US2551383A

US2551383A - Wood bending machinery

Info

Publication number: US2551383A
Application number: US561584A
Authority: US
Inventors: Michaelis Karl
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-11-02
Filing date: 1944-11-02
Publication date: 1951-05-01
Anticipated expiration: 1968-05-01

Description

y 1951 K. MICHAELIS 2,551,333

WOOD BENDING MACHINERY Filed Nov. 2, 1944 IN V EN TOR.

my at Patented May 1, 1951 UNITED STTES Zi- ATENT OFFICE,

WOOD BENDING MACHINERY Karl Michaelis, New York, N. Y.

. Application November 2, 1944, Serial No. 561,584

2 Claims.

This invention relates to machines for bending wood and more particularly wood panels and boards, to difierent radii as desired in each individual case.

In existing wood bending machines bending forms or tools of various radii are required to be mounted in the machine according to the radius desired in each individual case.

In contradistinction to this, devices constructed in accordance with the present invention are fitted with supports, checks or the like which can be adjusted to diiferent relative positions in such manner as to enable wood panels or boards or the like placed thereon or therebetween, and which have been rendered pliable by the action of dry heat, to be bent to any of the many radii for which these supports or checks can be set in the machine. Obviously the provision of such adjustable shaping members renders it easy to change over from one radius to the other and tends to lower the price of the machines.

In the drawings afiixed to this specification and forming part thereof an embodiment of this invention is illustrated diagrammatically by way of example.

In the drawings Figs. 1 and 2 are a front view and a cross-section on the line 11-11 in Fig. 1, respectively, of a machine for bending long boards or panels to arch form.

In the machine illustrated in Figs. 1 and 2, 80 is a vertical wall, represented here by a metal plate, which is formed with a number of parallel vertical slits 8 I. In these slits are fitted for vertical adjustment brackets 82 carrying rounded heads 83. Threaded pins 84 extending from the backs of the brackets and carrying nuts serve for fixing each bracket in its slit in the position allotted to it.

85 is a steel plate horizontally arranged on top and to the rear of the wall 80. 86 indicates electrical heating elements arranged underneath the plate 85. 8'! are boards which, before being bent, are rendered pliable by the action of the heat accumulating in the steel plate 85. This plate thus functions as a preheating plate such as described in my U. S. Patent No. 2,189,078. 88 is a flexible steel strip of a Width equalling or exceeding the length of the bracket heads 93. This strip is heated, for instance, by means of electrical heating elements 95 mounted on its bottom surface.

89 are boards which, after having been preheated on the table 85, were moved into position on top of the steel strip 88 and bent, together with this strip, to the curvature defined by the position of the totality of brackets adjusted in 2 their slits with their head arranged along the desired curve.

The force required to bend the pliable boards may for instance be derived from a motor winch 9|, the drum 90 of which projects underneath the table and the brackets. Cables or chains 96 slipped over pins 94 fixed in the ends of the boards and running over sheaves 9'! are wound on the drum when the motor is started, and pull the boards down onto the brackets.

I wish it to be understood that I do not desire to be limited to the details shown and described, for obvious modifications will occur to a person skilled in the art.

I claim:

1. In a Wood bending machine, relatively fixed means arranged on an are having a convex configuration and constituting a former, a normally planar flexible heat conductive element having heating means aifixed thereto, having one face in tangential line contact with said former so as to form a support for a wood blank on its other face and means for exerting a bending force at each end of said blank to move said ends and the underlying corresponding portions of said heater element around said former with the flexible heater interposed between the blank and the former.

2. The wood bending machine of claim 1 wherein the relatively fixed means comprises a plurality of adjustably supported checks arranged along said arc.

KARL MICHAELIS.

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

UNITED STATES PATENTS Number Name Date 33,395 Luckhaupt Oct. 1, 1861 51,826 Griffiths Jan. 2, 1866 106,880 Solomon Aug. 30, 1870 337,113 Bailey Mar. 2, 1886 541,890 Stickley July 2, 1895 1,434,651 Elmendorf Nov. 7, 1922 1,465,215 Hall Aug. 14, 1923 1,561,613 McKeown Nov. 17, 1925 1,766,963 Strupe June 24, 1930 1,816,377 Hobracht July 28, 1931 2,189,078 Michaelis 1- Feb. 6, 1940 2,189,150 Owens Feb. 6, 1940 FOREIGN PATENTS Number Country Date 187,977 Great Britain Sept. 14, 1907