Патент USA US2106955код для вставки
Feb. l, 1938. D. D. MCA. Mor-'PITT 2,106,955 LOCK Filed Aug. 25, -1.9556 2 Sheets-Sheet 2 / 25 D»,o l@ ß 7 ./l S 11w e@î w f8. .M_„m5I8Q_ 5 ' ’Í 1528 / Ln z if@ ( I f5 Jl f p5 92’ A12 . 35» ßßmfq; _ _ ' "„ä " M@ e/ y 2,105,955 UNITED STATES PA'IV‘ENT*> AOFFICE Patented Feb. 1, 1938 2,106,955 LOCK Duncan Douglas McArthur Moffitt, Arapito, Westport, New Zealand, assigner to The Mof iitt Automatic Lock Company Limited, West port, New Zealand, a corporation of New Zea land Application August 25, 1936, Serial No. 97,837 In New Zealand October 21, 1935 (Cl. 292-335) 6- Claims. Figure 7 is an elevation partly in section of a slightly modiñed form of the lock. Figure 8 is a similar view showing the position This invention relates to latches for doors, and in particular motor Vehicle doors and the like. The object of the present invention is to en 5 able the latch bolt to be withdrawn and held clear of the face of the door, and to be released when the door is closed. According to the present invention, a latch of the parts during the opening operation. Referring to the drawings, and first to Figures l to 5, a latch rod I has a latch bolt 2 with a conical engaging endto enter a conical recess in a socket 3 within the frame 4, the bolt 2 and the rod I being adapted to be projected forward bolt is formed on the end of a latch rod slideable into the recess by means of a coil spring 5 in com pression between a pin and washer 6 on the latch in the latch casing, and normally tends to be pro jected forwardly into engagement with a recess in the frame, while manual means are provided to retract the rod and bolt. A releasing rod r projects through the hinged end of the door and »is under tension of a spring which normally tends to project the releasing rod in a rearward position, so that as the door is opened this rod moves rearwardly. A retaining pawl is pivoted in the casing and is adapted to engage and retain 10 rod I and a part 1 of the lock casing, through which the end of the rod I is guided. The other end forming the latch bolt 2 is guided in a socket 8 ñtted into an end member 9 of the door. In some cases the socket may form part of the lock casing. A lever I0 is fixed on a cross member or bar I I, to which handles I2 (see Figures 4 and 6) are secured upon the exterior of the door. 20 This bar II is pivoted in the sides I4 and I5 « the latch rod in a retracted position, means forming the lock casing, these sidesY being ñxed to the part 1 and to transverse parts I6 and I1. being provided so that when the door is un latched, the retaining pawl will be actuated The lever I0 has pivoted on its upper end a pawl through the medium of the releasing rod to en gage the latch rod, but when the door is closed, . I8 adapted to engage a shoulder I9 on the ro-d 25 I. A coil spring 2li, attached to the lever I0 and such releasing rod will again actuate the retain ing pawl in order to disengage it from the latch anchored at a convenient point on the member rod and permit such rod to be projected forward 9 of the door, tends to retain the lever in the posi tion shown in Figures 1 and 3. A retaining pawl under the pressure of its spring. 2l is pivoted to the casing on a pin 22 which In one form, a trip member is provided which traverses the sides I4 and I5, the other end of 30 30 is pivoted to the releasing rod, and adapted to fall into alignment with the said rod, and with the pawl being pivoted to the end of a rod 23 a rod controlling the pawl, this trip member being slideable in the part I1. of the casing, and herein raised when the handle is initially turned in referred to as a pawl rod. 