby further improving convenience.

Abstract: Embodiments of the invention include a system for guiding an instrument. The system may include a frame and a bearing assembly supported by the frame. The bearing assembly may include an outer tubular member supported by the frame and including a proximal end and a distal end. The bearing assembly may also include a bearing at least partially disposed within at least one of the proximal end and the distal end of the outer tubular member. The channel may extend through the outer tubular member and the bearing.

Abstract: A mechanism for raising or lowering a sidewall of a container. The mechanism has a shaft that extends across a substantial width of the container adjacent an upper frame support. The shaft has two spools fixedly attached to opposing ends of the shaft. The mechanism has two cables each having one end secured to an associated one of the spools, an opposing end secured to the sidewall, and a length wrapped around the spool and extending between the spool and sidewall. The mechanism has a drive for rotating the shaft to unwrap a portion of the cable allowing for the sidewall to rotate away from the container in response to gravity, and to wrap a portion of the cable around the spool, causing the sidewall to rotate toward the container.

Abstract: A force transfer assembly that can transfer force at various angles and through relatively small bend radii includes a roller chain constrained in a raceway channel. The configuration provides multi-dimensional support so that a roller chain assembly, typically constrained to tensile loading, may also be used for compressive loading. A method for transmitting force along a non-linear path includes configuring a raceway channel having an upper raceway surface and a lower raceway surface, securing a chain assembly into the raceway channel between the upper raceway surface and the lower raceway surface with at least one lateral securing mechanism, and applying a tensile or compressive force to one end of the chain assembly in order to have the chain assembly transfer the tensile or compressive force to the other end of the chain assembly.

Abstract: A linear actuator, in particular telescopic legs for height-adjustable tables, and comprising an outer profile (18), a spindle (7) mounted at an upper end of the outer profile, a transmission (8) connecting the spindle (7) with a reversible electric motor, a spindle nut (11) secured against rotation on the spindle (7), an intermediate profile (10) mounted with its one end on the spindle nut (11), a guide at a lower end of the outer profile (18) for the intermediate profile (10), a cord element (12, 20; 26) secured at the lower end of the outer profile (18) and connected via a guide with an inner profile (14), such that this together with the intermediate profile (10) is telescopically pushed out of and into the outer profile (18) by the rotation of the spindle.

Abstract: A deceleration device includes a driving device and a transmission assembly. The transmission assembly includes a driving member, a first active subassembly, a second active subassembly, a first transmission member, a second transmission member and two regulatory mechanisms. The driving member is connected to the driving device. The first transmission member connects the driving member to the first active subassembly, and is driven by the driving device, and rotates the first active subassembly. The second transmission member connects the first active subassembly to the second active subassembly, and is driven by the first active subassembly, and rotates the second active subassembly. The two regulatory mechanisms elastically resist the first transmission member and the second transmission member, respectively.

Abstract: A rotary apparatus comprises a rotary bobbin, a processing component fixedly attached to the bobbin and connectors fixedly connected to the processing component. At least one helical groove is located along the bobbin wherein the connectors are housed. A motor coupled to the processing component is operative to rotate the processing component together with the bobbin in two opposite rotary directions.

Abstract: A roller cover and mechanism of operation of a roller cover is described. The roller cover comprises a body portion and at least one track along which the body portion is adapted to move. The mechanism of operation of the roller cover comprises a winding system, and winder and a drive system for raising and lowering the track. The winding system comprises a first spindle and a second spindle and a supporting sheet. The winder comprises an arm secured substantially perpendicularly to the longitudinal axis of the first spindle. The drive system comprises an articulated arm rotatably attached at one end thereof to the track.

Abstract: A deceleration mechanism comprises a driving member, a driven member, an actuator device connected to the driving member, and a transmission member coiling around the driving member and the driven member. The transmission member comprises a positioning portion and a coiling portion extending from opposite sides of the positioning portion. The position portion is fixed to the driving member, the coiling portion coils a plurality of windings on the driving member, and then coils on the driven member. The number of windings of the transmission member coiled around the driving member is equal to or more than the transmission ratio of the deceleration mechanism.

Abstract: This invention relates generally to mechanics, and more specifically, to systems and methods for providing an ergonomical multi-speed wheelchair.

