Abstract: The object of the invention is a method for modernizing an elevator, and a traction sheave elevator, which elevator comprises at least an elevator car and a traction sheave that moves the elevator car by means of elevator ropes, the rim of which traction sheave comprises one or more rope grooves. In connection with modernization a traction sheave is installed as the traction sheave of the elevator, the rope grooves of which traction sheave comprise a material, the frictive traction achieved by which is greater than the frictive traction between the parent material of the metallic traction sheave and the elevator ropes.

Abstract: The object of the invention is a traction sheave elevator and a rope that contains metal as a load-bearing material, such as the suspension rope of an elevator, which rope comprises at least one or more strands laid from metal wires and which rope is lubricated with a lubricant. Another object is the use of the aforementioned lubricant for lubricating the rope. The lubricant comprises at least oil and thickener, which thickener in the lubricant comprises at least 10% or more of the mass of the lubricant.

Abstract: An elevator system (20) includes multiple elevator cars (22, 32) within a hoistway (26). Counterweights (24, 34) are associated with the respective elevator cars (22, 32) by load bearing members (40, 50). In some examples, different roping ratios are used for the load bearing members (40, 50). In some examples, the lengths of the load bearing members (40, 50) are selected to allow contact between the counterweights (24, 34) within the hoistway (26) and prevent contact between the elevator cars (22, 32). The difference in car and counterweight separation distances is greater than a stroke of a counterweight buffer plus an expected dynamic jump of the elevator cars. A disclosed example includes passages (80) through a portion of at least one of the elevator cars (22) for accommodating the load bearing member (50) of another elevator car (32) located beneath the elevator car (22) with the passages (80).

Abstract: The invention concerns a lift having a drive unit. The invention further concerns a wind power installation having a lift. To reduce the costs of the lift and thus make the lift economically more attractive the lift of the kind set forth in this specification is characterized by a cupboard used as the lift car. In that respect the invention is based on the realization that a cupboard in its basic structure with bottom, side walls and a door does not differ from a lift car produced specifically for a lift. Naturally there are differences, for example in suspension and operation of the door, but those differences can be removed insofar as they are an obstacle to use of a cupboard as a lift car so that the complication and expenditure overall is always still less than the complication and expenditure for a lift car constructed specifically for the lift.

Abstract: A single support device (30) is adapted to support and secure a machine (34) at least one sheave (38) and a plurality of termination members (44, 46). The single support device (30) is conveniently installed within a hoistway (26) or within a machine room (90). The machine (34) and sheave (38) may be premounted to the support device (30) and the entire assembly can be lowered into position by crane (300).

Abstract: An elevator system has a suspension member for supporting and/or moving an elevator car and being guided and driven by a traction sheave of a drive unit. The suspension member is a cord or rope that includes a body made of a polymer and at least one tension member made of wires extending in the longitudinal direction of and embedded in the body. A thickest wire in the tension member has a bending stress ?b in a range from 350 N/mm2 to 900 N/mm2 when bending the tension member about a minimum bending radius r, and wherein the bending stress is a function of the elastic modulus E and the diameter ? of the thickest wire, according to the equation ?b=(?*E)/2r, wherein the suspension member is run about a pulley having a minimum diameter D corresponding to no more than two times the minimum bending radius (D?2r).

Abstract: A transmission belt for driving and/or supporting an elevator car has a longitudinally extending body including an area tensile layer reinforced by chemical fibers. The belt can have a flat friction layer or a friction layer including alternating longitudinally extending wedge-shaped ribs and grooves. Transverse grooves can be formed across the width of the longitudinally grooved friction layer.

Abstract: A machineroom-less elevator in which a counterweight is vertically moved behind a cage, with the cage and the counterweight being suspended in a jig back manner through a first and second diverting sheaves. In this machineroom-less elevator, a sufficiently large vertical stroke of the counterweight can be secured, while a durability of a hoist rope is improved. In addition, since no tensile difference is generated in respective parts of the hoist rope, vertical vibrations of the cage are prevented when the cage restarts a vertical movement. A traction sheave is disposed on one of right and left sidewalls of an elevator shaft. A first diverting sheave is disposed below and sufficiently apart from the traction sheave, and a second diverting sheave is disposed on a top of a rear wall of the elevator shaft.

