US2139007A - Hand brake - Google Patents

Description

Dems, 1938.

w. M. DwYER HAND BRAKE 2 Sheets-Sheet l Film1` March 8, 1957 iw; M. DWYER Dec. 6, 1938.

HAND BRAKE Filed March s, 1937 2 yshees-Shee'c'z Patented Dec. 6, 1938 UNITED STATES PATENT OFFICE HAND BRAKE Delaware Application March 8, 1937, Serial No. 129,680

18 Claims.

This invention relates to improvements in hand brakes for cars.

One object of the invention is to provide a simple and eiiicient hand` operated brake mechanism forrailway cars wherein the power applied to the hand operated means oi the brake mechanism is lgreatly multiplied in being transmitted to the brakemeans proper of the car to obtain relatively high braking power for more eiectively controlling the movements of the car.

A further object of the invention is to provide a hand brake mechanism of the handle lever operated type including a chain winding drum actuated by the Vhandle lever, wherein the handle lever is operatively connected to the drum by power multiplying means whereby the applied braking force exerted through rotation of the drum is materially increased over the force produced by the lever-action of the operating handle.

A more specific object ofthe invention is to provide ahand brakemechanism including a chain `winding drum, a swingable operating handle lever, a power multiplying means for transmitting movement from the handle lever to the drum comprising an oscillatory member mounted for swinging movement about the axis of rotation ofthe drum and having intermittent grip connection with the drum to rotate the latter step by step, an-d a fulcrum support on which the lever is adapted -to rock, the lever being pivotally connected to the oscillatory member to provide relatively long and short arms extending from the pivot thereof, the short arm being rockable on said iulcrum and the long arm forming the operating handle member byv which the lever is manually rocked on its fulcrum to exert power multiplying lever action on said member to swing the latter and rotate the drum.

A still further object of the invention is to provide a mechanism of the character described in the preceding paragraph wherein the fulcrum of the lever is arranged to travel while ther lever is performing its power multiplying function to provide maximum eiciency in operation.

Other objects of the invention will more clearly appear from the description and claims hereinafter following.

in the drawings forming a part of this specication, Figure 1 is an elevational View of a portion of the end wall of a railway car illustrating my improved hand brake mechanism in connection therewith, the hand brake mechanism being shown .in elevation with the cover plate oi the housing removed. Figure 2 is a vertical sectional view, corresponding substantially to the (Cl. 'i4-506) line 2-2 of Figure l. Figure 3 is a vertical sectional view, corresponding substantially to the line 3 3 of Figure 2. Figure 4 is a part front elevational View and part vertical sectional View oi the mechanism shown in Figure 1, illustrating 5 the locking dog in released position, the part section corresponding to the section shown in Figure 3 and the cover plate of the housing being shown partly in elevation secured in place on the housing. Figure 5 is a vertical sectional view, corresponding substantially to the line 5-5 of Figure 2. Figure 6 is a View similar to Figure l but showing the parts in different positions.

in said drawings, Ill` indicates the end wall of a railway car on which my improved brake mechanism is mounted. The usual brake chain which leads to the brake mechanism of the car and is operatively connected thereto is indicated by Il.

