US2758617A

US2758617A - Adjustable guide fence for jointer

Info

Publication number: US2758617A
Application number: US246422A
Authority: US
Inventors: William S Taylor
Original assignee: Rockwell Manufacturing Co
Current assignee: Rockwell Manufacturing Co
Priority date: 1951-09-13
Filing date: 1951-09-13
Publication date: 1956-08-14
Anticipated expiration: 1973-08-14

Description

Aug. 14, 1956 w. s. TAYLOR ADJUSTABLE cum: FENCE FOR JOINTER 6 Sheets-Sheet 1 Filed Sept. 13, 1951 J J v m H 8.141% W m 2 WW IN VENTOR WILLIAM S. TAYLOR BY M ww ATTOR NE Y5 Aug. 14, 1956 w. s. TAYLOR 2,75,617

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 13, 195.1 6 Sheets-Sheet 2 1N VENTOR.

WILL IAM 5. TAYLOR ATTORNEYS Aug. 14, 1956 w. s. TAYLOR ADJUSTABLE aum FENCE FOR JOINTER 6 Sheets-Sheet 5 Filed Sept. 13, 1951 R O T m V m WILLIAM S. TAYLOR BY M, m

ATTORNEYS 4, 1956 w. s. TAYLOR 2,758,617

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 13, 1951 6 Sheets-Sheet 4 -Z 226 we I /76 Z 7? /60 /88 2/3 /74 l /52 2/4 g My k6 m 222 I Q 204 I fir? X 2 2 INVENTOR W\LL\AM 5. TAYLOR ATTORNEY:

Aug. 14, 1956 w. s. TAYLOR 2,753,517

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 15, 1951 6 Sheets-Sheet 5 BY W WQ ATTORNEYS 4, 1956 w. s. TAYLOR 2,758,617

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 15, 1951 6 Sheets-Sheet 6 zaa 254 35 f I W I 90 268 ,2 g j 306 S w 22 2 ,274

INVENTOR WILUAM S. TAYLOR ATTORNEYS United States atent O 2,758,617 ADJUSTABLE GUIDE FENCE FOR J OINTER William S. Taylor, Three Lakes, Wis., assignor to Rockwell Manufacturing Company, Pittsburgh, 1321., a corporation of Pennsylvania Application September 13, 1951, Serial No. 246,422 Claims. (Cl. 144-253) The present invention relates to improvements in machine tools and more particularly to improvements on the construction and arrangement of wood working machines of the type known as jointers.

The primary object of the present invention is to provide a novel jointer of an improved construction and arrangement which facilitates adjustment and operation thereof and which greatly reduces the possibility of injury to the operator during such operation and adjustment.

In adjusting and operating jointers of the prior art, it has been necessary for the operator to stoop down to read the scales for the various adjustments, to move from place to place about the machine to effect these adjustments and to expose himself to unguarded portions of the cutter knives during many of such operations. The necessity of frequently moving around the machine and stooping to read the scales thereof in making the necessary adjustments results in addition in lost time and mo tion of the operator, increases the rapidity with which In accordance with this important object of this in vention, it is an ancillary object thereof to provide a work guide mounting for a jointer of such construction that lateral and angular adjustments of the fence position can be rapidly and accurately made by an operator without danger of injury while standing in his normal operating position.

A further ancillary object of this invention is to provide a new and improved mechanism for adjusting the vertical position of the work support table of a jointer which is of such construction and arrangement that adjustment of the depth of cut may be efiected with little effort by an operator standing in substantially erect operating position at one end of the jointer.

An equally important ancillary'object of this invention is to provide an improved arrangement for shielding the jointer head by which the cutter head is guarded in all adjusted positions of the lateral work guide so that the various jointer adjustments can be made without danger of injury to the operator.

It will be recognized by those skilled in the art, that many of the features of the present invention herein disclosed as of primary importance are equally applicable to heavy duty and lighter jointer constructions.

In heavy duty jointers, it is customary to support the lateral work guide centrally of its length, rather than at one end as in the smaller capacity machines to avoid duly long unsupported work guide lengths which would deflect under load.

In the prior art, base extensions and work guide mounts each at least equal in length to the overall necessary lateral adjustment of the work guide have been provided in the mounting of such centrally supported lateral work guides. Such mountings result in an undesirable increase in the overall size of the machines. To overcome this disadvantage of the prior art devices it is a further important object of the present invention to provide an improved mounting and adjusting mechanism for centrally supported jointer lateral work guides which is of such construction that a fence may be supported upon a base extension which is approximately one half the length of the necessary lateral adjustment of the Work guide, and by which locking and unlocking of the fence may be effected rapidly and with minimum effort.

In the angular adjustment of work guide fences, it is preferable that the lower edge of the fence rest upon the work support surface and the fence be firmly locked in its position after adjustment so that no play exists between the fence and work support table which could produce inaccuracies in the cutting operations performed. In order that the lower edge of the fence be so positioned, it is necessary to provide for movement of the fence pivot axis, as well as angular movement of the fence about its pivot axis during the fence adjustment movement. In prior art fence mounting structures, individual adjustments and locks have been provided for each of these separate fence movements. Individual manipulation of the operating and locking mechanisms is thus required, and, in certain instances, final adjustment can only be made by successive approximations of such adjustment.

It is a further object of this invention to provide an angular work guide fence adjusting mechanism by which the necessary adjustment of the fence about its pivot axis and of the pivot axis relative to the work support surface can be made simultaneously by but one operating linkage and by which a single locking device is effective to lock the fence in its adjusted position to eliminate all angular movement of the fence.

More specifically it is an object of this invention to provide an angular position indicating device for an angularly adjustable lateral work guide which is of an improved construction by which the angular position indication is independent of the adjusting mechanism so that play in such adjusting mechanism resulting from wear or manufacturing tolerances does not effect the accuracy of the indication.

