US3802286A - Chain tensioning device - Google Patents

Chain tensioning device Download PDF

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Publication number
US3802286A
US3802286A US00335458A US33545873A US3802286A US 3802286 A US3802286 A US 3802286A US 00335458 A US00335458 A US 00335458A US 33545873 A US33545873 A US 33545873A US 3802286 A US3802286 A US 3802286A
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US
United States
Prior art keywords
guide element
plunger
cylinder
movement
retracted position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00335458A
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English (en)
Inventor
G Winklhofer
H Zollner
A Biedermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joh Winklhofer Beteiligungs GmbH and Co KG
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Joh Winklhofer and Soehne GmbH and Co KG
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Filing date
Publication date
Priority claimed from DE19722212818 external-priority patent/DE2212818C3/de
Application filed by Joh Winklhofer and Soehne GmbH and Co KG filed Critical Joh Winklhofer and Soehne GmbH and Co KG
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Publication of US3802286A publication Critical patent/US3802286A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0806—Compression coil springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0812—Fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0857—Screw mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0859—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0872—Sliding members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0891—Linear path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H7/0836—Means for varying tension of belts, ropes, or chains with vibration damping means of the fluid and restriction type, e.g. dashpot

Definitions

  • ABSTRACT i A chain tensioning device in which a plunger axially [73] Asslgnee' g wmflhofer & Sohn Kunststoff movable in a cylinder carries a chain engaging head ermany and is biased outward of the cylinder cavity by a com- [22] Filed: Feb. 26, 1973 pression spring.
  • This invention relates to tensioning devices for transmission. belts, chains, and like elongated, flexible, power transmitting elements, and particularly to an improvement in the tensioning device for the timing chain of an internal combustion engine disclosed in the German Pat. application No. 1,775,273, published on May 27, 1971.
  • the known device includes two telescopically engaged members, hereinafter referred to as a cylinder and a plunger, which are movable relative to each other inthe direction of their common axis, the plunger being biased outward of the cylinder cavity by a compression spring.
  • Two guide elements engaged for relative threaded movement about the common axis of the cylinder and the plunger are fixedly fastened to the plunger and to one of two ratchet elements respectively, the other ratchet element being fixedly fastened to the cylinder to. prevent relative threaded movement of the guide elements in a direction that would permit movement of the plunger inward of the cylinder cavity.
  • the device When the device is arranged on a suitable fixed support with the axis transverse to the direction of movement of the chain to be tensioned, the'tensioning head is held in resilient engagement with the chain by the compression spring, and is moved outward of the cylinder in steps corresponding to the spacing of the ratchet teeth as the chain stretches to keep the chain in tensioned conditions.
  • the chain becomes too long to permit proper operation even with the aid of the tensioning device, and must be replaced.
  • the tensioning device for cooperation with the new chain, must be restored to the original condition, that is, the plunger and the head must be retracted inward of the cylinder. This cannot be done in the known device without partly disassembling the same.
  • the object of the invention is an improvement in the known device which permits the engaging head of the device to be retracted for cooperation with a newly installed chain without removinganything from the device.
  • the invention provides a tensioning device for a chain or other elongated, flexible, power transmitting element which includes a cylinder arranged for mounting on a stationary support and a plunger received in the cylinder for axial movement inward of the cylinder cavity into a retracted position, and outward of the cavity away from the retracted position.
  • a chain engaging head is mounted on the plunger outside the cavity for joint axial movement.
  • plunger is resiliently biases away from the retracted position and is secured to a first guide element.
  • a second guide element is rotatable in the cylinder cavity and engages the first element for relative helical movement of the guide elements substantially about the cylinder axis, whereby the second guide element is rotated about the axis in one direction during the outward movement of the plunger.
  • a ratchet device on the second guide element limits inward movement of the plunger under axial pressure applied to the chain engaging head to a substantially constant maximum distance in all axial positions of the plunger spaced from the retracted position.
  • Operating means are accessible outside the cylinder cavity for manually turning the second guide element in a direction to move the plunger into its retracted position.
  • a manually releasable locking device permits the plunger to be locked in the retracted position.
  • FIG. 1 shows a chain tensioning device of the invention in side-elev ational section on its axis
  • FIG. 2 illustrates the device of FIG. 1 in bottom plan view
  • FIG. 4 is a sectional view of the device of FIG. 3 taken on the line IVIV;
  • FIG. 5 illustrates yet another tensioning device of the invention in a view corresponding to that of FIG. 1;
  • FIGS. 6, 7, and 9 show modified details for use in the device of FIG. 5;
  • FIG. 8 is a side-elevational, sectional view of yet another modification of the device of FIG. 5;
  • FIG. 10 illustrates a further tensioning device of the invention in section on the line X-X in FIG. 11;
  • FIG. 11 shows the device of FIG. 10 in section on the line XI-XI;
  • FIG. 12 is a view of an additional tensioning device of the invention in front-elevational section on its axis;
  • FIG. 13 illustrates the device of FIG. 12 in fragmentary section on the line XIII-XIII;
  • FIG. 14 shows the device of FIG. 12 in section on the line XIV-XIV.
