US3804440A

US3804440A - Rotary locking bolt

Info

Publication number: US3804440A
Application number: US00298285A
Authority: US
Inventors: J Carey
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-10-17
Filing date: 1972-10-17
Publication date: 1974-04-16
Anticipated expiration: 1991-04-16

Abstract

A slide type bolt actuated by rotating a knob for normal opening and closing, and incorporating a rotary action of the bolt at the limit of sliding motion to the closed position. The bolt has notched lugs which lock on to a pin in the bolt receiving socket and prevent sliding withdrawal of the bolt. The locking action makes the bolt adaptable to sliding and double doors, as well as conventional single hinged doors.

Description

United States Patent [191 Carey Apr. 16, 1974 I ROTARY LOCKING BOLT [76] Inventor: John R. Carey, 1996 Milford Pl., El Cajon, Calif. 92020 [22] Filed: Oct. 17-, 1972 211 App]. No.: 298,285

[52] US. Cl. 292/58, 292/59 [51] Int. Cl. E05c 5/04 [58] Field of Search I. 292/57, 58, 59, 60, 61,

[56] References Cited UNITED STATES PATENTS 2,086,982 7/l937 McCarter 70/146 FOREIGN PATENTS OR APPLICATIONS lS0,047 5/1955 Sweden 292/58 Primary Examiner-Robert L. Wolfe Attorney, Agent, or Firm-Brown and Martin [57] ABSTRACT A slide type bolt actuated by rotating a knob for normal opening and closing, and incorporating a rotary action of the bolt at the limit of sliding motion to the closed position. The bolt has notched lugs which lock on to a pin in the bolt receiving socket and prevent sliding withdrawal of the bolt. The locking action makes the bolt adaptable to sliding and double doors, as well as conventional single hinged doors.

3 Claims, 10 Drawing Figures ROTARY LOCKING BOLT BACKGROUND OF THE INVENTION One common type of security bolt used on kitchen doors and the like has a sliding bolt operated by rotating a knob to actuate a rack and pinion type mechanism. The bolt is usually fitted into the door and the end of the bolt seats in a socket or striker plate in the door jamb. The use is limited to single hinged doors and, unless the clearance between door and jamb is very close, it is possible to force the bolt back. Since this type of bolt is simple to install and operate, it would be advantageous to have a positive locking means and extend the usefulness of the bolt to other types of doors.

SUMMARY OF THE INVENTION The bolt mechanism described herein utilizes a rotary knob actuated slide bolt and incorporates rotation of the bolt, also actuated by the knob, for positive looking action. The socket in which the end of the bolt seats contains a fixed retaining pin, the bolt end being slotted to clear the pin in normal sliding action. At opposite sides of the clearance slot are notched lugs which lock on the retaining pin when the bolt is rotated.

In one form the knob is connected to the bolt by a crank arm and link, the rotation being accomplished by a cam during the final sliding motion of the bolt. The linkage travels over center at the fully locked position for added security. In another form the conventional rack and pinion type mechanism is modified to incorporate rotation by sliding the knob along a slot. The positive locking of the mechanism makes the bolt adaptable to double doors, sliding doors, windows and the like. v

The primary object of this invention, therefore, is to provide a new and improved rotary locking bolt.

Another object of this invention is to provide a new and improved slide bolt actuated by rotating a knob and having a rotary action in the closed position to lock on a retainer.

A further object of this invention is to provide a new and improved slide bolt in which the complete bolting and locking action is controlled by the single knob.

Other objects and many advantages of this invention will become more apparent upon a reading of the following detailed description and an examination of the drawings, wherein like reference numerals designate like parts throughout and in which BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a top plan view of one form of the bolt assembly, portions of a door structure being indicated in broken line.

FIG. 2 is a sectional view taken on line2-2 of FIG. I, the bolt being open.

FIG. 3 is a view similar to FIG. 2, but with the bolt closed and locked.

FIG. 4 is a sectional view taken on line 4--4 of FIG. 2.

FIG. 5 is a sectional view taken on line 5-5 of FIG. 2.

FIG. 6 is a view from the left hand end of FIG. 2. FIG. 7 is a view from the left hand end of FIG. 3. FIG. 8 is a top plan view of an alternative form of the bolt assembly.

FIG. 9 is a sectional view taken on line 9-9 of FIG. 8.

FIG. 10 is a view from the left hand end of FIG. 9.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the form illustrated in FIGS. 1-7, the bolt assembly comprises a bolt unit 10 recessed in a door 12 and a socket unit 14 in the door jamb 16. It should be under stood that the door jamb is used for purposes of description only, since the socket unit could be in another door, either sliding or hinged.

Bolt unit 10 comprises a cylindrical barrel l8 fixed to an end plate 20 which seats in the edge portion of the door, the barrel being contained in a suitable bore made in the door. Slidably mounted in barrel 18 is a bolt 22, one end of which has a diametrical slot 24, the slot extending longitudinally into a pair of rotatably offset notches 26 which leave end portions of the bolt forming opposed lugs 28. At the other end of bolt 22 is an axially extending, reduced diameter stud 30, on which is mounted a cap 32. The cap is free to rotate but is held against axial movement by a snap retainer 34 re cessed into a circumferential groove 35 in stud 30.

