US2642902A

US2642902A - Planing attachment for jointers

Info

Publication number: US2642902A
Application number: US224577A
Authority: US
Inventors: Carey Eric Lee
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-05-04
Filing date: 1951-05-04
Publication date: 1953-06-23
Anticipated expiration: 1970-06-23

Description

June 23, 1953 E. L. CAREY 2,642,902

2 PLANING ATTACHMENT FOR JOINTERS Filed May 4, 1951 2 Sheets-Sheet l lll INVENTOR. r'z'c L. aarey June 23, 1953 E. L. CAREY 2,642,902

PLANING ATTACHMENT FOR JOINTERS Filed May 4, 1951 2 Sheets-Sheet 2 Patented June 23, 1953 UNITED STATES ZPATENT OFFICE I r 2,642,902 PLANING ATTACHMENT FOR JOINTERS Eric Lee Carey, Ottawa, Ontario, Canada I Application May 4, 1951, Serial No. 224,577

. Claims.

This invention relates to woodworking. machines.

' In most small woodworking shops, and particularly in home workshops, the need for both jointing and planing operations frequently arises. However, since the cost of power-driven planers and jointers is high, many such workshops are equipped with jointers only and have no facilities for power planing.

It is an object of the present invention to provide a simple and inexpensive attachment for a jointer, such attachment being subject to convenient mounting on an existing jointer and being capable of rendering such jointer suitable for performing planing operations in a highly satisfactory manner.

The invention will be described with reference to the accompanying drawings, in which,

Fig. l is a side elevation of a jointer equipped with the attachment of the present invention,

Fig. 2 is an enlarged sectional side elevation of a portion of the attachment,

Fig. 3 is a plan View of the attachment,

Fig. 4 is an enlarged sectional elevation of an alternative form of supporting means for the attachment," and Fig. 5 (sheet 1) is an enlarged sectional view of an alternative form of another supporting means for the attachment.

In the drawing, the jointer shown is of standard construction and includes a base I, on which are slidably mounted the two bed sections 2 and 3, each adjustable for height by means of a respective hand wheel 4. The cutting head is diagrammatically indicated at 5.

The attachment of the present invention comprises a bed plate 6 mounted on posts I (preferably four in number) which are arranged to be anchored in bed section 2 of the jointer and which are adapted to support th plate in aborizontal plane and in elevated spaced relation to the surface of such section by the posts. The bed plate is preferably formed of metal of sufficient thickness, to impart rigidity thereto. A one quarter inch metal plate has been found satisfactory-for the purpose. The plate may vary in size within wide limits. However, a plate approximately 24 inches long by 12 inches wide provides satisfactory operation for general use.

One end of the plate is adapted to extend in elevated spaced relation over the head 5 and adjacent portion of the other bed section 3. Suspended from the latter end of the plate, as by a pair of rods 8, is a pressure plate 9 in generally parallel relation to plate 6. The plate 9 is of approximately the same width as plate 6 and may be approximately nine inches long.

It will be observed that the major portion of the plate 9 (for instance, about six inches thereof) underlies bed plate 6, the inner edge thereof being arranged to lie in proximity to the cutting head 5. Such inner edge is preferably provided with a depending reversely inclined flange II], which constitutes a deflecting apron for shavings and the like. The outer end portion of pressure plate 9 extends preferably somewhat beyond the adjacent end of bed plate 6. The edge of such outer end is preferably downwardly inclined to provide a lip II, and a complementary lip 12 is formed on the adjacent edge of bed plate 6 to facilitate insertion of a board (as indicated at [3) therebetween.

The pressure plate 9 is arranged to normally lie at a distance from bed plate 6 approximately equal to the spacing of bed plate 6 from bed section 2. However, on insertion of a board between such plates of a thickness greater than said distance, the pressure plate 9 is adapted to move downwardly sufficiently to permit such insertion and'to exert apressure on the lower face of the .board to hold the upper face ofgthe board under pressure against thelo'wer surface" of bed plate 8. To this end, a bushing M is provided on each rod 8, the lower end of the bushing engaging the plate 9 and the upper end being engaged by a spring [5 retained in place by a nut I6 threaded onto the upper end of rod 8. It will be apparent that the nut [6 may be adjusted to vary the pressure applied through the spring by the plate 9.

In order to accommodate various thicknesses, of boards, it is advisable that means be provided to adjust the distance between the bed plate 9 and bed section 2 and cutting head 5 and also to correspondingly adjust the distance between bed plate 6 and pressure'plate 9. Such means may compris -a sprocket ll threadedly mounted on each post 1. Each sprocket has a recessed hub portion I8 which extends through the bed plate and is removably lockedtherein by means of a washer l9 and spring ring 20. The under surface of thebed plate may be suitably countersunk as indicated at -21 to receive the washer and spring ring. Sprockets I1 are likewise threadedly mounted on bushings I4 of the rods 8. A sprocket chain 22 ismounted on the sprockets ll, idler rollers or the like 23 and 24 being preferably provided on the bed plate to engage the chain between rods 8 and adjacent posts 1 to provide more effective driving engagement of the chain W th the sprockets. Roller 23 is preferably carried by a slotted arm 25 mounted on a support 28 carried by the bed plate. The position of the arm 25 may be adjusted by means of bolt 26 and wing nut 21 to impart tightening action to the chain. Bushings l4 are connected by a rod I4 to prevent turning movement of the bushings. One of the sprockets I! (as shown, that on post 1 adjacent roller 23) is provided with a crank arm 29 which may be manually revolved to rotate all sprockets II simultaneously. It will be apparent that rotation of the sprockets in one direction will cause the bed plate to move upwardly and the pressure plate to move downwardly due to the threaded connection with the posts 1 in the one case and the threaded-connection with the bushings I4 1n the other case, the diameter of the posts 1 and bushings l4 and the size of threads thereon being so chosen as to provide equivalent movement of each plate.