Abstract: An elevator comprising a cabin (1), vertical guide elements (2, 3) for guiding said cabin, at least one suspension or support belt (4, 5), groups of pulleys associated to the guide elements and the cabin; each of said groups of pulleys is composed of at least two coplanar pulleys arranged on parallel axles and vertically one above the other; each of the groups of pulleys comprises pulleys having a diameter decreasing from a pulley of a maximum diameter to a pulley of a minimum diameter. Preferred embodiments of the belts having one or two concave or convex surfaces and internal reinforcing wires are disclosed.

Abstract: A transmission belt for driving and/or supporting an elevator car has a longitudinally extending body including an area tensile layer reinforced by chemical fibers. The belt can have a flat friction layer or a friction layer including alternating longitudinally extending wedge-shaped ribs and grooves. Transverse grooves can be formed across the width of the longitudinally grooved friction layer.

Abstract: When main power to an elevator system 10 is lost, an automatic rescue operation is performed using power from a backup power source 46. A rescue run for an elevator stopped between floors is initiated by lifting a brake 28 and allowing the elevator car 12 to move by gravity. If the car 12 moves as a result of a weight imbalance between the car 12 and a counterweight 14, operation of the hoist motor 24 is synchronized with sensed movement of the car 12 to generate electricity. If weight is balanced so that the car 12 does not move, backup power is supplied to the hoist motor 24 to apply a motor torque to drive the car 12 in a selected direction during the rescue run.

Abstract: An elevator, preferably an elevator without counterweight, comprising a number of diverting pulleys in the upper part of an elevator shaft or equivalent, a number of diverting pulleys in the lower part of the elevator shaft and a number of diverting pulleys on an elevator car, is installed in such manner that at least some of the diverting pulleys for the upper part are rigged in the lower part of the elevator shaft and at least some of the diverting pulleys from which the passage of the ropes is directed upwards are rigged at the same time. The diverting pulleys for the upper part thus rigged are raised in the rigged state to the upper part of the elevator shaft or equivalent and mounted in place.

Abstract: The object of the invention is a traction sheave elevator and a rope (3) that contains metal as a load-bearing material, such as the suspension rope of an elevator, which rope comprises at least one or more strands (7) laid from metal wires (9) and which rope (3) is lubricated with a lubricant (8). Another object is the use of the aforementioned lubricant for lubricating the rope (3). The lubricant (8) comprises at least oil and thickener, which thickener in the lubricant (8) comprises at least 10% or more of the mass of the lubricant (8).

Abstract: A method for installing an elevator may include stopping an elevator car or partially completed elevator car in the upper part of an elevator shaft; rigging first portions of hoisting ropes between the car and diverting pulleys in the upper part of the shaft so that the first portions pass via the diverting pulleys in the upper part of the shaft and first diverting pulleys on the car; moving the car to the lower part of the shaft, while supplying ropes from rope reels to the first portions between the car and the diverting pulleys in the upper part of the shaft; and rigging second portions of the hoisting ropes between the car and diverting pulleys in the lower part of the shaft so that the second portions pass via the diverting pulleys in the lower part of the shaft and second diverting pulleys on the car.

Abstract: The object is achieved, according to the invention, in that the traction device (208) is equipped as a pulley block (209) with two or more, in particular with four, deflecting pulleys (206, 212, 214, 219), the axes of which are arranged one below the other on an approximately vertically running plane, at least one deflecting pulley (206) being mounted in the elevator well or on the well carcass (102) above the elevator installation (103), a further deflecting pulley (219) being mounted below the elevator installation (103) in the elevator well or on the well carcass (102), and one or more, in particular two, deflecting pulleys (212, 214) being mounted on a side element (202) of the load suspension means, in particular the travel platform (200).

Abstract: An elevator system includes a car with an empty weight MK, which car can move a rated load MLmax, a counterweight, which is coupled with the car by a support device so that it rises when the car lowers and lowers when the car rises, as well as a drive device which can apply a maximum traction force MFmax to the support means. According to the present invention the drive device is selected in such a manner that the maximum traction force MFmax is at least greater than half the rated load MLmax (MFmax>0.5×MLmax) and the weight MG of the counterweight is optimized in such a manner that it is substantially equal to the empty weight MK and the difference between the rated load MLmax of the car and the maximum traction force MFmax of the selected drive device (MG?MK+(MLmax?MFmax)).

