# US 4,395,784 A · Toilet seat and lid safety lock > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,784 A - Document ID: US4395784A - Status: Granted - Kind: A - Application number: 06/318,579 - Filed: 1981-11-05 - Granted: 1983-08-02 - Earliest claimed: 1981-11-05 - Assignees: Howard C. Camp - Inventors: Tracey L. Foster - Web page: https://patentgrep.com/patent/US4395784A ## CPC - E05D 11/1007: {with positive locking} - A47K 13/12: Hinges - E05Y 2999/00: Subject-matter not otherwise provided for in this subclass - Y10T 292/1061: Rigid - E05D: HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS (pivotal connections in general F16C11/00) - A47K: SANITARY EQUIPMENT; ACCESSORIES THEREFOR, e.g. TOILET ACCESSORIES - E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A rectangular shaped lock-block with its forked interface hinge which is joined by a common axle which also serves to hold the interface hinge firmly against the toilet seat and lid and hold the lock-block device firmly against the rear of the toilet basin behind the toilet seat. The lock-block device houses a spring-latch mechanism with a removable compression spring which is held in place by a set screw located at the rear of the lock-block device. The compression spring exerts a constant pressure against the latch which is forced under the interface hinge holding it and the toilet seat lid in the down locked position. The latch must be retracted before the lid and seat can be raised. Once the hinge and lid are raised out of the locked down position, the spring forces the latch to ride against the rotating hinge and automatically relocks when the lid is lowered to the down position. ## Claims ### Claim 1 An automatically locking toilet seat and lid safety lock comprising: (a) a seat member, said seat member including at least one hinge receiving element said seat member pivoting about an axle, said axle having a longitudinal axis; (b) a spring-latch locking mechanism said locking mechanism being enclosed in a pair of generally rectangular blocks, said blocks being assembled in a face-to-face relation with a first of said blocks forming a top and a second of said blocks forming a bottom of a lock block device, said blocks being secured together; (c) a forked hinge member joining said lock block to said seat member wherein said lock block accommodates an axle member for joining the lock block to said forked hinge; (d) the top of said second block being recessed to accommodate a single piece latch and lever, said single piece latch and lever pivoting about a fulcrum, said second block further having a bottom lip which extends forward of a vertical plane which extends through the longitudinal axis of the axle; (e) both of said blocks being grooved in a manner such that when mated together they will accommodate a compression spring which is held in place by a set screw at a rear portion of the lock block device, said spring exerts a constant pressure on said single piece latch and lever thus assuring automatic locking when the forked hinge and seat are in a down position; (f) a tie-down strap which extends laterally from the sides of said second block, said strap having holes through which the seat anchor bolts pass thus securing the lock in position; (g) a single dowel pin passing between both of said blocks through the fulcrum of the single piece latch and lever thus holding said latch and lever in place, (h) both of said blocks are externally relieved on a radius which allows the rotation of the forked hinge around said axle (i) said single piece latch and lever has a lever projection and also a latch projection which extends into the externally relieved area and makes contact with a flat bottom surface of the forked hinge, said contact prohibits rotation of said forked hinge about the axle thereby locking the seat in a down position until the latch projection is pulled out of contact with the forked hinge by applying force to the lever projection. ### Claim 2 (depends on 1) The automatically, locking toilet seat and lid safety lock as described in claim 1 wherein said axle is an existing-axle about which said toilet seat pivots. ### Claim 3 (depends on 1) The automatically locking toilet seat and lid safety lock of claim 1 wherein said axle is added to said seat structure along with said lock block device. ### Claim 4 (depends on 1) The automatically locking toilet seat and lid safety lock of claim 1 wherein said safety lock is secured in position by the seat anchor bolts passing through a transverse tie-down strap. ### Claim 5 (depends on 1) The automatically locking toilet seat and lid safety lock of claim 1 wherein said safety lock is secured in position by an existing axle about which said toilet seat pivots. ### Claim 6 (depends on 1) The automatically locking toilet seat and lid safety lock of claim 1 wherein said blocks are secured together by plastic bonding. ### Claim 7 (depends on 1) The automatically locking toilet seat and lid safety lock of claim 1 wherein said blocks are secured together by male threaded screws through threaded holes in both of said blocks. ### Claim 8 (depends on 1) The invention as defined in claim 1 wherein said toilet seat and lid safety lock may be made of plastic, metal, or a combination of plastic and metal. ### Claim 9 (depends on 1) The invention as defined in claim 1 wherein said compression spring may be removed by said set screw. ### Claim 10 (depends on 1) The invention as defined in claim 1 wherein said latch projection extends from the center of the lock block. ### Claim 11 (depends on 1) The invention as defined in claim 1 wherein said latch projection extends from the side of the lock block.