CA3107607A1 - Trowel with rounded edge,semicircular ends and detachable handle - Google Patents
Trowel with rounded edge,semicircular ends and detachable handle Download PDFInfo
- Publication number
- CA3107607A1 CA3107607A1 CA3107607A CA3107607A CA3107607A1 CA 3107607 A1 CA3107607 A1 CA 3107607A1 CA 3107607 A CA3107607 A CA 3107607A CA 3107607 A CA3107607 A CA 3107607A CA 3107607 A1 CA3107607 A1 CA 3107607A1
- Authority
- CA
- Canada
- Prior art keywords
- trowel
- handle
- work
- curvature
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 4
- 238000009499 grossing Methods 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
- E04F21/16—Implements for after-treatment of plaster or the like before it has hardened or dried, e.g. smoothing-tools, profile trowels
- E04F21/161—Trowels
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
- E04F21/16—Implements for after-treatment of plaster or the like before it has hardened or dried, e.g. smoothing-tools, profile trowels
- E04F21/161—Trowels
- E04F21/163—Trowels with exchangeable blades
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
A non-conventional trowel was designed to have non sharp, but curved edges facilitating a gradual departure of the trowel edges from the work area surface.. The radius of the curvature was chosen to achieve no edge traces and with minimum number of repeats. The trowel can be made to have the dimensions that suit the work to be done. Apart from cement and concrete work it can also be used for drywall work by concaving its surface along the mid-axis. The handle was designed to be detachable to suit the trowel's applications. Any other attachment or handle design can be accommodated to meet the application such as rotational or walk behind trowel. The embodiment of the curved or round edge with semicircular profile trowel can be implemented using steel sheet, as in conventional trowel, aluminum or any other light and hard material.
Description
Curved Edge Semi Circular EndsTrowel Curved Edges Semicircular Ends Trowel Summery of the invention The main object was to design a trowel which leaves minimum or no trail traces when smoothing concrete, cement or any other building and construction material surface.
The existing trowels have sharp edges and in this case the trowel has to be passed over the working surface with many repeats in order to achieve a smooth surface with minimum or no trail. Accordingly, a curved edges trowel is developed which consists of two Parts: the "main body", representing the curved edges part of the tool, and the "attachment or handle"
The handle in the existing trowels is usually welded to the trowel back surface creating some distortion on the working or front face surface. In most trowels some machining work has to be done to remove this. With the project work presented here these two problems are solved giving the resulting tool a better performance and to make the trowel more flexible to be adopted for other than basic work application The combination of a better interaction between the trowel with the work surface, due to the curved edges, semicircular ends and the flexibility of the attachment are the unique characteristics of the trowel.
Two designs, using steel sheet or aluminum, are presented.
A prototype of the trowel was manufactured and tested. Two samples of building and construction materials, namely cement mixture and concrete mix, were used and very satisfactory results were obtained.
Brief Description Of The Drawings Figs. 1-9 represent the embodiment using steel sheet.
Fig. 1 is a side elevation view showing the two parts: the "main body" "A" and the "attachment or handle" B", of the trowel, according to the embodiment of the invention, showing the curved edges;
Fig. 2 is a side view of the assembled trowel;
Fig. 3 is a top view of the assembled trowel;
The existing trowels have sharp edges and in this case the trowel has to be passed over the working surface with many repeats in order to achieve a smooth surface with minimum or no trail. Accordingly, a curved edges trowel is developed which consists of two Parts: the "main body", representing the curved edges part of the tool, and the "attachment or handle"
The handle in the existing trowels is usually welded to the trowel back surface creating some distortion on the working or front face surface. In most trowels some machining work has to be done to remove this. With the project work presented here these two problems are solved giving the resulting tool a better performance and to make the trowel more flexible to be adopted for other than basic work application The combination of a better interaction between the trowel with the work surface, due to the curved edges, semicircular ends and the flexibility of the attachment are the unique characteristics of the trowel.
