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Publication numberUS2661033 A
Publication typeGrant
Publication dateDec 1, 1953
Filing dateMar 5, 1952
Priority dateMar 5, 1952
Publication numberUS 2661033 A, US 2661033A, US-A-2661033, US2661033 A, US2661033A
InventorsDaniel David M
Original AssigneeUnited Engineering Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Roll shifting means for resaw devices
US 2661033 A
Images(7)
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Description  (OCR text may contain errors)

Dec. 1, 1953 D. M. DANIEL 2,661,033

ROLL SHIFTING MEANS FOR RESAW DEVICES Filed March 5, 1952 7 Sheets-Sheet l INVENTOR DAV/D .D IE1.

A T TQRIVE Y D. M. DANIEL ROLL SHIFTING MEANS FOR RESAW DEVICES Dec. 1, 1953 7 Sheets-Sheet 2 Filed March 5, 1952 INVENTOR.

0A W0 M. DAN/EL BY) ATTORNEY Dec. 1, 1953 D. M. DANIEL ROLL SHIFTING MEANS FOR RESAW DEVICES '7 Sheets-She v 5 Filed March 5, 1952 vINVENTOR. 0A v/o M. DAN/4 M ATTORNEY Dec. 1, 1953 D. M. DANIEL ROLL SHIFTING MEANS FOR RESAW DEVICES 7 Sheets-Sheet 4 Filed March 5, 1952 l IN V EN TOR.

04 W0 M. DAN/EL 52% a A T TOR/YE) Dec. 1, 1953 D. M. DANIEL 2,561,033

ROLL SHIFTING MEANS FOR RESAW DEVICES Filed March 5, 1952 7 Sheets-Sheet 6 74 7/ Fig. 6.

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DAVID M. DAN/EL ATTORNEY Dec. 1, 1953 D. M. DANIEL 2,661,033

ROLL SHIFTING MEANS FOR RESAW DEVICES Filed March 5, 1952 7 Sheets-Sheet '7 INVENTOR.

79 DA wo M. DAN/EL ATTORNEY Patented Dec. 1, i953 ROLL SHI FTING MEANS FOR RESAW DEVICES David M. Daniel, Berkeley, Calif., assignor to United Engineering Company, San Francisco,

Calif., a partnership Application March 5, 1952, Serial No. 274,940

This invention relates to improvements in power saws, and particularly to improvements in feed and guide mechanisms for power saws of the type used for re-sawing; i. e., for sawing into sized boards the large sections which were cut from the log when it was first sawn at the lumber mill.

The problems solved by the present invention have to do with machines used in re-sawing these large timbers. One type of re-sawing is known as center sawing, where the saw blade cuts a straight path down the center of the timber, equally distant from its two edges. In this type of re-sawing the feed rolls on both sides of the timber must move an equal distance in opposite directions as the thickness of the timber varies. The other type of re-sawing is known as slab sawing, where a series of slabs of uniform width are cut off, one at a time and from only one side of the timber, until only a thin slab remains. In slab-sawing the inside feedroll is secured so it does not yield, because each slab cut off is to be of uniform thickness. The outer feed roll is mounted so it will yield as it passes over the irregularities that may be present on the other edge of the timber. A machine must be able to do both types of re-sawing and in both the cut made must be accurate.

One problem in earlier machines has arisen because in re-sawing the mill operator must alternate many times a day between slab sawing and center sawing. Heretofore the changeover from one to the other has been a relatively slow and cumbersome operation. The present invention has solved this problem by a construction which is very simple and quick to-operate and which is fool-proof in operation. Time heretofore lost in the changeover is practically eliminated. In a busy mill every moment that the saw is idle is very costly in labor and in lost production.

The combination of the present invention also has solved the problem of accuracy with speed in the changeover from center sawing to slab sawing or vice versa. It does this by the novel type of linkage between the members to control positioning of the feed rolls, wherein by simply changing the position of one pin, the two feed rolls may be linked to move in concert (for center sawing) or the inside rolls may be locked to the saw table while only the outside rolls move with the variation in thickness of the timber (for slab sawing).

Another problem which this invention solves relates to the trouble experienced in'the past with binding between the two collars on the two set- 11 Claims. (01. 143-4 ting shafts with the roller on the yokes on the ends of the control link between the shafts. The present invention has solved this problem by providing a novel type of collar-and-roller connection.