  • a chain tensioning device for tensioning the timing chain of an internal combustion engine. It includes a cushion l of oil-resistant, synthetic rubber which engages the moving chain to be tensioned when the device is installed in its normal operating condition.
  • the cushion l is backed by a metal frame 51, and the chain engaging head formed by the cushion l and frame 51 is fixedly fastened to a plunger 2 having the approximate shape of an inverted, tall, cylindrical cup.
  • the plunger 2 is coaxially received in a cylinder 3 integrally cast with two mounting lugs 52 which permit the device to be installed on a stationary engine part, such as the cylinder block or the timing chain cover.
  • a guide spindle 4 having approximately one turn each of steeply pitched, dual threads is a strip of glassfiber reinforced plastic twisted about the common axis of the plunger 2 and cylinder 3. It engages a matingly threaded guide nut 53 which is a suitably shaped axial portionof an otherwise cylindrical tube 5 fixedly and coaxially fastened to the transverse top wall of the plunger 2 and depending therefrom.
  • the tube 5 partly envelops the spindle 4, and the tube 5 together with the inner, axial wall of the plunger 2 bounds an annular space in which an axial portion of a helical compression spring 6 is received.
  • the spring is axially confined between the aforementioned transverse wall of the plunger 2 and a crown wheel 7 fixedly and coaxially fastened to the end of the spindle 4 remote from the cushion 1.
  • the spring 6 normally holds the wheel 7 in conforming, locking engagement with a complementary, annular crown wheel 8 fixedly fastened to the bottom wall of the cylinder 3.
  • the wheels 7, 8 have each a crown of radial ribs or ratchet teeth closely similar in cross section to saw teeth so that the two wheels constitute a uni-directional ratchet coupling which permits relative angular displacement of the spindle 4 and the cylinder 3 in one direction under an applied torque sufficient to overcome the locking force of the spring 6.
  • the portion of the shaft 9 accessible outside the cylinder 3 has a slot 54 in an axial plane which permits the shaft 9 to be turned manually by means of an inserted tool or ket.
  • a split, springmetal washer 10 carrying two integral, diametrically opposite,radial locking arms 10' is secured on the exposed part of the shaft 9 against rotation by an integral projection 11 of the washer 10 which engages the slot 54.
  • washer 10 is axially spaced from the outer, radial end wall of the cylinder 3 a distance slightly greater than the engaged axial height of the teeth on the wheels 7, 8.
  • the rounded heads 12 of two rivets inserted in the bottom wall of the cylinder 3 abuttingly engage the resilient arms 10' and prevent counterclockwise rotation of the spindle 4 and the shaft 9 from the position shown in FIG. 2 under the pressure exerted by the spring 6 which tends to drive the plunger 2 out of the cylinder 3.
  • a nipple 55 normally is supplied with lubricating oil during operation of the tensioning device, and the oil is discharged through a duct 56 leading from the cavity of the plunger 2 to an orifice in the cushion 1. Restricted throttling passages in the nippe 55 and the duct 56 prevent sudden relative motion of the plunger 2 and the cylinder 3 when the device is filled with non-compressible oil, this dash-pot effect being analogous to that of a liquid-filled automotive shock absorber.
  • FIGS. 1 and 2 The apparatus of FIGS. 1 and 2 is operated as follows:
  • the cylinder 3 is mounted by means of the lugs 52 on an internal combustion engine (not shown) in the normally oil-filled compartment which houses the valve timing chain and the cooperating sprockets on the crankshaft and the camshaft of the engine.
  • a new timing chain, properly installed,' is spacedly adjacent the face of the cushion l which is directed obliquely upward in the view of FIG. 1.
  • Oil under pressure is fed to the timing chain compartment through the nipple 55, the interior cavity of the cylinder 3 and the plunger 2, and the duct 56, so that a film of fresh lubricant is maintained between the timing chain and the cushion 1, and oscillations of the plunger assembly are damped.
  • the oil is returned to a pump from the compartment in a conventional manner, not relevant to this invention. Flutter of the chain may move the cushion 1 inward of the cylinder 3 over a maximum axial distance corresponding to one tooth spacing of the wheels 7, 8 against the return pressure of the spring 6 in all positions of the plunger 2 except the illustrated fully retracted position.
  • the chain tensioning device When stretching of the chain can no longer be compensated for by the advancing cushion l, the chain needs to be replaced, and the chain tensioning device must be restored to its original, illustrated condition to permit removal of the old chain and installation of a new one.
  • a key such as a flat steel bar, a screwdriver, or the like, is inserted into the slot 54, and the shaft 9 is pushed inward of the cylinder 3 until the teeth of the wheel 7 clear those of the wheel 8, and the washer 1'0 abuts against the outer bottom face of the cylinder 3.