My improved hand brake mechanism comprises broadly a chain winding drum A; an oscillatory link or carrier B swingable about the axis of rotation of the drum; iixed rack members C-C; an actuating lever D pivotally suspended on the link `or vcarrie-r B andv having gear portions E-E in traveling `ulcrum engagement with the rack Y members Cf-C; la ratchet wheelF fixed tothe drumiA; ai gravity inuenced pawl G pivoted on .the carrier B- and cooperating with the ratchet F; a pivoted/locking dog I-l; ,and an operating han- --dle member -K for actuating the dog. The operatingparts kof my improved brake mechanism arepreierably enclosed inea housing which is indicated by M. y Y v The housing M isin the form of a substantially cylindrical, horizontally disposed casing having a vertical back wall. l2 .and a vertical front wall I3 in the kform of a detachable cover plate. The wall 121s extended outwardly beyond thecurved youter Walibi the casing to provide Va .pairrcf spaced topjsecuring ears ide-114' and al depending bottom securingV ear l5. The .casing 'is fixed to the carwall"A IB by securing elements ll5-- l-i.extending'through said ears and the wall ID., These securing ,elements maybe of any Well-known'forn'iv and as herein shown are rela`V tively short bolts. As illustrated mostclearly in Figures i, 3, 4, 5j, and d, at the top of the casing the curved outside Wallis provided with an upwardly offset portion or bulge Il to accommodate certain portions of the locking ldog and actuatl v ing mechanism therefor., 'Between the back and front walls IZ and I 3 the casing is provided with K a web AIS vprojecting inwardly` from'the Vcurved wallroi the casing.A `r T.d'he web Yor iiange I8 is ver- 55 tically disposed and is provided with a relatively large opening I9 of the general outline clearly indicated in Figure 5. The web I8 forms, in effect, a vertical partition wall dividing the casing into front and rear chambers 29 and 2| as clearly shown in Figure 2. The chamber 2I accommodates the chain winding drum A and is open at the bottom, as indicated at 22, to accommodate the brake chain I I for in and out movement. At the forward end of the casing, the curved wall thereof is provided with a continuous, inwardly projecting web 23 having an opening 24 of the outline most clearly shown in Figures 1 and 6. The web 23 is parallel to the web I8 and these two webs form, in effect, inwardly extending flange portions on the curved outer wall of the housing M. At the top of the housing M the web 23 is provided with an outwardly offset section 25 for a purpose hereinafter pointed out. The cover plate I3 abuts the web 23 and is secured thereto by bolts 26-26 or similar fastening devices. The upper portion of the cover plate is properly recessed to accommodate the offset portion 25 of the web 23 and the outer surface of said cover plate is iiush with the outer face of the offset 25. The central portion of the cover plate is offset inwardly or dished, as indicated at 21. The securing bolts 28-26 extend through suitable openings in the cover plate I3 and web 23. The openings in the web 23 for the top set of bolts 23-26 are in the form of open ended, upwardly extending slots and are indicated by 28-28. These slotted openings permit placing of the upper bolts 26-26 in position in said openings by entering the shanks of the bolts sidewise through the open ends of the slots. The openings in the web 23 for the bottom set of bolts 2li-26 are of the usual circular form. Inwardly extending lugs 29-29 and 29-29. are preferably provided on the circular or curved wall of the housing M to serve as abutments for the side faces of the heads of the bolts 26-26 and 26-26 to hold said bolts against turning during application of the usual securing nuts.

The bottom of the outer chamber 20 is also open at the bottom, as indicated at 30, said opening being in the form of a relatively wide slot in the curved wall of the housing, extending upwardly some distance at the right hand side of the housing as viewed in Figures 1, 3, 5, and 6.

At the lower portion of the housing M, spaced inwardly and upwardly from the opening 30, the webs I8 and 23 are provided with thickened transversely aligned arc-shaped portions or flanges which project laterally toward each other and form the xed rack members C--C of my improved mechanism. The rack members C-C are provided with sets of teeth 3I-3I concentric with the axis of rotation of the drum A.

The chain winding drum is of the outline shown in Figure 5 and presents an eccentric winding surface portion 32 provided with an annular groove 33 adapted to accommodate the side portions of alternate links of the chain II. The chain II is suitably attached to the drum A by means of a securing element or bolt 34 extending through the end link of the chain II and aligned openings in projecting ears 35-35 on the drum.

The drum is freely rotatably supported on a horizontal shaft 36 having its opposite ends supported in seats provided by inwardly extending aligned hollow open bosses 3'I-31 on the rear and front walls I2 and I3 of the housing M. The outer end of the drum A projects into the chamber 20 and said projecting portion has the ratchet wheel F formed integral therewith.

The carrier or oscillatory link B is suspended from the shaft 36 between the outer end of the drum A and the boss 31 on the wall or cover plate I3 and is journaled on said shaft for swinging movement. This link extends below the racks C-C and has a pivot opening extending transversely through the lower end thereof, said opening being adapted to loosely receive a pivot pin 38.