Other objects and advantages of the invention will appear from the following description of a preferred embodiment thereof. This embodiment is described in detail in order to comply with the provisions of United States Revised Statutes, section 4888, but it is not intended to limit the in- -vention to any of the detailed forms of structure "described. The scope of the invention is defined by the appended claims.

In the drawings:

Fig. 1 is a reproduction of a photograph of a re-saw machinewith a feed mechanism embodying the principles of the present invention.

Fig. 2 is a view in perspective of a portion of the re-saw machine of Fig. 1, showing the feed roll adjustment mechanism with the quick changeover structure. For purposes of clarity the outside feed roll and its housing have been shown in phantom (dot-dash line), and a portion of its base has been cut away to show the attachment of the base to the'threaded shaft by which the outside feed-roll housing may be moved back and forth. Other parts, such as the base 36, which would detract from the clearness of the showing .of the changeover structure have been omitted, .or have been shown broken away with only the .outline dotted in.

Fig. 3 is a view in elevation of the table and feed roll portion of the device looking at it from the left side of Fig. 1.. 3 Fig. v4 is a like view looking at the device from the-right side. The view shows part of the feed roll housing cut away to expose the drive mechanism toone feed roll.

Fig. 5-is a fragmentary view in plan and partly in section taken generally along the line 5-5 of Fig. 4, and showing the linkage of the feed-rollposition-adjustment shafts to the control levers looked as they would be when the saw is set for slab sawing, but before a board is inserted to be cut.

Fig. 6 is a view similar to Fig. 5 showing the parts in the positions assumed when preparing to or when making a slab cut from a timber. The inside feed roll has remained locked in position on the bed; while the outside feed roll (a) has been moved outwardly by the foot control in the first instance when the'timber is fed to the blade or (b) has been held outwardly by contact with the timber as it is fed past the saw blade.

Fig. 7 is a view similar to Figs. 5 and 6 showing the device as connected for use in center sawing. The locking pin having been moved to a position where it looks both the feed roll shifting mechanisms together for synchronous movement toward or away from the saw blade.

Fig. 8 (sheet 5) is a view in section taken along the line 88 in Fig. 5.

Fig. 9 is a view in side elevation looking at Fig. 5 from the left hand side, in the direction indicated by the arrow 9.

Fig. 10 is a view in section taken along the line ||l||l in Fig. 5.

Fig. 11 (sheet '7) is a view in perspective of the control lever that is linked with the outer feed roll, and to the foot control pedal.

Fig. 12 is a view in perspective of the lever that is linked with the inner feed roll. This lever may either be locked to the main frame of the saw so that its feed roller housing will remain stationary, or it may be locked to the control lever of Fig. 11, so that the two feed-roll-mech-anisms will move toward or awayfrom the saw blade together.

Fig. 13 is an enlarged view in section taken along the line |3--i3 in Fig. 5, showing the novel connection that prevents binding from occurring between the collars on the adjusting shafts and the pins on the yokes on the control levers.

Although the invention may be used in connection with many types of saws, it will be better understood by describing its use in one specific type of saw, and for this purpose a large power resaw has been selected. The photograph of the machine, reproduced as Fig. 1, shows such a resaw 243 having a band-type blade 2| which runs around the upper half of an upper idler wheel 22 and around the lower half of a lower driven wheel 23 (Fig. 3). Both the upper and lower wheels 22, 23 may be encased in shields 24 and supported on a main frame 25 which also supports the saw table and feed mechanism frame 25.

The timber feed and guide mechanism includes two pairs of driven feed rolls. The rolls 3!], 3| are mounted in a housing 32 and the rolls 33, 34 are mounted in the housing 35. The housings 32 and 35 are each slidably mounted on the saw table plate 3'5.

All the feed rolls 3!}, 3|, 33, 34 are driven, and

for this purpose each feed roll mechanism 32 and 35 preferably has its own motor 31, 38 (Fig. 3). The broken away portion of Fig. 4-. shows how the motor 31 is used to drive the pair of feed rolls 3| 3| that are in the housing 32. The motor 39 rotates a deep-grooved sheave 40. One or more belts 4| transmit power from the sheave 413 to a second sheave 42, which is mounted on a shaft 43. A spur gear 44, also mounted on the shaft 43', then drives to gears 45, which are keyed each to its adjacent feed roll which turns free on the shaft 46.