It is a further object of this invention to provide a jointer with a novel guard structure for shielding the cutter head of the machine which is effective to prevent injury to the operator by the cutter head during operation and adjustment of the machine regardless of the laterally adjusted position of the work guide.

A still more specific object of this invention is to provide an improved mechanism for mounting and resilient- 1y biasing a pivotal cutter head guard by which the biasing torque applied to the guard can be easily adjusted and which is of such construction and is so located that it does not interfere with the adjustment of the depth of cut or the visibility of the indicator for such adjustment.

The foregoing and other objects of the present invention will become more fully apparent by reference to the appended claims and to the following detailed description when read in connection with the accompanying drawings wherein:

Figure 1 is a side elevational view of a jointer embodying the improved structural features of the present invention with certain portions of the table and fence broken away;

Figure 2 is a plan view of the jointer of Figure 1, similar parts being broken away;

Figure 3 is a vertical sectional view taken substantially along the line 3-3 of Figure 1;

Figure 4 is a fragmentary sectional view of the front greater? 3. work support table adjusting mechanism takenalong the line 4-4 of Figure 1;

Figure is a fragmentary sectional view of such mechanisnr taken along the line 5 -5 of- Figure 1;

Figure 6 is an irregular fragmentary sectional view of such mechanism taken along the line 66 of Figure 5;

Figure 7 is an enlarged fragmentary plan view of the work guide" and work guide mounting structure;

Figure 7A is a plan view of the pivot link of the workguide mounting structure of Figure 7;

Figure 8 is a vertical sectional view taken along the line 88 of Figure 7;

Figure 9 is" avertical sectional view taken along the line 9-9 of Figure 7;:

Figure 10 is a vertical sectional view taken along the line 10-10 of Figure 7 and showing the work guide angular adjustment indicating mechanism;

Figure 11 is a vertical sectional view of the pivotal cutter head guard mount taken along' the line 11-11 of Figure 2; and

Figure 12 is a horizontal sectional view taken along the line 1212 of Figure 11 The improved jointer ofthe present invention is shown in Figure l in a side elevational view, being viewed from the side at which the operator stands while operating the machine. As therein shown, this jointer assembly comprises a supporting cabinet 20, in which the jointer drive motor 22 is mounted,- a main jointer base 24 mounted centrally of the top of cabinet 20; a front work support table 26 and a rear work support table 28, both of which are mounted on the main base 24 for translatory movement relative thereto along vertically inclined guideways, an adjustable work guide fence assembly 30; and a cutter guard 32 pivotally mounted upon a rabbeting arm 34 carried by the front work suport table 26. The present invention provides an improved arrangement and construction for jointers by which the operator may make and look all adjustments of the fence and of the support table while standing in his normal operating position beside the machine and without danger of injury to himself.

Cabinet structlme The cabinet 20, within which the motor 22 is mounted, is of an improved construction, rendering it economical to manufacture andassemble, readily accessible for adjustment of the motor mounting, and pleasant in appearance; The cabinet 20 is formed of a top member 36', of generally rectangular form preferably formed of castiron and from each corner of which depends a vertical leg 38. Legs 38 are also preferably formed of cast iron and are suitably secured to the top member 36, such as by screws 40. A pair of longitudinal tie bars 42 and- 44, conveniently formed of angle iron material and shown best in Figure 3, join respectively, the bottom ends of the left side pair of legs 38 and the bottom ends of the right side pair of legs 38, being suitably secured thereto through screws 46 at their opposite ends. Longitudinal tie bars 42 and 44 are joined by a pair of transverse tie rods 48 and 50 (Figure 1), which are in the form of cylindrical shafts secured at their ends to the longitudinal tie bars by screws 52. threaded into end opening tapped bores therein. The cabinet forms a very rigid support, and, having a cast'iron top member 36 and cast legs 38, absorbs much of the vibration resulting from operation of the joiuter. A

The

transverse tie rods

48 and 50 also provide a rigid structure upon which the drive motor 22 can be adjustably mounted. The motor 22 is mounted upon a pair of identically formed longitudinaly extending strap bars 54 and 56 (Figure 3) the longitudinal configuration of which is best shown in Figure 1,. through bolt and nut assemblies 58. Sleeves 60 and 6]., which are rotatably and axially slidably mounted on tie bar 48 are secured, respective, to a pair of adjacent ends of

members

54 and 56 as by Welding. An eye bolt 62 is secured to theother end of each of

members

54 and 56, the shanks thereof extending throughsuitable apertures formed through the

members

54 and 56 and being axially fixed relative thereto between lock nuts 64 and 66. The loop of each of the eye bolts 62 closely surrounds the cylindrical tie rod 50, being rotatable and axially slidable relative thereto. By this construction, motor 22 may be pivoted about the shaft 48 and locked in its adjusted pivotal position by nuts 64 and 66 thus providing a means for adjusting the tension of the belts driven thereby. The transverse position of the motor 22, relative to tie

rods

48 and 50 is fixed by a pair ofcollars 68 and 70, secured to tie rod 48 intermediate sleeves 60 and 6]. by suitable set screws 72 as to axially abut the inner ends of sleeves 60 and 61.. By release of set screws 72, motor 22 may be shifted transversely of the base structure 20 along rods 48 and S0, and fixed in any desired adjusted position by resecuring collars 68 and 70 to the rod 48. By this motor mounting construction, motors of different size and manufacture may be readily mounted on

rods

48 and 50 and can be shifted transversely and pivotally rotated about the tie rod 48 for proper alignment of the motor and proper tension of the drive belt.

