US2758861A - Bolt lock - Google Patents

Description

'Aug. 14, 1956 A. N. MOLLOY BOLT LOCK Filed Nov. 12, 1954 United States Patent BOLT LOCK.

Arthur N. Molloy, 0akdale,.N. Y.

Application November 12, 1954,. Serial No. 468,191

1'Claim. Cl. 292-57 The present invention relates primarily to door bolts and more particularly door bolts such as are frequently employed on screen doors and the like.

One of the primary objects of the present invention is to provide a bolt for doors, such as screen doors, that can at times be operated to bolt and unbolt the door from either side thereof and at other times be operated only from one side of the door, such as the inside.

Another object of the present invention is to provide a door bolt of improved design having the above feature that is reliable and positive in operation, and which is easily and readily installed and operated.

Another object of the present invention is to provide a door bolt unit having a bolt with a pair of radially extending operating elements, one on each side of the door, for slidably and rotatively operating the bolt with the bolt arranged for slidable movement only in a predetermined rotatable position.

Still another object of the present invention is to provide a door bolt that is easy and cheap to manufacture.

The above and further objects and features of the present invention will be more apparent in the following detailed description of the preferred embodiment thereof wherein reference is made to the accompanying drawings, in the latter of which:

Fig. 1 is a front view of the preferred embodiment of the invention showing the door bolt in an open or unlocked posit-ion attached to a section of a door and associated door frame;

Fig. 2 is a view similar to Fig. 1 showing the door bolt in an operated or locked position;

Fig. 3 is a rear view of the door bolt of Fig. 2; and

Fig. 4 is a sectional view taken substantially on line 44 of Fig. 1.

Referring now to the drawings, a section of a door, such as a screen or storm door, is represented by the reference numeral 11.

A flat plate 13 which may have beveled edges such as at 14 is attached to the inside of the door 11 adjacent one side thereof by screws 16. Extending outward from the central section of the plate 13 is a semi-circular section 17. The sect-ion 17 may be pressed from the central section of the plate 13 or may be formed separately and secured to the plate by suitable means such as by welding.

The inside concave surface of the section 17 and parts of the face of the plate 13 form a housing for a horizontal bolt 18 of circular cross-section. As shown in Figs. 1 and 2, the bolt 18 extends somewhat beyond the limits of the semi-circular section 17 and is slidable therein within certain limits, as will presently be described.

The semi-circular section 17 has a pair of vertical slots or openings 19 therein which are connected together adjacent the lower ends thereof by a horizontal slot or opening 21. An operating handle 22 extends radially from the bolt 18 and through the slots 19 or 21 on the bolt side of the door. Also extending radially from the 2 bolt18 and through an opening 23 in the door to theoutside thereof is a second operating handle 24 having a knob 26 in the free end thereof.

The opening 23 in the door may have a bushing 25 therein.

The operating handles 22 and- 24 are preferably on diametrically opposite sides of the bolt 18 and bymeans of. the handles the bolt may, within limits, be rotated about the axis thereof and slid in the direction of its length. It will be noted however that the bolt must be rotated to substantially the position shown in Fig. 4 to bring the operating handle 22 into alignment with the slot 21 before the bolt can be moved longitudinally. Normally the weight of the operating handle 24 and knob 26 are so much greater than that of the operating handle 22 that with the bolt 18 in either its left or right hand position as shown in Figs. 1 and 2, respectively, the operating handle 24 rests in the bottom of the opening 23 and in this position the operating handle 22 will be in either one or the other of the slots 19.

With the operating handle in either one of the slots 19 the bolt cannot slide and accordingly, the outside operating handle 24 must be raised or the inside operating handle depressed before the bolt 18 can he slid from one position to the other. This is an important feature of the present invention as it prevents undesired movement of the bolt as is sometimes the case when, for example, the door is slammed or jarred.

Mounted on the door frame 12 by screws 27 and in alignment with the plate 13 is an element 28 having a rounded bolt receiving section 29 into which the bolt 18 may be slid with the door in a closed position to thereby bolt the door and prevent it from being opened.

When the door is bolted by sliding the right hand end of the bolt 18, as shown in Fig. 2, into the rounded section 29 of the element 28, and it is desired to prevent the door from being unbolted from the outside, a safety lever 31 is positioned to prevent movement of the bolt. The safety lever 31 is pivotally mounted at one end thereof on a pivot pin 32 supported adjacent the outer end of a member 33 extending from the plate 13. Normally the safety lever 31 is in the position shown in Fig. 1 where it is out of operative alignment with the bolt 18 and does not hinder movement thereof. However, with the bolt to the right, as shown in Fig. 2, and the safety lever 31 in its upper position, movement of the bolt 18 to the left is prevented. A spring clip 34 extending from the plate 13 holds the safety lever 31 in its operated or bolt blocking position.

Since the safety lever 31 can be operated only from the inside of the door to unblock the bolt 18, the door when bolted and with the safety lever operated can not be opened from the outside. Thus, normally the bolt 18 can be operated to bolt and unbolt the door from both the outside and inside of the door, and when desired the door may be bolted and arranged through the safety lever 31 for unbolting only from the inside of the door.

While the present invention has been shown and described in the preferred embodiment thereof, it will be apparent that various modifications can be made therein without departing from the spirit or essential attributes thereof, and it is desired therefore that only such limitations be placed thereon as are imposed by the appended claim.

What is claimed is:

In a device of the type described for securing to one side of a door and cooperable with a frame attached member to lock the door and prevent it from being opened, said device including a slidable and rotatable bolt for engaging the frame attached member, a housing for said bolt and a pair of operating handles, one of said handles extending through said door to the front thereof and the other extending through said housing, vertical and horizontal slots in said housing and cooperating With said last named handle to limit movement of .said bolt, a safety lever pivotally attached to said device below the horizontal axial plane of said bolt and 5 pivotable in a vertical plane at right angles to the sliding movement of said bolt, means including said safety lever with said bolt in a door locking position to prevent movement of said bolt to a door unlocking position,

a friction clip engageable with said safety lever and means 10 including said friction clip for holding said safety lever in a bolt blocking position.

References Cited in the file of this patent UNITED STATES PATENTS Hart Nov. 4, Parsons Dec. 13, Peel Jan. 23, Copping July 16, Gertsfeld Dec. 8, Schlage May 3,

FOREIGN PATENTS Great Britain Oct. 8,

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