US2575250A

US2575250A - Woodworking tool fence supporting structure

Info

Publication number: US2575250A
Application number: US54909A
Authority: US
Inventors: Copp William
Original assignee: Callender Foundry & Manufacturing Co Ltd
Current assignee: Callender Foundry & Manufacturing Co Ltd
Priority date: 1948-10-16
Filing date: 1948-10-16
Publication date: 1951-11-13
Anticipated expiration: 1968-11-13

Description

Nov. 13, 1951 copp 2,575,250

WOODWORKING TOOL. FENCEYSUPPORTING STRUCTURE Filed Oct. 16, 1948 4 Sheets-Sheet l INVE N TOR MILL/AM COP}? NOV, 13, 1951 (:QPP 2,575,250

WOODWORKING TOOL FENCE SUPPORTING STRUCTURE Filed Oct. 16, 1948 4 ShtS-Sht 2 //V VE N TOR W/LU/IM COPP Nov. 13, 1951 w CQPP 2,575,250

WOODWORKING TOOL FENCE SUPPORTING STRUCTURE Filed Oct 16, 1948 4 Sheets-Sheet 5 I N VE N TOR WILL/A M C OPP Nov. 13, 1951 w. coPP WOODWORKING TOOL FENCE SUPPORTING STRUCTURE 4 Sheets-Sheet 4 Filed Oct. 16, 1948 mvm/rm WILL/14M CORP HTTX Patented Nov. 13, 1951 WOODWORKING TOOL FENCE SUPPORTING STRUCTURE 7 William Copp, Guelph, Ontario, Canada, assignor to Callender Foundry & Manufacturing 00., Limited, Guelph, Ontario, Canada, acorporation of Canada Application October 16, 1948, Serial No. 54,909 6 Claims. (01. 144-253) The present invention relates to woodworking tools, and is particularly concerned with improvements in a fence supporting structure for jointers.

It is an object of this invention to provide a J'ointer fence which is mounted in such a manner that the lower edge of the fence will be close to the rear table of the jointer, irrespective of the relative raising or lowering of the front table of the jointer, thereby insuring proper support for the work as it passes over the rear table.

Another object of the invention is the provision of an improved fence for jointers and of an improved mode of support for the fence whereby it may be firmly and rigidly held in any angular position and at different distances from the cutter.

A still further object of the invention is the provision of an improved support for a work fence for a jointer or similar tool which is sturdy, capable of economical manufacture, and simple, so that adjustments may be made quickly and the fence quickly secured in any desired position.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following'specification, taken in conjunction with the accompanying drawings, wherein like characters of reference designate corresponding parts throughout the several views, in which Fig. 1 is a front perspective View of a jointer constructed in accordance with this invention;

Fig. 2 is a rear perspective view of the said jointer, showing particularly the fence mounting means;

Fig. 3 is a rear elevation of the fence mounting means;

Fig. 4 is a top plan view of the fence mounting means;

Fig. 5 is a vertical sectional view of the fence mounting means, taken on the plane of the line 5-5 of Fig. 3, looking in the direction of the arrows;

Fig. 6 is a fragmentary vertical elevational view of the fence mounting means, showing particularly the links in the position which they assume when the fence is vertical; and

Fig. 7 is a fragmentary vertical elevational view of the fence mounting means, showing the links in a position which they assume when the fence is in a tilted position.

Referring to the drawings, l0 designates a jointer base having bearings in which is journalled a cutter-head ll driven in any suitable manner. A front table l2 and a rear table l3 are slidably mounted on theusual-inclined ways I4 and 15 formed on the base Ill, so as to be capable of raising and lowering with respect to the cutter-head. The tables are independently movable by means of any suitable adjusting means,' here shown to include adjusting knobs l6 and ll. The front table [2 is formed at one side with a rabbeting arm or ledge 18, and the rear table I3 is formed at the same side with a grooved edge [9 to provide clearance for rabbeted work.

Extending from the back of the rear table l3 are two parallel fence supporting rods 20 and ill, on which is mounted the fence supporting fixture generally indicated at 22. The fence supporting .fixture preferably comprises a casting having two spaced arms 23 and 24 (Fig. 4), the lower ends of the said arms being provided With

bored enlargements

25 and 26, which are slidably mounted on supporting rods 20 and 2| respectively. A locking handle assembly 21 is provided to prevent undesired sliding movement of the fence supporting fixture on the rods.