The feed roll mechanisms 32, 35 are made slidable horizontally along the base of the saw table 25 by providing them with flanged bases 41, 48 which engage the flanged bed 36 formed along the top of the saw table 26. oppositely threaded shafts 5|, 52 engage interiorly threaded sleeves 53, 54, secured to the bases 41, 48, respectively, so that rotation of the shafts 5|, 52 will cause the feed mechanisms 32, 35 to move inwardly or outwardly along the bed 36 with respect to the saw blade 2| and each other. The shafts 5|, 52 may be rotated separately by placing a hand crank. 55 (Fig. 9) on their respective splined outer ends 55, 51. Spur gears 58, 59 are also splined respectively to shafts 5|, 52 for relative sliding movement so that any axial movement of the shafts will not be transmitted to the gears. A transmission spur gear as is positioned to mesh with the gears 53, 59 so that by turning the crank 55 with the gears in mesh,'the roll feed mechanisms will move toward or away from each other in concert. To disengage the gear 55, it can be moved axially outwardly on its stub shaft 8|. (Fig. 6). Then the operator can place the crank 55 on the screw shafts 5| and 52 separately to accomplish an independent positioning of each feed. roll housing 32, 35 on the bed plate 36.

One of the novel features of construction of the invention has to do with the means whereby the shafts 5| and 52 can be locked to move axially in synchronism or the shaft 5i can be locked against movement while the shaft 52 is left free to move axially under the influence of the timber being sawed. This means might be described as multiple or complementary levers.

One of these levers 55 is shown in perspective in Fig. 11 and in its position in the machine in Fig. 2. The lever 65 on one side of its bearing 55 has provision through a yoke for connection to the shaft 52, as well as provision near the yoke for a yieldable spring connection to the base 25; and on the other side of its bearing it has provision for looking it to its complementary lever 61 and to the foot lever means 58 for spreading'the feed rolls apart when a timber is to be fed into the saw.

When in place the lever 65 is journaled at 66 for swinging movement around a vertical pin 69, which pin is supported in the bed plate 35 and its base 25 (see Figs. 2, 5, and 8). On the yoke side of the lever 55 a collar 18 is provided through which slides a shaft 1| of lesser iameter (see Figs. 2 and 5). This shaft is secured at l2 to a boss 13 on the side of the bed plate 35. A spring M fits around the shaft at its other end between the nut 15 and the collar 15). When the lever 55 swings counter-clockwise in Figs. 5-7, the collar Hi compresses the spring 74 against the nut 15. As shown in Figs. 3, 11 and 13, the lever 65 has an extension to form a yoke 35 in which is supported a pair of anti-friction rollers l? on studs 18 held there by suitable nuts i9.

Another feature of novelty is the provision of support for the pair of collars 8|! which engage the anti-friction rollers ll. This support includes the small collar 8| placedon the shafts 5i and 52 between the collars 8!]. It functions as a spacer between the collars. It is a few thousandths of an inch longer axially than the diameter of the anti-friction rollers 11, so that when the shafts 5| and 52 are turned in making adjustments, it will be impossible for the collars to get close enough together to bind on the rollers H. The collars are positioned on the threaded portion 82 of the shafts 5|, 52 by the nuts 83.

The complementary lever 5! (see Fig. 12) has a bearing 85 to fit on the pin 63 above the bearing 65 in the lever 55 so the two levers swing on a common center. The lever 51 has a yoke 88 with anti-friction rollers ll located on the arm the same distance from the pivot es as those in the yoke 15 of the member 55. These are engaged in the space between the collars 35 mounted on the shaft 5| in like manner to those mounted on the shaft 52.