The operating hand lever D is in the form of a bar having a hand grip portion at the outer end and a forked head 39 at the inner end. The forked head 39 has laterally spaced jaw members 40--40 which are suitably thickened to strengthen the same, as clearly shown in Figure 2. At the left hand side of the head 39, as viewed in Figure 1, the jaw members 40-40 are connected by a web or upstanding wall portion 4I which serves as a stop to limit relative swinging movement in one direction of the lever D and the link B. At the opposite side of the head 39 the space between the jaws is left open to provide clearance for the link B during swinging movement of the handle lever D to the left with repect to the link, as viewed in Figure 1. Between the jaws 49-40 the head 39 is provided with an upstanding web 42 parallel to said jaws. 'Ihe web 42 extends outwardly beyond the jaws 40-40, as clearly shown in Figures 1 and 3 at an angle to the longitudinal axis of the handle lever D and forms a projecting finger 43 for a purpose hereinafter pointed out. web 42 are provided with transversely aligned pivot pin-receiving openings adapted to accommodate the pivot pin 38. The lower end of the link B is accommodated in the space between the web 42 and the left hand jaw 49 of the head 39, as shown in Figure 2, and the pin 38 which extends through the lower end of said link and the head 39 serves to pivotally connect the handle lever D to said link for relative swinging movement. The jaw members 40-40 of the head 39 of the lever D are provided with sets of teeth concentric with the axis of the pivot pin .38, thereby forming the gear portions E-E which are arranged to mesh with the i'lxed racks C-C. The rack and gear sections C-C and E-E thus provide a traveling fulcrum means for the lever D which has a long and short arm extending in opposite directions from the pivotal connection of the lever with the link B, the short arm carrying the gear portions E-E and the long arm forming the operating hand grip member.

The pawl G is pivoted for rocking movement at a point between its ends on the pin 38, as clearly shown in Figure 3, said pawl being provided with an offset or projecting luglike eye portion 44 through which the pivot pin 38 extends,

the eye portion being accommodated in the pocket formed between the web 42 and the right hand jaw 40 of the head 39 of the handle lever D, as viewed in Figure 2. As will be evident, the pawl is thus movable in unison with the link B. Upon reference to Figure 2, it will be seen that the pawl G is in vertical alignment with the ratchet wheel F. The pawl G has a tooth 45 at Vone end thereof adapted to engage with the teeth 4gravity..'Il'le .pawl G thus has, in effect, two

arms extending in opposite directions from the..

The jaws 40-40 and the pivot thereof, one of which arms forms a weighted tail member and the other of which has intermittent gripping engagement with the ratchet wheel F when the link B is reverselyoscillated. Between the pivot of the pawl G and the tooth 45, the pawl is provided with a laterally projecting lug 41 adapted to be'engaged by the linger 43 of the lever D to trip the pawl to positively disengage the same from the ratchet wheel F when the, lever moves to the pendant position shown in Figures 1, 2, 3, 4, and and hold the pawl disengaged as long as the lever remains in said pendant position. As shown in Figure 3, the nger 43 preferably is notched at the outer end portion thereof, as indicated at 48, to flt over the top and inner side of the lug 41.

The locking dog H is mounted above the ratchet wheel F in vertical alignment therewith and is controlled by the operating handle member K to which it is connected. The handle member K is in the form of a crank and has a horizontally disposed, shaftlike portion 49 journaled in a bearing seat 58 in the form of a boss on the web I8 and a second seat 5I formed partly on the cover plate I3 and partly on the offset portion 25 of the web 23 of the housing M. At the outer end, the shaft 49 is provided with a right angular arm 52 exterior to the housing M. The arm 52 is preferably weighted at its outer end, as 'indicated at 53. To prevent endwise displacement of the shaft 49 when the parts are assembled, the shaft is formed with an annular flange 54 which bears on the inner side of the bearing seat 5l. The shaft 49 serves to pivotally support the dog H, the latter being journaled on said shaft adjacent the bearing boss 50, as clearly shown in Figure 2. The dog H is provided with a tooth 55 at one end adapted to engage with the teeth of the ratchet wheel F and a short finger 56 at the other end having a laterally projecting lug 51 thereon. At the toothed end of the dog, a second lug 58 is provided thereon, projecting from the same side of the dog as the lug 51. Adjacent the dog H, the shaft 49 is provided with a radially projecting short arm 59 adapted to engage the lug 51 when the weighted arm 52 is thrown to the extreme right, as shown in Figure 4, to rock the dog and disengage the same from the ratchet wheel F, and to engage the lug 58 when the arm 52 is thrown to the left, as shown in Figures 1 and 3, to throw the dog into operative ratcheting position with respect to the ratchet wheel I3. Due to the handle lever mem-ber K being weighted, the dog H will be maintained either in the disengaged position mentioned or when in engagement with the ratchet wheel F will be heldin ratcheting relation therewith by the action of gravity on the lever member K. It is further pointed out that when the lever member K is moved to disengage the arm 59 thereof from the lug 51, the dog H by its own weight, will be urged into engagement with the ratchet wheel F through the action of gravity by overbalancing `action of the toothed end thereof.