'I'he end of the pawl order to» permit the retaining pawl to engage the 2| is adapted to engage a shoulder 24 on the latch rod, but returns into position on the release rod I. A releasing rod 25 slideable in the part 1 and in the end member 26 of the door, is nor of the handle, so that when the door is being mally adapted to be projected rearwardly by a coil spring 21 in compression between the part closed, the releasing rod will, through the medi um of the trip member, actuate the pawl and so release the latch rod. 40 1 and a washer 28 and pin 29. A trip arm 30, pivoted to the releasing rod 25, is adapted to 40 align with the pawl rod 23 and with the releas ing rod 25, and is normally retained in alignment In another form, the retaining pawl is simply pivoted to a rod which is in turn pivoted to the releasing rod, the opening of the door enabling the releasing rod to o-perate the pawl to engage by a ñat spring 3| fixed to the rod 25 and bearing on the trip arm 30. The rear end of the releasing rod 25 passes the latch rod, but the closing of the door causes ' the releasing rod to disengage the pawl and per through the end member 26 and is adapted to mits the latch rod to be projected forward into strike the member 32 of the door frame, or an position. adjustable stop 33 set therein. A coil spring 34 around the pawl rod 23 is in compression between the part I1 of the casing The invention will be described with the aid of the accompanying drawings, wherein: Figure l is a side elevation partly in section of the lock. Figure 2 is a similar View but showing the posi and a washer 35 held against a pin 36. The hole in the part I1, through which the pawl rod passes,- tion of the parts during the unlatching operation. Figure 3 is also a similar View showing the posi tion of the parts when the door is being opened. Figure 4 is a cross section on line A-A Fig ure l. ' ` Figure 5 is a cross section on line B-B Fig ure l. 60 Figure 6 is a plan showing a door partly open. is slightly larger than the rod, so that a little vertical movement of the pawl rod can take place to permit the arcuate movement of the pawl 2I. A bell crank lever 31 forms a trip lever and is pivoted on a pin 33 in the sides I4 and I5 of the casing. This trip lever is shown in Figure 5 bifurcated, the ends of the forks 39 thereof hav ing a pin 40 which will engage under the trip GO 2 2,106,955 arm 30. The other end of the trip lever is con nected by a link 4| to the lever I0. means to retract said latch rod, a releasing rod projectable through the hinged edge of the door, In operation, assuming that the door has been k a spring to retain said releasing rod in projected closed and the locking bolt is in position, as 'inl position, a retaining pawl pivoted in said casing Figure l, in order to retract the latch bolt 2 to> toA engage and retain said latch rod retracted, a open the door, a handle I2 is operated, and the pawl rod pivoted to saidl retaining pawl and guided lever I0 is moved back and carries the rod I back> to the position shown in Figure 2, thereby withdrawing the conically pointed. end 2 from its recess in the frame. At the same time, the coil spring 5 is further compressed. This move ment also has caused the link 4| to operate the trip lever 37 and will cause the trip arm 30 to be moved out of alignment with the rodsf23 and 15 25, thereby permitting the rod 23 to travel rear war-ds under the action of the coil spring 34', and will cause the retaining pawl 2| to engage be hind the tooth or shoulder 24> on the latch rod I, and retain this'rod in its retractedposition. ' Upon the operator freeing the handle I2, the Vlever I0 andpawl V| 8 will return, under the action of the spring'20, back to the normal position, the link 4| returning the trip lever as'shown in Fig Yures lïandA 3, but the trip arm 30 would .re 25 main as in Figure 2. As the door is opened on its hinges, it will move away from the frame member 32l (see Figure 6) and the coil spring 2'! will `cause the releasing rod 25-to slide through the’fr'ame 2liy and-carry back with it the trip arm 3|), which will then fall into alignment with the pawl rod 23, as shown in Figure 3. The rearward movement of the rod 25 vwould be limited by a` in alignment with> said releasing rod, means to re-> tract saidl pawl rodl rearwardly and operate said retaining pawl to engaging position with said latch rod, and meansvto disengage said retaining 10 pawl from said latch rod when said releasing rod is moved forwardly upon the closing of the door. 2'. In> the latch as claimed in claim l, a pawl rod pivoted. to said retaining pawl, and guided in alignment with said'releasing rod, said pawl rod 15 pivoted to the forward end of said releasing rod, so that when the door opens the saidwpawlî is moved to enable Athe latch rod to engage it‘. ` 3. In the latch as claimed in claim 1, a guide for said pawl rod allowing only a slight amount of 20 free vertical movement to provide for therarcuate movement of said retainingrpawl. 