Two designs, using steel sheet or aluminum, are presented.
A prototype of the trowel was manufactured and tested. Two samples of building and construction materials, namely cement mixture and concrete mix, were used and very satisfactory results were obtained.
Brief Description Of The Drawings Figs. 1-9 represent the embodiment using steel sheet.
Fig. 1 is a side elevation view showing the two parts: the "main body" "A" and the "attachment or handle" B", of the trowel, according to the embodiment of the invention, showing the curved edges;
Fig. 2 is a side view of the assembled trowel;
Fig. 3 is a top view of the assembled trowel;
- 2 -Fig. 4 is a top view of of the flat profile of the main body "A";
Fig. 5 is a side view of the main body "A", according to the embodiment of the invention, showing the curved edges;
Fig. 6 is a top view of the trowel's main body "A" details;
Fig. 7 is a side view of the detachable handle "B";
Fig. 8 is a front end view of the detachable handle "B";
Fig. 9 is a back end view of the detachable handle "B";
Figs. 10-14 represent the embodiment using aluminum or any other material.
Fig. 10 is a top view of main body "A" or aluminum trowel.
Fig. 11 is a side view of main body "A" for aluminum design.
Fig. 12.is a side view showing the gathering of the aluminum Main body "A" and the detachable handle "B".
FG 13 is a top view of aluminum main body with the detachable handle Fig 14 is an end view of the two parts "A" and "B".
Fig 15 is a photo of the test result on surface finishing achieved on sand mix sample;
and Fig. 16 is a photo of test result on concrete mix sample.
Detailed Description Of The Invention The tool consists of two parts; called as such, because of the flexibility of the "main body" "A" and the attachment or handle "B" as shown in Fig. 1. A side view of the combined parts to form the assembled trowel is shown in Fig. 2. A top view of the assembled trowel is shown in Fig. 3. The curvature 9 of the edge around the "main body" "A", according to the embodiment of the invention, is as shown. The vertical siding 10, with the width L, starts on and around the upper perimeter 3 of the curvature 9. On the upper perimeter 3 of the siding 4 start the wings 5 and 6, on the locations shown, which are used for receiving the attachment or handle "B" part of the trowel.
The flat profile of the "main body" "A" has the shape shown in Fig. 4. For experimental purpose, the "effective flat face" 1 of the trowel is chosen to have the dimensions of an ordinary trowel of its size and is defined by the perimeter 2.
Fig. 5 is a side view of the main body "A", according to the embodiment of the invention, showing the curved edges;
Fig. 6 is a top view of the trowel's main body "A" details;
Fig. 7 is a side view of the detachable handle "B";
Fig. 8 is a front end view of the detachable handle "B";
Fig. 9 is a back end view of the detachable handle "B";
Figs. 10-14 represent the embodiment using aluminum or any other material.
Fig. 10 is a top view of main body "A" or aluminum trowel.
Fig. 11 is a side view of main body "A" for aluminum design.
Fig. 12.is a side view showing the gathering of the aluminum Main body "A" and the detachable handle "B".
FG 13 is a top view of aluminum main body with the detachable handle Fig 14 is an end view of the two parts "A" and "B".
Fig 15 is a photo of the test result on surface finishing achieved on sand mix sample;
and Fig. 16 is a photo of test result on concrete mix sample.
Detailed Description Of The Invention The tool consists of two parts; called as such, because of the flexibility of the "main body" "A" and the attachment or handle "B" as shown in Fig. 1. A side view of the combined parts to form the assembled trowel is shown in Fig. 2. A top view of the assembled trowel is shown in Fig. 3. The curvature 9 of the edge around the "main body" "A", according to the embodiment of the invention, is as shown. The vertical siding 10, with the width L, starts on and around the upper perimeter 3 of the curvature 9. On the upper perimeter 3 of the siding 4 start the wings 5 and 6, on the locations shown, which are used for receiving the attachment or handle "B" part of the trowel.
