US 1962904 A
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Description (OCR text may contain errors)
R. MARPLE June 12, 1934.
DOORLATCH Filed Oct. 24, 1932 INVENTOR 770ZZO Mar-7Z ATTORNEYS.
Patented June 12, 1934 UNITED STATES PATENT ()FFICE DOORLATCH Rollo Marple, Jackson, Mich., assignor to Hancock Manufacturing Company, a corporation of This invention relates to door latches and has particular relation to means for eliminating squeaks and other noises originating in latch bolts and other parts of latches employed on the doors of motor vehicles.
An object of the invention is to provide means for reducing the squeaks and other noises originating in the latch of a motor vehicle door by so constructing a latch front plate that oil may be retained for a considerable period of time, and for lubrication purposes around the portion of a latch bolt projecting through and disposed in slidable contact with the aforesaid front plate.
Another object of the invention is to so construct the latches employed in motor vehicles and elsewhere, as to permit a considerable amount of relative vertical movement between the latch end of a latch bolt and the plate through which it extends. This construction permits the latch bolt end to remain relatively stationary with respect to the striker plate during periods of relative movement between the door and door frame and confines practically all of the relative movement between parts to within the latch casing where the causes for noises and squeaks are more easily met.
The invention comprises generally a suitable form of latch having a latch bolt adapted to cooperate with a striker plate carried by the door frame of a motor vehicle body, or elsewhere where latches are employed, and which latch bolt extends from the inside of the latch through an opening formed in the latch front plate at the edge of the door in which the latch is secured. The opening in the front plate is preferably formed by providing a relatively small opening in the front plate and then striking inwardly the material of the front plate adjacent certain edges of the opening to form inwardly disposed flanges adapted to cooperate with and to extend within channels in which felt or other oil retaining material is confined. Openings are provided in the channels and elsewhere through which oil may be supplied to the felt and other openings are provided through which oil may slowly escape from the channels. At edges of the latch bolt where a slight movement of the latch bolt is not objectionable, the channels are slidably disposed upon the flanges formed on the front plate in such manner that movement of the latch bolt will compress the felt within the channels to press a small quantity of oil from the felt for lubricating the surfaces of the channels which the bolt slidably engages. In other regions around the bolt where movement of the bolt would be ob- 1932, Serial No. 639,209
jectionable, the channels are so formed that the oil retaining material slides or is pressed directly against the adjacent surface of the bolt and the movement of the latter causes a distribution of oil upon its surface by engagement with the felt.
Referring particularly to the drawing:
Figure 1 illustrates a side view of a latch having lubricating means associated therewith and. embracing the principles of the invention.
Fig. 2 is an end elevational view of the latch looking toward the front plate thereof andillustrating the lubricating means employed with the bolt embraced therein.
Fig. 3 is a fragmentary cross-sectional View taken substantially on line 33 of Fig. 2.
Fig. 4 is a fragmentary vertical sectional View of the latch taken substantially on line 44 of Fig. 1, and
Fig. 5 is a fragmentary horizontal sectional view taken substantially on'line 5-5 of Fig. 1.
Referring particularly to the figures of the drawing, the latch 10 employed in practicing the invention comprises a metal side plate or frame 11 having a plurality of holes 12 formed therein through which bolts or screws (not shown) are so inserted for securing the latch in position. The front of the side plate 11 is bent laterally to provide a front plate indicated at 13 which closes the opening in a door with which the latch is employed and in which opening the latch is se- 5 cured. For causing a door to be held securely within the door frame (neither the door nor the door frame being herein illustrated) the latch includes a latch bolt 14 having an end portion 16 secured to the body of the latch bolt by rivets indicated at 1'7. The rear end of the bolt is secured in a slide bracket 18 by means of a rivet 19 projecting through an elongated opening 20 formed in the bolt and the opposite end of which is fastened inthe side plate 11. The slide bracket 18 is secured elsewhere to the side plate 11 by a rivet 21 or other suitable means. The end 16 of the bolt 14 extends through an opening 22 formed inthe front plate 14. I
In order to reciprocate the bolt upon the pin 19 and within the opening 20, either to release'or to secure the door with which the latch is employed in the frametherefor, the bolt is provided with a depressed cam portion 23 which projects rearwardly into engagement with a cam portion 24 of a throw lever 26, an arm portion of which is secured for oscillating movement upon the pin 19 and in the region between the bolt 14 and the plate 11. Normally, the arm 26 is operated by a rod secured thereto by a rivet indicated at 2'7 and 110 the opposite end of which connects with a handle or lever associated with the inside of the door, in a well known manner.
