JPS61154720A - Hole puncher - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for punching holes in sheet metal, etc., and more particularly relates to a device for punching holes in sheet metal, etc. The present invention also relates to an extremely effective hole punching device.

[Conventional technology]

Electricians and the like often find it necessary to punch fairly large diameter holes in sheet metal, etc., in order to pass cables, etc. through them. Drilling large holes in sheet metal is not easy. It is customary to first drill a small hole and then use a punch and die (hereinafter sometimes collectively referred to as a "die") to punch out the hole of the required size. The punch and die are placed on opposite sides of the workpiece so that they are concentric with the drilled hole. The 7-year-old is passed through the die hole and the drilled hole and engaged with the punch.

The die and punch are then forced together by a system that includes a hydraulic system or a manual lever, compressing the workpiece between them and drilling a hole of the desired size.

[Problem that the invention seeks to solve]

Good hydraulic systems work well but are expensive. Systems that include manual levers are less effective and require considerable effort to operate. Additionally, two handles are required. One is usually ratcheted and allows operation in restricted spaces, and the other is provided solely for the purpose of offsetting the large torque that is transmitted to the workpiece.

Both hydraulic systems and systems that include manual levers are bulky and heavy. These tools are generally bulky and must be carried from one job to another.
Thickness and weight are significant disadvantages.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the problems of conventional fire punching devices as described above, and in particular to provide a hole punching device that is very compact, light, easy to use and inexpensive.

Another object of the invention is that it is driven by a conventional electric hand drill, is protected in various ways against both normal overloads and abnormal torques, is easily released in case of overload, and is quickly The object of the present invention is to provide a hole punching device that can be used.

[Selling means to solve problems]

The above problem consists of a pair of cooperating dies attached to the near and far sides of the workpiece, a housing that engages with the near die, and a pair of cooperating dies that are supported within the housing and formed between the near die and the workpiece. The solution is a hole punching device with a shaft inserted into the hole and mating with a remote die. The worm gear is threaded onto the shaft and the worm engages the worm gear. The drive means is engaged with the worm, so that when the drive means is actuated, the distant die is drawn toward the workpiece, compressing the workpiece between the far and near moving dies, and the near and far moving dies cooperate to It is designed to punch holes into the workpiece.

According to one aspect of the invention, the drive means comprises a power tool, such as a conventional electric hand drill, and means for coupling the power tool to the worm. The coupling means cooperates with the first part rotated by the power tool, the second part rotated with the worm, and the first and second parts to rotate both parts together at all times, but with no overload. and shearable means for shearing the first part so that it is rotated by the drill while the second part remains stationary when loaded.

The second portion of the coupling means is formed with means having a pair of flats formed on opposite sides to facilitate retention by a hand tool, so that during shearing action of said shearable means, the hand tool A tool can be used to rotate the worm in the opposite direction to remove the device from the workpiece.

According to another aspect of the invention, handle means are provided integral with the shaft, whereby the shaft is manually rotated to rapidly engage the workpiece with the die prior to actuation of the drive means. be able to.

According to yet another aspect of the invention, a pair of pushers are supported within the housing to resist the applied torque on the worm gear, about an axis perpendicular to the axis of the worm gear. can be attached to.

According to yet another aspect of the invention, the worm gear and the shaft are mutually engaged by means of threads having a substantially radial load-bearing surface with respect to the axis of the shaft. The threads may be of the serrated or acme type, for example.

〔Example〕

1-4 illustrate a first preferred embodiment of a hole punching device 10 according to the present invention. The device 10 has a workpiece 16
It has a pair of cooperating dies 12 and 14 (FIG. 1) mounted on the proximal and distal sides, respectively. The workpiece 16 may be, for example, a piece of sheet metal. The closer die 12 has a circular cross-section and has a cavity 18 and a central circular hole 20 formed therein. The far die (technically a punch) is also circular in cross-section and has multiple teeth (four teeth as shown in Figure 1 or two teeth as shown in Figure 5).
2 teeth) and a central circular hole 24 are formed.

Portions 26a and 26b that can be connected by bolt 27
The housing 26 is formed with a shoulder 28 by means of which the housing 26 engages the proximal die 12. A threaded shaft 30 is supported within the housing 26 and inserted through a hole 20 formed in the proximal die 12 and a hole 32 formed in the workpiece 16 using, for example, a conventional electric drill. and is arranged so as to engage with the farthest die 14. The shaft 30 is loosely fitted into the holes 20 and 3°2, but is firmly engaged with the die 14 located further away, for example, by screwing through the hole 24.