The sides of the cabinet between legs 38 are preferably closed by a plurality of cover panels 74 secured to suitable flanges provided on legs by screws 76. The panels 74 may be formed with louvers (not shown) to permit the circulation of air through cabinet 20 to cool motor 22, is desired. A chip chute is provided in cabinet 20 by a transverse plate 78 sloping downward from top casting 36 at a point 79 ahead of the cutter head to the rear panel 74 for the direction of chips and dust thrown. downwardly from the cutting head from an opening 80 (Figure 3) formed through the top member 36 above the chute toward an opening provided in the rear panel to permit discharge of the chips.

Table structure and cutter head mounting The base 24 of the jointer is fixed on the top of the cabinet structure just described by suitable securing means (not shown). A cylindrical cutter head 82 is journalled centrally of the ends of base 24 for rotary movement about a transversely extending axis lying in the vertical transverse center plane of base 24 which slopes downwardly from the approximate horizontal center plane of the cutter head to provide inclined table guide ways 84 and 86. The tables 26 and 28 are mounted upon base 24 for translatory movement relative thereto along these guides ways 84 and 86 respectively and at their opposing inner ends are undercut as indicated at 87 to extend over the cutter heads and define a cutter head opening therebetween. The translatory movement of tables 26 and 28 effects vertical adjustment of the top planar work support surfaces 88 and 90 respectively relative to the cutter head 82, the undercut table ends being" of a configuration to cover the cutter heads in all positions of adjustment except for the portion required to'' be exposed to secure the desired depth of out (see Figure 1). j

The cutter head and cutter head bearing mounting construction is best shown in Figure 3. As shown in Figure 3, the base 24' is a generally hollow casting having

side walls

94 and 96 joined by a pair of transverse webs 98 and 100 spaced outwardly from the vertical central plane. Coaxially aligned semi-cylindrical bearing seats or cradles 102 and 104 (Figures 1 and 3) are suitably machined in the center of the top edges of

side Walls

94 and 96 re speotively'. Cylindrical bearing housings 106 and 108 having cylindrical bearing recesses therein, flat top surfaces 110 and 112 and a configuration adapting them to fit in cradles 102 and 104 are respectively and rigidly secured therein by

bolts

114 and 116 which extend upwardly through

enlarged wall bosses

118 and 120 and threadedly engage suitably aligned, tapped holes formed in the bottom of the housings 106 and 108.

Cutter head 82- .has a pair of coaxially aligned shaft sections 122 and 124, one projecting from each end thereand 132 to permit the pulley shaft section, 124 in the illustration, to protrude beyond the walls of base 24. The opposite opening 131 is preferably closed by a plug 133 to seal the bearing recess from outside dust, etc. The cutter head 82 is, thus, journalled for rotation at the top of base 24 about a transversely extending axis normal to the

base side wall

94 and 96. i

The outboard end of shaft 124 projecting through coaxially aligned bore 131 in housing 108 has a double sleeve pulley 138 secured thereto by a key 140. The cutter head 82 is driven from motor 22 through a pair of V- belts 142 which extend between pulley 138 and a double sleeve drive pulley 144 aligned therewith and keyed to the motor shaft 146.

The cutter head may be removed for adjustment or sharpening of the blades thereof by removing the

bolts

114, and 116, and disengaging the V-belts 142 from pulley 148. For this purpose, the lower edge of the

sidewalls

94 and 96 of base 24 are recessed as indicated at 150 permitting access to

bolts

114 and 116. The bearing housings 106 and 108 are thus freed from their cradles 102 and 104 on the base 24 so that the whole cutter assembly 82, the bearings 126 and 130, and their housings 106 and 108 may be lifted from the base 24 as a subassembly.

This cabinet structure and motor mount is more fully disclosed and claimed in copending application Serial No. 250,345 of Richard A. Buttke entitled Planer and Attachments Thercfor, owned by applicants assignee and filed October 8, 1951, and for this reason no claims to this subject matter are contained herein.

Work support table mounting Tables 26 and 28, as previously indicated, are mounted on base 24 for translatory movement along inclined guideways 84 and 86 respectively, so that the elevation of their planar

work support surface

88 and 90 can be adjusted vertically relative to the cutter head 82. As shown in Figure 4'; which is a fragmentary transverse section normal to the plane of table movement 84 and to the direction of movement of table 26, being taken along the line 4-4 of Figure 1, table 26'is guided for inclined translatory movement toward the cutter head 82 relative to base 24 by the coaction of machined planar V-gu'ideways 151 and 152 of the left side wall 154 of table 26 with parallel machined planar V-

guideways

158 and 160 on the base 24, and of V-guideway 166 of the right side wall 168, with parallel V-guideway 174 of base 24 and an elongated gib 176 interposed between the surface 177 and V-guideway 178 and engaging way 174. These surfaces all extend in the direction of translatory movement of the table 26 relative to the base 24 to form dovetail guideways. Gib 176 is provided near one end with a conical recess which receives the conical end of an adjusting screw 179. This construction, together with an additional spaced set screw (not shown) adapted to abut the outer face of gib 176, provides an adjustment for taking up the lateral play between the base 24 and the table 26 to assure a free sliding but accurate support for the table and accommodate for wear. When it is necessary to take up any lateral play resulting from wear of the engaged surfaces, the screw 178 and its associated abutment screw are screwed in to move the gib 176 toward the surface 172 and thus eliminate such play.

The movement of table 26 relative to base 24 along these guideways is controlled by a combination feed screw and bell crank linkage now to be described. As shown best in Figure 6, a boss 182, having a bore 184 formed therethrough, is formed on the under side of1a transversely extending wall 185 of base 24. A pivot pin 186, having an enlarged upper portion 188 is mounted in bore 184 being fixed therein by a nut 190 threaded onto its lower end. A boss 192, which is integrally formed on the underside of the top of front table 26, is provided with a threaded bore 194 in which the threaded end 196 of a pivot pin 198 is received.

