US2223876A - Lock - Google Patents

Description

es. 3, W. T. A. scANLAN 2,223,876

I LOOK Filed May 7, 1957 Patented Dec. 3, 1940 LOCK Thomas A. Scanlan, Greenwich, Conn., assignor to The American Hardware Corporation, New Britain, Conn, a, corporation of Connecticut Application May 7, 1937, Serial No. 141,266

2 Claims. (Cl. 70--91) My invention relates more especially to looks which are employed for securing doors or similar members in closed positions, and an object of my invention, among others, is the production of a lock for such purpose that shall be simple in construction and operation; another object of the invention is to provide a lock of this type that shall be extremely strong and durable; another object of the invention is to secure a lock of this type that shall be particularly free from tampering or unauthorized manipulation, and a still further object of the invention is to provide a lock that shall be particularly effective for producing the results herein set out.

Forms of locks embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained are illustrated in the accompanying drawing in which- Figure 1 is a View in horizontal section through a portion of a door and of a jamb, the latter comprising a portion of the opening which is adapted to be closed by the door, the door being shown slightly opened.

Figure 2 is a similar View showing the door closed.

Figure 3 is a view in horizontal section through a portion of a door and through the lock case on a plane passing through the axis of the knob spindle.

Figure 4 is an edge view of a portion of a door showing my improved lock in place thereon.

Figure 5 is a view in vertical section through a portion of a door and of a door jamb on a plane passing through the lock case.

Figure 6 is a face view of a portion of a door showing my improved lock of a little diiferent construction from that shown in the preceding figures attached to said door.

Figure 7 is a View in vertical section through the latter form of the lock.

Figure 8 is a top plan view of the structure shown in Figure 6;

Figure 9 is a view in section on a plane denoted by the dotted line 99 of Figure 7.

My improved lock may be readily applied to sliding doors or to swinging doors, both adaptations being shown in the drawing herein. Referring first to Figures 1 to 5 inclusive of the drawing the numeral [0 denotes a portion of a door of the sliding type and II a portion of a door jamb bounding the door opening. These parts are commonly composed of metal, my improved lock in fact being particularly adapted for use for locking the doors of trucks or similar vehicles employed in transmitting goods of considerable value, and an understanding of the invention and its application will be aided by considering the door It] and the jamb H as parts of a truck of such type. As above noted these 5 parts are commonly composed of metal, and as shown in the drawing herein, the metal comprising the jamb is bent to form a hollow post with a lip l2 projecting from its front face. The metal comprising the door II] is doubled back as 1 at [3 at its front edge and is adapted to slide into place behind the lip [2, as shown in Figs. 1 and 2 of the drawing. The backturned portion [3 is extended to form a housing M for a lock case I5 which is composed of metal, preferably 15 cast to shape, with a latch bolt chamber 16 opening into a socket ll extending inwardly from the front edge of the case, and as shown in Fig. 5

of the drawing. A latch bolt [8 is mounted on a pivot l9 extending across the chamber l6 and 20 is forced toward its latching position by a spring 20. The latch bolt has a nose 2| forming a hook which is adapted to engage with a keeper in a manner to be hereinafter described.

A knob spindle 22 for a knob 23 is rotatably 25 mounted in a hub 24 projecting from the case [5 through the housing 14 as shown in Figs. 3 and 4 of the drawing. This spindle has a cam 25 formed onits inner end which cam extends partially across the latch bolt l8 and operates when 30 the spindle 22 is turned to raise the latch bolt. against the tension of the spring 20. A lock cylinder 26 is secured in a hole extending inwardly through the side of the lock case and into the chamber [6, and a plug 21 having a cam 28 is ro- 35 tatably mounted in the cylinder, its rotation being governed by pin tumblers operated by a key in a manner common to pin tumbler construction and which will be readily understood by those skilled in the art. 40

This-construction enables the latch bolt l8 to be raised against the tension of the spring 20 by means of the knob or of a key inserted in the key opening in the plug 21. The lock case projects outwardly through the walls of the cas- 45 ing at the front edge of the door and may be secured to said door as by means of screw bolts extending through cars 29 projecting from the case and through holes in the housing as shown in Figs. 4 and 5 of the drawing. 50