A worm gear 34 (see especially FIGS. 1 and 2) is threadedly engaged with the shaft 30, and a worm 36 is trapped for engagement with the worm gear 34.

Drive means 38 are provided, which are shown in FIG. 2 by the outline of the chuck of a known electric drill. The drive means includes means 40 for coupling the power tool to the worm 36.

In this way, when the drive means 38 is actuated in the forward direction, the coupling means 40 . Worm 36 and worm gear 3
4 is a screw shirt) 30:Z Rotates in a direction that is pulled to the left in Fig. 1. Therefore, the far die 14 is drawn towards the workpiece 16 and compresses the workpiece 16 between the near die 12 and the far die 4. Both dies cooperate to punch a hole in the workpiece having a diameter substantially equal to the diameter of the cavity 18 of the die 12 or the outer diameter of the die 14. Once the dies are engaged with the workpiece, they do not rotate about the axis of the shaft 30 and, in fact, no torque about said axis is generated upon actuation of the drive means 38.

According to one embodiment of the invention, the coupling means 40 includes a first portion 42 rotated by the power tool 38 and a worm 36.
a second portion 44 (FIG. 3) co-rotating with the Sharpino 4;
and shearable means such as 6. Sharpin is
It cooperates with the first and second sections 42 and 44 to co-rotate both sections at all times, and in the event of an overload, only the first section 42 is rotated by the power tool 38 while the second section remains stationary. It is something.

Preferably, the first portion 42 and the second portion 44 are concentric, the first portion 42 surrounding the second portion 44, and the second portion 44 being formed with means to facilitate engagement with a hand tool. ing. By this means, upon shearing of the seven-year pin 46, after removal of the outer portion 42, a hand tool is used to grasp the inner portion 44 and the worm 36 is rotated in the opposite direction to remove the device 10 from the workpiece 16. It can be removed. Said means for facilitating engagement with a hand tool comprises a second
It has a pair of flat portions 48 (FIG. 4) formed on both sides of portion 44.

Sherbin 46 includes first and second portions 42 and 44
The shear bins 46 are inserted into holes 50, 51, respectively formed in the holes 50 and 51, which are aligned prior to insertion of the shear bin 46. The shear pin 46 is held in place by the O IJ song 2 which is housed within a circumferential groove 54 formed in the first portion 42 .

According to other embodiments of the invention, an elastomeric well 56 (FIG. 1) or a knob 58 (
Handle means, such as those shown in FIGS. 5 and 6), are provided by which the shaft 30 can be manually rotated to rotate the die 16 against the workpiece 16 prior to actuation of the drive means 38.
and 14 can be engaged quickly. The handle means may actually be part of the shaft 30 body.

The driving means 38 includes a worm 36 and a worm gear 34.
(through the shirt) 30. The connections between the worm 36 and the worm gear 34 and between the worm gear 34 and the threaded shaft 30 have large reduction ratios, so that only the drive source 38 can be used to drive both sides of the workpiece 16. Many seconds can be spent bringing dies 12 and 14 into intimate contact. Handle 56 or 58 is coupled directly to shaft 30 so that dies 12 and 14 can be quickly engaged with workpiece 16.

The song 26' (Figures 5 and 6) of the tree climbing 8H is extended in the axial direction. In the embodiment of FIG. 5, a pair of pushers 60 and 62 are supported within the housing 26' and the worm gear 3
40 are mounted around the shaft 30 on both sides to resist torque applied to the worm gear 34 about an axis perpendicular to the axis of the worm gear 34. This torque may, for example, cause one of the teeth 22 or 22' of the die 14 or 14' to not contact the workpiece 16 but not the other tooth 22 or 22'.
2' occurs when enlarging a pre-drilled hole large enough to touch. The above torques are also generated when punching a hole in the edge of a workpiece, thus also when one or more teeth of the male die are in contact with the workpiece and one or more teeth are not. do.

Pushes 60 and 62 are preferably worm gears 34
The housing 26' is spaced a substantial distance apart and is press-fit within the cavity 64 of the housing 26'. The shaft 30 is the shaft 3
0 is loosely fitted into pushers 60 and 62 with just enough tolerance to allow a slight twist about an axis perpendicular to the axes of shaft 30 and worm gear 34.

According to yet another embodiment of the invention, a worm gear 34
and shaft 30 are mutually engaged by threads having a load-bearing surface 66 (FIG. 6) that is substantially radial to the axis of shaft 30. The threads may be of the serrated type as shown in FIG. or,
Acme type threads 66' may be provided as shown in FIG.