  • the plunger 2 may now be retracted by manually turning the shaft 9 in a direction which is clockwise, as viewed in FIG.
  • the manually applied force being sufficient to deflect the arms 10' as they move over the rivet heads 12 into the illustrated position in which the plunger 2 is axially locked against the force of the spring 6 until the arms 10' are again moved counterclockwise over the heads 12 to release the spring 6 after installation of the new timing chain.
  • the tensioning device of the invention remains in the fully assembled condition, and no loose parts can be dropped into the non-illustrated sump at the bottom of the timing chain compartment.
  • the two guide elements which connect the plunger 2 with a ratchet coupling in the apparatus illustrated in FIGS. 3 and 4 are a cylindrical sleeve 13 and a pin 14 respectively, the pin projecting from the plunger 2 into a groove or slot 13' in the sleeve 13.
  • the groove extends in one helix turn about the common axis of the sleeve 13, the plunger 2, and the cylinder 3.
  • the compression spring 6 is radially confined in the sleeve 13.
  • the operating shaft 15 which rotatably and axially slidably passes through the transverse end wall at the bottom end of the cylinder carries a radial flange 16 which limits axial movement of the shaft 15 inward of the cylinder cavity as described above with reference to the spring washer 10.
  • the ratchet coupling which may be disengaged by axial movement of the shaft 15 is constituted by an integral rim of teeth 17 on the aforementioned end wall of the cylinder 3 and a second, conforming rim 19 on another flange 18 attached to the shaft 15.
  • the set screws which fixedly attached the flanges l6, 18 to the shaft in a conventional manner have been omitted from the drawing.
  • flange 18 is fixedly fastened, as by soldering (not shown), to the lower, annular edge of the sleeve 13.
  • wall portions of the sleeve 13 bound a lateral or axial pocket at the lower end of the slot 13.
  • FIGS. 5 to 9 a flanged shaft 15 substantially identical with that described with reference to FIGS. 3 and 4 is fixedly fastened to a guide spindle 4 identical with that shown in FIG. 1 and cooperating with a guide nut on a tube 57 fixedly fastened to the plunger 2, the nut having been omitted from FIGS. 5 to 9 since its structure and operation will be adquately understood from FIG. 1 and the nut 54 shown therein.
  • FIGS. 5 to 9 particularly illustrate the locking devices which hold the plunger assembly including the plunger 2, the tube 57 and the chain-engaging head on the plunger in the retracted position of the plunger during installation of a new timing chain as described above.
  • the rubber cushion la on the frame 51 of-the chainengaging head illustrated in FIG. 5 has a hook-shaped, resilient lip portion 21 which conformingly engages a hook-shaped projection 22 of the cylinder 3' in the fully retracted position of the plunger assembly shown in FIG. 5.
  • the lip portion 21 is readily disengaged manually after installation of the chain to be tensioned so that the spring b can 6 can the cushion la axially into the chain-engaging position.
  • the cushion lb illustrated in FIG. 6 is dimensioned so as to expose a face of the frame 51 which is obliquely inclined toward the axis of the device in a direction away from the cylinder 3.
  • a spring clip 23 attached to the cylinder 3 engages the oblique face of the frame 51 in the fully retracted condition of the plunger assembly and may be disengaged either by direct manipulation of the clip 23, or by merely turning the shaft 15 with a force sufficient to slip the frame 51 out from under the clip 23.
  • FIGS. 1 and 2 employs a locking device based on this mode of operation. Others are shown in FIGS. 7 and 8.
  • a radial bore in the cylinder 3a shown in FIG. 7 is provided with a fixedly fastened, internally threaded sleeve 58 having a restricted radially inner orifice, and outwardly closed by a threadedly adjustable plug 59.
  • a helical compression spring 60 in the sleeve 58 biases a steel ball 24 outward of the restricted orifice of the sleeve 58 and into a conforming recess 61 of the flange 18 on the shaft 15.
  • the click stop arrangement constituted by the spring-loaded ball 24 can lock the plunger assembly of the apparatus of FIG. 7 in the retracted position, yet can readily be released by merely turning the shaft 15.
  • the apparatus of FIG. 8 has a rubber cushion 1c in its chain-engaging head which is merely illustrative of the wide variety of modifications that may be applied to the individual elements of the chain tensioning apparatus of the invention.
  • the plunger assembly of the device shown in FIG. 8 is held in the retracted position by means of a leaf spring 25 fixedly fastened in the cavity of the cylinder 3 to the transverse bottom wall of the latter.
  • One end portion 25 of the spring 25 is offset angularly from the remainder of the spring for frictional, braking engagement with the cylindrical outer circumference of the flange 18 on the shaft 15.
  • the locking device releasably locking the plunger assembly in the retracted position is interposed between the plunger 2b and cylinder 3b.
  • a bore in the cylinder 3b is provided with a click stop not significantly different from that described with reference to FIG. 7 and including a steel bearing ball 26 which is spring biased inward of a radial bore 27 of the plunger 2b.