The flat profile of the "main body" "A" has the shape shown in Fig. 4. For experimental purpose, the "effective flat face" 1 of the trowel is chosen to have the dimensions of an ordinary trowel of its size and is defined by the perimeter 2.
- 3 -In addition to the curvature's arc length X, an extra width L is added all around to form the siding 10 of the "main body" "A" of the trowel. It has an outer perimeter
4 around the X strip perimeter 3. The width of L is chosen so that it would not cause any corrugation on the curvature 9 or the siding 10 of the semicircular region of the main body on folding up stage The resulting total flat width of arc of curvature and the straight siding fold-up width will be L + X. The width of X is governed by the choice of the curvature's arc radius r of a circle to form the curvature 9 required. The curvature's arc 9 will be X= n Zrrr, where n is an index or a fraction of a circumference of a circle of radius r to be adopted for the curvature 9. It may also be taken as X = arrr/360 in terms of the angle 0 of the sector of the circle. The total width added around the effective flat face 1 perimeter 2 will be = L
+ n 2.rrr = L+ 0rrr/360 with external perimeter 3 as shown in Fig. 4.
The wings 5 and 6, as shown in Fig. 4, are made to receive the attachment or handle "B" and their dimensions are added to the overall dimension of the flat surface profile of the trowel at specific locations before forming. These wings are of suitable dimensions for fixing the attachment or handle to the main body "A".
The radii 7 and 8 for these wings, from the siding perimeter 4, are chosen so as not to cause any bending stress or pulling on the sides of the finished tool and not to affect the curvature of the main body when bent by 90 degrees to shape.
Fig. 5 shows a side view and Fig. 6 shows a top view of the resulting "main body" "A" of the trowel after forming.
The internal radius r of the curvature's arc 9 is chosen to give the required curvature around the main body of the trowel. The vertical siding 10, of height L, starts at and around the upper perimeter of the curvature 3.
On forming the "main body" "A" the curvature 9 must start and be along the perimeter 2 of the effective flat face 1 of the trowel. This is an imperative requirement in order to make the departure from the work surface as a gradual and smooth departure.
A steel mold was machined to achieve the main body of the tool, using steel sheet, with the straight siding 10 and the attachment wings 5 and 6 being vertical. Two gadgets were made, one for wing 5 and the other for wing 6. The gadget is placed below the wing and pressed against the siding 10, but not the curved part 9. This is necessary to avoid bending the siding 10 or the curvature 9 of the main body when bending the wings by 90 degrees, with a suitable curvature 11. The height of the gadget is greater than (L+X) and the width of each is greater than the width of the corresponding wing.
The wings have threaded holes 12 for fixing the "attachment" "B" to the "main body" "A"
of the trowel using socket (Allen head) screws.
The second part of the trowel is the "attachment or the trowel's handle" "B", shown in Fig 7. This is not welded to the "main body" "A" of the trowel, but attached to the wings by screws. This is one of the features of the trowel so as to make it suitable for other usage or application. Since the handle is not welded to the trowel body it will not introduce or produce any deformation or welding spots that need machining or smoothing as done in most existing trowels.
The handle "B" is shown in Fig. 7 consisting of a flat strip 14 of suitable thickness and dimensions with holes 13 for fixing with Allen screws 15 to the wings 5 and 6.
The rectangular post 16 is fixed to the flat strip 14 and the other end was made to close fit into a notch 17 made in the round wooden or rubber grip 18. The round grip 18 has a round hole to accommodate the round piece 19 attached to the rectangular post 16. The round piece is threaded at the other end and fixed by a nut 20 which is housed by the wooden grip. Fig. 8 shows a front end view and Fig. 9 shows a back end view of the handle or attachment "B".
The trowel made from a suitable thickness metal sheet was easy to handle and nearly comparable in weight to existing trowel of the same size. However, as the dimension increases the weight will increase. Thus, by adopting the embodiment presented when using aluminum or any other light, but hard material will be ideal.