A striker plate 30 is secured to the jamb, or post II in any suitable manner, as by means of bolts, welding, or otherwise, and a slot of keyhole shape, is formed through this plate for the reception of a keeper bolt 3|. The hole in the 55 plate is large enough to receive the head of a bolt and the slot is of a width to receive the shank of a bolt so that the latter my be slid along the slot for purposes of adjustment. A keeper 32 has a screw threaded hole extending lengthwise therein for engagement with the bolt 3| for the purpose of securing the keeper in place, said keeper having a shouldered head 33 beveled at its outer end and of a size to enter the opening into the socket H, as shown in Fig. 5 of the drawing. When the door is slid into its closed position the beveled end of the head engaging the nose 2| of the latch bolt l8 will lift the latter, and when the door is fully closed the spring 20 will cause engagement of said nose with the shouldered side of the head and the door will thereby be secured and locked in its closed position.

From an examination of Fig. 5 it will be noted that the engagement of the locking elements is wholly within the lock case l5, and the extended edge [3 of the door being located back of the lip l2 of the door jamb, it will be practically impossible to reach the locking elements by a prying or jimmying instrument, and the lock is thereby very securely guarded against unauthorized manipulation.

The construction of the tracks which support the sliding doors, and the construction of the doors themselves and of the jambs of the door openings is such that considerable adjustment is required to enable the keeper and the latch bolt to properly engage each other. I have provided ready means for accomplishing this purpose by the construction of the strike plate and the keeper so that the latter may be readily adjusted for such engagement, in this operation it being temporarily screwed on to its retaining bolt just enough to provide for sufficient friction to enable said bolt to be forced along the slot and when the keeper is properly positioned it may be tightly secured in place, as my means of a wrench, an angular part being provided on the keeper for this purpose.

In that form of the lock shown in Figs. 6 to 8 inclusive, the lock case 34 is shown as attached to a swinging door 35 such as is usually employed at the back end of a truck. The lock may be secured in place in any suitable manner, as by means of screw bolts extending through the door into the lock case. The keeper bolt 3| is secured to the end of a locking arm 36 and is of similar construction as that hereinbefore described. The head 33 of the keeper is engaged and locked by a locking pin 31, as shown in Fig. '7 of the drawing, this pin being spring pressed into engagement with the head 33, which pin is connected with the plug 21 of the pin tumbler or similar lock to be withdrawn thereby from engagement with the head. In this adaptation of the lock it will be noted that the pivot 38 of the arm 36 is connected with the locking bolts 39 for operation of the latter to lock the door 35, there usually being two of these doors, the edge of one overlapping the other to hold the latter in place, said bolts 39 being released when the arm is swung to the dotted line position shown in Fig. 6, and reversely said bolts being thrown into locked position when said arm is closed to its locked position as shown in full lines in said Figure 6.

In accordance with the provisions of the patent statutes I have described the principles of operation of my invention together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

I claim:

1. A lock mechanism including a case formed of a single piece of metal and having a latch bolt chamber extending lengthwise in the upper part of the case and a socket opening out of the bottom of said chamber near the front edge of the case with a hole through the wall of said socket into said front edge and a round hole extending through the case from side to side and cutting substantially hall into the bottom of said chamber forming a recess therein, a latch bolt pivotally secured to the case within said chamber and extending along the bottom thereof and having a shouldered nose adjacent said hole in the front edge of the case adapted for cooperation with a keeper receivable in said socket and two 1 latch bolt operating members extending in opposite directions through said round hole and rotatably mounted therein, said latch bolt operating members having shouldered notches in their meetings ends forming a groove with a flat cam bottom to receive said latch bolt for operation of said bolt by either of said bolt operating membars.

2. A lock mechanism including a case formed from a single piece of metal including an integrally formed hub for projection through an opening in the metal housing of a door, said case having a latch bolt chamber extending lengthwise in the upper part of the case and a socket opening out of the bottom of said chamber near the front edge of the case and with a hole through the wall of said socket in said front edge, there being also a hole through said hub and the opposite wall of said case out substantially half into the bottom of said chamber forming a recess therein, a latch bolt pivotally secured to the case within said chamber and having a shouldered nose adjacent said hole in the front edge of the case adapted for cooperation with a keeper receivable in said socket, a tumbler controlled key plug projecting through a hole in one side of said case into said recess, a knob operating spindle projecting through the hole in said hub into said recess, the adjacent ends of said spindle and plug within said recess having shouldered notches together forming a groove with fiat cam bottoms to receive said latch bolt for operation of said latch bolt by either said plug or spindle.

THOMAS A. SCANLAN.

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