In assembling the parts of my improved hand brake, the drum A with the chain II attached thereto is first placed within the housing by entering the drum through the open front end of said housing and passing the same through the opening I9 of the web I8 into the chamber 2|, vthe chain I I being passed through the opening I Il with the drum and threaded through the bottom opening 22 of the chamber 2l. After the drum A has been placed in position in the Ychamber 2l, the lever D with the link B and the pawl Gattached thereto by means ofthe pivot 38 are placed in position by entering the link B, the pawl G, and the head 39 of the lever through the opening 3|] into the chamber 20 and bringing the opening at the upper end of the link B into axial alignment with the opening of the drum A. The drum shaft 36 is then engaged through the openings off the link B and the drum A and its inner end seated in the pocket of the boss 31 on the rear wall I2 of the housing M. The operating handle lever member K with the dog H mounted on the shaft portion 49 of said member are then placed in position within the chamber 2U, the inner end of the shaft 49 being seated in the pocket of the bearing boss 5l) on the web I8 of the housing and the outer endportion of said shaft being seated in the part 4bearing seat 5I of the offset portion 25 of they web- 23 of the housing M. After thel parts have been thus assembled, the cover plate I3 is applied and secured in position by the bolts 2li-26, the outer end of the shaft 35 being seated in the boss 31 of the cover plate I3, and the part bearing 5I of the cover plate engaged with the underneath side of the shaft 49 of the operating handle member K. When the parts have been thus completely assembled, the gear portions E--E of the lever D are held in mesh with the racks C-C and they pivot pin 38 which connects the handle D to the link B and the pawl G is held against endwse removal by the overhanging Walls formed by the bottom sections of the webs I8 and 23 of the housing M.

The operation of my improved hand brake mechanism, in applying the brakes, assuming the parts are in the position shown in Figure 1, is as follows: The operator swings the handle lever D in a contraclockwi'se direction, therebyeffecting fulcruming movement of the gear portions E-E of the head 39 on the racks C-C, thereby effecting swinging movement of the pivotally conf nected link B about the axis` of the drum shaft 35 in a contraclockwise direction. At'the same time the handle lever D turns Von its pivotal connection with the link B, swinging the finger 43' on the head of the lever upwardly in a direction away from the lug 41 of the pawl G, thus freeing the pawl to swing into operative engagement with the teeth of the ratchet wheel F. Inasmuch as the pawl G, which is urged into engagement with the ratchet wheel F by the action of gravity, is

forced to travel with the link B and the head 39 of the lever D, the ratchet wheel is rotated and in turn effects rotation of the drum A to wind the chain Il thereon. The-parts may thus be operated until they reach approximately the position illustrated in Figure 6. As illustrated in Figure 6, the ratchet wheel F has been advanced approximately the distance of two teeth from the position shown in Figure 1 and thereby effected rotation of the drum A to a similar extent. After the parts have reached the position shown in Figure 6, the handle lever D is swung back to the position shown in Figure 1. During this returning movement ofthe lever D, the pawl G idles over the teeth of the ratchet wheel F which is held against backward rotation by the locking dog H. The forward and backward movements of the lever D are repeated until the brakes are fully applied. As will thus be evident, the tightening operation of the brakes is effected by simply oscillating the handle lever D.

When the brakes have been fully applied and the operator releases his hold from the lever D,

to the pendant position shown in Figure 1. As

the lever drops to this position, the pawl G is automatically disengaged from the ratchet wheel F by the finger 43 on the head of the lever D and held clear of the teeth of the ratchet wheel F while the lever D remains in the pendant position shown in Figure 1. The parts will thus always assume the position shown in Figure 1 after the brakes have been operated regardless of the extent to which the brake tightening operation is progressed.