In either case, the threaded load bearing is substantially radial in surface so that the shaft 30 and the worm gear 34
Even if there is a large tensile force between the worm gear 34
There is no tendency to enlarge the inner diameter. If the load bearing is of a threaded type with surfaces that are not substantially radial,
A radial force is generated which enlarges the inner diameter of the worm gear 34 and would destroy the device if overloaded and no shearable means were provided.

If special threads are employed, as shown in FIGS. 6 and 7, an extension 67 is provided with known threads suitable for engaging standard commercially available punches.

Bearings 68 and 70.70 (FIGS. 1 and 2) absorb thrust loads acting on worm gear 34 and worm 36, respectively, and needle bearings 72.72 absorb radial loads acting on worm 36. . The worm assembly is held in place by a snap ring 74.

Thus, the present invention provides a new and efficient hole punching device that is more compact, lighter, easier to use, and less expensive than previous devices.

Electricians and others who require such a device already own an electric drill that they use to drill a small hole in a workpiece through which the shaft 30 passes. It is therefore much easier to use the device according to the invention than to carry additional equipment with hydraulic systems or manual levers.

Various modifications to the preferred embodiments of the invention disclosed herein will be readily apparent to those skilled in the art. For example, it is within the scope of the invention to use bunch 14 or 14' as a near die instead of as a far die as shown. therefore,
The invention is intended to include all structures falling within the scope of the claims.

〔Effect of the invention〕

Since the hole punching device according to the present invention is as described above, it is very compact, light, easy to use and inexpensive, and furthermore, it can be driven by an ordinary electric hand drill and is capable of handling normal overload and abnormal torque. Both are protected in various ways and can be easily released in case of overload, resulting in a book that can be used quickly.

[Brief explanation of the drawing]

1 is a sectional view taken along the line 1--1 in FIG. 2 and shows a first preferred embodiment of the device according to the invention; FIG.
3 is an enlarged partial sectional view of a part of the device shown in FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. FIG. 6 is a view similar to FIG. 1 showing a third preferred embodiment of the present invention in a partially broken section; FIG. 6 is a view similar to FIG.
FIG. 7 is an enlarged partial view showing a modified example of a part of the structure of FIG. 6. 10... Hole punching device 12.14... Die 1
6... Workpiece 18... Cavity 20
．． 24.32... Hole 22.22'... Die tooth 26.26'... House sink 28... Shoulder 30... Shaft 34... Worm gear 36... Worm 38... Drive means 4
0...Coupling means 42...First portion 4 of coupling means
4...Second part of coupling means

Claims (5)

[Claims] (1) A first die and a second cooperating die are respectively attached to both sides of the workpiece, the first die and the workpiece each have a hole formed therein, and the first die and the workpiece are each formed with a hole. a housing that engages; a shaft that is supported within the housing, is inserted through the hole, and engages with the second die; a worm gear that is threadedly engaged with the shaft; and a worm that engages with the worm gear. and drive means having an electric drill and means for coupling the drill and the worm, and when the drive means is actuated, the second die is drawn towards the workpiece and the first die is drawn towards the workpiece.
The work piece is compressed between the die of the drill bit and the second die, and the first die and the second die work together to punch a hole in the work piece, and the coupling means includes the drill bit of the drill bit. A first part that is rotated by the worm, a second part that rotates together with the worm, and a second part that rotates together with the worm work together to rotate both parts at all times, but when overloaded, the second part rotates together with the worm. shearable means for shearing the first part so as to keep it stationary while the first part is rotated by a drill;
and a second portion is concentric, the first portion surrounding the second portion, and the second portion having a pair of holes formed on opposite sides thereof to facilitate engagement by a hand tool. Means having a flat portion is formed such that upon shearing action of the shearable means, the worm is rotated in the opposite direction using a hand tool to remove the device from the workpiece. A hole punching device featuring: (2) a patent further comprising handle means integral with the shaft, whereby the shaft can be manually rotated to rapidly engage the workpiece with the die prior to actuation of the drive means; A hole punching device according to claim 1. (3) further comprising a pair of pushes supported within the housing and mounted on opposite sides of the worm gear for resisting torque applied to the worm gear about an axis perpendicular to the axis of the worm gear; 3. A hole punching device as claimed in claim 2, wherein the gear and said shaft engage each other by thread means having a load-bearing surface substantially radial to the axis of the shaft. (4) The hole punching device according to claim 3, wherein the thread is of a saw blade type. (5) The hole punching device according to claim 3, wherein the thread is of an acme type.