Accordingly an alternative design will be more competitive and needs a simpler mold Fig 10 shows a top view of the main body "A" for the aluminum trowel. The curvature 9 of the edge around the main body "A", according to the embodiment of the invention, is as shown on the figure. The "effective flat face "1 of trowel is defined by the perimeter 2 The curvature's arc 9 around the effective flat face 1 perimeter 2 of the main body "A"
has a radius r .The trowel top edge has a perimeter 3. The curvature's arc 9 of radius r has a length X= n 2Trr, where n is an index or a fraction of a circumference of a circle of
+ n 2.rrr = L+ 0rrr/360 with external perimeter 3 as shown in Fig. 4.
The wings 5 and 6, as shown in Fig. 4, are made to receive the attachment or handle "B" and their dimensions are added to the overall dimension of the flat surface profile of the trowel at specific locations before forming. These wings are of suitable dimensions for fixing the attachment or handle to the main body "A".
The radii 7 and 8 for these wings, from the siding perimeter 4, are chosen so as not to cause any bending stress or pulling on the sides of the finished tool and not to affect the curvature of the main body when bent by 90 degrees to shape.
Fig. 5 shows a side view and Fig. 6 shows a top view of the resulting "main body" "A" of the trowel after forming.
The internal radius r of the curvature's arc 9 is chosen to give the required curvature around the main body of the trowel. The vertical siding 10, of height L, starts at and around the upper perimeter of the curvature 3.
On forming the "main body" "A" the curvature 9 must start and be along the perimeter 2 of the effective flat face 1 of the trowel. This is an imperative requirement in order to make the departure from the work surface as a gradual and smooth departure.
A steel mold was machined to achieve the main body of the tool, using steel sheet, with the straight siding 10 and the attachment wings 5 and 6 being vertical. Two gadgets were made, one for wing 5 and the other for wing 6. The gadget is placed below the wing and pressed against the siding 10, but not the curved part 9. This is necessary to avoid bending the siding 10 or the curvature 9 of the main body when bending the wings by 90 degrees, with a suitable curvature 11. The height of the gadget is greater than (L+X) and the width of each is greater than the width of the corresponding wing.
The wings have threaded holes 12 for fixing the "attachment" "B" to the "main body" "A"
of the trowel using socket (Allen head) screws.
The second part of the trowel is the "attachment or the trowel's handle" "B", shown in Fig 7. This is not welded to the "main body" "A" of the trowel, but attached to the wings by screws. This is one of the features of the trowel so as to make it suitable for other usage or application. Since the handle is not welded to the trowel body it will not introduce or produce any deformation or welding spots that need machining or smoothing as done in most existing trowels.
The handle "B" is shown in Fig. 7 consisting of a flat strip 14 of suitable thickness and dimensions with holes 13 for fixing with Allen screws 15 to the wings 5 and 6.
The rectangular post 16 is fixed to the flat strip 14 and the other end was made to close fit into a notch 17 made in the round wooden or rubber grip 18. The round grip 18 has a round hole to accommodate the round piece 19 attached to the rectangular post 16. The round piece is threaded at the other end and fixed by a nut 20 which is housed by the wooden grip. Fig. 8 shows a front end view and Fig. 9 shows a back end view of the handle or attachment "B".
The trowel made from a suitable thickness metal sheet was easy to handle and nearly comparable in weight to existing trowel of the same size. However, as the dimension increases the weight will increase. Thus, by adopting the embodiment presented when using aluminum or any other light, but hard material will be ideal.