  • the synthetic rubber cushion 1d of the tensioning apparatus illustrated in FIGS. 10 and 11 is a portion of a chain-engaging head otherwise constituted by an integral, trough-shaped part 62 of a tubular plunger 2".
  • the cushion is vulcanized to a brass liner 63 in the trough 62 which upwardly closes an axial bore of the plunger 2"0 and is formed with a throttling passage 64 communicating with the bore.
  • Two helical grooves 29 in the wall of the bore extend each in about one turn about the common axis of the plunger 2' and the cylinder 3" in which the plunger is axially movable.
  • the grooves 29 are slidably engaged by respective short, cylindrical pins 28 projecting in opposite diametrical directions from a plastic sleeve 30 coaxial with the plunger 2".
  • a helical compression spring 6' is axially interposed in the central bore of the sleeve 30 between the liner 63 and a bottom wall 32 of the sleeve 30 which projects radially and carries a rim of ratchet ribs engaging a corresponding rim 33 of ratchet ribs integral with the lower, transverse end wall of the cylinder 3".
  • An operating shaft 34 integrally injection-molded with the sleeve 30 and its bottom wall 32 is accessible outside the cylinder cavity as described with reference to the other tensioning devices of the invention, and carries a separately attached flange 65.
  • Wall portions of the plunger 2" in addition to the helical grooves 29, also bound a circumferential groove 31 which extends in a radial plane relative to the plunger axis immediately adjacent the liner 63.
  • the plunger 2" When the plunger 2" is in the illustrated, retracted, axial position, it may be turned by means of the shaft 34 to locate the pins 28 in the groove 31, and thereby to lock the plunger 2" in the retracted position.
  • FIGS. 12 to 14 show a chain-tensioning device of the invention which is somewhat similar to that described above with referenceto FIGS. 3 and 4.
  • a guide pin 14 projects radially inward from the plunger 2 into a generally helical groove or slot 38 in a guide sleeve 35 coaxially received in the plunger 2 and enveloping the compression spring 6.
  • a lateral pocket 20' at the lower longitudinal end of the slot 38 permits the plunger 2 to be locked in its retracted position as described above withreference to FIGS. 3 and 4.
  • the edge of the sleeve 35 upwardly bounding the slot 38 is smoothly helical, and the lower edge carries projecting ratchet teeth 37.
  • An operating shaft 36 projects axially from the bottom wall of the cylinder 3 in which the plunger 2 is movably received.
  • the shaft 36 is axially secured by a radial flange 41 outside the cylinder cavity and an integral flange 42 in the cavity. Notches 39 in the flange 42 are engaged by lugs of the sleeve 35 which secure the sleeve against axial and angular movement relative to the shaft 36.
  • a sealing ring 40 in the bottom wall of the cylinder 3 extends about the shaft 36.
  • the guide pin 14' normally is held in contact with the smooth edge of the slot 38 by the spring 6, and the sleeve 35 is gradually turned as the plunger 2 follows the stretching timing chain.
  • the axial pressure exerted by the chain on the cushion 1 can push the plunger 2 inward of the cylinder 3 only until the pin 14' is received between two ratchet teeth 37, the shape of the teeth being such that no significant circumferentialforce is exerted by the pin 14 on the sleeve 35.
  • the slot 38 and the pin 14' thus combine the guide function of the elements 4, 53 in FIG. 1 with the uni-directional coupling function of the ratchettoothed crown wheels 7, 8.
  • Frictional engagements between the plunger and the cylinder has been found sufficient in the several embodiments of the invention to prevent rotation of the plunger about the common axis when the plunger is retracted by means of the operating shaft.
  • the angular position on the plunger assembly relative to the cylinder is secured by the chain engaging the rubber cushion l of the head.
  • an axial rib on the cylinder may engage a corresponding groove in the plunger or vice versa to prevent rotation of the plunger in the cylinder.
  • the problem, if any, is non-existent in a cylinder cavity and plunger of non-circular cross section, and such a device is specifically contemplated as a variation of the several cylindrical plungers illustrated.
  • plunger as employed in this specification and the attached claims does not exclude a suitably shaped piston combined with a piston rod projecting axially from the cylinder cavity and carrying the chainengaging head.
  • a tensioning device for an elongated, flexible, power transmitting element comprising, in combination:
  • a cylinder member having an axis and defining a cavity therein;
  • a plunger member received in said cylinder member for axial movement inward of said cavity into a retracted position, and outward of said cavity away from said retracted position;
  • a second guide element rotatable in said cavity about said axis and engaging said first guide element for relative helical movement of said guide elements, whereby said second guide element is rotated about said axis in one direction during said outward movement of said plunger member;
  • ratchet means on said second guide element for limiting inward movement of said plunger member under axial pressure applied to said head to a substantially constant maximum distance in all axial positions of said plunger member spaced from said retracted position;
  • said ratchet means include a uni-directional coupling engageable to secure said second guide element to said cylinder member against relative angular movement in said opposite direction while permitting said angular movement in said one direction.