Abstract: A linear actuator comprises a pair of chains. Each chain has a first link and a second link. The second link of each chain is adjacent to the first link of the chain. A pivotal connection pivotally connects the first and second links. The first link is pivotable about a pivot axis which is non-perpendicular to a longitudinal axis of the first link. A chain connecting member connects the chains at distal ends thereof. A drive mechanism moves the chains between an extended position and a retracted position. At least a portion of each chain is helically wound when the chains are in the retracted position.

Abstract: A mechanical linkage, for use on original equipment or for replacement of existing hydraulic ram based actuators, comprises a rotary to linear transmission. The transmission provides two co-rotatable capstans of different diameters, and two idler wheels spaced on a longitudinally slidable linkage. The capstans are linked to a first of the idler wheels by means of a pulley line wound from the first capstan, around the wheel, and then back to the second capstan. The first capstan is also linked by means of a pulley line to the second idler wheel, and the second capstan likewise to the second idler wheel by a third pulley line. The difference in diameters causes a differential winding of the various lengths of pulley line between the idler wheels and the capstans, which urges the linkage to slide relative to the capstans. Cooperation of the two capstan/idler wheel combinations compensates for possible backlash.

Abstract: A single or dual channel cord enclosure to hide a cord drawing a shade or blind up or down is disclosed. An apparatus includes a roller mechanism adapted to drive a roller to operate an architectural cover; a cord mechanism adapted to drive the roller mechanism; and an enclosure adapted to conceal at least a portion of the cord mechanism. The enclosure may completely enclose the cord and utilize a slider to actuate the cord within the cord channel enclosure. In another embodiment, an apparatus for actuating an architectectural covering includes an enclosure configured to receive a cord mechanism; a roller mechanism provided on an end of the enclosure; and a slider configured to be movably engaged to the enclosure so that moving the slider actuates the roller mechanism to lift or lower the architectural covering. A method of making an apparatus for actuating an architectectural covering is also disclosed.

Abstract: Since the rotating unit is disposed so that the drive part, which constitutes the rotating unit, is located in the inner side of the bent portion with the curved surface of the CABLEVEYOR in the side of the straight axis, there is no problem occurs by locating the drive part connected with the rotating unit in the inner side of the bent portion of the CABLEVEYOR. Therefore, the dead space formed in the inner side of the bent portion of the CABLEVEYOR can be used effectively.

Abstract: A power transmission mechanism and a robot arm using the same are described. The power transmission mechanism at least includes a first power source, a second power source, a plurality of steel ropes, a support arm component, a stopping component and a joint component. The stopping component is disposed in the support arm component and includes a first stopping unit and a second stopping unit that rotate coaxially. The first and second power sources and the joint component are disposed at two ends of the support arm component. The first and second power sources transmit power via the first stopping unit and the second stopping unit through the plurality of steel ropes to drive the joint component to perform a two-degree-of-freedom motion. The support arm component and the joint component can be applied in an upper arm and an elbow of a robot arm, thereby constituting a multi-degree-of-freedom robot arm.

Abstract: A displacement member can be displaced in a direction substantially perpendicular to a moving direction of a translation member that is held on a base member so as to reciprocatingly move thereon linearly, and an elastic mechanism secured to the base member accumulates and releases elastic energy in accordance with the distance to the displacement member. Protruding members of the translation member are pressed against a transmission member by generated force provided by the energy release from the elastic mechanism; thus, a distance adjusting operation between coupling mechanisms coupling the transmission member and the displacement member is controlled by a control device so that the relative position and relative angle between the displacement member and the transmission member are changed.

Abstract: A strap-drive system that provides smooth, reliable potentiometer adjustment, particularly in devices used in conjunction with musical instruments.

Abstract: The present invention provides a controller for a magnetic wheel, which is added with an alternated adjusting seat within the external rotary disk of the magnetic wheel controller. A flexible locker of alternated adjusting seat can be flexibly locked into second latch groove of external rotary disk. When a cam shaft of a tester has not reached a signal locating point, but the cable of magnetic component has been fixed during initial assembly of the magnetic wheel and controller, the flexible lock is flexibly locked with a second latch groove, such that the external rotary disk and alternated adjusting seat will continue to rotate until the tester senses the locating signal. Thus, no manual adjustment of cable is required in order to shorten assembly time and improve manufacturing efficiency for a higher practicability.