Accordingly an alternative design will be more competitive and needs a simpler mold Fig 10 shows a top view of the main body "A" for the aluminum trowel. The curvature 9 of the edge around the main body "A", according to the embodiment of the invention, is as shown on the figure. The "effective flat face "1 of trowel is defined by the perimeter 2 The curvature's arc 9 around the effective flat face 1 perimeter 2 of the main body "A"
has a radius r .The trowel top edge has a perimeter 3. The curvature's arc 9 of radius r has a length X= n 2Trr, where n is an index or a fraction of a circumference of a circle of
- 5 -radius r to be adopted for the curvature 9. It may also be taken as X =
arrr/360 in terms of the angle 0 of the sector of the circle.
The block 21 is part of the main body "A" to receive the attachment or handle "B".
The top surface has a reinforcing rib 22 with uncritical dimensions Fig.11.shows a side view of the main body "A" of the finished trowel after forging.
The curvature 9 must start and be along the perimeter 2 of the effective face 1 of the trowel.
Fig 12 shows the gathering of the main body "A" and the attachment "B" which is made of welded parts with a grip made of wood or other material. This is similar to that used for the steel trowel except for the dimensions of the attaching base 23. Figs 13 and 14 are the top and end view of the two parts "A" and "B" to be united by using socket head (Allen screws or suitable small bolts..
Tests were carried out on a platform area of approximately 70 cm x 90 cm.
(2.5x3) sq ft.
A sample test result is shown in Fig. 15 for sand mix. Fig. 16 is another test result when using concrete mix..
Smooth surface with no trails achieved with a less number of repeats on using the curved edge and semicircular ends trowel.
arrr/360 in terms of the angle 0 of the sector of the circle.
The block 21 is part of the main body "A" to receive the attachment or handle "B".
The top surface has a reinforcing rib 22 with uncritical dimensions Fig.11.shows a side view of the main body "A" of the finished trowel after forging.
The curvature 9 must start and be along the perimeter 2 of the effective face 1 of the trowel.
Fig 12 shows the gathering of the main body "A" and the attachment "B" which is made of welded parts with a grip made of wood or other material. This is similar to that used for the steel trowel except for the dimensions of the attaching base 23. Figs 13 and 14 are the top and end view of the two parts "A" and "B" to be united by using socket head (Allen screws or suitable small bolts..
Tests were carried out on a platform area of approximately 70 cm x 90 cm.
(2.5x3) sq ft.
A sample test result is shown in Fig. 15 for sand mix. Fig. 16 is another test result when using concrete mix..
Smooth surface with no trails achieved with a less number of repeats on using the curved edge and semicircular ends trowel.
Claims (8)
1. Because of the novelty of having smooth curved edges that makes the departure of the trowel gradual without leaving trail with minimum number of repeats, as compared with conventional trowels, makes this tool useful for easing the surfacing works.
2. It can be used for general concrete, cement and other material surfaces.
3. A curvature can be introduced into the trowel face to make the trowel suitable for dry wall work.
4. Because of the curved edges and the semicircular ends of the trowel it would not etch the surface if pulled horizontally flat with work surface as the sharp edge trowels do.
5. The property of the trowel does not limit itself to a particular dimension and can be made to suit the application.
6. Because of the detachable handle the trowel can accept any handle as the kind of work requires. Accordingly, the handle or attachment can be modified and the trowel can be used for walk behind toweling.
7. When used with the proper attachment or handle it can make smoothing work easier when used in rotating machines.
8. It can be manufactured using any suitable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3107607A CA3107607A1 (en) | 2021-01-27 | 2021-01-27 | Trowel with rounded edge,semicircular ends and detachable handle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3107607A CA3107607A1 (en) | 2021-01-27 | 2021-01-27 | Trowel with rounded edge,semicircular ends and detachable handle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3107607A1 true CA3107607A1 (en) | 2022-07-27 |
Family
ID=82593851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3107607A Pending CA3107607A1 (en) | 2021-01-27 | 2021-01-27 | Trowel with rounded edge,semicircular ends and detachable handle |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA3107607A1 (en) |
-
2021
- 2021-01-27 CA CA3107607A patent/CA3107607A1/en active Pending
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