As is best shown in Figure 5, which is a fragmentary sectional view taken along the line 5-5 of Figure 1 showing the table raising and lowering mechanism, pin 198 is the fixed pivot on table 26 by which a bell crank 200 is mounted while the enlarged end 188 of pin 186 forms a pivot fixed to the base 24 with which the bell crank is rockably and slidably engaged. The

side walls

154 and 168 of front table 26 are formed, respectively, with aligned

bores

202 and 204 in which the ends of a shaft- 206 are journalled, a support bushing 207 being provided in bore 202. The central portion of shaft 206 is threaded as shown at 208, and an externally cylindrical nut 210, formed with coaxially opposed protruding

pins

212 and 213, is threadedly received on the threaded portion 208 of shaft 206.

Bell crank 200 has two mutually

perpendicular arms

214 and 215. The end of arm 214 is in the form of an axially opening slot while the end of arm 215 is in the form of a yoke 216a, which partially straddles the cylindrical nut 210, the

pins

212 and 213 being received in axially opening slots of the respective yoke arms. The end 188 of pin 186 is received in the end slot of arm 214.

Raising and lowering of the front table 24 is effected by rotation of the shaft 206 through a suitable handwheel or crank arm 217 fixed to the end thereof exteriorly of the wall 154, as is shown in Figure 4, by key 218 and set screw 219. When the shaft 206 is rotated, the nut 210, being held against rotation between the upper and lower yoke arms of bell crank arm 215, moves axially along threaded shaft portion 208.

Pins

212 and 213, which rockably and slidably engage the end slots of the opposed arms of yoke 216a, cause the bell crank 200 to rock about pin 198 relative to table 26 as the nut 210 moves axially of shaft 206. The pin 186 being rigidly secured to the base 24 and rockably and slidably engaged with the end slot ofbell crank arm 214, rocking movement of the bell crank 200 about pin 198 tends to pivot the bell crank about pin186. Since pin 198 as well as shaft 206 and nut 210 are relatively fixed to the front table 26, this pivotal movement ofbell crank 200 about pin 186 moves table 26 along the inclined plane of base 24 on the dovetailed guideways. The arm 215, as illustrated, is approximately twice the length of arm 214 so that the mechanical advantage of the screw and nut mechanism is doubled. This greatly facilitates movement of the table by the handwheel 217 which also affords a mechanical advantage.

An adjusting mechanism, like that just described in relation to table 26, is used for adjustment of the rear table 28 along plane 86, the translatory movement of table 28 being controlled by identical dovetailed guideways as table 26.

The end of the shaft 206, opposite to that to which the handle 217 is secured, is provided with means for locking the shaft 206 in a fixed position relative to the table 26 after an adjustment has been made. For this purpose, a pair of opposed transversely directed

lock dogs

220 and 221, the outer ends of which are machined fiat and the inner ends of which are hemispherical, are received in a diametrally extending bore 222 of shaft 206. A screw 224 having a conical inner end is threadedly received in end bore formed coaxially in the end of shaft 206 and intersecting bore 222. When the screw 224 is threaded into the end of the shaft 206, the conical inner end bears against the hemispherical ends of dogs 220 and forces them radially outward of bore 222 into frictional engagement with the wall of the bore 204 to prevent relative rotation between the shaft 206 and the table 26.

7 Anoperating handle or knob 2'26-is suitably fixed to the end of screw 224 to facilitate manipulation thereof, at least for the from table which is frequently adjusted to vary the depth of cut. Since the rear table 28 usually remains in a relatively permanent adjusted position, the screw 224 on the rear table locking means need not be provided with such a handle.

Referring now to Figures 1. and 6, the base 24 has cast into its inclined edges on the operating side of the machine adjacent table 26 an elongated depression 228 having a planar surface inclined both longitudinally and transversely of the base 24. A flat graduated scale 230 is secured to this inclined planar surface by screws 232. A cooperating pointer 233 is secured to the exterior side Wall 154 of front table 26 in position above scale 230 by screw 2'34 and coacts with scale 23%) to provide an indication of the vertical distance of work surface 88 of table 26 below the cutting plane of cutter head 82. Scale 230 is graduated to indicate, in fractions of an inch, the depth of out which, of course, is dependent upon the adjustment of the height of the front table 26.

As the front table 26 is moved up or down its guideway, these coacting, relatively movable, angularly disposed, indicating elements will provide an indication of the depth of cut, which is readily visible to the operator while in his normal standing position at the left side of the front table, by which he can conveniently adjust the table to the desired depth of out by manipulating handle 217 while reading the indicated depth of cut upon the scale 230. This adjustment may be performed by the operator while standing in his normal erect operating position without bending his head and body around to the side of the jointer as has been necessary in prior art devices. Minor adjustments of this depth of cutter indicator may be readily effected by loosening pointer securing screw 234 and rotating the pointer in the desired direction around screw 234. In this way, the depth of cut indication may be, within reasonable limits, kept accurate in spite of grinding and honing of the cutter blades.

Adjustment of rear table 28 to maintain it in the cutting plane of cutter head 82 is efifected in the same way as adjustment of table 26.