The outer end of the lever 6'! has provision for :two holes 81 and 88 that play an important part of the lever 61 while thehole 38 is formed with a depending face or notch 90 in which the complementary end 9| of thelever 65 can nest and thereby bring the holes 88 and 52 into quick alignment to receive the locking pin 95. When this pin is in place the complementary! levers 55 and 61 are as one lever (see Fig. '7). When this pin 95 is out of the aligned holes 88 and 32, the levers 65 and 61 move independently. The operator removes the pin 95 when he desires to do slab sawing and this requires that the inner feed rollers 35, 3| be positively locked on the bed plate 35. This is accomplished by means of the bracket 96 on the machine frame 26 having a horizontal portion 9! with a recess 38 (see Fig. 2) into which the lateral extension 89 on the lever 67 nests so its hole 3'! aligns with the hole 99 in the bracket 96. Then the operator places the pin 95 in the holes 31, 99 locking the shaft 5! and the connected feed roll mechanism 32 to the frame 26 (see Fig. 6).

Thus, by means of a single lock pin 55, the lever 61 may be secured either to the frame 25, as in Figs. 5 and 6, free to move independently of the lever 51, or it may be freed from the frame 26 and locked for movement as one with the lever 65, as shown in Fig. '7. When the lever 61 is locked to the frame 26 (see Figs. 5 and 6), it holds the inner feed roll mechanism 32 stationary on the saw bed 35, whereas the outer feed roll mechanism 35 is free to slide on the saw bed 35 so the feed rolls under the pressure of the spring 14 exert a yielding pressure against a timber passing through the saw. This is the position that is used when the re-saw is being used for slab sawing. When the lever parts 55 and 51 are locked together as in Fig. '7, the re-saw is useful for center sawing; for this hook-up the inner feed roll mechanism 32 and outer feed roll mechanism 35 will advance towardor retract from the saw blade identical distances which means that the saw blade will pass down the center of the timber, assuming that at the outset the feed mechanisms were set an equal distance from the saw blade.

When the levers 65 and 6'! are locked together, n

the pressure of the spring 'M will cause the end of the lever 6'! to nest in the recess 38. This means that the opposite set of feed rolls are too close to allow a timber ready to be sawn to enter or to reach the saw blade. rolls apart when ready to introduce the timber .to the saw, a pedal arrangement 53 may be used as this leaves the operator's hands free for other tasks. I

The one shown here includes the pedal I08 (see Figs. 1, 2, and 4) which is secured on a lever ||i| pivotally mounted at I02 on the main saw frame 25. A clevis I03 is pivoted at :04 to the lever 5| and its opposite end is pivoted at I05 to a yoke member I06 whose upper end is pivoted at IIl'I to a bell crank I08, which in turn is journaled at I09 to the main table frame 25. A rod I I6, connected by a clevis I II to the hole in the laterally offset end of the lever 55 extends through the yoke I55 and through a slotIIZ in the lower arm of the bell crank I38. A nut ||3 secured to the rod II 3 abuts the rear face of the slot 2 in the lower arm of the bell crank I08. When the operator steps on the pedal 100, the rod I I0 moves to the right (in Figs. 2and 4),

To move the feed and this moves the lever 65. If the levers 65 and 31 are locked together bythe pin 95, the efi'ect will be to move both feed roll mechanisms 32, 35 apart; that is, back from the saw blade 2|. If the lever 65 is free and the lever 61 is locked to the frame bracket 96, the inside feed roll mechanism 32 will remain in fixed position on the saw table 35, whereas the outer feed roll mechanism 35 will move outwardly on the saw table 35 away from the saw blade 2|. When pressure on the foot control pedal I00 is released, the spring I4 restores the lever 55 to its normal position, and also causes the rod III) to follow the bell crank I08 back to its normal position.

Operation Suppose that the operator has a timber of any length which measures 12 inches square in cross section and it is desired to cut it into boards or slabs one inch thick. The first thing he-will do will be to place the pin in the hole 81 to lock the lever 61 to the frame 25. He will then disengage the gear 59 and by means of the crank 55 on shaft 5| will move the gear set of feed rolls 35, 3| up to a position one inch away from the saw blade 2|. He will place the crank 55 on the shaft 52 and move the outer set of feed rolls 33, 34 outaway from the saw blade 2| to a position less than eleven inches from the blade 2|. There is about an inch and a half of motion possible in the tension spring I4 to apply pressure on the outside edge of the timber so it is preferable that the feed rolls 33, 34 be set about ten to ten and a half inches from the saw blade for the first cut. Assuming that the saw blade is moving, the operator will set the feed rolls 35, 3|, 33 and 34 in operation at the speed it is desired for the timber to travel past the saw blade. The operator will place one foot on the pedal I00 which will move the feed roll housing 35 back more than eleven inches from the saw blade and that will provide an opening between the feed rolls 30, 3| and 33, 3d of slightly over 12 inches, the width of the timber.