When the arm 26 is oscillated in a counter clockwise direction, by operation of the aforesaid door handle, the cam portion 24 of the arm engages the cam portion 23 of the bolt 14 and withdraws the end 16 from beyond the front plate 13. When the handle is released the latch bolt again is moved forwardly in such manner that the end 16 will project beyond the front plate 13 and engage a striker plate provided on the door frame. Tending to retain the latch in the latter position, there is provided a spring 28, one end of which is secured to a pair of lugs 29 projecting from the plate 11 while the opposite end thereof engages an inwardly projecting flange 31 formed on a lower portion of the latch bolt 14.
The handle spindle 30 for opening the door from the outside is adapted to project through a fiat sided opening 32 which is formed longitudinally of a cylindrical hub 33 of a conventional roll back 34 which is slidably disposed between the surface of the side plate 11 and the inner surface of a bracket 36 secured rigidly to the side plate by riveted projections 37. The roll back 34 has a cam portion 38 formed thereon adapted to engage an end portion 39 of a slidable link 41 the rear end portion 42 of which is adapted to engage the inwardly projecting flange 31 of the bolt 14 on the side thereof opposite that engaged by the spring 28.
When the link 41 is moved rearwardly by the counter-clockwise rotation of the spindle 30, the 35' latch bolt 14 is moved rearwardly, as before, to withdraw the end 16 from in front of the front plate 13.
An upper portion of the link 41, and indicated at 43, is formed to provide the notch adapted to receive an end portion of the arm 26 when the arm is rotated in a direction opposite to that during which the latch bolt is withdrawn. When the arm is so moved into position behind the lug 43 the latch bolt 14 cannot be moved by operation of the outside handle 13 and consequently the device is considered in a locked position. Heretofore, in automobile body constructions, the latch bolt has been held against relative vertical movement with respect to its casing or other supporting structure, necessitating movement of the bolt vertically with the supporting structure and, therefore, the door to which it is secured. Such doors are normally restrained, when in closed position, against vertical movement relative to the co-operating door frame, by so-called dove-tails, but such dove-tails conventionally employ resilient or yielding means in their structure which consequently do permit a slight vertical movement of the door relative to the door frame. This relative movement of the door, accompanied by a corresponding movement of the latch bolt, causes the projecting end of the latch bolt to rub up and down on the door latch striker plate which is fixed to the door frame and,
' if the rubbing surfaces lose their lubrication, an
ment relative to its supporting structure and therefore the door, which thus permits the projecting end of the bolt to remain stationary with respect to the striker plate on the door frame during small vertical movements of the door relative to the frame, thereby eliminating the squeaks above referred to. At the same time the provision of a structure to permit such movement of the latch bolt admirably lends itself to the provision of additional means for insuring efficient means of lubricating rubbing surfaces of the latch colt to prevent possibility of squeaks developing from rubbing action thereof, and for resiliently restraining the latch bolt against possibility of rattling.
In order to obtain the advantages above described it will be noted that in forming the opening in the front flange or plate 13 to receive the forward end 16 of the latch bolt 14, there is provided at the upper and lower edges of the end 16, a pair of inwardly disposed flanges 4'7 and 48 which are formed by striking out the middle of the front plate either during or after the formation of the opening therein. These flanges are so formed as to lie in parallel relation to the upper and lower edge surfaces of the end 16 and materially spaced therefrom. In the space between the flanges and the aforesaid surfaces of the end 16 there is disposed a pair of channels 49 and 51 which normally extend in transverse relation to the end 16 and the side portions of which are disposed outwardly from the adjacent surfaces of the latch and lie alongside of the opposite edges of the flanges 47 and 48 respectively. The web portions 52 of the channels lie against the upper and lower edge surfaces of the end 16 but are so remote from the flanges 47 and 48 as to provide passages 53 and 54 therebetween. In these passages are disposed felt strips 56 and 57 which are compressed to such an extent as to resiliently and yieldably hold the channels 49 and 51 securely against the upper and lower edge surfaces of the latch 16. It will therefore be apparent that the end'16 of the bolt 14 is resiliently retained between a pair of vertically yieldable members which thus permits the desired relative and vertical movement of the end 16 of the bolt 14 with respect to the flange 13,
- and the compressed felt resiliently holds the bolt against rattling.