Abstract: Powered lift for lifting and carrying a motor cycle or other recreational vehicle behind a motor home. The lift has a base structure to be connected to the chassis of the motor home and a platform on which the motor cycle or other vehicle can be placed. Connection is through to swivel arms. In the base structure a mechanism is provided for rotatably driving the swivel arms between a lower position wherein a vehicle can be loaded/unloaded from the platform to an upper conveying position. Rotation of the swivel arms can for example be effected through a ram which displaces a chain engaging sprockets connected to the swivel arms.

Abstract: A displacement member can be displaced in a direction substantially perpendicular to a moving direction of a translation member that is held on a base member so as to reciprocatingly move thereon linearly, and an elastic mechanism secured to the base member accumulates and releases elastic energy in accordance with the distance to the displacement member. Protruding members of the translation member are pressed against a transmission member by generated force provided by the energy release from the elastic mechanism; thus, a distance adjusting operation between coupling mechanisms coupling the transmission member and the displacement member is controlled by a control device so that the relative position and relative angle between the displacement member and the transmission member are changed.

Abstract: A counterbalance for a ramp assembly includes a chain assembly and a spring assembly. The spring assembly includes a spring and first and second spring fittings. The first spring fitting restrains a first end of the spring when the ramp portion is between a neutral position and the stowed position and moves the first end of the spring toward a second end of the spring when the ramp portion moves from the neutral position toward the deployed position. The second spring fitting is spaced from the first spring fitting and restrains the second end of the spring when the ramp portion is between the neutral position and the deployed position. The second spring fitting moves the second end of the spring toward the first end of the spring when the ramp portion moves from the neutral position toward the stowed position.

Abstract: An apparatus is described for the intermittent drive of a spindle (1) for a workpiece fixture, especially a forging machine, comprising a traction gear (7) consisting of a traction means (13) guided endlessly about a driving wheel (6) and a driven wheel (8), a continuous rotary drive (5) for the driving wheel (6) and a superposition drive (10) performing rotary oscillations. In order to provide advantageous constructional conditions it is proposed that the superposition drive (10) comprises a support (11) which can be displaced in a rotary oscillating manner about the axis of the driven wheel (8), and deflection rollers (12) held on the support (11) for the traction strands (14) moving towards and away from the driving wheel (6).

Abstract: The apparatus for driving a divider element which is slidable linearly and/or in curves, comprising a drive assembly guided by two running wheels on a running surface of a rail, the drive assembly having a drive shaft driven by an electric motor and a gearing, the drive shaft being coupled by a toothed gear to a toothed belt connected to the rail, and the drive assembly being connectable by a load shaft to the divider element. The drive assembly having a traveling assembly unit with a traveling assembly body having a head piece detachably connected to a drive unit, wherein the electric motor, and the gearing are arranged such that the drive shaft emerges vertically upward from the drive assembly so as to enable the toothed gear mounted on the drive shaft to engage the toothed belt retained above the running surface of the rail.

Abstract: A kitchen device, in particular, a refrigerator or freezer, with an interior, in which at least one height-adjustable support for accommodation of goods is provided, wherein at least one transport carriage running along guide rails is provided on the kitchen device, wherein said transport carriage may be fixed to the support and adjusted in height by a drive with a height adjustment. The invention is characterised in that the shell surface may be particularly simply and easily adjusted for height without the need to remove the goods from the kitchen device operation of the kitchen device being particularly simple.

Abstract: Rotary to linear and linear to rotary motion conversion devices that consist of rotational elements, at least two flexible linking elements, and motion elements are disclosed. Rotary elements and motion elements are connected by the flexible linking members, which twist around each other when rotational elements rotate and thus produce pulling force on the motion elements. A methodology to design the motion conversion devices and robotic joints incorporating the motion conversion devices are disclosed.