  • said operating means include a shaft member extending axially outward of said cavity in a direction away from said head, said shaft member being fixedly fastened to said second guide element.
  • said locking means include a resilient arm projecting from said shaft member radially relative to said axis, and abutment means on said cylinder member engaging said arm and thereby limiting angular movement of said second guide element under the force of said yieldably resilient means, said arm being sufficiently resilient to permit deflection of the same when said shaft member is being turned manually.
  • said second guide element is formed with a helical, elongated groove, and said first guide element engages said groove for longitudinal movement therein, a portion of said second guide element bounding a laterally enlarged pocket communicating with one longitudinally terminal portion of said groove, said portion of said second guide element jointly with said first guide element constituting said locking means, said first guide element being received in said pocket when said plunger member is locked in said retracted position, and being released from said pocket by movement of said shaft member axially inward of said cavity.
  • said locking means include a locking member, said cylinder member and said head constituting a pair of cooperating elements, said locking member being mounted on one of said cooperating elements, essentially consisting of reslient material, and lockingly engaging the other cooperating element under the resilient force thereof in said retracted position of said plunger member.
  • said second guide element is formed with a helical, elongated groove, and said first guide element engages said groove for longitudinal movement therein, respective edge portions of said second guide element laterally bounding said groove, said ratchet means including a plurality of ratchet teeth on the edge portion bounding said groove in an axial direction away from saidhead, said ratchet teeth projecting into said groove and being spaced in the direction of groove elongation for receiving said first guide element therebetween during said inward movement of said plunger member under said axial pressure.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
US00335458A 1972-03-16 1973-02-26 Chain tensioning device Expired - Lifetime US3802286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722212818 DE2212818C3 (de) 1972-03-16 Spanner für das Zugmittel eines U mschlingu ngsgetriebes

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US3802286A true US3802286A (en) 1974-04-09

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US (1) US3802286A (ja)
JP (1) JPS493059A (ja)
FR (1) FR2175750B1 (ja)
GB (1) GB1422727A (ja)
IT (1) IT976570B (ja)

Cited By (45)

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Publication number Priority date Publication date Assignee Title
US4030373A (en) * 1975-11-20 1977-06-21 B-5 Associates Of Stamford, Connecticut Variable speed drive for a bicycle
US4371360A (en) * 1979-10-12 1983-02-01 Nhk Spring Co., Ltd. Locking mechanism in tension providing device
US4411638A (en) * 1981-08-27 1983-10-25 Dayco Corporation Belt tensioner and method of making the same
US4413982A (en) * 1981-09-11 1983-11-08 Dayco Corporation Belt tensioner, part therefor and methods of making the same
US4500304A (en) * 1981-09-11 1985-02-19 Dayco Corporation Belt tensioner
US4509935A (en) * 1981-08-27 1985-04-09 Dayco Corporation Belt tensioner and method of making the same
US4615096A (en) * 1981-09-11 1986-10-07 Dayco Corporation Method of making a belt tensioner with a rotary fluid dampener
US4816008A (en) * 1987-12-31 1989-03-28 Hamlin Transmission Corporation Variable-ratio transmissions, separately and in bicycles
US4973289A (en) * 1988-12-07 1990-11-27 Hamlin Transmission Corporation Variable-ratio transmissions, separately and in bicycles
US5601505A (en) * 1994-09-12 1997-02-11 Borg-Warner Automotive, K.K. Hydraulic tensioner
EP0877180A2 (en) 1997-05-08 1998-11-11 Borg-Warner Automotive, Inc. Hydraulic tensioner with external rack and ratchet
