Hometown communal grave
The joint tomb system, featuring urns under tombstones and a room for returning ashes, addresses the shortage of cemeteries and decline of rural cemeteries by providing a sustainable solution for generations of family members, ensuring the management and maintenance of ancestral tombs.
Patent Information
- Application Number
- JP2025000683U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2025-04-28
- Estimated Expiration
- 2035-02-13
AI Technical Summary
The shortage of cemeteries in metropolitan areas and the decline of rural cemeteries due to population shifts and lack of successors pose challenges in managing graves and maintaining ancestral cemeteries.
A joint tomb system is introduced, where urns under tombstones can accommodate generations of family members, and a room for returning ashes to the ground is incorporated, maximizing underground space and allowing for the storage of a large number of ashes.
This solution addresses the issue of securing graves for generations, reduces the need for new graves, and allows family members to manage and maintain their ancestral tombs, contributing to the sustainability of local temples.
Smart Images

Figure 0003251106000001_ABST
Abstract
Description
[Technical field]
[0001] This invention relates to communal graves. [Background technology]
[0002] Many of the elderly people who left the countryside for the cities and supported Japan's rapid economic growth are now approaching the end of their lives. In the cycle of life, one is born, has a life of its own, and then returns to the earth and heads for paradise, but the social environment for graves is not in place for the final return to the earth.
[0003] Records of graves date back to the Jomon period as a place to return to the earth, but currently, with population concentration in metropolitan areas and population decline in rural areas, there is a shortage of cemeteries in urban areas, and in rural areas, problems such as the closure of graves due to a lack of successors have arisen, making it difficult to maintain a balance in securing graves.
[0004] Taking this situation into consideration, people are turning their attention away from ossuaries, where remains are interred inside urban buildings, and towards tree burials and communal graves, which can accommodate many remains on a limited amount of cemetery land.
[0005] The remains of all these people are initially placed within the facility, and after the 33rd anniversary memorial service, they are moved to a communal grave and returned to the earth.
[0006] Even family members rarely have the opportunity to see the part that is returned to the earth, and the situation is that it is entirely entrusted to the temple's housing and employment. [Prior art documents] [Patent documents]
[0007] [Patent Document 1] Patent Publication 2024-144897 [Patent Document 2] Mito 3247873 [Patent Document 3] Patent Publication 2023-124991 [Patent Document 4] Patent Publication 2023-118419 [Patent Document 5] Patent 7330410 [Patent Document 6] Patent 7085779 [Patent Document 7] Mito 3236544 [Patent Document 8] Patent 6454888 Summary of the Invention [Problem to be solved by the invention]
[0008] This proposal is to create a communal grave that can accommodate a large number of remains per family, in order to make up for the shortage of cemetery land caused by the concentration of population in large metropolitan areas and the increase in the elderly population, and to address the problem of a lack of successors to care for the graves due to the trend toward nuclear families and the increase in single-person households, by creating a communal grave that can be used by any generation of family members.It can also be used to prevent the decline of local temples due to a decrease in parishioners, and to address the issue of grave closures, by renovating ancestral cemeteries in hometowns. [Means for solving the problem]
[0009] In order to achieve the above-mentioned objective, the present invention provides a communal grave that has an integrated structure consisting of a coffin section for storing urns under the tombstone, allowing for the interment of the remains of several generations of a family, and a room for returning the remains to the earth, making maximum use of the underground space in the section where the tombstone above is located, and by making the urns smaller in size, it is possible to store a large number of remains, and when the number of urns exceeds the storage limit, the oldest remains can be manually moved to the room for returning the remains to the earth. Effect of the Invention
[0010] By having this communal grave, in addition to the traditional patriarchal grave, it will become a communal grave that can be used for generations by family lines other than the head of the family.
[0011] Communal graves for this purpose would also alleviate the problem of having to secure new graves each time, as well as the issue of successors who are unable to manage the graves due to a declining population.
[0012] Furthermore, by creating this communal grave in a graveyard in one's hometown, there is no need to close the grave, and all family members can take turns managing and cleaning the grave on occasions such as memorial services, and can also make contributions to the temple where the grave is located.
[0013] This will solve the problems in the Buddhist world of people abandoning their graves, leaving their parishioners, and having no successors to take over their graves, and it will also remove the barriers to the minds and actions of people who have a desire to enter the world of Buddhism. [Brief description of the drawings]
[0014] [Figure 1] 1 is a diagram showing the shape, structure and combination relationship of one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] An embodiment of the present invention will now be described with reference to FIG. Figure 1 shows the entire communal grave, and Figure 1a shows a cross-section. The communal grave has a two-tiered ossuary area, 1: ossuary room (upper level of the urn) and 2: ossuary room (lower level of the urn), and a room for returning the remains to the earth, 3: (permanent ossuary). 4-1: Remains 4-2: Remains are placed in the rooms on each level by passing through F1: ossuary opening, which is located on the ground surface and has the same horizontal position as the openings on the ground, and then through 5-1: ossuary entrance (upper level) and 5-2: ossuary entrance (lower level), and then moving horizontally through these openings to be placed in the rooms on each level. In addition, 1: ossuary (upper part of the urn) is covered by F-2: upper floor slab which has F-1: ossuary lid, 2: ossuary (lower part of the urn) is covered by F-3: lower floor slab, and the sides of both rooms are surrounded by 5: side walls. 2: ossuary (lower part of the urn) has F4: base slab which serves as its foundation, and behind that is 3: room for returning the ossuary to the earth (interment room) which is constructed with F6: perforated pipe and F7: permeable material which covers the surrounding area.
[0016] Also, Figure 1b shows the relative positions of 4: gravestone placed on F2: upper floor slab at ground level, F1: ossuary palate, and 5-1: ossuary entrance (upper level), Figure 1c shows the arrangement of 4-1 ossuary inside 1: ossuary chamber (upper level of urn) and the arrangement via F8: urn guide bit, and Figure 1d shows the arrangement of 4-2 ossuary inside 2: ossuary chamber (lower level of urn) and the arrangement via F8: urn guide bit to 3: permanent ossuary.
[0017] Furthermore, Figure 1e shows the structure of F8: urn guide bit, and F8-1: the structure of creating a groove with mortar on F4: base plate.
Claims
[Claim 1] This invention provides a communal grave with an integrated structure that combines the coffin section for storing the urn under the tombstone with a room (common enshrinement section) for returning the remains to the earth, making maximum use of the underground space within the plot of land where the tombstone above is located, and by making the urn smaller, a large number of remains can be stored. If the number of urns exceeds the storage limit, the oldest remains can be moved manually to the room (common enshrinement section) for returning the remains to the earth. This provides a resort-style communal grave for families where the remains in the communal grave can be placed in the permanent / separate type seen in previous head of the family tombs, where the remains are moved to the communal enshrinement section at a certain time, allowing people to complete their lives within the communal grave, and where families of multiple generations, regardless of whether they are the head of the family or a branch family, can inter their remains even if they do not have an heir or are single.
Citation Information
Patent Citations
JP144897B
Private branch exchange with emergency information transmitting function
JP1989054888A
Cinerary urn type graveyard structure
JP2023118419A
Gravestone
JP2023124991A
Carrot
JP3236544U