Abstract: The present invention relates to a rotary switch assembly for an air conditioner in a vehicle, in which detent means is mounted on a holder joined to a front housing to mount a knob on the holder, so that a cable switch assembly for operating a cable to control the air conditioner can be used to various switches in common without regard to existence and nonexistence of a detent structure or positions of the detent structure and the rotary switch assembly can prevent a movement of the knob and effectively transfer a manipulation force of the knob to the cable switch assembly since the detent means is mounted on the holder adjacent to the knob.

Abstract: An articulated driving mechanism (2) is composed of several inflexible links (1, 1?, 1?, 79, 84) in succession, the links of each pair of adjacent links being interconnected by means of a link pin (16, 16?, 16?), arranged in both the adjacent links in such a manner that the links are pivotal in relation to one another about the axis of the pin. The links of each pair of adjacent links are mutually displaceable in the transverse direction of the link pin between a first position, in which the adjacent links are pivotal in relation to one another about the axis of the link pin, and a second position, in which corresponding meshing surfaces of each adjacent link abut one another and lock against mutual pivoting of the adjacent links. The link pin is displaceable in an elongated hole (23, 82, 89) in at least one of the links.

Abstract: A linear band guide device for supporting and defining a path for a band includes an elongate band support element, a first band end support at a first end of said elongate band support element, a second band end support at a second end of said elongate band support element. The elongate band support element has a substantially flat top surface capable of functioning as a slide bed for the band.

Abstract: A drive unit for a power operated vehicle closure has a track, a guide moveable along the track, a link attached to the guide at one end and adapted to be attached to the vehicle closure at the opposite end, and a motor assembly for moving the guide along the track. The motor assembly has an electric motor and a speed reducer driven by the electric motor that has a first stage and a second stage. The first stage includes a belt drive and the second stage is a spur gear set. Alternatively the first stage is a worm gear and a mating helical gear. The worm gear preferably has a high lead angle and a high number of leads. The speed of the electric motor is reduced to about 1000 rpm or less in the first stage permitting the use of spur gears in the second stage while retaining quiet operation.

Abstract: A counterbalance for a ramp assembly includes a chain assembly and a spring assembly. The spring assembly includes a spring and first and second spring fittings. The first spring fitting restrains a first end of the spring when the ramp portion is between a neutral position and the stowed position and moves the first end of the spring toward a second end of the spring when the ramp portion moves from the neutral position toward the deployed position. The second spring fitting is spaced from the first spring fitting and restrains the second end of the spring when the ramp portion is between the neutral position and the deployed position. The second spring fitting moves the second end of the spring toward the first end of the spring when the ramp portion moves from the neutral position toward the stowed position.

Abstract: A counterbalance for a ramp assembly includes a chain assembly and a spring assembly. The spring assembly includes a spring and first and second spring fittings. The first spring fitting restrains a first end of the spring when the ramp portion is between a neutral position and the stowed position and moves the first end of the spring toward a second end of the spring when the ramp portion moves from the neutral position toward the deployed position. The second spring fitting is spaced from the first spring fitting and restrains the second end of the spring when the ramp portion is between the neutral position and the deployed position. The second spring fitting moves the second end of the spring toward the first end of the spring when the ramp portion moves from the neutral position toward the stowed position.

Abstract: A counterbalance for a ramp assembly includes a chain assembly and a spring assembly. The spring assembly includes a spring and first and second spring fittings. The first spring fitting restrains a first end of the spring when the ramp portion is between a neutral position and the stowed position and moves the first end of the spring toward a second end of the spring when the ramp portion moves from the neutral position toward the deployed position. The second spring fitting is spaced from the first spring fitting and restrains the second end of the spring when the ramp portion is between the neutral position and the deployed position. The second spring fitting moves the second end of the spring toward the first end of the spring when the ramp portion moves from the neutral position toward the stowed position.

Abstract: Apparatus for the motorized opening and closing of a motor vehicle body part which can be pivoted with respect to a vehicle body about a hinged lid axis includes a guide cylinder having a first end and a second end which can be coupled to the body at a pivot axis which is parallel to the hinged lid axis, a piston guided displaceably in the cylinder, and a piston rod having one end attached to the piston and an opposite end which protrudes from the first end of the cylinder and can be coupled to the pivotable body part at a distance from the hinged lid axis. A drive device drives first and second Bowden cables, which extend in parallel from the second end of the cylinder, to displace the piston in the cylinder. The first Bowden cable includes a sheath which is supported on the piston and a core which is fixed to the first end of the cylinder. The second Bowden cable includes a sheath which is supported on the second end of the cylinder and a core which is fixed to the piston.