During the formation of the flanges 47 and 48 and in order to maintain the outer edge surfaces of the channels 49 and 51 flush with respect to the outer surface of the front plate 13, the material of the front plate adjacent the opening 22 is offset slightly in regions adjacent the flanges and as is indicated at 58. In order to provide oil or other lubricating fluid for saturating the felt strips 56 and 57 within the channels or passages 53 and 54, the front flanges of the channels are provided with openings indicated at 59 and through which such fluid may be supplied by the employment of an oil can or in any other desired manner. From the passages inside the channels 49 and 51, the oil absorbed by the felt strips 56 and 57 is supplied to the surfaces of the bolt 14 adjacent the channels through openings 61 which are formed at such intervals as to provide the desired amount of lubrication.
It will be observed that if the door holding the latch moves downwardly relative to the cooperating door frame, due to any reason the end 16 of the bolt 14 will tend to remain fixed relative to the striker plate, and the channel 49 will be moved nearer the flange 47 and consequently oil will be compressed out of the felt strip 53. At the same time the channel 51 will move away from the flange 48, due to the expansive force contained within the compressed felt strip 57. While the compression of the strip 56 will i io squeeze oil outwardly upon the bolt through the opening 61 in such channel, the opposite will be true in the case of the channel 51, in which a condition of reduced pressure will prevail and oil will be transferred from the bottom of the bolt back into the expanding felt strip 57. When conditions are reversed and the channel 49 moves away from the flange 47, thus providing an opportunity for the felt strip 5'7 to expand, any surplus oil previously squeezed out of the felt strip upon the bolt will be returned through the opening 61 to the expanding strip. At the same time the felt strip 5'? will be compressed and oil will be discharged through the opening 61 therein upon the surface of the latch bolt which results from the previous expansive action of the felt strip. Thus it will be observed that the two channels and the flanges projecting therein act somewhat like puin s to alternately and intermittently supply small quantities of oil to the bolt i l and to withdraw from the bolt any excess of oil supplied thereto. A small quantity of the oil from the felt strips 56 and 57, other than the excess amount discharged from the strips and again returned thereto through the opening 61,
will be distributed over the side face of the bolt end 16 adjacent the side plate 11 and this oil will amply lubricate the relatively large amount of contacting surface between the two aforesaid parts. Although the channels 49 and 51 are free to move to a slight extent relative to the flanges 47 and 48 due to the relative movement between the door and the frame therefor no 7 large amount of movement, sufiicient to compress the strips 56 and 5'? to an undesirable extent, will be permitted by reason of the employment of the door dovetail devices previously referred to and which resiliently limit the possible amount of movement between the two parts.
While a slight amount of up and down movement is permissible between the bolt end 16 and the front plate 13, it is not desirable to have the bolt move laterally with respect to such plate. Such sidewise movement might seriously interfere with the function of the latch, which is to hold the door firmly in place within the door frame. With this purpose in view, the opening in the front plate for receiving the end 16 is formed just wide enough to receive the end 16 and without any more clearance than is necessary for the free movement of the bolt within the opening. On the side of the bolt opposite the side plate 11, the material of the front plate is formed to provide a rearwardly disposed flange 63, the outer surface of which is adapted to provide an enlarged bearing surface for engagement with the adjacent side surface of the bolt. In order to lubricate the bolt in the region of this flange, the inner surface of the front plate has secured thereto an angle member 64 having a flange 66, the outer edge of which terminates flush with the adjacent surface of the bolt end 16. The angle member may be secured to the front plate 13 by the employment of a plurality of screws 67 or any other suitable means. Between the angle member and the flange 63 formed on the front plate 14 there is provided a space 68 extending transversely of the bolt end 16 and in which is disposed a felt or other suitable strip 69, similar to the strips 56 and 5'7 employed on the upper and lower edges of the bolt. This strip may be provided with oil from an oil can through one or more openings 71 formed in the front plate 13 and the flange 63 also may be provided with openings 72 for supplying oil to the bolt directly through the flange. The angle member flange 66 is spaced slightly from the adjacent edge of the flange 63 to provide a slight amount of space through which the felt strip 69 may project into direct contact with the adjacent surface of the bolt.