Work guide fence assembly structure The work guide fence assembly 30 is mounted on the rear support table 28 at the side opposite that at which the operator normally stands, its position being best shown in Figure 2. As will become apparent as this description proceeds, this assembly includes a lateral work guide or fence 235 which extends longitudinally of the tables 26 and 28 and is mounted for adjustment transversely of these tables and for adjustment about a longitudinal axis for varying the angular relation of the fence planar guide surface 236 to the support surfaces 88 and 90 of tables 26 and 28. In the illustrated position, planar surface 236 is normal to surface 88 and 90. The controls by which the position of the fence 235is adjusted and locked are of such construction that they may be easily and rapidly manipulated by the operator to effect the necessary adjustment and are so located that they can be manipulated by the operator from his normal position by reaching across the work support tables. The fence mounting structure and cutter head guard structure are such that these controls can be safely manipulated without danger of possible injury to the operator regardless of the transverse position of the fence to the cutter head.

Referring first to Figures 2, 3, 7 and 8, fence assembly 30 is mounted upon a table extension 238 which is secured to the rear table 28 by screws 240 (Figure 8) on the side opposite that on which the operator normally stands. The top of table extension 238 is a planar surface 242, coplanar with the top surface 90 of the rear table 28. The fence 235 is pivotally mounted on a slidable mount or support 244' by .a pivot link 246 to permit its angular adjustment relative to surfaces 88* and ceived in a mating slot 252 formed across the bottom of a web 253 integral with the support 244.

A mechanism of novel construction is provided for locking the support 244 in a fixed position relative to the table extension 238 and permitting free translatory movement of support 244 through a path, the length of which is approximately twice that of table extension 238 upon which it rests while providing easy manipulation for locking and unlocking the support relative to the table extension 238. This locking mechanism (Figure 8) is formed by an apertured member 254, which is normally free to slide relative to the table extension 238 as well as relative to the support 244 in the direction of movement of the support 244 relative to the table extension 238, and which can be manipulated to frictionally engage members fixed relative to the table extension 238 and to the support 244 to prevent relative movement therebetw'een. Member 254, which conveniently is in the form of an eye bolt, is rotatably supported on the central portion 256 of a shaft 258 journalled for rotation at its opposite ends in aligned bores in the front wall 260, and rear wall 262 of the casting forming the mount 244. The central portion 256 of shaft 258 is cylindrical and eccentric relative to the axis of the journalled ends of shaft 258 so that a one-hundred eighty degree rotation of shaft 258 will shift member 254 from its extreme upper position, as shown in Figure 8, to an extreme downward position. A handle 264 is fixed to the end of shaft 258, exteriorly of the wall 262 to facilitate manual rotation of shaft 258.

The member 254, which depends from the eccentric portion 256 of shaft 258, extends through an elongated slot 266 formed through the top wall 268 of table extension 238. Slot 266 is elongated in the direction of move- 11161112 of support 244 relative to table extension 238. The lower portion of member 254 extends through the slot 266 and is in the form of a threaded shank 270. A clamping bushing 272, having a cylindrical guide portion 274 approximately equal in diameter to the transverse dimension of slot 266 and a radially extending flange portion 276 disposed beneath and larger in diameter than the transverse dimension of the slot 266, is freely rotatably received upon the threaded shank 270 and limited in its downward movement by a pair of

nuts

278 and 280 threaded onto the lower end of the shank 278 below the clamping bushing 272.

When the shaft 258 is rotated so that member 254 is moved toward its upper limit position, the flange portion 276 of bushing 272 is pressed into tight frictional engagement with the peripheral edge 282 of the slot 266 and the member 254 is forced into tight frictional engagement with the eccentric shaft portion 256 so that mount 244 and table extension 238 are rigidly locked against relative movement. When the shaft 258 is rotated sufficiently to lower member 254 and release the flange 276 from engagement with the peripheral edge 282, the support 244 can be shifted freely along its guide rail 248. When the bushing 272 reaches the opposite end of slot 256 and the member 254 reaches the opposite end of the eccentric portion 256 of shaft 258 the forward limit of movement of the fence 234 has been reached. Thus, the path through which the mount 244 and thus the fence 234, can be moved relative to the table extension 238 is approximately equal in length to the sum of the overall length of the slot 266 and the overall length of the eccentric portion 256 of shaft 258. For a given support and table extension length, this is approximately twice the overall lateral fence adjustment attainable in prior art devices.

Pivot link 246, by which the fence 234 IS ptvotally mounted on support 244, has, as is best shown in Figure 7a, two

parallel side walls

284 and 286 and an intermediate wall 288 parallel thereto. These three walls are integrally joined by a transverse top wall 290 extending across the rear portion of the top thereof. Through the upper forward ends of

walls

284, 286 and 288 coaxially aligned

bores

292, 294 and 296 are formed, and an upper pivot shaft 298 is rotatably received therethrough. Through the lower rear ends of

walls

284, 286, and 288 are formed coaxially "aligned bores 300, 301 and 302 which rotatably receive a lower pivot shaft 304 the axis of

shafts

298 and 304 being parallel.

Lower pivot shaft 304 is also supported between a pair of

arms

306 and 307 formed as integral extensions of the mount 244 on its face adjacent the fence 234. The faces of

arms

306 and 307 are formed respectively with coaxially aligned arcuate recesses 308 and 309 (Figures 7 and in which the ends of shaft 304 are received, shaft 304 being fixed to these

arms

306 and 307 by

screws

310 and 311. In this manner, pivot link 246 is mounted upon the support 244 for pivotal movement about the axis of shaft 304. I A pair of arms 312 and 313 are formed similarly on the face of fence 234 opposite the work guide surface 236. These arms 312 and 313 are respectively formed with coaxially aligned arcuate recesses 314 and 316 (Figures 7 and 10) in their faces adjacent support 244, the ends of upper pivot shaft 298 being received in these

arcuate recesses

314 and 316 and fixed thereto by

screws

317 and 318. In this manner, the fence 234 is mounted on the pivot link 246 for pivotal movement about the axis of shaft 298.