Figure 4 illustrates an alternative sprocket mounting for the bushing 14. As shown, a sprocket 30 has threaded engagement with the bushing which extends through an opening 3| in the bed plate 6. The hub 32 of the sprocket is seated on the bed plate and is supported by a suitable bearing 33 mounted on the plate. A bracket 34 retains the sprocket in position while permitting rotation thereof.

Figure illustrates an alternative sprocket mounting for the post 1. As shown, a sprocket 35 has screw threaded engagement with a bushing 36 which extends through the bed plate 6 and has a retaining shoulder 31 engaging the under surface of the plate. fixed in position on the bushing by means of a set screw 38. The bushing is threadedly mounted on the post I.

In operation, the

plates

6 and 9 are adjusted to any desired position to plane a board of specific thickness, the board being eiTeotively held against the bed plate 6 by the pressure plate 9 to provide a satisfactory planing operation by the cutting head 5. Moreover, such planing operation may be carried out in a very rapid manner.

I claim:

1. A planing attachment for a jointer having a pair of bed sections and a cutting head comprising a bed plate, a plurality of supporting posts for the bed plate, the lower ends of said posts bein arranged to be anchored in one of said bed sections, said posts being adapted to support the bed plate in spaced parallel relation to said bed sections with one end portion of the bed plate in overlying relation to the cutting head and other bed section, a pressure plate, rods suspending said pressure plate from said end portion of the bed plate, springs carried by the rods and urging the pressure plate towards the bed plate, rigid spacing means between said plates to normally hold said pressure plate in a position in spaced, parallel, underlying relation to the bed plate and arranged to overlie said other bad section, said rods being slidably mounted in the bed plate to permit movement of the pressure plate out of said position away from the bed plate, and means for simultaneously adjusting said position of the pressure plate and the position of the bed plate with respect to the sts. 2. A planing attachment as defined in claim 1, the edge of said end portion of the bed plate and The sprocket is the adjacent edge of said pressure plate each having an outwardly flared lip to facilitate the insertion of a board therebetween.

3. A planing attachment as defined in claim 1, the inner edge of said pressure plate having a downwardly extending flange constituting a shavings deflecting apron.

4. A planing attachment for a jointer comprising a rectangular bed plate having a workengaging bottom surface, said bottom surface lying in an uninterrupted plane and extending longitudinally from end to end of the bed plate, a plurality of supporting posts mounted in the bed plate laterally of said work engaging sur-- face, a rectangular pressure plate carried by the bed plate independently of said supporting posts and having a work-engaging upper surface in spaced, parallel, relation to said bottom surface and in directly opposed relation to at least a portion of said bottom surface, said upper surface lying in an uninterrupted plane and extending longitudinally from end to end of said pressure plate, means holding said pressure plate in a position at a predetermined distance from the bed plate and restraining movement of the pressure plate towards the bed plate, said means permitting movement of the pressure plate away from the bed plate, resilient means carried by said holding means and urging the pressure plate towards the bed plate to hold work between said work-engaging surfaces, and means for varying said position of the pressure plate and for varying the position of the bed plate with respect to the posts.

5. A planing attachment for a jointer comprising a rectangular bed plate having a workengaging bottom surface, said bottom surface lying in an uninterrupted plane and extending longitudinally from end to end of the bed plate, a plurality of supporting posts mounted in the bed plate laterally of said work-engaging surface, a rectangular pressure plate having a workengaging upper surface, said upper surface lying in an uninterrupted plane and extending from end to end of said pressure plate, rods suspending the pressure plate from one end portion of the bed plate with said upper surface in spaced, parallel relation to said bottom surface and in directly opposed relation to at least a portion of said bottom surface, springs urgin the pressure plate towards the bed plate to hold work between said work-engaging surfaces, rig-id spacing means between said plates to normally hold said pressure plate in a position at a predetermined distance from the bed plate, said rods being slidably mounted in the bed plate to permit movement of the pressure plate out of said position away from the bed plate, and means for simultaneously adjusting said position of the pressure plate and the position of the bed plate with respect to the posts.

ERIC LEE CAREY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 107,346 Douglas Sept. 13, 1870 296,552 Gardner Apr. 8, 1884 851,302 McClune Apr. 23, 1907 2,525,894 Graham Oct. 17, 1950