Abstract: Method for constructing an elevator, more particularly an elevator that is used during the construction-time of the building, in which method the range of movement in the elevator hoistway of the elevator car of the elevator is changed in steps to extend higher in the elevator hoistway with stepped lifts of the supporting platform of the elevator car, and in which method the supporting platform is lifted higher in the elevator hoistway with hoisting means, and the support force needed for the lift is taken from the building via a support structure. In the method the supporting platform is moved in the longitudinal direction of the elevator hoistway while being supported on a support structure that is supported immovably on the building such that the point for taking support from the support structure moves upwards in connection with the lifting of the supporting platform.

Abstract: An elevator comprises an elevator car, a counterweight, a drive and a support, wherein the support couples the elevator car and the counterweight with the drive so that the elevator car and the counterweight are movable in opposite vertical directions by the drive, and wherein the support has a support section at the car side and a support section at the counterweight side. The elevator further comprises a sensor line which is coupled to both the elevator car and the counterweight and which is guided so that in the case of movement of the elevator car and the counterweight in opposite directions it generally remains tensioned by a substantially constant tension stress. The elevator further comprises a sensor which is coupled with the sensor line so that slackening of a support section is detectable by the sensor.

Abstract: An exemplary brake device includes a brake element configured to apply a braking force to resist rotation of an associated component. A mounting member is configured to mount the brake device to a stationary surface. The mounting member is at least partially moveable relative to the stationary surface responsive to a torque on the brake device. A sensor provides an indication of a force associated with any movement of the mounting member relative to the stationary surface responsive to the torque.

Abstract: An elevator may include an elevator car, a counterweight, a set of hoisting ropes, and one or more rope pulleys. The car and counterweight may be suspended on the hoisting ropes. At least one rope pulley may include a solid surface including a plurality of rope grooves configured to receive at least one hoisting rope. Each rope groove may generally conform to a semi-circular shape and may include a groove bottom and sides. The at least one rope pulley may include a coating adhesively bonded to it. The coating may directly contact the at least one hoisting rope. A coating thickness may be less than or equal to about 3 mm. At the groove bottom of each rope groove, the coating thickness may be substantially less than half a thickness of the at least one hoisting rope. The coating may cover the groove bottom and sides of each rope groove.

Abstract: An elevator and a locking apparatus for preventing rotational movement of the traction sheave of the elevator are provided. The elevator includes at least a hoisting machine provided with a traction sheave, a frame and at least one brake. A holding device is disposed in connection with the hoisting machine, which holding device is arranged to prevent rotational movement of the traction sheave.

Abstract: An elevator system has at least one elevator car and at least one counterweight which are displaced in opposing directions along at least one guide track in an elevator shaft by a supporting and driving apparatus that is guided by a drive pulley of a drive. The supporting and driving apparatus is fastened directly to the elevator car eccentrically with respect to a center of gravity of the elevator car so that a tilting or load moment results thereby, wherein the tilting or load moment can be compensated by a compensation device.

Abstract: An elevator installation includes at least one elevator car and at least one counterweight, wherein the at least one elevator car is capable of being moved on guide rails in an elevator shaft by a drive with a driving pulley and with a supporting and propulsion apparatus. The at least one counterweight is formed with a hollow body enclosing a filling. In the event of a freefall, the hollow body is destroyed allowing the filling to emerge.

Abstract: Elevator, preferably a passenger elevator, which comprises an elevator car, and at least one hoisting rope for moving and supporting the elevator car, a traction sheave that acts on the hoisting rope, and a power source for rotating the traction sheave. The counterweight of the elevator comprises a brake for decelerating and/or preventing at least upward movement of the counterweight.

Abstract: An exemplary elevator system comprises a machine support (30) including a first portion (32) situated in a generally horizontal position at least partially within a hoistway (24). A second portion (34) is oriented generally perpendicular to the first portion. The second portion has one end supported by a support surface (52) adjacent the hoistway such that a portion of a load of the machine support is transferred to the support surface. One end of the first portion (32) is supported by the second portion (34) and another end of the first portion is supported by a structural member at least partially in the hoistway such that a remainder of the load of the machine support is transferred to the structural member.