A mechanism which is best shown in Figures 3 and 7, is provided for rotating the shaft 298 about its axis relative to the pivot link 246 to effect angular adjustment of the fence 234 relative to the table support surfaces 88 and 90. .ln the preferred form, this mechanism comprises a worm wheel sector 320 fixed to the shaft 298 intermediate the

walls

286 and 288 of the pivot link 246, and a worm pinion 322 meshing therewith and forming an integral extension of a shaft 324 journalled for rotation in a bore 325 formed through a tapered boss 326 rising from the upper face of the transverse wall 290 of pivot link 246. The shaft 324 is held against :axial movement through bore 325 by a set screw 328 threaded through the wall of the tapered boss 326, into the bore 325, the end of which engages an annular groove 330 formed around the shaft 324. A knob 332 is fixed to the end of the shaft 324 opposite worm 322 to facilitate rotary manipulation of shaft 324 for effecting pivotal movement of the fence 234 relative to the pivot link 246.

Since the pivot link 246 is freely pivoted relative to the support 244 about the shaft 304, the lower edge 334 of the fence 235 continuously rests upon the Work support surface 90of table 28 throughout the angular adjustment of fence 235. Thus, as the angular position of the fence 235 relative to the pivot link 246 is shifted by rotary manipulation of the shaft 324, the pivot link 246 and the pivotraxis the fence 235 will be continuously shifted in a pivotal manner about the axis of shaft 304 which is fixed .to the support 244. The complete angular adjustment of fence 235 relative to the support surface 290 can, thus, be effected by manipulation of but a single adjusting mechanism.

To prevent movement of fence 235 after it has been adjusted in the foregoing manner, an improved locking mechanism is provided which is effective, upon manipulation, to simultaneously fix the position of fence 235 about the axis of its pivot shaft 298 and to fix the angular position of its pivot shaft 298 about the axis of the pivot shaft 304. This mechanism is best shown in Figures 7 'and 8. A pair of

lock collars

338 and 340, are secured respectively to upper pivot shaft 298 and lower pivot shaft 304 between side wall 284 and intermediate wall 288 of the pivot link 246 by

pins

341 and 342. The transverse wall 290 of pivot link 246 is formed with a 10 boss 344 extending above side walls284 and 288. A- bore 346, in which a clamp stud 348 is journalled, is formed through this boss. The lower end of clamp stud 348 is formed with a cylindrical portion 350 (Figure 8) and a threaded portion 352 upon which, respectively, are received a pair of opposed tapered

wedges

354 and 356.

Wedges

354 and 356 are received between the

walls

284 and 288 of the pivot link 246 and are held against rotation thereby. Wedge 354 bears against a shoulder 358 at the upper end of the cylindrical portion 350 and the cylindrical portion 350 is freely rotatable relative thereto while threaded portion 352 of the clamping stud 348 is threadedly engaged with the wedge 356 so that, upon rotary manipulation of the clamping stud 348, the

wedges

354 and 356 are pulled together so that their tapered surfaces tightly bind against the

lock collars

338 and 340. A lock handle 360 is fixed to the end of clamping stud 348 to facilitate manipulation thereof. The angles of

Wedges

354 and 356 are rather critical in that they should provide maximum amount of mechanical advantage to afford maximum locking action on the

shafts

298 and 304 while at the same time their angle must be large enough to eliminate any tendency toward a self locking action. I have found the optimum angle to be in the order of 25.

Since

collars

338 and 340 are fixed respectively to the upper pivot shaft 298 and to the lower pivot shaft 304, and shaft 298 is fixed to the fence 234 and shaft 304 is fixed to the fence mount 244, rotation of the clamping stud 348 to draw

wedges

354 and 356 into tight engagement with the

lock collars

338 and 340 not only prevents the pivotal movement of the fence 234 about the axis of its pivot shaft 298 but also prevents pivotal movement of the shaft 298 and the pivot link 246 about the axis of lower pivot shaft 304. Thus, by manipulation of but a single locking mechanism, guide fence 234 is securely fixed in its adjusted angular position relative to the work support surfaces 88 and 90.

An improved mechanism has been provided for indicating the angular position of the fence 234 relative to the work support surfaces 88 and 90. This mechanism is of such construction that it is readily readable by an operator standing on the side of the jointer opposite that on which the fence is mounted and provides an accurate indication of the angular position of the fence 234 relative to the work support surfaces 88 and 90 independently of any play that may exist in the mechanism for adjusting the angular position of the fence 234.

This angular fence position indicating mechanism is best shown in Figures 7 and 10. The fixed element of this indicating mechanism is a plate 362 secured as by screws 363 upon a mounting pad 364 on the top of the support 244 formed with an elongated slot 366 extending in the direction of movement of the support 244 relative to the table extension 238. The movable element of this mechanism is a pointer 368 mounted for longitudinal movement through the slot 366 and bent over and formed with a point to overlap a portion of the plate 362 along a peripheral edge of the slot 366 as is shown in Figure 9. Suitable graduations are formed on the plate 362 with which the end of the pointer 368 coacts to provide a readily readable indication of the angular position of the fence 234.

As is best shown in Figure 10, the pointer 368 is fixed at its lower end in a rod 370. Rod 370 is pivotally connected at one end to the rear face of the fence 234 as by a hinge 372 and is supported adjacent its other end by a cylindrical rod 374 extending transversely and having a through, bore 375 intermediate its ends in which rod 370 is fixed as by brazing. Rod 374 is supported at its ends in parallel,

rectilinear guide slots

376 and 377 formed respectively in a side Wall 378 and intermediate wall 380 of the casting forming the support 244.