In the

arms

23 and 24 are provided

bearings

28 and 29 respectively (Fig. 3), and in the said bearings is journalled a control member for rotation on an axis parallel to the table; The control member comprises ahollow cylinder 30 at the outer end of which are secured

cover plates

31 and 32 by means of lugs 33 and 34 which form an integral part of the cover plates; they extend inside the cylinder and are secured thereto by means of suitable screws. The diameter of the cover plates is somewhat greater than the diameter of the cylinder 30; therefore the cover plates bear against the side-

arms

23 and 24 respectively, and'axial movement of the control means is prevented thereby. Secured to the cylinder and extending radially therefrom is an adjusting handle 35; it is clear that the control means may be rotated in the bearings by grasping handle 35 and moving it in the desired direction.

On the rear face of fence 36 is secured asupporting bar 31 by means of screws 38. To one end of supporting bar 38 are pivotally connected one end of a pair of

crossed links

39 and 40, the other ends of the said links being pivotally connected to the cover plate 3|. Similarly, to the other end of supporting bar 38 are pivotally connected one end of a pair of crossed links 4| and 42, the other ends of the said links being pivotally connected to the cover plate 32.

Since the construction of the two pairs of crossed links and also their pivotal connections to the fence and to the cover plates are identical,

only one pair of crossed-Jinks will be described in detail; reference is made particularly to Figures 6 and 7, in which are shown

links

39 and 40 pivotally connected at one end to the fence by means of

screws

43 and 44, and at the other end to the cover plate 3| by means of

screws

45 and 46. It will 'benoted that link 40 is provided with an elongatedlarcuateslot 41, whereas link 39 is provided with an arouate slot 48 of relatively small radius. These slots provide a pair of inter-::

secting cam-profiles, and through them (as through the corresponding slots-in the other pair. of links 4| and 42) passes a pin or rod 49-, which i also extends through openingsprovideduiri the

arms

23 and 24 of the fencelsupportinglfixturez 22. Moreover. it is obviously "necessary from' a construction standpoint that the rod 49 extend through the cover plates 3| and 32, and there-;

fore arcuate apertures 50 are provided therein.

At one end of the rod 49 is a locknu't assembl-y'5l whereas at the other end is a cam lock handle 52.

A study of Figures 6 and '7 will reveal that the relative dimensions of the links, the locations of theirpivotal connectionson the fence 35 and on the cover plate 35, the cam-profile configurations of the slots 4'! and 4S, and the location of rod 49 are: such that the lower edge of the fence moves in a plane substantially parallel to the plane of the table when the control member isrotated.

To adjust the fence to the desired angle, it is merely necessary 'to release locking handle 52,

and by'gripping handle 35 the operator may turn rangement of parts'may be resorted to, without departing from the spirit of the invention or the scope of the subjoined claims.

What I'claimas my invention is:

1. In a machine tool having a table, means to tiltably mount a fence on the table. comprising a fencesupporting fixture secured to the table, a control. member mounted on the fixture for rotation about an axis'parallel to the table, a pair of links connecting the fence to the control member, one linkhaving an end connected to the upper part of the fence and the other end connected to the lower part of the controls member, the other linkihavingzanend connected to the lower part of the'fence and the other end connected to theupper part of the control member, the said links thereby.crossingpeach other, and guide means secured to the fixture, each link having an arouate cam-profile slidably supported by the guide means for all the:relative positions of the links produced byrotation of the control member, the said cam-profiles intersecting and the guide means defining the point of intersection whereby when the control member is rotated the fence is tiltedin .a path predetermined by the configuration of the said cam-profiles with respect to the locations of the connections of the links to thecontrol member andthe location of the guide means;

2. In a machine tool having a table, means to tiltably mount a fence on the table comprising a fence supporting fixture secured to the table, a control member mounted on the fixture for rotation about an axis parallel to the table, a pairof crossed links connecting the fence to the control member, each one of the said links having one end pivotally connected to the fence and the other end pivotally connected to the control memher, an arcuate slot in each link crossing the slot in the other link,-the slots providing a pair of intersecting cam-profiles,.-aa pin on the fixture extending through both the slots and defining the point of intersection of the cam-profiles for all the relative positions of the links produced by rotation of the control member, the cam-profiles in the links slidably engaging the said pin andthe fence thus "being tiltable when the controlrimeansuis rotated only in a path predetermined by the configuration of cam-profiles provided by the two-arcuate slots with respect to thelocations of the. pivotal connections of the links and the location of the rod.

