US3881221A - Invisible hinge - Google Patents

Abstract

An Improved Invisible Hinge construction of the type in which the hinge bodies are recessed into the surfaces of the relatively immovable parts. The improvement comprises utilization of dense plastic material having excellent wear and friction-reducing characteristics in the laminated connectors or the hinge blocks in a manner to maintain the cantilever strength of the hinge while improving the wear life and action. This includes incorporating a similar material in the slide pins which transfix the laminant connectors.

Description

United States Patent [191 Schmidt May 6,1975

[ INVISIBLE I-IINGE [75] Inventor: I-Iarold F. Schmidt, Warren, Mich.

[73] Assignee: SOS Consolidated, Inc.,

Birmingham, Mich.

[22] Filed: Jan. 14, 1974 [21] Appl. No.: 432,945

[52] US. Cl. 16/163 [51] Int. Cl E05d 3/06 [58] Field of Search 16/163, 164, 128;

117/161 P, 132 CF;252/12, 12.2

[56] References Cited UNITED STATES PATENTS 2,021,702 11/1935 Soss 16/164 2,901,753 9/1959 Sperzel 2,932,503 4/1960 LeVan 3,040,339 6/1962 Sperzel 3,058,791 10/1962 Stallman 117/132 CF OTHER PUBLICATIONS IMB Technical Disclosure Bulletin Coated Moving Parts and Installation Method, Vol. 9, N0. 7, Dec.

1966, R. J. Pencsac.

Primary ExaminerPaul R. Gilliam Assistant ExaminerDoris L. Troutman Attorney, Agent, or Firm-Barnes, Kisselle, Raisch & Choate [57] ABSTRACT An Improved Invisible Hinge construction of the type in which the hinge bodies are recessed into the surfaces of the relatively immovable parts. The improvement comprises utilization of dense plastic material having excellent wear and friction-reducingcharacteristics in the laminated connectors or the hinge blocks in a manner to maintain the cantilever strength of the hinge while improving the wear life and action. This includes incorporating a similar material in the slide pins which transfix the laminant connectors.

2 Claims, 6 Drawing Figures PATENTEBHAY 6 I975 F'IG.2

FIC3.4

INVISIBLE HINGE This invention relates to Improvements in an Invisible Hinge.

The invisible hinge has been widely used throughout the world for many years. A basic design is illustrated in US. Pat. No. 1,984,092, issued Dec. 11, 1934 to Joseph Soss.

It is an object of the present invention to improve the basic design by providing structural elements which improve the load-carrying characteristics while also improving the action of the hinge.

It is a further object of the invention to improve the design without basic changes in the dimensions or dies which are already existing and available in standard practice. Thus, the mechanical or architectural specifications and standards which have been longstanding in the industry need not be changed to accommodate the new design.

The invisible hinge construction has long used a plurality of laminate links connecting the portions of the hinge which are recessed in the abutting surfaces (when closed) of the jamb and door edge. The present invention contemplates providing split laminate sections formed of a durable dense plastic having bearing and wear characteristics, these being placed on the opposite sides of individual laminate stacks to maintain the dimensions of each stack while improving its wear characteristics and reducing the need for lubrication and improving the action" of the hinge. In addition, bearing sleeves are provided in contact with the outside laminates and around the transfixing slide pins to increase the friction-reducing surfaces and further improve the action without reducing the resistance to cantilever load.

Other objects and features of the invention relating to the principles of operation and details of construction will be apparent in the following description and claims wherein is set forth the best mode presently contemplated for the practice of the invention.

DRAWINGS accompany the disclosure and the various views thereof may be described as:

FIG. 1, a view of the inside of a hinge in closed positron;

FIG. 2, a view of the outside or back of the hinge in closed position;

FIG. 3, an end view of the closed hinge;

FIG. 4, an inside view of the hinge in open position;

FIG. 5, a sectional view of the hinge taken on line 5-5 of FIG. 1; and

FIG. 6, a sectional view of the hinge in open position.

Referring to the drawings, in FIG. 1 the face of the hinge is shown in the closed position having right and left block body portions and 12. These portions are completely recessed into a door jamb and the edge of a door respectively so that the hinge is invisible from the outside when the door is closed. The rear face of the hinge is shown in FIG. 2. The body portions 10 and 12 have extensions 14-16 and 18-20 respectively, which are provided with screw holes 22 to secure the hinges in the recessed parts. An end view of the hinge is shown in FIG. 3.

The blocks or body portions 10 and 12 are each proinner face of the hinge blocks. With reference to the drawings, these first pivot pins are shown in section in FIG. 6. Two sets of plates designated generally at 30 and 32 are pivoted at one end on the pin 34 which is introduced through a hole 36. The other sets of plates 40 and 42 are pivoted on block 12 by a pin 44 introduced through hole 46. The other ends of these sets of plates are transfixed by a slide pin shown respectively at 48 and 50 and intermediate portions of the plate sets are transfixed by a riveted pin 52 centrally of the assembly. Sectional views 5 and 6 show the parts in closed and open positions.