Abstract: A linear actuator, in particular telescopic legs for height-adjustable tables, and comprising an outer profile (18), a spindle (7) mounted at an upper end of the outer profile, a transmission (8) connecting the spindle (7) with a reversible electric motor, a spindle nut (11) secured against rotation on the spindle (7), an intermediate profile (10) mounted with its one end on the spindle nut (11), a guide at a lower end of the outer profile (18) for the intermediate profile (10), a cord element (12, 20; 26) secured at the lower end of the outer profile (18) and connected via a guide with an inner profile (14), such that this together with the intermediate profile (10) is telescopically pushed out of and into the outer profile (18) by the rotation of the spindle.

Abstract: An electronically servo-assisted bicycle gearshift and method for electronically shifting the gears of a bicycle involves the steps of: receiving a signal requesting a displacement of a chain of a bicycle gearshift from a first sprocket to a second adjacent sprocket of a gearshift group comprising at least two sprockets; if the first sprocket has a smaller diameter than the second sprocket, obtaining an upwards gear-shifting position for the second sprocket, if the first sprocket has a larger diameter than the second sprocket, obtaining a downwards gear-shifting position for the second sprocket; and driving an actuator of the gearshift group to displace a guide element of the chain in an axial direction with respect to the gearshift group from the first sprocket to the upwards gear-shifting position for the second sprocket or to the downwards gear-shifting position for the second sprocket, respectively.

Abstract: A rotary to linear converter in a remotely controlled toy environment for translating the bidirectional rotation of a servo motor into the linear displacement of a tab connection point. A single spool member which is driven to rotate incrementally from one angular position to another, and a flexible, nonstretchable linkage, which is integral to the spool at one end and integral to a tab at the opposite end. During the period of rotation of the servo motor-driven spool, the integral linkage is either fed off the spool or wound onto the spool thereby traversing the linkage and the integral tab through guides in the housing and lid, which act as alignment restraints tensioning the linkage and tab to eliminate slack.

Abstract: A motor-driven steering apparatus includes a steering member reciprocating in correspondence to a steering wheel operation, a ball nut inserted to a ball thread shaft of the steering member, a drive pulley driven by an electric motor, and a driven pulley coupled to the drive pulley via a belt and integrally rotating with the ball nut. The drive pulley is provided with a pulley main body which is rotatably supported in both sides in an axial direction by a pair of rolling bearings, and is provided with a plurality of tooth portions, and a pair of regulating members attached to both end sides in an axial direction thereof. The respective regulating members is pinched between an inner ring of the rolling bearing and an end portion of the pulley main body.

Abstract: A rotary driving source is connected to one end of a frame. The rotary driving force of the rotary driving source is transmitted to a slider by the aid of a driving pulley, a belt member, and a driven pulley. The slider is displaced in the axial direction of the frame while being guided by a guide mechanism. Each of the frame and the slider is formed of, for example, an aluminum alloy. First guide rails are installed in the frame and second guide rails are installed in side surfaces of the slider. The first guide rails and the second guide rails are formed of a metal material subjected to a hardening treatment.

Abstract: An improved assembly for use in an in-line starter valve. A flexible material system in the form of a flexible belt is used to translate motion from a manually operable wrench shaft to a piston rod in order to render an in-line starter valve to a closed, partially opened, or an extreme opened position. When the wrench shaft is manually rotated, tension is imparted on the flexible band which, in turn, translates tension to a piston rod which then travels longitudinally resulting in the opening or closing of the in-line starter valve. An index mark on a handle of the wrench shaft indicates the closed, partially opened, or extreme opened position of the in-line starter valve. The use of the flexible belt affords greater durability, less weight, and less costly production than the prior art assemblies.