In order to release the brakes, the locking dog H is disengaged from the ratchet wheel F by swinging the operating lever member K to the right from the position shownin Figure 1 to that shown in Figure 4, the arm 59 on the shaft of the member K engaging the lug 5l on the dog to rock the dog on its pivot and trip the same. The instant the dog is disengaged from the ratchet wheel F, the latter and the drum A are free to rotate, thereby permitting unwinding of the chain Il and quick release of the brakes. After the brakes have been released, the dog I-I is again brought into engagement with the ratchet wheel F by swinging the operating lever member K in a reverse direction, from the position shown in Figure 4 to that shown in Figure 1, the arm 59 engaging the lug 58 of the dog to positively force the dog into engagement with the teeth of the ratchet wheel F. Thel dog H will drop back to ratcheting position through the action of gravity when it is freed by the arm 59 being moved out of engagement with the lug 51, but in the event that the dog H does not drop freely into ratcheting position, the weight of the lever member K when swung to the position shown in Figure 1 will forcibly move the same to the ratchet engaging position and byits weight being added to the weight of the dog assure proper ratcheting action.

I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative and I contemplate all changes and modiiications that come within the scope of the claims appended hereto.

I claim:

1. In a hand brake mechanism, the combination with a rotary chain winding element; of an actuating lever having a long arm and a short arm, said short arm being fulcrumed for rocking movement about its outer end, said fulcrum being eccentric to the axis of rotation of the Winding element; and means pivotally mounted on the other end of said short arm, operatively connecting said last named end of said short arm to the drum for rotating the latter, said means being bodily movable with the axis of pivotal connection thereof with said arm.

2. In a hand brake mechanism, the combina'- tion with a rotary chain winding element; of a xed support; an actuating lever having a relatively short power multiplying arm, and a long arm by which the same is actuated, said short arm at one end having traveling fulcruming engagement on said support; and means for operatively connecting the other end of said short arm to said element to transmit motion to the latter.

3. In a hand brake mechanism, the combination with a rotary chain winding element; of a xed support; an actuating lever fulcrumed to rock on its inner end on said support; and means operatively connecting said lever to said element and actuated by said rocking movement of said lever to rotate said element, said means being connected to the lever between the ends thereof at a point a shorter distance from the inner than from the outer end` of saidlever.

4.V In a -hand brake mechanism, the combination fwith a rotary chain winding element; of a carrier swingable on the axis of rotation of said element;` an actuating lever pivotally connected to said carrier eccentricV to the axis of swinging movement of the latter, said lever having long and short arms extending from said pivotal connection; a support on which the outer end of said short armfis fulcrumed to effect swinging movement of said carrier when the lever is actuated; and means operatively connecting said carrier and element for transmitting movement from the carrier to said element.

5. In a hand brake mechanism, the combination with a rotary chain winding element; of a link pivotally supported at its inner end for movement; an intermittent driving connection between the link and the winding element;- and means for swinging said link on its axis comprising an operating lever pivotally connected to the outer end of said link for swinging movement with respect to said link and having long and short arms extending from said connection, said short arm being fulcrumed to swing on its outer end and rock the same on the pivotal connection with said link.

6. In a hand brake mechanism, the combination with a rotary chain winding element; of an operating lever having a short and a long arm; supporting means on which the outer end of said short arm is fulcrumed for rocking movement; intermittent grip means operatively connecting the inner end of said short arm to said winding element for rotating the latter; and guide means for maintaining said short arm in operative engagement with said supporting means.

7. In a hand brake mechanism, the combination with a rotary chain winding element; of a link supported at its inner end for rotation about the axis of. rotary movement of said element; an operating lever pivotally connected to the outer end of said link for swinging movement with respect to said link; an intermittent drive connection between said link and winding element; and fulcrum supporting means engaged by said lever and on which said lever fulcrums for rocking the same with respect to said link on its pivotal connection with the latter, to swing said link on its axis of rotation..

8. In a hand brake mechanism, the combination with a rotary chain winding drum; of a ratchet wheel xed to said drum and rotatable therewith; a link supported at its inner end for swinging movement about the axis of rotation of said ratchet wheel; a lever pivoted to the outer end of said link; fulcrum means offset with respect to the pivotal connection of the lever with said link, on which said lever is supported for rocking movement; and a pawl operatively connected to the outer end of said link and engageable with said ratchet Wheel for actuating the latter to rotate the drum.