As soon as the timber is between the first feed rollers 30, 33 he will release the pedal I01! and the spring 14 will move the roller 33 against the side of the timber to bring it against the roller 30. This positions the timber before it has engaged the saw blade. The feed rolls force the timber through the saw and off the back side is cut the first slab one inch thick. While the timber is being returned for its next trip through the saw, the operator rotates the shaft 52 by the crank 55 to move the feed rolls 33, 34 about an inch closer to the saw blade 2|. This is repeated for each slab that is cut from the timber. Now assume that the next use for the saw is a job of center sawing, that is to saw timber down the middle. The operator moves the looking pin 95 into the holes 88 and 92 to lock the levers 65 and 61 together. Then the operator turns the shafts 5| and. 52 separately by the crank 55 until he has the feed rolls 30, 3| and 33, 34 equally distant from the saw blade 2|. Then he engages the gear 63 between the gears 58 and 59. As the first timber is placed with its end on the feed table 35 he gauges its width and turns the crank 55 which may be on either shaft 5| or 52. Turning the crank will rotate both shafts and move the feed roll housings 32 and 35 in concert, toward or away from the saw blade 2|. Having in mind that thespring '14 will allow about one and a half inches of movement to the shafts 5| and 52, and hence to the feed rolls, he will be able to take a timber which varies along its length up to 3 inches in width. If it varies more than this, he may have to move the crank some as the cut progresses. Assuming the maximum variation in thickness is only two inches, he will set the feed rolls so they are spaced apart about a half inch closer than the minimum width of the timber. Then he puts his foot on the pedal N30 to spread the feed rolls apart while the timber moves up between the rollers at and 33. When he releases the pedal, the spring M soon centers the timber on the saw blade and the cut proceeds. As the timber moves along and its width varies, the rollers 30, 3| move back the same distance the rollers 33, 34 move out, and Vice versa, so that the saw blade will cut down the middle of the timber.

Assuming the next timber is to be slab sawed, then the operator merely shifts the pin 95 to lock the lever 6'; to the bed plate 26 and he proceeds as set out before.

What is claimed is:

l. A selective control mechanism for the slidable guide members mounted on the frame of a resaw device, comprising a first lever pivoted between its ends and between said guide members to said frame and. having means for connecting at all times one of its arms to one only of said slidable guide members for movement therewith; a second lever pivoted to said frame between its ends and between said guide members, and having means for connecting at all times its arm which is opposite to the connected arm of said first lever to the other of said slidable guide members for movement therewith; releasable means for physically and directly connecting said levers to work in unison; and releasable means for physically and directly securing one of said levers irn-rnovably to said frame while the other of said levers remains free to rotate about its point of connection to said frame.

2. The device of claim 1 in which said levers are mounted on a common pivot point.

3. The device of claim 1 in which said means for connecting said levers to their respective slidable guide members each includes a threaded rod engageable in a threaded portion of its respective guide member.

4. The device of claim 1 in which there is a resilient pressure means for urging said levers against said securing means on said frame.

5. A resaw device, adapted for slab-sawing and center-sawing, having in combination a frame; a saw table mounted thereon; a saw means therein for moving a saw blade over said table; a feed and guide roll means on each side of said saw blade, each being slidably mounted on said table for movement toward and away from said saw blade; a plural lever mechanism for controlling the movement of said feed and guide roll means independently or in concert; including a first lever pivoted between its ends to said frame, and. having a yoke near one end, a threaded rod secured to said yoke and engaged in a female threaded portion securing it to one of said feed and guide roll means, a resilient pressure applying means normally urging said lever inwardly whereby its connected roll means is urged toward said saw blade; a second lever mounted to swing co-axially with said first lever, and having a yoke on the opposite side of the pivot point to the yoke on said first lever, a threaded rod secured to said yoke and engaged in a female threaded portion securing it to the other of said feed and guide roll means; means for securing said levers for movement as one; and means for securing said second lever to said frame to anchor it against movement while said first lever is left free to move.

