US1681346A - Latch for the doors of motor road vehicles - Google Patents

Description

Aug. 21, 1928.

W. K. KAYE LATCH FOR THE DOORS OF MOTOR ROAD VEHICLES Filed March 10, 1926 ATT hNEfs.

Patented Aug. 21, 1928.

WALTER KELITA KAYE, OF LEEDS, ENGLAND.

LATCH FOR THE DOORS OF MOTOR ROAD VEHICLES.

Application filed March 10, 1926, Serial No.

cially those of coupes and sedans, provided with latches which are easy to close and open without submitting the same to undue strains.

and consequent wear and tear, and at the Same time to provide safety catch devices which will prevent a door from flying open, should the same be not properly closed.

It is therefore my object to arrange and construct and combine with motor vehicle doors a latch mechanism with the necessary striker plate and safety catch which shall be efficient and will stand a test of time as to wear and tear.

It has been customary in Great Britain to provide railway carriage doors with latches which have become known as the Kaye wedge locks, examples of which are disclosed in the specification of British Letters Patent Nos. 17,210 of 1906 and 10,530 of 1888. In this latch one of the main characteristics is a wedge shaped bolt arranged in connection with what is known as a ram in such wise that each serves to relieve the other of strain during operation. Further requirements led to the adoption'of a safety catch in the striking plate, which catch was depressed by the latch bolt on the closing of the door, but which projected and caught the slightly protruding bolt as the door tended to open, ex-

amples of safety catch patents in Great Britain are Numbers 10,522 of 1893 and 1,205

of 1908. Practice has however shown that a pressing contact of the wedge shaped bolt against the immovable face of the safety catch has created a tendency of the bolt to move back into its casing and acontinued opening pressure in certain circumstances tended to open the door and defeat the desired object.

A safety catch and striking plate of the kind referred to along with the improved construction hereinafter described is adaptable to the doors of motor coaches and the like and the resultant mechanism will stand considerable wear and tear and be easy of operation, owing to the absence of'stra-in on .the parts. I

Iaccomplish myin'iprovement by arranging a safety catch in the striking plate in such wise that it will easily recede during the dos ing movement of the door without placing undue strain 011 the bolt and by forming that face of the bolt which engages the safety catch, in the opening position, with a flat face which will meet and engage the safety catch 93,566, and in Great Britain June 27, 1925.

engaging face and overcome the tendency of the bolt to retire, or be pressed back within its casing.

It should be understood that the latch mechanism is of the kind that when the opening handle is released after the bolt has left itshousing in the striking plate, the wedge bolt automatically protrudes or tends to protrude to engage the safety catch. v The nature and operation of my invention are fully disclosed in the following specification and accompanying drawings in which similar reference letters indicate corresponding parts wherein Fig. 1 represents a sectional plan of a door and door pillar showing the disposition of the latchparts, striking plate, and safety catch.

Fig. 2 represents a face view of a striking plate and safety catch.

Fig. 3 represents a sectional elevation through that part of the striking plate which carries the safety catch with the nose of the bolt in the engaging position.

Fig. at represents a face view of the latch showing bolt and ram.

Fig. 5 represents an elevation of the latch mechanism and striking plate from the interior of the vehicle and Figs. 6 and 7 represent a plan and a side view respectively of a modified form of safety catch.

To carry my invention into effect. In Fig. 1 D represents a portion of the door and P the door pillar. The door D is usually hinged slightly to the outside to ermit of a clearing action between the door and pillar as the same are slightly sloped from the inside to the out side as shown. In the form of latchishown the casing L and inside handle mechanism H are fastened on the inside, a suitable spindle H shown dotted connects to the *outside handle 10,530 of 1888 and No. 15,595 of 1891, this type of latch having a'sliding 'bolt B and a ram R. 1 Inasmuch as the mechanism-for operating the bolt and ram is old and forms no part of the present invention, it is deemed unnecessary to illustrate the same herein. The striking plate S is mounted in the pillar P, a face view of the striking plate is shown in Fig. 2. This plate S is provided with a safety catch C, which is the essential feature of the present invention, as hereinafter de- The latch is of the old and well known type known as Kayes wedge type as shown for instance in British Patents No.

scribed. On the safety catch engaging side of the bolt B is a flat B formed towards its end, this flat is shown in Figs. 1 and 3.

In Fig. 1 the parts are shown with the door in its closed position but for the sake of clearness of illustration the gap between the door and striking plate is wider than it will be in actual practice.

In operation to open the door the bolt is operated in, this case either by the sliding handle H on the inside or the handle H on the outside. This movement withdraws the bolt B, and on release of the handle the bolt B has a. tendency to remain slightly projected. If therefore the door be pressed towards the opening position without keeping the bolt in its innermost position, such bolt will contact with the safety catch and prevent the door from opening. This action will take place should the door be not correctly closed.

In closing the door it is not necessary to operate either handle. The door may be pushed or pulled to, in which case the protruding bolt B will engage the pivoted safety catch and depress the same in the direction of the closing of the door until it is cleared, the bolt B riding over the face C of the catch G. Then the ram R in passing over the striking plate engages the same and at the same time the nose of the bolt B also engages the striking plate.

The ram R and bolt B move in, as described in the British patents hereinbefore referred to and this frees the bolt B and allows its' springs to actto press out such bolt until it is housed in its recess or opening S in the striking plate.

' In order to operate easily and without undue strain on the parts, the safety catch C is pivotally mounted as at C in the striking plate S, an aperture S being provided for the purpose. The catch C is contained in a casing C suitably attached to the plates as in Fig. 3 and is operated by a spring C. In order that the catch C cannot move too far out of its housing a projection C may engage the under edge of the plate S. In another form Figs. 6 and 7 the catch is provided with side projections C which will also contact with the underside of the plate S.

To prevent access of dust and dirt, the sloping face C of the catch C is set back having a making up portion C to fill up to the apertures S The bolt B as before described is provided with a flat face B and in the safety position this face will engage with the 'stop faoe C".

This arrangement prevents any tendency of pressure between the parts to push the bolt B within the casing.

It is also preferred-to limit the inward travel of the catch C within its casing C? both to relieve the springs of undue pressure and to take strain off the cam catch. Thus when the catch is in the position its incline C will be level, or nearly so, with the striking plate face, and the rear portion of the catch such as C Fig. 3 will contact with the casing C The striking plate S and catch C will be in one fitting and be attached in any convenient manner.

S represents a cover fitting for the striking plate fastened to the pillar P on the inside.

A striking plate and safety catch as hereinbefore described will be found particularly adaptable for motor car doors and obviate many of the defects now experienced.

What I claim is 1. A door fastening device, comprising a striking plate mounted in the door frame and provided with a pair'of recesses open toward the door opening, one of said recesses adapted to receive the door retaining bolt when projected, and a pivotally mounted springpressed safety catch disposed in the other recess and having a portion normally projecting beyond the outer surface of the plate, said catch being adapted to engage the bolt and stop movement of the door in the opening direction and to be pressed into its recess dur-.

ing the movement of the door in the closing direction.

2." A door fastening device, comprising a striking plate mounted in the door frame and provided with a pair of recesses open toward the door opening, one of said recesses adapted to receive the door retaining bolt when projected, and a pivotally mounted springpressed safety catch disposed in the other recess and having a portion normally projecting beyond the outer surface of the plate, said catch being adapted to engage the bolt and stop movement of the door in the opening direction and to be pressed into its recess during the movement of the door in the closing d1rection, said catch having means for limiting its movement.

In testimony whereof, I have signed my name to this specification at Leeds, Yorkshire, England, this 18th day of February,

WALTER KELITA KAYE.

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