Abstract: An electric actuator comprises an actuator body which is a rectangular tube have having two pairs of opposing surfaces disposed in parallel and which has a slit formed to extend by a predetermined length along an edge of the rectangular tube; a slider which reciprocates along the slit of the actuator body by a rotary driving source; the rotary driving source which is connected to one end of the actuator body; and a driving force-transmitting mechanism which converts the rotary driving force of the rotary driving source into the rectilinear motion which is transmitted to the slider.

Abstract: The invention relates to a rotation transmission device and a motor vehicle seat adjustment system comprising one such device. The inventive transmission device comprises a flexible shaft and a casing which houses the shaft therein. The aforementioned casing comprises a core consisting of a hollow cylinder having an inner diameter which is dimensioned such as to enable the rotation of the shaft inside said core. The core of the device comprises at least one bearing-forming zone which is obtained by means of plastic deformation, said zone comprising at least three parts, namely: two outer parts and one central part. The axes of the above-mentioned parts are essentially parallel to that of the core while the diameter of said parts is essentially equal to that of the core. Moreover, the outer parts are substantially coaxial and comprise an axis which is offset in relation to the axes of the central part and the core.

Abstract: An elevator system includes a roller arrangement and a belt for supporting an elevator car. The roller arrangement has two rollers with approximately parallel axes of rotation and structured circumferential surfaces engaging a complementary structured surface of the belt. The structured surfaces have alternating ribs and grooves. The belt is twisted about its longitudinal axis between the two rollers to keep the structured surfaces in contact and forms an under-looping for support of the elevator car.

Abstract: An actuator comprises a driving force-transmitting mechanism which includes a belt member running over a driving pulley and a driven pulley, and a guide mechanism which includes a plurality of balls which rolls along first ball-rolling grooves formed on a frame, and second ball-rolling grooves formed on a slider. The guide mechanism guides the slider when the slider is displaced along the frame.

Abstract: Apparatus comprising a pump or compressor operated by a pull-cord wound around a pulley (9), in which the pulley drives a shaft (11) which drives the pump or compressor, and the pulley is recoiled by means of a retractor type spring (32), torsion bar or elastic band. The retractor spring is mounted not both co-planar and co-axial with the pulley. The principal may be applied to reciprocating or rotary pumps or compressors, with compressible or incompressible fluid.

Abstract: A stationary member is fixed to a microscope. A movable member holds a sample and can move in a direction perpendicular to an optical axis of the microscope. A stepping motor moves the movable member. A rotation of the stepping motor is transmitted to the movable member by a power transmitter. An origin detector detects the movable member being positioned in an origin. A control unit controls the position of the movable member based on a signal from the origin detector and the number of driving pulses of the stepping motor. A power transmitter includes a reducer having a spur gear which reduces a speed of the rotation of the stepping motor, and an urging unit which applies a rotation force to the spur gear in one direction in a movement range of the movable member.

Abstract: A flexible composite with integral flights is provided and methods for making the same. The composite is made from, for example, silicone rubber, urethane rubber, polytetrafluoroethylene or other polymer. The composites are useful for making articles of manufacture, in particular, conveyor belts for use in high temperature food processing. The conveyor belts are an improvement over the prior art in that they prevent slippage of the articles conveyed, may be manufactured at low cost and are easy to clean.

Abstract: A mechanical apparatus used to convert a servo motor's rotational motion output into linear motion output is provided.

Abstract: A device for driving a gradient cable includes a guide tube at least partly surrounding at least a section of the gradient cable, a housing supporting the gradient cable in its longitudinal direction, a driving pinion meshingly engaging with a first portion of the gradient cable, and a first guide wheel supporting the gradient cable at a level with the first portion of the gradient cable.

Abstract: The invention relates to an electromechanical structure of an extendable electrical device comprising a body part (300) and a sleeve-like grip part (301). The smooth longitudinal movement between a retracted and extended position is effected by a clockspring in a spring barrel (302). A belt is wrapped around the barrel, and a slide part (306) is attached to the free end of the belt. When the device is retracted, the slide part with the belt slides along a longitudinal groove (304) made on at least one side of the body part until the slide part is interlocked. In response to pushing a releasing element, the interlocking is released, whereupon the belt is wrapped around the barrel and the body part slides smoothly to extended position.