6. The device of claim 5 in which there is an additional lever secured to said first lever so the operator can move the same against the resilient pressure applying means in order to spread apart said feed rolls to facilitate introduction of a timber to said saw blade.

'7. The device of claim 5 in which said last two named means are effected by placing the same pin in one or the other of closely adjacent aligned sets of holes.

8. The device of claim 5 in which said resilient pressure applying means, at the end of making a cut, returns the first and second levers against stops with the holes, required for effecting the securing recited in the last two means, in alignment to receive a locking pin in one or the other set of holes.

9. In a control mechanism for the feed and guide rolls of a re-sawing machine, having a saw table, a saw blade movable therein, feed and guide roll means movable toward and away from said saw blade; the combination of a lever mechanism including a pair of levers, one lever being connected to one of said feed and guide rolls and the other lever being connected to the other thereof so any movement of either of said levers will effect a like movement of its connected feed and guide roll toward or away from said saw blade, said levers each having a first opening therethrough, said openings being alignable with each other, one said lever also having a second opening therethrough alignable with an opening extending through a portion of said frame; rod means for operatively connecting said levers for simultaneous movement by passing through both said alignable first openings in said levers, which movement when occurring will cause said feed and guide roll devices to move in opposite directions, said rod means, when said levers are disconnected, serving to extend through said frame opening and said second opening for securing one of said levers against movement while the other lever remains unsecured which will thereby anchor one of said feed and guide rolls against movement while the other will be free to move toward or away from said saw blade; and means for applying resilient pressure tending to urge said feed and guide roll means toward said saw blade.

10. In a feed roll and guide mechanism for saws the combination of a saw table; a saw blade movable therethrough; independently movable feed roll and guide roll mechanisms mounted adjacent said table and on opposite sides of said saw blade; means for controlling the position of each of said mechanisms on said saw table in relation to said saw blade; said means including a pair of levers, each having a common pivot point and each being operatively connected to move one of said mechanisms toward and away from said saw blade, said levers each having first openings through them alignable with each other whereby rod means may be inserted therethrough for selectively securing said levers together to move as one and one of said levers having a second opening therethrough alignable with an opening in a portion of the frame whereby said rod means may be inserted therethrough for se curing one of said levers in a non-movable position, while leaving the other lever free for movement, whereby in the latter case one only of said mechanisms will yield as a piece of wood is being cut, but in the former case with said levers secured together both of said mechanisms will advance toward or retreat from said saw blade in concert as a piece of wood is being cut.

11. The device of claim 7 in which said pin is a tapered pin.

DAVID M. DANIEL.

References Cited in the file of this patent I UNITED STATES PATENTS Number Number Number Name Date McDonough Sept. 12, 1899 Lewis Nov. 30, 1920 Bridges June 4, 1929 Jenkins Jan. 12, 1932 FOREIGN PATENTS Country Date Norway Oct. 26, 1903 Norway May 27, 1947 Switzerland June 1, 1939

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US547796 *Jul 1, 1895Oct 15, 1895 Band-saw resawing-machine
US633028 *Aug 23, 1898Sep 12, 1899Frank McdonoughFeed-works for resawing-machines.
US1360769 *Oct 23, 1919Nov 30, 1920Lewis Harry ACentering apparatus for roller-tables
US1716107 *Jun 8, 1927Jun 4, 1929Bridges George WSaw-adjusting device
US1840778 *Jan 28, 1930Jan 12, 1932Hesse Ersted Iron WorksResaw setworks
CH203498A * Title not available
NO12288A * Title not available
NO72145A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3187788 *Dec 1, 1961Jun 8, 1965Marion Ferrari ArthurBand saw
US7297166Jun 25, 2003Nov 20, 2007Depuy Products, Inc.Assembly tool for modular implants and associated method
US7582092Jun 28, 2004Sep 1, 2009Depuy Products, Inc.Assembly tool for modular implants and associated method
US8419799Oct 23, 2007Apr 16, 2013Depuy Products, Inc.Assembly tool for modular implants and associated method
US8518050Oct 31, 2007Aug 27, 2013DePuy Synthes Products, LLCModular taper assembly device
Classifications
U.S. Classification83/422, 144/253.1, 83/432, 83/437.4
International ClassificationB27B25/02, B27B25/00
Cooperative ClassificationB27B25/02
European ClassificationB27B25/02