The die cast blocks 10 and 12 are provided with slide recesses and 62 respectively open to the inner face which receive the ends of the slide plate sets which are transfixed by the pins 50 and 48. Intermediate the top and bottom of these recesses is a stationary slide bar 64 and on the top and bottom walls of these recesses are slotted grooves 66 and 68 which serve as locators and guides for the respective ends of slide pins 48 and 50. Small pockets 70 provide clearance for the rivet heads of rivet pin 52.

In previous hinge constructions, the plate sets 30-32 and 40-42 have been constructed of an equal number of similarly dimensioned plates which support the cantilever load of a hinged door. Over a long period of use, the top and bottom plates have a tendency to wear into the body sections due to the difference in hardness between the steel links and the zinc alloy body sections. In the present construction, the plate sets are formed of three equally dimensioned stamped-out metal plates 72 capped on the top and bottom by plates 74 of halfthickness to make a total dimension of four plates. These capping plates are preferably formed of a durable dense plastic material having a good friction reducing, non-scratch surface such as Nylon reinforced with molybdenum disulphide. This material has a good resistance to water, oil and solvents, and a compressive strength of about 13,000 p.s.i. It can be stamped into shapes identical with the case-hardened metal plates 72 and the shaped plates assembled with the metal plates into the composite and interdigitally arranged plate sets. This places the plastic material in face-to-face contact between the plate sets and also in face contact with the top and bottom surfaces of the block recesses.

The action of the hinge is greatly improved also by the use of plastic bushings of the same Nylon material around slide pins 48 and 50. As shown in FIG. 4, the top and bottom ends of the slide pins are inserted respectively in collars or bushings and 82 which slide in the slots 66 and 68. In addition, a slide block 84 surrounds a central portion of pins 48 and 50 having a flat surface in contact with stationary slide bars 64.

Thus, the metal-to-metal contact has been practically eliminated and yet, due to the hardness of the plastic material and the manner in which it has been inserted, the supporting characteristics of the hinge have not been impaired. The action of the hinging motion is smooth and resistance to motion has been reduced. as well as the need for lubrication. In addition, this has been accomplished without the need for any changes in the outside dimensions of the hinge so that longstanding architectural specifications need not be altered. Another important characteristic lies in the fact that the strength of the hinges has been maintained even though the plastic may not have the resistance to bending found in the steel links.

I claim:

1. in an invisible hinge construction of the type including a pair of hinge blocks each to be recessed into relatively movable parts, each block having a first pivot pin adjacent a face surface parallel to the axis of hinging and each having a recess forming a slide portion, a plurality of interdigitally disposed contiguous sets of slide plates, each set composed of a plurality of plates and each set having one end transfixed by a pivot pin in one of said blocks and the other end transfixed by a slide pin parallel to said pivot pin, and a portion intermediate the ends transfixed by a second pivot pin parallel to said other pins and independent of said blocks, that improvement in metal hinge blocks which comprises a slide plate formed of dense, friction-reducing slide plates, said end slide plates having a thickness approximately one-half of the metal plates whereby the two end plates take up space equivalent to one metal plate, the plastic slide plates being in sliding contact during motion of the hinge with other plastic slide plates of the contiguous sets in the hinge and with metal of the recesses in said hinge blocks.

2. An invisible hinge as defined in claim 1 in which each slide pin is surrounded with a bushing of dense plastic which moves in sliding contact with slide surfaces in said hinge blocks, certain of said bushings bearing against unsupported ends of said plastic slide plates to maintain assembly position.

Claims (2)

1. In an invisible hinge construction of the type including a pair of hinge blocks each to be recessed into relatively movable parts, each block having a first pivot pin adjacent a face surface parallel to the axis of hinging and each having a recess forming a slide portion, a plurality of interdigitally disposed contiguous sets of slide plates, each set composed of a plurality of plates and each set having one end transfixed by a pivot pin in one of said blocks and the other end transfixed by a slide pin parallel to said pivot pin, and a portion intermediate the ends transfixed by a second pivot pin parallel to said other pins and independent of said blocks, that improvement in metal hinge blocks which comprises a slide plate formed of dense, frictionreducing plastic at each end of each set of a plurality of metal slide plates, said end slide plates having a thickness approximately one-half of the metal plates whereby the two end plates take up space equivalent to one metal plate, the plastic slide plates being in sliding contact during motion of the hinge with other plastic slide plates of the contiguous sets in the hinge and with metal of the recesses in said hinge blocks.

2. An invisible hinge as defined in claim 1 in which each slide pin is surrounded with a bushing of dense plastic which moves in sliding contact with slide surfaces in said hinge blocks, certain of said bushings bearing against unsupported ends of said plastic slide plates to maintain assembly position.

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