Abstract: An elevator may include an elevator car, counterweight, set of hoisting ropes, and one or more rope pulleys. The elevator car and counterweight may be suspended on the set of hoisting ropes. The one or more rope pulleys may be provided with one or more rope grooves. Each rope groove may have a groove bottom and groove sides. At least one rope pulley may have a coating adhesively bonded to it. At the groove bottom, a thickness of the coating may be at most about 3 mm. At the groove bottom, the thickness of the coating may be substantially less than half a thickness of the at least one hoisting rope running in the one or more rope grooves. At the groove sides, the thickness of the coating may be at most about 3 mm. The coating may be thicker at the groove bottom than at the groove sides.

Abstract: According to an emergency brake device for an elevator, a brake body is capable of coming into and out of contact with an outer periphery of a sheave which is rotatable, and is capable of being displaced to a rotation direction of the sheave while maintaining a contact with the outer periphery of the sheave. Further, the brake body is arranged between the sheave and a gripper metal. The gripper metal includes an inclined portion which is caused to incline with respect to the outer periphery of the sheave. When the brake body is displaced in the rotation direction of the sheave, the brake body is meshed between the outer periphery of the sheave and the inclined portion. To the brake body, a connecting portion capable of being displaced with respect to the sheave is connected. The connecting body is displaced in a direction in which the brake body comes into and out of contact with the outer periphery of the sheave by a brake drive device.

Abstract: The invention relates to an elevator system having an elevator car, a load carrier for holding and/or moving the elevator car, and a detector device for detecting a condition of the load carrier, the detector device having an ultrasonic emitter for generating and coupling ultrasonic waves into the load carrier and for generating ultrasonic waves in the load carrier, and an ultrasonic receiver for detecting ultrasonic waves of the load carrier.

Abstract: The present invention discloses a drive system for theatrical rigging, comprising a drive rope and a drive pulley. The drive rope has a fiber or cable core, surrounded by a plastic jacket. Formed on or in the surface of the drive rope are traction features that engage corresponding grooves in the drive pulley.

Abstract: An elevator load bearing assembly (20) includes a plurality of cords (22) within a jacket (24). The jacket has a plurality of grooves (32, 34, 36, 38 40) spaced along the length of the belt assembly. Each groove has a plurality of portions (50, 52, 54, 56) aligned at an oblique angle (A, B) relative to a longitudinal axis (48) of the belt (20). In one example, the grooves are separated such that there is no longitudinal overlap between adjacent grooves. In another example, transitions (60, 64) between the obliquely aligned portions are at different longitudinal positions on the belt. Another example includes a combination of the different longitudinal positions and the non-overlapping groove placement.

Abstract: An exemplary method of retrofitting a brake onto an elevator machine that was previously installed in an elevator system includes selecting a surface of the elevator machine that rotates as a sheave of the machine rotates. A braking surface is provided on the selected surface. At least one brake member is installed in a position to selectively engage the braking surface.

Abstract: A fixing point arranged at a guide rail consists substantially of a slide, which is movable along the guide rail and which is guided by guide shoes at the free limb of the guide rail and carries a yoke. A bracket, at which a damping element is supported, is arranged at the guide rail. The end of a belt is held by a connecting element, which in turn is suspended by a tie rod and nuts at the yoke. In the case of an emergency stop situation in which the brake of the drive unit retards the elevator car to standstill, the retardation forces arising in that case are transmitted by belt, connecting element and tie rod to the yoke, wherein the retardation forces produce a displacement of the slide downwardly into the spring-stressed position against the damping capability of the damping element.

Abstract: In a method in the use of a construction-time elevator, at least two lifts are performed. In each of the lifts, the supporting platform is lifted higher in the elevator hoistway with the hoisting device supported by the support structure so as to extend the operating range of the elevator car to reach higher in the elevator hoistway. A second support structure and a second hoisting device, which are above the support structure, are used between the lifts of the supporting platform, for moving the working platform in the elevator hoistway under construction between the second support structure and the support structure, and for lifting the support structure upwards in the elevator hoistway.

Abstract: An elevator includes a pair of vertical shafts, each of which have a vertical first rail and a vertical second rail; a car engaged with the first rails of the shafts that the car moves along the shafts; a counterweight engaged with the second rails of the shafts that the counterweight moves along the shafts; and a driving unit having ropes with opposite ends connected to the car and the counterweight to drive the car to move. The elevator of the present invention only has the shafts to guide both of the car and the counterweight that there may be more space for the car to provide a great capacity in the same hoistway.