US6088860A (en) * 1996-12-20 2000-07-18 Fiskars Inc. Pocket tool with removable jaws
US6120402A (en) * 1998-09-21 2000-09-19 Borgwarner Inc. Hydraulic tensioner with external rack having backlash restriction
US6128981A (en) * 1996-02-14 2000-10-10 Bondhus Corporation Folding hand tool set
US6139454A (en) * 1998-09-21 2000-10-31 Borgwarner Inc. Hydraulic tensioner with plastic cap check valve or vent
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US6490954B2 (en) 1994-07-29 2002-12-10 Allen-Pal Llc Tool handle for holding multiple tools of different sizes during use
US20050054467A1 (en) * 2003-09-10 2005-03-10 Van T. Le Tensioning rail applied by injection molding
US20070191161A1 (en) * 2006-02-14 2007-08-16 Dietmar Renner Display panel tensioner and assemblies thereof
US20080276765A1 (en) * 2007-05-10 2008-11-13 Johnson Ronald L Hand tool with multiple bit storage and a method for using the same
US20080318716A1 (en) * 2005-04-28 2008-12-25 Schaeffler Kg Tensioning Device Pertaining to a Traction Mechanism Drive
US20090011880A1 (en) * 2007-07-03 2009-01-08 Seiji Sato Auto-tensioner
CN100470086C (zh) * 2004-10-15 2009-03-18 莫尔塞技术欧洲有限公司 装有止回装置的张紧器和停用防转装置的方法
US20090183604A1 (en) * 2008-01-17 2009-07-23 Wagic, Inc., A California Corporation Universal ratcheting tool
US20090183609A1 (en) * 2008-01-17 2009-07-23 Wagic, Inc., A California Corporation Radial foldout tool
US20090266731A1 (en) * 2008-01-17 2009-10-29 Wagic, Inc. Tool handle for holding multiple tools of different sizes during use
USD623037S1 (en) 2008-01-17 2010-09-07 Wagic Radial foldout tool
US20110000025A1 (en) * 2008-01-17 2011-01-06 Wagic, Inc. Biaxial foldout tool with multiple tools on a side and a rotational stop
US20110000024A1 (en) * 2008-01-17 2011-01-06 Wagic, Inc. Radial foldout tool with multiple types of tools and bit storage
USD630918S1 (en) 2008-01-17 2011-01-18 Wagic, Inc. Universal ratcheting tool
US20110079113A1 (en) * 2009-10-05 2011-04-07 Wagic, Inc. Dual purpose flip-out and t handle
US20110079115A1 (en) * 2009-10-05 2011-04-07 Wagic, Inc. Handled ratcheting tool with a flip out handle
USD643273S1 (en) 2009-10-05 2011-08-16 Wagic, Inc. Ratcheting tool with a flip out handle
USD677552S1 (en) 2008-01-17 2013-03-12 Wagic, Inc. Radial foldout tool with multiple types of tools and bit storage
US8499667B2 (en) 2008-01-17 2013-08-06 WAGIC, Inc Tool holder
US20140106913A1 (en) * 2011-06-03 2014-04-17 Borgwarner Inc. Tensioner and shoe therefor
USD708036S1 (en) 2008-01-17 2014-07-01 Wagic, Inc. Biaxial foldout tool
USD723276S1 (en) 2013-03-15 2015-03-03 Wagic, Inc. Post lock tool holder for L-shaped wrenches
US9193058B2 (en) 2012-05-15 2015-11-24 Wagic, Inc. Adjustable tool handle for holding a tool during use
US9193062B2 (en) 2013-03-15 2015-11-24 Wagic, Inc. Post lock tool holder for L-shaped wrenches
US9387579B2 (en) 2012-05-15 2016-07-12 Wagic, Inc. Adjustable tool handle for holding a tool during use
US10723014B2 (en) 2012-05-15 2020-07-28 Wagic, Inc. Tool holder for holding multiple tools of different sizes

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DE3238331A1 (de) * 1982-10-15 1984-04-19 Joh. Winklhofer & Söhne, 8000 München Kettenspanner
JPS6145165A (ja) * 1984-07-30 1986-03-05 Daido Kogyo Co Ltd チエ−ンテンシヨナ−用プランジヤ−の製造方法
JPS6177697U (ja) * 1984-10-25 1986-05-24
DE3636918A1 (de) * 1986-10-30 1988-05-05 Schaeffler Waelzlager Kg Kettenspanner
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US6193622B1 (en) 1907-09-19 2001-02-27 Ontario Drive & Gear Limited Automatic chain tensioner
US4030373A (en) * 1975-11-20 1977-06-21 B-5 Associates Of Stamford, Connecticut Variable speed drive for a bicycle
US4371360A (en) * 1979-10-12 1983-02-01 Nhk Spring Co., Ltd. Locking mechanism in tension providing device
US4411638A (en) * 1981-08-27 1983-10-25 Dayco Corporation Belt tensioner and method of making the same
US4509935A (en) * 1981-08-27 1985-04-09 Dayco Corporation Belt tensioner and method of making the same
US4525153A (en) * 1981-08-27 1985-06-25 Dayco Corporation Belt tensioner and method of making the same
US4413982A (en) * 1981-09-11 1983-11-08 Dayco Corporation Belt tensioner, part therefor and methods of making the same