9. In a hand brake mechanism, the combination with a rotary chain winding drum; of a ratchet wheel fixed to said drum; a link supported at its inner end for swinging movement about the axis of rotation of said ratchet wheel; an operating lever pivoted to the outer end of said link and having long and short arms extending from said pivotal connection with said link; a fulcrum support for the outer end of said short arm with which the latter has rocking engagement; a pawl operatively connecting said link and ratchet wheel, said.' pawl being pivotally connected to the outer end of said link; and means for locking said ratchet wheel against retrograde movement.

10. In a hand brake mechanism, the combination with a rotary chain winding drum; of a link mounted for swinging movement about the axis of rotation of said drum; a fixed rack concentric with said drum; a lever having its inner end pivotally connected to the outer end of said link, said pivoted end of the lever having gear teeth thereon meshing with the fixed rack; and intermittent grip means operatively connecting said link and lever to the drum to actuate the latter.

11. In a hand brake mechanism, the combination with a rotary chain winding drum; of a iixed rack concentric with said drum; a link having its inner end pivotally supported for swinging movement about the axis of rotation of said drum; an actuating lever having a head at its inner end pivotally connected to the outer end of said link, said head having a set of gear teeth thereon meshing with said rack, said set of teeth being concentric with the pivotal connection of said head with the link; and an intermittent grip connection between said link and drum for transmitting movement to said drum when said lever is actuated.

12. In a hand brake mechanism, the combination with a rotary chain Winding drum; of an actuating lever provided with a head at its inner end having gear teeth; a fixed rack with which said gear teeth mesh; means for guiding the movement of the head of said lever in a path to maintain the gear teeth thereof in engagement with said rack; and intermittent grip means operatively connecting said lever head with said drum to transmit motion from the lever to said drum.

13. In a hand brake mechanism, the combination with a rotary chain winding drum; of a shaft on which said drum is rotatably supported; a link having its inner end journaled on said shaft; a ratchet wheel xed to the drum; a xed rack concentric with the drum; an actuating lever having a series of gear teeth at the inner end* meshing with said rack; a pawl cooperating with said ratchet wheel; and a pivot member operatively connecting said pawl and head of the lever with the outer end of said link, said pivot member being concentric with the series of gear teeth of the head.

14. In a hand brake mechanism, the combination with a rotary chain winding drum; of a fixed curved rack concentric with the axis of rotation of the drum; a lever having a set of gear teeth at the inner end thereof engaged with said rack; a link pivotally connected to said lever concentric with the set of teeth of the latter; means for supporting said link for swinging movement about the axis of rotation of the drum; and means for transmitting movement from said link to said drum.

15. In a hand brake mechanism, the combination with a rotary chain winding drum; of a lever having a traveling fulcrum comprising a fixed rack and rotary gear member fixed to said lever and in mesh with said rack; and a motion transmitting element connected to said lever and having intermittent gripping engagement with the drum to rotate the latter.

16. In a hand brake mechanism, the combination With a rotary chain Winding drum; of a ratchet element xed to said drum; a pawl engageable with said ratchet element; a lever to which said pawl is pivotally connected, said lever having a fixed gear member thereon concentric with the pivotal connection thereof with said pawl; a fixed rack on which said gear member has traveling movement; and a link to which said lever is pivotally connected, said link being supported for swinging movement about the axis of rotation of said drum.

17. In a hand brake mechanism, the combination with a rotary chain winding drum; of a ratchet wheel xed to said drum; an operating lever having an actuating pawl pivotally connected thereto and engageable with said ratchet wheel; means supported for swinging movement with respect to said drum for supporting said lever, said lever being pivotally connected to said last named; means; and means on said lever having shouldered engagement with said pawl for disengaging the latter from said ratchet wheel, when said lever is moved in one direction.

18. In a hand brake mechanism, the .combinationl with a rotary chain winding drum; of a 'ratchet wheel iixed to said drum; a link supported at its inner end for swinging movement about the axis of rotation of said drum; a lever having its inner end pivoted to the outer end of said link; a weighted pawl pivotally connected to the outer end of said link and urged into engagement with said ratchet wheel by the action of gravity; a fixed finger on said lever engageable with said paWl for tripping the latter to disengage the same; a fulcrum support for said lever; and means on said lever offset with respect to the pivotal connection thereof with said link having traveling rocking engagement with said fulcrum support.

WILLIAM M. DWYER.

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