Diametrically mounted in barrel 18 is a sleeve 36 having a square or otherwise non'circular bore 38. The actuating knob 40 is secured on a shaft 42 which matches the cross section of and is slidable through bore 38, to facilitate installation and removal of the bolt. In FIG. 1, the shaft is shown extending through the door and could be fitted with an external knob, not

shown, of the locking type. For internal operation only the shaft would terminate in the barrel 18. Fixed to sleeve 36 are radially extending arms 44 and pivotally attached to the arms is a link 46, held between the arms by a hinge pin 48. The other end of link 46 is pivotally connected to cap 32 by a hinge pin 50. Barrel 18 has an elongated opening 52 to provide clearance for the arm and link motion.

Fixed through bolt 22 is a cam follower pin 54, the ends of which ride in opposed cam slots 56 in barrel 18. The major portions of the cam slots are longitudinally straight, to guide the bolt axially with the end slot 24 held in alignment. Adjacent the end plate 20 the cam slots 56 have helical portions 58, which cause the bolt to be rotated as it moves axially, the rotation indicated being about 60 as an example.

Socket unit 14 comprises a cylindrical socket element 60 to receive the bolt 22, the socket element being fixed to an end plate 62 which is seated in jamb 16. Fixed diametrically across the socket element is a retainer pin 64, over which the end slot 24 of the bolt will pass freely.

In the retracted position of the bolt, as in FIGS. 1 and 2, the arms 44 are pulled back so that link 46 rests on sleeve 36 and acts as a stop. When knob 40 is rotated counterclockwise, link 46 pushes. the bolt 22 axially until the end enters socket element 60. If the rotation of the knob is stopped when a slight resistance is felt, the bolt will merely hold the door in the manner of a conventional slide bolt. Continued rotation of the knob, however, will cause follower pin 54 to ride in the helical portions 58 of the cam slots and rotate the bolt. Retainer pin 64 will thus be engaged in notches 26 and lugs 28 will lock the bolt against axial displacement. In the locked position the arm and link connection will swing over center beyond a line joining the centers of hinge pin 50 and shaft 42, until arms 44 rest on the bottom of barrel 18 as in FIG. 3, providing a secure locking action against forced movement of the bolt. It is this positive locking which makes the bolt assembly suitable for sliding or double folding doors.

The alternative form of the bolt assembly illustrated in FIGS. 8-10 comprises a bolt unit 70 mounted in door 72 and a socket unit 74 in jamb 76. The bolt unit has a cylindrical barrel 78 mounted on an end plate 80, which is seated in the edge of the door. Bolt 82, slidably mounted in barrel 78, has a diametrical slot 84 in one end, the slot extending into rotatably offset notches 86 leaving opposed lugs 88 at the ends of the slot. The other end of bolt 82 has an integral, longitudinally extending toothed rack 90, which is engaged by a pinion toothed shaft 92 extending substantially diametrically through barrel 78. Rotation of a knob 94 fixed on extended shaft 92 moves the bolt axially.

Barrel 78 is rotatably held in end plate 80, such as by the flanged end 96 of the barrel outside the end plate and a retaining collar 98 on the other side. Shaft 92 extends through a vertical guide slot 100 in an escutcheon plate 102, which is secured on the inside face of door 72, the guide slot providing controlled vertical motion of the knob 94 and corresponding rotary motion of barrel 78 and bolt 82.

Socket unit 74 comprises a cylindrical socket element 104 fixed to an end plate 106 and having a retaining pin 108 fixed diametrically across the socket element. In normal slide action of the bolt, slot 84 will clear the retaining pin, the bolt being operated with the knob 94 at the upper end of guide slot 100, as in FIG. 8 and in the broken line position in FIG. 9. To lock the bolt the knob 94 is depressed to the bottom of guide slot 100, causing bolt 82 to be rotated and lugs 88 to latch over the retaining pin 108, as in the full line position in FIG. 10. The bolt is thus operable as a normal slide bolt, or with the added rotating and locking action, making it also suitable for sliding or double doors.

Having described my invention, I now claim: l. A rotary locking bolt, comprising:

a bolt unit having means for mounting in a movable door; a socket unit having means for mounting in a door structure against which the movable door closes; said bolt unit having a cylindrical barrel with a bolt slidably retained therein;

one end of said bolt having a slot with rotatably offset notched lugs;

said socket unit having a socket element with a retaining pin fixed therein to receive the slotted end of the bolt;

a knob having a shaft passing through said barrel;

actuating means including an arm extending from said shaft, and a link pivotally interconnecting said arm and said bolt for sliding operation of the bolt;

and said actuating means further including rotating means for rotating the bolt to lock said lugs over said retaining pin.

2. A rotary locking bolt according to claim 1, wherein said barrel has clearance for the pivotal connection of said arm and link to pass over center and lock beyond a line between the center of said shaft and the pivotal connection of the link to the bolt.

3. A rotary locking bolt according to claim 2, and including a cap rotatably retained on the other end of said bolt, said link being attached to the cap.

Claims

1. A rotary locking bolt, comprising: a bolt unit having means for mounting in a movable door; a socket unit having means for mounting in a door structure against which the movable door closes; said bolt unit having a cylindrical barrel with a bolt slidably retained therein; one end of said bolt having a slot with rotatably offset notched lugs; said socket unit having a socket element with a retaining pin fixed therein to receive the slotted end of the bolt; a knob having a shaft passing through said barrel; actuating means including an arm extending from said shaft, and a link pivotally interconnecting said arm and said bolt for sliding operation of the bolt; and said actuating means further including rotating means for rotating the bolt to lock said lugs over said retaining pin.