US4500304A (en) * 1981-09-11 1985-02-19 Dayco Corporation Belt tensioner
US4615096A (en) * 1981-09-11 1986-10-07 Dayco Corporation Method of making a belt tensioner with a rotary fluid dampener
US4816008A (en) * 1987-12-31 1989-03-28 Hamlin Transmission Corporation Variable-ratio transmissions, separately and in bicycles
US4973289A (en) * 1988-12-07 1990-11-27 Hamlin Transmission Corporation Variable-ratio transmissions, separately and in bicycles
US7281454B2 (en) 1994-07-29 2007-10-16 Allen-Pal Llc Tool handle for holding multiple tools of different sizes during use
US7788996B2 (en) 1994-07-29 2010-09-07 Allen-Pal Llc Tool handle for holding multiple tools of different sizes during use
US20070295171A1 (en) * 1994-07-29 2007-12-27 Johnson Kenneth R Tool handle for holding multiple tools of different sizes during use
US6490954B2 (en) 1994-07-29 2002-12-10 Allen-Pal Llc Tool handle for holding multiple tools of different sizes during use
US20050268752A1 (en) * 1994-07-29 2005-12-08 Johnson Kenneth R Tool handle for holding multiple tools of different sizes during use
US6941843B2 (en) 1994-07-29 2005-09-13 Allen-Pal Llc Tool handle for holding multiple tools of different sizes during use
US20040194588A1 (en) * 1994-07-29 2004-10-07 Johnson Kenneth R. Tool handle for holding multiple tools of different sizes during use
US6763744B2 (en) 1994-07-29 2004-07-20 Allen-Pal Llc Tool handle for holding multiple tools of different sizes during use
US5601505A (en) * 1994-09-12 1997-02-11 Borg-Warner Automotive, K.K. Hydraulic tensioner
US6128981A (en) * 1996-02-14 2000-10-10 Bondhus Corporation Folding hand tool set
US6305041B1 (en) 1996-12-20 2001-10-23 Alterra Holdings Corporation Pocket tool with removable jaws
US6088860A (en) * 1996-12-20 2000-07-18 Fiskars Inc. Pocket tool with removable jaws
EP0877180A2 (en) 1997-05-08 1998-11-11 Borg-Warner Automotive, Inc. Hydraulic tensioner with external rack and ratchet
US6165091A (en) * 1997-11-26 2000-12-26 Litens Automotive Partnership Rotary hydraulic automatic tensioner
US6244981B1 (en) 1998-09-21 2001-06-12 Borgwarner Inc. Hydraulic tensioner with pawl-style external rack
US6196939B1 (en) 1998-09-21 2001-03-06 Borgwarner Inc. Hydraulic tensioner with a hydraulically controlled rack
US6139454A (en) * 1998-09-21 2000-10-31 Borgwarner Inc. Hydraulic tensioner with plastic cap check valve or vent
US6120402A (en) * 1998-09-21 2000-09-19 Borgwarner Inc. Hydraulic tensioner with external rack having backlash restriction
US7473197B2 (en) * 2003-09-10 2009-01-06 Joh. Winklhofer & Söhne GmbH und Co. KG Tensioning rail applied by injection molding
US20050054467A1 (en) * 2003-09-10 2005-03-10 Van T. Le Tensioning rail applied by injection molding
CN100470086C (zh) * 2004-10-15 2009-03-18 莫尔塞技术欧洲有限公司 装有止回装置的张紧器和停用防转装置的方法
US8696501B2 (en) * 2005-04-28 2014-04-15 Schaeffler Technologies Gmbh & Co. Kg Tensioning device pertaining to a traction mechanism drive
US20080318716A1 (en) * 2005-04-28 2008-12-25 Schaeffler Kg Tensioning Device Pertaining to a Traction Mechanism Drive
US20100113198A1 (en) * 2005-04-28 2010-05-06 Schaeffler Kg Tensioning device pertaining to a traction mechanism drive
KR101277879B1 (ko) * 2005-04-28 2013-06-21 섀플러 홀딩 게엠베하 운트 코. 카게 트랙션 메카니즘 드라이브의 텐셔닝 장치
US8033041B2 (en) * 2006-02-14 2011-10-11 Du Toit Family Trust It 3452/1998 Display panel tensioner and assemblies thereof
US20070191161A1 (en) * 2006-02-14 2007-08-16 Dietmar Renner Display panel tensioner and assemblies thereof
US9289894B2 (en) 2007-05-10 2016-03-22 Wagic, Inc. Hand tool with multiple bit storage and a method for using the same
US8011277B2 (en) 2007-05-10 2011-09-06 Wagic, Inc. Hand tool with multiple bit storage and a method for using the same
US20080276765A1 (en) * 2007-05-10 2008-11-13 Johnson Ronald L Hand tool with multiple bit storage and a method for using the same
US20090011880A1 (en) * 2007-07-03 2009-01-08 Seiji Sato Auto-tensioner
US8888623B2 (en) * 2007-07-03 2014-11-18 Ntn Corporation Auto-tensioner
US20110000024A1 (en) * 2008-01-17 2011-01-06 Wagic, Inc. Radial foldout tool with multiple types of tools and bit storage