It will be observed that the lubricating device embraces a section on one side of the bolt for lubricating the bolt without permitting relative movement between the bolt and the front plate, in its direction, and a section at one of the edges of the latch for lubricating the surface thereof while permitting a limited amount of relative movement in its direction between the latch and the front plate. It is apparent that these lubricating parts can be applied to any part of the lock where lubrication is desired and may embrace any number of sections either permitting or preventing relative movement between the various parts of the structure while supplying oil or other lubricating fluid thereto.
The principal elements of the lock with which the lubricating device is illustrated are shown merely for the purpose of disclosing the invention in an operative structure and are in no way to be considered a limitation thereon.
While the structure disclosed constitutes a preferred form and application of the invention, it will be readily appreciated that numerous modified and equivalent structures may be employed within the purposes of the invention as set forth herein and within the scope of the appended claims.
1. In a door latch, in combination, a supporting structure, a latch bolt associated therewith having a projectable and retractible end portion supported for a limited amount of lateral movement in one direction relative to said supporting structure and restrained against lateral movement in a direction substantially ninety degrees removed from the first mentioned direction, means co-operating with said end portion yieldably opposing the first mentioned lateral movement, and means for retracting and projecting said bolt.
2. In a door latch, in combination, a supporting structure, a latch bolt associated therewith having a projectable and retractible end portion supported for a limited amount of lateral movement in one direction relative to said supporting structure and restrained against lateral movement in a direction substantially ninety degrees removed from the first mentioned direction, yieldable oil absorbing means opposing the first mentioned lateral movement, and means for retracting and projecting said bolt.
3. A door latch comprising a front plate having an opening therein, a latch bolt projecting through said opening and being secured inside said latch for forward and backward movement relative to said front plate, and movable means within said front plate opening and slidably engaging said bolt for laterally moving within said opening in response to lateral movements of said bolt.
4. A door latch comprising a front plate having a flanged opening therein, a latch bolt projecting through said opening and being secured inside said latch for forward and backward movement relative to said front plate, and a pair of transversely disposed channels engaging said flanges on opposite sides of said bolt and slidably engaging said bolt for lateral movement therewith.
5. A lubricating device for latches and the like comprising a member having a channel formed therein and adapted for engagement with one of the exterior surfaces of a latch bolt, a rigid flange formed on said latch and adapted to extend within said passage for retaining said member against movement in one direction but permitting movement of said member in another direction, and means within the space between said member and said flange for retaining lubricating fluid therein for distribution to said bolt.
6. A lubricating device for latches comprising a member having a channel formed therein adapted to extend across one of the surfaces of a latch bolt, means adapted to secure said member against movement inthe normal direction of operative movement of said bolt but to permit movement thereof in a direction normal to said direction of movement, said member having openings therein providing communication between said passage and the adjacent surface of said bolt, and means within said passage for retaining lubricating fluid therein.
'7. A lubricating device for latches comprising a member adapted to be movably secured to a latch adjacent the bolt element thereof, said member being adapted to provide a passage for the reception of lubricating fluid adjacent one surface of said bolt, means comprising a quantity of felt material within said passage for absorbing lubricating fluid for distribution to said bolt, and means for supplying lubricating fluid to said felt material.
8. A door latch comprising a front plate having a flanged opening formed therein, a latch bolt projecting through said opening in spaced relation to the flanged edge portion thereof, a pair of channels slidably supported upon the flanges of said opening, and having the Web portions thereof engaging said bolt, said flanges and channels providing passages therein for thereception of oil absorbing material and means for supplying lubricating fluid to said passages.
9. A door latch comprising a front plate having an opening formed therein, said front plate having flanges projecting rearwardly therefrom, a latch bolt projecting through said opening in spaced relation to said flanges, a pair of channels movably disposed on said flanges with the web portions thereof engaging said bolt, and the side portions engaging opposite extremities of said flanges, said flanges and channels being disposed in spaced relation to provide passages therebetween, strips of lubricating fluid absorbing material disposed in said passages, said channels having openings formed therein for supplying lubricating oil to said passages and for exhausting lubricating oil therefrom upon said bolt.
10. A door latch comprising a front plate having an opening therein, a flange extending inwardly from said front plate and formed along one side of said opening, a latch bolt extending through said opening and engaging said flange, a member secured to said front plate and providing a passage between said member and said flange, said passage terminating in a region occupied by said bolt, a quantity of lubricating fluid for supplying lubricating fluid to said material.