Abstract: A flat belt (2), which is made of elastomeric material (46a, 46b), is made up of a first partial belt (2a) and a second partial belt (2b). The first partial belt (2a) is reinforced with a reinforcement layer (4) made up of cords. A layer separation which is to be feared theoretically is to be reliably avoided and the bonding of the belt material to the reinforcement layer (4) is to be optimized. The first belt part (2a) is provided with slots (44) with the aid of mold drum winding-projections (42); the second belt part (2b) defines a filling of the slots (44) of the first belt part (2a). Preferably, the reinforcement layer (4) is positioned centrally in the neutral bending plane of the finished flat belt (2). The first belt part (2a) and the second belt part (2b) can be made of different elastomeric materials (46a, 46b). Also, at least one of the two surfaces of the belt (2) can be coated and/or provided with a longitudinal profile or transverse profile.

Abstract: An aircraft elevator system includes a fixed frame, a floating frame coupled to the fixed frame, and a cabin coupled to the floating frame. The floating frame can move with respect to the fixed frame and the cabin can move with respect to the floating frame. The system can include an actuating system operating at least one pulley system to move the cabin between upper and lower positions, which respectively can be inside and outside the aircraft. In some embodiments, the system includes a support assembly that moderates or eliminates load transfer between the system and an aircraft upper deck floor structure. In some embodiments, the cabin includes a ramp configured to deploy when approaching the lower position and to retract to a stowed position when the cabin moves from the lower position toward the upper position. The ramp can include a sensor to control cabin movement.

Abstract: The battery counterweighted elevator is adapted for rack and pinion or cable traction elevators. The elevator uses electrical power from a solar cell array to charge or recharge storage batteries, which, in turn, provide the electrical power to drive the elevator. The storage batteries serve as counterweights for at least a substantial portion of the weight of the elevator car, and travel up and down opposite the car. A traveling cable connects the elevator car with the batteries in the counterweight in the case of the rack and pinion elevator, with the cable providing power to the drive motor situated with the car and also providing control of the system from the car. The cable traction elevator has a traveling control cable extending to a fixed junction box, with power supplied from the batteries to the junction box and thence to the fixed motor at the top of the hoistway.

Abstract: An elevator system includes a hoistway defined by a surrounding structure. An elevator car and counterweight are located in the hoistway, and a drive motor is located between the elevator car and a sidewall of the hoistway. The drive motor drivingly couples and suspends the elevator car and counterweight via at least one flat rope or belt.

Abstract: A hoisting device rope has a width larger than a thickness thereof in a transverse direction of the rope. The rope includes a load-bearing part made of a composite material, said composite material comprising non-metallic reinforcing fibers, which include carbon fiber or glass fiber, in a polymer matrix. An elevator includes a drive sheave, an elevator car and a rope system for moving the elevator car by means of the drive sheave. The rope system includes at least one rope that has a width that is larger than a thickness thereof in a transverse direction of the rope. The rope includes a load-bearing part made of a composite material. The composite material includes reinforcing fibers in a polymer matrix.

Abstract: An exemplary method of controlling elevator car position includes determining that an elevator car required re-leveling. Elevator car dynamics information associated with a current position of the elevator car is determined. A gain for controlling operation of a motor responsible for moving the elevator car for the re-leveling is adjusted based on the determined elevator car dynamics information.

Abstract: An elevator drive for driving and detaining an elevator car includes a traction wheel transmitting a driving or detaining force to an elevator car, a motor driving the traction wheel, a braking arrangement for detaining the traction wheel, and a drive shaft connecting the traction wheel, the motor and the braking arrangement. The braking arrangement contains at least two braking devices with the traction wheel arranged between to divide the braking torques transmitted by the traction wheel to the braking devices. Symmetrical division of the braking devices on either side of the traction wheel reduces by half the torque transmitted in the drive shaft. A risk of failure or breakage of the drive shaft is thereby significantly reduced and during a failure of the drive shaft, the braking function continues since the braking devices are distributed on both sides of the traction wheel.