Referring again to Figure 10, as the angular position of fence 234 is varied, the rod 370 is moved longitudinally relative to support 244 and will pivot slightly about the axis of the transverse rod 374. Rod 374, being fixedto 11 rod 370 will slide along the

guide slots

376 and 377 as the rod 370 is moved. While the pointer 368 will pivot slightly about the axis of rod 374 as the position of rod 370 is varied, the position of the pointer 368 relative to the plate 362 will be constant for any given angular position of the fence 234 relative to the work support surfaces 88 and 90. The graduations formed upon the plate 362 are spaced with this angular variation taken into account to assure accurate position to provide an accurate indication of the angular position of the fence 234. Rod 370 is normally resiliently biased toward the fence 234 by a conical spring 382, which at its smaller end is fixed to the end of rod 370 opposite the hinge 372 by a screw 384 and washer assembly and which, at its larger end, abuts against the wall 262 of the casting of support 244. Spring 382 provides a counter balance effect on the fence 235 to overcome the tendency of the fence 235 to lock itself when it is adjusted to its full 45 back position, that is tothe position in which face 236 forms a 45 acute angle with the top surfaces of the work support tables. A collar 386 is fixed to rod 370 as by a set screw 388 to provide a limit for the longitudinal movement of rod 370 by abutment with the exterior surface of the wall 260 of the fence mount 244.

Cutter Head Guarding A novel cutter head guard arrangement has been provided which is of an improved construction to shield the operator from the rotating cutter head 82 on both sides of the work guide 234, regardless of the transverse position to which the fence 234 is adjusted. This improved guard arrangement is best shown in Figures 2, 11 and 12, wherein it is seen that the fence support 244 and the fence pivot link 246 are of such construction that they form a cutter head guard movable with the work guide fence 234 transversely of the work supporttables 26 and 28 over the non-cutting edge of cutter head 82 so that any portion of the cutter head 82 which is behind the fence 234 is effectively shielded. By this improved construction, manipulation of the several mechanisms provides adjusting the lateral and angular position of the fence 234 may be effected without danger of injury to the operator from the non-cutting portions of head 82.

The portion of the cutter head 82, in front of the work guide fence 234 is shielded by guard 32, which is pivotally mounted upon the rabbeting arm 34 and resiliently biased against the work guide face 236 of the fence 234 in a position over the cutter head 82. The guard 82 is pivotally supported and so formed it abuts the fence 234 just ahead of the cutter in all positions as shown so as to cover all portions of the cutter head 82 in front of the fence 234 regardless of the transverse adjusted position of the fence 234.

The guard 32 is mounted for pivotal movement about the axis of a shaft 390 which extends through the rabbeting arm 34 and the axis of which is normal to the plane of the work. support surface 88. The mounting of guard 32 and of shaft 390 is shown in detail in Figure 11. As therein shown, guard 32 is formed on its lower face with a boss 391 having a bore 392 formed therein. The upper end of shaft 390 is received within the bore 392 by a slightly forced fit, relative movement between the guard 32 and the shaft 390 being prevented by the knurled portion 393 of shaft 390 Within the bore 392.

The rabbeting arm 34 is formed with a hollow cylindrical portion 394 depending from the lower side thereof through which the shaft 390 extends, shaft 390 being rotatably received through a bore 396 in the top wall of rabbeting arm 397. As previously indicated, the guard 32 is resiliently biased about the axis of shaft 390 into engagement with the fence 36. Mechanism forbiasing the guard 32 is provided below the rabbeting arm 34 near the lower end of shaft 390, where it is easily accessible for adjustment of the biasing torque applied to guard 32 and where it does not interfere with the visibility of the front table adjustment indicator.

This mechanism includes a generally hollow cup-shaped member 398 which is mounted for rotation on the underside of the boss 394 around the axis of shaft 390. A torsion spring 400 is enclosed within the member 398 in surrounding relation to shaft 390, having one end fixed relative to the rabbeting arm 34 and the other end fixed relative to the shaft 398 and the member 398. Member 398 is rotatably received in an annular recess 402 defined between a spring retainer washer 404 and an annular retainer ring 406, both of which are secured together and to the underside of the boss 394 in coaxial alignment with the shaft 390 by screws 408. As will become apparent by reference to both Figures 11 and 12, member 398 is formed with an outer, generally cylindrical wall 410, and an inner concentric wall formed by a pair of cylin'

drical segments

412 and 414 integrally joined at their lower ends by a radial wall 415. The shaft 390 extends through the bore defined by the

cylindrical segments

412 and 414 while the spring 400 is received within the annual recess defined between the

cylindrical segments

412 and 414 and the cylindrical wall 410. The upper end of spring 400 is formed with a hooked portion 416, which extends through an aperture 418 formed through the washer 404, so that, at that end, spring 400 is fixed relative to the washer 404 and thus, relative to the rabbeting arm 34. The lowest loop of spring 400 is formed with a diametrally extending portion 420 which, as is shown in Figure 12, is received in the bottom of the diametr'al slot formed between the

cylindrical segments

412 and 414 of the member 398. In this manner the lower end of spring 400 is fixed relative to the member 398. A diametral longitudinally extending slot 422 is formed through the lower end of the shaft 390. When the shaft 490 is in the assembled position as shown the spring portion 420 extends through this slot 422 and thus couples the shaft 390 and member 398 for concomitant rotation. A bore 423 is formed through the lower end of the shaft 390 to receive a lock in the event it is found necessary to prevent unauthorized removal of the guard. In the absence of such a lock, shaft 390 may be lifted axially sufficiently to disengage the spring portion 420 from the slot 422 and thus permit rotation of the member 398 and the spring portion 420 relative to the shaft 390. It is in this manner that the torque applied to the guard 32 and the shaft 390 by the spring 400 may be readily adjusted. After suitable tension is created in the spring guard 32 and the shaft 390 are again lowered into a position in which the spring portion 420 engages the slot 422, to thus recouple the shaft 390, member 398, and the lower portion of the spring 400 for concomitant rotation. As is best shown in Figure 12, grooves 424 are formed longitudinally of the outside of member 398 to facilitate the manual gripping thereof for its rotation.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes Which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letters Patent is:

l. The combination with a work support of an elongated work guide movable over said work support; a work guide mount; coacting rectilinear guide elements on said support and said mount for guiding said mount for translatory movement relative to said support; a member mounted between said mount and said support for translatory movement relative to said support in the direction of movement of said mount relative to said support and for translatory movement on said member; and a lock operable to simultaneously prevent such movement of said member relative to said support and said mount relative to said member.