US8925429B2 (en) 2008-01-17 2015-01-06 Wagic, Inc. Radial foldout tool
US10442069B2 (en) 2008-01-17 2019-10-15 Wagic, Inc. Biaxial foldout tool with multiple tools on a side and a rotational stop
US7946203B2 (en) 2008-01-17 2011-05-24 Wagic, Inc. Tool handle for holding multiple tools of different sizes during use
US10434631B2 (en) 2008-01-17 2019-10-08 Wagic, Inc. Universal ratcheting tool
USD630918S1 (en) 2008-01-17 2011-01-18 Wagic, Inc. Universal ratcheting tool
US8033200B2 (en) 2008-01-17 2011-10-11 Wagic, Inc. Universal ratcheting tool
US20110000025A1 (en) * 2008-01-17 2011-01-06 Wagic, Inc. Biaxial foldout tool with multiple tools on a side and a rotational stop
US8336428B2 (en) 2008-01-17 2012-12-25 Wagic, Inc. Universal ratcheting tool
US8359954B2 (en) 2008-01-17 2013-01-29 Wagic, Inc. Radial foldout tool with multiple types of tools and bit storage
USD677552S1 (en) 2008-01-17 2013-03-12 Wagic, Inc. Radial foldout tool with multiple types of tools and bit storage
USD623037S1 (en) 2008-01-17 2010-09-07 Wagic Radial foldout tool
US8468916B2 (en) 2008-01-17 2013-06-25 Wagic, Inc. Biaxial foldout tool with multiple tools on a side and a rotational stop
US8499667B2 (en) 2008-01-17 2013-08-06 WAGIC, Inc Tool holder
US10322503B2 (en) 2008-01-17 2019-06-18 Wagic, Inc. Tool handle for holding multiple tools of different sizes during use
US8640574B2 (en) 2008-01-17 2014-02-04 Wagic, Inc. Radial foldout tool with multiple types of tools and bit storage
US20090266731A1 (en) * 2008-01-17 2009-10-29 Wagic, Inc. Tool handle for holding multiple tools of different sizes during use
US9701005B2 (en) 2008-01-17 2017-07-11 Wagic, Inc. Biaxial foldout tool with multiple tools on a side and a rotational stop
US8757033B2 (en) 2008-01-17 2014-06-24 Wagic, Inc. Universal ratcheting tool
USD708036S1 (en) 2008-01-17 2014-07-01 Wagic, Inc. Biaxial foldout tool
US20090183609A1 (en) * 2008-01-17 2009-07-23 Wagic, Inc., A California Corporation Radial foldout tool
US9604349B2 (en) 2008-01-17 2017-03-28 Wagic, Inc. Universal ratcheting tool
US9545707B2 (en) 2008-01-17 2017-01-17 Wagic, Inc. Tool handle for holding multiple tools of different sizes during use
US9505123B2 (en) 2008-01-17 2016-11-29 Wagic, Inc. Tool holder
US20090183604A1 (en) * 2008-01-17 2009-07-23 Wagic, Inc., A California Corporation Universal ratcheting tool
US10343273B2 (en) 2009-10-05 2019-07-09 Wagic, Inc. Dual purpose flip-out and T handle
US20110079113A1 (en) * 2009-10-05 2011-04-07 Wagic, Inc. Dual purpose flip-out and t handle
US20110079115A1 (en) * 2009-10-05 2011-04-07 Wagic, Inc. Handled ratcheting tool with a flip out handle
USD643273S1 (en) 2009-10-05 2011-08-16 Wagic, Inc. Ratcheting tool with a flip out handle
US9676083B2 (en) 2009-10-05 2017-06-13 Wagic, Inc. Dual purpose flip-out and T handle
US8621963B2 (en) 2009-10-05 2014-01-07 Wagic, Inc. Dual purpose flip-out and T handle
US9120208B2 (en) 2009-10-05 2015-09-01 WAGIC, Inc Handled ratcheting tool with a flip out handle
US20140106913A1 (en) * 2011-06-03 2014-04-17 Borgwarner Inc. Tensioner and shoe therefor
US9366322B2 (en) * 2011-06-03 2016-06-14 Borgwarner Inc. Tensioner and shoe therefor
US9193058B2 (en) 2012-05-15 2015-11-24 Wagic, Inc. Adjustable tool handle for holding a tool during use
US10207400B2 (en) 2012-05-15 2019-02-19 Wagic, Inc. Adjustable tool handle for holding a tool during use
US9387579B2 (en) 2012-05-15 2016-07-12 Wagic, Inc. Adjustable tool handle for holding a tool during use
US10723014B2 (en) 2012-05-15 2020-07-28 Wagic, Inc. Tool holder for holding multiple tools of different sizes
US10239197B2 (en) 2013-03-15 2019-03-26 Wagic, Inc. Post lock tool holder for L-shaped wrenches
USD723276S1 (en) 2013-03-15 2015-03-03 Wagic, Inc. Post lock tool holder for L-shaped wrenches
US9193062B2 (en) 2013-03-15 2015-11-24 Wagic, Inc. Post lock tool holder for L-shaped wrenches

Also Published As

Publication number Publication date
IT976570B (it) 1974-09-10
DE2212818B2 (de) 1976-04-01
DE2212818A1 (de) 1973-09-27
FR2175750A1 (ja) 1973-10-26
GB1422727A (en) 1976-01-28
JPS493059A (ja) 1974-01-11
FR2175750B1 (ja) 1974-02-01

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