3. In "a-machine tool having a table, means to tiltably mount a fence on" the table comprising a fence supporting fixture secured to'the table, a control member mounted on thefixture for rotatation about an axisparallel to the table, a pair of linksconnecting thefence to the control member, one link having an end connected to-the upper part of the fence and the other'end connected--to the lower part of the control member, the other-link having an end: connected to the lower part of the fence and the other-end connected to theu-pper part'of the control member, the said links thereby crossing each other,'a pin on the fixture, an arcuate slot in the first mentioned link, throughwhich passes the pin, an

arcuate slot in the second mentioned link through I which also passes the pin-,the said slots cross ing each other and providing a pair of intersect-.

ing earn-profiles and'the pin defining the point of intersection'oi thecam-profilesfor all therelative positions of the linksproduced lay rotation of the control membergathe said slots-also being of substantially':the same width-asthe diameter. of the pin, the engagement of the pin with the I cam profiles guiding the movement of the links and'the location of the pinbeing such that when the control membcris rotated :the :lower edge of the fence moves in a planesubstantiallyparallel to the plane of the table.z--

4. In a machine tool-having a table, meansto tilt-ably mount a fence on the table comprising-.- a fence supporting fixture secured to the table; a

control member mounted on thefixture for rotation about an axis parallel to the table, a pain of crossed links connecting the fence to the control member, each one of the said links having one end'pivotallyconnectedito the fence and the other end pivotallysconnected to the control member, an arcuate slot in each link-,theslotscrossing each other and providing a pair of inter-F. secting cam-profileaa pin on thefixtureextending through. both:the slots, and defining .thepoint of intersection of the cam-profilesfor all-the1re1+ ative positions of the links produced by-rotation of thecontrol member,- the cam profiles slidably engaging the said pin and the fence thusbeing tiltable when the control means :is rotated. only; in a path predetermined by (the: configuration ofthe two cam-profiles with respect to the locaprevent undesired movement of the fence and adapted when in another position to allow the links to move thereby permitting adjustment of the tilt of the fence.

5. In a machine tool having a table, means to tiltably mount a fence on the table comprising a fence supporting fixture secured to the table and having spaced arms provided with bearings, a control member journalled in the said bearings for rotation about an axis parallel to the table, a pair of crossed links at each end of the control member connecting the fence thereto, each link having an end pivotally connected to the fence and the other end pivotally connected to the control member, an arcuate slot in each link, the slots in each pair of links crossing each other and providing a pair of intersecting cam-profiles, a rod extending through fixed points in the two arms and through both slots in each pair of links and defining the points of intersection of the cam-profiles for all the relative positions of the links produced by rotation of the control member, the cam profiles slidably engaging the said rod and the fence thus being tiltable when the control means is rotated only in a path predetermined by the configuration of the camprofiles with respect to the locations of the pivotal connections of the links and the location of the rod.

6. In a machine tool having a table, means to tiltably mount a fence of the table comprising a fence supporting fixture secured to the table and having spaced arms provided with bearings, a control member journalled in the said bearings for rotation about an axis parallel to the table, cover plates secured to the ends of the control member, the diameter of the said cover plates being greater than the diameter of the bearings and the cover plates thus preventing axial displacement of the control member in the fixture, an arcuate aperture in each cover plate, a pair of crossed links at each end of the control member connecting the fence thereto, each link having an end pivotally connected to the fence, the other ends of the links of one pair being pivotally connected to one of the cover plates and the other ends of the links of the other pair being pivotally connected to the other cover plate, an arcuate slot 1 in each link, the slots in each pair of links crossing each other and providing a pair of intersecting cam-profiles, a rod extending through fixed points in the two arms, through the apertures in the cover plates and through both slots in each pair of links and defining the points of intersection of the cam-profiles for all the relative positions of the links produced by rotation of the control member, the cam-profiles slidably engaging the said rod and the fence thus being tiltable only in a path predetermined by the configuration of the two arcuate slots in each pair of links with respect to the locations of the pivotal connections of the links and the location of the rod.

WILLIAM COPP.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 264,421 Sweet Sept. 12, 1882 2,123,627 Hedgpeth July 12, 1938 2,264,527 Hawkins Dec. 2, 1941 FOREIGN PATENTS Number Country Date 469,671 France May 26, 1914