2. In combination with a machine having table structure defining an elongated work support surface and a work guide extending longitudinally thereof: a work guide support mounted on said table structure for translatory movement transversely of said support surface; means mounting said work guide on said work guide support for angular adjustment relative to said support surface; releasable means for locking said Work guide in its adjusted angular position; and means for indicating the angular position of said fence comprising a pair of coacting relatively movable indicator elements, one of said indicator elements comprising a fiat scale member fixed to the top of said support, and the other of said indicator elements comprising a pivot carried by said work guide, an arm having one end pivotally connected to said work guide pivot and guided on said support at the other end for sliding movement beneath said scale, and a pointer overlapping a portion of said scale and fixed to said indicator arm at its other end.

3. A work guide assembly for a jointer or the like comprising a base adapted for connection to a machine tool table and having an elongated slot therein; a work guide support slidably mounted on said base; a work guide mounted on said support and providing a work guiding surface extending transversely of said guide slot; a shaft mounted at its ends in aligned journal apertures in said work guide support in vertical alignment with the longitudinal axis of said slot and having an eccentric portion extending between its journalled ends; an eye bolt slidably mounted on said eccentric shaft portion with its threaded shank depending through said slot; a nut and washer assembly threadedly secured against axial disassembly on said eyebolt shank with the annular margins of said washer overlapping the under portions of said base defining said slot; and a shaft operating handle secured to said shaft and adapted to rotate said shaft in its journals and move said eccentrically supported eyebolt and nut and washer assembly between clamping and nonclamping engagement with said shaft and said slot thereby permitting translatory movement of said work guide in a direction normal to its length throughout a distance equal to the sums of the length of said slot and the length of said eccentric shaft portion to eifect desired positioning of said work guide assembly with respect to said jointer.

4. The combination defined in claim 3 wherein the work guide is mounted on said work guide support at one end thereof by a link member journalled at its opposite ends on said work guide and said end ofsaid support member and locking means in the form of a shaft journalled in said link and a pair of opposed wedges respectively axially fixedly journalled and threaded on said shaft in overlapping relation to said link journal connections so as to selectively engage said connections is provided for locking said work guide in selected angular relation to a longitudinal axis lying in the lower longitudinal edge of said work guide.

5. The combination defined in claim 4 together with angular adjustment means for said work guide comprising a work shaft journalled in said link and a worm gear segment cooperating therewith and non-rotatably secured to said work guide.

6. A lateral work guide and adjustment mechanism for a jointer having a work support table comprising a support member mounted for transverse translatory movement over the jointer table and a single pivot link pivoted to said support member and said lateral work guide about spaced parallel axes and a torque amplifying irreversible power transmitting mechanism operatively interposed between said lateral work guide and said pivot link whereby angular adjustment of said work guide can be effected with minimum eifort.

7. The work guide and adjustment mechanism of claim 6 together with a locking mechanism comprising a pair of cooperatively coupled opposed wedges carried by said pivot link and operable to fix said lateral work guide to said support member independently of said lateral work guide adjustment mechanism whereby the secured angular position of said work guide is independent of said adjustment mechanism.

8. The work guide and adjustment mechanism of claim 6 together with a locking mechanism for said support member comprising a compound movement locking mechanism including a first member movable relative to both said table and said support member through a limited path in the lateral direction of support member movement and a second member and operating member therefor operable to secure said first member in its adjusted lateral position relative to both said table and to said support member simultaneously whereby large lateral adjustment of said work guide is obtained while said operating member is maintained within the reach of the operator from said normal position.

9. In combination, first and second members adapted for relative pivotal movement to preselected relatively adjusted positions, a link interconnecting said members and pivotable relative to each of said memebrs about spaced parallel pivot axes, an irreversible drive connection and operating member therefor carried by said pivot link operatively interconnecting said pivot link with one of said members for controlling the correlative pivotal positions of said pivot link and said one member, and a structurally independent locking mechanism carried by said pivot link and operable to fix the relative pivotal positions of both of said members and said pivot link.

10. In combination, a first member, a first shaft fixed to said first member, a pivot link mounted upon said shaft for pivotal movement relative to said first member, a second member and second shaft fixed thereto, means mounting said second shaft on said pivot link for pivotal movement of said second member relative to said pivot link about an axis spaced from and parallel to the pivot axis of said pivot link relative to said first member, a worm rotatably mounted upon said pivot link, a wormwheel fixed to one of said shafts in constant meshing engagement with said worm, and means for locking the relative positions of said members comprising a first collar fixed to said first shaft, a second collar fixed to said second shaft in lateral alignment with said first collar, a third shaft rotatably mounted on said pivot link and extending between said collars, and a pair of opposed wedges carried by said third shaft on opposite sides of the plane defined by said parallel pivot axes and so operatively connected to said third shaft that rotary manipulation of said third shaft in one direction is effective to jam said wedges against said collars to prevent relative movement of said first and second members and reverse rotary manipulation of said third shaft is effective to relieve such jamming action of said wedges.

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