4. In a latch for doors, a casing, a latch rod slidable in said casing, an engaging end to said latch rod, a spring normally tending to project said latch rod forwardly intoengaging position, means to retract lsaid latch rod, a releasing rod projectable through the hinged edge of the door, a spring to retain said releasing rod in a projected position, a retaining pawl pivoted in said >casing 30 to engage and retain said .latch rod retracted, a pawl rod pivoted to said retaining 'pawl and collar- or washer 42. Y Y ' ' Vguided so as to be moved forwardly by the said re When the door is being closed, upon the'rear ' leasing rod to disengage the pawl from said latch 35 end of: the releasing Yrod 25 striking the frame or stopV 33,'the trip arm 30’ will be forced forward and in turn will force forward Vthe pawl vrod 23 and thus rotate the retaining pawl 2| backto the rod wheny the door is being closed, andY means 35 whereby said pawl rod will permit the pawl to en~ gage said latch rod upon the retracting move-A ment of said latch rod independent of movement `position shown in Figure l', such movement disen- Y of the releasing rod. Y Y 40 gagingY it from the shoulder 24; the rod | moving . 5. A .latch as claimed in claim` I, a spring to 40 back a little forv this purpose. Once the rod' | is retractrvsaid pawl rod rearwardly and operate said released, it will, under the pressure of its coil spring 5, be shot forward and the conical end 2 will enter the conical recess in the socket 3, and 45 the mechanism will then assume the position shown in Figure' 1. ' v 'I'he conical end of the bolt 'ensures that any play will be taken up and will thus prevent any tendency to rattle or looseness. In Figures 7 and 8, a modification is shown, in Y50 that the trip arm >3|) with the trip lever is elim inated, the pawl rodv 23 being pivoted to the re~ leasing rod` 25'. ' l ries back the rod I as before. ~ In this case, the handlev would be retained inthe drawn~back po-V sition until the conical end of the bolt 2Qis clear Y60 of the socket, by which time the releasing rod 25 will have moved back far enough (as indicated in Figure 8) to- raise the point of the pawl> 2| toY engage the shoulder 24. When the door is be ing closed, however, the releasing rod 25 will push 65 forward the pawl rod 2'3-and will cause the re taining pawlr 2| to disengage from the shoulder ‘ ' What I claimV isr- - Y rod to disengage- said retaining pawl from the 45 said latch rod when saidy releasing rod is moved forwardly upon the closing of the door, and means . to raise said trip arm out ofralignment with Said pawl> rod to permit said pawl rod to move rear wardly and acuate said retaining pawl to en-» 50 gage'said latch rod, said trip arm adapted to return into alignment with the pawl rod when the door is opened. In this case, the operation is that when the 55 handle I2 is` rotated, theY lever I0 operates the pawl I8 which will engage the tooth I9 and car-V 24 retaining pawl to engaging position with said latch rod, a trip arm pivoted to said ,releasing rod and- adapted to fall into alignment with said pawl ' 6. A latch as claimed .in claim 1, a spring to . retract said pawl rod rearwardly and operate said retaining pawl to engaging position with said latch rod, a trip arm pivoted to said releas ing rod and adapted to fall into alignment with said pawl rod to disengage said retaining Vpawl from the said latch rod when said releasing rod is moved forwardly upon the closing of the door. ' a trip lever pivoted in said casing, and forming a support for the trip arm, and adapted to raise said trip varm out of alignment with said'pawl rod, a link connecting one end of said trip lever 65 to the means for retracting said latch rod, so that as the latch rod is retracted and said trip arm Y ‘ , 1. In a latch for doors, acasing, a latch rod 70 slidable Yin said casing, an engaging end to said rod, a spring normally tending to project said `latch rod forwardly into engaging position, raised out of Yalignment said pawl rod is per mitted to move rearwardly and actuate saidY re taining pawl. DUNCAN DQUGLAS MCARTHUR MOFFI'I'I‘.