Abstract: An elevator includes a car, a counterweight, a suspension working together with the car and the counterweight, and a wheel at least partially wound around by the suspension, wherein the suspension comprises a tie beam arrangement made of two tie beams and a shell encasing the tie beam arrangement, said shell comprising a longitudinal structure in an area of an outer surface partially winding around the wheel, and wherein the ratio of the width of the suspension to the height thereof is greater than one and less than or equal to three. The wheel comprises a groove for guiding the suspension on the sides, in which the suspension is at least partially received, and the groove floor thereof being formed flat. The shell is coated, at least in areas, on the outer surface thereof, wherein the coating optionally has a friction-reducing, friction-increasing, and/or wear-reducing effect.

Abstract: An elevating mechanism includes a cage, a connecting element, a balancing weight body, a sheave and a power output unit. The cage includes an outer box and an inner box. The outer box for containing a fluid has an inlet and an outlet. The inlet is for the fluid flowing into the outer box. The outlet is for the fluid flowing out of the outer box. The inner box is placed inside the outer box for containing a loading body, and suspended in the fluid. The connecting element is wound around the sheave. The power output unit is for driving the sheave. One end of the connecting element is connected to the outer box, and the other end connected to the balancing weight body. The weight of the balancing weight body is equal to the total weight of the outer box, the fluid, the inner box and the loading body.

Abstract: A modular drive for an elevator installation and a method of converting and fastening the drive in the elevator installation includes combining the main drive components such as a drive device, a brake device and a drive pulley into a drive module. Connecting parts for fastening the drive within an elevator shaft or in an engine space, or for adjusting a support means spacing, are mounted on the drive as required.

Abstract: Elevator, preferably an elevator without machine room. In the elevator, a hoisting machine engages a set of hoisting ropes by means of a traction sheave. The set of hoisting ropes comprises hoisting ropes of substantially circular cross-section. The hoisting ropes support a counterweight and an elevator car moving on their respective tracks. The hoisting rope has a thickness below 8 mm and/or the diameter of the traction sheave is smaller than 320 mm. The contact angle between the hoisting rope or hoisting ropes and the traction sheave is larger than 180°.

Abstract: Elevator, which comprises an elevator car, at least one traction sheave, at least two motors for rotating one or more traction sheaves, an elevator shaft or similar, a machine room or similar space, and hoisting roping. The elevator comprises a first motor in the machine room or similar, which is on a first level in the vertical direction, and a second motor, which is on a second level in the vertical direction, which second level is essentially higher in the vertical direction than the first level.

Abstract: The invention relates to an elevator installation and a method for mounting a drive unit of an elevator installation. The elevator installation comprises a car and a counterweight in a shaft and a drive unit mounted on a crossbeam or the shaft roof. The drive unit has two spaced-apart drive zones. The drive zones are in that case integrally integrated in the drive shaft and directly machined therein.

Abstract: The invention relates to a lift system wherein a drive unit (2) drives, by means of a driving disk (4.1), a flat belt-type carrier means (12.1, 12.2) which carries the lift cage (3). Said flat belt-type carrier means comprises several ribs (20.1, 20.2) which extend in a parallel manner in a longitudinal direction of the carrier means on a bearing surface which is orientated towards the driving disk (4.1) and each rib comprises at least two traction carriers (22) which are orientated in a longitudinal direction of the carrier means. The whole cross-sectional surface of all the traction carriers (22) is at least 25% of the cross-section surface of the carrier means.

Abstract: A method of controlling noise noticeable within an elevator car (22) includes intentionally introducing noise into the elevator car (22) at a noise level that depends on the position of the car within a hoistway (24). A disclosed example includes using existing elevator system components for generating compensating noise at different levels corresponding to different positions of the car within the hoistway. One disclosed example includes increasing introduced noise as the car descends further away from a machine responsible for moving the car. The introduced noise reduces or eliminates changes in noticeable noise within the elevator car as the car moves relative to the machine. The disclosed examples have particular usefulness in machine roomless elevator systems although they are not necessarily limited to such systems.

Abstract: An elevator system design incorporates a belt having a jacket coating a plurality of elongate load bearing members such as steel cords. The jacket includes a plurality of spaced grooves on at least one side of the belt. The width of the grooves and the size of at least the drive sheave in the system are selected so that a ratio of the groove width to the sheave diameter is within a selected range. In one example, the ratio preferably is less than about 0.05. The grooves also preferably include a fillet at the edges of the grooves where the grooves meet with the sheave-engaging surface on the belt jacket.